Multifunctional PTC graphene heating skin and preparation method thereof

Abstract

The present invention provides a multifunctional PTC graphene heating surface and a preparation method thereof, belonging to the technical field of light-transmissive coating finishes for automotive interiors. The surface comprises a surface layer, a pattern layer, an electrode layer, a graphene heating layer, a capacitive touch layer, a pressure layer, a second control electrode layer, and a protective layer. The multifunctional PTC graphene heating surface integrates touch, pressure, display, and heating. The touch function is combined with the pressure function, meaning that only when there is a touch signal and the pressure signal reaches a threshold is the touch recognized as valid and the corresponding function executed, effectively eliminating the need for touch. Furthermore, the integrated PTC electric heating function provides a comfortable touch temperature for users in vehicle interiors even in winter, making it extremely practical. The light-transmissive display function also enhances the interior atmosphere.

Description

Technical Field

[0001] The present invention relates to the technical field of light-transmissive coating finishes in automobile interiors, and more specifically to a multifunctional PTC graphene heating skin integrating touch, pressure, display and heating, and a preparation method thereof. Background Art

[0002] As people's living standards continue to improve, their demands for automotive performance, appearance, and safety are increasing, and so are their requirements for the interior environment. The covers used to cover automotive accessories are widely used, offering not only color and pattern but also a soft, resilient feel. If these covers could provide light-transmitting display capabilities while integrating ambient lighting, touch, and pressure touch, the functionality of interior products would be greatly enhanced. Furthermore, during the cold winter months, when vehicle interior temperatures are low, a cover with a heating function would provide a comfortable feel even in the cold. Unfortunately, there is currently no such multifunctional cover on the market that integrates touch, pressure, display, and heating.

[0003] In view of the above situation, there is a need to design a multifunctional surface that integrates touch, pressure, display and heating. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional PTC graphene heating surface that integrates touch, pressure, display and heating, and a preparation method thereof, which greatly improves the functionality of interior products. In particular, the introduction of the heating function enables the vehicle interior to provide users with a comfortable touch temperature even in winter, which is extremely practical.

[0005] The technical solution of the present invention is:

[0006] A multifunctional PTC graphene heating skin, comprising a surface layer, a pattern layer, an electrode layer, a graphene heating layer, a capacitive touch layer, a pressure layer, a second control electrode layer and a protective layer;

[0007] The pattern layer is attached to the surface layer, and the pattern layer includes a light-shielding area and a light-transmitting area, wherein the shape of the light-transmitting area is the pattern on the pattern layer, and the pattern includes a heat-down pattern, three gear indication patterns and a heat-up pattern;

[0008] The electrode layer is coated on the light-shielding area of ​​the pattern layer, and includes a heating electrode and a first control electrode, wherein the first control electrode includes two pressure contact first electrodes with notches, a ground wire group surrounding the pressure contact first electrodes, and a capacitor functional lead and a pressure contact second electrode functional lead corresponding to the pressure contact first electrodes are further provided within the surrounding range of the ground wire group, wherein one pressure contact first electrode surrounds a thermal downshift pattern, and the other pressure contact first electrode surrounds a thermal upshift pattern, and both ends of the ground wire group, the capacitor functional lead, and the pressure contact second electrode functional lead are led out in a wiring manner; the heating electrode includes a heating electrode positive main line and a plurality of heating electrode positive branch lines led out therefrom, a heating electrode negative main line and a plurality of heating electrode negative branch lines led out therefrom, and the heating electrode positive branch lines and the heating electrode negative branch lines are arranged alternately;

[0009] The graphene heating layer is coated on the area where the heating electrode is located on the light-shielding area of ​​the pattern layer;

[0010] The capacitive touch layer is printed on the pattern layer and includes capacitive touch contacts and capacitive touch contact leads, wherein the capacitive touch contacts are respectively arranged within the range surrounded by the two pressure contact first electrodes and correspondingly cover the thermal downshift pattern and the heated upshift pattern, and the capacitive touch contact leads are led out from the notch and combined with the capacitive function leads;

[0011] The pressure layer is printed on the light shielding area of ​​the pattern layer and the electrode layer, and includes a pressure contact with a notch, the pressure contact having the same pattern as the first pressure contact electrode and completely covering the first pressure contact electrode in a non-overlapping manner;

