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Perfluorooctyl triethoxysilane, also known as 1H,1H,2H,2H-Perfluorooctyltriethoxysilane, with molecular formula C14H19F13O3Si, CAS 51851-37-7, is an organic silicon compound with a special chemical structure. It usually appears as a colorless to light yellow transparent liquid at room temperature. The state of this liquid enables it to serve as a good solvent or reaction medium in many chemical reactions, which is conducive to the progress of chemical reactions. The molecule contains fluorocarbon chains and ethoxy groups, which make it both hydrophobic and hydrophilic. Therefore, it can dissolve in some organic solvents such as water, alcohol, ketones, etc., but its solubility may be affected by factors such as solvent type and temperature. It is a bifunctional compound.
The hydrolysis of functional groups containing silane groups releases low molecular weight alcohols, producing active silane alcohols that can chemically bond with hydroxyl, carboxyl, and oxygen-containing groups in many inorganic and organic substrates. Inert groups with low surface energy can endow the treated substrate with extremely low surface energy and poor wettability. Through appropriate solvent dilution and operation methods, molecules can penetrate hard and porous inorganic substrates up to several millimeters, achieving deep long-term hydrophobic and anti fouling protection.
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Chemical Formula |
C14H19F13O3Si |
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Exact Mass |
510 |
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Molecular Weight |
510 |
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m/z |
510 (100.0%), 511 (15.1%), 511 (5.1%), 512 (3.3%), 512 (1.1%) |
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Elemental Analysis |
C, 32.95; H, 3.75; F, 48.39; O, 9.40; Si, 5.50 |
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Perfluorooctyl triethoxysilane is a colorless and odorless liquid with hydrolyzable inorganic ethoxysilane groups and fluorinated alkyl chains. It can release low molecular weight alcohols after hydrolysis, and the resulting active silanol can chemically bond with hydroxyl, carboxyl, and oxygen-containing groups in many inorganic and organic substrates. This characteristic makes it an efficient surface modifier.
Cultural Relics and Brick and Stone Protection:
It can be used for waterproof, anti fouling, and windproof treatment of cultural relics and bricks. By forming a self-assembled single-molecule fluorosilicon film layer, it can effectively prevent the infiltration of moisture and pollutants, thereby extending the preservation time of cultural relics and maintaining their original appearance.
Protection of concrete products:
In concrete products, it can be used for waterproofing spots, whitening, and weathering treatment. It can form a dense protective film on the surface of concrete, preventing the invasion of moisture and harmful substances, thereby improving the durability and service life of concrete.
Ceramic and marble protection:
Ceramic and marble stone products are susceptible to erosion from moisture and pollutants during use. It can provide long-term waterproof and anti fouling protection, maintaining the beauty and performance of the stone.
Protection of Wood and Products:
Wood and its products are susceptible to moisture, decay, and insect infestation. It can penetrate into the interior of wood, forming a protective layer that effectively prevents the intrusion of moisture and harmful substances, thereby extending the service life of wood.
Metal surface treatment:
This product can be used for surface antioxidant treatment of metals such as copper, iron, aluminum, etc. By forming a dense fluorosilicon film layer, it can effectively prevent direct contact between oxygen and moisture and the metal surface, thereby slowing down the oxidation rate of the metal and extending its service life.
Improving agricultural mulching film:
This product can also be used as an agricultural film dropper or defogger to improve the effect, enhance the transparency and insulation performance of the film, and promote the growth of crops.
Natural fiber products:
Natural fiber products such as wool, cotton, and leather are susceptible to moisture and pollutants during use. Perfluorooctyl triethoxysilane can reduce the water holding capacity of these products, improve their surface hydrophobicity and anti fouling performance, thereby maintaining their dryness and cleanliness.
Automotive Glass Processing:
In the field of automobile manufacturing, it can be used for the treatment of automotive glass, forming coatings that are easy to clean, hydrophobic, and UV resistant. This coating can effectively prevent the accumulation of dirt on the glass surface, improve the clarity of driving vision, and reduce the exposure of ultraviolet rays, protecting the health of passengers in the car.
