PVC的升级换代产品——纳米PVC复合树脂

A new type of PVC resin——Nano-PVC composite resin

在杭州华纳化工有限公司开发的纳米CaCO3微乳液存在下采用原位聚合方法制备纳米PVC复合树脂,在云南盐化股份天塑分公司30m3聚合釜上实现了产业化。该项目研究了纳米CaCO3团聚体的解离技术及原位聚合过程中的继续分散情况。透射电子显微镜(TEM)图像显示:纳米CaCO3在PVC基体内呈微胶束结构和微爆炸崩解结构,聚合过程崩解后的纳米CaCO3颗粒直径为5～10nm,呈良好的分散分布。在剪切速率为50rad/s的剪切流变实验中,纳米PVC比普通PVC切变黏度降低了一个数量级。在ThermoHaake上进行塑化实验,实验温度185℃、转速50r/min,纳米PVC的塑化时间为2.5min,普通PVC的塑化时间则需要6min。

Nano-PVC composite resin was commerically synthesized by in-situ polymerization in the presence of nano-CaCO3 microemulsion,which was developed by Hangzhou Huana Chemical Industry Co.,Ltd.,in 30 m^3 polymerizer in Yunnan Yanhua Inc.The dissociation and redispersion of aggregated nano-CaCO3 particles during in-situ polymerization were studied.TEM pictures showed that nano-CaCO3 were well dispersed in PVC matrix in the form of micromicelle structure and microexplosion disintegration structure.The diameter of disintegrated particles during polymerization ranged from 5 to 10 nm.The shear rheological tests at shear rate 50 rad/s showed that the shear viscosity of nano-PVC composite resin was about 10 times lower than that of common PVC resin.In the plasticizing experiments on ThermoHaake rheogoniometer,the plasticizing time was 2.5 minutes for nano-PVC composite resin,versus 6 minutes for common PVC resin,at 185 ℃ and 50 rpm.