Hydroxyl Silicone Oil Enters Active R&D Phase: Phenolic Hydroxyl Modification, Low-Cyclic Purification, and Marine Antifouling Applications Lead Innovation

The hydroxyl silicone oil sector is witnessing a surge in technological innovation in 2026. From molecular structure design to purification process improvements and downstream application innovations, a wave of patented technologies is reshaping the technical boundaries and application scenarios of hydroxyl silicone oil.

Breakthrough 1: Phenolic Hydroxyl-Modified Polysiloxane

In May 2026, a patent titled "Phenolic Hydroxyl Protection-Deprotection Two-Step Method for Synthesizing Phenolic Hydroxyl-Modified Polysiloxane" attracted significant industry attention. The technology uses unsaturated alkenyl phenol as the raw material, employs a protecting agent to selectively protect hydrogen atoms in the phenolic hydroxyl group, and yields a phenolic hydroxyl-protected alkenyl phenol intermediate. Under the action of a platinum-based catalyst, this intermediate undergoes addition reaction with hydrogen-containing silicone oil, followed by deprotection to produce phenolic hydroxyl-modified polysiloxane.

The core breakthrough of this technical route is that the protection-deprotection strategy significantly improves the selectivity of the hydrosilylation reaction and product yield. The resulting product has low free phenol content while combining the weather resistance of silicones with the reactivity of phenolic hydroxyl groups. This technology can be widely applied across numerous fields, opening new pathways for molecular structure design of hydroxyl silicone oil.

Breakthrough 2: Low-Cyclic Purification Technology

Stringent environmental regulations are driving innovation in purification technology. In January 2026, China's National Medical Products Administration announced the inclusion of cyclotetrasiloxane (D4) in the prohibited list of cosmetic ingredients, effective January 1, 2027. Although this regulation primarily targets the cosmetics sector, its implications extend throughout the silicone industry.

D4 is a common cyclic byproduct in silicone production. When linear polysiloxanes such as hydroxyl silicone oil undergo polymerization or cracking, certain amounts of cyclic oligomers including D4, D5, and D6 may be generated. Historically, the control of these cyclics in industrial products has not been strict.

In response to increasingly stringent regulatory environments, hydroxyl silicone oil manufacturers are taking proactive measures. By improving polymerization processes and optimizing devolatilization equipment, controlling total D4, D5, and D6 residues below 0.1% has become the entry ticket to the cosmetics and personal care supply chain. Some leading manufacturers have completed fully enclosed high-purity production lines using molecular distillation and other refining technologies, reducing cyclic residues to below 50 ppm.

Breakthrough 3: Marine Antifouling Coatings

An April 2026 patent titled "Preparation Method and Application of Acrylic-Modified Maleic Acid Dihydroxy Silicone Oil Resin" revealed new potential for hydroxyl silicone oil in marine engineering. The technology synthesizes acrylic-modified maleic acid dihydroxy silicone oil resin and further uses this resin to prepare micro-nano self-wrinkling hydrogel silicone antifouling coatings.

The technical principle is highly innovative: in the synthesized acrylic-modified maleic acid dihydroxy silicone oil resin, the hydrophobicity of silicon methyl groups and the hydrophilicity of hydroxyl groups create a structure where roots repel each other while tips remain hydrophilic. This forms a micro-nano self-wrinkling surface in water with a lotus leaf effect, resisting wetting and marine bioadhesion.

Even if some marine organisms attach, the weak adsorption on the micro-nano self-wrinkling surface allows easy detachment under shear force when the vessel moves. The micro-nano self-wrinkling surface also significantly reduces frictional resistance, achieving 12-15% drag reduction and 12-15% energy savings in vessel navigation tests, generating substantial economic benefits.

Breakthrough 4: Reactive Silicone Oil Synergistic Innovation

In March 2026, a patent titled "Reactive Silicone Oil and Its Preparation Method and Application" was granted. The preparation method involves reacting hydroxyl silicone oil with chlorotrimethylsilane under nitrogen protection, followed by further reaction with methyldichlorohydrosilane. Finally, divinyl-terminated silicone oil, platinum catalyst, and the previous product are mixed and reacted to obtain the final product.

This reactive silicone oil can replace dimethyl silicone oil in rubber compounds, reducing potting compound viscosity while significantly minimizing the exudation issues associated with conventional dimethyl silicone oil. This technological innovation provides a new material solution for optimizing electronic potting compound performance.