Denkov N. D.等将细小的白炭黑粒子加入二甲基硅油中，经过化学

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. <br>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. <br>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.

Denkov N. D. and so on add small white carbon black particles to the dimethyl silicone oil, after chemical treatment of silicon elido-type defoaming agent, the effect of the suppression of the bubble is obvious. Goldschm. ift. AG developed a variety of polyether modified silicone defoaming agents, used in water-based systems, good compatibility, good anti-foaming performance. Regular Confucian , such as chlorpyrifos acid as a catalyst, with hydrogen-containing silicone oil, end-ene propylene-based polyether F6 as raw material, synthesis of polyether modified silicone oil (PMS). It is compounded with methyl silicone oil, white carbon black and so on, and is produced with a narrow distribution range, small particle size, spherical particle defoaming agent. The emulsion in different pH (2 to 13), high temperature conditions do not drift oil, do not layer, but also maintain the strong anti-foaming activity, fast-reducing characteristics.<br>Sun Jiang and other acrylic acid as a catalyst with olepropylene polyether and hydrogen silicone oil (PHMS), the reaction can be polyether modified silicone oil (PMS), and then with emulsified dimethyl silicone oil (PDMS) formulated silicone defoaming agent emulsion emulsion. The results show that the amount of emulsifier is 5% of the oil, the HLB value is 8, m (polyether) : m (PHMS) s 0.56, the silicone defoamer can still maintain excellent defoaming performance under the harsh conditions such as strong alkali, high temperature and so on. Yellow jaundice and other gas-like white charcoal black and with 580 mPa s dimethyl silicone oil (quality ratio of 1: 12.5) in the temperature of 150 degrees C to make a silicon emulsion, and then add Tween 80-Span 80 composite emulsifier, viscosity methyl silicone oil, polyethylene alcohol and water (m (water) m (polyvinyl alcohol) 10:1) to make a new silicone defoamer. The drip temperature is controlled at 45 degrees C, the HLB value of the compound emulsifier is 10, the reaction time is about 1 h, and the foaming effect of the silicone defoaming agent is significant, the foaming time is 253 to 312 s, and the defoaming time is 26 to 30 s.<br>Silicone defoaming agent surface tension is very low, excellent defoaming and anti-foaming ability, the gloss effect on the coating film is very small, but the use of the wrong time, will produce poor re-coating, coating film shrink hole and other ills . Adjusting the silicone composition to ensure the defoaming performance while reducing the defects and re-coating obstacles, improving compatibility, expanding the application performance of different systems, and compounding with other types of defoaming agents is the development direction of this type of defoaming agent.

Denkov n. D. et al. Added fine silica particles into dimethylsilicone oil, the defoaming effect of silicone grease defoamer after chemical treatment was obvious. Goldschm. IFT. AG has developed a variety of polyether modified organosilicon defoamers, which are used in water-based systems with good compatibility and excellent defoaming and antifoaming properties. Chang Guanru et al. [24] synthesized polyether modified silicone oil (PMS) with chloroplatinic acid as catalyst, using hydrosilicone oil and allyl terminated polyether F6 as raw materials. The defoamer with narrow distribution, small particle size and spherical particles was prepared by compounding it with methyl silicone oil and white carbon black. The emulsion does not bleach oil at different pH (2~13) and high temperature conditions. It can also maintain the characteristics of strong antifoaming activity and fast defoaming.<br>Polyvinyl ether modified silicone oil (PMS) was reacted with chloroplateic acid as catalyst using allyl polyether and hydrogenated silicone oil (PHMS) as catalyst by Sun Jiang. Then silicone defoamer emulsion was prepared with emulsified two methyl silicone oil (PDMS). The results show that the amount of emulsifier is 5% of oil, the HLB value is 8, m (polyether): m (PHMS) = 0.56, and the silicone defoamer can still maintain excellent defoamer performance under the harsh conditions of strong alkali and high temperature. Huang Xiao et al. Made silicon paste with fumed silica and 580 MPa · s dimethylsilicone oil (mass ratio 1:12.5) at 150 ℃, then added tween 80-span 80 composite emulsifier, viscosity methyl silicone oil, polyvinyl alcohol and water [M (water): m (polyvinyl alcohol)] = 10:1] to prepare a new type of silicone defoamer. The HLB value of the composite emulsifier was 10 and the reaction time was about 1 hour. The antifoaming and antifoaming effect of the silicone antifoam was significant, the antifoaming time was 253-312 s and the antifoaming time was 26-30 s.<br>Organosilicon defoamer has very low surface tension, excellent defoaming and antifoaming ability, and has little effect on the gloss of the film. However, if it is not used properly, it will have defects such as poor recoating performance and film shrinkage [27-28]. The development direction of this kind of defoamer is to adjust the silicone composition to ensure the defoamer performance, reduce the film defects and recoat obstacles, improve the compatibility, expand the application performance in different systems, and mix with other types of defoamers.<br>