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.

Description

CROSS REFERENCE TO THE RELATED APPLICATIONS

This application is the national phase entry of International Application No. PCT/CN2020/095716, filed on Jun. 12, 2020, which is based upon and claims priority to Chinese Patent Application No. 201911386331.2, filed on Dec. 29, 2019, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention belongs to the field of polyester fiber, and more particularly, relates to one type of fiber for medical antibacterial fabric and preparation method therefor.

BACKGROUND

With the enhancement of medical and health services, more and more medical textiles have been produced. The requirements of medical textiles are different from those of clothing textiles, mainly reflected in antibacterial properties and practicality. The clothing textiles generally use a variety of raw materials to meet consumers' demand for comfortable wearing, but most medical textiles are disposable discards, so that choosing raw materials as few as possible can reduce processing and costs. Polyester fibers are widely used in medical textiles due to a variety of modifications and deformations, but the elasticity in polyester fibers generally comes from the false-twist texturing process or the bicomponent spinning process, both of which increase the cost greatly.

Therefore, it is of great significance to develop one type of fiber for medical fabric with simple process and crimp shrinkage.

SUMMARY

The primary object of the present invention is to provide one type of fiber for medical antibacterial fabric and preparation method therefor, so as to solve the problem of complicated processing process of polyester fiber in medical fabric to achieve crimp shrinkage in the prior art.

To this end, the technical schemes of the invention are as follows:

The method for preparing a fiber for medical antibacterial fabric, comprising that 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 the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment;

wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:(1.5-2.5):(1.5-2.5), while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is (2.5-3.5):1, and the angle between center lines of two adjacent leaves is 120°; wherein 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;

That is, the spinneret is equipped with multiple trilobal spinneret holes, each trilobal spinneret hole contains leaf I, leaf II, and leaf III, and the leaf I is the shortest of the three leaves in all the different trilobal spinneret holes; the ratio of lengths of leaf I, leaf II, and leaf III from the same trilobal spinneret hole is 1.0:(1.5-2.5):(1.5-2.5), while the widths of three leaves are the same, and the ratio of the length to the width of leaf I is (2.5-3.5):1; in the same trilobal spinneret hole, the angle between center lines of leaf I and leaf II is 120°, the angle between center lines of leaf II and leaf III is 120°, and the angle between center lines of leaf I and leaf III is 120°; the shapes and sizes of three leaves from different trilobal spinneret holes are the same, and the direction of leaf I in each trilobal spinneret hole is randomly distributed;

The following preferred technology program is presented to give a detailed description for this invention.

In the method for preparing a fiber for medical antibacterial fabric, wherein the antibacterial polyester melt has an intrinsic viscosity of 0.50-0.55 dL/g;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent with a content of 100-300 ppm of silver ions;

wherein the FDY process involves technological parameters: a spinning temperature of 270-280° C., a cooling temperature of 20-25° C., a cooling wind speed of 1.80-2.30 m/s, a godet roller 1 speed of 1800-2000 m/min, a godet roller 1 temperature of 85-95° C., a godet roller 2 speed of 2700-2900 m/min, a godet roller 2 temperature of 150-170° C., and a winding speed of 2640-2830 m/min;

wherein the relaxation heat treatment has a temperature of 90-120° C., and a time of 20-30 min.

The fiber for medical antibacterial fabric is prepared by any one of the above methods, wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section.

Prepared through the preferred technology program mentioned above, wherein the fiber for medical antibacterial fabric comprises mechanical performance indices measured according to GB/T6506-2001 as 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%.

wherein the fiber for 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.

The principle of the present invention is as follows:

The fiber for medical antibacterial fabric in the present invention is prepared according to the FDY process, which is extruding an antibacterial polyester melt from a trilobal spinneret hole with unequal lengths, while cooling by ring-blowing; due to the asymmetric structure of the trilobal spinneret hole, the surface of the leaf first facing the wind in contact with the cooling wind is the entire surface of the leaf, and the surfaces of the other two leaves in contact with the cooling wind are only the windward surfaces; therefore the cooling speed of the melt at different positions in the cross-section is different after extruding the fiber, specially during spinning, the cooling wind speed is between 1.80-2.30 m/s, wherein the high speed makes the part close to the air outlet cool faster, and the part far from the air outlet cool slower. When one of the three leaves of the trilobal spinneret hole directly facing the cooling air, the melt of the leaf cools quickly, while the rest of the trilobal spinneret hole cools slowly, which is more easily drawn and thinner under the tension of drafting, and its stress is more concentrated, wherein the fiber with asymmetric stress and thickness in the cross-section has three-dimensional crimp properties during heat treatment or stretching, and curls well with a high fiber elastic recovery rate.

Moreover, in a bundle of filaments, the crimp directions of the monofilaments are inconsistent, because 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, then the direction of stress asymmetry is also different, and the direction of crimp is different, therefore, the monofilaments with inconsistent crimp directions will produce “out-of-order” in a bundle of filaments, making the bundle of filaments feel more fluffy and plump.

