Fibrous structure containing elastic polyurethane yarn

Abstract

The present invention relates to a fiber structure including an elastic polyurethane yarn. The elastic polyurethane yarn contains: 0.5 to 10 mass % of a cationic high-molecular-weight compound A having a number-average molecular weight of 2000 or more; and an inorganic chlorine deterioration inhibitor B. The mass ratio of the cationic high-molecular-weight compound A to the inorganic chlorine deterioration inhibitor B ranges from 0.3 to 3, and a silicone oil is applied to the elastic polyurethane yarn. The fiber structure is treated with water repellent finishing. The fiber structure preferably includes an elastic polyurethane yarn whose ratio of fluorine (F) to carbon (C) on the elastic polyurethane yarn is 0.030 or more in an elemental mass concentration according to scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX). Thereby, it is possible to provide a fiber structure having high water repellency and keeping a low water retention rate when immersed in water for an extended time.

1 . A fiber structure comprising an elastic polyurethane yarn,
 wherein the elastic polyurethane yarn comprises:   0.5 to 10% by mass of a cationic high-molecular-weight compound A having a number-average molecular weight of 2000 or more; and   an inorganic chlorine deterioration inhibitor B,   a mass ratio of the cationic high-molecular-weight compound A to the inorganic chlorine deterioration inhibitor B ranges from 0.3 to 3,   a silicone oil is applied to the elastic polyurethane yarn, and   the fiber structure is treated with water repellent finishing.   
     
     
         2 . The fiber structure according to  claim 1 , wherein the fiber structure comprises an elastic polyurethane yarn whose ratio of fluorine (F) to carbon (C) on the elastic polyurethane yarn is 0.030 or more in an elemental mass concentration according to scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX). 
     
     
         3 . The fiber structure according to  claim 1 , wherein the fiber structure comprises 1 to 99% by mass of the elastic polyurethane yarn. 
     
     
         4 . The fiber structure according to  claim 1 , wherein the fiber structure has a water repellency of grade 4 or higher in the spray test according to JIS L 1092. 
     
     
         5 . The fiber structure according to  claim 1 , wherein the fiber structure has a water retention rate after 60 minutes of 50% by mass or less of the mass of the fiber structure. 
     
     
         6 . The fiber structure according to  claim 1 , wherein the elastic polyurethane yarn is covered with another synthetic fiber yarn. 
     
     
         7 . The fiber structure according to  claim 1 , wherein the fiber structure comprises a polyamide fiber yarn or a polyester fiber yarn. 
     
     
         8 . The fiber structure according to  claim 1 , wherein the fiber structure has a tearing strength of 8 N or more according to JIS L 1096. 
     
     
         9 . The fiber structure according to  claim 1 , wherein the fiber structure has a bursting strength of 200 kPa or more according to JIS L 1096. 
     
     
         10 . The fiber structure according to  claim 1 , wherein the fiber structure is at least one of a woven fabric or a knitted fabric. 
     
     
         11 . The fiber structure according to  claim 1 , wherein the fiber structure is a fabric for a swimsuit. 
     
     
         12 . The fiber structure according to  claim 1 , wherein the inorganic chlorine deterioration inhibitor B is an oxide, a carbon oxide, a complex oxide or a solid solution of at least one element selected from the group consisting of Zn, Mg, Ca and Al. 
     
     
         13 . The fiber structure according to  claim 1 , wherein the cationic high-molecular-weight compound A is a compound having a tertiary amino group and having neither a primary amino group nor a secondary amino group in its molecular structure. 
     
     
         14 . The fiber structure according to  claim 1 , wherein the elastic polyurethane yarn further comprises 0.3 to 4% by mass of a partially hindered phenol-based antioxidant. 
     
     
         15 . The fiber structure according to  claim 1 , wherein the silicone oil comprises 50% by mass or more of at least one silicone selected from the group consisting of dimethyl silicone and a modified silicone.