A biomass-based fiber composite material and its preparation method and application

Abstract

The present invention provides a biomass-based fiber composite material, its preparation method, and application. This method processes cedar to extract fibers, subjecting the cedar stems to a high-temperature pyrolysis reaction in a gasifier to obtain a silicon-carbon material. The extracted fibers are mixed with the silicon-carbon material via a surface coating method, followed by drying, compacting, curing, and spinning into raw yarn. The raw yarn is then woven into cloth, and the cloth is molded to the desired product size based on the performance requirements of different products. This method fully utilizes the high strength, moisture absorption and dehumidification properties, thermal insulation, and sound insulation of cedar fibers, and combines them with the silicon-carbon material made from cedar stems, which is then mixed, dried, and pressed. The composite material, due to its carbon content, is wear-resistant and also exhibits antistatic and odor-eliminating properties.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and in particular to a biomass-based fiber composite material and a preparation method and application thereof. Background Art

[0002] With the continuous development of the automotive industry, environmental issues have become increasingly prominent, especially for materials inside the car that are in direct contact with drivers and passengers. In existing technologies, most interior trim parts are made of plastic materials such as PVC, PS, and PP (polypropylene resin). Such industrial plastics are heavily dependent on non-renewable resources such as petroleum. Not only are they not environmentally friendly, but the odors they emit often contain certain ingredients that are harmful to the human body. They do not meet regulatory requirements, and long-term contact will damage human health.

[0003] Based on the defects of the current plastics such as PVC, PS, PP (i.e. polypropylene resin) used in automobile interior parts, it is necessary to improve them. Summary of the Invention

[0004] In view of this, the present invention provides a biomass-based fiber composite material and its application to solve the defects in the prior art.

[0005] In a first aspect, the present invention provides a method for preparing a biomass-based fiber composite material, comprising the following steps:

[0006] Soak the cypress stem skin in a sodium hydroxide solution;

[0007] Add sodium silicate degumming agent to the soaked cypress stalk skin and cook it at 120-160℃ to decompose the colloid in the fiber;

[0008] adding a solution containing sodium sulfite and compound sodium phosphate to the surface of the steamed cypress stalk to obtain cypress fiber;

[0009] The ceramie fiber is added to a bulking agent containing a metal oxide and subjected to bulking and fluffing treatment at 35-60°C;

[0010] adding a qualitative agent to the expanded ceramsite fiber;

[0011] Drying the cypress fiber after characterization;

[0012] The cypress stalks are subjected to high-temperature pyrolysis reaction to obtain silicon-carbon material;

[0013] Grinding the silicon-carbon material into powder to obtain carbon powder;

[0014] The carbon powder and polypropylene resin are mixed, ethanol is added as a solvent, polyacrylate is added as a dispersant, and the mixture is stirred to obtain a slurry;

[0015] The slurry is coated on the surface of dry cypress fiber, solidified, and spun into fiber strands;

[0016] The fiber strands are woven into fiber cloth through a weaving process.

[0017] Preferably, the cypress stalk skin is soaked in a sodium hydroxide solution for 30 to 60 hours, wherein the mass concentration of the sodium hydroxide solution is 15 to 20 g / L.

[0018] Preferably, sodium silicate degumming agent is added to the soaked cypress stalk skin, and in the step of steaming at 120-160° C., the steaming time is 4-8 hours, and the sodium silicate is added in the form of sodium silicate solution, and the concentration of the sodium silicate solution is 2-4 g / L.

[0019] Preferably, a solution containing sodium sulfite and composite sodium phosphate is added to the boiled flax stem skin, and the mixture is allowed to stand for 20 to 30 hours to obtain flax fiber;

[0020] The preparation method of the solution containing sodium sulfite and compound sodium phosphate is as follows: sodium sulfite and compound sodium phosphate are added into water to obtain the solution containing sodium sulfite and compound sodium phosphate, wherein the concentration of sodium sulfite is 1-4 g / L and the concentration of compound sodium phosphate is 1-4 g / L.

[0021] Preferably, the fiber is added to a bulking agent containing a metal oxide and subjected to bulking and combing treatment at 35-60° C., and the bulking and combing treatment time is 2-3 hours; the bulking agent is prepared by adding MgO to water to obtain the bulking agent, wherein the concentration of MgO is 10-15 g / L.

