Due to the outstanding advantages of water-based coatings, the application in the field of general industrial coatings has been expanding in the past 10 years, and has replaced many conventional solvent-based coatings. With the increasingly stricter restrictions on volatile organic compounds and toxic substances in various countries, as well as the optimization of resins and formulations and the development of suitable additives, it is expected that waterborne coatings will replace solvents in metal antirust coatings, decorative coatings, architectural coatings, etc. Type coatings will make breakthrough progress. In water-based coatings, latex paints have an absolute advantage, for example, American latex paints account for 90% of architectural coatings. Latex paint research results account for about 20% of all paint research results. Waterborne polyurethane coating is a type of waterborne coating that has developed rapidly in recent years. In addition to the high strength and wear resistance of ordinary polyurethane coatings, it has no pollution to the environment, poisoning and fire hazard. The flexibility, mechanical strength, abrasion resistance, chemical resistance, and durability of water-based polyurethane coatings are all excellent. Europe, the United States, and Japan all regard them as high-performance modern coating varieties and vigorously develop them.
In the coating industry, powder coatings belong to the fastest growing category. Due to the increasingly strict pollution control of environmental regulations, it is required to develop pollution-free and resource-saving coating varieties. Therefore, solvent-free powder coatings with comprehensive protection and decoration properties have achieved rapid development due to their unique economic and social benefits. The main varieties of powder coatings are epoxy, polyester, acrylic and polyurethane powder coatings. In recent years, polyurethane powder coatings have attracted attention due to their excellent properties.
High solids coating
With the strengthening of environmental protection measures, high-solids coatings have developed rapidly, and the application of amino, acrylic and amino-acrylic coatings is more common.
In recent years, the United States Mobay has developed a new topcoat for automobile assembly lines. This high solids, one-component polyurethane modified polymer system can be used on rigid and flexible substrates, and has excellent acid resistance, hardness and pigment kneadability.
Light curing coating
Light-curing paint is also a kind of paint that saves resources without using solvents, and is mainly used for wood furniture. Among the varieties of wood furniture furniture in developed countries, photo-curable coatings have great market potential and are favored by large enterprises. Due to the needs of the flow of wood furniture, there are more than 700 large light curing coating lines in the United States, and about 40% of high-end furniture in Germany, Japan and other countries use light curing coatings.
In recent years, the coatings industry has developed various high-performance epoxy resin coatings, polyurethane coatings, acrylic coatings, and inorganic zinc coatings based on traditional oil-based coatings, phenolic resin coatings, and alkyd resin coatings, These types of coatings contain a large amount of organic solvents, which does not meet the current environmental protection requirements. In order to reduce harmful substances and protect the environment, paint manufacturers have developed a series of solvent-free epoxy resin coatings, which are favored by the market.
Solvent-free coatings, also known as active solvent coatings, refer to solvents that eventually become components of the coating film and do not emit VOCs to the atmosphere during the curing process. Solvent-free paint is a paint made of synthetic resin, curing agent and active solvent. All components in the formulation system, except for a small amount of volatilization, participate in the curing reaction to form a film, which has little environmental pollution. Solvent-free epoxy resin and modified coatings are a new type of high-performance coatings, which are currently produced by many well-known foreign coating companies. It mainly includes: solvent-free epoxy resin floor coating, acrylate modified epoxy resin, multi-functional epoxy resin.
Art paint is a new type of wall decoration art material, which originated in Europe at the earliest, and the craftsmanship also spread from Europe. In the 20th century, after entering the domestic market, it was popular and respected by people for its novel decoration style.
Not long ago, it was reported that the Italian Tassani (Chinese name: Tassani) Group will set up a production base in China. If the news is true, then Tassani will become the first Italian local paint brand to set up a production base in China. At the same time, I also learned that the first investment of the Italian Tassani Group in the Chinese market reached 3 million euros, and launched Italian original art paint and water-based wood paint for Chinese consumers.
In recent years, the Dutch company Sigma has successfully developed a new tin-free antifouling paint. Its self-polishing property is the same as the existing tin-containing antifouling paint. Recently, a new anti-fouling coating for marine organisms free of organotin and cuprous oxide, which is non-toxic to aquatic organisms, has been developed by Kansai Coatings Corporation of Japan.
Foreign countries attach great importance to the development of long-term anti-corrosion coatings. The main varieties are inorganic zinc-rich paint, epoxy asphalt, vinyl resin, thick paste chlorinated rubber, solvent-free epoxy polyamide and solvent-free epoxy mortar coatings. Filled with 20% to 30% of flake glass powder filled with long-lasting anticorrosive coating composed of bisphenol A epoxy resin, isophthalic acid unsaturated polyester, epoxy acrylic resin and other base materials, used for coating marine facilities , Its anti-corrosion life exceeds 10 years.
Cathode battery coating
Such coatings have developed rapidly abroad and have achieved many new achievements. Among them, the most representative is the development of thick-film cathode electrophoretic coatings, low-temperature curing type and color cathode electrophoretic coatings. Thick-film cathodic electrophoretic coating is a new type of cathodic electrophoretic coating developed by PPG in the United States. It has a relatively thick film formation, smooth appearance and excellent performance. The low-temperature curing anionic electrophoretic coating is a new variety jointly developed by Japan Shendong Coating Company and Japan Oil and Fats Company in the late 1980s. The standard curing conditions of the coating are 130/20min or 160/5min. The color cathodic electrophoretic coating was developed by Kansai Paint Co., Ltd., based on epoxy resin, with special isocyanate cross-linking, and with a third component acrylic resin, can be deposited uniformly in the electrophoresis to form a composite coating film. This technology can make the epoxy resin cathodic electrophoretic coating color, and also improve the weather resistance of the coating. Edge antirust type cathodic electrophoretic coatings are required to reduce the fluidity of the coating film when it is melted and improve the edge coverage of the coating film to improve the corrosion resistance of the cathode electrophoretic coating edges. my country should focus on the development of thick-film cathode electrophoretic paint with a thickness of 30 to 40 microns and a salt spray resistance of 1000h and a common cathode electrophoretic paint with a salt spray resistance of more than 720h.
In order to meet the needs of improving the performance and variety of coating products, the performance of the required pigments should be continuously improved, and organic pigments such as azo, phthalocyanine, and anthraquinone pigments with excellent light resistance and solvent resistance should be used more widely. . Expanding the use of auxiliary materials in coatings is becoming increasingly important for the development of coatings. Such as ultraviolet absorbers used in coatings, can improve light resistance; antioxidants can improve aging resistance; with the development of waterborne coatings, the variety of wetting agents will continue to expand; in the use of ultraviolet drying paints, the use of light curing agents. These auxiliary materials will be more widely used in the future.