Breakthrough in Ethyl-Vinyl Silicone Oil Patent Technology: Next-Generation Liquid Silicone Rubber Performance Leap


      In early 2026, an invention patent titled “A Side-Chain Silicon-Hydrogen Bond-Containing Terminal Vinyl Silicone Oil, Preparation Method, and Liquid Silicone Rubber Thereof” was published, marking a significant breakthrough in crosslinker technology for liquid silicone rubber. This innovation not only significantly enhances the mechanical properties and anti-structuring capability of LSR but also opens new possibilities for the application of ethyl-vinyl silicone oil in high-end rubber products.
      In January 2026, the China National Intellectual Property Administration published a patent titled “A Side-Chain Silicon-Hydrogen Bond-Containing Terminal Vinyl Silicone Oil, Preparation Method, and Liquid Silicone Rubber Thereof” (Publication No. CN121270926A). The patent, filed by a domestic organosilicon technology company, involves technological innovation in vinyl silicone oil—a key raw material for liquid silicone rubber (LSR)—and holds significant reference value for understanding the potential development direction of ethyl-vinyl silicone oil.

Technological Breakthrough: Molecular Structure Design and Performance Optimization
       According to the patent abstract, the technology involves mixing linear polymer, end-capper, and side-chain hydrogen-containing silicone oil, heating to 60-100°C, adding a linear phosphazene catalyst under vacuum conditions for reaction, followed by neutralization, filtration, and devolatilization. The resulting side-chain silicon-hydrogen bond-containing terminal vinyl silicone oil has a molecular structure where m=450-1250 and n=2-5. This parameter range indicates a higher molecular weight vinyl silicone oil with appropriate levels of active hydrogen groups on the side chains.
       Compared to traditional terminal vinyl silicone oils, side-chain silicon-hydrogen bond-containing vinyl silicone oils provide more crosslinking points during vulcanization, enabling the formation of a more uniform three-dimensional network. This significantly enhances the mechanical properties of liquid silicone rubber: tensile strength, tear strength, and abrasion resistance are all substantially improved. More importantly, the technology significantly reduces structuring—a common problem where viscosity increases during LSR storage—without materially affecting material hardness.

Ethyl-Vinyl Silicone Oil: A Superior Alternative?
      Although the patent primarily addresses methyl-vinyl silicone oil, its molecular design approach is equally applicable to ethyl-vinyl silicone oil. In fact, replacing side-chain methyl groups with ethyl groups could further enhance the heat resistance and hydrophobicity of silicone rubber. Ethyl-vinyl silicone oil combines the high-temperature stability of ethyl silicone oil with the crosslinkability of vinyl silicone oil, making it an ideal base polymer for high-performance silicone rubber.
      In demanding applications such as aerospace, automotive manufacturing, and petrochemicals, seals, gaskets, and hoses made from ethyl-vinyl silicone oil can provide long-term service above 200°C while resisting lubricating oils, fuels, and chemical media. This makes it the “ultimate solution” for high-end applications where conventional rubber materials cannot perform.

LSR Market Expansion Driving Upstream Demand
       Liquid silicone rubber is the largest downstream market for vinyl silicone oil. According to QYResearch, the global vinyl silicone oil market was approximately USD 1.418 billion in 2025 and is projected to reach USD 1.847 billion by 2032, with a compound annual growth rate (CAGR) of 3.9%. The widespread application of LSR in medical devices, baby products, electronic seals, and automotive components is the core driver of vinyl silicone oil market growth.
       In the Chinese market, LSR demand growth significantly exceeds global averages. On one hand, the rapid development of the domestic medical device industry drives demand for medical-grade LSR; on the other hand, the proliferation of new energy vehicles has significantly increased demand for oil-resistant, high-temperature-resistant silicone rubber seals. These trends flow through to upstream vinyl silicone oil (including ethyl-vinyl silicone oil) suppliers.

Green Processes: Catalytic Innovation Driving Industry Transformation
       It is worth noting that the patent‘s use of a linear phosphazene catalyst—replacing traditional acid or base catalysts—is emblematic of the industry’s green transformation. Traditional vinyl silicone oil synthesis often uses concentrated sulfuric acid or tetramethylammonium hydroxide (TMAH) as catalysts. The former generates large volumes of acidic wastewater, while the latter decomposes at high temperatures to produce toxic trimethylamine gas. Phosphazene catalysts offer high activity, ease of neutralization, and no toxic byproducts, aligning with “dual carbon” goals.
       Low-cyclic vinyl silicone oil has also become an important industry direction. Previously, the high-end vinyl silicone oil market was dominated by a few multinational chemical giants, whose products contained high levels of cyclics such as D4 and D5. These cyclics not only have potential reproductive toxicity and environmental persistence but also force downstream encapsulators to add energy-intensive post-curing steps.
       Through unique catalytic systems and multi-stage molecular distillation processes, domestic enterprises have successfully reduced harmful cyclic content to extremely low levels below 100ppm, completely eliminating costly and cumbersome post-curing steps. These low-cyclic products not only meet EU REACH strict limits on D4/D5 but also achieve import substitution in high-end applications such as 5G base station power modules, new energy vehicle electronic control units, and AI/HPC chip packaging.

Future Outlook
       Although the production cost of ethyl-vinyl silicone oil is higher than that of methyl-vinyl silicone oil, its performance advantages in high-temperature resistance and chemical resistance make it irreplaceable in specific high-end applications. As synthesis processes are optimized and scale production advances, production costs are expected to decrease, promoting broader substitution for methyl products in industrial applications.
       Industry experts predict that over the next 3-5 years, ethyl-vinyl silicone oil will achieve large-scale application in aerospace seals, deep-well drilling equipment, and semiconductor high-temperature processes, becoming a “small but specialized” growth pole in the specialty organosilicon materials sector.