Electrothermal fiber fabric based on carbon fiber pre-oxidized yarn and preparation method and application thereof

Abstract

The application discloses a kind of electric heating fiber fabric based on carbon fiber pre-oxidized yarn and its preparation method and application, belong to functional fabric material technical field, including the following steps: carbon fiber pre-oxidized yarn cloth is pretreated;The carbon fiber pre-oxidized yarn cloth after pretreatment is fixed on substrate, the laser focal point of laser is located on the horizontal plane of carbon fiber pre-oxidized yarn cloth, according to preset pattern path laser direct writing is carried out, the surface of carbon fiber pre-oxidized yarn cloth is carbonized using the photo-thermal effect of laser, and the patterned conductive graphene layer is formed in situ, wherein the laser power is 3~30 W, the scanning speed is 10~1260 mm / s, the electric heating fiber fabric and its preparation method directly construct integral conductive graphene layer on the surface of carbon fiber pre-oxidized yarn cloth using laser induction technology, overcome the problems of existing technology in processability, cost and performance uniformity, and can be used in electric heating deicing field.

Description

Technical Field

[0001] This invention belongs to the field of functional fabric materials technology, and relates to an electrothermal fiber fabric based on carbon fiber pre-oxidized yarn, its preparation method and application. Background Technology

[0002] As a key precursor to carbon fiber, pre-oxidized carbon fiber fabric not only possesses excellent thermal stability but also exhibits unique advantages in composite material preparation due to its retention of the softness and toughness of the precursor stage. Its good lay-up properties allow it to conform well to complex curved surfaces such as aircraft wings and wind turbine blades, and it demonstrates excellent wettability and interfacial bonding with common aerospace and wind power resin matrices such as epoxy resin, making it an ideal structural reinforcement material.

[0003] In recent years, with the development of "structure-function integration" in fields such as aerospace and wind power, the demand for composite materials integrating electrothermal functions such as heating and de-icing has become increasingly urgent. Carbon fiber pre-oxidized filament cloth exhibits good compatibility with the matrix structure and preparation process of composite materials and possesses a certain degree of heat resistance, making it an ideal flexible carrier for achieving such integration. However, without specialized conductive modification treatment, it inherently exhibits extremely high resistivity, making it difficult to directly meet the requirements of electrothermal conversion applications.

[0004] Laser processing technology offers the possibility of achieving efficient and precise surface modification of materials. Existing research provides directions for the functionalization of similar materials. Lin et al., in "Nature Communications, 2014, 5: 5714," demonstrated the feasibility of laser-induced conductive graphene formation by laser scanning of polyimide polymer films and inducing the formation of such structures on their surfaces. Chinese patent CN114716717A proposes a method using infrared picosecond laser negative defocusing to irradiate aramid fiber resin-based composite materials. Without damaging the surface resin, the laser penetrates the resin layer to selectively carbonize the internal aramid fibers, forming conductive circuits. However, this method is designed for aramid fiber and resin composite systems and is not applicable to the pre-oxidized filament fabrics of this invention; furthermore, the process objectives and conditions differ significantly.

[0005] Chinese patent CN101691684A discloses a method for preparing carbon fiber materials by heating and carbonizing needle-punched pre-oxidized filaments in a carbonization furnace at a certain rate. Although this process can convert pre-oxidized filament fabric into a conductive material, it is energy-intensive, time-consuming, and easily leads to a decrease in the overall flexibility of the fabric. In addition, this process cannot selectively control the conductive areas, significantly increasing energy consumption in applications.

[0006] Therefore, it is necessary to develop a new laser surface modification method specifically for pre-oxidized filament fabrics to address the shortcomings of traditional carbonization processes in terms of efficiency, flexibility retention, and controllability, and to overcome the inapplicability of existing laser technology to pre-oxidized filament fabric systems. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an electrothermal fiber fabric based on carbon fiber pre-oxidized filament, its preparation method and application. The electrothermal fiber fabric and its preparation method directly construct an integral conductive graphene layer on the surface of the carbon fiber pre-oxidized filament fabric using laser-induced technology, overcoming the problems of the prior art in terms of processability, cost and performance uniformity. At the same time, it can be used in the field of electrothermal anti-icing.

