Question

Dispersed dye was originally developed for the dyeing of cellulose acetate, and are water insoluble this dye is mainly used to dye:
A) Nylon
B) Polyester
C) Both A and B
D) Wool

Answer 1

Hint: There are different types of dyes such as vat dyes, basic dyes , insoluble azo dyes and disperse dyes. The vat dye is used for the dyeing of the fibre cellulose by undergoing the redox reaction. In the coloration of the paper the use of basic dye is done. The water insoluble dye is dispersed dye. In the azo dyeing process the use of azo dye is done.

Complete step-by-step answer:
The disperse dye as I told you that they are insoluble dye and is widely used for dyeing nylon, polyester, acrylic fibres. The pressure and the temperature which is applied during the process of disperse dyeing should be high. The azo dye is also used for nylon and polyester formation. The fibres are treated with the diazo and the coupling components so that the desired product is obtained. These azo dyes are produced directly on the fibres during the azo dyes process. But let me tell you that the usage of such dyes is limited because of its hazardous nature.

Hence the correct answer is option ‘C’.

Note: The dyes of sulphur is costly and is mainly used for dyeing cotton with mainly dark colours. During this dyeing the fabric is treated with nitrophenol derivative and sulphide. Even basic dyes are also used for the production of the nylon and polyester.