Phenyl Silicone Oil: Performance Password from Molecular Structure to Extreme Applications
Phenyl silicone oil, as the "king of performance" in silicone materials, has the ability to break through the physical limits of traditional silicone oil due to its chemical design of replacing methyl groups with phenyl groups in its molecular structure. Taking the 255 type phenyl silicone oil from Zhonglan Chengguang Chemical Research Institute as an example, its molecular chain has a phenyl content of 45%, and it maintains structural stability at a high temperature of 380 ℃. Its thermal decomposition temperature is 60% higher than that of ordinary silicone oil, and its low-temperature performance breaks through to -70 ℃ while still having flexibility. The adaptability of this "ice and fire duality" stems from the balance between the rigid structure of phenyl groups and the flexibility of silicon oxygen bonds: low phenyl types with a phenyl content of 5% -10% achieve fluidity in extremely cold environments by reducing the resistance of molecular chain movement; The high phenyl type enhances the thermal stability of the material through the aromatic ring conjugation effect of the phenyl group.


In the aerospace field, phenyl silicone oil has become the "lifeline" of key components. In the sealing system of the Long March 5 rocket engine, the 255 product continuously withstands high temperatures of 300 ℃ and pressures of 15MPa for over 1000 hours without any performance degradation. Its radiation resistance performance is three times higher than that of nuclear power plant protection standards. This performance breakthrough has upgraded phenyl silicone oil from a traditional lubricant to an extreme environmental guardian, providing material support for human exploration of space.