Preparation method of water-based urethane acrylate water paint
A polyurethane acrylate and water-based paint technology, applied in the field of coatings, can solve the problems of poor emulsion stability, low emulsion conversion rate, and low water absorption rate of the film, and achieve the effect of improving stability and increasing water absorption rate
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example 1
[0020] According to the mass ratio of 1:2, take polypropylene glycol and isophorone diisocyanate and add them to a four-necked flask equipped with a condenser, a thermometer, a stirrer and a constant pressure dropping funnel, and add 5% of the quality of polypropylene glycol Put acetone in a four-necked beaker, place the four-necked flask in a water bath at 80°C, stir for 2 hours at a speed of 700r / min; Butyl tin, and the mixed solution prepared by mixing dimethylolpropionic acid and 1,4-butanediol at a mass ratio of 1:1 was added to the constant pressure dropping funnel, and added dropwise at a speed of 0.5mL / s To the four-neck flask, after the dropwise addition, stir at a speed of 400r / min for 2~3h; add triethylamine with 10% of the mass of polypropylene glycol, react for 30min, add deionized water and polypropylene glycol with 1.5 times the mass of polypropylene glycol Ethylenediamine with a mass of 50%, adjust the rotating speed to 1500r / min, and stir for 30min to obtain a...
example 2
[0022] According to the mass ratio of 1:2, take polypropylene glycol and isophorone diisocyanate and add them to a four-necked flask equipped with a condenser, a thermometer, a stirrer and a constant pressure dropping funnel, and add 5% of the quality of polypropylene glycol Put acetone in a four-necked beaker, place the four-necked flask in a water bath at 85°C, and stir for 2.5 hours at a speed of 750r / min; adjust the temperature to 70°C, and add dilauric acid with 2% polypropylene glycol quality dropwise Dibutyltin, and the mixed solution prepared by mixing dimethylolpropionic acid and 1,4-butanediol at a mass ratio of 1:1 was added to the constant pressure dropping funnel, and dropped at a rate of 0.5mL / s Add it to a four-neck flask, after the dropwise addition, stir at a speed of 450r / min for 2.5h; add triethylamine with 10% of the mass of polypropylene glycol, react for 45min, add deionized water and polypropylene glycol with 1.5 times the mass of polypropylene glycol Et...
example 3
[0025] A kind of water-based polyurethane acrylate water-based paint prepared and the Tieben anticorrosion paint produced by Shanghai Tieben Paint Co., Ltd. are detected, and the specific detection is as follows:
[0026] (1) Determination of water resistance of film:
[0027] Weigh the cut square film (10mm×10mm×1mm), record its mass as W 0 , soak the film in deionized water for 24 hours, take it out, dry the water on the surface of the film with filter paper, and weigh its mass W 1 , and then press to calculate the water absorption rate of the film. Each group of film is tested three times, and the average value is taken.
[0028] Water absorption =(W 1 -W 0 ) / W 0 ×100%
[0029] In the formula:
[0030] W 0 - the mass of the film before water absorption / g;
[0031] W 1 - the mass of the film after water absorption / g.
[0032] (2) Determination of emulsion stability
[0033] Place the prepared emulsion in a centrifuge tube, centrifuge at a speed of 2000r / min for ...
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