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Liquid paraffin bath dyeing method of cotton fiber

A technology of liquid paraffin and dyeing method, applied in the field of dyeing and finishing, which can solve the problems of high alkalinity in dyeing wastewater, complicated dyeing process, and large water consumption, and achieve the effects of reducing derivative costs, simple dyeing process, and low consumption of auxiliaries

Active Publication Date: 2017-02-01
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a liquid paraffin bath dyeing method for cotton fibers, aiming at problems such as low dyeing rate of vat dyes, complex dyeing process, large water consumption, high alkalinity of dyeing wastewater, large amount of pollution, and difficult treatment. Provide a cotton fiber vat dyeing method that does not require auxiliary agents to promote dyeing in the dyeing process, has a high dye uptake rate, consumes less water and chemicals, saves costs, and significantly reduces the discharge of dyeing wastewater

Method used

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  • Liquid paraffin bath dyeing method of cotton fiber
  • Liquid paraffin bath dyeing method of cotton fiber
  • Liquid paraffin bath dyeing method of cotton fiber

Examples

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Effect test

Embodiment 1

[0027] A liquid paraffin bath dyeing method for cotton fibers, comprising the steps of:

[0028] (1) Pretreatment of cotton fibers: take 2g of scoured cotton fibers, smooth and loose them with a brush, put them into deionized water to soak and swell, control the liquid-carrying rate of cotton fibers to 120%, and prepare for dyeing;

[0029] (2) Preparation of high-concentration vat blue 1 leuco body solution: prepare high-concentration vat blue 1 leuco body solution by using dry vat reduction method, and accurately weigh each drug according to the formula in Table 1. Add 0.6g of caustic soda and 1.6g of sodium hydrosulfite to 20mL of deionized water, stir in a 50°C constant temperature water bath to dissolve to obtain a reducing solution, then add 0.2g of Vat Blue 1 dye to the reducing solution, and seal it with an appropriate amount of liquid paraffin. , and reduced at a constant temperature of 50°C for 20 minutes to prepare a 10 g / L Vat Blue 1 leuco body solution for future ...

Embodiment 2

[0038] The difference from Example 1 is that the preparation conditions of the high-concentration vat blue 1 leucosome in step (2) are different from the dyeing conditions of cotton fibers in step (3). Other conditions are the same as in Example 1.

[0039] Step (2) The formula for preparing a high-concentration vat blue 1 leuco body solution is shown in Table 3. The reduction condition is: reduction at 60°C for 10 minutes at a constant temperature.

[0040] Table 3 prepares the formula of high concentration (30g / L) vat blue 1 leuco body solution

[0041]

[0042] In step (3), the dyeing temperature is 80° C., and the dyeing time is 50 min.

Embodiment 3

[0044] The difference from Example 1 is that the dye used is vat violet 2R; step (2) preparation of a high-concentration vat violet 2R leuco solution is shown in Table 4, and the reduction condition is 30 min at a constant temperature of 60°C; The dyeing condition of step (3) cotton fiber is temperature 60 ℃, time 50min. Other conditions are the same as in Example 1.

[0045] Table 4 prepares the formula of high concentration (40g / L) reduced brilliant violet 2R leucosome solution

[0046]

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Abstract

The invention discloses a liquid paraffin bath dyeing method of cotton fiber. The method is applied to a liquid paraffin bath for performing reduction dye dyeing on the cotton fiber, due to the fact that liquid paraffin and water are completely immiscible, both the cotton fiber and a reduction dye leuco body have the good compatibility with water, and leuco body droplets dispersing in the liquid paraffin have the intense tendency of being repellent to the liquid paraffin and compatible to the cotton fiber, and the reduction dye leuco body can be spontaneously transferred to the surface of the fiber from the liquid paraffin solution and then dispersed into the fiber. The adopted liquid paraffin is low in cost, safe, environmentally friendly and recyclable. According to the method, the dye-uptake rate of the reduction dye is greatly increased, the leuco body and oxidizing substances are isolated in the dyeing process, oxidation of the leuco body and losses of sodium hydrosulfite are effectively avoided, and the production cost is remarkably reduced. More importantly, the method greatly reduces water for dyeing and wastewater discharge and meets the development requirement for ecological dyeing and finishing.

Description

technical field [0001] The invention belongs to the technical field of dyeing and finishing, and in particular relates to a vat dye liquid paraffin bath dyeing method for cotton fibers. Background technique [0002] Vat dyes have the advantages of bright color and high color fastness to washing, and are an important class of dyes for cotton fiber and its products. The dyeing process of vat dyes generally includes four steps: reduction and dissolution of dyes, dyeing of leucosomes, oxidation of leucosomes, and post-soaping treatment. The vat dye leuco is soluble in water, and the pigment anion is adsorbed on the surface of the fiber through hydrogen bonds and van der Waals force, and diffuses into the fiber. After dyeing, the leuco is transformed into an insoluble dye lake through the oxidation process and fixed on the fiber. superior. Conventional vat dyeing is carried out in a water bath, and the reduction process requires the application of a large amount of caustic soda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/92D06P1/22D06P3/60D06P5/02D06P5/10
CPCD06P1/22D06P1/922D06P3/003D06P3/6025D06P5/02D06P5/10
Inventor 邵建中朱振旭刘今强周岚黄益
Owner ZHEJIANG SCI-TECH UNIV
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