Preparation of block water-soluble silicon oil

The invention discloses a preparation method of block water soluble silicone oil of textile softening finishing agent. The prior modified amino water soluble silicone oil has good stability, but enables the hand touch of the processed textile to be greatly reduced because an entrained hydrophilic chain link is still on a lateral chain of polymer. The preparation method comprises four steps: the amidation of amino coupling agent, the preparation of hydrogen terminated methylsiloxane midbody, the preparation of polysiloxane-polyether linear block polymer, and the ammonolysis of block polymer. The block water soluble silicone oil prepared by the invention has the advantages of high concentration and stability, smoothness, and the like.