[0008] To achieve the above objectives, this invention discloses a method for preparing an electrothermal fiber fabric based on carbon fiber pre-oxidized filament, comprising the following steps: Pre-treatment of carbon fiber pre-oxidized filament cloth; The pretreated carbon fiber pre-oxidized filament cloth is fixed on the substrate. The laser focus of the laser is located on the horizontal plane of the carbon fiber pre-oxidized filament cloth. Laser direct writing is performed according to the preset pattern path. The photothermal effect of the laser is used to carbonize the surface of the carbon fiber pre-oxidized filament cloth, forming a patterned conductive graphene layer in situ. The laser power is 3~30 W and the scanning speed is 10~1260 mm / s.

[0009] Furthermore, the pretreatment process for the carbon fiber pre-oxidized filament cloth is as follows: The carbon fiber pre-oxidized filaments were cleaned in a cleaning solvent and then dried.

[0010] Furthermore, the cleaning solvent is one or a mixture of several of ethanol, isopropanol, and acetone.

[0011] Furthermore, the drying method is either air drying or heating drying.

[0012] Furthermore, the carbon fiber pre-oxidized filament cloth is a polyacrylonitrile-based carbon fiber pre-oxidized filament cloth with an areal density of 50–400 g / m². 2 The thickness ranges from 0.05 to 0.5 mm.

[0013] Furthermore, the laser is a CO2 laser or a fiber laser; the diameter of the laser direct writing spot ranges from 10 μm to 2 mm.

[0014] Furthermore, the preset graphic paths include serpentine interlacing scan, unidirectional scan, and gridded scan.

[0015] Furthermore, the sheet resistance of the laser processing area can be adjusted within the range of 10–3000 Ω / □.

[0016] This invention discloses an electrothermal fiber fabric based on carbon fiber pre-oxidized filament, which is prepared by the method for preparing the electrothermal fiber fabric based on carbon fiber pre-oxidized filament.

[0017] This invention discloses the application of an electrothermal fiber fabric based on carbon fiber pre-oxidized yarn in the field of electrothermal anti-icing and de-icing.

