• Categories: Industry News
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• Time Of Issue: 2019-12-13 19:57
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(Summary description) In 2014, the total output of coatings in China reached 16.4918 million tons. Such a huge production of coatings, leads to not only nonnegligible environment pollution and energy consumption, but also millions of tons of VOC emissions to the atmosphere. Reducing the pressure of production and painting process on environment and energy should be a key task of the 13th five year plan. At present, the growth rate of low pollution coatings in China is far lower than that of the total output of coatings in China. In recent years, the proportion of water-based architectural coatings has increased significantly, while the proportion of low pollution coatings is still negative. The promotion of low-carbon environmental protection, energy conservation and emission reduction can not be separated from the development of coating technology. During the 13th Five Year Plan period, we should encourage and support environment-friendly and resource-saving coatings such as water-based coatings, high solid coatings, solvent-free coatings, light curing coatings, radiation curing, functional new exterior wall external insulation coatings, as well as products and production lines with single line capacity of 30000 tons / year and above. In the process of R & D, production and application of various coatings, many problems have been encountered at this stage, which need to be solved during the 13th Five Year Plan period. For example, the binding water in the drying film-forming process of waterborne wood coatings is not easy to be discharged, which eventually leads to the phenomenon of water absorption of wood, such as burst reinforcement. In the later stage, the technology of cold infrared drying and microwave drying should be popularized to promote the discharge of combined water. China's automotive coating technology has reached or even surpassed the international advanced level, but the main production line that has been put into operation is the solvent based coating production line with medium and low solid content. If all the production lines are changed to water-based production line, it is impractical either for capital investment or for the production line to stop production and sales. In the later stage, the production line can be upgraded and constructed at the same time. On the one hand, the investment in the field of paint utilization rate and paint mist recovery technology will be increased, and the production line of medium and low solid coatings will be improved to high solid coatings. On the other hand, the water-based coating line will be built in parallel without affecting the production, so that the water-based coating line will gradually replace the solvent based coating line. The ship coating construction is mainly spraying, and a small amount of precoating is brush coating process. Due to the huge volume of the hull, the segmented painting process is generally adopted, and finally the hull is closed, which can achieve 80% ~ 95% of the paint completely closed spray construction. However, the painting operation after the whole ship is closed is basically completely open, so the emission reduction must be realized by controlling the VOC content and diluent dosage of the coating. At present, there are some problems in steel structure coating and coating, such as the unorganized VOC emission caused by open-air coating, the high VOC content and diluent proportion caused by solvent based anti-corrosion coating, and the steel needs regular coating maintenance, which lead to a large amount of VOC emission in steel structure coating itself and the coating process During the 13th Five Year Plan period, low VOC coating should be used as far as possible, environmental protection construction method should be promoted, anti-corrosion quality of coating should be improved, and maintenance times of coating should be reduced. In general, the coating industry must promote industrial upgrading through technology upgrading, gradually develop from high pollution and high energy consumption to low-carbon environmental protection, increase investment in research and development of green environmental protection coating technology, improve and upgrade the coating production line that can not be eliminated temporarily, realize VOC organized emission, and improve the coating process to increase the coating utilization rate, Reduce the waste of paint mist and VOC emission.