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Graphene-based heat conduction silica gel phase change composite material and preparation method thereof

A phase-change composite material and a phase-change material technology are applied in the field of graphene-based thermally conductive silica gel phase-change composite materials and their preparation, which can solve the problems of low thermal conductivity of thermally conductive silica gel, inability to store energy, and low latent heat, and achieve improved agglomeration. phenomenon, the effect of increasing latent heat, and increasing thermal conductivity

Active Publication Date: 2016-02-24
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the intermittent nature of these energies has brought great inconvenience to human utilization, so how to store energy well is particularly important
[0006] However, the thermal conductivity of the existing thermally conductive silica gel is generally low, and the latent heat is very low at the same time, so it cannot store energy while conducting heat.

Method used

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Examples

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Effect test

preparation example Construction

[0058] The present invention also provides a preparation method of a graphene-based thermally conductive silica gel phase-change composite material, comprising the following steps:

[0059] Mix thermally conductive fillers, microcapsule phase change materials, and silica gel and solidify after defoaming to obtain graphene-based thermally conductive silica gel phase change composite materials. The thermally conductive fillers are selected from graphene, alumina powder, aluminum nitride powder, and carbon nanotubes. one or more of .

[0060] In the invention, firstly, the heat conducting filler, the microcapsule phase change material and the silica gel are mixed to obtain the mixed slurry. The present invention does not have special restriction to the order of described mixing, preferably mixes according to the following method:

[0061] Mixing 7-10 μm graphene with one or more powder materials in alumina powder, aluminum nitride powder and carbon nanotubes to obtain a mixed po...

Embodiment 1

[0070] Step 1: Mix 12.5 parts of 37% formaldehyde solution with 6 parts of urea, add a few drops of triethanolamine to adjust the pH to 8.0-9.0, keep it in a water bath at 75°C for 2 hours to obtain a viscous transparent liquid; use an equal volume of deionized water Dilute and lower the temperature of the water bath to 65°C to obtain a stable urea-formaldehyde prepolymer.

[0071] Step 2: Put dodecanol (phase transition temperature 24° C.) in a 40° C. constant temperature silicone oil bath, add 15 wt % graphene with a size of 0.8 to 1 μm after complete melting, stir thoroughly and ultrasonically, make it evenly mixed, and obtain a core material.

[0072] The styrene-maleic anhydride (SMA) co-emulsifier aqueous solution and emulsifier alkylphenol polyoxyethylene ether OP-10 that mass concentration is 5wt% are 8:2 and (emulsifier and co-emulsifier total amount Accounting for 4-6% of the core material, the ratio is 8:2) mixed with the core material, at a speed of 2500rpm, combin...

Embodiment 2

[0078] Mix melamine with a molar ratio of 1:3 and a 37% mass fraction of formaldehyde solution, add a few drops of triethanolamine to adjust the pH to 8.0-9.0, stir in a water bath at 70°C for 1 hour until the solution is transparent, and obtain melamine-formaldehyde resin prepolymerization things.

[0079] Put butyl stearate (phase transition temperature 22°C) in a 40°C constant temperature silicone oil bath, add 15wt% graphene with a size of 0.8-1 μm after complete melting, fully stir and ultrasonically mix it evenly, and obtain a core material.

[0080] Add 0.4wt% emulsifier OP-10 and 2.5wt% resorcinol aqueous solution into the core material while stirring, and react for 0.5h in a water bath at 60°C to prepare an emulsion.

[0081]Add the prepared melamine-formaldehyde resin prepolymer dropwise into the emulsion prepared above (the mass ratio of the melamine-formaldehyde resin prepolymer to the above emulsion=1:1) with a separating funnel, and then stir Adjust the pH of th...

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Abstract

The invention provides a graphene-based heat conduction silica gel phase change composite material comprising silicon substrate and heat conduction phase change material dispersed in the silicon substrate. The heat conduction phase change material comprises heat conductive filler and microencapsulation phase change material, and the heat conductive filler is selected from one or more of graphene, alumina powder, aluminium nitride powder and carbon nanotube. The composite material adds the heat conductive filler into silica gel, and can form a complete heat conduction access in the silica gel, so that the thermal conductivity of the composite material is improved. Moreover, the microencapsulation phase change material is added into the silica gel, the latent heat of the composite silica gel material is improved, and a part of heat can be stored as heat conduction. Meanwhile, the heat conduction is effective as the synergism of heat conduction silica gel and phase change material.

Description

technical field [0001] The invention belongs to the technical field of heat-conducting silica gel, and in particular relates to a graphene-based heat-conducting silica gel phase-change composite material and a preparation method thereof. Background technique [0002] Thermally conductive silicone is a high-end thermally conductive compound, which can avoid risks such as short circuits due to its non-solidification and non-conductive characteristics. Moreover, the high bonding performance and super heat conduction effect of thermally conductive silica gel are currently the best heat conduction solution when the CPU, GPU and heat sink are in contact. [0003] Thermally conductive silica gel is uniformly filled in the polymer matrix material with thermally conductive fillers to improve its thermal conductivity. Commonly used high thermal conductivity fillers are mainly ceramics and metals. However, the filling of these traditional thermally conductive fillers has many disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K13/06C08K9/10C08K3/04C08K9/06C08K3/22C08K3/28C08K7/24C09K5/06C09K5/14
CPCC08K3/04C08K3/22C08K3/28C08K7/24C08K9/06C08K9/10C08K13/06C08K2003/2227C08K2003/282C08K2201/003C08K2201/011C08K2201/014C09K5/063C09K5/14C08L83/04
Inventor 马经博周旭峰刘兆平丁世云
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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