Two-component waterborne acrylic polyurethane coating and preparation method thereof
An acrylic polyurethane, two-component technology, applied in the field of coatings, can solve the problems of difficulty in removing emulsifiers, high cost of demulsification, and unsatisfactory performance of coating film gloss, etc., and achieves appropriate particle size distribution width and solvent resistance. Excellent performance and high adhesion
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Embodiment 1
[0031] (1) Add 50 parts (parts by weight) of solvent butanone into a four-neck flask equipped with a thermometer, a stirrer and a condenser tube, and heat to reflux. Then dropwise add 27 parts of methyl methacrylate, 8 parts of styrene, 6 parts of butyl acrylate, 3 parts of acrylic acid, 6 parts of hydroxypropyl acrylate and 1 part of thermal initiator benzoyl peroxide through the constant pressure dropping funnel. The mixture is added dropwise for about 2 to 3 hours. After the dropwise addition, it is kept for 1 hour, and a small amount of thermal initiator is added, and the reaction is kept for about 2 hours. Cool down to 50-60°C, add a certain amount of neutralizing agent triethylamine to neutralize until the neutralization degree is 80%-100%, remove the solvent by vacuum distillation, add an appropriate amount of deionized water, and stir mechanically to obtain aqueous hydroxyl Acrylic. The obtained water-based hydroxyacrylic resin has a solid content of 49%, a hydroxyl c...
Embodiment 2
[0035] (1) Add 50 parts (parts by weight) of solvent acetone into a four-neck flask equipped with a thermometer, a stirring meter and a condenser tube, and heat to reflux. Then 25 parts of methyl methacrylate, 8 parts of styrene, 5 parts of butyl acrylate, 4 parts of methacrylic acid, 8 parts of hydroxyethyl acrylate and 1 part of thermal initiator azobisiso For the mixture of butyronitrile, the dropwise addition time is about 2 to 3 hours. After the dropwise addition, keep warm for 1 hour, add a small amount of thermal initiator, and then keep warm for about 2 hours. Cool down to 50-60°C, add a certain amount of neutralizing agent triethylamine to neutralize until the neutralization degree is 80%-100%, remove the solvent by vacuum distillation, add an appropriate amount of deionized water, and stir mechanically to obtain aqueous hydroxyl Acrylic. The obtained water-based hydroxyl acrylic resin has a solid content of 49.3%, a hydroxyl content of 2%, and a viscosity of 1688 mP...
Embodiment 3
[0039] (1) Add 50 parts (parts by weight) of solvent butanone into a four-neck flask equipped with a thermometer, a stirrer and a condenser tube, and heat to reflux. Then, 26 parts of methyl methacrylate, 7 parts of styrene, 3 parts of butyl acrylate, 4 parts of acrylic acid, 10 parts of hydroxyethyl acrylate and 1 part of thermal initiator benzoyl peroxide were added dropwise through a constant pressure dropping funnel. The mixture is added dropwise for about 2 to 3 hours. After the dropwise addition, it is kept for 1 hour, and a small amount of thermal initiator is added, and the reaction is kept for about 2 hours. Cool down to 50-60°C, add a certain amount of neutralizing agent triethylamine to neutralize until the neutralization degree is 80%-100%, remove the solvent by vacuum distillation, add an appropriate amount of deionized water, and stir mechanically to obtain aqueous hydroxyl Acrylic. The obtained water-based hydroxyacrylic resin has a solid content of 49.5%, a hy...
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Abstract
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