SU15245A1 - The method of obtaining azo dyes - Google Patents

Description

It was found by the researchers that new and especially valuable products are obtained in the series of dyes produced by the 2.3 oxidophenoic acid and of the hydroxyls of the 2.3 oxynaphthoic acid, if the diazo compounds of the amines having substituents in the 2 and 5 positions to the amino group, of which at least one is halogen, are combined with p-naphthalide 2. 3 - hydroxynaphthoic acid. New dyes, when mixed with conventional substrates, form valuable lacquers, and when they are formed on the fiber, they give a coloration that, along with purity of tint and strength, is even more resistant to scouring.

Suitable bases are, for example, the following: 4 - chlorine -1.2 - toluidine, 4 - chlorine -1.3 - toluidine, 4-chloro .2 - anisidine, 4 - chlorine -1.3 - anisidine and the corresponding phenetidines, 2.5dichloroaniline, 4 - chlorine - 2 - aminodiphenyl ether, etc.

Example 1. 14.5 parts of 4-chloro .2- toluidine are dissolved in dilute hydrochloric acid, cooled to -} - 5 ° C, by adding 7 parts of sodium nitrite dissolved in 30 parts of water, diazotized and combined with a solution of 31, 3 parts of p-naphthalide of 2.3 oxynaphthoic acid in diluted caustic soda (40 parts of caustic soda 36 Vu in 500 parts of water), to which the required amount of acetic acid was added to bind excess mineral acid from the diazotization. At the end of the combination, the precipitate is filtered off. After drying, the dye has the appearance of a glossy red powder, dissolved in co-centered sulfuric acid with a red-violet color; when adding water, it falls in the form of red flakes. For the preparation of dye lacquers, it is mixed, best of all in the form of a paste, with the substrates commonly used for the manufacture of lacquers, and the red lacquers with a high tint of blue are obtained.

Example 2. Well boiled and dried yarn is impregnated with a solution of 3 g of P-naphthalide 2. 3-hydroxynaphthoic acid, 9 cu. cm of sodium hydroxide solution 34 ° Be and 8 cu. see alizarin oil; then it is well pressed and without a slit is treated with a diazo-solution, which is neutralized by means of chalk, containing 2,9 g of diazotized 4-chloro-1 in 1 liter of solution. 2 Toluidine or 4, 4 "4-chloro-2-aminodiphenyl ether, after which it is washed and washed. Both amines give a clean red color that is very resistant to learning. New dyes can also be obtained by any of the usual methods of work in sittsepravleniya.

Similarly, the proposed method can be carried out with other corresponding halogen-substituted amines.

The subject of the patent.

A method of producing azo dyes in a substance or on fibers, characterized in that the diazo compounds from aromatic amines having substituents in 2 and 5 places relative to the amino group, of which at least one is halogen, are combined with 8 naphthalide 2 .3 hydroxynaphthoic acid .