Silicone oil, as a type of linear polysiloxane that maintains a liquid state at room temperature, is an indispensable component of silicone products. It has a wide variety of types and applications, bringing convenience and efficiency to many industries. According to the different substituent groups on the polysiloxane chain, silicone oil can be divided into various types such as methyl silicone oil, phenyl silicone oil, ethyl silicone oil, hydroxyl silicone oil, amino silicone oil, hydrogen containing silicone oil, vinyl silicone oil, polyether modified silicone oil, fluorosilicone oil, etc. These different types of silicone oils each have unique application characteristics that can meet the needs of different fields.
Next, we will delve into several representative silicone oil varieties to better understand their unique properties and applications.

1. Dimethyl silicone oil
Dimethyl silicone oil, as the most well-known type of silicone oil, is not only used in the largest amount in industrial production, but also has a wide range of applications.

2. Phenyl silicone oil
Phenyl silicone oil, as a variant of dimethyl silicone oil, is a type of silicone oil synthesized by partially replacing the methyl group with a phenyl group. Its classification is based on the content of phenyl groups, which can be specifically divided into low phenyl silicone oil (phenyl mole fraction 5% to 10%), medium phenyl silicone oil (phenyl mole fraction 25%), high phenyl silicone oil (phenyl mole fraction 45%), high phenyl low polymerization degree silicone oil (phenyl mole fraction above 45%), and cross-linked phenyl silicone oil.

3. Ethyl silicone oil
Ethyl silicone oil is synthesized through a series of chemical reactions, including hydrolysis and condensation of ethyl ethoxysilane in hydrochloric acid to form polydimethylsiloxane. After molecular rearrangement and vacuum distillation, a series of ethyl silicone oils with different viscosities were obtained. These silicone oils have the characteristics of low volatility, low surface tension, non toxicity, non corrosiveness, and aging resistance, and can be adjusted to different viscosities according to actual needs. Therefore, they are often used as insulation materials in the electrical industry, as lubricants in precision instruments and meters, and are also important components of hydraulic oil and special lubricants.

4. Hydroxy silicone oil
Hydroxysilicone oil plays an important role in the production process of room temperature silicone rubber. As a structural control agent, it can effectively regulate the molecular structure and properties of silicone rubber. In addition, hydroxyl silicone oil can also be used as a chain extender for synthesizing other products, further expanding its application range by reacting with other chemicals.

5. Amino silicone oil
Amino silicone oil is a key component of textile softening agents, which can significantly enhance the softness of textiles and give them good hand feel and wash resistance.

6. Vinyl silicone oil
Vinyl silicone oil is an important basic compound for preparing additive liquid glue and silicon gel.

7. Modified silicone oil
Among various types of silicone oil, polyether modified silicone oil stands out for its wide range of applications. This silicone oil is often used as a foaming agent, fiber oil agent, fabric finishing agent, and provides key raw materials for industries such as cosmetics, coatings, and pesticides. On the other hand, fluorosilicone oil exhibits excellent weather resistance, lubricity, and oleophobicity by combining the dual advantages of siloxane and fluorocarbon compounds. Therefore, it plays an important role in friction fields such as aerospace, automotive, mechatronics, and electronic machinery.

8. Application in the daily chemical industry:
In the daily chemical industry, modified silicone oil plays a crucial role. Its excellent lubricity and softness make it a key ingredient in cosmetics, skincare products, and other products, giving them a silky touch and long-lasting moisturizing effect. Meanwhile, modified silicone oil is often used as a fiber oil agent and fabric finishing agent to improve the hand feel of fibers and fabrics, enhance their anti-static and wear resistance.
Organosilicon lotion is widely used in cosmetics. Its addition can endow cosmetics with lubricating properties and enhance their resistance to sunlight and ultraviolet rays. In addition, the lotion can also improve the air permeability of the product, and at the same time, the hydrophobicity of silicone oil can further enhance the waterproof and sweatproof effect of cosmetics.

9. Applications in the textile industry:
Organosilicon lotion also plays an important role in the textile industry. Its lubricating properties make textiles smoother during processing, while its ability to enhance resistance to sunlight and ultraviolet radiation also helps protect the color and texture of textiles. In addition, the lotion can also improve the permeability of textiles, making them more comfortable and durable.

Silicone oil plays multiple roles in the textile and clothing industry, serving as a softener, lubricant, waterproofing agent, and finishing agent. It can also work synergistically with various functional additives such as waterproofing agents, flame retardants, anti-static agents, and color fixing agents. In order to meet the high-end demand for textiles, chemical product manufacturers continue to develop new silicone oils that are compatible with dyeing and bath technology, while enhancing the coolness and feel of fabrics. In addition, there is a type of organic silicon darkening agent that can endow fabrics with excellent darkening effects and has good storage stability, without affecting color fastness and hand feel.

Moreover, the application fields of organosilicon are constantly expanding. For example, it can be combined with polyurethane to provide coating protection for fabrics; Polymerization with acrylic acid to achieve printing technology on fabrics; And it can be fused with organic fluorine to form a waterproof coating on the surface of the fabric. These innovative applications will further promote technological progress and product upgrades in the textile industry.

