Paint: Focus on reducing VOC

China Coatings Network
: In 2014, China'
total
total production of coatings reached 16.4918 million tons. Behind such a huge output lies significant environmental pollution and energy consumption, and paint products of this base emit millions of tons of VOCs into the atmosphere during the coating process. Reducing the pressure on the environment and energy caused by the production and coating process should be a key task of the "13th Five-Year Plan" of the coating industry.
At present, China's low-polluting paint growth rate is much lower than the growth rate of the country's total paint production, in recent years only water-based
bicoal coatings
accounted for a considerable proportion of the growth rate, the overall proportion of low-polluting paint is still negative growth.
low-carbon environmental protection, energy conservation and emission reduction work can not be separated from the development of paint technology. During the 13th Five-Year Plan period,
water-based coatings
, high solid sub-coatings, solvent-free coatings, photo-curing coatings, radiation curing, functional new external insulation coatings and other environmentally friendly, resource-saving coatings, as well as single-line production capacity of 30,000 tons / year and above products and production lines. In the process of research and development, production and application of various types of coatings, many problems have been encountered at this stage and need to be solved during the 13th Five-Year Plan period. For example,
water-based wood coating
the combination of water in the process of drying into film is not easy to discharge, resulting in wood absorption of the phenomenon of burst ribs. Late water-based
wood coating
should promote cold infrared drying, microwave drying and other technologies to promote the discharge of combined water.
National coating
s
technology has reached or exceeded the international advanced level, but has been put into operation mainly for low- and medium-level solid solvent-based coating production lines, if all changed to water-based production lines, whether it is capital investment or let the production line stop production is not practical. Later can be synchronized production line upgrade and production line construction, on the one hand, in the field of coating uity, paint fog recovery technology to increase investment, low- and medium-low solid sub-paint production line to improve into a high solid sub-paint production line, on the other hand, without affecting the production of the same
, parallel construction of water-based coating lines, so that water-based coating line phase gradually replace solvent-based coating lines.
ship paint
coating construction to spray-based, a small number of pre-painting using brush coating process. Due to the huge size of the hull, the general use of segmented coating process, and finally closed, can achieve 80% to 95%
painting
of the complete closed spray construction. However, the coating operation after the whole ship is closed is basically completely open air, so it is necessary to reduce emissions by controlling the VOC content and thinner dosage of the coating.
steel structure coating and coating currently exist in the open-air coating led to VOC tissueless emissions,
septhinkable coating
mainly solvent-based resulting in HIGH VOC content and thinner ratio, steel needs to be regularly applied maintenance and other issues, resulting in the steel structure coating itself and the coating process will produce a large number of VOC emissions. "13th Five-Year Plan" period anti-corrosion coating should try to use low VOC paint, promote environmental protection construction methods, and improve the quality of anti-corrosion coating, reduce the number of coating maintenance.
Overall, the coating industry must promote industrial upgrading through technological upgrading, from high pollution, high energy consumption to low-carbon environmental protection direction, increase investment in green paint technology research and development, can not be eliminated from the coating production line to improve and upgrade, to achieve VOC organized emissions, and paint coating process to improve, increase paint uity, reduce paint waste and VOC emissions.
, Deputy Secretary-General of the China Coatings Industry Strategic Alliance for Technological Innovation