SU10423A1 - The method of obtaining azo dyes - Google Patents

Description

German Patent No. 256999 and A number of others describe dyes obtained by combining non-sulfonated diazo compounds with arylides of 2.3-hydroxy naphthoic acid and can serve to form durable varnishes and valuable colors on fibrous substances.

In the proposed method, any diazo compounds are combined with 2.3-hydroxy naphthoic acid o-alkyloxyarylides, or their derivatives, for further substitution in the aryl residue. The dyes obtained by this method, being generally benign, have considerable durability to light.

Example 1. Diazo-solution prepared in a known manner from 16, 2 parts of 2.5-dichloroaniline is poured, with rapid stirring, into aqueous suspension 30, .7 parts of o-anisidide 2.3 - hydroxynaphthoic acid obtained by dissolving it in a dilute caustic soda solution and subsequent separation of the diluted acetic acid. The dye is isolated in the form of red colored flakes; it is filtered off at the end of the combination, washed until neutral, and consumed as a paste; mixed with conventional substrates, it forms a durable to light varnish. Instead of o-anisidide of 2.3-hydroxynaphthoic acid, o-phenetidide can also be used.

Example 2- Formation of dyes on the fiber. Primer solution: 10 g of o-anisidide hydroxy naphthoic acid are well mixed with 20 kg / b. with caustic soda solution 34 ° Be and 20 cu. with alizarin oil, dissolve, pouring 200 cu. from hot WATER and put t per liter. The cotton material impregnated with this solution is well pressed and then appears in a dye solution made as follows: 3 g of 4-chloro-1.2-toluidine are diazotized in the usual way, the solution is diluted with cold WATER to a liter, neutralized with sodium acetate and added There are 50 table salt. The finished paint, as usual, is washed in a well and warm water, then washed on a bale, washed again and dried. Recipe for printing: the fabric is impregnated with a solution of 12 g of 2.3-hydroxy-naphthoyl-4-chloro. 2-anisidide in l, dried and then coated with the ink indicated below. 300 "4-chloro-1,2-toluidine is diazotized in the usual way, and the diazo solution is set at 10 liters.

Printing ink: 4,500 cc. from a lizar solution, 4.000 i tragantic and thickeners 1:20, 1.000 cu. with sulfur-1 acid alumina 1: 1, 500 cubic meters. with i

Diao compound from

3-HAOranilina

2-chloraniline

2.5-dichloroaniline 4-chloro-1.2-toluidine

5-chloro-1.2-toluidine 6-chloro-1.2-toluidine

4-chloro-1.3-toluidine 4-chloro-1.2-anisin dina 5-nitro-1.2-anisidine

4-nitro-1.2-anisidine

4-nitro-1.2-toluidine

5-nitro-1.2-toluidine

Z-nitro-1.4-toluidine

4-chloro-2-nitro-aniline

Z-nitro-1.4-toluidine

acetic acid 1: 1. After printing, the fabric is dried at 40-50, washed with warm, slightly alkaline soap solution, and washed with hot water.

The following table shows the shades of some new dyes, or lacquers derived from them:

Tint dye or

Combined with

derived from it

varnishes:

o-anisidide

2.3-hydroxy naphthoic

Orange

acids

yellow red

also

Shoimeo PI with yellowish

  GUGT TTILCD

shade

too (Example 2)

red

red with bluish

also tinged

red

red with a yellowish tint

red with a bluish tint

burgundy

red

red with yellowish

also tinged

burgundy

burgundy

t o i

burgundy

o-fenetididom

red

2.3-hydroxy naphthoic

acids

Subject Pate n t.

A method of producing azo dyes in a substance or on fibers, characterized in that any diazo compounds are combined with alkoxy-arylides of 2: 3-hydroxy naphthoic acid. in solution or on fiber.