Usage of indophenol salt in direct dyeing in situ

A technology of indoxyl salt and potassium indoxyl, which is applied in the directions of indole-indigo dyes, dyeing methods, textiles and papermaking, etc., can solve the problems such as the purification method of indoxyl salt that are not mentioned, and achieve improvement Effects of absorption and impregnation ability, shortening of dyeing time, and cost reduction

Inactive Publication Date: 2004-05-26
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

AI Technical Summary

Problems solved by technology

In this method, sodium indoxylate is directly used as an intermediate to prepare indigo, but the text does not men...

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

An application of 3-indolol salt instead of indigo and indigo white in direct in-situ dyeing of fabric and the process for preparing said 3-indolol salt are disclosed. Its advantages are simplified process and high utilization rate of equipment.

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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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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