General knowledge of coatings: research and development of new conductive coatings

Abstract: conductive coating is a kind of special functional coating According to the conductive principle, it can be divided into composite conductive coating and structural conductive coating Composite conductive coatings can be made up of many components, such as butadiene emulsion, low temperature interlinking agent, conductive carbon black and water This paper mainly introduces the research and development of composite conductive coatings and the development direction of conductive coatings at home and abroad Key words: research and development of conductivity of new conductive coatings Conductive coating is a kind of special coating applied on high resistivity polymer materials, which can conduct current and eliminate accumulated static charge It can be applied on the surface of substrate of any shape 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 Abstract: conductive coating is a kind of special functional coating According to the conductive principle, it can be divided into composite conductive coating and structural conductive coating Composite conductive coatings can be made up of many components, such as butadiene emulsion, low temperature interlinking agent, conductive carbon black and water This paper mainly introduces the research and development of composite conductive coatings and the development direction of conductive coatings at home and abroad Key words: new conductive coating conductivity R & D conductive coating is a special coating applied on high resistivity polymer materials, which can conduct current and eliminate accumulated static charge, and can be applied on the surface or inside of any shape of substrate According to the composition and conductive mechanism, conductive coatings can be divided into two categories: structural (also known as intrinsic) conductive coatings and composite (also known as additive) conductive coatings The conductive material of structural conductive coating is polymer itself The conductive material of the composite conductive coating is the conductive material (metal, graphite, etc.) added to the insulating polymer It makes use of the conductive effect of the conductive material to make the polymer have the conductive performance In recent years, the demand for power equipment is increasing, especially for various cables At present, there are 6400 cable manufacturers in China, which can produce hundreds of varieties ranging from high-voltage transmission cable, nuclear power plant cable, optical cable and civil cable Among them, high-voltage transmission cable, nuclear power station cable, hydropower station cable and optical cable are products with large consumption and high added value Conductive coating is an important coating of various cables The development of new conductive coating is a directional topic in the field of cable production 1、 Research status and development trend at home and abroad conductive coating has been widely used, so it has been widely concerned in the world In this respect, foreign products are relatively mature At present, China also attaches great importance to the research of conductive coatings, and there are several domestic research institutions engaged in this field The common epoxy resin, polyurethane, phenolic, polyimide and acrylic acid are used as the base materials The conductive filler is generally silver, copper, nickel and other metal powder, carbon, graphite and other non-metal powder, and the application effect of the product is not very ideal Our factory has successfully developed new conductive coating materials through many years, breaking through the traditional process methods, and adopting the special raw materials and auxiliaries such as butadiene emulsion and cross linking agent developed by ourselves The new conductive coating produced by this technology is the first of its kind at home and abroad, and its products fill the gaps in China From the laboratory research and cost analysis of our factory, it is shown that the quality and performance of the semi conducting resistance water tape and semi conducting shielding tape made of our new conductive coating materials are comparable to those of the imported products, while the price is only about half of the imported products, so the cost performance ratio has obvious advantages Our factory has made market survey to foreign users through sales channels At present, foreign businessmen from Germany, India, Singapore, etc want to buy our products Therefore, the new conductive coating material is a new generation of conductive coating with high added value and advanced technology It can meet the needs of the production and development of semi conductive resistance water belt and semi conductive shielding tape in the domestic cable industry, and can greatly promote the promotion of the cable industry in China 2、 The development direction of conductive coatings 1 With the increasing demand of conductive coatings, the cost of low-cost conductive materials will be an important factor affecting the development of conductive coatings in the future It is an effective method to develop conductive polymers and modified conductive fillers The composite conductive coating has the advantages of simple preparation, low investment, low consumption and low cost At present, most of the modified conductive fillers are electroless plating, such as silver plating on the surface of copper powder and copper plating on the surface of graphite In addition, the application of nanotechnology has greatly reduced the cost Such as nano silver powder and nano nickel powder, they not only reduce the cost, but