【摘要】 成功开发了一种聚合级纳米CaCO3 微乳化体系 ,可直接用于氯乙烯 (VCM )的原位聚合。当体系与VCM比例在 3 %～ 5 %时 ,所得PVC -SG5型树脂白度为 86 ,表观密度为 0 .5 9g/mL ,吸油率达到 2 5 %左右 ,PVC树脂加工流变性能比传统产品有大幅提高 ,制品的冲击性能增加 2～ 4倍。电镜显示纳米颗粒与PVC基体之间呈三维网架结点结构 ,在高分子基体内部分纳米颗粒崩解为 5～ 10nm的粒子。该项技术解决了纳米微乳化体系稳定性的问题 ,并初探了纳米原位聚合反应动力学和成粒过程的影响因素。已先后在国内2万t/a工业装置及 6万t/a生产流程实现了产业化。更多还原

【Abstract】 A system of nano-calcium carbonate microemulsion is successfully developed,which can be applied to in-situ polymerization of vinyl chloride.When the weight ratio of this emulsion to vinyl chloride monomer is about 3%～5%,the whiteness,bulk density and oil absorption of obtained SG5 PVC resin reach to 86,0.59 and 25%,respectively,and its processing rheological property is greatly improved while impact strength of products made of this kind of resin increases twice than that of those ordinary products.Photographs of electron microscope show that three-dimensional networks are formed between nano-calcium carbonate particles and PVC particles inside this resin and a part of nano-calcium carbonate particles crack into smaller parlicles of 5～10 nm.This technology resolves the stability of nano-miccroemulsion.The kinetics of nano-in-situ polymerization and the mechanism of particle formation are investigated.This technology has been adopted in domestic PVC production focilities of 20,000 t/a and 60,000 t/a successively.更多还原