Moisture-absorption quick-dry spandex-free elastic knitted fabric and preparation method thereof

Abstract

The invention relates to the technical field of chemical fibers and textiles, in particular to a moisture-absorption quick-dry spandex-free elastic knitted fabric and a preparation method thereof.The fabric is formed by weaving polyester fibers and polyester filament yarns, the mass of the polyester fibers accounts for 50%-70% of the total fabric, and the mass of the polyester filament yarns accounts for 30%-50% of the total fabric; the polyester fibers are hydrophilic quick-dry composite elastic antibacterial polyester fibers formed by carrying out composite spinning processing on PTT (Polytrimethylene Terephthalate) and antibacterial PET (Polyethylene Terephthalate); and the polyester filament yarns are high-shrinkage antibacterial polyester filament yarns with cross sections and the like. The high-shrinkage antibacterial polyester yarn adopts a special high-molecular polymer and has the advantages of high temperature resistance and good antibacterial property, the isophthalic acid modifier assists in reducing the crystallinity and improving the contractibility, the spinning performance is not influenced, the two modified fibers are reasonably interwoven and exert respective advantages, the prepared moisture-absorbing quick-drying spandex-free elastic knitted fabric has the advantages that the fibers are subjected to copolymerization modification, and the moisture-absorbing quick-drying spandex-free elastic knitted fabric has good moisture-absorbing and quick-drying effects. And the fabric has a cotton-like characteristic, does not need to be added with spandex, and has various excellent properties after being treated.

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 are widely used in underwear, sportswear, casual wear and other fields due to their good elasticity and adaptability. In these application scenarios, the fabrics not only need to have basic elasticity, but also require certain moisture absorption and perspiration wicking functions to meet the needs of human comfort. With the continuous improvement of people's living standards, the requirements for mid-to-high-end brand clothing are becoming increasingly stringent. Consumers are beginning to pursue knitted fabrics that do not contain spandex, have good four-sided elasticity, moisture absorption and quick drying, and long-lasting, healthy, antibacterial and deodorizing functions. As the main elastic fiber material of elastic knitted fabrics, spandex has the advantages of high elasticity, good hand feel, and not easy to deform, but its hygroscopicity is poor. Once wet, it is difficult to dry automatically, and it needs to be covered with other fibers for use, which is costly. In addition, spandex has poor heat resistance, is not breathable in summer, and easily causes skin sweating. It has poor dyeability and is not chlorine-resistant. The fiber wear resistance is not as good as most main fibers. After long-term use, especially underwear and other close-fitting clothing, it is easy to break, lose elasticity, and leak white. Compared with cotton, polyester has high strength and good shape retention, but its hydrophobic properties lead to poor moisture absorption, and it is not as soft and comfortable to wear as cotton. Although there is a patent (such as CN114808251B) that provides a cotton-like elastic knitted fabric and a preparation method thereof, which is woven with cotton-like composite silk, cotton yarn and polyester yarn to achieve a cotton-like effect to a certain extent, this fabric is relatively complicated in weaving and dyeing and finishing processes, the cost is increased, and the moisture absorption and quick-drying function is general, and the elasticity is affected by the cotton yarn and reduced; more importantly, the fabric does not have antibacterial properties; At present, the antibacterial property of elastic knitted fabrics is mainly achieved through the impregnation finishing method, and the antibacterial agents used are mostly metal inorganic substances containing silver ions, sodium silver, zinc oxide, etc.; this method has the disadvantages that the fabric is not resistant to washing, easily loses its antibacterial property, and the shed antibacterial agent may have an impact on human health; although a small number of them use the masterbatch form of polyester raw material blending method to add antibacterial agents to the fiber to solve the problem of not lasting and easy to fall off, this method will affect the spinning performance, reduce the spinning filtration cycle, and increase the cost; 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 process and rising costs, which urgently need further research and development and improvement. Summary of the invention

[0003] 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.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: The 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; 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 fabric is knitted with 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, and the 1st to 5th loops and the 7th to 11th loops of the fabric use hydrophilic quick-drying composite elastic antibacterial polyester fibers, and the 6th and 12th loops use high-shrinkage antibacterial polyester filaments.

