Heat-conducting antibacterial xanthium sibiricum multilayer fiber structure and preparation method thereof

Abstract

The invention relates to the technical field of layered products, in particular to a heat-conducting antibacterial xanthium sibiricum multilayer fiber structure and a preparation method thereof.The preparation method includes the steps that jute fibers, graphene fibers and low-melting-point fibers are evenly mixed, and after carding, lapping and needling treatment, a composite fiber layer is formed; hemp fibers and low-melting-point fibers are evenly mixed, and after carding, lapping and needling treatment, a pressure-bearing fiber layer is formed; the heat-insulation antibacterial fiber layer is stacked on the top of the pressure-bearing fiber layer, the composite fiber layer continues to be stacked on the top of the heat-insulation antibacterial fiber layer, and the heat-conduction antibacterial xanthium sibiricum multi-layer fiber structure is prepared through hot-pressing curing shaping and fine trimming. The multi-layer fiber structure is a layered product composed of the composite fiber layer, the heat-insulation antibacterial fiber layer and the pressure-bearing fiber layer, and has good air permeability, antibacterial property and excellent heat preservation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of laminated products, and specifically to a heat-conducting and antibacterial graphite hemp multi-layer fiber structure and a preparation method thereof. Background Art

[0002] Sleep is the guarantee for the restoration of human energy and physical strength, and has an important impact on human physiological and mental health, work and study efficiency, quality of life, social interaction, etc. As a sleep platform, the mattress also has an important impact on sleep quality. There are many types of mattress structures and materials, and the types of mattress structures used are gradually becoming more diversified, mainly including spring mattress structures, fiber mattress structures, latex mattress structures, sponge mattress structures, etc. Among them, the hemp fiber structure in the fiber mattress structure has good air permeability and can also better prevent moisture and mold growth, but its heat preservation performance is poor, resulting in limited application.

[0003] The graphene inner-warmth fiber applied to the clothing field is a functional fiber composed of different proportions of biomass graphene and different fibers, and it has a good heat storage and insulation effect. However, there is currently no research on directly compounding hemp fibers and graphene fibers to solve the insufficient heat preservation performance of the hemp fiber mattress structure. Based on this, a heat-conducting and antibacterial graphite hemp multi-layer fiber structure and a preparation method thereof are proposed. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a heat-conducting and antibacterial graphite hemp multi-layer fiber structure and a preparation method thereof. The obtained multi-layer fiber structure is a laminated product composed of a composite fiber layer, a heat-insulating and antibacterial fiber layer, and a pressure-bearing fiber layer, and it has good air permeability, antibacterial property, and excellent heat preservation performance.

[0005] To achieve the above object, the present invention provides the following technical solution: A heat-conducting and antibacterial graphite hemp multi-layer fiber structure, which includes a composite fiber layer, a heat-insulating and antibacterial fiber layer, and a pressure-bearing fiber layer arranged in sequence from top to bottom; the composite fiber layer is composed of hemp fiber, graphene fiber, and low-melting-point fiber; the heat-insulating and antibacterial fiber layer is composed of hemp fiber, aerogel, and antibacterial substance; the pressure-bearing fiber layer is composed of hemp fiber and low-melting-point fiber.

[0006] Preferably, the thickness of the composite fiber layer accounts for 50-60% of the total thickness of the heat-conducting and antibacterial graphite hemp multi-layer fiber structure, the thickness of the heat-insulating and antibacterial fiber layer accounts for 10-15% of the total thickness of the heat-conducting and antibacterial graphite hemp multi-layer fiber structure, and the thickness of the pressure-bearing fiber layer accounts for 25-40% of the total thickness of the heat-conducting and antibacterial graphite hemp multi-layer fiber structure.

[0007] Preferably, the low-melting-point fiber is high-elastic 4080 fiber.

