Method for extracting and dyeing reddish-brown natural dye of oil-tea camellia shells

A technology of natural dyes and Camellia oleifera husks, which is applied in the extraction and dyeing of reddish-brown natural dyes, can solve the problems that the pigment components have not been effectively developed, the extraction of camellia oleifera fruit pigments and the stability research, etc., and achieve short preparation cycle and relative Good capacity and simple extraction process

Inactive Publication Date: 2011-08-17
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]Wash the camellia oleifera husk with warm water at 30°C, after natural air drying, weigh 100 grams, grind it mechanically to 30 mesh, add sodium carbonate aqueous solution for leaching, the pH of the aqueous solution is 8, extract at a temperature of 40°C for 2 hours, the ratio of solid to liquid 1:5, and then filtered to obtain filtrate and filter residue containing natural dyes. The above-mentioned method was used to extract the filter residue several times, and the number of extractions was 2 times. Concentrate the extract under reduced pressure, evaporate 60% of the water therein, then adjust the pH value of the extract to 2 with 5wt% hydrochloric acid aqueous solution after concentration, add ethanol to remove the pectin impurities in the concentrate, and adjust the pH value of the ethanol. Volume fraction to 60%. Finally, after filtering the pectin impurities, adjust the pH value of the filtrate to 8 with 20wt% sodium hydroxide lye, stir evenly and let it stand fo...

Embodiment 2

[0036] Wash the camellia oleifera husk with warm water at 40°C, weigh 100 grams after natural air-drying, grind it mechanically to 50 mesh, add sodium carbonate aqueous solution for leaching, the pH of the aqueous solution is 9, extract at a temperature of 50°C for 3 hours, the ratio of solid to liquid The ratio is 1:10, and then filtered to obtain the filtrate and filter residue containing natural dyes. The above-mentioned method was used to extract the filter residue several times, and the number of extractions was 3 times. Concentrate the extract under reduced pressure, evaporate 70% of the water therein, then adjust the pH value of the concentrated extract to 3 with 7wt% hydrochloric acid aqueous solution, add ethanol to remove the pectin impurities in the concentrate, and adjust the volume of ethanol Score up to 70%. Finally, after filtering the pectin impurities, adjust the pH value of the filtrate to 10 with 25wt% sodium hydroxide lye, stir evenly and let stand for 5 h...

Embodiment 3

[0041] Wash the camellia oleifera husk with warm water at 50°C, after natural air drying, weigh 100 grams, grind it mechanically to 60 mesh, add sodium carbonate aqueous solution for leaching, the pH of the aqueous solution is 10, extract at a temperature of 60°C for 4 hours, the ratio of solid to liquid The ratio is 1:15, and then filtered to obtain the filtrate and filter residue containing natural dyes. The above method was used to extract the filter residue several times, and the number of extractions was 4 times. Concentrate the extract under reduced pressure, evaporate 75% of the water therein, then adjust the pH value 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 evenly and let stand for 6 hours to extract the supe...

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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 an extraction and dyeing method of a reddish-brown natural dye, in particular to a method for extraction and dyeing of a reddish-brown natural dye from camellia oleifera husk. technical background [0002] Natural pigments are safe and non-toxic, and are especially popular among people. Today, when the world advocates health, returning to nature and advocating environmental protection, the disadvantages of synthetic dyes such as harm to the human body and pollution to the environment have attracted more and more attention. However, natural dyes from Chinese herbal medicines are extracted from living organisms and have good environmental protection. Compatibility and biodegradability. Moreover, modern studies have shown that during the dyeing process of natural Chinese herbal medicine dyes, their medicinal active ingredients, aromatic ingredients and natural pigments are absorbed by the fabric together, so that the dyed fabric ...

Claims

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Application Information

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Patent Type & Authority Applications(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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