Paint classification: conductive paint

Core tip: anti electromagnetic interference shielding coating Commonly known as: conductive paint The conductive paint uses composite particles such as copper and silver as conductive particles, which has good conductivity Anti electromagnetic interference shielding coating Commonly known as conductive paint Category paint Property special functional coating function Conductive coating is a kind of special functional coating with the rapid development of modern science and technology It has a history of about half a century Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: anti electromagnetic interference shielding coating Commonly known as: conductive paint The conductive paint uses composite particles such as copper and silver as conductive particles, which has good conductivity Anti electromagnetic interference shielding coating is commonly known as conductive paint category paint property special functional paint functional conductive paint is a special functional paint developed rapidly with modern science and technology, which has a history of about half a century In 1948, the United States issued a patent to make conductive adhesive from silver and epoxy resin, which is the first conductive coating to be disclosed China also began to research and apply conductive coatings in the 1950s In recent decades, conductive coatings have been applied in many military and civil industries, such as electronics, electrical appliances, aviation, chemical industry, printing, etc Accordingly, the theoretical research of conductive coatings has been developed rapidly, and promoted the maturity and perfection of application technology Conductive paint is a kind of paint that can be used for spraying It can play a conductive role after drying to form a paint film, so as to shield electromagnetic wave interference Shielding is to isolate the metal between two space areas, so as to control the induction and radiation of electric field, magnetic field and electromagnetic wave from one area to another Specifically speaking, shielding body is used to surround the interference sources of components, circuits, assemblies, cables or the whole system to prevent the external diffusion of interference electromagnetic field; shielding body is used to surround the receiving circuit, equipment or system to prevent them from being affected by external electromagnetic field Conductive paint is a kind of paint that can be sprayed by adding conductive metal powder to specific resin raw materials According to the application characteristics, the types of conductive paint can be divided into four categories: 1 Paint used as a conductive body, such as: hybrid integrated circuit, printed circuit board, keyboard switch, winter heating and automobile glass Anti frost heating paint, ship antifouling paint, etc 2 Radiation shielding coating, such as radio wave and electromagnetic wave shielding 3 Antistatic coating 4 Others, such as electrochromic coating, photoconductive coating For the conductivity of conductive coating, there are three characteristics: volume resistivity or conductivity; surface resistivity; electrostatic decay rate Intrinsic conductive coating is a kind of conductive coating made of intrinsic conductive polymer as film-forming material The preparation methods of conducting polymer used in conducting coating mostly focus on the direct use of conducting polymer as film-forming resin, the mixed use of conducting polymer and other resins, and the use of conducting polymer materials as conductive fillers, among which polyaniline, polypyrrole, polythiophene and Polyquinoline are the most typical research fields The intrinsic conductive coating is mainly used in anti-corrosion and anti-static coating, absorbing coating, electromagnetic shielding coating and so on Dopant dopant conductive coating is a kind of coating with conductivity of more than 10-12s / m, which is based on polymer and conductive material It not only has the conductive function, but also has many excellent properties of polymer It can adjust the electrical and mechanical properties of the coating according to the needs of use in a large range, and has low cost, simple and easy operation, so it has been widely used The dopant type conductive coating is composed of polymer, conductive filler, solvent and assistant The commonly used conductive fillers include metal system fillers, carbon system fillers, metal oxide system fillers, composite fillers, new nano conductive fillers, etc (1) Carbon system conductive coating carbon system conductive coating is a kind of functional coating with large amount, which has the advantages of low cost, light weight, high structure, innocuity and so on The conductive fillers used as carbon conductive coatings mainly include graphite, graphite fiber, carbon fiber, high temperature calcined petroleum coke, various carbon black and silicon carbide, etc In particular, the conductive polymer filled with carbon black has been widely used, because the conductive carbon black has the advantages of low price, small density, not easy to settle and strong corrosion resistance, but the conductivity is relatively poor; at the same time, because the surface contains a large number of polar groups, it is difficult to disperse, easy to flocculate and other