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Vertically-arranged boron nitride nanosheet polymer composite material heat-conducting sheet and preparation method thereof

A composite material, vertical arrangement technology, applied in the field of boron nitride nanosheet polymer composite material and the preparation of the material, can solve the problems of poor mechanical properties and high material cost, achieve excellent thermal conductivity, simple preparation method, strong Effects of oxidation resistance and chemical inertness

Inactive Publication Date: 2021-10-22
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, to obtain a thermally conductive material with higher thermal conductivity, a large amount of thermally conductive filler is usually required to establish a network of thermally conductive fillers throughout the sample, but this will result in higher cost and poor mechanical properties of the material. Therefore, the preparation of thermally conductive Composite thermal conductive materials with vertically arranged fillers in the polymer matrix have become a research hotspot

Method used

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  • Vertically-arranged boron nitride nanosheet polymer composite material heat-conducting sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. S01, preparation of boron nitride nanosheet polymer composite slurry: Weigh the water-based polyurethane emulsion with a solid content of 35%, add hexagonal boron nitride nanosheets, the thickness of the boron nitride nanosheets is 50 nm, and the thickness of the boron nitride nanosheets is 50 nm. 10 microns in diameter. Then add deionized water (solvent) and hydroxypropyl cellulose (surfactant) and stir for 24 hours. In the obtained mixed slurry, the mass proportion of deionized water is 69.95%, the mass proportion of surfactant is 0.05%, the mass percentage of polyurethane matrix is ​​15%, the mass percentage of boron nitride nanosheet is 15%, and the composite slurry The viscosity of the material is 1000 centipoise.

[0033] 2. S02, preparation of boron nitride nanosheet polymer composite film: pour the boron nitride nanosheet polyurethane composite slurry into the casting machine to coat the film, dry at 180°C for 100 minutes, and make a nitrogen film with a thick...

Embodiment 2

[0039] 1. S01, preparing boron nitride nanosheet polymer composite slurry: Weigh polyacrylic acid with a solid content of 40%, add hexagonal boron nitride nanosheets, the thickness of boron nitride nanosheets is 100 nm, and the diameter of the boron nitride nanosheets is 100 nm. is 5 microns. Add ethanol (solvent) and polyvinylpyrrolidone (surfactant) and stir for 24 hours. In the obtained composite slurry, the mass proportion of ethanol was 59.97%. The mass percentage of the surfactant is 0.03%, the mass percentage of polyacrylic acid is 19%, and the mass percentage of boron nitride nanosheets is 21%. The viscosity of the composite slurry was 1700 centipoise.

[0040] 2. S02, preparation of boron nitride nanosheet polymer composite film: Pour the boron nitride nanosheet polyacrylic acid composite slurry into a casting machine to coat the film, dry at 200°C for 8 minutes, and make a thickness of about 60 μm boron nitride nanosheet polyacrylic acid composite film.

[0041] ...

Embodiment 3

[0046] 1. S01, prepare boron nitride nanosheet polymer composite slurry: weigh a certain amount of silica gel, add hexagonal boron nitride nanosheets, the thickness of the boron nitride nanosheets is 100 nm, and the sheet diameter is 5 microns. Add xylene (solvent) and sodium dodecylbenzenesulfonate (surfactant) and stir for 24 hours. In the obtained composite slurry, the mass ratio of xylene was 63.45%. The mass percentage of the surfactant is 0.05%, the mass percentage of silica gel is 20%, and the mass percentage of boron nitride nanosheets is 16.5%. The viscosity of the composite slurry was 3000 centipoise.

[0047] 2. S02, preparation of boron nitride nanosheet polymer composite film: pour the boron nitride nanosheet silica gel composite slurry into the casting machine to coat the film, dry at 200°C for 8 minutes, and make a film with a thickness of about 50 μm Boron Nitride Nanosheet Silica Composite Membrane.

[0048] 3. S03, stacking: stack 600 boron nitride nanoshe...

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Abstract

The invention provides a vertically arranged boron nitride nanosheet polymer composite material heat-conducting sheet and a preparation method thereof. A composite material takes a boron nitride nanosheet with a sheet structure as a filler, the filler is added into a polymer matrix, and a horizontally arranged boron nitride nanosheet polymer composite film is formed through stirring and casting processes, and stacking, hot-pressing fusion and yarn cutting processes are performed on the boron nitride nanosheet polymer composite film to prepare the vertically arranged boron nitride nanosheet polymer composite material heat-conducting sheet. Boron nitride nanosheets are vertically arranged in the polymer matrix, so that the interface thermal resistance is reduced, the heat conductivity coefficient of the material is improved, the composite material heat-conducting sheet with the thickness of 0.05-0.40 mm can be obtained through the yarn cutting process, the thermal resistance is smaller, and heat transfer is facilitated. The method is simple, reliable and high in operability, and can be applied to preparation of polymer composite materials of boron nitride nanosheets and various systems. The boron nitride nanosheet composite material heat-conducting sheet prepared by the method provided by the invention can be widely applied to heat management of electronic products.

Description

technical field [0001] The invention relates to a boron nitride nanosheet polymer composite material and a preparation method of the material. Background technique [0002] With the development of integration and miniaturization of electronic equipment, excessive heat generated during high-efficiency operation seriously affects the performance and life of electronic equipment, which has become a huge challenge for the microelectronics industry. Therefore, materials with high thermal conductivity are urgently needed to solve the problem of heat conduction. Thermally conductive materials composed of polymers and thermally conductive fillers have the advantages of easy processing and molding, high degree of freedom in product design, and low cost, and have broad application prospects. [0003] Common thermally conductive fillers include metal particles, carbon nanotubes, boron nitride nanosheets, and aluminum nitride particles. Among them, the thermal conductivity of boron ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01C08L75/04C08L33/02C08L83/04C08K7/00C08J5/18
CPCB29D7/01C08J5/18C08K7/00C08K2201/011C08J2375/04C08J2333/02C08J2383/04
Inventor 王华涛吴绪磊高峰钟博王春雨张涛周薇薇姚旺
Owner HARBIN INST OF TECH AT WEIHAI
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