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US 12,576,353 B2Granted
Positively charged filter material with ability for removing charged particles efficiently, and method for producing same
AssigneeToray Advanced Materials Korea Inc.
InventorDae Won Lee
Life of this patent
Estimating the term…
Abstract
The present invention relates to a positively charged filter material with excellent ability for removing charged particles efficiently, and a method for producing the same, and more specifically to a positively charged filter material having the ability to selectively remove efficiently, in water, negatively charged organic/inorganic particles, heavy metal ions and pathogenic microorganisms, and a method for producing the same.
Claims9
A positively charged filter material, comprising:
- a porous support which comprises at least one fiber selected from polypropylene (PP) fiber, polyethylene (PE) fiber, polyester fiber, nylon fiber and cellulose fiber and is surface-modified by atmospheric-pressure plasma surface treatment;
- and
- a positively charged coating layer which is formed by coating a positively charged coating composition comprising at least one solvent selected from C2 to C5 alcohol, acetone and water (H2O), a polyfunctional amine compound and a crosslinking agent that performs an epoxy reaction with the polyfunctional amine compound on the surface and inside of the porous support,
- wherein the weight of the positively charged coating layer is 5% to 15% of the weight of the porous support,
- wherein the porous support is a composite non-woven fabric having a layered structure of a spun bond non-woven fabric in an upper layer and a lower layer and a melt blown non-woven fabric that has a basis weight of 1 to 10 g/m2 in a middle layer positioned between the upper and lower layers, and
- wherein the composite non-woven fabric has an average thickness of 0.2 to 2 mm, and a basis weight of 30 to 150 g/m2.
3 more elements
A method for producing a positively charged filter material, comprising the steps of:
- (1) performing surface modification for a porous support comprising at least one fiber selected from polypropylene (PP) fiber, polyethylene (PE) fiber, polyester fiber, nylon fiber and cellulose fiber by performing atmospheric-pressure plasma treatment;
- (2) contacting the surface-modified porous support with a positively charged coating composition comprising at least one solvent selected from C2 to C5 alcohol, acetone and water (H2O), a polyfunctional amine compound and a crosslinking agent that performs an epoxy reaction with the polyfunctional amine compound to coat the positively charged coating composition on the porous support;
- and
- (3) forming a positively charged coating layer by thermally crosslinking the porous support coated with the positively charged coating composition,
- wherein the porous support is a composite non-woven fabric having a layered structure of a spun bond non-woven fabric in the upper and lower layers and a melt blown non-woven fabric that has a basis weight of 1 to 10 g/m2 in the middle layer, and
- wherein the composite non-woven fabric has an average thickness of 0.2 to 2 mm, and a basis weight of 30 to 150 g/m2.
3 more elements
Dependencies are inferred from the claim text.