WO2022007433A1 - Graphite sheet for far-infrared heating and preparation method therefor - Google Patents
Graphite sheet for far-infrared heating and preparation method therefor Download PDFInfo
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- WO2022007433A1 WO2022007433A1 PCT/CN2021/082327 CN2021082327W WO2022007433A1 WO 2022007433 A1 WO2022007433 A1 WO 2022007433A1 CN 2021082327 W CN2021082327 W CN 2021082327W WO 2022007433 A1 WO2022007433 A1 WO 2022007433A1
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- graphite sheet
- graphite
- far
- infrared heating
- substrate
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 166
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 166
- 239000010439 graphite Substances 0.000 title claims abstract description 166
- 238000010438 heat treatment Methods 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 37
- 229920000307 polymer substrate Polymers 0.000 claims abstract description 17
- 238000005087 graphitization Methods 0.000 claims abstract description 13
- 238000003763 carbonization Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000003698 laser cutting Methods 0.000 claims description 2
- 238000005979 thermal decomposition reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/145—Carbon only, e.g. carbon black, graphite
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
Definitions
- the invention belongs to the technical field of graphite materials, and in particular relates to a preparation method of a graphite sheet for far-infrared heating and the prepared graphite sheet.
- the shape and size of the existing graphite sheet cannot be freely adjusted by designing the product structure, the size and shape of the prepared graphite sheet are relatively simple, and the graphite sheet product with the required resistance value cannot be quickly prepared.
- the traditional heating wire cannot reach a higher temperature during heating, and it is difficult to maintain a specified temperature, and the temperature adjustment range is narrow, and the conversion efficiency of electric energy into heat energy is low.
- the present invention aims to solve at least one of the technical problems existing in the prior art.
- the present invention proposes a preparation method of a far-infrared heating graphite sheet.
- the preparation method of the far-infrared heating graphite sheet is easy to operate, and can not only prepare a far-infrared heating graphite sheet with excellent thermal conductivity, but also can be designed
- the product structure can freely adjust the shape and size of the graphite flakes.
- the present invention also provides a graphite sheet for far-infrared heating, which has the advantages of excellent thermal conductivity, easy adjustment of shape and size, and the like.
- the method for preparing a graphite sheet for far-infrared heating includes the following steps: S1. Obtaining a polymer substrate capable of carbonization and graphitization, the polymer substrate having a first thickness S2, thermally decompose the polymer substrate to obtain a graphite substrate with a second thickness; S3, set a circuit unit on the graphite substrate, according to the thickness of the graphite substrate and Resistivity, calculate the resistance value R1 of the circuit unit; S4, calculate the number of circuit units that need to be set on the graphite substrate according to the resistance value R required by the graphite sheet; S5, on the graphite substrate A corresponding number of the circuit units are prepared on the above to obtain the graphite sheet.
- a graphite sheet with excellent thermal conductivity can be prepared, the thermal conductivity is as high as 1800W/mk, and the calorific value is high.
- the shape of the graphite sheet can be adjusted by designing the product structure. and size can be freely adjusted.
- step S2 includes: S21, obtaining the polymer base material, and performing carbonization treatment to obtain a carbonized base material; S22, performing a heating treatment on the carbonized base material to gradually reach the graphitization temperature; S23 2.
- select a temperature reference point take the temperature reference point as the reference temperature, and perform periodic oscillation within the variation range of the threshold range, wherein in the entire graphitization temperature range, the completed oscillation The cycle is more than three times.
- the first thickness is 20 ⁇ m-250 ⁇ m
- the second thickness is 50 ⁇ m-400 ⁇ m.
- the polymer substrate is polyimide.
- the graphite sheet includes: a plurality of first graphite sheet units, the plurality of first graphite sheet units are connected in series in sequence, and each of the first graphite sheet units includes: a transverse graphite sheet sheet, the transverse graphite sheet extends in the horizontal direction, the transverse graphite sheet includes a plurality of the circuit units connected in series along the horizontal direction, and each of the circuit units extends in the up-down direction; the vertical graphite sheet, the vertical graphite sheet The graphite sheet extends in the up-down direction, the upper or lower end of the vertical graphite sheet is connected in series with the horizontal graphite sheet, and the vertical graphite sheet includes a plurality of the circuit units connected in series along the up-down direction.
- the circuit unit extends in the horizontal direction.
- step S5 a die-cutting machine or laser cutting is performed on the graphite substrate to obtain the graphite sheet.
- the graphite sheet includes: a plurality of second graphite sheet units, the plurality of second graphite sheet units are connected in series in sequence, and each second graphite sheet unit includes: at least two There are two sub-limbs, the two sub-limbs are spaced apart in the up-down direction and are connected in parallel in the up-down direction, and at least one end of each sub-limb is connected in series with the adjacent second graphite sheet unit.
- the number of the limbs in each of the second graphite sheet units is two, and any one of the two limbs is formed such that the opening faces the other limb The concave piece set in the direction.
- the thermal conductivity of the circuit unit is 300W/mk-1800W/mk.
- the graphite sheet for far-infrared heating according to the embodiment of the second aspect of the present invention is prepared according to the preparation method described in any of the above embodiments.
