Manufacturing method of functional polyester fiber

Abstract

The invention relates to the technical field of polyester fibers, and particularly discloses a manufacturing method of functional polyester fibers. The invention relates to a functional polyester fiber manufacturing method, which comprises: S1, PET preparation: pumping purified terephthalic acid (PTA) into a slurry tank, adding ethylene glycol (EG) and a hydrophilic monomer to prepare a slurry, completely mixing, feeding into an esterification kettle for esterification, and carrying out polycondensation on the esterified prepolymer in a polycondensation kettle to form the hydrophilic PET; s2, PBT preparation: polybutylene terephthalate PBT slices are dried and crystallized, and then cool master batches are added in the screw melting process for blending preparation; s3, polyester fiber preparation, wherein a hydrophilic monomer is selected from one or more of thermoplastic starch, walnut polyphenol and chestnut shell polyphenol. The functional polyester fiber can be used in textiles and has the advantage of being good in moisture absorption and sweat releasing effects.

Description

Technical Field

[0001] The present application relates to the technical field of polyester fibers, and more specifically, to a method for manufacturing functional polyester fibers. Background Art

[0002] Although the common polyester fiber products on the market have high strength and elastic recovery ability, they are not good in terms of moisture absorption and perspiration resistance and wear resistance. Especially when exercising for a long time in outdoor environment, the clothes are easy to accumulate sweat, causing dampness and discomfort, and are easy to wear and tear, affecting the wearing experience and service life. In recent years, with people's pursuit of a healthy lifestyle, outdoor sports and fitness have become popular trends, and the market demand for high-quality sportswear fabrics has been growing, which has promoted the research and development of high-performance polyester fibers, aiming to develop new fibers with functions such as wear resistance, moisture absorption and perspiration, antibacterial and deodorizing, constant temperature control, waterproof and breathable. Summary of the invention

[0003] In order to improve the defect of poor moisture absorption and perspiration wicking effect of current polyester fibers, the present application provides a method for manufacturing functional polyester fibers, which adopts the following technical solution:

[0004] The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0005] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0006] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0007] S3, preparation of polyester fiber: the hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber;

[0008] The hydrophilic monomer is selected from one or more of thermoplastic starch, walnut polyphenols, and chestnut shell polyphenols.

[0009] By adopting the above technical scheme, preferably adding a hydrophilic monomer to PET, adding a cooling masterbatch to PBT, and preparing polyester fibers through composite spinning, the polyester fibers can obtain excellent moisture absorption, perspiration and cooling effects, and effectively improve the wearing experience of textiles prepared from polyester fibers in summer.

[0010] Thermoplastic starch is preferably used as the hydrophilic monomer, and starch and PET have good compatibility. The hydrophilic properties of thermoplastic starch are used to make the polyester fiber obtain excellent hydrophilic effect, that is, moisture absorption effect, which is beneficial to the use of polyester fiber. The thermoplastic starch is preferably porous thermoplastic starch, and a porous structure is introduced into PET to increase the pore structure in the polyester fiber, thereby further improving the moisture absorption and perspiration and breathability of the polyester fiber.

[0011] Walnut polyphenol is preferably used as the hydrophilic monomer. Walnut polyphenol has a large number of hydrophilic -OH groups. Therefore, adding walnut polyphenol to PET can introduce a large number of -OH hydrophilic groups, giving PET an excellent hydrophilic effect, so that the polyester fiber obtains an excellent moisture absorption and perspiration effect.

[0012] It is preferred to use chestnut shell polyphenol as the hydrophilic monomer. Chestnut shell polyphenol has a large number of hydrophilic -OH groups. Therefore, adding chestnut shell polyphenol to PET can introduce a large number of -OH hydrophilic groups, giving PET an excellent hydrophilic effect, so that the polyester fiber obtains an excellent moisture absorption and perspiration effect.

[0013] Thermoplastic starch can form an inclusion complex with walnut polyphenols or chestnut shell polyphenols, that is, thermoplastic starch can serve as a connecting material between walnut polyphenols or chestnut shell polyphenols and PET, thereby improving the bonding effect between walnut polyphenols and chestnut shell polyphenols and PET, so that the -OH groups in the polyphenols can be fully grafted into PET, thereby enabling the polyester fiber to obtain a stable and excellent moisture absorption and perspiration effect.

[0014] Finally, the hydrophilic monomers in the present application are all made of biomass materials, which have a high environmental protection effect and are not easy to produce substances that affect the environment, thereby improving the environmental protection and safety of polyester fibers.

