High-moisture-absorption breathable polyester fabric and preparation method thereof

Abstract

The invention relates to the technical field of garment materials, and discloses a high-moisture-absorption breathable polyester fabric and a preparation method thereof. The preparation method of the high-moisture-absorption breathable polyester fabric comprises the following steps: mixing terephthalic acid, ethylene glycol, a modified flame-retardant comonomer and tetrabutyl titanate, and carrying out esterification and melt polycondensation to obtain modified polyester; mixing the modified polyester and the polyester master batch, and spinning to obtain the high-performance hollow polyester fiber. Blending and knitting high-performance hollow polyester fibers and cotton fibers to obtain polyester fabric; the preparation method comprises the following steps: modifying palygorskite with a silane coupling agent KH-550, and then loading phosphorus-doped carbon dots to obtain loaded modified palygorskite; the polyester fabric is soaked in the polydopamine finishing liquid and the loaded modified palygorskite aqueous dispersion liquid, and the high-moisture-absorption breathable polyester fabric is obtained. The high-moisture-absorption breathable polyester fabric not only has good moisture absorption and breathability, but also has excellent flame retardance.

Description

Technical Field

[0001] This invention relates to the field of clothing fabric technology, specifically to a highly moisture-wicking and breathable polyester fabric and its preparation method. Background Technology

[0002] Polyester fiber (trade name: polyester) is currently the most industrialized and widely used synthetic fiber on the market. Compared with other natural or chemical fibers, polyester has stronger light resistance, abrasion resistance, elasticity, and strength, making it widely used in the apparel industry. However, polyester has weak moisture absorption capacity and is a typical hydrophobic material. Therefore, when people sweat, sweat on the skin is not easily wicked away from the fabric through polyester, causing a stuffy and uncomfortable feeling. Therefore, improving the moisture absorption capacity of polyester is crucial.

[0003] For example, Chinese patent application CN107502990A discloses a highly absorbent polyester fiber, a highly absorbent fabric, and its preparation and application. This invention modifies the polyester fiber through a combination of physical, enzymatic, and chemical treatments, significantly improving its water absorption and moisture absorption properties. However, the flame retardant properties of this highly absorbent polyester fiber need improvement, making it unsuitable for applications requiring flame retardancy. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for preparing a highly moisture-wicking and breathable polyester fabric, comprising the following steps:

[0005] Step 1: Mix terephthalic acid, ethylene glycol, modified flame-retardant comonomer, and tetrabutyl titanate, esterify them first, and then melt polycondense them to obtain modified polyester.

[0006] The method for preparing the modified flame-retardant comonomer is as follows:

[0007] Step S1 involves the reaction of 2-amino-2-methyl-1,3-propanediol, 4-formylphenylboronic acid, and diethyl phosphite to obtain a ternary flame retardant; the ternary flame retardant is then reacted with acryloyl chloride to obtain a modified ternary flame retardant.

[0008] Step S2: The modified ternary flame retardant reacts with mercaptoethylamine to obtain a flame-retardant comonomer; terephthalic acid and the flame-retardant comonomer react to obtain a modified flame-retardant comonomer.

[0009] Step 2: Modified polyester and polyester masterbatch are mixed and spun to obtain high-performance hollow polyester fiber; high-performance hollow polyester fiber and cotton fiber are blended and knitted to obtain polyester fabric.

[0010] Step 3: After being modified by silane coupling agent KH-550, palygorskite is then loaded with phosphorus-doped carbon dots to obtain loaded modified palygorskite.

[0011] Step 4: The polyester fabric is soaked in a polydopamine finishing solution to obtain a polydopamine-modified polyester fabric; the polydopamine-modified polyester fabric is then soaked in a load-modified palygorskite aqueous dispersion to obtain a highly absorbent and breathable polyester fabric.

[0012] Preferably, in step one, the mass ratio of terephthalic acid, ethylene glycol, modified flame-retardant comonomer, and tetrabutyl titanate is 100:(30-50):(70-90):0.02; the esterification conditions are: esterification at 180-240℃ for 2.5-3.5h; and the melt polycondensation conditions are: melt polycondensation at 255-265℃ for 1.5-2.5h.

[0013] In the above process, a portion of ethylene glycol is replaced by a modified flame-retardant comonomer and copolymerized with terephthalic acid to obtain a modified polyester containing nitrogen, phosphorus, and boron flame-retardant elements as well as amide units.

