Novel preparation method of oxidized regenerated cellulose product

A technology of regenerated cellulose and type A cellulose, applied in chemical post-treatment of cellulose/protein rayon, rayon made of viscose, etc. The problem of uncontrollable degree and unstable product performance can achieve the effect of fast solidification speed, stable fineness and reliable product performance.

Active Publication Date: 2019-02-01
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the cellulose itself is crystalline cellulose, its highly crystalline performance greatly limits the uniform oxidation reaction, which not only leads to uneven oxidation, but also leads to unstable perf

Method used

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  • Novel preparation method of oxidized regenerated cellulose product

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] 1). The wood pulp is immersed in a sodium hydroxide solution with a concentration of 200 g / L at a temperature of 40°C to pretreat the cellulose product, and then squeezed and crushed by a press to remove the hemicellulose And the impurities on the surface of the fiber, reaching a cellulose content of 26%, an alkali content of 15%, and a density of 150 kg / m3 in the resulting alkali cellulose product;

[0033] 2) Adding a sodium hydroxide pre-alkalization solution with a concentration of 100 g / L to further expand the cellulose. After adding alkali, the content of methyl cellulose is reduced to 20%. Adding 32% of carbon disulfide by weight of A cellulose into the system for yellowing reaction. The initial temperature of the yellowing reaction is 12°C, the final temperature is 26°C, and the yellowing time is 120 minutes;

[0034] 3) The sodium cellulose sulfonate obtained in the previous step is further dissolved with 100 g / L sodium hydroxide solution, the di...

Example Embodiment

[0041] Example 2

[0042] 1) The cotton pulp is immersed in a sodium hydroxide solution with a concentration of 300 g / L at a temperature of 60°C to pretreat the cellulose product, and then squeezed and crushed by a press to remove the hemicellulose And the impurities on the surface of the fiber, reaching a cellulose content of 32%, an alkali content of 18%, and a density of 200 kg / m3 in the obtained alkali cellulose product;

[0043] 2) Adding a sodium hydroxide pre-alkalizing solution with a concentration of 130 g / L to further expand the cellulose. After adding alkali, the content of methyl cellulose is reduced to 22%. 36% of carbon disulfide of the weight of A cellulose is added into the system for yellowing reaction. The initial temperature of the yellowing reaction is 20°C, the final temperature is 34°C, and the yellowing time is 60 minutes;

[0044] 3). The sodium cellulose sulfonate obtained in the previous step is further dissolved with 130 g / L sodium hydroxide solution, th...

Example Embodiment

[0051] Example 3

[0052] 1). The bamboo pulp is immersed in a sodium hydroxide solution with a concentration of 250 g / L at a temperature of 50°C to pretreat the cellulose product, and then squeezed and crushed by a press to remove the hemicellulose And the impurities on the surface of the fiber, reaching a cellulose content of 29%, an alkali content of 16.5%, and a density of 175 kg / m3 in the obtained alkali cellulose product;

[0053] 2) Adding a sodium hydroxide pre-alkalizing solution with a concentration of 115 g / L to further expand the cellulose. After adding alkali, the content of methyl cellulose is reduced to 21%. Adding 34% carbon disulfide by weight of A cellulose into the system for yellowing reaction. The initial temperature of the yellowing reaction is 16℃, the final temperature is 30℃, and the yellowing time is 90 minutes;

[0054] 3). The sodium cellulose sulfonate obtained in the previous step is further dissolved with 115 g / L sodium hydroxide solution, the dissol...

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Abstract

The invention discloses a novel preparation method of an oxidized regenerated cellulose product, and the method comprises the steps of dipping wood pulp, cotton pulp or bamboo pulp in a sodium hydroxide solution with the concentration of 200-300 g/l at the temperature of 40-60 DEG C for carrying out pretreatment on a cellulose product, squeezing by a presser, crushing, removing impurities on the surfaces of hemicellulose and fiber, and the like, a cellulose solution is first prepared by using wood celluloses, cotton cellulose or bamboo cellulose, so that the crystallization structure of the cellulose is completely destroyed, the surface impurities are removed by reasonably pre-treating the cellulose fiber, the surface of the fiber is activated, the sodium hydroxide solution is adopted as asolvent, carbon disulfide is added for yellowing reaction, the cellulose fiber is rapidly dissolved to obtain a viscous liquid, after the cellulose is fully dissolved into the solution, the compact crystallization structure is fully dissociated, the purity of the obtained cellulose is high by impurity removal, and the product performance is more reliable.

Description

technical field [0001] The invention relates to the field of oxidized cellulose products, in particular to a novel preparation method of oxidized regenerated cellulose products. Background technique [0002] Cellulose is a macromolecular polysaccharide composed of glucose, insoluble in water and general organic solvents, and is the main component of plant cell walls. Cellulose is the most widely distributed and most abundant polysaccharide in nature, accounting for the carbon content of the plant kingdom. More than 50% of cotton, the cellulose content of cotton is close to 100%, which is the purest natural cellulose source. In general wood, cellulose accounts for 40-50%, and there are 10-30% hemicellulose and 20-30% lignin. [0003] Cellulose is the main structural component of plant cell walls, usually combined with hemicellulose, pectin and lignin, and cellulose is composed of D-glucopyranose (anhydroglucose). The molecular structure is as follows: [0004] [0005] ...

Claims

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Application Information

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IPC IPC(8): D01F11/02D01F2/08
CPCD01F2/08D01F11/02
Inventor 张治国索艳格黄伟孙伟庆
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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