Environment-friendly paste discharge agent for textile printing and preparation method thereof

Abstract

The invention discloses an environment-friendly paste discharge agent for textile printing and a preparation method thereof. The environment-friendly paste discharge agent comprises the following components in parts by weight: 30-60 parts of decamethyl cyclopentasiloxane, 40-70 parts of thiourea dioxide, 1-3 parts of surfactant and 3-6 parts of glycerin. The preparation method comprises the steps: putting the decamethyl cyclopentasiloxane into a ball grinder container; adding the surfactant to be uniformly dispersed or dissolved and uniformly agitated; and then adding the thiourea dioxide into the ball grinder container to blend and grind for 1-3 hours. Specific liquid compound decamethyl cyclopentasiloxane as a disperse medium and the thiourea dioxide are not subjected to chemical reaction; With the environment-friendly paste discharge agent provided by the invention, contact of the thiourea dioxide with the external water and air is isolated; the stability of the thiourea dioxide is improved; the discharge effect is excellent; and the problems of low solubility, poor dispersible uniformity in discharge pulp, poor net permeability and insufficient development of the discharge action caused by common thiourea dioxide used as the discharge agent are overcome.

Description

technical field [0001] The invention relates to a dye discharge agent for textile discharge printing, in particular to an environment-friendly paste dye discharge agent for textile printing and a preparation method thereof. Background technique [0002] The discharge agent is the key chemical agent for the implementation of the discharge printing process. Its role is usually to chemically react with the ground color dye in the printed part during the steaming (treatment under certain humid and hot conditions) after printing (usually Reduction reaction), so that the chromogenic system of the ground color dye is destroyed and achromatic. [0003] At present, the dye discharge agents commonly used in the printing and dyeing industry are solid white block C (sodium formaldehyde sulfoxylate) and Degulin (zinc formaldehyde sulfoxylate), and the whitening agent H (formaldehyde sulfoxylate) synthesized in aqueous solution. Calcium), and the liquid discharge agent Rongalit ST Liq ar...

AI Technical Summary

Problems solved by technology

[0003] At present, the dye discharge agents commonly used in the printing and dyeing industry are solid white block C (sodium formaldehyde sulfoxylate) and Degulin (zinc formaldehyde sulfoxylate), and the whitening agent H (formaldehyde sulfoxylate) synthesized in aqueous solution. Calcium), and the liquid discharge agent Rongalit ST Liq are all formaldehyde sulfoxylate reducing agents, which have the following problems: (1) Release free formaldehyde, so that the printed products cannot meet the requirements of ecological textiles, especially in the discharge printing of pigments In the process, the application of adhesive makes it more difficult to wash off the residual aldehyde dye discharge agent, and the severe water washing also greatly weakens the significance of anhydrous printing of pigment printing; (2) the above-mentioned conventional dye discharge agent is used in It is easy to decompose and lose during the preparation and storage of discharge pulp, resulting in a large amount of discharge agent and high cost; (3) the above-mentioned conventional discharge agents all contain metal ions, even heavy metal ions, while synthetic thickeners used in pigment printing usually They are not resistant to (heavy) metal ions, so that it is difficult to implement the pigment discharge printing process smoothly

However, in actual production practice, there are still some problems with thiourea dioxide as a dye discharge agent for printing: (1) under normal conditions, thiourea dioxide is a white, odorless crystal grain with low solubility (the solubility in 20°C water is only 26.7 grams / liter), while the amount of water used in the preparation of discharge printing paste is very small, resulting in the thiourea dioxide used as a discharge agent in discharge printing cannot be fully dissolved and evenly dispersed in the discharge paste, but in the form of granular crystals Exist in the slurry unevenly, which affects its penetration and the reduction effectiveness of the ground color dye in the printed part; (2) In order to make the discharge agent thiourea dioxide better dissolve and disperse in the discharge slurry, it can be pre- Mechanical milling of thiourea dioxide

However, the dye discharge agent thiourea dioxide after wet grinding absorbs and contacts oxygen in the air (oxygen can be dissolved in water) during storage, which is easy to cause decomposition and has low stability.

The above problems have greatly limited the promotion and application of thiourea dioxide as a dye discharge agent for printing in printing and dyeing enterprises

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