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Posted By: Atul Member Level: Diamond Posted Date: 02 May 2008
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2007 Anna University B.Tech Plastic and Polymer LT345 – SCIENCE AND TECHNOLOGY OF LEATHER AUXILIARIES Question paper
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ANNA UNIVERSITY :: CHENNAI – 600 025
MODEL QUESTION PAPER
VI - SEMESTER
B.TECH. LEATHER TECHNOLOGY
LT345 – SCIENCE AND TECHNOLOGY OF LEATHER AUXILIARIES
Time: 3hrs Max Marks: 100
Answer ALL Questions
PART – A (10 x 2 = 20 marks)
1. What is HLB. Explain its importance.
2. Name 2 chemical constituents of a Welting agent?
3. Explain chemical classification of syntans from application point of view.
4. Write the unit operations involved syntan manufacture.
5. What is sulphation. Explain the mechanism in the manufacture of fatliquors.
6. How are dyes classified. Mention the dyes used in the manufacture.
7. What are Pigments. Explain their role in the manufacture.
8. Explain Pigment buider
9. Formulate or Design a finishing receipt for p/cr resin upper leather.
10. Mention various Auxiliaries used in leather finishing.
PART – B (5 x 16 = 80 Marks)
11. What are soft and medium soft acrylic buider? Explain the industrial method for the production of acrylic buider in emulsion form.
12.a) Explain with reaction mechanism the chemistry and technology of acid dyes with the pelt collages or leather.
OR
12.b) What are resin fawning agents? Discuss the technology of its preparation and its specific used and advantages in leather manufacture.
13.a) Explain the process technology involved in the manufacture of fat liquors through sulpho chlorination.
OR
13.b) Explain the manufacture of an AOX free synthetic fatliquor.
14.a) Explain the role of Polyurethane’s in leather finishing.
OR
14.b) Explain the manufacture of casein based black pigment.
15.a) What is emulsion polymerisation? Explain the manufacturing of Implementing resins.
OR
15.b) Write short notes on:
(i) Feel modifiers
(ii) Matting agents
(iii) Top coats
(iv) Protein and Acrylic buider.
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