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In demanding sectors like UV inkjet inks, microlithography photoresists, and electronic chemicals, standard additives often fall short. Formulators frequently struggle with critical issues such as post-thickening, ink gelation, development residue, and severe pigment agglomeration. To address these bottlenecks, SINOSIL delivers a portfolio of high-purity UV Inkjet dispersant, Photoresists Silicone-free Leveling Agent, Graphene Dispersion in NMP for Battery Pastes and Conductive Carbon Black Slurry Additives, engineered to solve complex formulation challenges—from nanoparticle stabilization to interfacial wetting—enabling the next generation of electronic and coating technologies.

UV Inkjet Dispersant: Nanoparticle Stabilization

Performance requirements for dispersant in UV inkjet ink significantly exceed those of traditional industrial coatings and inks. Beyond critical pigment color development and viscosity reduction efficiency, most demanding technical challenges include achieving long-term storage stability in solvent-free or low-monomer systems, ensuring reliable jetting performance without printhead clogging, and maintaining precise stabilization of nano-scale particle sizes. Currently, industry selection of suitable dispersant is highly specialized and limited, as many conventional chemistries are prone to post-thickening or catastrophic gelation during storage.

1. Dispersion Solutions for White Pigment Pastes: 9102P and 9213

To meet rigorous demands of Titanium Dioxide (TiO₂) dispersion in UV inkjet systems, SINOSIL offers two high-performance dispersant with specialized functional profiles:

9102P: A 100% active copolymer UV inkjet dispersant featuring acidic phosphate ester groups (Acid Value: 50-70 mg KOH/g). Engineered for broad compatibility, it delivers exceptional viscosity reduction across more than 90% of standard UV resin systems. In a benchmark formulation of 75% TiO₂ and 3% dispersant, 9102P achieved an initial viscosity of approximately 3,600 mPa·s. Following a 7-day accelerated heat-aging test at 50°C, viscosity remained stable below 4,000 mPa·s with zero thixotropy and consistent, smooth flow. Because its molecular structure is amine-free, it eliminates risk of yellowing after UV curing, making it the preferred solution for high-purity white pastes.
9213: A structured styrene-maleic anhydride (SMA) copolymer synthesized via controlled polymerization technology, act as UV inkjet dispersant. This 100% active dispersant incorporates both amine and carboxyl functionality, providing strong anchoring affinity for both organic and inorganic pigments. In identical TiO₂ test formulations, 9213 achieved even lower viscosity profiles (1,600 mPa·s initially, stabilizing at 1,800 mPa·s after heat aging). While its amine content is processed to minimize reactivity, a slight potential for yellowing exists; consequently, it is best utilized as a “universal” dispersant for integrated ink sets that include organic pigments and carbon black.
Particle Size Stability: Both dispersant consistently maintain TiO₂ particles at a D50 of approximately 200 nm, ensuring reliable jetting performance and meeting stringent particle size distribution requirements of UV inkjet.

2. Dispersion Solutions for Organic Pigments and Carbon Black: 9213

Primary technical challenge in dispersing organic pigments (such as PR254, PY150, PB15:3) and specialty carbon blacks (such as FW200) for UV inkjet applications is maintaining long-term viscosity stability and preventing gelation. SINOSIL evaluated performance of 9213 through rigorous 80°C water bath heat-storage testing:

Accelerated Aging Results: In black (FW200) and red pigment pastes, 9213 maintained a non-thixotropic, gel-free state with virtually no viscosity increase even after two weeks of storage at 80°C.
Competitive Performance Benchmark: In contrast, conventional polyurethane-based UV inkjet dispersant (such as 16 series) reached a complete gel state within only two days under identical thermal stress conditions.
Proven Reliability: These results confirm that controlled polymer architecture of 9213 effectively maintains pigment particles in a de-flocculated state under extreme conditions. This significantly enhances shelf-life and processing latitude of ink while delivering consistent color development, high gloss, and superior stability across diverse color palettes, including black, blue, and yellow.

Silicone-Free Photoresist Leveling Agent: Meeting Rigors of Semiconductor Processing

Photoresist manufacturing process involves several highly sophisticated stages—including coating, exposure, development, etching, and high-temperature curing—placing technical performance requirements on additives that far exceed those of industrial coatings. In strategic collaboration with key customers, SINOSIL engineered E0321 silicone-free leveling agent, a high-performance solution specifically designed to address following critical industry challenges:

Elimination of Development Residue: Various leveling agent can result in different degrees of residual film during development and cleaning phases. In rigorous comparative evaluations, E0321 demonstrates zero residue performance, ensuring absolute substrate cleanliness essential for downstream processing.
Optimized Surface Smoothness: Conventional leveling agent often fail to fully discharge micro-bubbles, leading to excessive surface roughness after cure. Through advanced molecular architecture, E0321 eliminates factors that stabilize foam, resulting in a perfectly uniform and planar surface (validated through high-resolution 45° and 90° microscopic imaging).
Prevention of Mura Defects: Thickness variations stemming from inadequate leveling often manifest as “whitening” or “Mura” defects during high-precision optical inspection. E0321 delivers superior leveling efficiency, effectively eliminating these coating irregularities.
Adhesion and Chemical Resistance: Maintains critical adhesion balance between photoresist and substrate. Furthermore, its performance properties remain stable even when subjected to aggressive developers and specialized cleaning agents.

Featuring 100% active content, E0321 is ideal leveling agent for PSPI (Photosensitive Polyimide) photoresist systems where exceptional cleanliness, surface uniformity, and broad processing latitude are mandatory.

UV Systems: Balancing Wetting, Leveling, and Defoaming

The high polarity and transparency requirements of UV resins make it difficult to find additives that do not cause haze or excessive foaming.

