A novel low-temperature oxygen bleaching catalyst and its preparation method and application

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 textile types in my country. In order to obtain high-quality dyeing, printing and finishing products, the grey fabric needs to be pre-treated to remove various impurities on the grey fabric. In the conventional pretreatment of cotton fabrics, the high-temperature alkaline oxygen one-bath process with hydrogen peroxide as the bleaching agent is mainly used. 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. Large amount of problems. In recent years, under the trend of energy saving, emission reduction...

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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.

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