Phenyltrimethoxysilane - A versatile organosilicon intermediate, empowering material upgrading in multiple fields

Phenyltrimethoxysilane (PTMS), with a CAS number of 2996-92-1, is a high-performance organosilicon intermediate that combines both organic functional groups and inorganic silicon-based properties. Its unique molecular structure endows it with excellent heat resistance, reactivity, and compatibility. It is widely used in various high-end industrial fields such as organosilicon synthesis, material modification, and surface treatment, serving as a core additive to promote the upgrading of material performance. With stable quality and diverse application scenarios, it has gained extensive recognition in industries such as chemical engineering and new materials.

Ⅰ. Unique molecular structure lays the foundation for core advantages

The molecular structure of phenyltrimethoxysilane precisely combines the dual characteristics of organic phenyl groups and inorganic siloxy groups, providing a fundamental guarantee for its excellent performance. The core structural parameters are as follows:
Molecular formula: C₉H₁₄O₃Si
Molecular weight: 198.29
Molecular structure: With a silicon atom at the center, one end is connected to a phenyl group (C₆H₅−), and the other end is connected to three methoxy groups (−OCH₃), forming a unique structure of "organic functional group - silicon - inorganic functional group".
Analysis of structural advantages: The introduction of the phenyl group endows the product with excellent heat resistance, hydrophobicity, and organic compatibility, enabling it to perfectly integrate with organic materials such as resins and rubbers; The three methoxy groups provide strong reactivity. Under appropriate conditions, they can be hydrolyzed to form silanol groups, which can easily form stable bonds with inorganic materials such as glass, metals, and inorganic fillers, achieving efficient "bridging" between organic and inorganic materials. This is also the core reason for its wide application in modification across multiple fields.

Ⅱ. Excellent Core Performance, Adapting to High-End Application Requirements

Thanks to its unique molecular structure, phenyltrimethoxysilane exhibits diverse and excellent properties, combining stability and functionality, which can meet the high-end application demands of different industries. Its core properties are as follows:

Excellent heat resistance and high-temperature resistance: The conjugated structure of the phenyl group effectively enhances the thermal stability of the molecule. Compared with ordinary alkyl silanes, its heat resistance is significantly better. The long-term service temperature can be adapted to various high-temperature processing scenarios. It can also effectively improve the thermal stability of other silane products, preventing materials from yellowing, degradation, performance attenuation and other issues in high-temperature environments, thus meeting the needs of high-temperature processed polymers and high-end coating fields.

High reactivity and controllability: The trimethoxy group (-OCH₃) in the molecule has good hydrolysis activity. It can be slowly hydrolyzed to form silanol (-SiOH) under slightly acidic conditions or appropriate catalytic conditions, and then undergo a polycondensation reaction to form a stable siloxane network structure. At the same time, the rate of hydrolysis and polycondensation reactions can be regulated by temperature and pH value, which is suitable for the processing technologies of different materials and facilitates industrial mass application.

Good compatibility and dispersibility: It has the structural characteristics of both organic phenyl and inorganic silicon groups, enabling it to have good compatibility with organic materials such as epoxy resin, polyurethane and rubber, and to efficiently combine with inorganic materials such as glass, ceramics and inorganic powders. When used for filler modification, it can significantly improve the dispersibility of inorganic fillers in organic systems, avoid agglomeration, and optimize the processing performance of materials and the quality of finished products.

Excellent hydrophobic and corrosion resistance: The hydrophobic property of the phenyl group, combined with the siloxane protective layer formed after hydrolysis, can effectively improve the hydrophobic performance of the material surface and isolate moisture erosion. At the same time, it has good chemical corrosion resistance, can resist the erosion of most acid and alkali media (except strong acids and alkalis), prolong the service life of materials, and is suitable for application needs in humid and complex corrosive environments.

Stable physical and chemical properties: The product is a colorless and transparent liquid with a purity of over 98% (some specifications ≥99%), no obvious odor, a density of 1.062g/mL (25℃), a refractive index of n20/D 1.468, a boiling point of 233℃, a melting point of -25℃, and a flash point of 99°F. It is easily soluble in organic solvents such as ethanol and benzene, insoluble in water, convenient for storage and transportation, chemically stable at room temperature, and has a shelf life of 1-2 years (which can be extended if re-inspection is qualified).

III. Wide range of application fields, empowering innovation and development in multiple industries

Phenyltrimethoxysilane, with its multiple excellent properties, is widely used as an organosilicon intermediate, modifier, and surface treatment agent in various fields such as organosilicon material synthesis, coatings and inks, composite materials, plastics and rubber, filler modification, automobile industry, electronics and semiconductors. Each application scenario is accompanied by practical application pictures to intuitively present its application value:

1. Field of silicone material synthesis - core raw materials, laying a solid foundation for quality

• As a key monomer and intermediate for synthesizing high-end organosilicon materials, it occupies an important position in the organosilicon industry. Through hydrolysis and polycondensation reactions, it can be used to prepare high-end organosilicon products such as phenyl silicone resins and phenyl silicone oils:
• When used in the synthesis of phenyl silicone resins, it can improve the heat resistance, weather resistance and adhesion of the resins, making them suitable for harsh environments such as high temperatures and outdoor conditions, and is widely used in high-temperature resistant coatings, insulating coatings, and high-end packaging materials; when used in the preparation of phenyl silicone oils, it can improve the lubricity, high-temperature resistance and compatibility of silicone oils, and is applied in fields such as high-end lubricating oils, release agents, and heat dissipation media for electronic components.

