Investigation on Reaction Mechanism of Amino-Alkyd Resins (1) Development of Melamine Resin Species

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  • アミノアルキド樹脂系塗料の硬化反応機構の研究 (1) メラミン樹脂分子種の検討

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Melamine resins have been used as one of the important crosslinkers for alkyd, acrylic and epoxy resins. Generally their curing has been performed at 130-150°C for 20min, but lower temperature curable or rapid curable melamine resins have been studied extensively in recent coating industries from the view point of the reduction of energy in the curing process.<BR>In this paper, a commercially available melamine resin was separated into five fractions by preparative gel permeation chromatograph. Chemical and molecular characteristics of the fractions were examined. Then alkyd/melamine coatings were studied by analysis of the reaction volatiles evolved during baking and measurement of physical properties of the cured film. <BR>A key to improved curability at a rapid curable baking condition was found to be introduction of higher molecular weight fractions of the melamine resin.

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