EPDM/CR共混物的研究

Study on EPDM/CR Blend

研究了橡胶共混比、硫化体系、高耐磨炭黑用量及共混工艺等对ＥＰＤＭ／ＣＲ共混物性能的影响，考察了共混物的力学性能、耐高温硝酸性能、热空气老化性能、耐辐射性能和相容性。试验结果表明，采用炭黑全部加入ＥＰＤＭ中然后与ＣＲ混合的共混工艺，所得硫化胶的力学性能超过两种橡胶硫化胶力学性能的加和值；共混胶中ＥＰＤＭ采用硫黄硫化才能得到比较好的力学性能。硫化动力学研究表明ＣＲ的硫化速度较ＥＰＤＭ的硫化速度对温度的依赖性小。ＤＳＣ和ＤＶＡ分析结果表明共混胶具有两个明显的玻璃化转变温度，为热力学不相容体系。研制的ＥＰＤＭ／ＣＲ共混物具有耐老化、耐高温硝酸、耐辐射、粘合好等优良性能。

The effects of blending ratio,curing system,HAF content and mixing technology on the properties of EPDM/CR blends were studied.The physical properties,hot nitric acid resistance,hot air aging property,radiation resistance and compatibility of the blends were investigated.The test results showed that the physical properties of the blend vulcanizate surpassed the additive physical properties of two rubber vulcanizates when EPDM was mixed with all black and then blended with CR;the good physical properties could be obtained only when EPDM in the blend was cured with sulfur.The study on vulcanization kinetics revealed that the dependence of vulcanization rate of CR on the temperarure was less than that of EPDM.The results from DSC and DVA analysis showed that the blend possessed two distinguished glass transition temperatures and was a thermomechanically incompatible system.The developed EPDM/CR blend featured good aging property,hot nitric acid resistance,radiation resistance and adhesion.