Water paint is a paint that uses water as a thinner and does not contain organic solvents. It has the characteristics of energy saving and environmental protection, non-combustible and non-explosive, ultra-low emission, low-carbon health, etc. It can be widely used in many materials such as wood, metal, industrial coating, plastic, glass, building surface and so on. From a long-term perspective, the application of waterborne coatings is the future development trend.
Analysis of the application field of waterborne coatings in my country
Analysis believes that the development of water-based industrial coatings by coating companies has undoubtedly the greatest benefit to the environment, and can also lower the price of foreign water-based industrial coating brands on the current market, benefiting domestic consumers. However, water-based industrial paint is a high-tech environmentally friendly high-end product, and the production process is also very different. Paint companies should proceed step by step in this regard, and should not rush to achieve success, otherwise let immature water-based paint products flow to the market The development and operation of the entire waterborne industrial coatings industry will be affected. The following is an analysis of the application areas of waterborne coatings in my country.
Water-based industrial coatings are mainly used in automobiles, railway vehicles, bridges, pipelines, steel structures, containers and other fields. At present, the water-based level of domestic industrial coatings is far behind that of industrially developed countries.
With the rapid development of the automotive industry, the amount of automotive coatings is also increasing. Since Shanghai General Motors launched its first waterborne automotive coating production line in Shanghai in 2008, all new domestic automotive paint production lines have been designed with waterborne coatings. Waterborne coatings have become the mainstream of automotive coatings. Automotive coatings mainly include primers, intermediate coatings, and topcoats, of which topcoats are divided into natural paints and metallic flash paints. The water-based process of automotive coatings is carried out gradually from the bottom to the surface. As early as the 1960s, developed countries such as Europe and the United States have taken the lead in using water-based electrophoretic primers. At present, more than 90% of primers have used water-based coatings, and 88% of automobile intermediate coatings have also adopted water-based technologies. The application of lacquer exceeds 65%.
Railway vehicle coating:
Most of the body coatings use traditional solvent-based paints, which contain a large amount of organic solvents, which brings inconvenience and safety risks to storage, transportation and construction. The harmful gases released during the production and use of solvent-based coatings will have a negative impact that cannot be ignored on the health of employees and the atmospheric environment. In developed countries, powder coatings, liquid coatings with 100% solids content, and water-based coatings have become the mainstream coating system in the railway vehicle manufacturing industry, and the application of water-based coatings is becoming more and more widespread. At present, more than 13,000 Huabao waterborne industrial paint coating vehicles have been successfully applied in the field of railway trucks in China. After more than 5 years of verification, the products can fully meet the quality standards of solvent-based products; the development of waterborne coating systems for railway locomotives The paint company has also completed and started testing after painting. The localization and water-based process of coatings in the fields of electric cars, high-speed rail and rail transportation have also entered the work plan of the General Railway.
Heavy-duty anti-corrosion coating:
The corrosion and rust of metal products can be seen everywhere in daily life, causing waste of resources and energy, economic losses, and sometimes even threatening personal safety. According to some corrosion loss data published by the United States, Japan, Canada and other countries, the direct economic loss caused by corrosion accounts for 1% to 4% of the total output value of the national economy, and the annual corrosion and rusty steel accounts for about 20% of the annual output, about 30% Equipment was scrapped due to corrosion. The economic loss caused by metal corrosion in our country accounts for about 4% of the gross national product every year. Such amazing loss has stimulated the development of anti-corrosion coatings. The development of environmentally friendly industrial heavy-duty coatings is a high-tech project actively being explored by coating experts in many developed countries around the world, and it is also an emerging field in China. In some typical heavy-duty coating markets, such as infrastructure, oil and gas, power, tanks, marine and chemical industries, the use of water-based coatings is increasing. Waterborne alkyd system, waterborne epoxy system (epoxy cloud iron middle coating and epoxy zinc rich primer), waterborne inorganic zinc rich system, waterborne epoxy ester system, etc. are used in heavy corrosion protection field.
Waterborne container coating:
Currently, the world's annual container production exceeds 3.5 million TEUs, and the annual demand for paint is about 400,000 tons, worth about 6 billion yuan. At present, most of the container coatings used in the world are solvent-based. In the process of container spray painting, a large amount of harmful gases will be generated, which not only endangers the health of paint spraying workers, but also causes environmental pollution. With the increasingly strict environmental protection regulations, the International Container Standardization Committee puts forward higher requirements for the environmental protection and hygiene of container coatings: for example, the coatings must not contain heavy metals such as Cd, Pb, Cr, Hg; non-toxic pigments such as phosphate; high solids Points, low VOC, etc. Acrylic topcoats have replaced chlorinated rubber topcoats and special paints for tank bottoms have also begun to advance gradually. Pilot application of waterborne container coatings has begun in China.