Natural rubber is obtained from the sap of rubber trees, which include: Hevea, some varieties of figs, lzhesmakovnitsa, landolifiya, some types of trees apotsinovyh.
taken at the beginning of sap, which is more similar to milk.This is done with the help of deep cuts in the trunk, insert into the slit of the trough and hopper for collection of fluid in the small-capacity bowl.On average, a single tree can produce from 12 to 15 liters per year rubber juice.Such trees are native to Asia and South America.
After collect the juice, which must be drained daily from the bowls (or he will fall asleep), it is poured into molds and allowed to cool.Natural rubber is a kind of colorless hydrocarbon or the same white solid.
then harvested still plastic juice transported to plants for the produc
tion of latex and rubber, where he serves as the main component for the manufacture of rubber.This rubber gives it flexibility.
With the development of the natural rubber industry was not enough, as the greatly increased production and use of rubber products, so that was invented synthetic rubber, yet it is called synthetic.
This type of rubber made from petroleum chemical plants using boiling separators.For rubber, which is not inferior to the natural one in terms of quality, the separated pulp is subjected to heat treatment.
synthetic rubber consists of short hydrocarbon chains.According to its properties, it is not inferior to the natural one, and in some ways even surpasses it.
One of the pioneers was the Russian synthetic rubber, as the rest of the industrialized countries for many years received plastic sap of its colonies, not worrying too much about finding synthetic analogs.The first synthesized rubber, based on the reaction of butadiene and ethanol was obtained Soviet chemist SV Lebedev in 1927, and in 1932 the Soviet Union began the industrial production of synthetic rubber.Currently produced many kinds of synthetic rubber, which include the following:
Recently, environmental activists from Greenpeace advocate a complete rejection of the use of natural rubber as well as collecting the juice for its production harms the trees.The rubber in the pure form is almost never used due to their imperfect qualities, namely heating at more than 45 degrees it becomes tacky and at a temperature of from 0 to minus 10 degrees becomes brittle.