A number of mandatory national standards will be implemented soon, and the waterborne polyurethane material will usher in the east wind

On November 13, the Ministry of industry and information technology issued 8 compulsory national standards for the chemical industry, including the limit of harmful substances in wood coatings, for approval and publicity The new national standard will put forward higher requirements for VOCs emission of polyurethane coatings, adhesives and other industries On November 13-15, the fifth water-based polyurethane scientific research and technology exchange conference hosted by China Polyurethane Industry Association, organized by water-based materials special committee and Oskar materials technology (Shanghai) Co., Ltd., experts in the industry believed that with the continuous improvement of environmental protection requirements such as VOC emission, the water-based polyurethane will usher in the east wind Professor of Anhui University said that at present, the proportion of waterborne polyurethane in polyurethane industry in China is very small In 2018, the output of polyurethane in China is about 11 million tons (equivalent to pure solid content), and the output of waterborne polyurethane is about 100000 tons, including 30000 tons of pure solid content However, waterborne polyurethane is a very important product In recent years, due to the improvement of environmental protection requirements and awareness, China's waterborne polyurethane industry has developed rapidly, with the growth rate far exceeding the overall polyurethane industry From the initial leather coating to textile coating, synthetic leather slurry, wood coating, industrial coating, automobile coating, polyurethane condom, the application field of waterborne polyurethane has been expanding and the technical level has been continuously improving Strict environmental supervision has opened up a new development space for waterborne polyurethane materials Shasha, project director of VOCs of environmental engineering assessment center of Ministry of environmental protection, said that in order to implement the notice of the State Council on printing and distributing the three-year action plan to win the blue sky defense war, the comprehensive treatment plan for VOCs in key industries issued by the Ministry of ecological environment in July this year clearly proposed to strengthen the comprehensive treatment of VOCs in industrial coating It is necessary to strengthen the source control and accelerate the use of water-based coatings with low VOCs content instead of solvent based coatings, including coatings for automobile manufacturing, steel containers, wooden furniture, engineering machinery, electronic products manufacturing, and water-based adhesives for soft furniture                               in the announcement of 8 compulsory national standards for chemical industry "These mandatory standards are not far from being formally implemented These measures are also intended to further limit VOCs emissions in the chemical industry, and will also bring new development opportunities to polyurethane waterborne materials " Han Baole, Deputy Secretary General of China Polyurethane Industry Association, said At present, there are many kinds of waterborne polyurethane products, including adhesives, coatings and leather resins With the introduction of mandatory standards, a number of enterprises will face transformation and upgrading Taking coating enterprises as an example, it is estimated that 70% - 80% of the enterprises can meet the new national standard to be implemented, and 20% - 30% of the enterprises are not up to the standard, so they must meet the policy requirements through environmental protection upgrading such as water-based However, the development of waterborne polyurethane also faces some technical problems to be solved According to the opinion of vice president of China Polyurethane Industry Association, director of water property special committee and chairman of oskar materials technology (Shanghai) Co., Ltd., solvent is still used in most of the production processes of water-based polyurethane dispersion, resulting in the problem of solvent recycling How to reduce the amount of organic solvent and realize the green production without solvent through the research and development of new synthesis process and raw materials is an important research topic in the development of waterborne polyurethane materials In the synthesis process of waterborne polyurethane, solvent is used to help dissolve reactants, reduce the viscosity of prepolymer and help dispersion The synthesis of waterborne polyurethane requires high performance of solvent The solvent must be inert and miscible with water It has good dissolving ability for reactants and products, and its boiling point should be within a certain range At present, acetone and other solvents are needed in the synthesis of waterborne polyurethane, which are inflammable and explosive dangerous goods, and are limited in the process of production and transportation, so it is urgent to develop new non-toxic and safe solvents " Professor of Anhui University explained Professor of Anhui University also pointed out that although the VOC emission of waterborne polyurethane in the application process is low, it often produces more waste gas and waste residue in the synthesis and use process than solvent products How to reduce the discharge of "three wastes" is also an important issue in front of the waterborne polyurethane industry Among the four water-based resins, epoxy, acrylic, alkyd and polyurethane, polyurethane has some advantages in performance, but its application proportion is still low "In fact, China's waterborne polyurethane materials have been studied for a long time, and there are many good technologies At present, the main problem is the lack of high-end raw materials For example, the high-end curing agent, special polyol, aliphatic isocyanate and other raw materials required for water-based materials, due to the high technical threshold, many of them are foreign patented technologies, which restrict the development of the industry We have a large market for downstream applications, so we have a rapid development, but at present, we lack of Chinese brands Most of our polyurethane brands are upstream " According to the professor of Anhui University, in order to improve the development level of waterborne polyurethane industry, it is necessary to develop both upstream and downstream                         Vice president of China Polyurethane Industry Association, director of water property special committee and chairman of oskar materials technology (Shanghai) Co., Ltd He hoped that the waterborne special committee of polyurethane association could build a high-quality communication platform from material research and development to user use, and promote the healthy development of waterborne polyurethane industry                           Crestron can provide a variety of solutions such as high-performance polyurethane water-based shoe adhesive, water-based PP primer, etc In terms of raw materials, the new isocyanate monomer XDI / h6xdi developed by Wanhua has higher reaction activity, and its unique molecular structure can give water-based resin better mechanical properties and heat resistance.