Technology for dyeing ramie fiber with overcritical carbon dioxide method

A ramie fiber, carbon dioxide technology, applied in the direction of dyeing, textile and papermaking, can solve the problems of high temperature and high pressure, and achieve the effects of low dyeing pressure, uniform dyeing and low comprehensive cost

Inactive Publication Date: 2006-09-13
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since supercritical fluid dyeing was first proposed in 1991, domestic and foreign supercritical carbon dioxide dyeing is limited to chemical fibers. There are still relatively few reports on supercritical dyeing of natural fibers, especially ramie fibers, and the temperature is high and the pressure is high.

Method used

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  • Technology for dyeing ramie fiber with overcritical carbon dioxide method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Swelling treatment: ramie fibers are treated with 15% sodium hydroxide solution to eliminate polarity and partial hydrogen bonds, reducing the crystallinity of fibers. At room temperature, treat for 150 minutes.

[0023] Modification treatment: ramie fibers are treated with benzoyl chloride to introduce hydrophobic benzoyl groups. At room temperature, treat for 30 minutes.

[0024] Disperse dyes (the amount of dyestuff is 5.0% of the weight of the fiber) are charged into the autoclave, and then the ramie fibers are fixed in the autoclave. Turn on the refrigeration compressor to let the liquid carbon dioxide flow out from the steel cylinder and enter the autoclave through the high-pressure pump. Pressurize to 3-4MPa, raise the temperature to 90°C, pressurize again to the predetermined pressure of 15MPa, start stirring, and dye for 120 minutes.

[0025] After the dyeing time is up, carbon dioxide is discharged, and when the pressure is reduced to normal pressure, the d...

Embodiment 2

[0027] Swelling treatment: 20% of the ramie fiber is treated with sodium hydroxide solution to eliminate polarity and partial hydrogen bonds, reducing the crystallinity of the fiber. At room temperature, treat for 90 minutes.

[0028] Modification treatment: ramie fibers are treated with benzoyl chloride to introduce hydrophobic benzoyl groups. At room temperature, process for 20 minutes.

[0029] The disperse dye (the amount of the dyestuff is 3.0% of the weight of the fiber) is loaded into the autoclave, and then the ramie fiber is fixed in the autoclave. Turn on the refrigeration compressor to let the liquid carbon dioxide flow out from the steel cylinder and enter the autoclave through the high-pressure pump. Pressurize to 3-4MPa, heat up to 110°C, pressurize again to the predetermined pressure of 18MPa, start stirring, and dye for 150 minutes.

[0030] After the dyeing time is up, carbon dioxide is discharged, and when the pressure is reduced to normal pressure, the dy...

Embodiment 3

[0032] Swelling treatment: 25% of the ramie fiber is treated with sodium hydroxide solution to eliminate polarity and partial hydrogen bonds, reducing the crystallinity of the fiber. At room temperature, treat for 60 minutes.

[0033] Modification treatment: ramie fibers are treated with benzoyl chloride to introduce hydrophobic benzoyl groups. Incubate for 10 minutes at room temperature.

[0034] Disperse dyes (the amount of dyestuff is 2.5% of the weight of the fiber) are packed into an autoclave, and then the ramie fibers are fixed in the still. Turn on the refrigeration compressor to let the liquid carbon dioxide flow out from the steel cylinder and enter the autoclave through the high-pressure pump. Pressurize to 3-4MPa, raise the temperature to 130°C, pressurize again to the predetermined pressure of 20MPa, start stirring, and dye for 90 minutes.

[0035] After the dyeing time is up, carbon dioxide is discharged, and when the pressure is reduced to normal pressure, th...

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Abstract

The invention relates to a new process of supercritical CO2 dyeing of ramie fiber, using ramie fiber as raw material, swelling by NaOH solution and modifying by benzoyl chloride, and dyeing with dispersive dye in supercritical CO2 medium by supercritical fluid technique. And its advantages: it is a clean producing process; the dyed ramie fiber has characters of bright color, short dyeing flow, dyeing uniformity, good color intensity, low synthetic cost, and remarkable economic and environmental protection benefits. And it also reveals a process device implementing the dyeing method, suitable to spread and apply in spinning and weaving, and printing and dyeing enterprises.

Description

1. Technical field [0001] The invention relates to a method for dyeing ramie fibers, which is especially suitable for the supercritical carbon dioxide dyeing process of ramie fibers. The method provided by the invention can avoid the treatment of a large amount of sewage in the traditional dyeing method, save energy, and obtain dyeing performance comparable to the traditional dyeing. 2. Technical Background [0002] Ramie is an ancient crop, and its main producing areas are now my country and some other Asian countries. Ramie products are excellent textile raw materials, which have the advantages of coolness, breathability and crispness. However, due to its high degree of crystallinity and orientation, it leads to poor extensibility and elasticity, and the dyeing effect is not good enough. On the other hand, my country is a big textile country. Traditional dyeing and finishing consumes a lot of water, causes serious environmental pollution and high overall costs. With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/94D06P3/60
Inventor 刘昭铁张利利
Owner SHAANXI NORMAL UNIV
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