恒粘剂2-巯基苯并噻唑对天然橡胶性能的影响

Effect of Viscosity Stabilizer 2-Mercaptobenzothiazole on Properties of Natural Rubber

采用恒粘剂2-巯基苯并噻唑(MT)制备恒粘天然橡胶(CVNR),研究其性能,并与传统的恒粘剂盐酸羟胺(HH)进行对比。结果表明:采用恒粘剂HH或MT均能制备出恒粘效果较好的NR。随着贮存时间的延长,MT-CVNR的重均相对分子质量(Mw)、塑性初值(P0)和门尼粘度基本恒定不变;HH-CVNR的Mw、P0和门尼粘度起初变化不大,但随着贮存时间的延长均有不同程度的增大,逐渐失去恒粘特征。与HH-CVNR硫化胶相比,MT-CVNR硫化胶的物理性能明显较好。

The constant viscosity natural rubber （CVNR） was prepared by using viscosity stabili- zer 2-mercaptobenzothiazole （MT）. The properties of CVNR were then investigated, and compared with those of CVNR prepared by using viscosity stabilizer hydroxylamine hydrochloride （HH）. The results showed that, the CVNR with either MT or HH possessed good viscosity stability. As the storage time increased,the weight average molecular weight （Mw）,plastic initial value （P0） and Moo- ney viscosity of MT-CVNR basically remained unchanged. Those properties of HH-CVNR also changed little in the beginning of storage, but as the storage time extended, the numbers increased and the rubber gradually lost the viscosity stabilizing property. In addition,the physical properties of MT-CVNR vulcanizates were better than those of HH-CVNR vulcanizates.