Fiber for medical antibacterial fabric and preparation method therefor

Abstract

A preparation method of fibers for medical antibacterial fabric includes cooling an antibacterial polyester melt by ring-blowing after extruded from a trilobal spinneret hole on a spinneret, and manufacturing a fully drawn yarn (FDY), then performing a relaxation heat treatment to obtain the fiber. The shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein all the trilobal spinneret holes are distributed in concentric circles, and the direction of the shortest leaf in each trilobal spinneret hole is randomly distributed. The prepared fiber has a three-dimensional crimp shape and includes antibacterial polyester monofilaments with trilobal cross-section. The fiber has mechanical performance indices as a crimp shrinkage of 26-29%, a crimp stability of 78-82%, a shrinkage elongation of 55-62%, a crimp elastic recovery rate of 70-75%, a breaking strength of 2.4-2.6 cN/dtex, an elongation at break of 55.0±5.0%, and a monofilament fineness of 1.00-1.50 dtex.

What is claimed is: 
     
         1 . A method for preparing a fiber for a medical antibacterial fabric,
 comprising: cooling an antibacterial polyester melt by ring-blowing after extruded from a trilobal spinneret hole on a spinneret, and manufacturing a fully drawn yarn (FDY) according to an FDY process, then performing a relaxation heat treatment to obtain the fiber for the medical antibacterial fabric;   wherein a ratio of lengths of three leaves from a same trilobal spinneret hole is 1.0:(1.5-2.5):(1.5-2.5), while widths of the three leaves are same, wherein a ratio of a length to a width of a shortest leaf is (2.5-3.5):1, and an angle between center lines of two adjacent leaves is 120; wherein shapes and sizes of three leaves from different trilobal spinneret holes are same;   wherein all the trilobal spinneret holes are distributed in concentric circles, and a direction of the shortest leaf in each trilobal spinneret hole is randomly distributed;   wherein the ring-blowing cooling has a cooling temperature of 20-25° C. and a cooling wind speed of 1.80-2.30 m/s;   wherein the fiber for the medical antibacterial fabric has a three-dimensional crimp shape, and in a bundle of filaments, crimp directions of monofilaments are inconsistent.   
     
     
         2 . The method of  claim 1 , wherein the antibacterial polyester melt has an intrinsic viscosity of 0.50-0.55 dL/g. 
     
     
         3 . The method of  claim 2 , wherein the antibacterial polyester melt mainly consists of a polyester and an antibacterial agent dispersed in the polyester, wherein the antibacterial agent is a silver-based antibacterial agent with a content of 100-300 ppm of silver ions. 
     
     
         4 . The method of  claim 3 , wherein the FDY process involves technological parameters: a spinning temperature of 270-280° C., a first godet roller speed of 1800-2000 m/min, a first godet roller temperature of 85-95° C., a second godet roller speed of 2700-2900 m/min, a second godet roller temperature of 150-170° C., and a winding speed of 2640-2830 m/min. 
     
     
         5 . The method of  claim 1 , wherein the relaxation heat treatment has a temperature of 90-120° C. and a time of 20-30 min. 
     
     
         6 . A fiber for a medical antibacterial fabric prepared by the method of  claim 1 , wherein the fiber for the medical antibacterial fabric has the three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section. 
     
     
         7 . The fiber for the medical antibacterial fabric of  claim 6 , wherein the fiber for the medical antibacterial fabric comprises mechanical performance indices: a crimp shrinkage of 26-29%, a crimp stability of 78-82%, a shrinkage elongation of 55-62%, and a crimp elastic recovery rate of 70-75%. 
     
     
         8 . The fiber for the medical antibacterial fabric of  claim 6 , wherein the fiber for the medical antibacterial fabric comprises mechanical performance indices: a breaking strength of 2.4-2.6 cN/dtex, an elongation at break of 55.0±5.0%, and a monofilament fineness of 1.00-1.50 dtex. 
     
     
         9 . The fiber for the medical antibacterial fabric of  claim 6 , wherein during a preparation of the fiber, the antibacterial polyester melt has an intrinsic viscosity of 0.50-0.55 dL/g. 
     
     
         10 . The fiber for the medical antibacterial fabric of  claim 9 , wherein during the preparation of the fiber, the antibacterial polyester melt mainly consists of a polyester and an antibacterial agent dispersed in the polyester, wherein the antibacterial agent is a silver-based antibacterial agent with a content of 100-300 ppm of silver ions. 
     
     
         11 . The fiber for the medical antibacterial fabric of  claim 10 , wherein during the preparation of the fiber, the FDY process involves technological parameters: a spinning temperature of 270-280° C., a first godet roller speed of 1800-2000 m/min, a first godet roller temperature of 85-95° C., a second godet roller speed of 2700-2900 m/min, a second godet roller temperature of 150-170° C., and a winding speed of 2640-2830 m/min. 
     
     
         12 . The fiber for the medical antibacterial fabric of  claim 6 , wherein during the preparation of the fiber, the relaxation heat treatment has a temperature of 90-120° C. and a time of 20-30 min.