Vinyl Sulphone Reactive Dyes Structure

Reactive vinyl sulphone base dye fastness properties.

Vinyl sulphone reactive dyes structure. Removal of any unfixed dye after completing the dyeing cycle is enhanced since the substantivity of hydrolysed dye is low. Reactive red rb reactive red 198. The application of vinyl sulphone dyes for cotton and cellulosics the combination of the vinyl sulphone reactive group with cellulosic fibres exhibits excellent stability to acid hydrolysis. S f t x fibre s f t x fibre.

Yellow fg yellow 42 100. Reactive red 4b reactive red 24. This group reacts chemically with the fiber polymer molecules to form covalent bonds. Light washing perspiration hypochlorite.

It is specially used in bright yellow colours such as reactive yellow 15 cas. Reactive dyes are most commonly used in dyeing of cellulose like cotton or flax but also wool is dyeable with reactive dyes. If we assume the general structure of reactive dye is s f t x then this can be described as. In a reactive dye a chromophore an atom or group whose presence is responsible for the colour of a compound contains a substituent that reacts with the substrate.

This covalent bond is formed between the reactive group and terminal oh group of cellulosic fibers and terminal nh 2 group of polyamide and wool fiber. Reactive dyes are so called because this is the only type of dye that has a reactive group. Reactive red c2g reactive red 106. Reactive dyes have good fastness properties owing to the covalent bonding that occurs during dyeing.

Dyes having an acrylamido based reactive system were developed by basf primazine dyes and ciba geigy lanasyn lanasol dyes. Reactive red 5b reactive red 35. It is also known as golden yellow gr. Yellow gr yellow 15 100.

Ribazol vinyl sulphone dyes ribazol dyes containing vinyl sulphonate group as a reactive radical. The general structure of these dyes is d nhco chx ch 2. It is used to manufacture reactive red 278 which is also known as reactive deep red cd. Aricol vinyl sulphone dyes.

Yellow gl yellow 37 80. These dyes are bifunctional reactive dyes which are featuring more than two different reactive groups within one molecule. Reactive orange 3r reactive orange 16. The oldest and most common intermediate is vinyl sulfone parabase ester see image an aniline substituted with a 2 sulfooxy ethyl sulfonyl group.

The carbonyl group is a less powerful electron withdrawing group so the reactivity of these dyes is less compared with vinyl sulphone dyes. Para cresidine vinyl sulphone is widely used as reactive dyes intermediates. Yellow rnl orange 107 100. G yellow r yellow 77 100.

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