In the process of the high-performance development of thermosetting liquid silicone rubber and phenolic silicone resins, the vinyl-terminated reactive polysiloxane serves as the core component of the curing system. Its structure and quality directly determine the crosslinking characteristics, mechanical strength, and heat resistance of the products. Our company's product, phenolic vinyl silicone oil 252, with the chemical name of di-ethylene-vinyl-terminated phenyl methyl polysiloxane, is a linear phenyl-based silicone oil with vinyl termination. It demonstrates significant industrial application value in the fields of thermosetting phenolic silicone rubber, phenolic silicone resin dilution, and high-performance organic silicone composite materials, providing flexible and reliable raw material options for the performance design of high-end phenolic silicone products.


1. Product Series Specifications and Core Physical and Chemical Properties


Product phenolic vinyl silicone oil 252 offers four standard viscosity specifications, covering 100, 1000, 3000, and 5000 square millimeters per second, to meet the differentiated requirements for flowability and crosslinking density in different application scenarios. All specifications are colorless and transparent liquid, with a specific gravity ranging from 0.05 to 0.10, and the flash point significantly increases with viscosity, from over 100 degrees Celsius for the 100 specification to over 200 degrees Celsius for the 5000 specification, demonstrating excellent high-temperature safety.


The core parameters of this product - vinyl content and refractive index exhibit a regular change: the vinyl content of the 100 viscosity specification is 3.1% ± 1%, with a refractive index of 1.50 ± 0.01; the 1000 viscosity specification has a vinyl content of 1.5% ± 0.2%, with a refractive index of 1.52 ± 0.01; the 3000 viscosity specification has a vinyl content of 0.7% ± 0.1%, with a refractive index of 1.53 ± 0.01; and the 5000 viscosity specification has a vinyl content of 0.4% ± 0.1%, with a refractive index of 1.54 ± 0.01. As viscosity increases, vinyl content decreases and refractive index increases, following this regular pattern, providing precise selection basis for formulation designers.


2. Core Application Value and Functional Characteristics


Product phenolic vinyl silicone oil 252, as the vinyl component of thermosetting phenolic silicone rubber, has the reactive vinyl groups at both ends of its molecular chain that undergo a silicon-hydrogen addition reaction with hydrogen-containing silicone oil under the action of a platinum catalyst, forming a three-dimensional crosslinking network. By selecting different viscosity and vinyl content specifications, the crosslinking density, hardness, and elongation of the cured rubber can be precisely controlled.


As an active diluent for vinyl phenolic silicone resin, product phenolic vinyl silicone oil 252 can effectively reduce the viscosity of the resin system, improve processing fluidity, and its vinyl termini can participate in the curing reaction of the resin, achieving chemical bonding, avoiding the volatilization and precipitation of small molecule diluents during the curing process.


This product has excellent molecular-level compatibility with phenolic silicone rubber and phenolic silicone resin, based on the principle of similar solubility, can be uniformly dispersed in the matrix material, ensuring the uniformity of the crosslinking reaction and the consistency of the product performance.


3. Main Application Domains


Product phenolic vinyl silicone oil 252, with its series of specifications and excellent reaction compatibility, can play a key role in multiple high-end applications of phenolic organic silicon, specifically including:


1. The basic polymer of thermosetting phenolic liquid silicone rubber. Product phenolic vinyl silicone oil 252 can be used as the vinyl component of thermosetting phenolic liquid silicone rubber, reacting with hydrogen-containing crosslinking agents under platinum catalysis to form a cured product. By selecting different viscosity and vinyl content specifications, a series of phenolic silicone rubber products from low hardness and high elasticity to high hardness and high modulus can be prepared. The 100 viscosity specification is suitable for the preparation of low-viscosity potting and coating rubber, giving the material good flowability and wettability; 1. The viscosity specifications ranging from 1,000 to 3,000 are suitable for the production of general-purpose phenolic silicone rubber products, providing a balance between mechanical strength and elongation; the viscosity specification of 5,000 is suitable for high-strength structural components and thick products, offering better reinforcing effect and dimensional stability, and is applicable to applications such as aviation sealing parts, nuclear power valve sealing, and high-temperature pipe gaskets.


