Epoxy microcapsule with polyurea as wall material and preparation method thereof

The invention relates to the technical field of self repair materials and provides an epoxy microcapsule with polyurea as a wall material. The core material of the microcapsule comprises liquid epoxy resin, the wall material of the microcapsule is crosslinked polyurea prepared by carrying out an interface reaction on polyisocyanate and water, and the polyisocyanate comprises polyisocyanate containing three elements or more than three elements. The invention also provides a preparation method of the epoxy microcapsule with polyurea as the wall material. The preparation method of the epoxy microcapsule with polyurea as the wall material comprises the following steps of: dispersing polyisocyanate and liquid epoxy resin into water containing a surface active agent to obtain a mixed solution, stirring the mixed solution for 0.5-5 hours at the temperature of 25-90 DEG C, filtering, washing, and drying, so that the epoxy microcapsule with polyurea as the wall material is obtained. The preparation method of the epoxy microcapsule with polyurea as the wall material is simple and practicable and is applicable to industrial production.