Trisazo carmoisine and preparation method thereof

An acid dye, trisazo technology, applied in trisazo dyes, dyeing, textiles and papermaking, etc., can solve problems such as unenvironmental protection, and achieve the effects of high dyeing rate, good water solubility and good levelness.

Active Publication Date: 2020-04-21
JINHUA SHUANGHONG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above three kinds of maroon acid dyes are all metal complex dyes, which have excellent color fastness and are wid

Method used

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  • Trisazo carmoisine and preparation method thereof
  • Trisazo carmoisine and preparation method thereof
  • Trisazo carmoisine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of embodiment 1, trisazo red acid dye I-1, carries out the following steps successively:

[0044] 1), in the reactor equipped with a stirring device, start stirring, add 200g of water, add 0.1mol (about 21.23g) of p-diaminoazobenzene, add 0.5mol of hydrochloric acid (hydrochloric acid with a mass fraction of 31%), Add ice and cool to 0-5°C, add dropwise sodium nitrite solution containing 0.205 mol of sodium nitrite (sodium nitrite solution with a mass fraction of 30%), and control the temperature of the reaction system during the dropwise addition to not exceed 5°C. When the starch potassium iodide test paper turns blue, react at 0-5°C for 2 hours (the end point is no color detected by Ehrlich reagent), and then use sulfamic acid to destroy the remaining nitrous acid after the reaction (the starch potassium iodide test paper does not turn blue as the end point). Standard, the amount of sulfamic acid is about 0.5g); get diazonium salt solution (all...

Embodiment 2

[0050] The preparation method of embodiment 2, three azo red acid dyes I-2, carries out the following steps successively:

[0051] 1), with the step 1) of embodiment 1;

[0052] 2) In the reactor equipped with stirring, start the stirring, add 400g of water, add 0.202mol of N-ethyl-N-benzyl m-toluidine-3'-sulfonic acid, add soda ash to adjust the pH=7.0~8.0, Stir until the N-ethyl-N-benzyl-m-toluidine-3'-sulfonic acid dissolves.

[0053]Add ice to cool to 0-5°C, slowly add all the product (diazonium salt solution) obtained in step 1) dropwise, control the temperature of the reaction system not to exceed 10°C during the dropwise addition, and adjust the pH to 7.0 with soda ash during the dropwise addition ~8.0, after adding, react at 5~10℃ for 3 hours, add sodium chloride (about 65g) to precipitate the dye, filter cake with suction, dry the filter cake at 80~90℃ for 24h, and obtain about 116g of dye Ⅰ-2 .

[0054] Dye Ⅰ-2 is:

[0055]

[0056] 1 H NMR (400MHz, DMSO-d6):...

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Abstract

The invention discloses a trisazo carmoisine, and also discloses a preparation method thereof. The preparation method comprises the following steps: diaminoazobenzene, hydrochloric acid and a sodium nitrite solution react in water, and residual nitrous acid is eliminated after the reaction to obtain a diazonium salt solution; and reaction raw materials react with the diazonium salt solution to finally obtain the corresponding trisazo carmoisine, wherein the reaction raw materials are N-ethyl-N-benzyl aniline-3'-sulfonic acid and N-ethyl-N-benzyl m-toluene-3'-sulfonic acid. The trisazo carmoisine disclosed by the invention does not contain carcinogenic dye or heavy metal dye, and belongs to safe and environment-friendly dye. The dye composition has good water solubility, is gentle in dyeingin a dyeing system and good in leveling property, can be efficiently combined with protein and polyamide fibers, is high in dyeing rate, enables dyed fibers to have excellent color fastness, and is an ideal substitute for metal complex dyes.

Description

technical field [0001] The invention belongs to the field of chemical industry; in particular, it relates to a novel red acid dye (trisazo red acid dye) and its preparation method and application. Background technique [0002] Acid dyes refer to dye molecules containing acidic groups, also known as anionic dyes, which can combine with amino groups in protein fibers and polyamide molecules with ionic bonds, and are suitable for acidic, weak acidic or neutral conditions. Acid dyes are the main dyes used in the printing and dyeing of wool and polyamide fibers, accounting for about 95% in my country. They are also widely used in daily chemicals, inks, wood, leather and other fields. They are important dyes with a wide range of applications. [0003] With the improvement of people's living standards, the quality requirements of fabrics are becoming more and more stringent. One of the quality indicators is color fastness. The color fastness of dyed fabrics directly reflects the gr...

Claims

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Application Information

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IPC IPC(8): C09B35/35D06P1/39D06P3/06D06P3/24
CPCC09B35/35D06P1/39D06P3/06D06P3/241
Inventor 章国栋徐建成肖刚
Owner JINHUA SHUANGHONG CHEM CO LTD
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