A hydrophilic quick-drying composite elastic antibacterial polyester fiber and a preparation method thereof

Abstract

The application belongs to the field of textile material science and fiber preparation technology, and particularly relates to a hydrophilic quick-drying composite elastic antibacterial polyester fiber and a preparation method. The fiber has a cross-shaped section structure and is prepared by parallel composite spinning of polytrimethylene terephthalate chips and antibacterial polyethylene terephthalate polymers at a weight ratio of 40:60 to 60:40. The application adopts high-temperature-resistant organic imidazole antibacterial agent modified by sodium terephthalate-2-sulfonate, and combines with high-hydrophilic sorbitol copolymer modified PET chips to improve the antibacterial performance and the hydrophilicity of PET, thereby improving the hydrophilicity and antibacterial property of the antibacterial polyester fiber. The antibacterial agent is copolymerized with the PET monomer, so that the antibacterial agent becomes part of the PET molecular chain, and the fiber and the textile have high and durable antibacterial performance against washing. Meanwhile, the fiber section processed by the spinneret designed by the application has an excellent wet-conducting and quick-drying function, and has good spinnability.

Description

Technical Field

[0001] The invention belongs to the field of textile material science and fiber preparation technology, and particularly relates to a hydrophilic quick-drying composite elastic antibacterial polyester fiber and a preparation method thereof. Background Art

[0002] Spandex, due to its exceptional high elasticity, excellent hand feel, and resistance to deformation, has become an indispensable elastic fiber material for stretch knitted fabrics. However, spandex also has several significant drawbacks, including poor moisture absorption, difficulty drying naturally, inability to be used independently (usually requiring blending with other fibers), relatively high cost, poor heat resistance (resulting in poor breathability and prone to sweating in summer), poor dyeability and sensitivity to chlorine, and weaker abrasion resistance than most mainstream fibers. These problems often lead to spandex breakage, loss of elasticity, and whitening in clothing (especially underwear) after a period of use.

[0003] In response to these shortcomings of spandex, a method has been developed on the market that combines two polymers with different thermal shrinkage properties, extrudes them through spinneret holes and bonds them side by side into single fibers, and then shrinks them by heating to form a three-dimensional spirally curled composite elastic fiber. Such fibers can be used alone to weave fabrics. For example, patent CN102127821B discloses a production process for modified PET / PTT elastic fibers, which uses thickened PTT and PET slices, adopts a peanut-shaped parallel cross-sectional structure, and mixes PTT into the PET component, aiming to solve the spinning stability problem of existing process products. The produced fibers have excellent high elastic recovery properties. However, the composite elastic fibers of this invention perform poorly in terms of hydrophilicity and quick-drying properties.

[0004] To improve the hydrophilicity and quick-drying property of composite elastic fibers, common strategies include modifying PET or PTT to enhance their hydrophilicity, and using profiled spinnerets to manufacture fibers with profiled cross-sections to improve moisture conduction and quick-drying performance. Patent CN114908437B discloses a moisture-conducting and quick-drying self-crimping elastic fiber, its preparation method and application. Using polytrimethylene terephthalate and polyethylene terephthalate as raw materials, by regulating the cross-sectional shape of the composite monofilament to make it show significant changes, adopting an arc design of multi-groove and its own contour structure, and strictly controlling the distance from the points on the outer contour line to the centroid of the cross-section and the length-width ratio of the protrusions to achieve excellent moisture-conducting and quick-drying performance. Nevertheless, only half of the fibers of this invention have a grooved cross-section, and the other half remains circular, so the improvement of its quick-drying property is limited, and the raw materials are not modified, lacking hydrophilicity and antibacterial properties. In addition, Utility Model Patent CN209652480U introduces a profiled spinneret for并列复合纤维用异形喷丝板, using a double-cross structure to form a "艹" cross-sectional structure. Although it can improve moisture conduction and quick-drying performance, due to the too small area of the connection part between the two components, 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the antibacterial polyethylene terephthalate polymer contains an antibacterial agent selected from

[0012]

[0013] [C8][STPA] [C10][STPA] [C12][STPA]

[0014]

[0015] [C14][STPA] [C16][STPA] [C18][STPA]

[0016] At least one of .

