The invention discloses a high anticorrosion phosphating-free polyester powder coating and its production method. Preparation of polyester resin: Mix plant-based diol, neopentyl glycol, terephthalic acid, isophthalic acid, trimethylolpropane, pentaerythritol and catalyst; conduct acidolysis by heating; perform vacuum polycondensation; cool down, add curing accelerator and natural cooling. Preparation of powder coating: Premix polyester resin, curing agent, wetting accelerator, leveling agent, degassing agent, barium sulfate, mica powder and pigments; conduct hot melt extrusion, tableting, crushing and sieving via a twin-screw extruder. The cured coating features compact structure, high gloss, excellent weather resistance, strong adhesion and superior salt spray resistance. It eliminates the need for phosphating or chromating pretreatment, reduces environmental pollution, lowers coating cost and improves production efficiency.
Country Code: CN
Application Number: CN202411043655.7
