溶聚丁苯橡胶挤出畸变行为的研究  

Study on Extrudate Distortion of Solution Polymerized Styrene-Butadiene Rubber

作　　者：张昊[1] 董彬[1] 孙显茹[1] 吴其晔[1] 

机构地区：[1]青岛科技大学 橡塑材料与工程教育部重点实验室,山东青岛266042

出　　处：《橡胶工业》2013年第3期140-146,共7页China Rubber Industry

摘　　要：研究两种不同结构的溶聚丁苯橡胶(SSBR-T2003和SSBR-2305)生胶及混炼胶的挤出畸变行为及机理。结果表明:两种生胶挤出时均发生整体挤出畸变,其中SSBR-2305的畸变更严重,这与该胶料相对分子质量大、分子链结构为端基锡偶联有关,而畸变根源来自于口模入口区强烈的拉伸流动失稳。填充炭黑可显著改善SSBR熔体的挤出流变性能,抑止整体畸变。炭黑的加入不仅降低了胶料的熵弹性,同时有稳定入口区流场的作用。SSBR-2305混炼胶在高剪切速率下出现类似第二光滑挤出现象。The extrudate distortion behavior and its mechanism of the raw rubber and compound of solution polymerized styrene-butadiene rubbers （SSBR-T2003 and SSBR-2305） having different struc- ture were investigated. In raw rubber extrusion, extrudate distortion occurred for both SSBR-T2003 and SSBR-2305 and the distortion of SSBR-2305 was worse due to higher molecular weight and branched structure. The distortion was caused by unstable extensional flow at the die entrance. With the addition of carbon black, the theological property of compound could be improved, the entropy e- lasticity of compound was reduced and the flow field at the die entrance was stabilized. Therefore, theoverall distortion was reduced. The smooth surface of extruded SSBR-2305 compound could also be ob- tained under high shear speed.

关 键 词：溶聚丁苯橡胶 炭黑 混炼胶 流变性能 挤出畸变 

分 类 号：TQ333.1[化学工程—橡胶工业] TQ330.381