Fluorine-containing silicone oil refers to silicone oil products in which the side groups of silicone oil are replaced by fluorine-containing groups, such as trifluoropropyl, which has the dual properties of silicone and organic fluorine, and has excellent weather resistance, high and low temperature resistance, Chemically stable and waterproof and oil-proof, it can be used as a lubricant, defoaming agent, surface treatment agent, release agent and additive, etc., and is used in aircraft, automobiles, machinery, chemicals, textiles and other fields.
lubricating
Fluorine-containing silicone oil can chemically adsorb on the surface of the substrate to form a molecular assembly film with an outer chemical composition of -CF3 and high hydrophobic and oleophobic properties, which can greatly reduce the friction coefficient of the substrate and make it have good resistance under low loads. Abrasive. Fluorinated silicone oil has the characteristics of high thermal stability, low volatility, antioxidant, oil resistance, solvent resistance, chemical reagent resistance, and wide operating temperature range. It can be used for a long time in most solvent and chemical environments, and is often used in some solvent-resistant , Corrosion-resistant harsh areas.
Fluorosilicone grease is prepared using fluorosilicone oil as the base oil. It can be used as a substitute for fluorine grease in some situations and is cheaper than fluorine grease.
defoaming
Fluorosilicone oil is neither water-soluble nor general oil-soluble, so it is often used for oil-based defoaming. It can be used in petroleum, textile, paint and ink industries, food processing and fermentation industries, and medical fields. Hydroxyl-terminated fluorosilicone oil contains hydrophilic terminal hydroxyl groups and is more suitable for defoaming in some aqueous systems.
Surface treatment agent for fabric, leather, paper, etc.
Fluorine-containing silicone oil is often used for waterproofing and anti-fouling finishing of fabrics, leather, etc. and is oil-repellent and solvent-repellent. In addition, fluorinated silicone oil can also be used for surface treatment of fillers to improve the compatibility between fillers and substrates.
Fluorosilicone oil-resistant glue
Polymethyltrifluoropropylsiloxane (PTFPMS) type fluorosilicone rubber is the earliest developed, earliest applied and most widely used fluorosilicone oil-resistant rubber. It has unparalleled comprehensive properties such as silicone rubber, fluororubber and nitrile rubber and other rubbers. Performance, it can work for a long time in the temperature range of -60~200℃, and its mechanical properties are similar to silicone rubber. However, PTFPMS fluorosilicone rubber is not suitable for use in polar solvents or highly corrosive fluids. The processing technology of high-temperature fluorosilicone rubber compound is relatively complicated. Currently, liquid fluorosilicone rubber has a tendency to replace the compound rubber.
Generally speaking, when the mole number of fluorine-containing links reaches 10%, oil resistance begins to show, and when the mole number of fluorine-containing links reaches more than 30%, better oil resistance is achieved.
other apps
Fluorosilicone oil can also be used in release agents to provide better release performance. In addition, it can also be used in products such as thermally conductive silicone grease.
Most of the fluorosilicone oils on the existing market are perfluorosilicone oils, which are relatively expensive. The traditional method of use is to add fluorosilicone oil as a functional additive to improve certain properties of the system. For example, in traditional addition silicone rubber, add Vinyl perfluorosilicone oil to improve the system's resistance to polar, non-polar solvents and oil resistance.
However, due to the relatively high polarity of fluorosilicone oil (the higher the fluorine content, the greater the polarity), it is not compatible with traditional vinyl silicone oil. Mixing evenly and letting it stand will also lead to delamination due to polarity differences. There may be differences in shrinkage after curing and cross-linking, resulting in poor mechanical properties. At the same time, due to compatibility issues, the fluorine groups cannot be evenly distributed throughout the system after curing and cross-linking, resulting in a significant reduction in modification performance.
Therefore, it is recommended to use vinyl-terminated low fluorine-containing fluorosilicone oil as the base material to prepare addition-type adhesives with anti-fouling flashover, resistance to polar, non-polar solvents, and oil resistance. . (Corresponding hydrofluorosilicone oil, methyl fluorosilicone oil, etc. can be prepared according to requirements). For condensation-type adhesives, it is recommended to use hydroxyl-terminated fluorosilicone oil with low fluorine content instead of traditional 107 silicone rubber as the base material to prepare industrial adhesives with corresponding properties.
For example, 5%wt perfluorosilicone oil is added to traditional liquid silicone rubber for modification, and vinyl fluorosilicone oil with a fluorine content of 5%wt is used as the base material. The mechanical properties are not deteriorated, and the fluorine groups are evenly distributed throughout the system after curing and cross-linking, achieving the desired modification properties.
Fluorosilicone oil is used in fields such as lubrication, release, and thermal conductive silicone grease. If perfluorosilicone oil is simply used, the effect will be poor due to its strong polarity and poor wettability. When perfluorosilicone oil is used as an additive, there are also problems with methyl silicone oil. Compatibility problems, using low fluorine-containing silicone oil instead of methyl silicone oil can avoid these problems.
Hydrofluorosilicone oil
