EPDM绝热层用过氧化物和硫磺硫化体系可挥发逸出物研究  

Study on Volatiles Emission of Peroxides and Sulphur Curing Systems for EPDM Insulation

作　　者：张冶焘 王明超[1,2] 何永祝 郭珅荣[1] 陈雯 ZHANG Yetao;WANG Mingchao;HE Yongzhu;GUO Shenrong;CHEN Wen(Hubei Institute of Aerospace Chemical Technology,Xiangyang 441003;Laboratory of Emergency Safety and Rescue Technology,Xiangyang 441003)

机构地区：[1]湖北航天化学技术研究所,襄阳441003 [2]应急救生与安全防护湖北省重点实验室,襄阳441003

出　　处：《宇航材料工艺》2022年第5期74-81,共8页Aerospace Materials & Technology

基　　金：国家自然科学基金委员会—中国航天科技集团有限公司航天先进制造技术研究联合基金(U1837601)。

摘　　要：采用顶空气相色谱-质谱联用技术和热失重法研究了三元乙丙橡胶(EPDM)绝热层常用的过氧化物硫化体系和硫磺硫化体系对可挥发逸出物种类和含量的影响。结果表明,过氧化二异丙苯(DCP)的主要逸出产物是苯丙烯、苯乙酮和2-苯基-2-丙醇;1,3-二(叔丁基过氧化异丙基)苯(BIPB)的主要逸出产物为丙酮、叔丁醇和1,3-二乙酰基苯;2,5-二甲基-2,5-叔丁基过氧己烷(DBPH)的主要逸出产物是丙酮、叔丁醇、2-甲基-2-甲氧基丙烷和2,5-二甲基-2,5-己二醇。不同过氧化物体系硫化特性分析表明,BIPB在与DCP硫化程度相当时用量最少。相较于DCP、DBPH体系,BIPB简单硫化体系在80℃预烘时逸出物含量最低。过氧化物硫化体系与硫磺硫化体系逸出物含量分析表明,硫磺/二硫化四甲基秋兰姆/2-巯基苯并噻唑(S/TMTD/M)全配方体系80℃预烘时的逸出物含量明显低于其他三种过氧化物体系,预烘100 h失重率较DCP体系降低31.50%。过氧化物与硫磺体系硫化机理的不同及硫化剂用量的差异是影响EPDM绝热层可挥发逸出物含量及种类的主要因素。The effects of peroxide vulcanization system and sulphur vulcanization system commonly used in ethylene propylene diene monomer(EPDM)insulation on the types and content of volatiles are studied by headspace gas chromatography-mass spectrometry and thermogravimetric method. The results show that the main volatiles of dicumyl peroxide(DCP)are phenylpropene,acetophenone and 2-phenyl-2-propanol;the main volatiles of 1,3-bis(tert-butyl peroxide isopropyl) benzene(BIPB) are acetone、tert-butanol and 1,3-diacetylbenzene;the main volatiles of 2,5-dimethyl-2,5-tert-butyl peroxyhexane(DBPH) are acetone,tert-butanol,2-methyl-2-methoxypropane and 2,5-dimethyl-2,5-hexanediol. The analysis of vulcanization characteristics of different peroxide systems shows that the dosage of BIPB is the least when the degree of vulcanization is equal to DCP.Compared with DCP and DBPH systems,the content of volatiles of BIPB simple vulcanization system is the lowest when pre-baked at 80 ℃. The analysis of the content of volatiles of peroxide vulcanization systems and sulfur vulcanization system shows that the volatiles content of sulfur/tetramethylthiuram disulfide/2-mercaptobenzothiazole(S/TMTD/M)full formula system is significantly lower than that of other three peroxide systems when pre-baked at80 ℃,and the weight loss rate of pre-baked for 100 h is 31. 50% lower than that of DCP system. The difference of vulcanization mechanism between peroxide and sulfur systems and the difference of vulcanization agent dosage are the main factors affecting the content and types of volatiles emission in EPDM insulation.

关 键 词：EPDM绝热层 硫化 过氧化物 硫磺 可挥发性 

分 类 号：TU52[建筑科学—建筑技术科学]