1. Low-Foaming Anti-Cratering Leveling Agent: 6013 & 6023

6013: A 100% active polyether-modified siloxane, act as UV leveling agent. It provides excellent substrate wetting and anti-cratering performance while significantly reducing foam stabilization tendencies. Testing in solvent-free UV systems demonstrates minimal micro-foam after high-speed dispersion, with total air release within 40 minutes, ensuring exceptional film transparency. Its anti-cratering capability outperforms conventional leveling agents, making it ideal for thin films and sensitive substrates.
6023: A 100% active acrylate-modified polysiloxane act as UV leveling agent. While structurally similar to 6013, it contains functional double bonds that participate in UV cross-linking. This ensures long-lasting surface slip and durability without compromising recoatability. While its anti-cratering strength is slightly lower than 6013, it is preferred solution for applications requiring permanent surface performance.

2. Universal High-Penetration Wetting Agent: 2405

2405 is a 100% active polyether-modified siloxane wetting agent engineered to resolve traditional trade-off between low surface tension and excessive foaming:

Ultra-Low Surface Tension: Reduces static surface tension to as low as 20.4 mN/m—approaching theoretical limit for silicone wetting agent—providing superior resistance to craters and edge-pulling.
Minimal Foaming Profile: Whether in aqueous, solvent-free UV, or solvent-borne systems, it exhibits ultra-low foam or even self-defoaming characteristics. This eliminates common surface defects such as “pinholes” or “dark bubbles” typically caused by stabilized foam in traditional wetting agent.
Superior Pore Penetration: Specifically optimized for wood coatings and open-pore finishes, it significantly enhances wetting into deep pores, effectively reducing caoting times.

3. High-Compatibility UV Defoamer: 5980

5980 is a 100% active, silicone free defoamer, provide following features for UV inkjet system:

Exceptional Compatibility: Maintains absolute clarity in varnishes and overprint coatings, making it ideal for high-transparency applications such as luxury packaging and silver/gold cardstock printing.
High-Efficiency De-aeration: Optimized for high-speed screen printing, it facilitates rapid air release to prevent foam-related defects caused by increased mechanical speeds.
Zero “Oil Spots”: As silicone free defoamer, it eliminates risk of craters, “fish-eyes,” or oil spots often associated with incompatible silicone defoamer.

New Energy: Graphene Dispersant in NMP, Acetylene Black Dispersant

Graphene Dispersant in NMP Systems: 9250

9250 is a 100% active high-molecular-weight copolymer functionalized with pigment-affinic groups. This additive is specifically engineered to optimize storage stability of graphene dispersions within N-Methyl-2-Pyrrolidone (NMP) solvent systems:

Exceptional Stability Profiles: In laboratory evaluations, a graphene slurry (approx. 4.5% solids content) dispersed with 9250 showed virtually no sedimentation after 7 days. Analysis revealed consistent solid levels between the top layer (4.53%) and the bottom layer (4.91%).
Performance Benchmark: In contrast, conventional dispersants (such as 9242) exhibited severe phase separation under identical conditions, with top layer solids dropping to 0.35% and bottom layer reaching 5.67%.
Broad Formulation Latitude: Leveraging its unique macromolecular architecture and multi-solvated segments, 9250 offers excellent versatility across aqueous, alcohol-based, and co-solvent systems. It is also highly effective in organic/inorganic co-grinding processes, delivering superior color consistency.

Aqueous Acetylene Black Dispersant: 9300

9300 is a 100% active polymeric dispersant developed to overcome significant technical hurdles associated with dispersing high-surface-area acetylene black:

Advanced Viscosity Control: In formulations featuring 20% acetylene black and 10% dispersant, 9300 delivers an ultra-low, water-thin viscosity profile while maintaining a foam-free state.
Proven Competitive Advantage: Comparative testing indicates that alternative chemistries—including polyether, styrene-maleic anhydride (SMA), polyurethane, and standard controlled polymerization types—fail to effectively stabilize acetylene black at these loading levels.
High-Pigment Loading Performance: 9300 is equally proficient in dispersing high-color carbon blacks (such as FW200). It maintains low viscosity even at 20% concentrations, providing manufacturers with enhanced color development, water resistance, and superior gloss.

Technical Support & External Resources

For further reading on chemical standards and additive technologies mentioned in this report, visit following professional resources:

Industrial Coating Defoamer Effective Selection Guide

Waterborne industrial coatings are clear choice for a greener future, but their diverse resin chemistries bring equally diverse foam challenges. Moving beyond generic selection by defoamer chemistry, we now match solutions directly to your resin system. Backed by advanced visualization and digital evaluation technologies, we provide targeted, high-performance coating defoamer strategies for major resin families.

One-Component Acrylic Coating

System Profile: Widely used in general metal protection and appliance finishes. Some high-water-resistance grades can be harder to defoam.
Core Coating Defoamer & Benefit:
- P401W: An highly effective deaerator for high-viscosity, hard-to-defoam emulsions. It rapidly eliminates microfoam with minimal impact on water resistance and gloss.
- 422 / 424: Medium-strength, concentrated defoamers offering good compatibility for standard emulsions.
- 437: An emulsion-type defoamer for the let-down stage, providing excellent bubble breaking and foam suppression.
Application Case: In a CR-3090 emulsion system, adding 0.2% P401W at grind combined with 437 achieved a bubble-free wet film thickness of 275 μm, with minimal gloss loss.

Two-Component Acrylic Polyurethane (2K PU) Coating

System Profile: Used in demanding applications like agricultural and construction equipment. Challenges include reaction bubbles during curing and high film build, where microfoam gets trapped.
Core Coating Defoamer & Advantage:
- P401W: Add at grind for powerful deaeration, inhibiting reaction bubble formation.
- 402W: A deaerator specialized in merging microfoam for rapid rise to the surface.
- 437: A fast bubble breaker for surface foam with outstanding foam suppression.
- 4222: A concentrated defoamer balancing efficiency and compatibility, ideal for systems sensitive to cratering.
Application Case: A hydroxy dispersion system using a combination of 4222 (grind), 402W, and 437 (let-down) achieved a 225 μm bubble-free wet film, high gloss, and excellent adhesion, outperforming single-defoamer solutions.

