磺酸盐型水性环氧固化剂的合成与表征

采用丁基缩水甘油醚(n-BGE)和苄基缩水甘油醚(BGE)与二乙烯三胺(DETA)反应得到DETA的单封端产物,将产物与氨基磺酸盐(DETA-SO3Na)混合后再与环氧树脂(E-51)反应合成含多亚胺和磺酸盐的新型水性环氧固化剂,该固化剂与E-51复配得到双组分水性环氧涂料。采用红外光谱表征了固化剂结构,研究了氨基磺酸盐用量对双组分环氧涂料粒径及其涂膜性能的影响。结果表明,当配方为n(DETA-n-BGE)+n(DE-TA-BGE)+n(DETA-SO3Na)]∶n(E-51)=2∶1,DETA-SO3Na质量分数为5.6%,n-BGE与BGE物质的量比为3∶2时,制得的双组分环氧涂料具有较小的粒径(790 nm)和良好的稳定性(1.5 h),固化后涂膜铅笔硬度可达2 H,柔韧性1 mm,耐冲击性55(kg.cm-1),耐水性180 h。

Synthesis and characterization of aqueous epoxy curing agent based on sulphonate

The single-terminated DETA was obtainded by the reaction of butyl glycidyl ether(n-BGE) and benzyl glycidyl ether(BGE) with diethylene triamine(DETA).The product was mixed with sulphamate(DETA-SO3Na) and then the mixture reacted with epoxy resin(E-51) to synthesis novel aqueous epoxy curing agent containing multi-imine and sulfonates.The two-component aqueous epoxy coating was prepared by the curing agent and E-51.The structure of the synthesized curing agent was characterized by FT-IR.The effect of DETA-SO3Na amount on the particle size and properties of the cured two-component coating film were studied.The result showed that the optimum formula was as followed:n(DETA-n-BGE)+n(DETA-BGE)+n(DETA-SO3Na)]∶ n(E-51)=2∶ 1,ω(DETA-SO3Na)=5.6%,n(n-BGE)∶ n(BGE)=3∶ 2.The two-component coating has small particle size(790 nm)and good stability(1.5 h).The pencil hardness,flexibility,impact resistance and water resistance of the cured film was 2 H,1 mm,55 kg/cm and 180 h,respectively.