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A kind of insulating polyvinyl alcohol composite heat-conducting film and preparation method thereof

A technology of polyvinyl alcohol and thermally conductive film, which is applied in the field of thermally conductive materials and can solve problems such as limited applications

Active Publication Date: 2021-08-17
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene has high electrical conductivity (10 6 S / cm), when graphene is doped into a polymer matrix to construct a composite material, the electrical conductivity of the composite material will be significantly improved, which severely limits its application in the field of thermal management of electronic devices
Therefore, how to improve the thermal conductivity of the material without sacrificing the excellent electrical insulation properties and flexibility of the composite material remains a great challenge.

Method used

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  • A kind of insulating polyvinyl alcohol composite heat-conducting film and preparation method thereof
  • A kind of insulating polyvinyl alcohol composite heat-conducting film and preparation method thereof
  • A kind of insulating polyvinyl alcohol composite heat-conducting film and preparation method thereof

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preparation example Construction

[0032] The invention provides a preparation method for the above-mentioned insulating polyvinyl alcohol composite heat-conducting film, comprising the following steps:

[0033] (1) polyvinyl alcohol, film-forming aid and water are mixed to obtain a polyvinyl alcohol solution;

[0034] (2) provide graphene oxide aqueous dispersion;

[0035] (3) mixing the polyvinyl alcohol solution, graphene oxide aqueous dispersion and reducing agent to obtain polyvinyl alcohol / graphene oxide / reducing agent mixed solution;

[0036] (4) Scrape the polyvinyl alcohol / graphene oxide / reductant mixture in sequence, leave it standing and heat dry to obtain an insulating polyvinyl alcohol composite heat-conducting film; the temperature of the heat drying is 60-100°C, The time is 8~16h;

[0037] The steps (1)-(2) are not limited by time sequence.

[0038] Unless otherwise specified, the raw materials used in the present invention are all commercially available.

[0039]The invention mixes polyvinyl...

Embodiment 1

[0051] (1) Disperse 9 g of polyvinyl alcohol particles (polymerization degree of 1700) in 90 mL of water, stir magnetically at room temperature until the solution is uniform and transparent, then add 1 g of glycerin, and stir magnetically at 90°C for 2 hours to obtain a polyvinyl alcohol solution;

[0052] (2) 0.7g sheet thickness is 0.8~1.3nm graphene oxide is mixed with 99.3mL deionized water, obtains the graphene oxide dispersion liquid of 0.7wt% at 100W ultrasonic 2min;

[0053] (3) Mix 100 mL of the polyvinyl alcohol solution obtained in step (1) with 13 mL of the graphene oxide dispersion obtained in step (2) and ultrasonically disperse for 2 min under high-frequency ultrasound to obtain uniformly dispersed polyvinyl alcohol / graphene oxide mixed solution;

[0054] (4) Mix the mixed solution obtained in step (3) with ascorbic acid (mass ratio GO:Vc=1:6) at room temperature 200rpm and magnetically stir for 2h to obtain a mixed solution of polyvinyl alcohol / graphene oxide / r...

Embodiment 2

[0059] The difference between Example 2 and Example 1 is that the volume of the graphene oxide dispersion in step (3) is 40mL, and finally an insulating polyvinyl alcohol composite thermally conductive film with a graphene content of 3wt% is obtained.

[0060] The obtained insulation polyvinyl alcohol composite heat conduction film is carried out TEM test, and the result is the same as image 3 resemblance.

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Abstract

The invention provides an insulating polyvinyl alcohol composite heat-conducting film and a preparation method thereof, belonging to the technical field of heat-conducting materials. The insulating polyvinyl alcohol composite thermally conductive film provided by the invention comprises a polyvinyl alcohol-graphene layer and a polyvinyl alcohol layer positioned at both sides of the polyvinyl alcohol-graphene layer; the thickness of the polyvinyl alcohol-graphene layer 6-100 μm; the thickness of the polyvinyl alcohol layer is independently 0.1-3 μm. The composite heat-conducting film provided by the invention has a "sandwich" structure, both sides of the composite heat-conducting film are polyvinyl alcohol layers, and the surface does not contain graphene, so that the composite heat-conducting film has good insulation performance; the middle layer is polyvinyl alcohol-graphite Graphene can form a heat-conducting network inside the composite heat-conducting film, so that the composite heat-conducting film has excellent thermal conductivity; the present invention uses polyvinyl alcohol as the main raw material of the composite heat-conducting film, which can make the composite heat-conducting film have good flexibility.

Description

technical field [0001] The invention relates to the technical field of heat-conducting materials, in particular to an insulating polyvinyl alcohol composite heat-conducting film and a preparation method thereof. Background technique [0002] In the process of miniaturization and thinning of electronic products, the problem of heat dissipation has gradually become prominent. Studies have shown that the reliability of electronic products has an exponential relationship with the operating temperature, and a small difference in operating temperature (10-15°C) will reduce the service life of electronic equipment by 50%. Due to the advantages of light weight, flexibility, low cost, and easy processing and molding, polymers have broad application prospects in the thermal management of modern electronic products. However, polymers have extremely low intrinsic thermal conductivity (<0.5Wm -1 K -1 ) limits its application in thermoelectric materials. Many studies are keen on ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L29/04C08K3/04C09K5/14
CPCC08J5/18C09K5/14C08J2329/04C08K3/042
Inventor 陈国华罗芳华
Owner HUAQIAO UNIVERSITY