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Method for preparing water-soluble cellulose from waste cotton

A technology of water-soluble cellulose and waste cotton, which is applied in the direction of cellulose pulp post-treatment, fiber raw material treatment, pulp property modification, etc., can solve the problem of low recycling rate of waste cotton, achieve less environmental pollution, and reduce raw material costs , high substitution effect

Inactive Publication Date: 2018-07-27
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low recycling rate of waste cotton, the present invention provides a method for preparing water-soluble cellulose from waste cotton

Method used

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  • Method for preparing water-soluble cellulose from waste cotton
  • Method for preparing water-soluble cellulose from waste cotton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Cut the waste cotton fabric into 5 mm pieces 2 square, wash and tumble dry. Weigh 10 g of sample, add it to a 600 mL beaker, add 1.5% hydrochloric acid solution, and stir at 400 r / min for 30 min at room temperature, so that the reactants are evenly dissolved or dispersed in water. Then, it was loaded into an autoclave and sealed, and the autoclave was filled to 60%. After being kept at the reaction temperature of 150°C for 3 h, the reaction product was naturally cooled to room temperature, and the reaction product was taken out and centrifuged. The separated solid cellulose powder was dried in a drying oven at 60 °C for 4 h, and dried for use.

[0028] (2) The cellulose isolated from waste cotton was converted into CMC in two steps: alkalization and etherification of cellulose. Weigh 5.0 g of cellulose powder, add it into a 500 mL Schott bottle, then add 30 mL of 40% sodium hydroxide solution, and stir at 50 °C for 20 min to obtain alkali cellulose. Weigh 1.5 g ...

Embodiment 2

[0030] (1) Cut the waste cotton fabric into 5 mm pieces 2 square, wash and tumble dry. Weigh 10 g sample, add it into a 600 mL beaker, add 1.5% hydrochloric acid solution, and stir at 400 r / min for 30 min at room temperature, so that the reactants are evenly dissolved or dispersed in water. Then, it was loaded into an autoclave and sealed, and the autoclave was filled to 60%. After being kept at the reaction temperature of 150°C for 3 h, the reaction product was naturally cooled to room temperature, and the reaction product was taken out and centrifuged. The separated solid cellulose powder was dried in a drying oven at 60 °C for 4 h, and dried for use.

[0031] (2) The cellulose isolated from waste cotton was converted into CMC in two steps: alkalization and etherification of cellulose. Weigh 5.0 g of cellulose powder, add it into a 500 mL Schott bottle, then add 30 mL of 40% sodium hydroxide solution, and stir at 50 °C for 20 min to obtain alkali cellulose. Weigh 1.5g of...

Embodiment 3

[0033] (1) Cut the waste cotton fabric into 5 mm pieces 2 square, wash and tumble dry. Weigh 10 g sample, add it into a 600 mL beaker, add 1.5% hydrochloric acid solution, and stir at 400 r / min for 30 min at room temperature, so that the reactants are evenly dissolved or dispersed in water. Then, it was loaded into an autoclave and sealed, and the autoclave was filled to 60%. After being kept at the reaction temperature of 150°C for 3 h, the reaction product was naturally cooled to room temperature, and the reaction product was taken out and centrifuged. The separated solid cellulose powder was dried in a drying oven at 60 °C for 4 h, and dried for use.

[0034] (2) The cellulose isolated from waste cotton was converted into CMC in two steps: alkalization and etherification of cellulose. Weigh 5.0 g of cellulose powder, add it into a 500 mL Schott bottle, then add 30 mL of 40% sodium hydroxide solution, and stir at 50 °C for 20 min to obtain alkali cellulose. Weigh 1.5g of...

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Abstract

The invention relates to a method for preparing water-soluble cellulose from waste cotton, belongs to the technical field of recycling of waste textiles and can solve the problem of low recycling rateof waste cotton. Cotton cellulose is prepared from a waste fabric with the highest cellulose content in nature as a raw material after hydrothermal extraction. Chloroacetic acid and isopropanol are taken as complex etherifying agents, cellulose is subjected to methylation modification, and finally, water-soluble sodium CMC (carboxymethyl cellulose) with high degree of substitution is obtained. The method has the advantages that waste cotton fiber is effectively recycled, and sodium CMC with excellent performance is prepared. The process flow is short, and a high value-added utilization way for the waste cotton fiber is found.

Description

technical field [0001] The invention belongs to the technical field of recycling waste textiles, and in particular relates to a method for preparing water-soluble cellulose from waste cotton. Background technique [0002] People's living and consumption levels are constantly improving, the service life of textiles is shortening sharply, and waste textiles are increasing year by year. However, the recycling efficiency of waste textiles is extremely low, resulting in a great waste of resources. Among them, polyester-cotton fabrics account for more than 80% of textiles, but their recycling rate is less than 10%. Cotton fiber is the most widely used natural fiber, and its cellulose content is as high as 94%. However, cellulose is insoluble in water and general organic solvents, which greatly limits the application of cellulose. In order to improve the applicability of cellulose, the cellulose was prepared into water-soluble sodium carboxymethyl cellulose (CMC) by carboxymethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/00C08B1/08
CPCC08B1/08D21C5/00D21C9/004D21C9/005
Inventor 郜丽霞张美玲张素英凌晨侯文生史晟张博楠
Owner TAIYUAN UNIV OF TECH
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