Graphene temperature-sensitive material, high-rate graphene self-temperature-control heating wire and preparation method and application of high-rate graphene self-temperature-control heating wire

Abstract

The invention provides a graphene temperature-sensitive material, a high-rate graphene self-temperature-control heating wire and a preparation method and application of the high-rate graphene self-temperature-control heating wire, and belongs to the technical field of heating wires. The graphene temperature-sensitive material is prepared from the graphene conductive powder, the crystalline polymer elastomer and the filler, then the graphene temperature-sensitive material is used as the heating layer, and the high-rate graphene self-temperature-control heating wire is prepared and applied to the automobile seat heating device. The meter resistance of the graphene self-temperature-control heating wire is 50-100 ohm / m, the electric heating power is automatically adjusted along with the change of the system temperature, the temperature change and overheating of the heating wire are compensated at any time, and self-control adjustment is achieved. The graphene self-temperature-control heating wire is fixed to the non-woven fabric in a wiring mode, the heating wire is made into the cushion in a terminal hitting mode, the compression strength of the product is 4000 v / 5 s, the leakage current is smaller than 0.5 mA / m, and the technical bottleneck of seat thermal runaway can be effectively solved when the product is applied to a new energy automobile seat.

Description

Technical Field

[0001] The present invention relates to the technical field of heating wires, and in particular to a graphene temperature-sensitive material, a high-rate graphene self-temperature-controlled heating wire, and a preparation method and application thereof. Background Art

[0002] As cars develop towards electrification and intelligence, consumers' demand for car comfort configuration increases, and car seat heating has become a necessity for many car owners. In the passenger car and commercial vehicle markets, the proportion of all models equipped with this feature is also gradually increasing, and the car seat heater market has become a hot spot.

[0003] Car seat heating pads consist of a heating pad and wiring harness, typically covering the backrest and seat cushion. Power is supplied by applying a 12-24V voltage. Currently, flame-retardant non-woven fabrics or cloth substrates are used, with copper-tin alloy heating wires used as the heating element. These wires are fixed to the non-woven fabric through designed wiring to generate heat. Traditional heating wires lack temperature control, and existing seat heating elements have only an NTC connected to the heating wire harness to collect temperature. Because new energy seat cushions are heated by the human body most of the time, localized overheating during knee pressure tests and jerking movements can generate high currents and cause fires, posing a safety hazard. Therefore, developing a safe and stable self-temperature-regulating heating wire is key to solving this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a graphene temperature-sensitive material, a high-rate graphene self-temperature-controlled heating wire, and a preparation method and application thereof, so as to solve the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a graphene temperature-sensitive material comprising the following components in parts by mass:

[0007] 10-40 parts of graphene conductive powder;

[0008] 30-200 parts of crystalline polymer elastomer;

[0009] 30-60 parts of filler;

[0010] The graphene conductive powder is obtained by modifying conductive powder.

[0011] Furthermore, the preparation method of the graphene conductive powder is as follows: dispersing the conductive powder in a solvent, then adding a modifier, and performing ultrasonic dispersion and freeze drying to obtain the graphene conductive powder;

[0012] The conductive powder comprises two or more of graphene, carbon black, SiC, carbon nanotubes and carbon fibers; the modifier comprises two or more of chitosan, coupling agent KH550, polyethylene glycol and polyvinyl alcohol;

[0013] The solvent is a mixture of ethanol and ethylene glycol.

[0014] Furthermore, the mass ratio of the conductive powder, the solvent and the modifier is 30-60:100-300:1-50.

[0015] Furthermore, the crystalline polymer elastomer comprises one or more of PVC, PP, PE, PVDF, TPU and silicone rubber;

[0016] The filler comprises one or more of Al2O3, ZnO and boron nitride.

[0017] The present invention also provides a method for preparing a graphene temperature-sensitive material, comprising the following steps:

[0018] Graphene conductive powder, crystalline polymer elastomer and filler are ball-milled and mixed, the resulting mixture is heated and melted, and when the powder becomes slightly cohesive, it is taken out, ball-milled again and sieved to obtain powder; the powder is melt-extruded and granulated to obtain graphene temperature-sensitive material.