[0005] 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 with an organic antibacterial agent and a sorbitol hydrophilic modifier, and the fiber cross section is a cross-shaped fiber.

[0006] 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, phthalic 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 pelletization is performed to obtain high shrinkage antibacterial PET slices. The high shrinkage antibacterial PET slices are then dried until the moisture content reaches less than 30ppm, enter a screw extruder, and melt extrude. The melt enters a spinning assembly after passing through a filter and a metering pump. 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, phthalic acid and ethylene glycol is 1:1.15; The isophthalic acid accounts for 6 to 12 wt% of the terephthalic acid; The antibacterial dosage is 2-6wt% of terephthalic acid; The fiber cross section of the high shrinkage antibacterial polyester filament is cross-shaped.

[0007] As a preferred technical solution of the present invention, the antibacterial agent is 1-benzyl-3-methylimidazole sulfonate of 5-phthalic acid, and the antibacterial agent is obtained by ion exchange reaction between 1-benzyl-3-methylimidazole bromide and sodium 2-sulfonate of isophthalic acid, and the molecular structure of the antibacterial agent is: .

[0008] As a preferred technical solution of the present invention, the specific preparation steps of the antibacterial agent are as follows: First, deionized water accounting for 95% of the total mass, and the remaining amount of sodium 5-sulfoisophthalic acid and 1-benzyl-3-methylimidazole bromide are added to the reaction container, and the molar ratio of sodium 5-sulfoisophthalic acid and 1-benzyl-3-methylimidazole bromide is 1.02:1. At room temperature and pressure, stirring is carried out to fully react for 2 hours, centrifugal filtration is performed to remove water, and then the collected white solid powder is fully washed with deionized water for at least three times, and finally vacuum dried to obtain a white powdery antibacterial agent.

[0009] As a preferred technical solution of the present invention, the auxiliary agents are catalysts and titanium dioxide.

[0010] The present invention also provides a method for preparing a moisture-absorbing and quick-drying spandex-free elastic knitted fabric, comprising the following steps: Ⅰ) Fabric weaving: using a large circular knitting machine to weave the polyester fiber and polyester filament as described in any one of the above claims, and then weaving the grey cloth, and then inspecting the woven grey cloth and sewing the ends; Ⅱ) Pre-shrinkage: The grey cloth is pre-shrinked in the dyeing equipment at a temperature of 115°C. III) Dyeing: After the pre-shrinking is completed, dyeing can be carried out directly in the original pre-shrinking overflow cylinder without taking the cylinder out of the cylinder. Add dyeing auxiliaries at room temperature, dye concentration 1-15% owf, dispersant 2-8 g / L, leveling agent 1-4 g / L, penetrant 0.5-3 g / L. At this time, heat up to 105-110°C at a heating rate of 2°C / min until dyeing is completed; IV) Fixing: After dyeing, cool down the original vat, drain the liquid, add insurance powder and soda ash, and wash with reducing water; V) Shaping: The temperature is controlled at 160-180° C. for 30-60 seconds by a padding and tentering method to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

[0011] As a preferred technical solution of the present invention, refining agent and liquid alkali are also added in the pre-shrinking step.

[0012] The beneficial effects of the present invention are as follows: 1. The high shrinkage antibacterial polyester yarn of the present invention has 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.

[0013] 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, combines the knitting structure characteristics, and prepares a moisture-absorbing quick-drying spandex-free elastic knitted fabric with a four-way stretch effect.

[0014] 3. The moisture-absorbing and quick-drying spandex-free elastic knitted fabric of the present invention is interwoven with two fiber materials both of which have quick-drying and antibacterial properties. Both fibers are copolymerized and modified, which greatly reduces the stiffness of polyester and has cotton-like hydrophilicity and softness. The two fibers have high elasticity and certain shrinkage respectively, and there is no need to add spandex. The knitted fabric after dyeing 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

[0015] Figure 1 It is a triangular arrangement diagram of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric of the present invention; Figure 2 This is a diagram of the weaving method of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric of the present invention. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0017] PTT (Polytrimethylene Terephthalate), also known as polytrimethylene terephthalate, is a thermoplastic polyester material.

