中国胶粘剂

以氯丁橡胶(CR)、甲基丙烯酸羟乙酯(HEMA)、过氧化二苯甲酰(BPO)、甲苯和乙酸乙酯等为原料,制备了HEMA接枝氯丁橡胶溶液;然后在接枝氯丁橡胶溶液中,加入叔丁基酚醛树脂-氧化镁螯合型化合物、氧化锌、防老剂和多亚甲基多苯基多异氰酸酯(PAPI)等混配制得氯丁橡胶胶粘剂。着重研究了引发剂BPO用量对氯丁橡胶溶液黏度、分子量、接枝率的影响,以及PAPI用量对氯丁橡胶胶粘剂在常温和100℃下拉伸剪切强度的影响。研究结果表明:随着BPO用量的增加,氯丁橡胶溶液的黏度和分子量逐渐减小,而HEMA接枝氯丁橡胶溶液的黏度和接枝率均呈现先增后减的趋势;当BPO用量为0.4份时,HEMA接枝氯丁橡胶溶液的黏度相对最大(3 050 m Pa·s)、接枝率最高(10.2%);当PAPI用量为5份时,氯丁橡胶胶粘剂在室温和100℃下的拉伸剪切强度均相对最大,分别达到了2.41和1.88 MPa。

The hydroxyethyl methacrylate(HEMA) grafted chloroprene rubber solution was prepared with chloroprene rubber(CR),HEMA,benzoyl peroxide(BPO),toluene and ethyl acetate as raw materials.Then,the chloroprene rubber adhesive was prepared by adding tert-butyl phenolic resin-magnesium oxide chelating compound,zinc oxide,antioxidant and poly aryl polymethylene isocyanate(PAPI) into the graft chloroprene rubber solution.The effects of BPO amount on the viscosity,molecular weight and grafting rate of chloroprene rubber solution,and the effects of PAPI amount on the tensile shear strength of chloroprene rubber adhesive at room temperature and 100 ℃were studied emphatically.The research results showed that with the increase of BPO content,the viscosity and molecular weight of chloroprene rubber solution decreased gradually,while the viscosity and grafting rate of HEM A grafted chloroprene rubber solution increased at first and then decreased.When the BPO amount was 0.4 phr,the viscosity of HEM A grafted chloroprene rubber solution was relatively the highest(3 050 mPa·s)and the grafting rate was also the highest(10.2%).When the PAPI amount was 5 phr,the tensile shear strength of chloroprene rubber adhesive at room temperature and 100 ℃was relatively high,and reached 2.41 and 1.88 MPa,respectively.