Preparation method of high thermal conductivity nano cellulose based electrical insulating composite film

A nanocellulose and electrical insulation technology is applied in the field of preparation of high thermal conductivity nanocellulose-based electrical insulation composite films, which can solve the problems of poor thermal conductivity of nanocellulose films, achieve optimal application value, high thermal conductivity, and improve insulation. performance effect

Inactive Publication Date: 2017-08-29
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiency of the poor thermal conductivity of the nanocellulose film, the purpose of the present invention is to prepare a method for preparing a high thermal conductivity nanocellulose-based electrical insulation composite film, which not only meets the strength performance and insulation performance requirements of the insulating film in electronic equipment and components , and can make the internal heat conduction more quickly, improve the heat dissipation performance of the equipment

Method used

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  • Preparation method of high thermal conductivity nano cellulose based electrical insulating composite film

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Embodiment 1

[0025] The bleaching kraft softwood pulp is subjected to beating pretreatment. The treatment process is as follows: the softwood pulp board is torn off and soaked in deionized water for 4 hours, and then torn into small pulp pieces of 25mm×25mm. Then pour the pulp into the Wall-E beater, add deionized water to the water tank, so that the pulp concentration reaches 2%, and start the beater to decompose until there are no small pulp lumps. Finally, hang the heavy thallium on the lever arm to start beating, and stop when the beating degree reaches 50-55°SR; take 5g of pretreated absolute dry slurry and add it to a three-necked flask, and then add 0.5g NaBr, 0.08g 2,2 , 6,6-Tetramethylpiperidine oxynitride radical (TEMPO) and 50mL NaClO solution were added to a three-necked flask, and deionized water was added to make the total volume 500mL, and the reaction was stirred at room temperature for 8h, during which dilute HCl and NaOH solution were used to Adjust the pH of the reaction...

Embodiment 2

[0027] The bleaching kraft softwood pulp is subjected to beating pretreatment. The treatment process is as follows: the softwood pulp board is torn off and soaked in deionized water for 4 hours, and then torn into small pulp pieces of 25mm×25mm. Then pour the pulp into the Wall-E beater, add deionized water to the water tank, so that the pulp concentration reaches 2%, and start the beater to decompose until there are no small pulp lumps. Finally, hang the heavy thallium on the lever arm to start beating, and stop when the beating degree reaches 50-55°SR; take 5g of pretreated absolute dry slurry and add it to a three-necked flask, and then add 0.5g NaBr, 0.08g 2,2 , 6,6-Tetramethylpiperidine oxynitride radical (TEMPO) and 50mL NaClO solution were added to a three-necked flask, and deionized water was added to make the total volume 500mL, and the reaction was stirred at room temperature for 8h, during which dilute HCl and NaOH solution were used to Adjust the pH of the reaction...

Embodiment 3

[0029] The bleaching kraft softwood pulp is subjected to beating pretreatment. The treatment process is as follows: the softwood pulp board is torn off and soaked in deionized water for 4 hours, and then torn into small pulp pieces of 25mm×25mm. Then pour the pulp into the Wall-E beater, add deionized water to the water tank, so that the pulp concentration reaches 2%, and start the beater to decompose until there are no small pulp lumps. Finally, hang the heavy thallium on the lever arm to start beating, and stop when the beating degree reaches 50-55°SR; take 5g of pretreated absolute dry slurry and add it to a three-necked flask, and then add 0.5g NaBr, 0.08g 2,2 , 6,6-Tetramethylpiperidine oxynitride radical (TEMPO) and 50mL NaClO solution were added to a three-necked flask, and deionized water was added to make the total volume 500mL, and the reaction was stirred at room temperature for 8h, during which dilute HCl and NaOH solution were used to Adjust the pH of the reaction...

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Abstract

The invention discloses a preparation method of a high thermal conductivity of nano cellulose based electrical insulating composite film, nano cellulose is prepared by a technique of combination of TEMPO oxidation and high pressure homogenization, and the thermal conductivity nano cellulose based insulating composite film is prepared by adding a thermal-conducting insulating filler into nano cellulose suspension by a casting forming method. The insulation performance and the dielectric strength of the thermal conductivity nano cellulose based insulating composite film are improved by addition of the thermal-conducting insulating filler, and the thermal-conducting insulating filler is filled in the thermal conductivity nano cellulose based insulating composite film to form heat transfer network chains to provide channels for heat transfer, so that the thermal conductivity nano cellulose based insulating composite film exhibits good thermal conductivity. Compared with conventional insulating films, the thermal conductivity nano cellulose based insulating composite film has the advantage of high thermal conductivity coefficient, and can be used as internal insulation and packaging materials in electronic devices and components to improve heat dispersion performance.

Description

technical field [0001] The invention relates to the technical field of thermally conductive and insulating diaphragm materials, in particular to a preparation method of a high thermally conductive nanocellulose-based electrical insulating composite film. Background technique [0002] With the rapid progress of electronic information technology, electronic equipment and components are developing toward miniaturization and high power, which puts forward higher requirements for the dielectric properties and heat dissipation performance of the internal insulating materials of electronic equipment and components. In order to ensure the normal and effective operation of electronic equipment, it is necessary to conduct the heat generated inside in a timely manner. Therefore, it is necessary to develop insulation and packaging materials with better thermal conductivity. [0003] Cellulose is the most abundant natural polymer aggregate in nature. As a green and renewable resource, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/04C08K3/38C08B15/04C09K5/14
CPCC08B15/04C08J5/18C08J2301/04C08K3/38C08K2003/385C08L2203/16C08L2203/20C09K5/14C08L1/04
Inventor 戴红旗俞智怀王秀
Owner NANJING FORESTRY UNIV
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