Moisture-absorbing quick-drying spandex-free elastic knitted fabric and preparation method thereof

Abstract

The present invention relates to the technical field of chemical fibers and textiles, and more specifically to a moisture-absorbing, quick-drying, spandex-free elastic knitted fabric and a preparation method thereof. The fabric is woven from polyester fibers and polyester filaments, wherein the polyester fibers account for 50% to 70% of the total fabric mass and the polyester filaments account for 30% to 50% of the total fabric mass. The polyester fibers are hydrophilic, quick-drying, composite, elastic, and antibacterial polyester fibers obtained by composite spinning of PTT and antibacterial PET. The polyester filaments are high-shrinkage, antibacterial polyester filaments with a cross-section. The high-shrinkage, antibacterial polyester filaments of the present invention utilize a special high-molecular polymer that is heat-resistant and has excellent antibacterial properties. An isophthalic acid modifier helps reduce crystallinity and improve shrinkage without affecting spinning performance. The two modified fibers are rationally interwoven to leverage their respective advantages to produce a moisture-absorbing, quick-drying, spandex-free elastic knitted fabric. The fibers are copolymerized and modified to reduce stiffness, resulting in cotton-like properties without the need for spandex addition. After treatment, the fabric exhibits a variety of excellent properties.

Description

Technical Field

[0001] The invention relates to the technical field of chemical fibers and textiles, and more particularly to a moisture-absorbing and quick-drying spandex-free elastic knitted fabric and a preparation method thereof. Background Art

[0002] Knitted fabrics, due to their excellent elasticity and adaptability, are widely used in underwear, sportswear, and casual wear. In these applications, the fabrics must not only possess basic elasticity but also possess certain moisture-wicking properties to meet human comfort needs. As people's living standards continue to improve, their demands for mid- to high-end brand clothing are becoming increasingly stringent. Consumers are beginning to seek knitted fabrics that are spandex-free, exhibit excellent four-way elasticity, absorb moisture quickly, and have long-lasting, healthy, antibacterial and deodorizing properties.

[0003] Spandex, the main elastic fiber material for elastic knitted fabrics, has advantages such as high elasticity, good hand feel, and resistance to deformation. However, its moisture absorption is poor, making it difficult to dry automatically once wet, and it needs to be coated with other fibers, which is costly. In addition, spandex has poor heat resistance, making it non-breathable in summer and prone to sweating. It also has poor dyeability and is not chlorine-resistant. The fiber's abrasion resistance is also inferior to that of most main fibers. After long-term use, especially in underwear and other close-fitting clothing, it is prone to breakage, loss of elasticity, and whitening.

[0004] Compared to cotton, polyester has high strength and good shape retention, but its hydrophobic nature results in poor moisture absorption, and it is not as soft and comfortable to wear as cotton. Although patents (such as CN114808251B) provide a cotton-like elastic knitted fabric and its preparation method, which is woven from cotton-like composite yarn, cotton yarn, and polyester yarn to achieve a certain degree of cotton-like effect, this fabric is relatively complex in weaving and dyeing and finishing processes, which increases costs. It also has only moderate moisture absorption and quick-drying properties, and its elasticity is reduced due to the influence of cotton yarn. More importantly, this fabric does not have antibacterial properties.

[0005] Currently, the antibacterial properties of elastic knitted fabrics are mainly achieved through impregnation finishing, and the antibacterial agents used are mostly metallic inorganic substances containing silver ions, sodium silver, zinc oxide, etc. This method has the disadvantages that the fabric is not washable, easily loses its antibacterial properties, and the shed antibacterial agent may affect human health. Although a small number of methods use masterbatch polyester raw material blending to add antibacterial agents to fibers to solve the problem of short-term and easy shedding, this method affects spinning performance, reduces spinning and filtration cycles, and increases costs.

[0006] In summary, existing elastic knitted fabrics have many shortcomings in terms of hygroscopicity, elasticity, antibacterial properties, etc., and some improvement methods have brought new problems such as complex processes and increased costs, which urgently need further research and development and improvement. Summary of the Invention

[0007] The purpose of the present invention is to solve the above technical problems and provide a moisture-absorbing and quick-drying spandex-free elastic knitted fabric and a preparation method thereof.

