摘要： 先合成了聚硅氧烷阴离子乳液以及链中含硅烷偶联剂和含氟单体的(甲基)丙烯酸酯聚合物乳液,并且利用羟基缩合反应,将2种乳液混合反应,通过乳液接枝共聚的方法合成了一种高硅含量的有机硅改性氟代(甲基)丙烯酸酯聚合物乳液,并采用了红外光谱对聚合物乳液分子进行了表征。测试结果表明:有机硅质量分数为20%、有机氟质量分数为12%的聚合物乳液涂膜综合性能最佳,较不含有机硅氟的聚合物乳液涂膜,其水表面接触角由77.5°增加到96°,24 h吸水率由5.3%下降到2.3%,耐水性大大增加;玻璃化转变温度由8.53℃下降到-2.74℃,聚合物分子链的柔顺性有所提高;同时乳液涂膜的初始分解温度提高了77～92℃,热稳定性也明显提高,说明此方法合成的高硅含量硅丙乳液可作为一类具有优良疏水性及低表面能的功能材料得以应用。
关键词:
长链聚硅氧烷,
含氟(甲基)丙烯酸酯聚合物,
乳液,
高硅含量
Abstract: The polysiloxane cationic emulsion and a acrylic emulsion containing fluorinated monomer and silane coupling agent were prepared first. Then, a high silicone content fluorosilicone -modified polyacrylic emulsion was synthesized by graft copolymerization reaction between polysiloxane cationic emulsion and fluoro-acrylate copolymers. The sturcture of the polymer in the emlsion was characterized by FT-IR spectrum. Results showed that when mass fraction of silicone was 20% and of fluorine was 12%, the polymer emulsion film was in the best performance. The contact angle of silicone-acrylic emulsion film was increased from 77. 5° to 96°. Water absorption in 24 h was decreased from 5.3% to 2. 3%. Hydrophobic property was improved greatly. Tg was decreased from 8.53 ℃ to -2.74 ℃. Flexibility of polymer chain was improved Furthermore, the initial decomposition temperature was increased by 77~92 ℃. Thermal stability was also improved. The Mluorosilicone-modified polyacrylic emulsion of high organosilicon content could be used as hydrophobic and heat resistant functional polymeric material.
Key words:
long chain branched polysiloxane,
fluoro-acrylate copolymers,
emulsion,
high silion content
赵 苑, 刘伟区, 闫振龙. 有机硅改性含氟(甲基)丙烯酸酯聚合物乳液的制备及其性能研究[J]. 涂料工业, 2012, 42(9): 1-5.
Zhao Yuan, Liu Weiqu, Yan Zhenlong. Synthesis of the Fluoro -(Meth)Acrylate Copolymers Modified by Long Chain Branched Polysiloxane and Study of Its Property[J]. Paint & Coatings Industry, 2012, 42(9): 1-5.