Introduction
Perfluorooctyl Triethoxysilane is a high-performance organofluorosilane compound that serves as a premier surface modifying agent. This colorless liquid is engineered to impart robust, durable hydrophobic (water-repellent) and lipophobic (oil-repellent) properties to a wide variety of substrates [1]. By forming stable covalent bonds with surfaces, it creates a protective molecular layer that is integral to advanced formulations in cosmetics, industrial coatings, and protective treatments.
Biochemical & Physical Parameters
| Parameter | Specification |
|---|---|
| CAS No. | 51851-37-7 |
| INCIName | Perfluorooctyl Triethoxysilane |
| Appearance | Colorless, transparent liquid |
| Assay (GC) | ≥ 97.0% |
| Molecular Formula | C14H19F13O3Si |
| Molecular Weight | 510.364 g/mol |
| Boiling Point | 272.4±40.0 °C at 760 mmHg |
| Density (at 25°C) | 1.3±0.1 g/cm3 |
| Refractive Index | 1.349 |
Mechanism of Action
The unique functionality of Perfluorooctyl Triethoxysilane arises from its hybrid molecular structure, which enables a two-step surface modification process:
1. Silane Anchoring (Hydrolysis & Condensation): The triethoxysilane (-Si(OCH₂CH₃)₃) group is the "anchor." In the presence of moisture, these ethoxy groups hydrolyze to form reactive silanol (-Si-OH) groups. These silanols then condense with hydroxyl (-OH) groups present on the substrate surface (e.g., glass, metal oxides, minerals, textiles), forming stable, covalent Si-O-Si or Si-O-M (M=substrate) bonds [2]. This creates a firm and permanent attachment to the surface.
2. Fluorocarbon Chain Performance: The perfluorooctyl (C₈F₁₇) chain is the "performance" end. This long, perfluorinated chain has very low surface energy and is both oleophobic and hydrophobic. Once the molecule is anchored to the surface, this fluorocarbon chain orientates itself outwards, creating a dense, inert, and repellent monolayer that effectively resists water, oils, and soils.
Key Benefits & Functional Properties
- Durable Water & Oil Repellency: Provides excellent and long-lasting resistance to water and a wide range of oils and greases.
- Enhanced Stain Resistance: Treated surfaces become highly resistant to staining from liquids and dirt, simplifying cleaning and maintenance.
- Improved Powder Flow & Compatibility (Cosmetics): When used to treat cosmetic powders like mica, silica, or pigments, it makes them hydrophobic and lipophobic. This improves powder flowability, reduces clumping, and enhances compatibility with oil-based formulations in foundations, eyeshadows, and primers [3].
- Surface Protection: Protects substrates from environmental factors like moisture, corrosion, and dirt accumulation.
- Stable Covalent Bonding: Offers more durable performance than physical coatings or adsorbing agents.
Applications in Industry
Perfluorooctyl Triethoxysilane Liquid is a versatile surface treatment agent:
1. Cosmetics & Personal Care:
- Makeup: Used as a surface treatment for pigments and powders (e.g., mica) in foundations, eyeshadows, and blushes to provide long-wear, transfer resistance, and a smooth, non-greasy feel.
- Sunscreens & Skincare: Can be used to impart water resistance to formulations.
2. Textiles & Apparel: For creating high-performance water- and stain-repellent fabrics for outdoor gear and clothing.
3. Electronics: Used as a moisture-proof and anti-fingerprint coating for sensitive electronic components and displays.
4. Industrial Coatings: Applied to stone, concrete, metals, and glass to provide protective, easy-to-clean surfaces.
Frequently Asked Questions (FAQ)
Q: Is Perfluorooctyl Triethoxysilane safe in cosmetics?
A: When used as a surface treatment agent on powders and rinsed appropriately during the manufacturing process, the amount of residual free silane in the final cosmetic product is minimal. It is listed for use in cosmetics, but its safety is assessed as part of the final product formulation under regulatory frameworks like those of the EU and the U.S. FDA (for indirect food additives). Always consult current regulatory guidelines.
Q: Is this compound a PFAS?
A: Yes, it contains a perfluorooctyl group (C8), which classifies it as a per- or polyfluoroalkyl substance (PFAS). Regulatory scrutiny on certain long-chain PFAS is increasing globally. It is crucial to verify the compliance status of this specific compound for your intended market and application, as regulations are continuously evolving.
Q: How is it used to treat cosmetic powders like mica?
A: The liquid silane is typically diluted in a solvent and then mixed with the powder (e.g., mica) under controlled conditions with heat and agitation. The silane molecules coat the powder particles, bond to their surface, and render them hydrophobic/lipophobic. The treated powder is then often washed and dried.
Q: What is the INCI name?
A: The International Nomenclature of Cosmetic Ingredient (INCI) name is Perfluorooctyl Triethoxysilane.
Contact Us
Enhance your product performance with the advanced surface-modifying capabilities of Perfluorooctyl Triethoxysilane Liquid (CAS 51851-37-7). Ideal for creating long-lasting, water- and oil-repellent surfaces in cosmetics and industrial applications. Contact us today for technical data sheets, formulation guidance, and to discuss your specific needs.
E-mail: ella.zhang@huilinbio-tech.com.
References
- Mittal, K. L., & Pizzi, A. (Eds.). (2009). Silanes and Other Coupling Agents (Vol. 5). CRC Press.
- Van Ooij, W. J., et al. (2005). "Corrosion protection properties of organofunctional silanes-An overview." Tsinghua Science & Technology, 10(6), 639-664.
- Faulkner, E. (2021). Surface Treated Pigments. In Coloring the Cosmetic World (pp. 137-150). John Wiley & Sons, Ltd.
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