SU41611A1 - The method of obtaining blue cotton substantive trisazocrasitel - Google Patents

Description

According to the present invention, a method for producing a cotton blue cotton substantive for cotton is presented according to the following scheme.

Para-nitroaniline is diazotized and combined with Kleve acid (1 naphthylamine, 7 sulfonic acid), then the nitro group is reduced with sodium sulphide to an amino group. The dye is diazotized and combined with a monoazoxylate obtained by reduction of the product of the combination with sulfurous sodium in an acidic medium, diazoparanitroaniline and I-acid. The nitro group is reduced to the amino group in the resulting triazone.

When dyeing them with a fabric, the dye can be diazotized onto the fabric and developed with p-naphtol.

Example. When heated, 6.9 g of paranitroaniline are dissolved in 13 cu. I eat hydrochloric acid 18 ° Be with the addition of 75 cubic meters. see water Upon cooling, 3.5 g of nitrite are diazotized at a temperature of about 0 °.

The diazoparanitroaniline obtained is slowly poured onto a cooled solution of 11.15 g 1.7 Kleve acid, ne (186)

Stir for 2 hours at a temperature not higher than 5 ° C and add water until slightly alkaline. The next day, the resulting dye is reduced with sulfur dioxide at a temperature of 56 ° to convert the nitro group to an amino group. The result is a dye of the following structure.

NH,

) N N

./ /

80 Na

(first basis).

In parallel, diazoparanitroaniline is prepared as described above, which is slowly poured onto a cooled soda solution of 11.95 g of I-acid. After two hours of transfer at 5 ° C, soda is added until neutral. The resulting dye is also treated with sodium sulphide to convert the nitro group to an amino group. Wherein

dye is obtained, the mule:

N N

NH, / f

SOoNa

NK

(second basis).

Next, the first base paste is subjected to diazotization of 5.5 z of nitrite at a temperature not higher than 5 °. The resulting diazo compound is slowly added to the second base solution, left for 4 hours with stirring; temperature not higher than 7 °. After 18-20 hours, heat to 60 ° and the resulting dye is salted out. The yield of dry dye 50 g

Formula:

NH,

  ,

The subject matter of the invention.

A method for producing a cotton trisazo dye, cotton, which is substantive for cotton, characterized in that the amino dye obtained by combining para-nitrodiazo benzene with 1 naphthylamine 7-sulfonic acid, followed by

/

K3 Na.

by the formation of a nitro group by sodium sulphide, it is diazotized and combined in an alkaline medium with a monoazo dye obtained by reducing the nitro group of the acid combination product of p-nitrodiazo benzene with 2-amino-5-naphthol-7-sulfonic acid (I-acid) with sodium sulphide.