[0008] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0009] The present invention provides a moisture-absorbing and quick-drying spandex-free elastic knitted fabric, which is woven from polyester fibers and polyester filaments, wherein the polyester fibers account for 50% to 70% of the total fabric and the polyester filaments account for 30% to 50% of the total fabric;

[0010] The polyester fiber is a hydrophilic, quick-drying, composite elastic, antibacterial polyester fiber made by composite spinning of PTT and antibacterial PET;

[0011] The polyester filament is a high-shrinkage antibacterial polyester filament with a cross-section;

[0012] The fabric is knitted in 12 loops as a cycle, wherein the 1st to 5th loops are tucking; the 6th loop is looping, floating line, floating line, and tucking in sequence; the 7th to 11th loops are tucking; the 12th loop is floating line, tucking, looping, and floating line in sequence; the 1st to 5th loops and the 7th to 11th loops are full needle out; the 6th and 12th loops are half needle out; the 1st to 5th loops and the 7th to 11th loops of the fabric use hydrophilic quick-drying composite elastic antibacterial polyester fiber, and the 6th and 12th loops use high-shrinkage antibacterial polyester filament.

[0013] As a preferred technical solution of the present invention, the hydrophilic quick-drying composite elastic antibacterial polyester fiber is a composite elastic DTY filament processed from PTT and antibacterial PET, wherein the antibacterial PET is prepared by in-situ polymerization modification using an organic antibacterial agent and a sorbitol hydrophilic modifier, and the fiber cross-section is a cross-shaped fiber.

[0014] As a preferred technical solution of the present invention, the specific preparation method of the high-shrinkage antibacterial polyester filament is as follows: first, a slurry is configured in a beating kettle, and the slurry is isophthalic acid, terephthalic acid and ethylene glycol. Then, an antibacterial agent and an auxiliary agent are respectively added to the beating kettle to form a uniform slurry, and then the slurry is pumped into an esterification kettle for esterification reaction and then polycondensation reaction. When the polymer reaches the target viscosity value, the material is discharged and underwater pelletized to obtain high-shrinkage antibacterial PET chips. The high-shrinkage antibacterial PET chips are then dried until the moisture content reaches below 30 ppm, enter a screw extruder, and melt-extrude. The melt passes through a filter and a metering pump and enters a spinning assembly. Finally, fibers are formed. The fibers are cooled, oiled, hot-stretched, and wound into high-shrinkage antibacterial FDY yarns, which are high-shrinkage antibacterial polyester filaments.

[0015] The acid / alcohol molar ratio of isophthalic acid, terephthalic acid and ethylene glycol is 1:1.15;

[0016] The isophthalic acid accounts for 6 to 12 wt% of the terephthalic acid;

[0017] The antibacterial dosage accounts for 2 to 6 wt % of terephthalic acid;

[0018] The fiber cross section of the high shrinkage antibacterial polyester filament is cross-shaped.

[0019] As a preferred technical solution of the present invention, the antibacterial agent is 1-benzyl-3-methylimidazole sulfonate of phthalic acid-5, which is obtained by ion exchange reaction between 1-benzyl-3-methylimidazole bromide and sodium isophthalic acid-2-sulfonate. The molecular structure of the antibacterial agent is: .

[0020] As a preferred technical solution of the present invention, the specific preparation steps of the antibacterial agent are as follows:

[0021] First, deionized water accounting for 95% of the total mass and the remaining amounts of sodium 5-sulfoisophthalate and 1-benzyl-3-methylimidazole bromide are added to the reaction container, and the molar ratio of sodium 5-sulfoisophthalate and 1-benzyl-3-methylimidazole bromide is 1.02:1. The mixture is stirred and reacted for 2 hours at room temperature and pressure, and then centrifuged and filtered to remove water. The collected white solid powder is then washed with deionized water for at least three times, and finally vacuum dried to obtain a white powdery antibacterial agent.

[0022] As a preferred technical solution of the present invention, the auxiliary agents are catalysts and titanium dioxide.

[0023] The present invention also provides a method for preparing a moisture-absorbing and quick-drying spandex-free elastic knitted fabric, comprising the following steps:

[0024] I) Fabric weaving: using a circular knitting machine to weave the polyester fiber and polyester filament as described in any one of the claims above to produce a grey fabric, and then inspecting and sewing the woven grey fabric;

[0025] II) Shrinkage: Shrink the grey fabric. Shrinkage is done in the dyeing equipment at a temperature of 115°C.