[0015] Optionally, the extraction method of walnut polyphenols is as follows: add walnut green peel to an ethanol solution, perform ultrasonic extraction for 30 minutes, separate by centrifugation, and retain the supernatant, which is the walnut polyphenols.

[0016] By adopting the above technical scheme, the extraction method of walnut polyphenols is optimized, and walnut polyphenols are extracted from walnut green peel waste, which is beneficial to the recycling of waste and effectively reduces the production cost of walnut polyphenols. The obtained modifier is a biomass modifier, which is environmentally friendly.

[0017] Optionally, the preparation method of the chestnut shell polyphenol is as follows: chestnut shells are removed from impurities, washed, air-dried, and crushed to obtain chestnut shell powder, which is then soaked in an ethanol aqueous solution in a water bath, filtered, the filtrate is retained, and evaporated to dryness to obtain chestnut shell polyphenols.

[0018] By adopting the above technical scheme, the preparation of chestnut shell polyphenols is optimized, chestnut shells are used to extract polyphenol substances, and the waste is fully reused, so that the production cost of polyphenol modifiers is reduced, biomass environmentally friendly modifiers are obtained, and the environmental protection effect of polyester fibers is improved.

[0019] Optionally, the starch is thermoplastic starch, and the thermoplastic starch is selected from any one of corn starch, potato starch and sweet potato starch.

[0020] By adopting the above technical solution, corn starch, potato starch and sweet potato starch can improve the hydrophilic effect of PET.

[0021] Optionally, the cooling masterbatch is selected from at least one of jade powder masterbatch, peppermint oil microcapsule or xylitol.

[0022] By adopting the above technical solution, jade powder masterbatch is preferably used as the cooling masterbatch. The cooling properties of the jade powder itself give PBT and polyester fibers a cooling feeling, thereby improving the wearing experience of fabrics made of polyester fibers in summer.

[0023] Peppermint oil microcapsules are preferred as cooling masterbatch. Menthol in peppermint oil can activate cold-sensitive receptors on the skin, thereby producing a cooling sensation to improve the wearing experience of polyester fibers. In addition, the microcapsule structure can slowly release peppermint oil, giving polyester fibers a long-lasting cooling effect.

[0024] Xylitol is preferably used as the cooling masterbatch. Due to its good water solubility, xylitol can be decomposed in sweat to absorb heat and generate a cooling effect, thereby providing the polyester fiber with a cooling effect.

[0025] Optionally, the cooling masterbatch further comprises a xylitol-menthol co-crystallization product.

[0026] By adopting the above technical scheme, the co-crystallization product of xylitol-menthol is preferably used as the cooling masterbatch. Since menthol is relatively volatile, the co-crystallization product of xylitol-menthol can improve the stability of menthol. As xylitol absorbs heat after contacting sweat, it gives the skin a cooling experience, further improving the cooling experience of the polyester fiber and improving the wearing experience of the fabric.

[0027] Optionally, the added amount of the hydrophilic monomer is 1%-10%.

[0028] By adopting the above technical solution, the addition amount of the hydrophilic monomer is optimized, and the appropriate addition amount can enable the polyester fiber to obtain an excellent moisture absorption effect and is not prone to being too hydrophilic.

[0029] Optionally, in step S3, the hydrophilic PET, PBT and polycaprolactam prepared above are subjected to parallel composite spinning through a composite spinneret to obtain composite fibers, which are then treated with alkali solution to obtain polyester fibers.

[0030] By adopting the above technical solution, since polycaprolactam is an alkali-intolerant product, the composite fiber can be treated with alkali solution to dissolve the polycaprolactam, so that the polyester fiber can obtain more porous structures, which is beneficial to improving the moisture absorption and perspiration removal effect of the polyester fiber.

[0031] In summary, this application has the following beneficial effects:

[0032] 1. Since the present application preferably uses thermoplastic starch as a hydrophilic monomer, starch and PET have good compatibility, and the hydrophilic properties of thermoplastic starch are utilized to make the polyester fiber obtain an excellent hydrophilic effect, that is, a hygroscopic effect, which is beneficial to the use of polyester fiber. Preferably, the thermoplastic starch is porous thermoplastic starch, and a porous structure is introduced into PET to increase the pore structure in the polyester fiber, thereby further improving the moisture absorption and perspiration and breathability of the polyester fiber.

