小粒径聚丙烯酸酯乳液的合成及助成膜性能

Synthesis and Assistant-film-forming Performance of Polyacrylate Emulsion

摘要:

采用种子半连续乳液聚合法合成了小粒径聚丙烯酸酯乳液（PA），取代有机小分子成膜助剂辅助硬树脂乳液成膜，制备超低挥发性有机化合物（VOC）含量的水性木器涂料。考察了PA玻璃化转变温度(Tg)、乳化剂配比及添加量和甲基丙烯酸(MAA)用量等对乳液聚合稳定性、乳液性能及助成膜性能的影响。结果表明：聚合物Tg由0℃降到-20℃时，PA助成膜能力明显增强；复合乳化剂中随反应性乳化剂比例的增大，凝胶率从0.83%降低到0.10%；乳化剂的用量增加到2.1%时，乳液平均粒径可减小到69nm, 助成膜能力增强；MAA添加量为4.5%时制备的PA配制的水性木器涂料的总VOC含量低至33g/L。

Abstract:

The polyacrylate emulsion (PA) were synthesized by seeded semi-continuous emulsion polymerizations，which used as a coalescent of the hard resin latexes to replace small organic molecules, to prepare ultra-low volatile organic compound (VOC) contents waterborne wood coatings. Effects of Tg of PA, proportions and dosages of emulsifiers, and amounts of MAA on emulsion polymerization stability, properties and assistant-film-forming performance of PA were studied. It was found that the assistant-film-forming ability of PA was obvious increased with decreasing of polymer Tg from 0℃ to -20℃; and the gel contents of PA reduced from 0.83% to 0.10% with increasing of the reactive emulsifier contents; the PA average particle sizes could be reduced to 69nm with increasing of emulsifier dosage up to 2.1% and the assistant-film-forming ability of PA was enhanced as well; The total VOC content waterborne wood coatings formulated by PA with 4.5% MAA dosage was low to 33 g/L.