The main chain of fluorosilicone rubber is a -Si-O- bond structure. After polar fluorine atoms (such as trifluoropropyl) are introduced into the side chain, a -CH2CH2CF3 structure is formed. Since fluorine atoms have a large electron-withdrawing effect, plus The bond length of the C-F bond is shorter, which can form a better shielding effect on the C-C bond, greatly improving the oil resistance and solvent resistance of the rubber, making it good at resisting non-polar media at temperatures between -68°C and 232°C. of elastomer. Therefore, fluorosilicone rubber is widely used in the sealing fields of high-end motorcycles and military aerospace.


However, on the one hand, fluorosilicone rubber is expensive, and on the other hand, due to characteristics such as the electron-attracting effect of fluorosilicone rubber, it has a strong adsorption effect on surrounding dust, thus affecting its performance. Therefore, the production and operation process of fluorosilicone rubber is extremely strict. This article makes the following suggestions for this process:

     Transportation and storage of fluorosilicone rubber: During the storage and transportation of fluorosilicone rubber, the fluorosilicone rubber must be wrapped in isolation paper and plastic bags to prevent dust and impurities from coming into contact with the rubber and being absorbed.
     Cutting of fluorosilicone rubber: In the process of collecting and cutting fluorosilicone rubber, you must first clean the scissors or putty knife used, use alcohol to scrub the surface of the tool, and then cut the fluorosilicone rubber after it is clean. During the cutting process, try to avoid contact between hands, skin and rubber, but do not wear gloves to avoid contamination of fluorosilicone rubber by glove fibers or skin oils.
     Weighing of fluorosilicone rubber: Before weighing, the tray needs to be cleaned with alcohol.
     Mixing of fluorosilicone rubber: Before mixing, the rollers and baffles of the open mill must be wiped with alcohol to ensure that there is no impurity contamination. When mixing, attention should be paid to controlling the roller temperature. When the roller temperature is 18℃~28℃, the rubber mixing process performance is better. If you need to add silica to adjust the hardness, you must first pretreat the silica with hydroxyfluorosilicone oil.
     Vulcanization of fluorosilicone rubber: The mold for making fluorine rubber products must be surface treated, chrome plated, and an external release agent must be used if necessary.
     Second-stage vulcanization of fluorosilicone rubber: There are a large number of low molecular weight volatiles after the first-stage vulcanization of fluorosilicone rubber. Long-term use will affect the performance of fluorosilicone rubber, so general fluorosilicone rubber products must be second-stage vulcanized: Second-stage vulcanization of fluorosilicone rubber It is carried out in an electric heating blast box, using a gradual temperature rise method, and maintaining a constant temperature after reaching the required temperature. Generally, molded products: 200℃×4~6h.
     Re-training of fluorosilicone rubber: Fluorosilicone rubber that has been parked for a long time is easy to be structured and affects its performance. Therefore, it is necessary to re-train the rubber that has been parked for a long time. It is placed in the mixer and rolled 25 times. The mixing time is about 8 minutes. , to ensure that the materials are mixed evenly. If the surface is sticky to the roller, a rear scraper needs to be installed.
     Fluorosilicone rubber production environment: Since fluorosilicone rubber has the characteristics of electrostatic dust absorption, the production environment needs to be purified and dust-free workshop, and the production tools are special equipment. Workers must wear clean clothes and hats when entering and exiting operations.



Fluorosilicone compound for transformers