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Preparing method of turmeric natural dye

A natural dye, turmeric technology, applied in the preparation and application of natural dyes, can solve the problems of large loss of curcumin, large solvent loss, cumbersome operation process, etc., easy to recycle and reuse, improve extraction rate, and simple preparation process Effect

Inactive Publication Date: 2014-09-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] According to the current prior art literature search, CN103071117A discloses the extraction and separation process of turmeric oil and curcumin by combining ultrasonic strengthening and supercritical carbon dioxide fluid technology. This method not only has a large loss of curcumin, but also has a cumbersome operation process and high equipment costs.
CN103193610A uses alcohol-amino acid water to carry out multistage countercurrent extraction of turmeric, and then purifies it with macroporous resin. Although curcuminoid compound products with higher purity can be obtained, the extraction and refining process needs to use a large amount of organic solvents, and the solvent loss Large amount, easy to cause environmental pollution

Method used

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  • Preparing method of turmeric natural dye

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Effect test

Embodiment 1

[0038] The turmeric root raw material is washed with water, dried, and ground to 60-100 mesh. Mix turmeric powder and petroleum ether according to weight (kg) / volume (L) 1:2, 60W ultrasonic treatment for 20min, wash, filter and dry. Put it in an ultraviolet ray device with a wavelength of 254nm and a power of 12W to irradiate for 2h. Mix the treated turmeric powder with 60% ethanol aqueous extract at a mass ratio of 1:25, stir at 600r / min for 20min, and then perform solid-liquid separation. During the extraction process, combine the extracts. The filtrate was concentrated by distillation under reduced pressure to obtain a dark red paste. Use 30 DEG C of n-propanol to dissolve paste, cool, and precipitate crystals, wherein the mass fraction of curcumin in the crystals is 10%. Preparation concentration is the polyvinylpyrrolidone K-30 aqueous solution of 0.1g / L, in order to dissolve crystal, stirs evenly, promptly makes the turmeric natural dye aqueous solution. Wherein the e...

Embodiment 2

[0041]The turmeric root raw material is washed with water, dried, and ground to 60-100 mesh. Mix turmeric powder and petroleum ether according to weight (kg) / volume (L) 1:6, 150W ultrasonic treatment for 5min, wash, filter and dry. Put it in an ultraviolet ray device with a wavelength of 365nm and a power of 40W for 0.5h. Mix the treated turmeric powder with 90% ethanol aqueous extract at a mass ratio of 1:5, stir at a speed of 200r / min for 60min, and then perform solid-liquid separation. The filter residue is extracted twice under the same conditions, and the extracts are combined. The filtrate was concentrated by distillation under reduced pressure to obtain a dark red paste. Dissolve paste with 60 DEG C of isopropanol, cool, and precipitate crystals, wherein the mass fraction of curcumin in the crystals is 30%. Prepare a Tween-80 aqueous solution with a concentration of 2 g / L to dissolve the crystals and stir evenly to obtain an aqueous solution of turmeric natural dye. ...

Embodiment 3

[0044] The turmeric root raw material is washed with water, dried, and ground to 60-100 mesh. Mix turmeric powder and petroleum ether according to weight (kg) / volume (L) 1:3, 90W ultrasonic treatment for 15min, wash, filter and dry. Put it in an infrared ray device with a wavelength of 715nm and a power of 100W for 2h. Mix the treated turmeric powder with 70% ethanol aqueous extract at a mass ratio of 1:15, stir at a speed of 300r / min for 50min, and then perform solid-liquid separation. Extract the filter residue once under the same conditions, and combine the extracts. The filtrate was concentrated by distillation under reduced pressure to obtain a dark red paste. Dissolve paste with 40 DEG C of propylene glycol, cool, and precipitate crystals, wherein the mass fraction of curcumin in the crystals is 15%. Prepare an aqueous solution of Span-80 with a concentration of 0.5g / L to dissolve crystals and stir evenly to obtain an aqueous solution of turmeric natural dye. The extr...

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Abstract

The invention relates to a preparing method of turmeric natural dye. After petroleum ether mixing, ray radiation pretreatment, stirring and digestion with an extractant, vacuum concentration, recrystallization with polyol, and modification by addition of a surfactant, curcumin in a turmeric raw material is extracted and prepared into the turmeric natural dye. After being blended, the turmeric natural dye can achieve dyeing of fabric in simple and mild conditions. The method is advantageous in that: the dye preparing process is simple, the cost is low, the solvent is cheap and can be easily recovered, and the dye is stable in property and has good dyeing effects for fabric and high sun-proof fasteness.

Description

technical field [0001] The invention relates to the field of preparation and application of natural dyes. Specifically, it refers to a preparation method of turmeric natural dye and its application as a fabric dye. Background technique [0002] In recent years, problems such as synthetic dyes causing some people to suffer from skin diseases and causing serious environmental pollution have been widely reported. Therefore, the natural dyeing products of environmental protection and health have gradually attracted people's widespread attention in recent years. Natural dyes can not only reduce the harm of dyes to the human body, make full use of renewable resources, but also greatly reduce the toxicity of dyeing wastewater, and cause less damage to the ecological environment. As an important class of yellow natural dyes, the extraction and application of turmeric dyes is a hotspot in the field of natural dyes. Extracting curcumin from turmeric and applying it to fabric dyeing ...

Claims

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Application Information

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IPC IPC(8): C09B61/00C09B67/54C07C49/255C07C45/81D06P1/34D06P3/04D06P3/80D06P3/60
Inventor 管国锋刘丹梦万辉王磊
Owner NANJING UNIV OF TECH
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