In the formulation design of room-temperature vulcanizing silicone rubber, silicone gel, and high-temperature vulcanized silicone rubber, the precise control of crosslinking density and network structure is the core factor determining the final hardness, flexibility, and comprehensive mechanical properties of the products. When traditional double-terminal vinyl silicone oil participates in crosslinking, it forms a dense network, making it difficult to achieve an ultra-soft touch. Our company's product, single-terminal vinyl silicone oil 22711, as a macromolecular monomer with one end being inert butyl and the other end being reactive vinyl, thanks to its asymmetric molecular structure and precise single reaction site characteristics, demonstrates significant application value in the fields of hardness regulation of room-temperature vulcanizing silicone rubber, flexibility modification of silicone gel, and performance optimization of high-temperature adhesives, providing a flexible and efficient solution for the molecular design of organosilicon elastomers.


I. Core Structural Characteristics and Physical Properties of the Product


Product single-terminal vinyl silicone oil 22711 is a colorless to light yellow transparent liquid with a relative molecular weight range of 1,000 to 10,000 daltons, a polydispersity index less than 1.50, and a viscosity of 10 to 100 millipascal-seconds at 25 degrees Celsius, with a free chlorine ion content of less than 20 ppm. The molecular chain of this product has one end of inert dimethylbutyl siloxyl and the other end of reactive dimethylvinyl siloxyl. Unlike ordinary vinyl silicone oil, each molecular chain has only one active site that can participate in crosslinking. This asymmetric structure enables it to act as the terminal of the network in the vinyl-hydrogen addition reaction, unlike double-terminal or side-chain vinyl silicone oils that form dense crosslinking nodes.


II. Core Performance Advantages


Product single-terminal vinyl silicone oil 22711, with its unique single-terminal reactive molecular structure, exhibits the following core performance advantages in the room-temperature vulcanizing silicone rubber system:


Precise control of hardness and modulus. Regular double-terminal vinyl silicone oil participates in crosslinking at both ends of the molecular chain, forming a dense network, resulting in higher hardness of the product. However, product single-terminal vinyl silicone oil 22711 only has one end that can participate in the reaction, grafted onto the crosslinking network, and the other end of the inert chain segment freely extends, providing internal plasticization and lubrication, significantly reducing the hardness and modulus of the vulcanized rubber and achieving an ultra-soft touch and high elongation.


Excellent compatibility and molecular weight customization. This product has good compatibility with double-terminal vinyl silicone oil, side-terminal vinyl silicone oil, and side-group vinyl silicone oil, and can be added in any proportion without phase separation. To meet the needs of customers for molecular design, the relative molecular weight and viscosity can be customized according to application requirements, meeting the requirements for hardness regulation and performance optimization.


III. Main Application Areas


Product single-terminal vinyl silicone oil 22711, with its precise single-reactive site characteristics and hardness regulation ability, can play a key role in the following high-end organic silicon application areas, specifically including:


1. Hardness and flexibility regulation of room-temperature vulcanizing silicone rubber. This product can be used as a hardness and modulus regulator for room-temperature vulcanizing silicone rubber, adjusting the hardness, modulus, and tensile elongation of the vulcanized rubber by adjusting its addition amount. It is suitable for soft-touch products such as artificial skin, toys, yoga mat surfaces, and handles.


2. Preparation of ultra-soft silicone gel. In electronic potting adhesives and medical silicone gel formulations, this product is a key component for preparing low-hardness and high-flexibility gels. The free chain segments formed after its participation in the reaction give the gel extremely low crosslinking density and excellent stress buffering performance, particularly suitable for stress buffering protection of precise circuits to avoid mechanical damage to components.


3. Plasticization modification of high-temperature vulcanized silicone rubber. In high-temperature vulcanized silicone rubber, this product can be used as a permanent plasticizer. Unlike physical blending with ordinary dimethyl silicone oil, which easily precipitates, this product is chemically bonded to the crosslinking network through vinyl groups, achieving permanent plasticization without the risk of migration and precipitation.


IV. Basic raw materials for the synthesis of special modified silicone oil. The vinyl group at the end of the product can be attached to other organic molecules through the silicon-hydrogen addition reaction, thereby synthesizing polyether-silicone copolymers, fluorosilicone modified silicone oil, and other special functional materials with special properties.


IV. Usage suggestions and dosage reference


When using the product, since only one vinyl group in each molecular chain participates in cross-linking, the vinyl group molar number must be included in the total vinyl content of the formula. Otherwise, it may lead to excessive cross-linking agent, causing the product to become sticky or not cure. It is recommended to determine the optimal substitution ratio through small-scale tests to achieve a balance between the target hardness and performance.


V. Packaging specifications and storage conditions


The product is provided in 1 kg, 5 kg, 25 kg, and 200 kg inner-coated iron drums and ton drums, sealed with nitrogen. After the product is sealed, it should be stored in a dry and cool place, avoiding contact with acids and alkalis, and keeping away from fire sources. Under the condition of intact original packaging and sealing, the effective storage period is six months.


VI. Quality guarantee and market value


The single-end vinyl silicone oil 22711 has established a strict quality control system during the production process. Key indicators such as product appearance, relative molecular weight, polydispersity index, viscosity, and free chlorine ion content are monitored throughout the process to ensure consistency and reliability between batches. As room-curing silicone rubber continues to develop towards ultra-softness, high elasticity, and precise modulus control, the demand for special modified additives with both hardness adjustment and permanent plasticizing functions is steadily increasing. The single-end vinyl silicone oil 22711, with its unique single-reactive-site molecular structure, precise hardness control ability, and flexible molecular weight customization services, is becoming an important functional additive option in the development of room-curing silicone rubber, silicone gel, and high-temperature adhesives, providing strong raw material support for the downstream industry to achieve the unification of soft touch and dimensional stability of the products.