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Discriminating method of natural indigo dyed silk fabric

A natural indigo and silk technology, applied in the field of chemical identification, can solve the problems of low identification degree and large fabric damage, and achieve the effect of high identification success rate, easy to use, and rapid identification

Active Publication Date: 2015-12-02
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the identification methods published in the literature mainly include thin layer chromatography, oxidation method, etc., but these methods are relatively damaging to the fabric, and the identification degree is not high

Method used

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  • Discriminating method of natural indigo dyed silk fabric
  • Discriminating method of natural indigo dyed silk fabric
  • Discriminating method of natural indigo dyed silk fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] (1) Indigo dyeing: first get natural indigo dye and silk fabric, adopt vat dyeing method, dyeing process and formula are as follows table 1:

[0035] Table 1 Natural indigo dyed silk fabric process and formula

[0036]

[0037] (a) Reduction: First determine the bath ratio as 1:50, then accurately weigh 5% (o.w.f) of natural indigo dye, Na 2 S 2 o 4 0.8g / l, NaOH 0.6g / l, add natural indigo dye into the dyeing cup, and add a small amount of water to mix thoroughly; then add 2 / 3 of NaOH to the dyeing cup 2 S 2 o 4 , 2 / 3 of NaOH and 1 / 3 of water, the amount of dyeing bath is 1 / 3 at this time;, control the initial temperature in the dyeing cup to 40°C, then gradually increase the temperature to 50°C, and dry the vat at 50°C Reduction for 10min; then add remaining 1 / 3NaOH, 1 / 3Na 2 S 2 o 4 and 2 / 3 of water, and dry the tank at 50°C for 20 minutes to obtain a transparent yellow-green dyeing bath.

[0038] (b) Oxidation: take 2.0g of silk fabric and dip-dye it comple...

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Abstract

The invention discloses a discriminating method of a natural indigo dyed silk fabric. The method comprises the following steps: 1, dyeing a silk fabric by adopting a natural indigo dye to obtain the natural indigo dyed silk fabric; 2, extracting the extract liquid of the natural indigo dyed silk fabric; and 3, carrying out fluorescence test on the extract liquid obtained in step 2. Characterization test of the extract liquid of the natural indigo dyed silk fabric is carried out, so the purpose of rapid discrimination of the natural indigo dye and a synthesized indigo dye is achieved according to characteristic emission peaks of the extraction liquid in a three dimensional fluorescence spectrogram. The method has the advantages of simple operation, good practical use effect, and great significance to food exploitation, fabric dyeing, and discrimination and maintenance of ancient textiles.

Description

technical field [0001] The invention relates to the field of chemical identification, in particular to an identification method for natural indigo-dyed silk fabrics. Background technique [0002] Natural indigo dye is mainly obtained from bluegrass plants through the fermentation of distiller's grains and slaked lime. It is distributed in indole-containing plants such as Polygonum indigo, Isatis indigo, Indigo indigo, and horse indigo. It mainly contains two pigments, indigo and indirubin. Indigo is synthesized by condensing aniline and chloroacetic acid into ferric N-phenylglycinate in the presence of ferric sulfate, then adding potassium hydroxide to transform the mother liquor, and then carrying out alkali fusion with sodium amide and mixed alkali to generate 3-indoxyl, which is then purified by air Oxidation, filtration, crushing, drying and commercialization to obtain the finished product of commercial dye indigo. Compared with other natural dyes, there are not many pi...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N1/30
Inventor 余志成刘文凤
Owner ZHEJIANG SCI-TECH UNIV
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