Introduction of commonly used coatings
1, polyurethane two-component resin synthetic coating (PU) polyurethane two-component resin synthetic paint is the abbreviation of polyurethane paint. It is composed of polyisocyanate and polyhydroxyl compound, which forms polyurethane membrane as the main film forming material. It is one of the main varieties of wood varnish used at home and abroad. PU two-component coatings, a group containing polyisocyanate (---NCO) oligomers (or adduct), used as curing agents. The second component is polyhydroxyl (---OH) compound or tree, pigments, fillers, solvents, catalysts and other additives. The two components and PU dilute a and B are rare.
Classification of solvents for paints and coatings
There are many kinds of civil coatings, and the classification is quite complicated. Generally, there are the following: 1. According to the type of film forming resin, it is divided into: 1 polyester (PU) varnish, 2 nitro (NC) lacquer 3 acrylic acid 4 unsaturated polyester (PE) paint 2, according to whether there is pigment classification: 1 color paint (refers to the pigment containing colored opaque solvent free coating) 2 varnish (refers to solvent free paint without pigment, general transparent). 3. According to the mechanism of film-forming drying: A, physical drying coatings (drying process only solvent evaporation, no chemical reaction) B, chemical drying coatings.