Silicon oil usually refers to linear polysiloxane that remains liquid at room temperature. It is a type of silicone product with many varieties and a wide range of applications. According to the different classifications of substituent groups on the polysiloxane chain, silicone oil can be divided into: methyl silicone oil, phenyl silicone oil, ethyl silicone oil, hydroxyl silicone oil, amino silicone oil, hydrogenated silicone oil, vinyl silicone oil and polyether modified silicone oil. , fluorosilicone oil and many other types.
Based on the types of organic groups, the corresponding application characteristics are as follows:
The following describes several representative types of silicone oil varieties:
1. Dimethicone
Dimethyl silicone oil is the most common type of silicone oil, with the largest dosage and widest application range; in China, the trade name of methyl silicone oil is 201 series, and the product brands of Dow Corning in the United States are DOWCORNING and XIAMETER. The models include PMX-200 series; the brand name of Germany’s Wacker Company is the AK series; the brand name of Japan’s Shin-Etsu Company is the KF series. China’s local methyl silicone oil manufacturers include: Blue Star Jiangxi Xinghuo, Yichang Kelin Silicone Materials Co., Ltd., Zhejiang Xin’an Chemical, Guangzhou Tianci, Shandong Dayi Chemical, Jiaxing Kerui Silicone, etc.
2. Phenyl silicone oil
Another type of phenyl silicone oil that is more widely used is a product obtained by replacing part of the methyl groups with phenyl groups. According to the different phenyl content, it can be divided into the following categories: Low phenyl silicone oil (phenyl mole Fraction 5% ~ 10%); medium phenyl silicone oil (phenyl mole fraction 25%); high phenyl silicone oil (phenyl mole fraction 45%); high phenyl low polymerization silicone oil (phenyl mole fraction higher than 45%) ); Cross-linked phenyl silicone oil.
3. Ethyl silicone oil
Various ethyl ethoxysilanes are hydrolyzed and condensed into polysilane in the presence of hydrochloric acid. After molecular rearrangement and fractionation under vacuum, various ethyl silicone oils of different viscosities can be obtained. Used as a release agent for a variety of rubber and plastic products. This product has low volatility, low surface tension, non-toxic, non-corrosive and aging resistance, and can be formulated into different viscosities according to usage needs. It is widely used as insulation materials, precision instrument oil, hydraulic oil, special lubricating oil, etc. in the electrical industry.
4. Hydroxy silicone oil
Hydroxy silicone oil can be used as a structure control agent in the production of room temperature silicone rubber and a chain extender in the synthesis of other products. It is currently mainly produced by Wacker Chemical, Zhixin Chemical, Hubei Longma, Blue Star, Zhejiang Hengyecheng and other companies.
5. Amino silicone oil
Amino silicone oil is a basic component specially used in textile softening finishing agents. It is mainly produced by companies such as Dow Corning, Blue Star, Shandong Dayi Chemical, Deme Wacker, and Yichang Kelin. Dow Corning’s main brand name is OFX series, Momentive’s main brand name is TSF4708, and Shin-Etsu’s brand name is DC-8209A.
6. Hydrogen silicone oil
Domestic manufacturers use the 202 series name for hydrogenated silicone oil. At present, there are dozens of domestic companies producing hydrogenated silicone oil. Except for Zhejiang Hengyecheng, Blue Star, and Xin’an Chemical, the production capacity of other companies is less than 4,000 tons/year. The brand names of Dow Corning’s hydrogenated silicone oils are mostly MHX series, Momentive’s brand names are TSF series, and Shin-Etsu’s brand names are mostly KF-99 series.
7. Vinyl silicone oil
Vinyl silicone oil is the basic rubber material for the production of addition-type liquid glue and silicone gel. At present, the main domestic manufacturers include: Blue Star Fire, Zhejiang Xin’an Chemical Group, and Zhejiang Runhe. Other companies have smaller volumes.
8. Modified silicone oil
Among the modified silicone oils, polyether-modified silicone oil is used in the largest amount and is widely used as a foaming agent, fiber oil agent, fabric finishing agent, cosmetic raw material, paint leveling agent, defoaming agent and pesticide spreading agent. etc.; Fluorosilicone oil has the common advantages of silicone and fluorocarbons, and has excellent weather resistance, lubricity and oleophobicity. It is widely used in friction fields such as aerospace, automobiles, electromechanical and electronic machinery.
Wide applications of silicone oil
At present, silicone oil is mainly used as high-grade lubricating oil, anti-shock oil, insulating oil, defoaming agent, release agent, polishing agent, isolating agent and vacuum diffusion pump oil, etc.; emulsion can be used for car tire glazing, instrument panel Glazing etc. The national conditions of each country are different, and the consumption structure of silicone oil emulsion is very different. The consumption structure of Europe and the United States is given below.
<img decoding="async" class="alignSynthetic silicone grease. Food grade silicone grease is designed for sealing lubrication of food processing equipment. It does not contain any toxic substances or heavy metals and is absolutely safe for food.
Silicone paper is a commonly used packaging paper with a three-layer structure, the first layer is base paper, the second layer is laminate, and the third layer is silicone oil. Because silicone paper is resistant to high temperatures, moisture, and oil, it is generally used for packaging in the food industry.
5. Surface treatment
Mainly used for waterproofing and antifouling of fiberglass materials, with excellent waterproof performance. After building materials are treated with silicone oil, their wind erosion resistance and water repellency can be improved. Mixing 0.1% to 0.15% (mass fraction) or silicone oil emulsion with a higher solid content into the mortar can display the above characteristics and improve the ease and fluidity of the mortar. Asbestos, cement, gypsum board, etc. can also be treated with silicone oil.
6. Defoaming agent
Organic silicone oil is widely used as defoaming agent.
Added as defoaming agent in various process sections of textile printing and dyeing, such as sizing, desizing, refining, bleaching and dyeing; used in drilling, oil and gas separation, demulsification, refining sections in the petrochemical industry, as well as lubricants and cutting fluids It is used as an additive in the papermaking industry and coating and ink; it is used as a silicone defoamer in the detergent industry; and it is also used as a silicone defoamer in the food industry mentioned above.
7. Other applications
In addition, silicone oil can also be used as various additives for silicone rubber, paint leveling agents, antistatic agents, surfactants, etc., and is widely used in many fields of daily life and industrial manufacturing.