[0017] The present invention also provides a method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber, the preparation method comprising the following steps:

[0018] (1) Preparation of antibacterial polyethylene terephthalate polymer: Ethylene glycol and purified terephthalic acid are added to a beating kettle respectively, with the acid / alcohol molar ratio being 1:1.25-1.55, and then sorbitol, antibacterial agent, stabilizer, catalyst and titanium dioxide additive are added respectively to form a uniform slurry, which is pumped into an esterification kettle for esterification reaction. The esterification reaction is carried out at normal pressure to 0.01 MPa, and the esterification temperature is controlled between 245 and 255°C; the reaction endpoint is determined based on the time when the amount of esterification water distilled reaches the calculated value, and the amount of esterification water distilled is calculated by the following formula: Esterification water amount (kg) = total molar number of acid components in the reaction system × 36 × 98%;

[0019] After the esterification reaction, a polycondensation reaction is carried out, which is divided into a low vacuum stage and a high vacuum stage. In the low vacuum stage, the pressure is steadily pumped from atmospheric pressure to an absolute pressure of less than 1 kPa, and the temperature is controlled between 255 and 270°C. In the high vacuum stage, the vacuum is continued to be pumped to an absolute pressure of less than 50 Pa, the reaction temperature is controlled between 270 and 287°C, and the terminal discharge temperature is strictly controlled at 285 to 287°C. The polymer is discharged when it reaches the target viscosity value, and then underwater pelletized and dried to obtain antibacterial polyethylene terephthalate polymer chips.

[0020] The preparation process steps of the antibacterial agent are as follows:

[0021] Deionized water, accounting for 97% of the total mass, is added to a reaction vessel, followed by addition of sodium 5-sulfoterephthalate and at least one of 1-octa-, deca-, dodeca-, tetradeca-, hexadeca-, or octadecyl-3-methylimidazole bromide at a molar ratio of 1.05:1. The mixture is stirred and reacted for 2.5 hours at room temperature and pressure. The mixture is centrifuged to remove water, and the collected white solid powder is washed with deionized water three or more times. The mixture is then vacuum dried to obtain a white powdery antibacterial agent.

[0022] (2) Spinning: Polypropylene terephthalate chips and antibacterial polyethylene terephthalate polymer chips are taken separately, dried until the moisture content reaches below 30ppm, and then enter their respective single-screw extruders for melt extrusion. The melt passes through a filter and a metering pump and enters a composite spinning assembly. The melt is merged at the outlet of the spinneret to form a parallel composite spinning polyester fiber with a cross-shaped cross-section. The polyester fiber is cooled, oiled, drawn, shaped, and processed into fully stretched yarn FDY or polyester low-elastic yarn DTY.

[0023] Furthermore, in step (2), the surface of the spinneret is provided with a plurality of first spinneret hole groups and a second spinneret hole group;

[0024] The plurality of first spinneret hole groups and the second spinneret hole groups are arranged at equal intervals along the circumferential direction of the spinneret plate;

[0025] The first spinneret hole group is arranged in an outer ring on the spinneret surface, and the second spinneret hole group is arranged in an inner ring on the spinneret surface;

[0026] The first spinneret hole group and the second spinneret hole group are set to be the same in number and aperture, and the first spinneret hole group and the second spinneret hole group are set correspondingly;

[0027] The first spinneret group is provided with a first spinneret flow trough, a first spinneret cylindrical guide hole, a first spinneret conical guide hole, and a first spinneret micro-hole;

[0028] The first spinneret flow trough is arranged on the top surface of the spinneret, and the first spinneret micropores are arranged on the bottom surface of the spinneret;

[0029] The first spinneret flow trough and the first spinneret micropores are connected and communicated with each other through the first spinneret cylindrical guide hole and the first spinneret conical guide hole in sequence;

[0030] The second spinneret group has the same structural arrangement as the first spinneret group, including a second spinneret flow trough, a second spinneret cylindrical guide hole, a second spinneret conical guide hole, and a second spinneret micro-hole.

