阅读说明：本技术 一种高导热、高导电磺化石墨烯基复合薄膜及其制备方法 (High-thermal-conductivity and high-electric-conductivity sulfonated graphene-based composite film and preparation method thereof ) 是由 李周芊芊 蒋尧如 李伟 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种高导热、高导电磺化石墨烯基复合薄膜及其制备方法,该方法是将含羟基或氨基的水溶性聚合物和磺化石墨烯溶解分散至水中形成浆料,将浆料涂布在基带上,依次经过干燥脱水、交联固化及剥离后,置于保护气氛下,进行炭化处理和石墨化处理,即得磺化石墨烯基复合薄膜。该方法利用磺化石墨烯和含羟基或氨基的水溶性聚合物通过交联反应,从而保证了在炭化和石墨化过程中形成少缺陷、少微孔,且具有柔韧性的高导热、高导电磺化石墨烯基复合薄膜,可以广泛应用于电子产品、传感器、触摸屏及金属表面以达到快速导电、散热的效果。该方法原材料成本低、污染少,易于工业化生产。(The invention discloses a high-thermal-conductivity and high-electric-conductivity sulfonated graphene-based composite film and a preparation method thereof. According to the method, sulfonated graphene and water-soluble polymers containing hydroxyl or amino are subjected to a cross-linking reaction, so that the sulfonated graphene-based composite film which has few defects, few micropores and high flexibility, is high in heat conductivity and can be formed in carbonization and graphitization processes, and can be widely applied to electronic products, sensors, touch screens and metal surfaces to achieve the effects of rapid electric conductivity and heat dissipation. The method has low cost of raw materials, less pollution and easy industrial production.)

1. A preparation method of a sulfonated graphene-based composite film with high thermal and electrical conductivity is characterized by comprising the following steps: dissolving and dispersing a water-soluble polymer containing hydroxyl and/or amino and sulfonated graphene into water to form slurry, coating the slurry on a base band, and sequentially drying, dehydrating, crosslinking, curing and stripping to obtain a sulfonated graphene/polymer film; and (3) placing the sulfonated graphene/polymer film in a protective atmosphere, and performing carbonization treatment and graphitization treatment to obtain the sulfonated graphene-based composite film.

2. The preparation method of the sulfonated graphene-based composite film with high thermal and electrical conductivity according to claim 1, wherein the preparation method comprises the following steps: the mass percentage content of sulfur in the sulfonated graphene is 2-20%, and the sulfur in the sulfonated graphene is uniformly distributed in a two-dimensional plane.

3. The preparation method of the sulfonated graphene-based composite film with high thermal and electrical conductivity according to claim 1, wherein the preparation method comprises the following steps: the mass ratio of the sulfonated graphene to the water-soluble polymer containing hydroxyl and/or amino to water is 100: 10-100: 500-5000.

4. The preparation method of the sulfonated graphene-based composite film with high thermal and electrical conductivity according to claim 1 or 3, wherein the preparation method comprises the following steps: the water-soluble polymer containing hydroxyl and/or amino is at least one of polyvinyl alcohol, hydroxyethyl cellulose, hydroxymethyl cellulose, polyacrylamide and polyacrylic acid.

5. The preparation method of the sulfonated graphene-based composite film with high thermal and electrical conductivity according to claim 1, wherein the preparation method comprises the following steps: the conditions for crosslinking and curing are as follows: preserving the heat for 1-5 h at 80-120 ℃.

6. The preparation method of the sulfonated graphene-based composite film with high thermal and electrical conductivity according to claim 1, wherein the preparation method comprises the following steps: the carbonization treatment conditions are as follows: heating to 800-1200 ℃ at a speed of 2-10 ℃/min, and preserving heat for 1-2 h.

7. The preparation method of the sulfonated graphene-based composite film with high thermal and electrical conductivity according to claim 1, wherein the preparation method comprises the following steps: the graphitization treatment conditions are as follows: and preserving heat for 1-2 h at the temperature of 2600-3000 ℃.

8. A high heat conduction, electric conduction sulfonated graphene-based composite film is characterized in that: the preparation method of any one of claims 1 to 7.

Technical Field

The invention relates to a heat-conducting and electric-conducting composite material, in particular to a high-heat-conducting and electric-conducting sulfonated graphene-based composite film and a preparation method thereof, and belongs to the technical field of new heat-conducting and heat-dissipating materials.

Background

The graphene film with high thermal conductivity is a novel heat-conducting and heat-dissipating material widely researched in recent years, and due to the ultrahigh thermal conductivity coefficient, the graphene film can be widely applied to many fields such as electronics, communication, aviation, national defense and military industry and the like. Particularly, the development of the 5G technology puts higher requirements on heat conduction materials, and many enterprises urgently need to develop a new generation of heat conduction film materials to adapt to a new generation of rapidly-developed communication technology. The graphene heat-conducting film has high heat conductivity coefficient and low thermal resistance, and meanwhile, the surface of the graphene heat-conducting film can be compounded with other materials such as metal, resin and ceramic to meet various functional requirements, and can be cut and tailored according to actual needs.

The low-dimensional carbon nano material (graphene, carbon nano tube and the like) has extremely high elastic constant and mean free path, and the thermal conductivity can reach 3000-6000 W.m^-1·K^-1. According to the traditional graphene heat-conducting film, graphite powder, mixed strong acid, water and the like are prepared into slurry through an oxidation-reduction method, the slurry is coated to form a film, and then sintering and high-temperature reduction are carried out to prepare the obtained graphene heat-conducting film. Moreover, the traditional graphene conductive film is complex in preparation process and difficult to form, although the product has good heat conductivity coefficient, the prepared film is thick and poor in flexibility, the thick heat-conducting film material occupies too much space in an electronic product, the structural design of the product is directly influenced, and the design requirement of the electronic product can not be well met.

At present, due to the rapid development of microelectronic integration technology and high-density printed board assembly technology, the assembly density is rapidly increased, the volumes of electronic components and logic circuits are gradually reduced, and electronic products are rapidly promoted towards the trend of being light, thin, short and small. The high-frequency working frequency causes the temperature of the semiconductor working environment to rise rapidly, and heat generated by electronic components is gradually accumulated and the temperature rises continuously. In order to ensure that the electronic components can work normally with high reliability under the temperature of the service environment, the heat dissipation is timely and fast to become a key factor influencing the service life of the electronic components. Therefore, when the graphene-based heat and electricity conducting film is used, higher requirements are put on the heat and electricity conductivity of the film.

Disclosure of Invention

Detailed Description

The following examples are further illustrative of the present invention and are not intended to limit the scope of the claims.