[0014] Preferably, in step one, the preparation method of the modified ternary flame retardant in step S1 is as follows:

[0015] 2-Amino-2-methyl-1,3-propanediol and 4-formylphenylboronic acid were added to methanol and reacted at 45-55℃ for 2-4 hours. Then, diethyl phosphite was added and the reaction was continued for 1.5-2.5 hours. The ternary flame retardant was purified. The mass ratio of 2-amino-2-methyl-1,3-propanediol, 4-formylphenylboronic acid, methanol, and diethyl phosphite was (2.1-4.2):(3.1-6.2):(200-300):(2.8-5.6).

[0016] A ternary flame retardant was added to N,N-dimethylformamide, and an acryloyl chloride / N,N-dimethylformamide dispersion was added dropwise while stirring at 0°C. The reaction was first carried out at 0°C for 1.5-2.5 h, and then at 3-5°C for 3.5-4.5 h. After purification, the modified ternary flame retardant was obtained. The mass ratio of the ternary flame retardant, N,N-dimethylformamide, and acryloyl chloride / N,N-dimethylformamide dispersion was (3.8-7.6):(150-200):(10-16).

[0017] In the above process, 2-amino-2-methyl-1,3-propanediol, 4-formylphenylboronic acid, and diethyl phosphite react to obtain a ternary flame retardant containing flame-retardant nitrogen, phosphorus, and boron elements; then, one of the hydroxyl groups in the ternary flame retardant reacts with acryloyl chloride to obtain a modified ternary flame retardant containing carbon-carbon double bonds.

[0018] Preferably, in step S1, the method for preparing the modified flame-retardant comonomer in step S2 is as follows:

[0019] The modified ternary flame retardant was dispersed in ethanol, sonicated, heated to 50-60℃, and then mercaptoethylamine / water solution was added and stirred. Then azobisisobutyronitrile / ethanol solution was added and stirred at 50-60℃ for 3-5 hours. After purification, the flame-retardant comonomer was obtained. The mass ratio of the modified ternary flame retardant, ethanol, mercaptoethylamine / water solution and azobisisobutyronitrile / ethanol solution was (4-6):(100-120):(8-12):(6-10).

[0020] Terephthalic acid was added to N,N-dimethylformamide and sonicated. Then, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide were added and stirred. The flame-retardant comonomer was then added, and the pH of the mixture was adjusted to 5.5. The mixture was reacted at room temperature under a nitrogen atmosphere for 20-30 hours and purified to obtain the modified flame-retardant comonomer. The mass ratio of terephthalic acid, N,N-dimethylformamide, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, N-hydroxysuccinimide, and flame-retardant comonomer was (0.9-1.3):(100-120):(3.7-7.4):(2.1-4.2):(3-5).

[0021] In the above process, the carbon-carbon double bond of the modified ternary flame retardant reacts with the mercapto group of mercaptoethylamine to introduce an amino group, thus obtaining a flame-retardant comonomer. The amino group of the flame-retardant comonomer reacts with the carboxyl groups at both ends of terephthalic acid to obtain a modified flame-retardant comonomer containing amide bonds, hydroxyl groups, and nitrogen, phosphorus, and boron flame-retardant elements.

[0022] Preferably, in step two, the mass ratio of the modified polyester to the polyester masterbatch is (3-4):1.5; the spinning temperature is 230-250℃; the spinning adopts a spinning method using a shaped spinneret, and the shaped spinneret is a hollow spinneret.

[0023] Preferably, in step two, the mass ratio of the high-performance hollow polyester fiber to cotton fiber is 1:(0.2-0.3); the English count of the composite yarn is 30-40; and the weight of the polyester fabric is 120-150 g / m². 2 .

[0024] Preferably, in step three, the method for preparing the loaded modified palygorskite is as follows:

[0025] Palaemonite powder, silane coupling agent KH-550, and 98% ethanol aqueous solution were mixed in a mass ratio of (50-60):(4.5-8.5):(400-500), and stirred and refluxed at 75-80℃ for 20-24 h. After purification, silane-modified palaemonite was obtained.

[0026] Gelatin, water, and phosphoric acid aqueous solution were mixed in a mass ratio of 100:50:(80-90), microwaved at 260-280W for 15-25 minutes, and then microwaved at 80-100W for 30-50 minutes. After purification, phosphorus-doped carbon dots were obtained.

