The Eisenach plant of General Motors AG-Germany Opel was the first factory to fully realize the water-based coating process. The original waterborne varnish technology of this plant reduced the VOC content from 55% to 12%; PPG Corporation Recently launched a new CeramiClear brand car topcoat is a waterborne nanotechnology material, is also the world's leading wear resistant scratch-resistant car easy to clean paint; AkzoNobel also announced the release of the new Lesonal HS420 color car in line with the latest emission standards Topcoat waterborne coating, which not only inherited the advantages of Lesonal2K series, but also adopted the latest dispersion technology and high solid content technology; Solutia resin and additives company also introduced three new additives, added Additol series The product is used for the painting of automotive finishes.
Water-based metal anti-corrosion coatings: Anti-corrosion coatings used to be the forbidden zone for water-based paints, but now they have finally been able to “broke in†due to the development of water-based paint technologies. And the water-based metallic paint can transform the rust layer of the metal surface into a beneficial protective layer, which is unmatched by the solvent-based paint, and is the development direction of the paint industry at home and abroad.
At present, there are many very successful metal anticorrosive waterborne coating systems in the world. For example, Jordan Water's water-based anticorrosive coating solutions have passed the world's most demanding NORSOK standard laboratory accreditation. Its Danish railway bridge solution uses water-based epoxy zinc-rich , water-based acrylic primer, water-based acrylic topcoat, after a test of time, has effectively proved the superiority of water-based coatings in the application of anti-corrosion coatings; Japan's Toshiba's two-component waterborne epoxy primer, two-component water-based ring Oxygen lacquer and single-component hindered amine hybrid resin surface protection system, its dry film thickness is 40μm × 2, 30μm and 25μm, are room temperature curing, which primer alkali resistance (5% NaOH solution 168 hours, salt spray resistance (5%) 192 hours, water resistance 1000 hours, painted oil resistant to volatile oil for 48 hours, and topcoat tested in daylight-type aging instrument for 2000 hours without abnormality, gloss retention Above 80%, the water-based corrosion coating system has no abnormalities in the three-year exposure to the outdoor waterfront of Kochi Prefecture, Shikoku Island, Japan; similarly there are Japanese Kansai Paint Company and Akzo Nobel Company. The product; US Department of Energy Brookhave National Laboratory researchers also developed a water-based paint, the basic component of this water-based coating is extracted from the shell of crabs, lobster, called a "Chitosan" material, due to Chitosan is soluble in water and does not adhere well to metals. Researchers found a "green" material from the grain to combine to obtain a dense, moisture-resistant coating that can completely adhere to metal. The product has been tested and found to protect the metal from saltwater erosion twice as long as other coatings and can even be used in harsh geothermal environments. The coating also provides good protection against metals.
Waterborne Wood Coatings: In view of the serious harm caused by solvent-based paints to the environment, the development of waterborne wood paints has received worldwide attention.
Water-based wood coatings are used earlier in European and American markets. Water-based wood coatings in China are a matter of recent years. With the increase in people’s awareness of the environment, the proportion of water-based wood lacquers will increase year by year. Currently, the market has emerged. The brand of waterborne wood lacquer, according to its main composition, is nothing more than three categories: one is acrylic based waterborne wood lacquer, its main feature is good adhesion, will not deepen the color of wood, but resistant Grinding and chemical resistance are poor. Due to its low cost and low technical content, it has become the main product on the market. The second category is water-based wood lacquer that is based on a composition of acrylic and polyurethane. Apart from adhering to the characteristics of acrylic lacquer, it also features increased abrasion resistance and chemical resistance (the first two are mostly used for doors and windows, furniture, etc. ). The third category is 100% polyurethane water-based paint, and its wear resistance is even several times that of oil-based paint. It is an advanced product in waterborne paint.