- FIG. 1 is a flow chart of a method for preparing a graphite sheet for far-infrared heating according to an embodiment of the present invention
- FIG. 2 is a schematic structural diagram of a graphite sheet for far-infrared heating according to an embodiment of the present invention
- Fig. 3 is the enlarged schematic diagram of A area in Fig. 2;
- FIG. 4 is a schematic structural diagram of a circuit unit of a graphite sheet for far-infrared heating according to an embodiment of the present invention
- FIG. 5 is a schematic structural diagram of a graphite sheet for far-infrared heating according to another embodiment of the present invention.
- the first graphite sheet unit 10 the horizontal graphite sheet 11; the vertical graphite sheet 12; the circuit unit 13;
- the terms “installed”, “connected” and “connected” should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.
- installed should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.
- the method for preparing a graphite sheet for far-infrared heating includes the following steps: S1. Obtaining a polymer substrate capable of carbonization and graphitization, wherein the polymer substrate has a first thickness of the sheet; S2, thermally decompose the polymer substrate to obtain a graphite substrate with a second thickness; S3, set a circuit unit 13 on the graphite substrate, and calculate according to the thickness and resistivity of the graphite substrate The resistance value R1 of the circuit unit 13; S4, calculate the number of circuit units 13 that need to be set on the graphite substrate according to the resistance value R required by the graphite sheet; S5, prepare the corresponding number of circuit units on the graphite substrate 13. Graphite flakes are obtained.
- the method for preparing a graphite sheet for far-infrared heating mainly adopts the following steps: first, obtaining a polymer base material, which has a first thickness and is formed into a sheet-like material; The polymer substrate is sequentially carbonized and graphitized to obtain a graphite substrate with a second thickness; then, a circuit unit 13 is set on the graphite substrate, and the resistance value R1 of the circuit unit 13 is calculated, wherein the graphite substrate is The thicker the thickness of the graphite sheet, the smaller the resistance, the thinner the thickness, the greater the resistance; then, according to the required resistance value R of the graphite sheet, the circuit design is carried out on the graphite sheet, and the circuit unit 13 that needs to be set on the graphite substrate is calculated.
- the circuit design process is mainly designed according to the thickness, resistivity and product size of the graphite substrate; finally, a corresponding number of circuit units 13 are prepared on the graphite substrate to obtain a
- a graphite sheet with excellent thermal conductivity can be prepared, the thermal conductivity is as high as 1800W/mk, and the calorific value is high.
- the shape and size of the slices can be freely adjusted.
- step S2 includes: S21, obtaining a polymer substrate, and performing carbonization treatment to obtain a carbonized substrate; S22, performing a heating treatment on the carbonized substrate to gradually reach the graphitization temperature; S23, in graphite Within the range of the graphitization temperature, select the temperature reference point, take the temperature reference point as the reference temperature, and perform periodic oscillation within the variation range of the threshold range. A high thermal conductivity graphite film is obtained.
- the graphitization temperature is preferably 2300-3000° C.
- the temperature, the heating rate and the holding time are mainly adjusted by the heating curve, and the holding time is preferably 20min-200min.
- the first thickness is 20 ⁇ m-250 ⁇ m
- the second thickness is 50 ⁇ m-400 ⁇ m.
- the polymer substrate is polyimide
- the polyimide is a thermally conductive film
- the resistance R 1 of the unit 13 ⁇ *L/S 1 .
- step S4 it is assumed that the resistance value R required by the graphite sheet is 12 ⁇ , and in the case that the circuit units 13 are all connected in series, 363,637 circuit units 13 are required, and these circuit units 13 are arranged in a certain shape to adjust and distribute to realize circuitization. distributed.
- the graphite sheet includes a plurality of first graphite sheet units 10, and the plurality of first graphite sheet units 10 are connected in series in sequence, and each first graphite sheet
- the unit 10 includes: a transverse graphite sheet 11 and a vertical graphite sheet 12, the transverse graphite sheet 11 extends in the horizontal direction, and the transverse graphite sheet 11 includes a plurality of circuit units 13 connected in series along the horizontal direction, and each circuit unit 13 extends in the up-down direction , the vertical graphite sheet 12 extends in the up-down direction, the upper or lower end of the vertical graphite sheet 12 is connected in series with the horizontal graphite sheet 11, and the vertical graphite sheet 12 includes a plurality of circuit units 13 connected in series along the upper and lower directions, and each circuit unit 13 Extending in the horizontal direction, the shape and size of the graphite sheet can be freely adjusted by designing the product structure by using the horizontal graphite sheet 11
- step S5 a die-cutting machine is used to perform die-cutting on the graphite substrate to obtain a graphite sheet.
- a laser method can also be used to obtain a graphite sheet on a graphite substrate.
- the graphite sheet includes: a plurality of second graphite sheet units 20, the plurality of second graphite sheet units 20 are connected in series in sequence, and each second graphite sheet unit 20 Including: at least two sub-limbs 21, the two sub-limbs 21 are spaced apart along the up-down direction and parallel in the up-down direction, at least one end of each sub-limb 21 is connected in series with the adjacent second graphite sheet unit 20, this implementation
- a combination of series and parallel is used to achieve heat conduction.
- Connecting limbs may be provided between two adjacent second graphite sheet units 20, and the connecting limbs are adjacent to the split limbs 21 to realize series connection.
- the number of the limbs 21 in each second graphite sheet unit 20 is two, and any limb 21 of the two limbs 21 is formed with an opening facing the other limb 21 The concave piece set in the direction.
- the thermal conductivity of the circuit unit 13 is 300W/mk-1800W/mk.
