水在环氧大豆油改性环氧树脂涂层中的扩散性能

Diffusion Properties of Water in Epoxy Coating Modified by Epoxidized Soybean Oil

在双酚A环氧树脂(DGEBA)-改性二乙烯三胺(DETA)体系中加入环氧大豆油(ESO),制得了不同ESO含量(0～15.15%)改性的环氧树脂涂层;用三点弯曲试验测试了改性涂层的临界断裂强度因子(KIC),用静态浸泡试验得到了涂层的质量增加率-时间曲线,测试了玻璃转化温度Tg,并计算出了水分子在改性涂层中的扩散系数D。结果表明:随着ESO含量的增加,涂层的KIC先增加后降低,而Tg和质量增加率则降低,D则先降后升;当ESO质量分数为7.35%时,改性涂层的耐水分子扩散性能最优。

A series of epoxy coatings with different contents （0-15.15%） of epoxidized soybean oil （ESO）were prepared by adding ESO into the system of bisphenol A epoxy resin （DGEBA） and modified diethylenetriamine（DETA）. Critical stress-intensity rupture strength factor （Kic） of the modified coating was tested according to three-point bending test and curves of mass gain and time were obtained hy static immersing test, and the glass transition temperature Wg was tested. The diffusion coefficient D of water molecules in modified coating was calculated. The resuks show that Klc increased and then decreased, Tg and mass gain decreased gradually, and D decreased and then increased with the increase of ESO content. When mass fraction of ESO was 7. 35wt%, the antiwater molecules diffusion coefficient of the modified coatings was the best.