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Dyeing defect positioning and stripping method for real silk fabric

A silk fabric and color stripping technology, applied in dyeing method, textile and papermaking, bleaching products, etc., can solve the problems of difficult to destroy the structure, damage to silk fibers, and difficult to strip dyes.

Inactive Publication Date: 2006-02-08
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of some dye molecules is difficult to destroy, and the dye is difficult to strip off. It takes multiple stripping to strip the dye on the fiber, but multiple stripping will seriously damage the silk fiber.

Method used

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  • Dyeing defect positioning and stripping method for real silk fabric
  • Dyeing defect positioning and stripping method for real silk fabric
  • Dyeing defect positioning and stripping method for real silk fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] For light-colored silk dyed with defective silk, first use pre-media treatment, pre-media treatment agent and process conditions: heptacrystalline water ferrous sulfate 5g / L, 100% hypophosphorous acid 0.5g / L, the rest is water, adjust PH with formic acid To 3-3.5, treat at a temperature of 60°C for 45 minutes. After the pre-medium treatment, rinse at a temperature of 60°C for 15 minutes; on this basis, carry out hydrogen peroxide stripping and bleaching treatment, oxygen bleaching agent and process conditions: 100% concentration of hydrogen peroxide 1.5ml / L, pentacrystalline sodium silicate 5g / L, the rest is water, adjust the pH of the oxygen bleach solution to 8-9, and treat it for 90 minutes at a temperature of 75°C. After oxygen bleaching, adjust the pH of the bleaching solution to 4-5, add 2g / L thiourea, and treat it at 45°C for 45 minutes; finally adjust the pH of the bleaching solution to 8, and perform reduction bleaching after oxygen bleaching at 70°C 45min. ...

Embodiment 2

[0067] For light-colored silk dyed with defective silk, first use pre-media treatment, pre-media treatment agent and process conditions: heptacrystalline water ferrous sulfate 8g / L, 100% hypophosphorous acid 2g / L, the rest is water, use formic acid to adjust the pH to 3-3.5, treat at a temperature of 80°C for 60 minutes. After the pre-media treatment, rinse at a temperature of 80°C for 20 minutes; on this basis, carry out hydrogen peroxide stripping and bleaching treatment, oxygen bleaching agent and process conditions: 100% hydrogen peroxide 3.5ml / L, pentacrystalline sodium silicate 4g / L, the rest is water, adjust the pH of the oxygen bleach solution to 8-9, and treat it for 60 minutes at a temperature of 70°C. After oxygen bleaching, adjust the pH of the bleaching solution to 4-5, add 3g / L thiourea, and treat it at 60°C for 20min; finally adjust the pH of the bleaching solution to 8.5, and restore it after oxygen bleaching at 60°C Bleach for 30min. The peeling whiteness o...

Embodiment 3

[0069] For light-colored silk dyed with defective silk, first use pre-media treatment, pre-media treatment agent and process conditions: 10g / L of ferrous sulfate in heptacrystalline water, 1g / L of 100% hypophosphorous acid, the rest is water, adjust the pH to 3-3.5, treat at a temperature of 70°C for 50 minutes. After the pre-medium treatment, rinse at a temperature of 70°C for 30 minutes; on this basis, carry out hydrogen peroxide stripping and bleaching treatment, oxygen bleaching agent and process conditions: 100% hydrogen peroxide 4ml / L, pentacrystalline sodium silicate 5g / L , the rest is water, the pH of the oxygen bleach solution is adjusted to 8-9, and the temperature is 80°C, and it is treated for 45 minutes. After oxygen bleaching, adjust the pH of the bleach solution to 4-5, add 5g / L thiourea, and treat it at 75°C for 15 minutes; finally adjust the pH of the bleach solution to 9, and perform reduction bleaching after oxygen bleaching at 80°C 15min. The peeling whit...

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Abstract

The present invention discloses method of locating and eliminating dyeing defect for silk fabric and solves the technological problem of eliminating dyeing defect from silk fabric without obvious damage on the strength of the silk fiber. The method includes the following steps: treating the silk fabric with dyeing defect with catalyst metal salt to make the dye adsorb the catalyst metal salt; rinsing to eliminate the catalyst metal salt adsorbed onto the silk protein while maintaining the catalyst metal salt adsorbed onto the dye molecules; oxidizing and stripping with hydrogen peroxide solution; reducing and eliminating color with thiourea to eliminate dyeing defect; and water washing. Thus treated silk fabric has whiteness over 68 and silk strength maintaining rate over 71 %.

Description

technical field [0001] The invention relates to the technical field of color stripping and bleaching of silk fabrics, in particular to a method for locating and stripping silk fabric dyeing defects. Background technique [0002] The dye molecule contains a chromogenic gene composed of several conjugated double bonds, and the dye can display color due to the existence of these chromogenic genes in the dye molecule. Utilizing the strong oxidizing property of hydrogen peroxide under alkaline conditions, the conjugated system on the dye molecule can be oxidized and destroyed, thereby achieving achromaticity. At the same time, the molecular structure of the dye is destroyed and becomes smaller due to the oxidation of hydrogen peroxide, and the binding force with the fiber is weakened, and the dye is easily desorbed from the fiber to the solution to achieve a completely clean color. [0003] During the dyeing and finishing process of real silk, there will inevitably be some dyein...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D06L3/00D06P5/15D06L4/12D06L4/13D06L4/30D06L4/70
Inventor 吴明华常晓虹
Owner ZHEJIANG SCI-TECH UNIV
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