Preparation method of lychee seed natural dye and application thereof as fabric coloring agent

Abstract

The invention discloses a preparation method of a lychee seed natural dye and application thereof as a fabric coloring agent. The preparation method of the lychee seed natural dye comprises the following steps of: cleaning, air-drying and mechanically crushing lychee seeds; adding the crushed lychee seeds to an ethanol water solution containing 10-15g / L sodium hydroxide; reflowing and extracting at a temperature of 70-90DEG C for 1-2h to obtain an extraction solution; then filtering, and distilling the extraction solution at a reduced pressure to obtain the concentrated lychee seed natural dye, wherein the volume percent concentration of the ethanol water solution is 10-20 percent, the mass ratio of the crushed lychee seeds to an ethanol water solution 1:(10-30), and the volume of the concentrated lychee seed natural dye is 1 / 6-1 / 2 of that of the ethanol water solution. The preparation method disclosed by the invention adopts a simple process and has high extraction rate of effective components. The obtained dye has favorable compatibility with the ecological environment and can be biologically degraded. According to the preparation method disclosed by the invention, the natural dye is prepared by using the lychee seeds, thus the prices is low, resources of natural world are fully utilized and the market prospect is very wide.

Description

technical field [0001] The invention relates to natural dyes and the field of application thereof, in particular to a preparation method of lychee seed natural dyes and an application as a fabric dye. Background technique [0002] Natural dyes are extracted from plant roots, leaves, bark, husks, flowers, or animal secretions, minerals, and will not cause environmental pollution during the preparation process, and can be degraded by the environment. In addition to dyeing, some natural dyes also have the function of medicine and health care. With the increasing awareness of environmental protection and the wave of advocating green consumer products, natural dyes have broad application prospects in the fields of high-end silk products, health underwear, home textile products and decorations. [0003] Litchi is a plant of the genus Litchi in the Sapindaceae family, an evergreen tree, produced in southwestern, southern and southeastern China in Guangdong, Guangxi, Fujian, Sichua...

AI Technical Summary

Problems solved by technology

[0004] After searching the existing technical literature, it was found that the extraction of brown pigment from litchi kernels by Chen Jie in the master's degree thesis of Jinan University "Research on the Chemical Composition of Litchi Kernels (I) - Pigment Extraction and Amino Acid Determination" (June 2006) and stability were studied; Wang Haiyan in "The Extraction and Stability of Brown Pigment from Litchi Kernel" ("Guizhou Chemical Industry", Volume 28, 2003, P: 18-20), the extraction method is carried out in ethanol solution , the extraction efficiency is poor

[0005] At present, the research on litchi kernels is only used in a small amount in traditional Chinese medicine and food coloring, and there are no reports at home and abroad on the preparation method and application technology research of litchi kernel natural dyes.