The integration of coating and coating is of significance to the development

The future development trend of coating industry is the integration of coating products and coating lines. At present, despite the rapid development of China's coating industry, however, the imbalance between the development of coating and coating integration is gradually reflected, mainly reflected in the relatively backward coating. There is a popular saying in the industry that "three paint and seven construction", which fully reflects the importance of coating. Only through coating can the coating be applied in practice, can it show colorful characteristics, as well as antifouling, mildew, corrosion and other functions. The market call for the integration of coating and coating is getting higher and higher. In the development of coating industry, it is also necessary to pay attention to the matching of coating, so as to achieve win-win cooperation between upstream and downstream enterprises. Although China's coating industry started late, it has developed rapidly.

In the tide of low-carbon and environmental protection economic development, the coating industry is developing towards water-based, and various innovative scientific research products are constantly launched. However, many factors lead to the inconsistent development pace of coating and coating, and the coating technology and level relatively lag behind the development of coating, which largely restricts the development of coating industry. The standard of waste residue and waste water treatment of water-based paint with limited use environment is not very smooth in the development of water-based paint at home and abroad, with a history of more than 20 years, which is far from the development history of oil-based paint. From the current promotion of waterborne coatings, waterborne coatings are in a state of disordered competition, one-stop promotion of waterborne coatings does not meet the needs of the market. There is no relevant system for the treatment of water-based paint slag and cleaning water.

The existing elimination and identification are not a concept of dangerous goods. The detailed rules should be reflected by the identification of local environmental protection department. The VOC content of water-based paint must be controlled below the national standard. The VOC content of water-based paint can be less than 50g or even lower. The cost of waterborne coatings is higher. On the one hand, the raw material cost of waterborne coatings is higher. On the other hand, spectral analysis of various components, heavy metals, etc. are also the difficulties in the promotion of waterborne coatings. From the research and development to the practical application, if the real water-based coating achieves the same performance as the oil-based paint, the cost will be higher than the existing oil-based paint products.

The integration of coating and coating improves the utilization rate of waterborne coatings in the field of freight cars. According to CRRC, by the end of 2019, all enterprises of freight cars will promote the use of waterborne paints in an all-round way. By the end of 2020, all enterprises of locomotive products will promote the use of waterborne paints in an all-round way. All enterprises of passenger cars and urban rail and metro cars will promote the use of waterborne paints in an all-round way. All enterprises of accessories will promote the use of waterborne paints in an all-round way Water based paint is widely used. Because there are many branches of CRRC group, each factory has different environment, the production line must be reformed, and there must be baking conditions, temperature and humidity control, wind speed and other issues to reflect the performance of water-based coating. In the process of construction, it is difficult to solve the problem of high humidity and sagging in the South without baking conditions.

For water-based paint, thick coating is difficult. The film thickness required by onshore wind power is 240um inside and 280um outside; the film thickness of offshore wind power is 280um inside and 320um outside, which is really difficult for water-based coating. If the thick coating is forced, the dry film thickness is relatively high, and there must be multiple coating processes, and the solid content of the coating is required to increase, but the high solid content of the water-based paint is difficult, the solid content of the primer and intermediate paint can meet the requirements, the solid content of the top coat can now reach 50%, it is difficult to exceed 60%, and the solid content of 50% can be applied with a dry film thickness of about 20-30um, if the requirement of the top coat is 120um, at least 3-4 Dao, not only the cost of coating products is high, but also the labor cost in the construction process is high. The performance and equipment of water-based coatings are upgraded together to promote the industrial development of water-based coating products. The support of raw material enterprises is needed to improve the scratch resistance and hardness of water-based coating film by improving the performance of raw materials. The spraying equipment of water-based coating also needs to be upgraded, such as electrostatic spraying, solvent-free spraying, etc., which can greatly improve the utilization rate of coating.