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Method for improving dyeing performance of dead cotton

A dyeing performance and modification technology, applied in the field of natural fiber modification, can solve the problems of cell destruction and material shrinkage

Inactive Publication Date: 2012-06-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the freeze-drying process, the solid component is supported by the solid ice on its seat, and when the ice sublimates, pores will be left in the dried remaining material. Therefore, the freeze-dried material is loose and porous, and it is sponge-like. After absorbing water quickly, the original properties are restored almost immediately, that is, the rehydration is good, while the traditional drying method will cause the material to shrink and destroy the cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The first step: hot water swelling treatment

[0017] Use 80°C warm water to carry out hot water swelling treatment on the dead cotton, and the treatment time is 30 minutes;

[0018] Step Two: Filter

[0019] 80-mesh metal screen is used to filter, and the water passing through the screen can be reused;

[0020] Step 3: cryogenic freezing

[0021] Put the dead cotton that has been treated with hot water and contains sufficient moisture in the freezer of an ultra-low temperature refrigerator at a temperature of -80°C until all the dead cotton hardens;

[0022] Step Four: Freeze Drying

[0023] The completely frozen dead cotton is freeze-dried by using a vacuum freeze-drying machine. During the freeze-drying process, the vacuum degree is less than 20 Pa and the temperature is -50°C.

Embodiment 2

[0025] The first step: hot water swelling treatment

[0026] Use 60°C warm water to carry out hot water swelling treatment on the dead cotton, and the treatment time is 60 minutes;

[0027] Step Two: Filter

[0028] Use 40-mesh metal screen to filter, and the water passing through the screen can be reused;

[0029] Step 3: cryogenic freezing

[0030] Put the dead cotton that has been treated with hot water and contains sufficient moisture in the freezer of an ultra-low temperature refrigerator at a temperature of -25 to freeze until all the dead cotton hardens;

[0031] Step Four: Freeze Drying

[0032] The completely frozen dead cotton is freeze-dried by using a vacuum freeze-drying machine. During the freeze-drying process, the vacuum degree is less than 20 Pa and the temperature is -50°C.

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PUM

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Abstract

The invention relates to a method for improving the dyeing performance of dead cotton by adopting a lyophilization method for modification. The method comprises the following main process steps of swelling treatment on the dead cotton with hot water, filtering, freezing at low temperature and lyophilizing. Air gaps are formed inside dead cotton fibers modified with the method disclosed by the invention, so that the adsorption performance of the modified dead cotton to the dye can be improved and further the dyeing performance is improved.

Description

technical field [0001] The invention relates to a method for modifying cotton fibers, in particular to a modification method for improving the dyeing performance of dead cotton. It belongs to the technical field of natural fiber modification. Background technique [0002] Freeze-drying (abbreviated as freeze-drying) is to pre-cool the substance containing a lot of water into a solid, and then make the water vapor directly sublimate from the solid under vacuum conditions, while the substance itself remains in the frozen ice shelf, thereby Make the dry product maintain its original shape. During the freeze-drying process, the solid component is supported by the solid ice on its seat, and when the ice sublimates, pores will be left in the dried remaining material. Therefore, the freeze-dried material is loose and porous, and it is sponge-like. After absorbing water quickly, the original properties are restored almost immediately, that is, the rehydration is good, while the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P5/20D06P3/60
Inventor 侯秀良马丽芸温乐蛟
Owner JIANGNAN UNIV
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