天然橡胶对子午线轮胎钢丝粘合胶压延粘辊的影响研究

Effect of NR on Calendering Roll Sticking of Steel Wire Adhesive Compound for Radial Tire

胶料粘辊是钢丝帘布压延过程中常见的问题,天然橡胶(NR)对钢丝粘合胶的压延粘辊有较大影响。本工作研究表明,生胶的常规指标(如塑性初值、塑性保持率和门尼粘度等)和终炼胶的主要硫化特性(如门尼粘度、F_(L)和F_(max)等)均不足以表征其压延粘辊性能。橡胶加工分析仪(RPA)的测试发现,终炼胶的储能模量(G′)与压延粘辊直接相关,G′偏低是导致胶料压延粘辊的根本原因,而NR的热氧稳定性对G′有较大影响,建议采用RPA在160℃下评估生胶的热氧稳定性。

Compound sticking was a common and confusing issue during calendaring of steel cord ply,where natural rubber(NR)had a great effect on it.It was found that,the regular properties,including initial value of plasticity,plasticity retention index,Mooney viscosity of NR and Mooney viscosity,F_(L),F_(max) of the final master batch compound,were not sufficient to characterize the sticky issue.The test results of Rubber Processing Analyzer(RPA)showed that,the storage modulus(G′)of the final master batch compound was highly related to sticky issue,and the low G′was the root cause of sticky issue.However,the thermal oxidation stability of NR would affect G′of the compound greatly,it was recommended to use RPA to evaluate the thermo-oxidative stability of raw NR rubber at 160℃.