Waterborne polyurethane leather finishing agent with antifouling factor and preparation method of waterborne polyurethane leather finishing agent
A water-based polyurethane and leather finishing agent technology, which is used in antifouling/underwater coatings, polyurea/polyurethane coatings, leather surface treatment, etc., and can solve problems affecting life cycle, human health, biofouling, etc.
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Embodiment 1
[0019] The preparation of the small molecule chain extender with anti-fouling performance, the specific operation method is as follows: Weigh 5.00 g of diaminoethyl methacrylate in a weighing bottle, add 6.87 g of mercaptopropylene glycol and 0.1187 g of photoinitiator benzoin dimethyl ether, add 20ml of distilled and purified tetrahydrofuran was passed into the weighing bottle with nitrogen gas for 0.5h, and then sealed. UV light was irradiated for 1 h, the solvent was removed by rotary concentration, the reaction product was precipitated twice in n-hexane, and vacuum-dried for 24 h to obtain a small molecule chain extender with antifouling properties.
[0020] Weigh 30.00 g polycarbonate diol (M n =2000) into the reactor, add 6.96 g of toluene diisocyanate and 300 ml of tetrahydrofuran solvent into the reactor, stir mechanically under the protection of nitrogen, and react at 60 °C for 30 min. Add 1.5g of dimethylol propionic acid, stir and catalyze the reaction at 80°C for ...
Embodiment 2
[0022] The preparation of the small molecule chain extender with anti-fouling performance, the specific operation method is as follows: Weigh 5.00 g of diaminoethyl methacrylate in a weighing bottle, add 6.87 g of mercaptopropylene glycol and 0.1187 g of photoinitiator benzoin dimethyl ether, add 20ml of distilled and purified tetrahydrofuran was passed into the weighing bottle with nitrogen gas for 0.5h, and then sealed. UV light was irradiated for 1 h, the solvent was removed by rotary concentration, the reaction product was precipitated twice in n-hexane, and vacuum-dried for 24 h to obtain a small molecule chain extender with antifouling properties.
[0023] Weigh 30.00 g polytetrahydrofuran ether (M n =2000) into a 500ml three-necked flask, vacuum dehydrated for 2h, and the temperature was lowered to 60°C, 10.08g of diphenylmethane diisocyanate was added, 300ml of tetrahydrofuran solvent was added, mechanically stirred under nitrogen protection, and reacted at 60°C for 30...
Embodiment 3
[0025] The preparation of the small molecule chain extender with antifouling properties, the specific operation method is as follows: Weigh 10.00 g diaminoethyl methacrylate in a weighing bottle, add 12 g mercaptopropylene glycol and photoinitiator 2-hydroxyl-2-methylbenzene Add 0.2 g of acetone, add 20 ml of distilled and purified tetrahydrofuran, blow nitrogen into the weighing bottle for 0.5 h, and seal it. UV light was irradiated for 1 h, the solvent was removed by rotary concentration, the reaction product was precipitated twice in n-hexane, and vacuum-dried for 24 h to obtain a small molecule chain extender with antifouling properties.
[0026] Weigh 30.00 g polytetrahydrofuran (M n =2000), added to a 500ml three-necked flask, vacuum dehydrated for 2h, added 6.72g of hexamethylene diisocyanate (dissolved in THF), added 300ml of THF, stirred mechanically under nitrogen protection, and reacted at 60°C for 30min. Add 2g of dimethylolbutyric acid, and stir the reaction at 8...
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