摘要
以苯乙烯（st）、丙烯酸丁酯（BA）、α-甲基丙烯酸（MAA）、乙烯基三乙氧基硅烷（VTES）为原料，采用种子乳液聚合法合成了硅烷偶联剂改性苯丙乳液。研究了反应温度、水解抑制剂、软硬单体配比、VTES加入方式及用量对乳液性能的影响。得出最佳工艺：反应温度为75～80℃，熟化温度为90℃，中和温度为40℃；m（St）：m（BA）=4：5，乳化剂的用量为单体总质量的4．5％，水解抑制剂乙二醇的用量为单体总质量的5％，VTES的用量为单体总质量的5％。按此工艺制得的VTES改性苯丙乳液的外观、钙离子稳定性、冻融稳定性、成膜性都较好；与纯苯丙乳胶膜相比，其乳胶膜的吸水率更低，耐有机溶剂性更好，Tg升高5℃，耐热性有所提高。
The silane coupling agent modified styrene-acrylic emulsion was synthesized by seed polymeri- zation, with styrene （St）, butyl acrylate （BA）, α-methyl acrylic acid （MAA）, vinyl triethoxysilane （VTES） as raw materials. The effects of reaction temperature, hydrolysis-resistance agent, and the ratio of soft-hard ingredients, the methods of addition and the content of VTES on film properties were also studied. The optimum reaction conditions were obtained： the reaction temperature was 75 -80℃, the ripening temperature was 90 ℃, the neutralization temperature was 40℃ ; m （St） ： m （BA） = 4： 5, the amount of emulsifiers was 4.5 % , the amount of hydrolysis-resistance agent ethylene glycol was 5 % , the amount of VTES was 5 %. The appearance, Ca2＋ stability, anti-freeze performance, film forming property of the modified emulsion were good. The water-absorption rate of film was lower than pure styrene-acrylic emulsion, the organic solvent resistance was better than that of pure styrene-acrylic emulsion, Ts was increased by 5 ℃, and the heat resistance was improved as well.
出处
《有机硅材料》
CAS
2010年第3期148-152,共5页
Silicone Material
