华南理工大学学报(自然科学版) ›› 2013, Vol. 41 ›› Issue (2): 123-128.doi: 10.3969/j.issn.1000-565X.2013.02.020

• 材料科学与技术 • 上一篇    下一篇

MQ硅树脂制备工艺对RTV硅橡胶补强效果的影响

梁银杏 郭鹏 任碧野 童真   

  1. 华南理工大学 材料科学研究所,广东 广州 510640
  • 收稿日期:2012-05-24 修回日期:2012-09-26 出版日期:2013-02-25 发布日期:2013-01-05
  • 通信作者: 童真(1956-),男,教授,博士生导师,主要从事功能高分子材料研究 E-mail:mcztong@scut.edu.cn
  • 作者简介:梁银杏(1982-),女,博士生,主要从事有机硅材料研究.E-mail:ginkgo0702@163com
  • 基金资助:

    国家“973”计划项目(2012CB821504)

Efects of Preparation Process of MQ Silicone Resin on Reinforcement of RTV Silicone Rubber

Liang Yin-xing Guo Peng Ren Bi-ye Tong Zhen   

  1. Research Institute ofMaterials Science,South China University ofTechnology,Guangzhou 510640,Guangdong,China
  • Received:2012-05-24 Revised:2012-09-26 Online:2013-02-25 Published:2013-01-05
  • Contact: 童真(1956-),男,教授,博士生导师,主要从事功能高分子材料研究 E-mail:mcztong@scut.edu.cn
  • About author:梁银杏(1982-),女,博士生,主要从事有机硅材料研究.E-mail:ginkgo0702@163com
  • Supported by:

    国家“973”计划项目(2012CB821504)

摘要: 以六甲基二硅氧烷、1,3-二乙烯基-1,1,3,3-四甲基二硅氧烷和正硅酸乙酯为原料,通过水解缩合反应制备了乙烯基MQ硅树脂(M为R3SiO1/2,Q为SiO4/2),考察了聚合条件对产物性能的影响.以该MQ硅树脂为填料,端乙烯基聚二甲基硅氧烷(PVMS)为基础聚合物,聚甲基氢硅氧烷为交联剂,在铂催化剂催化下硫化成型,获得乙烯基MQ硅树脂增强的加成型室温硫化(RTV)硅橡胶,探讨了制备工艺对硫化硅橡胶力学性能和透明性的影响.结果表明:当盐酸浓度为4.0% 、乙醇浓度为1.6%、M/Q摩尔比为0.75时,所制得的MQ硅树脂的补强效果较好;当PVMS/MQ硅树脂质量比为1,si-H和si-Vi摩尔比为1.4、催化剂含量为10μg/g、抑制剂含量为0.3mg/g时,所制得的硫化硅橡胶的拉伸强度可达7.2 MPa,并具有很好的透明性,说明MQ硅树脂的增强作用明显.

关键词: MQ硅树脂, 室温硫化, 硅橡胶, 补强

Abstract:

Vinyl MQ silicone resin(M and Q respectively represent R3SiO1/2 and SiO4/2)was synthesized via the hydrolytic condensation of hexamethyldisiloxane,1,3-divinyl-1,1,3,3 tetramethyldisil0xane and tetraethyl orthosi-licate,and the effects of polymerization conditions on the properties of the product were investigated.Then,a series of room-temperature vulcanizing(RTV)silicone rubbers reinforced with vinyl MQ silicone resin were prepared from vinyherminated polydimethylsiloxane(PVMS)cured with organohydrogenpolysiloxane under the catalysis of Pt cata-lyst.Finally,the effects of the preparation process on the mechanical properties and transparency of the cured sili-cone rubbers were investigated.The results show that the synthesized MQ silicone resin is of the best reinforcement effeet when HCl and ethanol contents are respectively 4.0% and 1.6% and when the M/Q molar ratio is 0.75,and that,when the mass ratio of PVMS to MQ silicone resin is 1,the molar ratio of Si-H to Si-Vi is 1.4,the catalyst dosage is 10μg/g and the inhibitor dosage is 0.3 m/g,the cured silicone rubbers are of a tensile strength being up to 7.2 MPa and of excellent transparency owing to the reinforcement of MQ silicone resin.

Key words: MQ silicone resin, room temperature vulcanization, silicone rubber, reinforcement

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