Preparation method of flame-retarding anti-cracking type graphite heat dissipation sheet

A graphite heat sink, graphite technology, applied in cooling/ventilation/heating transformation, modification by conduction heat transfer, etc., can solve secondary damage, can not extinguish the flame in time, graphite heat sink has no flame retardancy and crack resistance properties, etc., to achieve the effect of improving flame retardancy

Inactive Publication Date: 2018-06-29
常州水精灵环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention: Aiming at the defect that the current common graphite heat sink does not have flame retardancy and crack resistance, once the electronic product explodes and catches fire, the flame cannot be extinguished in time, and secondary damage is easily caused, a flame-retardant heat sink is provided. Preparation method of anti-crack graphite heat sink

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] According to the volume ratio of 3:1, the concentrated sulfuric acid solution with a mass fraction of 85% and acetic anhydride were mixed and stirred for 4 minutes to obtain a mixed solution, and then 20 g of graphite was weighed and ground for 10 minutes to obtain a graphite powder. The graphite powder, the mixed solution and permanganic acid Potassium was mixed and reacted for 1 hour according to the mass ratio of 5:2:1 to obtain the reactant, put the reactant in a high-temperature furnace, expand at a temperature of 900°C for 2 hours, cool and discharge, and obtain modified expanded graphite; weigh 16g Pour talcum powder into a beaker with 10mL of 32% sodium hydroxide solution and 4g of glucose, mix and stir for 10min at a temperature of 35°C to obtain a mixture, rinse the mixture twice with deionized water, and place in In an oven, dry at a temperature of 45°C for 16 minutes to obtain a dried product. Pour the dried product into a beaker with 65 mL of deionized water...

example 2

[0024]According to the volume ratio of 3:1, the concentrated sulfuric acid solution with a mass fraction of 85% and acetic anhydride were mixed and stirred for 5 minutes to obtain a mixed solution, and then 25 g of graphite was weighed and ground for 11 minutes to obtain graphite powder. The graphite powder, the mixed solution and permanganic acid Potassium was mixed and reacted for 1.5 hours according to the mass ratio of 5:2:1 to obtain the reactant. The reactant was put into a high-temperature furnace, expanded at a temperature of 950°C for 3h, cooled and discharged to obtain modified expanded graphite; 18g of talcum powder was poured into a beaker with 11mL of 32% sodium hydroxide solution and 5g of glucose in a mass fraction of 11mL, mixed and stirred for 11min at a temperature of 40°C to obtain a mixture, rinsed with deionized water for 3 times, and placed Dry in an oven for 18 minutes at a temperature of 50°C to obtain a dried product, pour the dried product into a beake...

example 3

[0026] According to the volume ratio of 3:1, the concentrated sulfuric acid solution with a mass fraction of 85% and acetic anhydride were mixed and stirred for 6 minutes to obtain a mixed solution, and then 30 g of graphite was weighed and ground for 12 minutes to obtain graphite powder. The graphite powder, the mixed solution and permanganic acid Potassium was mixed and reacted for 2 hours according to the mass ratio of 5:2:1 to obtain the reactant, which was put into a high-temperature furnace, expanded at a temperature of 1000°C for 4 hours, cooled and discharged to obtain modified expanded graphite; weigh 20g of talc Pour the powder into a beaker with 12mL of 32% sodium hydroxide solution and 6g of glucose, mix and stir for 12min at a temperature of 45°C to obtain a mixture, rinse the mixture 4 times with deionized water, and place in an oven after washing , dried at a temperature of 55°C for 20 minutes to obtain a dried product, poured the dried product into a beaker with...

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Abstract

The invention relates to a production method of graphite heat dissipation sheets and in particular relates to a preparation method of a flame-retarding anti-cracking type graphite heat dissipation sheet. The flame-retarding anti-cracking type graphite heat dissipation sheet is prepared by taking modified expanded graphite as a matrix and modified talcum powder and modified wollastonite fibers as areinforcing agent, and adding with silica sol, copper powder, iron powder and the like; firstly, graphite powder is modified by utilizing a concentrated sulfuric acid solution; the modified graphitepowder is blended with acetic anhydride and potassium permanganate to obtain expanded graphite; after the graphite is treated through concentrated sulfuric acid, a relatively good heat-insulation layer is formed, so that the flame-retarding property of the graphite heat dissipation sheet is improved; a pyrophosphoric acid acyloxy group is introduced into the surface of the graphite heat dissipation sheet so that the flame-retarding property of the graphite heat dissipation sheet is improved; polyethylene glycol stearate and the silica sol are continually used for modifying the wollastonite fibers; the contact area between the graphite heat dissipation sheet and the matrix is enlarged by adopting a coarse surface structure, and the bonding strength of an interface can be effectively improved, so that the anti-cracking performance of the graphite heat dissipation sheet is improved and the graphite heat dissipation sheet has a wide application prospect.

Description

technical field [0001] The invention relates to a method for manufacturing a graphite heat sink, in particular to a method for preparing a flame-retardant and crack-resistant graphite heat sink. Background technique [0002] As we all know, the operating temperature of electronic components directly determines its service life and stability. To keep the operating temperature of each component of the PC within a reasonable range, the problem of strengthening heat dissipation cannot be avoided. [0003] Heat sinks are currently the most effective heat dissipation method. With the large demand for heat sinks in the market, various types of heat sinks have appeared one after another. The heat dissipation materials currently used are basically aluminum alloy, but the thermal conductivity of aluminum is not very high. Gold and silver have high thermal conductivity, but the price is too high. The thermal conductivity of copper is next, but copper is heavy and easy to oxidize. , an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/24C04B20/02C04B20/04H05K7/20C04B14/46C04B14/02C04B14/04C04B111/28
CPCC04B20/023C04B20/04C04B28/24C04B2111/00465C04B2111/28C04B2111/343H05K7/2039C04B14/024C04B14/042C04B14/465C04B14/34
Inventor 陈龙杨亚生张建初
Owner 常州水精灵环保设备有限公司
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