水性环氧树脂/纳米SiO2复合疏水涂层的制备及性能研究

用氨基硅油（ APDMS）改性水性环氧树脂（ EP）得到疏水性的环氧树脂乳液（ APDMS-EP）；用 1H，1H，2H，2H-全氟辛基三乙氧基硅烷（ FAS）与纳米 SiO₂反应得到氟改性纳米 SiO₂（F-SiO₂）。采用不同比例的 F-SiO₂与 APDMS-EP进行复配，室温固化制备疏水涂层，并对 F-SiO₂的结构进行了表征，研究了 F-SiO₂用量对涂层的接触角、铅笔硬度、附着力、热稳定性及耐腐蚀性能的影响。结果表明： APDMS的引入使水性环氧树脂涂层的水接触角从 47.3°提高到 97.7°；加入 F-SiO₂后涂层疏水性进一步提高，当加入 15%的 F-SiO₂时，涂层对水和丙三醇的接触角分别为 120.3°和 104.5°，F-SiO₂的加入也增强了涂层的防腐性能。

Preparation and Properties of Waterborne Epoxy Resin/Nano-SiO2 Composite Hydrophobic Coatings

The hydrophobic epoxy resin emulsion（APDMS-EP） was prepared by modifying waterborne epoxy resin（EP） with amino silicone oil（APDMS）. Fluoro-modified nano-SiO₂（F-SiO₂） was obtained by the reaction of 1H，1H，2H，2H-perfluorooctyltrie-thoxysilane（FAS）with nano-SiO₂. Hydrophobic coatings was prepared by curing of APDMS-EP mixed with different contents F-SiO₂ at room temperature. The structure of F-SiO₂ was characterized by FT-IR，TEM and TG. The effects of F-SiO₂ dosage on the contact angle， pencil hardness，adhesion，thermal stability and corrosion resistance of the coating werestudied. The results showed that the water contact angle（WCA）of waterborne epoxy resincoating increased from 47. 3° to 97. 7° by introducing APDMS. Adding F-SiO₂ can further improved the coating’s hydrophobicity. When the dosage of F-SiO₂ was 15%，the coating’s WCA and glycerol CA were 120. 3° and 104. 5° respectively；SEM indicated that F-SiO₂ formed a dual micro-nano rough structure on the coating’s surface. EIS and immersion tests showed that F-SiO₂ enhanced the anti-corrosion performance of the coatings.