Synthesis of Fluorosilicone Resin:
It is one of the important synthetic materials for fluorosilicone resin.
By reacting with other silanes and fluorides, fluorosilicone resins with excellent properties can be prepared for various high-end application fields.
Additives for sol gel system:
Trifluorooctyl triethoxysilane can be used as an additive in the sol gel system to improve the performance and stability of the sol gel. During the preparation of the sol gel, it can form chemical bonds with the inorganic and organic components in the sol, thus enhancing the strength and durability of the sol gel.
Surface coating of pigments
During the pigment preparation process, it can be used for surface coating treatment of pigments. By forming a dense fluorosilicon film layer, it can improve the dispersibility and stability of pigments, prevent the aggregation and precipitation of pigment particles, and thus enhance the effectiveness of pigment use.
Chemical vapor deposition
It can also be used as a precursor for deposition materials in chemical vapor deposition processes. Through gas-phase reactions at high temperatures, it can form a uniform fluorosilicon film layer on the surface of the substrate, which is used to improve the performance of the substrate and meet special application requirements.
Organosilicon compounds and organosilicon materials made from them have many varieties and excellent properties, and have been widely used in industrial and agricultural production, emerging technology, national defense and military industry. Hydrosilylation reaction is one of the most important methods to generate Si-C bond in organosilicon chemistry. Many organosilicon monomers and polymers containing organic functional groups can be synthesized through hydrosilylation reaction.
We are the supplier of PERFLUOROOCTYL TRIETHOXYSILANE.
Remark: BLOOM TECH(Since 2008), ACHIEVE CHEM-TECH is the subsidiary of us.
The synthesis of Perflurooctyl Triethoxysilane requires multiple reactions. The following are the detailed steps and corresponding chemical equations for synthesizing Perflurooctyl Triethoxysilane using octafluorooctanoic acid as the starting material through multiple reactions:
1. Prepare raw materials
Starting substance: octafluorooctanoic acid
Other raw materials: triethoxysilane, ethanol, sodium hydroxide, etc.
2. Synthesis steps
Step 1: Reaction between octafluorooctanoic acid and ethanol
Add sodium hydroxide as a catalyst to anhydrous ethanol, heat to an appropriate temperature, then add octafluorooctanoic acid to ethanol and stir evenly. This step undergoes esterification reaction to generate ethyl octafluorooctanoate.
C8FCOOH + C2H5OH → NaOH + C8FCOOCH3 + H2O
Step 2: Hydrolysis of ethyl octafluorooctanoate
Hydrolyze the first step obtained ethyl octafluorooctanoate with water in an acidic environment to produce octafluorooctanoic acid and ethanol.
C8FCOOCH3 + H2O → C8FCOOH + C2H5OH
Step 3: Reaction between octafluorooctylic acid and triethoxysilane
Esterification reaction was carried out between the octafluorooctyl acid obtained in the second step and triethoxysilane at appropriate temperature to generate Perflurooctyl Triethoxysilane.
C8FCOOH + C6H15Si(OC2H5)3 → C8FCOO(OC2H5)3 + C6H15SiOH
Step 4: Alcoholysis reaction
Add ethanol and sodium hydroxide to the product obtained in the third step, heat to an appropriate temperature, and undergo an alcoholysis reaction to remove the hydroxide ions, resulting in the final product Perflurooctyl Triethoxysilane.
C8FCOO(OC2H5)3 + C2H5OH → NaOH + C8FCOOCH2CH3 + H2O
Through the above steps, Perflurooctyl Triethoxysilane can be synthesized from octafluorooctanoic acid as the starting material through multiple reactions.
Each step of the reaction requires controlling appropriate parameters such as temperature, catalyst, and reaction time to ensure the smooth progress of the reaction and the purity of the product. At the same time, it is necessary to pay attention to safe operating procedures and avoid direct contact with harmful substances or inhalation of harmful gases.
