A far-infrared heating slurry based on graphene and preparation method thereof

Abstract

The invention discloses a graphene-based far-infrared heating slurry and a preparation method thereof. The far-infrared heating slurry comprises the following raw materials in parts by weight: 40-50 parts of reinforcing filler, 50-60 parts of terpineol, 5-6 parts of ethyl cellulose, 1-3 parts of quartz sand, 0.2-0.5 parts of boric acid, 0.2-0.5 parts of sodium nitrate, 0.5-1 parts of calcium oxide, and 0.5-1 parts of calcium carbonate; the modified matrix has a core-shell structure, and the internal core is a three-dimensional graphene-loaded zinc oxide. When subjected to far-infrared radiation, the core absorbs far-infrared radiation, causing internal molecules and atoms to resonate, vibrate, and rotate, thereby increasing the core temperature and transferring the core heat to the external shell, thereby enhancing the shell's absorption of far-infrared radiation. At the same time, a cage-type polysilsesquioxane between the core and shell forms a cavity, thereby preventing rapid heat dissipation and ensuring continuous heating of the slurry.

Description

Technical Field

[0001] The present invention relates to the technical field of heating material preparation, and in particular to a graphene-based far-infrared heating slurry and a preparation method thereof. Background Art

[0002] With the advancement of information technology and electronics, daily necessities such as electric blankets, hand warmers, and heat packs are constantly being upgraded, increasingly impacting people's daily lives. Carbon electric heaters, the ideal base material for heating products in today's harsh winters, are experiencing a growing market driven by the development of these products. Furthermore, carbon electric heaters have broad application prospects in military clothing, human health care, heating sources for the interior walls of houses in cold regions, and heat sources for greenhouses and nurseries. Especially in the areas of human warmth and health care, the safety and health benefits of electric heating products make the development of far-infrared carbon electric heaters an inevitable trend. my country has designated the research and development of far-infrared carbon electric heaters as a key research project. Therefore, the development and design of far-infrared carbon electric heater preparation processes and related raw materials holds great promise. Summary of the Invention

[0003] The purpose of the present invention is to provide a far-infrared heating paste based on graphene and a preparation method thereof, so as to solve the problem that the far-infrared heating paste at the current stage has low infrared absorption efficiency and poor heat generation effect.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a far-infrared heating slurry based on graphene, comprising the following steps:

[0006] Step S1: Weigh the following powder raw materials by weight: 40-50 parts of reinforcing filler, 50-60 parts of terpineol, 5-6 parts of ethyl cellulose, 1-3 parts of quartz sand, 0.2-0.5 parts of boric acid, 0.2-0.5 parts of sodium nitrate, 0.5-1 parts of calcium oxide, and 0.5-1 parts of calcium carbonate;

[0007] Step S2: Ethyl cellulose and terpineol are mixed evenly, stirred at a speed of 200-300 r / min and a temperature of 60-70°C until completely dissolved, and then reinforcing filler, quartz sand, boric acid, sodium nitrate, calcium oxide and calcium carbonate are added and ball-milled evenly to obtain a far-infrared heating slurry.

[0008] Furthermore, the reinforcing filler is prepared by the following steps:

[0009] Step A1: 2-aminobenzenesulfonic acid and 2-aminostyrene are added to a hydrochloric acid solution, stirred at a speed of 150-200 r / min and a temperature of 0-3°C, and aniline and ammonium persulfate are added. After reacting for 4-6 hours, the mixture is washed with deionized water until neutral, and then dried to obtain modified polyaniline;

[0010] Step A2: dissolving the modified polyaniline in DMF, adding the modified matrix, ultrasonically treating the mixture at a frequency of 40-50 kHz for 1-1.5 hours, irradiating the mixture with ultraviolet light for 1-1.5 hours, filtering and removing the filtrate, and drying the substrate to obtain a reinforcing filler.

[0011] Furthermore, the mass ratio of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline in step A1 is 1.2:0.3:8, and the amount of ammonium persulfate used is 0.5-0.7% of the total mass of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline.

[0012] Furthermore, the usage ratio of the modified polyaniline, DMF and modified matrix described in step A2 is 10 g:150 mL:1-1.5 g.