[0026] III) Dyeing: After shrinking, dyeing can be carried out directly in the original shrinking overflow cylinder without removing the cylinder from the shrinking cylinder. Add dyeing auxiliaries at room temperature, with a dye concentration of 1-15% owf, a dispersant of 2-8 g / L, a leveling agent of 1-4 g / L, and a penetrant of 0.5-3 g / L. At this time, heat the cylinder to 105-110°C at a rate of 2°C / min until dyeing is completed.

[0027] IV) Fixation: After dyeing, cool down the original vat, drain the liquid, add hydrosulfite and soda ash, and perform reduction water washing;

[0028] V) Shaping: The padding and tentering method is used for shaping, the temperature is controlled at 160-180° C., and the time is 30-60 seconds to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

[0029] As a preferred technical solution of the present invention, refining agent and liquid alkali are further added in the pre-shrinkage step.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The high shrinkage antibacterial polyester yarn of the present invention uses a polymer with three ring structures, and the terminal carboxyl group of the meta-benzene ring participates in the copolymerization reaction to form a high molecular polymer that not only has high temperature resistance but also has good antibacterial properties. The antibacterial agent is firmly bonded and combined with the isophthalic acid modifier, it synergistically helps to reduce the crystallinity of the polymer and improve the shrinkage, and has basically no effect on the spinning performance.

[0032] 2. The present invention reasonably interweaves two modified fibers, gives full play to the elastic properties of hydrophilic quick-drying composite elastic antibacterial polyester fiber and the good shrinkage of high-shrinkage antibacterial polyester yarn, and combines the knitting structure characteristics to prepare a moisture-absorbing quick-drying spandex-free elastic knitted fabric with a four-way stretch effect.

[0033] 3. The moisture-absorbing and quick-drying spandex-free elastic knitted fabric of the present invention is interwoven with two fiber materials both having quick-drying and antibacterial properties. Both fibers are copolymerized and modified, which greatly reduces the stiffness of polyester and has hydrophilicity and softness similar to cotton. In addition, the two fibers have high elasticity and certain shrinkage respectively, and no spandex needs to be added. The knitted fabric after dyeing, finishing and heat setting has good moisture absorption and quick drying, high elasticity, antibacterial properties, bulkiness, wrinkle resistance, dimensional stability and easy dyeing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a triangular arrangement diagram of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric of the present invention;

[0035] Figure 2 This is a diagram of the knitting method of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric of the present invention. DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] PTT (Polytrimethylene Terephthalate), also known as polytrimethylene terephthalate, is a thermoplastic polyester material.

[0038] PET, the full name of Polyethylene Terephthalate, is a thermoplastic polyester material.

[0039] In all the following examples, the antibacterial agent used is 1-benzyl-3-methylimidazole sulfonate of phthalic acid-5, which is obtained by ion exchange reaction between 1-benzyl-3-methylimidazole bromide and sodium 2-sulfoisophthalic acid. The molecular structure of the antibacterial agent is: ; Its specific preparation steps are as follows:

[0040] First, deionized water accounting for 95% of the total mass and the remaining amounts of sodium 5-sulfoisophthalate and 1-benzyl-3-methylimidazole bromide are added to the reaction container, and the molar ratio of sodium 5-sulfoisophthalate and 1-benzyl-3-methylimidazole bromide is 1.02:1. The mixture is stirred and reacted for 2 hours at room temperature and pressure, and then centrifuged and filtered to remove water. The collected white solid powder is then washed with deionized water for at least three times, and finally vacuum dried to obtain a white powdery antibacterial agent.

[0041] In all the following embodiments, the test methods for the main indicators of the moisture-absorbing and quick-drying non-spandex elastic knitted fabric are as follows:

[0042] (1) 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.

[0043] (2) 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".

[0044] (3) 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.

[0045] Example 1:

[0046] The fabric is made of hydrophilic quick-drying composite elastic antibacterial polyester fiber, which accounts for 70% of the total fabric mass, and high-shrinkage antibacterial polyester filament, which accounts for 30% of the total fabric mass.