Water-Soluble Acrylic & Amino Baking Coating

System Profile: High-temperature bake finishes (140–180°C) requiring exceptional clarity, gloss, and intercoat adhesion. Silicone defoamers can fail at high temperatures, harming adhesion.
Core Coating Defoamer & Advantage:
- 432: A 100% active, silicone-free defoamer. Its novel polymer/hydrophobic particle synergy offers strong defoaming, excellent heat resistance (stable at 180°C), and no adhesion loss.
- 455: A highly compatible, silicone-free defoamer for ultra-high clarity applications like inks and thin films.
Application Case: In a water-soluble acrylic-amino bake system, 0.3% 432 delivered superior gloss (97.9/98.1 at 20°/60°) compared to the control, with no adhesion issues post-bake.

Polyurethane Dispersions (PUD)

System Profile: Used in plastic, leather, and textile coatings where supreme compatibility and clarity are critical. Some applications require a defoamer particle size <300 nm for filtration.
Core Coating Defoamer & Advantage:
- HOS 432: A compatible, silicone-free defoamer for the grind stage.
- 4343 / 455: Emulsion-type defoamers. 455 contains no hydrophobic particles for finer particle size, ideal for high-clarity systems and strict filtration.

Waterborne Epoxy Coating

System Profile: High-PVC primers and mid-coats with high viscosity and film build. Foam, especially trapped microfoam, severely impacts anti-corrosion performance.
Core Coating Defoamer & Benefit:
- P401W: Strong deaerator for grind stage.
- 402W + 437: A synergistic let-down combo. 402W tackles microfoam, 437 breaks surface foam, ensuring a dense, bubble-free film.
Application Case: In an epoxy system, the 402W + 437 combination completely eliminated subsurface and surface bubbles, as confirmed by cross-section analysis.

Waterborne Alkyd Coating

System Profile: Used in general metal protection; sensitive systems requiring defoamers with excellent compatibility.
Core Coating Defoamer & Benefit:
- 424: Concentrated defoamer for the grind stage.
- 435: Emulsion-type defoamer for the let-down stage, balancing defoaming and compatibility.

Gain deeper insights into the chemistry of waterborne coating formulations via the American Coatings Association

Overview

Polyurethane Modified Silicone Softener, Innovative Textile

Our Polyurethane Modified Silicone softener represents a significant advancement in the field of Textile Finishing Auxiliaries. By utilizing an advanced Silicone Polyurethane Copolymer architecture, these materials are designed to overcome the limitations of traditional silicones softener, engineered to deliver the soft, luxurious hand feel of silicone with the exceptional durability and resilience of polyurethane.

Unlike a standard Textile Softening Agent that merely coats the surface, our technology synergizes the mechanical strength of polyurethane with the lubricity of polysiloxane. This hybrid structure creates a robust, flexible network on the fiber surface, ensuring performance that lasts.

Key Features and Typical Benefits

Our solution is formulated to deliver competitive advantages for global textile manufacturers:

Superior Durability: As a premier Wash-resistant Fabric Softener, the specialized copolymer structure promotes strong surface anchoring. This ensures the hand-feel persists through repeated domestic laundering cycles, solving a industry common pain point.
Optimized Hydrophilicity: We have engineered this product as a Hydrophilic Silicone Oil alternative. It contains hydrophilic segments that maintain the natural water absorbency of the substrate, making it an ideal candidate for premium cottons and moisture-management activewear.
Non-Yellowing:: Functioning as a high-performance Non-yellowing Softener, it is engineered to resist thermal oxidation. This preserves the brilliance of white and pastel-colored fabrics even under high-temperature curing conditions.
Process Stability: The product is available as a stable Emulsified Silicone Softener. Its excellent shear and pH stability helps minimize the risk of silicone spots and roller build-up in high-turbulence dyeing jets and continuous padding lines.

Technical Focus: The Hybrid Advantage

The core of this innovation lies in its unique molecular design. Technically defined as a Block Copolymer Silicone, it integrates distinct functional blocks to achieve specific performance targets.

By leveraging Isocyanate Functional Silicone chemistry (in a latent, stable form), the polymer facilitates better adhesion to both natural and synthetic fibers during the drying process. This reactive capability distinguishes it from physical blends, providing a uniform film formation that enhances fabric tear strength and abrasion resistance without the typical greasy residue.

Potential Applications

These Polyurethane Modified Silicone technologies are versatile candidates for a wide range of textile substrates:

Cellulosic Fabrics: Cotton, rayon, and lyocell knits requiring a durable, soft touch without compromising absorbency.
Performance Synthetics: Polyester and nylon blends where stretch recovery and anti-static properties are critical.
Home Furnishings: Bed linens and towels that demand long-lasting bulk and a premium tactile experience.

Our product offering

SPU286 is a high-concentration polyurethane-modified silicone softener, which provides exceptional smoothness, softness, elasticity, and refreshing hand feel for textiles and offering durable wash-resistant performance.

SPUWDH is a hydrophilic high-concentration polyurethane-modified silicone softener, which delivers excellent hydrophilicity along with a skin-friendly hand feel characterized by fluffiness, fullness, softness, smoothness, and elasticity and ensuring long-lasting wash resistance.

SPU75H is a high-concentration in-bath polyurethane-modified silicone softener, which exhibits excellent hydrophilicity and high stability while imparting an ultra-soft, smooth, fine, and elastic hand feel with wash-resistant durability.

SPU800H is a high-concentration cooling polyurethane-modified silicone softener, which offers a strong cooling effect with high coolness value and good hydrophilicity, alongside a smooth, soft, fine, and elastic hand fee lwith wash-resistant durability.

SPU888 is a high-concentration polyurethane-modified silicone emulsion specifically formulated for synthetic fibers, which provides a fluffy, full, soft, cotton-like, and bouncy hand feel with wash-resistant durability.

Silicone Softeners and Softening Agents product line from SINOSIL includes softener flakes, amino silicone softeners (in emulsion and oil form) as well as block silicone softeners (in emulsion and oil form), read more about full-range line of SINOSIL TEXTILE SOFTENER

Overview

Silicone Antifoam and Defoamer Practical Guide

Introduction

What is Silicone Antifoam and Defoamer?

