Preparation method of fluorine-bearing waterborne polyurethane
A technology of water-based polyurethane and fluoroalcohol, which can be used in biocide-containing paints, antifouling/underwater coatings, coatings, etc., and can solve problems such as poor compatibility between fluorine-containing materials and polyurethane, organic solvent pollution, and uneven distribution , achieve stable and durable hydrophobic and antifouling properties, increase compatibility, and achieve high ecological level
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Embodiment 1
[0024] (1) Preparation of fluorine-containing diols
[0025] Add dimethylolpropionic acid and octafluoropentanol in a molar ratio of 1.2:1 into a reaction flask with a nitrogen protection and stirring device, use toluene as a solvent and a water-carrying agent, and 0.1% by weight concentrated sulfuric acid as a catalyst. After reacting at 110°C for 3 hours, the product was poured into water to remove sulfuric acid and unreacted dimethylolpropionic acid, and the filtrate was decompressed to remove the solvent to obtain a diol with fluorine-containing side groups;
[0026] (2) Preparation of fluorine-containing water-based polyurethane
[0027] The molecular weight after putting into vacuum dehydration in the reactor is 60 parts of 2000 polypropylene glycol, 7.5 parts of isophorone diisocyanate, 7.5 parts of hexamethylene diisocyanate, 5.0 parts of fluorine-containing diol prepared in step (1), 0.16 parts of hindered phenolic antioxidant and 0.01 part of organic bismuth catalys...
Embodiment 2
[0029] (1) Preparation of fluorine-containing diols
[0030] Add dimethylol butyric acid to hexafluoroisopropanol in a molar ratio of 1.2:1 into a reaction flask with a nitrogen protection and stirring device, use toluene as a solvent and a water-carrying agent, and use 0.1% concentrated sulfuric acid as a catalyst by weight to control After reacting at 100-120°C for 3 hours, pour the product into water to remove sulfuric acid and unreacted dimethylol butyric acid, and remove the solvent from the filtrate under reduced pressure to obtain a diol with fluorine-containing side groups;
[0031] (2) Preparation of fluorine-containing water-based polyurethane
[0032] Put 50 parts of polypropylene glycol with a molecular weight of 4000 after vacuum dehydration, 50 parts of polytetrahydrofuran diol with a molecular weight of 2000, 20 parts of isophorone diisocyanate, and 5 parts of 4,4'-diphenylmethane diisocyanate in the reaction kettle. (1) Prepare 10 parts of fluorine-containing ...
Embodiment 3
[0034] (1) Preparation of fluorine-containing diols
[0035] Add tartaric acid and perfluorooctyl alcohol in a molar ratio of 1.2:1 into a reaction flask with nitrogen protection and stirring device, use toluene as solvent and water-carrying agent, 0.1% concentrated sulfuric acid by weight as catalyst, and control the temperature at 100-120°C After reacting for 3 hours, the product was poured into water to remove sulfuric acid and unreacted tartaric acid, and the filtrate was decompressed to remove the solvent to obtain a diol with fluorine-containing side groups;
[0036] (2) Preparation of fluorine-containing water-based polyurethane
[0037]Put 50 parts of polypropylene glycol with a molecular weight of 2000 after vacuum dehydration into the reaction kettle, 30 parts of polycarbonate diol, 20 parts of 4,4'-dicyclohexylmethane diisocyanate, and the fluorine-containing binary resin prepared in step (1). 7.5 parts of alcohol, 0.2 parts of hindered phenolic antioxidant, and 0....
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