Sheet-like article and method for making the same

a technology of sheet paper and paper, applied in the field of sheet paper, can solve the problems of difficult to obtain the full performance of carbon fiber, difficult to achieve the best performance characteristics of carbon fiber, and agglomeration of carbon fiber, and achieve the effect of good dispersibility in water, dense and uniform network structur

Inactive Publication Date: 2010-08-19
TOKUSHU PAPER MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a sheet-like article that can be used as an ultrafine filter or a catalyst carrier. The article contains main fibers, such as cellulose fibers, which can be either natural or synthetic. These fibers can be used alone or in combination with other fibers like bamboo or carbon fibers. The article also contains carbon nanotubes (CNTs) or carbon nanohybrids (CNHs) which form a network structure on the surface of the fibers. The CNTs or CNHs are fixed onto the fibers and form a dense and uniform network structure. The article can be made using a wet papermaking process with the addition of various additives such as strength agents, polymers, and fixing agents. The ultrafine voids formed by the CNTs or CNHs make the article useful as an ultrafine filter or a catalyst carrier.

Problems solved by technology

The technical problem addressed in this patent text is the difficulty of forming a sheet material containing carbon nanotubes or carbon nanohorns that exhibits effective electrical characteristics suitable for various uses such as electrically conductive material, electromagnetic shielding, and microwave heating element. Existing methods have failed to achieve a satisfactory network of carbon fibers or a sufficient amount of carbon fibers in the sheet, resulting in reduced performance characteristics. In addition, some methods have resulted in the formation of agglomerates or failed to sufficiently cover the cellulose fibers with carbon fibers.

Method used

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  • Sheet-like article and method for making the same
  • Sheet-like article and method for making the same
  • Sheet-like article and method for making the same

Examples

Experimental program
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Effect test

example 1

[0057]Fifty percent by mass of hardwood bleached kraft pulp and 50 mass % of softwood bleached kraft pulp were dispersed in water and beaten in a double disc refiner to prepare a pulp slurry having a CSF freeness of 350 ml. Cationic starch (Neotack L-1, from Nihon Syokuhin Kako Co., Ltd.) was mixed therein in an amount of 2 mass % relative to the pulp mass. The CNT dispersion of anionic surfactant type prepared by the dispersing method 1 was then mixed therein to give a slurry having a CNT solid content of 5 mass % relative to the pulp mass. The slurry was converted into a sheet-like article having a grammage of 100 g / m2 by a wet papermaking process using a wire cloth.

example 2

[0058]A sheet-like article having a grammage of 100 g / m2 was made in the same manner as in Example 1, except for replacing the CNT dispersion of anionic surfactant type obtained by the dispersing method 1 with the CNT dispersion of cationic surfactant type obtained by the dispersing method 2 and using 3 mass % of carboxymethyl cellulose in place of the cationic starch.

example 3

[0059]A sheet-like article having a grammage of 100 g / m2 was made in the same manner as in Example 1, except for replacing the CNT dispersion of anionic surfactant type obtained by the dispersing method 1 with the CNT dispersion of physical treatment type obtained by the dispersing method 3.

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Abstract

A sheet-like article including fibers and carbon nanotubes and/or carbon nanohorns adhering to the surface of the fibers in a uniformly dispersed state without agglomeration to form a network structure on the fibers. The sheet-like article is preferably made by converting the fibers and a dispersion of the carbon nanotubes and/or carbon nanohorns by a wet papermaking process. To use cellulose fibers as main fibers provides a good sheet-like article.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Owner TOKUSHU PAPER MFG CO LTD
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