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What is the operation process of reactive dyes?
Apr 24, 2018

Reactive dyes have many names, such as reactive dyestuffs, reactive dyes for textiles, reactive dyes for clothing, etc.

1. Dyeing properties of reactive dyes

When the reactive dye is dyed, the dye can be dyed directly on the cloth. At the same time, it is easy to spread the dye into the fiber inside because of its good diffusion ability. But because the fashion does not react with the fiber, it is easy to wash off most of the dyes with water, so it is necessary to use the alkali agent to make the dye and fiber chemical reaction, so that the dye must be reacted with the fiber, so that the dye must be chemically reacted with the fiber. The dye is fixed on the fiber. The former is called dyeing, and the latter is called solid color.

Two. The operation process of reactive dyes

Reactive dyes can be used in two ways of dyeing and pad dyeing according to different dyeing requirements.

1, coiling

The dyeing process is suitable for small batch and multi variety production. It is easy to dye, flexible and can be dyed shallow, medium and dark. Because of the different type of dye, the direct size of the fiber is different, so the dyeing condition, the fixation temperature, the amount of alkali agent and the amount of electrolyte are different.

The reactive dyestuff dyeing operation is to wash the fabric after the scouring to go back and forth at 80~90 centigrade hot water, then walk several channels in cold water to close to the dyeing temperature, add dissolved dyes to 2 to 3 channels, and then dye the electrolyte in 3 to 4 channels, and dye the color 5 to 6 channels.

Operation process:

Fixing color, cold water, hot water, soap wash, hot water, cold water, and drying.

Dongguan Tiansheng chemical reminds you that in the dyeing operation, the pH value of the dyestuffs should be controlled in the neutral condition, too high is unevenly dyed, and it is easy to cause the hydrolysis of the dye. After the hydrolysis of reactive dyes, the ability to dye the fibers is lost. Therefore, two times before washing, some K reactive dyes need to be dyed at high temperature. In order to maintain dyeing and fixing temperature, the VATS should be covered with a cover to prevent the quality from being affected by the steam escaping and uneven coil temperature.

The alkali agent is used for fixing color, and it can also be used in sodium phosphate three.

2. pad dyeing

The dyeing of reactive dyes is divided into one bath and two bath.

1, one bath method: the dye and the alkali agent put together, the alkali agent is baking soda, after rolling through steam or baking, baking soda decomposition of sodium formate, so that the pH value, is conducive to dye fixation, X type reactive dyes use one bath method.

2, two bath method: after soaking the dye solution, soak the solid solution containing the alkali agent, then steam the color, the alkali agent can be soda or phosphoric acid three sodium, also can add soda in the first bath, and add soda when the second bath is fixed.

The following is the introduction of the two bath process as an example.

Two bath process flow process:

Dip dyeing, pre drying, drying, infiltration, color fixing, steaming, washing, soaping, washing and drying.


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