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Production method for dry solid containing fine cellulose fibers, dry solid containing fine cellulose fibers, redispersion of fine cellulose fibers

A technology of fine cellulose and solid matter, applied in the field of fine cellulose fiber redispersion, can solve the problems of increased cost and limited use of CNF, and achieve good redispersibility, excellent redispersibility, and excellent viscosity characteristics Effect

Pending Publication Date: 2021-06-08
MARUSUMI PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This aqueous dispersion contains several to several hundred times the weight of water relative to CNF in order to ensure dispersion stability, and there are problems such as increased cost due to increase in transportation energy and storage space, and limitations in the use of CNF. various problems

Method used

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  • Production method for dry solid containing fine cellulose fibers, dry solid containing fine cellulose fibers, redispersion of fine cellulose fibers
  • Production method for dry solid containing fine cellulose fibers, dry solid containing fine cellulose fibers, redispersion of fine cellulose fibers
  • Production method for dry solid containing fine cellulose fibers, dry solid containing fine cellulose fibers, redispersion of fine cellulose fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175]

[0176] Softwood kraft pulp (NBKP manufactured by Marusumi Paper Co., Ltd.) was used. Hereinafter, only NBKP used in the experiment will be described as pulp. The pulp was washed with a large amount of pure water, drained with a 200-mesh sieve, and used for the experiment after measuring the solid content concentration.

[0177] (chemical treatment process)

[0178] The pulp was added to the reaction liquid prepared as follows and stirred into a paste. In addition, the process of adding pulp to a reaction liquid and making it into a paste corresponds to the contact process of the chemical treatment process of this embodiment.

[0179] (Preparation process of reaction solution)

[0180] The sulfonating agent and urea and / or its derivatives were prepared so as to have the following solid content concentrations.

[0181] In the experiment, sulfamic acid (purity: 98.5%, manufactured by Fuso Chemical Industry Co., Ltd.) was used as a sulfonating agent, and urea soluti...

Embodiment 2

[0226] In a drying process, it implemented similarly to Example 1 except having heat-dried with the dryer which set the temperature of a thermostat to 40 degreeC.

Embodiment 3

[0228] In the preparation process of the reaction liquid, the reaction liquid adjusted to sulfamic acid / urea ratio ((g / L) / (g / L))=200 / 200 was used, so that sulfamic acid It carried out similarly to Example 1 except having prepared so that it may be 1000 weight part, and urea shall be 1000 weight part.

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Abstract

Provided are: a dry solid that contains fine cellulose fibers and has excellent redispersibility in solvents such as water; a simple production method for a dry solid that contains fine cellulose fibers; and a redispersion of fine cellulose fibers that has excellent transparency and viscometric properties. According to one embodiment of the present invention, the dry solid that contains fine cellulose fibers contains fine cellulose fibers into which at least 0.5 mmol / g of sulfo-group-derived sulfur has been introduced. The production method for a dry solid that contains fine cellulose fibers includes a step for drying at low pressure and a comparatively low temperature. The redispersion of fine cellulose fibers includes the redispersion of fine cellulose fibers and water and has excellent redispersion characteristics in terms of transparency, viscometric properties, and precipitation characteristics.

Description

technical field [0001] The present invention relates to a method for producing a fine cellulose fiber-containing dry solid material excellent in redispersibility with water, a fine cellulose fiber-containing dry solid material, and a fine cellulose fiber redispersion liquid. Background technique [0002] Cellulose nanofibers (CNF) are tiny fibers with a fiber width of nanometers and a fiber length of several hundred nm by nano-processing (mechanical fibrillation, TEMPO catalyst oxidation, etc.) of plant-derived cellulose. Since CNF has light weight, high elasticity, high strength, and low linear thermal expansion, composite materials containing CNF are expected to be used not only in the industrial field but also in various fields such as the food field and the medical field. [0003] CNF is obtained in a water-dispersed state because it is usually produced from plant-derived cellulose (pulp, etc.) in a water-dispersed state. This aqueous dispersion contains several to seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/16C08B5/00
CPCC08B5/14C08L1/16
Inventor 日浅祥
Owner MARUSUMI PAPER
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