CN109895465A - Fibrous braid and its preparation method and application - Google Patents
Fibrous braid and its preparation method and application Download PDFInfo
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- CN109895465A CN109895465A CN201711297920.4A CN201711297920A CN109895465A CN 109895465 A CN109895465 A CN 109895465A CN 201711297920 A CN201711297920 A CN 201711297920A CN 109895465 A CN109895465 A CN 109895465A
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- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 18
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- 238000004519 manufacturing process Methods 0.000 claims description 12
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- 229940090248 4-hydroxybenzoic acid Drugs 0.000 claims description 10
- KAUQJMHLAFIZDU-UHFFFAOYSA-N 6-Hydroxy-2-naphthoic acid Chemical compound C1=C(O)C=CC2=CC(C(=O)O)=CC=C21 KAUQJMHLAFIZDU-UHFFFAOYSA-N 0.000 claims description 10
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Landscapes
- Reinforced Plastic Materials (AREA)
- Laminated Bodies (AREA)
- Woven Fabrics (AREA)
Abstract
The present invention relates to high performance composites fields, disclose a kind of for improving the fibrous braid and its preparation method and application of carbon fibre composite car body anti-seismic performance.Wherein, the fibrous braid is united by a seam carbon fiber single layer and Thermotropic Liquid Crystalline Copolyesters LCP fiber layer by loop bonding line, Thermotropic Liquid Crystalline Copolyesters LCP continuous fiber has good vibration Decay Rate, and such fabric is used in car body composite material, ride comfort and safety can be improved.Carbon fiber and LCP fiber participate in weaving into fabric in the form of continuous yarn: particularly, silvalin beam is arranged in after unidirectional ply along -45 °, 45 °, 0 ° or 90 ° of certain angle and is made into multi-axial fabric, and wherein LCP fibrous layer and carbon fiber layer are alternately superimposed according to the ratio of 1:1.The invention further relates to the application method of this kind of fabric and fields.
Description
Technical Field
The invention relates to the field of high-performance fiber composite materials, in particular to a fiber braided fabric and a preparation method and application thereof.
Background
Patent application CN1482176A discloses a composite material containing short fibers and thermotropic liquid crystalline polymers. The composition comprises the following components in parts by weight: 30-75 nylon 6, 9-50 short fibers and 1-20 thermotropic liquid crystal polymer. The short fiber is Glass Fiber (GF), Carbon Fiber (CF), Kevlar fiber or whisker. The Thermotropic Liquid Crystal Polymer (TLCP) is a main chain type aromatic copolyester, and the melting range is 190-360 ℃. The composite material has good fluidity and has unique advantages when being used for preparing large thin-wall parts and parts with fine structures.
Patent application CN105612202A discloses a fiber composite material (42) having at least one fiber layer (4,14,16) composed of a fiber material, which is embedded in a thermoplastic-based matrix (8,18), wherein the composition of the matrix (8,18) comprises: the fiber layers (4,14,16) are designed as unidirectional fiber layers, as fabric layers or scrim layers, as long fibers in the form of knitwear, hosiery or knits or random fiber mats or nonwovens, or as a combination thereof. The fibrous material comprises fibers comprised of one or more of the following fiber types: glass fibers, carbon fibers, basalt fibers, aramid fibers, liquid crystal polymer fibers, polyphenylene sulfide fibers, polyetherketone fibers, polyetheretherketone fibers, polyetherimide fibers.
Patent application CN102770260A discloses an intermediate material comprising an assembly of overlapping and interwoven tapes, at least some of the tapes, preferably all of the tapes, comprising a series of reinforcing yarns or monofilaments running in a direction parallel to the length of the tapes, so as to form a unidirectional sheet associated on each face of the unidirectional sheet with a non-woven formed of thermoplastic fibers, wherein the tapes are called landing tapes, the thermoplasticity of the two non-woven providing cohesion to the landing tapes. The thermoplastic fibers in each of the tabbing ribbons are selected from the group consisting of: polyamides, copolyamides, polyamide-block ethers or esters, polyphthalamides (PPA), polyesters (polyethylene terephthalate-PET-, polybutylene terephthalate-PBT-, etc.), copolyesters (CoPE), Thermoplastic Polyurethanes (TPU), polyacetals (POM, etc.), polyolefins, polyether sulfones (PES), polysulfones, polyphenylene sulfones, polyether ether ketones (PEEK), polyether ketone ketones (PEKK), poly (phenylene sulfide) (PPS) or Polyetherimides (PEI), thermoplastic polyimides, Liquid Crystal Polymers (LCP), phenoxy compounds, block copolymers such as styrene-butadiene-methyl methacrylate copolymers (SBM), methyl methacrylate-butyl acrylate-methyl methacrylate copolymers (MAM), or mixtures of fibers made from the thermoplastic materials.
By interweaving the intermediate material of the assembly of twisted tapes, the material is characterized in that at least some of the tapes, and preferably all of them, are composed of a series of reinforcing tows or monofilaments running in a direction parallel to the length of the tapes, so as to form a unidirectional sheet associated on each surface thereof with a non-woven fabric of thermoplastic fibers, called lap tape, said two non-woven fabrics ensuring the cohesion of said lap tape thanks to its thermoplastic characteristics.
Such products suffer from the following disadvantages: the manufacturing process of the strip is complex, the weaving difficulty on a weaving machine in a strip mode is high, and the production efficiency is low. The intermediate material in the existing scheme is applicable to a narrow composite material process type.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a fiber braided fabric and a preparation method and application thereof, wherein the fiber braided fabric has good shock resistance and attenuation, and in addition, the thermotropic liquid crystal polyarylate fiber can form a network in the fiber braided fabric, so that a sharp section can be prevented from being formed after the composite material is damaged, and a protective effect is realized on drivers and passengers.
In order to achieve the above object, a first aspect of the present invention provides a fiber braid, wherein the fiber braid comprises a single layer of carbon fibers and a single layer of thermotropic Liquid Crystalline Polyarylate (LCP) fibers stitched together by a stitch-bonding thread, wherein the LCP comprises structural units represented by formulae (1) and (2);
formula (1):formula (2):
preferably, the single layers of carbon fibers and the single layers of thermotropic liquid crystalline polyarylate fibers are alternately laid flat together; preferably, the number of carbon fiber single layers is 3 to 5, and the ratio of the number of carbon fiber single layers to the number of thermotropic liquid crystalline polyarylate fiber single layers is 1: (1-2), preferably 1: 1; and
the carbon fibers in the single layer of carbon fibers are tiled in plane at a density of 100-150 g/m, and the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers are tiled in plane at a density of 55-65 g/m, preferably 60 g/m.
Preferably, the carbon fibers in the single layer of carbon fibers and the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers are aligned along different angles;
further preferably, the carbon fibers in the single carbon fiber layer are aligned at any one of an angle of 90 °, -45 °, +45 °, and 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned along a different angle than said carbon fibers;
still further preferably, the carbon fibers in the single layer of carbon fibers are aligned at an angle of 90 ° or 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of-45 ° or +45 °; or
The carbon fibers in the carbon fiber single layer are arranged along an angle of-45 degrees or +45 degrees; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of 90 ° or 0 °.
Preferably, the carbon fibers, the thermotropic liquid crystalline polyarylate fibers, and the stitch-bonding threads are all continuous filaments;
further preferably, the stitch-bonded yarn is polyester;
the carbon fiber is one or more of polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber, viscose-based carbon fiber and phenolic aldehyde-based carbon fiber;
the thermotropic liquid crystal polyarylate fiber is prepared by reacting two monomers of p-hydroxybenzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA) with acetic anhydride for acetylation, then carrying out ester exchange reaction and deacetylation treatment, and carrying out melt random copolymerization, wherein a third component monomer can also be added for melt copolymerization.
Still more preferably, the carbon fiber is one or more of 1k, 3k, 6k, 12k, 24k and 50k, the tensile strength is 2900-; the fineness of the thermotropic liquid crystal polyarylate fiber is 28-1100dtex, the tensile strength is 3400-4100MPa, and the tensile modulus is 70.5-148 GPa.
Preferably, the thickness of the fiber weave is 0.35 to 0.65mm, preferably 0.4 to 0.6 mm.
The second aspect of the present invention provides a method for preparing a fiber woven fabric, wherein the preparation method comprises the following steps:
(1) tiling carbon fibers into a carbon fiber single layer;
(2) tiling thermotropic liquid crystal polyarylate fibers into a thermotropic liquid crystal polyarylate fiber single layer;
(3) sewing the single carbon fiber layer and the single thermotropic liquid crystal polyarylate fiber layer by using a sewing thread;
wherein the LCP contains structural units shown in formula (1) and formula (2);
formula (1):formula (2):
preferably, the single layers of carbon fibers and the single layers of thermotropic liquid crystalline polyarylate fibers are alternately laid flat together; preferably, the number of carbon fiber single layers is 3 to 5, and the ratio of the number of carbon fiber single layers to the number of thermotropic liquid crystalline polyarylate fiber single layers is 1: (1-2), preferably 1: 1; and
the carbon fibers in the single layer of carbon fibers are tiled in plane at a density of 100-150 g/m, and the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers are tiled in plane at a density of 55-65 g/m, preferably 60 g/m.
Preferably, the carbon fibers in the single layer of carbon fibers and the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers are aligned along different angles;
further preferably, the carbon fibers in the single carbon fiber layer are aligned at any one of an angle of 90 °, -45 °, +45 °, and 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned along a different angle than said carbon fibers;
still further preferably, the carbon fibers in the single layer of carbon fibers are aligned at an angle of 90 ° or 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of-45 ° or +45 °; or
The carbon fibers in the carbon fiber single layer are arranged along an angle of-45 degrees or +45 degrees; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of 90 ° or 0 °.
Preferably, the carbon fibers, the thermotropic liquid crystalline polyarylate fibers, and the stitch-bonding threads are all continuous filaments;
further preferably, the stitch-bonded yarn is polyester;
the carbon fiber is one or more of polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber, viscose-based carbon fiber and phenolic aldehyde-based carbon fiber;
the thermotropic liquid crystal polyarylate fiber is prepared by reacting two monomers of p-hydroxybenzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA) with acetic anhydride, performing acetylation, performing ester exchange reaction and acetic acid removal treatment, and performing melt random copolymerization.
Still more preferably, the carbon fiber is one or more of 1k, 3k, 6k, 12k, 24k and 50k, the tensile strength is 2900-; the fineness of the thermotropic liquid crystal polyarylate fiber is 28-1100dtex, the tensile strength is 3400-4100MPa, and the tensile modulus is 70.5-148 GPa.
The third aspect of the present invention provides a fiber woven fabric produced by the above-described production method.
Preferably, the thickness of the fiber weave is 0.35 to 0.65mm, preferably 0.4 to 0.6 mm.
The fourth aspect of the invention provides the application of the fiber braided fabric in the light weight of automobiles.
Through the technical scheme, the fiber braided fabric provided by the invention has the following advantages:
(1) in the prior art, the belt material for the intermediate material not only contains continuous yarns, but also contains non-woven fabrics formed by thermoplastic fibers, so that the process applicable to the intermediate material in the prior art has limitation, and the manufacturing process of the intermediate material is more complex than that of the scheme; the invention only contains continuous fiber yarn, and overcomes the defects.
(2) The fiber braided fabric is flat-laid by the fiber raw yarns as a plane layer, and the braided fabric is soft in cloth sample, good in shape following performance and convenient for resin infiltration; the method can be used for the preparation process of composite materials such as vacuum diversion, high-pressure RTM, wet molding and the like, and has stronger applicability.
(3) The thermoplastic liquid crystal polymer fibers contained in the prior art scheme are used for preparing the non-woven fabric in a chopped fiber mode, the LCP fibers added in the scheme are continuous fiber filaments, and the application mode and the preparation process of the fibers are greatly different.
(4) Particularly, thermotropic liquid crystal polyarylate LCP continuous fibers with good shock resistance and attenuation are woven in the fiber braided fabric, so that the shock resistance of the carbon fiber composite material car body can be improved.
(5) LCP fibre and carbon fiber arrange into the individual layer fibrous layer according to certain angle respectively, then will follow the fibrous layer of certain angle and LCP layer by the stitch knitting line and sew up together, and the multiaxial fabric that forms has good anti-seismic performance.
Drawings
FIG. 1 is a schematic structural diagram of a fiber woven fabric provided by the present invention;
fig. 2 is a graph showing vibration damping test of samples of the woven fabric of carbon fibers prepared in comparative example 1 and the woven fabric of fibers containing LCP fibers prepared in example 1 of the present invention.
Description of the reference numerals
1 sample 12 sample 2
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a fiber braid, wherein the fiber braid may be stitched with a single layer of carbon fiber and a single layer of thermotropic Liquid Crystalline Polyarylate (LCP) fiber by a stitch bonding thread, wherein the LCP has structural units represented by formulae (1) and (2);
formula (1):formula (2):
according to the invention, the single layers of carbon fibers and the single layers of thermotropic liquid crystalline polyarylate fibers may be laid flat alternately; in the invention, the carbon fiber or the thermotropic liquid crystal polyarylate fiber is flatly paved into the fiber layer in the form of fiber yarn bundles, so that the process flow can be shortened, the cost can be reduced, and the applicability of the fiber braided fabric can be wider.
According to the invention, the carbon fiber single layers and the thermotropic liquid crystal polyarylate fiber single layers are alternatively paved together, namely, the thermotropic liquid crystal polyarylate fiber single layers are paved on the carbon fiber single layers, then the carbon fiber single layers are paved on the thermotropic liquid crystal polyarylate fiber single layers, and the like, and the two layers are alternatively performed, wherein the number of the carbon fiber single layers and the number of the thermotropic liquid crystal polyarylate fiber single layers are not particularly limited, and the number of the carbon fiber single layers and the density of the carbon fiber and the thermotropic liquid crystal polyarylate fiber can be selected according to different requirements of application and different requirements of different parts of an automobile on shock resistance. For example, in the present invention, the number of carbon fiber monolayers may be 3 to 5, and the number of thermotropic liquid crystalline polyarylate fiber monolayers may be 3 to 6; preferably, the number of carbon fiber single layers may be 3 to 4, and the number of thermotropic liquid crystalline polyarylate fiber single layers may be 3 to 5; more preferably, the number of carbon fiber single layers is 4, and the number of thermotropic liquid crystalline polyarylate fiber single layers is 4; in the present invention, the ratio of the number of carbon fiber monolayers to the number of thermotropic liquid crystalline polyarylate fiber monolayers may be 1: (1-2), preferably 1: 1.
according to the present invention, the in-plane tiling density of the carbon fibers may be expressed in terms of the number of weight per square meter, for example, the in-plane tiling density of the carbon fibers in the single layer of carbon fibers may be 100-150 g/m, and the in-plane tiling density of the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers may be 55 to 65 g/m, preferably 60 g/m. If the amount of the thermotropic liquid crystalline polyarylate fiber used is too large, the tensile strength and rigidity of the fiber braid may be decreased, and if the amount of the thermotropic liquid crystalline polyarylate fiber used is too small, the effect of improving the seismic performance may not be well exerted.
According to the present invention, the carbon fibers in the carbon fiber single layer and the thermotropic liquid crystalline polyarylate fibers in the thermotropic liquid crystalline polyarylate fiber single layer may be tiled at a certain angle, and the carbon fibers in the carbon fiber single layer and the thermotropic liquid crystalline polyarylate fibers in the thermotropic liquid crystalline polyarylate fiber single layer are arranged along different angles; therefore, the manufactured fiber braided fabric has good shock resistance.
Further preferably, the carbon fibers in the single carbon fiber layer are aligned at any one of an angle of 90 °, -45 °, +45 °, and 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned along a different angle than said carbon fibers; therefore, the manufactured fiber braided fabric has better anti-seismic performance.
Still further preferably, the carbon fibers in the single layer of carbon fibers are aligned at an angle of 90 ° or 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of-45 ° or +45 °; or the carbon fibers in the carbon fiber single layer are arranged along an angle of-45 degrees or +45 degrees; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of 90 ° or 0 °. Thus, the manufactured fiber braided fabric has better shock resistance.
According to the present invention, the carbon fibers, the thermotropic liquid crystalline polyarylate fibers, and the stitch-bonding yarn may each be a continuous filament; that is, the continuous filaments are filaments that can be used as warp and weft yarns to weave fabrics, which are clearly distinguished from the lengths of fibers for non-woven fabrics and the lengths of chopped fibers.
According to the present invention, preferably, the stitch-bonded yarn is dacron.
According to the invention, the carbon fiber can be one or more of polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber, viscose-based carbon fiber and phenolic aldehyde-based carbon fiber; preferably, the carbon fiber is a polyacrylonitrile-based carbon fiber.
According to the invention, the thermotropic liquid crystal polyarylate fiber is prepared by reacting two monomers of p-hydroxybenzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA) with acetic anhydride for acetylation, then carrying out ester exchange reaction and deacetylation treatment, and carrying out melt random copolymerization, and a third component monomer can also be added for melt copolymerization. According to the invention, the carbon fiber is one or more of 1k, 3k, 6k, 12k, 24k and 50k, the tensile strength is 2900-; preferably, the carbon fiber is 12k or 24k, the fineness of the thermotropic liquid crystal polyarylate fiber is 28 to 1100dtex, the tensile strength can be 3400-4100MPa, and the tensile modulus can be 70.5 to 148 GPa.
According to the present invention, more preferably, the thermotropic liquid crystalline polyarylate fiber has a fineness of 1100dtex, a tensile strength of 2900MPa, and a tensile modulus of 135 GPa.
In the present invention, it is further preferable that the thermotropic liquid crystalline polyarylate fiber has a tensile strength lower than that of the carbon fiber, and the thermotropic liquid crystalline polyarylate fiber has a tensile modulus lower than that of the carbon fiber, so that the prepared fiber braid has a better seismic performance due to the good seismic attenuation of the thermotropic liquid crystalline polyarylate fiber.
According to the invention, the thickness of the fiber braid may be 0.35 to 0.65mm, preferably 0.4 to 0.6 mm.
In a second aspect, the present invention provides a method for preparing a fiber woven fabric, wherein the preparation method comprises the following steps:
(1) tiling carbon fibers into a carbon fiber single layer;
(2) tiling thermotropic liquid crystal polyarylate fibers into a thermotropic liquid crystal polyarylate fiber single layer;
(3) sewing the single carbon fiber layer and the single thermotropic liquid crystal polyarylate fiber layer by using a sewing thread;
wherein the LCP contains structural units shown in formula (1) and formula (2);
formula (1):formula (2):
according to the preparation method, the single carbon fiber layer and the single thermotropic liquid crystal polyarylate fiber layer can be alternatively tiled together; in the invention, the carbon fiber or the thermotropic liquid crystal polyarylate fiber is flatly paved into the fiber layer in the form of fiber yarn bundles, so that the process flow can be shortened, the cost can be reduced, and the applicability of the fiber braided fabric can be wider.
According to the preparation method, the carbon fiber single layers and the thermotropic liquid crystal polyarylate fiber single layers are alternately paved, namely, one thermotropic liquid crystal polyarylate fiber single layer is paved on the carbon fiber single layer, then one carbon fiber single layer is paved on the thermotropic liquid crystal polyarylate fiber single layer, and the like, the two layers are alternately paved, the number of the carbon fiber single layers and the number of the thermotropic liquid crystal polyarylate fiber single layers are not particularly limited, and the number of the layers and the densities of the carbon fiber and the thermotropic liquid crystal polyarylate fiber can be selected according to different requirements of application and different requirements of different parts of an automobile on anti-seismic performance. For example, in the present invention, the number of carbon fiber monolayers may be 3 to 5, and the number of thermotropic liquid crystalline polyarylate fiber monolayers may be 3 to 6; preferably, the number of carbon fiber single layers may be 3 to 4, and the number of thermotropic liquid crystalline polyarylate fiber single layers may be 3 to 5; more preferably, the number of carbon fiber single layers is 4, and the number of thermotropic liquid crystalline polyarylate fiber single layers is 4; in the present invention, the ratio of the number of carbon fiber monolayers to the number of thermotropic liquid crystalline polyarylate fiber monolayers may be 1: (1-2), preferably 1: 1.
according to the preparation method of the present invention, the in-plane tiling density of the carbon fibers may be expressed in terms of the number of weight per square meter, for example, the in-plane tiling density of the carbon fibers in the single layer of carbon fibers may be 100-150 g/m, and the in-plane tiling density of the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers may be 55 to 65 g/m, preferably 60 g/m. If the amount of the thermotropic liquid crystalline polyarylate fiber used is too large, the tensile strength and rigidity of the fiber braid may be decreased, and if the amount of the thermotropic liquid crystalline polyarylate fiber used is too small, the effect of improving the seismic performance may not be well exerted.
According to the preparation method, the carbon fibers in the carbon fiber single layer and the thermotropic liquid crystal polyarylate fibers in the thermotropic liquid crystal polyarylate fiber single layer can be tiled at a certain angle, and the carbon fibers in the carbon fiber single layer and the thermotropic liquid crystal polyarylate fibers in the thermotropic liquid crystal polyarylate fiber single layer are arranged at different angles; therefore, the manufactured fiber braided fabric has good shock resistance.
Further preferably, the carbon fibers in the single carbon fiber layer are aligned at any one of an angle of 90 °, -45 °, +45 °, and 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned along a different angle than said carbon fibers; therefore, the manufactured fiber braided fabric has better anti-seismic performance.
Still further preferably, the carbon fibers in the single layer of carbon fibers are aligned at an angle of 90 ° or 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of-45 ° or +45 °; or the carbon fibers in the carbon fiber single layer are arranged along an angle of-45 degrees or +45 degrees; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of 90 ° or 0 °. Thus, the manufactured fiber braided fabric has better shock resistance.
According to the manufacturing method of the present invention, the carbon fibers, the thermotropic liquid crystalline polyarylate fibers, and the stitch-bonding yarn may each be a continuous filament; that is, the continuous filaments are filaments that can be used as warp and weft yarns to weave fabrics, which are clearly distinguished from the lengths of fibers for non-woven fabrics and the lengths of chopped fibers.
According to the preparation method of the invention, preferably, the stitch-bonded yarn is terylene. In addition, in the preparation method of the present invention, the sewing manner of the stitch yarn is not particularly limited, and for example, may be a "one-over-one-under" sewing method, or may be a "two-over-two-under" sewing method, which is a well-known sewing method by those skilled in the art and will not be described herein again.
According to the preparation method, the carbon fiber can be one or more of polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber, viscose-based carbon fiber and phenolic aldehyde-based carbon fiber; preferably, the carbon fiber is a polyacrylonitrile-based carbon fiber.
According to the preparation method, the thermotropic liquid crystal polyarylate fiber is prepared by reacting two monomers of p-hydroxybenzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA) with acetic anhydride, performing acetylation, performing ester exchange reaction and deacetylation treatment, and performing melt random copolymerization.
According to the preparation method, the carbon fiber is one or more of 1k, 3k, 6k, 12k, 24k and 50k, the tensile strength is 2900-4900MPa, and the tensile modulus is 230-290 GPa; preferably, the carbon fiber is 12k and/or 24k, the tensile strength can be 3400-.
According to the preparation method of the present invention, the specifications of the carbon fiber yarn include, but are not limited to, 1 to 24K, 48K and 50K. Where 1-24K, 48K and 50K refer to the specifications of carbon fibers, and indicate the number of filaments in a carbon fiber tow, for example, 1K 1000 (root), 3K 3000 (root), 6K 6000 (root), and 12K 12000 (root). Meanwhile, 1K, 3K, 6K, 12K, 24K are also called small tows, and 48K or more are large tows.
According to the preparation method of the present invention, more preferably, the thermotropic liquid crystalline polyarylate fiber has a fineness of 1100Dtex/96, a tensile strength of 2900MPa, and a tensile modulus of 135 GPa.
In the present invention, it is further preferable that the thermotropic liquid crystalline polyarylate fiber has a tensile strength lower than that of the carbon fiber, and the thermotropic liquid crystalline polyarylate fiber has a tensile modulus lower than that of the carbon fiber, so that the prepared fiber braid has a better seismic performance due to the good seismic attenuation of the thermotropic liquid crystalline polyarylate fiber.
The thickness of the woven or knitted fiber fabric produced according to the production method of the present invention may be 0.35 to 0.65mm, preferably 0.4 to 0.6 mm.
In a third aspect, the present invention provides a fiber woven fabric produced by the above-described production method.
According to the invention, the thickness of the fiber braid is 0.35 to 0.65. mu.m, preferably 0.4 to 0.6. mu.m.
In a fourth aspect, the invention provides the application of the fiber braided fabric in the light weight of automobiles.
In the present invention, the fiber woven fabric is not particularly limited to a specific part to be applied to an automobile, and may be applied to an automobile as an automobile interior, for example, to an automobile shell or a seat.
According to the invention, the thermotropic liquid crystal polyarylate LCP continuous fiber is added into the carbon fiber, and the thermotropic liquid crystal polyarylate LCP continuous fiber has good vibration attenuation, so that the fiber is used in the composite material of the car body, the shock resistance of the car body can be improved, and the driving comfort and the safety can be improved; in addition, the thermotropic liquid crystal polyarylate LCP continuous fiber can form a network in a fiber braided fabric, and can prevent the fiber braided fabric from forming a sharp section after being damaged, thereby protecting drivers and passengers.
The present invention will be described in detail below by way of examples.
In the following embodiments, the vibration damping parameters of the test sample are measured by a damping vibration damping test method;
the carbon fiber raw material is a product sold by Taili company under the mark TC-36P.
The LCP fiber material was a commercially available product of 1100dtex/96, manufactured by Kyowa Kagaku Co.
Example 1
This example is intended to illustrate the fiber fabric of the present invention, its preparation and use.
(1) Preparing a carbon fiber single layer: the carbon fiber single layer C1 tiled according to an angle of 0 degree, the carbon fiber single layer C2 tiled according to an angle of 45 degrees, the carbon fiber single layer C3 tiled according to an angle of 90 degrees, and the carbon fiber single layer C4 tiled according to an angle of-45 degrees;
the carbon fiber is polyacrylonitrile-based carbon fiber, and is 12k, the tensile strength is 4900MPa, and the tensile modulus is 250 GPa.
(2) C1, C2, C3 and C4 are sequentially laid on a horizontal plane, specifically, referring to fig. 1, carbon fiber single layers and LCP single layers are alternately laid, and the ratio of the number of the carbon fiber single layers to the number of the LCP single layers is 1: 1, and the carbon fibers are laid flat in a plane with a density of 150 grams per square meter.
(3) The polyester yarn is used for sewing the C1-C4 layers together to form the fiber braided fabric W1, the process is simple, the fiber braided fabric is flat-laid by fiber yarns as a plane layer, the cloth sample of the braided fabric is soft, the shape following performance is good, and resin infiltration is facilitated; the method can be used for the preparation process of composite materials such as vacuum diversion, high-pressure RTM, wet molding and the like, and has stronger applicability.
The fiber woven fabric W1 is applied to an automobile interior, for example, a seat of an automobile driver. And the test result is shown in table 1, and the measured vibration attenuation curve map can be seen from the sample 1 in fig. 2, the spectrum amplitude is relatively flat, and the logarithmic attenuation rate is small.
Comparative example 1
A fiber woven fabric was prepared in the same manner as in example 1, except that the carbon fiber single layer in step (2) was replaced with an LCP fiber single layer. The LCP fibers are laid flat in plane with a density of 60 grams per square meter
The result is a fiber weave D1.
The fiber woven fabric D1 was applied to the interior of an automobile, for example, a seat of an automobile driver. And the test result is shown in table 1, and the measured vibration attenuation curve map can be seen from the sample 2 in fig. 2, the spectrum amplitude is relatively large, and the logarithmic attenuation rate is large.
TABLE 1
It can be seen from the examples that the fiber woven fabric prepared by the preparation method of the invention has simple process because the invention only contains continuous fiber yarns. The fiber braided fabric is flat-laid by the fiber raw yarns as a plane layer, and the braided fabric is soft in cloth sample, good in shape following performance and convenient for resin infiltration; the method can be used for the preparation process of composite materials such as vacuum diversion, high-pressure RTM, wet molding and the like, and has stronger applicability. Particularly, thermotropic liquid crystal polyarylate LCP continuous fibers with good shock resistance and attenuation are woven in the fiber braided fabric, so that the shock resistance of the carbon fiber composite material car body can be improved. LCP fibre and carbon fiber arrange into the individual layer fibrous layer according to certain angle respectively, then will follow the fibrous layer of certain angle and LCP layer by the stitch knitting line and sew up together, and the multiaxial fabric that forms can have good anti-seismic performance.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (12)
1. A fiber woven fabric, characterized in that a single layer of carbon fiber and a single layer of thermotropic Liquid Crystalline Polyarylate (LCP) fiber are stitched together by a stitch-bonding thread, wherein the LCP has structural units represented by formula (1) and formula (2);
2. the fiber fabric of claim 1, wherein the single layers of carbon fibers and the single layers of thermotropic liquid crystalline polyarylate fibers are alternately laid flat together; preferably, the number of carbon fiber single layers is 3 to 5, and the ratio of the number of carbon fiber single layers to the number of thermotropic liquid crystalline polyarylate fiber single layers is 1: (1-2); and
the carbon fibers in the single carbon fiber layer are tiled in plane at a density of 100-150 g/m, and the thermotropic liquid crystalline polyarylate fibers in the single thermotropic liquid crystalline polyarylate fiber layer are tiled in plane at a density of 55-65 g/m.
3. The fiber fabric of claim 1 or 2, wherein the carbon fibers in the single layer of carbon fibers and the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers are aligned along different angles;
preferably, the carbon fibers in the single layer of carbon fibers are aligned at any one of an angle of 90 °, -45 °, +45 °, and 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned along a different angle than said carbon fibers;
further preferably, the carbon fibers in the single layer of carbon fibers are aligned at an angle of 90 ° or 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of-45 ° or +45 °; or,
the carbon fibers in the carbon fiber single layer are arranged along an angle of-45 degrees or +45 degrees; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of 90 ° or 0 °.
4. The fiber fabric of claim 3, wherein the carbon fibers, the thermotropic liquid crystalline polyarylate fibers, and the stitch-bonded yarns are each continuous filaments;
preferably, the stitch-bonded yarn is terylene;
the carbon fiber is one or more of polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber, viscose-based carbon fiber and phenolic aldehyde-based carbon fiber;
the thermotropic liquid crystal polyarylester fiber is obtained by performing acetylation on a monomer p-hydroxybenzoic acid, a monomer 2-hydroxy-6-naphthoic acid and acetic anhydride, performing ester exchange reaction and deacetylation treatment, and performing melt random copolymerization;
further preferably, the carbon fiber is one or more of 1k, 3k, 6k, 12k, 24k and 50k, the tensile strength is 2900-; the fineness of the thermotropic liquid crystal polyarylate fiber is 28-1100dtex, the tensile strength is 3400-4100MPa, and the tensile modulus is 70.5-148 GPa.
