It is used to make paints, adhesives, plastics or tanning materials, and it is also used for shrink-proof and wrinkle-proof treatment of fabrics and papers.
amino resin for coatings is a multifunctional compound, which is obtained by addition condensation of compounds containing (-NH2) functional groups with aldehydes (mainly formaldehyde), and then partial or total etherification of the generated hydroxymethyl (-CH2OH) with aliphatic monohydric alcohols. According to the different amino compounds used, it can be divided into four categories: urea-formaldehyde resin, melamine resin, benzene melamine resin and * * * poly resin.
If amino resin is used alone as a paint film, the paint film is too hard and brittle, and has poor adhesion to the substrate, so it is usually combined with other types of resins that are compatible with amino resin and can be crosslinked by heating. It can be used as a crosslinking agent for oil-modified alkyd resin, saturated polyester resin, acrylic resin, epoxy resin, epoxy ester, etc. By such matching, a paint film with three-dimensional network structure can be obtained by heating. According to the amino resin and the used amino resin,
The paint film with amino resin as cross-linking agent has excellent luster, color retention, hardness, chemical resistance, water resistance and weather resistance, so the paint with amino resin as cross-linking agent is widely used in industrial coatings such as automobiles, industrial and agricultural machinery, freshly made furniture, household appliances and metal precoating. Amino resin can be baked at bottom temperature or cured at room temperature in the presence of acid catalyst, which can be used for reactive two-liquid wood coating and automobile repair coating.