不同腐蚀环境中几种典型涂层在玻璃钢表面的附着力研究

Adhesion Between FRP and Several Typical Coatings in Different Corrosive Environments

利用加速腐蚀实验、附着力测试、红外光谱分析等手段,研究了几种典型涂层与环氧玻璃钢底材的附着力及其影响因素。玻璃钢与环氧涂层的附着力与玻璃钢表面的粗糙度和润湿性能有关,当玻璃纤维布外露时,涂层附着力最高;240#砂纸打磨底材后涂层附着力高于60#及600#砂纸打磨底材的涂层附着力。不同涂层在玻璃钢表面的附着力与涂层中主要官能团的极性有关,含有极性较强的多卤素键的氟碳树脂漆表现出较强的附着力;与环氧涂层相比,聚氨酯涂层和聚硅氧烷涂层除含有与环氧涂层相同的酯键、醚键外,还因含有氨酯键、硅氧键等极性键,显示出较高的附着力。对比40℃浸泡实验、盐雾实验和湿热实验的结果,40℃浸泡实验对涂层附着力降低的影响更大;红外光谱分析表明,40℃浸泡与盐雾实验相比涂层内部的分子降解程度更明显。

The adhesion force of several typical coatings on glass fiber reinforced plastics（FRP）and the relevant affecting factors was studied with methods of accelerated corrosion tests, adhesion testing and infrared spectroscopy. The adhesion force between FRP and coatings was related to the roughness and wettability of the FRP surface. The highest adhesion was obtained when the glass fiber clothes outcrop on the FRP surface. The FRP surface being polished with emery paper 240#showed higher adhesion for coatings rather than those with emery papers 60# and 600# respectively. In general, the adhesion of different coatings was related to the polarity of the functional groups in the coatings. Fluorocarbon resin coating which contains halogen- bonds of strong polarity showed higher adhesion. Compared with epoxy coating, both of the polyurethane coating and polysiloxane coating contain not only the ester- and ether-bonds similar to the epoxy coating, but also the urethane-, silicon oxygen- and other polar-bonds, leading to higher adhesion. Results of seriescomparative tests revealed that after immersion test in 3.5% Na Cl solution at 40 ℃ the adhesion force between FRP and coatings decreased faster than those after salt fog test and damp heat test.Correspondingly, the infrared spectroscopy of the tested coatings showed that the molecular degradation in the coatings was more severe after immersion test than after salt fog test.