Hydrogenated silicone oil is a key product among silicone oil varieties. It is not only the starting material for many modified silicone oils, but also can be used to obtain a variety of modified silicone oils through silane addition reaction, such as polyether modified silicone oil, long-chain alkyl silicone oil, epoxy modified silicone oil, etc.
According to the different hydrogen content, hydrogenated silicone oil can be divided into high hydrogenated silicone oil and low hydrogenated silicone oil.

Ⅰ. What is high hydrogenated silicone oil?
Scientific name: polymethyl hydrogen siloxane, a colorless and transparent liquid.
As a special type of organosilicon compound, high hydrogenated silicone oil has a wide range of application prospects in many industrial fields with its unique molecular structure and chemical properties. It is a linear polymethyl hydrogen siloxane with high reactivity and stability, and is an important raw material and intermediate for many chemical reactions.

Ⅱ. Product characteristics of high hydrogen silicone oil
1. High hydrogen content: ensures its high efficiency in various chemical reactions;
2. High reactivity: due to the large number of Si-H bonds in the molecule, high hydrogen silicone oil has extremely high reactivity and can react with a variety of chemical substances containing double bonds, hydroxyl groups and other active groups;
3. Weather resistance: can maintain stable performance under various environmental conditions;
4. Waterproof performance: under the action of metal salt catalyst, high hydrogen silicone oil can form a dense waterproof film on the surface of the substrate, giving the substrate excellent moisture-proof, mildew-proof and rust-proof properties;
5. Viscosity stability: film can be formed smoothly even in low temperature environment;
6. Chemical stability: high hydrogen silicone oil has excellent Chemical stability, can remain stable in a variety of chemical reactions, and is not easy to react with other substances;
7. Thermal stability: High hydrogen silicone oil can also remain stable under high temperature conditions, without decomposition or deterioration;
8. Surface activity: It has the ability to reduce the surface tension of the liquid, thus having the effects of wetting, emulsification, dispersion, etc.;
9. Adjustable viscosity: Its viscosity increases with the increase of molecular weight, so its viscosity can be controlled by adjusting the molecular weight;
10. Safety: Colorless, non-toxic, non-irritating, safe and reliable to use;
11. Environmental protection: As an organic silicon compound, high hydrogen silicone oil has good biocompatibility and environmental friendliness, which meets the requirements of modern industry for environmental protection.

Ⅲ. Application of high hydrogen silicone oil
High hydrogen silicone oil is a chemical substance with excellent properties, which is widely used in many fields.
1. Waterproof treatment of building materials and decorative materials: High hydrogen silicone oil can be used as a waterproofing agent, applied to the surface of building materials such as glass, ceramics, leather, paper, metal, cement, marble, etc., to form an effective waterproof film, thereby improving the waterproof performance and service life of the material.
2. Textile industry: It can be used as a finishing agent for fabrics (such as cotton, linen, silk, acrylic, polyester, etc.) to improve the waterproof and anti-fouling properties and durability of the fabrics, while improving their feel and drape. When used with methylhydroxy silicone oil emulsion, it can be waterproof and maintain the air permeability of the fabric, improve tear strength, friction strength and anti-fouling properties, and improve the feel and stitching performance.
3. Water repellent treatment of powders: High hydrogen silicone oil can treat powder materials, such as powders of dry powder fire extinguishers, mica, clay, etc., to prevent them from agglomerating during use and maintain their good performance.
4. Plastic additives: Improve the processing and mechanical properties of plastics, prevent aging and yellowing of plastics, and extend their service life.
5. Production of rubber products: It can be used as an anti-yellowing agent for high-temperature vulcanized silicone rubber to improve the color stability of rubber products. At the same time, it can also be used as a cross-linking agent for addition-type silicone rubber series products to enhance the cross-linking density and physical properties of rubber materials.
6. Ink manufacturing: In the field of ink manufacturing, high hydrogen silicone oil can be used as a diluent for silicone ink to improve the fluidity and printing effect of the ink.
7. Paper processing: In paper processing, high hydrogen silicone oil can be used as an anti-sticking release agent and cross-linking agent, which helps to improve the processing efficiency and quality of paper and improve the waterproof performance of paper.
8. Use as a lubricant: Suitable for lubrication of rubber, plastic bearings, and gears to reduce wear and friction.
9. Cosmetics industry: Used as a hydrophobic agent and lubricant in oily foundation to improve the use effect of cosmetics.
10. Important intermediates: Synthetic raw materials and important intermediates of polyether modified silicone oil, alkyl modified silicone oil, etc., provide important raw material support for the preparation of modified silicone oil.

V. Preparation method of high hydrogen silicone oil
Methylchlorosilane direct hydrolysis equilibrium method can be used. The specific steps are as follows:
Raw material preparation: The main raw materials are methyl (hydrogen) dichlorosilane and trimethyl chlorosilane, of which methyl (hydrogen) dichlorosilane is the main raw material, and trimethyl chlorosilane is used as a capping agent.
Hydrolysis equilibrium reaction: The main raw material methyl (hydrogen) dichlorosilane and the capping agent trimethyl chlorosilane are subjected to a hydrolysis equilibrium reaction to obtain a hydrolysis product.
Acid removal treatment: The hydrolysis product is separated to remove the acid water therein.
Catalytic equilibrium reaction: Concentrated sulfuric acid is added as a catalyst to carry out a equilibrium reaction.
Acid separation treatment: Sulfuric acid is separated and removed.
Water washing and acid removal: The product is washed with water to remove residual acidic substances.
Removal of low molecular weight substances: The product is treated to remove low molecular weight substances, and finally the finished product of hydrogen-containing silicone oil is obtained.

It should be noted that although high hydrogen-containing silicone oil has a variety of applications, in actual use, it is necessary to select the appropriate type and concentration of products according to specific application scenarios and needs to ensure the best application effect.