1. SRJC, Engr 45, Fall 2010 Jinwoo Lee Steven Flores Christian Rosko

2. Overview of the presentation Introduction Applications Variations Our little Experiment The End

3. Introduction What is Epoxy Putty? -A room-temperature hardening substance used as a space- filling adhesive (Wikipedia) -Made up of a hardener substance and a base substance -Basically, a set of epoxy liquid in a solid form for ease of use. -How to use? Just cut, mix like clay and apply !

4. Then what exactly is epoxy? ??????????????????????

5. Quick chemistry recap Epoxide Amine

6. Epoxy A thermosetting copolymer Formed from reaction of an epoxide “resin” with polyamine “hardener” Amine groups react with epoxide groups.

7. Epoxy Polymerization process is called “curing” The time taken for curing depends on the size and shape of epoxy substance, temperature and etc..

8. History of epoxy The first commercial attempt in 1927 in USA preparing resins from epichlorohydrin Fist synthesis of bisphenol-A-based epoxy resins by Dr. Pierre Castan of Switzerland and Dr. S.O. Greenlee of USA.

9. Applications Paints and coatings Adhesives Industrial Tooling and composites Electrical systems and electronics

10. Variations

11. Experiment Mighty Putty Claims to do these things.

12. Test #1 Leaking Pipe

13. Failed

14. Test #2 Leaking Pipe

15. Failed

16. Test #3 Leaking Pipe (Copper)

17. Worked It seems that Mighty Putty works better on strong metal surface than weak plastic surface.

18. Test #4 Tensile Strength

19. The Tensile Strength Machine gave 16 lb as the maximum load on the Mighty Putty Adhesive.

20. Test #5 Tensile Strength

21. Test #4 Tensile Strength The Tensile Strength Machine gave 32 lb as the maximum load on the JB Steel Weld Adhesive.

22. Tensile Strength Test 16 lb / (7.6 in x 2.9 in) = 0.7325 psi = 5050 Pa for Mighty Putty 32 lb / (7.6 in x 2.9 in) = 1.465 psi = 10100 Pa For JB Steel Weld

23. References http://www.ehow.com/list_6752835_uses-epoxy-putty.html http://hubpages.com/hub/Epoxy-Putty-Guide http://en.wikipedia.org/wiki/Epoxy#Paints_and_coatings