[0019] Furthermore, the heating and melting temperature is 60 to 110°C;

[0020] The melt extrusion parameters are: screw speed 50-100 rpm, extrusion pressure 10-35 MPa, cutting speed 500-800 times / min, temperature controlled at 80-150° C., masterbatch size 5-8 mm long, and 2-5 mm in diameter.

[0021] The present invention also provides a high-rate graphene self-temperature-controlled heating wire, comprising two electrodes, a double-elliptical heating layer wrapped around the electrodes, and an insulating flame-retardant layer wrapped around the heating layer;

[0022] The heating layer is the above-mentioned graphene temperature-sensitive material.

[0023] The present invention also provides a method for preparing a high-rate graphene self-temperature-controlled heating wire, comprising the following steps:

[0024] Silver-plated copper wire is used as the electrode, which is unfolded through a wire pay-off frame, and the graphene temperature-sensitive material is melt-extruded through a double elliptical mold to be coated on the electrode to form a heating layer; an insulating flame-retardant layer is extruded outside the heating layer, and through electron irradiation cross-linking, water cooling and shaping, and winding, a high-rate graphene self-temperature-controlled heating wire is obtained.

[0025] Furthermore, the diameter of the silver-plated copper wire is 0.6-1.0 mm; the temperature of the melt extrusion is 120-150° C., and the thickness of the heating layer is 0.5-2 mm.

[0026] The present invention also provides an application of a high-rate graphene self-temperature-controlling heating wire in an automobile seat heating device.

[0027] Beneficial effects of the present invention:

[0028] The present invention effectively modifies and melt-coats graphene and temperature-sensitive polymers to form graphene temperature-sensitive materials (PTC temperature-sensitive materials). At the same time, in response to the requirements of low-voltage and high-current heating wires, silver-plated copper wire is used as a conductor (electrode), which greatly improves the overload current and prevents the risk of heat accumulation due to low overload current of the conductor. At the same time, the PTC temperature-sensitive material is melt-extruded in a double-parallel elliptical structure, which can effectively adjust the distance between the two electrodes. The outer layer is insulated and flame-retardantly wrapped with Teflon or silicone. The graphene self-controlling heating wire manufactured by the method of the present invention has a meter resistance of 100 to 200 ohms / meter, and the electric heating power is automatically adjusted with the change of system temperature, and the temperature change is compensated at any time. The heating wire overheats and achieves self-control adjustment. The graphene self-controlling heating wire is fixed on a non-woven fabric by wiring, and the heating wire is made into a seat cushion by a terminal punching mode. The product has a voltage resistance of 4000v / 5s and a leakage current of less than 0.5mA / m. It is applied to the seats of new energy vehicles and can effectively solve the technical bottleneck of seat thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the high-rate graphene self-temperature-controlled heating wire of the present invention. DETAILED DESCRIPTION

[0030] The present invention provides a graphene temperature-sensitive material comprising the following components in parts by mass:

[0031] 10-40 parts of graphene conductive powder;

[0032] 30-200 parts of crystalline polymer elastomer;

[0033] 30-60 parts of filler;

[0034] The graphene conductive powder is obtained by modifying conductive powder.

[0035] In the present invention, the content of the graphene conductive powder is preferably 12 to 30 parts by mass, and more preferably 15 to 25 parts by mass.

[0036] In the present invention, the content of the crystalline polymer elastomer is preferably 50 to 150 parts by mass, more preferably 80 to 120 parts by mass.

[0037] In the present invention, the content of the filler is preferably 35 to 55 parts by mass, more preferably 40 to 50 parts by mass.

[0038] In the present invention, the preparation method of the graphene conductive powder is as follows: the conductive powder is dispersed in a solvent, a modifier is added, and the graphene conductive powder is obtained by ultrasonic dispersion and freeze drying;

[0039] The conductive powder comprises two or more of graphene, carbon black, SiC, carbon nanotubes and carbon fibers; the modifier comprises two or more of chitosan, coupling agent KH550, polyethylene glycol and polyvinyl alcohol;

[0040] The solvent is a mixture of ethanol and ethylene glycol, and the mass ratio of the ethanol to ethylene glycol is 1 to 3:1, preferably 2:1.

[0041] In the present invention, the mass ratio of the conductive powder, solvent and modifier is 30-60:100-300:1-50, preferably 35-55:150-200:1.5-25, and more preferably 38-50:150-180:1.5-20.5.

