醇酸交联型丙烯酸酯乳液的制备研究

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。

Study on preparation of alcohol-acid crosslinking type acrylate emulsion

With butyl acrylate(BA),methyl acrylate(MA) and acrylonitrile(AN) as main materials,alkyl phenol polyoxyethylene ether(OP-10) and sodium dodecyl sulphonate(SDS) as composite emulsifier,sodium bisulfite(NaHSO3)and ammonium persulfate(APS) as redox initiator,so a new acrylate emulsion was prepared by seeded emulsion polymerization.Then an alcohol-acid crosslinking type acrylate emulsion(namely heat-crosslinking system without formaldehyde) was prepared with polyol A as cross linker and modifier of the acrylate emulsion.The results showed that the acrylate emulsion had well combination property when polymerization temperature was 70 ℃,mass ratio of m(BA)∶m(MA)∶m(AN) was 33∶11∶6,mass fractions of initiator and composite emulsifier were 2.4% and 5% respectively,and mass ratio of m(OP-10)∶m(SDS) was 1∶1.5.The solid content and monomer conversion rate of crosslinking modified acrylate emulsion were 51.40% and 98.3% respectively when molar ratio of n(acrylic acid)∶n(polyol A) was 30∶1 and mass fraction of acrylic acid was 1.0%.The water absorption of crosslinking modified acrylate emulsion film(10.08%) was 82.4% less than that of unmodified acrylate emulsion,but their thermal stabilities were higher and nearness.