A kind of waterborne polyurethane coating and its preparation method and application
A technology of water-based polyurethane and coatings, applied in the field of coatings, can solve problems such as insufficient chemical resistance, and achieve the effect of excellent flexibility
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Embodiment 1
[0047] The preparation method of waterborne polyurethane coating is as follows:
[0048]Take 80g of water-based polyurethane resin, the hydroxyl value is 100mgKOH / g, and add the leveling agent BYK-381 (German BYK leveling agent, ionic polyacrylate, model BYK-381, abbreviated as Leveling agent BYK-381) 0.5g, add diethylene glycol butyl ether (BDG) solvent 6g, then stir for 10 minutes, add drier bismuth methanesulfonate 0.1g under stirring condition, thickener BYK425 (Germany BYK thickener, associative polyurethane, model BYK425, abbreviated as thickener BYK425) 0.8g, disperse for 15-20 minutes, add defoamer TEGO902W (German Dego defoamer, poly Ether siloxane copolymer emulsion, model TEGO902W, abbreviated as defoamer TEGO902W) 0.3g, wetting agent TEGO270 (German Tego wetting agent, polyether siloxane copolymer, model TEGO270, abbreviated as wetting agent TEGO270) 0.5g, water 6.8g, after dispersing for 5-10 minutes, filter with 300 mesh gauze to get the finished product.
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Embodiment 2
[0088] The spraying water-based polyurethane PU coating described in this embodiment is composed of a first component and a second component, and the molar ratio of -OH contained in the first component to -NCO contained in the second component is 1 / 1.2;
[0089] The preparation method of described spraying water-based polyurethane PU coating is as follows:
[0090] Take 70g of water-based polyurethane resin, its hydroxyl value is 100mgKOH / g water-based polyurethane resin 15g, its hydroxyl value is 50mgKOH / g, add leveling agent BYK-3810.5g in the process of stirring at 1000 rpm, add BDG solvent 6g, and then Stir for 10 minutes, add drier bismuth methanesulfonate 0.1g, thickener BYK425 0.8g, disperse for 18 minutes, add defoamer TEGO902W 0.3g, wetting agent TEGO270 0.5 under stirring at 800 rpm g, 6.8g of water, after dispersing for 10 minutes, filter with 300 mesh gauze to get the finished product.
Embodiment 3
[0104] The water-based polyurethane PU coating for spraying described in this embodiment is composed of a first component and a second component, and the molar ratio of -OH contained in the first component to -NCO contained in the second component is 1 / 1.2; wherein , the water-based polyurethane resin is composed of a water-based polyurethane resin with a hydroxyl value of 100 mgKOH / g and a water-based polyurethane resin with a hydroxyl value of 50 mgKOH / g.
[0105]The preparation method of described spraying water-based polyurethane PU coating is as follows:
[0106] Take 60g of water-based polyurethane resin, whose hydroxyl value is 100mgKOH / g, 25g of water-based polyurethane resin B, whose hydroxyl value is 50mgKOH / g, add 0.5g of leveling agent BYK-381 during stirring at 1000 rpm, and add BDG solvent 6g, then stir for 10 minutes, add drier bismuth methanesulfonate 0.1g, thickener BYK425 0.8g, disperse for 15-20 minutes, add defoamer TEGO902W 0.3 under stirring at 500-800 rp...
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