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Dyeing method of cotton product reduced dye with low bath ratio

A technology for cotton products and low liquor ratio, which is applied to the dyeing of cotton products with low liquor ratio vat dyes and cotton fibers with low liquor ratio vat dyes. It can solve problems such as poor color fastness, achieve small color difference, reduce emissions, and full effect

Active Publication Date: 2015-06-17
浙江环发纺织印染有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cotton products dyed and processed by this method have better color uniformity, washing and rubbing fastness, which solves the defects of easy color flower and poor color fastness when conventional cotton products are dyed with low bath ratio vat dyes, and expands the range of vat dyes. Application scope of dyeing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Reduction and dissolution of dye: The dosage of vat dark blue K-VB is 1% (owf), caustic soda 10g / L, sodium hydroxide 8g / L, bath ratio 1:5; the dye solution is cooled after reduction treatment at 60℃ for 15 minutes, Add it to a dye cup (150ml) containing 2g of cotton knitted jersey.

[0024] (2) Exhaust oxygen in the dyeing device: Exhaust the air in the dye cup with nitrogen (aeration volume 450ml), and then seal the dye cup.

[0025] (3) Vat dye dyeing: The dyeing bath is heated to 60℃ at 1℃ / min, and the dyeing is continued for 30 minutes.

[0026] (4) Oxidation, soaping and drying: After dyeing, perform cold water washing first, then oxidize with 1g / L hydrogen peroxide (30%) for 5 minutes, and then wash with 1g / L soaping agent at 95℃ for 10 minutes, and finally Wash and dry in hot water.

[0027] Sample 1: Only processed by steps (1), (3) and (4);

[0028] Sample 2: Processed through steps (1)→(4).

[0029] After the above process, the dyeing depth (K / S) of sample 1 is 3.7...

Embodiment 2

[0031] (1) Reduction and dissolution of dyes: the dosage of Vat Olive Green K-VB is 1%, 2% (owf), caustic soda 12g / L, sodium hydroxide 10g / L, bath ratio 1:5, 1:10; reduction at 60℃ After 15 minutes, cool the dye solution and add it to a dye cup (150ml) containing 2g of cotton knitted jersey.

[0032] (2) Exhaust oxygen in the dyeing device: Exhaust the air in the dye cup with nitrogen (aeration volume 450ml), and then seal the dye cup.

[0033] (3) Vat dye dyeing: The dyeing bath is heated to 65℃ at 1℃ / min, and the dyeing is continued for 40 minutes.

[0034] (4) Oxidation, soaping and drying: After dyeing, perform cold water washing first, then oxidize with 1g / L hydrogen peroxide (30%) for 5 minutes, and then wash with 1g / L soaping agent at 95℃ for 10 minutes, and finally Wash and dry in hot water.

[0035] Sample 3: After processing steps (1), (3) and (4), the amount of dye is 2% (o.w.f), and the bath ratio is 1:10;

[0036] Sample 4: Processed in steps (1)→(4); the amount of dye is...

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Abstract

The invention discloses a dyeing method of cotton product reduced dye with low bath ratio and belongs to the textile dyeing and finishing processing technical field. The dyeing method aims to solve problems of large consumption of dyestuffs during dyeing of conventional cotton product reduced dyes and difficult control of surface color uniformity of dyed objects. The dyeing method employs nitrogen as protective gas. Based on elimination of air in a dyeing device, uniform adsorption and diffusion of reduced dye leuco compound sodium salt on cotton fiber are achieved. Combined with water washing, oxidation and soaping, dyeing of cotton product reduced dye with low bath ratio is finished. The concrete technological process comprises steps: reduction and dissolution of a dye, elimination of air in a dyeing device, dyeing of the reduced dye, oxidation, soaping and drying. When the dyeing method is compared to conventional dyeing technologies, the dyeing uniformity of cotton product dyed objects is improved; the dyeing depth and the dyeing fastness are increased; the consumption of dyestuffs is decreased under condition of the same surface color depth of dyed objects; the discharge of dyeing waste water is reduced; the production energy consumption is lowered.

Description

Technical field [0001] The invention relates to a method for dyeing cotton products with low bath ratio vat dyes, which is a method for dyeing cotton fibers with low bath ratio vat dyes using nitrogen as a protective gas to improve the dyeing quality of cotton products, and belongs to the technical field of textile dyeing and finishing . Background technique [0002] Vat dyes have better wet treatment fastness and light fastness than reactive dyes, and are mostly used for pad dyeing of cotton fabrics with higher fastness requirements. When cotton fabrics, cotton skeins or cheeses are dyed with vat dyes, the leuco body method is generally used, that is, the dye is fully reduced under a certain amount of caustic soda, soussonite and temperature, and then added to the main vat to start dyeing. The whole dyeing process is completed by washing, oxidizing and soaping. In the conventional semi-filled dip dyeing process, when the sodium salt of leuco body dyed on the fiber encounters t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P3/60D06P1/22D06P5/02
Inventor 王平蔡勇王树根王强崔莉袁久刚范雪荣
Owner 浙江环发纺织印染有限公司
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