[0042] In the present invention, the crystalline polymer elastomer comprises one or more of PVC, PP, PE, PVDF, TPU and silicone rubber, preferably one or more of PVC, PP, PE and PVDF;

[0043] The filler comprises one or more of Al2O3, ZnO and boron nitride, preferably ZnO and boron nitride.

[0044] The present invention also provides a method for preparing a graphene temperature-sensitive material, comprising the following steps:

[0045] Graphene conductive powder, crystalline polymer elastomer and filler are ball-milled and mixed, the resulting mixture is heated and melted, and when the powder becomes slightly cohesive, it is taken out, ball-milled again and sieved to obtain powder; the powder is melt-extruded and granulated to obtain graphene temperature-sensitive material.

[0046] In the present invention, the heating and melting temperature is 60 to 110°C, preferably 70 to 100°C, and more preferably 80 to 90°C;

[0047] The parameters of the melt extrusion are: screw speed 50-100 rpm, extrusion pressure 10-35 MPa, cutting speed 500-800 times / min, temperature controlled at 80-150°C, masterbatch size 5-8 mm long, and diameter 2-5 mm; preferably, screw speed 60-80 rpm, extrusion pressure 15-20 MPa, cutting speed 600-700 times / min, temperature controlled at 80-120°C, masterbatch size 6-7 mm long, and diameter 3-5 mm.

[0048] The present invention also provides a high-rate graphene self-temperature-controlled heating wire, comprising two electrodes, a double-elliptical heating layer wrapped around the electrodes, and an insulating flame-retardant layer wrapped around the heating layer;

[0049] The heating layer is the above-mentioned graphene temperature-sensitive material.

[0050] The present invention also provides a method for preparing a high-rate graphene self-temperature-controlled heating wire, comprising the following steps:

[0051] Silver-plated copper wire is used as the electrode, which is unfolded through a wire pay-off frame, and the graphene temperature-sensitive material is melt-extruded through a double elliptical mold to be coated on the electrode to form a heating layer; an insulating flame-retardant layer is extruded outside the heating layer, and through electron irradiation cross-linking, water cooling and shaping, and winding, a high-rate graphene self-temperature-controlled heating wire is obtained.

[0052] In this invention, silver-plated copper wire is used as the electrode, significantly increasing the overload current and preventing the risk of heat accumulation caused by low electrode overload current. The distance between the two electrodes can be effectively adjusted by varying the size of the elliptical double parallel wires. Teflon or silicone insulation and flame retardant wrapping are used to achieve the product's flame retardant and pressure-resistant properties.

[0053] In the present invention, the diameter of the silver-plated copper wire is 0.6-1.0 mm, preferably 0.7-0.9 mm; the temperature of the melt extrusion is 120-150°C, preferably 130-140°C, and more preferably 135°C; the thickness of the heating layer is 0.5-2 mm, preferably 1-1.5 mm.

[0054] The graphene self-controlling temperature heating wire of the present invention has a resistance of 50 to 100 ohms per meter, and the electric heating power is automatically adjusted as the system temperature changes, compensating for temperature changes at any time and preventing the heating wire from overheating, thereby achieving self-control regulation.

[0055] The present invention fixes the graphene self-temperature-controlling heating wire on the non-woven fabric by wiring, and makes the heating wire into a seat cushion by terminal punching. The product has a pressure resistance of 4000v / 5s and a leakage current of less than 0.5mA / m. It is used in the seats of new energy vehicles and can effectively solve the technical bottleneck of seat thermal runaway.

[0056] The present invention also provides an application of a high-rate graphene self-temperature-controlling heating wire in an automobile seat heating device.

[0057] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0058] Example 1

[0059] Take 100g of ethanol, 50g of ethylene glycol, 1g of chitosan, and 0.5g of KH550, disperse and stir evenly, add 15g of graphene powder, 15g of SiC, and 20g of carbon fiber into a dispersion barrel, perform 150W ultrasonic dispersion for 30min, and obtain graphene conductive powder after freeze-drying.