also improve the conductivity This is also one of the development directions of research and development of conductive coatings 2 With people's attention to environmental quality and resources, environmental conductive coating is the inevitable trend of future development At present, there are mainly water-soluble conductive coatings, high solid content conductive coatings and powder conductive coatings Organic solvent based conductive coatings are not only costly, but also harmful to the environment and construction personnel, which will be eliminated in the future development Water soluble conductive coating uses water as solvent or dispersion medium, which reduces its harmfulness The conductive coating with high solid content has less organic solvent, which reduces the harm to environment and human body The powder conductive coating is completely solid system without solvent, and can be produced by closed-loop system 3 With the development of conductive coatings, the multi-functional conductive coatings not only require excellent conductivity, but also put forward requirements for its wear resistance, corrosion resistance, aging resistance, high temperature resistance and low temperature resistance The future conductive coatings should be the combination of conductivity and other properties At present, the function of some conductive coatings studied in our country has developed from the single electrostatic conductive coating to the current conductive coating, anticorrosive coating, high temperature resistant coating and flame retardant coating The conductive anti-corrosion, heat-resistant and flame-retardant coating is made up of Chloroether resin as the main component, self drying silicone resin as the auxiliary, polyaniline doped and conductive mica as the conductive filler and some additives This kind of conductive coating not only has excellent electrostatic conductivity, but also has corrosion resistance, high temperature resistance and fire resistance 3、 Key technology and technical index of conductive coating 1 Main key technology The material selection of new conductive coatings introduced in this paper is mainly from butadiene emulsion instead of commonly used resins such as epoxy resin, polyurethane, phenolic resin, polyimide, acrylic acid, etc., as well as the self developed cryogenic cross linking agent as the matrix component, which increases the bond strength and improves the dispersibility The selection and the stability of the product are also the key points of this study 2 the main technical indicators The new conductive coating consists of butadiene emulsion, low temperature interlinking agent, conductive carbon black and water The product is 30% aqueous solution and 50% aqueous solution, for example Its technical performance indexes can be achieved as follows: the appearance is a black fluid mixture, non-toxic and tasteless; the specific gravity is 0.8321kg/l; the volume resistivity (Ω Cm) is 0.48; the volume conductivity (s.cm-1) is 2.02; the adhesion is level 2; the impact strength (J) is 5.2; the contact dry time (min) is 68 Four, the production process specification for the production of conductive coatings new materials, in the process of research and development, the butadiene emulsion is added to the reactor, slowly adding the mixture of conductive carbon black and water, mixing and mixing, adding low-temperature chain agent and stabilizer, stirring and mixing at high speed The main raw materials of the new conductive coatings developed by this research are butadiene emulsion, conductive carbon black and chain crosslinking agent, which are harmless to the environment Among them, conductive carbon black is safe and non-toxic, harmless to human and livestock Butadiene emulsion is high molecular polymer waterborne emulsion, non-toxic, tasteless, safe and stable The chain crosslinking agents are macromolecular aqueous solutions, which are safe, non-toxic and stable in storage The new conductive coating material is made of the above raw materials by mechanical mixing, which is a physical process and does not produce toxic and harmful substances The final product is a non-toxic, tasteless and stable black mixture, harmless to people and animals There is no "three wastes" in the production process, which will not pollute the environment 5、 Conclusion as a new type of special functional coating, conductive coating has been widely used in production, life and military With the progress of science and technology, our demand for conductive coatings will increase At the same time, the requirement for its performance is no longer a single pursuit of conductivity, but also for corrosion resistance, impact resistance, aging resistance, high and low temperature resistance In the future, conductive coatings should be multifunctional composite coatings The research and development of conductive coating has a long-term significance for China's economic construction and national defense construction This new conductive coating has a broad application prospect, especially in the field of cable production Reference [1] Chen Lijun, et al Research status and development trend of conductive coatings [J] Synthetic resins and plastics, 2004, 21 (6): 71 [2] Jing Yuanbin, et al Synthesis, structure, performance and application of conductive polyaniline [J] Journal of polymers, 2005 (5) 655-661 [3] Gu Yaxin, et al Development of Polyaniline / epoxy electrostatic conductive coatings [J] New building materials, 2007 (5) 20-22 [4] Liu Yijun et al Study on the preparation of polyaniline anticorrosive conductive coating [J] Coating industry, 2007, 37 (6) 16-19 Coating house is 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