Moisture absorption and sweat releasing polyester fiber as well as preparation method and application thereof

Abstract

The invention discloses a moisture absorption and sweat releasing polyester fiber and a preparation method and application thereof, and relates to the field of polyester fibers. The moisture absorption and sweat releasing polyester fiber is prepared from the following raw materials in parts by weight: 85 to 95 parts of fiber-grade PET polyester, 4 to 12 parts of PET copolymer, 0.5 to 2.0 parts of dispersing agent and 0.1 to 0.5 part of antioxidant, wherein the PET copolymer is prepared from the following raw materials: terephthalic acid, ethylene glycol, neopentyl glycol, a catalyst and polyethylene glycol. On the basis of terephthalic acid and ethylene glycol, neopentyl glycol and polyethylene glycol are further added, the formed PET copolymer serves as a moisture absorption and sweat releasing modifier and is subjected to melt blending and spinning with fiber-grade PET polyester, hydrophilic groups and a fiber structure are fused into a whole, the moisture absorption and sweat releasing performance of the prepared polyester fiber is improved, and the moisture absorption and sweat releasing effects of the polyester fiber are improved. The durability of the moisture absorption and sweat releasing performance is also ensured.

Description

Technical Field

[0001] This application relates to the field of polyester fiber technology, and in particular to a moisture-wicking polyester fiber, its preparation method, and its application. Background Technology

[0002] Polyester fiber (polyester) possesses a highly regular macromolecular chain structure, characterized by its tightly packed, symmetrical macromolecular chains and rigid benzene rings. This results in advantages such as high strength, good abrasion resistance, and strong wrinkle resistance, making it widely used in the textile and apparel industry. However, the high crystallinity and dense lattice network of polyester fiber, coupled with the lack of hydrophilic functional groups, hinders the penetration and diffusion of moisture within the fiber, leading to poor moisture absorption and wicking properties in polyester textile products.

[0003] In recent years, people have placed increasing demands on the comfort and health benefits of clothing fabrics, thus requiring polyester fiber clothing fabrics to have moisture-wicking properties. Chemical modification methods are commonly used to improve the moisture-wicking properties of polyester fibers.

[0004] Chemical modification often involves adding a layer of hydrophilic compound to the fiber surface. This method is simple, inexpensive, and largely preserves the original properties of the fiber, while also improving its moisture-wicking performance to some extent. However, the amount of hydrophilic finishing agent fixed decreases significantly after repeated washing, leading to a substantial reduction in moisture-wicking performance. To maintain the durability of moisture-wicking properties, a method of graft copolymerization with hydrophilic groups is also used.

[0005] However, due to the tight aggregation ability and high crystallinity of the polyester fiber molecular chain structure, the grafting of hydrophilic groups often requires strong radiation-induced conditions such as radiation or electron beams. Although the modified fibers obtained by grafting copolymerization have given them durable moisture-wicking properties, they are also more expensive. Summary of the Invention

[0006] The main purpose of this application is to propose a moisture-wicking polyester fiber, its preparation method and application, aiming to solve the problems of high cost and poor moisture-wicking durability of existing chemically modified polyester fibers.

[0007] In a first aspect, this application provides a moisture-wicking polyester fiber comprising the following raw materials in parts by weight: 85-95 parts of fiber-grade PET polyester, 4-12 parts of PET copolymer, 0.5-2.0 parts of dispersant, and 0.1-0.5 parts of antioxidant; The raw materials for preparing the PET copolymer include terephthalic acid, ethylene glycol, neopentyl glycol, catalyst, and polyethylene glycol, and the weight ratio of terephthalic acid, ethylene glycol, neopentyl glycol, catalyst, and polyethylene glycol is 1660:(740-810):(31-104):(0.5-0.8):(0.5-1.5).

[0008] By adopting the above-mentioned technical solution, this application, based on terephthalic acid and ethylene glycol, further adds neopentyl glycol and polyethylene glycol to form a PET copolymer, which serves as a moisture-wicking modifier. This copolymer is then melt-blended and spun with fiber-grade PET polyester, achieving the integration of hydrophilic groups with the fiber structure. This not only improves the moisture-wicking properties of the resulting polyester fiber but also ensures the durability of these properties. Furthermore, this application eliminates the need for strong radiation such as radiation or electron beams during the preparation process, reducing production costs.