[0047] The preparation method of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric comprises the following steps:

[0048] I) Fabric weaving: Use a large circular knitting machine to weave hydrophilic quick-drying composite elastic antibacterial polyester fiber and high shrinkage antibacterial polyester filament to weave the grey cloth. Then, the woven grey cloth is inspected and the ends are sewn. The weaving method is ( Figure 1 、 2 As shown): 12 routes are a cycle, wherein routes 1 to 5 are tucking; route 6 is looping, floating line, floating line, and tucking in sequence; routes 7 to 11 are tucking; route 12 is floating line, tucking, looping, and floating line in sequence; routes 1 to 5 and routes 7 to 11 are full needle out; routes 6 and 12 are half needle out, and routes 1 to 5 and routes 7 to 11 of the fabric are made of hydrophilic quick-drying composite elastic antibacterial polyester fiber, and routes 6 and 12 are made of high-shrinkage antibacterial polyester filament;

[0049] The hydrophilic quick-drying composite elastic antibacterial polyester fiber is a composite elastic DTY filament made of PTT and antibacterial PET, wherein the antibacterial PET is prepared by in-situ polymerization modification using an organic antibacterial agent and a sorbitol hydrophilic modifier, and the fiber cross-section is a cross-shaped fiber. The specific preparation method thereof is referred to Chinese patent CN2024105534155;

[0050] The specific preparation method of the high-shrinkage antibacterial polyester filament is as follows: first, a slurry is configured in a beating kettle, wherein the slurry comprises isophthalic acid, terephthalic acid and ethylene glycol; then, an antibacterial agent and an auxiliary agent (catalyst and titanium dioxide, etc.) are respectively added to the beating kettle to form a uniform slurry; then, the slurry is pumped into an esterification kettle for esterification reaction and then polycondensation reaction; when the polymer reaches a target viscosity value, the material is discharged and underwater pelletized to obtain high-shrinkage antibacterial PET chips; then, the high-shrinkage antibacterial PET chips are dried until the moisture content reaches below 30 ppm, and then enter a screw extruder for melt extrusion. The melt passes through a filter and a metering pump and enters a spinning assembly; finally, fibers are formed, and the fibers are cooled, oiled, hot-stretched, and wound into high-shrinkage antibacterial FDY yarn, i.e., high-shrinkage antibacterial polyester filament; the amount of the catalyst and titanium dioxide added, as well as the reaction conditions for esterification and polycondensation are the same as those for preparing conventional semi-matt PET chips;

[0051] The acid / alcohol molar ratio of isophthalic acid, terephthalic acid and ethylene glycol is 1:1.15;

[0052] The isophthalic acid accounts for 6 wt % of the terephthalic acid;

[0053] The antimicrobial dosage accounts for 6 wt % of terephthalic acid;

[0054] The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped;

[0055] II) Shrinkage: Shrink the grey fabric. Shrinkage is done in the dyeing equipment at a temperature of 115°C. During shrinkage, a scouring agent may be added to remove impurities from the fabric. A suitable amount of liquid alkali may also be added.

[0056] III) Dyeing: After shrinking, dyeing can be carried out directly in the original shrinking overflow cylinder without removing the cylinder from the shrinking cylinder. Add dyeing auxiliaries at room temperature, with a dye concentration of 15% owf, a dispersant of 8 g / L, a leveling agent of 4 g / L, and a penetrant of 3 g / L. At this time, heat the cylinder to 105-110°C at a rate of 2°C / min until dyeing is completed.

[0057] IV) Color Fixation: After dyeing, the original vat is cooled, the liquid is drained, and hydrosulfite and soda ash are added, followed by reduction washing to ensure the fabric's feel and color fastness;

[0058] V) Shaping: The padding and stentering method is used for shaping, the temperature is controlled at 160° C., and the time is 60 seconds to produce the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

[0059] Example 2:

[0060] The material is made of hydrophilic quick-drying composite elastic antibacterial polyester fiber, which accounts for 60% of the total fabric weight, and high-shrinkage antibacterial polyester filament, which accounts for 40% of the total fabric weight.

[0061] 1) Fabric weaving: same as in Example 1;

[0062] wherein the isophthalic acid accounts for 8 wt % of the terephthalic acid;

[0063] The antimicrobial dosage accounts for 4 wt % of terephthalic acid;

[0064] The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped;

[0065] II) Pre-shrinkage process: same as in Example 1;

[0066] III) Dyeing: After shrinking, dyeing is carried out directly in the original shrinking overflow cylinder without removing the material from the cylinder. Dyeing auxiliaries are added at room temperature, with a dye concentration of 8% owf, a dispersant of 6 g / L, a leveling agent of 3 g / L, and a penetrant of 1.5 g / L. At this point, the temperature is raised to 105-110°C at a rate of 2°C / min until dyeing is complete.

