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Environment-friendly reactive red disazo dye and preparation method thereof

A disazo dye, environmentally friendly technology, used in azo dyes, reactive dyes, organic dyes, etc., can solve the problems of harsh synthesis process, affecting large-scale use, etc., to protect the environment, improve color fixing rate and dyeing. deep effect

Inactive Publication Date: 2015-04-01
吴江桃源染料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many reports on red azo dyes in existing patents. For example, the Chinese invention patent with application number 201010175509.1 discloses a disazo reactive dye, which can form purple, red and red dyes according to different synthetic materials. , navy blue and other colors; however, it is not difficult to find in the patent specification that its synthesis process is relatively strict, requiring the use of conditions such as high pressure, nitrogen or hydrogen protection, and 90-100°C, which seriously affects the possibility of its large-scale use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method of above-mentioned environment-friendly active red disazo dye comprises the following steps:

[0035] (a) will Add it into water to dissolve, keep the temperature at 0~5°C, add the hydrochloric acid solution and then add the sodium nitrite solution to react for 1~3 hours to obtain the first mixed solution. , The molar ratio of the hydrochloric acid to the sodium nitrite is 1:0.5~0.7:1~1.1; (b) adding and anionic surfactant, stirred and reacted at 5~10°C for 2~3 hours to obtain the second mixed solution, the with the said The molar ratio is 1:0.96~0.98, the anionic surfactant and the The ratio is 0.5~1g / mol; (c) will Add it into water to dissolve, keep the temperature at 0~5°C, add the hydrochloric acid solution and then add the sodium nitrite solution to react for 1~3 hours to obtain the third mixed solution. . The molar ratio of the sodium nitrite to the hydrochloric acid is 0.90~0.95:0.90~0.95:1; (d) adding the third mixed solution ...

Embodiment 1

[0039]This embodiment provides an environment-friendly reactive red disazo dye whose chemical structural formula is as follows:

[0040] ;

[0041] The preparation method of above-mentioned environment-friendly reactive red disazo dye is as follows:

[0042] (a) will Add in water to dissolve, add ice cubes to make the water temperature 0°C, add hydrochloric acid solution, add sodium nitrite solution and react for 1 hour to obtain the first mixed solution, 1. The mol ratio of hydrochloric acid and sodium nitrite is 1:0.5:1, and the addition method of hydrochloric acid and sodium nitrite is dropwise addition, and the addition speed is 0.5kg / hour; Control the pH value of the solution to make the Congo red test paper show blue, starch Potassium iodide test paper is microscopically blue, when the color of starch potassium iodide test paper deepens, add a certain amount of ; If the starch potassium iodide test paper is colorless, add a certain amount of sodium nitrite soluti...

Embodiment 2

[0048] The present embodiment provides a kind of environment-friendly active red disazo dye consistent with that in Example 1, except that its reaction temperature, reaction time and materials are relatively inconsistent, as follows:

[0049] (a) will Add it into water to dissolve, keep the water temperature at 5°C, add hydrochloric acid solution, then add sodium nitrite solution to react for 3 hours to obtain the first mixed solution, 1. The mol ratio of hydrochloric acid and sodium nitrite is 1:0.7:1.1, and the adding method of hydrochloric acid and sodium nitrite is dripping, and the adding speed is 2.5kg / hour; Potassium iodide test paper is microscopically blue, when the color of starch potassium iodide test paper deepens, add a certain amount of ; If the starch potassium iodide test paper is colorless, add a certain amount of sodium nitrite solution (the amount of added material here is determined according to the color change of the test paper), and place it at 8°C f...

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PUM

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Abstract

The invention relates to an environment-friendly reactive red disazo dye and a preparation method thereof. The chemical structure general formula is disclosed as Formula (I), wherein X is selected from Na, K or Li; R1 is -H, -CH3(CH2)n-1, -CH3(CH2)n-1O, -COOH or -SO3H; R2 is -CH3(CH2)n-1O; R3 is -(CH2)n-; and n is a whole number, and 1<=n<=4. The disazo dye contains hydroxy, amino and sulfo groups, and thus, is weakly alkaline, thereby being beneficial to lowering the strict preparation conditions and further beneficial to the subsequent dyeing technique. The functional groups are combined with the disazo group to enhance the fixation rate and deep dyeing property.

Description

technical field [0001] The invention belongs to the field of organic dyes and relates to a disazo dye, in particular to an environment-friendly reactive red disazo dye and a preparation method thereof. Background technique [0002] Reactive dyes, also known as reactive dyes, are a class of dyes that chemically react with fibers during dyeing. Such dye molecules contain groups that can chemically react with fibers. When dyeing, the dyes react with the fibers and form covalent bonds between them to form a whole, which improves the fastness to washing and rubbing. [0003] There are many reports on red azo dyes in existing patents. For example, the Chinese invention patent with application number 201010175509.1 discloses a disazo reactive dye, which can form purple, red and red dyes according to different synthetic materials. , navy blue and other colors; however, it is not difficult to find in the patent specification that its synthesis process is relatively strict, requirin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B62/513C07C317/34C07C315/04
Inventor 陆再宏薛伟陆海英
Owner 吴江桃源染料有限公司
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