Comparison of VOCs emission standard control requirements in the coating manufacturing industry at home and abroad

The solvents used in coatings cover alkanes, benzenes, terpenes, halogenated hydrocarbons, aldehydes, alcohols, ethers and esters, etc., and during the production and use of coatings, solvents are released into the environment due to volatility, becoming one of the important sources of volatile organic compounds (VOCs). At present, solvent-based coatings still account for a large proportion, so the production and use of voCs emissions have been concerned. Since 2017, China has put forward detailed requirements for the prevention and control of VOCs in industrial coatings
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. However, the definition of VOCs in China has not yet been unified. Therefore, VOCs control in the coatings industry is easy to present a one-size-fits-all situation. In order to promote the green development of the coating industry and reduce VOCs emissions from the coating industry, it is necessary to study the key volatile organic compounds in the coatings industry and screen for pollutants that are controlled as a priority. To provide the basis for government decision-making.Domestic and foreign paint manufacturing industry VOCs emission standards control requirements comparison the United States, the European Union is to carry out VOCs pollution control earlier countries, respectively, VOCs developed atmospheric pollutant emission standards, formed their own systems, and for the paint manufacturing industry have specific VOCs emission regulations. The United States has established new fixed-source emission standards for VOCs through which the coatings manufacturing industry sets emission limits and operating requirements for new and existing coating production operations. In 2010, the European Union issued the Industrial Emissions Directive, which includes and updates the 1999 VOCs Solvent Control Directive on Production Activities and Installations, setting out VOCs emission limits for 20 organic solvents in specific use units and activities, including organized, unorganised and total emissions.2017, Tianjin, Shanghai, Beijing, Hebei, Shaanxi, Fujian and other places have introduced emission standards related to the paint manufacturing industry. The state has also launched the national industry emission standards "paint, ink and adhesive industrial atmospheric pollutant emission standards", and has completed the consultation, pending release. The new standard system includes process control, emission limit, total amount control, etc.VOCs Control Indicator SystemCoatings and Similar Products VOCs Content LimitsSince the 2013 VOCs Pollution Prevention and Control Technology Policy, the State has adopted the "13th Five-Year Plan" Volatility Action Plan for Volatile Organics Reduction in Key Industries Organic pollution prevention and control work programme, etc. have put forward coatings, inks, adhesives and other VOCs as raw materials for the production industry, to encourage the production and sale of environmental mark products in line with the technical requirements of water-based, organic solvent-free, low-organic solvent-based coatings, inks and adhesives. But so far, only beijing-Tianjin-Hebei region jointly issued the building coatings and adhesive VOCs content limit standards, Jiangsu issued the paint products VOCs content limit standards for comments draft, Shenzhen issued SZJG54-2017 "low volatile organic matter content coating technical specifications." However, due to the wide variety of coating products and different functions, it is difficult to establish uniform VOCs content limits in law enforcement.the United States in the tape coating emission standard (SSS), polymer coating emission standard (VVV) on the substrate voCs content requirements, and put forward the corresponding analysis methods (method24). The EU Coatings Directive sets VOCs content limits for automotive coatings and building coatings from the source of the product and is used in conjunction with the Industrial Emissions Directive to achieve VOCs control of the coatings industry from source to end. China mainly through environmental mark product standards to limit the relevant paint products VOCs, and a few coating printing industry atmospheric pollutant emission standards also limit the VOCs content of ready-to-use inks.Coating Products ρ (VOCs) Limits vs
Depending on the use and type of coating products, the EU Coatings Directive and Hong Kong, China have developed detailed regulated coating products ρ (VOCs) limit standards, and China has also developed some coating products (such as building exterior coatings, solvent-based automotive coatings) in the toxic and harmful substances limit standards. Figure 4 compares the differences in the limits of voCs for building exterior coatings and solvent ρ-based automotive coatings in domestic and foreign product standards. As can be seen from Figure 4, the European Union has ρ (VOCs) limits for coating products.Domestic and foreign paint manufacturing industry VOCs emission standards system comparison
comprehensive U.S., European Union, China in the paint manufacturing industry VOCs emission standards of all links of the comparison, Table 8 with excellent, good, poor three-level standards to evaluate the emission standards of the control effect of VOCs in all links, with strict, loose secondary standards to evaluate the organization of emission standards limits of the leniency. On the whole, the paint manufacturing industry VOCs emission standards control effect order in order of the United States> The > China. China still needs to learn from foreign experience in source, process, indicator selection and total volume control to optimize the emission standard system controlled by voCs in the coatings manufacturing industry.the current VOCschina's paint industry and foreign developed countries still have a gap. Compared with developed countries abroad, although the composition of the standard system is consistent, but China in the source, process, indicator selection, total control and other aspects of integrity, refinement lag behind Europe and the United States, therefore, it is recommended that China in the paint industry VOCs emission standard system construction follow the whole process of prevention and control principles.In addition, emission standards control projects and their limit levels should be detected by technical or regulatory means, should have a unified standard monitoring and accounting methods to ensure the effectiveness and comparability of data, recommend the current national standard monitoring methods of the focus of volatile organic matter into the emission standards control projects and put forward limit requirements, the national standard monitoring methods have not yet been published for the key volatile organic matter temporarily using NMHC or TVOC indicators To control, pending the publication of the national standard test method and then listed as the control project recommended to set the requirements of VOCs emissions per unit of products, that is, the corresponding material content of the original auxiliary material towel to limit, promote the optimization of formulations and solvent replacement, the proposed emission standards using key volatile organic matter and volatile organic matter total index control, the use of material accounting and collaborative monitoring method to calculate VOCS escape rate and unit product VOCS emissions.