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    The application of cathodic electrophoretic painting at home and abroad and development of

    Introduction

        Electrophoretic coating from the 20th century, 30 years, from the 20th century began to study the mid-60 synthetic cationic resin, and in the early 20th century, 70 can be used for corrosion resistance and high requirements for household electrical appliances primer, and then gradually developed a higher corrosion resistance and has a decorative effect of the cathodic electrophoretic coating, because of its excellent corrosion resistance, high penetration rate in swimming, high-leveling, high decorative coating and a high degree of automation, painting and less pollution and so on, a wide range used motor vehicle industry, and promote the use of building materials, light industry, household appliances and other industrial fields as well as hardware and handicrafts of the surface anti-corrosion and decorative.

        A cathodic electrophoretic characteristics of

        1) with the traditional solvent-based paints and other dipping, spraying water-based paint baking compared to cathodic electrodeposition coating with incomparable advantages: Tu primer process can be realized fully automated, applicable to large water production; obtain uniform The film thickness; Throwing good, improve anti-corrosive inner cavity of the workpiece, in particular the corrosion resistance of cathodic electrophoretic coating; coating efficiency is high; security is relatively high, is a low-pollution coating; film look good , drying, better flattening of.

        2) Compared with the anodic electrophoretic painting, it has the following advantages: The anodic dissolution of coated material does not occur, so that the coating and the substrate adhesion and anti-corrosion were increased; paint base contains a substrate to prevent corrosion of the group (such as nitrogen-containing groups), corrosion resistance and Throwing Power is higher than the anodic electrophoretic paint, thereby being painted objects coated cavity and the weld swimming better.

        Two cathodic electrophoretic coating applications

        At present, the world's automobile production, 92% used paint (ED), of which 90% of the use of cathodic electrodeposition coating (CED). With Ford and General Motors, for example, from the beginning in January 1977 voted to build cathodic electrophoretic coating line auto body So far, these two companies accounted for the cathode electro-coating line of auto body painting line 9900; and various Japanese auto companies in the international marketplace competitiveness, after the United States in October 1977 voted to build the first auto body cathode electrophoresis line is still, there are more than 95% of the car body using cathode electrophoresis coating line. China's automobile industry in the mid-20th century, 80 Application of cathodic electrophoretic paint, now the second car factory Dongfeng Motor body, Volkswagen Santana, as well as Audi, logos and other car body using 100% cathodic electrophoretic paint, other issues such as auto parts, carriages, frame, etc., in order to enhance the service life of these thin pieces, but also have used a high corrosion resistance of cathodic electrophoretic paint. For example, newly developed high-leveling cathodic electrophoretic coating, has been used in the U.S. auto manufacturers. Representative products are PPG, Inc. (Pittsburgh, Flat Glass Company) Edll thick cathodic electrophoretic Xu Liu, Edl2 in the thick cathodic electrophoretic paint, DuPont CormaxTM thick thick-film or the cathodic electrophoretic paint, the main performance improvements is to make film surface roughness decrease.

        As the cathodic electrophoretic coating with excellent anti-corrosion, permeability and decorative properties, not only applied in the automotive industry, it is also widely used in other industries. Such as building materials, fire doors, steel window coating such as weather and good pairs of cathodic electrophoretic coating of epoxy coating, steel furniture and partitions the use of acrylic resin materials, the Department of cathodic electrophoretic coating. In the hardware industry, electrophoresis locks, metal spectacle frames, bicycle parts, stationery, leather buckles, lighters and other items, have achieved satisfactory results.

        In addition, CED also applied to the deposition of metal oxides and metal membranes to gain some kind of special performance materials. For example, ZnCo204 electrophoretic deposition of nickel as a matrix of electrodes for oxidation catalysts are able to obtain good catalytic and mechanical stability of the electrode. Preparation of the solid-state pyrolytic reaction of high purity zinc oxide powder by electrophoresis deposition method to generate high-quality zinc oxide thin films, this film can be at room temperature, emits a wavelength of 390nm ultraviolet light.