[0009] For PET copolymers, under catalytic conditions, terephthalic acid and ethylene glycol can undergo esterification to produce polyethylene terephthalate (BHET). Since esterification is a reversible reaction, an appropriate excess of ethylene glycol is required to drive the reaction towards the target product, ensuring the forward reaction proceeds and reducing the amount of by-products. After esterification, neopentyl glycol is added, and after a certain reaction time, polyethylene glycol is added to continue the reaction, producing the PET copolymer. The addition of small-molecule neopentyl glycol can more effectively introduce flexible carbon-carbon segments into the polyester macromolecules. Furthermore, the two side methyl structures of neopentyl glycol effectively prevent polyester molecular chains from approaching or overlapping, effectively improving the looseness of the polyester macromolecular chains and disrupting their regularity. Combined with large-molecule polyethylene glycol, phase separation occurs, forming a two-phase separated micro-region structure. The increased microphase separation promotes the formation of amorphous regions with soft segments, thereby significantly improving the moisture-wicking properties of polyester fibers.

[0010] In the technical solution of this application, based on terephthalic acid and ethylene glycol, a specific amount of neopentyl glycol and polyethylene glycol are added. Through the special molecular structures of their respective molecules, neopentyl glycol and polyethylene glycol work together to effectively improve the moisture absorption and wicking properties of polyester fibers.

[0011] Optionally, the weight ratio of the fiber-grade PET polyester to the PET copolymer is 90:(7-10).

[0012] By adopting the above technical solution and further optimizing the ratio of fiber-grade PET polyester to PET copolymer during melt blending, the moisture absorption and wicking properties and durability of the resulting polyester fiber can be further improved.

[0013] Optionally, the method for preparing the PET copolymer includes: (1) Terephthalic acid, ethylene glycol and catalyst are mixed and stirred for 1.5 to 2.5 h under a nitrogen protective atmosphere, with the temperature controlled at 220 to 250 °C and the pressure at 0.2 to 0.4 MPa, to obtain the esterification reaction product. (2) Control the reaction product obtained in step (1) under normal pressure, add neopentyl glycol, stir and react for 10-30 min, add polyethylene glycol, stir and react for 30-60 min, and then polycondense under vacuum at a temperature of 270-280℃ for 2-3 h. Discharge and pelletize to obtain the PET copolymer.

[0014] By adopting the above technical solution, under the condition of a catalyst, terephthalic acid and ethylene glycol can undergo an esterification reaction to generate ethylene terephthalate (BHET). Then, neopentyl glycol and polyethylene glycol are added to undergo a polycondensation reaction, and the resulting PET copolymer can effectively improve the moisture absorption and wicking properties and durability of polyester fibers.

[0015] Optionally, in the PET copolymer, the weight ratio of neopentyl glycol to polyethylene glycol is (56-89):(1.0-1.2).

[0016] By adopting the above technical solution and further optimizing the ratio of neopentyl glycol to polyethylene glycol, the advantages of both can be fully utilized. Through the special molecular structures of their respective molecules, neopentyl glycol and polyethylene glycol work together to effectively improve the moisture absorption and wicking properties of polyester fibers.

[0017] Optionally, in the PET copolymer, the molecular weight of polyethylene glycol is 500 to 3000.

[0018] By adopting the above technical solution and controlling the molecular weight of polyethylene glycol to ensure increased microphase separation, the amorphous region is increased, thereby improving the moisture absorption and wicking properties of polyester fibers.

[0019] Preferably, in the PET copolymer, the molecular weight of polyethylene glycol is 800 to 2000.

[0020] Optionally, in the PET copolymer, the polyethylene glycol includes PEG800 and PEG2000, and the weight ratio of PEG800 to PEG2000 is (0.4-0.6):(0.6-0.8).

[0021] By adopting the above technical solution and further optimizing the combination of different molecular weights of polyethylene glycol, the increase in amorphous regions can be further improved, thereby further enhancing the moisture absorption and wicking properties of polyester fibers.