- the far-infrared heating graphite sheet according to the embodiment of the present invention includes the preparation method of the far-infrared heating graphite sheet according to the above-mentioned embodiment. Since the preparation method of the far-infrared heating graphite sheet according to the embodiment of the present invention has the above technical effect, therefore , the graphite sheet for far-infrared heating according to the embodiment of the present invention also has corresponding technical effects, that is, it has the advantages of excellent thermal conductivity, large calorific value, and it is convenient to adjust the graphite sheet according to the structure of the product.
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- Organic Chemistry (AREA)
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Abstract
A graphite sheet for far-infrared heating and a preparation method therefor. The preparation method comprises the following steps: S1, obtaining a polymer substrate capable of being subjected to carbonization and graphitization treatment, the polymer substrate being flake-shaped and having a first thickness; S2, performing thermal decomposition on the polymer substrate to obtain a graphite substrate having a second thickness; S3, configuring a circuit unit (13) on the graphite substrate, and calculating a resistance value R1 of the circuit unit (13) according to the thickness and resistivity of the graphite substrate; S4, according to a resistance value R required for the graphite sheet, calculating the number of circuit units required to be configured on the graphite substrate; and S5, preparing the corresponding number of the circuit units (13) on the graphite substrate to obtain the graphite sheet. According to the preparation method for the graphite sheet for far-infrared heating, the graphite sheet used for far-infrared heating and having excellent heat-conducting property can be prepared.
Description
本发明属于石墨材料技术领域，具体涉及一种远红外加热用石墨片的制备方法以及制备得到的石墨片。The invention belongs to the technical field of graphite materials, and in particular relates to a preparation method of a graphite sheet for far-infrared heating and the prepared graphite sheet.
现有的石墨片通常不能够通过设计产品结构对其形状和尺寸进行自由调节，制备得到的石墨片的尺寸和形状较为单一，并且不能快速制备得到所需电阻值的石墨片产品。并且传统的发热丝在加热时不能够达到较高的温度，也难以维持指定温度，并且温度调节范围狭窄，对于电能转化为热能的转化效率低。The shape and size of the existing graphite sheet cannot be freely adjusted by designing the product structure, the size and shape of the prepared graphite sheet are relatively simple, and the graphite sheet product with the required resistance value cannot be quickly prepared. In addition, the traditional heating wire cannot reach a higher temperature during heating, and it is difficult to maintain a specified temperature, and the temperature adjustment range is narrow, and the conversion efficiency of electric energy into heat energy is low.
发明内容SUMMARY OF THE INVENTION
本发明旨在至少解决现有技术中存在的技术问题之一。The present invention aims to solve at least one of the technical problems existing in the prior art.
为此，本发明提出一种远红外加热用石墨片的制备方法，该远红外加热用石墨片的制备方法操作方便，不仅能够制备得到导热性能优异的远红外加热用石墨片，还能够通过设计产品结构对石墨片的形状和尺寸进行自由调节。To this end, the present invention proposes a preparation method of a far-infrared heating graphite sheet. The preparation method of the far-infrared heating graphite sheet is easy to operate, and can not only prepare a far-infrared heating graphite sheet with excellent thermal conductivity, but also can be designed The product structure can freely adjust the shape and size of the graphite flakes.
本发明还提出一种远红外加热用石墨片，该远红外加热用石墨片具有导热性能优异，形状和尺寸便于调节等优点。The present invention also provides a graphite sheet for far-infrared heating, which has the advantages of excellent thermal conductivity, easy adjustment of shape and size, and the like.
根据本发明第一方面实施例的远红外加热用石墨片的制备方法，包括以下步骤：S1、获取能够进行碳化和石墨化处理的高分子基材，所述高分子基材为具有第一厚度的片状；S2、对所述高分子基材进行热分解，得到第二厚度的石墨基材；S3、在所述石墨基材上设定一个电路单元，根据所述石墨基材的厚度和电阻率，计算所述电路单元的电阻值R1；S4、根据石墨片需要的电阻值R，计算需要在所述石墨基材上设定的电路单元的个数；S5、在所述石墨基材上制备对应个数的所述电路单元，得到所述石墨片。The method for preparing a graphite sheet for far-infrared heating according to the embodiment of the first aspect of the present invention includes the following steps: S1. Obtaining a polymer substrate capable of carbonization and graphitization, the polymer substrate having a first thickness S2, thermally decompose the polymer substrate to obtain a graphite substrate with a second thickness; S3, set a circuit unit on the graphite substrate, according to the thickness of the graphite substrate and Resistivity, calculate the resistance value R1 of the circuit unit; S4, calculate the number of circuit units that need to be set on the graphite substrate according to the resistance value R required by the graphite sheet; S5, on the graphite substrate A corresponding number of the circuit units are prepared on the above to obtain the graphite sheet.
根据本发明实施例的远红外加热用石墨片的制备方法能够制备得到具有优异的导热性能的石墨片，导热系数高达1800W/mk，发热量高，而且，可通过设计产品结构对石墨片的形状和尺寸进行自由调节。According to the method for preparing a graphite sheet for far-infrared heating according to the embodiment of the present invention, a graphite sheet with excellent thermal conductivity can be prepared, the thermal conductivity is as high as 1800W/mk, and the calorific value is high. Moreover, the shape of the graphite sheet can be adjusted by designing the product structure. and size can be freely adjusted.