Benefits

(1) The method for preparing a fiber for medical antibacterial fabric in the present invention, uses a spinneret with asymmetric trilobal spinneret hole for the FDY spinning process, resulting in asymmetrical stresses in the cross-section of the fiber during cooling, making the fibers for medical antimicrobial fabric have three-dimensional self-crimping properties.

(2) The fiber for medical antibacterial fabric in the present invention, has stable crimp shrinkage after relaxation heat treatment, realizing crimp elasticity of single-component polyester fiber without false-twist texturing process.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the structure of the trilobal spinneret hole in the present invention;

FIG. 2 is a schematic diagram of the distribution of the trilobal spinneret holes on a spinneret in the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Based on above mentioned method, the following embodiments are carried out for further demonstration in the present invention. It is to be understood that these embodiments are only intended to illustrate the invention and are not intended to limit the scope of the invention. In addition, it should be understood that after reading the contents described in the present invention, those technical personnel in this field can make various changes or modifications to the invention, and these equivalent forms also fall within the scope of the claims attached to the application.

The shapes and distributions of trilobal spinneret holes on the spinneret in the present invention are shown in FIGS. 1-2, wherein the spinneret hole on the spinneret is trilobal, wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:(1.5-2.5):(1.5-2.5), while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is (2.5-3.5):1, and the angle between center lines of two adjacent leaves is 120°; wherein 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.

FIGS. 1-2 are for illustration only and should not be construed as limiting the present invention.

Example 1

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5.4 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:1.7:1.5, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 3.3:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 24, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 10°, 60°, 2°, 30°, 90°, 15°, 22°, 90°, 1°, 3°, 170°, 40°, 45°, 30°, 10°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 100 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 109° C. and a time of 21 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 278° C., a cooling temperature of 23° C., a cooling wind speed of 2.19 m/s, a godet roller 1 speed of 1960 m/min, a godet roller 1 temperature of 92° C., a godet roller 2 speed of 2800 m/min, a godet roller 2 temperature of 163° C., and a winding speed of 2740 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 26%, a crimp stability of 80%, a shrinkage elongation of 57%, and a crimp elastic recovery rate of 70%; a breaking strength of 2.4 cN/dtex, an elongation at break of 60%, and a monofilament fineness of 1.10 dtex.

Example 2

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5.5 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:1.5:1.9, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 2.8:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 24, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 28°, 162°, 64°, 3°, 6°, 105°, 22°, 90°, 1°, 3°, 170°, 40°, 45°, 30°, 10°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 300 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 109° C. and a time of 20 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 278° C., a cooling temperature of 23° C., a cooling wind speed of 2.19 m/s, a godet roller 1 speed of 1970 m/min, a godet roller 1 temperature of 92° C., a godet roller 2 speed of 2820 m/min, a godet roller 2 temperature of 168° C., and a winding speed of 2760 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 26%, a crimp stability of 80%, a shrinkage elongation of 58%, and a crimp elastic recovery rate of 70%; a breaking strength of 2.45 cN/dtex, an elongation at break of 58%, and a monofilament fineness of 1.20 dtex.

Example 3

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5.4 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:2.0:2.5, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 3.5:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 30, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 10°, 60°, 2°, 30°, 90°, 15°, 22°, 90°, 1°, 3°, 170°, 40°, 45°, 30°, 10°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°, 28°, 162°, 64°, 3°, 6°, 105°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 290 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 104° C. and a time of 23 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 277° C., a cooling temperature of 23° C., a cooling wind speed of 2.12 m/s, a godet roller 1 speed of 1930 m/min, a godet roller 1 temperature of 91° C., a godet roller 2 speed of 2780 m/min, a godet roller 2 temperature of 161° C., and a winding speed of 2720 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 27%, a crimp stability of 78%, a shrinkage elongation of 62%, and a crimp elastic recovery rate of 71%; a breaking strength of 2.48 cN/dtex, an elongation at break of 56%, and a monofilament fineness of 1.28 dtex.

Example 4

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5.4 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:1.6:2.0, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 2.8:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 36, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 10°, 60°, 2°, 30°, 90°, 15°, 28°, 162°, 64°, 3°, 6°, 105°, 121°, 93°, 161°, 123°, 75°, 129°, 22°, 90°, 1°, 3°, 170°, 40°, 45°, 30°, 10°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 295 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 98° C. and a time of 24 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 276° C., a cooling temperature of 21° C., a cooling wind speed of 2.04 m/s, a godet roller 1 speed of 1930 m/min, a godet roller 1 temperature of 90° C., a godet roller 2 speed of 2780 m/min, a godet roller 2 temperature of 159° C., and a winding speed of 2720 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 29%, a crimp stability of 82%, a shrinkage elongation of 59%, and a crimp elastic recovery rate of 75%; a breaking strength of 2.5 cN/dtex, an elongation at break of 55%, and a monofilament fineness of 1.36 dtex.

