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 macromer with one end being inert butyl and the other end being reactive vinyl, exhibits important application value in the fields of hardness regulation in room-temperature vulcanizing silicone rubber, flexibility modification in silicone gel, and performance optimization of high-temperature adhesives, providing a flexible and efficient solution for the molecular design of organosilicon elastomers.


I. Core Physical and Chemical 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. The product has a molecular chain with one end being inert dimethylbutyl siloxyl and the other end being reactive dimethylvinyl siloxyl. Unlike ordinary vinyl silicone oil, each molecular chain has only one active site that can participate in crosslinking. This asymmetric "tadpole" structure and precise single-reactive site characteristics enable it to play an important role in the hardness regulation of room-temperature vulcanizing silicone rubber, the flexibility modification of silicone gel, and the performance optimization of high-temperature adhesives, providing a flexible and efficient solution for the molecular design of organosilicon elastomers.


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 reaction, grafted onto the crosslinking network, and the long inert chain segments at the other end freely extend, 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. The product has good compatibility with double-terminal vinyl silicone oil, side-chain vinyl silicone oil, and side-group vinyl silicone oil, and can be added in any proportion without phase separation. To meet the molecular design requirements of customers, the relative molecular weight and viscosity can be customized according to application needs, meeting the requirements for hardness regulation and performance optimization.


Reduced free chlorine ion content. The free chlorine ion content of the product is less than 20 ppm, with little interference to the activity of platinum catalyst in the vulcanization reaction, helping to ensure the stability of the vulcanization reaction and the consistency of product quality.


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 organosilicon application areas, specifically including:


1. Hardness and flexibility regulation of room-temperature vulcanizing silicone rubber. The product has excellent compatibility with double-terminal and side-chain vinyl silicone oil and can be used as a hardness and modulus regulator for room-temperature vulcanizing silicone rubber. By adjusting the addition amount, the hardness, modulus, and elongation at break of the vulcanized rubber can be finely regulated. 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, product single-terminal vinyl silicone oil 22711 is a key component for preparing low-hardness and high-flexibility gels. The free chain segments formed after 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. III. Plasticizing modification of high-temperature vulcanized silicone rubber. In high-temperature vulcanized silicone rubber, this product can be used as a permanent plasticizer. Unlike the physical blending with ordinary dimethyl silicone oil which easily causes different precipitates, this product is chemically bonded to the cross-linked network through the terminal vinyl group, achieving permanent plasticization without the risk of migration and precipitation, effectively improving the long-term stability and surface cleanliness of the products.


IV. Peroxide free radical crosslinking system. Besides the silicon-hydrogen addition reaction, this product can also undergo free radical crosslinking and curing under the action of peroxides, suitable for the performance adjustment of peroxide vulcanization systems, and broadening its application range in different silicone rubber vulcanization processes.


V. Basic raw material for special modified silicone oil. The terminal vinyl group of the product is a highly reactive anchor point. It can be connected with other organic molecules through the silicon-hydrogen addition reaction to synthesize special functional materials such as polyether-silicone copolymers and fluorosilicone modified silicone oil, which are used in polyurethane foam leveling agents, textile softeners, and coating leveling agents, etc.


IV. Usage suggestions and dosage reference


When using the product single-end vinyl silicone oil 22711, since only one vinyl group in each molecule chain participates in crosslinking, the vinyl moles must be included in the total vinyl content of the formula. Otherwise, it may lead to excessive crosslinking agent and make the product sticky or not cure. It is recommended to determine the optimal substitution ratio through small-scale tests to achieve a balance between target hardness and performance.


V. Packaging specifications and storage conditions


The product single-end vinyl silicone oil 22711 is provided in 1 kg, 5 kg, 25 kg, 200 kg inner-coated iron drums and ton barrels, 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, the effective storage period is six months.


VI. Quality guarantee and market value


The product single-end vinyl silicone oil 22711 has established a strict quality control system during production. Key indicators such as product appearance, relative molecular weight, polydispersity index, viscosity, and free chlorine ion content are tested throughout the process to ensure consistency and reliability between batches.


As the addition-type 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 plasticization functions is steadily increasing. The product single-end vinyl silicone oil 22711, with its unique single-reactive-site molecular structure, precise hardness regulation ability, and flexible molecular weight customization services, is becoming an important functional additive option in the development of addition-type silicone rubber, silicone gel, and high-temperature adhesive formulations, providing strong raw material support for the downstream industry to achieve the unity of soft touch and dimensional stability of the products.