氯化丁基橡胶/天然橡胶共混物性能的研究

研究了共混比及硫化体系对氯化丁基橡胶（ＣＩＩＲ）／天然橡胶（ＮＲ）共混物性能的影响，探讨了老化温度及防老剂对氧化锌／促进剂ＴＭＴＤ／促进剂ＤＭ硫化体系硫化的ＣＩＩＲ／ＮＲ共捐物耐热氧老化性能的影响。试验结果表明，氧化锌／促进剂ＴＭＴＤ／促进剂ＤＭ（５．０／１．５／１．０）硫化体系硫化的ＣＩＩＲ／ＮＲ共混物的拉伸强度和扯断伸长率与按共混比计算的平均值差别较小，尤其是拉伸强度与计算值完全一致。当共混物中ＣＩＩＲ用量超过５０份时，共混物的耐热氧老化性能明显改善。不同防老剂对ＣＩＩＲ／ＮＲ（５０／５０）共混物热氧老化的防护效能大小顺序为ＲＤ及４０１０＞４０１０ＮＡ＞ＭＢ＞Ｄ。防老剂ＲＤ先加入到ＮＲ中后再与ＣＩＩＲ共混．其防护效能更佳。

Study on Properties of CIIR/NR Blend

The influence of the blend ratio and the curing system on the properties of CIIR/NR blend was studied and the influence of the temperature during ageing and the antioxidant on the heat-oxygen age stability of CIIR/NR blend cured with ZnO/TMTD/MBTS was discussed. The test results showed that not much difference between the measured tensile strength and elongation at break and the calculated ones based on the blend ratio was found for the CIIR/NR blend cured with ZnO/TMTD/MBTS (5. 0/1. 5/1. 0).When the content of CIIR exceeded 50 phr,the heat-oxygen age stability of the blend would be significantly improved. The order of the heat-oxygen age stability provided by various antioxidants to the CIIR/NR (50/50) blend was as follows: RD> 4010NA >MB>D. The protective efficiency would be better when RD was added into NR before NR was blended with CIIR.