Modification method and dyeing process of a salt-free and low-alkali deep-dyed cellulose fiber fabric

Abstract

The invention discloses a modification method for a salt-free low-alkaline deeply dyed type cellulose fiber fabric and a dyeing process for the salt-free low-alkaline deeply dyed type cellulose fiber fabric. The modification method is characterized by comprising the following steps: (1) preparation of chitosan oligosaccharide; (2) preparation of reactive chitosan oligosaccharide derivative; (3) modification of cellulose fibers with the reactive chitosan oligosaccharide derivative, and dyeing of a modified cellulose fiber fabric with reactive dyes in a dyeing machine, so as to obtain the salt-free low-alkaline dyed fabric. The method for modification of the cellulose fibers with the reactive chitosan oligosaccharide derivative and the dyeing process have the advantages that the binding strength between the chitosan oligosaccharide and the cellulose fibers can be obviously improved, the adsorption capacity of the obtained chitosan oligosaccharide modified cellulose fiber fabric for the reactive dyes can be obviously enhanced, the cellulose fiber fabric can be dyed under the salt-free low-alkaline condition to achieve a certain deep dyeing effect, the color fastness is improved, the problems of color tone, ring dyeing, color lake and poor deep dyeing property of the salt-free low-alkaline dyeing process can be solved, and the defects of hardening, stiffness, chemical fiber and the like on the surface of the fabric processed with the high molecular weight chitosan oligosaccharide can be overcome; in addition, the best dyeing effect can be obtained through optimizing the dyeing process.

Description

Technical field:

[0001] The invention belongs to the field of salt-free and alkali-free deep-dyeable reactive dyes of cellulose fiber fabrics, in particular to a modification method of salt-free and low-alkali deep-dyed cellulose fiber fabrics and a dyeing process thereof. technical background:

[0002] Reactive dyes have the advantages of bright color, complete color spectrum, convenient use and low cost. At present, the dyeing of cellulose fiber fabrics is mainly dyed with reactive dyes, but reactive dyes are ionized in water to form dye anions that are negatively charged, and the ionization of certain groups in cellulose macromolecules will also make the fabric show negative points. The relationship between dyes and fibers There will be a large electrostatic repulsion between them, making it difficult for the dye to be dyed on the fiber. Therefore, a large amount of neutral electrolyte needs to be added during the dyeing process to reduce the charge on the surface of the...

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