[0031] wherein the distance between the first spinneret flow channel and the second spinneret flow channel is greater than the distance between the first spinneret micropore and the second spinneret micropore;

[0032] The first spinneret micropores and the second spinneret micropores are both semi-cross shaped, the two semi-cross shapes are identical and symmetrically arranged, and the side surfaces of the two semi-cross shapes in opposite directions are arranged in an arc shape.

[0033] Furthermore, the sorbitol content in the antibacterial polyethylene terephthalate polymer is 0.5-2 wt%.

[0034] Furthermore, the content of the antibacterial agent in the antibacterial polyethylene terephthalate polymer is 1 to 5 wt%.

[0035] Furthermore, the stabilizer in the antibacterial polyethylene terephthalate polymer is trimethyl phosphate (TMP), and its content is 120-300 ppm.

[0036] Furthermore, the catalyst in the antibacterial polyethylene terephthalate polymer is ethylene glycol antimony, and its content is 300-550 ppm.

[0037] Furthermore, the titanium dioxide content in the antibacterial polyethylene terephthalate polymer is 0 to 3 wt%.

[0038] Furthermore, the intrinsic viscosity of the poly(trimethylene terephthalate) chips is 1.0-1.2 dl / g, and the intrinsic viscosity of the antibacterial polyethylene terephthalate polymer chips is 0.4-0.55 dl / g.

[0039] The hydrophilic quick-drying composite elastic antibacterial polyester fiber can be woven alone or interwoven with other yarns to make woven fabrics or knitted fabrics.

[0040] (3) Beneficial effects

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The antibacterial PET sheet of the present invention adopts an organic imidazole antibacterial agent modified with sodium 2-sulfonate terephthalate with high temperature resistance, and is copolymerized with highly hydrophilic sorbitol to make the PET slice not only have good antibacterial properties, but also improve the hydrophilicity of PET, thereby improving the hydrophilicity of the prepared antibacterial polyester fiber and having better antibacterial properties.

[0043] 2. The antibacterial agent of the present invention undergoes a copolymerization reaction with the monomer of PET, and the antibacterial agent becomes a part of the PET molecular chain. The antibacterial agent has the same lifespan as the main substrate, so the processed antibacterial polyester fibers and textiles have high durable and washable antibacterial properties.

[0044] 3. The cross section of the fiber processed by the spinneret designed in the present invention is cross-shaped, and each fiber has four grooves, which has good moisture conduction and quick-drying functions. The spinneret is simple to process and has good spinnability. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0046] Figure 1 is a front view of the spinneret of the present invention;

[0047] Figure 2 is a side cross-sectional view of the spinneret of the present invention;

[0048] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0049] Figure 4 The spinneret of the present invention Figure 3 A magnified view of the spinneret microhole outlet in the middle B direction;

[0050] Figure 5 This is a cross-sectional view of the fiber produced by the spinneret of the present invention.

[0051] The markings in the accompanying drawings are: 1-spinneret, a-first spinneret group, b-second spinneret group, a1-first spinneret flow trough, b1-second spinneret flow trough, a2-first spinneret cylindrical guide hole, b2-second spinneret cylindrical guide hole, a3-first spinneret conical guide hole, b3-second spinneret conical guide hole, a4-first spinneret micropore, b4-second spinneret micropore. DETAILED DESCRIPTION

[0052] In this technical solution:

[0053] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0054] In the following, polytrimethylene terephthalate is PTT, and antibacterial polyethylene terephthalate polymer is antibacterial PET;

[0055] The present invention provides a hydrophilic quick-drying composite elastic antibacterial polyester fiber, the fiber having a cross-shaped cross-sectional structure ( Figure 5 As shown), and is prepared by parallel composite spinning of poly(trimethylene terephthalate) chips and antibacterial polyethylene terephthalate polymer in a weight ratio of 40:60 to 60:40.

