Basic Knowledge of Mixed Silicone Rubber
Mixed silicone rubber( aka Methyl vinyl silicone rubber compound) is a kind of synthetic rubber with excellent comprehensive performance, such as excellent thermal stability, high and low-temperature resistance, long-term working at -60℃ ~ +250℃, ozone resistance, good weather resistance, good electrical properties, corona resistance, arc resistance, spark resistance, and good chemical stability, Weather resistance, radiation resistance, physiological inertness, good air permeability. It can be widely used in aviation, cables, electronics, electrical appliances…
1. Production process
The mixed silicone rubber is made by adding white carbon black, silicone oil, etc., to Methyl vinyl silicone rubber. The process requires high quality and is a combination of liquid silica gel and plastic. Its products have good thermal stability, cold resistance, and excellent electrical insulation properties, and will not produce toxic substances when burned.
And the film processed by calendering has obvious differences in physical and mechanical properties in the longitudinal and transverse directions. This phenomenon is the calendering effect. Specifically, the longitudinal tensile strength of the film is greater than the transverse direction, the transverse tensile elongation of the film is greater than the longitudinal direction, and the longitudinal shrinkage rate of the film is greater than the transverse direction.
2. The calendering effect
The calendering effect means that during the calendering process of polymer materials, the thermoplastic will be subjected to a large shear force when passing through the calendering roller gap, so the polymer macromolecules will be aligned along the calendering direction, so that the resulting film exhibits anisotropy in physical and mechanical properties.
The calendering effect is related to the composition of the rubber compound, calendering temperature, speed, speed ratio and so on.
3. Classification and application
Silicone rubber compounds are mainly divided into molded rubber and extruded rubber. They have excellent physical properties and high and low-temperature resistance, and are suitable for the production of various color-added silicone products.
Ordinary molded rubber can be vulcanized with 2,5-Bis(tert-butylperoxy)-2,5-dimethylhexane agent, which is used to produce various kinds of general industrial miscellaneous parts such as silicone gifts, auto parts, remote control buttons, and sealing rings.
Ordinary extruded rubber can be vulcanized with 2,4-Dichlorobenzoyl peroxide agent to produce various types of wires, cables, silicone rubber hoses, rubber strips and other products with no length and size restrictions.
For any inquiries, please feel free to contact Elena (E-mail: elena@kmtindustrial.com)
