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    • 5. 发明申请
    • SILICONE DISPERSIONS
    • 硅胶分散剂
    • WO2003099413A1
    • 2003-12-04
    • PCT/US2003/015907
    • 2003-05-21
    • DOW CORNING CORPORATIONCHRISTIANO, Steven, PatrickFEY, Kenneth, Christopher
    • CHRISTIANO, Steven, PatrickFEY, Kenneth, Christopher
    • B01D19/04
    • C11D17/0039B01D19/0404B01D19/0409B01J13/06C11D3/0026C11D3/373Y10S435/812
    • A silicone composition comprises a continuous phase of a polar organic liquid having dispersed therein particles of a silicone antifoam in intimate contact with and surrounded by an encapsulant. The encapsulant is solid at 25 ° C and is sparingly soluble in the polar organic liquid at 25 °C but is substantially dissolved in the polar organic liquid at an elevated temperature in the range 40-100 °C. The encapsulated silicone antifoam composition can be produced by (i) dispersing a polyorganosiloxane fluid, a solid organic material and a hydrophobic silicaceous material in a polar organic liquid with shear so that the average silicone particle size is less than 0.5mm., the temperature of the resulting dispersion being sufficiently high that the said organic material is dissolved in the composition; and (ii) cooling the dispersion to deposit the organic material onto the interface of the silicone particles while agitating sufficiently to maintain the silicone particle size below 0.5mm.
    • 有机硅组合物包含极性有机液体的连续相,其中分散有硅氧烷消泡剂的颗粒与密封剂紧密接触并被密封剂包围。 密封剂在25℃下为固体,并且在25℃下微溶于极性有机液体中,但在40-100℃的高温下基本上溶解在极性有机液体中。 封装的硅氧烷消泡剂组合物可以通过以下方法制备:(i)将聚有机硅氧烷流体,固体有机材料和疏水硅质材料分散在具有剪切力的极性有机液体中,使得平均硅氧烷颗粒尺寸小于0.5mm, 所得分散体足够高,使得所述有机材料溶解在组合物中; 和(ii)冷却分散体以将有机材料沉积到硅氧烷颗粒的界面上,同时充分搅拌以保持硅氧烷颗粒尺寸低于0.5mm。