[0056] Wherein, the antibacterial polyethylene terephthalate polymer contains an antibacterial agent selected from

[0057]

[0058] [C8][STPA] [C10][STPA] [C12][STPA]

[0059]

[0060] [C14][STPA] [C16][STPA] [C18][STPA]

[0061] At least one of .

[0062] The present invention also provides a method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber, the preparation method comprising the following steps:

[0063] (1) Preparation of antibacterial polyethylene terephthalate polymer: Ethylene glycol and purified terephthalic acid are added to a beating kettle respectively, with the acid / alcohol molar ratio being 1:1.25-1.55, and then sorbitol, antibacterial agent, stabilizer, catalyst and titanium dioxide additive are added respectively to form a uniform slurry, which is pumped into an esterification kettle for esterification reaction. The esterification reaction is carried out at normal pressure to 0.01 MPa, and the esterification temperature is controlled between 245 and 255°C; the reaction endpoint is determined based on the time when the amount of esterification water distilled reaches the calculated value, and the amount of esterification water distilled is calculated by the following formula: Esterification water amount (kg) = total molar number of acid components in the reaction system × 36 × 98%;

[0064] After the esterification reaction, a polycondensation reaction is carried out, which is divided into a low vacuum stage and a high vacuum stage. In the low vacuum stage, the pressure is steadily pumped from atmospheric pressure to an absolute pressure of less than 1 kPa, and the temperature is controlled between 255 and 270°C. In the high vacuum stage, the vacuum is continued to be pumped to an absolute pressure of less than 50 Pa, the reaction temperature is controlled between 270 and 287°C, and the terminal discharge temperature is strictly controlled at 285 to 287°C. The polymer is discharged when it reaches the target viscosity value, and then underwater pelletized and dried to obtain antibacterial polyethylene terephthalate polymer chips.

[0065] The preparation process steps of the antibacterial agent are as follows:

[0066] Deionized water, accounting for 97% of the total mass, is added to a reaction vessel, followed by addition of sodium 5-sulfoterephthalate and at least one of 1-octa-, deca-, dodeca-, tetradeca-, hexadeca-, or octadecyl-3-methylimidazole bromide at a molar ratio of 1.05:1. The mixture is stirred and reacted for 2.5 hours at room temperature and pressure. The mixture is centrifuged to remove water, and the collected white solid powder is washed with deionized water three or more times. The mixture is then vacuum dried to obtain a white powdery antibacterial agent.

[0067] (2) Spinning: Polypropylene terephthalate chips and antibacterial polyethylene terephthalate polymer chips are taken separately, dried until the moisture content reaches below 30ppm, and then enter their respective single-screw extruders for melt extrusion. The melt passes through a filter and a metering pump and enters a composite spinning assembly. The melt is combined at the spinneret outlet to form a parallel composite spinning polyester fiber with a cross-shaped cross section ( Figure 5 As shown in the figure), the polyester fiber is cooled, oiled, drawn, shaped, and processed into fully drawn yarn FDY or polyester low-elastic yarn DTY;

[0068] Among them, reference Figure 1-4 As shown, in step (2), the surface of the spinneret 1 is provided with a plurality of first spinneret hole groups a and second spinneret hole groups b;

[0069] A plurality of first spinneret hole groups a and second spinneret hole groups b are arranged at equal intervals along the circumferential direction of the spinneret plate 1;

[0070] The first spinneret hole group a is arranged in an outer ring on the surface of the spinneret plate 1, and the second spinneret hole group b is arranged in an inner ring on the surface of the spinneret plate 1;

