The methyl hydrogen-containing silicone oil is prone to cross-linking reaction due to a certain amount of relatively active Si-H bond in the molecule, and can be used as a crosslinking agent for the addition of liquid silicone rubber under the catalysis of Pt catalyst. Under the action of metal salts and catalysts, a hydrophobic film can be formed on the surface of various substances at a lower temperature. The Si-H bond is easily broken under alkaline conditions:
It can be seen from the structure that the maximum difference between the hydrogen-containing methyl silicone oil and the two silicone oils described above is that the silicon-oxygen bond contains a hydrogen-silicon
structure, and the Si-H bond is easily broken under alkaline conditions, so the hydrogen-containing methyl group is contained. The alkali resistance of silicone oil is weaker than other silicone oils.
Explain as follows:
Performance parameters: Refractive index (25 ° C): 1.390~1.410
Hydrogen content (%, m/m) ≥: 1.55
Appearance: methyl hydrogen silicone oil
is generally a colorless or yellowish transparent liquid. Inferior silicone oils are usually turbid. The color of silicone oil is an important criterion for distinguishing the quality of silicone oil.
Hydrogen content: This is the biggest difference between methyl hydrogen silicone oil and other silicone oils. The amount of hydrogen in the methyl silicone oil is determined by the size of N in the molecular structure because the terminal groups of the general methyl silicone oil are the same.
Kinematic viscosity: Kinematic viscosity refers to the ratio of the dynamic viscosity and density of a liquid at the same temperature.
Specific gravity: It refers to the ratio of the volume and density of a substance.
Refractive index: Refractive index can be used as a measure of liquid purity and can be used to determine liquid composition.
Acid value: It is an indicator to measure the acidity and alkalinity of the product. The pH value of the silicone oil product represented by the above parameters is generally between 6 and 8.
Advantages and uses of Methyl Hydrogen Silicone Oil
The biggest advantage of methyl hydrogen silicone oil is its good waterproof effect. It can be crosslinked into a film at a low temperature by a metal salt catalyst, and a waterproof film can be formed on the surface of various materials. It can be used as a waterproofing agent for various materials such as fabric, glass, ceramic, paper, leather, metal, cement, marble, especially in the waterproof application of fabrics. Together with the methyl hydroxy silicone oil emulsion, it is waterproof and maintains the original breathability and softness of the fabric, and can improve the tear strength, friction strength and antifouling properties of the fabric. In addition, it can also be used as a paper release agent and cross-linking agent, as well as a foaming agent for foamed silicone rubber.