论文部分内容阅读
以丙烯酸丁酯(BA)、丙烯酸甲酯(MA)和丙烯腈(AN)为主要原料,烷基酚聚氧乙烯醚(OP-10)和十二烷基磺酸钠(SDS)为复合乳化剂,过硫酸铵(APS)和亚硫酸氢钠(NaHSO3)为氧化还原型引发剂,采用种子乳液聚合法制备了丙烯酸酯乳液;然后以多元醇A作为丙烯酸酯乳液的交联改性剂,制备了醇酸交联型丙烯酸酯乳液,实现了热交联体系无甲醛化。结果表明:当聚合温度为70℃、w(引发剂)=2.4%、m(BA)∶m(MA)∶m(AN)=33∶11∶6、w(复合乳化剂)=5%且m(OP-10)∶m(SDS)=1∶1.5时,丙烯酸酯乳液的综合性能较好;当n(丙烯酸)∶n(多元醇A)=30∶1、w(丙烯酸)=1.0%时,交联改性乳液的固含量为51.40%、单体转化率为98.3%;交联改性乳液的胶膜吸水率(10.08%)比未改性乳液降低了82.4%,但两者的热稳定性均较高且相差不大。
The main raw materials of butyl acrylate (BA), methyl acrylate (MA) and acrylonitrile (AN) were alkylphenol polyoxyethylene ether (OP-10) and sodium dodecyl sulfate (SDS) (APS) and sodium bisulfite (NaHSO3) as redox initiators, the acrylic emulsion was prepared by the seed emulsion polymerization method. Then, using the polyol A as the crosslinking modifier for the acrylate emulsion, Alkyd cross-linked acrylate emulsion was prepared to achieve the formaldehyde-free heat-crosslinking system. The results showed that when m (BA): m (MA): m (AN) = 33:11:6 and w (composite emulsifier) = 5% at the polymerization temperature of 70 ℃ (acrylic acid): n (polyol A) = 30: 1, w (acrylic acid) = 1.0% , The crosslinked modified emulsion has a solid content of 51.40% and a monomer conversion of 98.3%. The water absorption of the crosslinked modified emulsion (10.08%) is 82.4% lower than that of the unmodified emulsion, High thermal stability and little difference.