L34RESINS AND POLYMERS PART4 RUBBER RESINS

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RUBBER RESINS • Natural rubber, chlorinated rubber, poly-chloroprene (neoprene), cyclized rubber, styrene-butadiene rubber, high styrene butadiene, acrylonitrile butadiene rubber (NBR). • DEFICIENCIES OF NR • • Hard and brittle at low temp. but soft and sticky at high temp. • • It undergoes air oxidation and develops bad odour and colour • • Insoluble in water, dil. acids and alkalies. Soluble in many organic solvents (benzene, chloroform, ether, petrol, carbon disulphide etc. ). • • Natural rubber is hygroscopic in nature. • • Low chemical resistance towards chemicals like acids, bases, oxidising and reducing agents. • • It has low tensile strength, wear and tear resistance. • • One of the biggest limitations of natural rubber is its poor resistance to hydrocarbons, fats, oils, and greases. Contact with these substances can cause swelling, softening, or complete dissolution of the rubber part resulting in partial or complete failure. • • have poor heat resistance and are susceptible to attack by ozone due to the presence of double bonds in the polymer backbone that are prone to thermal and oxidative degradation. • APPLICATIONS • tyres, springs, bearings, rubber bands, and adhesives. • In view of the above deficiencies the synthetic rubbers are manufactured and used in coatings and other products. • CHLORINATED RUBBER • • An odorless, pale yellow resin prepared by adding up to 65% chlorine to an elastomer, such as natural rubber, butyl rubber, or styrene-butadiene. • • Chlorinated rubber is used in air drying resistance to acid alkali water salts etc softened by vegetable oils • • Thermoplastic affected by solvent • • Chlorinated rubber is compatible with various resins plasticizer has good adhesion on various substrates. • • High molecular POLYMER - greater Cohesive force -POOR ADHESION LOW GLOSS-RESIN ADDED • • Decomposition can be due to traces of HCl, UV, heat., stabilized with lead carbonate • • Chlorinated rubber produces a hard tough, glossy film. • CHLORINATED RUBBER PROPERTIES • Good in weather-fastness, water-fastness, insulation, non-inflammability-fire retardant coatings, chemical resistance, acid resistance, alkali resistance, anticorrosion, mould proof, increasing the adhesiveness and shock strength of the coatings. • APPLICATION OF CHLORINATED RUBBER • • Coating for garage floors, pumps and other metal works, fire retardant paint, traffic paint • • used primarily in paints, varnishes, adhesives, inks and paper coatings. • • Chlorinated rubber used for waterproof paints on floors and swimming pools. It is very resistant to chemicals and moisture. • Chlorinated Rubber Base Paint is suitable for application to most buildings and structural materials such as iron, steel, copper, zinc, aluminum, wood, concrete, plaster and brick. • POLY-CHLOROPRENE (NEOPRENE) • Used primarily for gaskets, cable jackets, tubing, seals, O-rings, tire-sidewalls, gasoline hoses and weather-resistant products such as wet suits and orthopedic braces. • It is also used as a base resin in adhesives, electrical insulations and coatings • CYCLIZED RUBBER • harder than rubber • Used in printing inks, heat and chemical resistant and anticorrosive paints, primer for self-adhesive tapes, mirror backing paints. • STYRENE BUTADIENE RUBBER (SBR) • Styrene butadiene rubber (SBR) is one of the cheaper synthetic general purpose elastomers -sometimes used as a substitute for natural rubber (NR). • APPLICATION of SBR • • Styrene butadiene rubber (SBR) is the highest volume general purpose synthetic rubber. It can be used in similar applications as NR. • • Typical applications include drive couplings, haul-off pads, conveyor belts, shoe soles and heels, adhesives, roll coverings and car tires (but not truck tires) and various other molded rubber goods. The typical working temperature range is -25°C to +100°C. • NBR - BUTADIENE NITRILE RUBBER • • Acrylonitrile butadiene rubber (NBR), usually shortened to nitrile rubber • • 18-42% acrylonitrile • • high acrylonitrile content have better oil and abrasion resistance, whereas low acrylonitrile content have better low temperature flexibility and resilience. • • good hydrocarbon solvent resistance, not suitable with polar solvent • NBR Application • • NBR’s are used where excellent oil resistance is required. They are widely used in sealing applications, particularly for oils and gasoline (aliphatic and aromatic hydrocarbons). • • Major applications include gaskets, seals, diaphragms, gasoline hoses, liners, tubing, O-rings and cable jacketing. • • Typical grades have a working temperature range of -25°C to +100°C. 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