通过碱性胺改性环氧和酸性丙烯酸共聚物的中和来稳定水性环氧树脂/丙烯酸树脂,ACS Applied Polymer Materials

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通过碱性胺改性环氧和酸性丙烯酸共聚物的中和来稳定水性环氧树脂/丙烯酸树脂
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-12-19 , DOI: 10.1021/acsapm.3c02424
Yu-Chi Chen, Ying-Chi Huang, Chien-Hsin Wu, Hsin-Wei Lin, Wen-Yen Chiu, Ru-Jong Jeng, Shih-Huang Tung

在这项工作中，通过改性环氧和丙烯酸共聚物的简单共混制备了一类稳定的高性能水性环氧/丙烯酸树脂。双酚A型环氧树脂用乙醇胺(ETA)进行末端改性，而丙烯酸共聚物则用甲基丙烯酸甲酯(MMA)、带有环氧化物的甲基丙烯酸缩水甘油酯(GMA)和带有羧酸的甲基丙烯酸(MAA)合成。改性环氧和丙烯酸共聚物的混合物的摩尔质量均高于10,000 g/mol且不溶于水，无需额外的分散剂即可成功乳化。关键是改性环氧树脂上的ETA为促进丙烯酸树脂上的羧酸在水中解离提供了基本条件，从而实现静电稳定。乳液粒径小于300 nm，储存9个月以上仍稳定。环氧/丙烯酸树脂可交联，具有良好的热性能，玻璃化转变温度（_Tg）_高达104.6℃，热降解温度（Td）高达330.4℃。对该树脂作为钢铁表面涂层的应用进行了论证，膜层具有良好的耐腐蚀性能，经5小时盐雾试验后，钢铁表面生锈面积小于5%。

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Waterborne Epoxy/Acrylic Resins Stabilized through the Neutralization of Basic Amine-Modified Epoxy and Acidic Acrylic Copolymers

In this work, a class of stable waterborne epoxy/acrylic resins with high performance is prepared through the simple blending of modified epoxy and acrylic copolymers. The bisphenol A-based epoxy resin is end-modified with ethanolamine (ETA) while the acrylic copolymers are synthesized with methyl methacrylate (MMA), glycidyl methacrylate (GMA) bearing epoxide, and methacrylic acid (MAA) bearing carboxylic acid. The mixtures of the modified epoxy and acrylic copolymers, both with molar masses above 10,000 g/mol and insoluble in water, can be successfully emulsified without additional dispersants. The key is that ETAs on the modified epoxy provide a basic condition to promote dissociation of the carboxylic acids on the acrylics in water, leading to the electrostatic stabilization. The particle size of the emulsions is less than 300 nm, and the emulsions are stable after storage for more than 9 months. The epoxy/acrylic resins are cross-linkable and show good thermal properties, with a high glass-transition temperature (T_g) up to 104.6 °C and a thermal degradation temperature (T_d) up to 330.4 °C. The application of the resins as the surface coating of steel was demonstrated, and the films exhibit a good corrosion resistance, less than 5% rusted area on the steel surface after 5-h salt spray test.

更新日期：2023-12-19

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