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Preparation method of red direct blending dye

A direct and red technology, applied in the direction of organic dyes, azo dyes, chemical instruments and methods, etc., can solve the problems of complex components, difficult to handle, low strength, etc., and achieve superior dyeing performance, clean production promotion, and less environmental pollution Effect

Pending Publication Date: 2022-05-27
ZHEJIANG RUNTU DYE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dye wastewater synthesized by this method has a lot of complex components and is difficult to handle, which brings great inconvenience to the use of downstream printing and dyeing manufacturers; at the same time, the mixed diazo has no selectivity in the reaction, so that the intensity obtained after the subsequent coupling reaction lower

Method used

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  • Preparation method of red direct blending dye
  • Preparation method of red direct blending dye
  • Preparation method of red direct blending dye

Examples

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preparation example Construction

[0033] The invention provides a preparation method of a red direct blended dye, which comprises the following steps:

[0034] The step of obtaining scarlet acid: making the salt solution of J salt react with bis(trichloromethyl) carbonate to obtain scarlet acid reaction product, and obtain clear scarlet acid in the scarlet acid reaction product;

[0035] The step of obtaining diazonium salt A: making aniline carry out diazotization reaction to obtain diazonium salt A;

[0036] The step of obtaining diazonium salt B: making p-aminoacetanilide carry out diazotization reaction to obtain diazonium salt B;

[0037] Coupling reaction step: make clear scarlet acid and diazonium salt A and diazonium salt B carry out coupling reaction to obtain coupling product;

[0038] Post-processing step: after post-processing the coupling product, a red direct blended dye is obtained.

[0039] The red direct blended dye of the present invention has high strength and excellent dyeing performance,...

Embodiment 1

[0080] Step (1): add 600 g of bottom water to the three-necked flask, then add 85 g of J acid, start stirring, stir for 1 hour and then heat up to 45 ° C, adjust the pH to 7 with liquid caustic soda and dissolve it for later use. Add 23 g of bis(trichloromethyl) carbonate to the dissolved J salt solution, while keeping the temperature of the system at 45 °C, adjust the pH to 7 with baking soda, react for 3 hours and then raise the temperature to 55 °C to keep the pH The reaction was performed at a pH of 7 for 15 hours, then the temperature was raised to 60° C., and the reaction was maintained at a pH of 7 for 3 hours to reach the end point to obtain a scarlet acid reaction product. The scarlet acid reaction product was adjusted to pH 8 with liquid caustic soda and dissolved, then 20 g of baking soda was added, stirred for 30 min, and then closed for stirring and sedimentation. Reserve after reaching 15°C.

[0081]Step (2): Dissolve 11.5g of sodium nitrite in 35g of water, sti...

Embodiment 2

[0086] Step (1): add 600 g of bottom water to the three-necked flask and then add 85 g of J acid, turn on stirring, stir for 1 hour and then heat up to 40 ° C, adjust the pH to 6.5 with liquid caustic soda and dissolve it for later use. Add 23 g of bis(trichloromethyl) carbonate to the dissolved J acid solution, while keeping the temperature of the system at 45 °C, adjust the pH value to 5 with baking soda, react for 3 hours and then heat up to 55 °C to maintain the pH value The reaction is carried out for 5 hours for 15 hours, then the temperature is raised to 60° C., the pH value is maintained at 5, and the reaction reaches the end point after 3 hours to obtain the scarlet acid reaction product. The scarlet acid reaction product was adjusted to pH 8 with liquid caustic soda and dissolved, then 20 g of baking soda was added, stirred for 30 min, and then closed for stirring and sedimentation. Reserve after reaching 15°C.

[0087] Step (2): Dissolve 11.5g of sodium nitrite in ...

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Abstract

The invention provides a preparation method of a red direct blending dye. The method comprises the following steps: a step of obtaining the scarlet acid: enabling a J acid salt solution to react with bis (trichloromethyl) carbonate to obtain a scarlet acid reaction product, and obtaining the dissolved scarlet acid in the scarlet acid reaction product; the method comprises the following steps: obtaining diazonium salt A: carrying out diazotization reaction on aniline to obtain the diazonium salt A; a step of obtaining diazonium salt B: carrying out diazotization reaction on p-aminoacetanilide to obtain the diazonium salt B; coupling reaction: carrying out coupling reaction on the dissolved scarlet acid, the diazonium salt A and the diazonium salt B to obtain a coupling product; and a post-treatment step: carrying out post-treatment on the coupling product to obtain the red direct blending dye. The red direct blending dye is high in strength and excellent in dyeing performance, almost no waste water is generated in the preparation process, environmental pollution is smaller, and the red direct blending dye has a great promotion effect on clean production.

Description

technical field [0001] The invention relates to a preparation method of a red direct blended dye, in particular to a preparation method of a direct acid-resistant scarlet 4BS, and belongs to the field of dye synthesis. Background technique [0002] Direct acid fast red 4BS, also known as direct red 23, direct red B, direct acid fast jujube red, etc., is a disazo direct dye with good affinity and excellent acid resistance. The dye is used in a large amount and has a wide application prospect. [0003] Direct acid-fast scarlet 4BS dye is a purple-red powder, which is soluble in water and turns bright red, slightly soluble in ethanol, orange, and insoluble in acetone. It is bright red to magenta in concentrated sulfuric acid, and turns brownish orange after dilution; it has orange-yellow precipitate in concentrated nitric acid; it is insoluble in concentrated caustic soda; it is bright red in concentrated ammonia water. The aqueous solution of direct acid-resistant scarlet 4B...

Claims

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Application Information

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IPC IPC(8): C09B33/056
CPCC09B33/056
Inventor 陈锋侯洪明李茂顾春妹夏凡
Owner ZHEJIANG RUNTU DYE
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