PROCESS FOR PREPARATION OF SELF HEALING MICROCAPSULES

摘要

The present invention disclosed a process for the preparation of microcapsules containing epoxy resin which comprises water-insoluble and/or water-soluble components prepared by in-situ polymerization using non-aqueous continuous phase which acts as healing agents for the micro-cracks when embedded in composite structures.

主权项

1. A process for the preparation of self-healing microcapsules with polyurethane as capsule wall material prepared by in-situ polymerization using non-aqueous continuous phase comprising the steps of:
a) preparing a mixture of epoxy components to be encapsulated and polyisocyante; b) preparing a solution of diol or polyol with a cross-linker in aliphatic hydrocarbon; c) dispersing the mixture of step a) in a solution of a stabilizer and a catalyst in an aliphatic hydrocarbon; d) adding the solution of step (b) drop wise to the dispersion of step c) under agitation followed by treatment with anti-agglomerating agent to obtain microcapsules; and e) filtering and/or centrifuging, washing the microcapsules as obtained in step (d), with the aliphatic hydrocarbon and drying the microcapsules under vacuum at ambient temperature to obtain microcapsules with polyurethane as capsule wall material.