[0067] IV) Fixation: Same as Example 1;

[0068] V) Shaping: The padding and tentering method is used for shaping, the temperature is controlled at 180° C., and the time is 30 seconds to produce the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

[0069] Example 3:

[0070] The material is made of hydrophilic quick-drying composite elastic antibacterial polyester fiber, which accounts for 50% of the total fabric mass, and high shrinkage antibacterial polyester filament, which accounts for 50% of the total fabric mass;

[0071] 1) Fabric weaving: same as in Example 1;

[0072] wherein the isophthalic acid accounts for 12 wt % of the terephthalic acid;

[0073] The antimicrobial dosage accounts for 2 wt % of terephthalic acid;

[0074] The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped;

[0075] II) Pre-shrinkage process: same as in Example 1;

[0076] III) Dyeing: After shrinking, dyeing is carried out directly in the original shrinking overflow cylinder without removing the material from the cylinder. Add dyeing auxiliaries at room temperature, with a dye concentration of 1% owf, a dispersant of 2 g / L, a leveling agent of 1 g / L, and a penetrant of 0.5 g / L. At this time, heat the cylinder to 105-110°C at a rate of 2°C / min until dyeing is complete.

[0077] IV) Fixation: Same as Example 1;

[0078] V) Shaping: The padding and tentering method is used for shaping, the temperature is controlled at 170° C., and the time is 50 seconds to produce the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

[0079] Example 4:

[0080] The fabric is made of hydrophilic quick-drying composite elastic antibacterial polyester fiber, which accounts for 65% of the total fabric weight, and high-shrinkage antibacterial polyester filament, which accounts for 35% of the total fabric weight.

[0081] 1) Fabric weaving: same as in Example 1;

[0082] wherein the isophthalic acid accounts for 10 wt% of the terephthalic acid;

[0083] The antimicrobial dosage accounts for 3wt% of terephthalic acid;

[0084] The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped;

[0085] II) Pre-shrinkage process: same as in Example 1;

[0086] III) Dyeing: After shrinking, dyeing is carried out directly in the original shrinking overflow cylinder without removing the material from the cylinder. Dyeing auxiliaries are added at room temperature, with a dye concentration of 5% owf, a dispersant of 3 g / L, a leveling agent of 2 g / L, and a penetrant of 1.2 g / L. At this point, the temperature is raised to 105-110°C at a rate of 2°C / min until dyeing is complete.

[0087] IV) Fixation: Same as Example 1;

[0088] V) Shaping: The padding and tentering method is used for shaping, the temperature is controlled at 170° C., and the time is 50 seconds to produce the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

[0089] Comparative Example 1: No antibacterial agent was added to the high shrinkage polyester filament used in the knitted fabric, and the other schemes and processes were the same as those in Example 4;

[0090] Comparative Example 2 The fiber cross-section of the high shrinkage antibacterial polyester filament used in the knitted fabric is circular, and other schemes and processes are the same as those in Example 4;

[0091] Table 1 Test results of moisture-absorbing and quick-drying non-spandex elastic knitted fabrics

[0092]

[0093] As can be seen from Table 1, the moisture-absorbing and quick-drying spandex-free elastic knitted fabrics prepared by the method of the present invention in Examples 1-4 have good elasticity, moisture-absorbing and quick-drying (all reaching Level III) and antibacterial properties, while the antibacterial properties of Comparative Example 1 are significantly reduced compared with Example 4 because the high-shrinkage fiber does not contain an antibacterial agent. The cross-section of the high-shrinkage fiber in Comparative Example 2 is circular, and the moisture-absorbing and quick-drying properties are much worse than those of Example 4.

