| 摘要 |
PURPOSE:To produce a water-absorbing sheet having excellent water-absorptivity and water-sucking property and suitable e.g. as an element of a humidifier or a cooling fan for continuously absorbing and evaporating water by coating the pore wall surface of a porous sheet having open pore structure with a silica get having a specific pore size. CONSTITUTION:This water-absorbing sheet is produced by coating the pore wall surface of a porous sheet A having an open pore structure (e.g. a composite material sheet composed of a reinforcing fiber such as polyester fiber or glass fiber, a binder and optionally a powdery phenolic resin) with a silica gel B having a pore radius of >=4nm. The water-absorbing sheet can be produced, e.g. by suspending a hydrated silicon dioxide having a particle diameter of 10-20nm in water in the presence of a colloid stabilizing agent, impregnating the produced silica sol into the component A, converting into a hydrogel with a hydrogelation agent such as an alum and drying the product.
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