[0013] Furthermore, the modified matrix is prepared by the following steps:

[0014] Step B1: dispersing graphene oxide in deionized water, stirring at a speed of 200-300 rpm and a temperature of 20-25°C, adding ascorbic acid, stirring for 1-1.5 hours, stopping stirring and heating to 90-95°C, keeping warm for 2-3 hours, adding zinc nitrate hexahydrate, ultrasonically treating at a frequency of 20-30 kHz for 10-15 minutes, adding ammonia water to adjust the pH to 9, heating to 50-60°C, keeping warm for 2-2.5 hours, filtering and removing the filtrate, and calcining the substrate at a temperature of 400-420°C for 2-3 hours to obtain a composite material;

[0015] Step B2: The composite material is dispersed in deionized water, KH550 is added, and the mixture is stirred at a speed of 150-200 r / min for 2-3 hours. The filtrate is filtered and removed. The substrate is dispersed in toluene, KH560 is added, and the mixture is stirred at a speed of 200-300 r / min, a temperature of 20-25° C., and a pH of 10-11 for 4-5 hours. The mixture is adjusted to neutral, octadecyltrimethoxysilane and ammonium fluoride are added, and the reaction is continued for 20-25 hours. The mixture is then kept warm at a temperature of 80-85° C. for 6-8 days to obtain a pretreated composite material.

[0016] Step B3: Disperse the pretreated composite material in ethanol, add deionized water and ammonia water, stir and add ethyl orthosilicate at a speed of 200-300 r / min and a temperature of 35-40°C, stir for 20-24 hours, then add 3-mercaptopropyltriethoxysilane, continue stirring for 20-24 hours, centrifuge to remove the supernatant, wash the substrate with ethanol, and then dry to obtain a modified matrix.

[0017] Furthermore, the amount ratio of graphene oxide, deionized water, ascorbic acid and zinc nitrate hexahydrate described in step B1 is 4 mg:2 mL:32 mg:1 mg.

[0018] Furthermore, the amount of KH550 in step B2 is 3-5% of the mass of the composite material, the molar ratio of KH550 to KH560 is 1:1, and the amount ratio of the composite material, octadecyltrimethoxysilane and ammonium fluoride is 2g:1.5mL:0.3g.

[0019] Furthermore, the usage ratio of the pretreated composite material, ethanol, deionized water, ammonia water, ethyl orthosilicate and 3-mercaptopropyltriethoxysilane in step B3 is 1 g:80 mL:15 mL:5 mL:5 mL:0.25 mL.

[0020] Beneficial effects of the present invention: A graphene-based far-infrared heating paste prepared by the present invention comprises the following raw materials: reinforcing filler, terpineol, ethyl cellulose, quartz sand, boric acid, sodium nitrate, calcium oxide and calcium carbonate, wherein the reinforcing filler is made of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline, and is polymerized under the action of ammonium persulfate to form polyaniline having a sulfonic acid group and a double bond in the side chain to obtain modified polyaniline, and the modified polyaniline is dissolved in DMF, and the modified matrix is added and treated with ultraviolet light to make the side chain of the modified polyaniline The double bonds of the modified matrix are grafted with the thiol groups on the surface of the modified matrix to obtain a reinforcing filler. The modified matrix uses graphene oxide as a raw material and first undergoes an oxidation-reduction reaction with ascorbic acid, so that the graphene oxide forms a three-dimensional graphene gel during the test process. Then, zinc nitrate hexahydrate is added, and under the action of ammonia water, zinc oxide is formed and loaded on the three-dimensional graphene gel. Finally, it is calcined to obtain a composite material. The composite material is surface treated with KH550 to load amino groups on the surface of the composite material. KH560 is added and adjusted to alkaline conditions so that KH5 The epoxy groups on 60 react with active amino groups, and then octadecyltrimethoxysilane is added with ammonium fluoride as a catalyst to form a cage-type polysilsesquioxane on the surface of the composite material to prepare a pretreated composite material. The pretreated composite material is then dispersed in ethanol, deionized water and ammonia water are added, and ethyl orthosilicate and 3-mercaptopropyltriethoxysilane are added dropwise. Mercapto nano-silica is coated on the surface of the pretreated composite material to prepare a modified matrix. The modified matrix is a core-shell structure, and the internal core is three-dimensional graphene-loaded zinc oxide. When far-infrared radiation is applied, the core absorbs far-infrared radiation and the internal molecules and atoms resonate, vibrate and rotate, thereby increasing the core temperature. The heat of the core is transferred to the external shell, thereby enhancing the shell's absorption of far-infrared radiation. At the same time, the cage-type polysilsesquioxane between the core and shell forms a cavity, thereby preventing the rapid dissipation of heat and ensuring the continuous heating of the slurry. The surface of the reinforcing filler is coated with polyaniline and the side chain of the polyaniline contains sulfonic acid groups, which effectively avoids the problem of agglomeration of the reinforcing filler in the slurry and makes the slurry more dispersed. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] Example 1

