添加剂对硅橡胶耐高温性的影响
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摘要
以甲基乙烯基硅橡胶为生胶,添加白炭黑、结构化控制剂、乙烯基MQ(VMQ)硅树脂等制得混炼胶。研究了结构化控制剂种类及用量、VMQ硅树脂用量对热硫化硅橡胶耐高温性的影响。结果表明,当采用甲基苯基乙烯基硅油/六甲基二硅氮烷复配物作为结构化控制剂,且两者用量均为4份时,硅橡胶质量损失率5%时的温度为460℃。此外,添加5份VMQ硅树脂可以提高硅橡胶的热稳定性,最大热分解温度由565.8℃提高到580.9℃。较佳配方为:甲基乙烯基硅橡胶100份、气相法白炭黑40份、三氧化二铁10份、甲基苯基乙烯基硅油/六甲基二硅氮烷复配且用量均为4份、VMQ硅树脂5份、2,5-二甲基-2,5-双(叔丁基过氧基)己烷0.7份。
The rubber compound was prepared by with methyl vinyl silicone rubber,silica,structural control agent and VMQ silicone resin.The effects of the type and amount of structural control agent and the amount of VMQ silicone resin on the high temperature resistance of HTV silicone rubber were studied.Results showed that when using the compounds of methylphenyl vinyl silicone oil and hexamethyldisilazane as the structural control agent,and the amount ofboth compounds are 4 phr,the mass loss rate of silicone rubber was 5% at the temperature of 460℃.In addition,the thermal stability of silicone rubber was improved by adding 5phr VMQ silicone resin,and the maximum thermal decomposition temperature was increased from 565.8℃ to 580.9℃.The optimum formula was as follows:100 phr of methyl vinyl silicone rubber,40 phr of fumed silica,10 phr of ferric oxide,4 phr of both methyl phenyl vinyl silicone oil and hexamethyldisilazane,5 phr of VMQ silicone resin,and 0.7 phr of 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane.
The rubber compound was prepared by with methyl vinyl silicone rubber,silica,structural control agent and VMQ silicone resin.The effects of the type and amount of structural control agent and the amount of VMQ silicone resin on the high temperature resistance of HTV silicone rubber were studied.Results showed that when using the compounds of methylphenyl vinyl silicone oil and hexamethyldisilazane as the structural control agent,and the amount ofboth compounds are 4 phr,the mass loss rate of silicone rubber was 5% at the temperature of 460℃.In addition,the thermal stability of silicone rubber was improved by adding 5phr VMQ silicone resin,and the maximum thermal decomposition temperature was increased from 565.8℃ to 580.9℃.The optimum formula was as follows:100 phr of methyl vinyl silicone rubber,40 phr of fumed silica,10 phr of ferric oxide,4 phr of both methyl phenyl vinyl silicone oil and hexamethyldisilazane,5 phr of VMQ silicone resin,and 0.7 phr of 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane.
引文
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[2]石耀刚,雷卫华,张长生,等.热硫化硅橡胶泡沫材料的制备技术[J].有机硅材料,2008,22(6):373-376.
[3]BANHART J.Manufacture,characterisation and application of cellular metals and metal foams[J].Prog Mater Sci,2001,46(6):559-632.
[4]沙艳松,张长生,罗世凯.硅橡胶耐热性能的研究进展[J].有机硅材料,2012,26(2):122-126.
[5]LUCAS G M.Room temperature vulcanizable silicone compositions:US,5213899[P].1993-05-25.
[6]SOHONI G B,MARK J E.Thermal stability of in situ filled siloxane elastomers[J].J Appl Polym Sci,1992,45(10):1763-1775.
[7]张旭文.耐高温无卤阻燃硅橡胶的研究[D].广州:华南理工大学,2011.
[8]魏伯荣,黄峰.硅树脂对硅橡胶耐热性能的影响[J].弹性体,2000,10(3):5-7.
[9]彭文庆,谢择民.高热稳定性硅橡胶的研究[J].高分子通报,2000(1):1-8.
[10]孙希路,刘春霞,许鑫江,等.耐高温硅橡胶的研究进展[J].有机硅材料,2018,32(1):66-70.
[11]ZHAO S G,FENG S Y.Hydrogen-containing silicone resin as the crosslinking agent of heat-curable silicone rubber[J].J Compos Mater,2008,42(2):173-187.