[0022] Optionally, the dispersant is selected from at least one of calcium stearate and zinc stearate; and / or, The antioxidant is selected from at least one of 2,4-di-(n-octylthionyl)-6-methylphenol and 2,4-di-(dodecylthionyl)-6-methylphenol; and / or, In the PET copolymer, the catalyst is selected from at least one of antimony glycol and antimony trioxide.

[0023] Optionally, the raw materials for preparing the PET copolymer further include a stabilizer, wherein the stabilizer is triphenyl phosphate, and the weight ratio of terephthalic acid, ethylene glycol, neopentyl glycol, catalyst, polyethylene glycol and triphenyl phosphate is 1660:(740-810):(31-104):(0.5-0.8):(0.5-1.5):(0.5-0.8).

[0024] Secondly, this application provides a method for preparing moisture-wicking polyester fibers as described in any of the above claims, comprising the following steps: S1. The fiber-grade PET polyester and PET copolymer are pre-crystallized and dried respectively, and the dispersant and antioxidant are dried respectively. S2. The dried fiber-grade PET polyester, PET copolymer, dispersant and antioxidant obtained in step S1 are melt-blended and then extruded, spun into shape, stretched and shaped and wound to obtain the moisture-wicking polyester fiber.

[0025] By employing the above-mentioned technical solution, PET copolymer is used as a moisture-wicking modifier, melt-blended and spun with fiber-grade PET polyester, achieving the integration of hydrophilic groups with the fiber structure. This improves the moisture-wicking performance of the resulting polyester fiber while ensuring its durability. Furthermore, this application eliminates the need for strong radiation such as radiation or electron beams during the preparation process, reducing production costs.

[0026] It should be noted that "pre-crystallizing and drying fiber-grade PET polyester and PET copolymer respectively" refers to pre-crystallizing and drying fiber-grade PET polyester and pre-crystallizing and drying PET copolymer.

[0027] Optionally, in step S2, the melt blending of the dried fiber-grade PET polyester, PET copolymer, dispersant and antioxidant includes: mixing the dried fiber-grade PET polyester, PET copolymer, dispersant and antioxidant, stirring thoroughly to obtain a premix, adding the premix to a twin-screw extruder for melt blending, and spinning the extruded melt through a spinneret, wherein the cross-sectional shape of the spinneret orifice is cross-shaped or pentagonal.

[0028] By employing the above technical solution, the dried PET polyester, PET copolymer, dispersant, and antioxidant are premixed to form a premix, which is then melt-blended. This improves the dispersibility of the mixture, thereby enhancing the moisture-wicking properties of the resulting polyester fiber. The spinneret's cross-sectional shape is cross-shaped or pentaf-shaped, i.e., irregularly shaped, to increase the specific surface area of ​​the polyester fiber through physical modification. This facilitates moisture diffusion and evaporation, further improving the moisture-wicking properties and durability of the resulting polyester fiber.

[0029] Thirdly, this application also provides the application of moisture-wicking polyester fiber as described in any of the above claims in clothing fabrics.

[0030] By adopting the above technical solution, the polyester fiber obtained in this application has excellent moisture absorption and wicking properties, and the durability of these properties is also excellent. Applying this polyester fiber to clothing fabrics, especially to underwear, effectively improves the comfort of wearing the garment.

[0031] In summary, this application includes at least one of the following beneficial technical effects: 1. This application, based on terephthalic acid and ethylene glycol, further adds neopentyl glycol and polyethylene glycol to form a PET copolymer, which serves as a moisture-wicking modifier. This copolymer is then melt-blended and spun with fiber-grade PET polyester, achieving the integration of hydrophilic groups with the fiber structure. This improves both the moisture-wicking properties of the resulting polyester fiber and ensures the durability of these properties. Furthermore, this application eliminates the need for strong radiation such as radiation or electron beams during the preparation process, reducing production costs.

[0032] 2. In the technical solution of this application, based on terephthalic acid and ethylene glycol, a specific amount of neopentyl glycol and polyethylene glycol are further added. Neopentyl glycol and polyethylene glycol, through their respective special molecular structures, work together to effectively improve the moisture absorption and wicking properties of polyester fibers.

