(July 27, 2026) Progress has been made in the domestic field of new organic silicon materials. The synthesis process of epoxy silicone oil (epoxy-based modified polysiloxane) continues to be optimized, and a series of products with high epoxy value and narrow molecular weight distribution have achieved stable mass production. This further accelerates the localization of high-end epoxy silicone oil and continues to empower upgrades across multiple industrial chains including electronic packaging, anti-corrosion coatings, new energy materials, and textile additives.
Epoxy silicone oil combines excellent weather resistance, low surface tension, low internal stress characteristics of organic silicon, as well as high reactivity and strong adhesion of epoxy groups, making it the mainstream reactive modifying additive in epoxy resin and polyurethane systems. Traditional ordinary epoxy resin is brittle after curing and prone to cracking during hot and cold cycles. Chemical modification by adding epoxy silicone oil can effectively reduce the thermal expansion coefficient of the curing system, improve toughness, resistance to high- and low-temperature impacts, and improve moisture-proof insulation performance. It has long been widely used in LED encapsulation adhesives, electronic insulation coatings, industrial anti-corrosion flooring, and functional fabric finishing agents.
According to industry research data, driven by demand for new energy vehicle power devices, photovoltaic packaging, and 5G communication materials, the domestic epoxy silicone oil market will maintain steady growth in 2026. Among them, automotive-grade electronic packaging and heavy-duty equipment anti-corrosion coatings led the growth rates, with market demand for epoxy silicone oil products with low volatility, high purity, and excellent batch stability significantly increased.
Previously, domestic supply of mid- to low-end epoxy silicone oil was sufficient, but high-end grades generally suffered from large epoxy fluctuation levels, high impurity content, and unstable resin compatibility, with some high-end applications relying on imports for a long time. At present, domestic new materials companies have launched two major product series: end-end epoxy silicone oil and side-chain epoxy silicone oil through catalytic system improvements and continuous synthesis process optimization: the controllable epoxy value range of products has been expanded, and the molecular weight distribution index has been significantly narrowed; Third-party testing shows that the modified epoxy adhesive system increases the number of thermal shock cycles by more than 60%, significantly enhances yellowing suppression, and achieves salt spray endurance exceeding 2000 hours, meeting the demanding requirements of precision electronics and marine corrosion protection.
On the downstream application side, the value of epoxy silicone oil continues to grow. In the electronics industry, it is used for modification of IGBT and LED packaging adhesives, alleviating the thermal stress mismatch between chips and packaging resins, and reducing the probability of device failure; In the coatings sector, as a modified component of high-performance anti-corrosion epoxy coatings, coatings are given advantages in hydrophobicity, stain resistance, and UV aging resistance; In the textile industry, it is used as an eco-friendly softening finishing agent to improve fabric smoothness and wash resistance; At the same time, it is gradually penetrating emerging sectors such as power battery structural adhesives and composite material bonding systems.
Industry experts analyze that with the advancement of the domestic "dual carbon" strategy and the deepening of domestic substitution in high-end manufacturing, market standards for environmentally friendly, high-performance silicone modified materials are continuously tightening. Low-VOC and solvent-free epoxy silicone oil will become the mainstream R&D direction. In the future, the focus of industry competition will shift from basic general products to customized specialty grades, and companies with molecular structure customization and stable mass production capabilities will capture more market share.
Meanwhile, the industry still faces challenges such as upstream monomer price fluctuations, technical barriers for high-end synthesis catalysts, and long downstream formulation co-development cycles. Many silicone companies are collaborating with universities and materials research institutes to tackle special varieties such as phenyl epoxy silicone oil and low-viscosity, fast-reacting epoxy silicone oil, continuously expanding the application boundaries of epoxy silicone oil in cutting-edge fields such as flexible electronics and aerospace protective coatings.
In the long run, as a key intermediate connecting the silicone and epoxy systems, epoxy silicone oil will continue to benefit from the development dividends of the new materials industry. As processes mature and product certifications continue to be implemented, domestic epoxy silicone oil is expected to continue replacing imported products and open up greater market opportunities.
