扩链方式及扩链剂用量对PU/PVC复合树脂性能的影响  

Influence of Chain-extension Method and Chain-extender Content on Property of PU/PVC Composite Resin

作　　者：傅戚妹[1] 潘明旺[1] 袁金凤[1] 刘栋杰[1] 

机构地区：[1]河北工业大学高分子科学与工程研究所,天津300130

出　　处：《塑料工业》2008年第6期45-47,61,共4页China Plastics Industry

基　　金：河北省自然科学基金资助项目(B2006000014);河北省教育厅资助项目(项目号2004420)

摘　　要：首先制备自乳化阴离子水性聚氨酯(PU),然后以此为种子原位接枝共聚氯乙烯制备PU/PVC复合乳液树脂。通过动态激光粒度分析仪、动态力学分析仪(DMA)和TA-2000热分析仪研究了扩链方式以及扩链剂用量对PU粒径及其分布、乳液PU的动态力学性能和PU/PVC复合树脂耐热稳定性的影响。结果表明:分散时扩链所得到的PU乳液粒径较小,且随着扩链剂用量的增加粒径逐渐增大;预聚时扩链,扩链剂用量较高时聚氨酯的玻璃化转变温度较低;预聚时扩链的PU/PVC复合树脂的热稳定性较好,但随着扩链剂用量的增加耐热性下降。Self-emulsification anionic waterborne polyurethane （PU） was preparedfirst, and then used as seeds and grafted onto vinyl chloride by in-situ emulsion polymerization to prepare PU/PVC hybrid resin. The influence of chain-extension method and chain-extender content on the particle sizes and distributions of PU latexes, dynamic mechanical properties of latex PU, thermal properties of PU/PVC composite resins were investigated by means of laser particle size analyzer, dynamic mechanical analyzer and TA-2000-type thermal analyzer, respectively. The results showed the particle size of the PU latex by chain-extending during dispersion was smaller. The particle sizes of PU latexes increased with the increase of the chain-extender content. The more the chain-extender content, the lower the Tg Of the PU latexes prepared by chain-extension before dispersion. The stability of heat-resistance of composite resin was better, which was prepared by chain-extension before dispersion, but it decreased with the in- crease of chain-extender content.

关 键 词：水性聚氨酯 PU/PVC复合树脂 扩链剂 扩链方式 

分 类 号：TQ320.7[化学工程—合成树脂塑料工业]