[0018] PET, the full name of Polyethylene Terephthalate, is a thermoplastic polyester material.

[0019] In all the following examples, the antibacterial agent used is 1-benzyl-3-methylimidazole sulfonate of 5-phthalic acid, which is obtained by ion exchange reaction between 1-benzyl-3-methylimidazole bromide and sodium 2-sulfonate of isophthalic acid. The molecular structure of the antibacterial agent is: ; The specific preparation steps are as follows: First, deionized water accounting for 95% of the total mass, and the remaining amount of sodium 5-sulfoisophthalic acid and 1-benzyl-3-methylimidazole bromide are added to the reaction container, and the molar ratio of sodium 5-sulfoisophthalic acid and 1-benzyl-3-methylimidazole bromide is 1.02:1. At room temperature and pressure, stirring is carried out to fully react for 2 hours, centrifugal filtration is performed to remove water, and then the collected white solid powder is fully washed with deionized water for at least three times, and finally vacuum dried to obtain a white powdery antibacterial agent.

[0020] 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: (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 then tested.

[0021] (2) Moisture absorption and quick-drying properties: It includes four indicators: water absorption rate, drip diffusion time, drying rate and wicking height. It is tested 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".

[0022] (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. Embodiment 1:

[0023] It uses hydrophilic quick-drying composite elastic antibacterial polyester fiber accounting for 70% of the total fabric mass, and high shrinkage antibacterial polyester filament accounting for 30% of the total fabric mass; The preparation method of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric comprises the following steps: Ⅰ) Fabric weaving: A large circular knitting machine is used to weave the hydrophilic quick-drying composite elastic antibacterial polyester fiber and the high shrinkage antibacterial polyester filament to weave the grey cloth. Secondly, the woven grey cloth is inspected and the ends are sewn. The weaving method is as follows: Figure 1 , 2 As shown in the figure): 12 routes are one cycle, wherein the 1st to 5th routes are tucking; the 6th route is looping, floating line, floating line, and tucking in sequence; the 7th to 11th routes are tucking; the 12th route is floating line, tucking, looping, and floating line in sequence; the 1st to 5th routes and the 7th to 11th routes are full needle exit; the 6th and 12th routes are half needle exit, the 1st to 5th routes and the 7th to 11th routes of the fabric are made of hydrophilic quick-drying composite elastic antibacterial polyester fiber, and the 6th and 12th routes are made of high shrinkage antibacterial polyester filament; 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 refers to Chinese patent CN2024105534155; 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, phthalic acid and ethylene glycol. Then, an antibacterial agent and an auxiliary agent (catalyst and titanium dioxide, etc.) are added to the beating kettle respectively 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 pelletization is performed to obtain high shrinkage antibacterial PET slices. Then, the high shrinkage antibacterial PET slices are dried until the moisture content reaches less than 30ppm, enter a screw extruder, and melt extrude. The melt enters a spinning assembly after passing through a filter and a metering pump. Finally, fibers are formed. The fibers are cooled, oiled, hot-stretched, and wound into high shrinkage antibacterial FDY yarns, namely, high shrinkage antibacterial polyester filaments. The amount of the catalyst and titanium dioxide added and the reaction conditions of esterification and polycondensation are the same as those of the preparation conditions of conventional semi-dull PET slices. The acid / alcohol molar ratio of isophthalic acid, phthalic acid and ethylene glycol is 1:1.15; The isophthalic acid accounts for 6 wt % of the terephthalic acid; The antibacterial dosage is 6wt% of terephthalic acid; The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped; Ⅱ) Pre-shrinkage: The grey cloth is pre-shrinked in the dyeing equipment at a temperature of 115°C. During pre-shrinkage, a scouring agent may be added to remove various impurities on the fabric, and an appropriate amount of liquid alkali may also be added; III) Dyeing: After the pre-shrinking is completed, dyeing can be carried out directly in the original pre-shrinking overflow cylinder without taking it out of the cylinder. Add dyeing auxiliaries at room temperature, dye concentration 15% owf, dispersant 8 g / L, leveling agent 4 g / L, penetrant 3 g / L. At this time, heat up to 105-110°C at a heating rate of 2°C / min until dyeing is completed; IV) Color fixation: After dyeing, cool down the original vat, drain the liquid, add insurance powder and soda ash, and perform reduction washing to ensure the feel and color fastness of the fabric; V) Shaping: The method of padding and tentering is adopted, the temperature is controlled at 160° C., and the time is 60 seconds to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric. Embodiment 2:

