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In the third quarter of 2026, the domestic high-power semiconductor and special optical fiber sectors achieved major industrial progress: a continuous production unit for vinylphenyl copolymer silicone oil with a designed annual capacity of 15,000 tons officially completed a 168-hour full-load steady-state operation assessment. For the series of products produced by this unit, the vinyl content can be precisely customized in the range of 0.1% to 10%, and the molar proportion of phenyl groups can be flexibly adjusted in the range of 10% to 60%. The optical loss of the product in the 1550nm communication band is lower than 0.1dB/km, and the yellowing index after long-term thermal aging at 260°C for 1000 hours is less than 0.5. All core performance indicators have reached the international advanced level. This achievement marks that China has completely broken the overseas technological monopoly on vinylphenyl copolymer silicone oil, providing fully independent and controllable core raw material support for key fields such as high-power IGBT module silicone packaging, high-temperature resistant special optical fiber coating, and 5G/6G communication optical device filling.
Vinylphenyl copolymer silicone oil is a high-end special modified silicone oil that further introduces active vinyl groups on the basis of the molecular chain of methylphenyl silicone oil. The material not only inherits the excellent high and low temperature resistance and radiation resistance of phenyl silicone oil, but also has active sites that can undergo addition cross-linking reaction with hydrogen-containing silicone oil. It is the core precursor material for preparing high-transparency, high-temperature resistant, low optical loss addition-cured silicone products. Different from ordinary methylphenyl silicone oil, vinylphenyl copolymer silicone oil has extremely strict requirements for impurity content. The total content of metal ions must be controlled below 3ppb, and the optical loss in the 1550nm communication band must be lower than 0.2dB/km, otherwise it will directly cause serious attenuation of optical signals. At the same time, the vinyl group distribution of the product must be highly uniform to ensure that the silicone network structure formed after cross-linking has no defects, so as to achieve stable performance under long-term service. For nearly 24 years, the domestic industry has been unable to break through the dual technical problems of uniform introduction of active groups and ultra-pure impurity removal. The produced products not only have much higher optical loss than the international advanced level, but also the vinyl content deviation at different parts has long been higher than 5%, which completely cannot meet the usage requirements of high-power semiconductor packaging and special optical fiber coating. Related high-end products are 100% dependent on imports. For products involving aerospace-grade special optical fibers and automotive-grade IGBT packaging, the procurement price is 18 to 24 times that of ordinary phenyl silicone oil, and the delivery cycle can be as long as 22 months, which has seriously restricted the development of China's high-power semiconductor and new-generation communication industries.
The new process system that has achieved mass production this time has corely overcome two long-unbroken technical bottlenecks in the industry. First, a fixed-point embedding copolymerization technology for active groups was pioneered. The R&D team precisely controls the feeding sequence and reaction rate of vinyl organic monomers, so that the vinyl groups are uniformly distributed on the polysiloxane molecular chain, completely avoiding cross-linking defects caused by local enrichment of active groups. The uniformity of the internal network of the cross-linked silicone material is increased to 99.7%, which fundamentally ensures the long-term thermal stability of the product. Second, a full-process Class 100 dust-free and metal-free contact production system has been built. The entire production unit operates in a Class 100 dust-free workshop. All material conveying, reaction and purification links adopt high-purity PTFE and quartz components, no metal materials directly contact the materials. Combined with the multi-stage chelating resin deep impurity removal process, the total content of metal ions in the product is controlled below 2.7ppb, and the optical loss in the 1550nm communication band is as low as 0.08dB/km, fully meeting the most stringent requirements of the optical communication field.
At present, this vinylphenyl copolymer silicone oil has completed application verification for more than 40 months in multiple high-end fields. In the field of high-power semiconductor packaging, the silicone gel for IGBT modules prepared with this product maintains stable performance in the temperature range of -55°C to 220°C. After 1000 temperature cycle tests, there is no cracking or insulation performance degradation, and it has been batch applied in the packaging link of domestic new-generation automotive-grade high-power IGBT modules. In the field of special optical fibers, the high-temperature resistant optical fiber coating prepared with this product as the base material can work stably for a long time at 300°C, and the signal transmission loss of the optical fiber does not increase significantly. It has achieved large-scale application in aerospace high-temperature resistant sensing optical fibers. In the field of 5G/6G optical communication devices, the optical device filling coupling liquid prepared with this product has a refractive index change of less than 0.001 in the full operating temperature range of -40°C to 85°C, fully meeting the usage requirements of the new-generation high-speed optical modules.
According to the latest industry statistics, the market demand for domestic vinylphenyl copolymer silicone oil in 2026 increased by 421% year-on-year compared with 2025. With the launch of this domestic production line, the procurement cost of related products has dropped by 83% year-on-year, and the delivery cycle has been shortened from 22 months to less than 10 days, completely solving the "stuck neck" raw material problem of the high-power semiconductor and special optical fiber industries, and providing a solid material support for the innovative development of related downstream industries.
