Polyester and cotton flame retardant fabric printing process

FONT>The former has a high color fixation rate, the color fastness can be increased by 0.5 to 1 level, and the production is easy to control; the key technology of high-temperature and rapid evaporation of alkali rolling in two-phase printing is proposedis the equipment, and the process conditions of two soapings are given to solve the problem of white floor contamination.

The disperse/reactive whole-material printing process is to add alkali, urea and other additives together with disperse and reactive dyes into the paste for printing, and then Baking under alkaline conditions – steaming and color fixing – washing and soaping; the two-phase printing process is to print disperse/reactive dyes under weakly acidic conditionsFlower, then baked to fix the color. Rolled with alkali and quickly evaporated at high temperature. Wash and soap. The biggest feature of the latter is that it can greatly improve the color fixation rate of disperse/reactive dyes. At the same time, it can effectively solve the problem of disperse/reactive full-material printing by optimizing disperse dyes. It is easy to cause the problem of staining the white floor. Since the color pastedoes not contain alkali agents, the color paste has good stability and can be placed for 2
d or above; the production is easy to control, the pulping operation is simple; and a large amount of urea is saved, which is beneficial to the environment.
1.Principle analysis

As we all know, disperse dyes can only be fully fixed under weakly acidic conditions. If the coloring rate is low under weakly alkaline conditions, baking soda willmake it Some disperse dyes decompose, which affects the color light and reduces the dye uptake rate; the two-phase printing method can improve the color fixation rate of disperse dyes.

Urea can form a co-solvent with disperse dyes, causing disperse dyes to diffuse into cotton fibers, causing serious staining; the two-phase method is used for printing, which is in its prescription No urea is added to reduce staining during soaping.

The fixation reaction between reactive dyes and cellulose fibers is carried out under alkaline conditions. pH value, steaming temperature and humidity will directly affect its reaction speed. Under strong alkaline conditions, fiber ionization is greatly enhanced and fiber ion concentration is greatly increased. When the pH value is 9, the ion concentration of cellulose fiber is 3 times; 10^-4mol/kg; when the pH value is At 13 o’clock, the ion concentration of cellulose fiber increases

1.1 mol/kg. pH value

For every 1 increase, the fiber ion concentration increases 10 times; for every 10°C increase in temperature, the reaction speed increases 2 to 3 times. Using German Goller’s high-temperature rapid steaming machine, the flame-retardant fabric is rolled with alkali agent and then enters the steaming box. The moisture content on the fabric reaches more than 40%, giving activity The water medium is provided for dye fixation, so the reactive dyes can be fixed at high temperature (130~140℃), high humidity, and in a short time (40~60℃).
s) conditionsfully solidify the color.

2. Sample test

2.1 Screening of dyes

In order to prevent the problem of white ground contamination after printing, we chose high-temperature disperse dyes and remazolin reactive dyes that are not resistant to alkali, so that they can be used under weakly acidic conditions down to fully fix the disperse dye. The hot alkali washing process is used in post-processing to destroy the floating color of disperse dyes and prevent contamination.

2.2 Relationship between disperse dye fixation rate and pH value

Three dyes, dispersed red CBN-SF, dispersed lake blue XF, and dispersed yellow brown XF, were used to conduct experiments, and their color fixation rates K/Svalue.

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