| 摘要 |
The invention relates to a method for producing polyurethane-polyisocyanurate fiber composite parts, wherein (a) polyisocyanate, (b) a mixture which can be obtained by introducing an alkali or earth alkali metal salt into a compound R-NH-CO-R' containing urethane groups, wherein R is not hydrogen or COR", (c) a compound which contains one or more epoxide groups, (d) polyetherol with an average functionality of 1.8 to 5.0 and a hydroxyl number of 200 to 500, (e) a chain extender, and (f) a fibrous reinforcing agent and optionally additional additives are mixed so as to form a reaction mixture. The reaction mixture is deposited onto the fibrous reinforcing agent and allowed to react into a polyurethane-polyisocyanurate fiber composite part. The content of alkali or earth alkali metal ions per urethane group in the compound (b) is 0.0001 to 3.5 based on the number of the alkali or earth alkali metal ions and urethane groups; the content of the compound (c) containing one or more epoxide groups is 0.3 to 1 wt.% based on the total weight of the components (c) and (d); and the isocyanate index is 200 to 850. The invention further relates to a polyurethane-polyisocyanurate fiber composite part which can be produced using such a method and to the use of such a polyurethane-polyisocyanurate fiber composite part as a body component of vehicles, such as bumpers, fenders, or roof parts, or as structural or semi-structural components for vehicles or wind turbines. |
