高柔性及耐溶剂型硅橡胶的研制  

Development of Silicone Rubber with High Flexibility and Solvent Resistance

作　　者：殷小龙 丁梦汝 蒋珊珊 闵洁[1] YIN Xiaolong;DING Mengru;JIANG Shanshan;MIN Jie(Donghua University,Shanghai 201600,China)

机构地区：[1]东华大学化学化工与生物工程学院,上海201600

出　　处：《橡胶工业》2020年第6期427-433,共7页China Rubber Industry

摘　　要：采用乙烯基聚二甲基硅氧烷(乙烯基硅油)为基础聚合物、含氢聚二甲基硅氧烷(含氢硅油)为交联剂、异丙醇配位的氯铂酸为催化剂制备加成型液体硅橡胶,研究含氢硅油中Si-H与乙烯基硅油中Si-Vi(乙烯基)的物质的量比(A)以及含氢硅油中活性氢质量分数(ω)对硅橡胶力学性能的影响;分别添加外增塑剂二甲基聚二甲基硅氧烷(二甲基硅油)和内增塑剂甲基丙烯酸十八烷基酯,研究增塑剂种类和用量对硅橡胶力学性能和耐溶剂性能的影响。结果表明:硅橡胶的压缩模量随着A的增大先增大后减小,随着ω的增大而增大,当A=1. 50,ω=0. 010 0时硅橡胶的压缩模量较大;加入增塑剂后,硅橡胶的压缩模量随着增塑剂质量分数的增大而减小,在添加同等质量分数的情况下,内增塑剂的增塑效果优于外增塑剂,内增塑型硅橡胶的耐溶剂性能优于外增塑型硅橡胶;当A=1. 05,ω=0. 003 6,内增塑剂质量分数为0. 40时,可以制得具有高柔性及优良耐溶剂性能的硅橡胶。The addition-cure type liquid silicone rubber was prepared by using vinyl polydimethylsiloxane as basic polymer,hydride functional polydimethylsiloxane as crosslinking agent and isopropanol coordinated chloroplatinic acid as catalyst.The effects of the molar ratio(A)of Si—H in hydride functional polydimethylsiloxane to Si—Vi(vinyl group)in vinyl polydimethylsiloxane and the active hydrogen content in hydride functional polydimethylsiloxane(ω)on the mechanical properties of silicone rubber were studied.The influence of the type and amount of plasticizer on the mechanical properties and solvent resistance of silicone rubber was also investigated,and two plasticizers were studied:external plasticizer dimethyl polydimethylsiloxane and internal plasticizer octadecyl methacrylate.The results showed that,the compression modulus of silicone rubber increased first and then decreased with the increase of A,and it increased with the increase ofω.When A=1.50,andω=0.0100,the compression modulus was high.The compression modulus of silicone rubber decreased with the increase of the mass fraction of plasticizer.At the same mass fraction,the plasticizing effect of internal plasticizer was better than that of external plasticizer,and the solvent resistance of the silicone rubber with internal plasticizer was better than that with external plasticizer.When A=1.05,ω=0.0036,and the mass fraction of internal plasticizer was 0.40,silicone rubber possessed high flexibility and good solvent resistance.

关 键 词：硅橡胶 乙烯基聚二甲基硅氧烷 含氢聚二甲基硅氧烷 增塑剂 力学性能 压缩模量 耐溶剂性能 

分 类 号：TQ333.93[化学工程—橡胶工业]