Antibacterial filter, method for manufacturing same, and air purifier comprising same

An antimicrobial filter,

• which comprises a fiber formed from a polymer resin and antimicrobial particles,
• wherein the antimicrobial particles comprise copper particles or copper particles deposited on a support,
• the copper particles comprise active copper particles bound to the fiber surface and inactive copper particles partially or entirely embedded in the fiber, and
• the content ratio (CuAR) of the active copper particles represented by the following Equation 1 is 5 to 20%:
• C
• ⁢
• u
• A
• ⁢
• R
• ⁢
• (
• %
• )
• =
• C
• ⁢
• u
• A
• C
• ⁢
• u
• T
• ×
• 100.
• Equation
• ⁢
• 1
• in Equation 1, CuT and CuA are each the content (ppm) of copper particles measured using an inductively coupled plasma (ICP) analyzer,
• wherein CuT is the content of total copper particles contained in an antimicrobial filter measured by putting 0.1 g of the antimicrobial filter in a mixed solution of HNO3 and H2O2 and pre-treating it with a microwave at 2,450 MHz at 200° C. for 20 minutes, and
• CuA is the content of active copper particles measured by putting 0.1 g of the antimicrobial filter in an HNO;
• solution and treating it with acid at 25° C. for 720 minutes
• wherein the copper particles deposited on a support have an average particle diameter (D50) of 1 to 10 nm,
• the support comprises at least one selected from calcium carbonate and quartz, and
• the support has an average particle diameter (D50) of 1 to 5 μm.

A process for preparing an antimicrobial filter, which comprises:

• a first step of mixing and extruding antimicrobial particles and a first polymer resin to obtain a first masterbatch;
• a second step of mixing the first masterbatch with second polymer resin pellets to obtain a mixture;
• and
• a third step of melt-spinning the mixture,
• wherein the antimicrobial filter comprises a fiber formed from a polymer resin and antimicrobial particles,
• the antimicrobial particles comprise spherical copper particles or copper particles deposited on a support,
• the spherical copper particles or copper particles deposited on a support comprise active copper particles bound to the fiber surface and inactive copper particles partially or entirely embedded in the fiber, and
• the content ratio (CuAR) of the active copper particles represented by the above Equation 1 is 5 to 20%:
• C
• ⁢
• u
• A
• ⁢
• R
• ⁢
• (
• %
• )
• =
• C
• ⁢
• u
• A
• C
• ⁢
• u
• T
• ×
• 100.
• Equation
• ⁢
• 1
• in Equation 1, CuT and CuA are each the content (ppm) of copper particles measured using an inductively coupled plasma (ICP) analyzer,
• CuT is the content of total copper particles contained in an antimicrobial filter measured by putting 0.1 g of the antimicrobial filter in a mixed solution of HNO3 and H2O2 and pre-treating it with a microwave at 2,450 MHz at 200° C. for 20 minutes, and
• CuA is the content of active copper particles measured by putting 0.1 g of the antimicrobial filter in an HNO3 solution and treating it with acid at 25° C. for 720 minutes.