Fiber structure, method for its manufacture and use as well as fiber-resin composite material

Patent metadata

Field	Value
Publication number	US-9346943-B2
Application number	US-201313772766-A
Country	US
Kind code	B2
Filing date	Feb 21, 2013
Priority date	Feb 24, 2012
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

The invention relates to a fixed and/or stabilized fiber structure from a fibrous material as well as from an agent for its fixing and stabilizing. The agent for fixing and stabilizing is a statistical copolyester which is formed from the diacid components terephthalic acid and, optionally, isophthalic acid as well as the diol components butanediol, diethylene glycol and triethylene glycol. A method of manufacturing this fiber structure is also provided. The fiber structure is used as a reinforcement material for polymer matrices, in particular epoxy resins. A fiber composite material containing at least one thermosetting resin as well as the fiber structure in accordance with the invention is furthermore provided.

First claim

The invention claimed is:

1. A fiber-resin composite material containing at least one thermosetting resin as well as at least one fixed and/or stabilized fiber structure containing a fibrous material selected from the group consisting of glass fibers, carbon fibers, mineral fibers, synthetic fibers, and mixtures hereof; and
an agent for its fixing and stabilizing,
wherein the agent for fixing and stabilizing is at least one statistical copolyester comprising:
from 55 to 100 mol % terephthalic acid;
from 0 to 45 mol % isophthalic acid;
from 35 to 75 mol % butanediol:
from 15 to 35 mol % diethylene glycol;
from 10 to 30 mol % triethylene glycol,

wherein the sum of the molar fractions of terephthalic acid and butanediol is a maximum of 150 mol % with respect to the total diacid and total diol quantities of 100 mol % each,
wherein the at least one statistical copolyester is present as a fixing thread and has a melting viscosity, measured according to ISO/DIN 1133, at 160° C. and a load of 2.16 kg, in the range of 100 to 3000 Pas, and
wherein the fibrous material is in the form of a unidirectional filament or an areal fibrous material selected from the group consisting of fabrics, fleeces, knitted meshes, knitted fabrics, nonwovens, and combinations thereof.

2. The fiber-resin composite material of claim 1 , wherein the at least one statistical copolyester comprises:
from 70 to 100 mol % terephthalic acid,
from 0 to 30 mol % isophthalic acid;
from 45 to 65 mol % butanediol;
from 20 to 30 mol % diethylene glycol; and
from 15 to 25 mol % triethylene glycol,
wherein the sum of the molar fractions of terephthalic acid and butanediol is a maximum of 150 mol % with respect to the total diacid and total diol quantities of 100 mol % each.

3. The fiber-resin composite material of claim 2 , wherein the at least one statistical copolyester comprises:
from 85 to 100 mol % terephthalic acid,
from 0 to 15 mol % isophthalic acid;
from 47 to 57 mol % butanediol;
from 23 to 28 mol % diethylene glycol; and
from 20 to 25 mol % triethylene glycol.

4. The fiber-resin composite material of claim 1 , wherein the at least one statistical copolyester contains 0 to 2% by weight, of additives, wherein the sum of copolyester and additives equals 100% by weight.

5. The fiber-resin composite material of claim 4 , wherein the at least one statistical copolyester contains 0.05 to 1% by weight of additives.

6. The fiber-resin composite material of claim 1 , wherein the at least one statistical copolyester has a melting point, measured according to ISO 11357 at a heating rate of 20 K/min, in the range of 60 to 160° C.

7. The fiber-resin composite material of claim 6 , wherein the melting point, measured according to ISO 11357 at a heating rate of 20 K/min, is in the range of 90 to 140° C.

8. The fiber-resin composite material of claim 6 , wherein the at least one statistical copolyester has a melting point, measured according to ISO 11357 at a heating rate of 20 K/min, in the range of 70 to 150° C.

9. The fiber-resin composite material of claim 1 , wherein the at least one thermosetting resin is an epoxy resin.

10. The fiber-resin composite material of claim 1 , wherein the fiber-resin composite material has a compression after impact in the test of the compression after impact of at least 185 MPa.

11. The fiber-resin composite material of claim 10 , wherein the fiber-resin composite material has a compression after impact in the test of the compression after impact of at least 245 MPa.

12. The fiber-resin composite material of claim 1 , wherein the melting viscosity, measured according to ISO/DIN 1133, at 160° C. and a load of 2.16 kg is in the range of 100 to 600 Pas.

13. The fiber-resin composite material of claim 1 , wherein the melting viscosity, measured according to ISO/DIN 1133, at 160° C. and a load of 2.16 kg is in the range of 150 to 300 Pas.

14. The fiber-resin composite material of claim 1 , wherein the melting viscosity, measured according to ISO/DIN 1133, at 160° C. and a load of 2.16 kg is in the range of 1500 to 2500 Pas.

15. The fiber-resin composite material of claim 1 , wherein the melting viscosity, measured according to ISO/DIN 1133, at 160° C. and a load of 2.16 kg is in the range of 1700 to 2200 Pas.

16. The fiber-resin composite material of claim 1 , wherein the fiber-resin composite material has a strength in the interlaminar shear strength test of at least 55 MPa, at a measuring temperature of 23° C.

Assignees

• Ems Patent Ag

Inventors

• Hoppe Ralf

Classifications

• D01F6/86

  from polyetheresters · CPC title

• D04H1/4218

  Glass fibres · CPC title

• D04H1/587

  characterised by the bonding agents used · CPC title

• D06M17/04

  by applying synthetic resins as adhesives · CPC title

• C08K7/02 Primary

  Fibres or whiskers · CPC title