2. The active diluent of vinyl phenolic silicone resin. In the formulations of phenolic silicone resin coatings, potting materials, and composite materials, product phenolic vinyl silicone oil 252 can be used as an active diluent, effectively reducing the viscosity of the resin system and improving the construction and wetting performance. Its vinyl terminal group undergoes chemical bonding with the resin matrix during curing, becoming part of the cross-linked network, avoiding the negative impact of residual non-active diluents on the performance of the cured product, and is suitable for high-solid content phenolic silicone resin coatings and vacuum potting processes.


3. Plasticizer and modifier for phenolic silicone rubber. In high-temperature cured phenolic silicone rubber, product phenolic vinyl silicone oil 252 can be used as a plasticizer, its vinyl end group can participate in cross-linking during the curing process, achieving permanent plasticizing effect, without the risk of migration and precipitation. Introducing an appropriate low-viscosity specification product can effectively reduce the hardness of the rubber compound, improve flexibility and low-temperature performance, and is suitable for the formulation optimization of cold-resistant sealing parts and vibration reduction products.


4. Components of high-performance organic silicone pressure-sensitive adhesives. In the formulation of phenolic organic silicone pressure-sensitive adhesives, product phenolic vinyl silicone oil 252 can be used as a thickening component and cross-linking regulator, by adjusting the vinyl content and molecular weight, it can precisely control the peel strength and holding force balance of the pressure-sensitive adhesive, suitable for high-temperature adhesive tapes, electronic protection films, and special adhesives for aerospace applications.


5. Toughening and modification of phenolic organic silicone composites. In fiber-reinforced or filler-filled phenolic silicone resin composites, product phenolic vinyl silicone oil 252 can be used as a toughening modifier, its flexible silicon-oxygen chain segments effectively improve the impact resistance and fracture toughness of the composite material, while the vinyl terminal group ensures its chemical bonding with the base resin, ensuring the durability of the modification effect, suitable for aerospace composite structural components and high-temperature adhesives systems.


6. Cross-linking components for LED and optoelectronic device encapsulation materials. In the formulation of phenolic high-refractive index LED encapsulation glue, product phenolic vinyl silicone oil 252 can be used as a cross-linking component, its high refractive index characteristic (1.50 to 1.54) matches the optical design requirements of the encapsulation glue, the series of viscosity selection is convenient for rheological regulation of the encapsulation process, helping to improve the light output efficiency and encapsulation reliability of the device.


4. Packaging Specifications and Storage Recommendations


Product phenolic vinyl silicone oil 252 is available in two packaging specifications of 15 kilograms and 200 kilograms. It is packaged in coated iron drums to prevent direct contact of the product with metal, ensuring the purity and stability of the product during storage and transportation. The product should be stored in a well-ventilated and cool place, away from fire sources and strong oxidants, avoiding direct sunlight, and keeping the container sealed to prevent water or impurities from entering.


5. Quality Assurance and Market Value


Product phenolic vinyl silicone oil 252 has established a strict quality control system during production, monitoring key indicators such as appearance, viscosity, refractive index, vinyl content, specific gravity, and flash point throughout the process, ensuring consistency and reliability between batches. With the continuous growth in the demand for high-performance phenyl organic silicone materials in strategic fields such as aerospace, nuclear energy equipment, optoelectronic information, and new energy vehicles in China, the product phenyl vinyl silicone oil 252, as the core active component of condensable phenyl silicone rubber and phenyl silicone resin, is becoming an important raw material option for the performance design of phenyl organic silicone products. It provides strong support for promoting the independent innovation and industrialization development of high-performance phenyl organic silicone materials in China.