SU1183585A1 - Method of dyeing textile material of cotton, polyamide and their blends - Google Patents

Abstract

METHOD FOR DYEING TEXTILE MATERIAL FROM COTTON, POLYAMIDE IPI FROM THEIR MIXTURE by impregnating it in a dye bath based on active or vat dye at pH 11.1-11.4 for cotton and pH 4-5.5 for polyamide or pH 6-7 for a mixture of fibers followed by neutralization and washing, characterized in that, in order to increase the choice of the dye and the degree of its fixation on the material, as well as to simplify the technological process, a negative electrode for cotton or a mixture of it with polyamide or positive for a polyamide is supplied to the dyebath A constant voltage of 20–50 V and attached to a tank containing a 20% solution of inorganic salt through a cation-exchange or anion-exchange membrane, respectively, the voltage is removed when reaching the bath indicated (Above the pH of the solution, dyeing the wire t at 20-25 ° C, and neutralization by changing the polarity of the electrodes.

Description

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The invention relates to the dyeing industry, the finishing industry, in particular to the methods of dyeing textile material made of cotton, polyamide S1I, and their mixture with one class of dyes - active cubic dyes. The purpose of the invention is to increase the selectability of the dye and the degree of its fixation on the material, as well as to simplify the technological process. The drawing shows a device for carrying out the method. The device contains a dye bath 1 filled with water, which, through membrane 2, communicates with tank 3 in a 20% solution of inorganic salt. Tank 3 is connected tacl; e through the second -1membrane 4 with a bathtub 5 filled with water. An electrode G is introduced into the cavity of the dye bath 1, and an electrode 7 is introduced into the cavity of the bath 5 and the electrodes B and 7 are connected to a constant voltage source (not shown). To dye cotton textile material or mix it with polyamide, electrode b in bath 1 is connected to the negative pole of the source of constant voltage, and membrane 2 is chosen anion-exchange. To dye the polyamide textile material in the bath 5, the electrode 7 is connected to the positive pole, and the membrane 4 is chosen as cation exchange. The fabric being dyed is separated from electrodes b and 7 by a polymeric mesh 8. Example 1. A tank 3 is filled with a 20% solution of sodium chloride, including a source of constant voltage of 20 V at a current of 1.4-1.6 A. Through 10–15 mip after incorporation, upon reaching a 5 pI of 4-5.5 in the dyebath, dissolve the procytile red dye in it and dip the fabric of the brush by dipping into the solution. Dyeing is carried out at 20-25 ° C. After a pH of 4-5.5 is reached, the voltage source can be turned off, including as the pH changes until it reaches the required one. At the same time in the dye bath 1 at 20-25 ° C, a voltage of 20 V and a current of 1.4-1.6 And after 10 minutes, the pH of the solution is set to 11.1-11.4. In this bath, the dye yellow P is dissolved and when the voltage source is disconnected, cotton fabric is immersed there. The dyeing of fabrics in both baths 1 and 5 takes place within 30 minutes. Then the source is switched on in another polarity and the neutralization of solutions in both baths is carried out simultaneously, gradually moving to the second stage of dyeing, when the pH in dyebath 5 reaches 10-11, and in the other bath 1-4-5. The neutralization process takes 25–30 minutes at a current of 1.4–1.6 A and a voltage of 20–30 V. Example 2. A 20% aqueous solution of sodium sulphate is poured into tank 3 and includes a constant voltage source of 20 V at current 1.1-1, FOR, When reaching the dye bath 5 pH 6-7, put the dye cubozol golden yellow LC in the amount of 1.8-2.2% by weight of the fiber, Bath module - 50, maintaining constant Current and voltage are dyeing the fabric from a mixture of cotton and polyamide for 60 minutes, after which the polarity of the electrodes is switched, and after 15-20 minutes after that, at a current of 2-3 and a voltage of 40 V is carried out about the oxidative coloring phenomenon, adjusted to pH 3-4, and allowed to stand at 20-25 ° C for 30 min. Thus, the simplification of the technological process is achieved. The selectability and degree of fixation of the dye on the material are presented in the table.

А1СТивньый ойщ айловый red, polyamide Aktivpye M-protsionovy yellow P, cotton Kubozol golden-yellow ZhSH, mixed fabric: cotton, 45%, polyamide - 55%

59

67 93

84

79

74

311835854

As can be seen from the table, when using 1.05–1.1 times, while fixing it with the proposed method of selecting a dye — 1.08–1.17, the intensity of the dye is multiplied.

Claims (1)

METHOD FOR DYING TEXTILE MATERIAL FROM COTTON, POLYAMIDE OR FROM THEIR MIXTURE by impregnating it in a dyeing bath based on active or vat dye at pH 11.1-11.4 for cotton and pH 4-5.5 for polyamide or pH 6-7 for a mixture of fibers, followed by neutralization and washing, characterized in that, in order to increase the selectivity of the dye and its fixation on the material, as well as simplify the process, a negative electrode for cotton or a mixture of it with polyamide or a positive electrode for polyamide with pic at a constant voltage of 20-50 V and connect it to a tank containing a 20% solution of inorganic salt through a cation exchange or anion exchange membrane, respectively, the voltage is removed when the above pH solution is reached in the bath, dyeing is carried out at 20-25 ° C, and neutralization by changing the polarity of the electrodes. (L s / 2 l -f 700 00 SL 00 SL X__ 7 — SZZZZZ ^ ZZ ^ $ i 4