Usually, what we call natural rubber refers to the natu […]
Usually, what we call natural rubber refers to the natural rubber latex collected from the rubber tree, which is a solid product made by coagulation, drying and other processing procedures. Natural rubber is a natural polymer compound with polyisoprene as the main component. Its molecular formula is (C5H8)n. Its rubber hydrocarbon (polyisoprene) content is more than 90%, and it also contains a small amount of protein and fatty acid. , sugar and ash, etc.
Physical properties of natural rubber. Natural rubber has high elasticity at room temperature, is slightly plastic, has very good mechanical strength, low hysteresis loss, and low heat generation during multiple deformations, so its flexural resistance is also very good, and because it is non-polar. Rubber, so the electrical insulation performance is good.
Rubber, together with plastic and fiber, is known as the three major synthetic materials, and is the only polymer material with high stretchability and excellent elasticity. The biggest characteristic of rubber is firstly that the elastic modulus is very small, and the elongation is very high. The second is that it has quite good air permeability and resistance to various chemical media and electrical insulation. Some special synthetic rubbers have good oil resistance and temperature resistance, and can resist the swelling of fatty oil, lubricating oil, hydraulic oil, fuel oil and solvent oil; the cold resistance can be as low as -60℃ to -80℃, and the heat resistance can be Up to +180°C to +350°C. Rubber is also resistant to various flexural and bending deformations because of low hysteresis loss. The third characteristic of rubber is that it can be used, blended and compounded with a variety of materials, thereby being modified to obtain good comprehensive properties.