Graphene functional fabric and preparation method thereof

Abstract

The invention discloses a graphene functional fabric and a preparation method thereof. The preparation method comprises the following steps: synthesis of graphene oxide, preparation of anisotropic graphene aerogel, treatment of silk fibers, preparation of a graphene silk protein scaffold and molding of the graphene functional fabric. In the preparation process of the anisotropic graphene aerogel, raw materials of the graphene aerogel mainly comprise polyacrylonitrile and graphene oxide, and dispersion liquid of the polyacrylonitrile and the graphene oxide is subjected to one-way freezing, freeze drying, high-temperature carbonization and graphitization to obtain the anisotropic graphene aerogel. According to the preparation method, the bonding process of the graphene oxide and the surface of the silk fiber is improved, so that the ultraviolet-proof performance and the antibacterial performance of the silk fiber are improved, and the air permeability of the fabric can also be improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of multifunctional fabrics, and particularly relates to a graphene functional fabric and a preparation method thereof. BACKGROUND

[0002] The silk industry has been one of the important industries of the national economy in China for a long time. Among them, silk is a natural protein fiber, which has excellent mechanical properties, heat resistance, insulation, moisture absorption and special luster, and is thus applied to the textile field. Meanwhile, due to its excellent natural properties such as good biocompatibility, controllable degradability and good environmental stability, the silk is widely applied to the fields of biology, food, cosmetics and the like.

[0003] Since the silk fiber is a protein fiber, the molecular structure of the silk fiber contains aromatic amino acids, so that the silk fiber has a certain absorption to ultraviolet rays below 300 nm. In order to further improve the ultraviolet resistance of the silk fiber, in the prior art, graphene oxide is arranged on the surface of the silk fiber. The graphene oxide is uniformly distributed on the surface of the silk fiber, ethanol promotes the adhesion of the sheet-shaped graphene oxide on the surface of the silk fiber, and after the graphene oxide arrangement, the ultraviolet resistance and antibacterial properties of the silk fiber are significantly improved.

[0004] However, the air permeability of the silk fiber is decreased to a certain extent after the graphene oxide arrangement. In order to reduce the influence of the graphene oxide on the air permeability of the fabric, the application provides a scheme. SUMMARY

[0005] The application provides a graphene functional fabric and a preparation method thereof. The combination process of the graphene oxide and the surface of the silk fiber is improved, the ultraviolet resistance and antibacterial properties of the silk fiber are improved, and the air permeability of the fabric is also increased.

[0006] The application provides a preparation method of a graphene functional fabric, which comprises the following steps: synthesis of graphene oxide, preparation of anisotropic graphene aerogel, treatment of silk fibers, preparation of a graphene silk protein scaffold, and forming of the graphene functional fabric. In the preparation process of the anisotropic graphene aerogel, the raw material of the graphene aerogel mainly comprises polyacrylonitrile and graphene oxide. The dispersion liquid of the polyacrylonitrile and the graphene oxide is subjected to one-way freezing, freeze-drying, high-temperature carbonization and graphitization to obtain the anisotropic graphene aerogel.

[0007] By adopting the technical scheme, the graphene material is improved, and the improved process is different from the graphene aerogel for the fabric on the market. The graphene aerogel with high porosity is adopted to reduce the filling content of graphene in the composite material to the maximum, so as to retain various characteristics of the composite material. At the same time, the anisotropic graphene aerogel obtained through unidirectional freezing, freeze drying, high-temperature carbonization and graphitization can not only make the silk fiber have the properties of ultraviolet resistance and antibiosis, but also increase the air permeability of the fabric, and has sufficient shape stability, so that the air permeability can be kept for a long time.

[0008] Preferably, in the step of synthesizing the graphene oxide: a certain amount of graphite, sodium nitrate and concentrated sulfuric acid are mixed and stirred for a certain time, then a certain proportion of potassium permanganate is added to maintain the system reaction and stirring for a certain time, then hydrogen peroxide is added to remove the residual potassium permanganate, and then dilute hydrochloric acid and deionized water are used for acid washing and water washing to obtain an oxidized graphite slurry. After the oxidized graphite is ultrasonically peeled off by an ultrasonic cell crusher, a graphene oxide roughcast is obtained.

