Abstract: Provided in the present invention are a hydrophilically modified polyisocyanate, and a preparation method therefor and the use thereof. On the basis of the method provided in the present invention, the problems of a slow reaction rate, and resulting products having a high turbidity and being dark in color in existing sulfonic-acid modified polyisocyanate preparation processes can be effectively and synchronously ameliorated. The method comprises: reacting materials containing a component (a), a component (b) and an optional component (c) to obtain the hydrophilically modified polyisocyanate, wherein (a) is at least one polyisocyanate, (b) is at least one sulfamic acid, and (c) is at least one tertiary amine; and in the sulfamic acid, particles with a particle size of ?900 meshes are less than 10 wt %, preferably less than 5 wt %, and more preferably less than 3 wt %, and particles with a particle size of >40 meshes are less than 10 wt %, preferably less than 5 wt %, and more preferably less than 3 wt %.

Abstract: Disclosed are a sulfonic acid-modified polyisocyanate and a preparation method thereof. By controlling a content of cyclohexylamine component in the raw material, the reaction rate of sulfamic acid and polyisocyanate is accelerated, so that the prepared product has advantages of light color and low turbidity as well as good storage stability.