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Method for extracting matural dye from external skin of walnut

A technology of walnut rind and natural dyes, applied in the field of natural dyes, can solve the problems of complex tannin pigment composition and cannot be directly used as dyes, etc., and achieve the effect of fast dyeing effect

Inactive Publication Date: 2007-02-14
青岛海联植物科技研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the current extraction of tannin pigment components is complex and cannot be directly used as dyes and replace harmful chemical components in plant dyes, a method for extracting natural reactive dyes (black, brown-red) from walnut exocarp is invented.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 2 kg of cut walnut exocarp (blue), wash it, put it in a tank, add 500ml of water to ferment for 48 hours, dry it to get carbon black-like raw materials, put it into a large bottle for extraction (do not use a metal container), add The 70% ethanol aqueous solution of 16 liters of raw material weight needs leaching 3-4 times, until the black becomes lighter.

[0024] After the above extract is filtered, concentrated under reduced pressure and centrifuged, the mother liquor is placed in an adsorption resin column equipped with a macroporous resin for column layer adsorption, so that the dyed matter of the walnut exocarp is gathered, and the water-soluble impurities that are not adsorbed Wash off with water, then elute with water, and then elute with 40-70% ethanol, black and reddish-brown dyes flow out. The eluted effluents were respectively concentrated under reduced pressure (ethanol recovery), and the concentrate was diluted with water and then extracted with dieth...

Embodiment 2

[0030] Take 2 kg of cut walnut exocarp (blue), wash it, put it in a tank, add 500ml of water to ferment for 48 hours, dry it to get carbon black-like raw materials, put it into a large bottle for extraction (do not use a metal container), add The 50% ethanol aqueous solution of 16 liters of raw material weight needs leaching 3-4 times, until the black becomes lighter.

[0031] After the above extract is filtered, concentrated under reduced pressure and centrifuged, the mother liquor is placed in an adsorption resin column equipped with a macroporous resin for column layer adsorption, so that the dyed matter of the walnut exocarp is gathered, and the water-soluble impurities that are not adsorbed Wash off with water, then elute with water, and then elute with 40-70% ethanol, black and reddish-brown dyes flow out. The eluted effluents were respectively concentrated under reduced pressure (ethanol recovery), and the concentrate was diluted with water and then extracted with dieth...

Embodiment 3

[0036] Take 2 kg of chopped walnut exocarp (blue), wash it, put it in a tank, add 500ml of water to ferment for 48 hours, dry it to get carbon black-like raw materials, put it into a large bottle for extraction (do not use a metal container), add The 30% ethanol aqueous solution of 16 liters of raw material weights needs leaching 3-4 times, until the black becomes lighter.

[0037] After the above extract is filtered, concentrated under reduced pressure and centrifuged, the mother liquor is placed in an adsorption resin column equipped with a macroporous resin for column layer adsorption, so that the dyed matter of the walnut exocarp is gathered, and the water-soluble impurities that are not adsorbed Wash off with water, then elute with water, and then elute with 40-70% ethanol, black and reddish-brown dyes flow out. The eluted effluents were respectively concentrated under reduced pressure (ethanol recovery), and the concentrate was diluted with water and then extracted with ...

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Abstract

The method of extracting natural dye from walnut epicarp is to extract natural active dye from walnut epicarp containing condensated tannin component in 27-30 % possessing dyeing activity in the molecular weight range of 350-2000. By means of fermenting, drying, organic solvent extracting, adsorbing, refining and other technological steps, carbon black and reddish brown dyes of purity over 90 % are prepared. The obtained dyes have fast dyeing effect and high fastness and may be used as permanent pure botanic dyes. The obtained dyes are used in dyeing hair, wool, fabric, etc.

Description

technical field [0001] The invention relates to the field of natural dyes, in particular to a technology for the extraction and dyeing performance of natural plant dyes. Background technique [0002] The current extraction process is mainly brown pigment dye extracted from the walnut exocarp. It is the total composition of tannins obtained by direct water or organic solvent extraction. The composition is complex, and the molecular weight range is too large or too small , The dyeing effect is poor and the dyeing is not firm. In order to overcome these shortcomings, the vegetable tannin dye products used are all added with phenylenediamine and toxic heavy metal carcinogenic compounds. These substances are very harmful to the human body. Contents of the invention [0003] In order to solve the problem that the extraction of tannin pigment components is complex and cannot be directly used as dyes and replace harmful chemical components in plant dyes, the present invention inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 阿依别克.马力克
Owner 青岛海联植物科技研究所
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