Preparation method of unilateral reaction type functional group terminated silicone oil

Abstract

The invention discloses a preparation method of unilateral reaction type functional group end-capped silicone oil, which specifically comprises the following steps: S1, dissolving hexamethylcyclotrisiloxane in THF (tetrahydrofuran) under the protection of nitrogen, setting the flow rate of a metering pump B to be 28.06 g / min, setting the flow rate of a metering pump A to be 4.53 g / min under the protection of 400mL of butyl lithium and nitrogen, simultaneously starting the pumps A and B to pump materials into a premixer and then enter a microchannel reactor, the reaction temperature is set to be 0-5 DEG C, and the mixture enters the reactor through a metering pump C; the preparation method of the unilateral reaction type functional group end-capped silicone oil disclosed by the invention comprises the following steps: carrying out ring-opening polymerization reaction on butyl lithium and hexamethylcyclotrisiloxane cations by using a microchannel reactor, and then reacting with monochlorosilane to generate single-end hydrogen-containing or single-end functional group end-capped silicone oil. The equilibrium reaction time is shortened, the molecular weight distribution width of the silicone oil is reduced, and the high-quality monoreactive functional group terminated silicone oil is obtained.

Description

technical field [0001] The invention relates to the technical field of silicone oil preparation, in particular to a preparation method of a unilateral reactive functional group-terminated silicone oil. Background technique [0002] The single-end reactive functional group-terminated silicone oil has good powder dispersibility, hydrophobicity, antifouling, and non-adhesion. Heat resistance, wear resistance, biocompatibility, good oxygen permeability. Widely used in medical, electronic, biological and other special materials. [0003] At present, due to technological reasons, the grafting rate of these products is not high, and they contain double-end reactive functional group-terminated silicone oil and inert group-terminated silicone oil, which leads to low product quality and seriously affects the use effect. In order to obtain high-quality products, it is necessary to use Butyllithium is used as a ring-opening reagent and an inert group end-capping agent, and the reactio...

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Problems solved by technology

[0004] The invention discloses a preparation method of unilaterally reactive functional group-terminated silicone oil, aiming to solve the problem that the grafting rate of the current type of products is not high due to technological reasons, and contains double-terminal reactive functional group-terminated silicone oil and Inert group-capped silicone oil leads to low product quality and seriously affects the use effect. In order to obtain high-quality products, it is necessary to use butyllithium as a ring-opening reagent and inert group-capped agent. The reaction requires low temperature and a long equilibrium reaction time. Handle complex, complex technical issues with solvent recovery

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