Intercoat Adhesion of Amino-Alkyd Resin Paint

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  • アミノアルキド樹脂塗料の層間付着性
  • アミノアルキド ジュシ トリョウ ノ ソウカン フチャクセイ

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As the interval before recoating shortens, intercoat adhesive failure is liable to occur in the two coat system of amino-alkyd resin paint. The experiments were carried out to investigate the cause and mechanism for this phenomenon. The effects of the interval before recoating and the pretreatment irradiating UV to the undercoat surface on intercoat adhesion were examined using various enamels. In order to analyze the experimental results on intercoat adhesion, the change in surface properties of the undercoat was followed by the measurements of contact angles, ATR, IR and ESCA spectra. Main results were as follows : 1) It was generally recognized that intercoat adhesion increased with increasing the interval before recoating in two coat system of amino-alkyd resin paint. One of the factors affecting this result was surface oxidation of the undercoat due to air. 2) Intercoat adhesion increased remarkably by irradiating UV of wave lengths below 300 nm, and optimum level of irradiation time was recognized from the increasing tendency of intercoat adhesion. 3) From the results of surface analysis, formation of COOH, OH, hydroperoxide and C=0 groups on the irradiated undercoat surface was found. Wettability and intercoat adhesion increased with increasing concentration of these polar groups on the undercoat surface.

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