Use of layer structures in wind power plants

Patent metadata

Field	Value
Publication number	US-10293586-B2
Application number	US-201013514523-A
Country	US
Kind code	B2
Filing date	Dec 6, 2010
Priority date	Dec 12, 2009
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

The invention relates to the use of layer structures in the production of rotor blades for wind power plants, and to rotor blades for wind power plants.

First claim

The invention claimed is:

1. A process for the production of rotor blades for wind power plants comprising providing a layer structure, wherein the layer structure comprises
a) a release agent layer
b) a fiber layer treated with a polyurethane,
c) a fiber layer provided with the polyurethane

wherein at least one of the treatment of the fiber layer b) and the providing of the fiber layer c) comprises injection of a polyurethane reaction mixture through a vacuum-assisted resin transfer moulding process into a mould comprising the fiber layer b) and the fiber layer c), and wherein the polyurethane reaction mixture has a viscosity of 5000 mPas at 25° C., 30 minutes after a mixing of the polyurethane reaction mixture.

2. Process for the production of rotor blades according to claim 1 for wind power plants, comprising providing rotor blades comprising a casing comprising the layer structure.

3. Process according to claim 2 , wherein the reaction mixture comprises an isocyanate diphenylmethane diisocyanate and/or polyphenylenepolymethylene polyisocyanate having an NCO content of more than 25 wt. %.

4. Process according to claim 2 , wherein the reaction mixture contains a compound having at least two hydrogen atoms reactive towards isocyanate a polyether polyol in which at least 60% of the OH groups are secondary OH groups and which has an OH number of from 200 to 1830 mg KOH/g.

5. Process according to claim 2 , wherein the reaction mixture is applied to the fiber layers at a temperature of from 20 to 80° C.

6. Process according to claim 2 , wherein the reaction mixture is cured at a temperature of from 40 to 160° C.

7. Process according to claim 2 , wherein the reaction mixture has a viscosity of ≤5000 mPas 30 minutes after a mixing of the reaction mixture.

8. The process according to claim 2 , wherein the reaction mixture comprises an isocyanate diphenylmethane diisocyanate and/or polyphenylenepolymethylene polyisocyanate having an NCO content of more than 25 wt. %, wherein the reaction mixture contains as the compound having at least two hydrogen atoms reactive towards isocyanate a polyether polyol in which at least 60% of the OH groups are secondary OH groups and which has an OH number of from 200 to 1830 mg KOH/g, and wherein the reaction mixture has a viscosity of ≤5000 mPas 30 minutes after a mixing of the reaction mixture.

9. The process according to claim 8 , wherein the reaction mixture has a viscosity of ≤2000 mPas 30 minutes after the mixing of the reaction mixture.

Assignees

• Passmann Dirk
• Franken Klaus
• Lindner Stefan
• Covestro Deutschland Ag

Inventors

• Passmann Dirk
• Franken Klaus
• Lindner Stefan

Classifications

• B29D99/0028

  hollow blades · CPC title

• Y02E10/721

  Cross-Sectional Technologies · mapped topic

• B29K2875/00

  Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as mould material · CPC title

• B32B27/40 Primary

  comprising polyurethanes · CPC title

• Y02P70/523

  Cross-Sectional Technologies · mapped topic