[0060] Weigh 30 g of graphene conductive powder, 100 g of PVC, 30 g of PVDF, 20 g of PE, and 30 g of ZnO, and mix the raw materials evenly at high speed through a ball mill at a speed of 1500 r / min. After mixing for 3 hours, bake at 90°C until the powder becomes slightly sticky. Take it out and ball mill it for 1 hour, then pass it through a 150-mesh sieve.

[0061] The powder was granulated by melt screw extrusion, using twin-screw extrusion granulation with a screw speed of 50 rpm, an extrusion pressure of 15 MPa, a sieve plate aperture of 1.0 mm, a cutting speed of 500 times / min, a temperature controlled at 150°C, a masterbatch size of 5 mm in length and 3 mm in diameter, to obtain a graphene thermosensitive material.

[0062] Silver-plated stranded copper wire is selected as the conductor. The diameter of the silver-plated copper wire is 0.6mm. The silver-plated copper strand is unfolded through a pay-off rack to ensure uniform tension. The graphene temperature-sensitive material is passed through a double elliptical parallel extrusion die through an extruder and a double elliptical grinding die to be coated on the conductive core to form a uniform heating layer. The extrusion temperature is 150°C and the thickness is controlled at 1mm. A Teflon insulation layer is extruded outside the heating layer, cross-linked by electron irradiation, and shaped by water cooling. The resistance is 80 ohms / m, 4000v / 5s, and the leakage current is less than 0.5mA / m. After passing the test, it is rolled up.

[0063] The power is measured by calculating the heat output, 24V is selected as the power supply voltage, the circuit is designed, and then the heating wire is fixed on the needle-punched cotton non-woven fabric through a wiring machine. By connecting the wiring harness, the product is temperature-controlled at 65-80℃.

[0064] Example 2

[0065] Take 150g of ethanol, 50g of ethylene glycol, 20g of PEG, and 0.5g of KH550, disperse and stir evenly, add 10g of graphene powder, 8g of carbon black, and 20g of carbon nanotubes into a dispersion barrel, perform ultrasonic dispersion at 200W for 30min, and obtain graphene conductive powder after freeze-drying.

[0066] Weigh 40 g of graphene conductive powder, 110 g of PP, 30 g of silicone rubber, 20 g of TPU, 20 g of Al2O3, and 10 g of boron nitride, and mix the raw materials evenly at high speed through ball milling at a speed of 1000 r / min. After mixing for 4 hours, bake them at 100°C until the powder becomes slightly bonded. Take them out and ball mill them for 3 hours, and then pass them through a 200-mesh sieve.

[0067] The powder was granulated by melt screw extrusion, using twin-screw extrusion granulation, with a screw speed of 80 rpm, an extrusion pressure of 20 MPa, a sieve plate aperture of 0.8 mm, a cutting speed of 800 times / min, a temperature controlled at 120 degrees, a masterbatch size of 8 mm in length and 2 mm in diameter, to obtain a graphene thermosensitive material.

[0068] Silver-plated stranded copper wire is selected as the conductor. The diameter of the silver-plated copper wire is 0.8mm. The silver-plated copper strand is unfolded through a pay-off rack to ensure uniform tension. The graphene temperature-sensitive material is passed through a double elliptical parallel extrusion die through an extruder and a double elliptical grinding die to be coated on the conductive core to form a uniform heating layer. The extrusion temperature is 130°C and the thickness is controlled at 1.5mm. A Teflon insulation layer is extruded outside the heating layer, cross-linked by electron irradiation, and shaped by water cooling. The resistance is 60 ohms / m, the insulation withstand voltage is 3000V, and the 0.5mA is qualified before being reeled.

[0069] The power is measured by calculating the heat output, 24V is selected as the power supply voltage, the circuit is designed, and then the heating wire is fixed on the needle-punched cotton non-woven fabric through a wiring machine. By connecting the wiring harness, the product is temperature-controlled at 65-80℃.

[0070] Example 3

[0071] Take 100g of ethanol, 100g of ethylene glycol, 1g of chitosan, 0.5g of KH550, and 10g of polyvinyl alcohol, disperse and stir evenly, add 15g of graphene powder, 5g of carbon black, 20g of carbon fiber, and 5g of carbon nanotubes into a dispersion barrel, perform 150W ultrasonic dispersion for 30min, and obtain graphene conductive powder after freeze-drying.

