Technological Method Of Vacuum Metal Plating And Coating On Plastic Surface

Plastic electroplating-technological method of vacuum metal plating and coating on plastic surface.
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In our daily life, products made of a lot of plastic and plastic products can replace the uses of metal products in many cases, but people subconsciously prefer to use products with metal texture. Because of this, our manufacturers generally need to adopt certain surface treatment methods. Electroplating the plastic surface with a layer of metal (such as aluminum, zinc, copper, silver, gold, chromium, etc.).
The common practice for manufacturers is to hand it over to a professional plastic plating factory or vacuum plating factory for processing, and the treatment methods are as follows:
The traditional electroplating methods are similar to electroless electroplating and electroplating to treat the surface of plastic or plastic products into metal sensation.
The other is vacuum spraying metal directly on the plastic surface-that is, in a vacuum, the metal is melted and deposited in molecular or atomic form on the plastic surface to form a metal film of 5-10 μ m.
Vacuum spraying metal needs a good cooperation with the plastic surface primer, the thickness of the primer is usually 10-20 μ m, the main function is to prevent the discharge of water, organic solvents and plasticizers from the plastic and affect the metal adhesion.
It requires high hardness of the coating, primer can modify plastic defects, can provide a smooth, flat surface to facilitate vacuum plating performance, and firmly adhere to the plastic substrate and the plated metal. Two-component polyurethane and epoxy coatings cured at room temperature, amino coatings baked at low temperature and thermoplastic acrylate coatings are usually selected.
Metal coating is easy to be oxidized and darkened in the air, and there are also slight defects such as vacuum, so it is necessary to apply a protective topcoat of 5-10 μ m. The requirements of the opposite paint are: transparent, excellent water resistance, wear resistance, weather resistance, do not operate the metal film, firmly adhere to the metal film. Usually acrylic varnish, polyester varnish, polyurethane varnish can be used, when the primer is thermoplastic acrylic coating, in order to prevent topcoat solvent from dissolving primer through coating defects, weak solvent and fast-drying topcoat can be selected. such as acrylic modified alkyd varnish, polyvinyl butyral varnish, polyurethane oil and so on.
The main processing steps of vacuum metal plating are as follows:
01-first carry out plastic surface treatment (such as purification and activation) "02-primer on the material surface" 03-dry the product "04-enter vacuum metal plating 05-topcoat" 06-dry the processed product.