Dyeing process of red vegetable dyes

Abstract

The invention discloses a dyeing process of red vegetable dyes. The process comprises the following steps: a, treating safflower cakes by an acidic solution, so as to obtain a filter residue A; b, rinsing and filtering the filter residue A by an alkaline solution, so as to obtain a dyeing liquor; c, making a dye C1; d, mixing the dye C1 and a dye C2, so as to obtain a dye D; e, mixing the dye D and a weakly alkaline aqueous solution, so as to obtain a dyeing liquor E1 and a dyeing liquor E2; f, respectively pretreating the heated dyeing liquors (E1 and E2), so as to obtain the dyeing liquors (F1 and F2); g, pretreating a silk fabric, so as to obtain a product G; h, adding the product G into the dyeing liquor F1 for dyeing, so as to obtain a product H; i, adding the product H into the dyeing liquor E2 for dyeing, so as to obtain a product I; j, treating the product I, so as to obtain a finished product J. The dyeing process disclosed by the invention has the characteristics of low production cost, good coloring effect, high color fastness, convenience in large-scale production, and capacities of improving the extraction rate of haematochrome and the impurity removal rate and facilitating safflower storage.

Description

technical field [0001] The invention relates to a dyeing process, in particular to a red vegetable dye dyeing process. Background technique [0002] In order to meet the production needs, textile factories use a large number of dyes made of chemical synthetic dyes for dyeing. However, chemically synthesized dyes often contain carcinogenic substances in their raw materials and intermediates, which will have a certain impact on the health of consumers after long-term use. , and the waste will also pollute the environment. Compared with chemically synthesized dyes, plant dyes use pigments from natural plants without adding any chemical substances during the dyeing process, and some natural pigments also have certain health care functions, which are very popular among people. Red has been a color that has been loved by the people since ancient times in China. China has long had the technology of extracting red pigment from plants for dyeing, especially safflower; because safflo...

AI Technical Summary

Problems solved by technology

Red has been a color that has been loved by the people since ancient times in China. China has long had the technology of extracting red pigment from plants for dyeing, especially safflower; because safflower has medicinal value, so The cloth dyed with its dyes also has certain health effects, but the price of safflower is relatively high at present. If only safflower is used as raw material for dyeing, the cost of dyeing will be increased; and compared with chemically synthesized dyes, the traditional The red dyes produced by the method are unsatisfactory in terms of color uptake and color fixation; at the same time, the manufacturing process of traditional plant dyeing is lengthy and complicated, and the dyeing process and quality are carried out by the experience of workers, which cannot be achieved. mass production

In addition, because safflower contains yellow and red pigments, the yellow pigments need to be removed because they have no dyeing value. At present, yellow pigments are generally removed by using the characteristics of being easily soluble in water and acidic solutions, but the removal effect is not ideal. , causing the extracted red pigment to be doped with yellow pigment, reducing the purity of the red pigment. The traditional red pigment extraction method cannot efficiently extract the red pigment, resulting in part of the red pigment remaining in the safflower cells, resulting in waste of resources and improving Production costs; and because safflower is an annual plant, in order to ensure the normal amount of dye used throughout the year, it is usually necessary to reserve a large amount of safflower, but safflower is prone to deterioration during storage and the red pigment inside it is destroyed

Therefore, the existing technology has problems such as high production cost, unsatisfactory coloring effect, low color fastness, inability to scale production, low red pigment extraction rate, low impurity removal rate and difficult storage of safflower.