Properties and uses of natural rubber
🕙 2023-09-01 👆
The glass transition temperature of natural rubber is -72℃, the glue flow temperature is 130℃, the initial decomposition temperature is 200℃, and the intense decomposition temperature is 270℃. When natural rubber is vulcanized, its Tg rises and viscous flow no longer occurs. Dongguan silicone products
The elasticity of natural rubber is high in raw rubber and vulcanized rubber with low crosslinking density. For example, in the range of 0-100 ° C, the resilience is between 50-85 ° C, its elastic modulus is only 1/3000 of steel, the elongation can reach 1000%, stretching to 350%, after the shrinkage permanent deformation is only 15%, the elasticity of natural rubber is higher, second only to butadiene rubber in general rubber.
The electrical properties of natural rubber Natural rubber is a non-polar substance and is a good edge material. When the natural rubber is vulcanized, due to the introduction of polar factors, such as sulfur, accelerators, etc., so that the edge performance is reduced.
Natural rubber is a non-polar substance that dissolves in non-polar solvents and non-polar oils. Natural rubber is not resistant to cyclohexane, gasoline, benzene and other media, unvulcanized rubber can dissolve in the above medium, vulcanized rubber is swollen. Natural rubber is insoluble in polar acetone, ethanol, more insoluble in water, resistant to 10% hydrofluoric acid, 20% hydrochloric acid, 30% sulfuric acid, 50% sodium hydroxide and so on.
The strength of natural rubber In elastic materials, the strength of raw rubber, mixed rubber, vulcanized rubber is relatively high. The tensile strength of unvulcanized rubber is called Green strength, and the Green strength of natural rubber can reach 1.4 ~ 2.5Mpa, and the appropriate Green strength is necessary for rubber processing and molding. The tear strength of natural rubber is also high, up to 98kN/m, and its wear resistance is also good. The reason for the high mechanical strength of natural rubber is that it is self-reinforcing rubber, and when stretched, the macromolecular chain forms crystallization along the stress direction. Dongguan silicone rubber products
Natural rubber is widely used in industry, agriculture, national defense, transportation, machinery manufacturing, medical and health fields and daily life, such as transportation tires, because of its strong elasticity and good edge, plasticity, water and air insulation, tensile and wear-resistant characteristics; Industrial transport belt, transmission belt, various sealing rings; Medical gloves and blood transfusion tubes; Rubber shoes, raincoats, hot water bags and so on used in daily life are made of rubber as the main raw materials, and aircraft, cannons, tanks used in national defense, and even rockets, satellites, spacecraft, and space shuttles in the field of cutting-edge science and technology need a large number of rubber parts.
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