Styrene-acrylate latex with high glass transition temperature (T), low minimum film forming temperature(MFT) and good stability was prepared via core-shell emulsion polymerization. With semicontinuous process, hig...Styrene-acrylate latex with high glass transition temperature (T), low minimum film forming temperature(MFT) and good stability was prepared via core-shell emulsion polymerization. With semicontinuous process, high conversion rate of monomer and low gel rate were achieved. The weight ratio of core monomer to shell monomer was approximately 1.35. It is found that many factors such as emulsifiers, initiators, reaction temperature, pH value and polymerization technology have influences on the permormance of styrene-acrylate latex. The prepared latex was characterized by TEM and FTIR. The obtained latex with T of 20.57 ℃, MFT or5.0 ℃, and good stability, had good stability of film forming.展开更多
合成了含氢聚甲基硅氧烷/聚丙烯酸酯共聚乳液.研究了聚合工艺、配方组成及操作方式对聚合稳定性、动力学、乳液的粒径分布和产物性能的影响.采用部分预乳化单体滴加法(工艺A)和部分纯单体滴加法(工艺B)两种工艺,聚硅氧烷采用高速预乳化...合成了含氢聚甲基硅氧烷/聚丙烯酸酯共聚乳液.研究了聚合工艺、配方组成及操作方式对聚合稳定性、动力学、乳液的粒径分布和产物性能的影响.采用部分预乳化单体滴加法(工艺A)和部分纯单体滴加法(工艺B)两种工艺,聚硅氧烷采用高速预乳化滴加进料方式.用COULTER LS 粒径仪和Nicolet 傅立叶变换红外光谱仪分别测定共聚乳液的粒径分布和产物的结构.研究结果表明,采用A、B两种工艺均能得到平均粒径为0.101~0.103(m的单峰窄分布共聚乳液,并能有效地将含氢聚硅氧烷引入到共聚物大分子中.含氢聚硅氧烷的引入量为3%(质量)时,共聚物涂膜具有柔软、滑爽和强度高等优点.展开更多
文摘Styrene-acrylate latex with high glass transition temperature (T), low minimum film forming temperature(MFT) and good stability was prepared via core-shell emulsion polymerization. With semicontinuous process, high conversion rate of monomer and low gel rate were achieved. The weight ratio of core monomer to shell monomer was approximately 1.35. It is found that many factors such as emulsifiers, initiators, reaction temperature, pH value and polymerization technology have influences on the permormance of styrene-acrylate latex. The prepared latex was characterized by TEM and FTIR. The obtained latex with T of 20.57 ℃, MFT or5.0 ℃, and good stability, had good stability of film forming.
文摘合成了含氢聚甲基硅氧烷/聚丙烯酸酯共聚乳液.研究了聚合工艺、配方组成及操作方式对聚合稳定性、动力学、乳液的粒径分布和产物性能的影响.采用部分预乳化单体滴加法(工艺A)和部分纯单体滴加法(工艺B)两种工艺,聚硅氧烷采用高速预乳化滴加进料方式.用COULTER LS 粒径仪和Nicolet 傅立叶变换红外光谱仪分别测定共聚乳液的粒径分布和产物的结构.研究结果表明,采用A、B两种工艺均能得到平均粒径为0.101~0.103(m的单峰窄分布共聚乳液,并能有效地将含氢聚硅氧烷引入到共聚物大分子中.含氢聚硅氧烷的引入量为3%(质量)时,共聚物涂膜具有柔软、滑爽和强度高等优点.