[0018] The present invention has the following beneficial effects: The electrothermal fiber fabric based on carbon fiber pre-oxidized filament, its preparation method, and its application, as described in this invention, involve in-situ functional modification of the surface of polyacrylonitrile-based carbon fiber pre-oxidized filament fabric using laser-induced technology. The specific implementation process can be divided into two stages: First, under the directional irradiation of a CO2 laser, the surface of the pre-oxidized filament fabric rapidly absorbs laser energy and undergoes photothermal conversion, causing a significant increase in surface temperature within a very short time. This triggers a pyrolysis reaction in the surface material, accompanied by the removal of non-carbon elements and the escape of small molecule gases, providing a structural basis for subsequent carbonization reactions. Subsequently, as the pyrolysis process progresses, the carbon skeleton on the surface of the pre-oxidized filament fabric undergoes rearrangement and localized ordering, gradually forming a graphene layer. This constructs a conductive network structure on the fiber surface, thereby significantly improving the conductivity of the pre-oxidized filament fabric. This method constructs a highly conductive and stable graphene layer on the surface of the carbon fiber pre-oxidized filament fabric, endowing it with electrothermal functionality. The above preparation process is simple and can be carried out in situ under normal temperature and pressure air, without the need for additional reaction chambers or ambient atmosphere control. The process causes minimal damage to the pre-oxidized fiber cloth, imparting electrothermal functionality without excessively compromising its mechanical properties. By adjusting the laser process parameters to induce the formation of a conductive layer on the surface, the surface resistance is reduced to a controllable range for electrothermal applications. Testing has verified that the resulting carbon fiber pre-oxidized fiber cloth with a conductive layer, when embedded in glass fiber / epoxy resin composite materials, can achieve steady-state heating. This, while preserving its excellent intrinsic properties as a composite material reinforcement to the maximum extent, endows it with superior electrothermal conversion capabilities, providing a new solution for flexible electrothermal materials and electrothermal de-icing applications. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the electrothermal fiber fabric prepared based on carbon fiber pre-oxidized filament after laser treatment in Example 1; Figure 2a This is a surface morphology diagram of the carbon fiber pre-oxidized precursor fiber in Example 1; Figure 2b This is a surface morphology diagram of the fiber after laser treatment in Example 1; Figure 3 The Raman spectrum of the laser region on the surface of the electrothermal fiber fabric prepared based on carbon fiber pre-oxidized filament in Example 1 is shown in Figure I. D / I G The decrease in carbon content from 1.03 in the original pre-oxidized filament fabric to 0.27 after laser treatment indicates a transformation in the surface carbon structure of the pre-oxidized filament towards order, generating a carbon structure with sp... 2 A graphene conductive layer primarily composed of hybrid carbon; Figure 4 The image shows a comparison of the sheet resistance of the electrothermal fiber fabric prepared based on carbon fiber pre-oxidized filament after laser treatment in Example 1, and the original pre-oxidized filament fabric. It can be seen that the sheet resistance decreased significantly after laser treatment, from about 50,000 Ω / □ to 44.3 Ω / □, and the conductivity was greatly improved. Figure 5a The image shows a physical picture of the electrothermal fiber fabric based on carbon fiber pre-oxidized filament embedded in glass fiber / epoxy resin composite material prepared in Example 1. Figure 5b This is a cross-sectional schematic diagram of the electrothermal fiber fabric based on carbon fiber pre-oxidized filament embedded in glass fiber / epoxy resin composite material prepared in Example 1. Figure 6 The image shows the infrared analysis of the heating temperature after applying a 10 V DC voltage for 60 s to an electrothermal fiber fabric based on carbon fiber pre-oxidized filament prepared in Example 1 and embedding it into a glass fiber / epoxy resin composite material. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0023] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0024] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0025] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0026] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0029] The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to the present invention includes the following steps: 1) The carbon fiber pre-oxidized filaments were cleaned in a solvent and then dried; 2) Fix the dried carbon fiber pre-oxidized filament cloth onto the substrate, and position the laser focus on the horizontal plane of the carbon fiber pre-oxidized filament cloth. Perform laser direct writing according to the preset pattern path. Utilize the photothermal effect of the laser to carbonize the surface of the carbon fiber pre-oxidized filament cloth and form a patterned conductive graphene layer in situ.

[0030] In this embodiment, the carbon fiber pre-oxidized filament cloth is a polyacrylonitrile-based carbon fiber pre-oxidized filament cloth with an areal density of 50–400 g / m². 2 The thickness ranges from 0.05 to 0.5 mm.

[0031] In this embodiment, the cleaning solvent is one or a mixture of several of ethanol, isopropanol and acetone; the drying method is natural air drying or heating drying.

[0032] In this embodiment, the laser is a CO2 laser or a fiber laser; the diameter of the laser direct writing spot ranges from 10 μm to 2 mm.

[0033] In this embodiment, a laser power of 3~30 W and a scanning speed of 10~1260 mm / s are used to perform laser scanning on carbon fiber pre-oxidized filament cloth.

[0034] In this embodiment, the preset pattern path includes serpentine interlaced scanning, unidirectional scanning, and gridded scanning, which can prepare conductive graphene layers with arbitrary patterns according to requirements.

[0035] In this embodiment, the sheet resistance of the laser processing area can be adjusted within the range of 10 to 3000 Ω / □.

[0036] The electrothermal fiber fabric prepared by this invention can be used on the surfaces of key components that are prone to icing and require efficient and low-energy de-icing, such as aircraft wings, engine air intakes, and wind turbine blades.

