摘要
研究由乙烯、丁烯和亚乙基降冰片烯为单体,茂金属催化合成的新型三元乙丙橡胶(EBT EPDM)和通用三元乙丙橡胶(EPDM)的耐低温性能以及炭黑种类对EBT EPDM胶料耐低温性能的影响。结果表明:与EPDM胶料相比,EBT EPDM胶料的t_(10)和t_(90)均缩短,F_(max)-FL增大;EBT EPDM硫化胶在低温条件(-40℃×72 h)下的压缩永久变形减小71.5%,脆性温度降低37.7%,低温回缩温度TR10最低,低温弯曲后表面未出现裂纹,耐低温性能优异;随着炭黑粒径的增大,EBT EPDM硫化胶的低温压缩永久变形减小,脆性温度降低;在相同低温条件下,EBT EPDM硫化胶的压缩永久变形与硅橡胶硫化胶相近,但EBT EPDM价格远低于硅橡胶,可拓宽其在低温密封领域的应用。
The low-temperature resistance of a new type of ethylene-butene-diene monomer(EBT EPDM)synthesized by metallocene catalysis and universal ethylene-propylene-diene monomer(E_(PDM)),as well as the effect of carbon black type on the low-temperature resistance of the EBT E_(PDM) compound were studied.The results showed that,compared with EPDM compounds,the t_(10) and t_(90) of EBT E_(PDM) compounds were shortened,and Fmax-FL increased.At low temperature conditions(-40℃×72 h),the compression set of EBT EPDM vulcanizates decreased by 71.5%,the brittleness temperature decreased by 37.7%,the low temperature retraction temperature TR10 was the lowest,and there were no cracks on the surface after low-temperature bending,demonstrating excellent low temperature resistance.With the increase of carbon black particle size,the low temperature compression set and brittleness temperature of EBT EPDM vulcanizate decreased.Under the same low temperature conditions,the compression set of EBT EPDM vulcanizate was similar to that of silicone rubber vulcanizate,but the price of EBT EPDM was much lower than that of silicone rubber,which could broaden its application in the field of low temperature sealing.
作者
苏春义
丁业乾
杨春
何培
柯玉超
田友峰
章维国
祝磊
吴晨
SU Chunyi;DING Yeqian;YANG Chun;HE Pei;KE Yuchao;TIAN Youfeng;ZHANG Weiguo;ZHU Lei;WU Chen(Anhui Zhongding Sealing Parts Co Ltd,Ningguo 242300,China)
出处
《橡胶科技》
CAS
2024年第1期15-19,共5页
Rubber Science and Technology
