| 摘要 |
The invention relates to a coated granular material, wherein the coating comprises a resin, which comprises the reaction product of a polyol component and an isocyanate component and which has been hardened by the addition of a catalyst, wherein the catalyst comprises an amine compound containing hydroxyl groups. The invention further relates to a method for coating a granular material, comprising the steps of (a) providing a granular material; (b) providing a polyol component and an isocyanate component; (c) optionally mixing the polyol component with the isocyanate component; (d) adding the mixture from step (c) or the polyol component and the isocyanate component as individual substances to the provided granular material and producing a coating on the granular material; (e) adding a catalyst in order to harden the coating; (f) optionally repeating steps (d) and (e), wherein the catalyst comprises an amine compound containing hydroxyl groups. |
