橡胶基体预分散母粒的制备和表征

Preparation and Characterization of Pre-Dispersed Rubber Masterbatch

采用预分散包覆造粒法制备橡胶基体预分散母粒。通过扫描电子显微镜、高级流变扩展系统和凝胶渗透色谱对橡胶基体品种、预分散体及其混炼胶进行研究。结果表明:低相对分子质量丁苯橡胶(LMWSBR)与促进剂NS的复合相容性和尺寸均匀性较好;LMWSBR制备的促进剂NS预分散体的临界应变值增大,在低频区域其弹性模量(G′)与频率(ω)的lg G′-lgω曲线出现平台,反映出网络的生成,而其高频区的流动性优于高相对分子质量丁苯橡胶(HMWSBR)制备的预分散体,这对预分散体的储存和加工有利;预分散体混炼胶的焦烧时间更长,加工安全性好。

The rubber masterbatch with pre-dispersed additive was prepared,and the influence of rubber and additive type,and properties of the compound with the masterbatch were investigated by SEM,ARES and GPC. The results showed that the compatibility between low molecular weight SBR（LMWSBR）and accelerator NS was good,and the dispersion of NS in the masterbatch was uniform. The masterbatch of LMWSBR and NS showed high critical strain value and a platform in lg G′-lgω curve in low frequency range which indicated formation of network. It also had better flow property than the masterbatch using high molecular weight SBR（HMWSBR）and accelerator NS in high frequency range,which was good for the storage and processing of the masterbatch. The compound with pre-dispersed masterbatch had longer scorch time and better processing property.