| 摘要 |
Producing polyurethane-coated pipe element, comprises (a) mixing an aliphatic polyisocyanate with a compound having at least two isocyanate-reactive hydrogen atoms, a catalyst, and optionally an auxiliary and/or an additive to obtain a first reaction mixture, and (b1) applying the reaction mixture on the pipe element and reacting the reaction mixture to form a polyurethane layer, or (b2) introducing the reaction mixture into a mold, curing to form a molding, removing the molding from the mold, and applying the removed molding on the pipe element. Producing polyurethane-coated pipe element, comprises (a) mixing an aliphatic polyisocyanate with a compound having at least two isocyanate-reactive hydrogen atoms, a catalyst, and optionally an auxiliary and/or an additive to obtain a first reaction mixture, and (b1) applying the reaction mixture on the pipe element and reacting the reaction mixture to form a polyurethane layer, or (b2) introducing the reaction mixture into a mold, curing to form a molding, removing the molding from the mold, and applying the removed molding on the pipe element. The compound having at least two isocyanate-reactive hydrogen atoms is based on an alkoxylation product of an aromatic starter molecule. An independent claim is also included for a polyurethane-coated pipe element obtained by the above method. |