[0012] The second control electrode layer is printed on the pressure layer and includes a pressure contact second electrode with a notch and a pressure contact second electrode lead wire, wherein the pressure contact second electrode is completely placed on the pressure contact, and the pattern size of the pressure contact second electrode is exactly the same as that of the pressure contact first electrode, and is symmetrically arranged on both sides of the pressure contact, and the pressure contact second electrode lead wire is connected to the pressure contact second electrode functional lead wire;

[0013] The protective layer is coated on the surface layer, completely covering the pattern layer, the electrode layer, the graphene heating layer, the capacitive touch layer, the pressure layer and the second control electrode layer;

[0014] The ground wire group is functional ground I, functional ground II, and shielding ground I from the inside to the outside. The first electrode of the pressure contact is connected to the functional ground I and functional ground II through the lead wires of the first electrode of the pressure contact. The middle part of the shielding ground I is connected to the cable through two leads.

[0015] Furthermore, the electrode layer and the second control electrode layer are both made of metallic silver.

[0016] Furthermore, the material of the pressure layer is pressure ink, and the pressure range is 100g to 2000g.

[0017] Furthermore, the material of the capacitive touch layer is capacitive ink, and the capacitive touch layer needs to be electrically isolated from the pressure layer, with a distance greater than 1 mm.

[0018] Furthermore, the material of the surface layer is selected from any one of PET, PVC, PP, PI, PU, ​​TPU, PUR, TPO, PC, PMMA and ABS, and has a thickness of 0.05 mm to 5 mm.

[0019] Furthermore, the capacitive touch contact may be in the shape of a circle or a polygon, or a combination thereof.

[0020] Furthermore, the protective layer is a transparent insulating protective ink layer or a varnish layer.

[0021] Furthermore, the light transmittance of the capacitive touch layer is greater than 90%.

[0022] Furthermore, the light transmittance of the surface layer is greater than 90%.

[0023] A method for preparing a multifunctional PTC graphene heating skin, the method comprising the following steps:

[0024] Step 1: Curing the surface layer, wherein the surface layer is selected from any one of PET, PVC, PP, PI, PU, ​​TPU, PUR, TPO, PC, PMMA and ABS with good light transmittance, and has a thickness of 0.05 mm to 5 mm;

[0025] Step 2: A pattern layer is provided on the surface layer by any method of printing, hot stamping or transfer printing, wherein the pattern layer includes a light-shielding area and a light-transmitting area, wherein the light-transmitting area has no printed material and the light-shielding area is printed with light-shielding material, and the shape of the light-transmitting area is the pattern on the pattern layer, and the pattern includes a heat-down pattern, three gear indication patterns and a heat-up pattern;

[0026] Step 3: Applying a low-temperature curing, low-square-resistance, stretchable conductive silver paste on the light-shielding area of ​​the pattern layer, and curing to form an electrode layer; wherein the electrode layer includes a heating electrode and a first control electrode;

[0027] The first control electrode includes two pressure contact first electrodes with notches, a ground wire group surrounding the pressure contact first electrodes, and capacitor function leads and pressure contact second electrode function leads corresponding to the pressure contact first electrodes are further provided within the surrounding range of the ground wire group. One of the pressure contact first electrodes surrounds a thermal downshift pattern, and the other pressure contact first electrode surrounds a thermal upshift pattern. The two ends of the ground wire group, the capacitor function leads, and the pressure contact second electrode function leads are led out in a wire arrangement. The hot electrode includes a heating electrode positive main line and a plurality of heating electrode positive branch lines led out therefrom, a heating electrode negative main line and a plurality of heating electrode negative branch lines led out therefrom, and the heating electrode positive branch lines and the heating electrode negative branch lines are arranged alternately.

