Anna University Dyeing of Protein Fibres
Time : 3 Hours Max : 100 Marks
PART – A Answer the following questions :- (10 x 2 = 20)
1.State the chemical composition of Wool.
2.What do you mean by Milling and Potting?
3.State the chemical composition of Acid dyes?
4.State the chemical composition of Reactive dyes.
5.Give the classification of Natural dyes.
6.State the advantages and drawbacks of dyeing with Natural dyes.
7.State the chemical composition of Basic dyes.
8 .Compare the important application properties of Reactive, Acid and Basic dyes.
9.Give a classification of Reactive dyes.
10. What a Metal Complex dyes? Brief their areas of application.
PART – B
11.A Explain in detail how scouring of wool can be done. (10)
B Give a note on carbonizing (6)
i)Explain the chemical composition of Silk? Also explain how degumming of silk can be done. (10)
ii)What are the various bleaching agents for silk? Explain Bleaching of silk using them.
i)Explain the importance of isoelectric point in the dyeing of protein fibres. (8)
ii)Give different types of acid dyes based on application. (4)
iii)What is the effect of electolyte on dyeing of protein fibres? (4)
i) Explain the mechanism of dyeing protein fibres with acid dyes. (10)
ii) What do you mean by “Stripping and Re-dyeing”? (6)
i)Explain the chemical reactions involved in dyeing of silk with reactive dyes. (8)
ii)Give note on application of monochloro dyes on Wool. (4)
iii)Discuss the application of vinyl sulphone dyes on protein fibres. (4)
i) Explain how wool can be dyed using bifunctional dyes. (8)
ii)Discuss stripping and redyeing of reactive dyes on silk. (8).
i) Explain how silk can be dyed with yellow dyes using turmeric. List out other natural raw material for the same shade. (8)
ii)Discuss the role and need of natural dyes. (4)
iii)What are mordents? Name the mordents suitable for dyeing of Protein fibres. (4)
i)Explain how wool can be dyed with red dyes using manjit. (6)
ii)Explain how black dyes using log wood can be applied on protein fibres. (6)
iii)Explain the role of mordents. (4)
i) Explain the dyeing mechanism of basic dyes with protein fibres. Explain after chrome method. (8)
ii)Give the application procedure for dyeing of Wool using chrome dyes. (4)
iii)Give note on properties of chrome dyes. (4)