[0071] The first spinneret hole group a and the second spinneret hole group b are set to have the same number and hole diameter, and the first spinneret hole group a and the second spinneret hole group b are set correspondingly;

[0072] The first spinneret group a is provided with a first spinneret flow trough a1, a first spinneret cylindrical guide hole a2, a first spinneret conical guide hole a3, and a first spinneret micro-hole a4;

[0073] The first spinneret flow groove a1 is provided on the top surface of the spinneret 1, and the first spinneret micropore a4 is provided on the bottom surface of the spinneret 1;

[0074] The first spinneret flow channel a1 and the first spinneret micropore a4 are connected and communicated with each other through the first spinneret cylindrical guide hole a2 and the first spinneret conical guide hole a3 in sequence;

[0075] The second spinneret group b has the same structural arrangement as the first spinneret group a, including a second spinneret flow trough b1, a second spinneret cylindrical guide hole b2, a second spinneret conical guide hole b3, and a second spinneret micro-hole b4.

[0076] The distance between the first spinneret flow groove a1 and the second spinneret flow groove b1 is greater than the distance between the first spinneret micropore a4 and the second spinneret micropore b4.

[0077] The first spinneret micropore a4 and the second spinneret micropore b4 are both semi-cross shaped, the two semi-cross shapes are identical and symmetrically arranged, and the sides of the two semi-cross shapes in opposite directions are arranged in an arc shape;

[0078] The PTT and antibacterial PET polymer melts enter the first spinneret flow trough a1 and the second spinneret flow trough b1 respectively, and are ejected through the first spinneret cylindrical guide hole a2, the first spinneret conical guide hole a3, the first spinneret micro-hole a4, and the second spinneret cylindrical guide hole b2, the second spinneret conical guide hole b3, and the second spinneret micro-hole b4 to melt and expand, forming tightly bonded antibacterial polyester fibers outside the holes;

[0079] The vertical lengths of the first spinneret micropore and the second spinneret micropore are L1+L2+L3, and the horizontal lengths are L1+L5. The radius R of the arc is L1=L2 / 2, L2=L3=L4=L5, and the radius R of the arc is 4L2.

[0080] Wherein, the sorbitol content in the antibacterial polyethylene terephthalate polymer is 0.5 to 2 wt%;

[0081] Wherein, the content of the antibacterial agent in the antibacterial polyethylene terephthalate polymer is 1 to 5 wt%;

[0082] Wherein, the stabilizer in the antibacterial polyethylene terephthalate polymer is trimethyl phosphate TMP, and its content is 120-300 ppm;

[0083] Wherein, the titanium dioxide content in the antibacterial polyethylene terephthalate polymer is 0 to 3 wt%;

[0084] The intrinsic viscosity of the poly(trimethylene terephthalate) chips is 1.0 to 1.2 dl / g, and the intrinsic viscosity of the antibacterial polyethylene terephthalate polymer chips is 0.4 to 0.55 dl / g.

[0085] The hydrophilic quick-drying composite elastic antibacterial polyester fiber can be woven alone or interwoven with other yarns to make woven fabrics or knitted fabrics.

[0086] The test methods for the main indicators of hydrophilic quick-drying composite elastic antibacterial polyester fiber are as follows:

[0087] (1) Intrinsic viscosity of polyester chips: tested according to the national standard GB / T 14190-2017, where the solvent is phenol / 1,1,2,2-tetrachloroethane (mass ratio 50:50).

[0088] (2) Fiber strength: tested in accordance with national standard GB / T 8960-2015.

[0089] (3) Fiber curl shrinkage: Tested according to the national standard GB / T 6506-2017 Test method for curling performance of synthetic fiber textured yarn and polyester test conditions.

[0090] (4) Elastic recovery rate: According to the industry standard FZT 70006-2022 Test method for elastic recovery rate of knitted fabrics, the fiber is made into knitted fabric pieces and tested.