[0027] Silane-modified palygorskite, phosphorus-doped carbon dots, and deionized water were mixed at a mass ratio of 15:(5.3-7.3):200 and refluxed at 93-98℃ for 3.5-4.5 h. After purification, the loaded modified palygorskite was obtained.

[0028] In the above process, palygorskite was modified with silane coupling agent KH-550 to obtain silane-modified palygorskite with amino groups on its surface. Phosphorus-doped carbon dots were prepared using gelatin, water, and phosphoric acid as raw materials via microwave assistance. The surface of the phosphorus-doped carbon dots contained abundant hydrophilic hydroxyl and phosphate groups. The amino groups on the surface of the silane-modified palygorskite combined with the phosphate groups on the surface of the phosphorus-doped carbon dots, thus loading the phosphorus-doped carbon dots onto the palygorskite. The carbon dots in the polymer matrix can promote char formation and have good flame retardant effects. The phosphorus-doped carbon dots combine the advantages of both carbon dots and phosphorus-based flame retardants, exhibiting excellent flame retardant properties during combustion. It exhibits excellent flame-retardant properties during the process; palygorskite is a material with a natural fibrous form, characterized by high specific surface area, abundant surface hydroxyl groups, and microporous channels, resulting in excellent moisture absorption. Furthermore, palygorskite contains a large amount of magnesium, aluminum, and water of different properties (adsorbed water, zeolite water, bound water, structural water, etc.), which can improve the density of the formed carbon layer. The water vapor generated by thermal decomposition can also dilute the concentration of combustible gases, thus exhibiting good flame-retardant properties. The combination of phosphorus-doped carbon dots and silane-modified palygorskite significantly enhances both moisture absorption and flame-retardant properties.

[0029] Preferably, in step four, the bath ratio of the polyester fabric in the polydopamine finishing solution is 1:(10-15); the soaking conditions are: soaking at room temperature for 20-30 hours; wherein, the polydopamine finishing solution is obtained by adding dopamine hydrochloride to a Tris-HCl buffer solution with a concentration of 0.1 mol / L, and then adjusting the pH to 8.5 with a hydrochloric acid aqueous solution with a concentration of 0.1 mol / L.

[0030] In the above process, under alkaline conditions, dopamine hydrochloride polymerizes on the surface of polyester fabric to form a polydopamine layer, introducing abundant hydrophilic hydroxyl groups onto the surface of the polyester fabric, improving the moisture absorption and breathability of the polyester fabric. Furthermore, the introduction of the polydopamine layer during combustion can promote char formation and improve the flame retardant properties of the polyester fabric. In addition, as an intermediate connecting layer, the polydopamine layer improves the bonding strength and loading of the loaded modified palygorskite on the polyester fabric through its own adhesion and the formation of hydrogen bonds with the polyester fabric and the loaded modified palygorskite.

[0031] Preferably, in step four, the bath ratio of the polydopamine-modified polyester fabric in the loaded modified palygorskite aqueous dispersion is 1:(10-15); the soaking treatment conditions are: soaking treatment at room temperature for 2.5-3.5 hours; wherein the concentration of the loaded modified palygorskite aqueous dispersion is 8-10 g / L.

[0032] The high moisture-absorbing and breathable polyester fabric is prepared using the aforementioned method.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. This invention uses a modified flame-retardant comonomer containing amide bonds, hydroxyl groups, and nitrogen, phosphorus, and boron flame-retardant elements to replace part of the ethylene glycol, introducing hydrophilic amide units and flame-retardant elements into the modified polyester to give it excellent flame-retardant and moisture-wicking properties. High-performance hollow polyester fibers are then prepared using the modified polyester as raw material. The modified polyester is combined with a hollow profile structure to improve the moisture-wicking properties of the high-performance hollow polyester fibers. These high-performance hollow polyester fibers are then blended with cotton fibers, which have excellent moisture-wicking properties, to obtain a moisture-wicking and breathable polyester fabric.

[0035] 2. In this invention, polyester fabric is immersed in a polydopamine finishing solution to form a polydopamine layer on the surface of the polyester fabric, thereby improving the moisture absorption, breathability and flame retardant properties of the polyester fabric. Furthermore, the polydopamine layer, as an intermediate connecting layer, enhances the bonding strength and load of the load-modified palygorskite on the polyester fabric through its own adhesion and the formation of hydrogen bonds with the polyester fabric and the load-modified palygorskite.

