Fibre-matrix semifinished product

1. A fibre-matrix semi-finished product comprising:

one or more semi-finished fibre product plies made of endless fibres, wherein:

the endless fibers are in the form of wovens, non-crimp fabrics, multiaxial non-crimp fabrics, stitched fabrics, braids, batts, felts, mats and unidirectional fibre strands or mixtures of these materials; and

the semi-finished fibre product plies each have a basis weight of 5 g/m 2 to 3000 g/m 2 ; and

a compound impregnating the entirety of all the semi-finished fibre product plies, the compound comprising:

component A)—at least one polyamide having a relative solution viscosity of 2.0 to 4.0 in m-cresol according to DIN EN ISO 307 at 25° C., as the matrix polymer, and

component B)—based on 100 parts by weight of component A), 5 to 100 parts by weight of at least one organic phosphinic acid salt of formula (I) and/or a diphosphinic acid salt of formula (II), and/or polymers thereof,

wherein:

R 1 and R 2 are identical or different and represent a linear or branched C 1 -C 6 -alkyl, and/or C 6 -C 10 -aryl,

R 3 represents linear or branched C 1 -C 10 -alkylene, C 6 -C 10 -arylene or C 1 -C 6 - alkylarylene or aryl-C 1 -C 6 -alkylene,

M represents aluminium, zinc or titanium and/or a protonated nitrogen base,

m is an integer from 1 to 4,

n is an integer from 1 to 3,

x is 1 or 2, and

n, x and m in formula (II) simultaneously adopt only integers such that the diphosphinic acid salt of formula (II) as a whole is uncharged, and

the fibre-matrix semi-finished product has a volume fraction of fibre materials of 25% to 65%, defined according to DIN 1310, and a volume fraction of air or gas of less than 15% and

wherein the compound further comprises any one of: C) and D); or C), D) and E), wherein:

component C)—at least one salt of melamine and condensed phosphoric acids;

component D)—zinc borate; and

component E)—talc,

and a weight ratio of component B) to component C) is 95:5 to 60:40, based on 100 parts by weight of a sum of component B) and component C); component D) is in an amount of 0.1 to 20 parts by weight, based on 100 parts by weight of component A); and if component E) is present, component E) is in amount of 0.01 to 50 parts by weight, based on 100 parts by weight of component A).

2. The fibre-matrix semi-finished product according to claim 1 , wherein M is aluminium.

3. The fibre-matrix semi-finished product according to claim 1 , wherein the protonated nitrogen bases are the protonated bases of 1,3,5-triazine compounds.

4. The fibre-matrix semi-finished product according to claim 1 , wherein R 1 and R 2 are identical or different and represent linear or branched C 1 -C 6 -alkyl and/or phenyl.

5. The fibre-matrix semi-finished product according to claim 1 , wherein the product is at least one of: over-moulded, under-moulded, surround-moulded, or has moulded-on functional elements.

6. The fibre-matrix semi-finished product according to claim 1 , wherein the product is at least one of: over-moulded via an in-mould process IMF, under-moulded via an in-mould process IMF, surround-moulded, via an in-mould process IMF, or has functional elements moulded-on via an in-mould process IMF.

7. The fibre-matrix semi-finished product according to claim 1 , wherein the product comprises 1 to 100 semi-finished fibre product plies, and the endless fibres are in the form of wovens or non-crimp fabrics.

8. The fibre-matrix semi-finished product according to claim 6 , wherein the endless fibres are in the form of wovens.

9. A process for producing a single-layered fibre-matrix semi-finished product, the process comprising:

applying a polymer compound to one or more semi-finished fibre product plies made of endless fibres, wherein:

each of the semi-finished fibre product plies has a basis weight of 5 g/m 2 to 3000 g/m 2 ; and

the semi-finished fibre product plies comprise the endless fibres in the form of wovens, non-crimp fabrics, multiaxial non-crimp fabrics, stitched fabrics, braids, batts, felts, mats and unidirectional fibre strands or mixtures of these materials; and

the polymer compound comprises:

component A)—at least one polyamide having a relative solution viscosity of 2.0 to 4.0 in m-cresol according to DIN EN ISO 307 at 25° C., and

component B)—based on 100 parts by weight of component A), 5 to 100 parts by weight of at least one organic phosphinic acid salt of formula (I) and/or a diphosphinic acid salt of formula (II) and/or polymers thereof,

wherein

R 1 and R 2 are identical or different and represent a linear or branched C 1 -C 6 -alkyl, and/or C 6 -C 10 -aryl;

R 3 represents linear or branched C 1 -C 10 -alkylene, C 6 -C 10 -arylene or C 1 -C 6 - alkylarylene or aryl-C 1 -C 6 -alkylene;

M represents aluminium, zinc or titanium and/or a protonated nitrogen base;

m is an integer from 1 to 4;

n is an integer from 1 to 3;

x is 1 or 2, and

n, x and m in formula (II) simultaneously adopt only integers such that the diphosphinic acid salt of formula (II) as a whole is uncharged; and

wherein the compound further comprises any one of: C) and D); or C), D) and E), wherein:

component C)—at least one salt of melamine and condensed phosphoric acids;

component D)—zinc borate; and

component E)—talc,

and a weight ratio of component B) to component C) is 95:5 to 60:40, based on 100 parts by weight of a sum of component B) and component C); component D) is in an amount of 0.1 to 20 parts by weight, based on 100 parts by weight of component A); and if component E) is present, component E) is in amount of 0.01 to 50 parts by weight, based on 100 parts by weight of component A);

heating the semi-finished fibre product plies with the polymer compound to a temperature greater than or equal to the melting temperature of the at least one polyamide in the compound, and applying pressure to the plies to impregnate the polymer compound into the plies and consolidate the entirety of all of the semi-finished fibre product plies to provide a composite having a volume fraction of fibre materials of 25% to 65% defined according to DIN 1310, and a volume fraction of air or gas of less than 15%; and

cooling and solidifying the polymer compound to obtain a fibre-matrix semi-finished product.

10. An article of manufacture comprising at least one fibre-matrix semi-finished product according to claim 1 .

11. The article of manufacture according to claim 10 , wherein the article is a component of: passenger vehicles, heavy goods vehicles, aircraft, aerospace vehicles, trains, garden appliances, domestic appliances, computer hardware, handheld electronic devices, leisure articles, sports equipment, machines, buildings, photovoltaic systems, or mechanical devices.

12. The fibre-matrix semi-finished product according to claim 1 , wherein:

the product comprises 2 to 40 semi-finished fibre product plies made of endless fibres;

the semi-finished fibre product plies each have a basis weight of 100 g/m 2 to 900 g/m 2 ;

component A) has a relative solution viscosity of 2.2 to 3.5 in m-cresol according to DIN EN ISO 307 at 25° C.;

the compound comprises 10 to 65 parts by weight of component B);

the volume fraction of fibre materials is 30% to 55%, defined according to DIN 1310; and

the volume fraction of air or gas is less than 10%.

13. The fibre-matrix semi-finished product according to claim 1 , wherein:

the product comprises 2 to 10 semi-finished fibre product plies made of endless fibres;

the semi-finished fibre product plies each have a basis weight of 150 g/m 2 to 750 g/m 2 ;

component A) has a relative solution viscosity of 2.4 to 3.1 in m-cresol according to DIN EN ISO 307 at 25° C.;

the compound comprises 20 to 60 parts by weight of component B);

the volume fraction of fibre materials is 40% to 50%, defined according to DIN 1310; and

the volume fraction of air or gas is less than 5%.