水洗颗粒烟胶混合橡胶的干燥工艺条件优化

Optimization of Drying Process Conditions for Water Washed Granular Ribbed Smoke Sheet Mixed NR

对新开发的水洗颗粒烟胶混合橡胶的干燥工艺条件进行优化,对干燥温度和干燥时间两大主要工艺条件进行变量分析,确定了优化的干燥工艺条件:高温段温度为126℃、低温段温度为116℃、步进干燥时间为150 s。在此优化干燥工艺条件下,水洗颗粒烟胶混合橡胶的塑性初值、塑性保持率均达到较高的水平且稳定性较好,门尼粘度[ML(1+4)100℃]稳定在75~80之间,同时胶块干燥较彻底、不发粘,胶块内部没有水汽聚集和局部发白现象,产品质量和生产效率最佳。

The drying process of the water washed granular ribbed smoke sheet(RSS)mixed NR was optimized,and the two main process conditions of drying temperature and drying time were analyzed.The optimized drying process conditions were determined as follows:the temperature in the high temperature section was 126℃,and the temperature in the low temperature section was 116℃,and the step drying time was 150 s.The results showed that the initial plasticity value and plasticity retention index(PRI)of the water washed granular RSS mixed NR were relatively high and stable by using the optimized drying process,and the Mooney viscosity[ML(1+4)100℃]could be stabilized between 75 and 80.At the same time,the rubber block was more thoroughly dried and not sticky.There was no water vapor accumulation in the rubber block and no local whitening defect,and the product quality and production efficiency were the best.