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Self-heating film based on graphene fiber nonwovens

A graphene fiber, non-woven technology, applied in the direction of fiber chemical characteristics, wet spinning, non-woven fabrics, etc., can solve the problems of low saturation temperature, slow heating speed, and high working voltage, and achieve high saturation temperature, temperature rise and The effect of fast cooling rate and high saturation temperature

Active Publication Date: 2016-12-07
杭州德烯科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a self-heating film based on graphene fiber non-woven fabric in view of the shortcomings of current graphene electrothermal film materials such as high working voltage, slow heating speed, and low saturation temperature. The layer material has the advantage of high conductivity and low density, so it can quickly heat up at a low operating voltage and reach a high saturation temperature

Method used

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  • Self-heating film based on graphene fiber nonwovens
  • Self-heating film based on graphene fiber nonwovens
  • Self-heating film based on graphene fiber nonwovens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) A graphene oxide dispersion liquid with a concentration of 5 mg / mL is prepared, and the solvent is N, N-dimethylformamide, and it is used as a spinning solution.

[0030] (2) Make the spinning solution enter the ethyl acetate rotating coagulation solution through a spinning tube with a diameter of 130 μm at an extrusion speed of 0.04 mL / min, soak in the coagulation solution for 30 minutes, and solidify into graphene oxide short fibers with a length of more than 2 mm , collected by vacuum filtration, placed at room temperature for 10 h, and vacuum-dried at 60° C. for 3 h to obtain a film composed of graphene oxide fibers.

[0031] (3) the film obtained in step 2 is redispersed in water and ethanol in the mixed solution formed by the volume ratio shown in Table 1 to obtain the suspension of graphene oxide fiber, which is filtered and deposited through a filter screen, and graphite oxide is obtained on the filter screen Graphene oxide fiber non-woven fabric; the graphe...

Embodiment 2

[0039] (1) A graphene oxide dispersion liquid with a concentration of 5 mg / mL is prepared, and the solvent is N, N-dimethylformamide, and it is used as a spinning solution.

[0040] (2) Let the spinning liquid enter the ethyl acetate rotating coagulation liquid through a spinning tube with a diameter of 200 μm at an extrusion speed of 0.06 mL / min, soak in the coagulation liquid for 30 minutes, collect it by vacuum filtration, place it at room temperature for 10 hours, and vacuum at 60 ° C. Dry for 3 hours to obtain a film composed of graphene oxide fibers.

[0041](3) redisperse the film obtained in step 2 in water and ethanol in a mixed solution of 3:1 by volume to obtain a suspension of graphene oxide fibers, filter and deposit through a filter screen, and obtain graphene oxide fibers without Woven fabric; the graphene oxide fiber non-woven fabric was washed three times with ethanol and dried at 80°C.

[0042] (4) The graphene oxide fiber non-woven fabric after drying is ob...

Embodiment 3

[0047] Steps 1-5 are the same as in Example 1.

[0048] (6) Paste the 2V solar cells encapsulated in the polymer film on the surface of the graphene fiber non-woven fabric, and connect the electrodes of the photovoltaic film and the non-woven fabric with wires, and install a switch on one side of the circuit, thus obtaining a flexible self- hot film.

[0049] After the above steps, the heating temperature of the obtained self-heating film is 50°C, and the heating rate is 55°Cs when the power is turned on. -1 , the cooling rate is 58℃s when the power is off -1 . When the self-heating film is bent, the heating temperature and rate remain unchanged.

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Abstract

The invention discloses a self-heating film based on graphene fiber nonwovens and a preparation method thereof. The self-heating film is provided with voltage and current by a photovoltaic film as an energy layer, and a heating layer is formed by using the electric-induced-heating effect of the graphene fiber nonwovens. The energy layer is separated from the heating layer by a thermal insulation material. As the graphene fiber nonwovens have a high electrical conductivity and a relatively low density, larger heating temperature and higher heating and cooling rates at a relatively low operating voltage can be obtained. Meanwhile, the graphene fiber nonwovens have high flexibility and structural stability, and the self-heating film is still able to show a stable heating behavior at bending state, so the self-heating film based on graphene fiber nonwovens can be used for novel wearable heating device using clean energy.

Description

technical field [0001] The invention relates to an electrothermal film, in particular to a self-heating film based on a graphene fiber non-woven fabric as a heating element. Background technique [0002] Electroheating is a phenomenon in which a conductor generates heat when an electric current passes through it, thereby converting electrical energy into internal energy of the conductor. The heat generated by the current follows Joule's law, that is, the heat is proportional to the square of the current, the resistance value and the electrification time (Q=I 2 Rt). In a purely resistive circuit, heat is proportional to the square of the applied voltage and inversely proportional to the resistance of the conductor (Q=(U 2 / R)t). The electrothermal material made of carbon material has excellent properties such as high electrothermal conversion efficiency and long service life, and can emit far-infrared radiation that is beneficial to the human body. Therefore, compared wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B33/00B32B3/08D01F9/12D04H3/002D01D5/06
CPCD01D5/06D01F9/12D04H3/002B32B3/08B32B5/022B32B5/028B32B33/00B32B2307/30B32B2307/72B32B2262/106B32B2307/202
Inventor 高超李拯王然
Owner 杭州德烯科技集团有限公司
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