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Usage of indophenol salt in direct dyeing in situ

A technology of indoxyphenate and potassium indoxylate is applied in indole-indoxyl indigo dyes, dyeing methods, textiles and paper making, etc. The effect of absorption and impregnation ability, saving manpower and material resources, and simplifying the process

Inactive Publication Date: 2005-06-01
北京慧聚英力医药化学技术发展有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, sodium indoxylate is directly used as an intermediate to prepare indigo, but the text does not mention or imply that the indoxyl salt is extracted from the reactant, let alone the purification method of the indoxyl salt

Method used

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  • Usage of indophenol salt in direct dyeing in situ
  • Usage of indophenol salt in direct dyeing in situ
  • Usage of indophenol salt in direct dyeing in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: purification 3-indoxyl salt (3-indoxyl sodium and 3-indoxyl potassium)

[0049] Add 25 grams of 3-indoxyl salt crude product (25%) into a 250 ml Erlenmeyer flask, add 40 ml of deoxygenated water, dissolve it at 90°C, cool to 40°C, crystallize, stir and suction filter to obtain 13.83 gram of filter cake, then dehydrated and dried, and its 3-indoxyl salt (containing crystal water) content was 82% after analysis.

Embodiment 2

[0050] Embodiment 2: purification 3-indoxylate sodium

[0051] Add 25 grams of 3-indoxyl sodium crude product (24%) into a 250 ml Erlenmeyer flask, add 25 ml of deoxygenated water, dissolve it at 100°C, cool to 50°C, crystallize, stir and suction filter to obtain 11.80 gram of filter cake, then dehydrated and dried, and its 3-indoxyl salt (containing crystal water) content was 80% after analysis.

Embodiment 3

[0052] Embodiment 3: purify 3-indoxylate potassium

[0053] Add 25 grams of 3-indoxyl potassium crude product (28%) into a 250 ml Erlenmeyer flask, add 125 ml of deoxygenated water, dissolve it at 80°C, cool to 20°C, crystallize, stir and suction filter to obtain 14.30 gram of filter cake, then dehydrated and dried, and its 3-indoxyl salt (containing crystal water) content was 81% after analysis.

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Abstract

The invention relates to a 3-indoxyl salt that can be oxidized to indigo directly to dye textile materials instead of indigo and indigo white in situ, the preparation method of the indoxyl salt, and the indoxyl salt to be oxidized in situ to form The use of indigo to directly dye textile materials. The invention can simplify the repeated reduction-oxidation process of converting indoxyl salt into indigo in the traditional process into one step. This simplifies the process, saves the alkali and hydrosulfite consumed in multiple reduction-oxidation processes, saves manpower and material resources, thereby improving the utilization rate of equipment, reducing costs, and is conducive to environmental protection and market competition.

Description

(1) Technical field [0001] The invention relates to a 3-indoxyl salt which is oxidized into indigo in situ and directly dyes textile materials, a method for preparing the indoxyl salt, and the indoxyl salt which is oxidized in situ to indigo and directly dyes textile materials. the use of. (2) Background technology [0002] Indigo is a vat dye used for dyeing cellulose-containing textile materials, especially cotton warp yarns of blue denim products. [0003] At present, indigo is mostly prepared through the oxidation of 3-indoxylate (see JP-B-2024817, DE-A-2643877). Including the reaction at 220-250°C by the mixed alkali of anilinoacetic acid salt, sodium amide, sodium hydroxide and potassium hydroxide to obtain a melt containing 24-30% 3-indoxyl salt (hereinafter referred to as alkali Melt), the alkali melt is put into a large amount of water (4-6 times), oxidized by air, and then filtered, washed (including acid wash, alkali wash, water wash), dried, and granulated to o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B7/08D06P1/00
Inventor 尹应武田金平唐波郑祥斌张立塔樊福平毛卫平冯倩罗小风任鹰张正西
Owner 北京慧聚英力医药化学技术发展有限公司
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