[0091] (5) Moisture absorption and quick-drying properties: including four indicators such as water absorption rate, drip diffusion time, drying rate and wicking height. The test is carried out on knitted fabrics according to the national standard GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles Part 1: Single combination test method".

[0092] (6) Antibacterial property: According to the national standard GB / T20944.3-2008 “Evaluation of antibacterial properties of textiles Part 3 Oscillation method”, Staphylococcus aureus ATCC6538, Escherichia coli ATCC29522 and Candida albicans ATCC10231 were selected to test the antibacterial rate of the samples after 50 washes.

[0093] Table 1 below lists the raw material ratios, reaction conditions and test results of 6 different examples and 2 comparative examples:

[0094] Table 1 Preparation conditions and properties of hydrophilic quick-drying composite elastic antibacterial polyester fiber

[0095]

[0096] As shown in the table, the hydrophilic, quick-drying, antibacterial composite elastic polyester fibers prepared using the method of the present invention in Examples 1-6 exhibit excellent elasticity, moisture absorption and quick-drying properties (all reaching Class III), and antibacterial properties. However, when the antibacterial PET used in Comparative Example 1 does not contain sorbitol, and other conditions remain the same as in Example 4, the moisture absorption and quick-drying properties of the fibers produced are significantly reduced. The conventional PTT / PET parallel composite elastic fiber in Comparative Example 2 exhibits poor moisture absorption and quick-drying properties and lacks antibacterial properties.

[0097] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0099] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0100] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0101] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber, characterized by: The preparation method comprises the following steps: (1) Preparation of antibacterial polyethylene terephthalate polymer: Ethylene glycol and purified terephthalic acid are added to a beating kettle respectively, with the acid / alcohol molar ratio being 1:1.25-1.55, and then sorbitol, antibacterial agent, stabilizer, catalyst and titanium dioxide additive are added respectively to form a uniform slurry, which is pumped into an esterification kettle for esterification reaction. The esterification reaction is carried out at normal pressure to 0.01 MPa, and the esterification temperature is controlled between 245 and 255°C; the reaction endpoint is determined based on the time when the amount of esterification water distilled reaches the calculated value, and the amount of esterification water distilled is calculated by the following formula: Esterification water amount = total molar number of acid components in the reaction system × 36 × 98%, and the unit of esterification water amount is kg; After the esterification reaction, a polycondensation reaction is carried out, which is divided into a low vacuum stage and a high vacuum stage. In the low vacuum stage, the pressure is steadily pumped from atmospheric pressure to an absolute pressure of less than 1 kPa, and the temperature is controlled between 255 and 270°C. In the high vacuum stage, the vacuum is continued to be pumped to an absolute pressure of less than 50 Pa, the reaction temperature is controlled between 270 and 287°C, and the terminal discharge temperature is strictly controlled at 285 to 287°C. The polymer is discharged when it reaches the target viscosity value, and then underwater pelletized and dried to obtain antibacterial polyethylene terephthalate polymer chips. The preparation process steps of the antibacterial agent are as follows: Deionized water, accounting for 97% of the total mass, is added to a reaction vessel, and at least one of sodium 5-sulfoterephthalate and 1-octa-, deca-, dodeca-, tetradeca-, hexadeca-, or octadecyl-3-methylimidazole bromide is added at a molar ratio of 1.05:

1. The mixture is stirred and reacted for 2.5 hours at room temperature and pressure. The mixture is centrifuged to remove water, and the collected white solid powder is washed with deionized water for more than three times. Finally, the mixture is vacuum-dried to obtain a white powdery antibacterial agent. (2) Spinning: Polypropylene terephthalate chips and antibacterial polyethylene terephthalate polymer chips are taken separately, dried until the moisture content reaches below 30ppm, and then enter their respective single-screw extruders for melt extrusion. The melt passes through a filter and a metering pump and enters a composite spinning assembly. The melt is merged at the outlet of the spinneret to form a parallel composite spinning polyester fiber with a cross-shaped cross-section. The polyester fiber is cooled, oiled, stretched, shaped, and processed into fully stretched yarn FDY or polyester low-elastic yarn DTY.

