WO2018028791A1

WO2018028791A1 - Method for producing a fibre matrix semi-finished product

Info

Publication number: WO2018028791A1
Application number: PCT/EP2016/069148
Authority: WO
Inventors: Alois Profeta Da Silva
Original assignee: LIEMT, Rainer
Priority date: 2016-08-11
Filing date: 2016-08-11
Publication date: 2018-02-15

Abstract

The invention relates to a method for producing a fibre matrix semi-finished product, wherein the fibre matrix semi-finished product comprises a matrix and a plurality of inserts with a respective fibrous surface and a respective core. The method comprises the following steps: A) providing the inserts such that the fibrous surface of each insert is in contact with the fibrous surface of at least another of the inserts via at least one fibre, and each of the inserts is connected to each of the other inserts, optionally via one or more of the other inserts, whereby a cross-linking is obtained; and B) bringing into contact the cross-linking and the matrix, after which a portion of the matrix remains adhered to a plurality of the fibrous surfaces, whereby the fibre matrix semi-finished product is obtained. The invention also relates to a method for producing a moulded part from a fibre composite material. The methods according to the invention can preferably be used in land vehicle construction, in particular in road vehicle construction.

Description

Process for producing a fiber-matrix semi-finished product

The present invention relates to the technical field of fiber composites and relates to a method for producing a fiber-matrix semifinished product or a Faserver ^¬ composite material.

Under fiber-matrix semi-finished products are semifinished products made of reinforcing fibers, which are impregnated with a plastic matrix ver ^¬ stood. There are typically thermoset or thermoplastic polymers as a matrix, is set ^¬ in the form of a resin. Reinforcing fibers are usually glass fibers or carbon fibers. So-called prepregs are their most well-known representatives, these are usually a semi-finished product made of continuous fibers. Usually, the continuous fibers are used in the form of mats, fabrics or knitted fabrics. Other known forms of thermoset matrix fiber-matrix semi-finished products include Sheet Molding Compound (SMC) and Bulk Molding Compound (BMC). In addition, fiber-matrix semi-finished products with ther ^¬ moplastischer matrix in the prior art are known.

From fiber-matrix semi-finished products, fiber composites can be produced, inter alia, by pressure and curing, which often have to be present in a ^specific form (ie as a molded part).

A particular feature of many fiber-matrix semi-finished products is that they are provided in their form as fiber-matrix semi-finished products for the end user, and e.g. can be stored for a long time. As a result, the final production is usually simplified or reduced costs.

A major field of application for fiber composites is the au ^¬ tomobilindustrie (or generally the manufacturing industry for land vehicles or road vehicles) because the automobile Indus ^¬ ration has the tendency to reduce vehicle weight in order to produce more fuel-efficient vehicles. Nevertheless, the company ^¬ server composite material will naturally meet high requirements in terms of its strength.

WO 2008/046392 A1 discloses a method for producing a load-bearing space lattice structure.

WO 99/06200 AI discloses a method of Cell or wood pulp existing moldings with cavities, but also no method for producing a fiber matrix semifinished product.

However, many of the processes known in the art are comparatively complicated and expensive to carry out.

An object of the present invention is now to provide a process for producing a fiber-matrix semifinished product available that is cost effective and nevertheless a comparatively ^¬ as high strength when obtained from the fiber-matrix semifinished ^¬ Lich fiber composite material allows. Another object is to provide a method for producing a molded part from a fiber composite material, which is also inexpensive at relatively high strength of Faserver ^¬ composite material.

Therefore, the present invention relates to a method for producing a fiber-matrix semifinished product, wherein the fiber-matrix semifinished product comprises a matrix and a plurality of inserts each having a fibrous surface (for example glass fiber). The method comprises the following steps A and B:

A) providing the inserts so that the fibrous surface of each of the inserts is over at least one ^fiber , preferably at least 10, more preferably at least 20, even more preferably at least 50, especially at least 100, with the fibrous surface of at least one other of Inlay is in contact and each of the inserts is associated with each other of the inserts, preferably wherein the fa ^¬ serige surface of each of the inserts with the fibrous surface of each other of the inserts, optionally via one or more of the other inserts in combination , whereby crosslinking is obtained.

Preferably, the crosslinking is made by laying fiber strands or fiber ribbons between the inserts during manufacture of the inserts (see Example 1).

