Knowledge of nature rubber

[sunnye]

Natural rubber glue the glass temperatures of -72 ℃, plastic-temperature 130 ℃, the temperature started to decompose 200 ℃, intense decomposition temperature of 270 ℃. When natural rubber vulcanization, increased its Tg, viscous flow will not happen again.

The flexibility of its natural rubber and rubber Health crosslinking density is not too high a vulcanizate of flexibility is high. For example, in the 0 -100 ℃ within the framework of elasticity in the 50 -85 ℃, and its elastic modulus of only 1 / 3000, elongation of up to 1,000 percent, stretching to 350%, after the retractable permanent Deformation only 15 percent, the flexibility of higher natural rubber, rubber in the second only to GM in the butadiene rubber.

The strength of natural rubber in the elastic material, natural rubber Health and plastic, mix, the strength of vulcanized rubber relatively high. Vulcanized rubber is not known as the tensile strength of Green's strength, natural rubber Green's strength up to 1.4 ~ 2.5Mpa, the appropriate strength of the Green molding rubber processing is necessary. Natural rubber tear strength is also higher, up to 98 kN / m, its wear resistance is better. Natural rubber for the high mechanical strength is that it is self-reinforced rubber, when the time will macromolecules chain stretching along the direction of stress formation of crystal orientation.

The electrical properties of natural rubber natural rubber non-polar material, is a good insulating material. When natural rubber vulcanization, due to the introduction of polar factors, such as sulfur and promoting agent, so that insulation performance decline.

Natural rubber medium-resistant properties of natural rubber is a non-polar material, it dissolved in non-polar and non-polar solvent oil. Intolerance cyclohexane natural rubber, [Only registered users see links. ], benzene and other media, not vulcanizate in the medium of dissolution, vulcanized rubber is swelling. Natural rubber do not dissolve in the polar acetone, alcohol, the more insoluble in water, 10 percent of the hydrofluoric acid-resistant, 20 percent of hydrochloric acid, 30 percent of the sulfuric acid, sodium hydroxide, such as 50% of.
Natural rubber because of a strong flexibility and good insulation, plastic, Geshui separated from gas, tensile and wear-resistant characteristics, widely used in industry, agriculture, defense, transportation, transport, machinery manufacturing, medical and health fields , And other aspects of daily life, such as transport, with the tire; industry with the transport belt, belts, all kinds of seals; medical gloves, the loser vascular; used in the daily life of the shoes, raincoats, and so are Nuanshui Dai Rubber as the main raw materials to manufacturing, national defense, the use of the aircraft, artillery, tanks, or even cutting-edge technology in the field of rockets, satellites, spacecraft, space shuttle and so requires a large amount of rubber parts.