[0008] Preferably, by mass percentage, in the composite fiber layer, hemp fiber accounts for 55 - 65%, graphene fiber accounts for 20 - 35%, and low-melting-point fiber accounts for 10 - 15%; in the pressure-bearing fiber layer, hemp fiber accounts for 80 - 90%, and low-melting-point fiber accounts for 10 - 20%.

[0009] Preferably, the preparation method of the heat-insulating and antibacterial fiber layer is as follows: S1. After the hemp fiber is carded, cross-laid, and needled, a hemp fiber layer is formed; S2. The hemp fiber layer is impregnated in a gel precursor solution, then taken out and placed in a mold, and the gel precursor solution is added into the mold to just cover the hemp fiber layer, and the gel is sealed and allowed to stand to obtain a gelled hemp fiber layer; S3. The gelled hemp fiber layer is aged, solvent-exchanged, surface-modified, and dried to obtain a heat-insulating fiber layer containing aerogel; S4. The heat-insulating fiber layer is impregnated in an antibacterial liquid and shaken, taken out and dried to obtain a heat-insulating and antibacterial fiber layer containing antibacterial substances.

[0010] Preferably, in step S2, the preparation method of the gel precursor solution is as follows: Tetraethyl orthosilicate and absolute ethanol are stirred, and 0.3 mol / L hydrochloric acid solution is poured in to adjust the pH to 3; then deionized water and N,N-dimethylformamide are added, and 0.3 mol / L ammonia water is used to adjust the pH to 8 to obtain the gel precursor solution; wherein, the molar ratio of tetraethyl orthosilicate, absolute ethanol, deionized water, and N,N-dimethylformamide is 1:6:2:0.3.

[0011] Preferably, in step S3, the gelled hemp fiber layer is first aged at room temperature for 8 - 10 h, and aged with 20 wt% ethanol solution for 10 - 14 h; then solvent-exchanged with n-hexane for 12 h; then immersed in a mixed solution of n-hexane and trimethylchlorosilane for 16 h for surface modification, and finally washed and dried with n-hexane; wherein, the volume ratio of trimethylchlorosilane to n-hexane is 1:10.

[0012] Preferably, in step S4, the preparation method of the antibacterial liquid is as follows: Nano zinc oxide, sodium dodecyl sulfate, and deionized water are stirred evenly to obtain the antibacterial liquid.

[0013] Preferably, the mass ratio of nano zinc oxide, sodium dodecyl sulfate, and deionized water is 5:1:30.

[0014] The present invention also provides a preparation method of a heat-conducting and antibacterial graphite hemp multi-layer fiber structure, including the following steps: (1) Hemp fiber, graphene fiber, and low-melting-point fiber are uniformly mixed, and after being carded, cross-laid, and needled, a composite fiber layer is formed; (2) Hemp fiber and low-melting-point fiber are uniformly mixed, and after being carded, cross-laid, and needled, a pressure-bearing fiber layer is formed; (3) Stack an insulating and antibacterial fiber layer on top of the pressure-bearing fiber layer, and then stack a composite fiber layer on top of the insulating and antibacterial fiber layer. After hot pressing, curing and sizing, and precision trimming, a thermally conductive and antibacterial graphite hemp multi-layer fiber structure is obtained.

[0015] The present invention provides a thermally conductive and antibacterial graphite hemp multi-layer fiber structure and a preparation method thereof. Compared with the prior art, the following beneficial effects are achieved: The multi-layer fiber structure in the present invention is a layered product composed of a composite fiber layer, an insulating and antibacterial fiber layer, and a pressure-bearing fiber layer. It has good air permeability, antibacterial property, and excellent heat preservation performance. Specifically, using graphene fiber and hemp fiber composite as the top layer, the graphene-hemp composite fiber can absorb external heat energy, including the heat energy dissipated by the human body, store it, and then feedback it to the human body, thereby improving the human body's temperature perception and enhancing the heat storage and heat preservation effect; using the insulating and antibacterial fiber layer as the middle layer can effectively prevent the heat of the top layer from flowing downward, thereby further improving the heat preservation effect; using the pressure-bearing fiber layer as the bottom layer, combined with the composite fiber layer, can protect the insulating and antibacterial fiber layer.

