Denkov ND like silica fine particles are added dimethyl silicone oil, silicone grease type defoamer through chemical treatment, antifoam effect. Goldschm. Ift. AG developed a variety of polyether-modified silicone defoamer for aqueous systems, good compatibility, excellent defoaming suds suppressing properties. Often penetration Ru [24], etc. chloroplatinic acid as catalyst to hydrogen silicone oil, polyether-terminal allyl F6 is synthesized from polyether-modified silicone oil (PMS). It with methyl silicone oil, white carbon compound, to obtain a narrow distribution, small particle size spherical particles defoamer. The emulsion does not float at different pH values (2 to 13), high temperature oil, non-hierarchical, but also to maintain strong suds suppressing activity, anti-foaming characteristics. Sun Jiang et chloroplatinic acid as catalyst with allyl polyethers and silicone oil (PHMS), obtained by reacting a polyether modified silicone oil (PMS), and then formulated with silicone antifoam emulsion dimethicone (PDMS) emulsion. Studies show that: the amount of the emulsifier to oil 5%, HLB value of 8, m (polyether) :m (PHMS) = 0.56, prepared silicone antifoam still under severe conditions of a strong base, high temperature maintaining excellent defoaming performance. Xiao Huang et fumed silica with 580 mPa · s and a dimethyl silicone oil (mass ratio 1:12.5) paste made of silicon at a temperature of 150 deg.] C, was added Tween 80-Span 80 emulsifier, viscosity A silicone oil, polyvinyl alcohol and water [m (water) :m (polyvinyl alcohol) = 10] to prepare a novel silicone defoamer. Temperature control 71/92 45 ℃, emulsifier HLB value of 10, the reaction time is about 1 h; prepared silicone antifoam antifoaming bubble suppressing effect is remarkable, suds suppressors time is 253 ~ 312 s, elimination soak time of 26 ~ 30 s. Silicone-based defoaming agent is very low surface tension, excellent defoaming and foam suppression capabilities, small effect on the gloss coating, but not the time, will produce poor recoatability, coating shrinkage and other ills [27-28] . Security while reducing the adjustment of defoaming performance silicone component coating defect and recoat disorders; improved compatibility, performance expand the application of different systems; compounded with other types of such an antifoaming agent is an antifoaming direction of development.