PAINT COMPOSITION FOR AQUEOUS PLASTIC MATERIAL, WHICH IS CURED AT LOW TEMPERATURE

摘要

PURPOSE: A paint composition which is cured at low temperature, is provided to have physical property equal to oil type paint and curing capability at less than 60 deg.C, improve workability and to prevent crack of substrates causing inferiority rate by containing aqueous acrylurethane resin having hydroxyl radicals and isocyanate compound having hydrophilic radicals. CONSTITUTION: The paint composition comprises 10-40 wt.% of aqueous acrylurethane resin based on solid content of the composition, 0.6-0.9 wt.% of isocyanate compound having hydrophilic radicals as a curing agent, 2-40 wt.% of pigment and 10-30 wt.% of conventional additives. The isocyanate groups to hydroxyl groups (£NCO|/£OH|) contained in the aqueous acrylurethane resin and the isocyanate compound is in an equivalent ratio of 0.9/1 to 1.2/1. The acrylurethane resin has a hydroxyl group value of 7-12mgKOH/g. The isocyanate compound is preferably hexa diisocyanate compound having polyether hydrophilic groups. The paint composition has a curing temperature of 50-60 deg.C.