促进剂种类及炭黑用量对氯丁橡胶性能的影响

Effects of Accelerator Type and Carbon Black Content on Properties of CR

研究促进剂种类及炭黑用量对氯丁橡胶(CR)性能的影响。结果表明:N,N′-二乙基硫脲(简称二乙基硫脲)胶料的t10最短,四甲基硫脲胶料最长;二乙基硫脲胶料的t90最短,1,2-亚乙基硫脲(简称亚乙基硫脲)和四甲基硫脲胶料均较长;二乙基硫脲胶料的硫化程度最高,N,N,N′-三甲基硫脲(简称三甲基硫脲)和四甲基硫脲胶料均较低;亚乙基硫脲胶料的100%定伸应力最大,拉断伸长率最小,四甲基硫脲胶料的100%定伸应力最小,拉断伸长率最大;三甲基硫脲胶料的压缩永久变形最小;通过减小炭黑N550用量,可以降低胶料的门尼粘度和硬度;热重分析的温度达到298℃时,CR的碳-氯键开始分解。

The effects of accelerator type and carbon black content on the properties of chloroprene rubber(CR)were studied.The results showed that the t10 of the compound with N,N′-diethyl thiourea(diethyl thiourea for short)was the shortest,while that of the compound with tetramethyl thiourea was the longest.The t90 of the compound with diethyl thiourea was the shortest,while that of the compound with 1,2-ethylidene thiourea(ethylidene thiourea for short)or tetramethyl thiourea was longer.The vulcanization degree of the compound with diethyl thiourea was the highest,while that of the compound with N,N,N′-trimethyl thiourea(trimethyl thiourea for short)or tetramethyl thiourea was lower.The modulus at 100%elongation of the compound with ethylidene thiourea was the highest,and the elongation at break was the lowest.The modulus at 100%elongation of the compound with tetramethyl thiourea was the lowest,and the elongation at break was the highest.The compression set of the compound with trimethyl thiourea was the smallest.The Mooney viscosity and hardness of the compound could be reduced by decreasing the content of carbon black N550.When the temperature of thermogravimetric analysis reached 298℃,the C—Cl bond of CR began to decompose.