Effects of Paint Composition and Conditions for Making Films on Melamine Resin Concentration in the Surface of Polyester Films

Abstract

In polyester resin films cured by melamine-formaldehyde resin (MF), MF concentration in the surface of films was measured by X-ray photoelectron spectroscopy (XPS). The MF concentration in the surface increased as the following parameters increased; MF concentration in paints, catalyst concentration, baking temperature (peak metal pemperature), and film thickness. Performance of the prepainted steel sheets having MF enriched films were also evaluated. Stain resistance and T-bend ability of prepaited steel sheets improved with increasing MF concentration in the surface of the films. MF enriched films were found to have both excellent formability and stain resistance.