Definition of vinyl silicone oil:
Vinyl silicone oil, a siloxane polymer containing vinyl functional groups, has been widely used in many fields due to its unique properties.
Characteristics of vinyl silicone oil:
This oily substance is transparent, non-toxic, odorless, and free of mechanical impurities, while also possessing excellent stability. It is not only non-volatile and insoluble in water, but also has a low vapor pressure, high flash point and ignition point, and low freezing point. Vinyl silicone oil can maintain its stability and exhibit excellent performance in high temperatures or special environments. In addition, it also carries active vinyl groups, which can react with chemical substances containing active hydrogen groups or other active groups without releasing other low molecular weight substances during the reaction process. The deformation is small, providing the possibility for preparing various silicon products with special properties.
Common classification of vinyl silicone oil:
There are various types of vinyl silicone oil, such as vinyl terminated polydimethylsiloxane, vinyl terminated vinyl methyl siloxane dimethyl siloxane copolymer, etc. Among them, high vinyl silicone oil and multi vinyl silicone oil are common colloquial names. In addition, there are also types such as trimethyl terminated vinylmethylsiloxane dimethylsiloxane copolymers.
Common structural formulas for vinyl silicone oil:
Main raw materials and processes:
Vinyl silicone oil is mainly made from a mixture of dimethyl siloxane (DMC) and methyl vinyl ring, supplemented with tetramethyl divinyl disiloxane or hexamethyl disiloxane as end capping agents, and refined through catalytic ring opening polymerization equilibrium reaction.
Main parameters and indicators of the product:
Visually, vinyl silicone oil appears as a colorless or pale yellow transparent liquid. In terms of viscosity, its kinematic viscosity (25 ℃) does not exceed 1000mm2/s, while its dynamic viscosity may exceed 1000mm2/s as needed. In addition, the product strictly controls the vinyl content, including both mass and molar content, to ensure its reactivity and stability. At the same time, volatile matter is also one of the key indicators, requiring that the unit volatile matter after 3 hours of air blowing at 150 ℃ should not exceed 1.0%, and even electronic grade products are required to reach below 0.3%. In addition, the product also specifies the ring content, such as the unit content of D3-D6 or D3-D10, as well as specific requirements for export and electronic grade products.
● Purpose:
The base material of high-temperature vulcanized silicone rubber (HTV) is a mixture of ethylene based silicone oil, crosslinking agents, reinforcing agents, etc., to prepare high-temperature vulcanized silicone rubber raw rubber, which can significantly improve the strength and hardness of silicone rubber, while maintaining excellent stability and durability in high-temperature environments.
The main materials of liquid silicone rubber are ethylene based silicone oil, hydrogen containing crosslinking agents, platinum catalysts, etc., which can be used to prepare addition molded liquid silicone rubber with good fluidity and formability. It is widely used in the manufacturing of injection molded silicone rubber, electronic rubber, and thermal conductive rubber.
New material preparation: Vinyl silicone oil can react with organic materials such as polyurethane and acrylic acid to derive high-performance new materials such as weather resistance, aging resistance, and UV resistance, which play an important role in coatings, adhesives, and other fields.
Application in the field of electronics: The excellent sealing function provided by vinyl silicone oil makes it an ideal choice for protecting electronic components and parts from external pollution, and is widely used in products such as electronic adhesives and thermal conductive adhesives.
The main raw materials for release agents: In industrial production, release agents prevent product adhesion and improve demolding efficiency through materials such as vinyl silicone oil.
Other application areas: Vinyl silicone oil is widely used in cosmetics, lubricants, bearing lubricants, and other fields. Due to its unique lubricity and permeability, it is particularly prominent in cosmetics manufacturing.
● Knowledge Expansion:
The role of end vinyl and side vinyl: End vinyl is accompanied by the growth of molecular chains during crosslinking, which helps to improve the tear resistance of silicone rubber. The crosslinking process containing side vinyl groups can further enhance the crosslinking density, optimize the physical and mechanical properties of the vulcanized rubber, and adapt to applications with higher mechanical performance requirements.
The influence of vinyl content: The vinyl content is crucial for the performance of silicone rubber. Low content can lead to insufficient cross-linking density, affecting the hardness and tear strength of silicone rubber; If the content is too high, it may make the vulcanized rubber hard and brittle, reducing its aging resistance. Therefore, precise control of vinyl content is the key to preparing high-performance silicone rubber.
Consideration of molecular weight: Molecular weight is also an important factor affecting the properties of vinyl silicone oil. Appropriate molecular weight can ensure that silicone oil maintains stable physical and chemical properties in high-temperature environments, thereby meeting various application requirements.
Ethylene based silicone oil with lower molecular weight can reduce the viscosity of the rubber material, thereby improving its flowability, which helps to increase the crosslinking density of silicone rubber to a certain extent, endowing it with necessary tensile strength and hardness. Ethylene based silicone oil with higher molecular weight can enhance the elasticity and elongation at break of silicone rubber.