[0028] Step 4: Printing graphene heating ink in the area where the heating electrode is located on the light-shielding area of ​​the pattern layer, and forming a graphene heating layer after drying;

[0029] Step 5: Printing capacitive ink on the first control electrode area on the light-shielding area of ​​the pattern layer, and forming a capacitive touch layer after drying. The capacitive touch layer includes capacitive touch contacts and capacitive touch contact leads. The capacitive touch contacts are respectively arranged within the range surrounded by the two pressure contact first electrodes and correspondingly cover the thermal downshift pattern and the heated upshift pattern. The capacitive touch contact leads are led out from the notch and combined with the capacitive functional leads.

[0030] Step 6: Printing and drying pressure ink on the light-shielding area of ​​the pattern layer and the electrode layer to form a pressure layer, wherein the pressure layer includes pressure contacts with notches, the pressure contacts having the same pattern as the pressure contact first electrodes and completely covering the pressure contact first electrodes in a non-overlapping manner;

[0031] Step 7: Applying a low-temperature curing, low-square-resistance, stretchable conductive silver paste on the pressure layer to form a second control electrode layer after curing. The second control electrode layer includes a pressure contact second electrode with a notch and a pressure contact second electrode lead wire. The pressure contact second electrode is completely placed on the pressure contact. The pattern size of the pressure contact second electrode is exactly the same as that of the pressure contact first electrode. The pressure contact second electrode lead wire is symmetrically arranged on both sides of the pressure contact. The pressure contact second electrode lead wire is connected to the pressure contact second electrode functional lead wire.

[0032] Step 8: Coating a transparent insulating protective ink or varnish on the surface layer and drying it to form a protective layer, which completely covers the pattern layer, electrode layer, graphene heating layer, capacitive touch layer, pressure layer and second control electrode layer;

[0033] Step nine: The multifunctional PTC graphene heating skin that has completed the above process is cut by die-cutting to form a product.

[0034] Furthermore, the shape of the capacitive touch contact in step five may be a combination of one or more of a circle and a polygon.

[0035] Furthermore, the pressure range of the pressure ink in step seven is 100g to 2000g.

[0036] Furthermore, the capacitive touch layer in step five and the pressure layer in step six are electrically isolated, with a distance greater than 1 mm.

[0037] Furthermore, the graphene ink material in step 4 is formed by adding graphene powder to a high molecular weight resin.

[0038] Furthermore, the graphene ink material in step 4 has PTC characteristics and can control the temperature independently.

[0039] The present invention adopting the above technical solution can bring the following beneficial effects:

[0040] The multifunctional PTC graphene heating surface provided by this invention integrates touch, pressure, display, and heating. The touch and pressure functions are combined. Only when there is a touch signal and the pressure signal reaches a threshold is the touch recognized as valid and the corresponding function executed, effectively eliminating the need for touch. Furthermore, the integrated PTC electric heating function provides a comfortable touch temperature for users even in winter, making it extremely practical. The light-transmitting display function also enhances the interior atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure;

[0042] Figure 2 Schematic diagram of the pattern layer structure;

[0043] Figure 3 Schematic diagram of the electrode layer structure;

[0044] Figure 4 Schematic diagram of the graphene heating layer structure;

[0045] Figure 5 Schematic diagram of the pressure layer structure;

[0046] Figure 6 is a schematic diagram of the structure of the second electrode layer;

[0047] Figure 7 Schematic diagram of the capacitive touch layer structure;

[0048] Figure 8 Schematic diagram of the protective layer structure;

[0049] Figure 9Schematic diagram of the stacking relationship between the heating shift-up pattern and the first pressure contact electrode 10A, the pressure contact 20A, the second pressure contact electrode 40A, and the capacitive touch contact 30A;

[0050] Figure 10 A schematic diagram is shown for explanation;

[0051] Figure 11 It is a process flow chart.

[0052] In the figure, 1-surface layer, 2-pattern layer, 3-electrode layer, 4-graphene heating layer, 5-capacitive touch layer, 6-pressure layer, 7-second control electrode layer, 8-protective layer; 10A-pressure contact first electrode; 10B-pressure contact first electrode lead wire; 10C-functional ground I; 10D-functional ground II; 10E-shielding ground I; 20A-pressure contact; 30A-capacitive touch contact; 30B-capacitive touch contact lead wire; 40A-pressure contact second electrode; 40B-pressure contact second electrode lead wire; 50A-heating upshift pattern; 50B-heating downshift pattern; 60A-heating electrode positive main line; 60B-heating electrode positive branch line, 70A-heating electrode negative main line; 70B-heating electrode negative branch line. DETAILED DESCRIPTION

