PVC型材发黄的原因  

Reasons for the yellowing of PVC profiles

作　　者：刘容德[1] 李静[1] 桂俊杰[1] 贾小波[1] 

机构地区：[1]中国石化股份有限公司齐鲁分公司研究院,山东淄博255400

出　　处：《聚氯乙烯》2009年第4期15-17,共3页Polyvinyl Chloride

摘　　要：测试了用于生产型材A(合格品)和型材B(颜色发黄)的PVC树脂的原始白度、老化白度、热稳定时间、分子质量及其分布和型材A、型材B的凝胶化度,结果表明:①与型材A相比,用于生产型材B的PVC树脂的原始白度、老化白度、热稳定时间、分子质量及其分布都合格;②型材B外壁的凝胶化度比型材A外壁高约10%,表明挤出型材B时口模处的温度偏高,从而造成型材B表面颜色发黄。另外,还进行了模拟试验,验证了分析结果。The original whiteness, aging whiteness, thermal stabilization time, molecular weight and its distribution of PVC resins used for producing profiles A（qualified product） and B（yellowing） and gelification degree of A and B were measured. The results showed that （1） comparing with profiles A,the whiteness, aging whiteness, thermal stabilization time and molecular weight and its distribution of PVC resins used for producing profiles B were all qualified; （2）the gelification degree of the outer wall of profiles B was 10% higher than that of profiles A,which showed that the temperaturc of dic during the extrusion of profiles B was high,leading to the yellowing of the sur face of profiles B. Furthermore, simulation tests were carried out to verify the obtained analysis results.

关 键 词：PVC型材 DSC 凝胶化度 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]