无甲醛聚丙烯酸酯乳液的制备及性能评价

Preparation and properties evaluation of formaldehyde-free polyacrylate emulsion

采用乳液聚合,以丙烯酸甲酯(MA)、丙烯酸丁酯(BA)和苯乙烯(St)为基本聚合单体,丙烯酸(AA)、甲基丙烯酸缩水甘油酯(GMA)替代N-羟甲基丙烯酰胺(NMA)为活性单体,十二烷基硫酸钠(SDS)、复合脂肪醇聚氧乙烯醚(复合AEO)替代传统的OP系乳化剂,过硫酸铵(APS)为引发剂,制备了无甲醛聚丙烯酸酯乳液.研究了单体选择及配比、预乳液pH、乳液pH及自制无甲醛交联剂用量对单体转化率及乳液应用性能的影响.结果表明:w(BA)=58%,w(MA)=28%,w(St)=10%,预乳液pH=4,乳液pH=8,GMA用量3.0%(对单体质量)时,可使制备的乳液具有优异的综合性能.

Formaldehyde-free polyacrylate emulsion was prepared with emulsion polymerization tech- nique using methyl acrylate （MA）, butyl acrylate （BA） and styrene （St） as basic polymerizing monomers. Acrylic acid （AA） and glycidyl methacrylate （GMA） substituted for N-methylol acrylamide （NMA） as reactive mono- mers, sodium dodecylsulfate （SDS） and composite fatty alcohol ether polyethylene oxide （composite AEO） re- placed traditional OP department emulsifier as emulsifier and ammonium persulfate （APS） was employed as ini- tiator. The effects of monomers and the proportion, pH of pre-emulsion and emulsion, dosage of self-made formaldehyde-free crosslinking agent on the reaction conversion rate and application properties of emulsion were investigated. The results showed that when w（BA）-58%, w（MA）=28%, w（St）=10%, the pre-emulsion pH was 4, product emulsion pH was 8, dosage of GMA was 3.0%（on the mass of monomers）, the prepared emul- sion had excellent comprehensive properties.