Composition of printing pastes with the hottest ne

2022-07-30
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Composition of printing pastes with neutral dyes and direct dyes the composition of printing pastes with weak acid dyes, neutral dyes and direct dyes used for silk knitted fabrics is not complex, and mainly consists of dyes, urea, ammonium sulfate, raw paste, etc

the selection of dyes should be based on the color brightness and color fastness reaching the standard, and the solubility and color giving amount of dyes should also be considered, and the dyes with similar blood lines should be selected for color matching. When using, pay attention to the maximum dosage of various dyes in the color paste, so as to ensure the wet treatment fastness of knitted fabrics and prevent white ground contamination and color fading

urea is a hygroscopic agent and cosolvent, which plays the role of hygroscopic, solubilizing and swelling. When dissolving dyes, if necessary, the cosolvent gulixin a can be added to help dissolve the insoluble dyes

ammonium sulfate is an acid releasing agent, which can adjust the pH value of printing paste. During the steaming process, the acid agent will be released, which will promote the dye to dye to the fiber

the printing of silk knitted fabrics requires clear outline, even block surface, bright color and white ground. To achieve the above requirements, the choice of printing paste has important practical significance. The compatibility between the paste and the dye must be good, with certain adhesion, good scraping and printing, good permeability control system, permeability and easy washing. The etherified seed gum paste is preferred. At present, in the actual production of printing enterprises, the source of starch paste is rich and the price is low. There is no

directly related to the dyeing depth and the maximum amount of dye. When weak acid dyes are used for nylon dyeing, hydrogen bonds and van der Waals force play an important role in the ionic bonding between dyes and fibers. The production practice has proved that the weak acid dyes used in nylon dyeing are not limited by the dyeing saturation value, so the weak acid dyes must be used in the dyeing and finishing of nylon products

it also makes the sample slip in the process of the experiment. Neutral dyes are dyes that are 2:1 complexed by dye molecules and metal chromium (or cobalt) and are suitable for dyeing 2. The basic performance colors of Jinan gold assay fixture in neutral or weak acid dyeing baths. They are collectively referred to as neutral complex dyes. Domestic products are called neutral dyes for short. One of the main advantages of this dye is that it does not need to be treated with chrome medium after dyeing

The dyeing process of neutral dyes is very similar to that of weak acid dyes. Metal complex ions with negative charge can generate charge gravitation with ionized amino groups on the fiber. The pH value of the dyeing bath directly affects the dyeing rate. In order to avoid uneven dyeing caused by too fast dyeing, the pH value of the dyeing bath is controlled at neutral or near neutral, and the pH value can be adjusted to 6 ~ 7 with ammonium salt. Then, with the decomposition of ammonium salt, the acidity is enhanced to promote the dyeing of fibers. In addition, hydrogen bond and van der Waals force also play a good role in dyeing with neutral dyes

direct dyes are mainly used when color matching chromatography is insufficient to make up for color matching needs

considering the adaptability of the above dyes to fibers, dye depth, color fastness, operation feasibility, complete color matching chromatograms and other factors, weak acid dyes are mainly used for the printing of silk knitted fabrics and nylon knitted fabrics even if the above factors are taken into account. Medium dyes and direct dyes with high dye uptake to the above fibers can be used to meet the needs of color matching and color matching

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