Metals other than gold and silver, the nature of other metals are not too stable, water and air are more likely to oxidize. In order to make the metal more corrosion-resistant, they are generally sprayed with plastic parts. Plastic spraying is mostly used in the inner layer of metal equipment, the use of paint spraying, metal equipment becomes corrosion-resistant, the use of life will also become long. Plastic parts spraying is not at any time can be used, it has a certain construction conditions, the following we will be specific about the construction conditions and processes of plastic parts spraying.
Plastic parts spraying construction conditions
Spraying construction temperature (25 ± 5) ℃. The construction relative humidity is not more than 80%. When the humidity is too large, add CHA-13 or F-1 moisture-proof agent in the paint to prevent the coating from whitening.
Plastic spraying process
1. Annealing
Plastic molding is easy to form internal stress, after painting the stress concentration is easy to crack. Annealing treatment or whole surface treatment can be used to eliminate stress. Annealing
Process is the ABS plastic molding parts heated to below the heat distortion temperature, that is, 60 ° C, insulation 2 h. Because of the use of such a process requires a large investment in equipment, therefore, can be used throughout the surface of the technology, that is, configure to eliminate the internal stress of the plastic
Pieces of the solution at room temperature on the surface of the plastic parts can be 15 ~ 20min of treatment.
2. Degreasing
Plastic surface is often stained with oil, sweat and mold releasing agent, it will make the coating adhesion deterioration, coating cracking, blistering and peeling. Degreasing treatment should be carried out before coating. Plastic parts are usually cleaned with gasoline or alcohol, and then chemical degreasing should be thoroughly cleaned after the residual lye on the surface of the workpiece, and finally cleaned with pure water, air dry or drying.
3. In addition to electricity and dust
Plastic products are insulators, surface resistance is generally around 1013Ω, easy to generate static electricity. Electrified easily adsorbed fine dust in the air and attached to the surface. Due to electrostatic adsorption of dust with the general blowing method is very difficult to remove, the use of high-pressure ionized air flow at the same time in addition to the effect of electrostatic dust removal is better.
4. Spraying
The thickness of the plastic coating is 15~20μm, and it is usually necessary to spray 2~3 channels to complete. A spraying after drying 15min, and then the second spraying. The surface that needs to be bright must also be sprayed with transparent coating. The coated parts have no effect on the flame retardant properties.
5. Drying
After painting, it can be dried at room temperature, or baked at 60℃ for 30min.
Plastic spraying requires people to be patient, according to the process step by step, can not be omitted any step, and to make each step almost perfect. Especially the details must be extra careful, otherwise the plastic parts sprayed out of the effect is not so good. Plastic parts spraying the biggest effect is to be able to prevent corrosion, which has a great relationship with its raw materials, at the same time this also determines the scope of its use, usually used in some metal equipment above, a lot of construction sites on the metal equipment have gone through the plastic parts spraying.