高性能双组分环氧铸工胶的研制

Development of high performance two-component epoxy casting adhesive

选用双酚A型环氧树脂作为基料,酚醛胺等4种类型作为固化剂,配以高效促进剂(DMP-30)、铁粉及其他填料,制备出剪切强度高、耐介质性好的高性能双组分环氧铸工胶。重点考察了环氧树脂、固化剂、促进剂及铁粉对铸工胶性能的影响。研究结果表明:(1)随着环氧树脂E-44质量分数的增加,混合胶液的黏度不断提高,固化时间逐渐缩短,剪切强度随着E-44含量的增加先升后降,在质量分数为40%时剪切强度最大。本研究确定环氧树脂以E-44与E-51混合为主,E-44的质量分数在40%时相对最佳。(2)在其他组分用量不变的条件下,考察了脂环胺、聚酰胺、酚醛胺以及聚硫醇4种类型固化剂对胶液固化时间、硬度及剪切强度的影响,并考察了固化剂对胶液耐介质性的影响。研究结果表明,选用酚醛胺作为固化剂。(3)随着促进剂DMP-30添加量的增加,胶液的固化时间逐渐缩短,硬度逐渐变大,剪切强度则先增大后减小。本研究确定DMP-30的相对最佳添加量为4%。(4)随着3种(600、800、1250目)铁粉添加量的提升,胶液的剪切强度均先增大后减小,其中1250目铁粉提升胶液的剪切强度最为明显,并且在添加量为50%时达到峰值,最高剪切强度可达29MPa。本研究确定铁粉的目数为1250目,添加量为50%。

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(600,800,1250 mesh),the shear strength of the adhesive solution first increased and then decreased.Among them,1250 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 1250 and the addition amount was 50%.