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A kind of environmentally friendly disazo acid red dye and preparation method thereof

A bisazo and acid red technology, applied in the field of fabric organic dyes, can solve the problems of difficult coloring, low dyeing improvement rate, dark dyeing color, etc., to achieve convenient production control, simple preparation process, and high yield of product dyes Effect

Active Publication Date: 2020-12-08
宁波现代精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, the industry is looking for alternative dyes. However, there are still flaws in the use process and effect of the substitute dyes. Compared with the original dyes that are currently banned, there are still some defects in the dyeing effect, such as darker dyeing color, lower dyeing improvement rate, and higher dyeing effect. Due to the problem of color difficulty, there is a need for an acid red dye that is environmentally friendly and has a dyeing performance comparable to that of the original dye

Method used

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  • A kind of environmentally friendly disazo acid red dye and preparation method thereof
  • A kind of environmentally friendly disazo acid red dye and preparation method thereof
  • A kind of environmentally friendly disazo acid red dye and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0074] A kind of environmentally friendly disazo acid red dye, it has the chemical structure of general formula (I), wherein R 1 for hydrogen, R 2 for hydrogen, R 3 for hydrogen, R 4 for hydrogen.

[0075] The preparation method steps of the disazo acid red dye of embodiment one are as follows,

[0076] T1: Take 150ml of deionized water, add 17.2g of 4,4-diaminobiphenyl-2,2-disulfonic acid, heat up to 60°C, then add 30wt% liquid caustic soda solution (sodium hydroxide solution), stir well Finally, add 3.55g sodium nitrite for subsequent use, and make a part of the pre-prepared solution;

[0077] T1: Take 100ml of ice-water mixture, add 10g of hydrochloric acid, start the stirrer to mix the mixture, cool down to 0-5°C, then maintain the temperature at 0-5°C, then add a portion of the pre-prepared solution into the beaker, pre-prepared The time for adding the solution is 5 minutes. After the addition, the temperature of the mixed liquid is kept at 5-8°C, and the reaction is...

Embodiment 2

[0084] A kind of environmentally friendly disazo acid red dye has the chemical structure of general formula (I), wherein R 1 is methyl, R 2 is methyl, R 3 for hydrogen, R 4 for hydrogen.

[0085] The disazo acid red dye preparation method step of embodiment two is based on the basis of embodiment one, and its difference is that in T1, 5,5-dimethylbenzidine-2,2-disulfonic acid Substituting 4,4-diaminobiphenyl-2,2-disulfonic acid for synthesis to prepare the product disazo acid red dye (P2).

[0086]

Embodiment 3

[0088] A kind of environmentally friendly disazo acid red dye has the chemical structure of general formula (I), wherein R 1 is methoxy, R 2 is methoxy, R 3 for hydrogen, R 4 for hydrogen.

[0089] The steps of the preparation method of disazo acid red dye in Example 3 are based on the basis of Example 1. The difference is that in T1, 5,5-dimethoxybenzidine-2,2-bis Sulfonic acid replaces 4,4-diaminobiphenyl-2,2-disulfonic acid to synthesize the product bis-azo acid red dye (P3).

[0090]

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Abstract

The invention relates to the field of fabric organic dyes and discloses an environment-friendly disazo acid red dye. The dye has a chemical structure shown as a general formula (I), wherein R1 and R2are independently selected from one of hydrogen, C1-C5 alkyl, C1-C5 alkoxy and a chlorine group, R3 is independently selected from one of hydrogen, a sulfonic acid group and a carboxyl group, and R4 is independently selected from one of hydrogen, methyl, methoxy, ethoxy, nitro and a chlorine group. The dyeing color and luster of a dyed fabric are strong and rich, and the dyeing promotion rate of the dye is increased.

Description

technical field [0001] The invention relates to the field of fabric organic dyes, in particular to an environmentally friendly disazo acid red dye and a preparation method thereof. Background technique [0002] Azo dyes are the most widely used synthetic dyes in the printing and dyeing process of textiles and clothing. They are used for dyeing and printing of various natural and synthetic fibers, and are also used for coloring of paints, plastics, rubber, etc. [0003] Acid dyes are a kind of water-soluble dyes with acidic groups in their structure, and they are dyed in acidic medium. It is mainly used for dyeing wool, silk and nylon, and can also be used for leather, paper, ink, etc. Azo acid red dyes belong to azo dyes and acid dyes. With the current awareness of environmental protection and people's increasing health requirements, a large number of azo dyes and the use of their raw materials in the field of dyes are banned in the existing Chinese standards and foreign st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B35/037C09B35/20
CPCC09B35/037C09B35/20
Inventor 吴宗哲马干田
Owner 宁波现代精细化工有限公司
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