Reaction-type flame-retardant epoxy resin microcapsule and preparation method thereof

The invention discloses a reaction-type flame-retardant epoxy resin microcapsule. The reaction-type flame-retardant epoxy resin microcapsule comprises a capsule core and a capsule wall, wherein the capsule core is 30 to 70 percent by mass of phosphorus-containing epoxy resin, and the capsule wall consists of the following ingredients by mass percent: 15 to 55 percent of phosphorus-containing acrylate, 15 to 45 percent of epoxy acrylate, 10 to 50 percent of a polymerizable emulsifier, 0.5 to 3 percent of an acrylate crosslink agent and 0.1 to 0.5 percent of a photoinitiator. The invention also discloses a method for preparing the microcapsule. The microcapsule has the following advantages that the flame resistance and self-repairing function are good, so that the microcapsule can be widely applied to the fields such as thermosetting self-repairing resin-based composite materials and coatings. The method for preparing the microcapsule adopts an ultraviolet interface in-situ polymerization method, so that not only is the process simple and less time consumed, but also the method is controllable, the safety of the prepared composite material can be improved, and the service life of the composite material can be prolonged.