Corrosion-resistant thermosetting powder coating, and preparation method thereof

Abstract

The invention belongs to the field of coating, and provides a corrosion-resistant thermosetting powder coating, and a preparation method thereof. The corrosion-resistant thermosetting powder coating mainly comprises, by weight, 30 to 50 parts of epoxy resin, 3 to 8 parts of a curing agent, 8 to 12 parts of polyester resin, 2 to 5 parts of a surface accessory ingredient, 3 to 8 parts of phenolic resin, 10 to 20 parts of barium sulfate, 1 to 3 parts of a pigment, 3 to 8 parts of aluminum powder, 3 to 6 parts of carbon powder, and 1.2 to 1.8 parts of a light stabilizing agent. The corrosion-resistant thermosetting powder coating possesses thermal oxidation resistance and photooxidation resistance at the same time, and excellent corrosion resistance, weather resistance, ultraviolet optical rotation resistance, aging resistance, and stability; color preserving capacity lasts for a long term; no pulverization, crazing, or peeling is caused after long term of ultraviolet irradiation; problems of conventional powder coating that weather resistance and ultraviolet optical rotation resistance are poor, adhesive force is easily reduced, pulverization, crazing, and peeling are easily caused; and powder coating service life is prolonged.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a corrosion-resistant thermosetting powder coating and a preparation method thereof. Background technique [0002] Thermosetting powder coating refers to the use of thermosetting resin as a film-forming substance, adding a curing agent for crosslinking reaction and heating to form an insoluble and infusible hard coating. At higher temperatures, the coating does not soften like thermoplastic coatings, but only decomposes. Since the resin used in thermosetting powder coatings is a prepolymer with a low degree of polymerization and a low molecular weight, the leveling property of the coating is better and the decoration is better, and after the low molecular weight prepolymer is cured, It can form network cross-linked macromolecules, so the coating has better anti-corrosion and mechanical properties. Therefore, the development of thermosetting powder coatings is particularly rapid. [000...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a corrosion-resistant thermosetting powder coating and its preparation method. The powder coating of the present invention can resist thermal oxidation and photooxidation simultaneously, and has excellent corrosion resistance, weather resistance, UV resistance and anti-aging performance. And stability, long-lasting color retention, after a long period of ultraviolet radiation, it will not be powdered, cracked, and peeled off, which solves the problem of poor weather resistance and UV resistance, poor adhesion, easy chalking, and Problems such as cracking and peeling prolong the service life of the powder coating