I. Requirements for defoamer in coating production: (1) It has a certain affinity with the active substance on the surface of the foam, but it should be insoluble and insoluble in the bubble liquid; (2) The surface tension is lower than the surface tension of the bubble solution, and has a lower HLB value; (3) The emulsion (latex) should be stable; (4) The coating film can not cause the adverse consequences of fisheye and shrinkage; (5) Water-based coatings with defoamer: the use of insoluble substances in water, such as mineral oil, advanced alcohol, silicone resin, silicone is the best water-based coatings defoamer. Non-water-based coating defoamer: commonly used substances that are insoluble in organic solvents, such as low alcohols and silicone resins (the amount of silicone resin should be appropriate, excessive is easy to shrink and crack, and more modified silicone resins or emulsified silicone resins are used) II. Silicone defoamer recommended for water-based coatings: (1) Silicone oil, hydrophobic SiO2 mixture is suitable for: epoxy resin, pouring coating, dosage 0.3%; Thermoplastic acrylic resin, sprayed, dosage 0.3% (2) Polyether polysiloxane and hydrophobic SiO2 mixture is suitable for thermosetting alkyd resin, dipping amount 0.3%, scraping amount 0.1% (3) The mixture of hydrophobic SiO2, hydrocarbons, silicone oil is suitable for: thermoplastic acrylic resin, printing, ink, the amount of 0.1%; Air-dried acrylic resin, poured, dosage 0.5%. (4) Silicone oil and hydrophobic SiO2 mixture emulsion is suitable for: alkyd modified styrene acrylic resin, poured and coated, the amount of 0.5%.

Self-adhesive Liquid Silicone Rubber, plz check MY M3070