天然橡胶硫化胶耐臭氧老化性能的快速评价方法  

Quick evaluation method of ozone aging resistance for natural rubber vulcanizate

作　　者：吴玲玲 穆洪帅 肖同亮 谭莲影[1] 余海文 黄良平[1] 王雪飞[1] WU Ling-ling;MU Hong-shuai;XIAO Tong-liang;TAN Lian-ying;YU Hai-wen;HUANG Liang-ping;WANG Xue-fei(Rail Transportation Business Unit,Zhuzhou Times New Material Technology Co Ltd,Zhuzhou 412007,China)

机构地区：[1]株洲时代新材料科技股份有限公司轨道交通事业部,湖南株洲412007

出　　处：《合成橡胶工业》2023年第2期134-138,共5页China Synthetic Rubber Industry

摘　　要：考察了伸长率、臭氧体积分数、相对湿度等试验条件对天然橡胶(NR)硫化胶耐静态臭氧老化性能的影响,建立了NR硫化胶耐臭氧老化的快速评价方法,并用该方法优选出了适宜NR胶料的防护蜡及其适宜用量。结果表明,提高伸长率,增加臭氧体积浓度和相对湿度,试样表面开始出现臭氧龟裂且龟裂程度逐渐增大。炭黑填充的NR硫化胶耐臭氧老化性能适宜的快速评价条件为:温度为40℃、伸长率为50%、臭氧体积分数为1.00×10^(-4)%、相对湿度为50%。提高防护蜡中异构烷烃含量和中间碳数烷烃含量以及防护蜡用量,有利于改善NR硫化胶耐臭氧老化性能。运用该快速评价方法筛选出NR硫化胶耐臭氧老化性能较好的为防护蜡A,其最佳用量为3份。The effects of elongation,ozone volume concentration,relative humidiy on ozone aging resistance of natural rubber(NR)vulcanizates had been investigated.A quick evaluation method of ozone aging resistance for NR vulcanizate was established.The appropriate type and amount of protective wax for NR vulcanizate were optimized by this method.Test results showed that the ozone cracking began to appear on the surface of samples and the degree of cracking gradually increased with higher elogation and ozone volume concentration as well as relative humidity.The test condition of 50%maximum elongation and 1.00×10^(-4)%ozone volume fraction with 50%relative humidity at 40℃could characterize the resistance to ozone aging of NR vulcanizates filled with carbon black quickly.The protective wax with high content of non-normal pafaffins and intermediate carbon paraffins had good protection effect of static ozone for NR vulcanizates.Using this quick evaluation method,protective wax A was found to have better performance of ozone aging resistance for NR vulcanizate.And the optimum amount of protective wax A was 3 phr.

关 键 词：天然橡胶 硫化胶 耐臭氧老化性能 防护蜡 伸长率 臭氧浓度 相对湿度 

分 类 号：TQ330.7[化学工程—橡胶工业]