Thermoplastic polyurethane self-crimping conjugate fiber and fabric
Provided are a thermoplastic polyurethane (TPU) self-crimping conjugate fiber and a fabric. The TPU self-crimping conjugate fiber comprises: a first component including a first TPU and a second component including a second TPU, which is a TPU other than the first TPU. Wherein the first TPU has a damping factor (tanδ) peak within the temperature range from 20° C. to 100° C.; the second TPU has a tanδ peak within the temperature range from −50° C. to 70° C. Based on the total weight of the first component, the content of the first TPU is 50% by weight or more. The first TPU has a structural unit represented by Formula (I): wherein each R independently is an alkylene group having 2 to 8 carbon atoms or —CH 2 CH 2 OCH 2 CH 2 —; n is a number from 2 to 13; and the structural unit has a Mn ranging from 700 g/mole to 2500 g/mole.
1 . A thermoplastic polyurethane (TPU) self-crimping conjugate fiber comprising:
a first component including a first TPU; and
a second component including a second TPU, which is a TPU other than the first TPU;
wherein the first TPU has a damping factor (tanδ) peak within a temperature range from 20° C. to 100° C., and the second TPU has a tanδ peak within a temperature range from −50° C. to 70° C.;
wherein based on a total weight of the first component, a content of the first TPU is 50% by weight or more;
wherein the first TPU comprises a structural unit represented by Formula (I):
in Formula (I), each R independently is an alkylene group having 2 to 8 carbon atoms or —CH 2 CH 2 OCH 2 CH 2 —;
n is a number from 2 to 13; and
the structural unit represented by Formula (I) has a number-average molecular weight ranging from 700 grams per mole (g/mole) to 2500 g/mole.
2 . The TPU self-crimping conjugate fiber according to claim 1 , wherein the first TPU comprises a structural unit represented by Formula (II):
in Formula (II), each R 1 independently is an alkylene group having 2 to 8 carbon atoms or —CH 2 CH 2 OCH 2 CH 2 —;
R 2 is
and
n is a number from 2 to 13.
3 . The TPU self-crimping conjugate fiber according to claim 2 , wherein the second TPU is a TPU which has a moiety derived from an aliphatic polyol.
4 . The TPU self-crimping conjugate fiber according to claim 3 , wherein the damping factor peak of the first TPU ranges from 0.5 to 1.5.
5 . The TPU self-crimping conjugate fiber according to claim 3 , wherein the damping factor peak of the second TPU ranges from 0.1 to 0.4.
6 . The TPU self-crimping conjugate fiber according to claim 4 , wherein a difference between the damping factor peak of the first TPU and the damping factor peak of the second TPU ranges from 0.32 to 1.16.
7 . The TPU self-crimping conjugate fiber according to claim 4 , wherein the first TPU has a surface softening-sticky temperature ranging from 120° C. to 200° C.
8 . The TPU self-crimping conjugate fiber according to claim 5 , wherein the second TPU has a surface softening-sticky temperature ranging from 120° C. to 200° C.
9 . The TPU self-crimping conjugate fiber according to claim 7 , wherein the second TPU has a surface softening-sticky temperature ranging from 120° C. to 200° C.
10 . The TPU self-crimping conjugate fiber according to claim 1 , wherein based on the total weight of the first component, the content of the first TPU ranges from 60 weight percent (wt %) to 100 wt %.
11 . The TPU self-crimping conjugate fiber according to claim 6 , wherein based on the total weight of the first component, the content of the first TPU ranges from 60 wt % to 100 wt %.
12 . The TPU self-crimping conjugate fiber according to claim 9 , wherein based on the total weight of the first component, the content of the first TPU ranges from 60 wt % to 100 wt %.
13 . The TPU self-crimping conjugate fiber according to claim 1 , wherein a volume ratio of the first component to the second component ranges from 3:7 to 7:3.
14 . The TPU self-crimping conjugate fiber according to claim 6 , wherein a volume ratio of the first component to the second component ranges from 3:7 to 7:3.
15 . The TPU self-crimping conjugate fiber according to claim 9 , wherein a volume ratio of the first component to the second component ranges from 3:7 to 7:3.
16 . The TPU self-crimping conjugate fiber according to claim 1 , wherein the TPU self-crimping conjugate fiber has a multifilament structure.
17 . The TPU self-crimping conjugate fiber according to claim 12 , wherein the TPU self-crimping conjugate fiber has a multifilament structure.
18 . A fabric comprising the TPU self-crimping conjugate fiber according to claim 1 .
19 . The fabric according to claim 18 , wherein the fabric is made by weaving or knitting.
20 . The fabric according to claim 18 , wherein the fabric is made by circular knitting.