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A kind of preparation method of polyvinylidene fluoride based heat conduction composite material

A technology of polyvinylidene fluoride and heat-conducting composite materials, which is applied in the field of preparation of heat-conducting composite materials, can solve the problems of composite materials such as decline in mechanical properties, dispersion, poor interface interaction, and slow improvement, so as to improve mechanical properties and promote mutual dispersion , the effect of expanding the layer spacing

Active Publication Date: 2016-10-12
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dispersion of the filler in the matrix and the interface effect are poor, and the thermal conductivity of the polyvinylidene fluoride material cannot be improved at a low content; while the addition of a high content of carbon-based filler can improve the thermal conductivity of the polyvinylidene fluoride material. , but it is easy to cause the filler to agglomerate and form a stress concentration point, resulting in a decline or slow improvement in the mechanical properties of the composite material

Method used

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  • A kind of preparation method of polyvinylidene fluoride based heat conduction composite material
  • A kind of preparation method of polyvinylidene fluoride based heat conduction composite material

Examples

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Effect test

Embodiment 1

[0021] A preparation method of a polyvinylidene fluoride-based thermally conductive composite material, the steps of which are:

[0022] A, preparation of graphene oxide / N,N-dimethylformamide solution:

[0023] The 25% graphene oxide aqueous solution prepared by the Hummers method is dissolved in N,N-dimethylformamide and distilled under reduced pressure, the volume ratio of the graphene oxide aqueous solution to N,N-dimethylformamide 2:1, the temperature of vacuum distillation is 55°C, and the time is 8h; after the distillation, the distillate is ultrasonically treated, the ultrasonic treatment time is 1h, and the ultrasonic efficiency is 5×10 4 W / m 3 .

[0024] The Hummers method is an existing method for preparing graphene oxide through a redox reaction. For details, see Hummers WS, Offeman RE. Preparation of Graphite Oxide. Journal of the American Chemical Society, 1958, 80: 1339-1339.

[0025] B. Composite material preparation:

[0026] Add polyvinylidene fluoride and...

Embodiment 2

[0035] A, preparation of graphene oxide / N,N-dimethylformamide solution:

[0036] The 50% graphene oxide aqueous solution prepared by the Hummers method is dissolved in N,N-dimethylformamide and distilled under reduced pressure, the volume ratio of graphene oxide aqueous solution to N,N-dimethylformamide 2:1, the vacuum distillation temperature is 60°C, and the distillation time is 12h; after the distillation, the distillate is ultrasonically treated, the ultrasonic treatment time is 2h, and the ultrasonic efficiency is 2.5×10 4 W / m 3 .

[0037] B. Preparation of composite materials:

[0038] Add polyvinylidene fluoride and carbon nanotubes to the distillate in step A, and stir magnetically for 6 hours at 90°C to obtain a mixed solution. The mass ratio of polyvinylidene fluoride, carbon nanotubes and graphene oxide is 90:8 : 2; then the mixed solution was ultrasonically treated at 90°C, and then heated to 120°C to obtain a viscous solution, and then the viscous solution was ...

Embodiment 3

[0040] A, preparation of graphene oxide / N,N-dimethylformamide solution:

[0041] The 35% graphene oxide aqueous solution prepared by the Hummers method is dissolved in N,N-dimethylformamide and distilled under reduced pressure, the volume ratio of the graphene oxide aqueous solution to N,N-dimethylformamide 2:1, the vacuum distillation temperature is 58°C, and the distillation time is 10h; after the distillation, the distillate is ultrasonically treated, the ultrasonic treatment time is 1.5h, and the ultrasonic efficiency is 3×10 4 W / m 3 .

[0042] B. Preparation of composite materials:

[0043]Add polyvinylidene fluoride and carbon nanotubes to the distillate in step A, and stir magnetically for 4 hours at 85°C to obtain a mixed solution. The mass ratio of polyvinylidene fluoride, carbon nanotubes and graphene oxide is 90:5 : 5; then the mixed solution was ultrasonically treated at 85°C, heated to 110°C to obtain a viscous solution, and then put into a 60°C oven to dry the...

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Abstract

The invention discloses a preparation method of a polyvinylidene-fluoride-based heat-conducting composite material. The method comprises the following steps: A preparing graphene oxide / N,N-dimethyl formamide solution, namely preparing a graphene oxide water solution of which the mass percent is 25-50% by a Hummers method, dissolving the graphene oxide water solution into N,N-dimethyl formamide and distilling at reduced pressure, wherein the volume ratio of the graphene oxide water solution to N,N-dimethyl formamide is 2 to 1, and carrying out ultrasonic treatment on distillate; and B preparing a composite material, namely adding the polyvinylidene fluoride and a carbon nano tube to the distillate, magnetically stirring at 80-90 DEG C for 3-6 hours to obtain a mixed liquid, wherein the mass ratio of polyvinylidene fluoride to the carbon nano tube to the graphene oxide is (80-90) to (5-15) to (1-5); carrying out ultrasonic treatment on the mixed liquid at 80-90 DEG C, and heating to 100-120 DEG C, thereby obtaining viscous fluid; and putting the viscous fluid into a drying oven at 50-80 DEG C, and drying. The polyvinylidene-fluoride-based heat-conducting composite material prepared by the method has high heat-conducting property and good mechanical property.

Description

technical field [0001] The invention belongs to the technical field of preparation of heat-conducting composite materials. Background technique [0002] Polyvinylidene fluoride is a homopolymer of vinylidene fluoride, which has the characteristics of both fluororesin and general-purpose resin. In addition to special properties such as piezoelectricity, pyroelectricity, and dielectricity, it also has excellent corrosion resistance and corrosion resistance. High temperature and other properties, has become the second largest variety of fluororesin except polytetrafluoroethylene, and has a very wide range of applications in industry, civil, military, scientific research and other fields. Compared with other polymer materials, polyvinylidene fluoride has excellent corrosion resistance, good electrical properties and thermal properties; making it widely used as a matrix in the field of high dielectric, high electrical conductivity, and high thermal conductivity modified composite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K9/04C08K3/04C08K7/24
CPCC08K3/04C08K7/24C08K9/02C08K2201/003C08K2201/004C08L2201/56C08L27/16
Inventor 王勇张文斌杨静晖黄婷张楠
Owner SOUTHWEST JIAOTONG UNIV
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