[0016] The present invention impregnates the heat-insulating fiber layer in an antibacterial liquid and shakes it, and then obtains the heat-insulating and antibacterial fiber layer through drying treatment. It can effectively load nano-zinc oxide into the pores of the aerogel, making it have good antibacterial properties, and at the same time, it will not have a great impact on the air permeability of the multi-layer fiber structure. Description of the Drawings

[0017] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings: Figure 1 is a schematic diagram of the thermally conductive and antibacterial graphite hemp multi-layer fiber structure of the present invention; Figure 2 is an end view of the thermally conductive and antibacterial graphite hemp multi-layer fiber structure product of the present invention. Specific Embodiments

[0018] The following embodiments are used to detail the implementation manners of the present application, so as to fully understand how the present application uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0019] Example 1 The preparation method of the heat-insulating and antibacterial fiber layer is as follows: S1. After the hemp fiber is carded, cross-laid, and needled, a hemp fiber layer is formed.

[0020] S2. Immerse the hemp fiber layer in the gel precursor solution, then take it out and put it into a mold. Add the gel precursor solution into the mold to just cover the hemp fiber layer, seal and let the gel stand still to obtain a gelated hemp fiber layer; The preparation method of the above gel precursor solution is as follows: Stir tetraethyl orthosilicate and absolute ethanol, pour into 0.3 mol / L hydrochloric acid solution to adjust the pH to 3; then add deionized water and N,N-dimethylformamide, and adjust the pH to 8 with 0.3 mol / L ammonia water to prepare the gel precursor solution; among them, the molar ratio of tetraethyl orthosilicate, absolute ethanol, deionized water and N,N-dimethylformamide is 1:6:2:0.3.

[0021] S3. The gelated hemp fiber layer is first aged at room temperature for 8 h, and aged in 20 wt% ethanol solution for 14 h; then solvent replacement is carried out with n-hexane for 12 h; then immersed in a mixture of n-hexane and trimethylchlorosilane (10:1 v / v) for 16 h for surface modification, and finally washed and dried with n-hexane to obtain a heat-insulating fiber layer containing aerogel.

[0022] S4. Immerse the heat-insulating fiber layer in the antibacterial liquid and shake it, take it out and dry it to obtain a heat-insulating and antibacterial fiber layer containing antibacterial substances. Among them, the preparation method of the antibacterial liquid is as follows: Stir nano-zinc oxide, sodium dodecyl sulfate and deionized water evenly according to the mass ratio of 5:1:30 to prepare the antibacterial liquid.

[0023] Example 2 The preparation method of the heat-insulating and antibacterial fiber layer is as follows: S1. After the hemp fiber is carded, cross-laid and needled, a hemp fiber layer is formed.

[0024] S2. Immerse the hemp fiber layer in the gel precursor solution, then take it out and put it into a mold. Add the gel precursor solution into the mold to just cover the hemp fiber layer, seal and let the gel stand still to obtain a gelated hemp fiber layer; The preparation method of the above gel precursor solution is as follows: Stir tetraethyl orthosilicate and absolute ethanol, pour into 0.3 mol / L hydrochloric acid solution to adjust the pH to 3; then add deionized water and N,N-dimethylformamide, and adjust the pH to 8 with 0.3 mol / L ammonia water to prepare the gel precursor solution; among them, the molar ratio of tetraethyl orthosilicate, absolute ethanol, deionized water and N,N-dimethylformamide is 1:6:2:0.3.

[0025] S3. The gelled ramie fiber layer is first aged at room temperature for 10 h, then aged in a 20 wt% ethanol solution for 10 h; subsequently, solvent replacement is carried out with n - hexane for 12 h; then it is immersed in a mixed solution of n - hexane and trimethylchlorosilane (10:1 v / v) for 16 h for surface modification, and finally, it is washed with n - hexane and dried to obtain a heat - insulating fiber layer containing aerogel.