[0037] Example 1 The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filaments described in this embodiment includes the following steps: The carbon fiber pre-oxidized fabric was cut into 90 mm × 90 mm samples, immersed in anhydrous ethanol solution for 5 minutes, and then air-dried naturally to obtain a clean carbon fiber pre-oxidized fabric.

[0038] The pre-oxidized carbon fiber cloth, after being washed and dried, is fixed onto a glass substrate to prevent warping and shrinkage of the fabric during laser induction.

[0039] In an air environment, the sample was placed on a 10.6 μm CO2 laser platform and directly laser scanned. The laser power was 9 W, the scanning speed was 126 mm / s, the number of laser scans was 1, and the energy density was 56.2 J / cm². 2 Laser-induced carbonization of carbon fiber pre-oxidized filament fabric forms a conductive layer on its surface.

[0040] like Figure 3 As shown, by comparing the Raman spectral characteristics of the laser-treated and untreated areas on the surface of the pre-oxidized carbon fiber fabric, it can be found that the laser-treated area exhibits better performance at 1350 cm⁻¹. -1 (D peak), 1580 cm -1 (G peak) and 2700 cm -1 The characteristic Raman signal at the (2D peak) is significantly enhanced and I D with I G The ratio decreased from 1.03 to 0.27, indicating that a graphene conductive layer was formed on the carbon fiber pre-oxidized filament substrate after laser irradiation with specific parameters.

[0041] After the prepared sample is mounted on the copper foil electrode, as follows: Figure 1 As shown, it is embedded into a glass fiber / epoxy resin composite material using a vacuum resin infusion process, such as... Figure 5a and Figure 5b As shown, the resistance across its electrodes was 86.9 Ω, and after maintaining a 10V operating voltage for 60 seconds, the highest temperature at the center reached 40.4℃. Figure 6 As shown, it demonstrates excellent electrothermal capabilities and has application value in the field of electrothermal de-icing.

[0042] Example 2 The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filaments described in this embodiment includes the following steps: The carbon fiber pre-oxidized fabric was cut into 100 mm × 100 mm samples, immersed in anhydrous ethanol solution for 5 minutes, and then air-dried naturally to obtain a clean and uncontaminated carbon fiber pre-oxidized fabric.

[0043] The pre-oxidized carbon fiber filaments, after being cleaned and dried, were placed on a heating table and heat-treated at 200°C for 30 minutes to eliminate internal thermal stress. Subsequently, they were flattened and fixed onto a glass substrate to prevent warping and deformation of the fabric during the subsequent laser-induced process.

[0044] In an air environment, the sample was placed on a 10.6 μm CO2 laser platform, and a 30 mm × 30 mm area was designed for direct laser scanning. The laser power was 12 W, the scanning speed was 126 mm / s, the number of laser scans was 1, and the energy density was 74.9 J / cm².2 Laser-induced carbonization of carbon fiber pre-oxidized filament fabric forms a graphene conductive layer on its surface, giving it electrothermal properties.

[0045] After the prepared sample was fitted with copper electrodes and embedded in a glass fiber / epoxy resin composite material, the resistance across the electrodes was measured to be 63.1 Ω. Under a working voltage of 10 V for 60 s, the maximum temperature reached 93.5 ℃, demonstrating good electrothermal capabilities and potential application value in the field of electrothermal de-icing.

[0046] Example 3 The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filaments described in this embodiment includes the following steps: The carbon fiber pre-oxidized fabric was cut into 100 mm × 100 mm samples, immersed in acetone solution and ultrasonically cleaned for 3 minutes, and then taken out and air-dried naturally.

[0047] The pre-oxidized carbon fiber cloth, after being washed and dried, is fixed onto a glass substrate to prevent warping and shrinkage of the fabric during laser induction.

[0048] In an air environment, the sample was placed in a 10.6 μm CO2 laser platform and directly laser scanned. The laser power was 12 W, the scanning speed was 630 mm / s, the number of scans was 3, and the cumulative energy density was 45 J / cm².