根据本发明一个实施例，步骤S2包括：S21、获取所述高分子基材，进行碳化处理 得到碳化基材；S22、将所述碳化基材进行升温处理，使其逐步达到石墨化温度；S23、在石墨化温度范围内，选择温度参考点，以所述温度参考点为参照温度，在阈值范围的变化范围内进行周期性振荡，其中在整个所述石墨化温度范围内，所完成的振荡周期为三次以上。According to an embodiment of the present invention, step S2 includes: S21, obtaining the polymer base material, and performing carbonization treatment to obtain a carbonized base material; S22, performing a heating treatment on the carbonized base material to gradually reach the graphitization temperature; S23 2. In the graphitization temperature range, select a temperature reference point, take the temperature reference point as the reference temperature, and perform periodic oscillation within the variation range of the threshold range, wherein in the entire graphitization temperature range, the completed oscillation The cycle is more than three times.
根据本发明一个实施例，所述第一厚度为20μm-250μm，所述第二厚度为50μm-400μm。According to an embodiment of the present invention, the first thickness is 20 μm-250 μm, and the second thickness is 50 μm-400 μm.
根据本发明一个实施例，所述高分子基材为聚酰亚胺。According to an embodiment of the present invention, the polymer substrate is polyimide.
根据本发明一个实施例，步骤S3中，所述电路单元为矩形件，所述矩形件的长度为L，宽度为m
1，厚度为H，电阻率为ρ，截面积S1＝m
1*H，所述电路单元的电阻R
1＝ρ*L/S
1。
According to an embodiment of the present invention, in step S3, the circuit unit is a rectangular piece, the length of the rectangular piece is L, the width is m 1 , the thickness is H, the resistivity is ρ, and the cross-sectional area S1=m 1 *H , the resistance of the circuit unit R 1 =ρ*L/S 1 .
根据本发明一个实施例，步骤S4中，多个所述电路单元串联，需要在所述石墨基材上设定的电路单元的个数N＝R/R
1。
According to an embodiment of the present invention, in step S4, a plurality of the circuit units are connected in series, and the number of circuit units that need to be set on the graphite substrate is N=R/R 1 .
根据本发明一个实施例，步骤S5中，所述石墨片包括：多个第一石墨片单元，多个所述第一石墨片单元依次串联，每个所述第一石墨片单元包括：横向石墨片，所述横向石墨片沿水平方向延伸，所述横向石墨片包括多个沿水平方向依次串联的所述电路单元，每个所述电路单元沿上下方向延伸；竖向石墨片，所述竖向石墨片沿上下方向延伸，所述竖向石墨片的上端或下端与所述横向石墨片串联，所述竖向石墨片包括多个沿上下方向依次串联的所述电路单元，每个所述电路单元沿水平方向延伸。According to an embodiment of the present invention, in step S5, the graphite sheet includes: a plurality of first graphite sheet units, the plurality of first graphite sheet units are connected in series in sequence, and each of the first graphite sheet units includes: a transverse graphite sheet sheet, the transverse graphite sheet extends in the horizontal direction, the transverse graphite sheet includes a plurality of the circuit units connected in series along the horizontal direction, and each of the circuit units extends in the up-down direction; the vertical graphite sheet, the vertical graphite sheet The graphite sheet extends in the up-down direction, the upper or lower end of the vertical graphite sheet is connected in series with the horizontal graphite sheet, and the vertical graphite sheet includes a plurality of the circuit units connected in series along the up-down direction. The circuit unit extends in the horizontal direction.
根据本发明一个实施例，步骤S5中，在所述石墨基材上采用模切机进行模切成型或者采用激光切割，得到所述石墨片。According to an embodiment of the present invention, in step S5, a die-cutting machine or laser cutting is performed on the graphite substrate to obtain the graphite sheet.
根据本发明一个实施例，步骤S5中，所述石墨片包括：多个第二石墨片单元，多个所述第二石墨片单元依次串联，每个所述第二石墨片单元包括：至少两个分肢，两个所述分肢沿上下方向间隔开分布且沿上下方向并联，每个所述分肢的至少一个端部与相邻的所述第二石墨片单元串联。According to an embodiment of the present invention, in step S5, the graphite sheet includes: a plurality of second graphite sheet units, the plurality of second graphite sheet units are connected in series in sequence, and each second graphite sheet unit includes: at least two There are two sub-limbs, the two sub-limbs are spaced apart in the up-down direction and are connected in parallel in the up-down direction, and at least one end of each sub-limb is connected in series with the adjacent second graphite sheet unit.
根据本发明一个实施例，每个所述第二石墨片单元中的分肢的数量为两个，两个所述分肢中的任一个所述分肢形成为开口朝向另一所述分肢所在方向设置的凹字形件。According to an embodiment of the present invention, the number of the limbs in each of the second graphite sheet units is two, and any one of the two limbs is formed such that the opening faces the other limb The concave piece set in the direction.
根据本发明一个实施例，所述电路单元的导热性能为300W/mk-1800W/mk。According to an embodiment of the present invention, the thermal conductivity of the circuit unit is 300W/mk-1800W/mk.
根据本发明第二方面实施例的远红外加热用石墨片，根据上述任一实施例所述的制备方法制备而成。The graphite sheet for far-infrared heating according to the embodiment of the second aspect of the present invention is prepared according to the preparation method described in any of the above embodiments.