B) contacting the crosslinking with the matrix, in particular impregnating the crosslinking in the matrix, after which a portion of the matrix remains adhered to a plurality, preferably all, of the fibrous surfaces, whereby the fiber Matrix semi-finished product is obtained.

For example, the mesh is sprayed immediately prior to insertion into the mold through nozzles in the laying head of a matrix inserter. In another preferred embodiment, the cross-linking is contacted with a matrix of epoxy resin and auxiliary materials (hardener, etc.) (e.g., by soaking or spraying) suitable for obtaining a prepreg fiber matrix semifinished product. Preferably, this is stored with cooling to slow the curing.

The method of the present invention is further characterized in that each of the inserts has a core. The core is solid, liquid or gaseous, or has ^¬ component parts in selected of these conditions on (eg hard-gas, such as a foam). The core is preferably gefer ^¬ manufactured from plastic or metal, with or without gas inclusions, preferably with gas inclusions, more preferably of a foam, particularly a rigid foam such as a polyurethane foam. The degree of porosity of the foam can be used to regulate the extent to which the matrix penetrates into the core. Usually no penetration of the matrix is desired in the core, because so the density of the fiber composite material would be increased, which could be disadvantageous for example for lightweight construction. Advantageously, inserts are combined with various types of networking cores in order to achieve for example a hö ^¬ here strength at lower cost.

By providing the inventive crosslinking of inserts a high strength can be achieved in the further processing to the fiber composite material, at the same time he ^¬ inventive method is relatively simple and ^{kostengüns ¬ term} .

The strength is advantageously increased even further by the crosslinking essentially constituting a structured lattice, in particular a Cartesian lattice, wherein each of the inserts essentially corresponds to one cell of the lattice. These cells are preferably polyhedral, especially regular polyhedral. The term "substantially" in these two contexts means that 1. the crosslinking is up to 50%, preferably up to 40%, more preferably up to 30%, even more preferred may vary up to 20%, in particular up to 10% of the grid (preferably measured by the average deviate ^¬ monitoring the volumetric center of gravity of the insert part from the volume ^¬ focus of the corresponding ideal lattice cell in relation to the volume equivalent sphere radius of the respective grid cell is expressed in percentage) and 2. the insert the corresponding grid cell only at least 50%, preferably at least 60%, more filled preferably at least 70%, even more be ^¬ vorzugt at least 80%, especially at least 90% - of the remainder of the grid cell volume is preferably filled in by the matrix.

The shape of the inserts determines the geometry of the cells. For example, the inserts (and hence the cells) may be octahedron stumps as disclosed in WO 2008/046392 Al. However, the inserts, for example, may be bulletproof ^¬ shaped or ellipsoidal, the corresponding grating cell is still to be regarded as polyhedron that approximates the spherical shape or elliptical shape (eg spherical inserts as a dodecahedron or icosahedron and ellipsoidal inserts as octahedrons, such as in WO 2008/046392 Al discloses).

In a further preferred embodiment, the inserts of the semifinished product are lined up in chain form ("single strips"), as a result of which they can be laid more easily by machine.

A further preferred embodiment of the invention ^shown SEN method refers to a method for producing a molded article of a fiber composite material using the method according to the invention for producing a fiber-matrix semifinished product. This method comprises the following Schrit ^¬ te:

C) inserting the obtained from the inventive method for producing a fiber-matrix semi-finished fiber-matrix semifinished product in a mold.

This can be done by a loading device. An advantage over methods of the prior art is that the strength of the molding - in case of variation of the inserts (in the core and / or fibrous surface) of the fiber-matrix semifinished product - can be regulated ört ^¬ Lich by a particular sequence at the Loading is complied with. For example, a local Re ^¬ gulation of the resistance may be desired in the B-pillar of vehicles in order to control the deformation in traffic accidents.

D) exerting pressure on the fiber-matrix semifinished product in the mold so that the fiber-matrix semifinished product becomes substantially form- ^fitting . The core of the insert preferably contains substances that can be excited by a change in the environmental conditions for gas formation, as disclosed for example in WO 99/06200 Al. As a result, pressure can also be exerted by the interior of the semifinished product or the inserts.

