How to Dye Aramid 1313?

2016-03-18 08:20 | writer: admin

Aramid 1313 has quite high glass transition temperature and crystallinity, it is very difficult to dye. The conventional method does not work, even if some fibers did, the color fastness is poor. In order to resolve this problem, countries around the world use a suite of special staining methods.
1, Solvent dyeing process: the disadvantage is needed more water to remove the solvent in aramid after dyeing, formaldehyde can lead to poisoning in human, and difficult to recall solvent.
2, Spinning dope dyeing spun dyeing: The characteristics of this means are color uniformity and good color fastness. The disadvantage is that only can offer few color varieties and design, and only suitable for bulk production.
3, Carrier dyeing process: this is the most common dyeing method for aramid fiber. This method is simple and bright in color, each item of color fastness can meet grade 3-4. The disadvantage is  bringing great harm to human and environment.
4, Continuous and fast open width dyeing: with high boiling nonpolar organic solvent dyeing medium, the fabric color is light and has poor fastness, because the dye is poor in dyeing medium.
5, Coating methods: convenient and feasible, but the fabric has poor hand feeling and comfort, which will affect the fire retardant property. 
The most of past aramid/cotton fire retardant fabric in China adopt coating and dye joint dyeing, meanwhile combining with the cotton fire retardant treatment, the process is too long and the fabric hand feeling is stiff. Under high temperature and high pressure use cat dyes, acid dyes and disperse dyes to dye the aramid 1313, neither can get satisfactory result.
In order to result aramid 1313 coloring problem and improve the color fastness especially the light fastness at the same time, we can use extraordinarily high temperature and high pressure expanding method to dye aramid 1313.

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