[0009] Preferably, in the preparation process of the anisotropic graphene aerogel, the graphene aerogel support is pretreated, the polyacrylonitrile is pre-oxidized in a reaction kettle at a certain temperature, and the graphene oxide roughcast is dissolved in deionized water and mixed in the reaction kettle for a certain time. After homogenization treatment for a certain time by a high-speed disperser, a uniformly mixed polyacrylonitrile and graphene oxide suspension is obtained.

[0010] By adopting the above technical scheme, since the graphene oxide dispersion liquid in the prior art has high viscosity due to its high concentration, it is not easy to form an anisotropic three-dimensional porous network by the ice mold method in the process of preparing the graphene aerogel. The three-dimensional skeleton of graphene is synthesized by the carbon polymer polyacrylonitrile, which is helpful for the fixation of the graphene aerogel with the silk fiber in the subsequent process.

[0011] Preferably, the weight ratio of the polyacrylonitrile to the graphene oxide is (1-5):(1-5).

[0012] Preferably, the polyacrylonitrile and graphene oxide suspension is transferred to a unidirectional freezing mold, and the unidirectional freezing is carried out by liquid nitrogen. After the polyacrylonitrile and graphene oxide suspension is completely frozen, freeze drying is carried out at a certain temperature and gas pressure. The composite aerogel after freeze drying is placed in a tube furnace filled with argon, and high-temperature carbonization is carried out at 800-1200℃ for a certain time. Then, the temperature is continued to rise to 2600-3000℃ in the graphitization furnace for a certain time for graphitization, and the anisotropic graphene aerogel is obtained.

[0013] By adopting the technical scheme, in the application, firstly, a long-range ordered vertical orientation structure is constructed by adopting the unidirectional freezing technology, and graphene oxide is thermally reduced to reduced graphene oxide by carbonizing polyacrylonitrile, so that part of the oxygen-containing functional groups on the surface of the graphene oxide are removed and the polyacrylonitrile is carbonized at the same time; and in the graphitization process, the oxygen-containing functional groups are further removed, and the lattice defects of the reduced graphene oxide are repaired, which is helpful for the subsequent formation of the graphene silk fibroin scaffold, and the high-porosity graphene aerogel increases the air permeability of the fabric.

[0014] Preferably, in the treatment step of the silk fiber, a certain mass of silk is pre-soaked in deionized water until completely wet, and the excess water on the surface is squeezed out, and then transferred to a steam pressure sterilization pot for steam treatment at a certain temperature and pressure, followed by ultrasonic cleaning, drying, then adding a certain amount of lithium bromide solution, dissolving at a certain temperature, placing the dissolved silk fibroin solution in a dialysis bag for dialysis for three days, and then centrifuging the silk fibroin solution with a high-speed centrifuge, and storing the obtained silk fibroin solution at low temperature.

[0015] Preferably, in the preparation of the graphene silk fibroin scaffold, a certain amount of the anisotropic graphene aerogel is added to the silk fibroin solution according to a certain mass fraction, and a certain concentration of ethanol is added, and the mixture is placed in an ultrasonic oscillator for a certain time, and the mixed solution is pre-frozen at low temperature, and then placed in a freeze dryer for freeze-drying treatment to obtain the graphene silk fibroin scaffold.

[0016] Preferably, in the forming step of the graphene functional fabric, the graphene silk fibroin scaffold is dissolved in deionized water, the mixed solution is stirred at a certain temperature for a certain time, and the pH is adjusted within a certain range to obtain an impregnating solution; and the finished cotton fabric is immersed in the impregnating solution, heated, impregnated, and baked, and then the fabric is washed with water and dried to constant weight to obtain the graphene functional fabric.

[0017] On the other hand, the application provides a graphene functional fabric prepared by the above preparation method.

[0018] The one or more technical solutions provided in the application have at least the following technical effects or advantages:

[0019] 1. The application improves the graphene material, and the high-porosity graphene aerogel is used to reduce the filling content of graphene in the composite material to the maximum extent, so as to retain the various characteristics of the composite material; the anisotropic graphene aerogel obtained by unidirectional freezing, freeze-drying, high-temperature carbonization and graphitization not only enables the silk fiber to have ultraviolet resistance and antibacterial properties, but also increases the air permeability of the fabric.

