Acrylic resin (C3H4O2) is copolymerized from acrylic esters or methyl methacrylate and other olefinic monomers. By selecting different types of acrylic resins, pigments, additives, solvents, and crosslinking agents, a diverse range of acrylic coatings with various properties and widespread applications can be synthesized.
Chemical Structure of Acrylic Resin
Acrylic monomers, due to their unique structure with carbon chain double bonds and acyl groups, copolymerize to form acrylic resins. The main absorption peaks of these acrylic resins lie outside the range of the solar spectrum, imparting excellent light resistance and weathering performance to acrylic coatings. Acrylic coatings exhibit the following significant characteristics:
Due to its outstanding light resistance, acrylic coatings find the most significant market in automotive paints. Additionally, they are widely used in industries such as household appliances, metal furniture, aluminum products, sheet metal, instruments, building construction, textiles, plastics, wood products, paper, and more.
There is a wide variety of acrylic coatings, typically categorized into solvent-based acrylic coatings, waterborne acrylic coatings, and solvent-free acrylic coatings. Applications os these acrylic coatings are as follows:
|Solvent-based Acrylic Coating
|Thermoplastic Acrylic Coating
|Plastic Coatings, Automotive Repair Paints, Exterior Wall Coatings
|Thermosetting Acrylic Coating
|Depending on the curing agents used
|Hydroxy Acrylic Coating
|Amino resin as curing agent for baking crosslinking. Primarily used in automotive topcoats, household appliances, and hardware tools.
Polyisocyanate as curing agent. Mainly applied in automotive topcoats and touch-up paints, as well as coatings for plastics, exteriors, and machinery.
|Epoxy Acrylic Coating
|Polyacid and polyamine as curing agents. Mainly used in can coatings.
|Carboxylic Acrylic Coating
|Epoxy or amino resins as curing agents for crosslinking. Mainly used in can coatings.
|N-Hydroxymethyl Acrylic Coating
|Amino resin as curing agent with baking crosslinking. Mainly used for metal substrates.
|Water-based Acrylic Coating
|Waterborne Acrylic Coating
|Automotive Electrophoretic Coating, Household Appliance Coating, Leather Coating
|Emulsion Acrylic Coating
|Interior and Exterior Architectural Coating, Wood Coating
|Solvent Free Acrylic Coating
|UV-Curable Acrylic Coating
|Wood Coating, Paper Coating, Fiber Optic Coating
|Acrylic Powder Coating
|Household Appliance Coating, Aluminum Wheel Coating
Thermoplastic acrylic resin does not undergo further crosslinking during the film-forming process. As a result, it has a relatively high molecular weight, exhibiting good light and color retention, water and chemical resistance, fast drying, and easy application. It is convenient for construction, re-coating, and rework. When preparing aluminum powder paint, the resin ensures the brightness and good positioning of the aluminum powder. Thermoplastic acrylic resin finds widespread applications in fields such as automotive, electrical appliances, machinery, and construction.
Thermosetting acrylic resin refers to a structure containing specific functional groups that, during paint formulation, react with functional groups in added amino resins, epoxy resins, polyurethanes, etc., forming a network structure. Thermosetting resins generally have a relatively low molecular weight. Thermosetting acrylic coatings exhibit excellent fullness, gloss, hardness, solvent resistance, weather resistance, and do not discolor or yellow during high-temperature baking. One of its most important applications is in combination with amino resins to produce amino-acrylic baked coatings, widely used on products such as automobiles, motorcycles, bicycles, and coated steel.