Pure cotton fabric vat dye dyeing method

Abstract

A pure cotton fabric vat dye dyeing method includes the following steps of firstly, preparing fabric; secondly, conducting pretreatment on the fabric; thirdly, preparing a vat dye leuco body solution; fourthly, conducting dip dyeing on vat dye; fifthly, conducting soaping; sixthly, conducting after treatment, wherein dip dyeing is conducted on vat dye in the fourth step, deoxygenation is conducted in a dyeing device, nitrogen is introduced into the dyeing device, the dyeing device is then sealed, pure cotton fabric where pretreatment is conducted is placed in the leuco body solution of vat dye, the temperature is raised to 60 DEG C at the temperature rise speed of 1 DEG C per minute, heat preservation is conducted for 12minutes, 2.5 g / L salt is added, dyeing continues to be conducted for 12 minutes, dyeing is finished, and dyed pure cotton fabric is oxidized in air and then washed through cold water.

Description

[0001] This application is a divisional application of the invention patent application with the application number 2014103046825, the application date is June 30, 2014, and the invention title is "a method for dyeing pure cotton fabric with vat dyes". technical field

[0002] The invention relates to the field of dyeing cotton fabrics, in particular to a method for dyeing pure cotton fabrics with vat dyes. Background technique

[0003] Vat dyes are commonly used dyes in modern printing and dyeing factories. They have a long history, and our country has been dyed with plant vat dye indigo very early. Vat dyes are insoluble in water and generally have two or several conjugated carbonyl groups in their conjugated system. Under alkaline conditions, the carbonyl group is reduced, and the dye can become a water-soluble leucosome sodium salt, referred to as leucosome. The leuco body dyes the cellulose fiber, and after oxidation, the leuco body returns to an insoluble dye and fix...

Examples

Embodiment 1

[0026] Select pure cotton fabric, the warp and weft densities are 28 threads / cm, 27 threads / cm, the seam head, the stitch density is 35cm / needle, and the thread length at both ends of the seam head is 4cm; the pretreatment liquid includes sodium hypochlorite 12g / L, polyoxygen Ethylene alkylphenol ether 2g / L, potassium permanganate 0.2g / L after padding, the liquid carrying rate is 80%, and then stacked at a constant temperature of 90°C for 45min, and then use polyoxyethylene ether fatty alcohol ether 2g / L and oxalic acid Wash thoroughly with 1g / L hot solution for 5 minutes, then wash twice with cold water. Firstly, 2wt% vat dyes are made into slurry with Swire oil, and then diluted with water according to the fabric to bath ratio of 1:10, then add thiourea dioxide 3g / L, isotridecyl alcohol polyoxyethylene ether 2g / L, glucose 1g / L, sodium silicate 2g / L, sodium sulfide 1g / L, heat up to 45°C at a rate of 1°C / min while stirring, and fully reduce the dye for 20min to obtain the leuc...

Embodiment 2

[0028] Select pure cotton fabric, the warp and weft density is 28 threads / cm, 27 threads / cm, the seam head, the stitch density is 35cm / needle, and the thread length at both ends of the seam head is 3cm; the pretreatment liquid includes sodium hypochlorite 12g / L, polyoxygen Ethylene alkylphenol ether 2g / L, potassium permanganate 0.2g / L after padding, the liquid carrying rate is 80%, and then stacked at a constant temperature of 90°C for 45min, and then use polyoxyethylene ether fatty alcohol ether 2g / L and oxalic acid Wash thoroughly with 1g / L hot solution for 5 minutes, then wash twice with cold water. Then add swire oil dropwise to 2wt% reduced indigo to make a slurry, then dilute with water, then add 3wt% sodium bicarbonate, 6wt% thiourea dioxide, and 6g / L caustic soda, stir and heat up to 45°C to make the dye fully After reducing for 20 minutes, the leuco solution of the vat dye can be obtained; soak the pure cotton fabric, then place it in the leuco solution of the vat dye...

Embodiment 3

[0031] See Table 1 for effect comparison

[0032] Table 1

[0033]

K / S value Example 1 12.17 Example 2 4.52 Example 3 5.23

[0034] Among them, compared with the traditional compounding process of sodium hydrosulfite and thiourea dioxide, the deepening ratio of K / S value after dyeing of the present invention is (12.17-4.52) / 4.52=169%.

