Method for low-temperature activated bleaching by using Schiff base metal complexes

A technology of alkali metal complexes and metal complexes, applied in the field of low-temperature activated bleaching, can solve the problems of immature application, difficult penetration, low process temperature, etc., and achieve the effect of reducing the pH of the working liquid and shortening the stacking time

Active Publication Date: 2010-12-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Disadvantages of conventional cold pad batch bleaching: low process temperature, high alkali concentration, difficult penetration, and the current pretreatment time of cold pad batch is mostly about 24h, and the production efficiency is low
The products that have been industrialized on the market are mainly (tetraacetyl) ethylenediamine (TAED) and sodium nonanoylbenzene sulfonate (NOBS). The application of hydrogen peroxide bleaching pretreatment is not very mature

Method used

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  • Method for low-temperature activated bleaching by using Schiff base metal complexes
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  • Method for low-temperature activated bleaching by using Schiff base metal complexes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation and padding steps of bleaching working solution: the composition ratio of this bleaching working solution is: 30% H 2 o 2 Dosage: 30g / L; Dosage of sulfosalicylaldehyde ethylenediamine Schiff base copper complex: 21μmol / L; Dosage of penetrant: 2g / L; Dosage of stabilizer: 0.2g / L; Adjust the pH of the working solution to 7.

[0038] (2) Padding step: the pure cotton semi-bleached cloth is soaked and rolled twice in a uniform padding machine with the working solution prepared in the above (1), and the liquid-carrying rate is 95%.

[0039] (3) Steaming step: the steaming temperature is 80° C., and the steaming time is 1 hour.

[0040] (4) Water washing: wash the steamed cotton fabric twice with hot water at 50° C. to 80° C., and then fully wash it with cold water.

Embodiment 2

[0042] (1) Preparation and padding steps of bleaching working solution: the composition ratio of this bleaching working solution is: 30% H 2 o 2 Dosage: 30g / L; Dosage of sulfosalicylaldehyde ethylenediamine Schiff base copper complex: 18μmol / L; Dosage of penetrant: 2g / L; Dosage of stabilizer: 0.2g / L; Adjust the pH of the working solution to 9.

[0043] (2) Padding step: the pure cotton semi-bleached cloth is soaked and rolled twice in a uniform padding machine with the working solution prepared in the above (1), and the liquid-carrying rate is 95%.

[0044] (3) Steaming step: the steaming temperature is 80° C., and the steaming time is 1.5 hours.

[0045] (4) Water washing: wash the steamed cotton fabric twice with hot water at 50° C. to 80° C., and then fully wash it with cold water.

Embodiment 3

[0047] (1) Preparation and padding steps of bleaching working solution: the composition ratio of this bleaching working solution is: 30% H 2 o 2 Dosage: 30g / L; Dosage of sulfosalicylaldehyde ethylenediamine Schiff base copper complex: 15μmol / L; Dosage of penetrant: 2g / L; Dosage of stabilizer: 0.2g / L; Adjust the pH of the working solution to 9.

[0048] (2) Padding step: the pure cotton semi-bleached cloth is soaked and rolled twice in a uniform padding machine with the working solution prepared in the above (1), and the liquid-carrying rate is 95%.

[0049] (3) Steaming step: the steaming temperature is 75° C., and the steaming time is 1 hour.

[0050] (4) Water washing: wash the steamed cotton fabric twice with hot water at 50° C. to 80° C., and then fully wash it with cold water.

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Abstract

The invention relates to a method for low-temperature activated bleaching by using Schiff base metal complexes, belonging to the field of methods for low-temperature activated bleaching. The method comprises the following steps: (1) taking the Schiff base metal complexes, 20-50g/L of H2O2, penetrating agents and stabilizing agents and then mixing the substances to obtain bleaching operating fluid with pH value of 7-11; (2) padding the fabrics in the bleaching operating fluid; and (3) carrying out cold pad-batch or steaming on the padded fabrics and then washing the fabrics with water. The method is simple, low in cost, high in production efficiency, environment-friendly, energy-saving and suitable for industrialization and reduces the bleaching temperature, shortens the stacking time and reduces the fabrics damage under the premise of achieving good bleaching effect.

Description

technical field [0001] The invention belongs to the field of low-temperature activated bleaching methods, in particular to a low-temperature activated bleaching method using a Schiff alkali metal complex. Background technique [0002] Hydrogen peroxide bleaching is an important process in the pretreatment of textiles. The bleached fabric has high whiteness, no yellowing, and little environmental pollution, so it is widely used in the pretreatment bleaching process of various fabrics. [0003] Conventional hydrogen peroxide bleaching includes: high temperature bleaching and cold pad batch bleaching. [0004] 1 The technological process of high-temperature bleaching: padding with hydrogen peroxide bleach → steaming → water washing. [0005] Bleach solution H 2 o 2 (100%) 2-15g / L, adjust the pH to 10.5-11 with NaOH, add a proper amount of stabilizer and wetting agent, pad the bleaching solution at room temperature, steam at 95-100°C for 45-60min, and then wash the cloth. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06L3/02D06L3/16D06L4/12D06L4/13
Inventor 毛志平李静妍张琳萍徐红钟毅尹冲李改莉任参郑玢白亚莉
Owner DONGHUA UNIV
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