Most waterborne epoxy resin emulsifiers are inactive, and the free emulsifier will precipitate out during the curing of the coating film, which will seriously affect the water resistance, solvent resistance, and hardness of the coating film. Herein we prepared a new type of nonionic active epoxy emulsifier. First, 1,4-butanediol diglycidyl ether reacts with polyethylene glycol at a higher temperature to form an epoxy-terminated modified hydrophilic segment. Then 2,4-toluene diisocyanate link the hydrophilic segment and the epoxy resin E-31 (according the reactivity of the hydroxyl group on the epoxy resin E-31) to obtain an emulsifier for emulsifying epoxy resins. The synthesized emulsifier's cloud point is 89°C and hydrophilic–lipophilic balance is about 13.1. The most suitable condition of the phase inversion is that the emulsification temperature is 60°C and the stirring speed is 1500 r min⁻¹. The coating films obtained from synthesized emulsifier is dense and uniform with excellent mechanical properties.

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非离子型水性环氧树脂的制备及性能

大多数水性环氧树脂乳化剂是惰性的，游离的乳化剂会在涂膜固化过程中析出，严重影响涂膜的耐水性、耐溶剂性和硬度。在此我们制备了一种新型的非离子活性环氧乳化剂。首先，1,4-丁二醇二缩水甘油醚在较高温度下与聚乙二醇反应形成环氧基封端的改性亲水链段。然后2,4-甲苯二异氰酸酯将亲水链段与环氧树脂E-31（根据环氧树脂E-31上羟基的反应性）进行连接，得到乳化环氧树脂的乳化剂。合成乳化剂的浊点为 89°C，亲水亲油平衡约为 13.1。^-1。合成乳化剂得到的涂膜致密均匀，具有优良的力学性能。