Polyurethane-polyisocyanurate resins for fiber composite materials with a longer open time
First Claim
1. A process for producing polyurethane-polyisocyanurate-fiber composite parts, whereincomponent (a) polyisocyanate,component (b) a mixture comprising an alkali metal salt or alkaline earth metal salt and a compound comprising urethane groups obtained by reaction of:
- (i) a polyisocyanate selected from the group consisting of 2,2′
-diphenylmethane diisocyanate;
2,4′
-diphenylmethane diisocyanate;
4,4′
-diphenylmethane diisocyanate;
mixtures of monomeric diphenylmethane diisocyanates and polymeric diphenylmethane diisocyanate;
isophorone diisocyanate or its oligomers;
2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, and mixtures thereof;
tetramethylene diisocyanate and its oligomers;
hexamethylene diisocyanate and its oligomers;
naphthylene diisocyanate; and
mixtures thereof, with(ii) a monoalcohol, a dialcohol, or a polyol,component (c) a compound containing one or more epoxide groups, andcomponent (d) a polyetherol having an average functionality of 1.8 to 5.0 and a hydroxyl number of 200 to 500,component (e) a chain extender, andcomponent (f) at least one fibrous reinforcing agentare mixed to form a reaction mixture, the reaction mixture is applied to the at least one fibrous reinforcing agent and caused to react to form the polyurethane-polyisocyanurate-fiber composite part, the amount of alkali metal ions or alkaline earth metal ions per urethane group in the component (b) being 0.0001 to 3.5, based on the number of alkali metal or alkaline earth metal ions and urethane groups, the fraction of the component (c) containing one or more epoxide groups being from 0.3 to 15 wt %, based on the total weight of components (c) and (d), and an isocyanate index being 200 to 850.
2 Assignments
0 Petitions
Accused Products
Abstract
A process is disclosed for producing polyurethane-polyisocyanurate-fiber composite parts, wherein a composition comprising polyisocyanate, a mixture obtainable by introducing an alkali metal salt or alkaline earth metal salt into a compound R—NH—CO—R′ containing urethane groups, with R′ being not hydrogen and/or not COR″, a compound containing one or more epoxide groups, polyetherol having an average functionality of 1.8 to 5.0 and a hydroxyl number of 200 to 500, a chain extender, fibrous reinforcing agents and optionally further additives form a reaction mixture. The reaction mixture is applied to the fibrous reinforcing agent and caused to react to form the polyurethane-polyisocyanurate-fiber composite part. Further disclosed is a polyurethane-polyisocyanurate-fiber composite part producible by such a process, and also the use of a polyurethane-polyisocyanurate-fiber composite part as a bodywork component of vehicles, such as bumpers, fenders or roof parts, or as structural or semistructural components for vehicles or wind turbines.
9 Citations
14 Claims
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1. A process for producing polyurethane-polyisocyanurate-fiber composite parts, wherein
component (a) polyisocyanate, component (b) a mixture comprising an alkali metal salt or alkaline earth metal salt and a compound comprising urethane groups obtained by reaction of: -
(i) a polyisocyanate selected from the group consisting of 2,2′
-diphenylmethane diisocyanate;
2,4′
-diphenylmethane diisocyanate;
4,4′
-diphenylmethane diisocyanate;
mixtures of monomeric diphenylmethane diisocyanates and polymeric diphenylmethane diisocyanate;
isophorone diisocyanate or its oligomers;
2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, and mixtures thereof;
tetramethylene diisocyanate and its oligomers;
hexamethylene diisocyanate and its oligomers;
naphthylene diisocyanate; and
mixtures thereof, with(ii) a monoalcohol, a dialcohol, or a polyol, component (c) a compound containing one or more epoxide groups, and component (d) a polyetherol having an average functionality of 1.8 to 5.0 and a hydroxyl number of 200 to 500, component (e) a chain extender, and component (f) at least one fibrous reinforcing agent are mixed to form a reaction mixture, the reaction mixture is applied to the at least one fibrous reinforcing agent and caused to react to form the polyurethane-polyisocyanurate-fiber composite part, the amount of alkali metal ions or alkaline earth metal ions per urethane group in the component (b) being 0.0001 to 3.5, based on the number of alkali metal or alkaline earth metal ions and urethane groups, the fraction of the component (c) containing one or more epoxide groups being from 0.3 to 15 wt %, based on the total weight of components (c) and (d), and an isocyanate index being 200 to 850. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification