Longitudinal conductive basalt fiber composite material and preparation method thereof

Abstract

The invention discloses a longitudinally conductive basalt fiber composite material and a preparation method thereof, and belongs to the technical field of fiber reinforced composite materials, and the preparation method comprises the following steps: treating a desized basalt fiber plain weave fabric in a high-temperature and high-pressure water environment to obtain a hydroxylated basalt fiber plain weave fabric; dispersing the metal nanoparticles in a tannic acid solution to obtain tannic acid modified metal nanoparticles; depositing the tannic acid modified metal nanoparticles on the surface of the hydroxylated basalt fiber plain weave fabric to obtain a metal nanoparticle modified basalt fiber plain weave fabric; dispersing the conductive filler, blending with polycarbonate, and performing hot pressing to prepare a composite sheet; laying, hot-pressing and annealing the metal nanoparticle modified basalt fiber plain weave fabric and the composite sheet to prepare the basalt fiber composite material; by modifying the basalt fiber plain weave fabric, the interface bonding between the basalt fiber plain weave fabric and the matrix is increased, and the conductive composite sheet is introduced, so that the longitudinal conductivity of the basalt fiber composite material is improved.

Description

Technical Field

[0001] The present invention relates to a basalt fiber composite material capable of longitudinal conduction and a preparation method thereof, belonging to the technical field of fiber-reinforced composite materials. Background Art

[0002] Fiber-reinforced composite materials, due to their high strength-to-mass ratio, low density, excellent mechanical properties and corrosion resistance, are widely used as structural-functional integrated materials and have broad development prospects in the fields of aerospace, shipbuilding, automotive industry, civil construction, etc. With the exploration of the application value of fiber-reinforced composite materials in various industries, the functionality during service has received more and more attention. In recent years, basalt fibers have been vigorously developed both internationally and domestically. Due to their higher strength than glass fibers, lower price than carbon fibers, and pollution-free characteristics, they have been highly sought after by domestic and foreign enterprises and scholars.

[0003] Since basalt fibers and the matrix have intrinsic insulation, the prepared basalt fiber composite materials do not have functionality, which limits the application fields of basalt fiber composite materials. Before endowing basalt fiber composite materials with functionality, their electrical properties should be improved. Currently, there are three ways to improve the electrical properties of basalt fiber composite materials. The first is to embed an additional conductive thin film in the basalt fiber composite material. This will introduce a large number of stress concentration points at the embedding position, reducing the overall mechanical properties of the basalt fiber composite material; and due to the heterogeneity of the strength of the embedded material and the host material, the asynchrony of their damage occurs, and delamination damage is very likely to occur. The second way is to introduce conductive nano-fillers into the composite matrix, thereby endowing the basalt fiber composite material with conductivity. The introduction of conductive nano-fillers undoubtedly increases the viscosity of the matrix, increasing the difficulty of composite material preparation and production costs; in addition, the agglomeration of conductive nano-fillers is also a major shortcoming that is difficult to overcome by this method. The third way is to deposit conductive nano-fillers on the surface of basalt fibers by physical or chemical means. Although this method can improve the electrical properties of basalt fiber composite materials, current research is less. The reason is that the combination between the fiber and the conductive nano-fillers is weak or the deposition amount of the conductive nano-fillers on the fiber surface is small, and its mechanical and electrical properties cannot be effectively improved. In addition, most of these three ways improve the transverse electrical conductivity of basalt fiber composite materials. Due to the lack of longitudinal conduction paths, the improvement of the longitudinal electrical conductivity of basalt fiber composite materials is limited.

[0004] In response to this series of challenges, combining the advantages of surface conductivity of basalt fibers and the dispersion of conductive nano-fillers in the matrix, we propose a basalt fiber composite material capable of longitudinal conduction and a preparation method thereof. Compared with other methods of endowing basalt fiber composite materials with conductivity, the present invention has the characteristics of simple operation, high economic benefits, obvious gain effect, etc. Summary of the Invention

[0005] The present invention mainly overcomes the deficiencies in the prior art, and provides a basalt fiber composite material capable of longitudinal conduction and a preparation method thereof. The basalt fiber composite material prepared by this method realizes conduction not only in the transverse direction but also in the longitudinal direction while the transverse conductivity is improved.

[0006] The technical solution provided by the present invention to solve the above technical problems is: a preparation method of a basalt fiber composite material capable of longitudinal conduction, comprising the following steps: S1. Place the desized basalt fiber plain fabric in a high-temperature and high-pressure water environment for treatment to obtain a hydroxylated basalt fiber plain fabric; S2. Dissolve tannic acid in tris(hydroxymethyl)aminomethane solution to prepare a tannic acid solution, and disperse metal nanoparticles in the tannic acid solution to obtain tannic acid-modified metal nanoparticles; S3. Deposit the tannic acid-modified metal nanoparticles obtained in S2 on the surface of the hydroxylated basalt fiber plain fabric obtained in S1 to obtain a basalt fiber plain fabric modified with metal nanoparticles; S4. Disperse the conductive filler, blend it with polycarbonate, and hot-press to prepare a composite sheet; S5. Lay the basalt fiber plain fabric modified with metal nanoparticles obtained in S3 and the composite sheet obtained in S4, hot-press, and anneal to prepare a basalt fiber composite material.

[0007] A further technical solution is that in S1, the high temperature is 150 - 220 °C, the high pressure is 2 MPa, and the treatment time is 5 h.

[0008] A further technical solution is that in S2, the content of tannic acid is 1 - 5 mg / mL.

[0009] A further technical solution is that in S2, the pH of the tris(hydroxymethyl)aminomethane solution is 8.3 - 8.7, and the content of tris(hydroxymethyl)aminomethane is 10 - 40 mM.

[0010] A further technical solution is that in S2, the metal nanoparticles are one of metal nanospheres, metal nanowires, and metal nanosheets.

[0011] Even further, the particle size range of the metal nanoparticles is 100 - 500 nm.

[0012] Even further, the concentration of the metal nanoparticles is 0.05 - 0.20 mg / mL, and the modification time is 2 h.

[0013] Even further, the particle size range of the tannic acid-modified metal nanoparticles is 200 - 800 nm.

[0014] Furthermore, the mass fraction of tannic acid in the tannic acid-modified metal nanoparticles is 0.09 - 0.12 wt%.

[0015] A further technical solution is that the deposition method in S3 is suction filtration deposition.

[0016] Furthermore, the number of suction filtration times is two, and suction filtration deposition is carried out on the front and back sides of the hydroxylated basalt fiber plain fabric in sequence.

[0017] A further technical solution is that the mass fraction of the tannic acid-modified metal nanoparticles in the basalt fiber plain fabric modified with metal nanoparticles in S3 is 0.50 - 0.80 wt%.

[0018] A further technical solution is that the conductive filler in S4 is a mixture of carbon fiber powder, carbon nanotubes and transition metal carbonitrides.

[0019] Furthermore, the mass ratio of the carbon fiber powder, the carbon nanotubes and the transition metal carbonitrides is 6:3:1.

[0020] A further technical solution is that the dispersion method in S4 is ball milling dispersion.

[0021] Furthermore, the dispersion time is 10 h.

[0022] A further technical solution is that the mass ratio of the conductive filler to the polycarbonate in S4 is 3:97.

[0023] A further technical solution is that the blending method in S4 is ball milling blending.

[0024] Furthermore, the blending time is 6 h.

[0025] A further technical solution is that the thickness of the composite sheet in S4 is 400 - 600 μm.

[0026] A further technical solution is that the ball milling environment is a water-cooled interlayer and a nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, the ball milling medium is zirconia balls, and the diameter of the zirconia balls is 3 - 5 mm.

[0027] A further technical solution is that the laying method in S5 is alternating laying, the number of layers of the composite sheet is 10 layers, the number of layers of the basalt fiber plain fabric modified with metal nanoparticles is 9 layers, and the upper and lower surfaces are composite sheets.

[0028] Furthermore, the laying method of adjacent basalt fiber plain fabrics modified with metal nanoparticles is symmetric laying with a gradually changing angle.

[0029] Furthermore, the ply stacking sequence is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0030] A further technical solution is that the annealing temperature in S5 is 120 °C and the time is 1 h.

