作　　者： ; ;

机构地区： 广东工业大学轻工化工学院

出　　处： 《塑料》 2019年第3期4-7,共4页

摘　　要： 通过转矩流变仪测试了临界脱模用量,研究了聚乙烯蜡A-C617A和硬脂酸钙(CaSt2)作为PVC润滑剂的金属润滑特性,结果表明:两者均为有效的金属润滑剂,单独使用时,后者明显比前者更有效,协同使用时,具有明显的协同效应。协同作用的金属润滑作用机理为:单独使用时,两者均可铺展润湿金属表面,形成润滑层,阻碍PVC熔体与金属表面直接接触,CaSt2以极性头向内而非极性尾向外的方式润湿金属表面;合并使用时,A-C617A蜡分子可插入CaSt2润滑层的非极性尾-非极性尾界面和CaSt2润滑层极性尾-PVC熔体界面形成滑移层,而CaSt2能溶解于A-C617A,并吸附于A-C617A-金属界面和A-C617A-PVC熔体界面,提高了稳定性,润滑层阻碍了PVC熔体与金属表面的直接接触润滑效果得到明显增强。 The metal lubrication of polyethylene wax A - C 617A and calcium stearate ( CaSt2 ) as polyvinyl chloride (PVC) lubricants were investigated by testing the critical use levels for metal release using a torque rheometer. The results indicated that these two lubricants were both the effective metal lubricants,although the former was significantly less effective than the latter;there was a significant synergistic effect when they were combined. The metal lubrication mechanisms of A - C 617A and CaSt2 could be deduced as follows. When they were used alone,both could spread over and wet the metal surface to form a lubricating layer to prevent the PVC melt and metal surface from contacting directly,and CaSt2 wetted the metal surface with the polar heads inward and non - polar tails outward. When they were combined,on the one hand,the molecules of A - C 617A could be inserted into the non - polar tail interfaces of CaSt2 lubricating layers and the interfaces between CaSt2 lubricating layer's non - polar tail and PVC melt to form slip layers,on the other hand,CaSt2 could be dissolved in A - C 617A and adsorbed on A - C 617A - metal interfaces and A - C 617A - PVC melt interfaces to make the stability improved. As a result,the effect of the lubricant layers on preventing the PVC melt and metal surface from contacting directly was enhanced.

关 键 词： 聚氯乙烯 润滑剂 聚乙烯蜡 硬脂酸钙 金属润滑作用 机理

领　　域： []