Method for preparing colored polyacrylonitrile fibers

Abstract

The invention relates to a method for preparing colored polyacrylonitrile fibers, which comprises the following steps: (1) mixing water-soluble cationic dye, powder or slurry polyacrylonitrile polymer and water, adjusting the pH value of the mixture to 2 to 6, heating the mixture to between 95 and 100 DEG C, preserving the heat, and drying the mixture; (2) dissolving the dried mixture in solution of sodium thiocyanate to obtain spinning stock solution of the colored polyacrylonitrile fibers, and defoaming the solution at the temperature of between 40 and 80 DEG C; and (3) treating the defoamed spinning stock solution through conventional wet spinning to obtain the colored polyacrylonitrile fibers. The method of the invention is simple, has low cost and light pollution, and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of preparation of polyacrylonitrile fibers, in particular to a preparation method of colored polyacrylonitrile fibers. Background technique [0002] Since the industrialized production of polyacrylonitrile fiber, it has developed rapidly because of its excellent performance and sufficient raw materials. Polyacrylonitrile fiber is a common fiber widely used in civilian textiles. Common polyacrylonitrile fiber products are not dyed, and cationic dyes are basically used for printing and dyeing after the 1980s. There are two methods of staining: exhaust method and gel staining. The disadvantage of the depletion method is that the process takes a long time, the dyeing is uneven, the energy consumption is large, and the dyeing produces a large amount of waste water. The cost of the corresponding dyeing equipment for colored products increases a lot; while the gel dyeing method can reduce the dyeing time. , On the basis o...

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Problems solved by technology

The disadvantage of the exhaustion method is that the process takes a long time, the dyeing is uneven, the energy consumption is large, and the dyeing produces a large amount of waste water. The cost of the corresponding dyeing equipment for colored products increases a lot; while the gel staining method can reduce the dyeing time. , On the basis of the original production, it reduces the investment funds, reduces the cost of colored products, etc., but when dyeing, because the dyeing time of the tow is affected by the running speed, the color is unstable, especially for light colors, and it is difficult to dye uniform colors , the unfixed dyes are also difficult to be removed during dyeing, the cationic dyes used have higher requirements, and the shortcomings such as the powder cationic dyes currently available on the market cannot be directly used, which limit its further development to a certain extent

Although the acrylic fiber stock solution coloring method that has emerged recently can be easily applied to areas that require particularly high light fastness and color fastness, such as sunshade tarpaulins, beach umbrellas, etc., but there are fabrics that feel stiff and have fewer chromatographic varieties. Incomplete, not bright enough colors and other shortcomings greatly limit its further development

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