A kind of preparation method of waterborne polyurethane wood coating with antibacterial effect
A water-based polyurethane and wood coating technology, used in polyurea/polyurethane coatings, antifouling/underwater coatings, coatings, etc. and good mechanical properties, good anti-protein adsorption, good anti-microbial adsorption effect
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Embodiment 1
[0025] 1) Preparation of component A:
[0026] Under the protection of dry nitrogen, the polycarbonate diol of 55 parts by weight, the toluene diisocyanate of 21 parts by weight are joined in the grinding mouth four-neck flask that thermometer, stirring device and reflux condenser are equipped with, and steam is heated up to 70°C, then add 400 parts by weight of tetrahydrofuran solvent for mechanical stirring, the stirring speed is 600rpm, stir and react for 1 h; cool down to about 60°C, then add 4.5 parts by weight of dimethylolpropionic acid, and stir for 2h;
[0027] 2) Preparation of component B:
[0028] Take by weighing 6 parts by weight of polycarboxylate betaine methyl methacrylate in a weighing bottle, add 12 parts by weight of mercaptoethylene glycol and 0.25 parts by weight of 2-hydroxyl-2-methylpropiophenone, then add 50 parts by weight Parts of N,N-dimethylformamide, nitrogen gas was passed into the weighing bottle for 0.8 h, sealed, irradiated with ultraviolet l...
Embodiment 2
[0031] 1) Preparation of component A:
[0032] Under the protection of dry nitrogen, the polycarbonate diol of 60 weight parts, the toluene diisocyanate of 18 weight parts are joined in the ground mouth four-neck flask that thermometer, stirring device and reflux condenser are equipped with, and steam is heated up to 75°C, then add 450 parts by weight of tetrahydrofuran solvent for mechanical stirring, the stirring speed is 1200rpm, stir and react for 1.5 h; cool down to about 60°C, then add 5 parts by weight of dimethylolpropionic acid, stir for 2h;
[0033] 2) Preparation of component B:
[0034] Take by weighing 6~9 parts by weight of polycarboxybetaine methyl methacrylate in a weighing bottle, add 12 parts by weight of mercaptoethylene glycol and 2-hydroxyl-2-methylpropiophenone of 0.25 parts by weight, and then add 48 parts by weight of N, N-dimethylformamide, after passing nitrogen into the weighing bottle for 0.9 h, seal it, irradiate it with ultraviolet light for 1.2 ...
Embodiment 3
[0037] 1) Preparation of component A:
[0038] Under the protection of dry nitrogen, the polycarbonate diol of 70 weight parts, the toluene diisocyanate of 15 weight parts are joined in the grinding neck four-neck flask that thermometer, stirring device and reflux condenser are equipped with, and steam is heated up to 80°C, then add 500 parts by weight of tetrahydrofuran solvent for mechanical stirring, the stirring speed is 1500rpm, stir and react for 2 hours; cool down to about 60°C, then add 6 parts by weight of dimethylol propionic acid, and stir for 2 hours;
[0039] 2) Preparation of component B:
[0040] The polycarboxybetaine methyl methacrylate that takes 9 weight parts is in weighing bottle, adds the mercaptoethylene glycol of 13 weight parts and the 2-hydroxyl-2-methylpropiophenone of 0.3 weight part, adds 45 weight parts again Parts of N, N-dimethylformamide, nitrogen into the weighing bottle. After 1h, seal it, irradiate with ultraviolet light for 1.5h, spin and ...
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