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以过硫酸钾(KPS)和亚硫酸氢钠(NaHSO3)为自由基聚合体系的氧化-还原型引发剂,以十二烷基硫酸钠(SDS)和脂肪醇聚氧乙烯醚硫酸钠(AES)为阴/非离子型复合乳化剂,制备甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)和甲基丙烯酸(MAA)共聚物乳液。研究了引发剂种类及用量对该乳液性能及聚合过程等影响,探讨并提出了酸性条件下丙烯酸酯乳液体系的新型引发机制。结果表明:在其他条件保持不变的前提下,当m(KPS):m(NaHSO3)=1.00:0.45、w(KPS+NaHSO3)=0.6%时,乳液的单体转化率(98%)和黏度(5.900 Pa.s)相对最高,反应时间(2.0 h)相对较短且初始聚合温度(60℃)相对最低,此时乳液质量最稳定。
An oxidation-reduction initiator with potassium persulfate (KPS) and sodium bisulfite (NaHSO3) as free radical polymerization system, sodium dodecyl sulfate (SDS) and sodium fatty alcohol polyoxyethylene ether sulfate (AES) As anionic / nonionic emulsifier, MMA, BA and MAA copolymer emulsions were prepared. The effects of initiator type and dosage on the performance and polymerization process of the emulsion were studied. A new initiator mechanism of acrylic emulsion system under acidic conditions was discussed and put forward. The results showed that the monomer conversion of the emulsion (98%) and the monomer conversion of the emulsion at the conditions of m (KPS): m (NaHSO3) = 1.00: 0.45 and w (KPS + NaHSO3) = 0.6% The viscosity is the highest (5.900 Pa.s), the reaction time (2.0 h) is relatively short and the initial polymerization temperature (60 ℃) is the lowest. At this time, the emulsion quality is the most stable.