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Cellulose acetate film and method for producing cellulose acetate film

A technology of cellulose acetate and cellulose triacetate, which is applied in the direction of post-treatment modification of cellulose pulp, can solve the problems of white turbidity of the sheet, and achieve the effect of high transparency and excellent flexibility

Pending Publication Date: 2021-08-06
HOKKAIDO UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with cellulose fibers in these ranges, the resulting sheet tends to become cloudy

Method used

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  • Cellulose acetate film and method for producing cellulose acetate film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] (pre-processing)

[0165] As a pretreatment, 2,000 parts by weight of water was added to 40 parts by weight of powdered cellulose (PC, product name "KC flock W-50GK", manufactured by Nippon Paper Co., Ltd.), and stirred at room temperature for 1 hour. The liquid was removed by suction filtration to prepare a wet cake (PC) having a solid content concentration of about 20% by weight. This wet cake was dispersed in 2,000 parts by weight of glacial acetic acid, stirred at room temperature for 10 minutes, and deliquored by suction filtration to obtain a wet cake (PC) wetted with acetic acid. The wet cake (PC) wetted with acetic acid had a solid content concentration of about 35% by weight. The operation of redispersing the wet cake (PC) wetted with acetic acid in glacial acetic acid and deliquoring was performed twice further. The wet cake (PC) wetted with acetic acid thus obtained had a solid content concentration of about 40% by weight. In addition, the solid content co...

manufacture example 1

[0183] (1) TEMPO (2,2,6,6-tetramethyl-1-piperidine-N-oxyl) oxidation treatment of cellulose

[0184] 30 g of conifer kraft pulp was immersed in 600 g of water, and dispersed with a mixer. 0.3 g of TEMPO and 3 g of sodium bromide dissolved in 200 g of water in advance were added to the dispersed pulp slurry, and further diluted with water to make the total amount 1400 mL. The inside of the system was kept at 20° C., and an aqueous sodium hypochlorite solution was measured and added dropwise so as to be 10 mmol with respect to 1 g of cellulose. The pH began to drop from the dropwise addition, and 0.5N aqueous sodium hydroxide solution was added dropwise at any time to keep the pH of the system at 10. After 3 hours, 30 g of ethanol was added to stop the reaction. Add 0.5N hydrochloric acid to the reaction system until the pH is lowered to 2. The oxidized pulp is filtered and washed repeatedly with 0.01N hydrochloric acid or water to obtain oxidized cellulose.

[0185] (2) Addi...

manufacture example 2

[0190] Water was added to 5 g of TEMPO oxidized cellulose prepared in the same manner as in (1) of Production Example 1 to prepare a solid content concentration of 1%, and the pH was adjusted to 10 with 1N aqueous sodium hydroxide solution while stirring. Next, a transparent cellulose nanofiber dispersion liquid was obtained by micronizing using a mixer.

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Abstract

The purpose of the present disclosure is to provide a cellulose acetate film having excellent bendability and high transparency. This cellulose acetate film contains cellulose acetate having a cellulose triacetate type I crystal structure and has a light transmittance at 660nm of 70% or higher.

Description

technical field [0001] The present invention relates to a cellulose acetate film and a method for producing the cellulose acetate film. Background technique [0002] In recent years, cellulose has attracted attention as an environmentally friendly biomass material derived from nature. Cellulose is contained in the cell walls of plants, the in vitro secretions of microorganisms, and the mantle of sea squirts, and is the most abundant polysaccharide on the earth. In addition, cellulose has biodegradability, high crystallinity, and excellent stability and safety. Therefore, applications in various fields are expected. Among them, cellulose nanofibers, which are subjected to mechanical defibrillation treatment on cellulose materials such as wood pulp and refined into fibrils or microfibrils, have the characteristics of high strength and high heat resistance, and are used as additives in resins. , a variety of functional substrates have been extensively studied. [0003] As t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/20C08J5/18C08B3/06
CPCC08L1/12C08B3/06C08J5/18D21H11/20C08H8/00C08B15/04C08L1/04C08J2301/12C08L2203/16
Inventor 浦木康光金野晴男岛本周
Owner HOKKAIDO UNIVERSITY