E) curing of the fiber-matrix semifinished product, whereby the molded part is formed from the fiber composite material. The curing can be carried out in ^¬ example by (previously done) addition of hardener or by heating.

In a further preferred embodiment, a portion of the cores of the inserts comprises ferromagnetic material, where ^¬ heated by induction, the fiber-matrix semifinished product and allows the curing or is favored. In particular, a local pre-curing can be achieved by local placement of ferromagnetic material umfas ^¬ send cores.

In a further preferred embodiment, the cores, the matrix, and / or the fibrous surfaces in the fiber matrix semifinished product vary in such a way that multi-stage curing is possible.

Preferably, this method further comprises sucking or draining the excess matrix. In a particularly preferred embodiment, the grid and / or the cross-linking as described above remains substantially after curing.

In a further preferred embodiment of the present invention, the matrix does not come with the respective core of X% of the inserts come into contact, wherein X is more than 30, be ^¬ vorzugt be ^¬ vorzugt more than 50, more preferably greater than 75, even more more than 90, in particular more than 95. As a result, for example, the strength is increased because the - possibly lower strength cores - are less affected by any force.

In a further preferred embodiment of the present The invention consists of the crosslinking of at least two, preferably at least three, more preferably at least four, in particular at least five, layers of said inserts. This increases the strength of the fiber composite material to be obtained inter alia by stronger cross-linking of the fibers.

In a further preferred embodiment of the present invention, said plurality of inserts is at least 5, preferably at least 10, more preferably at least 20, even more preferably at least 30, in particular at least 40. This increases the strength of the fiber composite ^¬ material to be obtained, inter alia, by stronger cross-linking of the fibers.

In a further preferred embodiment of the present invention, at least 100, preferably at least 250, more preferably at least 500, even more preferably at least 750, in particular at least 1000, of the inserts per cubic meter of crosslinking are present in the crosslinking. This increases the strength of the fiber composite to be obtained, among others. through stronger networking of the fibers.

In a further preferred embodiment of the present invention, in the fiber composite material at least 100, preferably at least 250, more preferably at least 500, even more preferably at least 750, especially at least 1000 of the Einle ^¬ geteile per cubic meter of the fiber composite material present. This increases the strength of the receivable fiber composite material ^¬ inter alia by increasing crosslinking of the fibers.

In a further preferred embodiment, the matrix is a thermosetting matrix, preferably comprising, more preferably consisting of a synthetic resin (in particular an epoxy resin).

In a further preferred embodiment, the matrix is a thermoplastic matrix, preferably comprising more before Trains t ^¬ consisting of, polyether or polypropylene.

Preferably, the fiber matrix semifinished product obtainable from the process according to the invention is a prepreg.

In a further preferred embodiment, the provision of the inserts in a network (step A) comprises the following steps:

Half-molds, each one half in shape will be provided.

The first part of the half-molds (half-mold arrangement I) is arranged essentially in the form of a grid corresponding to the Cartesian grid, which is to represent the crosslinking later.

Irrespective of this, the second part of the half-molds (half-mold arrangement II) is arranged essentially in the form of a grid corresponding to the Cartesian grid, which is to represent the crosslinking later.

Preferably, the half-mold assemblies are sprayed with water (the water assists the adhesion of the fibers to the walls of the half-molds)

In the half-mold arrangement I and II is independently fibrous fabric, -gelege, -vlies or -matte introduced where ^¬ is preferably provided individually for each half-mold. (If, in half-mold arrangement I and II are each a continuous fiber fabric laid fabric, non-woven material or mat is introduced, the insert parts are finally of two continuous surfaces. Nevertheless, these are a plurality of independent inserts, because multiple cores independently of one ^¬ other are enclosed)

If the fibrous web, scrim, mat or mat is provided individually for each half-mold in the previous step, a fiber strand or ribbon is laid between the half-forms of the half-mold assembly I or II. (to finally get connected)

The cores are placed in the half-molds of the half-mold assembly I, on the fiber fabrics, scrims, fleece or mat.

-The half mold assembly II is positively placed on the half-mold assembly ^¬ I.

-The fiber fabric, laid fabric, non-woven material or mat of the half-molds ^¬ arrangement I are where so attached to the half-mold assembly, the cores are enclosed.