Fundamental Physicochemical and Molecular Structural Properties
This substance is abbreviated as POTS, with the standard chemical name 1H,1H,2H,2H-tridecafluorooctyltriethoxysilane, CAS No. 51851-37-7, molecular formula C₁₄H₁₉F₁₃O₃Si and molecular weight of 510.36. Its molecule features a bifunctional structure: the perfluorocarbon chain at one end delivers low surface energy, while the triethoxysilyl group at the other end endows hydrolytic bonding capacity.
It is a colorless, transparent low-viscosity liquid with a faint odor at ambient temperature. At 25 °C, its density is 1.33 g/mL, refractive index 1.344, boiling point 220 °C and flash point 110 °C. It is soluble in organic solvents including ethanol, toluene and isopropanol, and slightly soluble in pure water.
It undergoes mild hydrolysis without generating corrosive strong acids, and can be stored in sealed containers away from light, exhibiting superior stability compared with trichlorosilane-based fluorosilanes.
It possesses two core chemical characteristics. First, the silane terminus hydrolyzes to generate silanol groups, which can covalently bond with hydroxyl groups on substrates such as glass, ceramics, metals and silicon oxide to form a dense self-assembled monolayer.
Second, the exposed perfluoroalkyl chain drastically reduces surface energy and imparts hydrophobic, oleophobic, antifouling and anti-adhesive properties. The resultant coating demonstrates resistance to acid, alkali, UV aging and organic solvent erosion. Boasting excellent thermal stability, it does not decompose below 200 °C, making it widely applied for modification of low-surface-energy functional coatings.
Reaction Chemistry and Application Characteristics
The triethoxysilyl group undergoes hydrolytic crosslinking under mild conditions; film formation proceeds under weak acid or weak alkaline environments without high-temperature curing. It exhibits strong adhesion to inorganic substrates, and can serve as a coupling agent for fluororesins, fluororubbers and inorganic fillers to improve compatibility between two phases.
The molecule contains no strongly polar groups, and the cured film delivers outstanding dielectric properties, rendering it suitable for moisture-proof insulation of electronic components. Compared with conventional alkylsilanes, the fluorocarbon chain multiplies its antifouling and weather resistance, and the coating resists wetting by oil stains and water.
1. Theoretical Foundation Stage (1960s–1970s)
Fundamental research on organofluorine and organosilicon systems was completed. Researchers discovered that perfluoroalkyl groups possess extremely low surface energy, and hydrosilylation reactions can link fluoroolefins with silanes. Platinum-catalyzed hydrosilylation processes matured in the 1960s, providing a technical route for synthesizing long-chain fluoroalkylsilanes. Only short-chain fluorosilanes were synthesized in the early stage, and mass production of C8 perfluoroalkyl trialkoxysilanes remained unachieved.
2. Breakthrough in Target Product Synthesis (1980s–1990s)
European and American organosilicon manufacturers adopted perfluorooctylethylene and triethoxysilane as raw materials to synthesize POTS in laboratories for the first time via chloroplatinic acid-catalyzed hydrosilylation. Structural characterization and surface performance tests were carried out to verify its superhydrophobic and superoleophobic properties. Dow Corning and Evonik Degussa completed lab-scale trials in the same period and established a rectification purification process, enabling product purity above 98%.
Materials of Metric Roller Chain Sprocket
Large-scale mass production was realized around 2000, with Evonik (Germany) and Dow Corning (USA) launching commercial grades. Subject to environmental restrictions on PFOS-type perfluorinated compounds, POTS gained rapid popularity as a compliant alternative fluorosilane.
Catalytic processes were upgraded after 2010; supported platinum catalysts cut production costs, and domestic manufacturers achieved localized production. It has been widely adopted in optical glass waterproofing, stone water repellent treatment and fingerprint-resistant coatings for microelectronics, emerging as a mainstream fluorosilane surface modification agent.
Frequently Asked Questions
Is perfluorooctyl triethoxysilane safe?
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This ingredient is a member of a class of compounds called per- and polyfluoralkyl substances, or PFAS. With the many health effects noted for the few well studied PFAS substances, and hundreds of other PFAS in commerce lacking toxicity data, an appropriate degree of precaution is required to protect human health.
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