Terminal Epoxy Silicone Oil: Driving Material Performance Upgrade for Diverse Industrial Sectors

Terminal epoxy silicone oil is a reactive silicone oil with epoxy groups introduced at both ends of linear polydimethylsiloxane molecular chains. Its mainstream synthetic routes fall into two categories: the two-step hydrosilylation process and the one-step ring-opening copolymerization process^[1].

Two-Step Process

Terminal hydrogen-containing silicone oil is first prepared via acid catalysis. Subsequently, under platinum-based catalysis, hydrosilylation takes place between the terminal hydrogen silicone oil and unsaturated epoxy compounds (e.g., allyl glycidyl ether, unsaturated epoxy polyethers), grafting epoxy groups onto both molecular terminals.

One-Step Process

Direct ring-opening equilibrium copolymerization is carried out between epoxy end-capping agents and cyclic siloxane monomers under alkaline catalysis to synthesize terminal epoxy silicone oil in a single step. This streamlined process is ideal for manufacturing high-molecular-weight grades.

Though the two processes differ in workflow, they achieve the same target: high-quality terminal epoxy silicone oil. The silicone backbone retains polydimethylsiloxane’s inherent merits including wide temperature resistance, low surface tension and excellent flexibility. Meanwhile, the reactive epoxy groups at molecular terminals undergo ring-opening reactions with amines, anhydrides, phenols and other substances, enabling covalent bonding with various organic resins. This versatile reactivity drives its extensive adoption across diverse industries.

Textile Chemicals: New Low-Yellowing Softening Solution

Terminal epoxy silicone oil serves as the core raw material for synthesizing triblock silicone oil. Reacting its active epoxy groups with polyether amines yields block silicone oils integrating softness and hydrophilicity, which effectively eliminate the drawbacks of conventional amino silicone oils such as severe yellowing, poor hydrophilicity and easy demulsification, delivering a silky, fluffy premium hand feel to fabrics.

Resin Modification: Core Additive for Low-Stress Toughening

Used as an internal additive for epoxy resin systems, terminal epoxy silicone oil reacts with epoxy curing agents to incorporate flexible siloxane segments into crosslinked networks. It lowers internal stress of the system and delivers prominent toughening performance, balancing rigidity and flexibility of epoxy materials.

Release Agents: Key Component for High-Efficiency Demolding

Boasting ultra-low surface tension, terminal epoxy silicone oil drastically reduces demolding resistance, improves lubricity and surface smoothness of release agents to optimize demolding performance. It also strengthens adhesion and uniform spreading of release agents on mold surfaces for consistent, efficient demolding results.

Cheersil 8200 Series Terminal Epoxy Silicone Oil

Cheerchem leverages self-produced core intermediates including Cheersil 8000 series terminal hydrogen silicone oil, Cheersil 8220 epoxy end-capping agent, Cheersil 191 allyl glycidyl ether and Cheersil E series unsaturated epoxy polyethers. We implement strict raw material quality control and maintain stable, self-contained supply chains. Backed by these strengths, we have built a full portfolio of terminal epoxy silicone oil products to deliver customized formulations matching varied customer requirements.

• Cheersil 8220 Series Bis-terminal Monoepoxy Silicone Oil Complete molecular weight coverage across full ranges:
  • MW ＜ 5000 g/mol: Optimized for resin modification and release agent applications
  • MW ＞ 5000 g/mol: Primarily used to synthesize triblock silicone oil Fabric hand feel is precisely tunable by adjusting molecular weight: lower molecular weights deliver silky smoothness while higher grades create plump, voluminous texture to satisfy diverse softness demands. CAS No.: 102782-97-8

• Cheersil 8240 Series Bis-terminal Monoepoxy Polyether Silicone Oil It inherits the epoxy reactivity of Cheersil 8220 series while introducing polyether segments. It readily reacts with low-molecular polyether amines for triblock silicone oil synthesis.

• Cheersil 8260 Series Bis-terminal Diepoxy Silicone Oil Higher epoxy functionality enables dense crosslinking during curing. When applied to triblock silicone oil production, it imparts fabrics with rich, layered, full hand feel.

More molecular structures, molecular weights and epoxy functionalities unlock broader application possibilities. Cheerchem offers custom R&D services and looks forward to joint innovation with partners worldwide.

About Cheerchem

Cheerchem is a high-tech enterprise specializing in the R&D, production and sales of functional organosilicon materials, lithium battery electrolyte additives and electrolytes. The Group owns four subsidiaries: SHANDONG CHEERCHEM ADVANCED MATERIAL CO., LTD., FUZHOU CHEERCHEM NEW ENERGY MATERIAL CO., LTD., SUZHOU QIZHU ADVANCED MATERIAL CO., LTD., and HANGZHOU SILONG MATERIAL TECHNOLOGY CO., LTD.Our annual production capacity of functional organosilicon products reaches nearly 30,000 tons to fulfill mass and differentiated client demands.

Adhering to the core values of "Morality & Honesty、 Dedication & Devotion、 Lean & Innovation", Cheerchem focuses on developing premium, innovative high-end materials. We lead sustainable high-quality growth with green technology, create tangible value for global customers, and strive to build a brighter future together.

References

[1] Ge Jiangbo. Block Silicone Oil and Its Application Practice[J]. Auxiliaries & Finishing Agents, 2025,42(06):19-25.