Graphene heating film-aerogel composite floor heating and preparation method thereof

Abstract

The present invention discloses a graphene heating film-aerogel composite floor heating, comprising a composite floor heating body, wherein the composite floor heating body is composed of a leakage current recovery layer (2), a graphene heating film layer (1), and an aerogel reflective insulation layer (3) stacked in sequence from top to bottom, and the composite floor heating body is vacuum-enclosed in a waterproof insulation protective envelope (4). The present invention also provides a method for preparing the graphene heating film-aerogel composite floor heating; an insulating bottom layer, a graphene heating carbon slurry layer, and a hot melt adhesive insulating surface layer are combined to form a graphene heating film layer (1), and the aerogel reflective insulation layer (3) is an aerogel felt coated with aluminum foil on one side. The present invention can not only effectively prevent the heat of the floor heating film from being lost downward, but also greatly reduce the occupation of indoor space.

Description

Technical Field

[0001] The present invention belongs to the technical field of graphene heating, and in particular relates to a graphene heating film-aerogel composite floor heating and a preparation method thereof. Background Art

[0002] Electric heating, as a new heating technology, has been gaining increasing attention in recent years. Graphene floor heating film, as a new electric heating method, has received widespread attention in the market. Its superior heating performance and convenient installation method have made electric heating more accessible to people and are likely to promote its development.

[0003] Aerogel is a new type of thermal insulation material, boasting advantages such as lightness, safety, environmental friendliness, ultra-high heat resistance, and superior thermal insulation. Its maximum operating temperature reaches 200°C, and its thermal conductivity at room temperature is between 0.025-0.028 W / m·K. Its excellent performance has led to its increasing recognition in the thermal insulation field.

[0004] Graphene floor heating film has been widely researched and developed. Patent application number 202011354098.2 discloses a graphene slurry and an electric heating coating and electric heating film made therefrom, as well as the use of the electric heating coating and electric heating film in electric heating. The floor heating film prepared by this method has a large change in aging power. After a period of use, the heating temperature does not meet the requirements and the heating effect is poor. Patent application number 202010527220.5 discloses a method for preparing graphene electric heating film for floor heating. The packaging process used in this invention is relatively simple and the sealing effect is poor, which results in the floor heating film being relatively lacking in waterproofness and moisture resistance. There are safety hazards in long-term use, and the life of the floor heating film is not long enough. Patent application number 201910868466.6 discloses a method for producing graphene electric heating film. This invention's graphene floor heating film lacks internal insulation, requiring external insulation materials to be applied during installation. To meet these requirements, the traditional external insulation layer is a 2.5cm thick polystyrene insulation board. This makes installation inconvenient, and the thicker external insulation board increases the height of the interior, impacting the space. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a graphene heating film-aerogel composite floor heating and a preparation method thereof, which are used to solve the problems of large power attenuation, insufficient lifespan and large floor height occupied by existing floor heating films.

[0006] In order to solve the above technical problems, the present invention provides a graphene heating film-aerogel composite floor heating, including a composite floor heating body, which is composed of a leakage current recovery layer, a graphene heating film layer and an aerogel reflective insulation layer stacked in sequence from top to bottom. The composite floor heating body is vacuum-enclosed in a waterproof insulating protective envelope.

[0007] The present invention also provides a method for preparing the above-mentioned graphene heating film-aerogel composite floor heating, comprising the following steps:

[0008] 1) Preparation of graphene heating film layer:

[0009] A graphene heating carbon paste is printed on the insulating base layer to form a graphene heating carbon paste layer, wherein the edge of the graphene heating carbon paste layer is spaced 10 to 15 mm from the corresponding edge of the insulating base layer; that is, the cross-section of the insulating base layer is larger than the cross-section of the graphene heating carbon paste layer;

[0010] A silver paste electrode (conductive silver paste electrode) connected to the graphene heating carbon paste layer is arranged on both sides of the graphene heating carbon paste layer; then a hot melt adhesive insulating surface layer that can completely cover the graphene heating carbon paste layer and the silver paste electrode is arranged to form a graphene heating film layer;

[0011] The thickness of the graphene heating carbon paste layer is 0.03±0.01mm;

