Fluorosilicone rubber from wonepart
Fluorosilicone rubber is a kind of hot-vulcanized special silicone rubber. Because its matrix polymer is silicone rubber containing trifluoropropyl group, it combines the advantages of silicone rubber and fluorine rubber: that is, it has good low temperature performance and insulation of silicone rubber. Performance, high temperature performance, easy processing and weather resistance, but also has low permeability, flame retardancy, good physical and mechanical properties and chemical stability similar to fluororubber, such as solvent resistance, oil resistance, oil and gas resistance, and suitable for various It is widely used in the fields of aviation industry, petroleum industry, automobile industry, chemical industry, etc. because of the harsh high and low temperature resistance fuel and lubricant resistance occasions. As a kind of sealing protection products, fluorosilicone rubber is suitable for use in aerospace, automobile, electromechanical, electronic, machinery and construction fields. It can be used in kerosene and steam at -55℃～220℃ and open flame at 150℃. And continue to use in harsh environments such as stress, temperature resistance, oil resistance, and ozone resistance when the strength is greater than 100KG. Below, the characteristics of our fluorosilicone rubber are introduced in detail.
Important characteristics of fluorosilicone rubber
1. Weather resistance, oil resistance, solvent resistance, and chemical resistance
The main chain of fluorosilicone rubber is a Si-O bond structure, which is a saturated chain, so it has excellent air aging resistance. Its rubber test piece can still maintain good elasticity after five years of outdoor exposure test; after up to 10 years, Under ultraviolet light and harsh weather conditions, its physical properties have only minor changes. The tensile strength and elongation at break of samples placed in different locations have decreased by less than 25%.
Compared with methyl vinyl silicone rubber, fluorosilicone rubber has excellent oil resistance, solvent resistance, and chemical resistance; even when compared with fluororubber, it has good oil and solvent resistance. After immersing in the same medium, temperature and time, it shows excellent durability. Fluorosilicone rubber has better resistance to methanol-containing gasoline. Even in a gasoline/methanol mixture, the hardness, tensile strength, and volume change of the vulcanized rubber are very small. After a long-term immersion test for 500 hours, the physical properties are also almost no change at all.
2. Heat resistance
Compared with fluororubber, fluorosilicone rubber has excellent heat aging resistance, especially the retention rate of physical properties at high temperature.
Compared with silicone rubber, fluorosilicone rubber reduces the heat resistance of fluorosilicone rubber to a certain extent due to the presence of trifluoropropyl group. The reason is that trifluoropropyl group is easily thermally decomposed, and the decomposition produces highly acidic compounds that accelerate fluorine. Thermal aging reaction of silicone rubber. The high temperature decomposition of fluorosilicone rubber is the same as that of silicone rubber, namely: side chain oxidation, main chain rupture, side chain thermal decomposition and various compound reactions. Since the decomposition products can also cause the main chain to break, the heat resistance is usually worse than that of silicone rubber, and it has begun to oxidize and age at a temperature of 200°C. Temperature has greater influence on fluorosilicone rubber than silicone rubber, but less than fluoroelastomer. Foreign countries have also studied the service life of fluorosilicone rubber at 150℃×2000h, 175℃×5000h, and 200℃×4000h. The result is second only to methyl vinyl silicone rubber.
3. Low temperature performance
Like ordinary silicone rubber, fluorosilicone rubber has good low temperature performance. Since fluorosilicone rubber is a linear polymer composed of soft Si-O as the main chain, its low temperature characteristics are better than those of fluoroelastomers with C-C as the main chain. First of all, the molecular backbone of fluorosilicone rubber is relatively flexible, giving it excellent cold resistance. Secondly, the molecular chain of fluorosilicone rubber is in a helical configuration. The flexibility of the molecular chain is greater than that of the CC bond or the Si-C bond. The interaction force between the molecular chains is weak. These structural features make it soft and elastic. When it changes, the intermolecular force changes very little, so its various properties, especially elasticity, change little, making it have low-temperature performance that other rubbers can’t match. Third, the presence of trifluoropropyl substituted methyl can destroy the regularity of the polydimethylsiloxane molecular chain, reduce the crystallization temperature and degree of crystallization of the polymer, and make fluorosilicone rubber have a better low temperature than silicone rubber Sex. Therefore, fluorosilicone rubber still has elasticity at a low temperature of -60°C to -70°C, and can be used for a long time at -60°C.
4. Electrical insulation and radiation resistance
The electrical performance of fluorosilicone rubber is similar to that of ordinary silicone rubber. Except for high frequency and high voltage electrical environment, its electrical insulation performance can reach the use level. The electrical insulation performance changes little under severe conditions such as high temperature, low temperature, humidity, oil, solvent, chemicals, ozone, etc. The radiation resistance of fluorosilicone rubber is not outstanding, but the radiation aging resistance is better than that of methyl vinyl silicone rubber.
5. Physical and mechanical properties
Like ordinary silicone rubber, fluorosilicone rubber has relatively low mechanical strength (especially tear strength).
Our company can customize and process fluorine-silicon special-shaped parts, O-rings, gaskets, gaskets, oil seals, etc. according to requirements. After customer experiments, the effect is excellent. Welcome customers in related industries to exchange and consult, and request samples for testing.
