Method for preparing carboxylic acid/sulfonic acid mixed waterborne polyurethane with high solid content with solvent-free process

[0024] Embodiment 1: a solvent-free method for preparing a carboxylic acid / sulfonic acid mixed type high-solids waterborne polyurethane, comprising the following steps, and the following parts are in parts by mass:

[0025] 10 parts of polybutylene adipate with a relative molecular weight of 1000, 2 parts of butanediol, 20 parts of isophorone diisocyanate and 0.1 part of organic bismuth catalyst were added to the reaction vessel, and the reaction was carried out at 90 ° C for 2 hours . Then, 1.2 parts of dimethylolpropionic acid was added, and the reaction was carried out at 90° C. for 2 hours. The temperature was lowered to below 60° C., and 0.9 part of triethylamine was added to react for 45 minutes to obtain an ionomer. Next, with vigorous stirring, 44.1 parts of water was added to the ionomer, followed by stirring for 5 minutes. Finally, 2 parts of sodium ethylenediaminoethanesulfonate were added to react for 60 minutes to obtain a carboxylic acid / sulfonic acid mixed wa

[0026] Embodiment 2: a solvent-free method for preparing a carboxylic acid / sulfonic acid mixed type high-solid content waterborne polyurethane, comprising the following steps, and the following parts are in parts by mass:

[0027] 30 parts of polypropylene glycol with a relative molecular weight of 3000, 6 parts of hexamethylene diisocyanate and 0.5 part of organic zinc catalyst were added to the reaction vessel, and the reaction was carried out at 70° C. for 4 hours. Then, 0.3 part of dimethylolpropionic acid was added, and the reaction was carried out at 70°C for 4 hours. The temperature was lowered to below 60° C., and 0.2 part of triethylamine was added to react for 5 minutes to obtain an ionomer. Next, with vigorous stirring, 39.5 parts of water was added to the ionomer, followed by stirring for 3 minutes. Finally, 3 parts of sodium ethylenediaminoethanesulfonate were added to react for 30 minutes to obtain a carboxylic acid / sulfonic acid mixed type waterborne polyureth

[0028] Embodiment 3: a solvent-free method for preparing a carboxylic acid / sulfonic acid mixed type high-solids waterborne polyurethane, comprising the following steps, and the following parts are in parts by mass:

[0029] 30 parts of polytetrahydrofuran ether diol with a relative molecular weight of 1000, 0.3 parts of ethylene glycol, 0.1 part of trimethylolpropane, and 20 parts of toluene diisocyanate were added to the reaction vessel, and the reaction was carried out at 60° C. for 3 hours. Then, 2.5 parts of dimethylolbutyric acid was added, and the reaction was carried out at 60°C for 4 hours. The temperature was lowered to below 60° C., and 2.5 parts of triethanolamine was added to react for 5 minutes to obtain an ionomer. Then, with vigorous stirring, 38.9 parts of water was added to the ionomer, followed by stirring for 1 minute. Finally, 3 parts of sodium ethylenediaminopropanesulfonate were added to react for 5 minutes to obtain a carboxylic acid / sulfonic acid mixe