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Processing method for removing hydrolyzed reactive dyes on cotton knitted fabric by using solvent water system

A technology of hydrolysis activity and processing method, applied in the direction of dyeing method, textile and paper making, dry cleaning fiber products, etc. Effect

Inactive Publication Date: 2013-01-23
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some studies have used three high-temperature water washes instead of five standard washes after dyeing, the effect on COD and BOD 5 Reduction helps somewhat, but increasing energy use while reducing water use does not significantly reduce overall costs

Method used

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  • Processing method for removing hydrolyzed reactive dyes on cotton knitted fabric by using solvent water system
  • Processing method for removing hydrolyzed reactive dyes on cotton knitted fabric by using solvent water system

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1. Pretreatment of dyed fabric: After dyeing the cotton fabric, drain the dyeing residue, wash it twice with water at room temperature (water-to-bath ratio 1:10, time 10 minutes), and soap it once (the amount of Shanghai Jiahe soaping agent AST is 1g / l, temperature 95°C, time 20min, bath ratio 1:10); 2. Preparation of acetone water system: under normal temperature conditions, add acetone and water in a volume ratio of 1:1 into the sealing treatment equipment equipped with fabrics , the bath ratio is controlled at 1:10, and the pH is adjusted to 8±0.1 with soda ash; 3. The acetone water system is used to treat the cotton fabric: the acetone water system is heated to 40°C, and after the cotton fabric is treated for 20 minutes, the residual liquid is discharged into the solvent In the recovery equipment, then add the acetone water system in the same way, treat at 40°C for 20 minutes, and discharge the residual liquid into the recovery equipment; 4. Acetone recovery.

[002...

Embodiment 2

[0027] 1. Soaping of dyed fabrics: Drain the dyed fabrics, drain the dyeing residue, wash them twice at room temperature (water bath ratio 1:15, time 10min), soaping (Shanghai Jiahe AST soaping agent dosage is 2g / l, temperature 95°C, time 20 minutes, bath ratio 1:15); 2. Preparation of solvent water system: under normal temperature conditions, add the sealing treatment equipment equipped with fabric according to the ratio of absolute ethanol to water 1:1.5 In the process, the bath ratio is controlled at 1:15, and the pH is adjusted to 6±0.1 with glacial acetic acid; 3. Treatment of cotton fabrics in the absolute ethanol water system: raise the temperature of the absolute ethanol water system to 50°C, and treat the cotton fabrics for 30 minutes , the residual liquid is discharged into the solvent recovery equipment, and then added to the absolute ethanol water system according to the same method, treated at 50°C for 30 minutes, and the residual liquid is discharged into the rec...

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Abstract

The invention relates to a processing method for removing hydrolyzed reactive dyes on a cotton knitted fabric by using a solvent water system. The processing method comprises the steps that: (1) residual dye liquid is removed after the cotton knitted fabric is dyed, then washing and soaping are carried out; (2) a solvent and water are mixed according to the volume ratio of 1:1-1:3 under the condition of room temperature, and the pH value of the mixture is adjusted to form a solvent water system; and (3) the pretreated dyed cotton knitted fabric is processed for two times by using the solvent water system. According to the method, the dyed cotton knitted fabric is processed by the low-temperature solvent water system for two times rather than one-time high-temperature washing and two-time room-temperature washing in the conventional washing process, the after treatment time is shortened, the production efficiency is improved, and the production cost is reduced; the recovery and recycling of sources is achieved through a solvent recovery system, the production cost is saved, and the environment pollution is reduced; and the after treatment water consumption is greatly saved due to the recovery and repeated use of the solvent, the waste water discharge is reduced, the energy consumption is reduced, and remarkable economic benefit and social benefit are achieved.

Description

technical field [0001] The invention belongs to the field of methods for removing hydrolyzed dyes on cotton fabrics, in particular to a processing method for removing hydrolyzed reactive dyes on cotton fabrics with a solvent water system. Background technique [0002] Reactive dyes have become the preferred dyes for printing and dyeing cellulose textiles due to their bright color, complete color spectrum, mature dyeing process, high color fastness, and high cost performance. However, during the dyeing process, as much as 20-40% of the reactive dyes will be hydrolyzed during dyeing and fixation, and cannot react with cellulose to form covalent bonds. Hydrolyzed dyes, only the unstable atoms or groups in the original reactive dyes are replaced by hydroxyl groups, its diffusion and adsorption properties are very similar to the original reactive dyes, so it is easy to diffuse into the fiber and adsorb on its surface to form "floating color"; In addition, when dyeing dark colors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P5/04D06P3/66D06L1/08D06L1/16
Inventor 何瑾馨杭彩云刘保江
Owner DONGHUA UNIV
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