| abstract |
【Task】 Disclosed is a spray agent that forms a slow-dissolving film having water resistance to a water flow, which is applied to a water supply facility or the like. [Solution] The spray according to the present invention comprises a salt of zinc (II) ions, polyacrylamide, and water as a solvent, wherein the zinc salt is 0.01 mM or more and 100 mM or less, and the polyacrylamide is 0 with respect to the liquid agent. A coating composition containing from 0.001% by mass to 10% by mass, wherein the ratio of the substance amount (mol) of the zinc salt to the substance amount (mol) of the unit structure of polyacrylamide is 1/100 or more and 10 or less. Is filled in a container provided with a spraying device. A preferred embodiment of the coating composition used in the present invention has a viscosity of 1 mPa · s or more and 50 mPa · s or less measured using a B-type viscometer under the conditions of a liquid temperature of 20 ° C., a rotation speed of 60 rpm, and a rotation time of 30 sec. is there. [Selection] Figure 3 |