CN104693833A

CN104693833A - Preparation method of onion skin vegetable dye

Info

Publication number: CN104693833A
Application number: CN201510140693.9A
Authority: CN
Inventors: 姚红亮
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-03-30
Filing date: 2015-03-30
Publication date: 2015-06-10

Abstract

The invention provides a preparation method of an onion skin vegetable dye. The preparation method of the onion skin vegetable dye comprises the steps that firstly, onion skin is selected, cleaned and dried, and then the onion skin is crushed into plant powder of 30-80 meshes through a medicinal herb grinder; secondly, the plant powder is placed into an extraction pot, absolute ethyl alcohol is added into the extraction pot, the plant powder and the absolute ethyl alcohol are stirred for three hours to extract natural dye liquor, the proportion between the onion skin and the absolute ethyl alcohol is 1 to 10-20, and a dye liquid is obtained after filtering and slag removal are conducted; thirdly, the dye liquid is heated to reach 65-70 DEG C, the dye liquid is concentrated and the dye concentrated liquid with the concentration being 40%-50% is obtained; fourthly, reduction vaporization is conducted on the dye concentrated liquid through a rotary evaporator, and the dye concentrated liquid is volatilized and dried into natural dye powder. Raw materials of the onion skin vegetable dye are conveniently obtained, and the production process is simple. The prepared powder dye is convenient to transport, store and produce and high in production efficiency.

Description

A kind of preparation method of onion-skin vegetable dye

[technical field]

The present invention relates to chemical dyestuff technical field, be specifically related to a kind of preparation method of onion-skin vegetable dye.

[background technology]

Along with the raising of people's living standard, quality of life and living environment are more and more paid attention to, the biological degradation of natural plant dye self energy, do not affect environment, vegetable dye originating species, can expand plantation, continuous production, and it is applied to textile dyeing, there is significant Social benefit and economic benefit.Onion-skin contains pigment, is a kind of well Pure natural dye.

[summary of the invention]

The invention provides a kind of preparation method of onion-skin vegetable dye, make its technique simple, production efficiency is high, easily extracts the natural plant dye with dyeing function.

The technical scheme that the preparation method of a kind of onion-skin of the present invention vegetable dye adopts is: a kind of preparation method of onion-skin vegetable dye, comprise the following steps: step 1: choose onion-skin, clean, dry, then be ground into 30-80 object plant powder with medicinal herb grinder; Step 2: plant powder is placed in extractor, adds dehydrated alcohol, and stir and extract natural dye liquor in 3 hours, onion-skin is 1: 10-20 with the ratio of dehydrated alcohol, namely obtains dye solution after filter and remove residue; Step 3: dye solution is heated to 65-70 DEG C, is concentrated into the dye concentrated solution that concentration is 40%-50%; Step 4: by dye concentrated solution through Rotary Evaporators reduction vaporization, volatile dry makes natural dye powder.

Further, Rotary Evaporators is dry: vacuum tightness 0.085 MPa, drying temperature is 50-60 DEG C.

The invention has the beneficial effects as follows: raw material sources are convenient, and production technique is simple; Be prepared into powder dye, be convenient to transport, store and produce, production efficiency is high.

[embodiment]

Below in conjunction with specific embodiment, the invention will be further described.

The preparation method of a kind of onion-skin vegetable dye of the present invention, comprises the following steps:

Step 1: choose onion-skin, cleans, and dries, then is ground into 30-80 object plant powder with medicinal herb grinder;

Step 2: plant powder is placed in extractor, adds dehydrated alcohol, and stir and extract natural dye liquor in 3 hours, onion-skin is 1: 10-20 with the ratio of dehydrated alcohol, namely obtains dye solution after filter and remove residue;

Step 3: dye solution is heated to 65-70 DEG C, is concentrated into the dye concentrated solution that concentration is 40%-50%;

Step 4: by dye concentrated solution through Rotary Evaporators reduction vaporization, volatile dry makes natural dye powder, wherein, Rotary Evaporators is dry: vacuum tightness 0.085 MPa, drying temperature is 50-60 DEG C.

In sum, the invention has the beneficial effects as follows: raw material sources are convenient, and production technique is simple; Be prepared into powder dye, be convenient to transport, store and produce, production efficiency is high.

Claims

1. a preparation method for onion-skin vegetable dye, is characterized in that comprising the following steps:

Step 4: by dye concentrated solution through Rotary Evaporators reduction vaporization, volatile dry makes natural dye powder.

2. the mixed planting method of a kind of cassava as claimed in claim 1 and soya bean, is characterized in that: Rotary Evaporators is dry: vacuum tightness 0.085 MPa, drying temperature is 50-60 DEG C.