PREPARATION AND PERFORMANCE STUDY OF ACRYLIC RESIN FOR ANODIC ELECTROPHORETIC COATINGS

The acrylic anodic electrophoretic coatings were synthesized via radical solution copolymerization. Influences of monomers of acrylic ester with different acid values, hydroxyl values and various cosolvents on the performance of acrylic electrophoretic paint were studied. Thermal curing process of the acrylic resins was studied，and the structures of resins and paint were characterized. It was found that with the increase of the MAA content the particle diameter of the electrophoretic paint decreased significantly，the viscosity of ectrophoretic paint increased slightly and the stability improved greatly. By preparation conditions of acrylic resins copolymer with an acid value of 64.6mg KOH/g, a hydroxyl value of 85.5mg KOH/g，Tg of 20℃ and a 2:3 volume radio of diethylene glycol monomethyl ether to isopropyl alcohol，the electrophoretic coatings have good bath stability，and the film gained from the electrophoretic coatings by thermal curing presents smooth，plump and bright appearance，with hardness of 5H，adhesion of 1 grade，impact strength of 50 kg?cm and resistance to methyl ethyl ketone wipe 100 times.