Coatings using water as solvent or dispersion medium can be called water-based coatings. Waterborne coatings include water soluble coatings, water dilutive coatings and water dispersible coatings (latex coatings). Water soluble coatings are based on water soluble resin as film-forming material, represented by polyvinyl alcohol and its various modifiers, in addition to water soluble alkyd resin, water soluble epoxy resin and inorganic high molecular waterborne resin.
In order to standardize and improve the production process and product technical indicators of paint enterprises and promote the progress of the entire paint industry, the Ministry of Industry and Information Technology has formulated 14 relevant standards for the paint and pigment industry to regulate the healthy development of the entire paint industry.
The introduction of the new standard will help to improve the overall level of the development of the domestic paint industry, but also in order to face the growing demand for environmental protection in society. The new standard contains a large number of technical indicators aimed at reducing VOC emissions and reducing environmental pollution.
The topic of replacing "oil" with "water" in the paint industry has been widely discussed, and the implementation of the paint consumption tax collection measures this year is also considered by industry insiders to lead to changes in the paint industry. On February 1 this year, after the implementation of the national policy of levying 4% consumption tax on coatings with VOC content of more than 420 g/l (including 420 g/l), the transformation and upgrading process of traditional solvent based industrial coatings enterprises towards environmental protection such as water-based and powder has been irreversible.
More and more consumers in the market also believe that paint products with traditional production concepts are no longer suitable for the environmental protection needs of contemporary society, and water-based coatings are the ideal coatings that meet the new concept of environmental protection and healthy life.
Among many waterborne coating systems, waterborne polyurethane coatings, waterborne epoxy resin coatings and waterborne acrylic resin coatings are the most concerned areas. Since June 1, 2015, HG/T4761-2014 Waterborne Polyurethane Coatings, HG/T4759-2014 Waterborne Epoxy Resin Anticorrosive Coatings Three product standards for water-based industrial coatings, including HG/T4758-2014 Waterborne Acrylic Resin Coatings, will be officially implemented. The implementation of these standards will be an important milestone in the development of water-based industrial coatings in China.
The new standard of HG/T4761-2014 Waterborne Polyurethane Coatings is applicable to the room temperature self drying sheet with water as the dispersion medium, polyurethane resin as the main film-forming substance, pigments, fillers (no varnish) and additives added to the surface of some inorganic non-metallic substrates such as metal, cement mortar and concrete for decoration and protection Two component and one component high temperature baking waterborne polyurethane coatings.
At present, the market of waterborne polyurethane coatings in China is in the initial stage and has not really formed a scale. However, with the general improvement of the environmental awareness of the whole society, especially the increasingly strict requirements of environmental protection laws and regulations of various countries on the VOC content in coatings, the increasingly mature technology and the gradual reduction of raw material costs, waterborne polyurethane coatings will usher in a vigorous development opportunity.
The new standard of HG/T4759-2014 Waterborne Epoxy Resin Anticorrosive Coatings is applicable to water-borne epoxy resin anticorrosive coatings for metal substrates. It puts forward relevant technical index requirements for primer, intermediate paint and finish paint respectively.
Epoxy coatings account for a large proportion of anti-corrosion coatings for steel structures. While the traditional solvent based epoxy coatings produce a large number of volatile organic volatiles in the production and construction process, so the water-based development of epoxy resin has been put on the agenda.
Although waterborne epoxy resin has been studied for more than 25 years and waterborne epoxy coating has also been applied for more than 10 years, from the perspective of overall application, waterborne epoxy resin and water-borne epoxy coating based on it have not yet formed large-scale production and application. At present, the quality and protective effect of waterborne epoxy anti-corrosion coatings on the market are not satisfactory, and coating accidents often occur.
The introduction of the new standard has standardized all links of production, construction and application of water-based epoxy resin anti-corrosion coatings, which will certainly promote the technical progress and market popularization of such coatings.
HG/T4758-2014 Waterborne Acrylic Resin Coatings is applicable to water-borne single component or two-component coatings with acrylate resin as the main film-forming material. The products are mainly used for decoration and protection of metal surfaces.
Waterborne acrylic resin coating products are not only used for protection of steel and other metals in industrial or civil fields, but also can be used for protection of cement or wood in many cases.
This water-based coating has great competitiveness in terms of environmental protection, performance and price, including weather aging resistance, reducing the content of volatile organic compounds, etc. The product has been popularized to a considerable extent abroad, and its application is more and more extensive in China.
At present, there are many water-based acrylic protective coatings on the market. In the past, there were no uniform standards and specifications, so the product quality, environmental protection requirements and construction effects were uneven. It is believed that the introduction of new standards will quickly change this situation.
In fact, based on the current development status of the industry, water-based coatings still have a long way to go before they are fully popularized. As we all know, the national pace of environmental protection is urging all industries to complete environmental transformation, and the extensive situation of high pollution in the paint industry is expected to be further improved. Relevant new policies and standards are also boosting and gradually releasing the market potential of water-based coatings, and the prospect of water-based coatings will be unlimited.
