Small knowledge of coatings – common cross-linking and curing methods of acrylic resin coatings UV absorber manufacturers

Acrylic resins can be divided into thermoplastic and thermosetting acrylic resins according to their structure and film-forming mechanism. Thermoplastic acrylic resins are widely used in automobiles, electrical appliances, machinery, construction and other fields. Thermoplastic acrylic resin does not cross-link during the film-forming process. It has a relatively large molecular weight, good gloss and color retention, water and chemical resistance, fast drying, convenient construction, and easy construction and recoating. When preparing aluminum powder paint Aluminum powder has good whiteness and positioning.

Thermosetting acrylic resins generally have a relatively low molecular weight and have certain functional groups in the molecular structure. They are cross-linked and cured with functional groups in amino resins, polyurethanes, epoxy resins and other components added during paint making The reaction forms an insoluble and infusible network structure. Thermosetting acrylic coatings have excellent fullness, gloss, hardness, solvent resistance and weather resistance, and are widely used in industries such as automobiles, motorcycles, bicycles, and coiled steel. Coating products used in industries such as cars and construction machinery with high quality requirements often need to add UV absorbers, light stabilizers and other additives to their formulations to further improve the weather resistance of the coatings.

There are two common cross-linking methods for thermosetting acrylic resins. One is the reactive cross-linking type. There is no cross-linking reaction ability between the functional groups in the resin polymer, and a suitable cross-linking component must be added, such as melamine resin, epoxy resin, urea resin and metal oxide, etc., after reacting with it Cross-linking and curing. The cross-linking component cannot be stored for a long time after being added, and should be used in time; the second is the self-crosslinking type, the polymer chain itself contains more than two reactive functional groups, such as hydroxyl, carboxyl, amido, methylol, etc., heating At a certain temperature, or adding a catalyst at the same time, the functional groups can react with each other to complete crosslinking and curing. These thermosetting acrylic resins are mainly used as fabric, leather, paper treatment agents, industrial paints and architectural coatings.

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