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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
Subject Code:2172608 Date:28/01/2021
Subject Name:Rubber Adhesion & Adhesion Science
Time:10:30 AM TO 12:30 PM Total Marks: 56
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Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Define the term: (1) Adhesion, (i) Adhesive. 03
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(b) Give the classification of Adhesives base on their functions. 04(c) Write the advantages and disadvantages of adhesives bonding. 07
Q.2 (a) Discuss about the Silico-Phosphate cements. 03
(b) Draw the schematic represents of types of stresses in adhesive joints. 04
(c) List out the important factors for adhesive selection. Explain any one in detail. 07
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Q.3 (a) How to overcome the poor tack in SBR? 03
(b) Write the suitable SBR adhesive formulation for Heat resistant adhesive application. 04
(c) Describe in detail about the Non vulcanizing Natural rubber based adhesive. 07
Q.4 (a) Write the functions of tackifier in rubber adhesive. 03
(b) Short note on: “Reclaimed rubber adhesive”. 04
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(c) Discuss the suitable combinations of accelerators system for NR latex adhesives. 07Q.5 (a) Write the three component solvent mixtures for preparing Nitrile Rubber adhesive. 03
(b) Short note on: “Heat activated Nitrile Rubber Adhesive”. 04
(c) Explain in detail about properties and testing of Neoprene rubber adhesives. 07
Q.6 (a) Listout the disadvantages of Neoprene rubber adhesives. 03
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(b) Describe the function of resins in Neoprene Adhesive. 04(c) Discuss in detail about compounding of Nitrile Rubber Adhesives. 07
Q.7 (a) List the curing system for butyl rubber adhesive. 03
(b) Give the name of resin which is used in Butyl rubber and Polyisobutylene adhesive. 04
(c) Describe the applications of Cyanoacrylate adhesives. 07
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Q.8 (a) Give the advantages of Cyanoacrylate adhesives. 03
(b) Mention the difference between Storage Life & Pot Life of adhesives. 04
(c) Discuss in detail about mixing and processing techniques for Butyl rubber Adhesive. 07
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