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Method for efficiently and continuously preparing heat-conducting graphite film on large area

A heat-conducting graphite film and graphene technology, applied in coatings, natural rubber coatings, conjugated diene coatings, etc., can solve the problem of poor mechanical properties and thermal conductivity of graphite films, no mention of calendering and process parameters, and impossibility Continuous large-area production and other issues, to achieve the effects of regular grain orientation, ultra-thin thickness, and overcoming high temperature and high energy consumption

Active Publication Date: 2015-12-02
SHANGHAI LEVSON ENTERPRISE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has certain advantages over the polymer film thermal decomposition method in terms of high temperature energy consumption and raw material cost, it still has complicated preparation steps and cannot be produced continuously in a large area. Disadvantages such as relatively poor thermal conductivity
The above-mentioned calendering is just ordinary calender calendering, and the above-mentioned patent does not mention how to calender and process parameters

Method used

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  • Method for efficiently and continuously preparing heat-conducting graphite film on large area

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 As shown, first weigh 1 kg of graphene powder (N008-P) with 5-8 layers of graphene, and disperse it into polytetrafluoroethylene emulsion to control the quality of graphene powder and polytetrafluoroethylene The mass ratio of the emulsion solute is 4:1, and it is refined by a refiner, and water can be added in the middle to adjust the viscosity of the slurry, and the viscosity is controlled to 6000mPa·s. Then pour the ground slurry into the low-level storage tank of the roller coating system, adjust the speed of the pressure pump to 50r / min, and adjust the speed of the electric roller coating wheel to 40r / min, so that the surface of the electric roller coating wheel is fully covered in the high-level liquid storage tank. Wetting, sticking the slurry, and then tearing off the single-sided release film to expose the base-loaded film (commercially available) of the adhesive layer is close to the roller coating wheel for roller coating operation. Pass the fil...

Embodiment 2

[0036] First take by weighing the graphene powder (N006-P) that the number of layers of 1kg is 3~5 layers of graphene, it is dispersed in the natural rubber emulsion, controls the mass ratio of graphene powder quality and natural rubber emulsion solute 9: 1. After being refined by a refiner, water can be added in the middle to adjust the viscosity of the slurry, and the viscosity is controlled to 4000mPa·s. Then pour the ground slurry into the low-level storage tank of the roller coating system, adjust the speed of the pressure pump to 60r / min, and adjust the speed of the electric roller coating wheel to 60r / min, so that the surface of the electric roller coating wheel is fully infiltrated in the high-level liquid storage tank , stick the size, and then tear off the single-sided release film to expose the base-loaded film (commercially available) of the adhesive layer close to the roller coating wheel for roller coating operation. Pass the film loaded with slurry through a hot...

Embodiment 3

[0038] First take by weighing the graphene powder (N002-PDR) of 1kg single-layer graphene, it is dispersed in the polyvinyl alcohol aqueous solution, the mass ratio of control graphene powder quality and polyvinyl alcohol aqueous solution solute 9.5:1, through The pulp is refined by a refiner, and water can be added in the middle to adjust the viscosity of the slurry, and the viscosity is controlled to 3000mPa·s. Then pour the ground slurry into the low-level storage tank of the roller coating system, adjust the speed of the pressure pump to 40r / min, and adjust the speed of the electric roller coating wheel to 80r / min, so that the surface of the electric roller coating wheel is fully infiltrated in the high-level liquid storage tank , stick the size, and then tear off the single-sided release film to expose the base-loaded film (commercially available) of the adhesive layer close to the roller coating wheel for roller coating operation. Pass the film loaded with slurry through...

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Abstract

The invention relates to a method for efficiently and continuously preparing a heat-conducting graphite film on a large area, and belongs to the technical field of preparation of heat-conducting, heat-radiating or soaking materials. The method comprises the following steps: continuously roll-coating graphene, expanded graphite dispersion or slurry on a substrate film of a multilayer structure, and then passing the substrate film covered by a coating layer through a heat drying duct or a hot air duct to remove a solvent; and then repeatedly compacting the coating layer by adopting a double-roll calender or a hydraulic machine to prepare a high-heat-conductivity graphene or expanded graphite film, and forming a back gum, a protective film or release paper on the surface of the film. The graphite film prepared by the method provided by the invention has excellent heat conductivity (the coefficient of heat conductivity in the horizontal direction can reach 300-1500W / m.K), can be produced in batches on a large area, and has a very good application effect on soaking and heat conduction of the electronic product heat dissipation field, and floor heating or wall heating systems.

Description

technical field [0001] The invention relates to a specific application of graphene or expanded graphite in the preparation of a heat-conducting graphite film, and belongs to the technical field of heat-conducting, heat-dissipating or heat-homogeneous material preparation. Background technique [0002] The miniaturization of today's electronic products, such as mobile phones, tablet computers, readers, computers, etc., has led to higher integration of integrated circuits and higher packaging requirements. However, the ensuing heat dissipation problem restricts the development direction of electronic consumer products to be thin, light, small and portable. Before the popularization and application of high-temperature superconducting materials, it is very important to explore new heat-conducting and heat-dissipating materials with higher thermal conductivity, lower density and high temperature resistance. This material can guarantee the reliability and service life of electron...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08J7/06C09D127/18C09D107/02C09D129/04C09D109/04C09D109/10C09D1/00C09D7/12C08L67/02
Inventor 贺祖章张燕萍蔡轩昊赵志国
Owner SHANGHAI LEVSON ENTERPRISE GRP
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