Cellulose nanofibers

一种纳米纤维、纤维素的技术，应用在纤维素纸浆后处理改性、纤维原料处理、纺织品和造纸等方向，能够解决微纤维化不充分、难以得到片层强度、高纳米纤维等问题

Inactive Publication Date: 2012-09-05
NIPPON PAPER IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned above, under the above conditions, since the pulp is not given a high shear rate, the defibration of the shear ratio fiber proceeds preferentially, so the microfibrillation (fiber nanometerization) is insufficient, and it is difficult to obtain a high sheet strength. nanofibers

Method used

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  • Cellulose nanofibers
  • Cellulose nanofibers
  • Cellulose nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] The slurry of coniferous unbleached kraft pulp (NUKP) (aqueous suspension with a pulp slurry concentration of 2% by weight) was passed through a single-disk refiner (manufactured by Kumagai Riki Industry Co., Ltd.), and the refiner treatment was repeated until the Canadian Standard Freeness (CSF ) value is 100mL or less. Next, the obtained slurry was dehydrated using a centrifugal dehydrator (manufactured by Kokusan Co., Ltd.) at 2000 rpm for 15 minutes, and concentrated to a pulp concentration of 25% by weight. The obtained water-containing pulp was charged into a twin-screw kneader (KZW manufactured by Technovel Co., Ltd.), and subjected to defibration treatment. The defibrating conditions by the twin-screw kneader are as follows.

[0117] [Defibration condition]

[0118] Screw diameter: 15mm

[0119] Screw revolutions: 2000rpm (screw peripheral speed: 94.2m / min)

[0120] Defibering time: 150 g of coniferous unbleached kraft pulp was defibrated under the treatment...

Embodiment 2

[0132] A sheet was produced in the same manner as in Example 1 except that the number of defibrating treatments was changed to four (4 passes). The physical properties of the obtained sheet are shown in Table 1.

Embodiment 3

[0134] Sheets were produced in the same manner as in Example 1, except that softwood unbleached kraft pulp (NUKP) was replaced with softwood unbleached kraft pulp (NUKP). The physical properties of the obtained sheet are shown in Table 1.

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Abstract

Provided are a novel process for producing cellulose nanofibers, and novel cellulose nanofibers. The process comprises fibrillating a pulp with a single-screw or multi-screw kneading machine in the presence of water to produce cellulose nanofibers, wherein the fibrillation is conducted in a manner such that the peripheral speed of the single-screw or multi-screw kneading machine is 45 m / min. Thus, cellulose nanofibers superior in both water filtration efficiency and sheet strength, which have been thought to be inconsistent properties, are obtained.

Description

technical field [0001] The present invention relates to cellulose nanofibers. Background technique [0002] Cellulose nanofibers are the basic skeleton material (basic element) of all plants, and in the cell wall of plants, they are in the form of cellulose nanofibers in which a plurality of cellulose microfibers (single cellulose nanofibers) with a width of about 4 nm are bundled exist. [0003] Various methods are known for producing cellulose nanofibers from fibers of plants or the like. Usually, pulp and other cellulose fiber-containing materials can be pulverized by using a refiner, a grinder (mortar mill), a twin-screw kneader (twin-screw extruder), a high-pressure homogenizer (homogenizer), etc. , Beating for defibration, miniaturization and manufacture. [0004] It is known that when the aggregate of cellulose nanofibers obtained by the above method is formed into a sheet, or when the cellulose nanofibers are mixed with a resin to form a resin composite, usually t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21D1/34D21H11/18
CPCD21D1/34D21H11/18
Inventor 矢野浩之桥本唯史佐藤明弘
Owner NIPPON PAPER IND CO LTD
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