Sheath-core conjugated fiber for supporter of water treatment separation membrane, supporter comprising same for water treatment separation membrane, water treatment separation membrane comprising same, and filter module comprising same
The present invention relates to a sheath-core conjugated fiber for a supporter of a water treatment separation membrane, the fiber being harmless to the human body without the elution of heavy metals and having excellent color transparency and strength, a supporter comprising the same for a water treatment separation membrane, a water treatment separation membrane comprising the same, and a filter module comprising the same.
1 . A sheath-core conjugated fiber for a supporter of a water treatment membrane, comprising a sheath and a core in a cross-sectional area ratio of 1:1.5 to 1:4.0,
wherein the sheath comprises a polyester resin for sheath,
wherein the polyester resin for sheath comprises a polycondensation product obtained by ester reaction and polycondensation reaction of an acid component; and a diol component,
wherein the acid component comprises 20 to 40 mol % of isophthalic acid (IPA) and the remaining amount of terephthalic acid (TPA),
wherein the diol component comprises 13 to 40 mol % of a compound represented by Chemical Formula 1-1 below and the remaining amount of a compound represented by Chemical Formula 1-4 below, or 0.1 to 5 mol % of a compound represented by Chemical Formula 1-2 below and the remaining amount of a compound represented by Chemical Formula 1-4 below:
wherein the polyester resin for sheath has a carboxyl group (—COOH) content of (1.0 to 4.0)×10 7 eg/g.
2 . A supporter for a water treatment separation membrane, comprising the sheath-core conjugated fiber of claim 1 .
3 . The supporter of claim 2 , wherein in the supporter, when a specimen which is cut from the supporter to a weight of 0.7 g is immersed in 1,000 g of deionized water (DI water) with a purity of 99.9% or higher for 100 hours and then taken out and the concentration of a heavy metal element eluted in the deionized water is measured, the elution amount of heavy metal is 1 ppm or less, and
wherein the heavy metal element has an atomic mass of 63 to 200 Da (dalton) and a density of 4.0 g/cm 3 or more.
4 . A water treatment separation membrane, comprising:
the supporter of claim 2 ;
a support layer which is formed on one or both sides of the supporter; and
an active layer which is formed on the surface of the support layer.
5 . The water treatment separation membrane of claim 4 , wherein the support layer comprises at least one selected from polysulfone polymer, polyacrylonitrile polymer and polyethersulfone polymer.