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Multifunctional graphene electrothermal paste, multifunctional electrothermal film prepared by same, preparation method and application

A graphene, multi-functional technology, used in electric heating devices, ohmic resistance heating, heating element materials, etc., can solve the comparison of electrical conductivity and heat transfer performance, the lack of surface pretreatment of base materials, and the lack of surface properties of slurry carrier substrates. concerns, etc.

Active Publication Date: 2018-02-09
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the crystal structure of graphene oxide has been destroyed by a strong oxidant during the preparation stage, the electrical conductivity and heat transfer performance cannot be compared with that of intrinsic graphene, and its crystal structure needs to be restored through chemical reduction, which will lengthen the life of electrothermal paste and its film products. Process route, increase energy consumption and cost
Although Chinese patents CN 106304435 A, CN 105884251 A, CN 105898906 A, etc. have used such as mechanically exfoliated graphene as conductive heating materials, the preparation process is to mix graphene raw materials with various additives and auxiliary agents in mechanical liquid phase, Relying on mechanical shear force for stirring and dispersing, the core heating material graphene and various fillers largely rely on physical adsorption and wrapping, lacking the combination of chemical bond scales, and the active ingredients are prone to segregation during subsequent storage and use. After the device is easy to cause local overheating, forming a safety hazard
In addition, the existing patented technologies all focus on the preparation of electrothermal slurry and related processes, lack of attention to the surface properties of the slurry carrier substrate, and fail to effectively pretreat the surface of the substrate material to enhance the bonding force of the slurry / substrate interface. Especially for flexible electrothermal devices, which will face different degrees of bending during installation and use, the interface bonding force between the slurry and the substrate is a key factor determining its service life and safety

Method used

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  • Multifunctional graphene electrothermal paste, multifunctional electrothermal film prepared by same, preparation method and application
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  • Multifunctional graphene electrothermal paste, multifunctional electrothermal film prepared by same, preparation method and application

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Effect test

Embodiment 1

[0081] Graphene powder is prepared by electrochemical exfoliation method. The thickness of graphene is 0.5-3 nm, the lateral size is about 30-50 μm, and the crystal structure is complete. See the attached figure 1 (a), with figure 2 (a), the graphene microsheets are soft and transparent, and the crystal form is well maintained. Take 1 part by mass of graphene powder, disperse it in deionized water, the concentration of the dispersion is 0.5 mg / mL, add sodium lauryl sulfate as a hydrophilic agent (physical modifier), and disperse by ultrasonic vibration for 60 minutes.

[0082] Add 1 mass part of methylenebisacrylamide, 1 mass part of polyacrylic acid as a reaction emulsion, a total of 0.5 mass parts of additives, including 0.1 mass part of polyoxyethylene ether methacrylate (dispersant), 0.1 mass part Parts by mass of lauryl alcohol ester (film-forming aid), 0.05 parts by mass of potassium sorbate (preservative), 0.05 parts by mass of silicone oil (defoamer), 0.1 parts by ma...

Embodiment 2

[0086]Graphene powder is prepared by electrochemical exfoliation method. The thickness of graphene is 1-5 nm, the lateral size is about 2-10 μm, and the crystal structure is complete. Take 5 parts by mass of graphene powder and disperse it in the ethanol / water mixed solution. The concentration of the dispersion is 5 mg / mL. Add 3 parts by mass of potassium permanganate as an oxidant to introduce functional groups such as hydroxyl and carboxyl. After washing, hexamethylene diisocyanate is added to react with carboxyl or hydroxyl groups on the graphene microsheets to form amide bonds or carbamate bonds to activate graphene, and disperse by ultrasonic vibration.

[0087] Add 2 parts by mass of acrylic acid to the dispersion, 2 parts by mass of polyurethane as a reaction emulsion, a total of 2 parts by mass of additives, including 0.5 parts by mass of polyoxypropylene ether acrylate (dispersant), 0.5 parts by mass of propylene glycol methyl ether acetate ( film-forming aid), 0.5 pa...

Embodiment 3

[0091] The graphene powder was prepared by electrochemical exfoliation method, the thickness of graphene is 3-5 nm, and the lateral dimension is about 0.3-5 μm. figure 1 (b), with figure 2 (b), graphene microsheets have small lateral dimensions, complete crystal structure, and excellent conductivity. Take 10 parts by mass of graphene powder, add part of concentrated nitric acid for pre-oxidation, and introduce functional groups such as hydroxyl and carboxyl. After washing, γ-methacryloxypropyltrimethoxysilane was added to react with the hydroxyl groups on the graphene microchips, and then it was stably dispersed in the N,N-dimethylformamide / water mixture, and the concentration of the dispersion was 10 mg / mL.

[0092] Add 5 parts by mass of acrylic resin, 5 parts by mass of ammonia water as a reaction emulsion, a total of 5 parts by mass of additives, including 0.5 parts by mass of polyoxyethylene ether acrylate (dispersant), 0.5 parts by mass of propylene glycol butyl ether...

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Abstract

The present invention discloses multifunctional graphene electrothermal paste, a multifunctional electrothermal film prepared by the same, a preparation method and application. The preparation methodcomprises the following steps that: (1) graphene nanoplatelets are modified by introducing inducible lipidation and cross-linking reaction groups; (2) the modified graphene, a lipidizable and cross-linking reaction emulsion and various kinds of additives are subjected to liquid phase mixing, the above dispersion liquid is induced to undergo in-situ esterification and cross-linking reaction, so that graphene-based homogeneous electrothermal paste can be formed; (3) an electrothermal paste loading matrix is modified, so that the interfacial property of the electrothermal paste and the matrix material can be enhanced; and (4) the graphene electrothermal paste can be combined with different base materials, so that electrothermal products can be prepared. The graphene electrothermal material ofthe invention has the advantages of adjustable resistivity, adjustable use voltage, adjustable heating efficiency, far infrared heating function, flame retardancy, wide application range, high safety, energy-saving performance and the like, and can be applied to home building material manufacturing, human body care, aviation equipment, medical equipment, transportation pipelines, automobiles andother fields.

Description

technical field [0001] The invention relates to a multifunctional graphene electrothermal slurry, a multifunctional electrothermal film made thereof, a preparation method and an application thereof, and belongs to the field of electrothermal materials. Background technique [0002] my country's air pollution is mainly coal smoke pollution. In recent years, the country's coal consumption, especially the amount of coal used for heating in winter, has remained high. The implementation of electric heating technology that saves land, is beneficial to environmental protection, is safe and reliable, and is easy to charge has obvious advantages in terms of energy saving, maintenance costs and management expenses. Electrothermal film is a self-heating film material after electrification. It is composed of special ink that can conduct heat and heat, metal current-carrying bar, base material, protective layer, temperature control, sensor and other parts. It is used in building heating ...

Claims

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Application Information

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IPC IPC(8): H05B3/14H05B3/20
CPCH05B3/145H05B3/20Y02P20/10
Inventor 王俊中王聪伟
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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