shortcomings, one of the most simple and effective solutions is to add dispersant to reduce the absorption between carbon black particles Gravity and cohesion, so that it can be evenly and stably dispersed in the matrix Carbon based conductive coatings are usually composed of conductive fillers, matrix resins, auxiliaries and solvents After mechanical mixing, they are coated on the surface of non-conductive substrate to form a special curing film, which produces conductive effect (2) Graphite conductive coating graphite is a kind of high conductive layered material, which can be used as conductive filler and compounded with conductive polymer to prepare polymer matrix composite with excellent conductivity Graphite coating, with its good conductivity, low price and simple operation, has an irreplaceable position in the inner and outer coating of the color tube glass shell In order to make the coating have good conductivity, it is necessary to prepare high-purity ultra-fine graphite through deep processing to meet the needs With the development of nanotechnology, the conductive polymer materials made of graphite nano materials and matrix are rising day by day As a new type of conductive filler, expanded graphite has the advantages of good conductivity, small friction loss, small pollution and so on Moreover, the addition of expanded graphite can greatly improve the conductivity of polymer materials and reduce its conductive percolation value Therefore, in antistatic coatings and conductive coatings Polymer composites have important application value (3) The conductivity of metal conductive coating depends on the type and quantity of metal filler, the type and quantity of metal fiber and metal powder, and the shape of filler Metal fillers mainly include silver powder, nickel powder and copper powder, among which silver powder has good chemical stability, excellent anticorrosion performance and high conductivity, which is an early developed conductive filler However, because of the high price of silver powder, it is mostly used in military field and less in civil use Nickel powder is widely used because of its good chemical stability, effective anti electromagnetic interference performance and moderate price Copper powder has low price and conductivity similar to silver Its disadvantage is that copper is easy to oxidize and its conductivity is not stable But after special surface treatment, stable copper-based conductive coating can be obtained With the improvement of anti-oxidation technology of copper powder, the research of copper-based conductive coating will be further concerned (4) Nanotube conductive coating nanotube has a great length diameter ratio and excellent electrical properties When it is added to the polymer as a reinforcing phase, it can greatly improve the mechanical properties and photoelectric properties of the polymer Therefore, it can be used in the preparation of functional carbon nanotubes / polymer conductive coating and applied in many fields Nano tube conductive materials and film-forming materials penetrate each other with almost the same order of particle size, and there is no obvious interface between them Therefore, the anti-corrosion performance of nano tube conductive coating is better than that of general anti-corrosion coating (5) Because of its excellent electrical properties and light color, metal oxide conductive coating can better compensate for the poor corrosion resistance of metal conductive pigment and poor decoration performance of carbon conductive pigment Commonly used composite fillers include glass beads, copper powder and mica powder coated with silver powder and carbon black coated with nickel powder Metal oxide conductive pigments are mainly doped with tin oxide, zinc oxide, antimony dioxide, etc., among which SnO2 is the representative Because of its low density, good stability in the air, light color and the advantages of transparent coating, it is paid attention to Working principle conductive paint can absorb, conduct and attenuate electromagnetic wave like metal on completely insulated non-metallic or non-conductive surface by spraying and brushing, so as to shield electromagnetic wave interference The appearance of conductive paint effectively solves the problem of electric connection on non-metallic surface Conductive paint is a kind of anti electromagnetic interference paint made of electroplated silver particles It is single component, labor-saving, time-saving, convenient, with good adhesion, flat, strong cohesion, and no loose particles It can be used for spraying materials of mobile phones, calculators, precision instruments, etc with metal and composite materials as the base materials After drying and curing, the performance of the paint layer is stable The fine and smooth spray on the surface of the workpiece has the same excellent conductivity as the pure silver conductive paint, and the fine conductive particles ensure the safety of the electronic components In order to ensure the adhesion between the paint and the base surface, under normal circumstances, conductive paint is only recommended to be used on the surface of non-metallic materials such as PC, ABS, etc if it is used on the surface that is not commonly used, it may need to be used with primer Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,