[0012] The size of the hot melt adhesive insulation surface layer is equal to the size of the insulation bottom layer;

[0013] 2) Set up leakage current recovery layer:

[0014] The leakage current recovery layer is tightly attached to the hot melt adhesive insulation surface of the graphene heating film layer, and the area of ​​the leakage current recovery layer is 80±5% of the hot melt adhesive insulation surface;

[0015] The thickness of the leakage current recovery layer is 0.5±0.05mm;

[0016] Note: The leakage current recovery layer coincides with the center point of the graphene heating film layer;

[0017] 3) Lamination of aerogel reflective insulation layer:

[0018] The aerogel reflective insulation layer is a thin aerogel felt covered with aluminum foil on one side. The aluminum foil of the aerogel reflective insulation layer is tightly attached to the insulating bottom layer of the graphene heating film layer. Thus, the leakage current recovery layer, the graphene heating film layer and the aerogel reflective insulation layer are combined to form the composite floor heating body.

[0019] The thickness of the aerogel reflective insulation layer (3) is 5±0.05 mm, i.e. (aluminum foil is about 0.5 mm, aerogel felt is about 4.5 mm);

[0020] The size of the aerogel reflective insulation layer (3) is the same as the insulating bottom layer of the graphene heating film layer (1);

[0021] 4) Vacuum packaging of waterproof insulation protective layer:

[0022] The composite floor heating body prepared in step 3) is placed in a waterproof insulating protective envelope (4), and then vacuumed (the vacuum degree is less than 133 Pa) to obtain a graphene heating film-aerogel composite floor heating.

[0023] As an improvement to the preparation method of the graphene heating film-aerogel composite floor heating of the present invention, the preparation method of the aerogel thin felt covered with aluminum foil on one side includes the following steps:

[0024] ①. Preparation of aerogel felt:

[0025] Cut a piece of glass fiber non-woven fabric (i.e., glass fiber cloth, 4.5 mm thick) of the same size as the insulating base layer, immerse it in a 5-10% polyvinyl alcohol (PVA) aqueous solution for 5±1 s, remove it, and place it in a 100±10°C oven to dry to constant weight to obtain a glass fiber non-woven fabric with PVA glue;

[0026] Next, silica sol was prepared by the sol-gel method: the glass fiber non-woven fabric with PVA glue was immersed in the silica sol for 5±1s, taken out and aged in an oven at 30-40°C for 1 day, then the solvent was replaced with ethanol in an oven at 50±5°C for 1 day, and then dried with CO2 supercritical fluid (45°C, 20MPa) for 6±1h to obtain an aerogel felt (aerogel non-woven fabric);

[0027] The silica sol is a dispersion of nano-sized silica particles in water with a mass concentration of 6±1%;

[0028] ②. Place aluminum foil (thickness 0.5 mm) of the same area on either side of the aerogel mat (aerogel nonwoven fabric) to obtain an aerogel mat with aluminum foil on one side.

[0029] Note: The same area of ​​single-sided self-adhesive aluminum foil (thickness 0.5mm) can be tightly bonded to either side of the aerogel non-woven fabric using a rolling process.

[0030] In order to better combine the non-woven fabric with PVA glue with the aerogel and achieve the advantages of uniform aerogel compounding and no powder falling, the subsequent steps are: the aluminum foil of the aerogel felt is tightly attached to the insulating bottom layer of the graphene heating film layer through a self-adhesive lamination process.

[0031] As a further improvement to the preparation method of the graphene heating film-aerogel composite floor heating of the present invention, in the step 1):

[0032] The insulating material used to prepare the insulating bottom layer is any one of the following: polyethylene terephthalate PET (preferred), polyimide PI, and biaxially oriented polyester BOPET;

[0033] The hot melt adhesive used to prepare the hot melt adhesive insulation surface layer is any of the following: vinyl acetate copolymer EVA hot melt adhesive (preferred), polyurethane TPU hot melt adhesive, copolyester PES hot melt adhesive.

[0034] Note: The melting temperature of the hot melt adhesive is 70-100°C, preferably 90°C.

