WATER-DISPERSIBLE AMPHOTERIC POLYURETHANE, PREPARATION METHOD THEREFOR, AND USE THEREOF IN REINFORCING CONCRETE

摘要

The present invention relates to a water-dispersible amphoteric polyurethane and a preparation method for it. The water-dispersible amphoteric polyurethane is prepared from polyisocyanate compound, polyol compound, diol compound containing an anionic group or a potential anionic group, tertiary or quaternary amine cationic group compound containing at least two active H functional groups and polyamine compound containing polyoxyethylene. During preparation, the diol compound and tertiary or low-molecular quaternary amine cationic group compound shall be controlled for the dosing order, and then neutralized and chain-extended to finally get the target product. The present invention further relates to the application of the water-dispersible amphoteric polyurethane in reinforced concrete, wherein the dosing amount is 0.1 - 5% of the total mass of the concrete.