Particularly preferred is the use of the method according to the invention in or for land vehicle construction, in particular in or for road vehicle construction. In a further aspect, the present invention relates to a molded part made of a fiber composite material obtainable from the method according to the invention.

In a further aspect, the present invention relates to a fiber-matrix semifinished product obtainable from the process according to the invention.

The strength (also called breaking stress) is a parameter that characterizes the resistance behavior of the material against elastic or plastic deformation. The obtainable from the process of this invention composite fiber material has a comparatively high strength at comparatively ^¬ as low manufacturing costs, whereby the strength is preferably selected from tensile strength, compressive strength, compressive strength, flexural strength, torsional strength and shear strength.

The crosslinking according to the present invention can ensure the transmission of forces from surface to surface. The inserts can be networked by machines or machines or later inserted as a fiber-matrix semi-finished product in the mold. The core of the insert part may include substances that chemically react with the play ^¬ during the curing and for example, affect the curing process. In addition, the core may contain gases or metals to influence reactions such as the curing process. The surface of the inserts and / or the inner surface may be printed with wide ^¬ ren substances or impregnated, for meadow to reactions such as the curing to beeinflus ^¬ sen. The cores and / or inserts can be created using 3D printing. Various inserts can be combined to Errei ^¬ chen certain effects. The cores may have bearing properties or be conductive, or may not function after completion. The individual inserts can be equipped with a unique identification number to prevent eg theft or sabotage or for counterfeit security. After use of the molding, the cores can be reused.

The present invention can be used in vehicle construction, caravan construction, shipbuilding, aircraft construction as well as in the entire plastics industry. technology (eg packaging technology). The present invention can also be used in structural work, building construction, prefabricated construction, construction, interior work, for sound or heat protection, for interior fittings, furniture, for doors and door panels or decorations. Also, the moldings may have some flexibility, for example by providing rubber-like inserts or viscous cores. In particular, it is possible with the present invention to form any three-dimensional structures, wherein the structures formed by the present invention have properties that occur in biological growth, such as the cells of an organ. The inserts may also include for fiber-matrix semi-finished material is untypi ^¬ rule, such as concrete, metal, etc. With the present invention, a three-dimensional structural analysis can be achieved. The inserts may also include sintered Materali ^¬ s. The inserts may also be in the form of quadrangular truncated pyramids or triangular truncated pyramids.

Here is to be understood by fiber-matrix semi-finished each semifinished product of reinforcing fibers, which is impregnated with a plastic matrix - regardless of how long the fiber matrix semifinished can be stored without fully aushär ^¬ th. Preferably, the fiber Matrix semifinished product of the invention at least one day, preferably at least one week, more preferably ^¬ at least two weeks, even more preferably at least one month, in particular at least two months storable, before ^¬ it 50% of the final hardness, preferably 75% of the final hardness, more before ^¬ Trains t reaches 90% of the final hardness, more preferably 95% of the final hardness, in particular 99% of the final hardness. In a particularly be ^¬ vorzugten embodiment of the invention fiber-matrix semi-finished products is a prepreg. In particular, a better storable ^¬ ability is achieved by cooling to below 0 ° C, preferably below -10 ° C, more preferably below -15 ° C, especially below -20 ° C.

Here, "in contact to be on at least one fiber" in reference to a first fibrous surface and a second fa ^¬ serige surface such that the fiber ( "linking fiber") at ^¬ least one further fiber of the first surface and another fiber of the second Surface touched. Advantageously, the linking fiber is so with the first fibrous surface and the second fibrous surface, when force is applied (eg, by deforming forces), allows force to be transmitted from the first fibrous surface to the second fibrous surface via the linking fiber.

As used herein, "in connection" (with respect to the inserts) means that a first and a second insert (each having a fibrous surface) communicate with each other when the first insert is in contact with the second insert (see the previous paragraph for defining "In contact") and / or when the first insert is in contact with another insert ^¬ part, which in turn (possibly via other Einlegteile) with the second insert in contact. Before ^¬ geous legally obtained from the "in communication" means that when force is applied a force ^¬ transmission of the fibrous surface of the first Einlegteils to the fibrous surface of the second insert at least one fiber is made possible (for example by deforming forces) over.