[0031] The second technical problem to be solved by the present invention is to provide a longitudinally conductive basalt fiber composite material prepared by the above method.

[0032] A further technical solution is that the mass fraction of basalt fibers in the basalt fiber composite material is 58 - 63 wt%.

[0033] A further technical solution is that the density of the basalt fiber composite material is 1.80 - 1.85 g / cm 3 , and the porosity is 3.6 - 4.4%.

[0034] A further technical solution is that the flexural strength of the basalt fiber composite material is 810 - 960 MPa.

[0035] A further technical solution is that the basalt fiber composite material has a hierarchical conductive network structure.

[0036] Furthermore, the transverse conductivity of the basalt fiber composite material is 2.0 - 7.0×10 -2 S / m, and the longitudinal conductivity is 3.7 - 6.2×10 -3 S / m.

[0037] The present invention has the following beneficial effects: (1) By hydrothermal treatment, the basalt fiber plain weave fabric is hydroxylated, and metal nanoparticles are modified with tannic acid. The basalt fibers and metal nanoparticles can be combined in the form of hydrogen bonds, effectively preventing the deposited metal nanoparticles from falling off the surface of the basalt fibers; the deposited metal nanoparticles increase the surface roughness of the basalt fibers, and at the same time, the active groups of tannic acid are combined with the polycarbonate matrix in various ways including chemical bonds and hydrogen bonds, improving the interfacial bonding between the basalt fibers and the matrix, and achieving the purpose of enhancing the mechanical properties of the basalt fiber composite material.

[0038] (2) In the present invention, the metal nanoparticles modified by tannic acid are deposited on the surface of basalt fiber plain fabric by a suction filtration method, which has the characteristics of simplicity, feasibility, and high economic efficiency. In addition, the metal nanoparticles modified by tannic acid can construct a transition layer at the interface between the basalt fiber and the polycarbonate matrix, which is beneficial to slowing down the modulus mutation from the basalt fiber to the polycarbonate matrix. At the same time, the matrix of the embedded composite sheet serves as the matrix of the basalt fiber composite material, which can effectively reduce the incompatibility of heterogeneous materials and avoid the mechanical mismatch of the composite material.

[0039] (3) The present invention uses metal nanoparticles to modify the basalt fiber plain fabric, endowing the basalt fiber plain fabric with conductivity. The basalt fiber plain fabric is connected to the conductive composite sheet, making up for the disadvantage of the low longitudinal conductivity of traditional conductive basalt fiber composite materials. Moreover, the three-dimensional conductive network structure constructed by carbon fibers, carbon nanotubes, and transition metal carbonitrides in the composite sheet and the conductive network existing on the surface of the basalt fiber together form a multi-scale conductive network structure, which is beneficial to the effective transfer of electrons and can further improve the longitudinal conductivity of the basalt fiber composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is the preparation flow chart of the present invention; Figure 2 is the scanning electron microscope image of the basalt fiber plain fabric modified by metal nanoparticles; Figure 3 is the flexural strength diagram of the basalt fiber composite material; Figure 4 is the conductivity diagram of the basalt fiber composite material. DETAILED DESCRIPTION OF THE INVENTION

[0041] The present invention will be further described below in conjunction with examples, comparative examples, and the drawings.

