Composite modified polyurethane emulsion
A polyurethane emulsion and composite modification technology, applied in the chemical industry, can solve the problems of poor flexibility, large formula calculation error, low self-crosslinking density, etc., and achieve the effects of good chemical resistance, water resistance and flexibility.
Inactive Publication Date: 2013-07-31
AODA KOALA PAINT HUIZHOU
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Problems solved by technology
The use of terephthalic acid reclaimed material is more complicated because of its components. In addition to mainly containing terephthalic acid, it also contains a small amount of impurities such as benzoic acid, maleic anhydride, trimellitic anhydride, etc., which makes the formula design difficult and the formula calculation error is large. Therefore, in In the formula design of alkyd resin, increase its working constant to ensure that the reaction can proceed normally to obtain the alkyd resin for wood lacquer we need; at the same time, due to the symmetrical structure of terephthalic acid, it is difficult to carry out the esterification reaction. The completely prepared resin is opaque and cloudy in appearance, and its performance cannot meet the requirements of wood varnishes
The main reason for the above-mentioned technical problems of water-based coatings is that the component in water-based coatings that determines its performance - water-based emulsion - is caused by insufficient crosslinking density during the film-forming process. The hardness of water-based PU emulsion is low, water-resistant, resistant The reasons for poor chemicals and poor flexibility are mainly due to the inability of silicone and epoxy branches to effectively chemically crosslink with the PU polymer in the PU emulsion during the composite modification process, and the self-crosslinking density during the film formation process. caused by too low
Method used
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[0013] According to the formula in the 1-18 embodiment number of Table 2-4, under the protection of dry nitrogen, in a closed reaction kettle equipped with a thermometer, a stirring device and a reflux condenser, under stirring, an appropriate amount of isocyanate, polyether Dihydric alcohol N210 and catalyst DBTL were put into the reaction kettle, the temperature was raised to 80-85°C and reacted for 2 hours, the temperature was lowered to 75-80°C, and the chain extender was added to react for 30 minutes. Content, after reaching the theoretical setting value, add hydrophilic chain extender and react for about 1.5 h; further reduce the temperature to 65°C, add epoxy resin and silicone resin, and continue to keep warm for 2 h; cool down to 20-25°C to After diluting with a proper amount of acetone, add a neutralizer to neutralize, and then carry out shear emulsification in deionized water at room temperature; finally, remove the acetone by vacuuming to obtain a composite modified...
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The invention belongs to the field of chemical industry and particularly discloses a composite modified polyurethane emulsion. The composite modified polyurethane emulsion comprises the following components in percentage by weight: 18 to 28 percent of isocyanate, 10 to 20 percent of polyether diol N210, 0.2 to 1.0 percent of catalyst dibutyltin dilaurate (DBTL), 2 to 8 percent of chain extender, 1 to 5 percent of hydrophilic chain extender, 2 to 10 percent of acetone, 4 to 6 percent of epoxy resin, 4 to 6 percent of organic silicon resin, 2 to 5 percent of neutralizer and the balance of water. The composite modified polyurethane emulsion has high self-crosslinking density. A waterborne coating which is prepared from the composite modified polyurethane emulsion has the characteristics of high hardness, water resistance, chemical resistance, and flexibility.
Description
technical field [0001] The invention relates to the technical field of chemical industry, more specifically, the invention relates to a kind of self-crosslinking composite modified polyurethane emulsion and the obtained coating. Background technique [0002] Paint or coatings are decorative materials commonly used in modern human life. At present, the traditional preparation of alkyd polybasic acid for this kind of decoration is mostly phthalic anhydride, whose production formula is easy to adjust and the production process is mature. The use of terephthalic acid reclaimed material is more complicated because of its components. In addition to mainly containing terephthalic acid, it also contains a small amount of impurities such as benzoic acid, maleic anhydride, trimellitic anhydride, etc., which makes the formula design difficult and the formula calculation error is large. Therefore, in In the formula design of alkyd resin, increase its working constant to ensure that the...
Claims
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IPC IPC(8): C08G18/66C08G18/58C08G18/48C08G18/38C09D175/08
Inventor 陈日云袁进松
Owner AODA KOALA PAINT HUIZHOU