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:
图1是根据本发明的一实施例的远红外加热用石墨片的制备方法的流程图；1 is a flow chart of a method for preparing a graphite sheet for far-infrared heating according to an embodiment of the present invention;
图2是根据本发明的一实施例的远红外加热用石墨片的结构示意图；2 is a schematic structural diagram of a graphite sheet for far-infrared heating according to an embodiment of the present invention;
图3是图2中A区域的放大示意图；Fig. 3 is the enlarged schematic diagram of A area in Fig. 2;
图4是根据本发明的一实施例的远红外加热用石墨片的电路单元的结构示意图；4 is a schematic structural diagram of a circuit unit of a graphite sheet for far-infrared heating according to an embodiment of the present invention;
图5是根据本发明的又实施例的远红外加热用石墨片的结构示意图。5 is a schematic structural diagram of a graphite sheet for far-infrared heating according to another embodiment of the present invention.
附图标记：Reference number:
石墨片100； Graphite sheet 100;
第一石墨片单元10；横向石墨片11；竖向石墨片12；电路单元13；The first graphite sheet unit 10; the horizontal graphite sheet 11; the vertical graphite sheet 12; the circuit unit 13;
第二石墨片单元20；分肢21。The second graphite sheet unit 20; the limbs 21.
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientation or positional relationship indicated by "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or element It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, features delimited with "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.
下面参考附图具体描述根据本发明实施例的远红外加热用石墨片的制备方法。The method for preparing the far-infrared heating graphite sheet according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
如图1所示，根据本发明实施例的远红外加热用石墨片的制备方法，包括以下步骤：S1、获取能够进行碳化和石墨化处理的高分子基材，高分子基材为具有第一厚度的片状；S2、对高分子基材进行热分解，得到第二厚度的石墨基材；S3、在石墨基材上设定一个电路单元13，根据石墨基材的厚度和电阻率，计算电路单元13的电阻值R1；S4、根据石墨片需要的电阻值R，计算需要在石墨基材上设定的电路单元13的个数；S5、在石墨基材上制备对应个数的电路单元13，得到石墨片。As shown in FIG. 1 , the method for preparing a graphite sheet for far-infrared heating according to an embodiment of the present invention includes the following steps: S1. Obtaining a polymer substrate capable of carbonization and graphitization, wherein the polymer substrate has a first thickness of the sheet; S2, thermally decompose the polymer substrate to obtain a graphite substrate with a second thickness; S3, set a circuit unit 13 on the graphite substrate, and calculate according to the thickness and resistivity of the graphite substrate The resistance value R1 of the circuit unit 13; S4, calculate the number of circuit units 13 that need to be set on the graphite substrate according to the resistance value R required by the graphite sheet; S5, prepare the corresponding number of circuit units on the graphite substrate 13. Graphite flakes are obtained.
换言之，根据本发明实施例的远红外加热用石墨片的制备方法，主要采用以下步骤：首先，获取高分子基材，高分子基材具有第一厚度且形成为片状材料；然后，将该高分子基材依次进行碳化和石墨化处理，得到具有第二厚度的石墨基材；随后，在石墨基材上设定一个电路单元13，计算电路单元13的电阻值R1，其中，石墨基材的厚度越厚，电阻越小，厚度越薄，电阻越大；接着，根据石墨片需要的电阻值R，在石墨片上进行电路设计，计算出需要在石墨基材上设定的电路单元13的个数，电路设计的过程主要根据石墨基材的厚度、电阻率和产品尺寸进行设计；最后，在石墨基材上制备对应个数的电路单元13，得到石墨片。In other words, the method for preparing a graphite sheet for far-infrared heating according to an embodiment of the present invention mainly adopts the following steps: first, obtaining a polymer base material, which has a first thickness and is formed into a sheet-like material; The polymer substrate is sequentially carbonized and graphitized to obtain a graphite substrate with a second thickness; then, a circuit unit 13 is set on the graphite substrate, and the resistance value R1 of the circuit unit 13 is calculated, wherein the graphite substrate is The thicker the thickness of the graphite sheet, the smaller the resistance, the thinner the thickness, the greater the resistance; then, according to the required resistance value R of the graphite sheet, the circuit design is carried out on the graphite sheet, and the circuit unit 13 that needs to be set on the graphite substrate is calculated. The circuit design process is mainly designed according to the thickness, resistivity and product size of the graphite substrate; finally, a corresponding number of circuit units 13 are prepared on the graphite substrate to obtain a graphite sheet.
由此，根据本发明实施例的远红外加热用石墨片的制备方法能够制备得到具有优异的导热性能的石墨片，导热系数高达1800W/mk，发热量高，而且，可通过设计产品结构对石墨片的形状和尺寸进行自由调节。Therefore, according to the preparation method of the graphite sheet for far-infrared heating according to the embodiment of the present invention, a graphite sheet with excellent thermal conductivity can be prepared, the thermal conductivity is as high as 1800W/mk, and the calorific value is high. The shape and size of the slices can be freely adjusted.
