Polyurea coating dicyclopentadiene microcapsule and method for preparing same

Abstract

The invention relates to a polyurea packed dicyclopentadiene microcapsule and relative preparation. Wherein, the invention is characterized in that: it comprises isocyanate, amine, dicyclopentadiene, inhibitor, water, acetone, surface activator and defoaming agent. And the preparation comprises: adding water solution of surface activator into the flask of mixer, adding dicyclopentadiene with inhibitor, defoaming agent; mixing at normal temperature and adding isocyanate solution diluted by acetone; adding amine water solution; mixing and increasing temperature slowly; then keeping the temperaur and ending reaction; washing the product by water for several times; filtering and drying to obtain micro capsule. Since the polyurea is heat convertible resin crossed by amine polymers, it has better water resistance, mechanical strength and thermal stability; and the invention has simple process, while the yield is 80-90%.

Description

Technical field: [0001] The invention relates to a polyurea-coated dicyclopentadiene microcapsule and a preparation method thereof. Background technique: [0002] In recent years, due to the application of microcapsules in the self-repair of composite materials, the self-repair technology of composite materials has made a qualitative leap. However, there are very few types of microcapsules that can be used for self-healing of composite materials at present, so the synthesis and research of microcapsules that can be used for self-healing of composite materials have received extensive attention. The selection of microcapsule wall materials that can be used for self-healing of composite materials has strict conditions. The microcapsules are intact; on the other hand, the mechanical properties of the microcapsule wall materials should not be too high, so as to ensure that the microcapsules are broken under the action of crack stress to release the capsule core material when the...

AI Technical Summary

Problems solved by technology

However, using polyurea-formaldehyde as the wall material to synthesize microcapsules that can be used in resin-based composite materials takes a long time, and the pH value of the solution during the synthesis process is strictly controlled, which brings certain difficulties to the synthesis of microcapsules. difficulty

At the same time, due to the single wall material of microcapsules used for self-repair of composite materials, the scope of self-repair of composite materials is reduced.