The present invention particularly relates to the nachfol ^¬ constricting preferred embodiments:

Embodiment 1. Method for producing a fiber-matrix semifinished product, wherein the fiber-matrix semifinished product comprises a matrix and a plurality of inserts, each with a fibrous surface,

characterized in that the method comprises the following Schrit ^¬ te:

A) so that the faseri ^¬ ge surface of each of the inserts on at least one fiber with the fibrous surface is the provision of the inserts at least one other of the inserts in contact and each of the inserts with each other of the inserts, gegebe ^¬ appropriate, via one or several of the other Einlegetei ^¬ le, is in communication, whereby a Einlegeteilanordnung (or networking) is obtained, and

B) contacting the insert assembly (or

Crosslinking) with the matrix, after which a portion of the matrix at a plurality, preferably at all, of the fibrous surface is arrested, thereby obtaining the fiber-matrix ^semi-¬ imaging; wherein each of the inserts having a core, the core being preferably made of plastic or metal, is optionally generated with gas inlet ^¬ circuits,

preferably wherein the matrix does not come into contact with the respective core of X% of the inserts, wherein X is more than 30, preferably ^¬ more than 50, more preferably more than 75, even more preferably ^¬ more than 90, in particular more than 95 is and

Preferably, wherein step A) comprises the following steps: al) providing half-molds which correspond in shape each half insert, and

a2) arranging a first part of the half-molds, and

a3) arranging a second part of the half forms, and

a4) the introduction of fiber fabric, scrim, fleece or mat in the first and second part of the half-molds, and

a5) the introduction of the cores into the first part of the half forms, and

a6) the positive placement of the second part of the Halbfor ^¬ men on the first part of the half-forms, and

al) attaching fiber fabric, laid fabric, non-woven material or mat of the first part of the half-molds of fiber fabric, laid fabric, non-woven material or mat of the second part of the half-molds so that the inserted ^¬ brought cores are enclosed.

Embodiment 2. A method for producing a molding made of a fiber composite material using the method ge ^¬ Mäss embodiment 1, characterized in that the method comprises the steps of:

C) placing the fiber matrix semifinished product obtained from the process according to embodiment 1 into a mold,

D) applying pressure to the fiber-matrix semifinished product in the mold so that the fiber-matrix semifinished product becomes substantially positive, and

E) curing of the fiber-matrix semifinished product, whereby the ^molded part ^¬ arises from the fiber composite material;

preferably further comprising aspirating or draining the excess matrix. Embodiment 3. Method according to one of the preceding embodiments 1-2, characterized in that the insert part arrangement (or cross-linking) is substantially one

structured grid, in particular a Cartesian grid, wherein each of the inserts substantially corresponds to a cell of the grid.

Embodiment 4. A method according to one of the foregoing embodiments 1-3, characterized in that the inlaid part assembly (or crosslinking) of at least two, preferably at least three, more preferably at least four, in particular to ^¬ least five layers of said inserts is ,

Embodiment 5. Method according to one of the preceding embodiments 1-4, characterized in that said plurality of inserts is at least 5, preferably at least 10, more preferably at least 20, even more preferably at least 30, especially at least 40.

Embodiment 6. Method according to one of the preceding embodiments 1-5, characterized in that in the insert part arrangement (or crosslinking) at least 100, preferably

at least 250, more preferably at least 500, even more preferably at least 750, in particular at least 1000 of the inserts per cubic meter of the insert assembly (or networking) are present.

Embodiment 7. Method according to one of the preceding embodiments 1-6, characterized in that in the fiber composite material at least 100, preferably at least 250, more preferably at least 500, even more preferably at least 750, in ^¬ particular at least 1000 of the inserts per cubic meter of Fa ^¬ serverbundwerkstoffs are present.

Embodiment 8. Method according to one of the preceding embodiments 1-7, characterized in that the matrix is a duroplastic matrix, preferably comprising, more preferably consisting of, a synthetic resin, in particular an epoxy resin.

Embodiment 9. Process according to one of the preceding embodiments 1-8, characterized in that the fiber matrix semifinished product after step B), and optionally before step C), to below 0 ° C, preferably below -10 ° C, more preferably below -15 ° C, in particular below -20 ° C is cooled. Embodiment 10. The method according to any one of embodiments 1-7, characterized in that the matrix is a thermoplasti ^¬ specific matrix, preferably comprising, in particular consisting of, polyether or polypropylene.

