Preparation method of salvia miltiorrhiza bunge vegetable dye and method for dyeing cotton fabrics using salvia miltiorrhiza bunge vegetable dye
A plant dye and cotton fabric dyeing technology is applied in the field of preparation of natural plant dyes of Salvia miltiorrhiza. Soft and natural color effect
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[0025] The preparation method of the present invention generally comprises the following steps:
[0026] (1) Extraction: Put the root of Salvia miltiorrhiza in a solvent, the solvent is any kind of alcohol, ketone and ester solvent, or a mixed solvent composed of these solvents, and use heating and reflux, cold soaking, hot soaking, percolation, ultrasonic extraction, etc. Extraction, microwave extraction. A preferred extraction method: take the root of Salvia miltiorrhiza and put it in 60-90% ethanol whose mass is 5-12 times that of the root of Salvia miltiorrhiza, and extract it under reflux for 2-3 times, each time for 1-2 hours.
[0027] (2) Crude product preparation: the extract was filtered and concentrated under reduced pressure to obtain a liquid extract to obtain the crude product I. Crude product I was dissolved and suspended in water, filtered to obtain a filter cake, and the filter cake was dried under reduced pressure to obtain crude product II. The crude produc...
Embodiment 1
[0035] Embodiment 1: the preparation method of salvia miltiorrhiza plant dye is as follows:
[0036] Take 1 kg of Danshen root slices, add 8 liters of 85% ethanol, soak at room temperature for 5 hours, then reflux for 2 hours, filter the extract; put the residue in 5 liters of 85% ethanol, reflux for 2 hours, and filter the extract. The two extracts were combined, concentrated under reduced pressure to obtain a liquid extract, and the crude product I was obtained, until the ethanol in the crude product I volatilized and no longer had the smell of ethanol. Add 200 milliliters of water to the crude product I, stir and filter, put the filter cake in a vacuum drying oven at 40°C and dry under reduced pressure, and then pulverize after drying to obtain the natural vegetable dye of Danshen.
Embodiment 2
[0037] Embodiment 2: the preparation method of salvia miltiorrhiza plant dye is as follows:
[0038]After pulverizing the root of Salvia miltiorrhiza that passes No. 4 sieve, get 1 kilogram and pack in the percolation bucket, add 20 liters of 90% ethanol and carry out percolation. The percolation liquid is filtered and then concentrated under reduced pressure to obtain a liquid extract to obtain the crude product I, until the ethanol in the crude product I volatilizes and no longer has the smell of ethanol. Add 1000 milliliters of water and 1000 milliliters of chloroform (trichloromethane) to the crude product I for extraction, extract three times in total, combine the chloroform extracts, concentrate to dryness under reduced pressure, and dry the paste in a vacuum oven at 40°C to dry under reduced pressure. Dried and crushed to obtain Danshen natural plant dye with high color level.
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