Method for preparing water-soluble acrylic-modified phenolic-modified epoxy resin, water-soluble acrylic-modified phenolic-modified epoxy resin prepared thereby, and aqueous coating composition comprising same

Abstract

According to the present invention, there are provided a preparation method of a water-soluble acryl-modified phenolic-modified epoxy resin including preparing an acrylic copolymer resin containing a carboxylic acid group; preparing a phenolic-modified epoxy resin by reacting an epoxy resin with a phenolic compound; preparing an acryl-modified phenolic-modified epoxy resin by ester-reacting the acrylic copolymer resin with the phenolic-modified epoxy resin; and preparing a water-soluble acryl-modified phenolic-modified epoxy resin by neutralizing the acryl-modified phenolic-modified epoxy resin, a water-soluble acryl-modified phenolic-modified epoxy resin prepared thereby, and an aqueous paint composition including the same. According to the present invention, the water-soluble acryl-modified phenolic-modified epoxy resin and the aqueous coating composition including the same may be applied to most of conventional uses in which the epoxy resin is used due to excellent various physical properties. In addition, the formed coating film may be usefully applied as an aqueous coating composition for the inner surface of a two-piece can lid and the inner and outer surfaces of EOE due to excellent post-forming processibility, chemical stability in contents, and thermal stability at a high temperature.