Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing graphene composite solid-solid phase change material

A solid-solid phase change material and graphene composite technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of easy supercooling and low thermal conductivity, achieve rapid heat absorption and release, and simple process , the effect of reducing supercooling phenomenon

Inactive Publication Date: 2021-03-30
江苏烯泰石墨烯应用技术研究院有限公司 +1
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of polyol phase change materials is that they have low thermal conductivity and are prone to supercooling.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing graphene composite solid-solid phase change material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The method for preparing graphene composite solid-solid phase change material of the present invention comprises the following steps:

[0017] (1) Graphene powder is made by oxidation-reduction method, mechanical exfoliation method or CVD method, and the sheet diameter of graphene is 5 to 10 μm. In this embodiment, the oxidation-reduction method is adopted, and the sheet diameter of the graphene is 7 μm.

[0018] (2) Mix neopentyl glycol (NPG) with pentaerythritol (PE), the mass ratio of the two is 2:1, heat to 200 ° C, make it in a molten state; then add graphene powder with a mass fraction of 1% body, mixed and stirred evenly to obtain graphene composite phase change slurry. The slurry was extruded through a slit extruder to form a sheet with a thickness of 4 mm.

[0019] According to ASTM C1784-14 (Standard Test Method for Measuring Thermal Storage Performance of Phase Change Materials and Products Using Heat Flowmeter Device), the phase change temperature point of...

Embodiment 2

[0021] The preparation method of graphene phase-change material plate of the present invention comprises the following steps:

[0022] (1) Graphene powder is made by oxidation-reduction method, mechanical exfoliation method or CVD method, the sheet diameter of graphene is 5 to 10 μm, and the number of layers is 2 to 10 layers. In this embodiment, a mechanical exfoliation method is adopted, and the graphene sheet diameter is 10 μm.

[0023] (2) Mix neopentyl glycol (NPG) and pentaerythritol (PE) with a mass ratio of 2:1, and heat to 200°C to make it in a molten state. Then add graphene powder with a mass fraction of 0.1%, mix and stir evenly to obtain graphene composite phase change slurry. The slurry was extruded through a slit extruder to form a sheet with a thickness of 2 mm. The phase change temperature of the graphene composite phase change material is 85-95°C, the latent heat of phase change is 189kJ / kg·°C, and the thermal conductivity is 0.85W / (m·K). Compared with the...

Embodiment 3

[0025] (1) Graphene powder is made by oxidation-reduction method, mechanical exfoliation method or CVD method, the sheet diameter of graphene is 5 to 10 μm, and the number of layers is 2 to 10 layers. In this embodiment, the CVD method is adopted, and the diameter of the graphene sheet is 5 μm.

[0026] (2) Mix neopentyl glycol (NPG) and pentaerythritol (PE) with a mass ratio of 2:1, and heat to 200°C to make it in a molten state. Then add graphene powder with a mass fraction of 3%, mix and stir evenly to obtain graphene composite phase change slurry. The slurry was extruded through a slit extruder to form a sheet with a thickness of 10 mm. The phase change temperature point of the graphene composite phase change material is 85-95°C, the latent heat of phase change is 189kJ / kg·°C, and the thermal conductivity is 4.2W / (m·K). Compared with the thermal conductivity of 0.19W / (m K) of pure phase change materials neopentyl glycol (NPG) and 0.24W / (m K) of pentaerythritol (PE), the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Phase transition temperature pointaaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a graphene composite solid-solid phase change material, which comprises the following steps: (1) preparing graphene powder with the sheet diameter of 5-10 [mu]m; (2) heating a mixture of two or more of pentaerythritol (PE), trimethylolethane (PG), neopentyl glycol (NPG), 2-amino-2-methyl-1,3-propylene glycol (AMP) and trimethylol aminomethane (TAM) toa molten state, then adding graphene powder with the weight percentage of 0.1%-10%, and conducting mixing and uniform stirring to prepare graphite polyol composite slurry; and (3) extruding the graphite polyol composite slurry in the molten state to form the graphene composite solid-solid phase change material plate with the thickness of 2-10mm.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a method for preparing graphene composite solid-solid phase change materials. Background technique [0002] Phase change materials refer to substances that change the state of matter and provide latent heat under the condition of constant temperature. The process of changing physical properties is called a phase change process, and the phase change material will absorb or release a large amount of latent heat at this time. Phase change materials can be divided into organic and inorganic phase change materials. It can also be divided into hydrated salt phase change materials and waxy phase change materials. [0003] Our most common phase change material is water. When the temperature is as low as 0°C, water changes from liquid to solid (freezing). Water changes from solid to liquid (dissolved) when the temperature is above 0°C. A large amount of cold energy is a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 姜斌宋琪
Owner 江苏烯泰石墨烯应用技术研究院有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com