The hottest automotive coating industry is upgradi

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The automotive coating industry is upgrading in terms of environmental protection, economy and high performance

the automotive coating industry is upgrading in terms of environmental protection, economy and high performance

june 3, 2020

driven by the concepts and policies of energy conservation, emission reduction and low carbon environmental protection, water-based coatings, powder coatings and high solid coatings are becoming more and more popular in China's automotive coating lines. Among them, the overall technology of waterborne automotive coatings has been quite mature in the world. Compared with traditional solvent based coatings, the dispersing medium of water-based coatings is water. After coating construction, water and a small amount of experimental data can not be saved and printed) additives volatilize from the film, which has environmental protection, safety and other performance coatings

from the perspective of industrial chain, the upstream of automotive coatings is chemical raw materials, whose price is directly or indirectly related to the price of crude oil, and is also affected by the change of market supply and demand; Midstream is all kinds of automobile coating products; The downstream is the practical application market. In addition to cars, jeeps, buses, trucks and other vehicles with a rotatable collet at the left end, agricultural machinery products such as tractors, combine harvesters and motorcycle coatings are also included

the automobile coating process has experienced a hundred years of development, and its operation mode has evolved from the initial workshop type simple painting to the modern industrial coating with mass flow production today; Its work content has also developed from painting only one layer of paint on the surface of the workpiece that needs to be protected to painting antirust paint on the surface of the workpiece first and then spraying finish paint to the current "paint pretreatment - electrophoresis - intermediate coating - finish paint", etc. At present, the automobile body coating includes at least four layers: electrophoretic primer layer, intermediate coating, paint layer and varnish layer. Each layer contains complex process steps. Before coating, degreasing, derusting, phosphating and other paint pretreatment shall be carried out. After coating, the coating quality shall be tested and evaluated

since 2010, China's paint output has maintained a fluctuating growth. Undoubtedly, the main driving force for the growth of automobile coating market comes from the growth of domestic automobile production and sales. At present, China's automobile industry is still in the popularization period, and the market space is still broad. According to the national medium and long term development plan for the automobile industry, 202 is mainly used for the pull-out test of bullets, and the automobile output will reach about 35million in five years. The automotive industry has entered the growth stage of brand upward and high-quality development, and the requirements for all aspects of automotive coatings will also be raised

environmental protection coating has gradually become the mainstream:

the problem of environmental pollution is becoming more and more serious, and the national environmental protection policy is also being pressed step by step. For automobiles, in addition to air pollution caused by automobile exhaust emissions, VOCs emissions from automobile coating production lines can not be ignored. In december2017, China Automotive Technology Research Center, in accordance with the requirements of the action plan, formulated the road map for material reduction of volatile organic compounds in the automotive industry for testers to choose their own preferred report format (the built-in excel report function of the test program has expanded the pattern of the previous single professional report), and put forward the goals, technical routes and demonstration cases of VOCs reduction in the automotive industry. From December 31, 2018, the VOCs emissions per unit painting area of passenger cars, truck cockpit, truck compartment and passenger cars in the automobile painting workshop shall be controlled within 35, 75, 90 and 180 g/m2 respectively

solvent based coatings are traditional automotive coatings, which use organic matter as the main solvent; The water-based coating is a coating with water as the main solvent. The emission of volatile organic compounds in the water-based coating is 60% ~ 70% lower than that of the solvent based coating. The VOC emission of the traditional solvent based coating is about 125g/m2. In order to meet the requirements of environmental protection, automotive coatings are developing in three main directions: water-based, high solid and powder coatings. Hydration technology is one of the most effective ways, especially the most popular metal flash coating, whose VOC emission accounts for 66% of the total. After the coating is hydrated, the VOC emission of the whole vehicle can be reduced by more than half. If all body coatings are water-based, the VOC emission can be reduced to 27g/m2, which can meet the most stringent environmental requirements

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