[0020] 2、The application is used to reduce the influence of high concentration of graphene oxide dispersion liquid on high viscosity, by synthesizing graphene three-dimensional skeleton from carbon polymer polyacrylonitrile, which helps to fix graphene aerogel with silk fiber in subsequent process.

[0021] 3、In the application, long-range ordered vertical orientation structure is constructed by using one-way freezing technology, and graphene oxide is thermally reduced to reduced graphene oxide by carbonization and graphitization of polyacrylonitrile, which removes oxygen-containing functional groups on the surface of graphene oxide, repairs lattice defects of reduced graphene oxide, and helps to form graphene silk fibroin scaffold in subsequent process. DETAILED DESCRIPTION

[0022] The application provides a graphene functional fabric and a preparation method thereof, which improves the combination process of graphene oxide and the surface of silk fiber, improves the ultraviolet resistance and antibacterial properties of silk fiber, and increases the air permeability of the fabric.

[0023] The technical solutions in the embodiments of the application will be clearly and completely described in combination with the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0024] It should be noted that the terms "first", "second" and the like in the specification and claims of the application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or server including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Raw materials

[0026] Silk fiber: The application uses commercially available A-grade short fiber silk.

[0027] Polyacrylonitrile: CAS number 5014-41-9, molecular weight 83.132, purity 95%.

[0028] Graphite: CAS number 7782-42-5, molecular weight 16.043, purity 99%.

[0029] Sodium nitrate: CAS number 7631-99-4 molecular weight 84.995 purity 99%.

[0030] Concentrated sulfuric acid: CAS number 7664-93-9 molecular weight 98.079 purity 99%.

[0031] Potassium permanganate: CAS number 7722-64-7 molecular weight 158.034 purity 95%.

[0032] Example

[0033] Example 1

[0034] S1, Synthesis of graphene oxide

[0035] 1.0 kg of graphite, 1.0 kg of sodium nitrate, and 3.0 L of concentrated sulfuric acid were mixed in proportion, stirred at 0°C for 1 h, then 1.5 kg of potassium permanganate was added to maintain the system reaction stirring for 3 h, and 2.0 L of deionized water was slowly added, and the temperature was controlled to always keep below 70°C, an appropriate amount of hydrogen peroxide was added to remove the residual potassium permanganate, then an appropriate amount of 15 wt% dilute hydrochloric acid was used for acid washing twice, then an appropriate amount of deionized water was used for water washing, then a high-speed centrifuge was used for gradient separation, and finally the graphene oxide slurry was obtained. After ultrasonic peeling of the graphene oxide by an ultrasonic cell crusher, the graphene oxide crude embryo was obtained.

[0036] S2, Preparation of anisotropic graphene aerogel

[0037] 0.5 kg of polyacrylonitrile was pre-oxidized in a reaction kettle at 250°C, and 0.1 kg of graphene oxide crude embryo was dissolved in 1.0 kg of deionized water and mixed in the reaction kettle for 3 h, and a high-speed disperser was used for homogenization treatment for 2 h to obtain a uniformly mixed polyacrylonitrile and graphene oxide suspension, which was transferred to a unidirectional freezing mold, and the polyacrylonitrile and graphene oxide suspension was completely frozen by liquid nitrogen into the unidirectional freezing mold, and then freeze-dried at -60°C and 2 Pa for 2 h; and the freeze-dried composite aerogel was placed in a tube furnace filled with argon, and carbonized at 1000°C for 3 h; then the temperature was further increased to 2800°C in a graphitization furnace for 3 h for graphitization, and anisotropic graphene aerogel was obtained.

[0038] S3, Treatment of silk fibers

[0039] 2.0 kg of silk was immersed in deionized water until completely wet, and the excess water on the surface was squeezed out, transferred to a steam pressure sterilization pot, and subjected to steam treatment at 125°C and 0.12 Mpa, followed by ultrasonic cleaning, drying, then adding a 9.0 mol / L lithium bromide solution, dissolving at 60°C, placing the dissolved silk solution in a dialysis bag and dialyzing for three days, and then centrifuging the silk solution with a high-speed centrifuge, and storing the obtained silk solution at 4°C.

