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Anhydrous Dyeing Method for Dyeing and Fixing Cotton Fabrics Step by Step

A technology for anhydrous dyeing, cotton fabrics, applied in the field of printing and dyeing, can solve problems such as emissions

Active Publication Date: 2019-09-10
绍兴百丽恒印染有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Further, the purpose of the present invention is to simultaneously solve the problems of wastewater discharge caused by water-bath dyeing, dyeing dark tones, and improving the blackness of black cotton fabrics, etc.
[0009] Furthermore, the purpose of the present invention is to simultaneously solve the problems of wastewater discharge caused by water-bath dyeing, dyeing dark shades, improving the blackness of black cotton fabrics and providing a color fixation rate comparable to that of the prior art.

Method used

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  • Anhydrous Dyeing Method for Dyeing and Fixing Cotton Fabrics Step by Step
  • Anhydrous Dyeing Method for Dyeing and Fixing Cotton Fabrics Step by Step
  • Anhydrous Dyeing Method for Dyeing and Fixing Cotton Fabrics Step by Step

Examples

Experimental program
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Effect test

Embodiment 1

[0186] Reactive black dye composition is formed by mixing 65% of the dye compound represented by the formula (I-1), 25% of the dye compound represented by the formula (II-1), and 10% of the dye compound represented by the formula (III-1) . The reactive black dye composition was dissolved in an anhydrous solvent of ethylene glycol monomethyl ether acetate and dimethyl sulfoxide at a volume ratio of 70:30 to obtain a dyeing bath. Then add the mixture of triethylenediamine and tetramethylguanidine to the anhydrous dye bath, the weight ratio of the two is 1.6:1; the amount of organic base added is 6g / L. Sonication yields a homogeneous anhydrous dye bath. A cotton fabric previously swollen with dimethyl sulfoxide with a swelling degree of 22% was placed in an anhydrous dyeing bath. The bath ratio of cotton fabric to anhydrous dyeing bath is 1:16g / mL. The dye dosage is 4o.w.f%. Heat up at a rate of 3°C / min, keep warm after reaching the target temperature of 85°C, and dye for 5 h...

Embodiment 2

[0188] Reactive black dye composition is formed by mixing the dye compound shown in 70% formula (I-1), 22% dye compound shown in formula (II-1), and 8% dye compound shown in formula (III-1) . The reactive black dye composition was dissolved in an anhydrous solvent of ethylene glycol monomethyl ether acetate and dimethyl sulfoxide at a volume ratio of 65:35 to obtain a dyeing bath. Then add the mixture of triethylenediamine and tetramethylguanidine to the anhydrous dye bath, the weight ratio of the two is 1.8:1; the amount of organic base added is 8g / L. Sonication yields a homogeneous anhydrous dye bath. A cotton fabric previously swollen with dimethyl sulfoxide with a swelling degree of 22% was placed in an anhydrous dyeing bath. The bath ratio of cotton fabric to anhydrous dyeing bath is 1:18g / mL. The dye dosage is 4o.w.f%. Heat up at a rate of 3°C / min, keep warm after reaching the target temperature of 90°C, and dye for 4 hours; cool to room temperature after dyeing, use...

Embodiment 3

[0190] Reactive black dye composition is formed by mixing the dye compound shown in 60% formula (I-1), 28% dye compound shown in formula (II-1), and 12% dye compound shown in formula (III-1) . The reactive black dye composition was dissolved in an anhydrous solvent of ethylene glycol monomethyl ether acetate and dimethyl sulfoxide at a volume ratio of 75:25 to obtain a dyeing bath. Then add the mixture of triethylenediamine and tetramethylguanidine to the anhydrous dye bath, the weight ratio of the two is 1.5:1; the amount of organic base added is 5g / L. Sonication yields a homogeneous anhydrous dye bath. A cotton fabric previously swollen with dimethyl sulfoxide with a swelling degree of 22% was placed in an anhydrous dyeing bath. The bath ratio of cotton fabric to anhydrous dyeing bath is 1:14g / mL. The dye dosage is 4o.w.f%. Heat up at a rate of 3°C / min, keep warm after reaching the target temperature of 80°C, and dye for 6 hours; cool to room temperature after dyeing, us...

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Abstract

The invention discloses a waterless dyeing method of performing dyeing and color fixing on cotton fabric step by step. The waterless dyeing method of performing dyeing and color fixing on the cotton fabric step by step comprises the steps of placing the cotton fabric in a waterless dye bath to be dyed; and further adding fixation alkali mainly containing organic alkali to the waterless dye bath after reaching a target temperature. The waterless dyeing method of performing dyeing and color fixing on the cotton fabric step by step, disclosed by the invention, has the advantages that a waste water discharge problem caused by water bath dyeing can be solved, deep shades are dyed, the blackness degree of the black cotton fabric is enhanced, the fixation rate of an active dye composition is coordinated, the colour fastness of waterless dyeing is improved and so on.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing, and relates to an anhydrous dyeing method for dyeing and fixing cotton fabrics step by step. Background technique [0002] At present, the dyeing of cotton fabrics is mainly through nucleophilic substitution or addition reaction between reactive groups of reactive dyes and hydroxyl groups on fabric fibers to form chemical bonds. This is usually done in a water bath. Since water molecules are also excellent nucleophiles, there are competing reactions of dye hydrolysis or chemical bond breaking in the solution. In addition, color fixing is usually required after dyeing, and common color fixing agents such as sodium carbonate and sodium phosphate are alkaline substances. This will further aggravate the degree of dye hydrolysis, resulting in low dye fixation rate, and a large amount of unfixed dye remains in the water bath. When cotton fabrics are dyed in dark shades, especially black,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/38D06P3/66D06P5/06D06P5/10
Inventor 夏忠
Owner 绍兴百丽恒印染有限公司
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