摘要
采用种子乳液法,以反应性表面活化剂十一烯酸钠为表面活性单体,过硫酸钾/亚硫酸氢钠为氧化还原引发体系,进行丙烯酸酯无皂乳液聚合以及有机硅改性丙烯酸酯无皂乳液聚合研究。详细考察了反应温度、十一烯酸钠用量以及有机硅加入与否对乳液聚合和乳液性能的影响。研究结果表明,当十一烯酸钠用量为3%、反应温度为70℃时,丙烯酸酯乳液有很好的聚合稳定性和贮存稳定性。有机硅改性丙烯酸酯乳液相对较难合成,但在氧化还原条件下,可以得到稳定的无皂硅丙乳液。透射电镜表明,有机硅先加法得到的乳胶粒子为均匀的球形核壳结构,而有机硅后加法得到的乳胶粒子形状不规则。无皂乳液比相应的有皂乳液耐水性好。
Study has been made on polymerization of nonsoap acrylate emulsion and organosiloxane modified nonsoap acrylate emulsion using sodium undecylenate （NaUA） as surface active monomer and K2S2O8 /NaHSO3 as redox initiation system adopting seed emulsion method. The effect of polymerization conditions including reaction temperature,the amount of NaUA and the effect of presence of organosiloxane on polymerization and property of the emulsion was studied systematically. The study result indicates that acrylate emulsion is very stable during the emulsion polymerization and storage when the addition of sodium undecylenate is 3% and reaction temperature is 70 ℃. The organosiloxane modified nonsoap acrylate emulsion is relatively difficult to synthesis. Yet a stable nonsoap polysiloxane-aerylate emulsion can be obtained under redox condition. TEM showed that the emulsion particle is in uniform core-shell sphere structure when the organosiloxane was added in the beginning and the emulsion particle shape is irregular when the organosiloxane was added in the end. Water resistance of nonsoap emulsion is much better than that of relevant emulsion containing emulsifier.
出处
《新型建筑材料》
北大核心
2008年第2期53-57,共5页
New Building Materials
基金
天津市高等学校科技发展基金资助项目(20041001)
关键词
无皂乳液
有机硅
表面活性单体
十一烯酸钠
nonsoap emulsion
organosiloxane
surface active monomer
sodium undecylenate
