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Reduction system for protein fiber stripping or bleaching and stripping or bleaching method

A protein fiber and system technology, applied in the field of dyeing and finishing, can solve the problems of failing to meet the requirements of bleaching or color stripping, weak alkalinity, limiting the reducing ability of thiourea dioxide, etc., and achieves less fiber damage, low processing cost, and safe use. Effect

Inactive Publication Date: 2015-07-29
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sodium carbonate used in this patent is itself a weak base, and the alkalinity of sodium bicarbonate is weaker than it. When used in conjunction with thiourea dioxide, it will limit the reducing ability of thiourea dioxide, which cannot meet the requirements of bleaching or stripping in the printing and dyeing industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Gray cloth bleaching

[0039] (1) Traditional sodium bicarbonate bleaching

[0040] At room temperature, add 120ml of water and 12% (o.w.f.) bleaching powder (composed of 60% hydrosulfuric acid and 40% sodium pyrophosphate) to 4.0g of rough cloth soaked by penetrant, heat up to 80°C in 45min, keep warm for 90min, and cool down cleaning.

[0041] (2) Thiourea dioxide and trisodium phosphate, sodium silicate, sodium carbonate bleached gray cloth

[0042] Prepare the bleach solution as follows: thiourea dioxide 0.05 mol / L, trisodium phosphate 0.03 mol / L, sodium silicate 0.015 mol / L, sodium carbonate 0.01 mol / L, and the volume of the bleach solution is 120 ml. Shake and heat the prepared bleach solution to 80°C, put 4.0g of rough cloth soaked in penetrant into it, and treat it for 20 minutes.

[0043] Use the WSD-3 whiteness meter to test the whiteness value and yellowness index of the bleached fabric, wherein the whiteness test is based on "GB / T 8424.2-2001 T...

Embodiment 2

[0046] Embodiment 2: silk gray cloth bleaching

[0047] (1) Traditional hydrogen peroxide bleached silk gray fabric

[0048] The bleach solution is prepared as follows: 28%-30% hydrogen peroxide 0.14mol / L, sodium silicate 0.02mol / L, and the volume of the bleach solution 100ml. Shake and heat the prepared bleach solution to 80°C, put 2.0g of silk gray cloth soaked in penetrant into it, and treat it for 6 hours.

[0049] (2) Thiourea dioxide, trisodium phosphate, sodium silicate, soda ash bleached gray silk fabric

[0050] Prepare the bleach solution as follows: thiourea dioxide 0.10mol / L, trisodium phosphate 0.03mol / L, sodium silicate 0.01mol / L, soda ash 0.01mol / L, and the volume of the bleach solution is 120ml. Shake and heat the prepared reducing solution to 60°C, put 2.0g of silk gray cloth soaked in penetrant into it, and treat it for 30 minutes.

[0051]Use the WSD-3 whiteness meter to test the whiteness value and yellowness index of the bleached fabric, wherein the whi...

Embodiment 3

[0054] Example 3: Stripping of wool tops dyed with Lanasol dyes

[0055] Lanasol dyes used and amounts: Lanasol Red 2G 1.6% (o.w.f.), Lanasol Yellow 4G 0.5% (o.w.f.).

[0056] (1) Peeling off the color of traditional sulfite

[0057] Make stripping solution as follows: hydrosulfite 0.03mol / L, volume of stripping solution 200ml. Shake and heat the prepared reducing solution to 80°C, then put 2.0g of colored wool strips soaked in penetrant, and rinse with cold water after treatment for 30 minutes.

[0058] (2) Thiourea dioxide and trisodium phosphate, sodium silicate, soda ash stripping

[0059] Prepare the stripping solution as follows: 0.20 mol / L thiourea dioxide, 0.04 mol / L trisodium phosphate, 0.03 mol / L sodium silicate, 0.03 mol / L soda ash, and 200 ml volume of the stripping solution. Shake and heat the prepared reducing solution to 80°C, then put 2.0g of colored wool strips soaked in penetrant, and rinse with cold water after treatment for 30 minutes.

[0060] The stri...

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PUM

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Abstract

The invention discloses a reduction system for protein fiber stripping or bleaching and a stripping and bleaching method. The reduction system is aqueous solution of thiourea dioxide and weak base, that is, the thiourea dioxide and weak base serve as solute, water serves as solvent, and the weak base is a mixture of trisodium phosphate, sodium silicate and sodium carbonate; the concentration of the thiourea dioxide is 0.05 mol / L-0.2 mol / L, and the concentration of the weak base is 0.01 mol / L-0.10 mol / L. The bleaching method comprises the step of adopting the reduction system as bleaching liquid to treat protein fiber; the stripping method comprises the step of adopting the reduction system as stripping liquid to treat dyed protein fiber. According to the invention, the synergistic effect of three types of weak bases is utilized, so that the alkalinity of the system is reduced, the stripping, bleaching and impurity removing capacities are enhanced, and the strength loss of a textile is reduced.

Description

technical field [0001] The invention relates to the field of dyeing and finishing, in particular to a reducing system for stripping or bleaching protein fibers and a stripping or bleaching method. Background technique [0002] Protein fiber refers to a type of fiber whose basic component is protein. Since the amphoteric structure of protein determines that the fiber has better acid resistance and poor alkali resistance, it is generally carried out under acidic or neutral conditions in the dyeing and finishing process. [0003] Color stripping is generally caused by protein fibers and their products during the dyeing process, resulting in stains, color flowers, color spots, color difference, and uneven dyeing, which affect the quality of dyed products. In order to improve these phenomena, the factory strips and then dyes back. build. The main purpose of bleaching protein fibers and their products is to destroy the pigments on the fibers and remove accompanying impurities, so...

Claims

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Application Information

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IPC IPC(8): D06L3/10D06L4/30
Inventor 王然王柏华汪礼聂素双杜迎春
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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