[0036] 3. In this invention, modified palygorskite with phosphorus-doped carbon dots is applied to polyester fabric. The phosphorus-doped carbon dots and palygorskite work synergistically to improve the flame retardant and moisture-wicking properties of the fabric. Attached Figure Description

[0037] Figure 1 This is a schematic diagram illustrating the synthesis of the ternary flame retardant in this invention;

[0038] Figure 2 This is a comparison chart of the limiting oxygen index tests of the highly absorbent and breathable polyester fabrics prepared in Examples 2-4 and Comparative Examples 1-4 of the present invention.

[0039] Figure 3 This is a comparison chart of the moisture permeability test results of the highly absorbent and breathable polyester fabrics prepared in Examples 2-4 and Comparative Examples 1-4 of the present invention.

[0040] Figure 4 This is a comparison chart of the water absorption rate tests of the highly absorbent and breathable polyester fabrics prepared in Examples 2-4 and Comparative Examples 1-4 of the present invention. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Example 1

[0043] This embodiment discloses a method for preparing a modified flame-retardant comonomer, including the following steps:

[0044] Step S1: Add 3.2g of 2-amino-2-methyl-1,3-propanediol and 4.7g of 4-formylphenylboronic acid to 250g of methanol and react at 50℃ for 3h. Then add 4.2g of diethyl phosphite and continue to react for 2h while keeping the temperature constant. After the reaction is completed, rotary evaporate the product and wash it with ethanol and dry it to obtain a ternary flame retardant.

[0045] 5.7g of ternary flame retardant was added to 175g of N,N-dimethylformamide. 13g of 7.3wt% acryloyl chloride / N,N-dimethylformamide dispersion was added dropwise at 1mL / min while stirring at 0℃. The reaction was first carried out at 0℃ for 2h, and then at 4℃ for 4h. After the reaction was completed, the mixture was rotary evaporated. The product was washed with ethanol and dried to obtain the modified ternary flame retardant.

[0046] Step S2: Disperse 5g of modified ternary flame retardant into 110g of ethanol, sonicate at 400W for 30min, heat to 55℃, add 10g of 10% mercaptoethylamine / water solution, stir for 15min, add 8g of 0.5% azobisisobutyronitrile / ethanol solution, maintain temperature at 55℃ and stir for 4h. After the reaction is complete, centrifuge, wash and dry to obtain flame retardant comonomer;

[0047] 1.1 g of terephthalic acid was added to 110 g of N,N-dimethylformamide and ultrasonically dispersed for 30 min. Then, 5.6 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and 3.2 g of N-hydroxysuccinimide were added and stirred for 3 h. Then, 4 g of flame-retardant comonomer was added. The pH of the mixture was adjusted to 5.5 with 1 mol / L hydrochloric acid aqueous solution. The mixture was reacted at room temperature under a nitrogen atmosphere for 25 h. After the reaction was completed, rotary evaporation was performed. The product was washed with ethanol and dried to obtain the modified flame-retardant comonomer.

[0048] Example 2

[0049] This embodiment discloses a method for preparing a highly moisture-wicking and breathable polyester fabric, including the following steps:

[0050] Step 1: Terephthalic acid, ethylene glycol, modified flame-retardant comonomer, and catalyst tetrabutyl titanate are mixed in a mass ratio of 100:30:70:0.02, esterified at 180℃ for 3.5h, and then melt-condensed at 255℃ for 2.5h to obtain modified polyester.

[0051] Step 2: The modified polyester and polyester masterbatch are mixed at a mass ratio of 3:1.5 and spun at 230°C to obtain high-performance hollow polyester fibers; the spinning adopts a spinning method with a shaped spinneret, and the shaped spinneret is a hollow spinneret.

[0052] High-performance hollow polyester fiber and cotton fiber were blended at a mass ratio of 1:0.2 to obtain a composite yarn with an English count of 30. This yarn was then knitted to obtain a weight of 120 g / m². 2 Polyester fabric;

[0053] Step 3: Add 50g of palygorskite powder and 4.5g of silane coupling agent KH-550 to 400g of 98% ethanol aqueous solution, stir and reflux at 75℃ for 24h, centrifuge, wash the obtained solid product with ethanol, and vacuum dry at 40℃ to obtain silane-modified palygorskite.

