新型加成型硫化硅橡胶的研究

STUDY ON NEW ADDITION TYPE CURABLE SILICONE RUBBER

以含环氧基聚二甲基硅氧烷为基胶，以胺类化合物为固化交联剂进行了新型加成型硫化硅橡胶的研究。实验结果表明，在基胶分子量为２×１０４～３×１０４，环氧链节数为１％时，采用脂肪胺ＴＥＰＡ、ＰＥＰＡ等以及７０３＃为固化剂，制备得到了具有一定机械力学强度的中温硫化硅橡胶。在基胶分子量约为５×１０５，环氧链节数为０．４％～０．５％时，以ＰＥＰＡ为固化交联剂，在１３０℃×４ｈ二段硫化工艺条件下，制备得到了拉伸强度为２．０～２．３ＭＰａ，邵氏硬度为４６～７６的高温硫化硅橡胶。

By using polydimethylsiloxane containing epoxy groups as base gum, the compounds containing amino groups as crosslinking reagent, a new addition type curable silicone rubber were prepared. The result show that when the molecular weight and the chain of epoxy group of the base gum were 2×10 4￣3×10 4, 1% respectively, TEPA, PEPA and 703 # were used as crosslinking reagent at 110 ℃×4 h, the tensile strength and the hardness Shore A of some vulcanizates can reach as high as 1.06 MPa and 45 respectively. When the molecular weight and the chain of epoxy group of the base gum were about 5×10 5, 0.4%￣0.5%, respectively, fatty amino PEPA were used as crosslinking reagent under 130 ℃×4 h two stage cure, the tensile strength and hardness Shore A of vulcanizates are 2.0￣2.3 MPa, 46￣76, respectively. In the meantime, this paper also deals with the mechanism of epoxy opening.