[0053] like Figure 1-9 As shown, a multifunctional PTC graphene heating skin is characterized by comprising a surface layer 1, a pattern layer 2, an electrode layer 3, a graphene heating layer 4, a capacitive touch layer 5, a pressure layer 6, a second control electrode layer 7 and a protective layer 8;

[0054] The material of the surface layer 1 is selected from any one of light-transmitting PET, PVC, PP, PI, PU, ​​TPU, PUR, TPO, PC, PMMA and ABS, with a light transmittance greater than 90% and a thickness of 0.05 mm to 5 mm;

[0055] The pattern layer 2 is attached to the surface layer 1 and includes a light-shielding area and a light-transmitting area. The shape of the light-transmitting area is the pattern on the pattern layer 2. To match the heating function, in this embodiment, the pattern includes a heat-down pattern 50B, three gear indication patterns, and a heat-up pattern 50A. However, in fact, the pattern of the present invention is not limited to this, and other functional / decorative patterns can also be provided.

[0056] The electrode layer 3 is coated on the shading area of ​​the pattern layer 2, which includes a heating electrode and a first control electrode, wherein the first control electrode includes two pressure contact first electrodes 10A with notches, a ground wire group surrounding the pressure contact first electrodes 10A, and a capacitor function lead 30C and a pressure contact second electrode function lead 40C corresponding to the pressure contact first electrodes 10A are also provided within the surrounding range of the ground wire group. One of the pressure contact first electrodes 10A surrounds the thermal downshift pattern 50B, and the other pressure contact first electrode 10A surrounds the heating upshift pattern 50A. The two ends of the ground wire group, the capacitor function lead 30C and the pressure contact second electrode function lead 40C are led out in a wiring manner and connected to the vehicle controller; the hot electrode includes a heating electrode positive main line 60A and a plurality of heating electrode positive branch lines 60B led out therefrom, a heating electrode negative main line 70A and a plurality of heating electrode negative branch lines 70B led out therefrom, the heating electrode positive branch lines 60B and the heating electrode negative branch lines 70B are arranged alternately; the heating electrode positive main line 60A and the heating electrode negative main line 70A are connected to the vehicle controller, and when 60B and 70B are energized, a heating pair of electrodes is formed. The electrode and the graphene heating layer are combined, so that the graphene layer can generate heat; the heating gear of the graphene layer is controlled by the touch point that integrates pressure and touch functions corresponding to the heating downshift pattern 50B and the heating upshift pattern 50A, wherein the touch pressure circuit is: 10C, 10D→10B→10A→20A→40A→40B→40C; the touch capacitance circuit is: 30A→30B→30C; in this embodiment, for the touch capacitance circuit, when a touch occurs, the touch capacitance circuit is connected; and for the touch pressure circuit, under the action of external pressure, the pressure is turned on. The internal molecular structure of the force ink changes, and at the same time, a change signal is generated, which can be used to determine the size and presence of pressure; only when the touch pressure reaches the set threshold will the pressure circuit be connected; and the judgment method of the present invention is that only when the touch capacitance circuit and the touch pressure circuit are connected at the same time, will the touch be determined to be valid and sent to the vehicle controller, and the heating gear is adjusted according to the user's effective touch operation. The lighting of the three gear indicator patterns shows the current heating gear. The lighting of the gear indicator patterns is realized by LED light sheets, and the LED light sheets are controlled by the vehicle controller;

[0057] The graphene heating layer 4 is coated on the area where the heating electrode is located on the shading area of ​​the pattern layer 2. The graphene heating layer 4 has PTC characteristics and can control the temperature by itself. When the heating material reaches the set temperature, the temperature rise is stopped to ensure that the heating temperature is not too high and cause danger.

