How to paint a car

Paint mixing can be divided into computer paint mixing and manual paint mixing.

1, computer paint mixing, that is, first find the same code or color as the paint on the car in the computer paint mixing system or paint mixing color card, and the paint composition will appear in the computer, and then weigh it out in proportion with an electronic scale.

2, manual paint mixing, it is necessary for the paint mixer to carefully analyze the ingredients in the paint. After calling out the outline, observe it from different angles to see if the colors are consistent, and fill in any colors that are missing. Because there are too many color masterbatch, it needs a lot of experience. For example, the paint is poor in red, but there are many kinds of red. It depends on your own experience.

Paint mixing ratio:

Proportion of common paint: paint: curing agent: diluent 2: 1: 0.5- 1 (added as appropriate)

Proportion of metallic paint: paint: diluent 1: 1. You can spray oil without curing agent.

Pearlescent paint ratio: paint: thinner 1: 1. You can spray bright oil without curing agent.

Varnish (bright oil) ratio: varnish: curing agent: diluent 2: 1: 0.2-0.5 (added as appropriate) must be sprayed twice, the first time is virtual spraying, the gun is 1/2, and the second time is 3/4 (white and silver need not be compacted).

Matte paint ratio: matte paint: curing agent: diluent 1: ≤ 0.25: 1.

Primer ratio: primer: diluent 1: 1.

Proportion of plastic primer: spray directly without any substance.

Extended data:

Paint composition:

Automobile paint generally has four basic components: film-forming substance (resin), pigment (including car body pigment), solvent and additive.

1, the film-forming substance is the main component of paint, and its function is to keep the pigment bright and make it adhere to the surface of the object for a long time, which is the substance that determines the type of paint.

Generally, it is made of drying oil or semi-drying oil modified natural resin (such as rosin), artificial resin (such as dehydrated malic acid resin) and synthetic resin (such as methyl methacrylate, polyurethane, polystyrene, polyvinyl chloride, etc.). ).

The durability, adhesion, corrosion resistance, wear resistance and toughness are usually adjusted and improved by adding plasticizers and catalysts.

2. Pigment is one of the two non-volatile substances in the paint, which endows the topcoat with color and durability, and at the same time makes the paint have hiding power, improves strength and adhesion, changes luster, and improves fluidity and painting performance.

3. Solvent is a volatile component in the paint, and its main function is to fully dissolve the resin in the paint film, so that the paint can be constructed normally. High-quality solvent can improve the daubing performance and paint film characteristics of topcoat, enhance gloss and reduce paint reticulation, thus reducing polishing workload and contributing to more accurate color matching.

In addition to the existing solvent in the coating, it is also used as a diluent to dilute the coating to make its viscosity suitable for painting requirements.

4. Additives In recent ten years, the coating process has undergone tremendous changes, and the use of additives has become more and more common. Although the proportion of additives in coatings does not exceed 5%, they play various important roles.

There are curing agents that can accelerate drying and enhance gloss, retarders that can slow drying, and matting agents that can weaken gloss. Some additives have comprehensive functions: reducing wrinkling, accelerating drying, preventing whitening and improving chemical resistance.

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