Process for production of fine cellulose fiber dispersion

A technology for fine cellulose and cellulose fibers, which is applied in the field of manufacturing fine cellulose fiber dispersions, can solve the problems of difficulty in adjusting the composition ratio of resin and cellulose fibers, difficulty in separately manufacturing composites, and complicated manufacturing processes, and achieves liquid stability. Excellent properties, excellent film-forming properties and moldability, and good production efficiency

Active Publication Date: 2015-04-22
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, in the methods described in these documents, it is necessary to manufacture non-woven fabrics of cellulose fibers in advance before manufacturing composites, and the manufacturing process is complicated, so it is not necessarily a method that can satisfy industrialization.
In addition, in this method, the composite is obtained by impregnating the resin, so it is difficult to adjust the composition ratio of the resin to the cellulose fiber, and it is difficult to manufacture a composite with desired characteristics according to the application.
Further, since the composite obtained by this method has a layered structure of a resin layer and a cellulose fiber layer, the linear expansion coefficients of these layers are different, which may cause interlayer peeling when heated.

Method used

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  • Process for production of fine cellulose fiber dispersion
  • Process for production of fine cellulose fiber dispersion
  • Process for production of fine cellulose fiber dispersion

Examples

Experimental program
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Effect test

Embodiment

[0298] Hereinafter, the present invention will be described more concretely by way of production examples, examples, and comparative examples, but the present invention is not limited to the following examples unless the gist thereof is exceeded.

[0299] The measurement methods of various physical properties of the fine cellulose fiber dispersion liquid and the cellulose fiber composite are as follows.

[0300] [Dispersion stability test of fine cellulose fiber dispersion]

[0301] The fine cellulose fiber dispersion was prepared, and the presence or absence of sedimentation immediately after the preparation and after standing at room temperature for 10 days was visually evaluated according to the following criteria. "No sedimentation observed at all" was marked as AA, "almost no sedimentation was observed" was marked as A, "settling was slightly observed, or aggregation was observed in a part of the dispersion" was marked as B, and "observed Very much settling, or aggregate...

manufacture example 1

[0317] Wood flour (Miyashita Wood, Measong 100, particle size 50 to 250 μm, average particle size 138 μm) was degreased with a 2% by weight sodium carbonate aqueous solution at 80° C. for 6 hours. After washing with deionized water, delignification was performed at 80° C. for 5.5 hours using sodium chlorite under acidic acetic acid. After washing this with deionized water, it was immersed in a 5% by weight potassium hydroxide aqueous solution for 16 hours to perform a dehemicellulose treatment. This was washed with deionized water to obtain cellulose fibers (number average fiber diameter: 60 μm).

manufacture example 2

[0319] In Production Example 1, the cellulose fibers subjected to the dehemicellulose treatment and washed with deionized water were dehydrated by filtration. This was dispersed in acetic acid and filtered, and this filtration step was performed three times to replace water with acetic acid. 25 ml of toluene, 20 ml of acetic acid, and 0.1 ml of a 60% perchloric acid aqueous solution were mixed, and 1 g of cellulose fibers substituted with acetic acid was added to the mixture, followed by 1.3 ml of acetic anhydride, and the reaction was carried out for 1 hour while stirring. After the reaction, the reaction solution was filtered and washed with methanol and deionized water in sequence.

[0320] The chemical modification rate of the obtained acetylated cellulose fibers was calculated based on the above-mentioned measuring method of the chemical modification rate and found to be 16 mol%.

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Abstract

The invention is to provide a method for producing a microfibrillated cellulose fiber dispersion capable of giving a composite of microfibrillated cellulose fibers and a resin with high productivity, in which the dispersion contains microfibrillated cellulose fibers uniformly dispersed in an organic solvent and contains at least one of a resin and a resin precursor and is excellent in liquid stability and film formability. The invention relates to a method for producing a microfibrillated cellulose fiber dispersion containing microfibrillated cellulose fibers, at least one of a resin and a resin precursor, and an organic solvent, and the method comprises a fibrillation step of fibrillating cellulose fibers in a starting material dispersion containing cellulose fibers, at least one of a resin and a resin precursor, and an organic solvent, to obtain microfibrillated cellulose fibers.

Description

technical field [0001] The present invention relates to a method for producing a fine cellulose fiber dispersion. More specifically, the present invention relates to a method for producing a fine cellulose fiber dispersion by defibrating cellulose fibers in the presence of at least one of a resin and a resin precursor and an organic solvent. Background technique [0002] In recent years, composite materials using microfibers of cellulose including bacterial cellulose have been actively studied. Since cellulose has a rigid structure derived from intramolecular hydrogen bonds, it can be compounded with a resin or the like to obtain a composite material exhibiting low linear expansion. [0003] So far, various researches have been carried out on composite materials containing cellulose. For example, Patent Documents 1 to 3 disclose that a liquid resin precursor can be impregnated into a nonwoven fabric or gel of cellulose fibers to produce Technology for composites of cellulo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08J3/02C08J5/06C08L101/00
CPCC08J5/045C08L1/08C08J2301/02Y10T428/31971C08J3/09C08J5/24C08L1/02C08L2205/16C08L1/12C08H8/00C08L101/00C08L63/04C08L29/04
Inventor 清水尧纪赤井日出子平井孝好太田员正
Owner MITSUBISHI RAYON CO LTD
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