Silicone (polydimethylsiloxane，Ref. Wikipedia – Defoamer) has been used as an antifoam for more than 40 years and has been rapidly and extensively used in various fields since the 1980s. Silicone antifoam can effectively remove and suppress foam in the production process.

Antifoam VS defoamer

Even though we call them antifoam, they are used in two ways to help control foam in your system. When used as antifoam, they help prevent foam from developing. When used as defoamer, they help destroy or knock down foam after it has occurred.

silicone antifoams defoamer explain Defoaming way

Knockdown refers to the reduction in foam height that occurs when the antifoam is added. Speed of knock down is also important, so is persistence, the length of time the antifoam continues to perform. Different foaming situations require different degrees speed of knock-down, and persistence.

How to destroy foam?

Silicone antifoaming agent How silicone antifoam agents work?

Silicone has low surface and interfacial tensions (see Fig.1). This enables it to flow easily over the foam wall, and seeks out openings and occupies them, causing the wall to thin and collapse.

To effectively destroy foam, reducing surface tension is key. Silicone antifoaming agent work by lowering the surface tension of liquids, preventing bubbles from forming and enabling them to break apart more easily.

By dispersing smaller bubbles and inhibiting bubble growth, it prevent large foam formations. This ensures stable, long-lasting defoaming, vital in industrial processes where foam control is crucial.

These actions, including surface tension reduction and bubble dispersion, are essential to achieving effective foam destruction and ensuring consistent, high-quality results in various applications.

Surface tension of common liquid

Liquid surface tension	(mN/m)
Water	73
Alkyd resin	33 – 60
Butyl glycol ether	30
Toluene	29
Isopropyl alcohol	22
Octane	21
Trisiloxane	17
Hexamethylsiloxane	16

How to evaluate performance?

silicone antifoams Selecting the right silicone antifoam is crucial for optimizing coating performance, it plays an essential role in controlling foam, ensuring a smooth application and preventing defects.

Considered key characteristics included dispersibility, defoaming speed, and persistent foam suppression. These factors help balance efficiency, cost, and appearance, improving overall product quality.

In-depth evaluation of these traits will guide your selection process. Proper testing methods will ensure antifoam meet your specific needs, delivering superior performance in various applications. Below is 3 regular testing method:

Test method	Explain
Stirring test	Evaluation of efficiency and separation tendency of defoamer: Complete formulation (include defoamer) is stirred with toothed dissolver at high speed (e.g. 3 min at 4000 rpm), Determined by weight and get density of formulation. Repeat test after storage (e.g. 2 weeks at 50°C) and get defoaming efficiency.
Bubbling test	(see Fig.1) Add foaming liquid and defoaming agent into cylinder, keep it constant at set temperature, blow air into it at a set flow rate, and record change pattern of foam volume (including volume sum of foam and medium) over time.
Shake test	Add certain amount of foaming liquid in the cylinder with plug-in, each time under the same number of shake flask, static observation of foam height and defoaming time.

silicone antifoams Bubbling test

Chemistry and Type

Silicone based antifoam main active substance is polysiloxanes (see Fig. 1)

SINOSIL offer product in a variety of forms to meet the needs of a wide range of systems and applications. Below is regular type from us:

Fluids	use in non-aqueous systems. They are inert and not conducive to bacterial growth, available in a wide range of viscosities.
Compounds	Scontain a suspension of finely-powdered silica to enhance their defoaming efficiency and designed primarily for non-aqueous systems.
Emulsions	ideal for controlling foam in aqueous systems.
Dispersions	ideal for controlling foam in aqueous systems.
Powder	often used in dry products to help prevent foaming and liquids are added.

Dilute method

Silicone defoamer is often diluted to improve application ease, reduce viscosity, and enhance dispersion in foaming systems. Proper dilution(see Fig1: dilute process) ensures faster defoaming without damaging the agent’s effectiveness.

Below we will introduce the dilution method in two cases based on different use

Dilute method #1

Weigh silicone defoamers
Add water into antifoam, stir while adding water
Add an acrylic thickener
Add 20% NaOH solution until pH7-8
Add proper amount of fungicide and stir well

Dilute Method #2

Weigh water and silicone defoamers.
Add an acrylic thickener to water
Add 20% NaOH aqueous solution until pH7-8
Add the thickened water to the antifoam and stir
Add proper amount of fungicide and stir well

Benefit

Low surface tension

Highly surface-active with liquid surface tension values of approximately 20 mN/m, which means they tend to spread through the foam more quickly. Silicone defoamers prevent foam from occurring upstream and reduce it more quickly and efficiently when it does occur (known as the knockdown effect).

Stable

They are more resistant to chemical corrosion, temperature variations, and pH levels.

Lower dosage level

The quantities of silicone anti-foam products needed to achieve the required effects are much lower than other products and offer more durable lower surface tension, especially important in complex and long-lasting processes, which adds up to lower cost in use.

Less reactive

They are inert and less reactive, leading to fewer compatibility problems, therefore safer for people and the environment.

More persistent

Silicone defoamers also tend to be more persistent.

Selection guide

Defoamer section is crucial for effective foam control. Factors like form, content, and application scenario must be carefully evaluated.

In selecting the best type and quantity of silicone defoamer, each application must be assessed separately. lt therefore best to evaluate several antifoams in each system to determine the type and concentration needed to assure optimum results.

Application environment

End use of product containing the antifoam: Food contact / sensitive to de-wetting

Figure out working system temperature (high / low), pH value (high / neutral / low) and chemical nature of foaming system (aqueous / non-aqueous)

Industries and applications demand

Make clear of your foam control goal, need fast defoaming (eliminate foam quickly), long-lasting antifoaming control (durability)

The usage method

Antifoam will be direct use or use after dilute

Compatibility: Clear appearance /turbid formulation

Dosing accuracy: Concentration of antifoam

Process condition

Pumping or spraying;

Process equipment: low shear, high shear

Other requirement

Add silicone based defoamers in formulation or on-site

Performance affecting factors

Silicone defoamers play a crucial role in eliminating foam in various industries, but several factors affect their performance.