[0024] It uses hydrophilic quick-drying composite elastic antibacterial polyester fiber accounting for 60% of the total fabric mass, and high-shrinkage antibacterial polyester filament accounting for 40% of the total fabric mass; 1) Fabric weaving: same as in Example 1; Wherein, the isophthalic acid accounts for 8 wt% of the terephthalic acid; The antibacterial dosage is 4wt% of terephthalic acid; The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped; II) Pre-shrinkage process: same as in Example 1; III) Dyeing: After the pre-shrinking is completed, dyeing can be carried out directly in the original pre-shrinking overflow cylinder without taking it out of the cylinder. Add dyeing auxiliaries at room temperature, dye concentration 8% owf, dispersant 6 g / L, leveling agent 3g / L, penetrant 1.5g / L. At this time, heat up to 105-110°C at a heating rate of 2°C / min until dyeing is completed; IV) Fixation: Same as in Example 1; V) Shaping: The method of padding and tentering is adopted, the temperature is controlled at 180° C., and the time is 30 seconds to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric. Embodiment 3:

[0025] It uses hydrophilic quick-drying composite elastic antibacterial polyester fiber accounting for 50% of the total fabric mass, and high shrinkage antibacterial polyester filament accounting for 50% of the total fabric mass; 1) Fabric weaving: same as in Example 1; Wherein, the isophthalic acid accounts for 12 wt% of the terephthalic acid; The antibacterial dosage is 2wt% of terephthalic acid; The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped; II) Pre-shrinkage process: same as in Example 1; III) Dyeing: After the pre-shrinking is completed, dyeing can be carried out directly in the original pre-shrinking overflow cylinder without taking it out of the cylinder. Add dyeing auxiliaries at room temperature, dye concentration 1% owf, dispersant 2 g / L, leveling agent 1 g / L, penetrant 0.5 g / L. At this time, heat up to 105-110°C at a heating rate of 2°C / min until dyeing is completed; IV) Fixation: Same as in Example 1; V) Shaping: The method of padding and tentering is adopted, the temperature is controlled at 170° C., and the time is 50 seconds to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric. Embodiment 4:

[0026] It uses hydrophilic quick-drying composite elastic antibacterial polyester fiber accounting for 65% of the total fabric mass, and high shrinkage antibacterial polyester filament accounting for 35% of the total fabric mass; 1) Fabric weaving: same as in Example 1; Wherein, the isophthalic acid accounts for 10 wt% of the terephthalic acid; The antibacterial dosage is 3wt% of terephthalic acid; The fiber cross section of high shrinkage antibacterial polyester filament is cross-shaped; II) Pre-shrinkage process: same as in Example 1; III) Dyeing: After the pre-shrinking is completed, dyeing can be carried out directly in the original pre-shrinking overflow cylinder without taking it out of the cylinder. Add dyeing auxiliaries at room temperature, dye concentration 5% owf, dispersant 3 g / L, leveling agent 2g / L, penetrant 1.2 g / L. At this time, heat up to 105-110°C at a heating rate of 2°C / min until dyeing is completed; IV) Fixation: Same as in Example 1; V) Shaping: The method of padding and tentering is adopted, the temperature is controlled at 170° C., and the time is 50 seconds to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

