Reactive acid yellow dye for nylon and preparation method thereof

Abstract

The invention discloses a reactive acid yellow dye for nylon and a preparation method thereof, comprising: cyanuric chloride is reacted with m-phenylenediaminedisulfonic acid by condensation reaction; excessive sodium nitrite is added to perform diazotization; then 15% 1-(2',5'-dicloro-4'-sulfo)phenel-3-methyl-5-pyrazolonem solution is added and mixed evenly, the obtained solution is adjusted by alkali solution to show weak acidic pH and performs couple reaction; finally 20% p-(beta-sulfatoethylsulfonyl)aniline solution is added, appropriate acidity and temperature are adjusted and reactive acid yellow dye is obtained when the temperature is preserved. Not only physical bond but also chemical bonding exists between the reactive acid yellow and nylon fiber, thus showing strong combining capacity. In 30-60 DEG C routine tests, the dyed fabric of invention can be washed for a plurality of times without fading and has good wet-fastness; even on the washing conditions of steaming and detergent, the fabric also shows good fastness performance and migration, bright color and high degree of exhaustion.

Description

technical field [0001] The invention relates to the field of organic chemical synthesis, in particular to a reactive acid yellow for nylon and a preparation method thereof. Background technique [0002] Dyestuffs are organic compounds that impart bright and firm colors to other substances. Colorful dyes and pigments dress up the colorful world, and colors are closely related to our lives. Natural fiber, chemical fiber, plastic, rubber, food, medicine, cosmetics, ink, paint, bamboo, wood, rattan, grass, metal, leather, ceramics, enamel, glass, cement, building materials, paper, ink, wax and other cultures The coloring of articles requires us to synthesize tens of thousands of dyes (pigments) of different colors to meet the requirements of different fields and levels. At present, the dye (pigment) material synthesis technology has been transformed from the traditional type to the development of high-tech functional dyes and green environmental protection dye (pigment) materi...

AI Technical Summary

Problems solved by technology

[0012] (4) Discoloration and discoloration phenomenon: some dyes will fall off from the nylon fiber every time it is washed

Although repeated washing is not necessarily more staining than the previous wash, it will cause a gradual change in shade, especially when dyeing with mixed dyes

[0013] (5) Uneven dyeing: During the processing of nylon fibers such as polymerization, spinning, and drafting, due to physical and chemical reasons, it is easy to cause uneven dyeing of willows and stripes during dyeing.

[0021] When nylon is dyed with acid dyes, the color brightness is better, but the migration is poor, and it is easy to cause dyeing defects of willow and strip flowers; when dyeing nylon with weak acid dyes, due to the higher isoelectric point of nylon, The isoelectric point of nylon 66, which is close to neutral, is 6.5-7. When dyeing in a weakly acidic medium (pH=4-6), the dye and fiber are mainly combined through salt bonds and van der Waals forces, so the fastness is not good.

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