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Cellulose nanofibers and method for producing same, composite resin composition, molded body

A nanofiber and cellulose technology, which is applied to artificial filaments made of cellulose derivatives, plant fibers, fiber treatment, etc., can solve the problem of low resin reinforcement effect and achieve high modification rate

Inactive Publication Date: 2014-01-22
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that the reinforcing effect of the resin is low

Method used

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  • Cellulose nanofibers and method for producing same, composite resin composition, molded body
  • Cellulose nanofibers and method for producing same, composite resin composition, molded body
  • Cellulose nanofibers and method for producing same, composite resin composition, molded body

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Effect test

no. 1 Embodiment approach

[0078] In the method for producing cellulose nanofibers according to this embodiment, the cellulose nanofibers have an average degree of polymerization of 600 to 30,000, an aspect ratio of 20 to 10,000, and an average diameter of 1 nm to 800 nm. The method for producing the cellulose nanofibers includes the step of esterifying the hydroxyl groups of the cellulose nanofibers with vinyl carboxylate for the cellulose nanofibers having an Iβ-type crystallization peak in the X-ray diffraction pattern. grooming.

[0079] For example, when the cellulose raw material is opened in a solution containing an ionic liquid, the viscosity of the solution in which the cellulose raw material is dissolved increases. Therefore, the present embodiment is a method in which the following steps are performed in two steps: a step of hydrolyzing a cellulose part with low crystallinity with sulfuric acid in order to lower the viscosity, thereby performing a fiber opening treatment; and chemical modific...

no. 2 Embodiment approach

[0096] The method for producing cellulose nanofibers according to the present embodiment includes the steps of swelling a cellulose raw material in a solution containing an ionic liquid, adding a modifier as it is, followed by filtering and washing.

[0097] The method for producing cellulose nanofibers according to this embodiment is a method in which the following steps are performed in one step: a step of opening cellulose raw materials in a solution containing an ionic liquid; and treating the cellulose with vinyl carboxylate. The process of chemically modifying the hydroxyl group of the nanofiber (hereinafter referred to as the one-step method.).

[0098] Compared with the conventional two-step method, the one-step method according to this embodiment has fewer steps, and thus is advantageous in terms of management and cost. In addition, the amount of solvent used is small, and environmental load can be reduced.

[0099] The cellulose raw material and the ionic liquid-con...

Embodiment 1

[0112] Put 2g of filter paper cut into a 3mm square with scissors into a 200ml flask, further add 50ml of N,N-dimethylacetamide and 60g of ionic liquid 1-butyl-3-methylimidazolium chloride, and carry out Stirred. Next, after further adding sulfuric acid aqueous solution and stirring, it filtered and washed the solid content. This was processed with a homogenizer to obtain cellulose nanofibers. The cellulose nanofibers were acetylated by reacting with vinyl acetate in DMF (dimethylformamide) for 45 minutes, and washed to obtain acetylated cellulose nanofibers by a two-step method. The obtained acetylated cellulose nanofibers had a degree of modification of 1.7 and a thermal decomposition temperature of 350°C.

[0113] Next, polycarbonate (PC; manufactured by Teijin Chemicals: Panlite L-1225L, refractive index 1.58) and acetylated cellulose nanofibers dissolved in methylene chloride in advance were mixed in methylene chloride and dried. , thereby obtaining a polycarbonate com...

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Abstract

These cellulose nanofibers have an average degree of polymerization of 600 to 30,000, an aspect ratio of 20 to 10,000, an average diameter of 1 to 800 nm, and an X-ray diffraction pattern with an Iss-type crystal peak. Further, a hydroxyl group has been ester modified, and the degree of modification with respect to the entire hydroxyl group is at least 1.0.

Description

technical field [0001] The present invention relates to cellulose nanofibers, a method for producing the same, a composite resin composition, and a molded body. [0002] This application claims the priority based on Japanese Patent Application No. 2011-185041 for which it applied to Japan on August 26, 2011, and uses the content here. Background technique [0003] In the past, cellulose nanofibers have been used as reinforcement materials for polymer composites. [0004] Usually, such cellulose nanofibers are produced by mechanically shearing cellulose fibers such as pulp, but in recent years, a method of opening (fibrillating) fiber raw materials using ionic liquids has been proposed (Patent Document 1). [0005] The method described in Patent Document 1 does not require sufficient mechanical shearing, so there is no risk of damage to the fibers and cellulose nanofibers with high strength and high aspect ratio can be easily obtained. In these respects, the method described...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/20C08B3/06C08J3/12C08L1/10C08L101/00
CPCC08B3/20C08L1/10C08L101/00C08B1/003C08B3/08C08L1/12D06M13/203D06M23/10C08L2205/16D06M2101/06C08J5/005C08L69/00B82Y30/00D01F2/28C08B3/06
Inventor 白水航平林莲贞
Owner OLYMPUS CORP
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