Table board and graphene heating sheet

Abstract

The present invention discloses a table top, which includes a table top, a graphene heating sheet, a reflective layer and a table bottom plate, wherein the graphene heating sheet is arranged on the bottom surface of the table top, the reflective layer is arranged on the bottom surface of the graphene heating sheet, and the table bottom plate is arranged on the bottom surface of the reflective layer. The graphene heating sheet includes a substrate and a graphene heating film coated on one or both surfaces of the substrate, wherein the substrate includes an aramid fiber layer, a PET film or a PI film. The graphene heating sheet is bendable, has a long service life, low cost and fast heating speed; the table top is suitable for the table tops of dining tables, office desks and study tables, and has a heating function while playing the basic functions, and has a wide range of applications.

Description

Technical Field

[0001] The invention belongs to the technical field of graphene, and in particular relates to a table top and a graphene heating sheet thereof. Background Art

[0002] When cooked food is placed on the table, its temperature will gradually drop, especially in winter when the room temperature is low. The temperature of the food drops particularly quickly, and the food often gets cold before it is eaten. In the prior art, there are heating devices (such as induction cookers) that use electromagnetic principles to keep food warm. However, the electromagnetic heating devices are complex in structure, large in size and weight, and have special requirements for the containers for holding food (flat-bottomed metal containers). They are not suitable for heating ceramic bowls and dishes commonly used in Chinese families, and have great limitations when used. Therefore, it is necessary to develop a heating device with a simple, lightweight structure and wide applicability to keep food on the table warm.

[0003] In areas without heating and with low temperatures in winter, office work and study will be greatly affected, so it is extremely necessary to provide a heated office desk or study table. Summary of the invention

[0004] The object of the present invention is to provide a graphene heating sheet, which is bendable, has a long service life, low cost and fast heating speed.

[0005] Another object of the present invention is to provide a table top, including a graphene heating sheet, which is bendable, has a long service life, low cost and fast heating speed. The table top is suitable for tabletops such as dining tables, office desks and study tables. It not only performs basic functions but also has a heating function and has a wide range of applications.

[0006] To achieve the above-mentioned purpose, the present invention provides a graphene heating sheet, which includes a substrate and a graphene heating film coated on one or both sides of the substrate, wherein the substrate includes an aramid fiber layer, a PET film or a PI film. Preferably, the substrate is an aramid fiber layer, and the PET film is widely used in the field of traditional heating films, but both the PET film and the PI film have defects such as easy aging, easy falling off, not resistant to folding, and short service life, while the aramid fiber layer is more tightly bonded to the graphene heating film, not easy to age and fall off, and the aramid fiber layer is resistant to folding and has a longer service life. Specifically, the aramid fiber layer can be folded into a roll film shape and can be cut into any size or shape. In addition, the graphene heating sheet of the present invention also has the following advantages: light weight, can be compounded with other materials; hydrophobic, stampable, acid and alkali resistant; high efficiency and energy saving, fast heating, under a certain power density, can heat up in seconds, that is, 1s can rise to several hundred degrees, such as 300°C.

[0007] Furthermore, the substrate and the graphene heating film thereon constitute a heating unit, the graphene heating sheet also includes an upper insulating layer and a lower insulating layer, and at least one heating unit is arranged between the upper insulating layer and the lower insulating layer.

[0008] Furthermore, a copper conductor is connected to the graphene heating film, the copper conductor is a printed copper layer, the copper conductor is electrically connected to a power line, and the power line and the copper conductor are used to supply power to the graphene heating film for heating.

[0009] Furthermore, the graphene heating film includes a tubular carbon material and a sheet graphene material, and the tubular carbon material and the sheet graphene material are evenly distributed. The evenly distributed sheet graphene material realizes rapid electrical connection at least in the horizontal direction, and the tubular carbon material is evenly distributed between the sheet graphene materials, and at least connects each layer of sheet graphene material in the thickness direction, so that the three-dimensional direction, that is, each position of the graphene heating film can instantly conduct electrical energy, and the heat is uniform; furthermore, when powered on, the graphene heating film can immediately excite the resonance effect between carbon atoms, generate phonon oscillations and immediately release far infrared rays, and the electrical energy is instantly converted into thermal energy. The heated material can achieve rapid temperature rise under the action of atomic resonance and far infrared; in addition, the tubular carbon material is cheaper than the sheet graphene material, and the graphene heating film mixed with the tubular carbon material has a lower cost and a faster heating speed.

