自交联丙烯酸酯类反应性微凝胶乳液的聚合稳定性(英文)

Research on polymerization stability of self-crosslinking acrylate reactive microgels latex

采用半连续种子乳液聚合方法合成了自交联丙烯酸酯类反应性微凝胶乳液，研究了聚合工艺条件对聚合反应稳定性的影响。结果表明，当增大乳化剂SDS／OP-10的用量或加快预乳化单体的滴加速度时，聚合反应稳定性增加；随着引发剂过硫酸钾（KPS）、交联剂三羟甲基丙烷三丙烯酸酯（TMPTMA）和单体用量的增加，微凝胶颗粒分子间的交联反应增强，聚合反应稳定性下降。加入功能性单体甲基丙烯酸（MAA）和丙烯酸（AA）都能使聚合反应的稳定性增强，随着MAA用量的增加，聚合反应稳定性呈先增强后下降的趋势。当所加入的SDS／OP-10质量分数为3％-4％、KPS为0．4％-0．6％、TMPTMA为1％-3％、MAA不超过3％及单体为30％-40％，预乳化单体滴加速率为20-30mL／h时，聚合过程的稳定性最好。由傅里叶变换红外光谱分析可知，通过优化聚合条件，得到了含有官能性环氧基和羧基的丙烯酸酯类反应性微凝胶乳液。

The self-crosslinking acrylate reactive microgels latex was synthesized with semi-continuous and seeded emulsion polymerization technology. The effects of polymerization conditions on the polymerization stability were investigated. The experiment results showed that the polymerization stability was improved with the increase of emulsifier and the pre-emulsified monomers feeding rate. When the amount of initiator potassium poroxodisulfate （KPS）, crosslinker trimethylol propane trimethacrylate （TMPTMA） and the total monomer increased, the polymerization stability became worse. The addition of functional monomer methacrylie acid （MAA） was beneficial to the polymerization stability. The optimal reaction conditions were the mass fraction of emulsifier at 3% - 4% , KPS at 0.4% - 0. 6% ,TMPTMA at 1% - 3% , MAA no more than 3% , total mono- mers at 30% - 40% and the pre-emulsified monomers feeding rate 20 - 30 mL/h. The Fourier transform infrared spectrometer tests demonstrated that the self-crosslinking reactive microgels latex with epoxy and carboxyl groups was obtained with optimized polymerization conditions.