What are the differences between SMR20 and synthetic rubber ?
The difference between 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…
What are other types of Synthetic rubber ?
Special space rubber – polyisoprene and polybutadiene The discovery that the Ziegler-Nata (Lithium alkyl) catalyst catalyzes the polymerization of isoprene or butadiene in such a way that the cis structure is mainly obtained made it possible to simulate natural rubber by synthesis. Polyisoprene (IR) rubber, which is quite similar to natural rubber, is even superior in some respects such as better color, more uniform quality, less odor, faster processability and mixing, better foaming and foil, excellent mold flow and controlled molecular weight. In contrast, tear strength, viscosity and tensile strength of natural rubber are higher. Polyisoprene is commercially produced and used alone or in combination with natural rubber. 1 and 4 – Polybutadiene with a high percentage of cis is soft, easily soluble. It has low waste and good abrasion resistance. On the other hand, 1 and 4-polybutadiene has a high percentage of trans, hard, crystalline and has low solubility.…
Styrene butadiene rubber appearance
Styrene butadiene rubber Origin of styrene butadiene rubber Polybutadiene was one of the first elastomers or tires you had, which is 0% of butadiene production, used to make tires and tires, and 25% to 30% of it is added as an additive to other items than mechanical mechanics. They have to improve. The annual production of this polymer in 2001 is more than 2.1 million tons, which if drugs are used, it is in the second place among tires, after SBR styrene butadiene rubber or styrene butadiene rubber. Polybutadiene was first polymerized in 1910 by a Russian scientist named Sergei Vasilyevich Lebedo Sergei Vasilyevich Lebedev. In 1926 he invented a process for the production of butadiene from ethanol, and in 1928 he was able to use sodium as a catalyst to develop the production of polybutadiene. According to this discovery, the Soviet Union was the first country to succeed in…
Production method for SBR
Emulsion method In this method, polymerization is done through free radicals, which is done in both hot and cold states. The product obtained by cold method in the presence of oil or in the presence of oil-soot has high linearity, narrow molecular distribution, high molecular weight and difficult processing. (Series 1500 (Type 1500)). The product obtained by hot method is also highly branched and has a wide molecular mass distribution, good process ability and higher 1 and 2-vinyl percentages. (Series 1000 (Type 1000)). Solution method : In this method is ionic polymerization, the product of this method has high linearity, high flexibility and high abrasion and tear resistance against dynamic stresses. Gel method : The product of this method has a weak percentage of chemical bonds during the polymerization reaction between the chains, which reduces the mobility of the chains and improves process ability. The gel is obtained in two…