[0033] 3. The addition of neopentyl glycol, a small molecule, can more effectively introduce flexible carbon-carbon segments into the polyester macromolecule. Furthermore, the two side methyl structures of neopentyl glycol can effectively prevent polyester molecular chains from approaching or overlapping, thus effectively improving the looseness of the polyester macromolecular chains and disrupting their regularity. Combined with the large molecule polyethylene glycol, phase separation can occur, forming a two-phase separated micro-region structure. The increase in micro-phase separation promotes the formation of amorphous regions of soft segments, thereby significantly improving the moisture absorption and wicking properties of polyester fibers. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the embodiments.

[0035] Raw material description Terephthalic acid: Purified terephthalic acid, Nantong Zhonghe Chemical New Materials Co., Ltd.; PEG 2000: Molecular weight 1800-2200, Nantong Chenrun Chemical Co., Ltd.; PEG 800: Molecular weight 720-880, Nantong Chenrun Chemical Co., Ltd.; Fiber-grade PET polyester: Dongguan Jinshixiang Plastic Raw Materials Co., Ltd., model 530.

[0036] Preparation Examples 1-6 Preparation Examples 1-6 provide a method for preparing PET copolymers. The raw materials and amounts used are shown in Table 1 below. The specific preparation method includes the following steps: (1) Terephthalic acid, ethylene glycol and antimony trioxide are mixed and stirred at a stirring rate of 100 rpm for 15 min to obtain a mixture. The mixture is added to a reaction vessel and stirred at a stirring rate of 100 rpm. Under a nitrogen protective atmosphere, the temperature inside the vessel is controlled at 235℃ and the pressure is 0.3 MPa to carry out the esterification reaction. The reaction is stirred for 2 h. The esterification reaction is then completed, and the pressure inside the vessel is controlled at atmospheric pressure. (2) Stir at a stirring speed of 100 rpm, add neopentyl glycol to the reactor, and control the addition time of neopentyl glycol to 30 min. After the addition is completed, stir at a stirring speed of 100 rpm for 15 min, then add polyethylene glycol (PEG 2000) and control the addition time of PEG 2000 to 30 min. After the addition is completed, stir at a stirring speed of 100 rpm for 40 min, reduce the pressure in the reactor at a depressurization rate of 2 kPa / min until the pressure in the reactor is maintained at 40 Pa. While depressurizing, raise the temperature in the reactor to 275 °C. At this temperature, stir at a stirring speed of 50 rpm for 2.5 h, discharge the material and granulate it to obtain PET copolymer.

[0037] Table 1. Amount of raw materials used in the preparation of PET copolymers (unit: parts by weight) Preparation Examples 7-9 Preparation Examples 7-9 are based on Preparation Example 3, except that the weight percentage of polyethylene glycol remains constant at 1.2 parts, the molecular weight of the polyethylene glycol is adjusted, and the other steps are the same as in Preparation Example 3. Specifically, In Preparation Example 7, polyethylene glycol was obtained by mixing PEG 800 and PEG 2000, with PEG 800 accounting for 0.4 parts by weight and PEG 2000 accounting for 0.8 parts by weight.

[0038] In Preparation Example 8, polyethylene glycol was obtained by mixing PEG 800 and PEG 2000, with PEG 800 accounting for 0.5 parts by weight and PEG 2000 accounting for 0.7 parts by weight.

[0039] In Preparation Example 9, polyethylene glycol was obtained by mixing PEG 800 and PEG 2000, with PEG 800 having a weight percentage of 0.6 parts and PEG 2000 having a weight percentage of 0.6 parts.

[0040] Preparation of Comparative Example 1 This preparation example is based on Preparation Example 3, the difference being that polyethylene glycol is not included in the raw materials, while the other steps are the same as in Preparation Example 3. Specifically, step (2) of this preparation example is as follows: stirring at a stirring speed of 100 rpm, adding neopentyl glycol to the reactor, controlling the addition time of neopentyl glycol to be 30 min, stirring at a stirring speed of 100 rpm for 15 min after the addition is completed, reducing the pressure in the reactor at a depressurization rate of 2 kPa / min until the pressure in the reactor is maintained at 40 Pa, while reducing the pressure, raising the temperature in the reactor to 275 °C, stirring at a stirring speed of 50 rpm for 2.5 h at this temperature, discharging and pelletizing to obtain PET copolymer.

