A high-solid clean-odor type alkyd polyurethane white topcoat
An alkyd polyurethane, high-solid technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of high molecular weight, clean taste alkyd resin molecular chain length, low hydroxyl value, etc., to achieve fast drying speed, Excellent adhesion, fast solvent evaporation effect
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Embodiment 1
[0036] A kind of high-solid net taste alkyd resin A, its preparation process is as follows:
[0037] a), by weight percentage, sequentially add 23.5 parts of castor oil, 7.2 parts of isophthalic acid, 26.5 parts of phthalic anhydride, 3.0 parts of adipic acid, 10.0 parts of glycerin, 5.0 parts of trimethylolpropane, 1,4-butanediol Add 4.5 parts into the reaction kettle, start heating, when the material in the kettle is completely melted, feed N 2 , start stirring and raise the temperature to 120°C, add 0.5 part of organotin catalyst, then raise the temperature to 165°C~180°C, add 6.0 parts of benzoic acid and 3.5 parts of reflux solvent, keep the reaction for 2~3 hours, and remove the water brought out by the reflux reaction 6.2 parts, and the cooled reflux solvent is transported to the top of the packed tower with a circulation pump and gets back to the reactor;
[0038] b), when the separated water is very little, add C 10 10.0 parts of glycidyl tert-carbonate and 3.5 part...
Embodiment 2
[0041] A kind of high-solid net taste alkyd resin B, its preparation process is as follows:
[0042] a), by weight percentage, sequentially add 25.0 parts of soybean oil, 18.0 parts of phthalic anhydride, 12.0 parts of adipic acid, 4.5 parts of maleic anhydride, 12.0 parts of glycerin, 5.2 parts of trimethylolpropane, and 4.0 parts of neopentyl glycol into In the reaction kettle, start heating, when the material in the kettle is completely melted, feed N 2 , start stirring and raise the temperature to 120°C, add 0.4 parts of rare earth catalyst, then raise the temperature to 165°C~180°C, add 6.0 parts of benzoic acid and 3.2 parts of reflux solvent, keep the reaction for 2~3h, and remove 5.8 parts of water brought out by the reflux reaction Parts, and the cooled reflux solvent is transported to the top of the packed tower with a circulation pump and returned to the reactor;
[0043] b), when the separated water is very little, add C 10 8.0 parts of glycidyl tertiary carbonat...
Embodiment 3
[0048] A kind of titanium dioxide slurry, its preparation process is as follows:
[0049] According to the weight ratio of the formula, add 23.7 parts of solvent and 25.0 parts of high-solid clean alkyd resin B into the dispersion tank and dissolve evenly, add 4.5 parts of EFKA-4310 color paste dispersant and 0.3 parts of defoamer, stir evenly, slowly Add 45.0 parts of rutile titanium dioxide, then disperse at a high speed of 1000-1200r / min for 30-45 minutes, move to a sand mill and grind for 3-4 times until the fineness of the color paste reaches ≤10μm, and put it in the paint bucket Degassing in medium, adding 1.5 parts of thickening and anti-sedimentation agent to adjust viscosity, filtering and packaging, to obtain titanium white paste with a color content of 45% and a non-volatile fraction of 75%.
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