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US 10,589,210 B2Granted
Aluminosilicates and coatings made therefrom for VOC removal
AssigneeEvonik Operations GmbH
InventorsMingkang Zhou, Eric G. Lundquist
Life of this patent
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Abstract
Amorphous aluminosilicates are disclosed, and these amorphous aluminosilicates are characterized by a unique combination of high surface area, low oil absorption, and a significant fraction of the total pore volume resulting from micropores. These amorphous aluminosilicates can be used in various paint and coating applications, with the resultant dried or solid film capable of removing VOC's from the surrounding air.
Claims15
A method of removing VOC's from an indoor environment, the method consisting of:
- providing an interior surface at least partially covered with a coating consisting of amorphous sodium aluminosilicate particles, and optionally one or more of, a binder, a liquid, a colorant/pigment, rheology modifiers, surfactants, defoamers, coalescents, and biocides, the amorphous sodium aluminosilicate particles characterized by:
- (i) a BET surface area in a range from about 120 to about 450 m2/g;
- (ii) an oil absorption of less than or equal to about 150 cc/100 g;
- (iii) a pore volume in a range from about 0.18 to about 0.6 cc/g;
- and
- (iv) a micropore volume of pores with pore diameters of less than 50 Å that is from about 10% to about 80% of the pore volume;
- and
- (v) a molar ratio of silica to alumina greater than 1.0.
- contacting the VOC's with the interior surface, wherein at least a portion of the VOC's in the indoor environment are absorbed by the coating.
6 more elements
A method of removing VOC's from an air stream, the method consisting of:
- passing the air stream through a filter, the filter consisting of fibers at least partially covered with amorphous sodium aluminosilicate particles, under conditions sufficient for at least a portion of the VOC's to contact the fibers and be entrained by the filter, thereby removing VOC's from the air stream;
- wherein the amorphous sodium aluminosilicate particles are characterized by:
- (i) a BET surface area in a range from about 120 to about 450 m2/g;
- (ii) an oil absorption of less than or equal to about 150 cc/100 g;
- (iii) a pore volume in a range from about 0.18 to about 0.6 cc/g;
- and
- (iv) a micropore volume of pores with pore diameters of less than 50 Å that is from about 10% to about 80% of the pore volume;
- and
- (v) a molar ratio of silica to alumina greater than 1.0.
6 more elements
Dependencies are inferred from the claim text.