Patent ID: 6086664
Filing Date: 2000-07-11
Classification: C04B,C09D

Abstract:
A process of waterproofing alumina-rich or silica-rich fibrous thermal insulation, said process comprising the steps of:(a) providing an alumina-rich or silica-rich fibrous thermal insulation material;(b) providing a waterproofing solution consisting of:(1) a carrier solvent selected from the group consisting of aliphatic alcohols having 1C to 6C, water and mixtures thereof;(2) a dialkoxysilane selected from the group consisting of methyldiethoxysilane, dimethyldiethoxysilane and mixtures thereof; and optionally(3) a modifier selected from the group consisting of acetic acid, nitric acid, ammonium hydroxide, RNH.sub.2, R.sub.2 NH, R.sub.3 N and MOH, where R is selected from the group consisting of an alkyl group having 1C to 10C and hydrogen and where M is Na, Li or K;(c) contacting the fibrous material with the waterproofing solution for a sufficient amount of time to waterproof the fibrous material: and(d) curing the coated fibrous material to render it sufficiently waterproof.