The effectiveness of a silicone defoamer is determined by multiple factors including chemical composition, molecular weight, and solvent choice. Temperature and pH are also key determinants. At higher temperatures, defoamer becomes more active, while pH imbalances can reduce its efficiency. Below is simple explain for each item:

Chemical Structure

Chemical structure of silicone defoamers will affect defoaming effect and antifoaming time. For example, silicone defoamers contain a special group, which affect hydrophilicity and hydrophobicity, and finally affect defoaming performance.

Molecular Weight

Typically, a larger molecular weight of silicone defoamer leads to better defoaming and antifoaming effects. However, if the molecular weight is excessively high, it can reduce defoamer’s dispersibility.

Solvent

The solvent affects dispersibility and stability of silicone defoamer. When the solvent is water, the defoamer exhibits better hydrophilicity, making it suitable for use in coatings and detergents. In contrast, if the solvent is organic, the dispersibility improves, making it more appropriate for surface coatings.

pH Value

If the pH level of materials like coatings or adhesives is too low or too high, it will affect defoamer’s performance. Therefore, it is important to understand the pH level of foaming system

Temperature

Normally, at higher temperatures, defoamers become more active, resulting in a faster defoaming speed. However, if the temperature is too high, the defoamer may degrade.

Concentration

If the concentration is too low, the defoaming effect will be insufficient; if the concentration is too high, shelling may occur.

Usage & application

Application	Technical requirement of silicone antifoam agents
Resin synthesis	stable; economical; easy to use foam control agents
Industrial cleaning	alkali-resistant; requires high defoaming efficiency; stable; compatible
Water treatment	fast defoaming; stable; easy to use
Metalworking fluid	good compatibility and durability; anti-filter filtration
Pulping	alkali & high temperature resistant; adaptable to different pulp types (softwood/hardwood)
Textile printing and dyeing	good compatibility; stable; high temperature resistant
Acrylic emulsion system	good compatibility, no other adverse effects
Latex system	excellent dispersibility and compatibility
Food and beverage processing	safe; efficient; in line with food regulations in China and other countries and regions

silicone antifoams agent

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Defoamer for Coating & Paint

Overview

Silane Coupling Agents Practical Guide

Silane Coupling Agents Practical Guide

Fundamental Chemistry and Mechanism

What is Silane Coupling Agents

Silane Coupling Agents (SCA) is an organosilane compound featuring two key reactive groups: an organofunctional group (R) and a hydrolyzable group (X) bonded to a silicon atom (Si). Its general structure is R-Si-(X)₃. The hydrolyzable group, often an alkoxy group like methoxy or ethoxy, reacts with moisture to produce silanol groups (Si-OH). These silanol groups then bond with hydroxyl groups on the surface of inorganic materials, such as glass, silica, or metal oxides, forming stable siloxane bonds (Si-O-Substrate).

The organofunctional group (R) is specifically designed to interact with or blend into the organic polymer matrix, such as epoxy, polyester, or rubber. This dual reactivity establishes a strong chemical connection—the “coupling”—between the two different materials. This mechanism is essential for enhancing interfacial adhesion and improving overall material performance.

Functions and benefits in composites

Silane Coupling Agents primarily enhance the bond between inorganic fillers or reinforcements and organic polymer matrices. (Ref. Silane coupling agents used for natural fiber/polymer composites: A review – ResearchGate) This stronger adhesion leads to several key advantages for the final composite material:

Benefit	Description	Industrial
Enhanced Mechanical Properties	Significant increase in tensile strength, flexural strength, and impact resistance.	Allows for lighter, stronger materials in automotive and aerospace applications.
Improved Electrical Properties	Reduction in dielectric constant and dissipation factor, especially under wet conditions.	Essential for high-performance electronic encapsulation and insulation.
Increased Hydrolytic Stability	The stable siloxane bond prevents water from penetrating and weakening the interface.	Extends the service life of materials exposed to high humidity or water.
Better Dispersion	SCAs can modify the surface energy of fillers, leading to better dispersion in the polymer.	Results in a more homogeneous composite with predictable performance.

Ref. A Guide to Silane Solutions: Adhesives and Sealants – AZoM

Difference vs adhesion promoter

Silane Coupling Agents (SCAs) act as adhesion promoters, but the term specifically refers to a unique category of organosilane compounds that enhance adhesion through a distinct chemical bridging process. Other adhesion promoters include a wider variety of substances, such as titanates, zirconates, or various primers, which often depend on physical entanglement, hydrogen bonding, or simple acid-base interactions.

The main difference is that SCAs create a covalent bond between inorganic and organic materials, offering a level of durability and hydrolytic stability that most other adhesion promoters cannot match

Structure and performance

Effectiveness of a Silane Coupling Agents largely depends on its molecular structure, particularly the type of organofunctional group (R) and the length of the alkyl chain (linker) that connects it to the silicon atom.

Organofunctional Group (R): This group must be chemically compatible with the polymer matrix. For instance, an epoxy-functional silane, such as γ-glycidoxypropyltrimethoxysilane, works well with epoxy resins. In contrast, an amino-functional silane, like γ-aminopropyltriethoxysilane, is better suited for polyurethanes or phenolic materials. Using an incompatible functional group can lead to poor coupling efficiency.
Linker Length: The length of the alkyl chain between the silicon atom and the organofunctional group affects the molecule’s flexibility and mobility at the interface. Longer, more flexible linkers can enhance stress relaxation and durability, while shorter linkers tend to provide greater rigidity.

Selection, Application, and Process

Selection guide

Choosing the right Silane Coupling Agents is essential for formulating composites. This selection process mainly involves aligning the organofunctional group of the silane with the chemistry of the polymer matrix.