[0040] S4, Preparation of graphene silk protein scaffold

[0041] 1.3 kg of anisotropic graphene aerogel with a mass fraction of 5% was added to the above silk solution, 50% ethanol was added, ultrasonic oscillation was performed for 1 h, the mixed solution was pre-frozen at -20°C for 3 h, and then placed in a freeze dryer for freeze-drying treatment for 48 h to obtain a graphene silk protein scaffold.

[0042] S5, Formation of graphene functional fabric

[0043] The above 1.2 kg of graphene silk protein scaffold was dissolved in 2.5 L of deionized water, the mixed solution was stirred at 25°C for 3 h, and the pH was adjusted to 6-9 to obtain an impregnation solution; and the finished cotton fabric was immersed in the impregnation solution, heated, impregnated, and baked, and then the fabric was washed with water and dried to constant weight to obtain a graphene functional fabric.

[0044] Example

[0045] Examples 2-5

[0046] Examples 2-5 differ from Example 1 in that the weight ratio between polyacrylonitrile and graphene oxide is different in the preparation of anisotropic graphene aerogel, and different proportions are finished as shown in the table below.

[0047] Examples 6-8

[0048] Examples 6-8 differ from Example 1 in that the temperature and pressure of freeze-drying are different in the preparation of anisotropic graphene aerogel.

[0049] Examples 9-11 differ from Example 1 in that the temperature and time of high-temperature carbonization are different in the preparation of anisotropic graphene aerogel.

[0050] Examples 12-14 differ from Example 1 in that the temperature and time of graphitization are different in the preparation of anisotropic graphene aerogel.

[0051] Table 1, Composition of polyacrylonitrile and graphene oxide and process parameters of Examples 1-14

[0052]

[0053]

[0054] Comparative Example 1

[0055] Comparative Example 1

[0056] Comparative Example 1 differs from Example 1 in that the graphene oxide is not prepared into graphene aerogel in Comparative Example 1.

[0057] Comparative Example 2 differs from Example 1 in that the graphene aerogel is not prepared by freeze-drying in the preparation of the anisotropic graphene aerogel.

[0058] Comparative Example 3 differs from Example 1 in that the graphene aerogel is not prepared by high-temperature carbonization in the preparation of the anisotropic graphene aerogel.

[0059] Comparative Example 4 differs from Example 1 in that the graphene aerogel is not prepared by graphitization in the preparation of the anisotropic graphene aerogel.

[0060] Performance detection test

[0061] To further study the influence of each component and preparation parameter on the moisture-permeable bamboo fiber quilt core, the present application further carries out the following examples for verification. And the detection data is arranged into a table, which is arranged as follows.

[0062] According to Examples 1-14 and Comparative Examples 1-4, the graphene functional fabric prepared in each example and each comparative example is subjected to ultraviolet aging resistance performance evaluation. The graphene functional fabric is fixed on a support and is subjected to direct irradiation of ultraviolet light in an ultraviolet light box (power 50W), and the test is carried out under the conditions of standard atmospheric temperature: 23℃±2℃, relative humidity: 50%±4%. The modulus retention rate, tensile strength retention rate, air permeability and antibacterial performance of the graphene functional fabric after different aging times of 0 days, 20 days and 100 days are detected.

[0063] 1. Modulus retention rate: Instron universal material tester 34SC-1 tests the modulus of the graphene functional fabric after different times of ultraviolet irradiation, and the modulus of the graphene functional fabric not irradiated by ultraviolet light is taken as 100%.

[0064] 2. Tensile strength retention rate: Instron universal material tester 34SC-1 tests the strength of the graphene functional fabric after different times of ultraviolet irradiation, and the strength of the graphene functional fabric not irradiated by ultraviolet light is taken as 100%.

[0065] 3. Air permeability test: According to the national standard GB / T 5453-1997, the sample pressure difference is 150 Pa, under the constant temperature and humidity conditions of temperature 25° and humidity 60%, the air permeability of graphene functional fabric of examples 1-14 and comparative examples 1-4 is tested by using a full-automatic air permeability tester.

[0066] 4. Antibacterial property test: According to GB / T20944.3-2008 "Evaluation of antibacterial property of textiles Part 3: oscillation method", E. coli ATCC 8099, Candida albicans ATCC 10231 and Staphylococcus aureus ATCC 6538 are used as test bacteria, and the antibacterial rate in this example is the average value of the antibacterial rates of the three bacteria.

