Abstract: A two-component curable coating agent capable of forming a surface protective layer having excellent weather resistance, acid resistance, fouling resistance, and elongation properties, and a multilayer film including a surface protective layer that is a cured film of the two-component curable coating agent. The two-component curable coating agent includes a main agent that contains a polyol containing an epoxy polyol (P) and an acrylic polyol (A), and a curing agent that contains a polyisocyanate, the epoxy polyol (P) being a reaction product of an epoxy group-containing compound (e) and a carboxyl group-containing compound (c). Furthermore, the multilayer film includes a substrate layer; a surface protective layer that is layered on and integrated with a first surface of the substrate layer and that is a cured film of the two-component curable coating agent; and an adhesive layer that is layered on and integrated with a second surface of the substrate layer.

Abstract: A polymer flocculant mixing and dissolving system comprising: a mixing tank (2) in which a solid polymer flocculant is mixed with water used as a solvent; a liquid feed unit (3) for feeding an aqueous solution containing the polymer flocculant from the mixing tank; a regenerative mixer (4A,4B) used to mix and dissolve the polymer flocculant by applying pressure to the aqueous solution containing the polymer flocculant fed from the liquid feed unit while forming a vortex flow; a process channel (61) through which the aqueous solution that has passed through the regenerative mixer is fed to a downstream process; a circulation channel (62) through which the aqueous solution is returned to a position on an upstream side of the liquid feed unit; and a flow rate adjusting unit (6) for adjusting a balance between a flow rate of the aqueous solution flowing through the process channel and a flow rate of the aqueous solution flowing through the circulation channel.