[0010] Furthermore, the mass ratio of the tubular carbon material to the flaky graphene material is (1-5):(1-5), the length of the tubular carbon material is 100-200 um, and the D of the tubular carbon material is 50 The thickness of the graphene material is 10-30 um, and the graphene material is a single-layer graphene.

[0011] Furthermore, the graphene heating film also contains a dispersant and an adhesive, the dispersant is CMC, and the adhesive is SBR.

[0012] The present invention also provides a table top, which includes a desktop top, a graphene heating sheet, a reflective layer and a table bottom plate, wherein the graphene heating sheet is arranged on the bottom surface of the desktop top, the reflective layer is arranged on the bottom surface of the graphene heating sheet, and the table bottom plate is arranged on the bottom surface of the reflective layer.

[0013] Furthermore, the table top also includes a table side panel, which fixes the table top panel and the table bottom panel from the side, thereby fixing the graphene heating sheet and the reflective layer therebetween.

[0014] Furthermore, the desktop panel has a three-layer structure, including an upper heat-conducting layer, a lower heat-conducting layer and a honeycomb layer sandwiched between the upper heat-conducting layer and the lower heat-conducting layer, and the desktop panel is made of heat-conducting material.

[0015] Furthermore, the reflective layer is aluminum foil, aluminum-plated steel plate or floor heating reflective film; the table bottom plate is wood board, polyurethane foam, polystyrene board, phenolic foam, aerogel felt, glass wool, rock wool, expanded perlite, micro-nano insulation or foamed cement.

[0016] Beneficial effects of the present invention: The present invention provides a graphene heating sheet, which is bendable, has a long service life, low cost and fast heating speed; the table top is suitable for tabletops of dining tables, office desks, study tables, etc., and can also be directly placed on other tabletops that need to be heated. It has a heating function while playing a basic function, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional view of the table top of the present invention.

[0018] Figure 2 It is a schematic cross-sectional view of the graphene heating sheet of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the graphene heating sheet of the present invention.

[0020] Among them, 1-graphene heating sheet; 2-reflective layer; 3-desk bottom plate; 4-desk top plate; 41-upper thermal conductive layer; 42-honeycomb layer; 43-lower thermal conductive layer; 5-desk side plate; 10-graphene heating film; 20-aramid fiber layer; 30-copper conductor; 40-lower insulating layer; 50-upper insulating layer; 60-power cord. DETAILED DESCRIPTION

[0021] The "range" disclosed herein is in the form of a lower limit and an upper limit. It can be one or more lower limits, and one or more upper limits, respectively. A given range is defined by selecting a lower limit and an upper limit. The selected lower limit and upper limit define the boundaries of a particular range. All ranges that can be defined in this way are inclusive and combinable, i.e., any lower limit can be combined with any upper limit to form a range. For example, a range of 60-120 and 80-110 is listed for a specific parameter, and it is understood that a range of 60-110 and 80-120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present invention, if there is no special explanation, all embodiments and preferred embodiments mentioned herein can be combined with each other to form a new technical solution.

[0022] In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution. In the present invention, unless otherwise specified, all steps mentioned herein can be performed sequentially or randomly, but preferably sequentially.

