Fluorocarbon Spray Plate
(1) Fluorocarbon spray coatings are divided into two coating systems, three coating systems and four coating systems. Generally, multi-layer coating systems should be used.
Two-coating system: consisting of 5-10 μm fluorocarbon primer and 20-30 μm fluorocarbon topcoat. The total thickness of the film layer is generally not less than 35 μm, which an only be used in normal environments.
The three-coating system consists of a 5-10 μm fluorocarbon primer, a 20-30 μm fluorocarbon paint and a 10-20 μm fluorocarbon varnish. The total thickness of the film layer is generally not less than 45 μm. It is suitable for severe environmental pollution, industrial areas and coastal areas.
Four-coat system: There are two types of four-coat system. One is to add a 20μm fluorocarbon intermediate paint between the primer and the top coat when using large-particle aluminum powder pigment; the other is to add a polyamide and polyurethane blend between the primer and the top coat. The dense coating improves the corrosion resistance and increases the service life of the fluorocarbon aluminum plate. Because the general fluorocarbon paint is a sponge structure with pores, it cannot prevent the positive and negative ions in the air from penetrating freely to the base of the metal plate. Therefore, this coating system is more suitable for severe environmental pollution, industrial areas and coastal areas.
(2) Curing of fluorocarbon baking varnish: It should be baked with a few coats to make each layer of lacquer completely cured, forming good adhesion, corrosion resistance and fading resistance, avoiding more baking and less baking.
(3) When selecting fluorocarbon lacquered aluminum panels, attention should be paid to the brand and main technical indicators of fluorocarbon lacquer, and the fluororesin content should be ≥ 70%.