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Raman spectrum discriminating method of natural dyeing silk fabrics

A natural indigo and Raman spectroscopy technology, applied in the field of chemical dye identification, can solve the problems of single identification method, low identification degree, fabric damage, etc., and achieve the effect of enhancing the intensity of incident excitation light, easy operation and reducing loss

Active Publication Date: 2015-12-09
ZHEJIANG SCI-TECH UNIV
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AI Technical Summary

Problems solved by technology

At present, the identification methods published in the literature include the following two types: first, the identification research of natural indigo-dyed cotton fabrics and synthetic indigo-dyed cotton fabrics is carried out by using thin-layer chromatography and oxidation method. damage, and the degree of identification is not high
Second, only using near-infrared spectroscopy to identify natural indigo-dyed cotton fabrics and synthetic indigo-dyed cotton fabrics, there is a single identification method

Method used

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  • Raman spectrum discriminating method of natural dyeing silk fabrics
  • Raman spectrum discriminating method of natural dyeing silk fabrics
  • Raman spectrum discriminating method of natural dyeing silk fabrics

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Experimental program
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Embodiment

[0038] (1) Indigo dyeing: use vat dyeing method to make natural indigo dye dye silk fabric, the dyeing process and formula are as follows:

[0039] Table 1 Natural indigo dyed silk fabric process and formula

[0040]

[0041] (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 1.2g / l, Na 2 CO 2 0.6g / l, add natural indigo dye into the dyeing cup, and add water and mix thoroughly; then first add 2 / 3 Na to the dyeing cup 2 S 2 o 4 , 2 / 3 Na 2 CO 2 and 1 / 3 of water, the initial temperature in the dyeing cup is 20°C, then gradually increase the temperature to 50°C, the heating rate is 5°C / min, and dry the vat for 10 minutes at 50°C; then add the remaining 1 / 3Na 2 CO 2 , 1 / 3Na 2 S 2 o 4 and 2 / 3 of water, and dry the tank at 50°C for 30 minutes to obtain a transparent yellow-green dyeing bath.

[0042] (b) Oxidation: take 2.0g of silk fabric and dip-dye it completely into the dye bath, fully oxid...

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Abstract

The invention discloses a Raman spectrum discriminating method of natural dyeing silk fabrics, and comprises the following steps: (1) indigo dyeing: a natural indigo dye is adopted to dye silk fabrics with a reduction dyeing method, and a sample 1, a sample 2, and a sample 3 are obtained; (2) a copper coin substrate is prepared; (3) UV aging: the sample 2 and sample 3 are placed in a UV aging test machine for aging for a period of time; and (4) Raman spectrum test: the substrate is placed on a Fourier infrared Raman spectrometer, then the sample 1, sample 2, sample 3 are placed in batches in the Fourier infrared Raman spectrometer to acquire Raman spectrums. In the invention, non-invasive Raman spectrum technology is adopted for performing characterization test for natural indigo dyed silk fabrics and synthetic indigo dyed silk fabrics, and achieves the goal for quickly discriminating the fabrics, and has a significance in food development, fabric dyeing and discrimination and maintenance for ancient textiles.

Description

technical field [0001] The invention relates to the field of identification of chemical dyes, in particular to a Raman spectrum 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 synthetic dye indigo. Compared with other natural dyes, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 余志成刘文凤应乐
Owner ZHEJIANG SCI-TECH UNIV
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