[0023] Embodiment 1:

[0024] Preparation of graphene heating sheet 1:

[0025] The binder SBR and the dispersant CMC are added to the solvent, stirred, and after being evenly dispersed, the tubular carbon material and the flake graphene material are added, and the mass ratio of the tubular carbon material to the flake graphene material is 1:5, and stirred to obtain a graphene slurry; wherein the length of the tubular carbon material is 100 to 200 um, and the D of the tubular carbon material is 50 The graphene material is a single-layer graphene; the weight ratio of the binder: the dispersant: the tubular carbon material and the flake graphene material is 3:1:100; the graphene slurry is coated on both sides of an aramid fiber layer 20 by coating, and the coating amount of each layer is 0.2ml / cm 2 ; Dry the solvent, and the graphene slurry forms a graphene heating film 10; Provide a copper conductor 30 and a power line 60, the copper conductor 30 is a printed copper layer, which is electrically connected to the graphene heating film 10 and the power line 60, and the power line 60 and the copper conductor 30 are used to supply electricity to the graphene heating film 10 for heating; and provide an upper insulating layer 50 and a lower insulating layer 40, the aramid fiber layer 20 and the graphene heating film 10 thereon constitute a heating unit, and at least one heating unit is arranged between the upper insulating layer 50 and the lower insulating layer 40 at intervals, thereby obtaining a graphene heating sheet 1. Of course, in other embodiments, the heating unit can also be one, which is laid flat between the upper insulating layer 50 and the lower insulating layer 40 as a whole.

[0026] The structure of the table is described in detail below:

[0027] The table top includes a table top panel 4, a graphene heating sheet 1, a reflective layer 2, a table bottom panel 3 and a table side panel 5. The graphene heating sheet 1 is arranged on the bottom surface of the table top panel 4, the reflective layer 2 is arranged on the bottom surface of the graphene heating sheet 1, and the table bottom panel 3 is arranged on the bottom surface of the reflective layer 2.

[0028] The desktop panel 4 is a three-layer structure, including an upper heat-conducting layer 41, a lower heat-conducting layer 43, and a honeycomb layer 42 sandwiched between the upper heat-conducting layer 41 and the lower heat-conducting layer 43. The desktop panel 4 is made of heat-conducting materials, such as aluminum alloy, steel plate and other heat-conducting materials. The height of the honeycomb layer 42 can be adjusted as needed. The honeycomb layer 42 of the desktop panel 4 is also made of heat-conducting materials, which can quickly conduct heat from the lower heat-conducting layer 43 to the upper heat-conducting layer 41. The honeycomb layer 42 has a honeycomb structure, which has a good heat buffer effect and can keep warm for a long time. The desktop panel 4 can be directly used as the desktop of a dining table, an office desk, a study table, etc., can also be embedded in the desktop of a dining table, an office desk, a study table, etc., and can also be placed on the desktop of a dining table, an office desk, a study table, etc.

[0029] The reflective layer 2 is an aluminum foil, an aluminum-plated steel plate or a floor heating reflective film. The table bottom plate 3 is a wooden board, a polyurethane foam, a polystyrene board, a phenolic foam, an aerogel felt, a glass wool, a rock wool, an expanded perlite, a micro-nano thermal insulation or a foamed cement. The table side plate 5 fixes the table top plate 4 and the table bottom plate 3 from the side, thereby fixing the graphene heating sheet 1 and the reflective layer 2 therebetween. In this embodiment, the table side plate 5 is a separate component, which is installed on the four sides of the table top. Specifically, the cross-section of the table side plate 5 is U-shaped, having an upper flange and a lower flange, and the edges of the table top plate 4 and the table bottom plate 3 are engaged between the upper flange and the lower flange. Specifically, the lower surface of the upper flange is engaged with the upper surface of the edge of the table top plate 4, and the upper surface of the lower flange is engaged with the lower surface of the edge of the table bottom plate 3. More preferably, the engaged table side panels 5 are fixed to the table top panel 4 and / or the table bottom panel 3, such as by screws, glue, etc., which are not limited here. Any solution that can achieve the fixing of the table side panels 5 is applicable to the present invention. Of course, in other embodiments, the table side panels 5 can also be a plate without upper flanges and lower flanges, which are not limited here as long as the table top panel 4 and the table bottom panel 3 can be fixed.

[0030] Example 2

[0031] The graphene heating sheet 1 and the table top were prepared according to Example 1, with the only difference being that the mass ratio of the tubular carbon material to the flake graphene material was 2:3; the weight ratio of the binder: dispersant: tubular carbon material to the flake graphene material was 5:3:100; and the coating amount of each layer of the graphene slurry was 1 ml / cm 2 .