For example, the core product of BASF in Germany is BASF one-component acrylic waterborne wood coatings and BASF two-component waterborne polyurethane wood coatings. Among them, the BASF one-component acrylic waterborne wood coatings are based on three types of BASF emulsions A848S, N850S, and A857S that are environmentally friendly leading products. All three emulsions belong to self-crosslinking type acrylic resin emulsions. Among them, A848S is a basic product with excellent chemical resistance and excellent texture enhancement performance. The N850S and A857S have improved hardness, abrasion resistance and excellent resistance to pressure and viscosity and texture enhancement on the basis of the original A848S. In addition, it also introduced a new type of waterborne paper and foil coating this year, which can be applied to the painting of wood furniture. Bayer Corporation has recently developed a two-component waterborne polyurethane wood lacquer. The overall performance of this product is comparable to that of solvent-based products. Some of the properties are better. It not only has excellent scratch and abrasion resistance, but also has resistance to ordinary. The performance of household chemicals, such as the use of this paint painted furniture surface stained with red wine 5h, no change in the paint surface, and after 6h coffee stain, the paint will not have any change, in addition, whether it is detergent or Ammonia does not leave any traces after 1 h contact with the paint.
However, one thing to note is that due to differences in eating habits and lifestyles in China and Europe, the demand for waterborne wood lacquer will be even higher. Many waterborne wood coatings (including the top ten paint companies in the world) are used in foreign countries. After it was promoted to China, it encountered a lot of problems and presented a big challenge for the waterborne wood lacquer business in China. It was also the focus of its development in China in the future, namely to increase the hardness and fullness of its paint film. Heat resistance, corrosion resistance liquor and so on.
Prospects and Prospects
Although waterborne coatings have been widely developed and applied, people are increasingly aware of its benefits, but there are still some technical problems that restrict its development:
â—† The selection of neutralized amines for water dilution coatings is the most important technical formulation issue. Amine is relatively expensive relative to other materials of aqueous coatings and can increase VOC emissions.
â—† Viscosity variation in waterborne coatings. Because of the use of water as a diluent, the change in viscosity is quite different from solvent-based coatings. How to balance the viscosity and solid content is a more important issue in the formulation.
◆ The "blowout" problem of thick-baked baking-type water-based paints. The “blowout†that occurs when the water-dilutable coating is baked is more probable than solvent-based paint and is also more difficult to control.
Of course, under the general trend of paint development, the technical research of waterborne coatings has made great progress in recent years. Many problems that previously restricted the development of waterborne coatings have been well resolved. We believe that some of the above problems are only temporary. Sexual, water-based coatings will be the mainstream of future coatings industry development. (Text / Chen Longwu Pang Ying Cong)
Water-based metal anti-corrosion coatings: Anti-corrosion coatings used to be the forbidden zone for water-based paints, but now they have finally been able to “broke in†due to the development of water-based paint technologies. And the water-based metallic paint can transform the rust layer of the metal surface into a beneficial protective layer, which is unmatched by the solvent-based paint, and is the development direction of the paint industry at home and abroad.
At present, there are many very successful metal anticorrosive waterborne coating systems in the world. For example, Jordan Water's water-based anticorrosive coating solutions have passed the world's most demanding NORSOK standard laboratory accreditation. Its Danish railway bridge solution uses water-based epoxy zinc-rich , water-based acrylic primer, water-based acrylic topcoat, after a test of time, has effectively proved the superiority of water-based coatings in the application of anti-corrosion coatings; Japan's Toshiba's two-component waterborne epoxy primer, two-component water-based ring Oxygen lacquer and single-component hindered amine hybrid resin surface protection system, its dry film thickness is 40μm × 2, 30μm and 25μm, are room temperature curing, which primer alkali resistance (5% NaOH solution 168 hours, salt spray resistance (5%) 192 hours, water resistance 1000 hours, painted oil resistant to volatile oil for 48 hours, and topcoat tested in daylight-type aging instrument for 2000 hours without abnormality, gloss retention Above 80%, the water-based corrosion coating system has no abnormalities in the three-year exposure to the outdoor waterfront of Kochi Prefecture, Shikoku Island, Japan; similarly there are Japanese Kansai Paint Company and Akzo Nobel Company. The product; US Department of Energy Brookhave National Laboratory researchers also developed a water-based paint, the basic component of this water-based coating is extracted from the shell of crabs, lobster, called a "Chitosan" material, due to Chitosan is soluble in water and does not adhere well to metals. Researchers found a "green" material from the grain to combine to obtain a dense, moisture-resistant coating that can completely adhere to metal. The product has been tested and found to protect the metal from saltwater erosion twice as long as other coatings and can even be used in harsh geothermal environments. The coating also provides good protection against metals.