根据本发明的一个实施例，步骤S2包括：S21、获取高分子基材，进行碳化处理得到碳化基材；S22、将碳化基材进行升温处理，使其逐步达到石墨化温度；S23、在石墨化温度范围内，选择温度参考点，以温度参考点为参照温度，在阈值范围的变化范围内进行周期性振荡，其中在整个石墨化温度范围内，所完成的振荡周期为三次以上，能够制备得到高导热石墨膜。石墨化温度优选为2300-3000℃，步骤S22中主要通过升温曲线调节温度、升温速率和保温时间，保温时间优选为20min-200min。According to an embodiment of the present invention, step S2 includes: S21, obtaining a polymer substrate, and performing carbonization treatment to obtain a carbonized substrate; S22, performing a heating treatment on the carbonized substrate to gradually reach the graphitization temperature; S23, in graphite Within the range of the graphitization temperature, select the temperature reference point, take the temperature reference point as the reference temperature, and perform periodic oscillation within the variation range of the threshold range. A high thermal conductivity graphite film is obtained. The graphitization temperature is preferably 2300-3000° C. In step S22, the temperature, the heating rate and the holding time are mainly adjusted by the heating curve, and the holding time is preferably 20min-200min.
进一步地，第一厚度为20μm-250μm，第二厚度为50μm-400μm。Further, the first thickness is 20 μm-250 μm, and the second thickness is 50 μm-400 μm.
在本发明的一些具体实施方式中，高分子基材为聚酰亚胺，聚酰亚胺为导热薄膜。In some specific embodiments of the present invention, the polymer substrate is polyimide, and the polyimide is a thermally conductive film.
根据本发明的一个实施例，步骤S3中，电路单元13为矩形件，矩形件的长度为L，宽度为m
1，厚度为H，电阻率为ρ，截面积S1＝m
1*H，电路单元13的电阻R
1＝ρ*L/S
1，例如：设定一个长度L为0.1mm，宽度m
1为1.5mm的方格为一个电路单元13，其厚度H假定为200μm，其截面积为S1＝m
1*H，即为0.3mm
2。根据电阻率ρ可以计算出每个电路单元13的电阻R
1，R
1＝ρL/S1，得到单元电阻R
1为0.000033Ω。步骤S4中，假定石墨 片需要的电阻值R为12Ω，在电路单元13均为串联连接的情况下，需要363637个电路单元13，将这些电路单元13以一定形状进行排列调整分布，实现线路化分布。
According to an embodiment of the present invention, in step S3, the circuit unit 13 is a rectangular piece, the length of the rectangular piece is L, the width is m 1 , the thickness is H, the resistivity is ρ, the cross-sectional area S1=m 1 *H, the circuit The resistance R 1 of the unit 13 =ρ*L/S 1 . For example, a square with a length L of 0.1 mm and a width m 1 of 1.5 mm is set as a circuit unit 13 , its thickness H is assumed to be 200 μm, and its cross-sectional area is It is S1=m 1 *H, which is 0.3 mm 2 . The resistance R 1 of each circuit unit 13 can be calculated according to the resistivity ρ, R 1 =ρL/S1, and the unit resistance R 1 is obtained as 0.000033Ω. In step S4, it is assumed that the resistance value R required by the graphite sheet is 12Ω, and in the case that the circuit units 13 are all connected in series, 363,637 circuit units 13 are required, and these circuit units 13 are arranged in a certain shape to adjust and distribute to realize circuitization. distributed.
在本发明的一些具体实施方式中，步骤S4中，多个电路单元13串联，需要在石墨基材上设定的电路单元13的个数N＝R/R
1。
In some specific embodiments of the present invention, in step S4, a plurality of circuit units 13 are connected in series, and the number of circuit units 13 that needs to be set on the graphite substrate is N=R/R 1 .
如图2和图3所示，根据本发明的一个实施例，步骤S5中，石墨片包括多个第一石墨片单元10，多个第一石墨片单元10依次串联，每个第一石墨片单元10包括：横向石墨片11和竖向石墨片12，横向石墨片11沿水平方向延伸，横向石墨片11包括多个沿水平方向依次串联的电路单元13，每个电路单元13沿上下方向延伸，竖向石墨片12沿上下方向延伸，竖向石墨片12的上端或下端与横向石墨片11串联，竖向石墨片12包括多个沿上下方向依次串联的电路单元13，每个电路单元13沿水平方向延伸，通过采用横向石墨片11和竖向石墨片12相配合，能够通过设计产品结构对石墨片的形状和尺寸进行自由调节。As shown in FIG. 2 and FIG. 3, according to an embodiment of the present invention, in step S5, the graphite sheet includes a plurality of first graphite sheet units 10, and the plurality of first graphite sheet units 10 are connected in series in sequence, and each first graphite sheet The unit 10 includes: a transverse graphite sheet 11 and a vertical graphite sheet 12, the transverse graphite sheet 11 extends in the horizontal direction, and the transverse graphite sheet 11 includes a plurality of circuit units 13 connected in series along the horizontal direction, and each circuit unit 13 extends in the up-down direction , the vertical graphite sheet 12 extends in the up-down direction, the upper or lower end of the vertical graphite sheet 12 is connected in series with the horizontal graphite sheet 11, and the vertical graphite sheet 12 includes a plurality of circuit units 13 connected in series along the upper and lower directions, and each circuit unit 13 Extending in the horizontal direction, the shape and size of the graphite sheet can be freely adjusted by designing the product structure by using the horizontal graphite sheet 11 and the vertical graphite sheet 12 to cooperate.
可选地，步骤S5中，在石墨基材上采用模切机进行模切成型，得到石墨片。另外，还可以选用激光方式在石墨基材上得到石墨片。Optionally, in step S5, a die-cutting machine is used to perform die-cutting on the graphite substrate to obtain a graphite sheet. In addition, a laser method can also be used to obtain a graphite sheet on a graphite substrate.