[0067] Table 2, performance test data table of graphene functional fabric of examples 1-14 under 0 days of ultraviolet irradiation

[0068]

[0069]

[0070] Table 3, performance test data table of graphene functional fabric of examples 1-14 under 20 days of ultraviolet irradiation

[0071]

[0072] Table 4, performance test data table of graphene functional fabric of examples 1-14 under 100 days of ultraviolet irradiation

[0073]

[0074]

[0075] From the analysis of examples 1-14 and comparative examples 1 in table 1, it can be obtained that the graphene functional fabric prepared by using graphene aerogel prepared from graphene oxide has good air permeability and excellent antibacterial property; at the same time, combined with the analysis of comparative examples 2-4, it is necessary to freeze dry, high temperature carbonization and graphitization of the dispersion liquid of polyacrylonitrile and graphene oxide in the preparation process of anisotropic graphene aerogel. The graphene functional fabric obtained by the above steps has certain air permeability and antibacterial property, but there is a slight gap between it and examples 1-14. This is because the three-dimensional skeleton of carbon polymer polyacrylonitrile is synthesized into graphene, and the graphene aerogel is fixed by freezing.

[0076] In addition, in connection with Table 3 and Table 4, as the days of fixing the graphene functional fabric on the support and irradiating on the ultraviolet light box become more and more, the modulus retention rate of the graphene functional fabric will gradually decrease, and the tensile strength retention rate will also become lower and lower. However, according to the analysis of the graphene functional fabric obtained according to the same embodiment, the silk fibroin support treated by the anisotropic graphene aerogel can improve the function of ultraviolet resistance; and due to the unidirectional freezing technology, a long-range ordered vertical orientation structure is constructed, so that the antibacterial performance and the air permeability of the fabric decrease at a lower rate as the days of irradiation on the ultraviolet light box become more and more, compared with the unmodified fabric, the improvement is obvious.

[0077] In addition, according to the embodiments 1-5, the weight ratio between the polyacrylonitrile and the graphene oxide in the preparation of the anisotropic graphene aerogel is different, and the performance of the graphene functional fabric prepared finally is also different, wherein when the weight ratio between the polyacrylonitrile and the graphene oxide is 5:1, the three-dimensional skeleton of the carbon polymer polyacrylonitrile synthesizing graphene can help the graphene aerogel to be fixed with the silk fiber in the subsequent process, thereby improving the various performances of the graphene functional fabric.

[0078] In addition, in the embodiments 6-14, by adjusting the process parameters of freeze-drying, high-temperature carbonization and graphitization in the preparation of the anisotropic graphene aerogel, the filling content of graphene in the composite material can be maximally reduced, thereby retaining the various characteristics of the composite material. When the polyacrylonitrile and the graphene oxide suspension are completely frozen, freeze-drying is carried out at-60℃ and 2Pa for 2h; and the freeze-dried composite aerogel is placed in a tube furnace filled with argon, high-temperature carbonization is carried out at 1000℃ for 3h; and then the temperature is continued to rise to 2800℃ for 3h for graphitization. By using the above preparation method, the graphene functional fabric obtained can retain good performance.

[0079] In addition, the preparation process of the graphene silk fibroin support is modified in the present application, 1.3kg of anisotropic graphene aerogel with a mass fraction of 5% is added to the silk fibroin solution, and 50% of ethanol is added, when the graphene oxide is uniformly distributed on the surface of the silk fiber, the ethanol promotes the attachment of the sheet-shaped graphene oxide on the surface of the silk fiber. In addition, the mixed solution is pre-frozen at-20℃ for 3h, and then placed in a freeze dryer for freeze-drying treatment for 48h to obtain the graphene silk fibroin support, the three-dimensional skeleton of graphene is maintained by freeze-drying, thereby realizing the treatment of the graphene fabric, and the data in the embodiment 1 is obtained through multiple experiments, which is the optimal embodiment.

[0080] It should be noted that the above-mentioned embodiment sequences of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments. And the above describes the specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from the order in which they are recited, and still achieve desirable results. In certain embodiments, multitasking and parallel processing are also possible or can be advantageous.

[0081] The above only describes the preferred embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0082] The present application is merely an exemplary description of the present application, and is considered to cover any and all modifications, changes, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art can make various modifications and changes to the present application without departing from the scope of the present application. Thus, if these modifications and changes of the present application belong to the scope of the present application and its equivalents, the present application is intended to include these modifications and changes.

