Rubber is divided into natural rubber and synthetic rub […]
Rubber is divided into natural rubber and synthetic rubber. Natural rubber is mainly derived from Hevea brasiliensis. When the skin of this rubber tree is cut, milky white juice will flow out, which is called latex. The latex is coagulated, washed, formed and dried to obtain natural rubber. Synthetic rubbers are made by synthetic methods. Different materials (monomers) can be used to synthesize different types of rubber. Chemist C.D. from 1900 to 1910
Tyres and general industrial rubber products. General rubber has a large demand and is the main product of synthetic rubber. Rubber shoes and so on. The shortcomings of butadiene rubber are that the tear resistance performance is poor and the wet skid resistance is not good.
Harris determined that the structure of natural rubber is a polymer of isoprene, which opens the way for synthetic rubber. In 1910, the Russian chemist SV Lebedev (1874-1934) polymerized 1,3-butadiene into sodium butyrate rubber with sodium metal as the initiator. Later, many new synthetic rubber varieties appeared successively. Rubber part, neoprene rubber, styrene-butadiene rubber, etc. The output of synthetic rubber has greatly exceeded that of natural rubber, of which the largest production is styrene butadiene rubber.
Rubber hoses, gaskets, and chemically resistant equipment linings. The general structure of vulcanized rubber. Because of its large molecular weight, it is finely lumps without external force. When the external force acts, withdrawing the external force, the degree of entanglement of the fine cluster changes, and the molecular chain rebounds, resulting in a strong tendency to restore. This is the origin of rubber's high elasticity.
Oil resistance and styrene butadiene rubber are close. Ethylene-propylene rubber has a wide range of uses. It can be used as tire sidewalls, rubber strips and inner tubes, as well as parts for automobiles. It can also be used for wire and cable sheathing and high-voltage, ultra-high-voltage insulation materials. Can also manufacture rubber shoes, hygiene products and other light-colored products.