Waterborne Wood Coatings: In view of the serious harm caused by solvent-based paints to the environment, the development of waterborne wood paints has received worldwide attention.
Water-based wood coatings are used earlier in European and American markets. Water-based wood coatings in China are a matter of recent years. With the increase in people’s awareness of the environment, the proportion of water-based wood lacquers will increase year by year. Currently, the market has emerged. The brand of waterborne wood lacquer, according to its main composition, is nothing more than three categories: one is acrylic based waterborne wood lacquer, its main feature is good adhesion, will not deepen the color of wood, but resistant Grinding and chemical resistance are poor. Due to its low cost and low technical content, it has become the main product on the market. The second category is water-based wood lacquer that is based on a composition of acrylic and polyurethane. Apart from adhering to the characteristics of acrylic lacquer, it also features increased abrasion resistance and chemical resistance (the first two are mostly used for doors and windows, furniture, etc. ). The third category is 100% polyurethane water-based paint, and its wear resistance is even several times that of oil-based paint. It is an advanced product in waterborne paint.
For example, the core product of BASF in Germany is BASF one-component acrylic waterborne wood coatings and BASF two-component waterborne polyurethane wood coatings. Among them, the BASF one-component acrylic waterborne wood coatings are based on three types of BASF emulsions A848S, N850S, and A857S that are environmentally friendly leading products. All three emulsions belong to self-crosslinking type acrylic resin emulsions. Among them, A848S is a basic product with excellent chemical resistance and excellent texture enhancement performance. The N850S and A857S have improved hardness, abrasion resistance and excellent resistance to pressure and viscosity and texture enhancement on the basis of the original A848S. In addition, it also introduced a new type of waterborne paper and foil coating this year, which can be applied to the painting of wood furniture. Bayer Corporation has recently developed a two-component waterborne polyurethane wood lacquer. The overall performance of this product is comparable to that of solvent-based products. Some of the properties are better. It not only has excellent scratch and abrasion resistance, but also has resistance to ordinary. The performance of household chemicals, such as the use of this paint painted furniture surface stained with red wine 5h, no change in the paint surface, and after 6h coffee stain, the paint will not have any change, in addition, whether it is detergent or Ammonia does not leave any traces after 1 h contact with the paint.
However, one thing to note is that due to differences in eating habits and lifestyles in China and Europe, the demand for waterborne wood lacquer will be even higher. Many waterborne wood coatings (including the top ten paint companies in the world) are used in foreign countries. After it was promoted to China, it encountered a lot of problems and presented a big challenge for the waterborne wood lacquer business in China. It was also the focus of its development in China in the future, namely to increase the hardness and fullness of its paint film. Heat resistance, corrosion resistance liquor and so on.
Prospects and Prospects
Although waterborne coatings have been widely developed and applied, people are increasingly aware of its benefits, but there are still some technical problems that restrict its development:
â—† The selection of neutralized amines for water dilution coatings is the most important technical formulation issue. Amine is relatively expensive relative to other materials of aqueous coatings and can increase VOC emissions.
â—† Viscosity variation in waterborne coatings. Because of the use of water as a diluent, the change in viscosity is quite different from solvent-based coatings. How to balance the viscosity and solid content is a more important issue in the formulation.
◆ The "blowout" problem of thick-baked baking-type water-based paints. The “blowout†that occurs when the water-dilutable coating is baked is more probable than solvent-based paint and is also more difficult to control.
Of course, under the general trend of paint development, the technical research of waterborne coatings has made great progress in recent years. Many problems that previously restricted the development of waterborne coatings have been well resolved. We believe that some of the above problems are only temporary. Sexual, water-based coatings will be the mainstream of future coatings industry development. (Text / Chen Longwu Pang Ying Cong)
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