Process of forming a hydrophobic aerogel

Details Process of forming a hydrophobic aerogel Process of forming a hydrophobic aerogel

1992-08-12

1998-11-03

Lewis, Michael

Compositions

Preservative agents

Anti-corrosion

423338, 2523156, B01J 1300

Patent

active

058303871

ABSTRACT:
A hydrophobic aerogel is fabricated by reacting a polymer having a skeleton structure of (SiO.sub.2).sub.n with a hydrophobic agent having hydrophobic groups as well as functional groups reactive to silanol groups to obtain a denatured polymer, forming a gel consisting of two phase of a dispersing medium and the denatured polymer which was performed a hydrophobic treatment, and then, supercritically drying the gel at temperature and pressure above a critical point of the dispersing medium. The hydrophobic aerogel has improved characteristics free from deterioration in light transmissivity as well as lowered thermal resistance and also free from a dimensional variation such as shrinkage which would otherwise occur by contact with moisture, so that it can maintain the excellent characteristics for long time periods. Particularly, the aerogel is useful as a material having excellent light transmissivity and thermal resistance.

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