[0094] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be included within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0095] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A moisture-absorbing, quick-drying, spandex-free elastic knitted fabric woven from polyester fibers and polyester filaments, characterized by: Polyester fiber accounts for 50% to 70% of the total fabric, and polyester filament accounts for 30% to 50% of the total fabric; The polyester fiber is a hydrophilic, quick-drying, composite elastic, antibacterial polyester fiber made by composite spinning of PTT and antibacterial PET; The polyester filament is a high-shrinkage antibacterial polyester filament with a cross-section; The specific preparation method of the high-shrinkage antibacterial polyester filament is as follows: first, a slurry is configured in a beating kettle, wherein the slurry is isophthalic acid, terephthalic acid and ethylene glycol; then, an antibacterial agent and an auxiliary agent are respectively added to the beating kettle to form a uniform slurry; then, the slurry is pumped into an esterification kettle for esterification reaction and then polycondensation reaction; when the polymer reaches a target viscosity value, the material is discharged, underwater pelletization is performed to obtain high-shrinkage antibacterial PET chips; then, the high-shrinkage antibacterial PET chips are dried until the moisture content reaches below 30 ppm, and then enter a screw extruder for melt extrusion. The melt passes through a filter and a metering pump and enters a spinning assembly. Finally, fibers are formed, and the fibers are cooled, oiled, hot-stretched, and wound into high-shrinkage antibacterial FDY yarns, i.e., high-shrinkage antibacterial polyester filaments; The acid / alcohol molar ratio of isophthalic acid, terephthalic acid and ethylene glycol is 1:1.15; The isophthalic acid accounts for 6 to 12 wt% of the terephthalic acid; The antibacterial dosage accounts for 2 to 6 wt % of terephthalic acid; The antibacterial agent is 1-benzyl-3-methylimidazole 5-sulfonate phthalate, which is obtained by ion exchange reaction between 1-benzyl-3-methylimidazole bromide and sodium 2-sulfonate isophthalic acid. The molecular structure of the antibacterial agent is: 。 2. The moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to claim 1, characterized in that: The hydrophilic quick-drying composite elastic antibacterial polyester fiber is a composite elastic DTY filament made from PTT and antibacterial PET, wherein the antibacterial PET is prepared by in-situ polymerization modification using an organic antibacterial agent and a sorbitol hydrophilic modifier, and the fiber cross section is a cross-shaped fiber.

3. The moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to claim 1, characterized in that: The fabric is knitted in 12 loops as a cycle, wherein the 1st to 5th loops are tucking; the 6th loop is looping, floating line, floating line, and tucking in sequence; the 7th to 11th loops are tucking; the 12th loop is floating line, tucking, looping, and floating line in sequence; the 1st to 5th loops and the 7th to 11th loops are full needle out; the 6th and 12th loops are half needle out; the 1st to 5th loops and the 7th to 11th loops of the fabric use hydrophilic quick-drying composite elastic antibacterial polyester fiber, and the 6th and 12th loops use high-shrinkage antibacterial polyester filament.

4. The moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to claim 1, characterized in that: The specific preparation steps of the antibacterial agent are as follows: First, deionized water accounting for 95% of the total mass and the remaining amounts of sodium 5-sulfoisophthalate and 1-benzyl-3-methylimidazole bromide are added to the reaction container, and the molar ratio of sodium 5-sulfoisophthalate and 1-benzyl-3-methylimidazole bromide is 1.02:

1. The mixture is stirred and reacted for 2 hours at room temperature and pressure, and then centrifuged and filtered to remove water. The collected white solid powder is then washed with deionized water for at least three times, and finally vacuum dried to obtain a white powdery antibacterial agent.

5. The moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to claim 1, characterized in that: The auxiliary agents are catalyst and titanium dioxide.

6. A method for preparing the moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to any one of claims 1 to 5, characterized in that: The following steps are involved: I) Fabric weaving: using a circular knitting machine to weave the polyester fiber and polyester filament according to any one of claims 1 to 5 to produce a grey fabric, and then inspecting and sewing the woven grey fabric; Ⅱ) Shrinkage: Shrink the grey fabric in the dyeing equipment at a temperature of 115°C. III) Dyeing: After shrinking, dyeing can be carried out directly in the original shrinking overflow cylinder without taking the cylinder out of the cylinder. Add dyeing auxiliaries at room temperature, with a dye concentration of 1-15% owf, a dispersant of 2-8 g / L, a leveling agent of 1-4 g / L, and a penetrant of 0.5-3 g / L. At this time, heat the cylinder to 105-110°C at a rate of 2°C / min until dyeing is completed. IV) Fixation: After dyeing is completed, the original vat is cooled, the liquid is drained, and sodium hyposulfite and soda ash are added, and the dye is washed with reduced water; V) Shaping: The padding and tentering method is used for shaping, the temperature is controlled at 160-180° C., and the time is 30-60 seconds, so as to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

7. The method for preparing a moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to claim 6, characterized in that: Refining agents and liquid alkali are also added during the pre-shrinking process.

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