All types of rubber, natural and synthetic, are high-molecular compounds. All types of rubber, natural and synthetic, are high-molecular compounds. The natural rubber is obtained from the Milky SAP (LTeX). The synthetic rubber is obtained from simple organic compounds (monomers) by Polycondensation or polymerisation. Therefore, these are divided into polymerization and Polycondensation rubbers. Ian Hawksworth has many thoughts on the issue. Main types of synthetic rubber, produced at the operation scale: isoprene – butadiene, butadiene – styrene, methyl styrene – butadiene, ACCS-, butadiene Methylvinylpyridin-, butadiene nitrile – Chloroprene -, butyl -, ethylene – propylene, fluorocarbon and others are preparations of Polycondensation serve (isoprene, butadiene, Chloroprene and Piperylen) and ethylene derivatives (isobutene, acrylonitrile, styrene, methyl styrene).
Output materials for monomer synthesis are oil and natural gas, coal, limestone, ethyl alcohol, etc. Silicone rubber and urethane rubber produced by the Polycondensation. For this synthesis Organosilikonverbindungen (Makrodiol, Diisozyanat u.a) used. All rubber grades are divided into saturated and unsaturated. Unsaturated rubbers are obtained from service by the Polycondensation or Kopolymerisation with ethylene derivatives. Saturated rubbers differ considerably from unsaturated in the structure, properties and curing characteristics. On properties and applications of different rubbers of the General and special provisions. For determining total natural rubber, butadiene styrene – butadiene and isoprene rubber refer.
They are used in the automobile industry (tires) and for the production of technical rubber parts. Rubbers of special designation used for the manufacture of goods, what special features have (oil, and heat resistance and high gas tightness). These are butadiene – nitrile, polysulfide, silicone rubber, butadiene-Methylvinylpyridin, Chloroprene – and butyl rubbers and fluorine-containing Kutschucke. Vulcanization of rubber is the most important process in the manufacture of rubber Vulcanization is the conversion of rubber in the elastic rubber by macromolecule networking with the cross binding. When vulcanization sulfur vulcanization accelerators, activators, weights, plasticizers and uses antioxidants, which contributes to the extraction of the vulcanizates with required properties. Usually, the curing with the Schawefel is performed. This process, called hot vulcanization, rubber compounds are heated up to 130-160 C. The vulcanization with sulfur perchloric, which is located beneath the room – or a little higher temperature, is called cold curing. Hot vulcanisation plays an important role, because she win allows the manufacture of goods with value properties. Some rubber grades can cure themselves at high temperatures (100-200?) without sulphur. For vulcanization of rubber of special provision, metal oxides, peroxides, polysulfides, halogenated derivatives, isocyanates and diamine used as Vulkanisationsmittel. g-rubber.com/de/catalog/natural-rubber.html