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Method for preparing super absorbent fiber by modification of polyvinyl alcohol fiber

A technology of polyvinyl alcohol fiber and superabsorbent fiber, applied in the direction of fiber type, fiber treatment, fiber chemical characteristics, etc., to achieve the effect of less initial capital investment, simple production equipment, and less equipment investment

Inactive Publication Date: 2009-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinyl alcohol superabsorbent fibers have not yet been seen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Water-soluble polyvinyl alcohol fiber (water melting temperature 80 DEG C), solvent: butyl acetate, the concentration by weight of butyl acetate of maleic anhydride is 8%. The reaction temperature was 80°C and the time was 3 hours.

[0027] Methanol solution of sodium hydroxide, alkaline treatment. The weight percent concentration of sodium hydroxide in the methanol solution is 0.5%, and the treatment time is 50 minutes.

[0028] After that, it was washed with methanol and dried at 80°C to obtain polyvinyl alcohol type superabsorbent fibers.

[0029] The deionized water absorption rate of the fiber is 220 times, and the absorption rate of normal saline is 45 times.

Embodiment 2

[0031] Water-soluble polyvinyl alcohol fiber (water-soluble temperature is room temperature, solvent: dioxane, the concentration by weight of the dioxane of maleic anhydride is 20%. Reaction temperature 60 ℃, time 2 hours.

[0032] Potassium hydroxide in ethanol, alkalized. The weight percent concentration of sodium hydroxide in the ethanol solution is 1%, and the treatment time is 30 minutes.

[0033] Afterwards, it was washed with ethanol and dried at a temperature of 90° C. to obtain polyvinyl alcohol type superabsorbent fibers.

[0034] The deionized water absorption rate of the fiber is 350 times, and the absorption rate of normal saline is 54 times.

Embodiment 3

[0036] Water-soluble polyvinyl alcohol fiber (water melting temperature is 70° C.), solvent: butyl acetate, and the concentration by weight of butyl acetate of maleic anhydride is 5%. The reaction temperature was 90°C and the time was 5 hours.

[0037] Ethanol solution of sodium hydroxide, alkaline treatment. The weight percent concentration of sodium hydroxide in the methanol solution is 5%, and the treatment time is 2 minutes.

[0038] After that, it was washed with ethanol and dried at a temperature of 70° C. to obtain polyvinyl alcohol type superabsorbent fibers.

[0039] The deionized water absorption rate of the fiber is 160 times, and the absorption rate of normal saline is 35 times.

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PUM

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Abstract

The invention relates to a method for producing super water-absorbing fiber by modifying polyvinyl alcohol fiber, which includes the following steps: the water-soluble polyvinyl alcohol fiber is esterified in an organic solvent by the maleic anhydride; wherein, the weight percent concentration of the maleic anhydride in the organic solvent is 5-25%, the esterification time is 1-5 hours and the temperature is 50-90 DEG C, then alkali treatment is carried out to the fiber, the fiber that is treated in the alkali solution is washed in the methanol or ethanol, and the final drying process is carried out at the temperature of lower than 80 DEG C. The super water-absorbing fiber can absorb a large amount of water but does not dissolve in the water, is hard to absorb the moisture or agglomerate in the air and is easy to store like the polyvinyl alcohol fiber made of fiber-spinning process; the fiber provided by the invention can absorb deionized water, the weight of which is higher than the self-weight of the fiber by more than 150 times.

Description

technical field [0001] The invention belongs to the field of preparation of polyvinyl alcohol fiber modification, in particular to a method for preparing superabsorbent fiber by modification of polyvinyl alcohol fiber. Background technique [0002] Superabsorbent fiber is a special functional fiber developed after superabsorbent resin. This kind of fiber can absorb 30-50 times of normal saline or more than 150 times of deionized water of its own weight like superabsorbent resin. This moisture can be kept inside the fiber and cannot be squeezed out. Superabsorbent fiber not only has the water absorption and water retention functions of superabsorbent resin, but also has a small diameter of fiber, usually about 30μ, and has a large surface area, so the water absorption speed is faster than resin; the fiber has a large aspect ratio, it It can be entangled with other fibers and is not easy to scatter; super absorbent fibers are easy to use and can be blended with other fibers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/203D06M11/38D01F11/06D01F6/14D06M101/24
Inventor 靳向煜章倩吴海波王富军殷保璞章悦庭李国星钟磊
Owner DONGHUA UNIV
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