[0022] Preferably, a qualitative agent is added to the expanded bast fiber and treated at 25-30°C for 25-30 minutes, wherein the qualitative agent is prepared by adding CuCl2 to ammonia water to obtain a copper ammonia solution, which is the qualitative agent; the copper ion concentration in the copper ammonia solution is 0.5-1.5 mol / L.

[0023] Preferably, the cypress stalks are subjected to a high-temperature pyrolysis reaction to obtain a silicon-carbon material, which specifically includes the following steps:

[0024] Pyrolyze cypress stems at 600-700°C for 2-4 hours under an inert atmosphere to obtain silicon-carbon material;

[0025] The inert atmosphere includes at least one of nitrogen, helium, neon and argon;

[0026] In the step of mixing carbon powder and polypropylene resin, the mass ratio of carbon powder to polypropylene resin is 1:(1-3), the mass ratio of carbon powder to solvent ethanol is 1:(38-42), and the mass ratio of carbon powder to dispersant polyacrylate is (40-42):1.

[0027] In a second aspect, the present invention further provides a biomass-based fiber composite material prepared by the above-mentioned preparation method.

[0028] In a third aspect, the present invention further provides a biomass-based fiber composite material prepared by the preparation method or the use of the biomass-based fiber composite material in the preparation of automotive interior trims.

[0029] Preferably, a biomass-based fiber composite material is placed in a mold, and then a polypropylene resin is laid on the biomass-based fiber composite material, and then the biomass-based fiber composite material is laid on the polypropylene resin again, and the operation is repeated so that the biomass-based fiber composite material and the polypropylene resin are alternately arranged in sequence; then softened at a temperature of 200-220°C for 3-7 minutes, and finally maintained at a pressure of 12.5-15 MPa for 60-80 seconds to obtain an automotive interior part.

[0030] The biomass-based fiber composite material of the present invention, its preparation method, and its application have the following beneficial effects compared with the prior art:

[0031] The method of the biomass-based fiber composite material of the present invention can fully utilize the high strength, moisture absorption and dehumidification, heat insulation, sound insulation and other properties of the cedar fiber by processing the cedar fiber material, and combine it with the silicon-carbon material made of cedar stems, mix and dry it, and press it. The composite material has wear resistance due to the carbon element, and also has the functions of anti-static and odor elimination. When the composite material prepared by the present invention is used as the lower baffle of the air-conditioning box in the car, the cross section of the cedar fiber under the electron microscope has a multi-level pore activated carbon material with micropores and macropores interconnected. The porous feature has strong adsorption, quickly absorbs and evaporates moisture, is beneficial to keep the lower baffle in a dry state, and can also absorb noise inside the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0033] Figure 1 This is a SEM image of the slurry coated on the surface of dry cedar fiber in step S10 of Example 1 and cured at room temperature;

[0034] Figure 2 This is a SEM image of the carbon powder prepared in step S8 of Example 1;

[0035] Figure 3This is a physical picture of an automobile interior decoration part (specifically, an air conditioning box lower baffle) prepared by the preparation method of Example 1;

[0036] Figure 4 This is a SEM image of the cedar fiber in step S6 of Example 1;

[0037] Figure 5 This is a physical picture of the carbon powder prepared in step S8 of Example 1. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments. In addition, in the description of this application, the term "including" means "including but not limited to". Various embodiments of the present invention may be in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be understood as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the numbered ranges, such as 1, 2, 3, 4, 5 and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited numbers (fractions or integers) within the indicated range.

[0040] The present invention provides a method for preparing a biomass-based fiber composite material, comprising the following steps:

[0041] S1. Soak the cypress stem skin in a sodium hydroxide solution;

[0042] S2. Adding sodium silicate degumming agent to the soaked cypress stalk skin, and steaming at 120-160° C. to decompose the colloid in the fiber;

[0043] S3, adding a solution containing sodium sulfite and composite sodium phosphate to the boiled cypress stalk skin to obtain cypress fiber;

[0044] S4, adding the ceramie fiber to a bulking agent containing a metal oxide and subjecting it to bulking and fluffing treatment at 35-60° C.;

[0045] S5. adding a qualitative agent to the expanded ceramsite fiber;

[0046] S6. drying the cypress fiber after the qualitative treatment;

[0047] S7, subjecting the cypress stalks to a high-temperature pyrolysis reaction to obtain a silicon-carbon material;

[0048] S8, grinding the silicon-carbon material into powder to obtain carbon powder;

[0049] S9, mixing carbon powder and polypropylene resin, then adding ethanol as a solvent, and then adding polyacrylate as a dispersant, stirring to obtain a slurry;

[0050] S10, coating the slurry on the surface of dry cypress fiber, curing at room temperature, and weaving into fiber precursor;

[0051] S11, weaving the fiber raw yarn into fiber cloth through a weaving process.

