Vacuum freezing dried extraction method of natural plant dye

A natural vegetable dye, vacuum freeze-drying technology, applied in the direction of natural dyes, azo dyes, organic dyes, etc., can solve the problems of unquantifiable pigment content, difficult to achieve reproducibility, unstable pigment, etc., to improve dyeing reproduction sexual effect

Inactive Publication Date: 2007-09-19
DALIAN POLYTECHNIC UNIVERSITY
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AI Technical Summary

Problems solved by technology

Furthermore, due to the instability of some pigments in natural plant dyes, obvious color differences may also appear when repeated experiments are carried out under different experimental conditions. In practical applications, it is basically necessary to re-extract and filter every time, resulting in The pigment content cannot be quantified each time, and the reproducibility is even more difficult to achieve
[0003] At present, there is a lack of mature methods for extracting natural plant dyes and natural plant dye products with stable quality and excellent performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: Extraction and dyeing of plant dyes from Phellodendron amurense

[0024] 1. Extraction of Phellodendron chinense plant dye:

[0025] 1.1 Put 100g of Phellodendron chinense dyeing material into a beaker containing 1000ml of distilled water, extract at 70°C for 40 minutes, pour out the dye solution, and repeat the extraction twice. Collect, mix and filter the above liquid twice, and the filtrate is ready for use;

[0026] 1.2 Pre-freezing: Put the above-mentioned extracted dye solution on the material tray of the DTY-1SL small freeze dryer (Beijing Detianyou Technology Development Co., Ltd.), and then put it in a low-temperature refrigerator at -40°C for 3 hours;

[0027] 1.3 Vacuum freeze-drying: Take the pre-frozen materials out of the low-temperature refrigerator, quickly install them on the tray rack, put them on the plexiglass cover, and connect the vacuum cold trap to start the freeze-drying work. At this time, the vacuum degree is 20 Pa, the cold trap temper...

example 2

[0067] Example 2 Extraction of Hematoxylin Vegetable Dyes

[0068] According to the method of Example 1, the hematoxylin plant dyes were extracted: 100g hematoxylin plus 550g water, 60~80℃ extraction for 50min, 3 times, filtrates combined; -25~-30℃ precooling for 5h; -45~- Vacuum freeze-drying was carried out at 50°C and 18-20 Pa for 25h to obtain 3g powdered hematoxylin dye.

[0069] Dyeing reproducibility experiment. The actual results show that the dyeing reproducibility of fabrics dyed by hematoxylin powder dye is as high as 100%, while the dyeing reproducibility of fabrics dyed by traditional methods is less than 85%.

example 8

[0070] Example Three: Extraction of Vegetable Dyes from Galla

[0071] According to the method of Example 1, the plant dyes of Galla Chinensis were extracted: 100g of Gallnuts plus 1350g of water, 65~70℃ for 50min, a total of 2 times, the filtrates were combined; -35~-45℃ for 4h; -50~-55℃ , Carry out 20h vacuum freeze-drying under 18-20Pa to obtain 3.5g powdered gallic dye.

[0072] A dyeing reproducibility experiment was performed. The actual results show that the dyeing reproducibility of the fabric dyed by the gallic powder dye is as high as 100%, while the dyeing reproducibility of the fabric dyed by the traditional method is less than 85%.

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PUM

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Abstract

The invention provides a method of extracting natural plant dye, which uses dye-containing plant as raw material to obtain pulverulent natural plant dye by water extraction, vacuum cooling and drying. The method includes steps: (1) abstraction: weight ratio of water and plant of 1:5-15, extraction temperature of 40-90 DEG C, extraction time of 20-60 min, extraction frequency of 1-3, combining extraction liquid; (2) precooling: temperature of minus 20 - minus 50 DEG C, time of 1-5 h; (3) vacuum freeze drying: temperature of minus 45 - minus 55DEG C, vacuum degree of 10-20Pa, time of 15-20 h. Outstanding character of the invention is: 1. preparing pulverulent product and not destructing original biochemical property of natural plant dye; 2. solving problem of bad staining reproducibility of natural plant dye liquid extracted by existent technique and increasing staining reproducibility of the natural plant dye liquid; 3. solving problem of conservation of the natural plant dye liquid and capable of storing the natural plant dye liquid for a long time.

Description

Technical field [0001] The present invention relates to dyes of natural origin prepared from natural raw materials. In the preparation process, only water is used to make a solution, and then the powdery product is extracted by a drying method. Background technique [0002] Natural plant dyes are non-toxic, ecological, soft in color, natural and distinctive, and they have good environmental compatibility and medicine health care properties, and have broad development prospects. Judging from the current dyeing process of natural plant dyes, most of the dyes are extracted by heating with water or solvent, and the dye liquor is directly used for dyeing of textiles ([1] Jia Na, Gong Jianpei. The extraction and extraction of yellow pigments from common plant dyes Dyeing, dyeing and finishing technology [J], 2006, Volume 28 (3): 24-27; [2] Chinese Invention Patent Publication Number: CN 1204667, a natural plant yellow pigment for carpets and its preparation and use methods ). This meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
Inventor 崔永珠
Owner DALIAN POLYTECHNIC UNIVERSITY
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