Rubber stocks: In the night trading, focus on the retracement near 14540. For defense, refer to the 14480 line. The target is 14600/14680, and the band is 14810.
Rubber refers to a highly elastic polymer material with reversible deformation. It is elastic at room temperature, can produce large deformation under the action of a small external force, and can return to its original shape after the external force is removed. Rubber is a completely amorphous polymer with a low glass transition temperature (T g) and a molecular weight that is often large, greater than hundreds of thousands. Rubber stocks: In the night trading, focus on the retracement near 14540. For defense, refer to the 14480 line. The target is 14600/14680 and the band is 14810.
Rubber is divided into two types: natural rubber and synthetic rubber. Natural rubber is made by extracting gum from rubber trees, rubber grass and other plants; synthetic rubber is obtained by polymerization of various monomers. Rubber products are widely used in various aspects of industry or life.
1. Chemical composition, performance characteristics and main uses of common rubber:
1) Natural rubber (NR): mainly rubber hydrocarbon (polyisoprene), containing A small amount of protein, moisture, resin acid, sugar and inorganic salts, etc. It has high elasticity, high tensile strength, excellent tear resistance and electrical insulation, good wear resistance and drought resistance, good processability, easy to bond with other materials, and is better than most synthetic rubbers in terms of overall performance. Especially suitable for manufacturing torsional vibration eliminators, engine shock absorbers, machine supports, rubber-metal suspension components, diaphragms, and molded products.
2. Styrene-butadiene rubber (SBR): a polymer of butadiene and styrene. Its performance is close to that of natural rubber, and it is currently the most widely produced general-purpose synthetic rubber. Its characteristics are that its wear resistance, aging resistance and heat resistance exceed those of natural rubber, and its texture is more uniform than natural rubber. The disadvantages are: low elasticity, poor flexing resistance and tear resistance; poor processing performance, especially poor self-adhesion and low raw rubber strength. It is mainly used to replace natural rubber in the production of tires, rubber sheets, rubber hoses, rubber shoes and other general products.
3. Butadiene rubber (BR): It is a cis-structured rubber polymerized from butadiene. The advantages are: excellent elasticity and wear resistance, good aging resistance, excellent low temperature resistance, low heat generation under dynamic load, and easy metal bonding. The disadvantages are lower strength, poor tear resistance, poor processing performance and self-adhesiveness. Operating temperature range: about -60℃~+100℃. It is generally used together with natural rubber or styrene-butadiene rubber, and is mainly used to make tire treads, conveyor belts and special cold-resistant products.