Polymer Matrix	Recommended Silane Functional Group	Example SCA
Epoxy, Phenolic, Polyimide	Epoxy, Amino	Glycidoxypropyltrimethoxysilane (GPTMS)
Unsaturated Polyester, Vinyl Ester	Methacrylate, Vinyl	Methacryloxypropyltrimethoxysilane (MPTMS)
Polyurethane, Nylon, Acrylic	Amino	Aminopropyltriethoxysilane (APTES)
Polyolefins (PE, PP)	Vinyl, Mercapto	Vinyltrimethoxysilane (VTMS)

Application areas

Silane Coupling Agents play an important role in nearly every sector of chemical and materials industry, especially when bonding different materials for optimal performance. Here are some key application areas:

Composites: These agents treat glass fibers, carbon fibers, and mineral fillers in reinforced plastics, making them essential for the automotive, construction, and wind energy sectors.
Coatings and Paints: They enhance adhesion, corrosion resistance, and scratch resistance on metal and glass surfaces.
Adhesives and Sealants: Silane Coupling Agents improve bond strength and durability, especially in moisture-cured systems.
Rubber and Tire Industry: They treat silica and clay fillers to enhance abrasion resistance and lower rolling resistance.
Electronics: These agents are used in encapsulation and potting compounds to provide moisture protection and ensure thermal stability.

Process condition

To effectively treat inorganic fillers with a Silane Coupling Agent, it is crucial to manage several key factors:

Filler Surface Chemistry: The filler should have enough surface hydroxyl groups (such as those found in SiO₂ and Al₂O₃) to allow for a reaction with the silanol groups.
Moisture Content: Water plays a vital role in the hydrolysis of the silane. Insufficient water can hinder hydrolysis, while excessive water may cause the silane to self-condense, resulting in oligomers that are less effective.
pH of the Solution: Hydrolysis is typically accelerated by either an acid or a base. Maintaining an optimal pH (generally between 4 and 5 for most silanes) promotes quick and complete hydrolysis without premature condensation.
Concentration and Coverage: The Silane Coupling Agent should be applied in a quantity sufficient to create a monolayer on the filler surface. Over-application can waste resources and negatively affect mechanical properties

Application method

Application method for a Silane Coupling Agent depends on the type of inorganic substrate—whether it’s a filler, fiber, or surface—and the final manufacturing process.

Application Method	Description	Column 3	Column 4
Solution Treatment (Wet)	Substrate is dipped or sprayed with a dilute aqueous or organic solution of the hydrolyzed silane.	Fibers, large surfaces, pre-treatment of fillers.	Consistent coverage with highly effective coupling.
Dry Blending	Liquid silane is sprayed directly onto the filler powder during high-speed mixing.	Fine particulate fillers (e.g., silica, clay).	Cost-effective, single-step process, minimal solvent use.
In-Situ Addition	silane is added directly to the polymer/filler mixture during compounding.	Fillers in thermoset or thermoplastic processing.	Simplifies manufacturing, but requires high shear mixing.

Used with natural fibers or bio-based polymers

Silane coupling agents are becoming more popular for treating natural fibers, such as wood flour, hemp, and jute, to improve the performance of bio-based polymers. Natural fibers tend to absorb water, making them incompatible with hydrophobic polymer matrices and resulting in low hydrolytic stability. By applying silane treatment, we can decrease the fiber’s water affinity and create strong chemical bonds with the polymer. This process significantly enhances the mechanical properties and water resistance of the resulting bio-composites

Concentrations and dosages

Dosage of a Silane Coupling Agents depend on the surface area of inorganic substrate. For most mineral fillers and glass fibers, recommended dosage is between 0.5% and 2.0% by weight of filler. This amount typically creates a complete monolayer on the filler surface. Using less than this optimal range may lead to incomplete coverage and weak bonding. Conversely, applying too much can create a weak layer of unreacted silane oligomers, which can diminish mechanical strength

Technical Performance and Stability

Improve the hydrolytic stability and mechanical properties

One of key advantages of using a Silane Coupling Agents (SCA) is the enhancement of hydrolytic stability. Water molecules are small enough to infiltrate the interface between untreated inorganic fillers and polymers, which can cause the polymer to separate from the filler. SCAs address this issue by creating strong, water-resistant siloxane bonds (Si-O-Si) with the inorganic surface. These covalent bonds are significantly more durable than the weaker secondary forces, such as van der Waals or hydrogen bonds, that typically govern adhesion in untreated systems.

By shielding the interface from water intrusion, SCAs help maintain the material’s integrity. This protection ensures that mechanical properties remain stable, even after extended exposure to high humidity or immersion in water.

Affecting factors

Moisture is a double-edged sword for Silane Coupling Agents. It is absolutely necessary for the initial hydrolysis step, which converts the alkoxy groups to reactive silanol groups. However, high humidity or excessive moisture during the curing or service life of the final product can be detrimental.

During Application: Controlled humidity is required for proper silanol formation and subsequent condensation.
During Service: While the siloxane bond is highly hydrolytically stable, prolonged exposure to hot, wet conditions can still lead to slow degradation of the interface. This is why the choice of the organofunctional group and the density of the silane layer are crucial for long-term durability.

Safety, handling, and storage

Silane Coupling Agents are specialized chemicals that require careful handling. Most SCAs are liquids and are classified as irritants, and some are flammable. Key guidelines include:

Ventilation: SCAs, particularly those with methoxy groups, release methanol upon hydrolysis, which requires adequate ventilation.
Personal Protective Equipment (PPE): Always use appropriate gloves, eye protection, and protective clothing.
Storage: SCAs are sensitive to moisture and heat. They must be stored in tightly sealed containers in a cool, dry, and well-ventilated area to prevent premature hydrolysis and polymerization.
Disposal: Follow local regulations for the disposal of organosilane compounds and their byproducts. Always consult the product’s Safety Data Sheet (SDS) for specific instructions

Silane Coupling Agent Manufacture Top10 in China

Top 10 Silane Coupling Agent Manufacture in China

Silane coupling agents play a crucial role in enhancing adhesion between organic and inorganic materials, making them essential in various industries, including coatings, adhesives, and composites.

