摘要： 以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、苯乙烯(St)为主要原料,以乙烯基三甲氧基硅烷(A-171)为改性单体,以烯丙基聚乙氧基磺酸盐(SE-10N)和十二烷基苯磺酸钠(DSB)为混合乳化剂,采用水溶性引发剂过硫酸铵(APS)和亚硫酸氢钠(SBS)与油溶性引发剂偶氮二异丁腈(AIBN)2种引发体系相配合的方式,通过烷氧基硅烷和苯乙烯混合单体对丙烯酸酯种子乳液先渗透溶胀,再进行聚合的方法(单体渗透法)合成了A-171含量高达50%的硅-苯丙乳液。利用傅里叶变换红外光谱仪对聚合物结构进行了分析,证明了A-171的引入,通过透射电子显微镜(TEM)对粒子形态、粒径分布进行了表征,用原子力显微镜(AFM)、扫描电子显微镜(SEM)相结合的方法对乳液的成膜性能以及成膜助剂的作用进行了分析。最后通过性能测试证明,A-171含量的提高有利于降低涂膜的吸水率,增强涂膜的热稳定性。

关键词: 高硅含量, 硅-苯丙乳液, 单体渗透, 成膜

Abstract: A stable alkylsilane modified polystyrene(PS)-polyacrylate(PA) emulsion with high alkylslane content(50%)was prepared via a monomer penetration method. In the synthesis methyl methacrylate(MMA), butyl acrylate (BA), styrene(St) were used as main monomers, and vinyl trimethoxysilane (A-171) as the modification monomer 1-nonylphenyloxy-2-deca(oxyethylene)-3-allyloxypropane ammonium sulfate(SE-10N) and sodium alkylated diphenyl ether disulfonateDSB) as emislsifiers,water-soluble ammonium persulfate(APS), sodium bisulfate(SBS )and oil-soluble2,2'-azobis (isobutyronitrile )(AIBN)as compound initiator system. A-171 was pre-mixed with St and swelled in the PA seed emulsion for the stable polymerization of A-171 with high content. The structure of the copolymer was analyzed by Fourier transform infrared spectroscopy(FT-IR). The size and structure of latex particles were analyzed by transmission electron microscope (TEM). The scanning electron microscope (SEM) and atomic force microscope (AFM) were applied to characterize the film-forming performance and function of coalescent. Furthermore, the effects of A-171 content on the water absorption and heat resistance properties of the latex films were studied. The results showed that the introduction of A-171 with high content could effectively reduce the water absorption and improve the heat resistance of latex films.

Key words: high alkylsilane content, alkylsilane modified polystyrene (PS)-polyacrylate (PA)emulsion, monomer penetration, film formation