高效乳液型有机硅消泡剂的制备及性能研究

将质量比为100：8的甲基硅油和气相法二氧化硅于130～150℃处理3～5h，再和聚醚硅油、复合乳化剂（由Span80与Tween80组成）、羧甲基纤维素钠等复配，制得高效乳液型有机硅消泡剂．最佳制备条件是：甲基硅油的粘度为600-800mPa·s，用量为16％～17％（质量分数，下同）；气相法二氧化硅用量为1．3％；聚醚硅油（粘度800～1000mPa·s）用量为10％；复合乳化剂的亲水亲油平衡值（HLB值）为10，用量为6％；羧甲基纤维素钠用量为1％．实验结果表明：该消泡剂消泡效果好，其主要技术指标与国外同类型产品相当．消泡剂乳液的离心稳定性、耐热稳定性好，且在水中的分散性良好．

PREPARATIONS AND PROPERTIES OF HIGH PERFORMANCE EMULSION ORGANOSILICONE ANTIFOAMING AGENT

High performance emulsion organosilicone antifoaming agent was preparated by reacting methyl silicone with gas silicon dioxide （their mass ratio is 100： 8） at 130-150℃ for 3-5 h, and then formulation technology with polyether silicone, mixture emulsion （composed of span-80 and tween-80）, carboxyrnethyl cellulose sodium. The optimum conditions were that viscosity and dosage of the methyl silicone are 600-800 mPa · s and 16%-17%, and the dosages of gas silicon dioxide, polyether silicone （viscosity is 800-1 000 mPa · s）, mixture emulsion （hydrophilic and lipophilic balance equal to 10） and carboxymethyl cellulose sodium are 1.3%, 10%, 6% and 1%, respectively. The experimental results showed that the antifoam effects of the antifoaming agent is obvious, and its the main technical criterias correspond with products of the same kind. The centrifugal stability, heat-resistant sta- bility and dispersibility in the water of the antifoaming agent are good.