[0042] Example 1

[0043] As Figure 1 shown, a preparation method of a longitudinally conductive basalt fiber composite material of the present invention comprises the following steps: Step 1: Place the desized basalt fiber plain fabric at 180 °C and 2 MPa for 5 h to obtain hydroxylated basalt fiber plain fabric; Step 2: Dissolve tannic acid with a content of 2 mg / mL in tris(hydroxymethyl)aminomethane solution with a pH of 8.5 to prepare a tannic acid solution. Disperse copper nanospheres with a concentration of 0.10 mg / mL in the tannic acid solution, and the modification time is 2 h to obtain tannic acid-modified copper nanospheres with a particle size range of 200 - 800 nm; Among them, the content of tris(hydroxymethyl)aminomethane is 10 mM, and the particle size range of copper nanospheres is 100 - 500 nm; At normal temperature and pressure, the mass fraction of tannic acid in tannic acid-modified copper nanospheres was measured by the weighing method, and the mass fraction of tannic acid in tannic acid-modified copper nanospheres was 0.11 wt%; Step 3: Filter-deposit the tannic acid-modified copper nanospheres onto the surface of hydroxylated basalt fiber plain fabric to obtain basalt fiber plain fabric modified with copper nanospheres; Among them, the number of filtration times is two, and the filtration deposition is carried out on the front and back sides of the hydroxylated basalt fiber plain fabric in turn; At normal temperature and pressure, the mass fraction of tannic acid-modified copper nanospheres in the basalt fiber plain fabric modified with copper nanospheres was measured by the weighing method, and the mass fraction of tannic acid-modified copper nanospheres in the basalt fiber plain fabric modified with copper nanospheres was 0.70 wt%; Step 4: Ball-mill and disperse 0.54 g of carbon fiber powder, 0.27 g of carbon nanotubes and 0.09 g of transition metal carbonitride mixture for 10 h, and ball-mill and blend with 29.1 g of polycarbonate for 6 h, and hot-press to prepare a composite sheet with a thickness of 400 - 600 μm; Among them, the ball-milling environment is a water-cooled sandwich and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, the ball-milling medium is zirconia balls, and the diameter of the zirconia balls is 3 - 5 mm; Step 5: Alternately stack 9 layers of basalt fiber plain fabric modified with copper nanospheres and 10 layers of composite sheets, hot-press, and anneal at 120 °C for 1 h to prepare a basalt fiber composite material; Among them, the upper and lower surfaces of the stack are composite sheets, and the laying method of adjacent basalt fiber plain fabrics modified with copper nanospheres is symmetric laying with gradually changing angles, and the laying order is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0044] The mass fraction of basalt fiber and the density of the basalt fiber composite material prepared in Example 1 were measured by the weighing method at normal temperature and pressure. At the same time, the porosity of the basalt fiber composite material was measured by the mass density method. The mass fraction of basalt fiber was 63 wt%, and the density of the basalt fiber composite material was 1.84 g / cm 3 , and the porosity was 3.9%.

[0045] Comparative Example 1 Step 1: Ball-mill and disperse 0.54 g of carbon fiber powder, 0.27 g of carbon nanotubes and 0.09 g of transition metal carbonitride mixture for 10 h, and ball-mill and blend with 29.1 g of polycarbonate for 6 h, and hot-press to prepare a composite sheet with a thickness of 400 - 600 μm; Among them, the ball milling environment is a water-cooled sandwich and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, the ball milling medium is zirconia balls, and the diameter of the zirconia balls is 3 - 5 mm; Step 2: Alternately lay 9 layers of desized basalt fiber plain weave fabrics and 10 layers of composite sheets, hot press, and anneal at 120 °C for 1 h to prepare basalt fiber composite materials; Among them, the upper and lower surfaces of the layup are composite sheets, the layup method of adjacent desized basalt fiber plain weave fabrics is symmetric layup with gradually changing angles, and the layup sequence is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0046] Comparative Example 2 Step 1: Place the desized basalt fiber plain weave fabric at 180 °C and 2 MPa for 5 h to obtain hydroxylated basalt fiber plain weave fabric; Step 2: Dissolve tannic acid with a content of 2 mg / mL in tris(hydroxymethyl)aminomethane solution with a pH of 8.5 to prepare a tannic acid solution. Disperse copper nanospheres with a concentration of 0.10 mg / mL in the tannic acid solution, and the modification time is 2 h to obtain tannic acid-modified copper nanospheres with a particle size range of 200 - 800 nm; Among them, the content of tris(hydroxymethyl)aminomethane is 10 mM, and the particle size range of the copper nanospheres is 100 - 500 nm; Under normal temperature and pressure, use the weighing method to measure the mass fraction of tannic acid in the tannic acid-modified copper nanospheres, and obtain that the mass fraction of tannic acid in the tannic acid-modified copper nanospheres is 0.11 wt%; Step 3: Filter and deposit the tannic acid-modified copper nanospheres on the surface of the hydroxylated basalt fiber plain weave fabric to obtain a basalt fiber plain weave fabric modified with copper nanospheres; Among them, the number of filtration times is two, and the filtration and deposition are carried out on the front and back sides of the hydroxylated basalt fiber plain weave fabric in turn; Under normal temperature and pressure, use the weighing method to measure the mass fraction of the tannic acid-modified copper nanospheres in the basalt fiber plain weave fabric modified with copper nanospheres, and obtain that the mass fraction of the tannic acid-modified copper nanospheres in the basalt fiber plain weave fabric modified with copper nanospheres is 0.70 wt%; Step 4: Ball mill and blend 30 g of polycarbonate for 6 h, and hot press to prepare a polycarbonate sheet with a thickness of 400 - 600 μm; Among them, the ball milling environment is a water-cooled sandwich and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, the ball milling medium is zirconia balls, and the diameter of the zirconia balls is 3 - 5 mm; Step 5: Alternately lay 9 layers of basalt fiber plain weave fabrics modified with copper nanospheres and 10 layers of polycarbonate sheets, hot press, and anneal at 120 °C for 1 h to prepare basalt fiber composite materials; Among them, the upper and lower surfaces of the ply are composite sheets, and the ply arrangement of adjacent basalt fiber plain fabrics modified with copper nanospheres is a symmetric ply with a gradually changing angle. The ply sequence is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0047] The basalt fiber plain fabric modified with copper nanospheres prepared in Steps 1, 2, and 3 of Example 1 was observed for its microscopic morphology, and the results are as Figure 2 shown.

