What are the functions of car primer
Car primer is the first coating directly sprayed on exposed sheet metal surfaces, including sheet metal phosphating, electrophoretic coating, and primer filling. It is a full vehicle primer that requires excellent adhesion to the substrate, as well as outstanding rust prevention, corrosion resistance, oil resistance, and other characteristics. What are its effects and requirements? Let's take a look together.
1、 Effect of Primer
Primer is a type of paint that is usually applied directly to the surface of an object or putty. The effect is to prevent oxidation and corrosion of the metal surface, and improve the adhesion between the metal surface and putty, as well as between putty and topcoat.
A suitable primer is a condition for the durability and aesthetics of the topcoat. If the primer is not good, the appearance of the topcoat will be affected, and even cracks or peeling will occur.
After removing rust and rust from the old paint film board, if a small area of paint can be directly applied to the exposed metal surface, putty can be applied, and one or two components can be closed on the primer before spraying.
But if a large area of paint is used to prevent direct putty on the bare metal substrate and the use of single component primer, the correct method is to use phosphating primer or epoxy primer, then apply putty, and then use the primer to close the two components. Durable, corrosion-resistant, and perfect exterior treatment coating.
In the correction process, the primer and topcoat can be directly sprayed onto the electrophoretic primer. Some accessories are coated with general protective primer. Although the primer does not have the adhesion and durability of electrophoretic primer, it can also ensure that the steel does not rust for a certain period of time. This protective primer is usually sanded before applying the correction coating.
2、 Requirements for primer
1. The surface of the workpiece should have excellent adhesion after surface treatment, and the resulting primer film should have excellent mechanical strength.
2. The primer itself needs to be a corrosion inhibitor, and the primer coating needs to have excellent corrosion resistance, water resistance, and chemical reagent resistance.
3. Excellent compatibility with intermediate or topcoat coatings.
4. Being able to adapt to the characteristics of the car painting process in many water production, the primer should have excellent construction performance.
Article source: Automotive repair paint http://www.zjlicheng.com
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