[0052] In some embodiments, the cypress stalk skin is soaked in a sodium hydroxide solution (specifically, an aqueous sodium hydroxide solution) for 30 to 60 hours, and the mass concentration of the sodium hydroxide solution is 15 to 20 g / L.

[0053] In some embodiments, cypress stalks are taken, branches, leaves and surface impurities are removed, and the surface of the cypress stalks is cleaned and cut into 3 to 5 cm long pieces.

[0054] In some embodiments, sodium silicate degumming agent is added to the soaked cypress stalk skin, and in the step of steaming at 120-160° C., the steaming time is 4-8 hours; sodium silicate is added in the form of sodium silicate solution (aqueous solution), and the concentration of the sodium silicate solution is 2-4 g / L.

[0055] In some embodiments, a solution containing sodium sulfite and complex sodium phosphate is added to the boiled cypress stalk skin, and the mixture is allowed to stand at room temperature (23±2° C.) for 20 to 30 hours to obtain cypress fiber.

[0056] In some embodiments, the preparation method of the solution containing sodium sulfite and compound sodium phosphate is: adding sodium sulfite and compound sodium phosphate to water to obtain a solution containing sodium sulfite and compound sodium phosphate, wherein the concentration of sodium sulfite is 1 to 4 g / L and the concentration of compound sodium phosphate is 1 to 4 g / L.

[0057] In some embodiments, the fiber is added to a bulking agent containing a metal oxide and subjected to a bulking and combing treatment at 35-60° C., and the bulking and combing treatment time is 2-3 hours. The bulking agent is prepared by adding MgO to water to obtain the bulking agent, wherein the concentration of MgO is 10-15 g / L.

[0058] In some embodiments, a qualitative agent is added to the expanded bast fiber and treated at 25-30°C for 25-30 minutes, wherein the qualitative agent is prepared by adding CuCl2 to ammonia water to obtain a copper ammonia (Cu(NH3)4](OH)2) solution, which is the qualitative agent; the copper ion concentration in the copper ammonia solution is 0.5-1.5 mol / L.

[0059] In some embodiments, in the step of drying the characterized flax fibers, the breaking strength of a single flax fiber is 5.2 to 6.9 cN / dtex (centinewtons per dtex, a unit of breaking strength, the maximum tensile force a fiber can withstand), and the breaking elongation is 8 to 10%.

[0060] In some embodiments, cypress straw is subjected to a high-temperature pyrolysis reaction to obtain a silicon-carbon material, which specifically includes the following steps:

[0061] Pyrolyze cypress stems at 600-700°C for 2-4 hours under an inert atmosphere to obtain silicon-carbon material;

[0062] The inert atmosphere includes at least one of nitrogen, helium, neon, and argon.

[0063] In some embodiments, the silicon-carbon material is ground into powder to a particle size of 50 to 200 μm to obtain carbon powder.

[0064] The cypress stalks are treated by high-temperature pyrolysis reaction in a gasification furnace to obtain silicon-carbon material. This material has a multi-level pore activated carbon material with micropores and macropores interconnected. The porous feature has strong adsorption capacity, and it also has the functions of noise reduction and odor absorption.

[0065] In some embodiments, carbon powder and polypropylene resin are mixed, ethanol is added as a solvent, and polyacrylate is added as a dispersant, and stirred to obtain a slurry;

[0066] In the step of mixing carbon powder and polypropylene resin, the mass ratio of carbon powder to polypropylene resin is 1:(1-3), the mass ratio of carbon powder to solvent ethanol is 1:(38-42), and the mass ratio of carbon powder to dispersant polyacrylate is (40-42):1.

[0067] In some embodiments, the fiber raw yarn is woven into a fiber cloth through a weaving process, wherein the density of the fiber cloth is 0.7-1.1 g / cm 3 ; The thickness of the fiber cloth is 6 to 10 mm.

