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

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 terepththalic 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.

1 . A fiber-resin composite material comprising 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 at least one copolyester 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 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 % terephthalic 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 structure 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. 
     
     
         4 - 5 . (canceled) 
     
     
         6 . The fiber structure of  claim 1 , wherein the at least one 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 - 11 . (canceled) 
     
     
         12 . The fiber-resin composite material of claim  10 , wherein the at least one thermosetting resin is an epoxy resin. 
     
     
         13 . (canceled) 
     
     
         14 . 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 (CIA) of at least 185 MPa. 
     
     
         15 . (canceled) 
     
     
         16 . 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.   
     
     
         17 . The fiber-resin composite material of  claim 3 , wherein the at least one statistical copolyester contains 0.05 to 1% by weight of additives. 
     
     
         18 . 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. 
     
     
         19 . 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. 
     
     
         20 . 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 1000 to 3000 Pas. 
     
     
         21 . 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. 
     
     
         22 . 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. 
     
     
         23 . The fiber-resin composite material of  claim 14 , wherein the fiber-resin composite material has a compression after impact in the test of the compression after impact of at least 245 MPa. 
     
     
         24 . The fiber-resin composite material of  claim 23 , wherein the fiber-resin composite material has a strength in the inter-laminar shear strength test of at least 60 MPa, at a measuring temperature of 23° C.