如图5所示，根据本发明的一个实施例，步骤S5中，石墨片包括：多个第二石墨片单元20，多个第二石墨片单元20依次串联，每个第二石墨片单元20包括：至少两个分肢21，两个分肢21沿上下方向间隔开分布且沿上下方向并联，每个分肢21的至少一个端部与相邻的第二石墨片单元20串联，该实施例采用串并联相结合的方式实现导热。在相邻两个第二石墨片单元20之间可设有连接肢，通过连接肢与分肢21相邻，实现串联。As shown in FIG. 5, according to an embodiment of the present invention, in step S5, the graphite sheet includes: a plurality of second graphite sheet units 20, the plurality of second graphite sheet units 20 are connected in series in sequence, and each second graphite sheet unit 20 Including: at least two sub-limbs 21, the two sub-limbs 21 are spaced apart along the up-down direction and parallel in the up-down direction, at least one end of each sub-limb 21 is connected in series with the adjacent second graphite sheet unit 20, this implementation For example, a combination of series and parallel is used to achieve heat conduction. Connecting limbs may be provided between two adjacent second graphite sheet units 20, and the connecting limbs are adjacent to the split limbs 21 to realize series connection.
在本发明的一些具体实施方式中，每个第二石墨片单元20中的分肢21的数量为两个，两个分肢21中的任一个分肢21形成为开口朝向另一分肢21所在方向设置的凹字形件。In some specific embodiments of the present invention, the number of the limbs 21 in each second graphite sheet unit 20 is two, and any limb 21 of the two limbs 21 is formed with an opening facing the other limb 21 The concave piece set in the direction.
在本发明的一些具体实施方式中，电路单元13的导热性能为300W/mk-1800W/mk。In some specific embodiments of the present invention, the thermal conductivity of the circuit unit 13 is 300W/mk-1800W/mk.
总而言之，根据本发明实施例中的远红外加热用石墨片的制备方法，不仅能够有效的制备得到具有优异的导热性能的石墨片，还能够通过设计产品结构对石墨片的形状和尺寸进行自由调节。All in all, according to the preparation method of the graphite sheet for far-infrared heating in the embodiment of the present invention, not only the graphite sheet with excellent thermal conductivity can be effectively prepared, but also the shape and size of the graphite sheet can be freely adjusted by designing the product structure. .
根据本发明实施例的远红外加热用石墨片包括根据上述实施例的远红外加热用石墨片的制备方法，由于根据本发明实施例的远红外加热用石墨片的制备方法具有上述技术效果，因此，根据本发明实施例的远红外加热用石墨片也具有相应的技术效果，即具有优异的导热性能，发热量大，便于根据产品的结构对石墨片进行调节等优点。The far-infrared heating graphite sheet according to the embodiment of the present invention includes the preparation method of the far-infrared heating graphite sheet according to the above-mentioned embodiment. Since the preparation method of the far-infrared heating graphite sheet according to the embodiment of the present invention has the above technical effect, therefore , The graphite sheet for far-infrared heating according to the embodiment of the present invention also has corresponding technical effects, that is, it has the advantages of excellent thermal conductivity, large calorific value, and it is convenient to adjust the graphite sheet according to the structure of the product.
根据本发明实施例的远红外加热用石墨片的其他结构和操作对于本领域技术人员而言都是可以理解并且容易实现的，因此不再详细描述。Other structures and operations of the far-infrared heating graphite sheet according to the embodiment of the present invention can be understood and easily realized by those skilled in the art, and therefore will not be described in detail.
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is meant to incorporate the embodiments A particular feature, structure, material, or characteristic described by an example or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
尽管已经示出和描述了本发明的实施例，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.
Claims (12)
- 一种远红外加热用石墨片的制备方法，其特征在于，包括以下步骤：A preparation method of graphite sheet for far-infrared heating, characterized in that, comprising the following steps:S1、获取能够进行碳化和石墨化处理的高分子基材，所述高分子基材为具有第一厚度的片状；S1. Obtain a polymer substrate capable of carbonization and graphitization, wherein the polymer substrate is a sheet with a first thickness;S2、对所述高分子基材进行热分解，得到第二厚度的石墨基材；S2, thermally decomposing the polymer substrate to obtain a graphite substrate with a second thickness;S3、在所述石墨基材上设定一个电路单元，根据所述石墨基材的厚度和电阻率，计算所述电路单元的电阻值R1；S3, setting a circuit unit on the graphite substrate, and calculating the resistance value R1 of the circuit unit according to the thickness and resistivity of the graphite substrate;S4、根据石墨片需要的电阻值R，计算需要在所述石墨基材上设定的电路单元的个数；S4, according to the resistance value R required by the graphite sheet, calculate the number of circuit units that need to be set on the graphite substrate;S5、在所述石墨基材上制备对应个数的所述电路单元，得到所述石墨片。S5, preparing a corresponding number of the circuit units on the graphite substrate to obtain the graphite sheet.
