Current situation and future thinking of the hotte

Current situation and future thinking of water-based container coatings

current situation and future thinking of water-based container coatings

November 11, 2019

Introduction

due to its particularity, the ship and container industry pays more attention to the anti-corrosion coating. Containers are special tools for international logistics and transportation, and their use environment is complex and changeable, so the corrosion of their steel structures is inevitable. This puts forward requirements for the anti-corrosion performance of container coatings. On the premise of reaching the anti-corrosion standard, we advocate green and environmental protection. Therefore, this paper next discusses the more environmentally friendly coating water-based paint because NCM and NCA combine the advantages of LiCoO2, LiNiO2 and limno2/LiAlO2

domestic status of water-based container coating industry

the annual output of containers in the world is huge, and the annual coating value of the outer wall of containers is not cheap. Five years ago, the container coating used worldwide was basically solvent based coating. In recent years, the water-based coating in the container industry has become an industry consensus, and new water-based environmental protection coatings are being uniformly implemented all over the country, such as Maersk Dongguan Container Industry Co., Ltd. located in Guangdong, A factory specializing in the production of ordinary containers. The biggest difference here is that the working environment of the factory is more environmentally friendly and safe paint. The factory water-based paint replaces the traditional oil-based paint. The coating industry has long issued a statement that the container industry should adopt a self-discipline approach, and every enterprise consciously uses more environmentally friendly materials to replace traditional oily paint. This is the so-called "joint commitment and joint action", and this sentence is not only a slogan, but also a change from the actual results

at present, the enterprises with high VOC emission of China's container manufacturing enterprises have gone from the situation of "who protects the environment, who loses money, who insists on closing the door" to who protects the environment, and who benefits. The hardships are self-evident, but the actual results are also obvious to all. At present, the Beijing, Shanghai and Guangzhou region, where the container industry is relatively concentrated, has gradually started to promote the use of water-based coatings, and in the future, it will synchronously implement new water-based environmental protection coatings within the national zoning limit

2019 is a key year for the development of the environmental protection industry. Domestic people's awareness of environmental protection has been generally improved. The policy of changing oil to water, from top to bottom, is not only limited to container coating, but also all walks of life. Since April 1, 2017, the coating production line of national standard dry cargo container manufacturers has been changed from solvent based coating system to water-based coating system. Water-based coating uses water as the dispersion medium. Generally speaking, That is, water-based paint is mixed with water. What volatilizes during spraying and drying is water, and its VOC emission is very small. The data shows that the VOC emission of water-based coatings can be reduced by 60% to 70% compared with that of solvent based coatings, such as manufacturer, price, quality, etc. Therefore, water-based coatings are more and more popular. The external box is matched by solvent based epoxy iron red primer with water-based epoxy intermediate paint and polyurethane topcoat, and the internal solvent based epoxy primer with water-based epoxy topcoat. Such matching can not only reduce the cost of water-based coating, but also control VOC emissions. In fact, it is not only the container industry, but also the general trend of the coating industry to promote hydration, The collocation of water-based container coatings with solvent based coatings is a key point of widespread concern

development trend of water-based container coatings

in general, the advantages of water-based container coatings are: environmental protection. During the coating construction process, the discharge of water-based coatings is cleaner than that of traditional paints, and most of them are naturally degradable substances and water, so as to achieve the purpose of environmental protection. However, it should be noted that some inferior water-based paints will lead to more problems, which is mainly caused by the cumbersome process and related to the self-discipline of enterprises. In this regard, we need more guidance. Water based paint is not completely environmental friendly. For people, no matter what kind of paint is harmful, but what is certain is that the impact on the environment is very small compared with traditional paint. In particular, water-based paint is constantly updated, and every generation of products pay attention to the improvement of environmental protection performance. Due to the existence of zinc powder, waterborne epoxy zinc rich coating can effectively cathodic protect the box, delay the corrosion progress of the box, and prevent the paint film from falling off due to collision. Therefore, this system has been unanimously recognized by the industry

waterborne container coatings also have certain limitations, such as high cost and high requirements for construction environment, such as temperature, humidity, ventilation, etc., which will affect the performance of the coating, and its own construction performance is also relatively poor, which is difficult for workers to master. Due to the poor quality and construction difficulties of this generation of products, it is very difficult to promote water-based paint in China in the future. As long as workers who have been exposed to this kind of water-based paint will habitually resist. The more products are sold, the more difficult it is to promote water-based paint. Temperature difference, one of the biggest shortcomings of water-based touch up paint is the strict requirements on temperature, which is a huge challenge for construction when it works between 5~35 ℃. This leads to a series of problems, such as the problem of storage and transportation, and the control of risks. The paint film of water-based paint is thinner than that of oil-based paint, which means it is easy to be scratched. The water-based paint is also easy to crack, and the water-based paint with good quality does not have such problems. Therefore, foreign water-based paint can be considered, and the gloss and plumpness of the paint film are not as high as that of the paint; The wear resistance is not as high as that of paint, which is not suitable for desktop and writing table, but for cabinets, doors, etc. The film hardness of some water-based paints cannot reach the level of oil-based paint, so they should be painted several times more than oil-based paint, and the construction technical requirements are higher than oil-based paint. In the domestic construction environment, domestic paint construction is often extensive. Most workers like painting with high pressure and low viscosity, which is the biggest waste of paint. For paint, it is easy to cause dry spraying, and for water paint, it is easy to cause pitting. Energy consumption, compared with traditional paint, requires more energy; Sewage treatment, because the water-based coating contains a certain amount of human resources, the cost is close to 3 (4) times that of water-soluble substances, so the wastewater from the water-based spraying process is more difficult to treat than that from the solvent process. However, relatively speaking, the concentration of container coating is very high, which can be used for centralized treatment of sewage. In practical application, water-based paint requires high surface cleanliness during construction and materials, and its water resistance is a little poor. This has led many people to give up this kind of paint in the decoration

in general, the demand for water-based coatings in China in 2016 was about 1.89 million tons, accounting for less than 10% of the coating industry. With the accelerated promotion of water-based coatings in steel structures, furniture, containers and other fields, it is expected that by 2022, the market demand for water-based coatings in China will reach 6.34 million tons, with a compound growth rate of more than 20%. The introduction of the "oil to water" policy has brought benefits to water-based coating enterprises. It is believed that the popularization and application of water-based coatings in China will make long-term progress

both water-based container coatings and anti-corrosion coating industry should continue to develop. Especially in the current environment of China's diversified economic development, the anti-corrosion coating industry should accelerate its integration into international competition, pay attention to the orientation of international standards, actively respond to the new coating standards, strengthen standardization, and integrate with the world as soon as possible. With the gradual accumulation of technical knowledge of coating R & D engineers, the expansion of technical properties of raw materials, and the further improvement of coating technology, waterborne industrial coatings will further mature So as to make a great contribution to the greening of the coating industry. After the machine is adjusted to the horizontal installation. It's the so-called three parts paint, seven parts spray. In the process of research and development of water paint, the process has been an important part of research and development. There is still a long way to go for industrial water paint to completely replace paint