5. A fibre fabric according to claim 1, wherein the thickness of the fibre weave is 0.35-0.65 μm, preferably 0.4-0.6 μm.
6. A method for preparing a fiber woven fabric, which is characterized by comprising the following steps:
(1) tiling carbon fibers into a carbon fiber single layer;
(2) tiling thermotropic liquid crystal polyarylate fibers into a thermotropic liquid crystal polyarylate fiber single layer;
(3) sewing the single carbon fiber layer and the single thermotropic liquid crystal polyarylate fiber layer by using a sewing thread;
wherein the thermotropic liquid crystal polyarylate fiber LCP comprises structural units represented by formula (1) and formula (2);
7. the production method according to claim 6, wherein the single layers of carbon fibers and the single layers of thermotropic liquid-crystalline polyarylate fibers are alternately laid flat together; preferably, the number of carbon fiber single layers is 3 to 5, and the ratio of the number of carbon fiber single layers to the number of thermotropic liquid crystalline polyarylate fiber single layers is 1: (1-2); and
the carbon fibers in the single carbon fiber layer are tiled in plane at a density of 100-150 g/m, and the thermotropic liquid crystalline polyarylate fibers in the single thermotropic liquid crystalline polyarylate fiber layer are tiled in plane at a density of 55-65 g/m.
8. The production method according to claim 6 or 7, wherein the carbon fibers in the single layer of carbon fibers and the thermotropic liquid crystalline polyarylate fibers in the single layer of thermotropic liquid crystalline polyarylate fibers are aligned along different angles;
preferably, the carbon fibers in the single layer of carbon fibers are aligned at any one of an angle of 90 °, -45 °, +45 °, and 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned along a different angle than said carbon fibers;
further preferably, the carbon fibers in the single layer of carbon fibers are aligned at an angle of 90 ° or 0 °; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of-45 ° or +45 °; or,
the carbon fibers in the carbon fiber single layer are arranged along an angle of-45 degrees or +45 degrees; the thermotropic liquid crystalline polyarylate fibers in said single layer of thermotropic liquid crystalline polyarylate fibers are aligned at an angle of 90 ° or 0 °.
9. The production method according to claim 6, wherein the carbon fibers, the thermotropic liquid-crystalline polyarylate fibers, and the stitch-bonding yarn are each continuous filaments;
preferably, the stitch-bonded yarn is terylene;
the carbon fiber is one or more of polyacrylonitrile-based carbon fiber, asphalt-based carbon fiber, viscose-based carbon fiber and phenolic aldehyde-based carbon fiber;
the thermotropic liquid crystal polyarylester fiber is obtained by performing acetylation on a monomer p-hydroxybenzoic acid, a monomer 2-hydroxy-6-naphthoic acid and acetic anhydride, performing ester exchange reaction and deacetylation treatment, and performing melt random copolymerization;
further preferably, the carbon fiber is one or more of 1k, 3k, 6k, 12k, 24k and 50k, the tensile strength is 2900-; the fineness of the thermotropic liquid crystal polyarylate fiber is 28-1100dtex, the tensile strength is 3400-4100MPa, and the tensile modulus is 70.5-148 GPa.
10. A fiber woven fabric produced by the production method according to any one of claims 6 to 9.
11. A fibrous textile according to claim 10, wherein the fibrous textile has a thickness of 0.35 to 0.65 μm, preferably 0.4 to 0.6 μm.
12. Use of the fiber woven fabric according to any one of claims 1 to 5 and the fiber woven fabric according to claim 10 for weight reduction of automobiles.
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| CN111155224A (en) * | 2020-02-17 | 2020-05-15 | 上海市纺织科学研究院有限公司 | Preparation method of polyarylester fiber-based self-lubricating fabric |
| CN114536924A (en) * | 2022-01-17 | 2022-05-27 | 宁波海格拉新材料科技有限公司 | Flame-retardant low-moisture-absorption liquid crystal polyarylate honeycomb core material and preparation method thereof |
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| CN101589185A (en) * | 2006-11-16 | 2009-11-25 | 霍尼韦尔国际公司 | Form the method for unidirectionally oriented fiber structures |
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| CN101589185A (en) * | 2006-11-16 | 2009-11-25 | 霍尼韦尔国际公司 | Form the method for unidirectionally oriented fiber structures |
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| CN111155224A (en) * | 2020-02-17 | 2020-05-15 | 上海市纺织科学研究院有限公司 | Preparation method of polyarylester fiber-based self-lubricating fabric |
| CN114536924A (en) * | 2022-01-17 | 2022-05-27 | 宁波海格拉新材料科技有限公司 | Flame-retardant low-moisture-absorption liquid crystal polyarylate honeycomb core material and preparation method thereof |
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