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Extraction and dyeing method of natural red-brown dyestuff from camellia oleifera husk

A technology for natural dyes and camellia husks is applied in the field of extraction and dyeing of red-brown natural dyes. The effect of mild conditions and simple extraction process

Inactive Publication Date: 2015-08-12
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Camellia oleifera husk has high comprehensive utilization value. Due to the high content of lignin and pentosan in oleifera oleifera husk, the research on the utilization of camellia oleifera husk is still focused on furfural, activated carbon, tea saponin and xylose. In the preparation of alcohol, the pigment components contained in camellia oleifera shell have not been effectively developed
At present, there is no report on the extraction and stability of camellia oleifera pigment in detail

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Use 30℃ warm water to clean the husk of camellia oleifera, after natural air drying, weigh 100 grams, mechanically crush it to 30 mesh, add sodium carbonate aqueous solution for extraction, the pH of the aqueous solution is 8, and extract at 40℃ for 2 hours. It is 1:5, and then filtered to obtain filtrate and filter residue containing natural dye. The filter residue was extracted multiple times by the above method, and the extraction times were 2 times. Concentrate the extract under reduced pressure, evaporate 60% of the water, and adjust the pH of the concentrated extract to 2 with a 5wt% aqueous hydrochloric acid solution. Add ethanol to remove the pectin impurities in the concentrate and adjust the ethanol The volume fraction is up to 60%. Finally, after filtering the pectin impurities, adjust the pH value of the filtrate to 8 with 20wt% sodium hydroxide lye, stir and let stand for 4 hours, then extract the supernatant, and put the extracted supernatant into the vacu...

Embodiment 2

[0036] Use 40℃ warm water to clean the husk of camellia oleifera, after natural air drying, weigh 100 grams, mechanically crush it to 50 mesh, add sodium carbonate aqueous solution for extraction, the pH of the aqueous solution is 9, and extract at 50℃ for 3 hours. It is 1:10, and then filtered to obtain filtrate and filter residue containing natural dye. The filter residue was extracted multiple times by the above method, and the extraction times were 3 times. Concentrate the extract under reduced pressure, evaporate 70% of the water, adjust the pH of the concentrated extract to 3 with a 7wt% aqueous hydrochloric acid solution, add ethanol to remove the pectin impurities in the concentrate, and adjust the volume of ethanol Score to 70%. Finally, after filtering the pectin impurities, adjust the pH value of the filtrate to 10 with 25wt% sodium hydroxide lye, stir and let stand for 5 hours, then extract the supernatant, and put the extracted supernatant into a vacuum concentrat...

Embodiment 3

[0041] Use 50℃ warm water to clean the husk of camellia oleifera, after natural air drying, weigh 100 grams, mechanically crush to 60 mesh, add sodium carbonate aqueous solution for extraction, the pH of the aqueous solution is 10, and extract at 60℃ for 4 hours. The ratio is 1:15, and then filtered to obtain filtrate and filter residue containing natural dyes. The filter residue is extracted multiple times by the above method, and the extraction times are 4 times. Concentrate the extract under reduced pressure, evaporate 75% of the water, then adjust the pH of the concentrated extract to 5 with a 10wt% aqueous solution, add ethanol to remove the pectin impurities in the concentrate, and adjust the volume fraction of ethanol To 85%. Finally, after filtering the pectin impurities, adjust the pH value of the filtrate to 9 with 28wt% sodium hydroxide lye, stir and let stand for 6 hours, then extract the supernatant, and put the extracted supernatant into a vacuum concentration ta...

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Abstract

The invention discloses a method for extracting and dyeing reddish-brown natural dye of oil-tea camellia shells. After cleaned and air-dried, the oil-tea camellia shell is smashed and leached with taking sodium carbonate aqueous solution as solvent. Filtered filter residues are repeatedly leached with the sodium carbonate aqueous solution. Filtrate is combined to obtain natural dye concentrate of the oil-tea camellia shell by pressure reduction, distillation and concentration. The obtained concentrate is subjected to pectin removal, filtration, pressure reduction, distillation, concentration, spray and drying to obtain the powder natural dye of the oil-tea camellia shell. Pretreated pure cotton fabric can be dyed with the natural dye of the oil-tea camellia shell to obtain fabric which is uniform in gloss. The method for extracting and dyeing the natural dye of the oil-tea camellia shell is safe and environment-friendly by taking the oil-tea camellia shell as a raw material so as to effectively utilize natural waste. The fabric dyed by the method can be made into clothing that is safe, free of carcinogenic and deforming action or causing skin sensibility, good in compatibility with ecological environment and available for biodegradation.

Description

Technical field [0001] The invention relates to a red-brown natural dye extraction and dyeing method, and more specifically to a red-brown natural dye extraction and dyeing method from camellia oleifera husk. technical background [0002] Natural pigments are safe and non-toxic, and are especially popular with people. In today's global advocating of health, returning to nature and advocating environmental protection, the disadvantages of synthetic dyes such as harm to the human body and environmental pollution have attracted more and more attention, while the natural dyes of Chinese herbal medicine are extracted from organisms and have a good environment. Compatibility and biodegradability. Moreover, modern studies have shown that during the dyeing process of Chinese herbal natural dyes, its medicinal active ingredients, aromatic components and natural pigments are absorbed by the fabric together, so that the dyed fabric has special medical health functions, such as antibacteria...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B61/00D06P3/60D06P1/34
Inventor 纪俊玲徐成耀李小琴汪媛何叶丽张培坤
Owner CHANGZHOU UNIV
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