[0041] Preparation of Comparative Example 2 This preparation example is based on Preparation Example 3, the difference being that neopentyl glycol is not included in the raw materials, while the other steps are the same as in Preparation Example 3. Specifically, step (2) of this preparation example is as follows: while maintaining a stirring speed of 100 rpm, polyethylene glycol (PEG 2000) is added to the reactor, and the addition time of polyethylene glycol is controlled to be 30 min. After the addition is completed, the mixture is stirred at a stirring speed of 100 rpm for 40 min, and the pressure in the reactor is reduced at a depressurization rate of 2 kPa / min until the pressure in the reactor is maintained at 40 Pa. While depressurizing, the temperature in the reactor is raised to 275 °C. At this temperature, the mixture is stirred at a stirring speed of 50 rpm for 2.5 h, and then discharged and pelletized to obtain the PET copolymer.

[0042] Examples 1-6 Examples 1-6 provide a method for preparing moisture-wicking polyester fibers. The raw materials and amounts used are shown in Table 2 below. The PET copolymer in Table 2 is obtained from Preparation Example 1. The specific preparation method includes the following steps: S1. The fiber-grade PET polyester and PET copolymer are pre-crystallized and dried respectively, and the dispersant and antioxidant are dried respectively.

[0043] (1) The fiber-grade PET polyester was kept at 100℃ for 1h, heated to 130℃ at a heating rate of 10℃ / min, kept at 130℃ for 2.5h, heated to 150℃ at a heating rate of 10℃ / min, dried for 24h, and then cooled to 25℃ naturally to obtain the dried fiber-grade PET polyester. (2) Referring to the method of pre-crystallization and drying of fiber-grade PET polyester, the PET copolymer was pre-crystallized and dried to obtain the dried PET copolymer; (3) Calcium stearate and 2,4-di-(n-octylthionyl)-6-methylphenol were dried under vacuum at 90°C for 5 h to obtain dried calcium stearate and dried 2,4-di-(n-octylthionyl)-6-methylphenol.

[0044] S2. The dried fiber-grade PET polyester, PET copolymer, calcium stearate and 2,4-di-(n-octylthionyl)-6-methylphenol obtained in step S1 are added to a twin-screw extruder for melt blending. The operating conditions of the twin-screw extruder are: zone 1 temperature 270℃, zone 2 temperature 275℃, zone 3 temperature 280℃, zone 4 temperature 280℃, and screw speed 200 rpm.

[0045] S3. The melt extruded from the twin-screw extruder is fed into a metering pump, and the temperature inside the metering pump is controlled at 278℃. The metering pump then feeds the melt into the spinning box, and the temperature inside the spinning box is controlled at 275℃. After the melt flows out of the spinning box, it is spun through a spinneret. The cross-section of the spinneret's spinneret orifice is cross-shaped (the transverse length of the spinneret orifice is 0.2mm, and the longitudinal length is 0.4mm). The spinning temperature is controlled at 270℃. The spinning is then cooled by a cooling air temperature of 25℃ and a wind speed of 1.0m / s.

[0046] S4. The cooled nascent fibers are stretched. The temperature of the hot plate is controlled at 90°C and the stretching ratio is 5 times. Then, heat setting is performed at 135°C for 50 seconds and the setting tension is 8 cN / dtex. Finally, the fibers are wound into shape by a winding machine at a speed of 1000 m / min to obtain moisture-wicking polyester fibers.

[0047] Table 2. Raw materials and dosage of moisture-wicking polyester fibers (unit: parts by weight) Examples 7-14 Examples 7-14 are based on Example 3, the difference being that the source of the PET copolymer is different, while the other steps remain the same as in Example 3. Specifically, In Example 7, 10 parts by weight of the PET copolymer prepared in Preparation Example 2 were used.

