A chemical method for preparing trigger Microcapsules

The present invention discloses a chemical method for preparing microcapsules and to trigger, the microcapsule wall material is a metal such as aluminum, an absorbent core containing chloride ions and / or corrosion inhibitor. Microcapsules stable at ambient conditions without the presence of chloride ions, can effectively reduce the loss of chlorine ions dissolved in the cement absorbent pulping stage or rust agent. When confronted with a chloride ion, a passivation layer on the surface of the aluminum is broken microcapsule wall material, the aluminum pitting peeling wall, releasing the core contents reached withdrawing chlorine rust effect. This aluminum as wall material of the microcapsules, the preparation process is simple, inexpensive, environmentally friendly, water permeability, a long storage time, promote the use of appropriate concrete engineering.