Hydroxypropyl distarch phosphate modified waterborne polyurethane resin and preparation method thereof

The invention provides a hydroxypropyl distarch phosphate modified waterborne polyurethane resin and a preparation method thereof. The hydroxypropyl distarch phosphate modified waterborne polyurethane resin comprises the components in parts by weight: 35.0 to 60.0 parts of diisocyanate, 5.0 to 12.0 parts of polyol, 25.0 to 55.0 parts of polytetrahydrofuran ether glycol, 3.0 to 7.0 parts of dimethylolpropionic acid, 0.01 to 0.1 part of dibutyltin dilaurate, 2.5 to 5.0 parts of ethylenediamine, 2.5 to 4.0 parts of hydroxy propyl distarch phosphate, 0.1 to 0.2 part of distilled water, 1.5 to 3.5 parts of polyvinyl alcohol, 20.0 to 40.0 parts of acetone, 3.0 to 12.0 parts of a neutralizing agent and 120.0 to 260.0 parts of deionized water. According to the prepared hydroxypropyl distarch phosphate modified waterborne polyurethane resin, hydroxy propyl distarch phosphate and polyurethane resin are connected through chemical bonds, the structure is stable, and the performance is lasting; and the hydroxypropyl dista