HIGHLY DRAINABLE BUILDING MATERIAL

摘要

Disclosed is a building material that can efficiently eliminate water from the surface thereof by causing water to apparently autonomously move using a force other than gravity, as a propulsive force. By controlling a hydrophilic region and a hydrophobic region on the surface of the building material so as to increase the area ratio of the hydrophilic region to the hydrophobic region in a given direction, a pushing-out force (31) from the hydrophobic region (11) side is exerted on water, while a pulling-in force (32) from the hydrophilic region 12 side is exerted on water. Using both of these forces as the propulsive force, water 20 moves even on a horizontal plane and is eliminated from the surface.