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，步骤S2包括：The preparation method of far-infrared heating graphite sheet according to claim 1, is characterized in that, step S2 comprises:S21、获取所述高分子基材，进行碳化处理得到碳化基材；S21, obtaining the polymer substrate, and performing carbonization treatment to obtain a carbonized substrate;S22、将所述碳化基材进行升温处理，使其逐步达到石墨化温度；S22, heating the carbonized substrate to gradually reach the graphitization temperature;S23、在石墨化温度范围内，选择温度参考点，以所述温度参考点为参照温度，在阈值范围的变化范围内进行周期性振荡，其中在整个所述石墨化温度范围内，所完成的振荡周期为三次以上。S23, within the graphitization temperature range, select a temperature reference point, take the temperature reference point as the reference temperature, and perform periodic oscillation within the variation range of the threshold range, wherein in the entire graphitization temperature range, the completed The oscillation period is three or more times.
- 根据权利要求2所述的远红外加热用石墨片的制备方法，其特征在于，所述第一厚度为20μm-250μm，所述第二厚度为50μm-400μm。The method for preparing a far-infrared heating graphite sheet according to claim 2, wherein the first thickness is 20 μm-250 μm, and the second thickness is 50 μm-400 μm.
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，所述高分子基材为聚酰亚胺。The method for preparing a far-infrared heating graphite sheet according to claim 1, wherein the polymer base material is polyimide.
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，步骤S3中，所述电路单元为矩形件，所述矩形件的长度为L，宽度为m 1，厚度为H，电阻率为ρ，截面积S1＝m 1*H，所述电路单元的电阻R 1＝ρ*L/S 1。 The method for preparing a graphite sheet for far-infrared heating according to claim 1, wherein in step S3, the circuit unit is a rectangular piece, the length of the rectangular piece is L, the width is m 1 , and the thickness is H , the resistivity is ρ, the cross-sectional area S1=m 1 *H, and the resistance of the circuit unit R 1 =ρ*L/S 1 .
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，步骤S4中，多个所述电路单元串联，需要在所述石墨基材上设定的电路单元的个数N＝R/R 1。 The method for preparing a graphite sheet for far-infrared heating according to claim 1, wherein in step S4, a plurality of the circuit units are connected in series, and the number N of circuit units that need to be set on the graphite substrate =R/R 1 .
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，步骤S5中，所述石墨片包括：The method for preparing a graphite sheet for far-infrared heating according to claim 1, wherein in step S5, the graphite sheet comprises:多个第一石墨片单元，多个所述第一石墨片单元依次串联，每个所述第一石墨片单元包括：A plurality of first graphite sheet units, the plurality of first graphite sheet units are connected in series in sequence, and each of the first graphite sheet units includes:横向石墨片，所述横向石墨片沿水平方向延伸，所述横向石墨片包括多个沿水平方向依次串联的所述电路单元，每个所述电路单元沿上下方向延伸；a transverse graphite sheet, the transverse graphite sheet extending in the horizontal direction, the transverse graphite sheet including a plurality of the circuit units serially connected in series along the horizontal direction, each of the circuit units extending in the up-down direction;竖向石墨片，所述竖向石墨片沿上下方向延伸，所述竖向石墨片的上端或下端与所述横向石墨片串联，所述竖向石墨片包括多个沿上下方向依次串联的所述电路单元，每个所述电路单元沿水平方向延伸。The vertical graphite sheet, the vertical graphite sheet extends in the up-down direction, the upper end or the lower end of the vertical graphite sheet is connected in series with the horizontal graphite sheet, and the vertical graphite sheet includes a plurality of all the vertical graphite sheets connected in series along the up-down direction. The circuit units each extend in a horizontal direction.
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，步骤S5中，所述石墨片包括：The method for preparing a graphite sheet for far-infrared heating according to claim 1, wherein in step S5, the graphite sheet comprises:多个第二石墨片单元，多个所述第二石墨片单元依次串联，每个所述第二石墨片单元包括：A plurality of second graphite sheet units, the plurality of second graphite sheet units are connected in series in sequence, and each of the second graphite sheet units includes:至少两个分肢，两个所述分肢沿上下方向间隔开分布且沿上下方向并联，每个所述分肢的至少一个端部与相邻的所述第二石墨片单元串联。At least two limbs, the two limbs are spaced apart in the up-down direction and parallel in the up-down direction, and at least one end of each limb is connected in series with the adjacent second graphite sheet unit.
- 根据权利要求8所述的远红外加热用石墨片的制备方法，其特征在于，每个所述第二石墨片单元中的分肢的数量为两个，两个所述分肢中的任一个所述分肢形成为开口朝向另一所述分肢所在方向设置的凹字形件。The method for preparing a graphite sheet for far-infrared heating according to claim 8, wherein the number of the limbs in each of the second graphite sheet units is two, and any one of the two limbs The split limbs are formed as concave-shaped pieces with openings facing the direction of the other split limbs.
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，步骤S5中，在所述石墨基材上采用模切机进行模切成型或者采用激光切割，得到所述石墨片。The method for preparing a graphite sheet for far-infrared heating according to claim 1, wherein in step S5, a die-cutting machine is used for die-cutting or laser cutting on the graphite substrate to obtain the graphite piece.
- 根据权利要求1所述的远红外加热用石墨片的制备方法，其特征在于，所述电路单元的导热性能为300W/mk-1800W/mk。The method for preparing a graphite sheet for far-infrared heating according to claim 1, wherein the thermal conductivity of the circuit unit is 300W/mk-1800W/mk.
- 一种远红外加热用石墨片，其特征在于，根据所述权利要求1-11中任一所述的制备方法制备而成。A graphite sheet for far-infrared heating, characterized in that it is prepared according to the preparation method described in any one of claims 1-11.
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