Claims

1. A method for preparing a graphene functional fabric, characterized in that: The following steps are involved: Synthesis of graphene oxide, preparation of anisotropic graphene aerogels, processing of silk fibers, preparation of graphene silk protein scaffolds, and molding of graphene functional fabrics; In the preparation process of the anisotropic graphene aerogel, the raw materials of the graphene aerogel mainly include polyacrylonitrile and graphene oxide. The dispersion of the polyacrylonitrile and the graphene oxide is subjected to unidirectional freezing, freeze drying, high-temperature carbonization and graphitization to obtain the anisotropic graphene aerogel.

2. The method for preparing a graphene functional fabric according to claim 1, wherein: In the step of synthesizing graphene oxide, a certain amount of graphite, sodium nitrate and concentrated sulfuric acid are mixed in proportion and stirred for a certain time, then a certain proportion of potassium permanganate is added to maintain the system reaction and stirring for a certain time, hydrogen peroxide is added to remove residual potassium permanganate, and then dilute hydrochloric acid and deionized water are used for acid washing and water washing to obtain graphite oxide slurry, and then the graphite oxide is ultrasonically exfoliated by an ultrasonic cell disruptor to obtain a graphene oxide rough embryo.

3. The method for preparing a graphene functional fabric according to claim 2, wherein: In the preparation process of the anisotropic graphene aerogel, the graphene aerogel scaffold is first pretreated, polyacrylonitrile is pre-oxidized in a reactor at a certain temperature, and the graphene oxide crude is dissolved in deionized water and mixed in the reactor for a certain time. After being homogenized in a high-speed disperser for a certain time, a uniformly mixed polyacrylonitrile and graphene oxide suspension is obtained.

4. The method for preparing a graphene functional fabric according to claim 3, wherein: The weight ratio of the polyacrylonitrile to the graphene oxide is (1-5): (1-5).

5. The method for preparing a graphene functional fabric according to claim 3, wherein: The polyacrylonitrile and graphene oxide suspension is transferred to a unidirectional freezing mold and unidirectionally frozen using liquid nitrogen. After the polyacrylonitrile and graphene oxide suspension is completely frozen, freeze-dried at a certain temperature and pressure. The freeze-dried composite aerogel is placed in a tubular furnace filled with argon and kept at 800-1200°C for a certain time for high-temperature carbonization. The temperature is then continued to rise to 2600-3000°C in a graphitization furnace and kept at this temperature for a certain time for graphitization to obtain anisotropic graphene aerogel.

6. The method for preparing a graphene functional fabric according to claim 5, wherein: In the silk fiber processing step, a certain mass of silk is pre-soaked in deionized water until it is completely soaked, and excess water on the surface is squeezed out, and then transferred to a steam pressure sterilizer, steam-treated at a certain temperature and pressure, followed by ultrasonic cleaning and drying, and then a certain amount of lithium bromide solution is added and dissolved at a certain temperature. The dissolved silk fibroin solution is placed in a dialysis bag and dialyzed for three days, and the silk fibroin solution is centrifuged in a high-speed centrifuge, and the obtained silk fibroin solution is stored at a low temperature.

7. The method for preparing a graphene functional fabric according to claim 6, wherein: In the preparation of the graphene silk protein scaffold, a certain amount of the anisotropic graphene aerogel is added to the silk fibroin solution according to a certain mass fraction, and a certain concentration of ethanol is added, and the solution is placed under ultrasonic oscillation for a certain time. The mixed solution is pre-frozen at a low temperature and then placed in a freeze dryer for freeze-drying to obtain the graphene silk protein scaffold.

8. The method for preparing a graphene functional fabric according to claim 7, wherein: In the forming step of the graphene functional fabric, the graphene silk protein scaffold is dissolved in deionized water, the mixed solution is stirred at a certain temperature for a certain time, and the pH is adjusted within a certain range to obtain an impregnation solution; and the finished cotton fabric is immersed in the impregnation solution, heated, immersed, and baked. After baking, the fabric is washed with water and dried to constant weight to obtain the graphene functional fabric.

9. A lightweight warm-keeping fabric produced by the method for producing a graphene functional fabric according to any one of claims 1 to 8.

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