LSR用含氢MQ硅树脂型增粘剂的合成与表征

Synthesis and Characterization of Hydrogen MQ Silicone Resin-based Tackifier for LSR

以含氢MQ硅树脂(HMQ)和1,6-己二醇二丙烯酸酯(HDDA)为原料,通过硅氢加成反应合成了含氢MQ硅树脂型增粘剂(HMQ-g-HDDA),并配制成加成型液体硅橡胶(LSR)胶粘剂,用于LSR硫化胶与聚碳酸酯(PC)基材的粘接。通过傅里叶变换红外光谱对HMQ-g-HDDA的结构进行表征,并研究了反应温度、反应时间、铂催化剂用量及HDDA与HMQ的配比对HMQ-g-HDDA收率、运动黏度及增粘作用的影响。结果发现,当HDDA二次加成反应程度较大时,HMQ-g-HDDA的运动黏度显著提高,增粘作用明显降低。当反应温度为80℃、反应时间为3 h、铂质量分数为2×10-6、HDDA中的乙烯基和HMQ中的硅氢基的量之比为2.0时,HMQ-g-HDDA的收率为77.6%,运动黏度(25℃)为8.19 mm2/s,对LSR胶粘剂具有良好的增粘作用。加有HMQ-g-HDDA的LSR胶粘剂用于LSR硫化胶与PC基材之间的粘接时,其180°剥离强度为5.45 kN/m,比空白样(0.1 kN/m)提高了54.5倍。

A novel type of hydrogen MQ silicone -cure liquid silicone rubber （LSR） was synthesized resin-based by grafting tackifier （ HMQ - g - HDDA） for addition 1,6 - hexanediol diacrylate （HDDA） onto hydrogen MQ silicone resin （HMQ） via hydrosilylation. HMQ - g - HDDA was applied to prepare LSR adhe- sive for enhancing the adhesive performance between vulcanized addition -curable liquid silicone rubber （VLSR） and polycarbonate （PC） substrate. The chemical structure of HMQ-g- HDDA was characterized by Fourier transform infrared spectroscopy （FTIR）. The effects of the synthesis conditions on the yield, kine- matic viscosity and adhesion promoting performance were investigated. Results show that when the secondary addition reaction of HMQ -g -HDDA exceeds a certain extent, the kinematic viscosity significantly increase, leading to an obvious decrement of adhesion promoting performance. The optimal reaction temperature, reac- tion time, mass fraction of platinum and n（CH2=CH）/n（Sill） （molar ratio of vinyl groups in HDDA and ac- tive hydrogen groups in HMQ） were 80 ℃, 3 h, 2 × 10 ^-6, and 2.0, respectively. Under the optimal reaction condition, the yield of HMQ - g - HDDA is 77.6% ; the kinematic viscosity （25 ℃ ） of HMQ - g - HDDA is 8. 19 mm^2/s. The obtained HMQ - g - HDDA shows an excellent adhesion promoting property with the 180° peel strength of 5.45 kN/m, which is 54. 5 times higher than that of LSR without HMQ -g - HDDA （0. 1 kN/m）.