As a core basic raw material for addition-cure liquid silicone rubber (LSR), the application of vinyl silicone oil in the fields of new energy, medical treatment, and electronic electrical is experiencing explosive growth. With the continuous improvement of performance requirements for materials in downstream industries, high-performance vinyl silicone oil has become a key driving force for the development of the liquid silicone rubber industry.
Core Performance and Technical Indicators
Vinyl silicone oil refers to polysiloxanes with vinyl groups at one end, both ends, or on the side chains, and is the base polymer for preparing addition-cure liquid silicone rubber. Its structural characteristics determine the performance of the final product:
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Diverse molecular structures Mainly divided into vinyl-terminated polydimethylsiloxane and side-chain vinyl polymethylvinylsiloxane. The vinyl content is usually between 0.1% and 10%, and the viscosity ranges from 100 mPa·s to tens of thousands of mPa·s. By adjusting the vinyl content, molar mass, and distribution, the hardness, strength, and elasticity of the vulcanized rubber can be precisely controlled.
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Excellent processing performance As a basic raw material for LSR, vinyl silicone oil has the characteristics of low viscosity and good fluidity, making it convenient for metering, mixing, and injection molding. Under the action of a platinum catalyst, it undergoes a hydrosilylation reaction with hydrogen-containing silicone oil. The vulcanization process produces no by-products, has minimal shrinkage, allows for deep curing, and is suitable for the production of precision products.
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Main application fields
Electronic and electrical potting: Used for moisture-proof, dust-proof, and anti-corrosion potting of components, requiring low ion content and high insulation.
Liquid Injection Molding (LSR): Used for precision products such as medical catheters, baby pacifiers, and automotive seals, requiring high purity and biocompatibility.
Mold rubber: Used for making precision molds, with high dimensional stability, many demolding cycles, and a long service life.
Silicone gel: Used for potting high-power IGBTs and as a protective coating for semiconductor chips, featuring low moisture absorption and good adhesion.
Industry Development Trends
According to the "2025 Vinyl Silicone Oil Industry Analysis Report and Future Development Trend Forecast" and related research on the liquid silicone rubber industry, the future development of vinyl silicone oil presents the following trends:
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Explosive demand driven by new energy vehicles The safety requirements for batteries in new energy vehicles have driven a surge in the use of thermally conductive adhesives and structural adhesives. As a basic raw material, vinyl silicone oil is widely used in key components such as battery pack sealing, high-voltage cable insulation, and high-temperature resistant gaskets. The demand in related fields is expected to grow at an annual rate of over 15%, becoming a core growth pole.
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High-end trends in medical and electronic fields The medical device and semiconductor industries have extremely high requirements for material purity. In the future, electronic-grade and medical-grade vinyl silicone oils with low volatility, low ion content (alkali metal ions and chloride ions below 0.1×10⁻⁶), and high transparency will become the focus of research and development. Especially in the fields of implantable medical devices and high-frequency high-speed copper clad laminates, products are required to achieve a purity of 9N or higher.
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Technological innovation and performance improvement By introducing nanomaterials and functional modifications (such as flame retardancy, thermal conductivity, and electrical conductivity), the comprehensive performance of vinyl silicone oil and downstream LSR is improved. The application of continuous production equipment will help ensure product capacity and quality stability, solving the problem of uneven quality among domestic manufacturers.
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Industry chain integration and localization Domestic enterprises are transforming from self-sufficiency to large-scale and specialized operations. Leading enterprises achieve vertical integration by building an integrated platform of "raw materials - synthesis - application", realizing the localization and substitution of international giants in high-end fields, and enhancing global market competitiveness.
Conclusion
Facing opportunities and challenges, relevant enterprises will continue to adhere to the philosophy of "Innovation, Quality, Service", deeply cultivate the research, development, and production of vinyl silicone oil and liquid silicone rubber materials, closely track market demands and technological frontiers, continuously launch higher-performance and more competitive products, and provide reliable organosilicon material solutions for global customers in the fields of new energy, medical treatment, electronics, and precision manufacturing.
