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Method for steam explosion-sodium chlorite-alkali treatment combined preparation of cotton bast fibers

A technology of sodium chlorite and cotton stalk bark, which is applied in the chemical post-treatment of fibers, fiber treatment, textiles and papermaking, etc., and can solve problems such as fiber damage, large amount of alkali used in chemical methods, and thick fibers

Inactive Publication Date: 2015-07-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they have taken a step forward in the field of extracting cotton stalk fiber, the fiber produced by the biological enzyme method is relatively thick, and the chemical method uses a large amount of alkali, which will damage the fiber, and the degumming waste liquid will cause serious environmental pollution.

Method used

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  • Method for steam explosion-sodium chlorite-alkali treatment combined preparation of cotton bast fibers
  • Method for steam explosion-sodium chlorite-alkali treatment combined preparation of cotton bast fibers
  • Method for steam explosion-sodium chlorite-alkali treatment combined preparation of cotton bast fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) cutting: the cotton stalk bark is cut into 8cm long fragments;

[0029] (2) Soaking: place the cut cotton stalk skin in clear water with a solid-to-liquid ratio of 1:20, and soak for 12 hours;

[0030] (3) Steam flash explosion: put the soaked cotton stalks into the flash explosion tank, inject saturated water vapor, make the saturated water vapor pressure reach 2.0MPa, maintain the saturated water vapor pressure for 120s, and then flash instantly within 0.0875s ;

[0031] (4) Washing with hot water: wash the cotton stalk fiber after flash explosion in hot water at 90° C. for 1 hour, with a solid-to-liquid ratio of 1:40, filter through a sieve with an aperture of 20 mesh, and collect the cotton stalk fiber;

[0032] (5) Sodium chlorite treatment: use sodium chlorite solution to process the cotton stalk fiber obtained in step (4), the solid-to-liquid ratio is 1:30, the temperature is 70°C, the pH value is 3.5, and the sodium chlorite solution The mass percentage co...

Embodiment 2

[0036] (1) cutting: the cotton stalk bark is cut into 9cm long fragments;

[0037] (2) Soaking: put the cut cotton stalk skin in clear water with a liquor ratio of 1:15, and soak for 18 hours;

[0038] (3) Steam flash explosion: put the soaked cotton stalks into the flash explosion tank, feed saturated water vapor to make the saturated water vapor pressure reach 1.7MPa, maintain the saturated water vapor pressure for 180s, and then flash instantly within 0.0875s ;

[0039] (4) Washing with hot water: wash the cotton stalk fiber after flash explosion in hot water at 85° C. for 1.5 h, with a solid-to-liquid ratio of 1:30, filter through a 20-mesh sieve, and collect the cotton stalk fiber;

[0040] (5) Sodium chlorite treatment: use sodium chlorite solution to process the cotton stalk fiber obtained in step (4), the solid-to-liquid ratio is 1:20, the temperature is 60°C, the pH value is 4, and the sodium chlorite solution The mass percentage concentration is 0.4%, and the cotto...

Embodiment 3

[0044] (1) cutting: the cotton stalk bark is cut into 10cm long fragments;

[0045] (2) Soaking: put the cut cotton stalk skin in clear water with a liquor ratio of 1:10, and soak for 24 hours;

[0046](3) Steam flash explosion: put the soaked cotton stalks into the flash explosion tank, feed saturated water vapor to make the saturated water vapor pressure reach 1.5MPa, maintain the saturated water vapor pressure for 180s, and then flash instantly within 0.0875s ;

[0047] (4) Washing with hot water: wash the cotton stalk fiber after flash explosion in hot water at 80° C. for 2 hours, with a solid-to-liquid ratio of 1:20, filter through a sieve with an aperture of 20 mesh, and collect the cotton stalk fiber;

[0048] (5) Sodium chlorite treatment: process the cotton stalk fiber obtained in step (4) with sodium chlorite solution, the solid-to-liquid ratio is 1:25, the temperature is 80°C, and the pH value is 4.5, which is sodium chlorite The mass percent concentration of the ...

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Abstract

The invention relates to a method for steam explosion-sodium chlorite-alkali treatment combined preparation of cotton bast fibers. The method comprises cotton bast cutting, immersion, steam explosion, hot water cleaning, sodium chlorite treatment, alkali treatment, water washing, air drying and carding. The method concretely comprises pretreating cotton bast by a steam explosion method so that impurities such as hemicellulose and pectin are partially degraded, treating the fibers subjected to steam explosion by a sodium chlorite solution, carrying out oxidative degradation on lignin, and carrying out treatment by potassium hydroxide and sodium sulfide to remove residual impurities so that good-separation degree low-colloid content cotton bast cellulose fibers for weaving are prepared. Compared with the traditional soda boiling preparation method of cotton bast fibers, the method utilizes steam explosion pretreatment to separate cotton bast and has very short shooting time (of 0.0875s) on a steam explosion technical bedstand and a large action force to fibers at the moment of explosion. The method reduces an alkali use amount and reduces environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing cotton stalk skin fibers by combining steam flash explosion-sodium chlorite-alkali treatment, which belongs to the field of textile fiber preparation. Background technique [0002] my country is a big cotton-producing country with abundant cotton stalk resources. Cotton stalk is a renewable resource, and its cellulose content is about 40%. Extracting cotton stalk fiber suitable for textile and composite materials from cotton stalk will help to increase the value of cotton crops. As an agricultural by-product, most of the cotton stalks are used as fuel and burned or stacked and rotted in the field, and a small part is used for pulp and paper making, feed or feed raw materials, fertilizer making and returning to the field, processing sacks and ropes, etc. , low utilization rate, resulting in a great waste of biological resources. [0003] At present, the patents for preparing cotton stalk husk fibers main...

Claims

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Application Information

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IPC IPC(8): D01C1/00
CPCD01C1/00
Inventor 侯秀良张莉董震
Owner JIANGNAN UNIV
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