What is vinyl silicone oil?

Compared with methyl silicone oil, vinyl silicone oil is relatively unfamiliar to many people, but they are very familiar with silicone raw materials and silicone products in the industry, because vinyl silicone oil is commonly used in liquid silicone. Commonly used vinyl silicone oil is divided into vinyl terminated silicone oil (Vi-PDMS) and vinyl terminated side chain vinyl silicone oil (Vi-PDVS).

The preparation process and reaction mechanism of vinyl silicone oil are similar to those of dimethyl silicone oil: a small number of methyl groups (Me) in polydimethylsiloxane are replaced by vinyl groups (Vi) to form reactive polymethyl vinyl silicone oxane. It generally uses octamethylcyclotetrasiloxane, tetramethyltetravinylcyclotetrasiloxane as raw material, and tetramethyldivinyldisiloxane or hexamethyldisiloxane as end-capping agent. It is formed by a ring-opening equilibrium reaction under the catalysis of acid or base. Therefore, vinyl silicone oil is a kind of polyorganosiloxane with a chain structure of different degrees of polymerization, and its appearance is liquid and fluid.

The main characteristics of vinyl silicone oil are colorless, odorless, non-toxic, non-volatile liquid, insoluble in water, miscible with benzene, dimethyl ether, methyl ethyl ketone, tetrachlorocarbon or kerosene, slightly soluble in acetone, Ethanol. It has a small vapor pressure, high flash point and ignition point, and low freezing point; as the number of segments n is different, the molecular weight increases and the viscosity increases, so this vinyl silicone oil can have various viscosities.

So where is vinyl silicone oil used?

1. It is used as the base material for the production of high temperature vulcanized silicone rubber (HTV), mixed with crosslinking agent, reinforcing agent, colorant, structure control agent, anti-aging agent, etc. to prepare high temperature vulcanized silicone rubber raw rubber;

2. It is used to make liquid silicone rubber, which is the main material of injection thermoforming silicone rubber;

3. Vinyl silicone oil reacts with various organic materials such as polyurethane and acrylic acid, and can be made into new materials with better performance (weather resistance, aging resistance, UV resistance, enhanced toughness, etc.), such as various modified coatings;

4. Silicone emulsion (it is a form of silicone oil, that is, emulsified silicone oil.) There are mainly silicone oil fabric softening and finishing agents; silicone oil emulsion type defoaming agent: it is one of the most widely used and large amount of silicone defoamer. A defoamer.

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