[0033] 2. Thermoplastic starch can form inclusion complexes with walnut polyphenols or chestnut shell polyphenols, that is, thermoplastic starch can be used as a connecting material between walnut polyphenols or chestnut shell polyphenols and PET, thereby improving the bonding effect between walnut polyphenols and chestnut shell polyphenols and PET, so that the -OH groups in the polyphenols can be fully grafted into PET, thereby enabling the polyester fiber to obtain a stable and excellent moisture absorption and perspiration effect.

[0034] 3. In the present application, the co-crystallization product of xylitol-menthol is preferably used as the cooling masterbatch. Since menthol is relatively volatile, the co-crystallization product of xylitol-menthol can improve the stability of menthol. As xylitol absorbs heat after contacting sweat, it gives the skin a cooling experience, further improving the cooling experience of the polyester fiber and improving the wearing experience of the fabric.

[0035] 4. In the present application, since polycaprolactam is an alkali-intolerant product, the composite fiber is treated with alkali solution to dissolve the polycaprolactam, so that the polyester fiber obtains more porous structures, which is beneficial to improving the moisture absorption and perspiration removal effect of the polyester fiber. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to the embodiments.

[0037] Preparation Example

[0038] Walnut polyphenol preparation example

[0039] Preparation Example 1: The extraction method of walnut polyphenols is as follows: take walnut green peel and add it to ethanol solution, ultrasonically extract for 30 minutes, centrifuge and separate, and retain the supernatant, which is walnut polyphenols.

[0040] Polyisoprene Preparation Example

[0041] Preparation Example 2: The preparation method of chestnut shell polyphenol is as follows: chestnut shell is removed from impurities, washed, air-dried, and crushed to obtain chestnut shell powder, which is then soaked in an ethanol aqueous solution in a water bath, filtered, and the filtrate is retained and evaporated to dryness to obtain chestnut shell polyphenol.

[0042] Preparation Example of Peppermint Oil Microcapsules

[0043] Preparation Example 3: First, prepare gelatin and gum arabic solutions with a certain mass fraction of 1% respectively in a 50°C water bath. Then, mix the two solutions with the same mass fraction in equal volumes. When the mass fraction of the wall material is fixed, the peppermint essential oil and the mixed solution are emulsified at high speed for 3 minutes with an emulsifier homogenizer at a certain core-wall ratio of 2:1. Then, under heating in a 40°C water bath, stir the mixed solution with a mechanical stirrer at a certain speed of 600r / min, and adjust the pH value to a certain value of 3.7 with 10% acetic acid. After 30 minutes, reduce the temperature to below 10°C, and then adjust the pH value to about 6.0 with 10% sodium bicarbonate. After adding 0.6g of transglutaminase, solidify and continue the reaction for a period of 6 hours. Finally, filter, wash, centrifuge and dry the reaction solution to obtain peppermint essential oil microcapsule powder.

[0044] Preparation Example of Xylitol-Menthol Co-crystal

[0045] Preparation Example 4: Accurately weigh a certain mass of xylitol and menthol (1 / 10 of xylitol) and add them to a 100mL crystallizer, then weigh an ethanol aqueous solution (5g) and add it to the crystallizer. Under 50℃~70℃, keep the speed at 200~350r / min and stir uniformly until the xylitol is completely dissolved. After the above solution becomes transparent and clear, cool it rapidly to the required temperature under continuous stirring within 2~5min, and continue stirring until the solution turns into white slurry, and then continue stirring for 1min. Take out the xylitol / menthol co-crystal paste mixture from the jacketed crystallizer, filter it with suction, and dry it to obtain the co-crystal product.

[0046] Preparation example of porous starch

[0047] Preparation Example 5: Weigh 25.009 g of extruded corn starch into a 250 mL container, add 100 mL of citric acid-disodium hydrogen phosphate buffer with a pH value of 5.0, preheat in a 50°C water bath for 10 min, add a complex enzyme accounting for 2.0% of the dry basis of starch (a. amylase 11.26 U / g, saccharifying enzyme 1590 U / g) to the system, the ratio of a. amylase to glucoamylase in the complex enzyme is 1:4, and react in a 50°C water bath at a constant temperature of 8 h. After the reaction is completed, add 5 mL of 1 mol / L NaOH to the system to terminate the reaction, then put it into a centrifuge and centrifuge it at a speed of 4500 r / min for 10 min, wash the precipitate with distilled water by centrifugation, and finally dry the precipitate at 50°C under normal pressure, crush it, and sieve it to obtain porous starch.

[0048] Example

[0049] Embodiment 1: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0050] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0051] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0052] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0053] The hydrophilic monomer is corn starch, and the addition amount of the hydrophilic monomer is 1%. The cooling masterbatch is jade powder, and the addition amount of the cooling masterbatch is 1%.

