Silicone Material Superiority
Silicone rubber is a very special elastomer mixed with a polysiloxane polymer, which is shared by organic and inorganic groups, and inorganic silica. This is what we call a silicone rubber. Silicone RUBBER has very good properties not found in other organic rubbers and is used in a wide variety of industries such as medical, kitchen, construction, shipbuilding, aviation, electricity, electronics, communication, machinery, automotive, painting, Silicone rubbers have superior resilience, weatherability, ultraviolet rays and heat resistance among the existing rubber used.
Definition of Silicone
1. Terminology: Silicon and Silicone
| Silicon | an element represented by Si. The material is a dark gray metal phase
(Ex. silicon wiper for semiconductors) |
|---|---|
| Silicone | It means a polymer in which the organic group-containing silicone (organodilicon) and oxygen are chemically bonded to each other. It is a unique chemical material having both organic and inorganic properties. It is applied in various forms, (A polymer formed by linking an organic group-bonded silicone with a siloxane bond [Si-O-Si]) |
2. Origin
Since the chemical formula R2SiO of the SILICONE synthesized in the late 19C laborato SILICONE
Characteristics of Silicone
| Heat resistance | The C-C bonding energy, which is the main axis of organic synthetic rubber, is 83 kcal / mol, while the Si-0 bonding energy is 108 kcal / mol. Due to 350 ℃ when used intermittently for a short time. | |
|---|---|---|
| Continuous use time of silicone rubber by temperature | Temperature (℃) | Continuous use time |
| 150 | 15,000 | |
| 200 | 7,500 | |
| 260 | 2,000 | |
| 316 | 100 | |
| 370 | 1/4-2/1 | |
| Cold resistance | The low temperature resistance of silicone rubber is the best among all kinds of rubber.
The saturation point of the general organic rubber is -20 ° C to -100 ° C |
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| Weatherability | Unlike other organic rubbers, oxygen in the atmosphere in the molecular structure. Ozone, ultraviolet rays, and so on, it has excellent weatherability because there is no double bond that causes cracks. | |
| Compression Permanent String Ratio | Compressive permanent shrinkage of general organic rubber increases remarkably with temperature, whereas elasticity and resto 250 ℃. Therefore, even if compressive deformation is required under extreme conditions Performance | |
| Oil resistance | Silicone rubber is excellent in oil resistance at high temperatures where general organic rubber except fluorine rubber can not be used. | |
| Chemical resistance
Heat-water-resistantr |
Excellent chemical resistance. It is not infringed by polar organic compounds such as alkali. However, strong acid or strong alkali may be infringed. Therefore, when it is used in connection with these, it must be decided whether or not to contact with steam. If the steam pressure is 2 kgf / ㎤, some decomposition may occur at the contact surface, but it can be improved by selecting the appropriate hardening agent and changing the hardening condition. | |
| Electrical characteristic | Silicone rubber has a unique chemical structure and low carbon content in the molecule. It does not use carbon black, which is used as filler in general organic rubber. Therefore, it has excellent resistance tor even under harsh conditions because it is widely used as an insulating material and leaves silica as an insulating material even when it is burned.
On the other hand, there are conductive silicone rubbers that have a resistance value of 5 Ω-cm or less by mixing conductive additives such as carbon. |
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| ductility | Silicone rubber does not burn easily because its molecular structure contains less hydrocarbon than conventional organic rubber. It does not contain halogen element and does not generate to the UL standard. | |
| Etc | In addition to the above characteristics, silicone rubber has many characteristics that ordinary organic rubber does not have.
It has higher thermal conductivity than conventional organic rubber and is used as insulation buffer for insulation coating and heat dissipation electrical appliances. Its permeability tors. Excellent durability against radiation. Excellent transparency and coloring. It is chemically inert and does not corrode other materials. Excellent durability. |
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