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Fine cellulose fiber sheet

a technology of cellulose fiber and cellulose fiber, applied in the field of fine cellulose fiber sheet, can solve the problems of easy cleavage of hydrogen bonds, easy collapse of sheet structure, and extreme disadvantage of techniqu

Inactive Publication Date: 2019-08-22
ASAHI KASEI FIBERS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The resulting sheet achieves enhanced water resistance, solvent resistance, adhesion, and air permeability resistance, while maintaining mechanical strength and handling ease, and is produced with a low environmental impact.

Problems solved by technology

Since fine cellulose fiber sheets conventionally retain a sheet structure by hydrogen bonding between fine cellulose short fibers, the hydrogen bonds are easily cleaved and the sheet structure easily collapses as a result of contact with water.
However, this technique is extremely disadvantageous from the viewpoints of industrial production and environmental issues since it uses an organic solvent.
Even if a water-soluble or water-dispersible water resistance agent is used as a way of solving the aforementioned problems associated with organic solvents, there is an extremely high likelihood of the sheet tearing during treatment due to inadequate wet paper strength.
Moreover, it is theoretically difficult to uniformly distribute the water resistance agent in the sheet, making this technique disadvantageous in terms of improving water resistance and other properties.
Namely, there is currently no technology for producing a fine cellulose fiber sheet in which multiple properties and functions, including water resistance, are controlled.

Method used

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  • Fine cellulose fiber sheet

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0304]Linter pulp was immersed in water to a concentration of 10% by weight, subjected to heat treatment for 4 hours at 130° C. in an autoclave and the resulting resin pulp was rinsed several times with water to obtain a wet pulp immersed in water.

[0305]The resin pulp was dispersed in water (40 L) to a solid content of 1.5% by weight, and the 400 L of dispersion were subjected to beating treatment for 20 minutes using the Model SDR14 Lab Refiner (pressurized disk type) manufactured by Aikawa Iron Works Co., Ltd. for the disc refiner device at a clearance between disks of 1 mm. Continuing therefrom, beating treatment was continued under conditions of reducing the disk clearance to nearly zero. Samples were collected over time, and when CSF values were evaluated for the slurry samples according to the Canadian standard pulp freeness test method defined in JIS P 8121 (to be referred to as the CSF method), CSF values were confirmed to demonstrate a tendency by which they decreased over ...

example 2

[0310]Diameter reduction, papermaking slurry preparation, papermaking, drying and heat treatment were carried out in the same manner as Example 1 with the exception of making the added amount of cationic blocked polyisocyanate to be 6.3 g (10% by weight based on the weight of the cellulose solid fraction to obtain S2. Papermaking ability, wet / dry strength ratio, wet / dry strength ratio after solvent immersion and block polyisocyanate distribution were all superior. In addition, a graph indicating the relationship of variations in C1 / C2 in the direction of depth for one of the four sample sites of S2 analyzed by TOF-SIMS is shown in FIG. 1. Although the C1 / C2 ratio was indicated to be large only on the uppermost surface of the upper portion of the sheet, it subsequently became stable and demonstrated a value of C1 / C2≈0.2. On the basis thereof, it can be said that, although blocked polyisocyanate is present in comparatively large amounts on the uppermost surface of the sheet, it is dis...

example 3

[0311]Diameter reduction, papermaking slurry preparation, papermaking, drying and heat treatment were carried out in the same manner as Example 1 with the exception of making the added amount of cationic blocked polyisocyanate to be 19 g (30% by weight based on the weight of the cellulose solid fraction) to obtain S3. Papermaking ability, wet / dry strength ratio, wet / dry strength ratio after solvent immersion and blocked polyisocyanate distribution were all superior.

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Abstract

The present invention provides a fine cellulose fiber sheet, of which various properties and functions such as paper making ability, solvent resistance, adhesion, functionalization agent immobilization, surface zeta potential, hydrophilicity, hydrophobicity, and air permeation resistance are finely controlled, through a process having low environmental impact. A fine cellulose fiber sheet according to the present invention fulfills all of the following requirements (1) to (3): (1) comprises fine cellulose fibers having an average fiber diameter of 2 nm or greater and 1000 nm or less; (2) the weight ratio of the fine cellulose fibers is 50 wt % or greater and 99 wt % or less; and (3) the block polyisocyanate aggregate content as a weight ratio is 1 to 100 wt % of the weight of the fine cellulose fibers.

Description

TECHNICAL FIELD[0001]The present invention relates to a fine cellulose fiber sheet containing a blocked polyisocyanate aggregate in the sheet. More particularly, the present invention relates to a sheet in which a crosslinked structure is formed by all or a portion of a blocked polyisocyanate chemically bonding with fine cellulose fibers as a result of heat-treating the fine cellulose fiber sheet.BACKGROUND ART[0002]Attention is currently being focused on fine cellulose fibers in which cellulose-based fibers are beaten and crushed at a high level to increase their fineness (fibrillate) to a fiber diameter of 1 μm or less. Sheets composed of fine cellulose fibers produced in a process consisting of forming a papermaking slurry of these fine cellulose fibers into paper followed by drying are expected to be applied to a wide range of applications in addition to conventional paper. For example, sheets controlled to be porous can be used as filters or membranes having extremely fine pore...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/08C12M1/00B32B23/08C08J7/04B01D71/80B32B27/30F28F21/00D21H17/46D21H19/24D21H19/34C09D101/02C09K5/14D21H17/07D21H11/18B01D71/10D21H21/52
CPCD21H17/08C12M23/20B32B23/08C08J7/047B01D71/80B32B27/306F28F21/00D21H17/46D21H19/24D21H19/34C09D101/02C09K5/14D21H17/07D21H11/18B01D71/10D21H21/52B32B2307/73B32B2554/00B32B2307/7242B32B2307/7265C08J2401/02C08J2300/00B01D69/12C08J7/0427
Inventor KAWAHARA, KAZUFUMISATO, DAISUKEONO, HIROFUMISAITO, YAMATO
Owner ASAHI KASEI FIBERS CORPORATION
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