SU10439A1 - Method of dyeing wool - Google Patents

Description

In the practice of dyeing fibrous materials, it has been found to be used under the action of cold on Znafol, its sulphonic acid, which gives dyes with diazo compounds dyes with sulfo group cleavage. Equally, α-naphtha-a-sulfonic acid salts of diazo compounds have been proposed for coloring fibrous substances.

The proposed method for dyeing wool is as follows. Originally prepared from naphthol and sulfuric acid naphthyl-sulfuric acid according to the reaction:

 NZZO; С1оН7О5ОЗН + Н20

In the interaction of naphthyl-sulfuric acid with some aromatic base, such as p-nitraline, and-naphthylamine, -naphthylamine, dianisidine, safranin, etc., a preparation is obtained, in an aqueous solution of which, after adding some acetic sodium salt, is placed wool, pre-washed with 1 ° / about soda, or. Soap, or Petrov contact. The wool is then removed from the bath and placed in a cold solution of nitrate, sodium, and the diazotization reaction takes place. After nitrite

Bath wool is placed in a bath of acetic acid (1 ° / o) - 4 Then the dyed wool is thoroughly washed on a pile with water. The colors of the wool, depending on the reaction, are the following: with p - nitramine - red, with a-naphthylamine-brown, with dianisidine - lilac and with safranin - blue, etc.

The dyeing process is carried out as follows. To 72 weight. 110 weights, parts of sulfuric acid beats are added to the parts of beta-naphthol pounded into powder. at. 1.84. The mixture is ground in a mortar at ordinary temperature (20 ° C). A yellow mass of thick consistency is obtained: it is necessary to abrade carefully so that no grains or beta-naphthol crystals remain. One of the above mentioned bases of the aromatic series is added to the yellow mass, namely: p-nitraniline - 70 weights, parts, a-naphtylamine-72 weight. hours, Dianisidine-61 wt. h., etc. The added base is carefully abraded with a yellow mass of naphthyl-sulfuric acid so that there are no individual unreacted particles. After some time the mixture hardens. The added aromatic base binds an excess of sulfuric acid and partly naphthyl-sulfuric acid. As a result, after thorough mixing, salts are obtained. The prepared preparation is dissolved in water at boiling, added some sodium acetic acid salt to the solution; if necessary, the solution is filtered, after which it is placed in it which has been previously washed either with l / o soda, or with soap, or even better with a solution of Petrov contact, wool. The wool removed from the bath and pressed are placed in a cold solution of sodium nitrite, in which a combination of diazo compounds with beta-naphthyl-sulfuric acid on the fiber occurs during the diazotization reaction; the very solution of nitrite is colored yellow or another color, depending on the base. After lying in a nitrite bath, the wool is squeezed and placed in a bath with acetic acid (solution). The dyed wool is then washed thoroughly on a pile with water. Washing is carried out in 2-3 baths to remove yellowness from the fiber.

The subject of the patent.

A method of dyeing wool using diazo compounds and 2: 1 naphthol sulfonic acid, characterized in that the wool is treated with hot water pacTBOpoiM of a thoroughly ground mixture of the product of the action of sulfuric acid beats. at. 1.84 per d-naphthol at room temperature and any aromatic base capable of diazotization, with addition of sodium acetate, after which the wool is carried out successively on a cold solution of nitrite and on weak acetic acid and washed.