[0026] S4. The heat - insulating fiber layer is impregnated in the antibacterial liquid and shaken, and then taken out and dried to obtain a heat - insulating and antibacterial fiber layer containing antibacterial substances. Among them, the preparation method of the antibacterial liquid is as follows: nano - zinc oxide, sodium dodecyl sulfate and deionized water are stirred evenly according to a mass ratio of 5:1:30 to prepare the antibacterial liquid.

[0027] Example 3 A preparation method of a heat - conducting and antibacterial graphite - ramie multi - layer fiber structure includes the following steps: (1) Ramie fibers, graphene fibers and high - elastic 4080 low - melting - point fibers are evenly mixed, and after carding, web - laying and needling treatments, a composite fiber layer is formed; by mass percentage, in the composite fiber layer, ramie fibers account for 55%, graphene fibers account for 35%, and high - elastic 4080 low - melting - point fibers account for 10%.

[0028] (2) Ramie fibers and high - elastic 4080 low - melting - point fibers are evenly mixed, and after carding, web - laying and needling treatments, a pressure - bearing fiber layer is formed; by mass percentage, in the pressure - bearing fiber layer, ramie fibers account for 90%, and high - elastic 4080 low - melting - point fibers account for 10%.

[0029] (3) The heat - insulating and antibacterial fiber layer is stacked on top of the pressure - bearing fiber layer, and the composite fiber layer is continuously stacked on top of the heat - insulating and antibacterial fiber layer, and after hot - pressing, curing and sizing and fine trimming, a heat - conducting and antibacterial graphite - ramie multi - layer fiber structure is obtained.

[0030] In this example, the heat - insulating and antibacterial fiber layer prepared in Example 1 is used.

[0031] In this example, the heat - conducting and antibacterial graphite - ramie multi - layer fiber structure prepared according to the above - mentioned preparation method includes, from top to bottom, a composite fiber layer, a heat - insulating and antibacterial fiber layer and a pressure - bearing fiber layer arranged in sequence; among them, the thickness of the composite fiber layer accounts for 50% of the total thickness of the heat - conducting and antibacterial graphite - ramie multi - layer fiber structure, the thickness of the heat - insulating and antibacterial fiber layer accounts for 10% of the total thickness of the heat - conducting and antibacterial graphite - ramie multi - layer fiber structure, and the thickness of the pressure - bearing fiber layer accounts for 40% of the total thickness of the heat - conducting and antibacterial graphite - ramie multi - layer fiber structure.

[0032] Example 4 A preparation method of a heat - conducting and antibacterial graphite - ramie multi - layer fiber structure includes the following steps: (1) Uniformly mix ramie fiber, graphene fiber and high-elastic 4080 low-melting-point fiber, and after carding, web laying and needling treatments, form a composite fiber layer; by mass percentage, in the composite fiber layer, ramie fiber accounts for 65%, graphene fiber accounts for 20%, and high-elastic 4080 low-melting-point fiber accounts for 15%.

[0033] (2) Uniformly mix ramie fiber and high-elastic 4080 low-melting-point fiber, and after carding, web laying and needling treatments, form a pressure-bearing fiber layer; by mass percentage, in the pressure-bearing fiber layer, ramie fiber accounts for 80%, and high-elastic 4080 low-melting-point fiber accounts for 20%.

[0034] (3) Stack an insulation and antibacterial fiber layer on top of the pressure-bearing fiber layer, and continue to stack the composite fiber layer on top of the insulation and antibacterial fiber layer. After hot pressing, curing and sizing and fine trimming, obtain a thermally conductive and antibacterial graphite ramie multi-layer fiber structure.

[0035] In this embodiment, the insulation and antibacterial fiber layer prepared in Example 1 is used.

