In the process of continuous evolution of organosilicon materials towards high-performance and functionalization, the active design of the end groups of the molecular chains has become a core factor determining the performance of downstream modified silicone oils, block copolymers, and addition-type silicone rubbers, etc. The product hydrogenated organosilicon oil 616 launched by our company, as a polydimethylsiloxane with active silicon-hydrogen bonds at both ends of the molecular chain, thanks to the high reactivity of the active silicon-hydrogen bonds at the end groups, has demonstrated significant industrial application value in numerous high-end application fields such as silicon-hydrogen addition reactions, block copolymer synthesis, addition-type silicone rubber chain extension and cross-linking, and organic polymer modification. It provides precise and efficient raw material support for organosilicon molecule design and performance regulation.


1. Core physical and chemical properties and multi-specification series of the product


Product hydrogenated organosilicon oil 616 is a colorless transparent liquid with a content of no less than 99%. Due to the active silicon-hydrogen bonds at the end groups of the molecule structure, it has higher reactivity than side-chain type hydrogenated organosilicon oil. It is an important key reactive intermediate. This product offers a series of specifications ranging from low viscosity to high viscosity: at a viscosity of 2 to 3 square millimeters per second, the molecular weight is 500 to 600, and the active hydrogen content is 0.5%; at a viscosity of 100 square millimeters per second, the molecular weight is 6,000, and the active hydrogen content is 0.04%; at a viscosity of 500 to 10,000 square millimeters per second, the molecular weight ranges from 17,200 to 62,700, and the active hydrogen content decreases from 0.01% to 0.003%. The density range is 0.90 to 0.97, and the refractive index ranges from 1.395 to 1.403.


2. Core reaction characteristics and application value


The application value of product hydrogenated organosilicon oil 616 stems from the precise positioning of the active silicon-hydrogen bonds at both ends of the molecular chain. Unlike side-chain type hydrogenated organosilicon oil, the silicon-hydrogen bonds of this product are only distributed at the ends of the molecular chain, which gives it the following unique advantages when participating in reactions:


In silicon-hydrogen addition reactions, the silicon-hydrogen bonds at both ends can react with unsaturated compounds to form addition reactions, precisely introducing reactive functional groups at the ends of the molecular chain, which is the basic intermediate raw material for manufacturing various end-reactive linear modified silicone oils. In block copolymer reactions, this product is a key intermediate for constructing (AB)n type block copolymers. By using the active silicon-hydrogen bonds at the end groups to gradually polymerize with vinyl groups of low polymers such as polyethers and polyesters, it can prepare block copolymers of specific sequence structures.


When used as a chain extender for addition-type silicone rubbers, this product reacts with vinyl silicone oil through the active silicon-hydrogen bonds to effectively increase the elongation at break, increase toughness, and reduce hardness. Unlike multi-hydrogen crosslinking agents, the hydrogenated organosilicon oil mainly extends the molecular chain in the crosslinking network rather than increasing the crosslink density, and is a key component for achieving soft, highly elastic silicone rubber products. At the same time, it can also be used as a crosslinking agent for addition-type thermosetting silicone rubbers, by constructing a three-dimensional network structure with vinyl silicone oil through the active silicon-hydrogen bonds.


3. Main application fields


Product hydrogenated organosilicon oil 616 can play a key role in the following high-end application fields thanks to its highly active end-group silicon-hydrogen bonds and series of specifications, including:


1. Synthesis of end-reactive linear modified silicone oils. This product is the basic intermediate raw material for manufacturing various end-reactive linear modified silicone oils. Through end-group silicon-hydrogen addition reactions, various organic functional groups such as amino, epoxy, hydroxyl, thiol, and methacryloyloxy can be introduced to prepare functional modified silicone oils such as end-aminosiloxanes and end-epoxysiloxanes, which are widely used in textile finishing agents, polyurethane leveling agents, and coating additives.


2. Key intermediate for block copolymer reactions. This product is a key intermediate for block copolymer reactions. It undergoes stepwise polymerization through silane addition with low polymers such as polyethers and polyesters that have vinyl groups at both ends. This process enables the production of (AB)n type block copolymer silicone oils with specific sequence structures, which are used for the synthesis of high-performance textile finishing agents such as ternary block silicone oils.


III. Chain extender and crosslinking agent for addition-type liquid silicone rubber. This product can be used as a chain extender for addition-type liquid silicone rubber, reacting with vinyl-end silicone oils to effectively increase the elongation at break of the cured rubber, enhance toughness, and reduce hardness. It can also be used as a crosslinking agent for addition-type thermosetting silicone rubber. Compared to side-chain type polyhydrogen crosslinking agents, the end-hydrogen chain extender does not increase the crosslinking density, thus enabling an increase in elongation at break and tear strength without significantly increasing hardness.


IV. Starting material for organic polymer modified materials. This product is the starting material for the modification reactions of plastics and resins. By introducing polysiloxane chain segments through end silicon-hydrogen bonds, it can effectively improve the surface hydrophobicity, weather resistance, and low-temperature flexibility of organic polymers.


V. Hydrophobic and moisture-proof treatment agent. The product also has the same hydrophobic and moisture-proof properties as methyl-containing hydrogen silicone oil. It can be used as a hydrophobic and moisture-proof additive for powders or surface coatings, as well as a waterproofing agent and softening agent for natural and synthetic fibers, silk, leather, etc.


IV. Packaging Specifications and Storage Conditions


The product, end-hydrogen silicone oil 616, is packaged in 200-liter plastic drums or iron drums, with a net weight of 190 kilograms. During storage, it must be kept in a ventilated and dry environment, and must not come into contact with acids or alkalis. The storage temperature range is from minus 45 to 45 degrees Celsius. During transportation, it should be protected from rain and sunlight, and stored as a hazardous material.


V. Quality Assurance and Industrial Chain Value


During the production process of product end-hydrogen silicone oil 616, a strict quality control system has been established. Key indicators such as product appearance, main content, viscosity, molecular weight, active hydrogen content, density, and refractive index are tested throughout the process to ensure consistency and reliability between batches. With the continuous growth in demand for end-terminal active intermediates in downstream fields such as organic silicone modified materials, addition-type silicone rubber, and high-performance textile finishing agents, product end-hydrogen silicone oil 616, with its purity not lower than 99% and the high reactivity of end-hydrogen silicon-hydrogen bonds, as well as its series of viscosity specifications, is becoming an important raw material option in the field of precise design and performance regulation of organic silicon molecules, providing strong raw material support for promoting product innovation and technological upgrading in the downstream industry.