[0072] Weigh 25 g of graphene conductive powder, 100 g of PVC, 50 g of PVDF, 50 g of TPU, 30 g of ZnO, and 20 g of Al2O3, and mix the raw materials evenly at high speed through a ball mill at a speed of 1500 r / min. After mixing for 3 hours, bake at 90°C until the powder becomes slightly sticky. Take it out and ball mill it for 1 hour, then pass it through a 150-mesh sieve.

[0073] The powder was granulated by melt screw extrusion, using twin-screw extrusion granulation with a screw speed of 50 rpm, an extrusion pressure of 15 MPa, a sieve plate aperture of 1.0 mm, a cutting speed of 500 times / min, a temperature controlled at 150°C, a masterbatch size of 5 mm in length and 3 mm in diameter, to obtain a graphene thermosensitive material.

[0074] Silver-plated stranded copper wire is selected as the conductor. The diameter of the silver-plated copper wire is 0.6mm. The silver-plated copper strand is unfolded through a pay-off rack to ensure uniform tension. The graphene temperature-sensitive material is extruded through a double elliptical grinding die and coated on the conductive core to form a uniform heating layer. The extrusion temperature is 150°C and the thickness is controlled at 1mm. A Teflon insulation layer is extruded outside the heating layer, cross-linked by electron irradiation, and shaped by water cooling. The resistance is 100 ohms / m, 4000v / 5s, and the leakage current is less than 0.5mA / m. After passing the test, it is rolled up.

[0075] The power is measured by calculating the heat output, 24V is selected as the power supply voltage, the circuit is designed, and then the heating wire is fixed on the needle-punched cotton non-woven fabric through a wiring machine. By connecting the wiring harness, the product is temperature-controlled at 65-80℃.

[0076] Example 4

[0077] Take 100g of ethanol, 35g of ethylene glycol, 5g of chitosan, 0.5g of KH550, and 5g of polyethylene glycol, disperse and stir evenly, add 15g of graphene powder, 5g of carbon black, 5g of SiC, and 5g of carbon nanotubes into a dispersion barrel, perform 150W ultrasonic dispersion for 30min, and obtain graphene conductive powder after freeze-drying.

[0078] Weigh 25 g of graphene conductive powder, 100 g of PVC, 30 g of PVDF, 30 g of silicone rubber, 30 g of ZnO, 20 g of Al2O3, and 5 g of boron nitride, and mix the raw materials evenly at high speed through ball milling at a speed of 1500 r / min. After mixing for 3 hours, bake at 90°C until the powder becomes slightly sticky. Take it out and ball mill it for 1 hour, then pass it through a 150-mesh sieve.

[0079] The powder was granulated by melt screw extrusion, using twin-screw extrusion granulation with a screw speed of 50 rpm, an extrusion pressure of 15 MPa, a sieve plate aperture of 1.0 mm, a cutting speed of 500 times / min, a temperature controlled at 150°C, a masterbatch size of 5 mm in length and 3 mm in diameter, to obtain a graphene thermosensitive material.

[0080] Silver-plated stranded copper wire is selected as the conductor. The diameter of the silver-plated copper wire is 0.6mm. The silver-plated copper strand is unfolded through a pay-off rack to ensure uniform tension. The graphene temperature-sensitive material is passed through a double elliptical parallel extrusion die through an extruder and a double elliptical grinding die to be coated on the conductive core to form a uniform heating layer. The extrusion temperature is 150°C and the thickness is controlled at 1mm. A Teflon insulation layer is extruded outside the heating layer, cross-linked by electron irradiation, and shaped by water cooling. The resistance is 80 ohms / m, 4000v / 5s, and the leakage current is less than 0.5mA / m. After passing the test, it is rolled up.

[0081] The power is measured by calculating the heat output, 24V is selected as the power supply voltage, the circuit is designed, and then the heating wire is fixed on the needle-punched cotton non-woven fabric through a wiring machine. By connecting the wiring harness, the product is temperature-controlled at 65-80℃.

[0082] The performance of the high-rate graphene self-temperature-controlling heating wires obtained in Examples 1 to 4 was tested, and the results are shown in Table 1 below.