China is home to several leading silane coupling agent manufacture, known for their innovation and production capacity. Below is a list of the top 10 silane coupling agent manufacture in China.

Dow Chemical

Overview: DOWSIL is a brand under The Dow Chemical Company, which was formerly known as Dow Corning. It is a global leader in silicone technology and innovation, merging the strengths of both Dow and Dow Corning to enhance its silicone products and solutions across various industries.

Established: The brand was officially launched in 2018, following Dow’s acquisition of Dow Corning in 2016.

Location: DOWSIL operates globally, with numerous manufacturing bases across various countries.

Main Products: Silicone sealants, Adhesives, Coatings, Elastomers, Specialty fluids

Wacker Chemical

Overview: Founded in 1914, WACKER is a renowned German company specializing in organic silicone sealants and other specialty chemicals. It has established itself as a leader in the silicone and ethylene chemistry sectors.

Established: 1914

Location:Headquartered in Munich, Germany, with over 20 production sites worldwide.

Main Products: Silicone products (sealants, adhesives), Polysilicon for solar cells, Binders for construction materials, Specialty polymers

Hubei Jianghan New Materials Co., Ltd

Overview: Established in 1998, Jianghan New Materials focuses on the research, development, production, and sales of functional organosilanes and other silicon-based new materials. The company went public in 2023.

Established: 1998

Location: Headquartered in China, with operations that include research and manufacturing facilities.

Main Products: Functional organosilanes, Silane coupling agents, Silicon-based new materials

Jiangxi Chenguang New Materials Co., Ltd.

Overview: Founded in 2001, Chenguang specializes in functional silane raw materials and intermediates. The company went public on the Shanghai Stock Exchange in 2020, becoming one of the largest manufacturers of organosilane coupling agents in China.

Established: 2001

Location: Based in China, with a comprehensive production facility.

Main Products: Functional silanes, Silane coupling agents, Intermediate chemicals for various applications

Jiangxi Hungpai New Materials Co., Ltd.

Overview: Established in 2005, Hungpai focuses on functional silanes and nanomaterials. The company is listed on the stock exchange and is recognized for its contributions to the circular economy within the functional silane sector.

Established: 2005

Location: Headquartered in Jingdezhen, Jiangxi Province, China, with multiple subsidiaries across regions.

Products:Functional silanes, Nanomaterials, Specialty chemicals for automotive and construction industries

Momentive Performance Materials

Overview: Originating from the U.S. in 1938, MOMENTIVE is known for its high-performance silicone products. It was previously part of GE-Toshiba before becoming an independent entity.

Established: 1938

Location: Headquartered in the United States, with a global presence.

Main Products: Silicone sealants, Specialty coatings, High-tech materials for various applications

Evonik Industries

Overview: EVONIK, formerly Degussa, is a leading specialty chemicals company from Germany that operates globally across several sectors including additives and smart materials.

Established: Originally established as Degussa in 2000, rebranded to EVONIK later.

Location: Headquartered in Essen, Germany, with over ten production sites in China alone.

Main Products: Specialty additives, Functional materials, Nutrition products

Tangshan Sunfar Silicon Industries Co., Ltd.

Overview: SUNFAR is a subsidiary of Sunfar Co., Ltd., specializing in organic silicon new materials and fine chemical products. It focuses on R&D, production, and sales of silane coupling agents.

Established: Listed as part of Sunfar Co., Ltd., which has been operational since its founding date around the early 2000s.

Location: Based in China, with extensive manufacturing capabilities.

Main Products: Silane coupling agents, Organic silicon products for various industries

Shin-Etsu Chemical

Overview: Established in 1926, Shin-Etsu is a leading Japanese supplier of high-tech materials, particularly known for its extensive range of silicone products used globally across multiple industries.

Established: 1926

Location: Headquartered in Japan, with production facilities worldwide.

Main Products: Silicone , Semiconductor materials, Chemical solutions for various industrial

HUBEI BLUESKY NEW MATERIAL INC.

Overview: Founded in 1999, New Blue Sky specializes in functional silane product development, production, and sales. It has become one of China’s leading companies in this field with significant production capacity.

Established: 1999

Location: Based in China with extensive manufacturing operations.

Main Products: Silane crosslinking agents, Coupling agents, Various silanes and derivatives

Unveiling the New Face: A Journey of Innovation and Growth

Moment of transformation

We are proud to announce our rebranding as SINOSIL, jointly incorporated sales office by manufacturer, a change that reflects our dedication to innovation, growth, and an unwavering commitment to excellence.

As SINOSIL, we are excited to embark on this new chapter. It signifies our commitment to a future of possibilities and achievements. Thank you for being part of our story.

Water Oil Repellent Agent | C6 Fluoropolymer

Water Oil Repellent Agent | C6 Fluoropolymer

Water oil repellent agent C6 is alternative short-china C6 PFC versus long chain C8 PFC, providing sustainable alternatives for many applications, including textiles, leathers based on proven C6 chemistry. Chevell offers high performance properties with improved environmental and biological profiles.

What is C6?

C6 fluorinated polymers are proven safe for their intended use.
C6 fluoropolymer cannot break down to form PFOA or PFOS.
Innovative C6 WOR technology, excellent water oil repellency
Full product range to meet all performance demands.

Benefits: Chevell, the industry brand leader for valuable-performance barrier agents, performs listed below

Water repellency
Oil and grease repellency
Alcohol resistance
Soil resistance
Easy to clean property

Water Oil Repellent Agent | C6 Fluoropolymer 46

Water Oil Repellent Agent | C6 Fluoropolymer 47

Application

Industrial Workwear

Fluorine water oil repellent agent C6 from Chevell is ideal for tough and durable coatings for workwear in contact with oil and dirt such as in the automotive and chemical industries. Fabrics made using Chevell’s C6 repellent products are comfortable to wear and highly durable for industrial laundering.

Outdoor Leisure and Sportswear

Chevell fluorinated C6 water oil repellent provides a waterproof coating for outerwear and footwear designed for activities such as skiing, rambling, mountaineering and sailing. These waterproof characteristics mean it is widely used on tents, awnings and canopies to give protection from the elements.

