基于1,3-环己二甲胺水性环氧固化剂的合成与性能

Preparation and Properties of 1,3-BAC-based Waterborne Epoxy Curing Agent

以1,3-环己二甲胺(1,3-BAC)和三乙烯四胺(TETA)作为基础胺,聚乙二醇二缩水甘油醚(PEGDGE)、环氧树脂(E51)为扩链剂,正丁基缩水甘油醚(BGE)为封端剂,合成1,3-BAC水性环氧固化剂。探讨了最佳的反应条件,采用红外光谱(FT-IR)、差示扫描量热仪(DSC)对水性环氧固化剂进行了分析与表征,并考察了水性环氧固化剂的固化性能。结果表明:合成了1,3-BAC水性环氧固化剂;DSC表明水性环氧固化剂与环氧树脂E51固化时,其表观活化能△E低于60 kJ/mol,具有室温固化特性。在活泼氢与环氧基物质的量比为1.1∶1时,固化7 d后涂膜硬度2H,附着力1级,柔韧性1 mm,室温浸水240 h漆膜表观完好,耐酸碱性优异。

The 1,3-BAC-based waterborne epoxy curing agent was synthesized by using1,3-cyclohexanebis(methylamine)(1,3-BAC)and triethylenetetramine(TETA)as basic amines,polyethylene glycol diglycidyl ether(PEGDGE),epoxy resin(E51)as chain extenders and butyl glycidyl ether(BGE)as blockers.The compound was analyzed and characterized by FT-IR and differential scanning calorimetry(DSC)to establish the optimum reaction conditions,and the curing performance of compound were investigated.The FT-IR results showed that the 1,3-BAC based waterborne epoxy curing agent was synthesized successfully.The curves of DSC showed that when E51 was cured with the waterborne epoxy curing agent,the apparent activation energy ΔE was lower than 60 k J/mol,indicating a curing capability at room temperature.When the molar ratio of active hydrogens and epoxy groups was 1.1∶1,after curing for 7 days the coatings 2 H hardness,grade1 adhesion,1 mm flexibility,the paint film appeared intact after soaking in water at room temperature for 240 h,and excellent acid/alkali resistance properties.