[0054] Gelatin, water, and an 85% phosphoric acid aqueous solution were mixed in a mass ratio of 100:50:80. The mixture was first microwaved at 260W for 25 minutes, then microwaved at 80W for 50 minutes. Deionized water was then added, and the mixture was sonicated for 20 minutes. The pH of the solution was then adjusted to neutral by adding a 0.1mol / L sodium hydroxide aqueous solution. The insoluble matter was removed by filtration, and the solution was rotary evaporated at 80°C to obtain phosphorus-doped carbon dots.

[0055] Silane-modified palygorskite, phosphorus-doped carbon dots, and deionized water were mixed in a mass ratio of 15:5.3:200 and refluxed at 93°C for 4.5 h. The solid was collected by filtration, washed with deionized water, and dried at 90°C for 6 h to obtain supported modified palygorskite.

[0056] Step 4: Add 2g of dopamine hydrochloride to 100mL of 0.1mol / L Tris-HCl buffer solution, and adjust the pH to 8.5 with 0.1mol / L hydrochloric acid aqueous solution to obtain polydopamine finishing solution; add polyester fabric to polydopamine finishing solution at a bath ratio of 1:10, soak at room temperature for 20h, remove after soaking, wash with water, and dry to obtain polydopamine modified polyester fabric;

[0057] Loaded modified palygorskite was added to deionized water and ultrasonically treated for 20 min to obtain a loaded modified palygorskite aqueous dispersion with a concentration of 8 g / L. Polydopamine modified polyester fabric was added to the loaded modified palygorskite aqueous dispersion at a bath ratio of 1:10 and soaked at room temperature for 2.5 h. After soaking, the fabric was removed, washed with water, and dried at 70 °C to obtain a highly absorbent and breathable polyester fabric.

[0058] Example 3

[0059] This embodiment discloses a method for preparing a highly moisture-wicking and breathable polyester fabric, including the following steps:

[0060] Step 1: Terephthalic acid, ethylene glycol, modified flame-retardant comonomer, and catalyst tetrabutyl titanate are mixed in a mass ratio of 100:50:90:0.02, esterified at 240℃ for 2.5h, and then melt-condensed at 265℃ for 1.5h to obtain modified polyester.

[0061] Step 2: The modified polyester and polyester masterbatch are mixed at a mass ratio of 4:1.5 and spun at 250°C to obtain high-performance hollow polyester fibers; the spinning adopts a spinning method with a shaped spinneret, and the shaped spinneret is a hollow spinneret.

[0062] High-performance hollow polyester fiber and cotton fiber were blended at a mass ratio of 1:0.3 to obtain a composite yarn with an English count of 40. This yarn was then knitted to obtain a weight of 150 g / m². 2 Polyester fabric;

[0063] Step 3: Add 60g of palygorskite powder and 8.5g of silane coupling agent KH-550 to 500g of 98% ethanol aqueous solution, stir and reflux at 80℃ for 20h, centrifuge, wash the obtained solid product with ethanol, and vacuum dry at 40℃ to obtain silane-modified palygorskite.

[0064] Gelatin, water, and an 85% phosphoric acid aqueous solution were mixed in a mass ratio of 100:50:90. The mixture was first microwaved at 280W for 15 minutes, then microwaved at 100W for 30 minutes. Deionized water was then added, and the mixture was sonicated for 40 minutes. The pH of the solution was then adjusted to neutral by adding a 0.1mol / L sodium hydroxide aqueous solution. The insoluble matter was removed by filtration, and the solution was rotary evaporated at 85°C to obtain phosphorus-doped carbon dots.

[0065] Silane-modified palygorskite, phosphorus-doped carbon dots, and deionized water were mixed in a mass ratio of 15:7.3:200 and refluxed at 98°C for 3.5 h. The solid was collected by filtration, washed with deionized water, and dried at 100°C for 4 h to obtain supported modified palygorskite.

[0066] Step 4: Add 3g of dopamine hydrochloride to 100mL of 0.1mol / L Tris-HCl buffer solution, and adjust the pH to 8.5 with 0.1mol / L hydrochloric acid aqueous solution to obtain polydopamine finishing solution; add polyester fabric to polydopamine finishing solution at a bath ratio of 1:15, soak at room temperature for 30h, remove after soaking, wash with water, and dry to obtain polydopamine modified polyester fabric;

[0067] Loaded modified palygorskite was added to deionized water and ultrasonically treated for 40 min to obtain a 10 g / L aqueous dispersion of loaded modified palygorskite. Polydopamine-modified polyester fabric was added to the aqueous dispersion of loaded modified palygorskite at a bath ratio of 1:15 and soaked at room temperature for 3.5 h. After soaking, the fabric was removed, washed with water, and dried at 80 °C to obtain a highly absorbent and breathable polyester fabric.

