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Nanocellulose graphene oxide electrothermal material and preparation method thereof

A technology of nanocellulose and electrothermal materials, applied in heating element materials, electrothermal devices, ohmic resistance heating, etc., can solve the problems of unfavorable working process stability, low degree of graphene dispersion, and inconspicuous space network skeleton structure, etc. Achieve the effect of improving density and moisture resistance stability, and enhancing work stability

Active Publication Date: 2021-06-11
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technical solution, when nanocellulose and graphene are blended, nanocellulose is equivalent to the skeleton tissue supporting graphene under the action of crosslinking, but there are the following problems in simply using nanocellulose as the skeleton tissue: the formation of nanocellulose The skeleton structure of the spatial network is not obvious, which leads to the low degree of dispersion of graphene in the nanocellulose skeleton structure, and also leads to the low uniformity of the film formed by the crosslinking and mixing of nanocellulose and graphene, which makes the prepared The thermal conductivity and stability of the electric heating film are not good enough
[0004] Similarly, the above-mentioned related research also has graphene with low dispersion degree, uneven temperature, easy water absorption and water seepage, which is not conducive to the stability of the working process.
In addition, the existing technologies are rarely applicable to the preparation of electrothermal materials on the surface of special-shaped substrates

Method used

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  • Nanocellulose graphene oxide electrothermal material and preparation method thereof
  • Nanocellulose graphene oxide electrothermal material and preparation method thereof
  • Nanocellulose graphene oxide electrothermal material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1. Select the substrate. After the substrate is dried by brushing the surfactant, spray paint on the surface of the substrate to form the first insulating layer. The coating amount is 100g / m 2 , and dried in a vacuum oven at 80°C for 5 hours.

[0052] Step 2: Adhere the copper foil to the insulating coating of the base to make electrodes; the distance and arrangement direction between the two electrodes are determined according to the effective heating area and the profile of the base.

[0053] Step 3: Weigh graphene, graphene oxide, and nanocellulose with a mass ratio of 0.5:0.25:0.25, i.e. graphene 5g, graphene oxide 2.5g, and nanocellulose 2.5g. The cellulose was mixed to form an aqueous dispersion with a concentration of 0.5 mg / ml, and the mixed system was obtained after ultrasonic dispersion at 800W power for 50 min.

[0054] Step 4, using the weighed graphene to prepare a graphene aqueous dispersion with a concentration of 0.5 mg / ml, and ultrasonically dispe...

Embodiment 2

[0061] Step 1. Select the substrate. After the substrate is dried by brushing the surfactant, spray paint on the surface of the substrate to form the first insulating layer. The coating amount is 100g / m 2 , and dried in a vacuum oven at 80°C for 5 hours.

[0062] Step 2: Adhere the copper foil to the insulating coating of the base to make electrodes; the distance and arrangement direction between the two electrodes are determined according to the effective heating area and the profile of the base.

[0063] Step 3, take graphene, graphene oxide, nanocellulose of 0.35:0.325:0.325 mass ratio, namely graphene 3.5g, graphene oxide 3.25g, nanocellulose 3.25g, the graphene oxide that weighs, The nanocellulose was mixed and configured to form an aqueous dispersion with a concentration of 0.5 mg / ml, and a mixed system was obtained after ultrasonic dispersion for 50 min at a power of 800 W.

[0064] Step 4, using the weighed graphene to prepare a graphene aqueous dispersion with a conc...

Embodiment 3

[0071] Step 1. Select the substrate. After the substrate is dried by brushing the surfactant, spray paint on the surface of the substrate to form the first insulating layer. The coating amount is 100g / m 2 , and dried in a vacuum oven at 80°C for 5 hours.

[0072] Step 2: Adhere the copper foil to the insulating coating of the base to make electrodes; the distance and arrangement direction between the two electrodes are determined according to the effective heating area and the profile of the base.

[0073] Step 3, take graphene, graphene oxide, nanocellulose of 0.55:0.225:0.225 mass ratio, namely graphene 5.5g, graphene oxide 2.25g, nanocellulose 2.25g, the graphene oxide that weighs, The nanocellulose was mixed and configured to form an aqueous dispersion with a concentration of 0.5 mg / ml, and a mixed system was obtained after ultrasonic dispersion for 50 min at a power of 800 W.

[0074] Step 4, using the weighed graphene to prepare a graphene aqueous dispersion with a conc...

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Abstract

The invention provides a nanocellulose graphene oxide electrothermal material and a preparation method thereof, comprising: a substrate; a heating layer formed on the substrate, wherein the heating layer contains graphene, graphene oxide, and nanocellulose; and connected to The electrodes of the heating layer. The preparation method includes selecting a substrate; spraying or brushing paint on the surface of the substrate to form a first insulating layer; mixing and dispersing nanocellulose and graphene oxide to obtain a mixed system; ultrasonically dispersing graphene and mixing the mixed system Mix and continue to ultrasonically disperse to obtain a composite dispersion system, and apply the composite dispersion system on the first insulating coating to form a heat-generating layer by inkjet printing or spraying or brushing to form a film; set electrodes to connect with the heat-generating layer; use paint spraying Alternatively, the nanocellulose graphene oxide electric heating material can be obtained after brushing on the heating layer to form a second insulating layer.

Description

technical field [0001] The invention relates to the field of nanocellulose electrothermal functional materials. More specifically, the present invention relates to a nano-cellulose graphene oxide electrothermal material with hydrophobicity, stable working temperature and uniform temperature distribution and a preparation method thereof. Background technique [0002] Graphene electrothermal materials have high electrothermal conversion efficiency and fast temperature rise response. They can be used in the fields of snow melting and deicing, defogging and defrosting, heating and heating, heating and heat preservation of microelectronic devices, and micro-area heating analysis. It is an important application of graphene. direction. At present, relevant research uses carbon fiber and slurry to compound to obtain a matrix material, and then mixes graphene and other additives to form a slurry that is attached to the matrix material according to a preset process, and a graphene el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/14
CPCH05B3/145
Inventor 袁全平邵闯李心璞苏初旺程芳超朱贞谕欧阳土龙
Owner GUANGXI UNIV
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