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Modified graphite-based functional filler, thermal interface material and preparation method thereof

A technology of thermal interface materials and functional fillers, applied in the field of thermal interface materials and their preparation, and functional fillers, can solve the problems of thermal conductivity, electromagnetic shielding effectiveness, multiple coupling balance applications, and the inability to achieve flexible features, etc., to achieve enhanced electromagnetic shielding effectiveness , Improving the electromagnetic shielding efficiency and the effect of high thermal conductivity

Active Publication Date: 2021-12-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of this, the present disclosure provides a modified graphite-based functional filler and a thermal interface material using the filler to solve the problem that existing thermal interface materials cannot achieve the multiple coupling balance of flexible features, thermal conductivity, and electromagnetic shielding effectiveness, so that their applications are limited. limit problem

Method used

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  • Modified graphite-based functional filler, thermal interface material and preparation method thereof
  • Modified graphite-based functional filler, thermal interface material and preparation method thereof
  • Modified graphite-based functional filler, thermal interface material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Step (1): Rapid in-situ thermal expansion of 5g graphite compound at 700°C for 80s to obtain porous worm graphite;

[0096] Step (2): 10g liquid nitrile rubber, 0.02g sulfur, 0.02g 2,2'-dithiodibenzothiazole, 0.02g 2,2,4-trimethyl-1,2-dihydroquinoline polymerization Add appropriate amount of ethyl acetate to the body and 3.2g worm graphite filler to obtain a liquid rubber mixture;

[0097] Step (3): The liquid rubber mixture is vacuum multi-stage mixed and assembled to obtain a homogeneous mixture; wherein, the vacuum degree during mixing is -100kPa; the rotation speed of the first-order mixing is 500rpm, and the stirring time is 45s; the rotation speed of the second-order mixing The rotation speed of the three-stage mixing is 1800 rpm, and the stirring time is 120 s.

[0098] Step (4): Put the obtained homogeneous mixture into an oven at 60°C for solvent volatilization for 48 hours, remove residual ethyl acetate and volatile matter, and obtain a composite material pre...

Embodiment 2

[0101] Step (1): Rapid in-situ thermal expansion of 5g graphite compound at 700°C for 80s to obtain porous worm graphite;

[0102] Step (2): Mix 3.6g of porous worm graphite and 0.75g of 4-(2-aminoethyl)-1,2-benzenediol hydrochloride in 500g of Tris hydrochloride and ethanol buffer Internal mixing at room temperature for in-situ polymerization for 36 hours to obtain a functional filler precursor; fully washing the functional filler precursor, and freeze-drying for 48 hours to obtain the in-situ polymerization modified modified graphite-based functional filler;

[0103] Step (3): In 10g liquid nitrile rubber, 0.02g sulfur, 0.02g 2,2'-dithiodibenzothiazole, 0.02g 2,2,4-trimethyl-1,2-dihydroquinoline Add an appropriate amount of ethyl acetate to the morphine polymer, 3.2g in-situ polymerization modified modified graphite-based functional filler, to obtain a liquid rubber mixture;

[0104] Step (4): Vacuum multi-stage mixing and assembly of the liquid rubber mixture to obtain a h...

Embodiment 3

[0108] Step (1): Mix 5g graphite flakes and 0.75g γ-aminopropyltriethoxysilane in 400g, 25wt% isopropanol buffer solution and perform in-situ polymerization at room temperature for 36 hours to obtain a functional filler precursor; and The functional filler precursor is fully washed and freeze-dried for 48 hours to obtain the in-situ polymerized modified graphite-based functional filler;

[0109] Step (2): polymerize in 10g liquid rubber, 0.02g sulfur, 0.02g 2,2'-dithiodibenzothiazole, 0.02g 2,2,4-trimethyl-1,2-dihydroquinoline Add appropriate amount of xylene to 3.2g in-situ polymerization modified graphite-based functional filler to obtain a liquid rubber mixture;

[0110] Step (3): The liquid rubber mixture is vacuum multi-stage mixed and assembled to obtain a homogeneous mixture; wherein, the vacuum degree during mixing is -100kPa; the rotation speed of the first-order mixing is 500rpm, and the stirring time is 45s; the rotation speed of the second-order mixing The rotatio...

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Abstract

The invention discloses a modified graphite-based functional filler, a thermal interface material and preparation methods of the modified graphite-based functional filler and the thermal interface material, the modified graphite-based functional filler comprises vermicular expanded graphite, and the surface of the vermicular expanded graphite is provided with a chemical active coating; the chemical active coating is used for introducing an active group to improve the polarity of the vermicular expanded graphite; the thermal interface material comprises the modified graphite-based functional filler and liquid rubber; and the problem that application of an existing thermal interface material is limited due to the fact that the existing thermal interface material cannot achieve multi-coupling balance of the flexible characteristic, the heat conduction performance and the electromagnetic shielding effectiveness is solved.

Description

technical field [0001] The disclosure relates to thermal management functional materials, in particular to a functional filler, a thermal interface material using the functional filler and a preparation method thereof. Background technique [0002] Due to the further development of 5G mobile communication technology and integrated circuit manufacturing technology, modern electronic equipment is developing towards high operating frequency and miniaturization. However, high integration and high power density will accelerate the aging process of core electronic equipment and cause a series of serious problems in the field of thermal management. In addition, the complex electromagnetic waves generated by the operation of some radio frequency chips will not only affect the work of adjacent electronic modules, but also cause harm to human health, and because most electromagnetic shielding materials absorb and reflect electromagnetic waves and convert them into heat energy to achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/06C08K9/04C08K7/24C08L9/02C08L79/04
CPCC08L9/02C08K9/06C08K9/04C08K7/24C08L79/04Y02T10/86
Inventor 汪怀远高越阳朱艳吉崔业翔徐飞
Owner TIANJIN UNIV
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