[0083] Table 1 Test results

[0084]

[0085] As can be seen from the above embodiments, the present invention provides a graphene temperature-sensitive material, a high-rate graphene self-controlling temperature heating wire, and its preparation method and application. The present invention uses graphene conductive powder, crystalline polymer elastomer and filler to prepare graphene temperature-sensitive material, and then uses the graphene temperature-sensitive material as a heating layer to prepare a high-rate graphene self-controlling temperature heating wire, which is applied to automobile seat heating devices. The graphene self-controlling temperature heating wire of the present invention has a resistance of 50 to 100 ohms / meter, and the electric heating power is automatically adjusted with the change of system temperature, compensating for temperature changes at any time, and overheating of the heating wire to achieve self-control regulation. The graphene self-controlling temperature heating wire is fixed on a non-woven fabric by wiring, and the heating wire is made into a seat cushion by a terminal punching mode. The product has a compressive strength of 4000v / 5s and a leakage current of less than 0.5mA / m. It is applied to the seats of new energy vehicles and can effectively solve the technical bottleneck of seat thermal runaway.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A graphene temperature-sensitive material, characterized in that: Contains the following components in parts by mass: 10-40 parts of graphene conductive powder; 30-200 parts of crystalline polymer elastomer; 30-60 parts of filler; The graphene conductive powder is obtained by modifying conductive powder.

2. The graphene temperature-sensitive material according to claim 1, characterized in that The preparation method of the graphene conductive powder comprises: dispersing the conductive powder in a solvent, adding a modifier, and performing ultrasonic dispersion and freeze drying to obtain the graphene conductive powder; The conductive powder comprises two or more of graphene, carbon black, SiC, carbon nanotubes and carbon fibers; the modifier comprises two or more of chitosan, coupling agent KH550, polyethylene glycol and polyvinyl alcohol; The solvent is a mixture of ethanol and ethylene glycol.

3. The graphene temperature-sensitive material according to claim 2, characterized in that The mass ratio of the conductive powder, the solvent and the modifier is 30-60:100-300:1-50.

4. The graphene temperature-sensitive material according to any one of claims 1 to 3, characterized in that: The crystalline polymer elastomer comprises one or more of PVC, PP, PE, PVDF, TPU and silicone rubber; The filler comprises one or more of Al2O3, ZnO and boron nitride.

5. The method for preparing the graphene temperature-sensitive material according to any one of claims 1 to 4, characterized in that: The following steps are involved: Graphene conductive powder, crystalline polymer elastomer and filler are ball-milled and mixed, the resulting mixture is heated and melted, and when the powder becomes slightly cohesive, it is taken out, ball-milled again and sieved to obtain powder; the powder is melt-extruded and granulated to obtain graphene temperature-sensitive material.

6. The method for preparing the graphene temperature-sensitive material according to claim 5, wherein: The heating and melting temperature is 60 to 110°C; The melt extrusion parameters are: screw speed 50-100 rpm, extrusion pressure 10-35 MPa, cutting speed 500-800 times / min, temperature controlled at 80-150° C., masterbatch size 5-8 mm long, and 2-5 mm in diameter.

7. A high-rate graphene self-temperature-controlled heating wire, characterized in that: It includes two electrodes, a double elliptical heating layer wrapped around the electrodes, and an insulating flame retardant layer wrapped around the heating layer; The heating layer is the graphene temperature-sensitive material according to any one of claims 1 to 3.

8. The method for preparing the high-rate graphene self-temperature-controlling heating wire according to claim 7, characterized in that: The following steps are involved: Silver-plated copper wire is used as the electrode, which is unfolded through a wire pay-off frame, and the graphene temperature-sensitive material is melt-extruded through a double elliptical mold to be coated on the electrode to form a heating layer; an insulating flame-retardant layer is extruded outside the heating layer, and through electron irradiation cross-linking, water cooling and shaping, and winding, a high-rate graphene self-temperature-controlled heating wire is obtained.

9. The method for preparing a high-rate graphene self-temperature-controlling heating wire according to claim 8, characterized in that: The diameter of the silver-plated copper wire is 0.6-1.0 mm; the temperature of the melt extrusion is 120-150° C., and the thickness of the heating layer is 0.5-2 mm.

10. Application of the high-rate graphene self-temperature-controlling heating wire according to claim 7 in a car seat heating device.

Images