Hydrophobic silica gel and its manufacture

Abstract

Abstract PURPOSE:To obtain a hydrophobic surface having prescribed heat of adsorption of wate by hydrothermally treating silica hydrogel or silica xerogel immersed in an alkaline aqueous soln. of a prescribed pH. CONSTITUTION:Silica hydrogel or silica xerogel is immersed in an alkaline aqueous soln. of 10-11.2pH such as 0.001N aqueous NaOH soln., hydrothermally treated, taken out, and dried. The resulting silica gel has <=10.6kcal/mole heat of adsorption during adsorption of water on the surface. The heat is smaller than heat of condensation of water. The surface of the silica gel is hydrophobic, and the silica gel is widely used as hydrophobic and organophilic silica gel for org. paint, plastics and printing ink.

Inventors

• 👤 Seiichi Kondo
• 👤 近藤　精一
• 👤 Yasuo Saito
• 👤 斎藤　泰郎

Bibliographic Details