Development of high performance two-component epoxy casting adhesive
A high performance two-component epoxy casting adhesive with high shear strength and good medium resistance was prepared by using bisphenol A-type epoxy resin as the base material,four types of curing agents including phenolic amine,combined with efficient accelerator(DMP-30),iron powder,and other fillers.The effects of epoxy resin,curing agent,accelerator,and iron powder on the properties of casting adhesive were investigated.The research results showed that,(1)As the mass fraction of epoxy resin E-44 increased,the viscosity of the mixed adhesive solution continued to increase,the curing time gradually shortened,and the shear strength first increased and then decreased with the increase of E-44 content.The shear strength reached its maximum at a mass fraction of 40%.It was determined in this study that the epoxy resin was mainly mixed with E-44 and E-51,and the mass fraction of E-44 was relatively optimal at 40%.(2)Under the condition of constant dosage of other components,the effects of four types of curing agents,namely cyclic amine,polyamide,phenolic amine and polythiol on the curing time,hardness and shear strength of the adhesive solution were investigated,and the effects of curing agents on the medium resistance of the adhesive solution were also examined.The research results indicated that phenolic amine was chosen as the curing agent.(3)As the addition amount of accelerator DMP-30 increased,the curing time of the adhesive solution gradually shortened,the hardness gradually increased,and the shear strength first increased and then decreased.It was determined in this study that the relatively optimal addition amount of DMP-30 was 4%.(4)With the increase of the addition amount of three types of iron powder(600,800,1 250 mesh),the shear strength of the adhesive solution first increased and then decreased.Among them,1 250 mesh iron powder had the most significant effect on improving the shear strength of the adhesive solution,and reached its peak at an addition amount of 50%,with the highest shear strength reaching 29 MPa.It was determined in this study that the mesh size of iron powder was 1 250 and the addition amount was 50%.
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