Difference between SBR and
NATURAL RUBBER AND SYNTHETIC RUBBER
In 1839, an American inventor named Charles Goodyear developed a method to improve the properties of natural rubber, making it stronger and more usable. He called this process the vulcanization or boiling of oxygen in rubber and metals. This process revolutionized the rubber industry. Natural rubber is an elastomer (elastic hydrocarbon polymer) made from raw rubber, a milk colloid obtained from most plants. Elastomer is a material that can withstand more elastic deformation than other materials under stress and return to its original size without any deformation. The commercial source of natural rubber is a native Brazilian plant called Hoya brazilensis, which belongs to the Euphorbia family. Some other plants from which natural rubber can be obtained are: gutta-percha, rubber-shaped, Panamanian rubber tree, common dandelion and Russian dandelion. Natural rubber was used commercially until the twentieth century. Natural rubber has occupied an important position in the market due to its many applications. Some of its uses include making tires for use in race cars, trucks, buses and airplanes.
Synthetic rubbers in chemical plants are obtained by polymerizing monomers into polymers. They are produced artificially. Some of the most important synthetic rubbers are: butadiene, strain-butadiene, neoprene / polychloroprene, polysulfide, nitrile, butyl and silicone rubbers.
They have many applications and different chemical and mechanical properties. Many synthetic tires have expanded throughout the twentieth century. Some of them are used instead of natural rubber because of their properties. Their special applications include electrical transformers, wet clothes, laptop sides, orthopedic kits, electrical insulation, car fan straps, car tires, shoe soles, pencil erasers, birth balloons, adhesives, protective gloves, conveyor belts, flexible toys, Pipes, mattresses, rubber ropes, paint, hoses, gaskets and floor tiles.
DIFFERENCES IN THE PRODUCTION OF SYNTHETIC RUBBER AND NATURAL RUBBER
Synthetic rubbers are obtained by polymerizing various petrochemicals known as monomers. Some examples are: Sterin butadiene rubber (SBR) obtained by cross-polymerization of strain and butadiene, Butyl rubber (IIR) which is a synthetic rubber obtained by polymerization of isobutylene with isoprene, NB nitrile rubber Which is an oil-resistant synthetic rubber obtained from the polymerization of alkyl nitrile and butadiene, and neoprene produced by chloroprene polymerization.
Natural rubber is obtained from raw rubber, which is drawn mostly from the sap of Hoya brasiliensis. An incision is made in the bark of the tree and the raw rubber is collected in a cup or pot, then filtered, washed and allowed to react with an acid to freeze the rubber particles and form a mass. The rubber is then compressed into molds and dried. It then goes to the next stages of production in the industry to be reformed.
DIFFERENCES IN THE PROPERTIES OF SYNTHETIC RUBBER AND NATURAL RUBBER
Synthetic rubbers are more resistant to oil, oil, specific chemicals and oxygen, have better life and weather characteristics, and have good flexibility over a wide temperature range. Natural tires have good wear resistance, high elasticity, high flexibility and good tensile strength. It has good dynamic performance and low damping level. But over time, it ages and has poor chemical, oily, and ozone resistance. As the temperature increases, its resistance decreases.
AGING PROPERTIES, LOW TEMPERATURE FLEXIBILITY AND ABRASION RESISTANCE
Butadiene strain is one of the cheap and general-purpose synthetic rubbers that has less physical strength, flexibility and low temperature properties. But its aging properties and abrasion resistance are better than other natural tires. Unlike natural rubber, this material hardens over time instead of softening. Natural tires have good physical strength, flexibility and low temperature properties, but have low wear resistance and aging properties compared to butadiene strain. Its low temperature properties are lower compared to nitrile.
OIL RESISTANCE AND FLEXIBILITY
Nitrile has oil and oil resistance, low temperature flexibility, abrasion resistance and better flexibility than natural rubber. It also has lower gas permeability. Natural rubber has lower oil and oil resistance and flexibility than nitrile. But it has better physical strength.
OZONE RESISTANCE, CHEMICAL AND ELECTRICAL
Ethylene propylene monomer (EPDM), neoprene / polychloroprene and some other synthetic rubbers have excellent heat resistance, oil and oil resistance, ozone and weather resistance, and polar flow resistance, as well as better aging and chemical resistance. In addition, their physical properties and low temperature resistance are good. It also has low flammability and gas permeability. EPDM can be combined with other compounds to achieve excellent electrical resistance. Natural rubber has low resistance to ozone, polar flux and chemicals. It swells and weakens with hydrocarbon oils and weakens with oxygen and ozone as it ages.
ELECTRICAL PROPERTIES
Ozone tires have excellent electrical properties and high resistance to weather and ozone attack. Their physical properties are maintained at high temperatures. They are more expensive than other tires. Natural tires have poor electrical properties and low resistance to weather and ozone depletion. They have better physical properties. Natural rubber has an important place in the market due to its applications. But synthetic rubber is often used instead of natural rubber, especially when it improves the properties of the materials needed.