Dyeing method of natural fiber

Abstract

The invention discloses a dyeing method of a natural fiber. The dyeing method comprises the following particular steps of firstly, adding natural vegetable dye, liquid carbon dioxide and a color fixing agent into a supercritical carbon dioxide dyeing device, heating, and maintaining for a certain time; afterwards, adding the natural fiber into the supercritical carbon dioxide dyeing device, dyeingat and under certain temperature and pressure, and maintaining for a certain time; next, relieving the pressure, cooling to a normal temperature and depressurizing to normal pressure to obtain a preliminarily dyed natural fiber; treating the preliminarily dyed natural fiber, afterwards, adding into the supercritical carbon dioxide dyeing device, dyeing at and under certain temperature and pressure, maintaining for a certain time, and then relieving the pressure to obtain a finished-product dyed natural fiber. The dyeing method, through a two-step dyeing method, is used for realizing printingand dyeing the natural fiber by natural dye, and further, does not need pretreatment, and the dyeing method has advantages of good environmental protection effect, water resource conservation, good color fixation effect and the like.

Description

technical field [0001] The invention relates to the technical field of natural fiber dyeing, in particular to a natural fiber dyeing method. Background technique [0002] Supercritical carbon dioxide fluid is a green and environment-friendly fluid medium. It replaces the traditional water bath for dyeing and processing fiber textiles. It has the characteristics of environmental protection and clean production, as well as outstanding energy-saving and consumption-reducing effects. The status quo of high resource consumption, large amount of sewage discharge, and serious environmental pollution is of great significance. [0003] At present, synthetic fiber textiles such as polyester, nylon, acetate, and acrylic can be dyed satisfactorily by using hydrophobic disperse dyes in supercritical carbon dioxide fluid. However, the supercritical carbon dioxide fluid dyeing of hydrophilic natural fibers, such as cotton, real silk, wool and other fiber textiles, which account for a larg...

AI Technical Summary

Problems solved by technology

However, the interaction between natural vegetable dyes and cotton fibers is weak, and there are problems of low color depth and poor fastness after dyeing cotton fibers, which limits the application of natural vegetable dyes in supercritical carbon dioxide cotton fiber dyeing technology.

[0006] At present, most of the dyeing experiments of natural fibers require pretreatment, and sometimes the fibers need to be washed in water or solvent after dyeing to remove the pre-impregnated substances on the fiber surface, thus losing the ability of anhydrous supercritical carbon dioxide dyeing. The main advantage, in addition to the additional energy-intensive treatment and drying steps of the fibers that are unnecessary in conventional aqueous dyeing

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