Breakthrough Technologies in Hydrogen-Containing Silicone Oil: Supercritical CO₂ Composite Foaming Agent, Hydrophilic Modification, and Chlorine-Resistant Silicone Oil Lead Innovation Wave

The unique molecular architecture of hydrogen-containing silicone oil, characterized by reactive silicon-hydrogen (Si-H) bonds, is driving a wave of technological innovation across multiple industries. From environment-friendly composite foaming agents to advanced textile finishes and chlorine-resistant silicone oils, new breakthroughs are expanding the boundaries of what this versatile material can achieve.

Breakthrough 1: Supercritical CO₂ Composite Foaming Agent Technology

In January 2026, a patent for hydrogen-containing silicone oil-supercritical carbon dioxide composite foaming agent attracted significant industry attention. This technology employs hydrogen-containing silicone oil with 0.8%-1.5% hydrogen content as the base material, incorporates 5%-15% by volume of supercritical carbon dioxide as the foaming agent component, and utilizes surface-modified nanosilica (10-50 nm particle size, modified with silane coupling agents) combined with nonionic surfactants to achieve precise cell structure control and efficient foaming.

The significance of this technological breakthrough lies in providing an environment-friendly, performance-controllable foaming agent solution. Traditional chemical foaming agents often suffer from residue contamination and poor process stability. In contrast, the supercritical CO₂ composite foaming agent is not only green—since supercritical CO₂ is non-toxic, non-flammable, and ozone-friendly—but also enables precise microstructural design of foamed materials by controlling the hydrogen content of the silicone oil and the dispersion state of nano-additives.

This technology is expected to find widespread applications in lightweight materials, soundproofing and insulation materials, and cushioning packaging. The combination of nano-silica as a heterogeneous nucleating agent and supercritical CO₂ as a blowing agent creates a synergistic effect that significantly reduces bubble nucleation energy barriers and promotes uniform cell distribution.

Breakthrough 2: Hydrophilic Modification of Polysiloxane for Textile Finishing

Research published in 2026 demonstrates that modified polysiloxanes prepared from hydrogen-containing silicone oil through a four-step synthesis successfully overcome the primary defects of traditional amino silicone oil softeners. The four-step synthesis method uses diethanolamine, allyl bromide, and hydrogen-containing silicone oil to produce single- and double-dihydroxyalkylamino-terminated polysiloxanes.

Traditional amino silicone oils, while providing excellent softness to fabrics, suffer from yellowing due to oxidation of amino groups, which degrades the color of white or light-colored fabrics. Additionally, they render fabric surfaces hydrophobic, affecting wearing comfort. The novel dihydroxyalkylamino-modified polysiloxane transforms the hydrophobic nature of traditional silicone treatments to hydrophilic, while the tertiary amine structure effectively resists yellowing defects. Whiteness difference values fall within the normal yellowing range, preserving fabric color and brightness.

Fabrics treated with this modified polysiloxane achieve softness ratings exceeding 4.0. Fabric resistance decreases from 10¹³Ω to 10¹²Ω, indicating improved antistatic performance. Certain tear strength values approach or exceed those of commercially available hydrophilic amino silicone oils.

Breakthrough 3: Chlorine-Resistant Hydrophilic Silicone Oil

In February 2026, a patent titled "A Hydrophilic Chlorine-Resistant Silicone Oil, Preparation Method and Application" was published. The molecular structure of this silicone oil simultaneously contains hydrophilic polyether segments and chlorine-resistant functional segments. The preparation involves the hydrosilylation reaction of terminal hydrogen-containing silicone oil with allyl epoxy polyether in the presence of a platinum catalyst, followed by amination with terminal primary amine polyetheramine to form soft hydrophilic segments.

Chlorine-resistant functional segments are then grafted onto the main chain using a crosslinking agent through a specialized process. This technology completely resolves three long-standing problems of traditional amino silicone oils: hydrophobicity, yellowing tendency, and poor chlorine resistance. Conventional hydrophilic block silicone oils, while improving hydrophilicity, still lack chlorine resistance, limiting their application in textiles requiring chlorine bleaching treatments such as hotel linens, medical fabrics, and workwear.

Breakthrough 4: Terminal-Hydrogen Silicone Oil – Molecular Structure Innovation

Terminal-hydrogen silicone oil (hydrogen-terminated dimethylsiloxane-polysiloxane) features a unique molecular structure with a silicon-hydrogen bond at each end of the molecular chain. This structural arrangement greatly enhances chemical reactivity and selectivity compared to pendant-hydrogen variants.

The synthesis process uses high-hydrogen-content polysiloxane and cyclosiloxane as monomers, with organic solvent and terminal-hydrogen endblocker, under acidic catalyst for polymerization. After water washing and low-boiling component removal, the product achieves adjustable hydrogen content between 0.1-1.2wt%, with high refractive index, high light transmittance, and high-temperature resistance.

Key applications of terminal-hydrogen silicone oil include: as a crosslinking agent for addition-cure silicone rubber and silicone resin, improving mechanical properties and thermal performance; as a chain extender for addition-cure thermal conductive silicone rubber, improving processability and mechanical properties; as a basic intermediate for hydrosilylation reactions to produce various terminal-reactive linear modified silicone oils; and as a key intermediate for block copolymerization reactions.