METHOD FOR PRODUCING COMPOSITE COMPONENTS
A process for the production of composite components comprising the following steps: providing a moulding core; bringing at least one portion of the moulding core into contact with a polyurethane/polyisocyanurate reaction mixture, where at least for some time during the contact a subatmospheric pressure p 1 is applied to at least the exterior of the moulding core. A superatmospheric pressure p 2 is applied to at least the exterior of the moulding core when a time t 1 has expired after beginning of the contact of the moulding core with the polyurethane/polyisocyanurate reaction mixture and/or a temperature T 1 is reached in the polyurethane/polyisocyanurate reaction mixture which makes contact with the moulding core.
1 .- 15 . (canceled)
16 . A process for the production of composite components, comprising the following steps:
providing a moulding core;
bringing at least one portion of the moulding core into contact with a polyurethane/polyisocyanurate reaction mixture, where at least for some time during the contact a subatmospheric pressure p 1 is applied to at least the exterior of the moulding core;
wherein
a superatmospheric pressure p 2 is applied to at least the exterior of the moulding core when
a time t 1 has expired after beginning of the contact of the moulding core with the polyurethane/polyisocyanurate reaction mixture and/or
a temperature T 1 is reached in the polyurethane/polyisocyanurate reaction mixture which makes contact with the moulding core.
17 . The process according to claim 16 , wherein the molar ratio of isocyanate groups to OH groups in the polyurethane/polyisocyanurate reaction mixture is from 1.6 to 6.0.
18 . The process according to claim 16 , wherein the polyurethane/polyisocyanurate reaction mixture comprises a latently reactive trimerization catalyst.
19 . The process according to claim 18 , wherein the trimerization catalyst is a salt of a tertiary amine.
20 . The process according to claim 19 , wherein the tertiary amine is selected from the group consisting of trimethylamine, triethylamine, tripropylamine, tributylamine, dimethylcyclohexylamine, dimethylbenzylamine, dibutylcyclohexylamine, dimethylethanolamine, triethanolamine, diethylethanolamine, ethyldiethanolamine, dimethylisopropanolamine, triisopropanolamine, triethylenediamine, tetramethyl-1,3-butanediamine, N,N,N′,N′-tetramethylethylenediamine, N,N,N′,N′-tetramethylhexane-1,6-diamine, N,N,N′,N′,N″-pentamethyldiethylenetriamine, bis(2-dimethylaminoethoxy)methane, N,N,N′-trimethyl-N′-(2-hydroxyethyl)ethylenediamine, N,N-dimethyl-N′,N′-(2-hydroxyethyl)ethylenediamine, tetramethylguanidine, N-methylpiperidine, N-ethylpiperidine, N-methylmorpholine, N-ethylmorpholine, 1,4-dimethylpiperidine, 1,2,4-trimethylpiperidine, N-(2-dimethylaminoethyl)morpholine, 1-methyl-4-(2-dimethylamino)piperidine, 1,4-diazabicyclo[2.2.2]octane, 1,8-diazabicyclo[5.4.0]undec-7-ene, and 1,5-diazabicyclo[4.3.0]-5-nonane.
21 . The process according to claim 19 , wherein the salt is selected from the group consisting of phenolates, ethylhexanoates, oleates, acetates, and formates.
22 . The process according to claim 16 , wherein the water content of the moulding core is from ≧0.5% by weight to ≦30% by weight.
23 . The process according to claim 16 , wherein a fibre and/or a textile sheet element on the moulding core is brought into contact with the polyurethane/polyisocyanurate reaction mixture.
24 . The process according to claim 16 , wherein the time t 1 is from ≧5 minutes to ≦120 minutes.
25 . The process according to claim 16 , wherein the temperature T 1 is from ≧20° C. to ≦50° C.
26 . The process according to claim 16 , wherein the subatmospheric pressure p 1 is from ≧0.1 mbar to ≦500 mbar.
27 . The process according to claim 16 , wherein the superatmospheric pressure p 2 is from ≧1013 mbar to ≦10 bar.
28 . The process according to claim 16 , wherein the process is carried out in the interior of a closed mould.
29 . The process according to claim 16 , wherein the superatmospheric pressure p 2 is applied by means of a flexible container into which a fluid is introduced.
30 . The process according to claim 16 , wherein the superatmospheric pressure p 2 is applied by means of a flexible container into which a fluid is introduced, and wherein a solid body is located in the interior of the flexible container.