KH560改性双组分室温固化环氧结构胶的制备与性能

摘要

The prepolymer was synthesized by reaction of 3-Glycidyloxypropyltrimethoxysilane (KH560) and epoxy resin (EP).The effect of KH560 content on the performance of EP-modified polyamide structural adhesive curable at room temperature was systematically investigated by means of viscometer,universal electric material testing machine,FT-IR spectroscopy and differential scanning calorimetry.The results indicated that the mechanical properties of the modified room temperature curable epoxy adhesive were remarkly decreased after introducing 9 phr KH560.More specifically,the tensile strength and compressive strength were decreased from 51 MPa to 36.5 MPa and 79.7 MPa to 53 MPa,respectively.The bonding strength was improved with introducing KH560 into the epoxy network.When the addition amount of KH560 was 9 phr,the shear strength of joints was increased from 8.7 MPa to 11.7 MPa,and the thermal stability of the cured products was improved to some extent:the temperature for 50%weight loss of unmodified and KH560-modified EP cured products were 382.1℃and 403.6℃, respectively.%将γ-缩水甘油醚氧丙基三甲氧基硅烷（KH560）与环氧树脂（EP）预反应，采用黏度计、万能电子材料试验机、红外光谱、差示扫描量热仪，考查了KH560含量对EP/改性聚酰胺室温固化环氧结构胶性能的影响。结果表明，KH560含量从0增加至9质量份（每100份EP中加入量）时，胶体拉伸强度从51 MPa降低至36.5 MPa；压缩强度从79.7 MPa降低至53 MPa；粘接强度从8.7 MPa增至11.7 MPa。同时，固化物的热稳定性也有一定程度提高，未改性及9份KH560改性的EP固化物50%热失重的温度分别为382.1℃与403.6℃。