Synthetic method of weak acidic red dye

A technology of red dye and synthesis method, which is applied in the field of weak acid red dye synthesis, can solve the problems of poor color fastness and large migration of dyed leather, achieve good color fastness, light chroma, and reduce processing costs Effect

Inactive Publication Date: 2014-04-02
JIANGSU BOBOBEAR TEXTILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional leather red dyes are generally azo dyes containing nitro groups. Although the presence of nitro groups is bene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0012] Example 1:

[0013] A method for synthesizing weak acid red dye, using the following steps:

[0014] 1) Diazotization: After mixing p-aminoazobenzene hydrochloride, hydrochloric acid and sodium nitrite, the reaction time is 20 minutes at a temperature of 40°C and 2≤PH≤4;

[0015] 2) Coupling: add soda ash after diazotization of p-aminoazobenzene hydrochloride, hydrochloric acid and sodium nitrite, react for 2 hours under the conditions of 20℃, 8≤PH≤10, add the diazotized diazonium The diazonium salt of aminobenzenesulfonanilide, react for 2 hours at a temperature of 30℃, 8≤PH≤10, add sodium sulfate after the second coupling, at a temperature of 20℃, 8≤PH≤10 , Reaction for 2 hours;

[0016] 3) Filtration: remove the filter residue;

[0017] 4) Drying: drying after filtering to produce finished products.

[0018] The mass ratio of the aminoazobenzene hydrochloride, hydrochloric acid, sodium nitrite to the soda ash and sodium sulfate is 2:3:2:3:5. Example one

Example Embodiment

[0012] Example 1:

Example Embodiment

[0019] Example 2:

[0020] A method for synthesizing weak acid red dye, using the following steps:

[0021] 1) Diazotization: After mixing p-aminoazobenzene hydrochloride, hydrochloric acid and sodium nitrite, the reaction time is 30 minutes at a temperature of 45°C and 2≤PH≤4;

[0022] 2) Coupling: add soda ash after diazotization of p-aminoazobenzene hydrochloride, hydrochloric acid, and sodium nitrite, react for 3 hours at a temperature of 25°C, 8≤PH≤10, and add the diazotized diazonium Diazonium salt of aminobenzenesulfonanilide, react for 3 hours at a temperature of 40℃, 8≤PH≤10, add sodium sulfate after the second coupling, at a temperature of 40℃, 8≤PH≤10 , React for 3 hours;

[0023] 3) Filtration: remove the filter residue;

[0024] 4) Drying: drying after filtering to produce finished products.

[0025] The mass ratio of the aminoazobenzene hydrochloride, hydrochloric acid, sodium nitrite to the soda ash and sodium sulfate is 2:3:2:3:5.

[0026] The advantages of the invention...

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Abstract

The invention discloses a synthetic method of a weak acidic red dye. The synthetic method comprises the following steps: diazotizing, coupling, filtering and drying. The dye has the characteristics of substantivity and low migration property to a certain extent due to a linear structure and larger molecular weight; the weight ratio of aminoazobenzene hydrochloride to hydrochloric acid to sodium nitrite to sodium carbonate to anhydrous sodium sulfate is 2 to 3 to 2 to 3 to 5 in the method; the production method is environment-friendly; the synthesized dye does not contain substances harmful to operating workers in a using process; the dye is good in color fastness, so that dyed wastewater is low in chromaticity during the using process, the treatment expense of the dyed wastewater can be reduced, and a large amount of funds can be saved.

Description

technical field [0001] The invention relates to a method for synthesizing a dye, in particular to a method for synthesizing a weakly acidic red dye. Background technique [0002] At present, the amount of dyes in the red spectrum is increasing year by year in modern leather dyeing, and currently accounts for about 20% of the total leather dyes. In addition to being directly used to dye blue wet leather into red, red leather dyes can also be used to adjust other shades of leather dyes. color or color matching. Traditional leather red dyes are generally azo dyes containing nitro groups. Although the presence of nitro groups is beneficial to leather shade and dyeing fastness, dyed leather has the disadvantages of poor color fastness and large migration. Contents of the invention [0003] The present invention provides a kind of weak acid red dye synthesis method for solving the above-mentioned technical problem of existing leather dyeing method, and the technical scheme of t...

Claims

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Application Information

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IPC IPC(8): C09B43/00
Inventor 温明华温一波吴志芳陈宇豪陈利军陶城
Owner JIANGSU BOBOBEAR TEXTILE
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