影响硬丁腈橡胶3604聚合反应速率的因素

Influence factors on synthesis reaction rate of hard nitrile rubber 3604

采用松香酸皂、油酸皂和萘磺酸钠甲醛(NSF)缩合物为复合乳化体系替代拉开粉热法合成丁腈橡胶3604,在水相pH值为10～12的条件下,考察聚合温度、引发体系、复合乳化剂的用量和配比等因素对聚合反应速率的影响。结果表明,在聚合温度为30℃,过硫酸钾与三乙醇胺的质量比为4.00/1,复合乳化剂中NSF缩合物为0.5份、松香酸皂和油酸皂的用量为3～4份(二者质量比为4/6或5/5)的反应条件下合成丁腈橡胶3604,其单体转化率在反应时间为10～11 h时可达70%～75%,聚合反应速率适中。

The nitrile rubber（NBR） 3604 was synthesized by thermal method at pH value 10-12 of the aqueous phase with rosin soap,oleic acid soap and sodium naphthasulfonate-formaldehyde（NSF） condensation compound as complex emulsion system to replace nekal BX.The influence factors of polymerization rate,such as reaction temperature,initiator system,amount and mass ratio of emulsifiers,were studied.The results showed that the conversion of monomers could reach 70%-75% under the conditions of polymerization time 10-11 h,and the polymerization rate was moderate when the temperature was 30 ℃,K2S2O8/triethanolamine（mass ratio） was 4.00/1,NSF condensation compound was 0.5 phr,the amount of rosin soap and oleic was 3-4 phr[rosin soap/oleic acid soap（mass ratio） 4/6 or 5/5] in complex emulsifier.