交联型聚丙烯酸丁酯胶乳的合成

SYNTHESIS OF CROSSLINKED POLYBUTYL ACRYLATE LATEX

以十二烷基硫酸钠为乳化剂，过硫酸铵为引发剂，丙烯酸丁酯经两步乳液聚合，合成了胶粒粒径大于２５０ｎｍ、凝胶含量大于９０％、适用于合成丙烯酸酯－丙烯腈－苯乙烯共聚物的交联型聚丙烯酸丁酯胶乳。第一步乳液聚合配方及条件：乳化剂用量２％～４％，引发剂用量０．１％～０．４％，交联剂用量２．４％～２．８％；单体采用滴加乳液法或滴加单体法，聚合温度６０～７０℃，聚合时间３～４ｈ。第二步种子聚合条件：乳化剂用量／种子胶乳量不大于１０．２％，种子胶乳量／单体用量小于５．０％，聚合温度６０～７０℃，聚合时间３～５ｈ。

The crosslinked polybutyl acrylate latex with a particle diameter more than 250nm, a gel content more than 90%, suitable for the synthesis of acrylate-acrylonitrile-styrene copolymer, was synthesized by the two-step emulsion polymerization, using sodium dodecyl sulfate as emulsifier and ammomium persulfate as initiator.The recipe and conditions in the frist step of emulsion polymenrization were: emulsifier 2%～4%,initiator 0.l%～0.4%,crosslinking agent 2.4%～2.8%,the monomer adding method adopting emulsion dropping or monomer dropping, polymerization temperature 60～70℃, and polymerization time 3～4h. The conditions in the second step of seed polymerization were:emulsifier/seed latex less than l0.2%, seed latex /monomer less than 5%,polymerization temperature 60～70℃,and polymerization time 3～5h.