有机硅压敏胶用VMDQ型硅树脂的制备与性能

Preparation and properties of VMDQ type silicone for organosilicon pressure sensitive adhesive

以四甲基二乙烯基二硅氧烷、二甲基二甲氧基硅烷和四甲氧基硅烷为反应原料,氢氧化钾(KOH)为催化剂,采用碱催化水解共聚法制备VMDQ型硅树脂,并采用FT-IR(红外光谱)法、1H-NMR(核磁共振氢谱)法和29Si-NMR(核磁共振硅谱)法证实了产物的结构与目标分子结构相吻合;然后以VMDQ型硅树脂作为基体树脂,制备相应的SPSA(有机硅压敏胶)。研究结果表明:采用单因素试验法优选出制备SPSA的最佳工艺条件是n(硅树脂中乙烯基)∶n(硅树脂)=0.003 2∶100、M/Q值为0.7和n(含氢硅油中SiH)∶n(硅树脂中SiCH=CH2)=0.4∶1,此时SPSA的持粘力为26 526 s、180°剥离强度为0.58 kN/m且拉伸剪切强度为14.5 MPa。

With divinyltetramethyldisiloxane,dimethyldimethoxysilane and tetramethoxysilane as raw materials for reaction, potassium hydroxide（KOH ） as catalyst, a VMDQ type silicone was prepared through hydrolysis copolymerization catalyzed by alkali,and the same structures of product and target molecular were confirmed by FT-IR （infrared spectrum）, IH-NMR （nuclear magnetic resonance hydrogen spectrum） and 29Si-NMR （nuclear magnetic resonance silicon spectrum） methods. Then,with VMDQ type silicone as matrix resin,the corresponding SPSA（organosilicon pressure sensitive adhesive） was prepared. The research results showed that the optimal process conditions of preparing SPSA were preferred by single-factor experiment method when molar ratio of n（vinyl in silicone） ：n （silicone） was 0.003 2：100, M/Q value was 0.7, and molar ratio of n （Sill in containing hydrogen silicon oil）：n（SiCH=CH2 in silicone） was 0.4：1 ,here,the SPSA＇hold and tensile shear strength was 14.5 MPa. tack was 26 526 s, 180 °peeling strength was 0.58 kN/m,