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The Nature and Use of Polymethyl Hydrogen Siloxane

Properties of polymethyl hydrogen siloxane

In addition to the general properties of dimethyl silicone oil, methyl hydrogen silicone oil can participate in various chemical reactions due to its active Si-H bond in its molecular structure, and has good film forming properties. It can react with water or alcohol in the presence of a substance such as a base or an acid to release hydrogen. In the presence of platinum chloric acid, it is highly susceptible to an addition reaction with an olefinic compound. When the temperature is greater than 50 ° C, it can be reacted with the epoxy group-containing compound. Methyl hydrogenated silicone oil is not as heat resistant as dimethicone, but its hydrophobicity and anti-stick properties are better than dimethicone.

Process for preparing polymethyl hydrogen siloxane

The methyl hydrogen silicone oil can be prepared by the following reaction. 1. Hydrolysis 2. Tuning A calculated amount of a mixture of methyldichlorosilane, trimethylchlorosilane, and benzene was added to a reactor previously filled with water. After the addition was completed, stirring was continued for 1 hour, and the layers were allowed to stand, and the acid water was discharged. The oil layer is washed with water to neutrality. The telomerization reaction is then carried out at room temperature in the presence of concentrated sulfuric acid. After the reaction is complete, the sulfuric acid is removed and the oil layer is washed again to neutrality. The low-boiling substance is distilled off under reduced pressure, and decolorized with activated carbon, and vacuum-filtered to obtain a finished product.

Use of polymethyl hydrogen siloxane

Methyl hydrogenated silicone oil can be crosslinked at low temperatures. It has a good hydrophobic effect on the surface of various substrates, a large contact angle, and a durable waterproof film, which is widely used in textile, paper, leather and construction industries. Treating the fabric with methyl hydrogenated silicone oil not only improves its tear strength, abrasion resistance, wrinkle resistance and antifouling properties, but also greatly improves the resistance to ironing and sewn, and can achieve the original gas permeability without loss and is completely waterproof. In addition, methyl hydrogen silicone oil has better anti-stick properties than dimethicone. Therefore, it is widely used as a release agent for release agents, paper and packaging materials in the rubber and plastics industries. For example, a rubber product factory uses methyl hydrogenated silicone oil as a car inner tube release mold, which can be used continuously for 1 to 2 weeks. The optical glass coated with methyl hydrogen silicone oil not only has excellent light transmittance, but also has excellent mold and moisture resistance. Methyl hydrogenated silicone oil can also be used as a rust inhibitor for metals.
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