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Anisotropic PBO nanofiber heat dissipation composite material and preparation method thereof

A nanofiber and anisotropic technology is applied in the field of anisotropic PBO nanofiber heat dissipation composite materials and their preparation, which can solve the problems that the application of PBONF composite materials needs to be explored, and achieve the effect of low density and high thermal conductivity.

Active Publication Date: 2021-12-31
FOSHAN ELECTRICAL & LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, research in this field is still in its infancy, and the construction method of PBONF composites needs to be f

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  • Anisotropic PBO nanofiber heat dissipation composite material and preparation method thereof

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preparation example Construction

[0032] The invention provides a method for preparing molybdenum disulfide nanosheets with photothermal effect, which comprises the following steps:

[0033] S1: Disperse PBO fibers in a mixed solution of trifluoroacetic acid and methanesulfonic acid, and react for 1 to 20 minutes to obtain the first dispersion;

[0034] Wherein, the PBO fibers can be transformed into PBO nanofibers by treating the mixed solution of trifluoroacetic acid and methanesulfonic acid.

[0035] Wherein, the volume ratio of methanesulfonic acid and trifluoroacetic acid is (1~10):(90~99), exemplarily being 2:98, 5:95, 5.5:94.5, 6:94, 7:93, 8 :92 or 9:91, but not limited to. Preferred are (6-8): (92-94).

[0036] Wherein, after the PBO fibers are dispersed, stirring and / or ultrasonic treatment is used for 1-20 minutes to obtain the first dispersion liquid. Exemplarily, the processing time is 1 min, 3 min, 8 min, 12 min, 13 min or 18 min, but not limited thereto. Preferably, the treatment time is 5-10...

Embodiment 1

[0072] This embodiment provides a kind of anisotropic PBO nanofiber heat dissipation composite material, and its preparation method is as follows:

[0073] (1) Disperse 1 g of PBO fibers in 100 mL of a mixed solution of methanesulfonic acid and trifluoroacetic acid (the volume ratio of the two is 2.5:97.5), and stir for 10 minutes to obtain the first dispersion;

[0074] (2) Add 1 g of graphene oxide into 20 mL of 40% HI, heat at 80° C. in the dark for 5 h, then filter, and freeze-dry the filtrate for 10 h to obtain graphene nanosheets;

[0075] (3) 1g of graphene nanosheets is added to the first dispersion, and after stirring for 10min, the second dispersion is obtained;

[0076] (4) Add 2g of carbon nanotubes into the second dispersion, and stir for 10 minutes to obtain the third dispersion;

[0077] (5) The third dispersion liquid is poured on the surface of the polytetrafluoroethylene mold, placed at 40°C and 75% RH for 24 hours, then repeatedly soaked in isopropanol for ...

Embodiment 2

[0082] This embodiment provides a kind of anisotropic PBO nanofiber heat dissipation composite material, and its preparation method is as follows:

[0083] (1) Disperse 0.06g of PBO fibers in 100mL of a mixed solution of methanesulfonic acid and trifluoroacetic acid (the volume ratio of the two is 2:98), and obtain the first dispersion after ultrasonic treatment for 5 minutes;

[0084] (2) Add 1 g of graphene oxide into 10 mL of 43% HI, heat at 75° C. in the dark for 2.5 h, then filter, and freeze-dry the filtered product for 15 h to obtain graphene nanosheets;

[0085] (3) 0.5g graphene nanosheets are added to the first dispersion, and after stirring for 8min, the second dispersion is obtained;

[0086] (4) Add 0.8g of carbon nanotubes into the second dispersion, and stir for 10 minutes to obtain the third dispersion;

[0087] (5) pour the third dispersion on the surface of the polytetrafluoroethylene mold, place it at 35° C. and 85% RH for 18 hours, and then soak it in wate...

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Abstract

The invention discloses an anisotropic PBO nanofiber heat dissipation composite material and a preparation method thereof, and relates to the field of nanofibers. The preparation method comprises the following steps: converting PBO fibers into PBO nanofibers by adopting trifluoroacetic acid and methanesulfonic acid, then adding graphene nanosheets and carbon nanotubes, standing at a preset temperature and preset humidity to obtain composite hydrogel, and directionally freezing the composite hydrogel to directionally arrange the PBO nanofibers, the carbon nanotubes and the graphene nanosheets; and drying to obtain the finished product of the anisotropic PBO nanofiber heat dissipation composite material. By implementing the preparation method, the anisotropic PBO nanofiber heat dissipation composite material with high strength and high heat-conducting property can be obtained, and the composite material can be applied as a heat dissipation material of electronic and electrical products.

Description

technical field [0001] The invention relates to the field of nanofibers, in particular to an anisotropic PBO nanofiber heat dissipation composite material and a preparation method thereof. Background technique [0002] The full name of PBO is poly-p-phenylenebenzobisoxazole, which is composed of 4,6-diaminoresorcinol hydrochloride and terephthalic acid as monomers, and polyphosphoric acid as solvent for solution polycondensation, spinning and washing. , dried and obtained. PBO fiber has the advantages of good heat resistance, good friction resistance, strong dimensional stability, soft and light texture, so it is widely used in high-tech fields such as aerospace. But its application research in the field of microelectronics is less. [0003] On the other hand, in recent years, researchers at home and abroad have realized the controllable preparation of PBO nanofibers (PBONF) from polyparabenylenebenzobisoxazole (PBO) fibers, and found that PBONF can be effectively compound...

Claims

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Application Information

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IPC IPC(8): C09K5/14C01B32/184C01B32/194C01B32/168D01F6/74B82Y30/00B82Y40/00
CPCC09K5/14C01B32/184C01B32/194C01B32/168D01F6/74B82Y30/00B82Y40/00
Inventor 陈美玲丁文超朱奕光魏彬杨子键
Owner FOSHAN ELECTRICAL & LIGHTING