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In recent years, relevant national departments and industry associations have formulated and promulgated laws, regulations and policies, emphasizing the development of the coating industry towards environmental protection and green direction, supporting and encouraging the promotion and application of water-based coatings and other environment-friendly products. In the face of increasingly strict environmental protection policies, coating raw material suppliers, coating production enterprises, coating equipment enterprises are speeding up the transformation and development of water-based coating and other environmental protection products.
In recent years, the understanding and imagination of domestic coating produced profound changes, environmental protection coating output rose year by year. From traditional solvent-based coatings to water-based coatings, powder coatings and other environmentally friendly coatings, customers have greatly transformed the production, sales and service links. As can be expected, coating terminals are also undergoing a major reconfiguration.
The first cold-coated zinc product in a real sense was successfully developed in Switzerland in 1975. Since then, cold-coated zinc has been gradually developed and applied. In recent 30 years, cold - coated zinc coatings have developed rapidly. At present, cold-coated zinc products are widely used in steel structures in electric power, petrochemical, communication and bridge anticorrosion fields. Cold-coated zinc is also known as cold-sprayed zinc, cold-galvanized, coated zinc and zinc-based coating in the anticorrosion industry. In 2015, the Ministry of Industry and Information Technology issued the standard of "HG/ T4845-2015 cold-coated zinc coating". In 2019, the Ministry of Communications issued the "JT/T1266 -- 2019 Cold spray zinc corrosion technical conditions" standard. Now the industry is more and more similar products to "cold coated zinc coating" or "cold spray zinc coating" to name.
Due to various reasons, water-based steel bucket paint in the construction process often because of environmental, technical and other reasons there are some problems, do not panic when encountering these problems, analyze the problem, solve the problem, and avoid the next time the same problem is king. Here for you to focus on several problems often occur, and provide technical solutions, I hope to help in the construction process.
As people's environmental protection consciousness to strengthen, more and more industrial enterprises advocate green coating, water-based paint coating to improve the workshop environment, reduce the pollution to the environment, to the person and the natural environment has played a very good improvement effect, currently, more and more industrial companies, chose the water-based paint coating, in "oil to water" rapid advance in the use of water-based paint for the first time, The construction of water-based paint is slightly different from that of oil-based paint, and there are some precautions in the construction site. It is easy to make mistakes without experience, which will affect the painting effect.
Problems existing in the use of packaging
The flashing rust of waterborne paint is a problem that has troubled people for a long time. The generation of flash rust is an electrochemical process, which is related to the dissolution and precipitation of metal compounds. Because waterborne coating itself is a conductor, it forms a charge transfer channel in different areas with potential difference, and produces corrosion under the action of water and oxygen. Different metal substrate, water-based coating in the construction process of flashing rust phenomenon of the speed or degree is different, the general situation of flashing rust is: cast iron > aluminum > carbon steel > galvanized sheet (grinding)>Tinplate (polished)> Iron plate (or wire > aluminum alloy.
Waterborne industrial coatings have become the main development direction of coatings industry at home and abroad. Waterborne coating has the advantages of low toxicity and environmental protection, non-inflammable and non-explosive, but its anti-mildew and antibacterial performance is poor. Especially in the hot and humid summer, it is the season with high incidence of all kinds of bacterial community reproduction. Mildew and corruption before and after the effect of painting is fatal, it will destroy the structure of paint, black, smelly phenomenon, improper treatment, and will pollute water, pollution of the environment. So how to waterborne paint mildew, anti-corrosion? How should the water paint after corruption be handled scientifically?
In recent years, China's steel barrel manufacturing equipment manufacturing industry develops rapidly, new equipment manufacturing enterprises and new equipment and new technology emerge in endlessly, the export volume of barrel manufacturing equipment is also increasing day by day.
In recent years, because of its environmental protection, waterborne paint has been rapidly developed. In response to this trend, the application of alkynediol surfactant in waterborne paint industry has also been rapidly increased. We need to pay attention to the fact that water-based paint is very different from oily paint in construction properties, especially in the moderate summer. Temperature and humidity are two important factors in the construction process of waterborne paint. The industry experience is summarized as follows.
Metal plate laminating technology is the plastic film and metal plate through high temperature hot pressing, the film on the metal plate processing technology.Film covering technology was born in Japan in 1977, originally used for metal containers, can replace inside coating, outside coating technology, so far has developed to building materials inside and outside decoration, home appliances, cars and other fields.Film processing due to the use of adhesives, solvents, so does not contain formaldehyde, and plastic film can be beautification decoration, antibacterial, anti-dyeing and other processing, to ensure the safety and health of the human body, but also played a role in environmental protection.
At present, the main recovery methods of VOCS are: absorption method, adsorption method, condensation method and membrane separation method, usually adsorption and condensation method, adsorbent preferred activated carbon, because activated carbon has strong adsorption capacity, acid and alkali resistance, heat resistance, sufficient raw materials, easy regeneration advantages, the general process is: adsorption, desorption, condensation recovery.Desorption is to create conditions corresponding to low load, introduce material or energy to weaken or disappear the force between adsorbent molecules and activated carbon, remove the reversible adsorbent.The traditional desorption methods include steam, hot gas desorption, pressure swing desorption and solvent replacement. In recent years, there are new desorption methods such as electrothermal method, ultrasonic regeneration method and microwave irradiation.Here's a look:
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