How to evaluate antifoam performance?
Selecting the right antifoam is crucial for optimizing coating performance. Silicone antifoams plays an essential role in controlling foam, ensuring a smooth application and preventing defects.
When choosing Silicone antifoams, consider key characteristics like 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 the silicone antifoams 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. |
Fig. 1: Bubbling test
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