WATER SOLUBLE URETHANE RESIN COMPOSITION FOR BASE COATING OF PRE-COATED METAL PANEL AND PAINT COMPRISING THE SAME

摘要

PURPOSE: Provided is a water soluble urethane resin composition for base coating of a PCM(pre-coated metal) panel, which minimizes the content of an organic solvent and improves interlayer adhesion to a top coating layer to give excellent solvent resistance, gloss, processability and physical properties. CONSTITUTION: The water soluble urethane resin composition for base coating of a PCM panel comprises: urethane polymer prepared by adding dimethylol propionic acid or dimethylol butanoic acid to polyester polyol, adding a diisocyanate compound thereto, reacting the reaction mixture, and then adding a neutralizer; and 5-30 parts by weight of a melamine-based curing agent or a phenolic curing agent, based on 100 parts by weight of solid content of the urethane polymer.