Fiber-material modifying method and dyeing process

Abstract

The invention provides a brand-new method to change the nature with the fibrous material and the environmental protection staining method to textile printing profession. Its characteristic lies in: join the prepolymer comprising the reactive hydrogen and the response functional group to the fibrous material. Chemical reaction between prepolymer's links the macro-molecule chain polymer, and solidifies on the fibrous material. The prepolymer nitrogen's percentage is: 5-45%. In this prepolymer at least one kind in hydrogen groups and bases, hydroxyl, amidogen and imides-group is included, and one kind of response functional group comprising chloromethyl group, epoxy group and 3-hydroxyl nitrogen heterocyclic ring butyl and the like, or combinations with any proportion of the three response functional groups are also included. After changing the nature, the fibrous material carries on the conventional craft dyeing with the anion dye or the coating in the environment without salt, the alkali, the urea. This invention has the craft to be simple, the dye use factor high, and the assistant amount few, which reduces the production cost, has saved the massive energy, and reduces the environment pollution.

Description

technical field [0001] The invention relates to a method for modifying fiber materials, in particular to a pretreatment method for fiber materials before dyeing and a dyeing process thereof. Background technique [0002] In the existing cotton dyeing process, anionic reactive dyes are generally used. However, the anionic groups in reactive dyes have an electrostatic repulsion effect on cotton fibers, which hinders the diffusion of dyes to fiber materials, resulting in slow dyeing speed and low dyeing rate during the dyeing process. Therefore, in the existing dyeing process, it is necessary to use a large amount of electrolyte (salt) in the printing and dyeing process to overcome the electrostatic repulsion. At the same time, the existing reactive dyes must react with the hydroxyl groups on cellulose fiber materials such as cotton under alkaline conditions. The reaction environment in the presence of alkaline agents inevitably leads to a large amount of hydrolysis of reacti...

AI Technical Summary

Problems solved by technology

Using this cationic modifier in the printing and dyeing process can realize the purpose of not using salt in the dyeing of reactive dyes, but the cationic modification process can only solve the problem of adsorption of anionic dyes, but cannot change the reaction of reactive dyes with cotton and other fibers Sexuality and dye hydrolysis

At the same time, there are problems of cumbersome use of modifiers and the hydrolysis of modifiers themselves.

Therefore, the fiber material modification method and its dyeing process with practical value have not been widely accepted by domestic and foreign printing and dyeing industries so far.