Types of Primers for Color Steel Coil

Types of Primers for Color Steel Plates

There are four types of primers: epoxy resin, polyester resin, acrylic resin, and polyurethane resin. Generally, the primer is selected based on the product's purpose, usage scenario, processing level, and compatibility with the topcoat. The film thickness of the primer is usually 5 μ m.

(1) Epoxy primer

Good adhesion to the substrate, water resistance, alkali resistance, and chemical corrosion resistance, it is an early primer for coil materials, and its flexibility is not as good as other primers.

(2) Polyester primer

Good adhesion and excellent flexibility to the substrate, sensitive to humid environments, and resistant to chemicals

Not as effective as epoxy primer.

(3) Water soluble acrylic primer

Good adhesion to the substrate, excellent flexibility, low organic solvent content, low-temperature curing, unsuitable for storage in humid environments, and high requirements for pretreatment.

(4) Polyurethane primer

Has chemical resistance, abrasion resistance, durability, and good flexibility.