[0048] In Example 8, 10 parts by weight of the PET copolymer prepared in Preparation Example 3 were used.

[0049] In Example 9, 10 parts by weight of the PET copolymer prepared in Preparation Example 4 were used.

[0050] In Example 10, 10 parts by weight of the PET copolymer prepared in Preparation Example 5 were used.

[0051] In Example 11, 10 parts by weight of the PET copolymer prepared in Preparation Example 6 were used.

[0052] In Example 12, 10 parts by weight of the PET copolymer prepared in Preparation Example 7 were used.

[0053] In Example 13, 10 parts by weight of the PET copolymer prepared in Preparation Example 8 were used.

[0054] In Example 14, 10 parts by weight of the PET copolymer prepared in Preparation Example 9 were used.

[0055] Example 15 This embodiment is based on Example 13, the difference being that the mixing method in step S2 has changed, while the other steps remain the same as in Example 13. Specifically, in step S2 of this embodiment: the dried fiber-grade PET polyester, PET copolymer, calcium stearate, and 2,4-di-(n-octylthionyl)-6-methylphenol obtained in step S1 are mixed and stirred at a stirring rate of 100 rpm for 30 min to obtain a premix. The premix is ​​then added to a twin-screw extruder for melt blending. The operating conditions of the twin-screw extruder are: zone 1 temperature 270℃, zone 2 temperature 275℃, zone 3 temperature 280℃, zone 4 temperature 280℃, and screw speed 200 rpm.

[0056] Comparative Examples 1-2 Comparative Examples 1 and 2 are based on Example 3, the difference being that the source of the PET copolymer is different, while the other steps remain the same as in Example 3. Specifically, In Comparative Example 1, 10 parts by weight were used to prepare the PET copolymer obtained in Comparative Example 1.

[0057] In Comparative Example 2, 10 parts by weight were used to prepare the PET copolymer obtained in Comparative Example 2.

[0058] Comparative Example 3 This comparative example is based on Example 3, except that the amount of PET copolymer used is 2 parts by weight, and the other steps are the same as in Example 3.

[0059] Performance testing The polyester fibers obtained in Examples 1-15 and Comparative Examples 1-3 were woven into fabrics. Fabric samples with dimensions of 10cm × 10cm were taken and tested for water absorption rate and moisture evaporation rate before and after washing, according to the method in GB / T21655.1-2008. The washing cycle was 10 times. The test results are shown in Table 3 below.

[0060] Table 3. Test results of water absorption rate and water evaporation rate Based on the examples, comparative examples, and the experimental results in Table 3, it can be seen that this application, by further adding neopentyl glycol and polyethylene glycol to terephthalic acid and ethylene glycol, forms a PET copolymer that serves as a moisture-wicking modifier. This copolymer is then melt-blended and spun with fiber-grade PET polyester, achieving the integration of hydrophilic groups with the fiber structure. This not only improves the moisture-wicking performance of the resulting polyester fiber but also ensures the durability of its moisture-wicking properties.

[0061] Examples 1-4 investigated the effect of the amount of PET copolymer on the moisture-wicking properties of the resulting polyester fibers. Both excessive and insufficient amounts of PET copolymer negatively impacted the material's moisture-wicking properties. Experimental results showed that when the weight ratio of fiber-grade PET polyester to the PET copolymer was 90:(7-10), the resulting polyester fibers exhibited excellent moisture-wicking properties. Examples 5-6 investigated the effect of the amount of raw materials other than the PET copolymer on the moisture-wicking properties of the resulting polyester fibers. Among Examples 1-6, Example 3 was the preferred embodiment.

[0062] Examples 7-14, based on Example 3, investigated the effects of different PET copolymers on the moisture-wicking properties of the resulting polyester fibers. Different amounts of neopentyl glycol and polyethylene glycol, as well as the molecular weight of polyethylene glycol, all affected the moisture-wicking properties of the resulting polyester fibers during the preparation of the PET copolymers. Example 15, based on Example 13, involved mixing the raw materials to form a premix before melt blending. This premix was then added to a twin-screw extruder for melt blending, which helped improve the dispersibility of the materials and thus improved the moisture-wicking properties of the resulting polyester fibers.