[0049] After the prepared sample was fitted with copper electrodes, it was embedded in a glass fiber / epoxy resin composite material. Testing showed that the resistance across the electrodes was 79.8 Ω. When a 10 V DC voltage was applied, the surface temperature rose to approximately 48.2 °C within 60 seconds, demonstrating excellent electrothermal performance and suitability for flexible heating and de-icing applications.

[0050] Example 4 The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to the present invention includes the following steps: 1) The carbon fiber pre-oxidized filaments were cleaned in a solvent and then dried; 2) Fix the dried carbon fiber pre-oxidized filament cloth onto the substrate, and position the laser focus on the horizontal plane of the carbon fiber pre-oxidized filament cloth. Perform laser direct writing according to the preset pattern path. Utilize the photothermal effect of the laser to carbonize the surface of the carbon fiber pre-oxidized filament cloth and form a patterned conductive graphene layer in situ.

[0051] In this embodiment, the carbon fiber pre-oxidized filament cloth is a polyacrylonitrile-based carbon fiber pre-oxidized filament cloth with an areal density of 50 g / m². 2 The thickness is 0.05mm.

[0052] In this embodiment, the cleaning solvent is ethanol; the drying method is natural air drying.

[0053] In this embodiment, the laser is a fiber laser; the diameter of the laser direct writing spot is 10 μm.

[0054] In this embodiment, a laser power of 3 W and a scanning speed of 10 mm / s are used to perform laser scanning on carbon fiber pre-oxidized filament cloth.

[0055] In this embodiment, the preset graphic path includes a serpentine interlaced scan.

[0056] In this embodiment, the sheet resistance of the laser processing area can be adjusted within the range of 1~10 Ω / □.

[0057] Example 5 The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to the present invention includes the following steps: 1) The carbon fiber pre-oxidized filaments were cleaned in a solvent and then dried; 2) Fix the dried carbon fiber pre-oxidized filament cloth onto the substrate, and position the laser focus on the horizontal plane of the carbon fiber pre-oxidized filament cloth. Perform laser direct writing according to the preset pattern path. Utilize the photothermal effect of the laser to carbonize the surface of the carbon fiber pre-oxidized filament cloth and form a patterned conductive graphene layer in situ.

[0058] In this embodiment, the carbon fiber pre-oxidized filament cloth is a polyacrylonitrile-based carbon fiber pre-oxidized filament cloth with an areal density of 400 g / m². 2 The thickness is 0.5 mm.

[0059] In this embodiment, the cleaning solvent is isopropanol; the drying method is heating and drying.

[0060] In this embodiment, the laser is a CO2 laser; the diameter of the laser direct writing spot is 2 mm.

[0061] In this embodiment, a laser power of 30 W and a scanning speed of 1260 mm / s are used to perform laser scanning on carbon fiber pre-oxidized filament cloth.

[0062] In this embodiment, the preset graphic path includes unidirectional scanning.

[0063] In this embodiment, the sheet resistance of the laser processing area can be adjusted within the range of 1000~3000 Ω / □.

[0064] Example 6 The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to the present invention includes the following steps: 1) The carbon fiber pre-oxidized filaments were cleaned in a solvent and then dried; 2) Fix the dried carbon fiber pre-oxidized filament cloth onto the substrate, and position the laser focus on the horizontal plane of the carbon fiber pre-oxidized filament cloth. Perform laser direct writing according to the preset pattern path. Utilize the photothermal effect of the laser to carbonize the surface of the carbon fiber pre-oxidized filament cloth and form a patterned conductive graphene layer in situ.

[0065] In this embodiment, the carbon fiber pre-oxidized filament cloth is a polyacrylonitrile-based carbon fiber pre-oxidized filament cloth with an areal density of 200 g / m². 2 The thickness is 0.3 mm.

[0066] In this embodiment, the cleaning solvent is acetone; the drying method is natural air drying.

[0067] In this embodiment, the laser is a CO2 laser; the diameter of the laser direct writing spot is 1 mm.

