纳米CaCO3原位聚合PVC树脂的生产及加工应用

研究了纳米CaCO3的加入对氯乙烯原位悬浮聚合体系温度、压力及树脂性能的影响。结果显示：纳米CaCO3的加入，加剧了体系的聚合反应，压降提前出现；随着纳米CaCO3加入量的增大，树脂白度(按GB/T15595测定)由83％增加到86％，其它指标变化不大。将所得树脂用于PVC制品的加工应用，考察了其物理性能，结果显示：与同型号未改性PVC树脂相比，该树脂扭矩、物料熔融温度、产率、动态热稳定性等指标均有提高；随着纳米CaCO3加入量的增加，测试样冲击强度由3．68kJ／m^2增加到7．09kJ／m^2，拉伸强度由40．4MVa降低到37．2MVa，其它指标变化不大。

Manufacture, processing and application of nano- CaCO3 in- situ polymerization PVC resin

Influences of adding nano-CaCO 3 into in-situ polymerization system of VCM on t he polymerization temperature,polymerization pressure and properties of resin ob tained were studied.The results showed that (1)adding nano-CaCO 3 could intensi fy the polymerization reaction and pressure drop occurred earlier;(2)with the in crease of the adding amount of nano-CaCO 3,the whiteness of resin increased fro m 83% to 86%(measured as GB/T 15595 with little changes of other property indexe s.The resin obtained was applicated to the processing of PVC product,and its phy sical properties were investigated.The results showed that (1)compared with the same type of unmodified PVC resin,the properties,such as torque,melting temperat ure,rate of production,dynamic heat stability and etc.,of the resin obtained wer e all improved;(2)with the increase of the adding amount of nano-CaCO 3,the imp act strength of test sample increased from 3.68 kJ/m 2 to 7.09 kJ/m 2,and the tensile strength decreased from 40.4 MPa to 37.2 MPa with little changes of oth er property indexes.