10. Mechanical field
In the field of machinery, organosilicon also demonstrates its unique value. It can not only be used as a lubricant to reduce friction and wear of mechanical components, extend the service life of equipment, but also as a sealing material to effectively prevent leakage problems of mechanical equipment. In addition, the weather resistance and electrical insulation properties of organosilicon also make its application in the mechanical field more extensive.
Damping and shock absorption: Silicone oil plays an important role in fields such as motors, electrical appliances, and electronic instruments. It is not only resistant to temperature and arc corona, but also has insulation properties such as corrosion resistance, moisture resistance, and dust prevention. In addition, silicone oil is widely used as an impregnating agent in equipment such as transformers, capacitors, and scanning transformers for televisions. Silicone oil is often used as a liquid shock-absorbing and damping material in precision machinery, instruments, and meters. Its shock-absorbing performance is less affected by temperature and is particularly suitable for situations with strong mechanical vibrations and large environmental temperature changes, such as in aircraft and automotive instruments.

Thermal conductivity: Thermal conductive silicone grease plays a crucial role in device heat dissipation due to its unique properties. It is made from silicone oil as raw material through heating, pressure reduction, grinding and other processes, and has excellent thermal conductivity, high temperature resistance, aging resistance and waterproof properties. Between the CPU and the heat sink, the thermal grease can exhibit a semi liquid state, fully filling the gaps and enhancing heat conduction. In addition, thermal conductive silicone has also received much attention, and its unique adhesive force makes it perform well in certain applications.
Cutting fluid: The addition of silicone oil to the cutting fluid effectively exerts its lubricating and defoaming effects, improving cutting efficiency.
Demoulding: The non adhesiveness of silicone oil to rubber, plastic, metal, etc. makes it an ideal demoulding agent. In the molding process of rubber and plastic products, silicone oil can easily demold while maintaining the cleanliness, smoothness, and clear texture of the product surface.

11. Applications in the medical and food industries
Silicone oil also plays an important role in the medical and food industries. Due to its colorless, odorless, and good chemical stability, silicone oil is often used as a lubricant for medical rubber products in the medical field, such as surgical gloves and medical catheters. Meanwhile, in the food industry, silicone oil is often used as a coating for food packaging materials to improve their moisture and dust resistance, ensuring the freshness and safety of food.
The commonly used medical silicone oil is mainly polydimethylsiloxane, which is often made into anti bloating tablets and aerosols for treating pulmonary edema due to its defoaming properties. In abdominal surgery, it can also be used as an anti adhesive to prevent intestinal adhesions. At the same time, in gastroscopy examination, it can also be used as a gastric acid defoamer and lubricant for some medical surgical instruments.
In addition, silicone oil is widely used in the food industry. For example, it can be used as organosilicon defoamer for food industry to effectively inhibit foam during fermentation and sugar production. The emulsified products of food specific polysiloxane resin, as well as other directly usable oil-based products, are suitable for this type of defoaming application.
In addition, silicone grease is a type of organic silicone lubricant made by thickening food grade silicone oil with inorganic thickeners and refining it with various additives such as antioxidant and anti-corrosion agents. It is designed specifically for the sealing and lubrication of food processing equipment, and does not contain any toxic substances or heavy metals, ensuring the safety and harmlessness of food.
And silicone oil paper, as a commonly used packaging paper, has a three-layer structure including base paper, film coating, and silicone oil. Due to its high temperature resistance, moisture resistance, and oil resistance, silicone oil paper is often used for packaging in the food industry.

12. Surface treatment
Silicone oil also plays an important role in surface treatment. It can serve as a lubricant and anti sticking agent, effectively improving the surface properties of materials, enhancing their lubricity and anti sticking properties. In addition, silicone oil can also be used to prepare various surface treatment agents, such as silicone oil emulsions and silicone oil resins, which are widely used for surface treatment of materials such as metals, plastics, and rubber to improve their corrosion resistance and wear resistance.
Silicone oil has excellent performance in waterproofing and anti fouling of glass fiber materials, and its waterproof performance is quite outstanding. After applying silicone oil to building materials, it can not only improve the material's resistance to wind erosion, but also enhance its hydrophobicity. Specifically, adding 0.1% to 0.15% (mass fraction) silicone oil lotion or higher concentration of solid content in the mortar can significantly improve the workability and fluidity of the mortar, and show the above characteristics. In addition, materials such as asbestos, cement, and gypsum board can also be treated with silicone oil.

13. Application of silicone oil as defoamer
Silicone oil not only performs well in waterproofing and stain prevention, but is also often used as a defoamer. Its unique chemical properties enable it to exhibit excellent defoaming effects in many fields. By adding appropriate silicone oil, the foam problem in the production process can be effectively suppressed and eliminated, and the production efficiency and product quality can be improved.
Organic silicone oil, as a defoamer, has a wide range of applications. It plays an excellent role in defoaming in multiple processes of textile printing and dyeing, such as sizing, desizing refining, bleaching, and dyeing. At the same time, silicone oil is often used to inhibit and eliminate foam in drilling, oil and gas separation, demulsification, oil refining and other sections of the petrochemical industry, as well as in lubricating oil and cutting fluid. In addition, its defoaming effect is also significant in the paper industry, coating and ink industry, and detergent industry. Moreover, in the food industry, organosilicon defoamers also play an indispensable role.

14. Other applications
In addition to its wide applications in textile printing and dyeing, petrochemical industry, and other fields, organic silicone oil has many other uses. It can be used as an additive for silicone rubber to enhance its performance; At the same time, as a coating leveling agent, it can improve the construction performance of coatings; In addition, silicone oil can also be used as an anti-static agent and surfactant to improve the quality and performance of products. Therefore, organic silicone oil plays an indispensable role in various fields of daily life and industrial manufacturing.