[0048] Figure 2 It reveals that the surface of the basalt fiber plain fabric modified with copper nanospheres presents a uniform spherical morphology, indicating that the copper nanospheres modified with tannic acid are successfully deposited on the surface of the basalt fiber plain fabric. This is beneficial to the formation of a strong mechanical meshing effect between the basalt fiber and the polycarbonate matrix, thereby strengthening the interfacial bonding between the fiber and the polycarbonate matrix.

[0049] The unidirectional bending tests were performed on Example 1, Comparative Example 1, and Comparative Example 2, and the results are as Figure 3 shown.

[0050] Figure 3 It reveals that the bending strength of the basalt fiber composite prepared in Example 1 is 919 MPa, which is greater than the bending strengths of the basalt fiber composites prepared in Comparative Example 1 and Comparative Example 2. This is because the surface of the basalt fiber plain fabric modified with copper nanospheres becomes rough, increasing the mechanical meshing points between the fiber and the matrix; and the surface of the modified basalt fiber is rich in various active groups, which can be combined with the polycarbonate matrix through chemical bonds, hydrogen bonds, etc., improving the interfacial bonding between the fiber and the matrix; the copper nanospheres modified with tannic acid can build a transition layer at the interface between the basalt fiber and the polycarbonate matrix, which is beneficial to slowing down the modulus mutation from the basalt fiber to the polycarbonate matrix; at the same time, the matrix of the embedded composite sheet serves as the matrix of the basalt fiber composite, which can effectively reduce the incompatibility of heterogeneous materials and avoid the mechanical mismatch of the composite material. The combined action of these factors can effectively transfer the stress from the polycarbonate matrix to the basalt fiber, improving the mechanical properties of the basalt fiber composite.

[0051] The conductivity tests were performed on Example 1, Comparative Example 1, and Comparative Example 2, and the results are as Figure 4 shown.

[0052] Figure 4 It reveals that the transverse and longitudinal conductivities of the basalt fiber composite prepared in Example 1 are 5.0×10 - 2 S / m and 4.6×10 -3S / m, are all greater than the transverse and longitudinal electrical conductivities of the basalt fiber composites prepared in Comparative Example 1 and Comparative Example 2, indicating that a more complete conductive network is constructed in the basalt fiber composite in Example 1. This is because the copper nanospheres endow the basalt fiber plain weave fabric with conductivity and connect the conductive composite sheets, enabling the basalt fiber composite to form a three-dimensional conductive network structure that penetrates the transverse and longitudinal directions, thereby improving the electrical properties of the basalt fiber composite.

