Conductive Coating - Conductive Paint

Anti-electromagnetic wave interference shielding paint. Commonly known as: conductive paint. Conductive paint is a kind of paint that contains copper, silver and other compound particles as conductive particles, and has good conductive properties.

Overview

Conductive paint is a modern science and technology and the rapid development of special functional coatings, about half a century of development history. 1948, the United States announced the silver and epoxy resin into a conductive adhesive patent, which is the earliest public conductive coatings. China also began to research and apply conductive coatings in the 1950s. In recent decades, conductive coatings have been in the electronics, electrical, aviation, chemical, printing and other military, civilian industrial applications. Accordingly, the theoretical study of conductive coatings has also been rapidly developed, and to promote the application of increasingly mature and perfect technology.

Function

Conductive paint is the use of conductive metal powder added to specific resin materials in order to make paint coatings that can be sprayed, dried to form a paint film can play a role in the conductivity, thereby shielding the function of electromagnetic interference.

Shielding is the isolation of metal between two spatial areas to control the electric field, magnetic field and electromagnetic waves from one area to another area of induction and radiation. Specifically, the shield is used to surround the meta-parts, circuits, assemblies, cables or the entire system with interference sources to prevent the spread of interference electromagnetic fields outward; and the shield is used to surround the receiving circuits, equipment or systems to prevent them from being affected by external electromagnetic fields.

Types

Classified according to application characteristics.

1. Coatings used as conductors, such as: hybrid integrated circuits, printed wiring boards, keypad switches, heating paint for winter heating and frost protection of automobile glass, anti-fouling coatings for ships, etc.

2. Radiation shielding coatings, such as radio waves, electromagnetic wave shielding.

3. Anti-static coating

4. Other, such as electrochromic coating, photoelectric conductive coating.

For the conductive properties of conductive coatings, there are usually three kinds of characterization: volume resistivity or conductivity; surface resistivity; electrostatic decay rate.

Working principle

Conductive paint by spraying, brushing method, so that completely insulated non-metallic or non-conductive surface has the same characteristics as metal absorption, conduction and attenuation of electromagnetic waves, thereby playing a role in shielding electromagnetic interference. The emergence of conductive paint has effectively solved the problem of achieving electrical connection on non-metallic surfaces.

Conductive paint is an anti-electromagnetic wave interference paint made of electroplated silver particles, single component, labor-saving, time-saving, convenient, good adhesion, flat, strong cohesion, no loose particles, can be used for metal, composite materials for the substrate of cell phones, calculators, precision instruments, such as the inner wall of the shell spraying materials. After drying and curing the paint layer performance is stable, sprayed on the surface of the workpiece fine and smooth and pure silver conductive paint has excellent conductive properties, fine conductive particles to ensure the safety of electronic components.

In order to ensure the adhesion ability of the paint and the substrate, under normal circumstances, the conductive paint material is only recommended for use on the surface of PC, ABS and other non-metallic materials, if used on uncommon surfaces, may require priming agent with the use.