[0035] The reason for choosing hot melt adhesive film with higher melting temperature is to take into account the safety of long-term use of heating film. The limit temperature of heating film for long-term underground use is about 85℃. The choice of 90℃ hot melt adhesive film can prevent the hidden dangers when the limit temperature occurs; 100℃ hot rolling makes the hot melt adhesive melt faster without damaging the PET layer, thereby speeding up production efficiency.

[0036] As a further improvement of the preparation method of the graphene heating film-aerogel composite floor heating of the present invention,

[0037] In the step 1):

[0038] The graphene heating carbon paste is printed on the insulating base layer by screen printing, and a silver paste electrode is printed on both ends of the formed graphene heating carbon paste layer by screen printing. Then, a hot melt adhesive insulating surface layer is sealed on the graphene heating carbon paste layer by hot rolling.

[0039] As a further improvement to the preparation method of the graphene heating film-aerogel composite floor heating of the present invention, in the step 2), the leakage current recovery layer is an aluminum foil with adhesive on one side, and the thickness of the aluminum foil is 0.5±0.05 mm;

[0040] The aluminum foil is tightly adhered to the hot melt adhesive insulating surface of the graphene heating film layer by rolling, and the area of ​​the aluminum foil is 80±5% of the area of ​​the hot melt adhesive insulating surface.

[0041] As a further improvement to the preparation method of the graphene heating film-aerogel composite floor heating of the present invention, in the step 4):

[0042] Use a vacuum pump to extract the air from the waterproof insulation protective envelope, and use a high-frequency heat press to seal the vacuum port;

[0043] The waterproof insulating protective envelope is made of a waterproof insulating protective layer with a thickness of approximately 0.8±0.08 mm.

[0044] As a further improvement to the preparation method of the graphene heating film-aerogel composite floor heating of the present invention: the material of the waterproof insulating protective layer is polyvinyl chloride PVC (preferred) or butyl rubber.

[0045] In the present invention: the thickness of the graphene heating film layer is about 1 mm.

[0046] The composite floor heating of the present invention is prepared by the processes of screen printing graphene heating film with graphene carbon paste, roller laminating leakage current recovery layer, self-adhesive laminating aerogel reflective insulation layer, vacuum packaging waterproof insulation protective layer and the like.

[0047] In the present invention: the graphene heating carbon paste is a high-emissivity negative ion-modified graphene heating carbon paste prepared using the patent "High-emissivity negative ion-modified graphene heating carbon paste and its preparation method" (application number is 202111448570.3).

[0048] The beneficial effects of the present invention are:

[0049] (1) The specific aerogel reflective insulation layer of the present invention (a thin aerogel felt covered with aluminum foil on one side) is composited into the interior of the floor heating film. This material has a low thermal conductivity and good thermal insulation effect. A thickness of 5mm can achieve the corresponding thermal insulation effect. It can effectively prevent the heat of the floor heating film from being lost downwards. This method effectively solves the shortcomings of existing external polystyrene insulation boards, such as occupying a high floor height and being resistant to temperature differences.

[0050] (2) The external insulation layer in the traditional installation process is built into the floor heating film. The new aerogel felt of the present invention is used to reduce the thickness from 3 cm to 5 mm without affecting the thermal conductivity, greatly reducing the indoor space occupied.

[0051] (3) High-quality flame-retardant PVC material is used as the insulating and waterproof layer. The vacuum packaging process has the advantages of strong sealing, no air bloating of the membrane, and long service life compared to the traditional rolling process. It can effectively isolate external moisture and salt from entering the interior of the floor heating membrane, thereby increasing the service life of the floor heating membrane.

[0052] (4) The graphene heating film-aerogel composite floor heating prepared by the present invention has the characteristics of one-sided upward heat transfer, which effectively prevents the heat of the floor heating film from being lost downward, and effectively solves the shortcomings of the existing external polystyrene insulation board such as occupying floor height, being resistant to temperature differences, and being easy to deform.

