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What are the dyeing auxiliaries for wool and spandex blended or interwoven fabrics?

Views: 0     Author: Site Editor     Publish Time: 2022-02-01      Origin: Site


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Wool and spandex blended or interwoven fabrics are a kind of textiles with particularly good elasticity. Before scouring, the fabrics can be treated in a solution of 40-45 °C for 20 minutes to fully relax, which is very beneficial to the processing reproducibility of spandex. In addition, the fabric should be prevented from being stretched by large tension during processing; the temperature should be lower during heat-setting, and it should be treated at 175-180 ° C for 45-60 s; and the door width and overfeeding should be controlled. For dyeing, dyes with high migration properties, such as Neolan dyes, are used, which have good levelness and fastness. The blended or interwoven fabric of polyester/wool/spandex fibers must be dyed with disperse dyes. On the one hand, it cannot be dyed at high temperature to prevent damage to spandex and wool. Therefore, disperse dye accelerators should be added during dyeing.

For example, adding Univadine PS during dyeing can reduce the dyeing temperature to below 120 ℃, and can also reduce the staining of wool and spandex by disperse dyes. On the other hand, caustic soda high-temperature reduction cleaning cannot be used to reduce the damage of wool. At this time, a weak alkali (adjust the pH value with ammonia water to about 8.5) can be used at 45 to 50 ° C, treated with a stable reducing agent for 20 minutes, and can also be added Cibapon OS to reduce the staining of disperse dyes to spandex and improve wet fastness. Studies have shown that polyester can be dyed at 100-125 ℃ by using special auxiliaries, and these auxiliaries can also promote the dyeing of wool and spandex with disperse dyes, so as to achieve the effect of dyeing a variety of fibers in one bath and one step with a disperse dye . For example, in the presence of a solubilizer, superfine polyester and wool can be dyed with disperse dyes, which can be dyed dark at 100 ° C, and the fastness is good, but disperse dyes should be selected.

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