Annular high-water-resistance calcium carbonate coupling agent as well as synthesis method and application thereof

The invention discloses an annular high-water-resistance calcium carbonate coupling agent, which is synthesized by the following method: taking boric acid and toluene, stirring, dropwise adding cycloheptanol within 1 hour, and then heating for reflux reaction for 6 hours; and cooling to room temperature, dropwise adding diethanol amine within 1 hour, then heating, carrying out reflux reaction for 12 hours, and carrying out reduced pressure distillation to remove methylbenzene and diethanol amine, thereby obtaining the cyclic high-water-resistance calcium carbonate coupling agent. The invention further discloses a synthesis method and application of the annular high-water-resistance calcium carbonate coupling agent. According to the cyclic high-water-resistance calcium carbonate coupling agent provided by the invention, a hydrophobic cyclic large-steric-hindrance group is introduced to a B-O bond, so that attack of water molecules can be effectively inhibited, the hydrolysis speed is reduced, the hydrolytic st