Vacuum freezing dried extraction method of natural plant dye

A natural plant 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, unstable pigment, difficult to achieve reproducibility, etc., to improve dyeing reproducibility sexual effect

Inactive Publication Date: 2009-11-11
DALIAN POLYTECHNIC UNIVERSITY
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  • Application Information

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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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  • Vacuum freezing dried extraction method of natural plant dye
  • Vacuum freezing dried extraction method of natural plant dye
  • Vacuum freezing dried extraction method of natural plant dye

Examples

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Effect test

example 1

[0023] Example 1 Extraction and dyeing of Phellodendron Phellodendron plant dye

[0024] 1. Extraction of Phellodendron Phellodendri Dye:

[0025] 1.1 Put 100 grams of Cork Phellodendron dyeing material into a beaker filled with 1000ml of distilled water, extract at 70°C for 40 minutes, pour out the dye solution, and repeat the extraction twice. The above liquids were collected and mixed and filtered twice, and the filtrate was set aside;

[0026] 1.2 Pre-freezing: put the above-mentioned extracted dye solution on the material tray of 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 material out of the low-temperature refrigerator, quickly install it on the tray rack, and after placing it, cover it with a plexiglass cover, and connect it to the inside of the vacuum state cold trap to start the freeze-drying work. At th...

example 2

[0076] The extraction of example two hematoxylin vegetable dyes

[0077] According to the method of Example 1, the hematoxylin plant dye was extracted: 100g hematoxylin and 550g water were extracted at 60-80°C for 50min, 3 times in total, and the filtrates were combined; -25~-30°C pre-cooled for 5h; Vacuum freeze-drying at 50°C and 18-20Pa for 25 hours to obtain 3g of powdered hematoxylin dye.

[0078] Staining reproducibility experiments. The actual results show that the dyeing reproducibility of the fabric dyed by the hematoxylin powder dye is as high as 100%, while the dyeing reproducibility of the fabric dyed by the traditional method is less than 85%.

example 8

[0079] The extraction of example three gallnut plant dyes

[0080] According to the method of Example 1, gallnut plant dyes were extracted: 100g gallnut plus 1350g water, extracted at 65-70°C for 50min, twice in total, and the filtrates were combined; -35-45°C pre-cooled for 4h; -50--55°C , Under vacuum freeze-drying for 20h at 18-20Pa, 3.5g of powder galla dye was obtained.

[0081] Staining reproducibility experiments were performed. The actual results show that the dyeing reproducibility of the fabric dyed by Galla 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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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 its preparation process, only water is used to make a solution, and then the powder product is extracted by drying. Background technique [0002] Natural plant dyes are non-toxic, ecological, soft in color, natural and distinctive, and they have good environmental compatibility and pharmaceutical health care performance, and have broad development prospects. From the current dyeing process of natural plant dyes, most of the dyes are extracted by heating with water or solvents, and the dye solution is directly used in the dyeing of textiles ([1] Jia Na, Gong Jianpei. Pigment extraction and analysis of yellow series of common plant dyes) Dyeing, Dyeing and Finishing Technology [J], 2006, Volume 28 (3): 24-27; [2] Chinese Invention Patent Publication No.: CN 1204667, A Natural Plant Orthoxanthin for Carpets and Its Preparation and Application Method ). This ...

Claims

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Application Information

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