摘要
采用双酚A型环氧树脂、聚氨酯改性环氧树脂或CTBN改性环氧树脂等作为树脂原料,加入双氰胺、取代脲、碳酸钙、气相二氧化硅等助剂制成环氧胶粘剂.探索了不同种类环氧树脂(E-44、E-51、PUEP-A、PUEP-B、CTBN改性环氧树脂)对冷轧钢、5052铝合金、6061铝合金等不同金属基材的粘接性,并开发出力学性能和粘接性能良好的单组分环氧树脂胶粘剂.研究结果表明:(1)双酚A型环氧树脂对金属基材粘接性较差,而改性环氧树脂(聚氨酯改性环氧树脂或CTBN改性环氧树脂)的加入可改善粘接性;(2)存在某个改性环氧树脂含量使得胶粘剂的内聚强度与对基材的粘接强度相当,此时胶粘剂的粘接性和力学强度达到平衡,粘接表现最佳;(3)使用正交试验法确定E-51、PUEP-A、PUEP-B、CTBN改性环氧树脂的质量比为2∶1∶1∶1时,胶粘剂表现相对最佳.
Abstract
Epoxy adhesive was prepared by using bisphenol A-type epoxy resin,polyurethane modified epoxy resin,or CTBN modified epoxy resin as resin raw materials,and adding additives such as dicyandiamide,substituted urea,calcium carbonate,and fumed silica.The adhesion of different types of epoxy resin(E-44,E-51,PUEP-A,PUEP-B,CTBN modified epoxy resin)to different metal substrates such as cold-rolled steel,5052 aluminum alloy,6061 aluminum alloy was explored,and one-component epoxy resin adhesive with good mechanical and bonding properties was developed.The research results showed that,(1)Bisphenol A-type epoxy resin had poor adhesion to metal substrates,while the addition of modified epoxy resin(polyurethane modified epoxy resin or CTBN modified epoxy resin)could improve adhesion.(2)There existed a modified epoxy resin content that made the cohesive strength of the adhesive equivalent to the bonding strength to the substrate.At this point,the adhesive's adhesion and mechanical strength reached a balance,and the bonding performance was the best.(3)The orthogonal experimental method was used to determine that the adhesive exhibited the best performance when the mass ratio of E-51,PUEP-A,PUEP-B,and CTBN modified epoxy resin was 2∶1∶1∶1.
维普
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