Method for preparing water absorbent fiber

A technology of water-absorbing fiber and cellulase, which is applied in the post-treatment modification of cellulose pulp, etc., can solve the problems of limiting the water-absorbing performance of cellulose-based water-absorbing materials, and achieve the effects of simple operation, high water-absorbing capacity and improving water-absorbing performance.

Inactive Publication Date: 2015-12-23
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cellulose is a degradable polymer compound, and cellulose contains hydrophilic groups such as hydroxyl and carboxyl groups. It is chemically modified by means of crosslinking and grafting to introduce more hydrophilic groups to Improve its water absorption performance. Due to the pore structure characteristics of cellulose, it is easy to close the pore structure in the process of crosslinking and graft copolymerization, thereby limiting the water absorption performance of cellulose-based water-absorbing materials.

Method used

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  • Method for preparing water absorbent fiber
  • Method for preparing water absorbent fiber
  • Method for preparing water absorbent fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing water-absorbent fibers, comprising the steps of:

[0022] 1) Measure four parts of poplar bleached chemical thermomechanical pulp with a mass concentration of 3% to adjust the pH to 5.5, stir at a rotating speed of 500rpm, one part does not add cellulase, and the remaining three parts add cellulase to make the fiber The mass fractions of cellulase were 0.02%, 0.04% and 0.5%, respectively, and treated in a water bath at 50° C. for 1 hour to obtain cellulase pretreated slurry;

[0023] 2) Mix methyl vinyl ether / maleic anhydride copolymer and polyethylene glycol 3350 with water to obtain solution 1, mix solution 1 with cellulase pretreatment slurry, stir for 1 hour, and dry at 65°C Until its quality no longer changes; place (i.e. solidify) at a temperature of 130°C for 6.5 minutes to obtain water-absorbing fibers, the cellulase pretreatment slurry, methyl vinyl ether / maleic anhydride copolymer, polyethylene glycol The mass ratio of alcohol 3350 is 1...

Embodiment 2

[0029] A method for preparing water-absorbent fibers, comprising the steps of:

[0030] 1) Take four parts of maple high-yield pulp with a mass concentration of 1% to adjust the pH to 6.5, stir at a speed of 300 rpm, add cellulase to one part, and add cellulase to the remaining three parts to make the cellulase The mass fractions are 0.02%, 0.04% and 0.5%, respectively, and are incubated in a water bath at 45°C for 0.5h to obtain a cellulase pretreated slurry;

[0031] 2) Mix methyl vinyl ether / maleic anhydride copolymer and polyethylene glycol 1450 with water to obtain solution 1, mix solution 1 with cellulase pretreatment slurry, stir for 0.5h, and set the temperature at 50°C Dry until its quality does not change; place (i.e. solidify) at a temperature of 140°C for 2 minutes to obtain water-absorbing fibers, the cellulase pretreatment slurry, methyl vinyl ether / maleic anhydride copolymer, polyethylene glycol The mass ratio of alcohol 1450 is 1:0.5:0.12.

[0032] The water-...

Embodiment 3

[0037] A method for preparing water-absorbent fibers, comprising the steps of:

[0038] 1) Take four parts of poplar bleached kraft pulp with a mass concentration of 5% to adjust the pH to 5, stir at a rotating speed of 800rpm, one part does not add cellulase, and the remaining three parts add cellulase to make the cellulase The mass fractions are 0.02%, 0.04% and 0.5%, respectively, and are incubated in a water bath at 45°C for 3 hours to obtain a cellulase pretreated slurry;

[0039] 2) Mix methyl vinyl ether / maleic anhydride copolymer and polyethylene glycol 3350 with water to obtain solution 1, mix solution 1 with cellulase pretreatment slurry, stir for 1.5h, and set the temperature at 70°C Dry until its quality does not change; place (i.e. solidify) at a temperature of 120°C for 15 minutes to obtain water-absorbing fibers, the cellulase pretreatment pulp, methyl vinyl ether / maleic anhydride copolymer, polyethylene glycol The mass ratio of alcohol 3350 is 1:2:0.3.

[004...

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Abstract

The invention discloses a method for preparing a water absorbent fiber. The method comprises the following steps: 1) adjusting the pH value of a fiber slurry to 5-6.5, adding cellulase under stirring, and insulating in a water bath to obtain a cellulase pretreated slurry; 2) adding water to a methyl vinyl ether / maleic anhydride copolymer and polyethylene glycol, mixing well to obtain a solution 1, mixing the solution 1 with the cellulase pretreated slurry, stirring, and drying at 50-70 DEG C; placing in 120-140 DEG C to obtain the water absorbent fiber. The method of the invention can generate more pore structure in the cellulose fiber, provide more space and combination points for cross-linking and grafting copolymerization, abs greatly improve the water absorption performance of the water absorbent fiber. The method has simple operation, and the obtained water absorbent fiber has high water absorbent capability.

Description

technical field [0001] The invention belongs to the field of polymer materials and pulping and papermaking, and in particular relates to a preparation method of water-absorbing fibers. Background technique [0002] Superabsorbent resins (SAPs) are the most widely used superabsorbent materials, which can absorb thousands of times their own weight in water. Because of its good water absorption and water retention, it is widely used in disposable sanitary products. However, superabsorbent resins are mainly derived from acrylamide (Am), acrylic acid (AA) monomers and crosslinking agents, most of which are petroleum-based non-renewable resources, which are not biodegradable and will cause environmental pollution. Based on the protection of the environment and the sustainable development of resources, cellulose products have become a research hotspot, and researchers have begun to prepare cellulose-based superabsorbent materials to partially replace the most used superabsorbent r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/20
Inventor 刘洪斌陈翠郭虎祥
Owner TIANJIN UNIV OF SCI & TECH
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