초록 ▼

Thermal insulation composed of porous ceramic material can be waterproofed by producing a thin silicone film on the surface of the insulation by exposing it to volatile silicone precursors at ambient conditions. When the silicone precursor reactants are multi-functional siloxanes or silanes containi

Thermal insulation composed of porous ceramic material can be waterproofed by producing a thin silicone film on the surface of the insulation by exposing it to volatile silicone precursors at ambient conditions. When the silicone precursor reactants are multi-functional siloxanes or silanes containing alkenes or alkynes carbon groups higher molecular weight films can be produced. Catalyst are usually required for the silicone precursors to react at room temperature to form the films. The catalyst are particularly useful in the single component system e.g. dimethylethoxysilane (DMES) to accelerate the reaction and decrease the time to waterproof and protect the insulation. In comparison to other methods, the chemical vapor technique assures better control over the quantity and location of the film being deposited on the ceramic insulation to improve the waterproof coating.

대표청구항 ▼

[ The invention claimed is:] [1.] A process of waterproofing a porous ceramic insulating material which comprises exposing said ceramic insulating material for a period sufficient to form a waterproof coating thereon to an effective amount of at least one vaporized low molecular weight silicone prec

[ The invention claimed is:] [1.] A process of waterproofing a porous ceramic insulating material which comprises exposing said ceramic insulating material for a period sufficient to form a waterproof coating thereon to an effective amount of at least one vaporized low molecular weight silicone precursor in the presence of a catalyst; said silicone precursor having a vapor pressure greater than about 0.01 mm of mercury in the temperature range of about 0.degree. C. to 60.degree. C.; said silicone precursor being selected from the group consisting of organosiloxanes, organosilanes and combinations thereof wherein the organo substitutents of the silanes and siloxanes have C.sub.1 to C.sub.4 carbon atoms.