[0023] A method for preparing a far-infrared heating slurry based on graphene, comprising the following steps:

[0024] Step S1: Weigh the following powder raw materials by weight: 40 parts of reinforcing filler, 50 parts of terpineol, 5 parts of ethyl cellulose, 1 part of quartz sand, 0.2 parts of boric acid, 0.2 parts of sodium nitrate, 0.5 parts of calcium oxide and 0.5 parts of calcium carbonate;

[0025] Step S2: Ethyl cellulose and terpineol are mixed evenly, stirred at a speed of 200 r / min and a temperature of 60°C until completely dissolved, and then reinforcing filler, quartz sand, boric acid, sodium nitrate, calcium oxide and calcium carbonate are added and ball-milled evenly to obtain a far-infrared heating slurry.

[0026] The reinforcing filler is prepared by the following steps:

[0027] Step A1: 2-aminobenzenesulfonic acid and 2-aminostyrene were added to a hydrochloric acid solution, stirred at a speed of 150 rpm and a temperature of 0°C, and aniline and ammonium persulfate were added. The mixture was reacted for 4 hours, washed with deionized water until neutral, and then dried to obtain modified polyaniline.

[0028] Step A2: dissolving the modified polyaniline in DMF, adding the modified matrix, ultrasonically treating at a frequency of 40 kHz for 1 hour, irradiating with ultraviolet light for 1 hour, filtering and removing the filtrate, and drying the substrate to obtain a reinforcing filler.

[0029] The mass ratio of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline in step A1 is 1.2:0.3:8, and the amount of ammonium persulfate used is 0.5% of the total mass of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline.

[0030] The amount ratio of the modified polyaniline, DMF and modified matrix described in step A2 is 10g:150mL:1g.

[0031] The modified matrix is prepared by the following steps:

[0032] Step B1: Graphene oxide was dispersed in deionized water, stirred at a speed of 200 rpm and a temperature of 20°C, and ascorbic acid was added. After stirring for 1 hour, stirring was stopped and the temperature was raised to 90°C. After being kept warm for 2 hours, zinc nitrate hexahydrate was added. After ultrasonic treatment at a frequency of 20 kHz for 10 minutes, ammonia water was added to adjust the pH value to 9, the temperature was raised to 50°C, and the temperature was kept warm for 2 hours. The filtrate was removed by filtration, and the substrate was calcined at a temperature of 400°C for 2 hours to obtain a composite material.

[0033] Step B2: The composite material was dispersed in deionized water, KH550 was added, and the mixture was stirred at a speed of 150 r / min for 2 hours. The filtrate was removed by filtration, and the substrate was dispersed in toluene. KH560 was added, and the mixture was stirred at a speed of 200 r / min, a temperature of 20°C, and a pH of 10 for 4 hours. The mixture was adjusted to neutral, octadecyltrimethoxysilane and ammonium fluoride were added, and the reaction was continued for 20 hours. The mixture was then kept warm at a temperature of 80°C for 6 days to obtain a pretreated composite material.

[0034] Step B3: Disperse the pretreated composite material in ethanol, add deionized water and ammonia water, stir and add ethyl orthosilicate at a speed of 200 r / min and a temperature of 35°C, stir for 20 hours, then add 3-mercaptopropyltriethoxysilane, continue stirring for 20 hours, centrifuge to remove the supernatant, wash the substrate with ethanol, and then dry to obtain a modified matrix.

[0035] The amount ratio of graphene oxide, deionized water, ascorbic acid and zinc nitrate hexahydrate described in step B1 is 4 mg:2 mL:32 mg:1 mg.

[0036] The amount of KH550 used in step B2 is 3-5% of the mass of the composite material, the molar ratio of KH550 to KH560 is 1:1, and the amount ratio of the composite material, octadecyltrimethoxysilane and ammonium fluoride is 2g:1.5mL:0.3g.

[0037] The amount ratio of the pretreated composite material, ethanol, deionized water, ammonia water, ethyl orthosilicate and 3-mercaptopropyltriethoxysilane described in step B3 is 1 g:80 mL:15 mL:5 mL:5 mL:0.25 mL.