[0053] Current technologies and processes suffer from problems such as a lack of a built-in thermal insulation reflective layer and a less refined packaging process. This invention combines an improved aerogel felt with a graphene heating film, eliminating the need for 2.5cm polystyrene insulation boards in traditional installations. This makes installation easier and reduces indoor floor height. Using corrosion-resistant PVC as the packaging material and employing a vacuum packaging process, compared to traditional materials like PE and roller-pressed packaging, effectively reduces the power variation rate of the floor heating film and increases its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0055] Figure 1This is a schematic diagram of the structure of the graphene floor heating film of this invention. DETAILED DESCRIPTION

[0056] The present invention will be further described in detail below through specific implementation. It should be noted that the following embodiments are limited to the present invention, but are not intended to limit the scope of implementation of the present invention.

[0057] Example 1: A method for preparing a graphene heating film-aerogel composite floor heating system, comprising the following steps:

[0058] 1) Use conventional PET insulation substrate (length about 550mm, width about 520mm) as the insulation bottom layer;

[0059] The graphene heating carbon paste (prepared according to Example 5 of application number 202111448570.3) was screen-printed on the insulating base layer with a printing thickness of 0.1 mm, a printing length of 520 mm, and a width of 500 mm. After printing, the paste was dried at a temperature of 100°C for 10 minutes, thereby forming a graphene heating carbon paste layer with a thickness of about 0.03 mm. That is, the edge of the graphene heating carbon paste layer was kept at a distance of 10 to 15 mm from the corresponding edge of the insulating base layer, and the center point of the graphene heating carbon paste layer coincided with the center point of the insulating base layer.

[0060] A conductive silver paste electrode is screen-printed at each end of the graphene heating carbon paste layer (relative to the ends of the two long sides). The conductive silver paste electrode is connected to the graphene heating carbon paste layer. The silver paste electrode is 540mm long and 10mm wide (10mm longer than each side of the graphene heating carbon paste layer).

[0061] An EVA hot melt adhesive insulating layer (with a thickness of 0.2 mm, the same length and width as the insulating bottom layer, so that both sides are 15 mm longer and 10 mm wider than the graphene heating carbon paste layer) is tightly adhered to the graphene heating carbon paste layer and the conductive silver paste electrode by hot rolling, thereby forming an insulating layer that protects the graphene heating carbon paste and the conductive silver paste electrodes, that is, all the conductive silver paste electrodes and all the graphene heating carbon paste layers are covered by the hot melt adhesive insulating layer.

[0062] The melting temperature of EVA hot melt adhesive is 90℃ and the hot rolling temperature is 100℃.

[0063] Note: The melting temperature of the EVA hot melt adhesive insulation layer is 90°C. The higher melting temperature of the hot melt adhesive film is chosen to take into account the safety of the heating film during long-term use. The maximum temperature of the heating film for long-term underground use is around 85°C. Using a 90°C hot melt adhesive film can prevent the hidden dangers at this extreme temperature. The 100°C hot roller allows the hot melt adhesive to melt faster without damaging the PET layer, thereby increasing production efficiency.

[0064] In summary, the insulating bottom layer, the graphene heating carbon paste layer, and the hot melt adhesive insulating surface layer are combined to form the graphene heating layer 1. The thickness of the entire graphene heating layer 1 is ≤1 mm.

[0065] 2) A single-sided self-adhesive aluminum foil (the thickness of the aluminum foil is 0.5 mm) is tightly attached to the hot melt adhesive insulating surface of the graphene heating layer 1 by rolling; the coverage area is 80% of the hot melt adhesive insulating surface, thereby forming a leakage current recovery layer 2.

[0066] 3) The aerogel reflective insulation layer 3 is an aerogel felt with aluminum foil on one side;

[0067] The thickness of the aluminum foil is 0.5 mm, and the thickness of the aerogel felt is 4.5 mm.

