How Silicone Defoamer is Used in Paint Ink


Requirements for Defoamers in paint production:


It has a certain affinity with the active material on the foam surface, but it should be insoluble and insoluble in the bubble liquid.


The surface tension is lower than the surface tension of bubbles and has a lower HLB value.


Latex (latex) should be stabilized.


Coatings after film formation can not cause adverse consequences of fish eye and shrinkage.


Defoamer for waterborne coatings: The most insoluble substances in water, such as mineral oil, higher alcohols, silicone resin, silicone is the best defoamer for waterborne coatings. Defoamer for non-waterborne coatings: commonly used substances that are difficult to dissolve in organic solvents, such as lower alcohols and organosilicon resins (organosilicon resins should be used in an appropriate amount, excessive shrinkage cracking, pitting, now mostly modified organosilicon resins or emulsified organosilicon resins).


Silicone defoamer recommended for waterborne coatings:


The mixture of silicone oil and hydrophobic SiO 2 is suitable for: epoxy resin, casting, dosage 0.3%; thermoplastic acrylic resin, spraying, dosage 0.3%.


The mixture of polyether polysiloxane and hydrophobic SiO 2 is suitable: thermosetting alkyd resin, dipping amount 0.3%, scraping amount 0.1%.


The mixture of hydrophobic SiO 2, hydrocarbons and silicone oil is suitable for: thermoplastic acrylic resin, printing ink, 0.1% dosage; air-dried acrylic resin, casting, 0.5% dosage.


Silicone oil and hydrophobic SiO2 mixture emulsion: Alkyd Modified Styrene Acrylic resin, pouring, the amount of 0.5%.
From Silicone Public