[0068] In some embodiments, the weaving process of the fiber cloth is such that two directions are either parallel or cross-angled, that is, the fiber filaments are woven through warp and weft to obtain the fiber cloth.

[0069] Based on the same inventive concept, the present invention also provides a biomass-based fiber composite material, which is prepared using the above-mentioned preparation method.

[0070] Based on the same inventive concept, the present invention also provides a biomass-based fiber composite material prepared by the above-mentioned preparation method or the use of the above-mentioned biomass-based fiber composite material in the preparation of automobile interior decoration parts.

[0071] The specific automobile interior decoration part can be the lower baffle of the air-conditioning box in the automobile.

[0072] In some embodiments, a biomass-based fiber composite material is placed in a mold, and then a polypropylene resin is laid on the biomass-based fiber composite material, and then the biomass-based fiber composite material is laid on the polypropylene resin again, and the operation is repeated so that the biomass-based fiber composite material and the polypropylene resin are alternately arranged in sequence; then it is softened at a temperature of 200-220°C for 3-7 minutes, and finally maintained at a pressure of 12.5-15 MPa for 60-80 seconds to obtain an automotive interior part.

[0073] Specifically, the mass ratio of the biomass-based fiber composite material and the polypropylene resin is (4-6): (4-6), and the biomass-based fiber composite material and the polypropylene resin are alternately arranged in sequence until the final product meets the surface density requirement (600g / m 2 ~1800g / m 2 ), then softened at a temperature of 200-220°C for 3-7 minutes, and finally maintained at a pressure of 12.5-15 MPa for 60-80 seconds to obtain automotive interior parts.

[0074] In some embodiments, the automotive interior decoration parts prepared by the present invention can also have the effects of cypress invigorating the spleen and replenishing qi, dispelling wind and dampness, etc.

[0075] This invention utilizes biomass-based fiber composite materials to manufacture automotive interior components, such as the lower baffle of an automobile air conditioning box. Electron microscopy reveals that the cross-section of cypress fiber exhibits a multi-level pore structure with interconnected micropores and macropores. This porous nature of activated carbon materials provides strong adsorption, allowing them to quickly absorb and evaporate water. Using biomass-based fiber composite materials to manufacture the lower baffle of an air conditioning box helps keep the baffle dry while also absorbing noise inside the vehicle. The product also has a subtle herbal aroma.

[0076] The cedar fiber material obtained after treatment in the present invention can fully utilize the high strength, moisture absorption and dehumidification, heat insulation, sound insulation and other properties of cedar fiber, and is mixed and dried with the silicon-carbon material made of cedar stems to finally prepare a biomass-based fiber composite material. The biomass-based fiber composite material has wear resistance due to the carbon element it contains, and also has anti-static and odor-eliminating functions.

[0077] The following further illustrates the biomass-based fiber composite material of the present application, its preparation method, and application with specific examples. This section further illustrates the content of the present invention in conjunction with specific examples, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in the art.

[0078] Example 1

[0079] The present invention provides a method for preparing a biomass-based fiber composite material, comprising the following steps:

[0080] S1. Take cypress stalks, remove branches, leaves and surface impurities, clean the cypress stalk skin, and cut it into 3-5 cm lengths; soak the cypress stalk skin in a 20 g / L sodium hydroxide aqueous solution for 50 h;

[0081] S2. Adding a sodium silicate degumming agent to the soaked cypress stalk skin and steaming at 140° C. for 6 h to decompose the colloid in the fiber; sodium silicate is added in the form of a sodium silicate solution (aqueous solution) with a concentration of 3 g / L;

[0082] S3. Adding a solution containing sodium sulfite and compound sodium phosphate to the boiled flax stem skin, and standing at room temperature (25° C.) for 24 hours to obtain flax fiber; the preparation method of the solution containing sodium sulfite and compound sodium phosphate is as follows: adding sodium sulfite and compound sodium phosphate to water to obtain a solution containing sodium sulfite and compound sodium phosphate, wherein the concentration of sodium sulfite is 2 g / L and the concentration of compound sodium phosphate is 3 g / L;

[0083] S4. Adding ramie fiber to a bulking agent containing a metal oxide and subjecting the fiber to a bulking and fluffing treatment at 45° C. for 2 hours. The bulking agent is prepared by adding MgO to water to obtain the bulking agent, wherein the concentration of MgO is 12 g / L.

