几种胎面用橡胶及其混炼胶的应力弛豫特性  

Stress relaxation characteristics of several kinds of rubber and their compounds used in tire tread

作　　者：王焰[1] 赵素合[1] 梁磊[2] 

机构地区：[1]北京化工大学北京市新型高分子材料制备与成型加工重点实验室,北京100029 [2]北京化工大学纳米材料先进制备技术与应用科学教育部重点实验室,北京100029

出　　处：《合成橡胶工业》2009年第6期507-511,共5页China Synthetic Rubber Industry

基　　金：国家"十五"攻关计划资助项目(2004BA310A41)

摘　　要：研究了4种胎面用胶[星形全偶联溶聚丁苯橡胶(S-SSBR)、偶联度为40%的SSBR 2305、乳聚丁苯橡胶(ESBR),顺丁橡胶(BR)]生胶及其混炼胶的应力弛豫特性,分析了弛豫机理,考察了混炼胶的应力弛豫和挤出膨胀性能间的关系。结果表明,4种生胶及其混炼胶的应力弛豫过程均表现出快速和缓慢弛豫2个阶段;生胶的应力弛豫机理:ESBR和BR为缠结分子链束和自由分子链解取向过程,2种SSBR为锡偶联分子链束和分子链的解取向过程;4种混炼胶的弛豫机理为橡胶-炭黑变形网络的回缩和分子链受阻解取向过程;2种SSBR生胶及混炼胶的快速弛豫阶段更显著;在实验温度范围,随着温度升高,2种SSBR的弛豫时间明显缩短,ESBR略有缩短,BR变化不大。2种SSBR生胶与混炼胶的应力弛豫时间比值远大于ESBR和BR;2种SSBR混炼胶的应力弛豫时间短,挤出膨胀比小。The stress relaxation characteristics of four kinds of raw rubber, such as star-shaped solution-polymerized sty- rene-butadiene rubber （S-SSBR） , SSBR 2305 with coupling degree of 40% , emulsion styrene-butadiene rubber （ESBR） and cis-1 ,4-polybutadiene rubber（BR） , and their compounds were studied,and the stress relaxation mechanism was analyzed. The relationship between stress relaxation and extrusion swelling of the compounds was investigated. The results showed that the stress relaxation of all the four kinds of raw rubber and their compounds used in tire tread exhibited two stages, fast and slow relaxation. The stress relaxation mechanism of raw rubbers was found to be that the relaxation of ESBR and BR was deorientation of tangled molecular chains and free molecular chains, while the relaxation of S-SSBR and SSBR 2305 was the deorientation of coupled molecular chains and tangled free molecular chains. The stress relaxa-tion mechanism of rubber compounds was the retraction of rubber-carbon deformation network and deorientation of hin- dered molecular chains. The fast relaxation of the two kinds of SSBR raw rubber and rubber compounds was more obvi- ous. In the experiment temperature range, with the tempera- ture, the relaxation time of the two kinds of SSBR significantly shortened, ESBR slightly shortened and BR had little change. The stress relaxation time ratios of the raw rubbers to their rubber compounds of S-SSBR and SSBR 2305 respectively were much larger than those of ESBR and BR. Due to their shorter relaxation time, the compounds of S-SSBR and SSBR 2305 has smaller extrusion swelling ratio.

关 键 词：胎面胶 偶联溶聚丁苯橡胶 乳聚丁苯橡胶 顺丁橡胶 生胶 混炼胶 应力弛豫 挤出膨胀 

分 类 号：TQ333.1[化学工程—橡胶工业]