It is expected that conductive coating technology will be applied in many fields
- Release date:
With the rapid development of modern science and technology in China, the application of conductive coatings and application areas also increased, it is understood that in 1948, the United States announced the silver and epoxy resin made of conductive adhesive patent, which is the first public conductive coating. China also began to study and apply conductive coatings in the 1950s.
In recent years, China's conductive paint research and development has made great progress, have developed a variety of strong conductive conductive coatings, such as ultra-fine silver conductive paint; silver-plated copper powder as filler, epoxy - polyurethane Conductive coatings for the main film-forming materials; conductive coatings with good electromagnetic shielding performance prepared with low cost and high oxidation resistance copper powder; electromagnetic shielding conductive coatings for military, home appliance and aerospace industries; Electrostatic shielding of materials such as conductive coatings. Oshari company developed a series of electromagnetic wave conductive coating, the resistance value can reach 40mQ.
At present, some domestic scientific research units and institutions of higher learning are actively developing and developing comprehensive performance better conductive coatings, with the fastest speed to shorten the application of high-performance conductive coatings with foreign gap.
The development of conductive coatings abroad
Conductive coating in accordance with whether to rely on external conductive filler to achieve the conductive function can be divided into structural conductive coating and blended conductive coating, due to the superiority of blending conductive coating performance, early conductive coating research and development focused on blending Type conductive coatings, and many have been commercialized and are still the focus of research and development in each country.
For a long time, conductive coatings have been prepared by adding filler particles with good electrical conductivity to achieve the conductive function. Until 1976, the University of Pennsylvania reported that the incorporation of iodine in the insulating polyacetylene, into the conductive properties of polymerization After the scientists, scientists began to research and development of structural conductive coatings. So far, only sulfur nitride can be called purely conductive properties of the matrix resin, other can be used as the intrinsic conductive coating matrix resin most of the need for chemical reaction process in order to achieve a strong conductivity. The experimental results show that the epoxy resin conductive coating is prepared from the polyaniline doped with epoxy resin and camphorsulfonic acid. When the percentage of polyaniline is between 0.6% and 0.9%, the coating thickness At 200um, the conductivity of the coating can reach MO-'S / cm. At this time, the coating not only has good antistatic properties, but also has good corrosion resistance to metal surface such as steel.
Foreign nano-conductive coatings and fabric conductive coatings on the research and development also gave enough attention. Nano-type electromagnetic shielding conductive coating application of the latest surface chemical technology, the use of new polymer as the main film-forming material, filled with nano-conductive metal powder, high-speed dispersion, the coating of both metal powder high conductivity, And electromagnetic shielding effectiveness, but also has a good color and adhesion performance. Nano-composite conductive coatings were prepared by adding solvent and various functional additives for paints.
This composite conductive coating is easy to construct and can use conventional coating processes. And curing drying time is short, in the plastic and other polymer materials have a good surface adhesion performance. Anti-mechanical stress of the conductive coating by the water dispersion (polyurethane content of more than 50%) and the core is not conductive, shell conductive powder composition. 100.0 parts of cationic polyester-polyurethane having a mass fraction of 30% and 0.5 to 1.0 part by mass of hydroxymethylcellulose and WW3 having a pH between 9.9 and 9.5 were mixed, 60.0 parts by mass of silver-plated borate glass particles were added, In 150 degrees Celsius dry curing film, made of fabric with conductive coating, conductive current can reach 1.8A, showing excellent anti-static performance.
With the development of conductive paint research and development technology increasingly mature, more successful development of new conductive coatings, will contribute to more areas.