[0084] S5. Add a qualitative agent to the expanded ceramsite fiber and treat at 30° C. for 30 minutes. The qualitative agent is prepared by adding CuCl2 to ammonia water to obtain a copper ammonia (Cu(NH3)4](OH)2) solution, which is the qualitative agent; the copper ion concentration in the copper ammonia solution is 1 mol / L;

[0085] S6, drying the qualitative cypress fiber at room temperature;

[0086] S7, pyrolyzing the cypress stems at 650° C. for 3 h under a nitrogen atmosphere to obtain a silicon-carbon material;

[0087] S8, grinding the silicon-carbon material into powder so that the particle size is 100 μm to obtain carbon powder;

[0088] S9, mixing carbon powder and polypropylene resin in a mass ratio of 1:2, then adding ethanol as a solvent, and then adding polyacrylate as a dispersant, stirring to obtain a slurry; the mass ratio of carbon powder to solvent ethanol is 1:40, and the mass ratio of carbon powder to dispersant polyacrylate is 40:1;

[0089] S10, coating the slurry on the surface of dry cypress fiber, curing at room temperature, and weaving into fiber precursor;

[0090] S11, weaving the fiber raw yarn into fiber cloth through a weaving process.

[0091] This embodiment also provides an application of the biomass-based fiber composite material prepared in Example 1 in preparing automotive interior parts. Specifically, the method for preparing the automotive interior parts includes:

[0092] The biomass-based fiber composite material is placed in a mold, and then polypropylene resin is laid on the biomass-based fiber composite material, and then the biomass-based fiber composite material is laid on the polypropylene resin again, and the operation is repeated to make the biomass-based fiber composite material and the polypropylene resin alternately arranged in sequence; then softened at a temperature of 220 ° C for 5 minutes, and finally maintained at a pressure of 15 MPa for 80 seconds to obtain an automotive interior part; wherein, the mass ratio of the biomass-based fiber composite material to the polypropylene resin is 5:5, and the biomass-based fiber composite material and the polypropylene resin are alternately arranged in sequence until the final product meets the surface density requirement (1200g / m 2 ).

[0093] Performance Characterization

[0094] Figure 1 This is a SEM image of the slurry coated on the surface of dry cedar fiber in step S10 of Example 1 and cured at room temperature.

[0095] from Figure 1 As can be seen in the figure, carbon powder adsorbs onto the surface of cypress fibers, ultimately depositing large honeycomb-like solids (particle size >10μm) on the fiber surface. This composite material uses cypress fibers as a matrix, supplemented by silicon-carbon particles for reinforcement. This improves the fiber's mechanical properties, wear resistance, and antistatic properties (a high carbon content increases the fiber's stiffness and hardness, and carbon powder is a highly conductive powder material, which helps reduce surface impedance and improve antistatic capabilities). The carbon powder's microporous structure also has pore adsorption properties, which improves odor and sound absorption.

[0096] Figure 2 This is an SEM image of the carbon powder prepared in step S8 of Example 1.

[0097] from Figure 2It can be seen that the prepared carbon powder is a porous material with scaly protrusions and tiny pores on the surface. These structures can greatly increase the specific surface area of ​​the material, thereby improving its ability to adsorb sound and odor.

[0098] Figure 3 This is a physical picture of an automobile interior decoration part (specifically, a lower baffle of an air-conditioning box) prepared by the preparation method of Example 1.

[0099] Figure 4 This is the SEM image of the flax fiber in step S6 of Example 1.

[0100] Figure 5 This is a physical picture of the carbon powder prepared in step S8 of Example 1.

[0101] The Shore hardness of the automobile interior parts prepared in Example 1 is 65, while the Shore hardness of automobile interior parts prepared using conventional polypropylene resin is 40-50. The surface impedance of the automobile interior parts prepared in Example 1 is 1.2×10 10 Ω, while the surface impedance of traditional automotive interior parts made of polypropylene resin is >10 16 Ω; The above description shows that the automotive interior parts prepared by the present invention have better wear resistance and antistatic properties (the charge of the material with low surface resistance flows easily on the surface, and thus is not easily accumulated to generate static electricity).

