A kind of modified carboxymethyl starch polymer and its preparation method and application

Abstract

The invention discloses a modified carboxymethyl starch polymer and its preparation method and application. The modified carboxymethyl starch polymer is prepared from the following raw material components in parts by mass: carboxymethyl starch 33~ 42 parts, 1 to 5 parts of modifier, 1 to 5 parts of vinyl isocyanate, 2 to 6 parts of epichlorohydrin, 0.2 to 0.8 parts of initiator, 48 to 62 parts of desalinated water, which are used as dry and wet rubbing fastness improvement When the agent is used, it has the advantages of high color fastness, can improve the dry and wet fastness, and the color fastness to washing with desalinated water, has little effect on the shade of sensitive colors, and has the advantages of less dosage.

Description

technical field [0001] The invention belongs to the field of textile dyeing and finishing auxiliaries, in particular to a modified carboxymethyl starch polymer and its preparation method and application. Background technique [0002] Reactive dyes, also known as reactive dyes, are a class of dyes that chemically react with fibers during dyeing. Because of its own characteristics, such as low price, complete color spectrum and bright color, it is widely used in cotton fabric dyeing. Such dye molecules contain reactive groups, which are easy to react with fibers, and the two are combined with covalent bonds to improve the fastness to washing and rubbing, but the color fastness is not ideal. During the dyeing process, especially when dyeing dark colors, there will often be a large amount of unfixed reactive dyes on the dyed fabric due to the high concentration of the dye. These unfixed dyes are difficult to wash off from the dyed fabric. This part The dye will fade during the...

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Problems solved by technology

This kind of dye molecule contains reactive groups, which are easy to react with fibers, and the two are combined with covalent bonds to improve the fastness to washing and rubbing, but the color fastness is not ideal

During the dyeing process, especially when dyeing dark colors, there will often be a large amount of unfixed reactive dyes on the dyed fabric due to the high concentration of the dye. These unfixed dyes are difficult to wash off from the dyed fabric. This part The dye will fade during the washing process; at the same time, the chemical bonds formed between some active groups and fibers are easy to desalinate and hydrolyze, resulting in low wet fastness

Researchers have tried various methods to improve the rubbing fastness of fabrics, such as strengthening the pre-treatment of fabrics, selecting suitable dyes, improving the dyeing process, and properly treating or finishing fabrics. However, for many dark fabrics, The effect is not ideal

Most of the currently developed additives that can significantly improve the wet and dry rubbing fastness of dark fabrics are acrylic copolymers or water-based polyurethanes with special structures, which have certain effects on improving the wet and dry rubbing fastness, but they are environmentally friendly. There are defects, therefore, the study of new and efficient wet and dry rubbing fastness enhancers for reactive dyes that is ecologically friendly and formaldehyde-free has broad market application prospects

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