用转矩流变仪研究丁苯橡胶的加工流变性能  

Study on processing rheological properties of styrene-butadiene rubber by torque rheometer

作　　者：董文敏 马勇 何子锋 朱红[1] 裴雨飞 DONG Wen-min;MA Yong;HE Zi-feng;ZHU Hong;PEI Yu-fei(China Rubber Industry Association, Beijing 100107, China;Beijing Tiancheng Linglong Tire Co Ltd, Beijing 101102, China)

机构地区：[1]中国橡胶工业协会,北京100107 [2]北京天诚玲珑轮胎有限公司,北京101102

出　　处：《合成橡胶工业》2019年第4期277-281,共5页China Synthetic Rubber Industry

摘　　要：选取轮胎行业常用的门尼黏度相近[ ML (1+4)100 ℃均为50左右]的乳聚丁苯橡胶和溶聚丁苯橡胶,采用转矩流变仪毛细管挤出模式测试了它们的加工流变性能,并与用橡胶加工分析仪测试结果进行了对比。结果表明,随着螺杆转速的增加,剪切速率和剪切应力均增大,测试样品的表观剪切黏度降低,并且表观剪切黏度在较低的剪切速率(低于50 s -1 )和温度(120 ℃和130 ℃)下降幅度更明显;挤出毛细管的长径比越小,相同转速条件下的剪切速率越大,样品的表观剪切黏度越低。所有测试的丁苯橡胶样品均为假塑性流体,遵循Ostwald-de Wale幂律方程。可以通过控制非牛顿指数的范围来掌控原材料的加工性能稳定性。The commonly used emulsion polyme-rized styrene-butadiene rubber and solution polyme-rized styrene-butadiene rubber in tire industry, which the Mooney viscosity were similar (all around 50), were selected. The processing rheological properties were tested by using the capillary extrusion mode of the torque rheometer.The test results showed that with the increase of screw rotation speed, shear rate and shear stress increased, and the apparent viscosity decreased. Apparent viscosity decreased significantly at low shear rate (less than 50 s -1 ) and low temperature (120 ℃ and 130 ℃), the smaller the aspect ratio was, the higher the shear rate was and the lower the apparent viscosity was. The styrene-butadiene rubber samples tested were all non-newtonian fluids, following the Ostwald-de Wale power law, which could control the quality stability of products by controlling the range of non-Newtonian index.

关 键 词：丁苯橡胶 加工流变性能 表观剪切黏度 转矩流变仪 幂律方程 非牛顿流体 

分 类 号：TQ333.1[化学工程—橡胶工业]