[0058] The capacitive touch layer 5 is formed by printing capacitive ink on the pattern layer 2. The capacitive touch layer 5 has a light transmittance greater than 90%. It includes capacitive touch contacts 30A and capacitive touch contact leads 30B. The capacitive touch contacts 30A are respectively arranged within the range surrounded by the two pressure contact first electrodes 10A and cover the thermal downshift pattern and the heated upshift pattern respectively. The capacitive touch contact leads 30B are led out from the notch and combined with the capacitive function leads 30C. The capacitive touch layer 5 must be electrically isolated from the pressure layer 6 by a distance greater than 1 mm, preferably greater than 3 mm. The capacitive touch contacts 30A can be circular or polygonal in shape, or a combination thereof.

[0059] The pressure layer 6 is formed by printing pressure ink with a pressure range of 100g to 2000g on the light-shielding area of ​​the pattern layer 2 and the electrode layer 3. The pressure layer 6 includes a pressure contact 20A with a notch. The pressure contact 20A has the same pattern as the first pressure contact electrode 10A and completely covers the first pressure contact electrode 10A in a non-overlapping manner. That is, the pattern width of the pressure contact 20A is larger than the pattern width of the first pressure contact electrode 10A.

[0060] The second control electrode layer 7 is printed on the pressure layer 6 and includes a notched pressure contact second electrode 40A and a pressure contact second electrode lead 40B. The pressure contact second electrode 40A is completely placed on the pressure contact 20A. The pattern size of the pressure contact second electrode 40A is exactly the same as that of the pressure contact first electrode 10A, and the pressure contact second electrode lead 40B is symmetrically arranged on both sides of the pressure contact 20A. The pressure contact second electrode lead 40B is connected to the pressure contact second electrode functional lead 40C.

[0061] The electrode layer 3 and the second control electrode layer 7 are both made of metallic silver;

[0062] The protective layer 8 is coated on the surface layer 1, completely covering the pattern layer 2, the electrode layer 3, the graphene heating layer 4, the capacitive touch layer 5, the pressure layer 6 and the second control electrode layer 7; the protective layer 8 is a transparent insulating protective ink layer or a varnish layer;

[0063] The ground wire group is composed of functional ground I10C, functional ground II10D, and shielding ground I10E from the inside to the outside. The pressure contact first electrode 10A is connected to the functional ground I10C and functional ground II10D through the pressure contact first electrode lead wire 10B. The middle part of the shielding ground I10E is connected to the cable through two leads. The shielding ground is designed as the outermost circle and is physically separated from the capacitive touch ground and pressure sensor ground to improve the product's anti-EMI and ESD performance.

[0064] like Figure 10The figure shows a display diagram of the present invention, wherein A is when the vehicle is not powered on, and the display is a normal surface without any pattern; B is when the vehicle is powered on and the heating is not turned on, and the display has a pattern; C is when the heating level 1 displays a pattern; D is when the heating level 2 displays a pattern; and E is when the heating level 3 displays a pattern.

[0065] like Figure 11 As shown, a method for preparing a multifunctional PTC graphene heating skin is characterized in that the method comprises the following steps:

[0066] Step 1: Curing the surface layer 1 by applying a fixed pressure and a slow temperature gradient to ensure that it does not shrink during the subsequent printing and drying process; the surface layer is selected from any one of PET, PVC, PP, PI, PU, ​​TPU, PUR, TPO, PC, PMMA and ABS with good light transmittance, and has a thickness of 0.05mm to 5mm;

[0067] Step 2: A pattern layer 2 is provided on the surface layer 1 by any method of printing, hot stamping, and transfer printing, wherein the pattern layer 2 includes a light-shielding area and a light-transmitting area, wherein the light-transmitting area has no printed material, and the light-shielding area is printed with a light-shielding material, and the shape of the light-transmitting area is the pattern on the pattern layer 2, and the pattern includes a heat-down pattern, three gear indication patterns, and a heat-up pattern. It should be noted that spraying can also be used to distinguish the light-shielding area from the light-transmitting area. The specific process of printing and spraying can be full printing or full spraying of the light-shielding material, and then laser engraving, etching, ion / electron beam subtraction are used to remove the pattern shape of the light-transmitting area and retain the light-shielding material in the light-shielding area;

[0068] Step 3: Applying a low-temperature curing, low-square-resistance, stretchable conductive silver paste on the light-shielding area of ​​the pattern layer 2, and forming an electrode layer 3 after curing; wherein the electrode layer 3 includes a heating electrode and a first control electrode;

