Explanation

coatings with alkyd resin as the main film-forming material. alkyd resin is a special polyester resin obtained by polycondensation of polyols, polybasic acids and fatty acids. Using glycerol (propanol) and pentaerythritol as polyols; Polybasic acids often use phthalic anhydride and sometimes maleic anhydride; Fatty acids come from various plant oils. The proportion of vegetable oil in the formula is the oil content of resin. According to the oil content, it can be divided into short, medium and long oil content. Oil free alkyd resin resin is called if it does not contain vegetable oil. In order to improve the performance of alkyd coatings, rosin, phenolic, styrene, acrylic acid, epoxy, silicone and other resin or monomer are also used for modification. alkyd resin coatings rank first in terms of output and are widely used, including varnish, enamel, ready-mixed paint, primer, second layer primer, drying primer, patty, antirust paint, electrophoretic paint, insulating paint, arc resistant paint, enamelled wire paint, capacitor paint, resistance paint, heat resistant paint, heat insulation paint, chimney paint, marking paint, water sand paper paint, semi-gloss paint, matte paint, etc. Performance of alkyd resin coatings: ① the coating has good flexibility, adhesion and mechanical strength; ② pigment and fillers can be evenly dispersed, the film color is uniform, the hiding power is good, and the appearance is plump; ③ The coating has good durability and light retention; ④ good solvent and heat resistance, but poor water resistance

Classification