This one sort of goes along with the kevlar curtains but it's more out there so I'm calling it a wibni instead of an idea. Chemical reactions are either endothermic (consume energy) or exothermic (release energy). Explosions are very exothermic reactions. Is it possible for a chemical reaction to be as strongly endothermic as an explosion is exothermic? Imagine an aerosol or foam that we could spray on or around a suspicious object that would consume the heat and high pressure of the shock wave by driving some chemical reaction. Ideally, the end product would be something useful but I'd settle for a foul smelling goo.
I have absolutely no idea whether any of this is even theoretically possible. For it to do any good, the reaction would have to happen very fast. On the other hand the speed of a reaction is usually a product of temperature and pressure and we would have a lot of that to work with.
Pyrotechnics is a very old field and there are large libraries of books on every aspect of the creation and use of explosives. Anti-explosive chemistry on the other hand is wide open for someone looking to carve out a niche of their own.