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 the coating structure is divided into two coating and one drying and two coating and two drying. Process flow    color coated steel sheet is a product made of cold rolled steel sheet and galvanized steel sheet as substrate, surface pretreatment (degreasing, cleaning, chemical conversion treatment), continuous coating (roll coating), baking and cooling. The main production process of the common two drying continuous color coating machine is as follows: uncoiling → pretreatment → coating → baking → post-treatment → coiling. 1、 Substrate for color coated steel plate:    the types of color coated steel plate classified by substrate are as follows: color coated steel plate, cold rolled substrate color coated steel plate, hot-dip galvanized color coated steel plate, hot-dip aluminized zinc coated steel plate, 5% aluminized zinc coated steel plate, 55% aluminized zinc coated steel plate, electro galvanized color coated steel plate, others, printed color plate, metal embossed color plate. 1. Cold rolled base plate color coated steel plate the color plate produced by cold rolled base plate has smooth and beautiful appearance, and has the processing performance of cold rolled plate; however, any small scratch on the surface coating will expose the cold rolled base plate to the air, so that the exposed iron will soon generate red rust, so this kind of product can only be used for temporary isolation measures and indoor materials with low requirements. 2. Hot dip galvanized color coated steel plate the product obtained by coating agricultural production system coating on hot dip galvanized steel plate is hot dip galvanized color coated steel plate. In addition to the protective effect of zinc, the surface of hot-dip galvanized color coated sheet can be coated by agricultural production systemThe coating also has the function of insulation and protection against rust, and its service life is longer than that of hot-dip galvanized sheet. The zinc content of hot-dip galvanized base plate is generally 180g / m2 (double-sided), and the zinc content of hot-dip galvanized base plate for building exterior is 275g / m2. 3. There are two kinds of hot-dip aluminum zinc coated steel plate as color coated substrate: 55% AI Zn and 5% AI an. 4. Galvanized color coated sheet: galvanized sheet is used as base plate, coated with agricultural production system coating, and baked product is galvanized color coated sheet. Because the zinc layer of galvanized sheet is thin, the zinc content is usually 20 / 20g / m2, so the product is not suitable for outdoor production of walls, roofs, etc. But because of its beautiful appearance and excellent processing performance, it can be mainly used for household appliances, audio, steel furniture, interior decoration, etc. Baosteel az150 aluminum zinc coated coil No.2, coating for color coated sheet production is a kind of agricultural production system in flowing state or powder state, which can be dried and solidified to form a thin film on the substrate, evenly covered and well adhered. Its main properties are protection (such as moisture resistance, water resistance, weather resistance, chemical resistance, etc.) and decoration (with different colors and luster). 1. Composition and function of coatings    all kinds of coatings are composed of four parts, namely resin, pigment, solvent and auxiliary. The solvent is volatile, and the other three parts are basic components. 1) Resin: resin is the film-forming material, which is the main component and basis of coating, also known as base material. It determines the film propertiesThe main factors that affect the quality of life. It is required that the resin used as the film-forming material should be quite stable during the storage period of the coating, without obvious physical and chemical changes; when forming the film, it can form the film rapidly under the specified conditions. There are many kinds of resins. Acrylic resin, epoxy resin, polyester resin and polyurethane resin are commonly used in coil coatings. Different resins have different physical and chemical properties, weather resistance and corrosion resistance. (2) Pigment: pigment must be used together with resin. The main function of pigment in coating is to color the film. Different proportion of pigment will affect the hardness, gloss and corrosion resistance of the film. (3) Solvent: solvent is an important part of liquid coating, which can be volatilized in the process of coating drying. Generally, the solvent is also used to adjust the viscosity of coatings. The solvent used to adjust the viscosity of coatings is called diluent. Solvent has a great influence on the manufacture, storage, coating, film formation and film quality of coatings. (4) Additives: additives are a small amount of additives added to improve the performance of coatings. For example, some can improve the performance of coating and film, some can improve the drying time, and some can prevent the film from morbid. There are many kinds of additives, mainly including drying agent, curing agent, leveling