The hottest policy spring breeze blows water-based

2022-09-19
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Policy spring breeze blows water-based coatings to speed up technological upgrading

policy spring breeze blows water-based coatings to speed up technological upgrading

June 23, 2014

[China coatings information] "Water based wood coatings have made great progress after development in recent years. The output has grown from scratch, the technology has changed from coarse to fine, and the varieties have changed from single to diversified. Various supporting resins, additives, colorants, coating equipment, baking facilities, etc. are constantly improving." At the 8th China International waterborne wood coatings development seminar held recently, sun Lianying, President of China Coatings Industry Association, revealed that in the past 20 years, the number of manufacturers of waterborne wood coatings has increased from to nearly 100. In 2013, the sales of waterborne wood coatings was close to 2billion yuan, and the sales of individual enterprises was close to 100million yuan

in recent years, haze weather has frequently invaded North China, South China and some other regions of China. The content of PM2.5 in the atmosphere and volatile organic compounds (VOC) emissions have become the most concerned topics. In this case, water-based coatings have attracted more and more attention because of their advantages of energy conservation, environmental protection, health and safety, non combustion and non explosion, and very little VOC emission. Experts predict that, stimulated by the favorable national policies, the hydration rate of civil coatings will reach 80% and that of industrial coatings will reach 15% in the next five years

policies support the development of water-based coating industry

the coating industry is an important chemical industry in China, which is related to the development of the national economy. However, traditional coating products have made a great contribution to VOC in the process of use. The water-based coating takes polymer resin as the base material and water as the solvent, which can effectively reduce VOC emission and environmental pollution. It is green, safe and convenient. At present, the situation of air pollution in China is relatively serious, especially in the past two years, there has been continuous haze in many places in the country, and the regional atmospheric environmental problems with PM2.5 and VOC as the main pollutants are becoming increasingly prominent. These problems have caused the country to attach great importance to the control of air pollution, and also prompted the country to increase (1) efforts to wipe equipment before the experiment to promote the development of water-based coating industry

in February, 2013, the revised version of the catalogue for the guidance of industrial restructuring (2011 version) was released. The production of environmentally friendly and resource-saving coatings such as water-based wood, industrial and marine coatings, high solid content, solvent-free, radiation curing, and functional exterior wall external insulation coatings was included in the encouraged category. At the same time, the catalogue also takes water-based coatings as environmental protection application materials in the automotive industry

in September, 2013, the State Council issued the action plan for the prevention and control of air pollution, which made it clear to strengthen comprehensive treatment, reduce multi pollutant emissions, and promote the treatment of volatile organic compounds pollution. We will implement the comprehensive treatment of volatile organic compounds in the petrochemical organic chemistry, coating, packaging and printing industries, improve the limit standards for volatile organic compounds in coatings and other products, promote the use of water-based coatings, and encourage the production, sale and use of low toxic and low volatile organic solvents

at the same time, Beijing, Guangdong and other places have also introduced clean air action plans. Among them, Beijing included "volatile organic compounds" into the emission reduction control object for the first time in the clean air action in 2013. It is stipulated that for new furniture and electronic industry coating projects, the proportion of low volatile organic compounds such as water-based coatings in the total amount of coatings used shall not be less than 50%

in addition, sun Lianying revealed that the state plans to control VOC by levying consumption tax, involving many chemical fields, including traditional coatings. At the same time, the national catalogue of guidelines for industrial structure adjustment is about to start a new round of revision. According to the requirements of the national development and Reform Commission, the China Coatings Industry Association will refine the content of solvent based coatings as a restricted category, consider defining the restricted category through the VOC limit of solvent based coatings, determine the definition scope of high solid coatings, and further encourage the development of water-based coatings

enterprises speed up technological upgrading

water based coatings can be applied to architectural coatings, industrial coatings and special coatings, with broad application prospects. However, according to Zhou Xianhui, Deputy Secretary General of the China Federation of petroleum and chemical industries, water-based coatings have entered the Chinese market for nearly 20 years. The industry has worked hard to promote its industrialization, but its market application rate has always been low. She said that among wood coatings, water-based coatings accounted for only about 5%

