Breakthrough in Preparation Technology of High-Purity Ultra-Low Viscosity Methyl Silicone Oil, Assisting Localization Replacement in High-End Fields

(Special Report) Recently, a domestic research team has successfully developed a green preparation method for high-purity ultra-low viscosity dimethyl silicone oil. This method breaks through the bottleneck of traditional preparation technology, effectively solves the problems of many by-products, catalyst residue and low precision of polymerization degree control, realizes the dual improvement of product purity and preparation efficiency, lays a technical foundation for the application of methyl silicone oil in high-end fields, and assists the localization replacement process of China's high-end organosilicon materials. It is understood that high-purity ultra-low viscosity methyl silicone oil (purity >99.8%, number-average molecular weight 1000-5000) is in urgent demand in high-end scenarios such as micro-electro-mechanical systems (MEMS), medical catheter coatings and electronic component heat dissipation media due to its good fluidity, strong permeability and excellent compatibility. Traditional preparation methods mostly use acids and bases as catalysts, which have disadvantages such as many by-products, serious equipment corrosion and inability to recycle catalysts, making it difficult to meet the requirements of high-end fields for product purity. The newly developed preparation method adopts electrocatalytic directional regulation technology, realizes selective catalysis of ring-opening polymerization reaction through Ti/SnO₂ or Pt/TiO₂ electrodes, and combines hydrophobic ionic liquid electrolysis system and permeable membrane to remove cyclic by-products in real time, synchronously controlling polymerization degree and purity. The process can be carried out at a low temperature of 35-50℃, avoiding side reactions caused by high temperature, and the electrolyte can be recycled to achieve green and efficient preparation. Tests show that the purity of methyl silicone oil prepared by this method can reach more than 99.9%, with low volatility and excellent thermal stability. All performance indicators meet the level of international similar products, which can effectively replace imported products and greatly reduce the dependence of high-end fields on imported methyl silicone oil.