US 12,337,283 B2
Spiral-wound filter module exhibiting almost no heavy metal leaching and manufacturing method thereof
Sung Gun Cho, Gyeongsangbuk-do (KR); and Sung Pyo Hong, Gyeongsangbuk-do (KR)
Assigned to TORAY ADVANCED MATERIALS KOREA INC., Gyeongsangbuk-Do (KR)
Filed by Toray Advanced Materials Korea Inc., Gyeongsangbuk-do (KR)
Filed on Apr. 15, 2021, as Appl. No. 17/232,008.
Prior Publication US 2021/0322927 A1, Oct. 21, 2021
Int. Cl. B01D 63/10 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B01D 71/48 (2006.01); C02F 1/44 (2023.01); D01D 5/34 (2006.01); D01F 8/14 (2006.01); C02F 101/20 (2006.01)
CPC B01D 63/10 (2013.01) [B01D 63/107 (2022.08); B01D 69/105 (2013.01); B01D 69/106 (2022.08); B01D 69/107 (2022.08); B01D 69/1071 (2022.08); B01D 69/1213 (2022.08); B01D 69/1216 (2022.08); B01D 69/125 (2013.01); B01D 71/48 (2013.01); C02F 1/441 (2013.01); C02F 1/442 (2013.01); C02F 1/444 (2013.01); D01D 5/34 (2013.01); D01F 8/14 (2013.01); B01D 63/1031 (2022.08); B01D 71/481 (2022.08); B01D 2313/08 (2013.01); B01D 2313/143 (2013.01); B01D 2313/146 (2013.01); C02F 1/44 (2013.01); C02F 2101/20 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A spiral-wound filter module comprising:
a filtered-water flow channel sheet including a fabric exhibiting almost no heavy metal leaching;
a separation membrane sheet; and
an influent-water flow channel sheet,
wherein the fabric exhibiting almost no heavy metal leaching is a tricot knitted fabric formed by knitting sheath-core polyester fibers including antimony (Sb) in an amount of 1 ppb or less,
wherein each of a core-part polyester resin and a sheath-part polyester resin constituting the sheath-core polyester fibers is a resin that is polymerized by using a polymerization catalyst including only a titanium (Ti)-based catalyst,
wherein the fabric exhibiting almost no heavy metal leaching allows a heavy metal having an atomic weight of 63 g/mol to 200 g/mol and a density of 4 g/cm3 or more to be leached in a leaching amount of 1 ppb or less,
wherein the leaching amount is obtained by a specimen prepared by cutting the fabric exhibiting almost no heavy metal leaching so as to have a weight of 0.7 g is immersed in 1,000 g of deionized water (DI water) having a purity of 99.9% or more for 100 hours and then taken out, and a concentration of a metal element leached into the deionized water is measured,
wherein the sheath-part polyester resin has a melting point in the range of 150° C. to 180° C.,
wherein the core-part polyester resin and the sheath-part polyester resin are prepared by performing an esterification and a condensation polymerization of a mixture containing an acid component, a diol component, and the titanium-based catalyst,
wherein the acid component of the core-part polyester resin and the sheath-part polyester resin includes one or more selected from among terephthalic acid (TPA) and isophthalic acid,
wherein the diol component of the core-part polyester resin includes 1,4-butandiol,
wherein the sheath-core polyester fibers of the tricot knitted fabric are heat treated at 170 to 250° C. for 30 seconds to 3 minutes.