氯乙烯/纳米碳酸钙原位悬浮聚合转化率的控制

Controlling the conversion of in-situ suspension polymerization of VCM/nano-CaCO_3

采用悬浮法进行氯乙烯/纳米碳酸钙原位聚合,发现随着纳米碳酸钙用量的增加,出现降压的时间提前,聚合转化率下降。这是由于纳米碳酸钙对氯乙烯有吸附作用,并且影响到氯乙烯聚合动力学。经修正提出转化率、压降和温度模型,理论值与实验值较吻合。该模型可用于工业化生产纳米PVC过程中聚合转化率的控制。

During the in-situ suspension polymerization of VCM/nano-CaCO3,it was found that with the increasing of nano-CaCO3 adding amount,the time for the occurring of pressure reducing was moved up and the conversion of polymerization was reduced.This was due to the absorption of nano-CaCO3 to vinyl chloride,which could further influence the polymerization mechanism of vinyl chloride.Through revision,a model of conversion,pressure and temperture was proposed and the theoretical data was well consistent with the experimental data.This model could be used to control the polymerization conversion in the commercial production of nano-PVC.