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What are the differences between fluororubber and fluorosilicone rubber?

by:ORK      2022-10-21
If fluororubber and fluorosilicone rubber are used together to prepare fluororubber/fluorosilicone rubber, what will happen to the performance? Fluorosilicone rubber is a kind of silicone rubber containing fluorine atoms in the side chain, its main chain is a silicon-oxygen bond, the molecular chain has good flexibility and excellent low temperature resistance. Fluorosilicone rubber contains a certain amount of unsaturated bonds, and a peroxide vulcanization system can be used for vulcanization. The vulcanization temperature and vulcanization time of fluororubber are roughly the same as those of fluorosilicone rubber, and the two can complete co-vulcanization, so it is theoretically feasible to use these two rubbers together. When the combined ratio of fluororubber/fluorosilicone rubber seals is 8/2, the physical function of the combined rubber is better. This is because in this combined ratio, fluororubber and fluorosilicone rubber form a sea-island structure with better mutual looseness. The relative increase or decrease of the proportion of silicone rubber will make the compatibility of the two phases worse. Medium resistance and brittle temperature The volume (mass) change rate is the change rate of the volume (mass) of the sample before and after treatment in the medium. The smaller the value, the better the medium resistance of the sample, and vice versa. Different combination ratios of fluororubber/fluorosilicone rubber increase with the increase in the amount of fluorosilicone rubber, the medium resistance of the combined rubber decreases slightly, and the low temperature resistance improves significantly; generally, the brittle temperature of fluororubber is only about -20 ℃, when fluorine When the combined ratio of rubber/fluorosilicone rubber is 5/5 and 8/2, the brittleness temperature of the combined rubber can reach -52 and -45 °C, respectively, and the low temperature resistance performance is greatly improved; The medium resistance performance has not been greatly reduced, even if the combined ratio of fluororubber/fluorosilicone rubber is 5/5, the combined rubber still has excellent medium resistance performance. SEM analysis selects fluororubber/fluorosilicone rubber with a combined ratio of 8/2 and 5/5 to analyze the microscopic shape of the cross-section. When the combined ratio of fluororubber/fluorosilicone rubber is 8/2, the combined glue forms a uniform phase state The structure shows no obvious delamination, indicating that the two rubbers have been co-vulcanized, and the microscopic performance is excellent; When cracks occur, the performance is significantly reduced, which indicates that the two glues are difficult to mix evenly and cannot form a loose and uniform sea-island or sea-sea structure.
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