[0054] Embodiment 2: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0055] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0056] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0057] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0058] The hydrophilic monomer is corn starch, and the addition amount of the hydrophilic monomer is 5%. The cooling masterbatch is jade powder, and the addition amount of the cooling masterbatch is 3%.

[0059] Embodiment 3: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0060] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0061] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0062] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0063] The hydrophilic monomer is corn starch, and the addition amount of the hydrophilic monomer is 10%. The cooling masterbatch is jade powder, and the addition amount of the cooling masterbatch is 5%.

[0064] Embodiment 4: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0065] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0066] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0067] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0068] The hydrophilic monomer is the porous starch prepared in Preparation Example 5, and the addition amount of the hydrophilic monomer is 10%. The cooling masterbatch is selected from jade powder, and the addition amount of the cooling masterbatch is 5%.

[0069] Embodiment 5: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0070] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0071] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0072] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0073] The hydrophilic monomer includes the porous starch prepared in Preparation Example 5 and the walnut polyphenol prepared in Preparation Example 1 in a mass ratio of 1:1, and the addition amount of the hydrophilic monomer is 10%. The cooling masterbatch is selected from jade powder, and the addition amount of the cooling masterbatch is 5%.

[0074] Embodiment 6: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0075] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0076] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0077] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0078] The hydrophilic monomer includes the porous starch prepared in Preparation Example 5 and the walnut polyphenol prepared in Preparation Example 1 in equal amounts, and the amount of the hydrophilic monomer added is 10%. The cooling masterbatch is selected from the peppermint oil microcapsules prepared in Preparation Example 3, and the amount of the cooling masterbatch added is 5%.

[0079] Embodiment 7: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0080] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0081] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0082] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0083] The hydrophilic monomer includes the porous starch prepared in Preparation Example 5 and the walnut polyphenol prepared in Preparation Example 1 in equal amounts, and the amount of the hydrophilic monomer added is 10%. The cooling masterbatch is selected from xylitol, and the amount of the cooling masterbatch added is 5%.

[0084] Embodiment 8: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0085] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0086] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0087] S3. Preparation of polyester fiber: The hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber.

[0088] The hydrophilic monomer includes the porous starch prepared in Preparation Example 5 and the walnut polyphenol prepared in Preparation Example 1 in equal amounts, and the amount of the hydrophilic monomer added is 10%. The cooling masterbatch is selected from the xylitol-menthol co-crystallization product prepared in Preparation Example 4, and the amount of the cooling masterbatch added is 5%.

[0089] Embodiment 9: The present application provides a method for producing a functional polyester fiber, comprising the following steps:

[0090] S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET;

[0091] S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process;

[0092] S3. Preparation of polyester fiber: The hydrophilic PET, PBT and polycaprolactam prepared above are subjected to parallel composite spinning through a composite spinneret to obtain composite fibers, which are then treated with alkali solution to obtain polyester fibers.

[0093] The hydrophilic monomer includes the porous starch prepared in Preparation Example 5 and the walnut polyphenol prepared in Preparation Example 1 in equal amounts, and the amount of the hydrophilic monomer added is 10%. The cooling masterbatch is selected from the xylitol-menthol co-crystallization product prepared in Preparation Example 4, and the amount of the cooling masterbatch added is 5%.

[0094] Comparative Example

[0095] Comparative Example 1: This comparative example is different from Example 1 in that no hydrophilic monomer and cooling masterbatch are added in this comparative example.

[0096] Performance testing

[0097] (1) Moisture absorption and perspiration test: in accordance with GB / T21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method";

[0098] (2) Cooling performance test: In accordance with GB / T35263-2017 “Testing and evaluation of instantaneous cooling performance of textiles”, the KES-QM fabric contact cooling tester was used to test the contact cooling coefficient of polyester fiber.

[0099] Table 1 Performance test

[0100]

[0101]

[0102] Combining the performance test comparison in Table 1, we can find that:

[0103] 1. By comparing Examples 1-3 with Comparative Example 1, it can be found that the moisture absorption and perspiration performance of the polyester fibers prepared in Examples 1-3 is improved, which indicates that thermoplastic starch is used as a hydrophilic monomer in the present application, and starch and PET have good compatibility. The hydrophilic properties of thermoplastic starch are used to make the polyester fiber obtain excellent hydrophilic effect, that is, moisture absorption effect, which is beneficial to the use of polyester fiber. It is preferred to use jade powder masterbatch as the cool masterbatch. The cool properties of jade powder itself give PBT and polyester fibers a cool feeling, which improves the wearing experience of fabrics made of polyester fibers in summer.

