Lecture 16

More documents

Recommendations

Info

Rubber Polymer Type : Natural Rubber2.3.1 Natural rubber , NR• Extracted from rubber trees with present suppliers being Malaysia, Indonesia, SriLanka, Nigeria and others.• Polymer is polyisoprene,• Vulcanized products made have high mechanical strength and very good dynamicmechanical properties• Can be compounded to have excellent elasticity (ability to snap back to theiroriginal shape).• NR has very good abrasion resistance ,• low relative cost,
Rubber Polymer Type : Natural RubberApplications of NR :• slurry pump liners and impellers as well as for tank linings.• Tires, rubber springs and vibration mounts.• excellent for fine particle impact applications. NR rubber has a very highelasticity, thus most of the kinetic energy of an impacting particle isconverted into deformation which then releases the energy by returningto its original undeformed state.• It also has very good low temperature resistance, down into the region of-57 ˚C at which its stiffness shows a considerable increase.• Its high temperature heat aging resistance limit for 'continuous' use is inthe region of 75 ˚C . Significant components of weather resistance, are UVlight and ozone. Addition of carbon black to a compound gives resistanceto UV. Antiozonants and waxes, and helps with ozone resistance. Ozoneattack is of most concern for thin products and those that are subjected tostretching in service.• Electrical insulation is very good and is dependant on compounding.• Resistance to petroleum oils is poor while resistance to alcohols (such asethanol and methanol) and ketones (such as methyl ethyl ketone (MEK)and acetone) is much better.• Synthetic polyisoprene (IR) has basically similar properties to those of NRand has a more consistent rate of curing and processing characteristics, ata presently slightly higher relative price.
Page 4 and 5: Rubber - Effect of Vulcanizing
Page 9 and 10: Rubber Polymer type : Nitrile Rubbe
Page 11 and 12: Rubber Polymer type : EPDM Rubber2.
Page 13 and 14: Rubber Basics : FluoroelastomersHHF
Page 15 and 16: Rubber Polymer type : Fluorocarbon
Page 17 and 18: Rubber Polymer type : Silicone Rubb
Page 19 and 20: Rubber Polymer type : Trade Names
Page 21 and 22: SAE J200 Rubber Classification
Page 23 and 24: SAE J200 Rubber Classification
Page 25 and 26: Typical Rubber Compound Ingredients
Page 27 and 28: Rubber Compounding Ingredients : Cr
Page 29 and 30: Rubber Compounding Ingredients : Ac
Page 31 and 32: Rubber Compounding Ingredients : Fi
Page 33 and 34: Rubber Product : TiresBuilding the
Page 35 and 36: Rubber Belts for Conveyors and Pull
Page 37: Rubber Product : Compression Mouldi

Lecture 16

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?