[0069] The first control electrode includes two pressure contact first electrodes 10A with notches, a ground wire group surrounding the pressure contact first electrodes 10A, and a capacitor function lead 30C and a pressure contact second electrode function lead 40C corresponding to the pressure contact first electrodes 10A. One of the pressure contact first electrodes 10A surrounds a thermal downshift pattern, and the other pressure contact first electrode 10A surrounds a thermal upshift pattern. The two ends of the ground wire group, the capacitor function lead 30C, and the pressure contact second electrode function lead 40C are led out in a wire arrangement. The hot electrode includes a heating electrode positive main line 60A and a plurality of heating electrode positive branch lines 60B led out therefrom, a heating electrode negative main line 70A and a plurality of heating electrode negative branch lines 70B led out therefrom, the heating electrode positive branch lines 60B and the heating electrode negative branch lines 70B being arranged alternately.

[0070] Step 4: Printing graphene heating ink in the area where the heating electrode is located on the light-shielding area of ​​the pattern layer 2, and forming a graphene heating layer 4 after drying;

[0071] Step 5: Printing capacitive ink on the first control electrode area on the light-shielding area of ​​the pattern layer 2, and drying to form a capacitive touch layer 5. The capacitive touch layer 5 includes capacitive touch contacts 30A and capacitive touch contact leads 30B. The capacitive touch contacts 30A are respectively arranged within the area surrounded by the two pressure contact first electrodes 10A and cover the heat-down pattern and the heat-up pattern respectively. The capacitive touch contact leads 30B are led out from the notch and combined with the capacitive function leads 30C.

[0072] Step 6: Printing pressure ink on the light-shielding area of ​​the pattern layer 2 and the electrode layer 3 and drying it to form a pressure layer 6. The pressure layer 6 includes a pressure contact 20A with a notch. The pressure contact 20A has the same pattern as the first pressure contact electrode 10A and completely covers the first pressure contact electrode 10A in a non-overlapping manner.

[0073] Step 7: Applying a low-temperature curing, low-square-resistance, stretchable conductive silver paste on the pressure layer 6 to form a second control electrode layer 7 after curing. The second control electrode layer 7 includes a notched pressure contact second electrode 40A and a pressure contact second electrode lead 40B. The pressure contact second electrode 40A is completely placed on the pressure contact 20A. The pattern size of the pressure contact second electrode 40A is exactly the same as that of the pressure contact first electrode 10A, and the pressure contact second electrode lead 40B is symmetrically arranged on both sides of the pressure contact 20A. The pressure contact second electrode lead 40B is connected to the pressure contact second electrode functional lead 40C.

[0074] Step 8: Coating a transparent insulating protective ink or varnish on the surface layer 1 and drying it to form a protective layer 8, wherein the protective layer 8 completely covers the pattern layer 2, the electrode layer 3, the graphene heating layer 4, the capacitive touch layer 5, the pressure layer 6 and the second control electrode layer 7;

[0075] Step nine: The multifunctional PTC graphene heating skin that has completed the above process is cut by die-cutting to form a product.

[0076] Furthermore, the shape of the capacitive touch contact 30A in step five may be a combination of a circle and a polygon or a combination thereof.

[0077] Furthermore, the pressure range of the pressure ink in step seven is 100g to 2000g.

[0078] Furthermore, the capacitive touch layer 5 in step five and the pressure layer 6 in step six are electrically isolated from each other, with a distance greater than 1 mm.

[0079] Furthermore, the graphene ink material in step 4 is formed by adding graphene powder to a high molecular weight resin.

[0080] Furthermore, the graphene ink material in step 4 has PTC characteristics and can control the temperature independently.

[0081] It should be noted that the present invention can be applied to automotive interiors, such as door panels, dashboards, center armrests, ceilings, seats, and other areas, and can provide both hard and soft coatings. It should be understood that this multifunctional skin is not limited to automotive interiors but can also be applied in other fields.