[0068] The preparation method of aerogel thin felt with aluminum foil on one side comprises the following steps:

[0069] ①. Preparation process of aerogel felt:

[0070] Cut a piece of glass fiber non-woven fabric (4.5 mm thick) of the same size as the insulating base layer, immerse it in a 5-10% polyvinyl alcohol (PVA) aqueous solution for 5 seconds, take it out and place it in a 100°C oven to dry to constant weight to obtain a glass fiber non-woven fabric with PVA glue;

[0071] Next, silica sol was prepared by the sol-gel method, and the glass fiber non-woven fabric with PVA glue was immersed in the silica sol for 5s. After being taken out, it was aged in an oven at 30-40°C for 1 day, and then the solvent was replaced with ethanol in an oven at 50°C for 1 day. Then, the non-woven fabric was dried by CO2 supercritical drying (45°C, 20MPa) for 6h to obtain aerogel non-woven fabric (aerogel felt).

[0072] The silica sol is a dispersion of nano-sized silica particles in water with a mass concentration of 6%;

[0073] ② In order to better combine the non-woven fabric with PVA glue with the aerogel and achieve the purpose of uniform aerogel compounding without powder loss, a single-sided self-adhesive aluminum foil (thickness 0.5mm) of the same area was tightly attached to one side of the aerogel non-woven fabric using a rolling process to obtain an aerogel felt with a single-sided aluminum foil covering.

[0074] Finally, through the self-adhesive lamination process, the aluminum foil on the aerogel felt is tightly adhered to the insulating bottom layer of the graphene heating film layer 1; serving as the aerogel reflective insulation layer 3.

[0075] In summary, the leakage current recovery layer 2, the graphene heating film layer 1 and the aerogel reflective insulation layer 3 form the composite floor heating body.

[0076] 4) Use a hole-opening mold to open a 5mm*5mm small hole on the hot melt adhesive insulation surface corresponding to the silver paste electrodes on both sides. After connecting the lead wires, seal the holes with insulating putty.

[0077] Based on the length and width of the composite floor heating body, corrosion-resistant PVC is selected as the material for the waterproof insulation protective envelope 4. The corresponding insulation envelope is cut out using a high-frequency hot press; that is, the inner cavity of the waterproof insulation protective envelope 4 matches the composite floor heating body. The graphene floor heating film (composite floor heating body) with a laminated aerogel reflective insulation layer is placed into the envelope, and the ends are sealed with a high-frequency hot press, leaving a vacuum gap. A vacuum pump is used to extract the air from the envelope (the vacuum degree is less than 133 Pa), and finally the vacuum port is sealed with a high-frequency hot press, ultimately producing the graphene heating film-aerogel composite floor heating.

[0078] Example 2: A method for preparing a graphene heating film-aerogel composite floor heating system, comprising the following steps:

[0079] 1) With respect to step 1) of the embodiment, the following changes are made:

[0080] The printing mode of the graphene heating carbon paste in step 1) of Example 1 was changed from screen printing to gravure printing, and the printing thickness remained unchanged;

[0081] Change the "EVA hot melt adhesive insulation layer" to "TPU hot melt adhesive insulation layer", and keep the thickness unchanged at 0.2mm;

[0082] The melting temperature of TPU hot melt adhesive is 70℃, and the hot rolling temperature is 80℃;

[0083] The rest are the same as the steps in Example 1), thereby preparing the corresponding graphene heating layer 1.

[0084] Step 2) to step 4) are equivalent to Example 1.

[0085] Example 3: A method for preparing a graphene heating film-aerogel composite floor heating system, comprising the following steps:

[0086] The following changes are made relative to step 1) of the embodiment:

[0087] The printing mode of the graphene heating carbon paste in step 1) of Example 1 was changed from screen printing to gravure printing, and the printing thickness remained unchanged;

[0088] Change the "EVA hot melt adhesive insulation layer" to "TPU hot melt adhesive insulation layer", and the thickness remains unchanged at 0.2mm. The melting temperature of TPU hot melt adhesive is 70℃, and the hot rolling temperature is 80℃.

[0089] With respect to step 4) of the embodiment, the following changes are made:

[0090] Change the material of the waterproof insulating protective cover 4 from "corrosion-resistant PVC" to "butyl rubber";

[0091] The rest of the steps are the same as those in Example 1.

[0092] The rest is the same as Example 1.

[0093] Comparative Example 1:

[0094] Compared to Example 1, the aerogel reflective insulation layer 3 is removed, the waterproof insulation protective envelope 4 is made of conventional PE (polyethylene), and the packaging process is changed to a conventional roller pressing process, using mechanical rollers to expel air before hot pressing. Other processes refer to Example 1.

