Water-based electroplating varnish resins include acrylic resin emulsions, acrylic resin water dispersions (also known as water-soluble acrylics), and acrylic resin aqueous solutions.

　　Compared to traditional solvent-based coatings, waterborne electroplating varnish resins offer several advantages, including lower costs, enhanced safety in use, efficient resource and energy conservation, and reduced environmental pollution and public health risks—making them the primary focus of current developments in the coatings industry. Among waterborne coatings, water-based electroplating varnish resin coatings stand out as a rapidly growing, eco-friendly option. Once cured, these water-based coatings exhibit excellent properties: strong adhesion to substrates, superior corrosion and chemical resistance in the cured film, minimal shrinkage, high hardness, and outstanding wear and corrosion resistance, along with impressive electrical insulation performance.

　　Acrylic resin emulsions are primarily produced by emulsifying oil-based monomers in water, initiated with water-based free-radical initiators, whereas resin dispersions are synthesized via free-radical polymerization or stepwise polymerization. In terms of particle size, emulsions have larger particles than water-dispersed resins, which in turn are larger than those found in aqueous solutions. From an application standpoint, the first two—emulsions and dispersions—are particularly important.

　　Water-based electroplating varnish resins are primarily used in latex paints. They play a significant role in the architectural coatings market, and their application scope continues to expand steadily. In recent years, there has been growing emphasis on the development and application of acrylic resin water dispersions, which are increasingly being adopted across both industrial and consumer coating sectors. Based on monomer composition, these resins are typically categorized into pure acrylic emulsions, styrene-acrylic emulsions, vinyl acetate emulsions, silicone-acrylic emulsions, vinyl acetate-tert-butyl carbonate (VABC) emulsions, and tert-butyl carbonate-acrylate (TBCA) emulsions.

　　Water-based electroplating varnish resins are categorized into water-dispersible and water-soluble types. The former is based on water emulsions or aqueous sols. Water-based electroplating varnish resins are formulated from copolymer resins equipped with reactive and crosslinkable functional groups. These resins represent thermosetting coatings—either with or without crosslinked structures—where the reactive functional groups undergo crosslinking during film formation, ultimately creating a robust, matrix-like coating film. By developing water-based acrylic coatings, it becomes possible to replace most of the conventional organic volatile solvents with water while still preserving the unique properties of acrylic paints, thereby significantly reducing air pollution.

　　Water-based electroplating varnish resins are predominantly anionic in nature. In the monomers used to synthesize the copolymer resin, an appropriate amount of unsaturated carboxylic acids—such as acrylic acid, methacrylic acid, maleic anhydride, and methylene succinic acid—is selected to introduce carboxylated side chains. These chains are then neutralized with organic amines or ammonia solutions to form salts, resulting in water-soluble acrylic resins.