“The Ministry of Environmental Protection began investigating VOC (volatile organic compound) emission sources in late April and solicited relevant opinions, and the VOC emissions will be gradually restricted during the “Twelfth Five-Year Plan†period. The paint coating industry urgently needs to reduce the amount of solvent used, with a low Toxic solvents replace toxic and hazardous solvents." The 14th National Coatings Technology Information Exchange Conference and Traffic Coatings Coating Technology Seminar Held on May 25-27 in Xi'an, Professor Liu Guojie, Department of Industrial Development, China Coatings Industry Association That is to say.
It is understood that China currently discharges 18 million tons of VOC annually, of which paint coating industry accounts for 1/4 of the total VOC emissions. VOCs combine with nitrogen oxides under sunlight to form toxic photochemical smog and pollute the atmosphere. In 1966, the United States announced the world’s first “Regulation 66†on the control of solvent-polluted air, which stipulated that the solvent content in paints should not exceed 17%. In 2002, the European Union enacted the Regulation on Emission of Solvents and Restricted Emissions, which required reduction of solvents by 2010. 50% of emissions; China's environmental priority to control 68 kinds of harmful toxic substances in the black list, including paint solvents and raw materials. These indicate that the development of coating products in the direction of low VOC and low pollution has become an inevitable trend.
"But solvent is an important raw material for coatings, and it will not be replaced completely in a long time. Therefore, it is necessary to avoid damage, use rationally, and regulate development." Liu Guojie said that the development of high solids, solvent-free, water-based, powder, etc. Coatings, using low-toxicity solvents instead of toxic and hazardous solvents, gradually reducing the amount of solvent is the paint coating industry's development direction. Currently, DBE solvents (mixtures of dimethyl succinate, dimethyl glutarate, and dimethyl adipate), DMC (dimethyl carbonate), sec-butyl acetate, and other low-toxic solvents have been widely used. We should advocate the use of biological solvents, such as the extraction of citrus juice and other plant sap, does not contain any toxic and harmful substances, can be used as oil-based paint solvents, synthetic resin paint thinners; domestic and foreign are recommended lactic acid esters, replace some toxic and harmful Solvents.
From July 1, 2002, China has already begun to implement the national standard “Restriction of Harmful Substances in Interior Decoration Materials Interior Wall Coatingsâ€, which stipulates that interior wall paint VOC should be less than or equal to 200 g/L. If it is to obtain the green environmental protection mark, VOC The content should be less than 100 g/l. For industrial coatings in the automotive, road, and manufacturing industries, VOC emissions are of relatively low concern.
As a high-end technology field in the coatings industry, automotive coatings and coating processes are the most energy-intensive and VOC-displacement links in automotive manufacturing. The "Limits for Harmful Substances in Automotive Coatings", which was implemented on June 1, 2010, stipulates tolerances for human and environmental hazardous substances in passenger cars, commercial vehicles, trailers, original paints for automotive trains, repair paints, and parts and coatings. Limited and so on. In the face of increasing environmental protection requirements, automotive waterborne coatings are playing an increasingly important role.
Liu Xianwen, technical director of Shaanxi Baotashan Paint Co., Ltd., said that waterborne coatings, powder coatings and high solids coatings will gradually replace traditional solvent-based intermediate coatings and topcoats, becoming the mainstream of modern environmentally-friendly automotive coatings. At present, the domestic auto paint production capacity is about 500,000 tons, but the high-end auto paint market is divided by joint ventures or wholly-owned enterprises of international giants such as PPG, BASF, Dupont, Kansai, etc., and joint venture brand cars such as Japan, the United States, and Germany are used in nearly 9 Chengdu. Automotive waterborne coatings, China automotive coatings can only occupy a small share in the low-end market such as auto parts and trucks. Liu Xianwen believes that while paint manufacturers are introducing and innovating automotive waterborne coating technology, they should boldly cooperate with automobile manufacturers to enter the automotive coatings industrialization experiment and accelerate the promotion of waterborne coatings.
"In addition to the high price of water-based paint products, but also very 'squeamish', in the production, transportation, storage and coating temperature must be controlled below 30 °C, poor adaptability to the environment, water resistance and corrosion resistance less than solvent The performance of the paint should be improved under low temperature and humidity conditions.†Huang Liwen, assistant director of the basic technology section of the Research Department of Hunan Xiangjiang Guanxi Paint Co., Ltd., a multinational corporation established by the Kansai Group in Japan, told reporters.
At the National Coatings Painting Technology Information Exchange Conference and the Traffic Coatings Coating Technology Seminar, it was learned that in recent years, domestic paint development has increasingly focused on environmental performance. Institute of Marine Chemical Industry and Qingdao Tiehai Fine Chemical Industry Co., Ltd. cooperated in waterborne anti-corrosion coatings and matching putty projects for railway vehicles and passed the technical appraisal; Shijiazhuang Paint Factory and Zhuzhou Vehicle Paint Factory successfully developed waterborne coatings for railway vehicles; Hunan Bangshi The waterborne coatings for automotive engines developed by Coating Technology Co., Ltd. use water-borne polyurethane one-component resins as paint resins. The coating performance and appearance can meet the requirements for engine painting.
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