Method for producing cellulose nanofibers

一种纳米纤维、制造方法的技术，应用在纤维素纸浆后处理、纤维素纸浆后处理改性、纤维原料处理等方向，能够解决无法均匀混合、分散液粘度过高等问题，达到流动性和透明性优异的效果

Inactive Publication Date: 2014-05-28
NIPPON PAPER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the cellulose nanofiber dispersion is mixed with a paint containing a pigment and a binder and applied to paper, etc., there is a problem that if the viscosity of the dispersion is too high, it cannot be uniformly mixed in the paint.

Method used

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  • Method for producing cellulose nanofibers
  • Method for producing cellulose nanofibers
  • Method for producing cellulose nanofibers

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The type of plant material used in the preparation of DKP is not particularly limited, and wood chips of coniferous or broad-leaved trees generally used for pulp production, kenaf, hemp, rice, bagasse, bamboo, and the like can be used.

[0025] The DKP used in the present invention is characterized in that hydrolysis treatment is performed as a pretreatment of kraft cooking. As one of the hydrolysis treatment methods, there is a direct steam blowing method. In this method, it is considered that the organic acid in the plant material is liberated by high-temperature steam blown into the plant material, and then hydrolyzed by the action of the acid.

[0026] The conditions of the hydrolysis treatment are not particularly limited, for example, it can be carried out as follows, that is, using an autoclave or the like, the liquid phase or vapor phase of water or 2% by mass or less of an inorganic acid is contacted with a plant material such as wood chips, and the temperature...

Embodiment 1

[0110] To a rotary autoclave with a capacity of 2.4 L, 300 g of broad-leaved wood chips with an absolute dry mass were charged, and water was added so that the liquid ratio would be 2 L / kg. After holding at 170° C. for 30 minutes to carry out hydrolysis treatment, a neutralizing solution was added, and neutralization treatment was carried out at 155° C. for 15 minutes. The neutralizing solution is prepared by mixing sodium hydroxide and sodium sulfide in the form of active alkali 11% (relative to sawdust mass), degree of sulfidation 25%, and liquid ratio 2.5L / kg. After the neutralization treatment, extract the liquid from the autoclave, add cooking liquid (prepared by mixing sodium hydroxide and sodium sulfide in the form of active alkali 9% (relative to sawdust mass), degree of sulfidation 25%, and liquid ratio 2.5L / kg), in Cook at 160°C until the H factor becomes 830 (preparation of DKP).

[0111] After oxygen delignification of cooked green pulp, it was bleached in the seq...

Embodiment 2

[0122] Into a 2.4 L volume rotary autoclave, 300 g of coniferous wood chips in an absolute dry mass were charged, and water was added so that the liquid ratio was 3.2 L / kg. After maintaining at 170° C. for 30 minutes for hydrolysis treatment, a neutralizing solution was added and neutralized at 155° C. for 15 minutes. The neutralizing solution is prepared by mixing sodium hydroxide and sodium sulfide in the form of active alkali 13% (relative to the mass of wood chips), sulfidation degree 25%, and liquid ratio 3.2L / kg. After the neutralization treatment, extract the liquid from the autoclave, add cooking liquid (prepared by mixing sodium hydroxide and sodium sulfide in the form of active alkali 11% (relative to sawdust mass), degree of sulfidation 25%, and liquid ratio 3.2L / kg), in Cook at 170°C until the H factor becomes 1800 (preparation of DKP).

[0123] After oxygen delignification of the cooked green pulp, it is bleached in the order of D0-E / P-D1 as ECF bleaching. Oxyge...

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Abstract

Provided is a method which is capable of producing a cellulose nanofiber dispersion liquid that has a low viscosity and excellent fluidity even at a high concentration, while exhibiting excellent transparency. In a method for producing cellulose nanofibers, wherein a cellulose-based starting material is oxidized in water using an oxidant in the presence of an N-oxyl compound and a compound that is selected from the group consisting of a bromide, an iodide and a mixture of a bromide and an iodide and the thus-obtained oxidized cellulose is fibrillated and dispersed, pulp which is obtained by carrying out kraft cooking after a hydrolysis process is used as the cellulose-based starting material.

Description

technical field [0001] The present invention relates to using pulp obtained by kraft cooking after hydrolysis treatment (hereinafter, sometimes referred to as "dissolving pulp obtained by the kraft process" or "DKP") as a cellulosic raw material, and using N - A method of producing oxidized cellulose by oxidizing the cellulose-based raw material with an oxygen compound as a catalyst, followed by defibrating and dispersing the oxidized cellulose to produce cellulose nanofibers. Background technique [0002] It is known that if a cellulose-based raw material is treated with a catalytic amount of 2,2,6,6-tetramethyl-1-piperidine-N-oxyl radical (hereinafter referred to as TEMPO) and an inexpensive oxidant sodium hypochlorite When treated, carboxyl groups can be efficiently introduced on the surface of cellulose microfibrils, and high-viscosity and transparent cellulose nanofibrils can be prepared by simple mechanical treatment such as mixing the cellulose-based raw materials int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02D21H11/18D21H11/20
CPCC08B15/02C08B15/04D21C3/18D21H11/18D21H11/20D21H27/10D21C3/02D21C9/1036D21C9/005D21C9/007D21C1/02
Inventor 辻志穗深泽诚彦宫胁正一饭森武志
Owner NIPPON PAPER IND CO LTD
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