[0036] In the thermally conductive and antibacterial graphite ramie multi-layer fiber structure prepared by the above preparation method in this embodiment, from top to bottom, it includes a composite fiber layer, an insulation and antibacterial fiber layer, and a pressure-bearing fiber layer arranged in sequence; among them, the thickness of the composite fiber layer accounts for 60% of the total thickness of the thermally conductive and antibacterial graphite ramie multi-layer fiber structure, the thickness of the insulation and antibacterial fiber layer accounts for 15% of the total thickness of the thermally conductive and antibacterial graphite ramie multi-layer fiber structure, and the thickness of the pressure-bearing fiber layer accounts for 25% of the total thickness of the thermally conductive and antibacterial graphite ramie multi-layer fiber structure.

[0037] Example 5 A preparation method of a thermally conductive and antibacterial graphite ramie multi-layer fiber structure, comprising the following steps: (1) Uniformly mix ramie fiber, graphene fiber and high-elastic 4080 low-melting-point fiber, and after carding, web laying and needling treatments, form a composite fiber layer; by mass percentage, in the composite fiber layer, ramie fiber accounts for 60%, graphene fiber accounts for 30%, and high-elastic 4080 low-melting-point fiber accounts for 10%.

[0038] (2) Uniformly mix ramie fiber and high-elastic 4080 low-melting-point fiber, and after carding, web laying and needling treatments, form a pressure-bearing fiber layer; by mass percentage, in the pressure-bearing fiber layer, ramie fiber accounts for 85%, and high-elastic 4080 low-melting-point fiber accounts for 15%.

[0039] (3) Stack an insulation and antibacterial fiber layer on top of the pressure-bearing fiber layer, and continue to stack the composite fiber layer on top of the insulation and antibacterial fiber layer. After hot pressing, curing and sizing and fine trimming, obtain a thermally conductive and antibacterial graphite ramie multi-layer fiber structure.

[0040] In this embodiment, the insulation and antibacterial fiber layer prepared in Example 2 is used.

[0041] In this embodiment, the thermally conductive antibacterial graphite ramie multi-layer fiber structure prepared by the above preparation method includes, from top to bottom, a composite fiber layer, a heat-insulating antibacterial fiber layer, and a pressure-bearing fiber layer arranged in sequence; wherein, the thickness of the composite fiber layer accounts for 55% of the total thickness of the thermally conductive antibacterial graphite ramie multi-layer fiber structure, the thickness of the heat-insulating antibacterial fiber layer accounts for 15% of the total thickness of the thermally conductive antibacterial graphite ramie multi-layer fiber structure, and the thickness of the pressure-bearing fiber layer accounts for 30% of the total thickness of the thermally conductive antibacterial graphite ramie multi-layer fiber structure.

[0042] Comparative Example 1 A preparation method of a thermally conductive antibacterial ramie multi-layer fiber structure is basically the same as that of Example 5, except that: the composite fiber layer is replaced by a compressive fiber layer. Among them, by mass percentage, in the compressive fiber layer, ramie fiber accounts for 90%, and high-elastic 4080 low-melting-point fiber accounts for 10%. The obtained thermally conductive antibacterial ramie multi-layer fiber structure includes, from top to bottom, a compressive fiber layer, a heat-insulating antibacterial fiber layer, and a pressure-bearing fiber layer arranged in sequence; wherein, the thickness of the compressive fiber layer accounts for 55% of the total thickness of the thermally conductive antibacterial ramie multi-layer fiber structure, the thickness of the heat-insulating antibacterial fiber layer accounts for 15% of the total thickness of the thermally conductive antibacterial ramie multi-layer fiber structure, and the thickness of the pressure-bearing fiber layer accounts for 30% of the total thickness of the thermally conductive antibacterial ramie multi-layer fiber structure.