Medical, Emergency Services

Chevell fluoropolymer C6 water oil repellent is suitable for use on surgical gowns, medical drapes, packs, protective masks in the medical industry.

As the industry leader, Chevell provdie multiple grades of both non-fluorinated and fluorinated( C8, C6 ) water oil repellent that provide excellent water and oil repellency to a variety of surfaces.

Through our well-developed polymer design and polymerization technology along with our comprehensive knowledge of water and oil repellency, our products excel in the marketplace.

Water Oil Repellent Agent | C6 Fluoropolymer 48

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Water oil repellent finishing agent market trend

Silicone Solutions… Boundless Possibilities

What were trends shaping fabric water repellent market?

The fabric water repellent market is experiencing dynamic shifts. Innovations in Water oil repellent finishing agent are paving the way for sustainable and highly functional textiles.

Water oil repellent finishing agent technologies are evolving to meet demands for durability and environmental consciousness. These solutions enhance fabric protection without compromising breathability or comfort.

Advancements in formulation processes are making these agents more efficient, providing better performance against stains, moisture, and oils. The drive towards eco-friendly options also ensures that the future of fabric treatment remains both functional and sustainable.

Water oil repellent finishing agent market trend 53

Sustainable and Eco-Friendly water repellent finishing

There was a growing demand for eco-friendly and sustainable textile water oil repellent finishing agent.

Advanced Technologies of water repellent finishing

Advancements in nanotechnology and polymer science were driving the development of more effective and durable water repellent treatments. Innovations such as superhydrophobic coatings were gaining attention for their ability to create extremely water-repellent surfaces.

Application Specific water repellent finishing agent

The market was witnessing a trend towards fabric water repellents designed for specific applications. For example, Water and Oil repellent tailored for outdoor gear, sportswear, or industrial applications, each optimized for the unique requirements of those use cases.

Durable Water Repellency (DWR) in Apparel

In the apparel industry, there was a focus on durable water repellency (DWR) technologies that could withstand repeated wash cycles. Brands were looking for solutions that provided long-lasting water resistance without compromising the breathability and comfort of fabrics.

Multifunctional Finishes

Fabric treatments with multifunctional properties, such as stain resistance, UV protection, and antimicrobial features in addition to water repellency, were gaining popularity. This trend was driven by the desire for versatile and high-performance fabrics.

Growth in Outdoor and Sports

The outdoor and sports industries were significant consumers of water repellent fabrics. With an increasing focus on outdoor activities and sports, there was a corresponding rise in the demand for fabrics that could withstand various weather conditions.

SinoSil, an repellent supplier of choice

As the industry leader, SINOSIL provides multiple grades of both non-fluorinated and fluorinated( C8, C6 ) products that give excellent water and oil repellency to a variety of surfaces.
Through our well-developed polymer design and polymerization technology along with our comprehensive knowledge of water and oil repellency, our products excel in the marketplace!

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How to Improve Textile Finishing Efficiency?

Silicone softeners are a crucial component in textile finishing, enhancing the softness and durability of fabrics. To fully grasp the significance of maximizing efficiency in silicone softener application, it’s essential to understand the fundamentals of these products and how they work.

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What is the Mechanism of Silicone Softener?

The mechanism behind silicone softeners lies in their molecular structure. Silicone softeners are composed of silicone-based polymers, which have a unique ability to form a lubricating film on the surface of the fabric fibers. This film reduces the friction between fibers, resulting in a smoother, softer texture.

What Makes Fabric Softener Work?

Fabric softeners, including silicone softeners, work by altering the surface properties of textile fibers. They reduce the friction between fibers, making the fabric feel smoother and softer to the touch. Additionally, fabric softeners can improve the drape and overall comfort of the textile.

What Makes Silicone More Flexible?

Silicone’s flexibility stems from its molecular structure, characterized by the presence of silicon-oxygen (Si-O) bonds. These bonds allow for flexibility while maintaining the stability and durability of the material. In silicone softeners, this flexibility is harnessed to create a soft and pliable feel on textiles.

What is the Mechanism of Softening Effect?

The softening effect of silicone-based softeners primarily occurs through the formation of a micro-thin film on the fabric’s surface. This film reduces inter-fiber friction, resulting in improved softness and flexibility. The silicone softener molecules align themselves on the fabric’s fibers, creating a lubricating layer that imparts a soft hand feel.

In conclusion, understanding the application and mechanism of silicone softeners is essential for textile manufacturers aiming to maximize efficiency in their usage. By selecting the right silicone softener, optimizing dosage, and implementing efficient application methods, manufacturers can achieve consistent, high-quality results in textile finishing. Additionally, knowledge of the underlying science behind silicone softeners can aid in product selection and process improvement.

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About novell

1. Dispersion Solutions for White Pigment Pastes: 9102P and 9213

2. Dispersion Solutions for Organic Pigments and Carbon Black: 9213

1. Low-Foaming Anti-Cratering Leveling Agent: 6013 & 6023

2. Universal High-Penetration Wetting Agent: 2405

3. High-Compatibility UV Defoamer: 5980

Graphene Dispersant in NMP Systems: 9250

Aqueous Acetylene Black Dispersant: 9300

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Top 10 Silane Coupling Agent Manufacture in China

Silane coupling agents play a crucial role in enhancing adhesion between organic and inorganic materials, making them essential in various industries, including coatings, adhesives, and composites.

China is home to several leading silane coupling agent manufacture, known for their innovation and production capacity. Below is a list of the top 10 silane coupling agent manufacture in China.

Dow Chemical

Wacker Chemical

Hubei Jianghan New Materials Co., Ltd

Jiangxi Chenguang New Materials Co., Ltd.

Jiangxi Hungpai New Materials Co., Ltd.

Momentive Performance Materials

Evonik Industries

Tangshan Sunfar Silicon Industries Co., Ltd.

Shin-Etsu Chemical

HUBEI BLUESKY NEW MATERIAL INC.

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