Vinyl silicone oil, as a siloxane polymer containing vinyl functional groups, plays an irreplaceable role in high-end manufacturing, electronic packaging, daily chemical materials and other fields due to its unique chemical structure and reactivity. This article systematically analyzes this special organic silicon material from the dimensions of definition, structure, performance, application, and development trends.

Vinyl silicone oil is an active polymer in which some methyl groups in the polydimethylsiloxane chain are replaced by vinyl groups (- CH=CH ₂). The molecular chain contains active vinyl groups and can participate in addition reactions. According to the position of the vinyl group, it can be divided into end vinyl silicone oil (such as Vi PDMS, where the vinyl group is located at both ends of the molecular chain) and side vinyl silicone oil (where the vinyl group is distributed on the side chain); Divided by viscosity into low viscosity (30-500cSt), medium viscosity (100-350cSt), and high viscosity (500-20000cSt) products; It is divided into electronic grade, cosmetic grade, industrial grade, etc. according to its purpose, to meet the customized needs of different scenarios.

Structure and Properties: Dual Advantages of Si-O Skeleton and Active Groups
Its main chain is composed of Si-O bonds with high bond energy (220 kJ/mol), endowing the material with excellent high temperature resistance (-50 ℃ to 250 ℃), weather resistance, and low surface tension characteristics; The vinyl groups with side chains or end groups endow them with reactivity. The physical properties are colorless/light yellow transparent liquid, non-toxic, odorless, and free of mechanical impurities. It is insoluble in water but soluble in organic solvents. Its low vapor pressure, high flash point (>200 ℃), and low freezing point (<-50 ℃) make it stable in extreme environments. In terms of chemical properties, vinyl can react with hydrogen containing silicone oil, polyurethane, acrylic acid, etc. under the action of platinum catalyst to generate weather resistant, UV resistant, high toughness silicone rubber, silicon gel or coating. The reaction has no low molecular by-products, small deformation, and is suitable for precision molding.

Regarding liquid silicone rubber, please refer to our website for details: IOTA Liquid Silicone Rubber