Lian Shibin, the R & D director of Huizhou mayor Runfa Coatings Co., Ltd., explained the reasons for the difficulty in promoting water-based coatings: first, in product development, the water-based coatings film has poor water resistance, fullness and heat resistance, and low gloss and hardness. Secondly, during the construction process, water-based coatings are prone to bubbles and wrinkles, which requires investment in drying and low humidity baking line equipment, and the drying speed is affected by temperature, humidity, air flow speed and paint film thickness, so the construction is very difficult. Third, in the process of industrial production, to ensure the stability of performance of water-based coatings, it needs the cooperation of highly standardized industrial equipment, and the freezing point of water-based coatings is high. In winter, if placed in a low temperature environment, the performance of water-based coatings will deteriorate

it is reported that in order to overcome the bottleneck in the promotion of water-based coatings, Huizhou mayor Runfa Coatings Co., Ltd. has continuously increased its research and development efforts in recent years and developed a number of production processes and new products. Hebei Chenyang industry and Trade Group Co., Ltd. also signed a strategic cooperation agreement with the Institute of process engineering of the Chinese Academy of sciences last year. The two sides set up a "Joint Laboratory of nano functional materials" with the "nano composite water-based coatings" as the starting point of cooperation, so as to promote the water-based coatings to move towards the direction of high, precision and cutting-edge

in addition, at present, a large number of water-based coating production enterprises, including Jiabaoli Chemical Group Co., Ltd., sankeshu coating Co., Ltd. and Dibang Coating Industry Co., Ltd., are actively cooperating with universities and scientific research institutes to improve their technological level

while improving the technical level of enterprises, Jiang Jian, director of zhanchen paint furniture paint center, believes that many downstream application enterprises of water-based paint may need not only water-based paint, but the whole environmental protection coating solution. Therefore, water-based coating enterprises should also work hard in this regard

Zhu Xiang, an analyst at Wanbo Industrial Research Institute, said that the prevention and control of industrial pollution is the voice in the process of industrial development. Therefore, the development of more environmentally friendly water-based coatings is the general trend. According to the data of Wanbo Industrial Research Institute, the sales revenue of the water-based coating market in the Asia Pacific region will increase from US $11.9 billion to US $16.7 billion in, with an average annual growth rate of 8.9%. The development of the water-based coating industry will enter a high growth period. Among them, China will become the main force in the development of water-based coatings market in the Asia Pacific region

the problem of recycling needs to be solved

talking about the problems that the traditional chemical metallurgy of water-based coating is prone to produce waste gas and waste residue pollutants, which should be paid attention to in the use process. Lian Shibin said that the waste liquid of water-based coatings must be professionally recycled. "This is a very difficult problem that enterprises need to face."

"the coating efficiency of water-based coatings is similar to that of solvent based coatings, and the coating efficiency is not ideal. Generally, the coating efficiency of water-based Wood Coatings in the spraying process is 20%-40%, and the highest coating efficiency using air mixing method or other methods will not exceed 55%." Gao Yuan, chief engineer of Zhejiang Yuanbang Material Technology Co., Ltd., said that this brings a problem. According to the coating efficiency, there are tens of thousands of tons of waste liquid and tens of thousands of tons of waste slag in China every year, which is very serious to the environment, and the current treatment methods are relatively limited. "Waterborne wood coatings contain polymers, polymer dispersions, and various solvents, and the solvent composition is relatively complex. It is difficult to collect these substances into the drainage system. From this point of view, its harm is much higher than solvent based coatings."

if these water-based paint waste liquid can be effectively recycled, it can be turned into treasure. Gaoyuan said that Zhejiang Yuanbang Material Technology Co., Ltd. recycles the waste liquid of water-based coatings on site, and then extracts the waste paint residue from the waste liquid as an organic material for modification treatment, and the utilization rate can reach 95%-99%

in addition to professional recycling of waste liquid, Xia Yuanyuan, director of Microbiology Laboratory of technical service center of Hoffman (Tianjin) International Trade Co., Ltd., said that attention should also be paid to microbial prevention and control during the use of water-based coatings

with the concept of environmental protection deeply rooted in the hearts of the people, coating manufacturers are forced by the environmental requirements of consumers for coatings, and use a large number of water-based development formulas to replace the original formula. However, according to Xia Yuanyuan, this type of coating uses water as a diluent, which provides conditions for individual microbial reproduction, and the organic matter of water-based formula provides nutrients for microbial growth. These aquatic products are more vulnerable to microbial invasion in the process of production, storage and transportation. Microbial absorption life imitates the acceptance test, uses nutrients, discharges metabolites, and causes the product to rise. Microbial metabolism uses some substances such as decomposition emulsifiers, so as to change the stable system of products and make products layered. In the process of metabolism, some microorganisms will secrete pigments that depend on the shape of the rigid body, the mass dispersion and the position of the rotating axis, resulting in the change of product color

therefore, a certain amount of preservatives are generally added in the production process of water-based coatings to inhibit microbial reproduction. "But this is not enough to let us rest easy. We should also establish a microbial management system, from formula setting to quality accident diagnosis, and then to daily microbial quality management. We should establish a complete set of systems, from environmental control to the selection and use of formula products to achieve good microbial monitoring." Xia Yuanyuan said

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