基于3-二甲氨基丙胺在水性脂环胺固化剂中的应用研究

Study on the Application of 3-dimethylaminopropylamine in Waterborne Alicyclic Amine Curing Agent

为了解决脂环胺在环氧固化剂中水性化的难点,以4,4'–二氨基二环己基甲烷(H12MDA)为基础胺,1,3–丙二胺(DMAPA)兼作亲水改性剂,与液体环氧树脂(NPEL-128)和聚乙二醇二缩水甘油醚(PEGDGE)合成水性环氧固化剂,同时设置对照组以二亚乙基三胺(DETA)作为亲水改性剂,探究了具有叔胺结构的1,3–丙二胺(DMAPA)对HMDA的亲水改性效果,优化了非离子亲水扩链剂聚乙二醇二缩水甘油醚(PEGDGE)的用量。结果表明,DMAPA的亲水性远高于二亚乙基三胺为代表的常规脂肪胺,所得固化剂黏度适中、水溶性良好,固化剂制备所得涂膜具有高硬度、高耐冲击性及优异的耐水、耐盐雾性能。

In order to solve the difficulty of hydrolyzation of alicyclic amine in epoxy curing agent,4,4'-diaminodicyclohexylmethane(H12MDA)as the base amine,1,3-propylenediamine(DMAPA)as a hydrophilic modifier was synthesized with liquid epoxy resin(NPEL-128)and polyethylene glycol diglycidyl ether(PEGDGE)into a waterborne epoxy curing agent.At the same time,the control group was set up with diethylenetriamine(DETA)as a hydrophilic modifier,the hydrophilic modification effect of 1,3-propylenediamine(DMAPA)with tertiary amine structure on HMDA was investigated,and the dosage of nonionic hydrophilic chain extender polyethylene glycol diglycidyl ether(PEGDGE)was optimized.The results showed that the hydrophilicity of DMAPA was much higher than that of the conventional fatty amines represented by diethylenetriamine,and the obtained curing agent had moderate viscosity and good water solubility.The film prepared by the curing agent had high hardness,high impact resistance and excellent water and salt spray resistance.