联合增稠对不饱和聚酯团状模塑料流变行为的研究

STUDY ON THE RHEOLOGICAL BEHAVIOR OF JOINT THICKENING ON BULK MOLDING COMPUND

模压流变性能是不饱和聚酯团状模塑料(BMC)在工业压制过程中相当重要的工艺参数。传统的BMC制造工艺,由于模压过程中流变性能较差,需要较大的模压压力及较长的模压时间,这样既增大了模具损耗,也降低了工厂的生产效率。系统讨论了化学增稠剂Ca(OH)_2在模压过程中对BMC流变行为的影响,在此基础上利用结晶性树脂与Ca(OH)_2对BMC进行联合增稠,对联合增稠的BMC的平板流动性能及螺旋流动性能进行分析。结果表明,结晶性树脂与Ca(OH)_2搭配的复合增稠体系不会影响BMC的固化行为,同时可以较好地改善BMC的模压流动性能,实现低压条件下BMC的成型。

Molded rheological property is a quite important process parameter for unsaturated polyester bulk molding compound（ BMC） in the industrial process of pressing. Due to the poor performance of rheological molding process in traditional manufacturing process of BMC,the molding requires larger molding pressure and longer molding time. As a result,it not only increases the possibility of die loss,but also reduces the productivity of the plant.This article discusses systematically the influence of rheological behavior of chemical thickener Ca（OH）2 in the molding process of BMC. On this basis,the crystalline resin was used to joint thicken BMC with Ca（OH）2. Through tablet flow properties and spiral flow analysis of thickened BMC,the results show that the crystalline resin and Ca（OH）2 as a complex thickening system will not affect the curing behavior of BMC. In fact,it can improve the molding flow properties of BMC and make the BMC be able to be molded under the low pressure.