[0104] 2. By comparing Examples 4-5 with Example 1, it can be found that the moisture absorption and perspiration performance of the polyester fiber prepared in Examples 4-5 is improved, which indicates that an inclusion compound can be formed between thermoplastic starch and walnut polyphenols in the present application, that is, thermoplastic starch can be used as a connecting material between walnut polyphenols or chestnut shell polyphenols and PET, thereby improving the bonding effect between walnut polyphenols and chestnut shell polyphenols and PET, so that the -OH groups in the polyphenols can be fully grafted into PET, so that the polyester fiber can obtain a stable and excellent moisture absorption and perspiration effect. Porous thermoplastic starch introduces a porous structure into PET, increases the pore structure in the polyester fiber, and thus further improves the moisture absorption and perspiration and breathability of the polyester fiber. Porous starch can also fully load walnut polyphenols, so that the polyester fiber obtains an excellent hydrophilic effect.

[0105] 3. By comparing Examples 6-8 with Example 1, it can be found that the cooling effect of the polyester fiber prepared in Examples 6-8 is improved, which indicates that the xylitol and peppermint oil microcapsules in the present application can make the polyester fiber obtain an excellent cooling effect. The xylitol-menthol co-crystallization product can improve the stability of menthol, and as xylitol absorbs heat after contacting sweat, it gives the skin a cooling experience, further improving the cooling experience of the polyester fiber and improving the wearing experience of the fabric.

[0106] 4. By comparing Example 9 with Example 1, it can be found that the moisture absorption and perspiration management properties of the polyester fiber prepared in Example 9 are improved. This indicates that in the present application, since polycaprolactam is an alkali-intolerant product, the composite fiber can be treated with alkali solution to dissolve the polycaprolactam, so that the polyester fiber obtains more porous structures, which is beneficial to improving the moisture absorption and perspiration management effect of the polyester fiber.

[0107] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A method for producing a functional polyester fiber, characterized in that: The following steps are involved: S1, PET preparation: PTA is pumped into a slurry tank, and ethylene glycol EG and a hydrophilic monomer are added thereto for slurry preparation, and after being fully mixed, the esterification is sent to an esterification kettle for esterification, and the prepolymer after esterification is sent to a polycondensation kettle for polycondensation to form a hydrophilic PET; S2, PBT preparation: drying and crystallizing polybutylene terephthalate PBT slices, and then adding cool masterbatch to blend during the screw melting process; S3, preparation of polyester fiber: the hydrophilic PET and PBT prepared above are subjected to parallel composite spinning through a composite spinneret to obtain polyester fiber; The hydrophilic monomer is selected from one or more of thermoplastic starch, walnut polyphenols, and chestnut shell polyphenols.

2. The method for producing a functional polyester fiber according to claim 1, characterized in that: The extraction method of walnut polyphenol is as follows: taking walnut green peel and adding it into ethanol solution, ultrasonic extraction for 30 minutes, centrifugal separation, and retaining the supernatant, which is walnut polyphenol.

3. According to the claim The method for producing a functional polyester fiber is characterized by: The preparation method of chestnut shell polyphenol is as follows: chestnut shells are removed from impurities, cleaned, air-dried, and crushed to obtain chestnut shell powder, which is then soaked in an ethanol aqueous solution in a water bath, filtered, the filtrate is retained, and evaporated to dryness to obtain chestnut shell polyphenol.

4. The method for producing a functional polyester fiber according to claim 1, characterized in that: The starch is thermoplastic starch, and the thermoplastic starch is selected from any one of corn starch, potato starch and sweet potato starch.

5. The method for producing a functional polyester fiber according to claim 1, characterized in that: The cooling masterbatch is selected from at least one of jade powder masterbatch, peppermint oil microcapsule or xylitol.

6. The method for producing a functional polyester fiber according to claim 5, characterized in that: The cooling masterbatch also includes a xylitol-menthol co-crystallization product.

7. The method for producing a functional polyester fiber according to claim 1, characterized in that: The added amount of the hydrophilic monomer is 1%-10%.

8. The method for producing a functional polyester fiber according to claim 1, characterized in that: In the step S3, the hydrophilic PET, PBT and polycaprolactam prepared above are subjected to parallel composite spinning through a composite spinneret to obtain composite fibers, which are then treated with alkali solution to obtain polyester fibers.

Images