[0063] Comparative Examples 1-3, based on Example 3, investigated the effects of neopentyl glycol, polyethylene glycol, and the amount of PET copolymer used as raw materials for the preparation of PET copolymer on the moisture-wicking properties of the resulting polyester fibers.

[0064] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A moisture-absorbing and perspiration-dissipating polyester fiber, characterized by comprising: The raw materials include the following components in parts by weight: 85-95 parts of fiber grade PET polyester, 4-12 parts of PET copolymer, 0.5-2.0 parts of dispersant, and 0.1-0.5 parts of antioxidant. The raw materials for preparing the PET copolymer include terephthalic acid, ethylene glycol, neopentyl glycol, a catalyst, and polyethylene glycol, and the weight ratio of the terephthalic acid, ethylene glycol, neopentyl glycol, catalyst, and polyethylene glycol is 1660: (740-810): (31-104): (0.5-0.8): (0.5-1.5).

2. The moisture-wicking polyester fiber according to claim 1, wherein, The weight ratio of the fiber grade PET polyester to the PET copolymer is 90: (7-10).

3. The moisture-wicking polyester fiber according to claim 1, wherein, The preparation method of the PET copolymer includes: (1) mixing terephthalic acid, ethylene glycol, and a catalyst, controlling the temperature to be 220-250℃ and the pressure to be 0.2-0.4 MPa under a nitrogen protective atmosphere, and stirring for 1.5-2.5 h to obtain an esterification product; (2) controlling the esterification product obtained in step (1) to be under normal pressure, adding neopentyl glycol and stirring for 10-30 min, adding polyethylene glycol and stirring for 30-60 min, and performing polycondensation under a vacuum at a temperature of 270-280℃ for 2-3 h, discharging, and granulating to obtain the PET copolymer.

4. The moisture-wicking polyester fiber according to claim 1, wherein, In the PET copolymer, the weight ratio of neopentyl glycol to polyethylene glycol is (56-89): (1.0-1.2).

5. The moisture-wicking polyester fiber according to claim 1, wherein, In the PET copolymer, the molecular weight of the polyethylene glycol is 500-3000.

6. The moisture-wicking polyester fiber according to claim 5, wherein, In the PET copolymer, the polyethylene glycol includes PEG 800 and PEG 2000, and the weight ratio of the PEG 800 to the PEG 2000 is (0.4-0.6): (0.6-0.8).

7. The moisture-wicking polyester fiber according to claim 1, wherein, The dispersant is selected from at least one of calcium stearate and zinc stearate; and / or, The antioxidant is selected from at least one of 2,4-di-(n-octyl thio-methylene)-6-methyl phenol and 2,4-di(dodecyl thio-methyl)-6-methyl phenol; and / or, In the PET copolymer, the catalyst is selected from at least one of ethylene glycol antimony and diantimony trioxide.

8. A method of producing the moisture-absorbing and perspiration-dissipating polyester fiber according to any one of claims 1 to 7, characterized by, The method includes the following steps: S1, separately pre-crystallizing and drying the fiber grade PET polyester and the PET copolymer, and separately drying the dispersant and the antioxidant; S2, melt blending the fiber grade PET polyester, the PET copolymer, the dispersant, and the antioxidant obtained after the drying in step S1, and forming into a fiber by extrusion, spinning, stretching, and setting, to obtain the moisture-wicking polyester fiber.

9. The method for producing a moisture-absorbing and perspiration-diffusing polyester fiber according to claim 8, characterized by, In step S2, melt blending the fiber grade PET polyester, the PET copolymer, the dispersant, and the antioxidant after the drying includes: mixing the fiber grade PET polyester, the PET copolymer, the dispersant, and the antioxidant after the drying, fully stirring to obtain a premix, and adding the premix into a double-screw extruder for melt blending, extruding the melt through a spinneret, and the cross-sectional shape of the spinneret holes being cross-shaped or five-leaf-shaped.

10. Use of a moisture-wicking polyester fiber according to any one of claims 1 to 7 in a garment fabric.

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