Organosilicon ether oligomers serve as a key intermediate for modifying silicon materials, and the optimization of their synthesis process directly determines the product performance and application compatibility. The traditional synthesis route has problems such as low termination rate and high toxicity risks. The emergence of the two-step silane hydrogen addition method has achieved a technological breakthrough and has become the preferred solution for industrial production. 
This process uses vinyl-terminated polydimethylsiloxane (viscosity 1000 - 500000 mPa·s) as the base material. In the first step, it is mixed with a platinum catalyst at a mass ratio of 1:(10000 - 1000000) in a nitrogen atmosphere or under vacuum conditions, and reacts at 25 - 60℃ for 1 - 12 hours to form a coordination system. Then, inhibitors such as ethynylcyclohexanol are added to control the reaction rate. In the second step, a hydrogen-containing double cap is added for chain extension, and after vacuum removal of excess raw materials at 40 - 70℃, the siloxane ether is added at a mass ratio of 1:(10 - 1000) to complete the termination. 
This method avoids the flammable and toxic risks of hydrogen-containing ether silanes in the traditional one-step method. The termination rate can reach over 98%. The viscosity of the product fluctuates less than 5% at room temperature for one year. By adjusting the alkoxy substituents (methoxy, ethoxy, etc.) and the polymerization degree (n ≥ 350), a series of products with viscosities ranging from 1000 to 550000 mPa·s can be precisely prepared, meeting the modification requirements of different scenarios and providing a stable intermediate support for the high-performance of silicone rubber.