本体连续法制备高抗冲聚苯乙烯树脂引发体系的研究

Polymerization of High Impact Polystyrene Resin Initiation System by Continuous Bulk Process

利用平推流反应器和连续本体聚合方法,制备了高抗冲聚苯乙烯树脂(HIPS)。分别研究了热引发体系和自由基引发体系下,HIPS树脂制备过程中的橡胶相接枝反应和PS相的形成过程,以及对HIPS性能的影响。结果表明,对于热引发体系而言,橡胶相的接枝反应主要存在于第一反应器和第二反应器的4区,PS相的形成主要存在于第二反应器的5、6区和第三、第四反应器;对于自由基引发体系,橡胶相接枝反应和PS的聚合反应在低于热引发体系的温度下进行,接枝反应则主要发生于第一、第二反应器,PS相的形成主要在第三、第四反应器中进行。反应初期温度降低有利于橡胶相接枝反应,而反应后期温度升高则利于高摩尔质量PS的制备,自由基引发体系制备的HIPS性能更加优良。

A plug flow reactor was used to produce high impact polystyrene （HIPS） using continuous bulk polymerization. The grafting reaction in rubber phase and PS phase formation during the polymerization of HIPS was studied under both thermal and radical initiating system. The influence on the performance of HIPS was also studied. For thermal initiating system, the grafting reaction in rubber phase mainly took place in the first and the fourth area of the second reactor. At the same time, the formation of PS phase formed in the fifth and sixth area of the second reactor and the third and fourth. For radical initiating system, the temperature when the grafting reaction and the polymerization of PS happened was lower than thermal initiating system, and grafting reaction mainly took place in the first and second reactor, the PS phase formed in the 3rd and 4th. Reducing operating temperature in the initial stage of the polymerization was conducive to grafting and raising the temperature in the late stage could be better to get large molecular weight PS. HIPS made by radical initiating system had a higher performance.