There are mainly three methods for the synthesis of low-hydrogen silicone oil.

The first is the halosilane method: the starting materials are methylhydrogendichlorosilane, dimethyldichlorosilane, trimethylmonochlorosilane and solvent, which are hydrolyzed and decomposed in the reactor, and then concentrated sulfuric acid or solid acid catalyst is used to Telomerization, after the reaction, the oil layer removes the solvent and low boiling matter, and then decolorizes and filters to obtain the finished product; (disadvantages: violent reaction, difficult to control, complicated process, and a large amount of HCl gas will be released during the reaction, which is not environmentally friendly)

The second is the ring-opening copolymerization method: use octamethylcyclotetrasiloxane (D4) and tetramethylcyclotetrasiloxane (DH4) for ring-opening copolymerization, the reaction is generally carried out under nitrogen atmosphere, the catalyst can be sulfuric acid, Toluene, sulfonic acid or acid clay; (Disadvantages: the reaction process is more violent, the raw material is expensive, and it is currently limited to laboratory research.)

The third is the high hydrogen-containing silicone oil telomerization method: using trimethylsilyl-terminated high hydrogen-containing silicone oil, octamethylcyclotetrasiloxane (D4) and hexamethyldisiloxane (MM) under acid-catalyzed conditions For telomerization, the catalyst can be sulfuric acid, trifluoromethanesulfonic acid or solid heteropolyacid.


About low hydrogen silicone oil, please check the details:
https://www.siliconefoam.net/product-methyl-low-hydrogen-silicone-oil-iota-203-.html