Method for preparing acid black 172

A technology of acid black and sulfonic acid, applied in chemical instruments and methods, dyeing methods, compound metal compounds of azo dyes, etc., can solve the problem of product abrasion resistance, low washing and light fastness, and low concentration of only 8- 10%, long product production cycle and other problems, to achieve the effect of speeding up the chromization reaction, increasing the product yield and reducing the cost of treatment
CN101538414BInactive Publication Date: 2012-07-04TIANJIN SANHUAN CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN SANHUAN CHEM
Publication Date
2012-07-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing acid black 172. The method comprises the following steps that: (1) 6-nitro-1 and 2-diazoxynaphthalene-4-sulfonic acid are put into a dissolution tank, added with water for dissolution, added with a sodium hydroxide solution and stirred. (2) 2-naphthol is put into the dissolution tank, added with water for dissolution, added with the sodium hydroxide solution, stirred, heated, added with a dispersant and aliphatic diol or ether and stirred again; (3) a prepared 2-naphthol solution is rapidly put into and coupled with a solution with 6-nitro-1 and2-diazoxynaphthalene-4-sulfonic acid so as to obtain coupled liquid; and (4) the coupled liquid is added with formic acid, ammonium bicarbonate or sodium bicarbonate and basic chromium sulfate, heated to be between 100 and 102 DEG C, thermally insulated and stirred so as to obtain an acid black 172 serous finished product. The method for preparing acid black 172 has the advantages of simple production process, scientific reasonable control on reaction conditions, short production cycle of produces, high yield, good quality, friction resistance, obviously raised fastness of resisting rinse and sunshine, obviously reduced side reaction and impurities, low production cost, high production efficiency and better environment-friendly property.
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Description

Technical field

[0001] The invention belongs to the field of metal complex azo dyes, in particular to a preparation method of acid black 172. Background technique

[0002] Acid Black 172 is an acid dye named according to the international dye number. Its trade name is Neutral Black S-RL. It has higher dye fastness to wool and polyamide fibers, and the price is lower. It is widely used, and the demand in the market is increasing year by year. It is estimated that the demand in the world this year will reach 30,000 tons. The main reactions in the production of Acid Black 172 are as follows:

[0003] 1.6-Nitro-1,2-diazooxynaphthalene-4-sulfonic acid dissolution:

[0004]

[0005] 2.2-Naphthol dissolution:

[0006]

[0007] 3. Coupling reaction:

[0008]

[0009] 4. Chromization reaction:

[0010]

[0011] The production method of the above reaction is mainly to put 6-nitro-1,2-diazooxynaphthalene-4-sulfonic acid into a dissolution tank, dissolve it with 30% liquid caustic soda, and put t...

Claims

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