agent, defoamer, matting agent, stabilizer, etc. Almost the vast majority of liquid coatings are composed of some raw materials in the above four components, among which the main one is resin, which is indispensable for any coating. It can be said that resin (sometimes with solvent and additives) is transparent paintIn the pigment can be a variety of paint. Coatings for color coated steel plate are generally divided into two types according to their uses: Construction and household appliances. Architectural coatings are selected from epoxy resin, polyester resin, polyvinyl chloride plastic sol, silicon modified polyester and polyfluoroethylene according to different application environment. Polyester resin is generally used as coatings for household appliances. Primers include epoxy, polyester, acrylic and polyurethane. Generally, the primer is selected according to the application, application situation, processing degree and matching with the topcoat. The film thickness of the primer is usually 5-7um. Baosteel az150 aluminum zinc coated coil    (1) the epoxy primer has good adhesion to the substrate, water resistance, alkali resistance and chemical corrosion resistance. It is an early primer for coil, and its flexibility is not as good as other primers. (2) Polyester primer has good adhesion to the substrate, good flexibility, sensitive to humid environment, and less chemical resistance than epoxy primer. (3) Water soluble acrylic primer has good adhesion to the substrate, good flexibility, low solvent content in agricultural production system and low temperature curing. (4) Polyurethane primer has good chemical resistance, durability and flexibility. 2. The performance difference of different color coated sheet:    (1) the difference between galvanized sheet and aluminized zinc sheet: compared with aluminized zinc alloy, the chemical property of galvanized sheet is relatively active, so the anti-corrosion ability is quite different. The test results under the same outdoor conditions show that the service life of the aluminized zinc sheet is more than four times of that of the galvanized sheet. (2) The surface paint materials are different, and the surface paint resins are polyester resin (PE),Strengthened silicified polyester resin (SMP) and polydifluoroethylene resin (PVDF). Conventional solvent coating system    -- polyester resin (PE): regular polyester resin topcoat (PE) is a conventional topcoat system, which is not affected by fatty acid and has superior performance in characteristics. The coating has good flexibility, adhesion and processability. However, the resistance to sunlight and film pulverization of PE coating are not ideal. The use of PE coating still needs to be restricted. It is generally used in areas with less serious air pollution. In industrial environment or areas with serious pollution, its service life is relatively reduced. Generally, it has a service life of eight to ten years. At present, the color coated plates, including Baotou steel plate, WISCO steel plate and most of Baodao and Korean imported plates, are all PE coated. A better solvent coating system -- strengthened silicified polyester resin (SMP): strengthened silicified polyester resin topcoat (SMP) is improved from polyester resin (PE). Because PE contains active group - OH / - COOH, it is easy to react with other macromolecular compounds. In order to improve the resistance to sunlight and pulverization of PE, it is denatured with silicone resin which has good color retention and heat resistance, and the synthesis of reinforced silicified polyester resin (SMP) can provide better performance and outdoor weather resistance of steel plate, It can also prolong the anti-corrosion life. SMP treeUnder the condition of outdoor conventional climate and proper rainfall, the grease coating system can avoid cracking, peeling or loosening of the coating within 10 to 15 years. Polyvinylidene fluoride (PVDF): polyvinylidene fluoride (PVDF or PVF2) is the solvent coating system of Baosteel az150 aluminum zinc coated coil. It is one of the solvent coating systems in the world, and is also an intermediate product of color coating for construction industry. Due to the strong bonding force between PVDF chemical bond and chemical bond, the coating has very good corrosion resistance and color retention, and its weatherability (gloss retention, pulverization resistance and color durability) is also outstanding among all coating systems. PVDF has large molecular weight and straight bond structure, so in addition to better chemical resistance, it also has better mechanical properties, UV resistance and heat resistance. The polydifluoroethylene resin coating system is called Kynar 500 in the United States and xSe in Australia. The polydifluoroethylene resin coating system will not crack, peel or loosen in 30 to 35 years under the condition of outdoor conventional climate and proper rainfall. Due to inventory and market fluctuations, detailed resources, price is subject to cable discussion, welcome to inquire! Baosteel az150 aluminum zinc coated coil
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