Embodiment 11. Method according to one of the preceding embodiments 1-10, characterized in that the fiber matrix semifinished product is a prepreg.

Embodiment 12. Use of the method according to one of the preceding embodiments 1-11 in land vehicle construction, in particular in road vehicle construction.

Embodiment 13. A molded article made of a fiber composite material obtainable from the method according to one of the preceding embodiments 1-12.

Embodiment 14. Fiber-matrix semifinished product obtainable from the method according to one of the embodiments 1, 3-6 and 8-11.

The present invention is illustrated by the following Figu ^¬ ren and examples to which it is of course not limited ^¬ closer.

FIG. 1: Production of the fiber semifinished product

A) The half-molds (1) of the half-mold assembly I (2) are sprayed with release agent from a spray bottle (10).

B) The half-forms of the half-mold assembly I are sprayed with water from a spray bottle (11).

C) The punched-out glass fiber fleece pieces (3) are introduced into the half-forms of the half-mold arrangement I.

D) Tapes of glass fiber fleece (4) are placed on the glass fiber fleece pieces of the half-mold assemblies I corresponding to the grid.

E) The glass fiber fleece pieces are sprayed with one-component polyurethane mounting foam (5).

F) The half- ^mold arrangement II (6) treated as in steps AC is placed on the half-mold arrangement I in a form-fitting manner. The result is the networking of the inserts made of glass fiber fleece with foam core - the fiber semi-finished product. The stacked half-mold assemblies I and II were removed from the fiber semi-finished product.

FIG. 2: a photograph of the fiber semifinished product from the individual inserts len

Figure 3: molded part of the fiber matrix half ^¬ invention zeug

Example 1 - Production of a Fiber Matrix Semifinished Product

Each of the inserts 25 should be finished in Wesent ^¬ union ellipsoidal shape (in approximately the form of a bi-convex lens in accordance). Accordingly, 50 half-molds, each corresponding to half an insert in shape, were made of cast resin.

The first 25 of the half-forms (half-mold arrangement I) were arranged in a plane, substantially in the form of a square grid (5x5 half-forms) corresponding to the Cartesian grid, which is to represent the cross-linking later, with the opening facing upwards. Independently, the second 25 of the half-forms (half-mold arrangement II) were also arranged with the opening upwards in a grid corresponding to the grid of half-mold arrangement I (5 × 5 half-forms).

The half-molds of the half-mold assemblies I and II were coated with release agent and then sprayed with 5 ° C cold water. In each half-mold, a glass fiber fleece piece (160 g / m ² ) obtained by punching was introduced in each case, which was supported by the moistening applied to the respective half-mold and even became moist.

10 tapes made of glass fiber fleece with a width of 3 mm WUR ^{¬ placed} on the glass fiber fleece pieces of the half-mold assemblies I corresponding to the square 5x5 grid. Likewise, it was, independently, proceeded with half-mold II.

The glass fiber fleece pieces in the half-forms of the half-mold assemblies I were sprayed with one-component polyurethane mounting foam (HANNO 48 gun foam, dimensional stability according to DIN 53431: +/- 5%, compressive strength at 10% compression according to DIN 53421: 5-7 N / cm ² ).

The half-mold assembly II was reversed so that the voltage of the half-molds Publ ^¬ pointed down and the half-mold assembly II of the half-mold assembly I was thus opposite. Due to the moisture in the glass fiber fleece pieces or through Contact with the glass fiber nonwoven pieces of dampened glass fiber nonwoven tapes left both pieces and tapes in the half molds.

The half-mold arrangement II was positively placed on the half ^{¬ form} arrangement I.

After 30 minutes of curing of the mounting foam at room temperature Tempe ^¬ (locally increased humidity by moisture of the glass fiber nonwoven curing recipient) so did the cross-linking of the 25 inserts made of glass fiber nonwoven with foam material core ^¬ - the fiber semi-finished product. The stacked half-mold assemblies I and II were removed from the fiber semi-finished product.

The method just described is also illustrated by FIG.

By the previously inserted strips of glass fiber fleece, each of the 25 insertion parts fibrous the (glass) surface was at ^¬ least one other of the inserts in contact (not marginal insertion parts were each having four adjacent inserts in contact) and each of the 25 insertion parts was with each other the Einlegteile in conjunction, optionally over one or more other inserts.

