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In June 2026, another important progress was made in the field of domestic organosilicon special intermediates: the low-volatility terminal hydrogen-containing silicone oil product specially customized for the high-end electronic information industry officially achieved 10,000-ton mass production. The silicon-hydrogen bonds of this product are 100% concentrated at both ends of the molecular chain, the molecular structure regularity reaches 99.2%, the volatile content is lower than 15ppm, and the error of active hydrogen content is controlled within ±0.02%. The successful mass production of this product fills the long-term technical gap in high-end categories of domestic terminal hydrogen-containing silicone oil, directly solves the "stuck neck" problem of the core raw material for high-end electronic packaging addition-cured liquid silicone rubber in China, and provides key material guarantee for the supply chain security of domestic new-generation 5G communication base stations, AI server chip packaging, consumer electronics waterproof protection and other industries.
Terminal hydrogen-containing silicone oil is a special structure of hydrogen-containing silicone oil. Different from ordinary hydrogen-containing silicone oil with side chain hydrogen, its two silicon-hydrogen bonds are accurately distributed at both ends of the linear polysiloxane molecule, and the entire molecule presents a perfect linear structure without random distribution of side group active groups. This unique molecular structure allows it to form a completely linearly extended cross-linking network when participating in the addition reaction as a cross-linking agent, completely avoiding the local three-dimensional excessive cross-linking problem that easily occurs when ordinary side hydrogen-containing silicone oil is cross-linked. The prepared addition-cured silicone rubber has lower internal stress, higher transparency, better yellowing resistance and more stable dielectric properties, and is an irreplaceable core raw material in the current high-end electronic packaging field. For a long time in the past, the traditional ionic polymerization process was commonly used in the production of domestic terminal hydrogen-containing silicone oil, which could not accurately control the end-capping position of active hydrogen. The produced products were mixed with a large number of impurity components with side chain hydrogen, and the molecular structure regularity was less than 80%, which could not meet the application requirements of high-end electronic fields. Previously, the ultra-high-purity terminal hydrogen-containing silicone oil used in China's high-end electronic packaging industry was almost completely dependent on imports. Not only was the procurement cost 6-8 times that of ordinary hydrogen-containing silicone oil, but it also long faced risks such as unstable supply and embargo of special specifications, which seriously restricted the pace of China's electronic information industry upgrading to high-end manufacturing.
The low-volatility terminal hydrogen-containing silicone oil product that has achieved mass production this time has achieved two subversive innovations in core technologies. On the one hand, the precise anchoring controllable polymerization technology of active end-capping agents was innovatively developed. The technical team designed a brand-new directional end-capping reaction system for hydrogen-containing double caps. By precisely matching the proportion of the double-end hydrogen-containing end-capping agent and the cyclic siloxane monomer at the initial stage of the reaction, and cooperating with a new type of controllable ring-opening catalyst, the polymerization reaction extends along the linear direction from beginning to end, completely avoiding the random generation of side group silicon-hydrogen bonds during the polymerization process. The molecular structure regularity of the final product reaches 99.2%, and the terminal hydrogen-containing proportion exceeds 99%, completely solving the industry problem of messy product components in traditional processes. On the other hand, a non-damaging deep devolatilization process for terminal hydrogen-containing systems was developed. Aiming at the characteristics of high linearity of the molecular chain of terminal hydrogen-containing silicone oil and concentrated boiling point distribution, the team innovatively adopted a multi-stage series vacuum falling film devolatilization coupled with inert gas purging process. The small molecule devolatilization is completed under the mild temperature condition of the whole process below 80°C, completely avoiding the fracture and deactivation of silicon-hydrogen bonds in a high-temperature environment, and the total volatile content of the final product is controlled below 15ppm. At the long-term working temperature of 120°C for electronic packaging, no small molecular substances will precipitate.
At present, this domestically produced low-volatility terminal hydrogen-containing silicone oil has completed batch application verification in multiple high-end electronic information industry scenarios. In the field of AI server chip packaging, the chip underfill silicone rubber prepared with this product has extremely low cross-linking internal stress, which will not cause stress damage to precision chips below 7nm process. At the same time, the dielectric constant of the product is stably maintained at 2.7, and the dielectric loss is lower than 0.002, which fully meets the strict requirements of high-computing power chips for high-speed signal transmission. Related products have been widely used in the new-generation computing power products of leading domestic AI server enterprises. In the field of antenna packaging for 5G communication base stations, the potting glue prepared with this terminal hydrogen-containing silicone oil has extremely high transparency and weather resistance. After 1000 hours of high temperature and high humidity aging test, the yellowing index of the glue layer is still lower than 0.5, which will not cause any interference to the signal transmission of 5G antennas, and has been batch applied in the construction projects of new-generation 5G base stations in China. In the field of consumer electronics, the waterproof and sealing silicone rubber prepared with this product has no small molecule precipitation after curing, will not corrode the precision electronic components inside consumer electronics, and the waterproof level can reach IP68. It has been widely used in the waterproof protection links of high-end smartphones, smart watches, wireless earphones and other products. In the field of optoelectronics, the optical-grade organosilicon packaging glue prepared with this high-purity terminal hydrogen-containing silicone oil has a light transmittance of 99.2%. After 2000 hours of strong blue light irradiation, the light transmittance retention rate still exceeds 98%, which perfectly adapts to the packaging requirements of new-generation display devices such as Mini LED and Micro LED.
According to the latest industry statistics, the market demand for domestic electronic-grade terminal hydrogen-containing silicone oil in 2026 has increased by 189% year-on-year compared with 2025. The successful mass production of domestic products this time has directly broken the long-term monopoly of overseas enterprises in this field. The core raw material procurement cost for downstream electronic packaging enterprises has decreased by 70%, and the product delivery cycle has been shortened from the original 6 months to 5 days. With the continuous release of subsequent supporting production lines, it is expected that by 2027, the domestic market share of domestically produced electronic-grade terminal hydrogen-containing silicone oil will reach more than 90%. It will not only completely solve the core raw material supply risk of the domestic electronic information industry, but also promote China's high-end electronic packaging material industry to gain stronger competitive advantages in the global market.
