Q-type end-capping reagent, Q-type branched polysiloxane as well as preparation method and application of Q-type end-capping reagent and Q-type branched polysiloxane

The invention provides a Q-type end-capping reagent, Q-type branched polysiloxane as well as a preparation method and application of the Q-type end-capping reagent and the Q-type branched polysiloxane. The Q-type end-capping reagent is prepared from the following raw materials: a monomer containing a Q structure, a disiloxane monomer and silazane; the preparation method of the Q-type end-capping reagent comprises the following steps: (1) under the action of a catalyst A, carrying out equilibrium reaction on a monomer containing a Q structure and a disiloxane monomer to obtain an intermediate product 1; (2) adding water into the reaction system in the step (1), carrying out hydrolytic condensation reaction, adding a neutralizer into the reaction system, and carrying out neutralization reaction to obtain an intermediate product 2; and (3) reacting the intermediate product 2 with silazane to obtain the Q-type end-capping reagent. The preparation raw materials of the Q-type branched polysiloxane comprise the end-