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作 者:程安仁 陆永俊 矫阳 郭月莹 CHENG An-ren;LU Yong-jun;JIAO Yang;GUO Yue-ying(Beijing Research Centre for Radiation Application Co Ltd/Beijing Key Laboratory of Radiation Advanced Materials,Beijing 100015,China;Xingyuan Certification Center Co Ltd,Beijing 100085,China)
机构地区:[1]北京市科学技术研究院,北京市射线应用研究中心有限公司/辐射新材料北京市重点实验室,北京100015 [2]兴原认证中心有限公司,北京100085
出 处:《合成橡胶工业》2023年第3期210-214,共5页China Synthetic Rubber Industry
摘 要:制备了具有不同共混比的天然橡胶(NR)/三元乙丙橡胶(EPDM)共混胶,对NR/EPDM热硫化胶进行应力-应变测试,筛选出热硫化过程中共硫化问题最严重的共混胶,采用辐照交联技术对其进行不同辐射吸收剂量的辐射处理,优选出最佳辐射吸收剂量;在最佳辐射吸收剂量下将不同共混比的NR/EPDM热硫化胶进行辐射处理,并对辐射处理前后共混胶的性能进行对比分析。结果表明,当NR和EPDM的质量比为40/60时NR/EPDM热硫化胶的综合力学性能最差;当辐射吸收剂量为100 kGy时,NR/EPDM共混胶的综合性能最佳,经辐射处理后不同共混比NR/EPDM共混胶的100%定伸应力均得到提高且提升幅度无显著差别;不同共混比NR/EPDM的共混胶经辐射处理后的拉伸强度和扯断伸长率曲线均由辐射处理前的类“U形”变为近似直线;辐射处理后NR/EPDM共混胶的扯断伸长率均下降,EPDM相的扯断伸长率下降幅度比NR相大。Natural rubber(NR)/ethylene-propylene-diene rubber(EPDM)blends with different blending ratios were prepared,the heat-vulcanized NR/EPDM vulcaniztes were analyzed by the stress-strain test,the blend with the most serious co-vulcanization problem in the process of heat-vulcanization was selected for radiation processing with diffe-rent radiation absorption dose by radiation cross-linking technology,and the optimal radiation absorption dose was preferred.Radiation treatment of the heat-vulcanized NR/EPDM vulcaniztes with different blending ratios was carried out with the optimal absorption dose,and the properties of the heat-vulcanized NR/EPDM vulcaniztes before and after radiation treatment were compared.The results showed that the comprehensive mechanical properties of the heat-vulcanized NR/EPDM vulcanizte were the worst when the mass ratio of NR to EPDM was 40/60;when the radiation absorption dose was 100 kGy,the comprehensive mechanical properties of NR/EPDM blends were the best,and modulus at 100%of NR/EPDM blends with different blending ratios all increased and there was no significant difference in the magnitude of the increase in modulus at 100%of NR/EPDM blends with different blending ratios after radiation treatment;the curves of tensile strength and elongation at break of NR/EPDM blends with different blending ratios all changed from the“U-shaped”before radiation treatment to the approximate linear after radiation treatment;after radiation treatment elongation at break of NR/EPDM blends all decreased and the magnitudes of the increase in elongation at break of EPDM phase were larger than those of NR phase in NR/EPDM blends.
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