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Graphene electrothermal film with adjustable infrared emissivity and preparation method thereof

An infrared emissivity, graphene film technology, applied in electric heating devices, ohmic resistance heating, electrical components and other directions, can solve the problems of cumbersome, graphene structure damage, complex reagents or operation steps, etc., to achieve simple operation and easy availability of raw materials , the effect of easy promotion

Pending Publication Date: 2022-07-08
南通国峰新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are usually cumbersome, requiring complex and expensive reagents or operating steps, and causing damage to the structure of graphene itself
Moreover, these methods are usually difficult to achieve precise adjustment and reversible adjustment of infrared emissivity

Method used

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  • Graphene electrothermal film with adjustable infrared emissivity and preparation method thereof
  • Graphene electrothermal film with adjustable infrared emissivity and preparation method thereof
  • Graphene electrothermal film with adjustable infrared emissivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Select a polyimide film as the carbon-containing substrate, and expose the polyimide film with a thickness of 150 μm to CO at a wavelength of 10.6 μm 2 Under the laser, the laser parameters are the power of 5W, the scanning line spacing is 100 μm, the laser spot size is 1 mm, and the laser scanning speed is 200 mm / s, and the graphene film can be obtained.

[0036] (2) A polyethylene terephthalate (PET) film was selected as an elastic flexible substrate, and a layer of hot melt adhesive was uniformly coated on the surface of the PET film by a thermal coating method.

[0037] (3) After the PET film is lowered to room temperature, the hot-melt adhesive layer of the PET film and the graphene film are put into the roller mold, and a pressure of 1Mpa is applied to the material at 120°C, and the two are rolled at a rolling speed of 0.125mm / s. Then, the composite film was hot-pressed to obtain a PET-graphene composite film.

[0038] (4) The residual polyimide on the surfac...

Embodiment 2

[0042] The elastic flexible substrate selected in the graphene preparation method in this embodiment is a polytetrafluoroethylene (PTFE) fiber cloth, and other conditions are the same as those in Embodiment 1.

[0043] The best emission band of thermal radiation of the graphene heating element prepared in this example is 8-16 μm, and the infrared emissivity is 0.95.

Embodiment 3

[0045] (1) Select a polyimide film as the carbon-containing substrate, and expose the polyimide film with a thickness of 150 μm to CO at a wavelength of 10.6 μm 2 Under the laser, the laser parameters are the power of 5W, the pulse frequency of 20kHz, the laser scanning speed of 200mm / s, and the scanning spacing of 10μm, and the graphene film can be obtained.

[0046] (2) Select polytetrafluoroethylene (PTFE) fiber cloth as the elastic and flexible substrate, and uniformly coat a layer of heat-resistant epoxy glue on the surface of the PTFE fiber cloth.

[0047] (3) put the silica gel layer and the graphene film of the PTFE fiber cloth into the roller mold, apply a pressure of 5Mpa to the material at room temperature, and compound the two by cold pressing at a rolling speed of 0.125mm / s to obtain PTFE-graphene composite film.

[0048] (4) The residual polyimide on the surface of the PTFE-graphene composite film is peeled off by a mechanical peeling method to obtain a graphene...

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Abstract

The invention discloses a graphene electrothermal film with adjustable infrared emissivity and a preparation method thereof, and relates to the technical field of intelligent thermal control. The graphene electrothermal film is composed of an elastic flexible substrate and a periodic graphene circuit located on the elastic flexible substrate; the spacing of the periodic graphene circuits is changed by mechanically stretching or curling the graphene electrothermal film, so that the controllable adjustment of the infrared emissivity is realized; according to the graphene preparation method, high-quality graphene can be obtained in batches, the prepared graphene electrothermal film has the advantages of being elastic, flexible and easy to bend, the infrared emissivity can be continuously and controllably adjusted within the range of 0.1-0.9, and the preparation method has the advantages that operation is easy, raw materials are easy to obtain, and popularization is easy.

Description

Technical field: [0001] The invention relates to the technical field of intelligent thermal control, in particular to a graphene electrothermal film with adjustable infrared emissivity and a preparation method thereof. Background technique: [0002] All substances with a temperature above absolute zero emit infrared waves, the intensity of which depends on the temperature (T) and infrared emissivity (ε) of the surface material. Infrared emission is currently widely used in intelligent thermal control, infrared stealth, health physiotherapy and many other fields. Since the thermal cycle is usually slow, simple temperature control can no longer meet the needs of infrared emission performance regulation. Therefore, the controllable adjustment of infrared emissivity (ε) is of great significance in practical applications. In recent years, it has been found that infrared emissivity can be modulated in situ through the design of surface structure, control of carrier density, or p...

Claims

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Application Information

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IPC IPC(8): H05B3/14H05B3/34
CPCH05B3/145H05B3/34Y02B30/00
Inventor 李年王振洋李钊张淑东刘翠
Owner 南通国峰新材料科技有限公司