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Novel low-temperature oxygen bleaching catalyst and preparation method and application thereof

A catalyst and oxygen bleaching technology, applied in textiles and papermaking, etc., can solve the problems of complex synthesis process, fiber damage, high dosage, etc., and achieve the effect of shortening the process flow and stabilizing the structure

Active Publication Date: 2018-07-17
TAICANG BAONI IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent "A Preparation Method for Low-Temperature Bleaching Catalyst Ligand" (publication number: CN102391199A) synthesized 1,4,7-trimethyl-1,4,7-triazacyclononane ligand, which belongs to macrocyclic poly Amines, the synthesis process is complex and the cost is high; the patent "A Method for Low-Temperature Activation Bleaching Using Schiff Base Metal Complexes" (publication number: CN101922109B) uses sulfosalicylaldehyde ethylenediamine copper complexes as catalysts, Used for low-temperature oxygen bleaching, it has a certain effect, but the structure of the Schiff base metal complex is unstable; the patent "a cotton fabric scouring and bleaching process using heavy metal ions and polyphosphate as a catalyst" (public number: CN103276583A) uses heavy metal Ions and polyphosphate complexes are used as catalysts to realize low-temperature oxygen bleaching, but containing phosphorus is not conducive to environmental protection; the patent "a low-temperature hydrogen peroxide catalyst and its preparation method and application" (publication number: CN105597826A) uses chitosan as Ligand, N-methyl morpholine oxide is an auxiliary coordination and metal ion complexation as a catalyst, but N-methyl morpholine oxide has good solubility to cellulose, and under strong alkali and certain temperature, it will cause fiber In addition, the catalysts synthesized in the above patents are all mononuclear metal structures, and the dosage is relatively high, mostly in the range of 20-1000 μmol / L, and the catalytic efficiency is insufficient.

Method used

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  • Novel low-temperature oxygen bleaching catalyst and preparation method and application thereof

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preparation example Construction

[0026] In a preferred embodiment, the preparation method of low-temperature oxygen bleaching catalyst of the present invention for example comprises the following steps:

[0027] 1) Take 10-100g of clay material, under normal temperature conditions, impregnate and stir with 1mol / L NaCl solution for 8-12h, then suction filter, and wash with deionized water;

[0028] 2) Add the product in 1) into an ethanol solution of zinc salt, impregnate and stir for 8-12 hours, filter and dry, and set aside;

[0029] 3) Take another ethanol solution of the following substance A, stir, slowly add a certain proportion of the ethanol solution of the following substances B and C dropwise, reflux and stir for 2-5 hours, and obtain the bis-Schiff base ligand;

[0030] 4) Take a certain amount of bis-Schiff base ligand, add the zinc salt-loaded clay prepared in 2), after reflux reaction for 1-3h, then add the ethanol solution of copper salt, continue reflux reaction for 1-3h, and cool to room tempe...

Embodiment 1

[0066] 1. Preparation of low-temperature oxygen bleaching catalyst: Take 20g of bentonite, impregnate and stir with 100ml, 1mol / L NaCl solution for 8 hours, then filter with suction, wash with deionized water; add 200ml, 10g / L zinc chloride ethanol solution, impregnate and stir for 10 hours , filtered and dried. Take 10mmol of m-phthalaldehyde and 15ml of absolute ethanol, stir at room temperature, add dropwise 15ml of ethanol solution containing 8.5mmol of 2,4-dihydroxybenzylamine, reflux and stir for 2.5h, then add dropwise 20ml of 3- The ethanol solution of hydroxy-4-aminopyridine was refluxed for 3 hours to obtain the bis-Schiff base ligand; 15 g of loaded Zn 2+ Ionic bentonite, reflux for 1.5h, then add 10mmol copper acetate, reflux for 2h, cool to room temperature, and remove the solvent.

[0067] 2. Application of the above-mentioned low-temperature oxygen bleaching catalyst:

[0068] 1) Preparation of oxygen bleaching working solution: same as traditional process;

...

Embodiment 2

[0072] 1. Preparation of low-temperature oxygen bleaching catalyst: Take 40g of attapulgite, impregnate and stir with 100ml, 1mol / L NaCl solution for 10h, then suction filter, wash with deionized water; add 200ml, 10g / L ethanol solution of zinc acetate, impregnate and stir for 10h After that, filter and dry. Take 10mmol of terephthalaldehyde and 15ml of absolute ethanol, stir at room temperature, dropwise add 15ml of ethanol solution containing 9.0mmol of 3,4-dihydroxybenzylamine, reflux and stir for 4 hours, then add dropwise 20ml of 2-amino The ethanol solution of -5-hydroxymethylpyridine was refluxed for 4 hours to obtain the bis-Schiff base ligand; 30 g of loaded Zn was added 2+ Ionic attapulgite, reflux for 2 hours, then add 10 mmol of copper nitrate, reflux for 1.5 hours, cool to room temperature, and remove the solvent.

[0073] 2. Application of the above-mentioned low-temperature oxygen bleaching catalyst:

[0074] 1) Preparation of oxygen bleaching working solution...

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Abstract

The invention discloses a novel low-temperature oxygen bleaching catalyst and a preparation method and application thereof. The low-temperature oxygen bleaching catalyst includes clay and a hetero-binuclear Schiff base complex loaded on the clay. The low-temperature oxygen bleaching catalyst is used for bleaching cotton-type fabric and is low in consumption and great in bleaching effect. Comparedwith a traditional 98 DEG C process, the catalyst has the advantage that the whiteness of the bleached fabric is slightly higher, energy consumption is significantly reduced at the low temperature of60-80 DEG C, the strength drop rate of the fabric is not higher than 10%, and fiber damage is smaller; a working raffinate after bleaching is neutral, thus there is no need to carry out acid neutralization and water washing, and the process flow is decreased. The catalyst is stable in structure, and it is proved by a same process for testing the performance of the catalyst after the catalyst is placed for six months that the bleaching effect of the catalyst has no obvious decline.

Description

technical field [0001] The invention relates to a novel low-temperature oxygen bleaching catalyst and its preparation method and application, belonging to the field of textile printing and dyeing pretreatment. Background technique [0002] Because of its excellent performance, cotton fabric is one of the important types of textiles in my country. In order to obtain high-quality dyed, printed and finished products, it is necessary to pre-treat the gray cloth to remove various impurities on the gray cloth. In the conventional pretreatment of cotton fabrics, the high-temperature alkali-oxygen one-bath process with hydrogen peroxide as the bleaching agent is mainly used, and the effect is excellent, but at the same time, the high-temperature and strong alkali conditions will cause the cellulose macromolecular chain to break, damage the fabric, and cause energy consumption and sewage discharge. volume problem. In recent years, under the trend of energy saving, emission reduction...

Claims

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Application Information

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IPC IPC(8): D06L4/12D06L4/13
CPCD06L4/12D06L4/13
Inventor 杨天乔李正雄
Owner TAICANG BAONI IND CO LTD
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