[0068] Example 4

[0069] This embodiment discloses a method for preparing a highly moisture-wicking and breathable polyester fabric, including the following steps:

[0070] Step 1: Terephthalic acid, ethylene glycol, modified flame-retardant comonomer, and catalyst tetrabutyl titanate are mixed in a mass ratio of 100:40:80:0.02, esterified at 210℃ for 3 hours, and then melt-condensed at 260℃ for 2 hours to obtain modified polyester.

[0071] Step 2: The modified polyester and polyester masterbatch are mixed at a mass ratio of 3.5:1.5 and spun at 240°C to obtain high-performance hollow polyester fibers; the spinning adopts a spinning method with a shaped spinneret, and the shaped spinneret is a hollow spinneret.

[0072] High-performance hollow polyester fiber and cotton fiber were blended at a mass ratio of 1:0.25 to obtain a composite yarn with an English count of 35. This yarn was then knitted to obtain a weight of 135 g / m². 2 Polyester fabric;

[0073] Step 3: Add 55g of palygorskite powder and 6.5g of silane coupling agent KH-550 to 450g of 98% ethanol aqueous solution, stir and reflux at 78℃ for 22h, centrifuge, wash the obtained solid product with ethanol, and vacuum dry at 40℃ to obtain silane-modified palygorskite.

[0074] Gelatin, water, and an 85% phosphoric acid aqueous solution were mixed in a mass ratio of 100:50:85. The mixture was first microwaved at 270W for 20 minutes, then microwaved at 90W for 40 minutes. Deionized water was then added, and the mixture was sonicated for 30 minutes. The pH of the solution was then adjusted to neutral by adding a 0.1mol / L sodium hydroxide aqueous solution. The insoluble matter was removed by filtration, and the solution was rotary evaporated at 82°C to obtain phosphorus-doped carbon dots.

[0075] Silane-modified palygorskite, phosphorus-doped carbon dots, and deionized water were mixed in a mass ratio of 15:6.3:200 and refluxed at 95°C for 4 hours. The solid was collected by filtration, washed with deionized water, and dried at 95°C for 5 hours to obtain loaded modified palygorskite.

[0076] Step 4: Add 2.5g of dopamine hydrochloride to 100mL of 0.1mol / L Tris-HCl buffer solution, and adjust the pH to 8.5 with 0.1mol / L hydrochloric acid aqueous solution to obtain polydopamine finishing solution; add polyester fabric to polydopamine finishing solution at a bath ratio of 1:12.5, and soak at room temperature for 25h. After soaking, remove, wash with water, and dry to obtain polydopamine modified polyester fabric.

[0077] Loaded modified palygorskite was added to deionized water and ultrasonically treated for 30 min to obtain a 9 g / L aqueous dispersion of loaded modified palygorskite. Polydopamine-modified polyester fabric was added to the aqueous dispersion of loaded modified palygorskite at a bath ratio of 1:12.5 and soaked at room temperature for 3 h. After soaking, the fabric was removed, washed with water, and dried at 75 °C to obtain a highly absorbent and breathable polyester fabric.

[0078] The modified flame-retardant comonomers in Examples 2-4 above are the modified flame-retardant comonomers prepared in Example 1.

[0079] Comparative Example 1

[0080] Compared with Example 4, Comparative Example 1 used an equal amount of polyester masterbatch to replace the modified polyester in the process of preparing high-performance hollow polyester fiber, while keeping other conditions unchanged.

[0081] Comparative Example 2

[0082] Compared with Example 4, Comparative Example 2 used an equal amount of silane-modified palygorskite instead of the loaded palygorskite in the preparation of the loaded modified palygorskite aqueous dispersion, while other conditions remained unchanged.

[0083] Comparative Example 3

[0084] Compared with Example 4, Comparative Example 3 was not soaked in the loaded modified palygorskite aqueous dispersion during the preparation of the high moisture-wicking and breathable polyester fabric. That is, the polydopamine modified polyester fabric in Comparative Example 3 is the final product - high moisture-wicking and breathable polyester fabric, and all other conditions remain unchanged.

