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Method of utilizing magnetic field orientation to prepare brick-mud structure heat-conducting polymer composite material

A technology of thermally conductive composite materials and thermally conductive polymers is applied in the field of preparation of polymer composite materials, which can solve the problems of high cost of raw materials, complicated preparation process, and difficulty in making good use of the structural characteristics of fillers, etc., so as to improve the interface thermal resistance, The effect of high thermal conductivity

Active Publication Date: 2019-05-31
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Yan jun Xiao et al. (J.Phys.Chem.C 120(2016) 6344-6355) added flake BN and fibrous CNTs to the PVDF matrix to obtain a composite material with good thermal conductivity and high dielectric constant , but the cost of raw materials used in this method is high and the preparation process is complicated. The two kinds of fillers are randomly distributed in the matrix, and it is difficult to make good use of the structural characteristics of the fillers.

Method used

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  • Method of utilizing magnetic field orientation to prepare brick-mud structure heat-conducting polymer composite material
  • Method of utilizing magnetic field orientation to prepare brick-mud structure heat-conducting polymer composite material
  • Method of utilizing magnetic field orientation to prepare brick-mud structure heat-conducting polymer composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Ingredients

[0030] PVDF 89%,

[0031] BN 10%,

[0032] GO 1%.

[0033] 1. Preparation

[0034] (1) Add BN to distilled water and stir for 15 minutes, after ultrasonic dispersion treatment at 25°C for 24h, perform suction filtration, and freeze-dry at -50 to -60°C for 24h.

[0035] (2) Add the BN obtained above to the Piranha treatment solution (concentrated H 2 SO 4 :30%H 2 o 2 =7:3), the solid-liquid ratio of BN and Piranha treatment solution is 1g:30mL, stirred at 25°C for 2h, centrifuged at 4000-6000r / min, filtered, washed, dried at 80°C for 6h, and the modified sex BN;

[0036] (3) Add modified BN to ethylene glycol, sonicate for 24h, and then add FeCl 3 ·6H 2 O and sodium acetate trihydrate (mass ratio 1:2.7) were stirred for 2 hours, and the mass ratio of FeCl 3 ·6H 2 O: BN=1:6, pour it into a 150mL reactor, react at 200°C for 8h, cool to room temperature after the reaction, and prepare BN@Fe 3 o 4 ;

[0037] (4) The BN@Fe prepared above 3 o ...

Embodiment 2

[0055] 1. Ingredients

[0056] PVDF 79%,

[0057] BN 20%,

[0058] GO 1%.

[0059] 2. Preparation

[0060] (1) Add BN to distilled water and stir for 15 minutes, after ultrasonic dispersion treatment at 25°C for 24h, perform suction filtration, and freeze-dry at -50 to -60°C for 24h.

[0061] (2) Add the BN obtained above to the Piranha treatment solution (concentrated H 2 SO 4 :30%H 2 o 2 =7:3), the solid-liquid ratio of BN and Piranha treatment solution is 1g:30mL, stirred at 25°C for 2h, centrifuged at 4000-6000r / min, filtered, washed, dried at 80°C for 6h, and the modified sex BN;

[0062] (3) Add modified BN to ethylene glycol, sonicate for 24h, and then add FeCl 3 ·6H 2 O and sodium acetate trihydrate (mass ratio 1:2.7) were stirred for 2 hours, and the mass ratio of FeCl 3 ·6H 2 O: BN=1:6, pour it into a 150mL reactor, react at 200°C for 8h, cool to room temperature after the reaction, and prepare BN@Fe 3 o 4 ;

[0063] (4) The BN@Fe prepared above 3 o ...

Embodiment 3

[0081] 1. Ingredients

[0082] PVDF 69%,

[0083] BN 30%,

[0084] GO 1%.

[0085] 2. Preparation

[0086] (1) Add BN to distilled water and stir for 15 minutes, after ultrasonic dispersion treatment at 25°C for 24h, perform suction filtration, and freeze-dry at -50 to -60°C for 24h.

[0087] (2) Add the BN obtained above to the Piranha treatment solution (concentrated H 2 SO 4 :30%H 2 o 2 =7:3), the solid-liquid ratio of BN and Piranha treatment solution is 1g:30mL, stirred at 25°C for 2h, centrifuged at 4000-6000r / min, filtered, washed, dried at 80°C for 6h, and the modified sex BN;

[0088] (3) Add modified BN to ethylene glycol, sonicate for 24h, and then add FeCl 3 ·6H 2 O and sodium acetate trihydrate (mass ratio 1:2.7) were stirred for 2 hours, and the mass ratio of FeCl 3 ·6H 2 O: BN=1:6, pour it into a 150mL reactor, react at 200°C for 8h, cool to room temperature after the reaction, and prepare BN@Fe 3 o 4 ;

[0089] (4) The BN@Fe prepared above 3 o ...

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Abstract

The invention discloses a method of utilizing magnetic field orientation to prepare a brick-mud structure heat-conducting polymer composite material. The method includes: ultrasonically treating BN, using a Piranha solution to treat the same, adopting a solvothermal method to prepare treated BN into BN@Fe3O4 magnetic filler, well mixing BN@Fe3O4, graphene oxide and polyvinylidene fluoride in a solvent, heating concentrate until solid content is 70-75%, putting the concentrate into a magnetic field to enable BN@Fe3O4 to be directionally arranged, and drying to volatilize the solvent to obtain the brick-mud structure heat-conducting composite material. The magnetic field is utilized to enable BN@Fe3O4 to be in directional arrangement in a polymer matrix to serve as 'brick' of the composite material, graphene oxide is self-assembled in PVDF with BN@Fe3O4 to form a heat-conducting pathway to serve as 'mud' of the composite material, interface heat resistance with PVDF can be improved, andhigher heat-conducting coefficient can be acquired under certain consumption of the heat-conducting filler.

Description

technical field [0001] The invention relates to a method for preparing a polymer composite material, in particular to a method for preparing a brick-mud structure heat-conducting polymer composite material by using magnetic field orientation, and belongs to the technical field of polymer composite materials. Background technique [0002] With the development of electronic information science and technology, the power and performance of large industrial equipment and small microelectronic devices have been continuously improved. Inevitably, the heat generated during the use of these devices will also continue to increase. If the accumulated heat cannot be diffused to the outside in time, it will affect the working efficiency and service life of the equipment, and seriously cause damage to the equipment or cause danger. Therefore, materials with high thermal conductivity are required to export heat in time to ensure the normal operation of equipment and instruments. As a new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/02C08K3/38C08K3/22C08K3/04C08J3/28C09K5/14
Inventor 夏茹张振曹明陈鹏钱家盛伍斌杨斌
Owner ANHUI UNIVERSITY
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