Conductive paint is in the varnish by adding silver, copper, nickel or graphite and other conductive powder, so that the paint has conductivity. Commonly varnishes are polyurethane or acrylic lacquers. Dispersion and dispersing agents are often added to reduce the settling rate of the conductive powders and to disperse them well. To prevent oxidation of conductive powder, but also often add anti-oxidants. Commonly conductive powder is nickel powder. The coating process is as follows

1) Surface preparation. If the molded surface is clean, it can be applied directly. If the release agent is used for molding, degreasing should be carried out with an appropriate solvent or degreasing agent. To improve the adhesion of the paint layer, use fine sandpaper to polish the surface.

For foam molded parts, degassing should be carried out 72h to prevent paint layer blistering.

2) Priming. For closing the pores of the plastic surface and improving the adhesion of the paint layer, the primer should be primed. This primer should be compatible with the conductive paint to prevent cracking, peeling, swelling and other defects.

3)Deployment of conductive paint. It should be based on the type of plastic substrate and the requirements of the paint to choose the appropriate paint and thinner. Dilution of paint should be fully stirred.

4) Spraying. General lmm nozzle diameter of spray gun for the general, paint viscosity of l4 ~ 16s (with cone disc viscometer, No2 cup measurement). In order to make the conductive powder suspend well, it is necessary to use a pressurized tank equipped with a propeller for stirring.

A minimum value shall be specified because the shielding value of the paint layer is related to the thickness of the paint layer. Paint layer should not be too thick, otherwise it will produce nodules and cracks. Generally 40 to 60 μm.

5) spray paint. From the decorative point of view, and often spray a layer of finish. At this point to prevent the topcoat solvent into the conductive paint layer and erosion of the solvent-sensitive plastic matrix.