In the mixing and processing of high-temperature vulcanized silicone rubber (HTV) and room-temperature vulcanized silicone rubber (RTV), the "structuring" phenomenon brought by the silica reinforcement system is a long-term technical challenge that affects the processing performance and product quality of the rubber compound. The active silicon hydroxyl groups on the surface of the gas-phase silica have a physical-chemical interaction with the silicone rubber molecular chains, causing the rubber compound to gradually harden and lose its plasticity during storage, which seriously affects the processing fluidity and the final product performance. Our company's product, high-hydroxy silicone oil 1203D, as a highly active structure control agent specifically designed for the gas-phase silica rubber system, with its precise viscosity and hydroxyl content balance design, high flash point characteristics, and comparable comprehensive performance to imported products, demonstrates significant industrial application value in silicone rubber mixing and processing, organic silicone grafting modification, and other fields, providing high-performance import substitution solutions for customers in various industries.


I. Core Physical and Chemical Properties of the Product


Product high-hydroxy silicone oil 1203D is a colorless semi-transparent liquid with a viscosity of 38 to 45 square millimeters per second at 25 degrees Celsius, a hydroxyl content of 3.6% to 4.5%, and a flash point of no less than 107.2 degrees Celsius, with a moisture content of no more than 0.5%. This product is a solution specifically developed for the gas-phase silica rubber system, and its parameters have been carefully optimized: the hydroxyl content is at a relatively high level, providing sufficient reaction sites for the active hydroxyl groups on the silica surface to react with; the viscosity is moderate, providing good dispersion and operability during mixing; the flash point of up to 107.2 degrees Celsius provides a higher safety margin for high-temperature processing conditions.


II. Core Performance Advantages and Mechanism of Action


The core application value of product high-hydroxy silicone oil 1203D stems from its end-hydroxyl group's inhibitory effect on the structuring of gas-phase silica rubber. Studies have shown that the inhibitory effect of hydroxy silicone oil on the structuring of silicone rubber is superior to that of methoxy silicone oil and dimethyl diethoxy silicone oil and other types of structure control agents. A dosage of about six parts can achieve a good inhibitory effect, effectively reducing the crosslinking degree, hardness, and tensile strength of the mixed rubber, while increasing the elongation at break and extending the safe storage time of the rubber compound.


In the silicone rubber system filled with gas-phase silica, the mechanism of action of this product is manifested in multiple aspects: 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 the silica filler, effectively inhibiting the formation of hydrogen bonds between the filler particles, promoting the uniform dispersion of silica in the silicone rubber, and reducing the tendency of silica agglomeration.


In terms of high-temperature processing adaptability, the product's flash point of no less than 107.2 degrees Celsius enables it to adapt to the 140 to 150 degrees Celsius high-temperature processing conditions during silicone rubber mixing without affecting the structure control effect due to volatilization loss.


III. Main Application Areas


Product high-hydroxy silicone oil 1203D, with its high activity and import substitution characteristics, can play an important role in the following key application areas, specifically including:


1. Mixing and processing of gas-phase silica rubber. This product is a structure control agent specifically designed for the gas-phase silica rubber system, which can effectively inhibit the structuring caused by silica in the rubber compound, significantly reduce the Melt Index of the mixed rubber, extend the safe storage time of the rubber compound, improve processing fluidity, and be particularly suitable for high-end silicone rubber products with high requirements for product transparency and mechanical properties.


2. Organic silicone grafting or modification. This product can be used for organic silicone grafting or modification, by reacting with functional groups such as isocyanate groups and carboxyl groups, introducing organic silicone segments into the main chain of organic polymers, improving the surface properties, weather resistance, and flexibility of the organic materials.


3. Preferred solution for replacing imported products. This product can replace similar products from abroad. Under the condition of comparable performance, it provides customers with a more cost-effective choice, which helps to reduce reliance on imported raw materials.


IV. Selection Reference and Application Suggestions


The hydroxyl content of product high hydroxyl silicone oil 1203D is 3.6% to 4.5%, which belongs to a high activity specification. It is suitable for the reinforcing system of gas-phase white carbon black with high requirements for structured control effect. It is recommended to be added during the freezing and powdering stage of the mixing process. At this time, 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 with the low hydroxyl content specification, this product has better performance in terms of structured inhibition efficiency and white carbon black dispersibility. It is suitable for the production of high-end silicone rubber products.


V. Packaging Specifications and Storage Conditions


Product high hydroxyl silicone oil 1203D 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 Industry Chain Value


Product high hydroxyl silicone oil 1203D has established a strict quality control system during the production process. 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 and precision, the demand for structured control agents with high activity and high-temperature adaptability is steadily increasing. This product, with its 3.6% to 4.5% high hydroxyl content, moderate viscosity design, and flash point of no less than 107.2 degrees Celsius, is becoming an important structured control agent option in the gas-phase white carbon black silicone rubber mixing process and organic silicon modification fields. It provides strong raw material support for promoting the product quality improvement and performance upgrade of related industries.