In the mixing and processing of high-temperature vulcanized silicone rubber and room-temperature vulcanized silicone rubber, the structural phenomenon brought by the silica black reinforcement system is a core technical challenge that affects the processing performance of the rubber compound and the quality of the final product. The active silicon hydroxyl groups on the surface of the gas-phase silica black will undergo physical and chemical reactions with the silicone rubber molecular chains, causing the rubber compound to gradually harden during storage, which seriously affects the processing fluidity and the final product performance. Our company's product, hydroxyl-terminated poly methyl silicone oil 1203B, as a high-activity structural control agent specially designed for the gas-phase silica black silicone rubber system, with a hydroxyl content of no less than 8% and a moderate low viscosity design, as well as comprehensive performance comparable to imported products, demonstrates significant industrial application value in silicone rubber mixing processing and organic silicon grafting modification fields.


I. Core Physical and Chemical Properties of the Product


Product hydroxyl-terminated poly methyl silicone oil 1203B is a colorless semi-transparent liquid with a viscosity not exceeding 35 square millimeters per second at 25 degrees Celsius. The hydroxyl content is no less than 8%, the flash point is no less than 66 degrees Celsius, and the moisture content is no more than 1%. This product is a solution specifically developed for the gas-phase silica black silicone rubber system. Its parameters have been carefully optimized: the hydroxyl content is at a relatively high level, providing sufficient reaction sites to react with the active hydroxyl groups on the surface of silica black; the viscosity is controlled within a low range, providing good dispersion and operability during mixing, facilitating metering and control during production; the flash point of no less than 66 degrees Celsius provides safety guarantees for the processing process.


II. Core Performance Advantages and Mechanism of Action


The core application value of product hydroxyl-terminated poly methyl silicone oil 1203B stems from its end hydroxyl group's passivation effect on the active sites on the surface of gas-phase silica black. In the silicone rubber system filled with gas-phase silica black, the mechanism of action of this product is as follows: the active hydroxyl groups at both ends of the molecule can form hydrogen bonds or undergo condensation reactions with the hydroxyl groups on the surface of silica black, effectively钝化 the active sites on the filler surface， thereby inhibiting the formation of hydrogen bonds between silica black particles and promoting the uniform dispersion of silica black in the silicone rubber.


In terms of processing performance improvement， this product can significantly reduce the Melt Flow Index (MFI) of the mixed rubber compound， improve the fluidity of the rubber compound， extend the safe storage time of the rubber compound， and reduce processing difficulties caused by structure formation. The higher hydroxyl content provides sufficient active sites for reaction， enabling it to achieve the desired structural control effect with a lower addition amount， while the low viscosity characteristic makes it easy to disperse during mixing and quickly and uniformly mix with silica black and silicone rubber raw materials.


III. Main Application Areas


Product hydroxyl-terminated poly methyl silicone oil 1203B， with its high activity and import substitution characteristics， can play an important role in the following key application areas. Specifically：


1. Mixing and processing of gas-phase silica black silicone rubber. This product is specifically designed for the gas-phase silica black silicone rubber system， effectively inhibiting the structure formation caused by silica black in the rubber compound， significantly reducing the MFI of the mixed rubber compound， extending the safe storage time of the rubber compound， improving the processing fluidity， and being particularly suitable for high-end silicone rubber products with high requirements for product transparency and mechanical properties.


2. Organic silicon grafting or modification. This product can be used for organic silicon grafting or modification， through the reaction of the end hydroxyl groups with isocyanate groups， carboxyl groups， etc.， introducing organic silicon segments into the main chain of organic polymers， improving the surface properties， weather resistance， and flexibility of organic materials， providing a basis for the development of new types of organic silicon materials with special functions.


3. Preferred alternative to imported products. This product can replace similar products from abroad， providing customers with a more cost-effective choice while maintaining comparable performance， helping to reduce reliance on imported raw materials.


4. Selection Reference and Application Suggestions


The hydroxyl content of product hydroxyl-terminated polydimethylsiloxane 1203B is not less than 8%, and it belongs to a high-activity specification. It is particularly suitable for gas-phase white carbon black reinforcement systems with high requirements for controlled structure. It is recommended to be added during the freezing and powdering stage of the mixing process, as this is when the contact with white carbon black is the most thorough and the structural control effect is the best. The dosage should be determined through experiments based on the type of white carbon black and the rubber compound formula. Compared to specifications with lower hydroxyl content, this product has better performance in terms of structural inhibition efficiency and white carbon black dispersion, and is suitable for the production of high-end silicone rubber products.


V. Packaging Specifications and Storage Conditions


Product hydroxyl-terminated polydimethylsiloxane 1203B is packaged in 200-kilogram iron drums. It should be placed in clean and dry containers and stored in a ventilated and dry warehouse to avoid contact with acids and alkalis.


VI. Quality Assurance and Industrial Chain Value


During the production process of product hydroxyl-terminated polydimethylsiloxane 1203B, a strict quality control system has been established. Key indicators such as product appearance, viscosity, hydroxyl content, flash point, and moisture are tested throughout the process to ensure consistency and reliability between batches. As silicone rubber products continue to develop towards higher value-added directions, the demand for structure control agents that are both highly active and easy to process is steadily increasing. This product, with a hydroxyl content not less than 8%, a moderate viscosity design, and a flash point not lower than 66 degrees Celsius, is becoming an important structure control agent option in the gas-phase white carbon black silicone rubber mixing process and the organic silicon modification field. It provides strong raw material support for promoting the product quality improvement in related industries.