        3 foreign cathodic electrophoretic Development Overview

        Cathodic electrophoretic coating was first applied in the United States. Early in the 20th century 6. The mid-German BASF Company and the U.S. company was the first conducted PPG cationic resin (ie, cathode electrophoresis studies). 1971 U.S. PPG companies began applying the first generation of cathodic electrophoretic paint. First in Philip the company's refrigerators, washing machines and drying machines that require high corrosion resistance of household appliances to make primer. In June 1976 the U.S. General Motors auto parts companies will use PPG's second-generation cathodic electrophoretic paint (CED-3002u) to be successful. Officially in 1977 as a primer with cathodic electrophoretic paint for painting vehicle bodies. In 1978 the U.S. General Motors Corp. and Ford Motor Company is basically the original use of 65 Anode electrophoretic coating production line to switch to the new cathodic electrophoretic coating production line. Japan and the United Kingdom in 1977, the company imported technology from the United States PPG after their car painting from 1978-1979 are also converted to the cathode electro-coating. To the end of 1978 preliminary statistics, the world's approximately 120 cathode electrophoresis coating line, which the United States for more than 70, Japan 20, Europe 10.

        Because the United States, Japan, Germany and many other paint company's relentless development of the 20th century, 80 years cathodic electrophoretic coating has also obtained a number of new achievements. One of the most representative is [121 thick-film cathode electrophoresis coating, low temperature curing cathodic electrophoretic coating and cathodic electrophoretic paint color. 80 in the late 20th century, the international community to form the three major systems: the United States, beginning with PPG's anti-corrosion cationic electrophoretic coating; to Germany's Hoechst company as a pioneer of cars, trucks cationic electrophoresis primer; to Japan God East Kansai Paint Company, represented by improved cationic electrophoretic coating.

        The 20th century, after 90 years in succession and the development of a variety of high performance of the cathodic electrophoretic coating, electrophoretic coating, such as UV-curing, self-layered cathodic electrophoretic coating, rust-proof corner cathode electrophoresis coating.

        3.1 UV-curable electrodeposition coatings

        Ultraviolet (UV) curable coatings is the use of ultraviolet light coating resin, the curing reaction occurs polymerization bridging mode at low temperature can be done within a short time under the conditions of the curing process. It can improve production efficiency, both energy conservation, prevention of environmental pollution and many other advantages. UV-curable coatings because of its low curing temperature, in addition to the application of general electrophoretic coating products that are also used as a decorative metal coatings, corrosion, metal evaporation membrane protection, heat easily deformed material of the coating and electronic products and closed on the precision products, printing and other processing. Study at home and abroad cathodic electrophoretic coating, UV curing the matrix resin mainly in acrylic resin, epoxy resin and polyurethane.

        3.2 Self-stratifying cathodic electrophoretic coating

        Self-stratifying coatings refers to coatings on the substrate after the first construction can be a direct result of spontaneous phase separation, in the film-forming process is divided into two different functions of a continuous coating to form a composite coating of different systems, each layer shows different features. Such a construction of the multi-layer coating, not only saving labor, but also solve the multi-layer coating system adhesion problems between layers. The mechanism has the following categories: gravity mechanism, selective wetting mechanism, a different mechanism of penetration rates, pigment wetting mechanism, interfacial tension gradient mechanism, compared with shrinkage mechanism is now on the market research and development of weathering cathodic electrophoretic coating on the part of self-stratification A coating. A key component of this coating resins for the epoxy resin and acrylic resin, using two different surface tension, surface tension, when a large baking epoxy resin sinks lower, the surface tension of a small float on the surface of acrylic resin layer, forming a weather resistance and corrosion resistance are good "bottom one"-type cathodic electrophoretic coating.

    3.3 corner rust-type cathodic electrophoretic coating

        Vehicle bodies and parts in the stamping of different sizes formed in edge and sharp corners. The corner in the painting, due to poor coverage, easy to rust. In the electrophoretic baking, due to decreased viscosity of the coating resulting from heat flow, coupled with the role of surface tension, so that the corners become visible. Therefore, raising the corner coverage, but the smoothness of the coating is compromised. To resolve this contradiction, the Japanese oil company used high molecular weight resin as a coating to adjust the flow of heating agent, and through rheology control technology, so that Xu membrane covering the corners and surface smoothness to be taken into account, the successful development a corner-type anti-rust paint. This coating in the coating melt, due to high molecular weight resin, the role of additives inhibit the thermal mobility of the coating to achieve curing temperature, due to the melting of the resin itself and the cross-linking reaction to form a uniform coating.