[0027] Comparative Example 1: No antibacterial agent is added to the high shrinkage polyester filament used in the knitted fabric, and other schemes and processes are the same as those in Example 4; 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; Table 1 Test results of moisture-absorbing and quick-drying non-spandex elastic knitted fabrics

[0028] 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 Grade 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. The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A moisture-absorbing, quick-drying, spandex-free elastic knitted fabric, the fabric being woven from polyester fibers and polyester filaments, characterized in that: The mass of 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 fabric is knitted with 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, and the 1st to 5th loops and the 7th to 11th loops of the fabric use hydrophilic quick-drying composite elastic antibacterial polyester fibers, and the 6th and 12th loops use high-shrinkage antibacterial polyester filaments.

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 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.

3. The moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to claim 1, characterized in that: 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, phthalic 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, and underwater pelletization is performed to obtain high shrinkage antibacterial PET slices. Then, the high shrinkage antibacterial PET slices are dried until the moisture content reaches less than 30ppm, and then the high shrinkage antibacterial PET slices are entered into a screw extruder for melt extrusion. The melt enters a spinning assembly after passing through a filter and a metering pump. 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, phthalic acid and ethylene glycol is 1:1.15; The isophthalic acid accounts for 6 to 12 wt% of the terephthalic acid; The antibacterial dosage is 2-6wt% of terephthalic acid; The fiber cross section of the high shrinkage antibacterial polyester filament is cross-shaped.

4. The moisture-absorbing and quick-drying non-spandex elastic knitted fabric according to claim 3, characterized in that: The antibacterial agent is 1-benzyl-3-methylimidazole sulfonated with 5-benzylphthalic acid, which is obtained by ion exchange reaction between 1-benzyl-3-methylimidazole bromide and sodium 2-sulfonate of isophthalic acid. The molecular structure of the antibacterial agent is: .

5. The moisture-absorbing and quick-drying non-spandex elastic knitted fabric according to claim 4, 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 amount of sodium 5-sulfoisophthalic acid and 1-benzyl-3-methylimidazole bromide are added to the reaction container, and the molar ratio of sodium 5-sulfoisophthalic acid and 1-benzyl-3-methylimidazole bromide is 1.02:

1. At room temperature and pressure, stirring is carried out to fully react for 2 hours, and centrifugal filtration is performed to remove water. Then, the collected white solid powder is fully washed with deionized water for at least three times, and finally vacuum dried to obtain a white powdery antibacterial agent.

6. The moisture-absorbing and quick-drying non-spandex elastic knitted fabric according to claim 4, characterized in that: The auxiliary agents are catalyst and titanium dioxide.

7. A method for preparing a moisture-absorbing and quick-drying spandex-free elastic knitted fabric according to any one of claims 1 to 6, characterized in that: The following steps are involved: Ⅰ) Fabric weaving: using a large circular knitting machine to weave the polyester fiber and polyester filament as described in any one of claims 1 to 6, and then weaving a grey cloth, and then inspecting the woven grey cloth and sewing the ends; Ⅱ) Pre-shrinkage: The grey cloth is pre-shrinked in the dyeing equipment at a temperature of 115°C. III) Dyeing: After the pre-shrinking is completed, dyeing can be carried out directly in the original pre-shrinking overflow cylinder without taking the cylinder out of the cylinder. Add dyeing auxiliaries at room temperature, dye concentration 1-15% owf, dispersant 2-8 g / L, leveling agent 1-4 g / L, penetrant 0.5-3 g / L. At this time, heat up to 105-110°C at a heating rate of 2°C / min until dyeing is completed; IV) Fixing: After dyeing, cool down the original vat, drain the liquid, add insurance powder and soda ash, and wash with reducing water; V) Shaping: The temperature is controlled at 160-180° C. for 30-60 seconds by a padding and tentering method to obtain the finished product of the moisture-absorbing and quick-drying spandex-free elastic knitted fabric.

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

Images