CAS NO.: 556-67-2

Molecular formula: C8H24Si4O4

Molecular weight: 296.63

EINECS:209-136-7

Flash point: 56°C

Density (P20)g/cm3: 0.956

Octamethylcyclotetrasiloxane (d4) is based on dimethyldichlorosilane as the main raw material, based on the hydrolyzate of the hydrolysis synthesis process, separated, rectified, or based on the hydrolyzate after cracking, or A compound made on the basis of dmc. After further separation and distillation.

Octamethylcyclotetrasiloxane chemical properties:

Octamethylcyclotetrasiloxane is a colorless transparent liquid with a melting point of 17.5°C and a boiling point of 175°C at 74°C (2.66kpa). The relative density is 0.9558 (20/4°C). The refractive index is 1.3968. The flash point is 60°C. Soluble and miscible in organic solvents, insoluble in water.

Use of octamethylcyclotetrasiloxane:

Octamethylcyclotetrasiloxane is an intermediate of silicone oil and silicone rubber, used as a raw material for silicone, and also used in the electronics industry.

Used in the manufacture of high tear-resistant silicone rubber products, also used in the synthesis of other polymer compounds.

It is used as an intermediate for the preparation of silicone oil and is also used for insulation and moisture resistance of radio parts.

Used in hair care cosmetics, such as hair conditioners, curing agents, styling agents, hair sprays, dry hair shampoos, etc., can make hair smooth, soft, and easy to comb. This product is a silicone monomer, which can be used to synthesize silicone polymers.

Octamethylcyclotetrasiloxane production method:

Add dimethyldichlorosilane dropwise to water, keep the temperature at 30-40°C, separate layers, release acid water, hydrolyze the oil with sodium hydroxide solution, add the hydrolyzate and 0.5%-2% potassium hydroxide Crack in the cracking kettle at 120-140°C and 99.8kpa vacuum. Fractional distillation of the lysate, collection of fractions at 173-176 ° C, to obtain Octamethylcyclotetrasiloxane.