The multi-layer coating process of low temperature cured protective coating has a significant impact on its final performance. Reasonable multi-layer coating can effectively improve the performance of the coating in many aspects.
First, in terms of adhesion, multi-layer coating helps to enhance the bond between the coating and the substrate. The first layer of coating can be used as a primer. Its formula design focuses on wetting and anchoring the surface of the substrate. It can penetrate into the microscopic pores of the substrate or react chemically with active groups on the surface of the substrate to form chemical bonding or physical Adsorption. For example, on metal substrates, ingredients such as zinc phosphate in the primer can react with the metal surface to build a strong connection foundation. Subsequent coatings are layered on top of the primer to further fill the pores and cross-link each other, which continuously enhances the adhesion between the entire coating system and the base material, effectively prevents the coating from peeling off, and ensures durability in various usage environments. Able to maintain a stable attachment state.
Secondly, for corrosion resistance, multi-layer coating can build a more complete protective barrier. Each layer of coating has certain barrier properties and can block the penetration of corrosive substances such as moisture, oxygen, and corrosive ions. The first layer of coating can block most of the erosion first, while subsequent coatings further increase the tortuousness and length of the penetration path. For example, in marine environment protection applications, multi-layer low temperature cured protective coating can effectively resist the corrosion of the substrate by chlorine ions in seawater. Compared with a single-layer coating, its corrosion resistance can be improved several times, significantly To extend the service life of protected objects.
Furthermore, from the perspective of wear resistance, multi-layer coating can optimize the surface hardness and toughness combination of the coating. The bottom coating can provide better flexibility, buffer external impact, and prevent the coating from cracking due to excessive rigidity. The upper coating can have higher hardness and effectively resist friction and wear. For example, in the protective coating of industrial equipment, the multi-layer coating process forms a soft and hard structure on the coating surface, which can not only withstand the mechanical friction during the operation of the equipment, but also maintain integrity when it is impacted, greatly improving It improves the wear resistance of the coating and reduces coating failure and equipment maintenance costs caused by wear.
Finally, multi-layer application also has a positive impact on the appearance and gloss of the coating. Through fine blending between different layers, a flatter, smoother and more uniform coating surface can be obtained. The base coat is used to fill in minor imperfections on the surface of the substrate, the mid-coat further levels and adjusts color and gloss, and the top coat provides the final high-gloss and decorative look. This multi-layer coating process is widely used in automobile painting, furniture decoration and other fields, meeting people's dual needs for product aesthetics and durability, and improving the overall quality and market competitiveness of products.
