Modified cellulose fine fibers and method for producing same

A technology for modifying cellulose and its manufacturing method, which is applied in the field of modifying cellulose microfibers and its manufacturing, which can solve the problems of low dispersibility of organic media, heavy environmental burden, and difficult drainage treatment, so as to improve affinity and reduce damage Less, improve the effect of disintegration and modification rate

Inactive Publication Date: 2018-07-31
FUTAMURA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, although the cellulose nanofibers obtained by the TEMPO oxidation method have high hydrophilicity and water dispersibility, their dispersibility in organic media is low.
In addition, due to the use of an expensive TEMPO catalyst and a large amount of alkali, the economy is low, wastewater treatment is also difficult, and the burden on the environment is also large

Method used

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  • Modified cellulose fine fibers and method for producing same
  • Modified cellulose fine fibers and method for producing same
  • Modified cellulose fine fibers and method for producing same

Examples

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Effect test

preparation example Construction

[0092] In the preparation method of the reactive fiber dissolving liquid, the above-mentioned catalyst, the above-mentioned monocarboxylic anhydride, and the above-mentioned solvent can be mixed in advance by stirring or the like, and the monocarboxylic anhydride can be uniformly dissolved in the above-mentioned catalyst and the above-mentioned solvent.

[0093] Since the obtained reactive fibrinolysis solution has a high impregnation property to cellulose, by adding and mixing cellulose to the reactive fiber solution, the reactive solution penetrates between the microfibrils, and the microfibrils present in the By modifying the hydroxyl groups on the surface of the fibrils, the modification and fibrillation of cellulose can be performed simultaneously.

[0094] In detail, the chemical defibrating method may be a method in which cellulose is mixed in a reactive defibrating solution and left to stand for more than 1 hour to perform esterification. After mixing, the cellulose can...

Embodiment 1

[0148] Put 3 g of pyridine, 7 g of DMSO, and 1.3 g of propionic anhydride into a 20 ml sample bottle, and stir with a stirrer until the mixture is uniformly mixed. Next, after adding 0.3 g of cellulose pulp and stirring for another 24 hours, pyridine, DMSO, and residual propionic anhydride were removed by washing with a mixed solution of acetone and water. The solid content was recovered, and the average degree of substitution was measured for the obtained modified cellulose fine fibers, the modified functional group was confirmed by FT-IR analysis, the shape was observed by scanning electron microscope (SEM), the crystallinity was measured by XRD analysis, and the degree of fiber disintegration and Solvent dispersibility was evaluated. The results of FT-IR analysis are shown in figure 1 , the SEM photographs are shown in figure 2 . As a result of SEM observation, the average fiber diameter of the fibers was 30 nm, and the average fiber length was 9.5 μm. It should be not...

Embodiment 2

[0150] 3 g of pyridine, 7 g of DMAc, and 1 g of acetic anhydride were placed in a 20 ml sample bottle, and the same procedure as in Example 1 was carried out to obtain modified cellulose fine fibers. The obtained modified cellulose fine fibers were evaluated in the same manner as in Example 1. The results of FT-IR analysis are shown in image 3 , the SEM photographs are shown in Figure 4 . As a result of SEM observation, the average fiber diameter of the fibers was 93 nm, and the average fiber length was 12.3 μm. It should be noted that the saturated absorption rate of the pulp in the defibrating solution was 28 times.

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Abstract

Cellulose is impregnated with a reactive spreading solution containing a catalyst that includes a base catalyst or an organic acid catalyst, a monobasic carboxylic acid anhydride, and an aprotic solvent having a donor number of 26 or higher; the cellulose is esterified and chemically spread; and modified cellulose fine fibers are produced. Through this method, modified cellulose fine fibers that are nanosized and that have a high degree of crystallization, little damage to the fiber shape, a high aspect ratio, and exceptional dispersibility in organic solvents are obtained easily and efficiently without forceful crushing. The catalyst may include pyridines. The monobasic carboxylic acid anhydride may be a C2-4 aliphatic monocarboxylic acid anhydride. The resulting modified cellulose fine fibers are modified by the monobasic carboxylic acid anhydride, have a degree of crystallization of 70% or higher, have an average fiber diameter of 20-800 nm, and have an average fiber length of 1-200[mu]m.

Description

technical field [0001] The present invention relates to a modified cellulose fine fiber whose surface is esterified with a monocarboxylic acid anhydride and a method for producing the same. Background technique [0002] Cellulose fibers (cell wall units) are aggregates of fine cellulose fibers (microfibrils). Cellulose microfibers are attracting attention as a reinforcing agent because they have mechanical properties comparable to those of steel and have a nanostructure with a diameter of about 30 nm. However, cellulose fine fibers are bundled by hydrogen bonds between fibers, and in order to take out the fine fibers, it is necessary to break the hydrogen bonds and separate the microfibrils (fibrillation). Therefore, such separation of microfibrils is called defibration, and a mechanical defibrillation method in which severe physical force is applied has been developed as a defibration method for cellulose fine fibers (cellulose nanofibers). [0003] The mechanical fibrill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/06C08B3/08C08B3/10C08B3/20
CPCC08B3/08C08B3/10C08B3/20C08B3/06C08J5/249C08J5/248C08L1/10C08L2205/16
Inventor 林莲贞丸田彩子
Owner FUTAMURA CHEM
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