[0032] Example 3

[0033] The graphene heating sheet 1 and the table top were prepared according to Example 1, with the only difference being that the mass ratio of the tubular carbon material to the flake graphene material was 5:1; the weight ratio of the binder: dispersant: tubular carbon material to the flake graphene material was 4:2:100; and the coating amount of each layer of the graphene slurry was 0.4 ml / cm 2 .

[0034] Example 4

[0035] The graphene heating sheet 1 and the table top were prepared according to Example 1, with the only difference being that the mass ratio of the tubular carbon material to the flake graphene material was 3:2; the weight ratio of the binder: dispersant: tubular carbon material to the flake graphene material was 3:3:100; and the coating amount of each layer of the graphene slurry was 0.7 ml / cm 2 .

[0036] Comparative Example 1

[0037] The graphene heating sheet 1 and the table top are prepared according to Example 1, with the only difference being that only flaky graphene material is added, and no tubular carbon material is added.

[0038] Comparative Example 2

[0039] The graphene heating sheet 1 and the table top are prepared according to Example 1, with the only difference being that only tubular carbon material is added, and no flaky graphene material is added.

[0040] Comparative Example 3

[0041] The graphene heating sheet 1 and the table top are prepared according to Example 1, with the only difference being that the graphene heating sheet 1 uses a commercially available Xiaoyang brand PTC-H graphene electric heating film.

[0042] The dimensions of the graphene heating sheet 1 of each embodiment 1 to 4 and comparative examples 1 to 3 are all set as: width 600 mm, length 1600 mm. The far infrared emissivity, infrared emission wavelength and electrothermal conversion efficiency of each graphene heating sheet 1 are measured under the conditions of working voltage 0 to 1000 V and working temperature <400° C. The results are as follows.

[0043] project Far infrared emissivity Infrared emission wavelength Electric heat conversion efficiency Example 1 99.8％ 2~20um >99.90％ Example 2 99.7％ 2~20um >99.90％ Example 3 99.9％ 2~20um >99.90％ Example 4 99.8％ 2~20um >99.90％ Comparative Example 1 97.7％ 5~300um 96.1％ Comparative Example 2 97.1％ 5~300um 95.7％ Comparative Example 3 96.2％ 10~400um 95.2％

[0044] As can be seen from the above, the graphene heating sheet 1 of the present invention has very excellent far-infrared emission performance. When the infrared emission wavelength is 2 to 20 um, the electrothermal conversion efficiency reaches more than 99.90%. The far-infrared wavelength of 2 to 20 um has become a safe, effective and widely used physiotherapy band. Among them, the infrared emission wavelength of 4 to 14 um can heat objects most effectively.

[0045] When the graphene heating sheet 1 of the present invention is powered on, a resonance effect is generated between the carbon atoms of the tubular carbon material. The wavelength of this oscillation is an electromagnetic wave of 2 to 20 um, that is, phonon oscillation generates thermal energy, thereby converting electrical energy into thermal energy. Since the tubular carbon material has high crystallinity and few defects, phonon scattering can be prevented. Phonon energy is transmitted in the form of far-infrared, and there is no internal phonon scattering and energy loss. Therefore, the electrothermal conversion efficiency is high, and external objects can be heated quickly.

[0046] The graphene heating film 10 of the present invention includes a tubular carbon material and a flaky graphene material, and the tubular carbon material and the flaky graphene material are evenly distributed. The evenly distributed flaky graphene material realizes rapid electrical connection at least in the horizontal direction, and the tubular carbon material is evenly distributed between the flaky graphene materials, and at least connects each layer of flaky graphene material in the thickness direction, so that the graphene heating film 10 can instantly conduct electrical energy in the three-dimensional direction, and heat evenly; furthermore, when powered on, the graphene heating film 10 can immediately excite the resonance effect between carbon atoms, generate phonon oscillations and immediately release far infrared rays, and the electrical energy is instantly converted into thermal energy. The heated material can achieve rapid temperature rise under the action of atomic resonance and far infrared; in addition, the tubular carbon material is cheaper than the flaky graphene material, and the graphene heating film 10 doped with the tubular carbon material has a lower cost and a faster heating speed.