2. Field of surface treatment of inorganic fillers - modification to enhance efficiency and optimize processing performance

• It is an efficient surface treatment agent for inorganic fillers, suitable for surface modification of various inorganic powder fillers such as wollastonite, aluminum hydroxide, talc, and calcium carbonate, especially suitable for polymer systems that require high-temperature processing:
• Through surface coating treatment, the surface of inorganic fillers can obtain hydrophobicity and organic compatibility, effectively solving the problem of filler agglomeration, and improving their dispersion uniformity in organic systems such as plastics, rubber, and resins; at the same time, it can reduce the melt viscosity of polymers, improve the processing fluidity of materials, reduce processing energy consumption, and also enhance the mechanical properties (tensile strength, impact strength), heat resistance and water resistance of the finished products.

3. Coatings and Inks Field - Modification and Upgrading to Enhance Product Competitiveness 

• As a high-end modifier for coatings and inks, it can significantly optimize the comprehensive performance of products, addressing the pain points of ordinary coatings such as poor adhesion, weak weather resistance, easy yellowing, and insufficient water resistance. It is suitable for multiple high-end coating scenarios:
• When added to high-temperature resistant coatings, it can improve the heat resistance limit of the coatings, making them suitable for anti-corrosion protection of high-temperature components such as industrial equipment, boilers, and chimneys; when added to outdoor coatings, it can enhance weather resistance, resist ultraviolet rays, wind and rain erosion, and extend the service life of the coating; when added to high-end inks, it can improve the adhesion, wear resistance and gloss of the inks, making them suitable for precision printing, high-end packaging printing and other fields; at the same time, it can be used as a coating primer modifier to improve the bonding force between the coating and substrates (metal, glass, ceramics), avoiding delamination and peeling.

4. Plastic and Rubber Field – Performance Optimization to Expand Application Boundaries

• It is used for modifying plastic and rubber products, which can effectively make up for the defects of traditional plastics and rubbers such as poor heat resistance, insufficient toughness, and weak water resistance, improve product quality and added value, and expand their application scenarios:
• In the plastic field, it is compatible with various plastics such as PP, PE, and ABS, which can improve the heat resistance, impact toughness, and dimensional stability of plastics. It is used to produce plastic parts used in high-temperature environments (such as parts around automobile engines, electronic equipment casings); in the rubber field, it can improve the heat resistance, wear resistance, and aging resistance of rubber, and is used to produce high-end seals, high-temperature resistant rubber hoses, auxiliary materials for automobile tires, etc., so as to prolong the service life of rubber products. 

5. Pigment dispersion field - uniform dispersion to improve color quality

• As an efficient pigment dispersant, it can be used for surface treatment of various organic and inorganic pigments, solving problems such as pigment agglomeration, uneven dispersion, floating and blooming, and optimizing the application performance of pigments:
• After being treated with it, the pigment surface forms a hydrophobic protective layer, which not only significantly improves dispersibility, enabling uniform dispersion in coatings, inks, plastics and other systems, but also enhances the tinting strength and color stability of the pigment, reduces pigment usage, and lowers production costs; at the same time, it can improve the application performance of coatings and inks, avoid problems such as uneven color and sagging, and is suitable for fields such as high-end coatings, precision printing, and colored plastics. 

6. Automotive and Electronics Industry - High-end Adaptation to Facilitate Quality Upgrades

• Adapting to high-end manufacturing fields such as automotive and electronic semiconductors, it provides support for product quality upgrading with its properties of heat resistance, water resistance, insulation, and strong adhesion:
• In the automotive industry, it is used as an additive in automotive glass coatings, which can improve the adhesion, hydrophobicity, and weather resistance of glass coatings, reduce rainwater residue, and enhance driving safety. At the same time, it is used for material modification of automotive parts (such as seals, interior parts, and components around the engine), improving the heat resistance, wear resistance, and service life of the parts to adapt to the high-temperature and humid working environment of automobiles.
• In the field of electronic semiconductors, it can be used as a surface treatment agent for semiconductor wafers, improving the cleanliness and compatibility of the wafer surface and optimizing the packaging effect. Meanwhile, it is used in the modification of insulating coatings and heat dissipation media for electronic components, enhancing the insulation performance, heat dissipation efficiency, and stability of the components to meet the packaging and protection needs of high-end electronic devices and semiconductor chips. 

7. Other Special Fields - Multiple Adaptations to Expand Application Value

• In addition to the above core fields, phenyltrimethoxysilane can also be used in multiple special scenarios, leveraging its unique performance advantages:
• It can serve as a silane coupling agent to improve the interfacial bonding force between inorganic and organic materials, adapt to the production of composite materials (such as fiberglass-reinforced plastics), and enhance the mechanical properties and weather resistance of composite materials; it can be used to improve the thermal stability of other silane products, expanding the application scenarios of silane products; it can also act as a catalyst adjuvant in some organic synthesis reactions, improving reaction efficiency and product purity.

IV. Quality Assurance, Collaborating to Create Value

The phenyltrimethoxysilane we produce strictly adheres to industry standards, adopts advanced production processes, and controls product quality throughout the entire process to ensure stable product purity, physical and chemical properties, with all indicators meeting the application requirements of industrial grade and high-end grade. The product packaging specifications are complete, available in 5L, 10L, 25L, 210L iron drums or 1000L IBC containers. Customized packaging can be provided according to customer needs. The sealing performance is excellent, which can effectively isolate moisture and light, facilitating storage and transportation. At the same time, we provide comprehensive after-sales service and technical support, customize exclusive solutions according to customer application scenarios, help customers optimize production processes, improve product quality, and reduce production costs.