Conductive paint is dried to form a film can be used for spraying of a paint and can play the role of conductivity, and thereby shielding electromagnetic interference. The shield is the isolation of the metal between the two space areas to control the electric, magnetic and electromagnetic induction from one region to another region and radiation.
Specifically speaking, is a shielding body surrounded by the source of interference of the component parts, circuit assembly, cable, or the entire system, to prevent the outward diffusion of interfering electromagnetic fields; enclosed shielding body the reception circuit, devices or systems, to prevent them by outsidersthe impact of the electromagnetic field. Conductive paint is using a conductive metal powder added in the raw material of a specific resin, made to paint coating be able to spray.
The doped conductive coating based on the polymer to join the conductive substance, use the conductive effect of the conductive substance to achieve the coating conductivity at 10-12S / m or more. It not only has a conductive function, but also has many excellent properties of the polymer, can adjust in a wide range depending on the electrical and mechanical properties of the coating, and lower-cost, simple, and thus more widely used. The doped conductive coating composition by the polymer, a conductive filler, solvent, and additives. Commonly used in metal-based filler, a carbon-based filler, a metal oxide-based filler, composite fillers, new nano conductive filler.
The conductive properties of the metal-based conductive coating depends on the kind of the metal filler, the type, quantity, shape of the filler of the quantity, metal fibers and metal powder. Metal-based fillers have silver powder, nickel powder, and copper powder, etc., wherein the silver powder has a good chemical stability and excellent anti-corrosion properties, and high conductivity, is an electrically conductive filler has been developed and applied earlier. However, the silver price is relatively expensive, more used in the military field, fewer civilian applications. Nickel powder chemical stability is good, with effective anti-electromagnetic interference performance, the price is relatively modest, widely used. The copper powder having a low price, with silver similar conductive, its drawback is that the copper is easily oxidized, conductivity is not stable, but through special surface treatment, it is possible to obtain the stability of a copper-based conductive coating, with copper powder oxidation technologies improve, copper-based conductive coatings is bound to be a further concern.
Nanotube conductive coatings, the nanotubes having a great aspect ratio and excellent electrical properties, it is added to the polymer as a reinforcing phase, can greatly improve the mechanical properties of the polymer, optoelectronic properties, thus put it to use in the preparation of functional nanotubes / polymer conductive coating applications in many fields. Nanotube conductive material and the film-forming material mutual penetration with almost the same magnitude of the particle diameter, no apparent interface with each other, so the anticorrosive performance of the nanotube conductive coating is better than the general anti-corrosion coating properties.
Conductive coating of metal oxide, metal oxide due to its excellent electrical properties, light in color, better to fill the gap between the conductive metal pigment anti-corrosion defects and poor carbon-based the conductive pigments decorative performance. Composite fillers are glass beads, copper powder and mica powder coated with silver powder and carbon black coated nickel powder and so on. Metal oxide conductive pigment-doped tin oxide, zinc oxide, antimony dioxide, etc., which SnO2 as a representative, be value for the density is small, good stability in the air, the light color can prepare transparent coating, etc.
Source:http://www.mhcmp.com
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