[0038] Example 2

[0039] A method for preparing a far-infrared heating slurry based on graphene, comprising the following steps:

[0040] Step S1: Weigh the following powder raw materials by weight: 45 parts of reinforcing filler, 55 parts of terpineol, 5.5 parts of ethyl cellulose, 2 parts of quartz sand, 0.3 parts of boric acid, 0.3 parts of sodium nitrate, 0.8 parts of calcium oxide and 0.8 parts of calcium carbonate;

[0041] Step S2: Ethyl cellulose and terpineol are mixed evenly, stirred at a speed of 200 r / min and a temperature of 65°C until completely dissolved, and then reinforcing filler, quartz sand, boric acid, sodium nitrate, calcium oxide and calcium carbonate are added and ball-milled evenly to obtain a far-infrared heating slurry.

[0042] The reinforcing filler is prepared by the following steps:

[0043] Step A1: 2-aminobenzenesulfonic acid and 2-aminostyrene were added to a hydrochloric acid solution, stirred at a speed of 150 rpm and a temperature of 2°C, and aniline and ammonium persulfate were added. After reacting for 5 hours, the mixture was washed with deionized water until neutral, and then dried to obtain modified polyaniline.

[0044] Step A2: dissolving the modified polyaniline in DMF, adding the modified matrix, ultrasonically treating at a frequency of 45 kHz for 1.5 hours, irradiating with ultraviolet light for 1 hour, filtering and removing the filtrate, and drying the substrate to obtain a reinforcing filler.

[0045] The mass ratio of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline in step A1 is 1.2:0.3:8, and the amount of ammonium persulfate used is 0.6% of the total mass of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline.

[0046] The amount ratio of the modified polyaniline, DMF and modified matrix described in step A2 is 10g:150mL:1.3g.

[0047] The modified matrix is prepared by the following steps:

[0048] Step B1: Graphene oxide was dispersed in deionized water, stirred at a speed of 200 rpm and a temperature of 23°C, and ascorbic acid was added. After stirring for 1.3 hours, stirring was stopped and the temperature was raised to 93°C. After being kept warm for 2.5 hours, zinc nitrate hexahydrate was added. After ultrasonic treatment at a frequency of 25 kHz for 13 minutes, ammonia water was added to adjust the pH to 9, the temperature was raised to 55°C, and the temperature was kept warm for 2.3 hours. The filtrate was removed by filtration, and the substrate was calcined at a temperature of 410°C for 2.5 hours to obtain a composite material.

[0049] Step B2: The composite material was dispersed in deionized water, KH550 was added, and the mixture was stirred at a speed of 150 r / min for 2.5 hours. The filtrate was filtered and removed. The substrate was dispersed in toluene, KH560 was added, and the mixture was stirred at a speed of 200 r / min, a temperature of 25°C, and a pH of 10 for 4.5 hours. The mixture was adjusted to neutral, octadecyltrimethoxysilane and ammonium fluoride were added, and the reaction was continued for 25 hours. The mixture was then kept warm at 80°C for 7 days to obtain a pretreated composite material.

[0050] Step B3: Disperse the pretreated composite material in ethanol, add deionized water and ammonia water, stir and add ethyl orthosilicate at a speed of 200 r / min and a temperature of 38°C, stir for 22 hours, then add 3-mercaptopropyltriethoxysilane, continue stirring for 22 hours, centrifuge to remove the supernatant, wash the substrate with ethanol, and then dry to obtain a modified matrix.

[0051] The amount ratio of graphene oxide, deionized water, ascorbic acid and zinc nitrate hexahydrate described in step B1 is 4 mg:2 mL:32 mg:1 mg.

[0052] The amount of KH550 used in step B2 is 4% of the mass of the composite material, the molar ratio of KH550 to KH560 is 1:1, and the amount ratio of the composite material, octadecyltrimethoxysilane and ammonium fluoride is 2g:1.5mL:0.3g.

[0053] The amount ratio of the pretreated composite material, ethanol, deionized water, ammonia water, ethyl orthosilicate and 3-mercaptopropyltriethoxysilane described in step B3 is 1 g:80 mL:15 mL:5 mL:5 mL:0.25 mL.