2. The method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 1, characterized in that: In step (2), the surface of the spinneret (1) is provided with a plurality of first spinneret hole groups (a) and second spinneret hole groups (b); A plurality of first spinneret hole groups (a) and a plurality of second spinneret hole groups (b) are arranged at equal intervals along the circumferential direction of the spinneret plate (1); The first spinneret hole group (a) forms an arrangement located in an outer ring on the surface of the spinneret plate (1), and the second spinneret hole group (b) forms an arrangement located in an inner ring on the surface of the spinneret plate (1); The first spinneret hole group (a) and the second spinneret hole group (b) are set to have the same number and hole diameter, and the first spinneret hole group (a) and the second spinneret hole group (b) are set correspondingly; The first spinneret group (a) is provided with a first spinneret flow trough (a1), a first spinneret cylindrical guide hole (a2), a first spinneret conical guide hole (a3), and a first spinneret micro-hole (a4); The first spinneret flow trough (a1) is arranged on the top surface of the spinneret (1), and the first spinneret micropore (a4) is arranged on the bottom surface of the spinneret (1); The first spinneret flow trough (a1) and the first spinneret micropore (a4) are connected and communicated with each other through the first spinneret cylindrical guide hole (a2) and the first spinneret conical guide hole (a3) ​​in sequence; The second spinneret group (b) has the same structural arrangement as the first spinneret group (a), including a second spinneret flow trough (b1), a second spinneret cylindrical guide hole (b2), a second spinneret conical guide hole (b3) and a second spinneret micro-hole (b4). wherein the distance between the first spinneret flow trough (a1) and the second spinneret flow trough (b1) is greater than the distance between the first spinneret micropore (a4) and the second spinneret micropore (b4); The first spinneret micropore (a4) and the second spinneret micropore (b4) are both semi-cross shaped, the two semi-cross shapes are identical and symmetrically arranged, and the side surfaces of the two semi-cross shapes in opposite directions are arranged in an arc shape.

3. The method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 1, characterized in that: The sorbitol content in the antibacterial polyethylene terephthalate polymer is 0.5-2 wt %.

4. The method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 1, characterized in that: The content of the antibacterial agent in the antibacterial polyethylene terephthalate polymer is 1 to 5 wt %.

5. The method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 1, characterized in that: The stabilizer in the antibacterial polyethylene terephthalate polymer is trimethyl phosphate TMP, and its content is 120-300 ppm.

6. The method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 1, characterized in that: The catalyst in the antibacterial polyethylene terephthalate polymer is ethylene glycol antimony, and its content is 300-550 ppm.

7. The method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 1, characterized in that: The titanium dioxide content in the antibacterial polyethylene terephthalate polymer is 0-3 wt %.

8. The method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 1, characterized in that: The intrinsic viscosity of the poly(trimethylene terephthalate) chips is 1.0-1.2 dl / g, and the intrinsic viscosity of the antibacterial polyethylene terephthalate polymer chips is 0.4-0.55 dl / g.

9. A hydrophilic quick-drying composite elastic antibacterial polyester fiber prepared by the method for preparing a hydrophilic quick-drying composite elastic antibacterial polyester fiber according to any one of claims 1 to 8, characterized in that: The fiber has a cross-shaped cross-section structure and is prepared by parallel composite spinning of poly(trimethylene terephthalate) chips and antibacterial polyethylene terephthalate polymer in a weight ratio of 40:60 to 60:

40.

10. The hydrophilic quick-drying composite elastic antibacterial polyester fiber according to claim 9, characterized in that: The antimicrobial polyethylene terephthalate polymer contains an antimicrobial agent selected from the group consisting of: ； [C8][STPA] [C10][STPA] [C12][STPA] ； [C14][STPA] [C16][STPA] [C18][STPA] At least one of .

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