        From the development of cathodic electrophoretic coating of view, the general trend is: film thickness from thin to thick, swimming penetration rate from low to high, high to low content of organic solvents, drying temperature high to low.

        4 the development of domestic cathodic electrophoretic profile

        In China in 1976 cathodic electrophoretic painting studies. The first generation of cathodic electrophoretic coating of weapons by the then Institute of the Ministry of 54 (now 59) was first developed in 1979, and in military products to a certain application. Followed by Shanghai paint, paint by Lanzhou, Shenyang, Beijing, Tianjin and other large and medium sized paint factory has also done a lot of the development of cathodic electrophoretic coating development work. In the "Sixth Five-Year" period of China's paint industry from Japan, Australia and the United Kingdom introduced a cathodic electrophoretic coating manufacturing technology and coating technology. A few years ago in China one after another from the United States, Germany, Italy and other countries the introduction of advanced coating technology and coating equipment. The first modern production vehicle body water cathodic electrophoretic coating production line in July 1986 in First Automobile Works Body Works production. Followed by a second car manufacturing plant, and the cathode electrophoresis line in Jinan body put into operation one after another, in China's automobile industry has formed a cathodic electrophoretic coating Anodic electrophoretic coating alternative to the trend. The end of 1990 were completed and put into the cathode electro-coating line of the 21 (including body painting line 16). That has been put into operation until the end of 1994 nearly 40, there are a few production capacity of 100,000 or more cathode electro-coating line (FAW-Volkswagen, a Volkswagen Shanghai, Tianjin and other large trough Xiali electrophoresis line). By 1999, dozens of production lines in China has been put into production, only 100,000 more than the cathode electro-coating line will have five or more (such as: First Auto Works Volkswagen Co., Ltd., Shanghai Buick Motor Co., Ltd., the 100 tons of electrophoresis tank production line) was put into operation before the year 2000. Cathodic electrophoretic paint today, accounting for most of the automotive paint market.

        5 direction of development of cathodic electrophoretic coating

        Cathodic electrophoretic coating after 30 years of development, the international community to the United States and Germany, PPG's Herberts paint companies on behalf of suppliers continue to adopt new technologies, develop new products, so that continuous upgrading electrophoretic paint. A new generation of cathodic electrophoretic coating should have the following characteristics:

        1) a new generation of cathodic electrophoretic coating of swimming and further enhance the penetration rate. Throwing higher the rate of more uniform thickness within the body so as to enhance the overall anti-corrosive body, reducing the construction voltage, reduce paint usage.

        2) to improve the edge corrosion protection. Electrophoresis process, some marginal effect due in part to the electrochemical coating, resulting corner special coating is thin, and thus corrosion occurs easily here, by improving anti-corrosion coating performance capabilities.

        3) reducing the Yanji ratio. Yanji is the paint than the proportion of pigment and resin, reducing it can increase the resin content, improving the liquidity of paint to reduce the whole rate of colloid deposition, reducing pigment flocculation and protection of the pump, reduce material consumption.

        4) Reduce the amount of solvent. The higher the solvent content greater environmental pollution is not conducive to work. It is advantageous to reduce protection of the environment, saving investment.

        5) Lead-free Wuxi, more environmentally friendly. Lead in the electrophoretic paint anti-corrosion catalyst, passivation and accelerated cross-linking, etc. plays an important role, but lead paint on the bare steel anti-corrosion a great impact, and the lead itself is highly toxic element, and environmental protection on the its limitations the hard way. The performance of tin and lead closer, usually mix the two. A new generation of electrophoretic coating resins by improving the removal of lead and heavy metals, more environmentally-friendly coating cathodic electrophoretic coating uniformity and excellent corrosion resistance, productive, and low-polluting nature of the future development of the coating plays an active role, it as a coating process in metal surface treatment protection, decoration widely used. Therefore, the cathodic electrophoretic coating in coating development and application of the pioneering field has a great potential.

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