[0102] The automotive interior parts prepared in Example 1 have a strong plant fiber fragrance (traditional Chinese medicine fragrance) and a TVOC value of 765 μg / m 3 The traditional car interior parts made of polypropylene resin have a strong plastic smell and a TVOC value of 16273μg / m 3 ,, indicating that the automotive interior parts prepared by the present invention can eliminate odors. TVOC refers to total organic volatiles, a quantitative indicator of automobile air pollution, mainly including small molecular volatiles such as benzene, alkanes, and aromatic hydrocarbons. The larger the TVOC value, the larger the odor molecules entering the human respiratory system and the worse the odor. For passenger car interior parts, TVOC is generally required to be less than 15000μg / m 3 The automobile interior decoration parts prepared by the present invention have a lower TVOC value, are more environmentally friendly and less harmful to the human body.

[0103] The automotive interior trim prepared in Example 1 has a flexural strength of up to 50.3 MPa and a flexural modulus of up to 3798 MPa, and has good mechanical properties.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a biomass-based fiber composite material, characterized in that: The following steps are involved: Soaking the cypress stem skin in a sodium hydroxide solution for 30 to 60 hours, wherein the mass concentration of the sodium hydroxide solution is 15 to 20 g / L; Adding a sodium silicate degumming agent to the soaked cypress stalk skin, steaming at 120-160° C. to decompose the colloid in the fiber; the steaming time is 4-8 hours, and the sodium silicate is added in the form of a sodium silicate solution with a concentration of 2-4 g / L; A solution containing sodium sulfite and compound sodium phosphate is added to the surface of steamed flax stalks, and the mixture is allowed to stand for 20 to 30 hours to obtain flax fiber. The preparation method of the solution containing sodium sulfite and compound sodium phosphate is as follows: sodium sulfite and compound sodium phosphate are added to water to obtain a solution containing sodium sulfite and compound sodium phosphate, wherein the concentration of sodium sulfite is 1 to 4 g / L and the concentration of compound sodium phosphate is 1 to 4 g / L. The ceramie fiber is added to a bulking agent containing a metal oxide and subjected to a bulking and fluffing treatment at 35 to 60° C. The bulking and fluffing treatment lasts for 2 to 3 hours. The bulking agent is prepared by adding MgO to water to obtain the bulking agent, wherein the concentration of MgO is 10 to 15 g / L. A qualitative agent is added to the expanded ceramsite fiber and treated at 25-30° C. for 25-30 minutes, wherein the qualitative agent is prepared by adding CuCl2 to ammonia water to obtain a copper ammonia solution, which is the qualitative agent; the copper ion concentration in the copper ammonia solution is 0.5-1.5 mol / L; Drying the cypress fiber after characterization; Pyrolyze cypress stems at 600-700°C for 2-4 hours under an inert atmosphere to obtain silicon-carbon material; Grinding the silicon-carbon material into powder to obtain carbon powder; The carbon powder and the polypropylene resin are mixed, and then ethanol is added as a solvent, and polyacrylate is added as a dispersant, and stirred to obtain a slurry; the mass ratio of the carbon powder to the polypropylene resin is 1:(1-3), the mass ratio of the carbon powder to the solvent ethanol is 1:(38-42), and the mass ratio of the carbon powder to the dispersant polyacrylate is (40-42):1; The slurry is coated on the surface of dry cypress fiber, solidified, and spun into fiber strands; The fiber raw yarn is woven into fiber cloth through a weaving process.

2. The method for preparing a biomass-based fiber composite material according to claim 1, wherein: The inert atmosphere includes at least one of nitrogen, helium, neon and argon.

3. A biomass-based fiber composite material, characterized in that: The preparation method is as described in any one of claims 1 to 2.

4. Use of a biomass-based fiber composite material prepared by the preparation method according to any one of claims 1 to 3 or the biomass-based fiber composite material according to claim 3 in the preparation of automotive interior parts.

5. The use according to claim 4, wherein the biomass-based fiber composite material is placed in a mold, and then a polypropylene resin is laid on the biomass-based fiber composite material, and then the biomass-based fiber composite material is laid on the polypropylene resin again, and the operation is repeated so that the biomass-based fiber composite material and the polypropylene resin are alternately arranged in sequence; then, the mold is softened at a temperature of 200-220° C. for 3-7 minutes, and finally, the mold is maintained at a pressure of 12.5-15 MPa for 60-80 seconds to obtain an automotive interior component.

Images