[0095] Comparative Example 2:

[0096] Compared with Example 1, the aerogel reflective insulation layer 3 is removed, and the material of the waterproof insulation protection envelope 4 is changed to traditional PE material. Other processes refer to Example 1.

[0097] Comparative Example 3:

[0098] Compared with Example 1: the aerogel reflective insulation layer 3 is removed, and other processes refer to Example 1.

[0099] Comparative Example 4:

[0100] Compared with Example 1, the aerogel reflective insulation layer 3 was removed, and other processes were the same as those in Example 1. During the paving test, a 2.5 cm thick polystyrene insulation board was laid underneath.

[0101] Comparative Example 5: The step of "immersing in a 5-10% polyvinyl alcohol (PVA) aqueous solution for 5 seconds" in step 3) of Example 1 was eliminated. That is, the glass fiber non-woven fabric was directly immersed in the silica sol for 5 seconds. The rest was the same as Example 1.

[0102] Comparative Example 6: The step 3) in Example 1, "after taking out, aging in an oven at 30-40°C for 1 day", was cancelled, and the ethanol replacement time was changed accordingly, that is, changed to "after taking out, solvent replacement with ethanol in an oven at 50°C for 2 days"; the rest was the same as in Example 1.

[0103] According to the test method described in the low-temperature radiant heating film industry standard JG / T286-2010, the above examples and comparative examples were subjected to a 14-day aging performance test. The test results are shown in Table 1 below:

[0104] Table 1

[0105] Aging test power change rate Example 1 2.8％ Example 2 3.7％ Example 3 4.8％ Comparative Example 1 7.3％ Comparative Example 2 4.8％ Comparative Example 3 2.8％ Comparative Example 4 2.8％ Comparative Example 5 2.8％ Comparative Example 6 2.8％

[0106] Aging test power change rate = (resistance after test - resistance before test) / resistance before test * 100%.

[0107] The above examples and comparative examples were energized and laid flat on a cement floor. Temperature probes were installed on the upper and lower surfaces of the floor heating membrane where they contact the ground. The heat conducted upward and to the ground by the floor heating membrane was tested. Under the same test conditions, the results obtained after energizing at room temperature of 20°C for 1 hour are shown in Table 2:

[0108] Table 2

[0109]

[0110] From the above test results, it can be seen that the present invention can effectively prevent the loss of heat by conduction downward, achieving the effect of one-way heat transfer. During the laying process of the graphene floor heating film prepared in the comparative example, a polystyrene insulation board with a thickness of about 2.5 cm needs to be laid as an insulation layer to achieve a similar effect. The thickness of the aerogel reflective insulation layer in the present invention is only 5 mm, and it is integrated with the floor heating film, which makes installation more convenient and can save indoor floor height. Using corrosion-resistant PVC as the packaging material and adopting a vacuum packaging process compared with traditional PE and other materials and roller packaging processes can effectively reduce the power change rate of the floor heating film and increase its service life.

[0111] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples and is subject to numerous variations. All variations that can be directly derived or conceived by a person of ordinary skill in the art from the disclosure of the present invention are considered to be within the scope of protection of the present invention.

