Reactive acid red dye for nylon and preparation method thereof

Abstract

The invention discloses a reactive acid red dye for nylon and the preparation method thereof. Firstly, cyanuric chloride and lentine sulfoacid react in a condensation way; secondly, low-concentration alkali solution is used for regulating the pH value to subacidity, hydrochloric acid and ice are added immediately, and sodium nitrite solution is added for diazo reaction; thirdly, 10 percent of gamma acid solution is added, aqueous alkali is used for regulating the pH value to subacidity after uniform stirring, and the step of stirring is carried out for coupled reaction; and finally, 20 percent of p-beta-sulfuric acid ester ethyl sulfuryl aniline solution is added for condensation reaction, proper acidity and temperature are regulated after the condensation reaction is accomplished, and the reactive acid red dye can be obtained after heat preservation. The reactive acid red dye has physical force bonding and chemical bonding with nylon fibres, thereby showing higher binding ability. In a 30 to 60 DEG C routine test, a dyed fabric of the reactive acid red dye can withstand multiple times of rinsing, has favorable wet fastness, can still show favorable fastness performance even under the conditions of steaming and water scrubbing of washing agent, and has favorable mobility, fresh 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 red used 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) mate...

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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