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Thermally conducting composition and method for producing the same

Inactive Publication Date: 2016-11-03
NAGOYA UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a composition made of cellulose nanofiber and at least one type of inorganic powder. This combination results in high thermal conductivity, which cannot be achieved by either ingredient alone. The composition can also include a polymer matrix, making it more effective at conducting heat. Additionally, the composition can be shaped into films or sheets, or applied to a substrate as a coating material. These properties make the composition useful for thermally conducting applications.

Problems solved by technology

However, one of the problems is that inclusion of the large amount of thermally conducting material sacrifices the characteristics of a polymer material such as flexibility and a light weight.
However, the graphite has a huge problem owing to its electric conductivity and breakability in that it may cause a short circuit in an electric circuit when broken pieces of the graphite produced during a manufacturing process drop into the electric circuit.
However, these methods reduce the thermal conductivity in a plane direction significantly, and do not solve the problems caused by the breakability of the graphite.
However, this film is obtained by using a boron nitride particle that is much larger than the cellulose nanofiber, and the thermal conductivity is still insufficient.

Method used

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  • Thermally conducting composition and method for producing the same
  • Thermally conducting composition and method for producing the same

Examples

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examples

[0039]Next, the present invention is further specifically described by way of examples and comparative examples. It should be noted that the present invention is not limited to those examples. In the following examples, % indicates mass %.

[0040]

[0041]The average particle diameter of the graphene oxide was measured by a light scattering method using “Zeta-potential& Particle size Analyzer ELS-Z” manufactured by Otsuka Electronics Co., Ltd. The values of the average particle diameter of nano alumina and nanodiamond are those indicated in technical documents provided by the manufacturer.

examples 1-4

[0042]A water-soluble cellulose nanofiber dispersion (trade name “BiNFi-s Wma-10002” (solid content 2%) manufactured by Sugino Machine Limited), nano alumina (trade name “Nano Alumina” (average particle diameter of 10 to 20 nm calculated from the measured values of a BET surface area, provided by the manufacturer) manufactured by TECNAN (NAVARREAN NANOPRODUCTS TECHNOLOGY S.L.)), and polyvinyl alcohol (trade name “PVA-505” manufactured by KURARAY CO., LTD.,) were mixed and diluted with water to have a solid concentration of 5%, which then was subjected to an ultrasonic dispersion treatment for 30 minutes, so that a water-soluble dispersion of a composition was prepared. Subsequently, the water-soluble dispersion was subjected to centrifugal defoaming to prepare a mixed water-soluble dispersion. The composition ratio is shown in Table 1. The mass ratio in the table is expressed in parts of each component by mass per 1 part by mass of polyvinyl alcohol. The mixed water-soluble dispersi...

examples 5-12

[0044]10 g of water-soluble cellulose nanofiber dispersion (trade name “BiNFi-s Wma-10002” (solid content 2%) manufactured by Sugino Machine Limited), and nano alumina (trade name “Nano Alumina” (average particle diameter of 10 to 20 nm calculated from the measured values of a BET surface area, provided by the manufacturer) manufactured by TECNAN (NAVARREAN NANOPRODUCTS TECHNOLOGY S.L.)) or water-soluble nanodiamond dispersion (trade name “Andante” (primary particle diameter of 4.2 nm, solid content 5%) manufactured by Carbodeon Ltd Oy.), were mixed with a centrifugal mixer, and 8 g (4 g for Example 8) of methanol was further added and mixed with a centrifugal mixer to prepare a dispersion. The composition is shown in Table 2. The dispersion was poured into the inside of a paper frame having a thickness of 1.7 mm mounted on a PET film. After air-drying at room temperature for 2 hours, the film was dried in an oven at a temperature of 70° C. for 20 minutes and further dried in an ove...

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Abstract

A thermally conducting composition of the present invention includes (A) a cellulose nanofiber, and (B) at least one type of an inorganic powder selected from a metal oxide and a diamond having an average particle diameter of 50 nm or less. A method for producing the thermally conducting composition includes the steps of preparing a dispersion by adding water or a mixed solvent of water and a hydrophilic solvent to (A) a cellulose nanofiber and (B) at least one type of an inorganic powder selected from a metal oxide and a diamond having an average particle diameter of 50 nm or less; and removing the water or the mixed solvent of water and a hydrophilic solvent from the dispersion. The present invention provides a thermally conducting composition that utilizes a cellulose nanofiber and an inorganic powder having the thermal conductivity at a nano-scale size, can improve the thermal conductivity significantly, and further can have properties such as anisotropy and transparency, and a method for producing the same.

Description

TECHNICAL FIELD[0001]The present invention relates to a thermally conducting composition and a method for producing the same. Specifically, the present invention relates to a thermally conducting composition that can control anisotropy, has characteristics such as high transparency and high flexibility, and is useful as a sheet, a film or a coating, or the like. The present invention also relates to a method for producing the thermally conducting composition.BACKGROUND ART[0002]As thermally conducting materials and thermally radiating materials, grease, a polymer film and a polymer sheet, etc. having a highly thermally conducting fine inorganic particle are important materials and technical fields of the industry. These thermally conducting films or sheets generally contain a large amount of highly thermally conducting material to exhibit high function. Examples of the highly thermally conducting materials include metal silicon, alumina, magnesium oxide, aluminum oxide, boron nitrid...

Claims

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Application Information

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IPC IPC(8): C09K5/14C08J5/18C08L1/02C08K3/04C09D7/12C08K3/22C08J7/043C08J7/044C09D7/61C09D7/65
CPCC09K5/14C09D7/1291C09D7/1216C09D7/1266C08K3/22C08J2301/02C08K3/04C08J5/18C08K2003/2227C08K2201/003C08L2205/16C08L1/02B32B9/00B32B23/02C09D101/02C08L101/00B32B9/04B32B23/00B32B2307/30B32B2307/302B32B2307/50C08L67/00H01B3/004H01B3/10H01B3/52C08J2401/02C08K3/042C08K9/12C09D7/69C09D7/67C09D7/61C09D7/70C09D5/24C08J7/0427C09D7/65C08J7/043C08J7/044C09D167/00
Inventor KONAGAYA, SHIGEJISHIBUYA, HITOSHISARUYAMA, TOSHIO
Owner NAGOYA UNIVERSITY