[0035] Compared with the traditional compounding process of sodium sulfide and thiourea dioxide, the deepening ratio of K / S value after dyeing of the present invention is (12.17-5.23) / 5.23=133%.

[0036] It can be seen that the dyeing effect of vat dyes can be significantly improved by adopting the dyeing method of the present invention.

[0001] This application is a divisional application of the invention patent application with the application number 2014103046825, the application date is June 30, 2014, and the invention title is "a method for dyeing pure cotton fabric with vat dyes". technical field

[0002] The invention relates to the field of dyeing cotton fabrics, in particular to a method for dyeing pure cotton fabrics with vat dyes. Background technique

[0003] Vat dyes are commonly used dyes in modern printing and dyeing factories. They have a long history, and our country has been dyed with plant vat dye indigo very early. Vat dyes are insoluble in water and generally have two or several conjugated carbonyl groups in their conjugated system. Under alkaline conditions, the carbonyl group is reduced, and the dye can become a water-soluble leucosome sodium salt, referred to as leucosome. The leuco body dyes the cellulose fiber, and after oxidation, the leuco body returns to an insoluble dye and fix...

Examples

Embodiment 1

[0026] Select pure cotton fabric, the warp and weft densities are 28 threads / cm, 27 threads / cm, the seam head, the stitch density is 35cm / needle, and the thread length at both ends of the seam head is 4cm; the pretreatment liquid includes sodium hypochlorite 12g / L, polyoxygen Ethylene alkylphenol ether 2g / L, potassium permanganate 0.2g / L after padding, the liquid carrying rate is 80%, and then stacked at a constant temperature of 90°C for 45min, and then use polyoxyethylene ether fatty alcohol ether 2g / L and oxalic acid Wash thoroughly with 1g / L hot solution for 5 minutes, then wash twice with cold water. Firstly, 2wt% vat dyes are made into slurry with Swire oil, and then diluted with water according to the fabric to bath ratio of 1:10, then add thiourea dioxide 3g / L, isotridecyl alcohol polyoxyethylene ether 2g / L, glucose 1g / L, sodium silicate 2g / L, sodium sulfide 1g / L, heat up to 45°C at a rate of 1°C / min while stirring, and fully reduce the dye for 20min to obtain the leuc...

Embodiment 2

[0028] Select pure cotton fabric, the warp and weft density is 28 threads / cm, 27 threads / cm, the seam head, the stitch density is 35cm / needle, and the thread length at both ends of the seam head is 3cm; the pretreatment liquid includes sodium hypochlorite 12g / L, polyoxygen Ethylene alkylphenol ether 2g / L, potassium permanganate 0.2g / L after padding, the liquid carrying rate is 80%, and then stacked at a constant temperature of 90°C for 45min, and then use polyoxyethylene ether fatty alcohol ether 2g / L and oxalic acid Wash thoroughly with 1g / L hot solution for 5 minutes, then wash twice with cold water. Then add swire oil dropwise to 2wt% reduced indigo to make a slurry, then dilute with water, then add 3wt% sodium bicarbonate, 6wt% thiourea dioxide, and 6g / L caustic soda, stir and heat up to 45°C to make the dye fully After reducing for 20 minutes, the leuco solution of the vat dye can be obtained; soak the pure cotton fabric, then place it in the leuco solution of the vat dye...

Embodiment 3

[0031] See Table 1 for effect comparison

[0032] Table 1

[0033]

K / S value Example 1 12.17 Example 2 4.52 Example 3 5.23

[0034] Among them, compared with the traditional compounding process of sodium hydrosulfite and thiourea dioxide, the deepening ratio of K / S value after dyeing of the present invention is (12.17-4.52) / 4.52=169%.

[0035] Compared with the traditional compounding process of sodium sulfide and thiourea dioxide, the deepening ratio of K / S value after dyeing of the present invention is (12.17-5.23) / 5.23=133%.

[0036] It can be seen that the dyeing effect of vat dyes can be significantly improved by adopting the dyeing method of the present invention.