The semifinished fiber product was soaked in the matrix (epoxy resin EPOTUF® 37-127 with hardener EPOTUF® 37-601). The fibrous upper ^¬ faces of the inserts were now almost completely covered with matrix, but these do not penetrated into the cores of the inserts. Thus, the fiber-matrix semifinished product was obtained from the erfindungsge ^¬ MAESSEN method.

Example 2 - Production of a molded part from a fiber composite material

The obtained from Example 1 fiber-matrix semi-finished products was processed further to ^¬ continuous. The fiber-matrix semifinished product was introduced into a mold. The mold was closed and placed under Va ^¬ uum to evacuate the excess resin. After curing for 24 hours at room temperature, the molding was obtained from the process according to the invention.

Claims

claims

1. A method for producing a fiber-matrix semifinished product, wherein the fiber-matrix semifinished product comprises a matrix and a plurality of A ^¬ lay share each with a fibrous surface,

characterized in that the method comprises the following Schrit ^¬ te:

A) so that the faseri ^¬ ge surface of each of the inserts on at least one fiber with the fibrous surface is the provision of the inserts at least one other of the inserts in contact and each of the inserts with each other of the inserts, gegebe ^¬ appropriate, via one or several of the other Einlegete ^¬ le, is in communication, whereby a cross-linking is obtained, and

B) contacting the crosslinking with the matrix, after which a portion of the matrix remains adhered to a plurality, preferably all, of the fibrous surfaces, thereby obtaining the fiber matrix semifinished product; wherein each of the inserts has a core.

2. A method for producing a molded part from a fiber composite material using the method according to claim 1, characterized in that the method comprises the following steps:

C) inserting the fiber matrix semifinished product obtained from the process according to claim 1 into a mold,

E) curing of the fiber-matrix semifinished product, whereby the ^molded part ^¬ arises from the fiber composite material; preferably also suctioning or draining off the excess comprising sweeping matrix.

3. The method according to any one of the preceding claims, characterized in that the crosslinking is substantially a struktu ^¬- oriented grid, in particular a Cartesian grid, wherein each of the inserts substantially corresponds to a cell of the grid.

4. The method according to any one of the preceding claims, characterized in that the matrix does not come into contact with the respective core of X% of the inserts, wherein X more than 30, preferably more than 50, more preferably more than 75, even more be ^¬ preferably more than 90, in particular more than 95 is.

5. The method according to any one of the preceding claims, characterized in that the cross-linking of at least two before Trains t ^¬ at least three, more preferably at least four, especially at least five layers of said inserts is.

6. The method according to any one of the preceding claims, characterized in that said plurality of inserts to ^¬ least 5 preferably at least 10, more preferably at least 20, even more preferably at least 30, especially at least 40.

7. The method according to any one of the preceding claims, characterized in that in the crosslinking at least 100, preferably at least 250, more preferably at least 500, even more preferably at least 750, in particular at least 1000 of the inserts per cubic meter of crosslinking are present.

8. The method according to any one of the preceding claims, characterized in that in the fiber composite material at least 100, preferably at least 250, more preferably at least 500, even more preferably at least 750, in particular at least 1000 Einle ^¬ geteile per cubic meter of the fiber composite material are present.

9. Method according to one of the preceding claims, characterized in that the matrix is a thermosetting matrix, preferably comprising, more preferably consisting of, a synthetic resin ^¬, in particular an epoxy resin.

10. The method according to any one of the preceding claims, characterized in that the fiber-matrix semifinished product according to step B), and optionally before step C), to below 0 ° C, preferably un ^¬ ter -10 ° C, more preferably below - 15 ° C, in particular below -20 ° C is cooled.

11. The method according to any one of claims 1-8, characterized in that the matrix is a thermoplastic matrix, be ^¬ preferably comprising, in particular consisting of

Polyetheretherketone or polypropylene.

12. The method according to any one of the preceding claims, characterized in that the fiber-matrix semifinished product is a prepreg.

13. Use of the method according to one of the preceding claims in land vehicle construction, in particular in road vehicle construction.

14. molded part made of a fiber composite material, obtainable from the method according to one of claims 2-12.

15. A fiber matrix semifinished product obtainable from the process according to any one of claims 1, 3-7 and 9-12.