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How to choose a food antifoaming agent correctly?
Release Date:
2020-12-15
Bubbles inevitably form to varying degrees during both the production and application of coatings. These bubbles can hinder smooth manufacturing and application processes, while also introducing defects into the finished coating film. According to defoamer manufacturers, selecting the appropriate defoamer correctly ensures the seamless execution of both coating production and application.
Bubbles form to varying degrees during both the production and application of coatings; the formation of these bubbles… Food antifoaming agent It impedes the smooth progress of production and construction, while also introducing defects into the coating film of the finished product. Defoamer manufacturer We would like to inform you that selecting the appropriate defoamer can ensure the smooth operation of both coating production and application.
The function of a defoamer is to disrupt the liquid film on the bubble surface, inhibit bubble formation, and promote bubble rupture. Defoamers are used for large bubbles; for microbubbles, degassing and defoaming should be employed in combination.
Defoamer characteristics: The defoamer is insoluble in the medium but can enter and disperse within it in the form of microdroplets; the effective diameter of these defoaming droplets is comparable to the thickness of the foam wall.
Defoamer composition: Defoamers for water-based architectural coatings are classified into non-silicone and silicone-containing types. Conventional defoamers consist of the following components:
Active ingredients: They exert defoaming and antifoaming effects and possess low surface tension. Representative substances include vegetable and animal oils, hydrophobic silica, and higher alcohols.
Defoaming agents: wetting emulsifiers that ensure the defoaming microdroplets come into contact with and spread across the bubble film. Examples include nonylphenol polyoxyethylene ethers and soap salts.
Carrier: It facilitates the interaction between active ingredients and the foaming system, enabling easy dispersion within the foam‑forming medium. Non‑silicone defoamers bridge this relationship; with their inherently low surface tension, they effectively suppress foam while also helping to reduce costs.
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