Example 5

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5.2 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:2.5:2.4, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 2.7:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 24, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 152°, 96°, 54°, 100°, 175°, 75°, 22°, 90°, 1°, 3°, 170°, 40°, 45°, 30°, 10°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 121 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 97° C. and a time of 24 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 273° C., a cooling temperature of 21° C., a cooling wind speed of 2.01 m/s, a godet roller 1 speed of 1890 m/min, a godet roller 1 temperature of 89° C., a godet roller 2 speed of 2770 m/min, a godet roller 2 temperature of 158° C., and a winding speed of 2710 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 29%, a crimp stability of 78%, a shrinkage elongation of 55%, and a crimp elastic recovery rate of 74%; a breaking strength of 2.55 cN/dtex, an elongation at break of 54%, and a monofilament fineness of 1.44 dtex.

Example 6

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:2.2:2.5, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 3:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 24, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 166°, 40°, 23°, 138°, 112°, 55°, 180°, 53°, 174°, 142°, 131°, 87°, 49°, 90°, 65°, 5°, 74°, 161°, 30°, 158°, 45°, 109°, 23°, 47°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 193 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 97° C. and a time of 27 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 271° C., a cooling temperature of 20° C., a cooling wind speed of 2 m/s, a godet roller 1 speed of 1880 m/min, a godet roller 1 temperature of 88° C., a godet roller 2 speed of 2770 m/min, a godet roller 2 temperature of 153° C., and a winding speed of 2710 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 29%, a crimp stability of 78%, a shrinkage elongation of 58%, and a crimp elastic recovery rate of 73%; a breaking strength of 2.56 cN/dtex, an elongation at break of 53%, and a monofilament fineness of 1.50 dtex.

Example 7

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:1.5:2.0, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 2.9:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 48, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 10°, 60°, 2°, 30°, 90°, 15°, 22°, 90°, 1°, 3°, 170°, 40°, 45°, 30°, 10°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°, 166°, 40°, 23°, 138°, 112°, 55°, 180°, 53°, 174°, 142°, 131°, 87°, 49°, 90°, 65°, 5°, 74°, 161°, 30°, 158°, 45°, 109°, 23°, 47°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 201 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 90° C. and a time of 30 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 270° C., a cooling temperature of 20° C., a cooling wind speed of 1.8 m/s, a godet roller 1 speed of 1800 m/min, a godet roller 1 temperature of 85° C., a godet roller 2 speed of 2700 m/min, a godet roller 2 temperature of 150° C., and a winding speed of 2640 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 28%, a crimp stability of 82%, a shrinkage elongation of 61%, and a crimp elastic recovery rate of 72%; a breaking strength of 2.59 cN/dtex, an elongation at break of 52%, and a monofilament fineness of 1.00 dtex.

Example 8

A method for preparing a fiber for medical antibacterial fabric, comprising:

(1) cooling an antibacterial polyester melt (intrinsic viscosity of 5.5 dL/g) by ring-blowing after extruded from a trilobal spinneret hole on a spinneret; wherein a ratio of lengths of three leaves from the same trilobal spinneret hole is 1.0:2.0:2.5, while the widths of three leaves are the same, wherein the ratio of the length to the width of the shortest leaf is 2.5:1, and the angle between center lines of two adjacent leaves is 120°; wherein the shapes and sizes of three leaves from different trilobal spinneret holes are the same; wherein the spinneret is equipped with a circle of equally spaced trilobal spinneret holes, the number of which is 24, and taking the central axis of the shortest leaf of one of the trilobal spinneret holes as the reference line, all the central axises of the shortest leaves of other trilobal spinneret holes are at a certain angle with the reference line, along the clockwise direction, the included angles of the inferior angles are 10°, 60°, 2°, 30°, 90°, 15°, 22°, 90°, 1°, 3°, 170°, 40°, 45°, 30°, 10°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;

wherein the antibacterial polyester mainly consists of polyester and antibacterial agents dispersed in it, wherein the antibacterial agent is a silver-based antibacterial agent RHA-02 with a content of 202 ppm of silver ions;

(2) manufacturing a fully drawn yarn according to the FDY process, then the fiber for medical antibacterial fabric is prepared after a relaxation heat treatment at a temperature of 120° C. and a time of 20 minutes;

wherein the FDY process involves technological parameters as a spinning temperature of 280° C., a cooling temperature of 25° C., a cooling wind speed of 2.3 m/s, a godet roller 1 speed of 2000 m/min, a godet roller 1 temperature of 95° C., a godet roller 2 speed of 2900 m/min, a godet roller 2 temperature of 170° C., and a winding speed of 2830 m/min;

wherein the prepared fiber for medical antibacterial fabric has a three-dimensional crimp shape, and comprises a plurality of antibacterial polyester monofilaments with trilobal cross-section; wherein the fiber for medical antibacterial fabric comprises mechanical performance indices as a crimp shrinkage of 28%, a crimp stability of 82%, a shrinkage elongation of 58%, and a crimp elastic recovery rate of 72%; a breaking strength of 2.6 cN/dtex, an elongation at break of 50%, and a monofilament fineness of 1.10 dtex.

Claims

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.