Claims

1. A multifunctional PTC graphene heating skin, comprising a surface layer, a pattern layer, an electrode layer, a graphene heating layer, a capacitive touch layer, a pressure layer, a second control electrode layer, and a protective layer; The pattern layer is attached to the surface layer, and the pattern layer includes a light-shielding area and a light-transmitting area, wherein the shape of the light-transmitting area is the pattern on the pattern layer, and the pattern includes a heating downshift pattern, three gear position indication patterns, and a heating upshift pattern; The electrode layer is coated on the light-shielding area of ​​the pattern layer, and includes a heating electrode and a first control electrode, wherein the first control electrode includes two annular pressure contact first electrodes with notches, a ground wire group surrounding the pressure contact first electrodes, and a capacitor functional lead and a pressure contact second electrode functional lead corresponding to the pressure contact first electrodes are further provided within the surrounding range of the ground wire group, wherein one pressure contact first electrode surrounds a heating downshift pattern, and the other pressure contact first electrode surrounds a heating upshift pattern, and the two ends of the ground wire group, the capacitor functional lead, and the pressure contact second electrode functional lead are led out in a wiring manner; the heating electrode includes a heating electrode positive main line and a plurality of heating electrode positive branch lines led out therefrom, a heating electrode negative main line and a plurality of heating electrode negative branch lines led out therefrom, and the heating electrode positive branch lines and the heating electrode negative branch lines are arranged alternately; The graphene heating layer is coated on the area where the heating electrode is located on the light-shielding area of ​​the pattern layer; The capacitive touch layer is printed on the pattern layer and includes capacitive touch contacts and capacitive touch contact leads, wherein the capacitive touch contacts are respectively arranged within the range surrounded by the first electrodes of the two pressure contacts and correspondingly cover the heating downshift pattern and the heating upshift pattern, and the capacitive touch contact leads are led out from the notch and combined with the capacitive function leads; The pressure layer is printed on the light-shielding area of ​​the pattern layer and the electrode layer, and includes a ring-shaped pressure contact with a notch. The pressure contact has the same pattern as the first pressure contact electrode and completely covers the first pressure contact electrode in a non-overlapping manner. The second control electrode layer is printed on the pressure layer and includes a ring-shaped pressure contact second electrode with a notch and a pressure contact second electrode lead wire, wherein the pressure contact second electrode is completely placed on the pressure contact, and the pattern size of the pressure contact second electrode is exactly the same as that of the pressure contact first electrode, and is symmetrically arranged on both sides of the pressure contact. The pressure contact second electrode lead wire is connected to the pressure contact second electrode functional lead wire; The protective layer is coated on the surface layer, completely covering the pattern layer, the electrode layer, the graphene heating layer, the capacitive touch layer, the pressure layer and the second control electrode layer; The ground wire group is functional ground I, functional ground II, and shielding ground I from the inside to the outside. The first electrode of the pressure contact is connected to the functional ground I and functional ground II through the lead wires of the first electrode of the pressure contact. The middle part of the shielding ground I is connected to the cable through two leads.

2. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The electrode layer and the second control electrode layer are both made of metal silver.

3. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The material of the pressure layer is pressure ink, and the pressure range is 100g~2000g.

4. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The material of the capacitive touch layer is capacitive ink, and the capacitive touch layer must be electrically isolated from the pressure layer, with a distance greater than 1 mm.

5. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The material of the surface layer is selected from any one of PET, PVC, PP, PI, PU, ​​TPU, PUR, TPO, PC, PMMA and ABS, and the thickness is 0.05mm~5mm.

6. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The capacitive touch contact may be in a shape of a circle or a polygon or a combination thereof.

7. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The protective layer is a transparent insulating protective ink layer or a varnish layer.

8. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The capacitive touch layer has a light transmittance greater than 90%.

9. The multifunctional PTC graphene heating skin according to claim 1, characterized in that: The light transmittance of the surface layer is greater than 90%.

