Cellulose fiber liquid ammonia dyeing method

Abstract

The invention provides a cellulose fiber liquid ammonia dyeing method, which concretely comprises: adopting a cation modification agent and NaOH to treat cellulose fibers, sequentially carrying out hot water washing, cold water washing and acid washing, carrying out water washing to achieve a neutral state, and drying to obtain cationization cellulose fibers; and dissolving a dye capable of being dissolved in liquid ammonia in liquid ammonia, and immersing the prepared cationization cellulose fibers into the liquid ammonia dyeing solution to dye under a certain condition to obtain the dyed subject, wherein the condition comprises that a dye use amount is more than or equal to 10% (o.m.f), a bath ratio is more than or equal to 1:20, and a dyeing time is more than or equal to 20 seconds. With the present invention, problems of high production process energy consumption and heavy water pollution in the existing cellulose fiber dyeing are solved, a dye uptake rate and a color fixation rate of the dye in liquid ammonia dyeing are increased, a dye use amount is saved, advantages of less dyeing process steps, short dyeing time, recycling of dyed dye, environmental pollution reduction, and the like are provided, and waterless dyeing requirements during a fiber dyeing process can be achieved.

Description

technical field [0001] The invention relates to the technical field of dyeing, in particular to a liquid ammonia dyeing method for cellulose fibers. Background technique [0002] In recent years, the contradictions in the development of my country's textile industry's ecological circular economy have become increasingly prominent, especially the high dependence on water resources and the environmental problems caused by high emissions have seriously restricted the sustainable development of the industry. According to incomplete statistics, the annual water consumption of my country's textile printing and dyeing industry is 1.7 billion tons, and the sewage discharge is as high as 1.6 billion tons. Compared with foreign countries, the water consumption of my country's textile printing and dyeing industry is 2-3 times that of foreign countries, and the energy consumption is 3-5 times that of foreign countries. Because the traditional dyeing method uses water as the medium, was...

AI Technical Summary

Problems solved by technology

[0004] Adding NaOH aqueous solution to liquid ammonia will make the liquid ammonia dyeing technology still unable to get rid of the dependence on water. In addition, after adding NaOH, it may cause hydrolysis problems of reactive dyes in the liquid ammonia-water mixed system, which is not conducive to subsequent dyeing in liquid ammonia. Circular use in ammonia dyeing

For the color fixation problem of liquid ammonia dyeing, although the dyed sample is fixed by 2D resin finishing, it causes the sample to feel hard

It has been reported that cationic modification of fibers can improve the exhaustion rate and dye uptake rate of dyes in the dyeing process, but there is no relevant research report on improving the color fastness of dyed products dyed with liquid ammonia dyeing technology.