[0054] Example 3

[0055] A method for preparing a far-infrared heating slurry based on graphene, comprising the following steps:

[0056] Step S1: Weigh the following powder raw materials by weight: 50 parts of reinforcing filler, 60 parts of terpineol, 6 parts of ethyl cellulose, 3 parts of quartz sand, 0.5 parts of boric acid, 0.5 parts of sodium nitrate, 1 part of calcium oxide and 1 part of calcium carbonate;

[0057] Step S2: Ethyl cellulose and terpineol are mixed evenly, stirred at a speed of 300 r / min and a temperature of 70°C until completely dissolved, and then reinforcing filler, quartz sand, boric acid, sodium nitrate, calcium oxide and calcium carbonate are added and ball-milled evenly to obtain a far-infrared heating slurry.

[0058] The reinforcing filler is prepared by the following steps:

[0059] Step A1: 2-aminobenzenesulfonic acid and 2-aminostyrene were added to a hydrochloric acid solution, stirred at 200 rpm and 3°C, and aniline and ammonium persulfate were added. The mixture was reacted for 6 hours, washed with deionized water until neutral, and then dried to obtain modified polyaniline.

[0060] Step A2: dissolving the modified polyaniline in DMF, adding the modified matrix, ultrasonically treating at a frequency of 50 kHz for 1.5 h, irradiating with ultraviolet light for 1.5 h, filtering and removing the filtrate, and drying the substrate to obtain a reinforcing filler.

[0061] The mass ratio of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline in step A1 is 1.2:0.3:8, and the amount of ammonium persulfate used is 0.7% of the total mass of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline.

[0062] The amount ratio of the modified polyaniline, DMF and modified matrix described in step A2 is 10g:150mL:1.5g.

[0063] The modified matrix is prepared by the following steps:

[0064] Step B1: Graphene oxide was dispersed in deionized water, stirred at a speed of 300 rpm and a temperature of 25°C, and ascorbic acid was added. After stirring for 1.5 hours, stirring was stopped and the temperature was raised to 95°C. After being kept warm for 3 hours, zinc nitrate hexahydrate was added. After ultrasonic treatment at a frequency of 30 kHz for 15 minutes, ammonia water was added to adjust the pH value to 9, the temperature was raised to 60°C, and the temperature was kept warm for 2.5 hours. The filtrate was removed by filtration, and the substrate was calcined at a temperature of 420°C for 3 hours to obtain a composite material.

[0065] Step B2: The composite material was dispersed in deionized water, KH550 was added, and the mixture was stirred at a speed of 200 rpm for 3 hours. The filtrate was removed by filtration, and the substrate was dispersed in toluene. KH560 was added, and the mixture was stirred at a speed of 300 rpm, a temperature of 25°C, and a pH of 11 for 5 hours. The mixture was adjusted to neutral, octadecyltrimethoxysilane and ammonium fluoride were added, and the reaction was continued for 25 hours. The mixture was then kept warm at a temperature of 85°C for 8 days to obtain a pretreated composite material.

[0066] Step B3: Disperse the pretreated composite material in ethanol, add deionized water and ammonia water, stir and add ethyl orthosilicate at a speed of 300 r / min and a temperature of 40°C, stir for 24 hours, then add 3-mercaptopropyltriethoxysilane, continue stirring for 24 hours, centrifuge to remove the supernatant, wash the substrate with ethanol, and then dry to obtain a modified matrix.

[0067] The amount ratio of graphene oxide, deionized water, ascorbic acid and zinc nitrate hexahydrate described in step B1 is 4 mg:2 mL:32 mg:1 mg.

[0068] The amount of KH550 used in step B2 is 3-5% of the mass of the composite material, the molar ratio of KH550 to KH560 is 1:1, and the amount ratio of the composite material, octadecyltrimethoxysilane and ammonium fluoride is 2g:1.5mL:0.3g.

[0069] The amount ratio of the pretreated composite material, ethanol, deionized water, ammonia water, ethyl orthosilicate and 3-mercaptopropyltriethoxysilane described in step B3 is 1 g:80 mL:15 mL:5 mL:5 mL:0.25 mL.

[0070] Comparative Example 1

[0071] Compared with Example 1, this comparative example uses a modified matrix instead of a reinforcing filler, and the remaining steps are the same.

[0072] Comparative Example 2

[0073] Compared with Example 1, this comparative example uses a composite material instead of the pretreated composite material, and the other steps are the same.

