Main uses of natural rubber Handwheels:Natural rubber handwheels are widely used in industry,agriculture,national defense,transportation because of their strong elasticity and good insulation,plasticity,water and gas insulation,tensile strength and wear resistance.,transportation,machinery manufacturing,medical and health fields and daily life,such as tires used in transportation;industrial conveyor belts,transmission belts,various sealing rings;medical gloves,blood vessels;rubber shoes used in daily life,raincoats,warm water bags,etc.are all made of rubber handwheels.Aircraft,cannons,tanks used in national defense,and even rockets,artificial satellites,spacecraft,and space shuttles in the field of advanced technology require a lot of Rubber Handwheel parts.
The elasticity of natural rubber handwheels and Handles is high in raw rubber and vulcanized rubber with low cross-linking density.For example,in the range of 0-100°C,the resilience is between 50-85°C,the elastic modulus is only 1/3000 of that of steel,the elongation rate can reach 1000%,stretched to 350%,and then retracted permanently The deformation is only 15%,and the elasticity of the natural rubber handwheel is high,which is second only to the butadiene rubber handwheel among the general-purpose rubber handwheels.
The strength of natural rubber handwheel and handle is among the elastic materials,and the strength of raw rubber,compound rubber and vulcanized rubber of natural rubber handwheel is relatively high.The tensile strength of the unvulcanized rubber handwheel is called the Green strength.The Green strength of the natural rubber handwheel can reach 1.4 to 2.5Mpa.Appropriate Green strength is necessary for the processing and molding of the rubber handwheel.The tear strength of natural rubber handwheels is also high,up to 98kN/m,and its wear resistance is also good.The reason for the high mechanical strength of the natural rubber handwheel is that it is a self-reinforcing rubber handwheel,and when stretched,the macromolecular chain will be oriented along the stress direction to form crystals.
The electrical properties of natural rubber handwheels and handles,natural rubber handwheels are non-polar substances and are a good insulating material.When the natural rubber handwheel is vulcanized,the insulation performance is reduced due to the introduction of polar factors,such as sulfur,accelerators,etc.
The medium resistance of natural rubber handwheels and handles,natural rubber handwheels are a non-polar substance,which dissolves in non-polar solvents and non-polar oils.Natural rubber handwheels are not resistant to cyclohexane,gasoline,benzene and other media.Unvulcanized rubber can dissolve in the above media,while vulcanized rubber handwheels swell.The natural rubber handwheel is insoluble in polar acetone and ethanol,more insoluble in water,and resistant to 10%hydrofluoric acid,20%hydrochloric acid,30%sulfuric acid,50%sodium hydroxide,etc.
The glass transition temperature of the natural rubber handwheel and handle raw rubber is-72°C,the temperature of the rubber flow is 130°C,the starting temperature of decomposition is 200°C,and the temperature of violent decomposition is 270°C.When the natural rubber handwheel is vulcanized,its Tg increases,and viscous flow does not occur again.
