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 %.

The invention relates to adhesive, sealant, and/or coating materials comprising a curable composition and the use thereof, the curable composition comprising I. at least one silane-modified polymer obtainable by reacting (A) at least one polymer terminated with amine groups at both ends, which polymer is selected from polyester, polyether polyols, poly(meth)acrylates, polyolefins, and/or copolymers of the aforementioned and has a molecular weight M.sub.w between 250 and 10,000 Dalton, (B) at least one cycloaliphatic diisocyanate compound, and (C) at least one secondary aminosilane with two hydrolysable groups; II. surface treated silica; III. surface treated calcium carbonate; IV. at least one additional aminosilane; V. optionally, at least one adhesion promoter; VI. optionally, at least one pigment; VII. optionally, at least one catalyst; VIII. optionally, at least one plasticizer.