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- 2. What is rubber? • It is a polymeric material • Characterised by reversible deformation • Deformation rate depends on the structure and molar mass of the deformed rubber and on external conditions of the deformation • It is made up of loosely joined molecules • Different types of rubber exist but natural rubber has the structure of isoprene • To be useful as an engineering material there is need to undergo a curing stage known as Vulcanisation
- 3. History • 1600 bc latex extraction from the Hivea tree • Latex is known as the white blood of the forex • Initially used by the South Americans • In 1525, Padre d'Anghieria reported that he had seen Mexican tribes people playing with elastic balls. • During 16th century documented the many uses of latex such as waterproofing, shoes
- 4. History Rubber Barons • In the 19th century, towns like Manaus Brazil became the opulent heart of the rubber trade • A number of people became rich due to the trade in rubber • Rubber barons owned large pieces of land, hired armies, enslaved the natives • The Brazilian rubber market was crushed by the rapid development of the more efficient rubber plantations of Southeast Asia. • Latex was shipped to Europe but would be spoilt • Hot weather rubber cape would be sticky and in cold weather it would harden • Turpentine was discovered to be useful solvent for rubber and revived its properties
- 5. History Production • In 1815, a humble sawyer - Hancock - invented a rubber mattress and through an association with MacIntosh he produced the famous waterproof coat known as the "macintosh". • 1819 masticator was built Hancock. Here products could be made once rubber was hot • 1840 Charles goodyear was still trying to make rubber usefull by hiding it from his wife • Finally, in 1842, Hancock came into possession of vulcanized rubber produced by Goodyear, seeking and finding the secret of vulcanization that brought him a vast fortune.
- 6. History Europe and Asia • in 1876, an English planter, Henry Wickham, collected 70,000 seeds and shipped them to England. • About 2800 seeds germinated • In 1895, Henry Ridley, head of Singapore's botanical garden, persuaded two coffee growers to plant two acres (.8 ha) of Hevea trees. • Twelve years later more than 300,000 ha of rubber grew in plantations in Ceylon and Malaya. • New innovations increased efficiency, and production doubled every two years. • Rubber could be produced at only a fraction of the cost of collecting wild rubber in Brazil. • By 1910, Brazilian production had fallen 50 percent. In 1914, Brazil's market share was down to around 30 percent, in 1918, to 20 percent, and in 1940 to 1.3 percent.
- 7. Production Cont … • In 1845, R.W. Thomson invented the pneumatic tire, the inner tube and even the textured tread. • In 1850 rubber toys were being made, as well as solid and hollow balls for golf and tennis. • The invention of the velocípede by Michaux in 1869 led to the invention of solid rubber, followed by hollow rubber and finally the re-invention of the tire, because Thomson's invention had been forgotten. • Finally, Bouchardt discovered how to polymerize isoprene between 1879 and 1882, obtaining products with properties similar to rubber. • The first bicycle tire dates back to 1830, and in 1895 Michelin had the daring idea of adapting the tire to the automobile. Since then, rubber has held an outstanding position on the global market.
- 8. Rubber and World War • However the Second World War threatened to shift the rubber wealth with Japan occupying prime rubber-producing areas in Southeast Asia. • The U.S. feared it would run out of the vital material. • The Rubber Development Corporation, the chief overseer of rubber acquisition, sought out other sources including establishing a rubber program. • The ultimate goal of the program was to establish rubber plantations close to home. • Extensive work on synthetic rubber yielded a product that, in time, economists predicted, would replace natural rubber. • By 1964 synthetic rubber made up 75 percent of the market.
- 9. Rubber as an engineering material • To be useful as an engineering material there is need to undergo a curing stage known as Vulcanisation • This requires a crosslinking agents and accelerants • Vulcanisation leads to the creation of crosslinks in-between molecules • The rubber obtains unique properties after this stage • During vulcanization other fillers can be added that assist with the processing of rubber
- 10. Rubber .... • Saturated an unsaturated • Natural and synthetic • Polar and non-polar • Crystallizing and non-crystallizing • Rubbers for general use – they have properties complying with requirements of more products, often also with different properties, they are relatively cheap, produced and consumed in big volume • Special rubbers – except of basic elastic properties they have at least one special property, e.g. ageing resistance, resistance against chemicals, resistance against swelling in non-polar oils, resistance against high or low temperatures. Normally they are produced and consumed in lower volume than general rubbers and they are significantly more expensive.
- 11. NAMING OF RUBBER • In professional literature and also in practice the rubbers are named besides commercial names also with abbreviations (in accordance with ASTM-D 1418-76 or ISO-R 1629). • Basis for the abbreviation creating is the rubber chemical composition. • The last letter of appropriate abbreviation characterizes typical atom or group that is present in the rubber macromolecule. • Other letters of the abbreviation characterize monomers, the rubber was produced from.
- 12. NAMING OF RUBBER • M – rubbers with saturated hydrocarbon chain of methylene type • N – rubbers containing nitrogen in polymer chain • O – rubbers containing oxygen in polymer chain • Q – rubbers containing oxygen and silicium in polymer chain • R – rubbers with unsaturated hydrocarbon polymer chain (diene) • T – rubbers containing sulfur in polymer chain • U – rubbers containing carbon, oxygen and nitrogen in polymer chain • Z – rubbers containing phosphor a nitrogen in polymer chain
- 13. NAMING OF RUBBER • SBR abbreviation means butadiene-styrene rubber • CR is chloroprene rubber • EPM is ethylene-propylene rubber • EPDM is ethylene propylene diene monomer rubber • BR is butadiene rubber • OE-SBR is oil extended styrene-butadiene rubber • L-SBR means styrene-butadiene rubber produced by polymerization in solution • H-NBR is hydrogenated acrylonitrile-butadiene rubber • CIIR is chlorinated isobutene-isoprene rubber • Natural rubber is marked with abbreviation NR
- 15. PRODUCTS
- 16. RUBBER PRODUCTS • RAIL INDUSTRY • ROLLING STOCK PARTS • VACUUM BRAKE HOSE • ROLLING RINGS • JOINT RINGS • NECK RINGS • VACUUM WASHERS • PISTON ROD SEALS • DIAPHRAGMS • GENERAL EXTRUSIONS • WINDOW RUBBERS (BUS) • NITRILE CORDS • GASKET SECTIONS • AUTOCLAVE SEALS • HANAU GASKETS MINING • HOSES • MINING HOSE • SUCTION HOSE • DELIVERY HOSE • PRESSURE HOSE MOULDINGS • DONUTS • DIAPHRAGMS • SPONGE RUBBER • WHEELBARROW TYRES • PUMP COUPLINGS • IDLER WHEELS • BEARING PADS INDUSTRIAL • HOSES • BREDEL PUMP HOSE • FUEL LINE HOSES • AIR LINE HOSES • RADIATOR HOSE MOULDINGS • TROLLEY WHEELS • GLASS CONES • TANK MOUNTINGS • STUDDED MATS • GASKET SEALS • RUBBER BUSHES AGRICULTURE • HOSES • STEAM/ TOBACCO HOSE • GARDEN HOSE • JET GARDEN HOSE • BRAIDED GARDEN HOSE MOULDINGS • LIP SEALS • O RINGS • OSTRITCH MATS • IRRIGATION SEALS • SHEETING • CHEMCURE • INSERTION RUBBER