Aqueous polyurethane and preparation method thereof
A water-based polyurethane and prepolymer technology, used in polyurea/polyurethane coatings, leather surface treatment, small raw hides/large raw hides/leather/fur treatments, etc. Use and other issues to achieve good storage stability, good film tensile strength, good film flexibility
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[0026] The invention provides a kind of preparation method of waterborne polyurethane, comprises the following steps:
[0027] a) mixing aliphatic diisocyanate, aliphatic polyol, dimethylol propionic acid and a catalyst to obtain a prepolymer after reaction;
[0028] b) adding a neutralizing agent to the prepolymer obtained in step a), and obtaining an intermediate product after stirring and reacting;
[0029] c) adding water and a chain extender to the intermediate product obtained in the step b), stirring and dispersing to obtain water-based polyurethane, and the chain extender is polyoxyethylene polyamine or polyoxypropylene polyamine.
[0030] The present invention adopts the method of bulk polymerization, no need to use organic solvents, and will not cause environmental pollution; the present invention uses polyoxyethylene polyamine or polyoxypropylene polyamine as chain extender, and uses it for emulsion chain extension, due to polyoxidation The main molecular chain of ...
Embodiment 1
[0077] In a 250mL four-neck flask equipped with a stirrer, a condensing reflux tube, and a thermocouple, add 25 grams of IPDI, 60 grams of PTMEG1000 and 0.01 gram of T12 catalyst, and react at 70° C. for 1 hour to obtain a prepolymer; Heat the polymer to 80°C, add 5.5 g of DMPA to react for 3 hours, then add 0.5 g of BDO to react for 1 hour; cool the obtained reaction solution to 60°C, add 3.4 g of triethylamine, and react for 30 minutes to obtain a mixture; An emulsifying disperser added 170 grams of polyoxypropylene triamine solution containing 2.5 grams of polyoxypropylene triamine solution with a molecular weight of 500 to the mixture under high-speed stirring at 1000 r / min, and dispersed for 30 minutes to obtain a white water-based polyurethane emulsion.
[0078] The polyurethane emulsion was tested according to the above method, and its solid content was 35%, the particle size was 85nm-120nm, the film tensile strength was 18MPa, the elongation at break was 470%, the stora...
Embodiment 2
[0080] In a 250mL four-necked flask equipped with a stirrer, a condensing reflux tube, and a thermocouple, add 29 grams of IPDI, 60 grams of PTMEG600 and 0.01 gram of T12 catalyst, and react at 70° C. for 1 hour to obtain a prepolymer; Heat the polymer to 80°C, add 5.5 g of DMPA to react for 3 hours, then add 0.5 g of BDO to react for 1 hour; cool the obtained reaction solution to 60°C, add 3.4 g of triethylamine, and react for 30 minutes to obtain a mixture; The emulsifying disperser added 180 grams of polyoxypropylene triamine solution containing 2.5 grams of polyoxypropylene triamine solution with a molecular weight of 500 to the mixture under high-speed stirring at 1000 r / min, and dispersed for 30 minutes to obtain a white water-based polyurethane emulsion with blue light.
[0081] The polyurethane emulsion was tested according to the above method, and its solid content was 36%, the particle size was 80nm-100nm, the film tensile strength was 20.1MPa, the elongation at break...
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