Powder coating with high salt spray corrosion resistance and preparation method thereof

Abstract

The invention discloses a powder coating with high salt spray corrosion resistance and a preparation method thereof. The powder coating is prepared from the following raw materials in parts by weight: 75-85 parts of polyester resin, 1-3 parts of a curing agent, 3-5 parts of disc-shaped alpha-zirconium phosphate, 2-4 parts of nano silicon oxide, 6-8 parts of nano aluminum oxide, 1-2 parts of a flatting agent, 1-2 parts of a dispersing agent and 8-12 parts of filler. The disc-shaped alpha-zirconium phosphate is added into the raw materials, has good compatibility with the polyester resin and can be uniformly distributed in the powder coating, and the problem that other nano anti-corrosion materials are poor in dispersity is solved; the disc-shaped alpha-zirconium phosphate has a relatively regular regular hexagonal butterfly-shaped sheet structure, and can force a corrosive medium to be transmitted inwards along a curve in a coating of the powder coating, prolong a migration and diffusion path and play a physical barrier role, so that the corrosion progress is greatly delayed; in addition, hydroxyl groups on the surface of disc-shaped alpha-zirconium phosphate are combined with carboxyl groups in free polyester, so that the thermal stability of the powder coating can be improved.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to powder coatings with high salt spray corrosion resistance and a preparation method thereof. Background technique [0002] In various fields of production and life, metal materials, such as steel and aluminum, are widely used. In order to increase their service life, the anti-corrosion problem of these metal surfaces has always been closely concerned by people. In order to solve the anti-corrosion problem, people continue to develop new anti-corrosion materials. The most commonly used anti-corrosion method is to spray paint. However, paint is usually used in wood furniture, and it is not suitable for some industries that require heavy anti-corrosion. [0003] Powder coating is a better material to replace paint. Powder coating has a history of nearly fifty years since it was developed and researched in the 1940s and 1950s. As far as the application of anti-corrosion lam...

AI Technical Summary

Problems solved by technology

[0004] The existing powder coatings often enhance the acid and alkali corrosion resistance by adding nano-functional fillers. However, due to the characteristics of nano-materials, they are not easy to disperse in powder coatings and are prone to agglomeration, resulting in poor overall performance of powder coatings. ideal