[0043] Comparative Example 2 A preparation method of a thermally conductive antibacterial graphite ramie multi-layer fiber structure is basically the same as that of Example 5, except that: the heat-insulating antibacterial fiber layer is replaced by a pressure-bearing fiber layer. Among them, by mass percentage, in the pressure-bearing fiber layer, ramie fiber accounts for 85%, and high-elastic 4080 low-melting-point fiber accounts for 15%. The obtained thermally conductive antibacterial graphite ramie multi-layer fiber structure includes, from top to bottom, a composite fiber layer and a pressure-bearing fiber layer arranged in sequence; wherein, the thickness of the composite fiber layer accounts for 55% of the total thickness of the thermally conductive antibacterial graphite ramie multi-layer fiber structure, and the thickness of the pressure-bearing fiber layer accounts for 45% of the total thickness of the thermally conductive antibacterial graphite ramie multi-layer fiber structure.

[0044] Comparative Example 3 A preparation method of a thermally conductive antibacterial graphite ramie multi-layer fiber structure is basically the same as that of Example 5, except that: the heat-insulating antibacterial fiber layer is replaced by an antibacterial fiber layer.

[0045] The preparation method of the above antibacterial fiber layer is as follows: S1. After the ramie fiber is carded, cross-laid, and needled, a ramie fiber layer is formed.

[0046] S2. Immerse the hemp fiber layer in the antibacterial liquid and shake it. After taking it out, perform a drying treatment to obtain an antibacterial fiber layer containing antibacterial substances. Among them, the preparation method of the antibacterial liquid is as follows: Stir nano-zinc oxide, sodium dodecyl sulfate, and deionized water evenly according to a mass ratio of 5:1:30 to prepare the antibacterial liquid.

[0047] Comparative Example 4 A preparation method of a thermally conductive antibacterial graphite hemp multi-layer fiber structure is basically the same as that of Example 5, except that: the heat-insulating antibacterial fiber layer is replaced with a heat-insulating fiber layer containing aerogel, and the heat-insulating fiber layer containing aerogel used is the heat-insulating fiber layer containing aerogel prepared in Example 2.

[0048] Quality inspection 1. Take the multi-layer fiber structures in Examples 3-5 and Comparative Examples 1-4 as the detection objects. Refer to the standard of GB / T 24218.15-2018 for air permeability measurement; refer to the standard of GB / T 11048-2018 for thermal resistance measurement. The specific detection results are shown in the following table.

[0049] Table 1 Air permeability and thermal resistance

[0050] As can be seen from the above table: (1) Compared with Example 5, in Comparative Example 1, the composite fiber layer was replaced with a compressive fiber layer, and the air permeability of the obtained multi-layer fiber structure was still good, but the heat preservation performance decreased; (2) Compared with Example 5, in Comparative Examples 2 and 3, the heat-insulating antibacterial fiber layer was replaced with a pressure-bearing fiber layer and an antibacterial fiber layer respectively, resulting in a decrease in the air permeability and heat preservation performance of the obtained multi-layer fiber structure; (3) Compared with Example 5, in Comparative Example 4, the heat-insulating fiber layer containing aerogel was not subjected to antibacterial modification, and the obtained multi-layer fiber structure had excellent air permeability and heat preservation performance.

[0051] 2. Take the multi-layer fiber structures prepared in Example 5 and Comparative Examples 1-4 as the detection objects. Refer to the standard of GB / T 20944.3-2008 for antibacterial property measurement. The specific detection results are shown in the following table.

[0052] Table 2 Antibacterial property

[0053] As can be seen from the above table: (1) Compared with Example 5, in Comparative Example 1, graphene fibers were not added, which had a certain impact on the antibacterial effect of the multi-layer fiber structure; (2)Compared with Example 5, the heat-insulating antibacterial fiber layer is missing in Comparative Example 2, and the heat-insulating fiber layer containing aerogel is not antibacterial modified in Comparative Example 4, resulting in a significant reduction in the antibacterial performance of the obtained multi-layer fiber structure.

[0054] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermally conductive and antibacterial graphite ramie multilayer fiber structure, characterized in that: From top to bottom, it includes a composite fiber layer, a heat-insulating antibacterial fiber layer and a pressure-bearing fiber layer arranged in sequence; The composite fiber layer is composed of hemp fiber, graphene fiber and low melting point fiber; The heat-insulating antibacterial fiber layer is composed of hemp fiber, aerogel and antibacterial substances; The pressure-bearing fiber layer consists of hemp fiber and low-melting-point fiber.

2. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 1, characterized in that: The thickness of the composite fiber layer accounts for 50-60% of the total thickness of the thermal conductive antibacterial graphite tussock multilayer fiber structure, the thickness of the heat insulating antibacterial fiber layer accounts for 10-15% of the total thickness of the thermal conductive antibacterial graphite tussock multilayer fiber structure, and the thickness of the pressure bearing fiber layer accounts for 25-40% of the total thickness of the thermal conductive antibacterial graphite tussock multilayer fiber structure.

3. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 1, characterized in that: The low melting point fiber is high elastic 4080 fiber.

4. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 1, characterized in that: In terms of mass percentage, in the composite fiber layer, hemp fiber accounts for 55-65%, graphene fiber accounts for 20-35%, and low melting point fiber accounts for 10-15%; In the pressure-bearing fiber layer, hemp fiber accounts for 80-90% and low-melting-point fiber accounts for 10-20%.

5. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 1, characterized in that: The preparation method of the heat-insulating antibacterial fiber layer is as follows: S1, after the hemp fibers are combed, laid on a net and needled, a hemp fiber layer is formed; S2, immersing the hemp fiber layer in the gel precursor solution, then taking it out and putting it into a mold, adding the gel precursor solution into the mold so that it just covers the hemp fiber layer, sealing and letting the gel stand, and obtaining a gelled hemp fiber layer; S3, the gelled hemp fiber layer is subjected to aging, solvent replacement, surface modification and drying treatment to obtain a thermal insulation fiber layer containing aerogel; S4, immersing the heat insulating fiber layer in the antibacterial liquid and shaking it, taking it out and drying it, so as to obtain the heat insulating antibacterial fiber layer containing antibacterial substances.

6. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 5, characterized in that: In step S2, the preparation method of the gel precursor solution is as follows: tetraethyl orthosilicate and anhydrous ethanol are stirred, and a 0.3 mol / L hydrochloric acid solution is added to adjust the pH to 3; then deionized water and N,N-dimethylformamide are added, and the pH is adjusted to 8 with 0.3 mol / L ammonia water to obtain a gel precursor solution; Wherein, the molar ratio of tetraethyl orthosilicate, anhydrous ethanol, deionized water and N,N-dimethylformamide is 1:6:2:0.

3.

7. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 5, characterized in that: In step S3, the gelled hemp fiber layer is first aged at room temperature for 8-10 hours, then aged for 10-14 hours in a 20wt% ethanol solution, then solvent replaced with n-hexane for 12 hours, then immersed in a mixture of n-hexane and trimethylchlorosilane for 16 hours for surface modification, and finally washed with n-hexane and dried; Wherein, the volume ratio of trimethylchlorosilane to n-hexane is 1:

10.

8. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 5, characterized in that: In step S4, the preparation method of the antibacterial liquid is as follows: nano zinc oxide, sodium dodecyl sulfate and deionized water are stirred evenly to prepare the antibacterial liquid.

9. The heat-conductive and antibacterial graphite ramie multilayer fiber structure according to claim 8, characterized in that: The mass ratio of the nano zinc oxide, sodium dodecyl sulfate and deionized water is 5:1:

30.

10. The method for preparing the thermally conductive antibacterial graphite tussock multilayer fiber structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) The hemp fiber, graphene fiber and low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, a composite fiber layer is formed; (2) The hemp fiber and the low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, a pressure-bearing fiber layer is formed; (3) A heat-insulating and antibacterial fiber layer is stacked on top of the pressure-bearing fiber layer, and a composite fiber layer is stacked on top of the heat-insulating and antibacterial fiber layer. After hot pressing, curing, shaping, and fine trimming, a heat-conductive and antibacterial graphite ramie multilayer fiber structure is obtained.

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