Preparation method of white fabric

Abstract

The invention relates to a preparation method of a white fabric. The method is characterized by oxygen bleaching and whitening a fabric containing cotton, and comprises the steps of adding a one-bath-one-step method bleaching solution (prepared from 1 to 2g / L of penetrating agent, 1 to 2g / L of anti-creasing agent, 2 to 7 percent (owf) of scutching agent, 2 to 9 percent (owf) of 40 percent by weight caustic soda solution, and 3 to 6 percent (owf) of 30 percent by weight hydrogen peroxide solution) with pH being 10 to 11 into the fabric for oxygen bleaching, then adding a fluorescent whitening agent for whitening, heating at a constant heating rate to 80 to 90 DEG C, carrying out insulation treatment, and cleaning, neutralizing and setting to obtain the white fabric. According to the method,a step of removing hydrogen peroxide is saved, so that the process time can be greatly saved, the water consumption is reduced, and the emission of noxious substances is reduced; the prepared white fabric is free of acidity and less in storage color change, and has a pH value stabilized in an acceptability limit from 5.5 to 7.0, and the whiteness improved by 1 to 2 or more compared with a traditional process; when preparing the white fabric with the same whiteness, the dosage of the fluorescent whitening agent can be saved by 10 to 40 percent, so that the economic benefits of enterprises canbe greatly improved.

Description

technical field [0001] The invention relates to the field of textile printing and dyeing, in particular to a preparation method of white fabric. Background technique [0002] With labor costs increasing year by year, national environmental protection policies tightening and industry competition increasingly fierce, high energy consumption and high pollution enterprises, especially in the field of textile printing and dyeing, are faced with the survival decision of "or move abroad, or shut down production, or transform and upgrade". select. To this end, existing textile printing and dyeing enterprises need to improve their own production management level, promote the development and application of energy-saving and environmentally friendly dye auxiliaries, update outdated equipment, and optimize traditional technological processes, etc. consumption and reduce the pressure of sewage treatment, thereby improving the economic benefits of enterprises and promoting sustainable ec...

AI Technical Summary

Problems solved by technology

The traditional oxygen bleaching and whitening process is as described in CN105019220A, which adopts the re-bleaching and whitening process of the two-bath method. This process is lengthy, consumes more water, electricity, and steam, and finally needs to be cleaned, neutralized, and shaped In order to obtain white fabrics, and the whole process needs to be carried out at a high temperature above 95-100°C, which consumes a huge amount of energy and water. owf), and prone to processing defects such as scratches and creases

In addition, formaldehyde is contained in the auxiliary agent of its resin setting process, which is no longer suitable for the production requirements of green environmental protection, clean production, energy saving and consumption reduction

CN101935945B provides a one-bath two-step oxygen bleaching and whitening process, which combines oxygen bleaching and the process of decomposing excessive hydrogen peroxide by adding cobalt chloride aqueous solution into one, preventing hydrogen peroxide from affecting the subsequent printing and dyeing process, and can save a cleaning process. The step of removing hydrogen peroxide, and then adding fluorescent whitening agent for whitening, reduces the amount of bleaching water and process operation time. However, because cobalt chloride dissolves in water to obtain a red transparent solution, it is easy to adsorb on the surface of the fabric, reducing the bleaching of the fabric. whiteness, moreover, cobalt ions are heavy metal ions, and their discharge into the environment will have a great impact on water sources and the ecological environment

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