Abstract
Bituminous material is widely used in construction and building field, which often need excellent waterproof performance in the process of application. The aim of this work was to design a novel waterproof bituminous coating using self-healing microcapsules containing ultraviolet light curing agent. Core material of microcapsules was a compound of polyurethane acrylate (prepolymer 95 wt%) and 2-hydroxy-2-methyl-phenylacetone (initiator, 5 wt%). Morphology and chemical analysis showed that the cross-linked cured methylether-melamine–formaldehyde (HMMM) shell material protected core material under the condition of high temperature molding and avoid sunlight. The microcapsules had perfect spherical shape with a mean size of 20 μm and shell thickness of 2 μm. Microcapsules dispersed in bitumen homogeneously without agglomeration. No deboning was found in the interface between microcapsules and bitumen. Microcapsules resisted the temperature above 200 °C and remained the core material safety in shells. Through a man-made microcrack experiment, it proved that the bitumen sample with 3.0 wt% microcapsules completed a quick self-healing process with the help of ultraviolet light. Waterproof measurement also indicated that the microcrack in bituminous coating disappeared with the help of self-healing microcapsules under ultraviolet light. In other words, the rapid disappearance of microcracks can contribute to improving the waterproof performance of bituminous coating.
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