A microcapsule for self-healing asphalt pavement cracks and its preparation method

Abstract

This invention discloses a self-healing microcapsule for asphalt pavement cracks and its preparation method, relating to the field of road engineering materials technology. The structure includes: the microcapsule comprises a composite modified wall material and a core material, wherein the core material forms an interpenetrating network structure after curing; the mass ratio of the composite modified wall material to the core material is 1:(1.5-2.5); the composite modified wall material, by weight, consists of 60-75 parts of urea-formaldehyde resin prepolymer, 5-15 parts of glass fiber, 8-12 parts of melamine-formaldehyde resin, and 400 parts of polyethylene glycol. The wall material consists of 5-8 parts of silane coupling agent KH-5501-3 parts, polyethylene glycol diglycidyl ether 0.5-1.0 parts, and dispersant 0.8-1.2 parts; the core material, by weight, consists of 75-85 parts of asphalt recycling agent with an aromatic content ≥45%, 2-5 parts of maleic anhydride, 0-15 parts of epoxy resin E-511, and 2-3 parts of microcapsule-encapsulated dicyandiamide latent curing agent; this invention optimizes the design of the wall and core materials, enhances performance and compatibility, improves the preparation process, improves microcapsule performance, reduces costs, and enhances the overall benefits and sustainability of road surfaces.

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