One-bath two-step scouring and dyeing method of reactive dye of cotton knitting fabric and cotton yarn

Abstract

The invention discloses a one-bath two-step scouring and dyeing method of reactive dye of cotton knitting fabric and cotton yarn. The formula thereof is as follows: 1.0 to 10 percent of reactive dye of B, M and KN type or K, KD and KE type (fabric or yarn weight), 30 to 100 g / L of sodium sulfate or salt, 2.5 to 3.5g / L of multifunctional color-fixing alkali with the bath ratio of 1:6 to 15; or 1.0 to 10 percent of reactive dye of B, M and KN type and K, KD and KE type, 30 to 100 g / L of sodium sulfate or salt, 0.5 to 1.0g / L of penetrating agent, 1.0 to 2.0g / L of refining agent, 10 to 15g / L of pure alkali with the bath ratio of 1:6 to 15. The scouring and dyeing process is as follows: cotton knitting fabric or cotton yarn, two-temperature scouring and dyeing (dyeing with the temperature of 60 to 65 DEG C or 80 to 90 DEG C and refining with the temperature of 95 to 98 DEG C), soaping, washing and finishing. The method improves yield, simultaneously reduces the using amount of water by about 30 percent when in scouring and dyeing, reduces production cost, reduces the discharge of sewage and is beneficial to environmental protection.

Description

Technical field [0001] The invention relates to a one-bath two-step dyeing method for cotton knitted fabrics and cotton yarn reactive dyes. Background technique [0002] Before dyeing cotton (cellulose fiber) knitted fabrics and cotton yarns, pretreatment (also called scouring) is generally required to remove impurities on the fabric or yarn. These impurities include non-cellulose substances in cotton fibers (pectin, wax and protein on cotton fibers) and possible slurry, dirt, and oil stains on the weaving process. If these impurities are not cleanly removed (not refined or the scouring effect is poor), it will inevitably affect the dyeing effect, and easily cause problems such as color stains, color spots, and decreased coloring brightness. Therefore, the current factory uses the processing method of scouring first and then dyeing. [0003] The dyeing of cotton knitted fabrics and yarns currently uses reactive dyes. Reactive dyes have the advantages of bright color, excellent co...

AI Technical Summary

Problems solved by technology

At present, the commonly used reactive dyes have a large difference between the fixation temperature and the scouring temperature (such as 60-65°C for reactive dyes such as B type and 80-90°C for reactive dyes such as K type), and the dyeing alkali agent is soda ash or alkali substitute ( pH value is around 11.5)