[0053] As described above, it is not intended to impose any formal restrictions on the present invention. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can, within the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments by using the technical content disclosed above. However, as long as the content does not depart from the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A preparation method of a longitudinally conductive basalt fiber composite material, characterized in that, It includes the following steps: S1. Place the desized basalt fiber plain fabric in a high-temperature and high-pressure water environment for treatment to obtain a hydroxylated basalt fiber plain fabric; S2. Dissolve tannic acid in a tris(hydroxymethyl)aminomethane solution to prepare a tannic acid solution, and disperse metal nanoparticles in the tannic acid solution to obtain tannic acid-modified metal nanoparticles; S3. Deposit the tannic acid-modified metal nanoparticles obtained in S2 on the surface of the hydroxylated basalt fiber plain fabric obtained in S1 to obtain a basalt fiber plain fabric modified with metal nanoparticles; S4. Disperse the conductive filler, blend it with polycarbonate, and hot-press to prepare a composite sheet; S5. Lay the basalt fiber plain fabric modified with metal nanoparticles obtained in S3 and the composite sheet obtained in S4, hot-press, and anneal to prepare a basalt fiber composite material.

2. The preparation method of a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that, In S1, the high temperature is 150 - 220 °C, the high pressure is 2 MPa, and the treatment time is 5 h.

3. The preparation method of a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that, In S2, the content of tannic acid is 1 - 5 mg / mL; the pH of the tris(hydroxymethyl)aminomethane solution is 8.3 - 8.7, and the content of tris(hydroxymethyl)aminomethane is 10 - 40 mM; the metal nanoparticles are one of metal nanospheres, metal nanowires, and metal nanosheets; the particle size range of the metal nanoparticles is 100 - 500 nm; the concentration of the metal nanoparticles is 0.05 - 0.20 mg / mL, and the modification time is 2 h; the particle size range of the tannic acid-modified metal nanoparticles is 200 - 800 nm; the mass fraction of tannic acid in the tannic acid-modified metal nanoparticles is 0.09 - 0.12 wt%.

4. The preparation method of a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that, In S3, the deposition method is suction filtration deposition, and the number of suction filtration times is two. Suction filtration deposition is carried out on the front and back of the hydroxylated basalt fiber plain fabric in sequence; the mass fraction of the tannic acid-modified metal nanoparticles in the basalt fiber plain fabric modified with metal nanoparticles is 0.50 - 0.80 wt%.

5. The preparation method of a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that, In S4, the conductive filler is a mixture of carbon fiber powder, carbon nanotubes, and transition metal carbonitrides. Among them, the mass ratio of carbon fiber powder, carbon nanotubes, and transition metal carbonitrides is 6:3:1; the dispersion method is ball milling dispersion, and the dispersion time is 10 h; the mass ratio of the conductive filler to polycarbonate is 3:97; the blending method is ball milling blending, and the blending time is 6 h; the thickness of the composite sheet is 400 - 600 μm.

6. The preparation method of a longitudinally conductive basalt fiber composite material according to claim 5, characterized in that, The ball milling environment is a water-cooled sandwich and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, the ball milling medium is zirconia balls, and the diameter of the zirconia balls is 3 - 5 mm.

7. The preparation method of a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that, In S5, the laying method is alternating laying. The number of layers of the composite sheet is 10, the number of layers of the basalt fiber plain fabric modified with metal nanoparticles is 9, and the upper and lower surfaces are composite sheets; the laying method of adjacent basalt fiber plain fabrics modified with metal nanoparticles is symmetric laying with a gradually changing angle, and the laying sequence is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°; the annealing temperature is 120 °C, and the time is 1 h.

8. A longitudinally conductive basalt fiber composite according to claim 1, characterized in that: Prepared by the preparation method of a longitudinally conductive basalt fiber composite material according to any one of claims 1-7.

9. The longitudinally conductive basalt fiber composite material according to claim 8, characterized in that, The mass fraction of basalt fibers in the basalt fiber composite is 58 - 63 wt%; the density of the basalt fiber composite is 1.80 - 1.85 g / cm 3 , the porosity is 3.6 - 4.4%; the flexural strength of the basalt fiber composite is 810 - 960 MPa; the basalt fiber composite has a hierarchical conductive network structure; the transverse conductivity of the basalt fiber composite is 2.0 - 7.0×10 -2 S / m, and the longitudinal conductivity is 3.7 - 6.2×10 -3 S / m.

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