[0047] The substrate of the present invention includes an aramid fiber layer, a PET film or a PI film. Preferably, the substrate is an aramid fiber layer. The PET film is widely used in the field of traditional heating films, but both the PET film and the PI film have defects such as easy aging, easy falling off, not folding-resistant, and short service life. The aramid fiber layer is more tightly bonded to the graphene heating film, not easy to age and fall off, and the aramid fiber layer is folding-resistant and has a longer service life. Specifically, the aramid fiber layer can be folded into a roll film and can be cut into any size or shape. In addition, the graphene heating sheet 1 of the present invention also has the following advantages: light weight, can be composited with other materials; hydrophobic, stampable, acid and alkali resistant; high efficiency and energy saving, fast heating, under a certain power density, it can heat up in seconds, that is, it can rise to several hundred degrees in 1 second, such as 300°C. The graphene heating sheet 1 is arranged in the table top without increasing the thickness of the table top and affecting the appearance of the table top. In addition, the table top is suitable for table tops such as dining tables, office desks and study tables, and can also be directly placed on other table tops that need to be heated. It has a heating function while fulfilling the basic functions and has a wide range of applications.

[0048] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A graphene heating sheet, characterized in that: The graphene heating sheet includes a substrate and a graphene heating film coated on one or both sides of the substrate, the substrate includes an aramid fiber layer, a PET film or a PI film, the graphene heating film includes a tubular carbon material and a flaky graphene material, the tubular carbon material and the flaky graphene material are evenly distributed, the evenly distributed flaky graphene material can achieve rapid electrical connection at least in the horizontal direction, the tubular carbon material is evenly distributed between the flaky graphene materials, and each layer of the flaky graphene material is connected at least in the thickness direction, so that electrical energy can be instantly conducted in the three-dimensional direction, i.e., each position of the graphene heating film, and the heat can be evenly generated.

2. The graphene heating sheet according to claim 1, characterized in that: The substrate and the graphene heating film thereon form a heating unit, and the graphene heating sheet further comprises an upper insulating layer and a lower insulating layer, and at least one heating unit is arranged between the upper insulating layer and the lower insulating layer.

3. The graphene heating sheet according to claim 1, characterized in that: A copper conductor is connected to the graphene heating film, the copper conductor is a printed copper layer, and the copper conductor is electrically connected to a power line, and the power line and the copper conductor are used to supply power to the graphene heating film to generate heat.

4. The graphene heating sheet according to claim 1, characterized in that: The mass ratio of the tubular carbon material to the flaky graphene material is (1-5):(1-5), the length of the tubular carbon material is 100-200 um, and the D of the tubular carbon material is 50 The thickness of the graphene material is 10-30 um, and the graphene material is a single-layer graphene.

5. The graphene heating sheet according to claim 1, characterized in that: The graphene heating film also contains a dispersant and an adhesive, wherein the dispersant is CMC and the adhesive is SBR.

6. A table top, characterized in that: The table top comprises: A desktop panel; The graphene heating sheet according to any one of claims 1 to 5, wherein the graphene heating sheet is arranged on the bottom surface of the desktop panel; a reflective layer, the reflective layer being disposed on the bottom surface of the graphene heating sheet; and A table bottom plate is arranged on the bottom surface of the reflective layer.

7. The table top according to claim 6, characterized in that: The table top also includes a table side plate, which fixes the table top plate and the table bottom plate from the side, thereby fixing the graphene heating sheet and the reflective layer therebetween.

8. The table top according to claim 6, characterized in that: The desktop panel has a three-layer structure, including an upper heat-conducting layer, a lower heat-conducting layer and a honeycomb layer sandwiched between the upper heat-conducting layer and the lower heat-conducting layer. The desktop panel is made of heat-conducting material.

9. The table top according to claim 6, characterized in that: The reflective layer is aluminum foil, aluminum-plated steel plate or floor heating reflective film; the table bottom plate is wood board, polyurethane foam, polystyrene board, phenolic foam, aerogel felt, glass wool, rock wool, expanded perlite, micro-nano thermal insulation or foamed cement.

Images