[0068] In this embodiment, a laser power of 20 W and a scanning speed of 600 mm / s are used to perform laser scanning on carbon fiber pre-oxidized filament cloth.

[0069] In this embodiment, the preset graphic path includes a gridded scan.

[0070] In this embodiment, the sheet resistance of the laser processing area can be adjusted within the range of 500~1500 Ω / □.

[0071] Example 7 The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to the present invention includes the following steps: 1) The carbon fiber pre-oxidized filaments were cleaned in a solvent and then dried; 2) Fix the dried carbon fiber pre-oxidized filament cloth onto the substrate, and position the laser focus on the horizontal plane of the carbon fiber pre-oxidized filament cloth. Perform laser direct writing according to the preset pattern path. Utilize the photothermal effect of the laser to carbonize the surface of the carbon fiber pre-oxidized filament cloth and form a patterned conductive graphene layer in situ.

[0072] In this embodiment, the carbon fiber pre-oxidized filament cloth is a polyacrylonitrile-based carbon fiber pre-oxidized filament cloth with an areal density of 50 g / m². 2 The thickness is 0.5 mm.

[0073] In this embodiment, the cleaning solvent is a mixture of ethanol, isopropanol and acetone; the drying method is natural air drying.

[0074] In this embodiment, the laser is a CO2 laser; the diameter of the laser direct writing spot is 2 mm.

[0075] In this embodiment, a laser power of 30 W and a scanning speed of 10 mm / s are used to perform laser scanning on carbon fiber pre-oxidized filament cloth.

[0076] In this embodiment, the preset graphic path includes a gridded scan.

[0077] In this embodiment, the sheet resistance of the laser processing area can be adjusted within the range of 1000~3000 Ω / □.

[0078] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0079] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

[0080] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing an electrothermal fiber fabric based on carbon fiber pre-oxidized filament, characterized in that, Includes the following steps: Pre-treatment of carbon fiber pre-oxidized filament cloth; The pretreated carbon fiber pre-oxidized filament cloth is fixed on the substrate. The laser focus of the laser is located on the horizontal plane of the carbon fiber pre-oxidized filament cloth. Laser direct writing is performed according to the preset pattern path. The photothermal effect of the laser is used to carbonize the surface of the carbon fiber pre-oxidized filament cloth, forming a patterned conductive graphene layer in situ. The laser power is 3~30 W and the scanning speed is 10~1260 mm / s.

2. The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to claim 1, characterized in that, The pretreatment process for the carbon fiber pre-oxidized filament cloth is as follows: The carbon fiber pre-oxidized filaments were cleaned in a cleaning solvent and then dried.

3. The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to claim 2, characterized in that, The cleaning solvent is one or a mixture of several of ethanol, isopropanol and acetone.

4. The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to claim 2, characterized in that, The drying method is either air drying or heating drying.

5. The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to claim 1, characterized in that, The carbon fiber pre-oxidized filament cloth is a polyacrylonitrile-based carbon fiber pre-oxidized filament cloth with an areal density of 50–400 g / m². 2 The thickness ranges from 0.05 to 0.5 mm.

6. The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to claim 1, characterized in that, The laser is a CO2 laser or a fiber laser; the diameter of the laser direct writing spot ranges from 10 μm to 2 mm.

7. The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to claim 1, characterized in that, The preset graphic paths include serpentine scanning, unidirectional scanning, and gridded scanning.

8. The method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament according to claim 1, characterized in that, The sheet resistance of the laser processing area can be adjusted from 10 to 3000 Ω / □.

9. An electrothermal fiber fabric based on carbon fiber pre-oxidized filament, characterized in that, It is prepared according to the method for preparing electrothermal fiber fabric based on carbon fiber pre-oxidized filament as described in any one of claims 1-8.

10. The application of the electrothermal fiber fabric based on carbon fiber pre-oxidized yarn as described in claim 9 in the field of electrothermal de-icing.

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