10. A method for preparing a multifunctional PTC graphene heating skin, for preparing the multifunctional PTC graphene heating skin according to claim 1, characterized in that: The method comprises the following steps: Step 1: Curing the surface layer, wherein the surface layer is selected from any one of PET, PVC, PP, PI, PU, ​​TPU, PUR, TPO, PC, PMMA and ABS with good light transmittance, and the thickness is 0.05mm~5mm; Step 2: A pattern layer is provided on the surface layer by any method of printing, hot stamping, or transfer printing, wherein the pattern layer includes a light-shielding area and a light-transmitting area, wherein the light-transmitting area has no printed material and the light-shielding area is printed with a light-shielding material, and the shape of the light-transmitting area is the pattern on the pattern layer, and the pattern includes a heated downshift pattern, three gear position indication patterns, and a heated upshift pattern; Step 3: Applying a low-temperature curing, low-square-resistance, stretchable conductive silver paste on the light-shielding area of ​​the pattern layer, and curing to form an electrode layer; wherein the electrode layer includes a heating electrode and a first control electrode; The first control electrode includes two annular pressure contact first electrodes with notches, a ground wire group surrounding the pressure contact first electrodes, and a capacitor functional lead and a pressure contact second electrode functional lead corresponding to the pressure contact first electrodes are further provided within the surrounding range of the ground wire group. One of the pressure contact first electrodes surrounds a heating downshift pattern, and the other pressure contact first electrode surrounds a heating upshift pattern. The two ends of the ground wire group, the capacitor functional lead, and the pressure contact second electrode functional lead are led out in a wire arrangement. The hot electrode includes a heating electrode positive main line and a plurality of heating electrode positive branch lines led out therefrom, a heating electrode negative main line and a plurality of heating electrode negative branch lines led out therefrom, and the heating electrode positive branch lines and the heating electrode negative branch lines are arranged alternately. Step 4: Printing graphene ink on the area where the heating electrode is located on the light-shielding area of ​​the pattern layer, and forming a graphene heating layer after drying; Step 5: Printing capacitive ink on the first control electrode area on the light-shielding area of ​​the pattern layer, and forming a capacitive touch layer after drying. The capacitive touch layer includes capacitive touch contacts and capacitive touch contact leads. The capacitive touch contacts are respectively arranged within the range surrounded by the two pressure contact first electrodes and correspondingly cover the heating downshift pattern and the heating upshift pattern. The capacitive touch contact leads are led out from the notch and combined with the capacitive function leads. Step 6: Printing and drying pressure ink on the light-shielding area of ​​the pattern layer and the electrode layer to form a pressure layer, wherein the pressure layer includes an annular pressure contact with a notch, and the pressure contact has the same pattern as the first pressure contact electrode and completely covers the first pressure contact electrode in a non-overlapping manner; Step 7: Applying a low-temperature curing, low-square-resistance, stretchable conductive silver paste on the pressure layer to form a second control electrode layer after curing. The second control electrode layer includes a ring-shaped, notched pressure contact second electrode and a pressure contact second electrode lead wire. The pressure contact second electrode is completely placed on the pressure contact. The pattern size of the pressure contact second electrode is exactly the same as that of the pressure contact first electrode and is symmetrically arranged on both sides of the pressure contact. The pressure contact second electrode lead wire is connected to the pressure contact second electrode functional lead wire. Step 8: Coating a transparent insulating protective ink or varnish on the surface layer and drying it to form a protective layer, which completely covers the pattern layer, electrode layer, graphene heating layer, capacitive touch layer, pressure layer and second control electrode layer; Step nine: The multifunctional PTC graphene heating skin completed in step eight is cut by die-cutting to form a product.

11. The method for preparing the multifunctional PTC graphene heating skin according to claim 10, characterized in that: The shape of the capacitive touch contact in step five can be a combination of one or more of a circle and a polygon.

12. The method for preparing the multifunctional PTC graphene heating skin according to claim 10, characterized in that: The pressure range of the pressure ink in step 6 is 100g~2000g.

13. The method for preparing the multifunctional PTC graphene heating skin according to claim 10, characterized in that: The capacitive touch layer in step five and the pressure layer in step six are electrically isolated from each other, with a distance greater than 1 mm.

14. The method for preparing the multifunctional PTC graphene heating skin according to claim 10, characterized in that: The graphene ink material in step 4 is formed by adding graphene powder to a high molecular weight resin.

15. The method for preparing the multifunctional PTC graphene heating skin according to claim 10, characterized in that: The graphene ink material described in step 4 has PTC characteristics and can control the temperature by itself.

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