[0074] A 500W infrared heating lamp (0.76-5μm, peak at 4μm) was used as a heater, and a Japanese AviO infrared imager R300 was used. 15g of the slurries prepared in Examples 1-3 and Comparative Examples 1-2 were added to culture dishes with a diameter of 3cm to prepare samples. The samples were placed on a heat-insulating table and irradiated with an infrared heating lamp at a distance of 50cm from the samples. The heating process was recorded with the infrared imager. The results are shown in the following table.

[0075]

[0076] It can be seen from the above table that the far-infrared heating pastes prepared in Examples 1-3 have good heating effects.

[0077] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a far-infrared heating slurry based on graphene, characterized in that: The specific steps include: Step S1: Weigh the following raw materials in parts by weight: 40-50 parts of reinforcing filler, 50-60 parts of terpineol, 5-6 parts of ethyl cellulose, 1-3 parts of quartz sand, 0.2-0.5 parts of boric acid, 0.2-0.5 parts of sodium nitrate, 0.5-1 parts of calcium oxide, and 0.5-1 parts of calcium carbonate; Step S2: Ethyl cellulose and terpineol are mixed uniformly, stirred at a speed of 200-300 r / min and a temperature of 60-70°C until completely dissolved, and then reinforcing filler, quartz sand, boric acid, sodium nitrate, calcium oxide and calcium carbonate are added and ball-milled uniformly to prepare a far-infrared heating slurry; The reinforcing filler is prepared by the following steps: Step A1: adding 2-aminobenzenesulfonic acid and 2-aminostyrene to a hydrochloric acid solution, stirring, and adding aniline and ammonium persulfate. After reaction, washing with deionized water until neutral, and drying to obtain modified polyaniline; Step A2: dissolving the modified polyaniline in DMF, adding the modified matrix, ultrasonically treating, irradiating with ultraviolet light (UV), filtering to remove the filtrate, and drying the substrate to obtain a reinforcing filler; The modified matrix is prepared by the following steps: Step B1: dispersing graphene oxide in deionized water, stirring and adding ascorbic acid, stopping stirring and heating and maintaining the temperature, adding zinc nitrate hexahydrate, ultrasonicating, adding ammonia water to adjust the pH value to alkaline, heating and maintaining the temperature, filtering and removing the filtrate, and calcining the substrate to obtain a composite material; Step B2: Dispersing the composite material in deionized water, adding KH550, stirring, filtering and removing the filtrate, dispersing the substrate in toluene, adding KH560, stirring, adjusting to neutrality, adding octadecyltrimethoxysilane and ammonium fluoride, continuing the reaction, and then heating and maintaining the temperature to obtain a pretreated composite material; Step B3: Disperse the pretreated composite material in ethanol, add deionized water and ammonia water, stir and add ethyl orthosilicate, stir, then add 3-mercaptopropyltriethoxysilane, continue stirring, centrifuge to remove the supernatant, wash the substrate with ethanol, and then dry to obtain a modified matrix.

2. The method for preparing a graphene-based far-infrared heating slurry according to claim 1, characterized in that: The mass ratio of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline in step A1 is 1.2:0.3:8, and the amount of ammonium persulfate used is 0.5-0.7% of the total mass of 2-aminobenzenesulfonic acid, 2-aminostyrene and aniline.

3. The method for preparing a graphene-based far-infrared heating slurry according to claim 1, characterized in that: The amount ratio of the modified polyaniline, DMF and modified matrix described in step A2 is 10g:150mL:1-1.5g.

4. The method for preparing a graphene-based far-infrared heating slurry according to claim 1, wherein: The amount ratio of graphene oxide, deionized water, ascorbic acid and zinc nitrate hexahydrate described in step B1 is 4 mg:2 mL:32 mg:1 mg.

5. The method for preparing a graphene-based far-infrared heating slurry according to claim 1, characterized in that: The amount of KH550 used in step B2 is 3-5% of the mass of the composite material, the molar ratio of KH550 and KH560 is 1:1, and the amount ratio of the composite material, octadecyltrimethoxysilane and ammonium fluoride is 2g:1.5mL:0.3g.

6. The method for preparing a graphene-based far-infrared heating slurry according to claim 1, characterized in that: The usage ratio of the pretreated composite material, ethanol, deionized water, ammonia water, ethyl orthosilicate and 3-mercaptopropyltriethoxysilane described in step B3 is 1 g:80 mL:15 mL:5 mL:5 mL:0.25 mL.

7. A far-infrared heating paste based on graphene, characterized in that: Prepared according to any one of claims 1 to 6.

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