Correct dyeing process for reactive dyes
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Reactive dye dyeing process for soaped fabrics
① Try to use higher humidity for dyeing. If medium-wet normal-wet dyes are used for dyeing, the dyeing humidity can be increased from 60℃~65℃ to 75℃~80℃, and then lowered to 60℃~65℃, and alkali is added to fix the color.
② Adopt alkali-adding color-fixing process. During the process of adding alkali to fix the color, the dye will undergo a bonding reaction with the fiber and will also undergo a hydrolysis reaction with water to produce a floating dye. The speed of the hydrolysis reaction is directly related to the strength of the fixation conditions. The more severe the fixation conditions and the stronger the alkalinity, the faster the dye will hydrolyze. Generally, the temperature is 60℃~65℃, and the color-fixing alkali agent is a single soda ash. The pH value is stable at about 11, and the soda ash is added in batches.
③ Washing and soaping: The purpose of washing after dyeing is to remove the residual alkali agent on the fiber to prevent the bonded and fixed dyes from being damaged during high-temperature soaping. High-temperature alkalinity causes bond-breaking hydrolysis and falls off from the fiber.
When washing with water, please pay attention to the following matters:
. Clean water must be used before soaping. Wash first.
Second, choose a soaping agent with good washing ability, dispersing ability, emulsifying ability and dirt-carrying ability.
Third, it is better to add 1~2g/L chelating dispersant to the soaping liquid.
Fourth, soaping must be carried out under neutral conditions (pH=6~7).
Fifth, it must be soaped at high temperature.
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