| 摘要 |
<p>Solvent-containing polyisocyanate mixture (I) comprises: (a) tolylene diisocyanate (TDI) component comprising TDI isocyanurate polyisocyanates; (b) aliphatic and/or cycloaliphatic isocyanate component comprising aliphatic and/or cycloaliphatic polyisocyanates; and the reaction product of at least one of components (a) and/or (b) with (c) at least one polyether polyol having a number-average molecular weight of 500-4000 g/mol that contains at least one tertiary nitrogen atom; and (d) optionally at least one polyether polyol that does not contain nitrogen atoms. Solvent-containing polyisocyanate mixture (I) having a solvent content of less than 50 wt. % at a runout viscosity at 23[deg] C of 20 s, an isocyanate groups (NCO) content of 7-15 wt. %, a content of monomeric TDI of less than 0.2 wt. %, and a content of monomeric aliphatic and/or cycloaliphatic isocyanates of less than 0.2 wt. %, where the mixture comprises: (a) TDI component comprising TDI isocyanurate polyisocyanates; (b) aliphatic and/or cycloaliphatic isocyanate component comprising aliphatic and/or cycloaliphatic polyisocyanates; and the reaction product of at least one of components (a) and/or (b) with (c) at least one polyether polyol having a number-average molecular weight of 500-4000 g/mol that contains at least one tertiary nitrogen atom; and (d) optionally at least one polyether polyol that does not contain nitrogen atoms. Independent claims are included for: (1) preparing (I), where the prepolymer mixture of (a) and (b) is prepared by reacting at least one of the two components (a) and/or (b) with (c) and (d) in the presence of organic solvents; (2) a coating comprising (I), a catalyst that accelerates the reaction of free NCO groups with moisture, and one or more auxiliary substances and additives; and (3) a substrate coated with a coating comprising (I).</p> |
