From: China Daily paint
        State of volatile organic compounds (VOCs) control more and more attention, the paint industry ushered in the green transformation opportunity. To achieve green manufacturing in the paint industry, not only to achieve raw materials and green products, focusing on the production process of "three wastes" emissions, but also reduce the construction aspects of environmental pollution. Therefore, from the cradle to cradle (an industrial closed loop mode during the initial design stage to take the issue to the product, so that part of the product can be recovered and put to use again, in order to maximize the concept of sustainable development), to achieve full life cycle of green, the paint industry is the key to achieve green manufacturing.
        Efficient use of raw materials
       "Made in China 2025" Plan proposed to improve the efficiency of resource use, and strive to build efficient, clean, low-carbon, recycling, green manufacturing system, promote the use of resources to a green low-carbon transition. "Efficient means of raw materials into the final can be converted into downstream products. The entire production process 'waste' as possible emissions, energy consumption and costs as little as possible." From the beginning of the 1990s engaged in the development and production of water-based paint Hebei Chen Yang Industrial Group Co., Ltd. Deputy General Manager of the East tied understood.
        East bolt said, before a larger amount of oil paint in 60% to 80% solvent paint film formation process, most will evaporate into the atmosphere, the use of the material is neither efficient nor green. Many paint companies eyes turned to the aqueous coating, UV-curable coatings, powder coatings and other green paint.
        Yang Huan Wanhua Chemical Group Co., Ltd. marketing services manager believes that to achieve the full life cycle of the green, resin that is required from the viewpoint of the source: in terms of traditional acrylic acid (PA) system, hardness and low VOCs contradictory, if hope the film hardness, we need to add more additives containing VOCs. In the hope to improve the mechanical performance of the premise, as far as possible to reduce the content of VOCs. Our idea is that, in addition to further optimize the PA system, the use of urethane acrylate (PUA), water-based UV and other routes. If you need to add 6% PA coalescent words, PUA2% is enough, you do not need to add any water-based UV film-forming additives, can be highly crosslinked.
"At present, the industry is still advocate the use of non-fossil energy sources, the production of raw materials from nature, paint, coating the end and return to nature. That is the whole life cycle does not pollute the environment, leaving no footprints, such as mineral coatings, bio-based coatings. "East said bolt.
        Committee of Experts on China Coating Industry Association director Guitai Jiang also believes that the use of renewable raw materials is an important direction of the coatings industry green transformation. "For example, currently the more popular castor oil alkyd resin present alkyd paint is relatively mature, but most of the fossil raw materials to produce, how to use today's technology, upgrading of traditional products, and expand the application field is the future needs considerate."
        Production reduction "three wastes"
        Industry experts pointed out that the major air pollutants from the use of paint solvents. Coating film-forming substance, it may involve alkyd / polyester resins, phenolic / amino resin, epoxy resin, acrylic resin, polyurethane, vinyl resins, cellulose resins, natural and synthetic rubber resins dozens; relates solvent alcohols, ethers, aliphatic hydrocarbons, ketones, terpenes, halogenated hydrocarbons, aromatic hydrocarbons, esters, such as hundreds of species. A wide range of air pollutants, lack of supervision is more serious. Most of the production equipment or intermittent production. Production process, are in extensive production from the main feeding areas, mixed deployment, packaging (standardization), tanks, and other aspects of the transfer.
        Therefore, the production process of "three wastes" emissions for green manufacturing coatings industry is also very crucial. In this regard, companies need to strengthen the source control, reduce solvent consumption. Priority use of non-toxic, low-reactive solvent gradually replace easily lead to foul-smelling solvent; precedence mosaic liquid seal, mechanical wedge seal, double seal seal seal, such as efficient manner within the floating roof tank; increased automation of operational links level, give priority barrel pump mode.
        Experts also suggested that companies strain fugitive emissions for organized emissions and improve the effectiveness of the end of the control technology. From the storage tanks, transfer, handling, feeding, production process and the "three wastes" treatment and other aspects of the whole process fugitive emissions control measures.
        It is understood that some of the industry's leading companies have achieved partly automated, continuous production, precise control of the production process, improve resource utilization, reduce the "three wastes" emissions played a positive role.
        Construction and environment-friendly
        As the saying goes, one-third paint, seven painting. Paint construction sectors are VOCs emitters, only green construction, coatings can be called from cradle to cradle.
        Professor of Chemical and Energy Engineering, South China University of Technology TU Wei-ping pointed out that some method of construction waste recycling difficult. For example, conventional spray efficiency vary greatly. Only 30% of low efficiency, and only 70% to 80% efficient. Therefore, there is a large amount of waste produced paint, plus cleaning equipment and containers also have paint waste, wasteful and polluting the environment. In addition to the use of environment-friendly paint, but also the need to strengthen the construction of part of the 'waste' recycling.
        Some coatings such as waterborne coatings, although the product itself is environmentally friendly, but the construction process if we do not pay attention to it will cause pollution. Guitai Jiang said: "Do not mention is environmentally friendly water-based, water-based applications still have some questions in the construction process, such as construction waste generated during cleaning brush tool wastewater directly into the sewer if the impact on the environment is also relatively large. there are some green paint, such as solvent-free coatings, powder coatings, UV-curable coatings are good things, how good is the key. "
        Therefore, the development of new technology and new methods for coating construction waste generated by recycling, reducing waste gas generation and to reduce waste water and exhaust gas solvent content, has become a hot research and problems to be solved.