Claims

1. Graphene heating film-aerogel composite floor heating, characterized by: The composite floor heating body comprises a leakage current recovery layer (2), a graphene heating film layer (1) and an aerogel reflective insulation layer (3) which are stacked in sequence from top to bottom, and the composite floor heating body is vacuum-enclosed in a waterproof insulating protective envelope (4); The preparation method of the graphene heating film-aerogel composite floor heating comprises the following steps: 1) Preparation of graphene heating film layer (1): Printing the graphene heating carbon paste on the insulating bottom layer by screen printing to form a graphene heating carbon paste layer, wherein the edge of the graphene heating carbon paste layer is kept at a distance of 10 to 15 mm from the corresponding edge of the insulating bottom layer; A silver paste electrode connected to the graphene heating carbon paste layer is provided on each side of the graphene heating carbon paste layer; and then a hot melt adhesive insulating surface layer that can completely cover the graphene heating carbon paste layer and the silver paste electrode is provided, thereby forming a graphene heating film layer (1); The thickness of the graphene heating carbon paste layer is 0.03±0.01mm; The size of the hot melt adhesive insulation surface layer is equal to the size of the insulation bottom layer; The insulating material used to prepare the insulating bottom layer is any one of the following: polyethylene terephthalate PET, polyimide PI, and biaxially oriented polyester BOPET; The hot melt adhesive used to prepare the hot melt adhesive insulation surface layer is: vinyl acetate copolymer EVA hot melt adhesive; 2) Set up leakage current recovery layer (2): The leakage current recovery layer (2) is tightly attached to the hot melt adhesive insulating surface of the graphene heating film layer (1), and the area of ​​the leakage current recovery layer (2) is 80±5% of the hot melt adhesive insulating surface; The thickness of the leakage current recovery layer (2) is 0.5±0.05 mm; 3) Lamination of the aerogel reflective insulation layer (3): The aerogel reflective insulation layer (3) is an aerogel felt with aluminum foil on one side; the aluminum foil of the aerogel reflective insulation layer (3) is tightly attached to the insulating bottom layer of the graphene heating film layer (1); thereby, the leakage current recovery layer (2), the graphene heating film layer (1) and the aerogel reflective insulation layer (3) are combined to form a composite floor heating body; The thickness of the aerogel reflective insulation layer (3) is 5±0.05 mm; The size of the aerogel reflective insulation layer (3) is the same as the insulating bottom layer of the graphene heating film layer (1); The preparation method of the aerogel felt with aluminum foil coated on one side comprises the following steps: ①. Preparation of aerogel felt: Cut a piece of glass fiber non-woven fabric of the same size as the insulation base, immerse it in a 5-10% polyvinyl alcohol aqueous solution for 5±1 s, take it out and dry it in a 100±10℃ oven to obtain a glass fiber non-woven fabric with PVA glue; Then, silica sol was prepared by sol-gel method: glass fiber non-woven fabric with PVA glue was immersed in silica sol for 5±1s, taken out and placed in silica sol for 30~40 o C for 1 day, then ethanol was added at 50±5 o C was subjected to solvent replacement for 1 day, followed by CO2 supercritical drying for 6±1h to obtain an aerogel felt; The silica sol is a dispersion of nano-sized silica particles in water with a mass concentration of 6±1%; ②, placing aluminum foil of the same area on either side of the aerogel felt to obtain an aerogel felt with aluminum foil on one side; 4) Vacuum packaging of waterproof insulation protective layer: The composite floor heating body prepared in step 3) is placed in a waterproof insulating protective envelope (4), and then vacuumed to obtain a graphene heating film-aerogel composite floor heating.

2. The graphene heating film-aerogel composite floor heating according to claim 1 is characterized in that In the step 1): The graphene heating carbon paste is printed on the insulating base layer by screen printing, and a silver paste electrode is printed on both ends of the formed graphene heating carbon paste layer by screen printing. Then, a hot melt adhesive insulating surface layer is sealed on the graphene heating carbon paste layer by hot rolling.

3. The graphene heating film-aerogel composite floor heating according to claim 1 or 2, characterized in that In the step 2), the leakage current recovery layer (2) is a single-sided adhesive-coated aluminum foil with a thickness of 0.5±0.05 mm. The aluminum foil is tightly adhered to the hot melt adhesive insulating surface of the graphene heating film layer (1) by rolling, and the area of ​​the aluminum foil is 80±5% of the area of ​​the hot melt adhesive insulating surface.

4. The graphene heating film-aerogel composite floor heating according to claim 3 is characterized in that In the step 4): Using a vacuum pump to extract the air from the waterproof insulating protective envelope (4), and using a high-frequency heat press to seal the vacuum port; The waterproof insulating protective envelope (4) is made of a waterproof insulating protective layer with a thickness of 0.8±0.08 mm.

5. The graphene heating film-aerogel composite floor heating according to claim 4, characterized in that: The material of the waterproof insulating protective layer is polyvinyl chloride (PVC) or butyl rubber.

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