A novel preparation method of oxidized regenerated cellulose product

A technology of regenerated cellulose and type A cellulose, which is applied in chemical post-treatment of cellulose/protein rayon, rayon made of viscose, etc. Uncontrollable degree of oxidation, uneven degree of oxidation and other problems, to achieve the effect of fast solidification, stable fineness, and reliable product performance

Active Publication Date: 2021-03-05
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 performance of the final product and degradation performance of the product. Unable to stabilize control
Moreover, the fineness of cellulose fibers is often uncontrollable, and the performance of the product is not good.

Method used

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  • A novel preparation method of oxidized regenerated cellulose product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Pretreat the cellulose product by immersing the wood pulp in a sodium hydroxide solution with a concentration of 200 g / L at a temperature of 40°C, and then press and crush it with a press to remove hemicellulose and the impurities on the surface of the fiber, reaching a cellulose content of 26% in the resulting alkali cellulose product, an alkali content of 15%, and a density of 150 kilograms per cubic meter;

[0033] 2), adding a concentration of 100 grams per liter of sodium hydroxide pre-alkaline solution to further expand the cellulose. After adding alkali, the content of cellulose A was reduced to 20%. Add 32% carbon disulfide of the weight of the first cellulose into the system to carry out 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 was further dissolved with 100 g / L sodium hydroxide ...

Embodiment 2

[0042] 1) Pretreat the cellulose product by immersing the cotton pulp in a sodium hydroxide solution with a concentration of 300 g / L at a temperature of 60°C, and then press and pulverize it with a press to remove hemicellulose and impurities on the surface of the fiber, reaching a 32% cellulose content in the resulting alkali cellulose product, 18% alkali content, and a density of 200 kilograms per cubic meter;

[0043] 2), adding a concentration of 130 grams per liter of sodium hydroxide pre-alkaline solution to further expand the cellulose. After adding alkali, the content of cellulose A decreased to 22%. Add 36% carbon disulfide of the weight of the first cellulose into the system to carry out 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 was further dissolved with 130 g / L of sodium hydroxide solut...

Embodiment 3

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

[0053] 2), adding a concentration of 115 grams per liter of sodium hydroxide pre-alkalinization solution to further expand the cellulose. After adding alkali, the content of cellulose A decreased to 21%. Add 34% carbon disulfide of the weight of the first cellulose into the system to carry out yellowing reaction. The initial temperature of the yellowing reaction is 16°C, the final temperature is 30°C, and the yellowing time is 90 minutes;

[0054] 3), the sodium cellulose sulfonate obtained in the previous step was further dissolved with a 115 g / L sodium hydroxide solutio...

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Abstract

The invention discloses a novel preparation method of oxidized regenerated cellulose products, which comprises soaking wood pulp, cotton pulp or bamboo pulp in hydrogen with a concentration of 200-300 g / liter at a temperature of 40-60°C. The cellulose product is pretreated in sodium oxide solution, and then squeezed and crushed by a press to remove impurities on the surface of hemicellulose and fiber. The present invention uses wood cellulose, cotton cellulose or bamboo cellulose to prepare first Cellulose solution, thus completely destroying the crystalline structure of cellulose, through reasonable pretreatment of cellulose fiber, remove surface impurities, activate fiber surface activity, then use sodium hydroxide solution as solvent, add carbon disulfide for yellowing reaction, promote The rapid dissolution of cellulose fibers produces viscous liquid. After the cellulose is fully dissolved into a solution, its dense crystal structure is fully dissociated, and by removing impurities, the obtained cellulose has high purity and more reliable product performance.

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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Patent Type & Authority Patents(China)
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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