[0085] Comparative Example 4

[0086] Compared with Example 4, in the process of preparing the highly absorbent and breathable polyester fabric, the polyester fabric in Comparative Example 4 was not soaked in polydopamine finishing solution. That is, in Comparative Example 4, the polyester fabric was added to the loaded modified palygorskite aqueous dispersion and soaked at room temperature for 3 hours to prepare the highly absorbent and breathable polyester fabric, while other conditions remained unchanged.

[0087] In the above examples and comparative examples, the polyester masterbatch, with a heat resistance temperature of 200-350℃, was provided by Dongguan Puris Plastic Raw Materials Co., Ltd.; the Tris-HCl buffer solution, with a concentration of 0.1mol / L and model number T17419.500, was from Shanghai Shangbao Biotechnology Co., Ltd.; and the palygorskite powder, with a density of 2.05-2.32g / cm3 and a mesh size of 150-800 mesh, was pulverized for 15 seconds before use and was from Shandong Guohua Chemical Co., Ltd.

[0088] Experimental Example

[0089] The performance of the highly absorbent and breathable polyester fabrics prepared in Examples 2-4 and Comparative Examples 1-4 was tested.

[0090] I. Flame retardant performance test: The limiting oxygen index is tested using an oxygen index instrument in accordance with the international standard GB / T 2406.1-2008.

[0091] II. Moisture absorption and breathability test: The water absorption rate and moisture permeability are tested according to the international standard GB / T 21655.1-2008.

[0092] The test results are shown in Table 1:

[0093] Table 1

[0094] Limiting oxygen index / % <![CDATA[Water vapor transmission rate / (g / m 2 d)]]> Water absorption rate / % Example 2 36.07 11972 271 Example 3 37.21 12114 283 Example 4 36.53 12015 276 Comparative Example 1 34.04 10680 242 Comparative Example 2 35.12 11931 268 Comparative Example 3 34.58 10266 235 Comparative Example 4 35.95 11918 259

[0095] As can be seen from the test results in Table 1, the highly absorbent and breathable polyester fabrics prepared in Examples 2-4 of this invention have excellent moisture absorption and breathability as well as flame retardant properties. The comparison between Comparative Example 1 and Example 4 shows that introducing hydrophilic amide units and flame-retardant elements into the modified polyester gives it excellent flame-retardant and moisture-wicking properties, thereby improving the fabric's flame-retardant and moisture-wicking properties. The comparison between Comparative Example 2 and Example 4 shows that phosphorus-doped carbon dots contain hydrophilic groups and combine the advantages of carbon dots and phosphorus-based flame retardants, positively impacting the fabric's flame-retardant and moisture-wicking properties. The comparison between Comparative Example 3 and Example 4 shows that the combination of phosphorus-doped carbon dots and silane-modified palygorskite significantly affects the fabric's moisture-wicking and flame-retardant properties. The comparison between Comparative Example 4 and Example 4 shows that forming a polydopamine layer on the surface of the polyester fabric improves its moisture-wicking, breathability, and flame-retardant properties. Furthermore, the polydopamine layer, as an intermediate connecting layer, enhances the bonding strength and loading capacity of the modified palygorskite on the polyester fabric, thereby improving the fabric's performance.

[0096] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a highly moisture-wicking and breathable polyester fabric, characterized in that, Includes the following steps: Step 1: Mix terephthalic acid, ethylene glycol, modified flame-retardant comonomer, and tetrabutyl titanate, esterify them first, and then melt polycondense them to obtain modified polyester. The method for preparing the modified flame-retardant comonomer is as follows: Step S1 involves the reaction of 2-amino-2-methyl-1,3-propanediol, 4-formylphenylboronic acid, and diethyl phosphite to obtain a ternary flame retardant; the ternary flame retardant is then reacted with acryloyl chloride to obtain a modified ternary flame retardant. Step S2: The modified ternary flame retardant reacts with mercaptoethylamine to obtain a flame-retardant comonomer; terephthalic acid and the flame-retardant comonomer react to obtain a modified flame-retardant comonomer. Step 2: Mix the modified polyester and polyester masterbatch, spin the mixture to obtain high-performance hollow polyester fiber; blend the high-performance hollow polyester fiber with cotton fiber, knit the mixture to obtain polyester fabric. Step 3: After being modified by silane coupling agent KH-550, palygorskite is then loaded with phosphorus-doped carbon dots to obtain loaded modified palygorskite. Step 4: The polyester fabric is soaked in a polydopamine finishing solution to obtain a polydopamine-modified polyester fabric; the polydopamine-modified polyester fabric is then soaked in a load-modified palygorskite aqueous dispersion to obtain a highly absorbent and breathable polyester fabric.

2. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step one, the mass ratio of terephthalic acid, ethylene glycol, modified flame-retardant comonomer, and tetrabutyl titanate is 100:(30-50):(70-90):0.02; the esterification conditions are: esterification at 180-240℃ for 2.5-3.5h; the melt polycondensation conditions are: melt polycondensation at 255-265℃ for 1.5-2.5h.

3. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step one, in step S1, the preparation method of the modified ternary flame retardant is as follows: 2-Amino-2-methyl-1,3-propanediol and 4-formylphenylboronic acid were added to methanol and reacted at 45-55℃ for 2-4 hours. Then, diethyl phosphite was added and the reaction was continued for 1.5-2.5 hours. The ternary flame retardant was purified. The mass ratio of 2-amino-2-methyl-1,3-propanediol, 4-formylphenylboronic acid, methanol, and diethyl phosphite was (2.1-4.2):(3.1-6.2):(200-300):(2.8-5.6). The ternary flame retardant was added to N,N-dimethylformamide, and an acryloyl chloride / N,N-dimethylformamide dispersion was added dropwise while stirring at 0°C. The reaction was first carried out at 0°C for 1.5-2.5 h, and then at 3-5°C for 3.5-4.5 h. After purification, the modified ternary flame retardant was obtained. The mass ratio of the ternary flame retardant, N,N-dimethylformamide, and acryloyl chloride / N,N-dimethylformamide dispersion was (3.8-7.6):(150-200):(10-16).

4. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step S1, the method for preparing the modified flame-retardant comonomer in step S2 is as follows: The modified ternary flame retardant was dispersed in ethanol, sonicated, heated to 50-60℃, and then mercaptoethylamine / water solution was added and stirred. Then azobisisobutyronitrile / ethanol solution was added and stirred at 50-60℃ for 3-5 hours. After purification, the flame-retardant comonomer was obtained. The mass ratio of the modified ternary flame retardant, ethanol, mercaptoethylamine / water solution and azobisisobutyronitrile / ethanol solution was (4-6):(100-120):(8-12):(6-10). Terephthalic acid was added to N,N-dimethylformamide and sonicated. Then, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide were added and stirred. The flame-retardant comonomer was then added, and the pH of the mixture was adjusted to 5.

5. The mixture was reacted at room temperature under a nitrogen atmosphere for 20-30 hours and purified to obtain the modified flame-retardant comonomer. The mass ratio of terephthalic acid, N,N-dimethylformamide, 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride, N-hydroxysuccinimide, and flame-retardant comonomer was (0.9-1.3):(100-120):(3.7-7.4):(2.1-4.2):(3-5).

5. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step two, the mass ratio of the modified polyester to the polyester masterbatch is (3-4):1.5; the spinning temperature is 230-250℃; the spinning adopts a spinning method using a shaped spinneret, and the shaped spinneret is a hollow spinneret.

6. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step two, the mass ratio of the high-performance hollow polyester fiber to cotton fiber is 1:(0.2-0.3); the English count of the composite yarn is 30-40; and the weight of the polyester fabric is 120-150 g / m². 2 .

7. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step three, the method for preparing the load-modified palygorskite is as follows: Palaemonite powder, silane coupling agent KH-550, and 98% ethanol aqueous solution were mixed in a mass ratio of (50-60):(4.5-8.5):(400-500), and stirred and refluxed at 75-80℃ for 20-24 h. After purification, silane-modified palaemonite was obtained. Gelatin, water, and phosphoric acid aqueous solution were mixed in a mass ratio of 100:50:(80-90), microwaved at 260-280W for 15-25 minutes, and then microwaved at 80-100W for 30-50 minutes. After purification, phosphorus-doped carbon dots were obtained. Silane-modified palygorskite, phosphorus-doped carbon dots, and deionized water were mixed at a mass ratio of 15:(5.3-7.3):200 and refluxed at 93-98℃ for 3.5-4.5 h. After purification, the loaded modified palygorskite was obtained.

8. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step four, the bath ratio of the polyester fabric in the polydopamine finishing solution is 1:(10-15); the soaking conditions are: soaking at room temperature for 20-30 hours; wherein, the polydopamine finishing solution is obtained by adding dopamine hydrochloride to a Tris-HCl buffer solution with a concentration of 0.1 mol / L, and then adjusting the pH to 8.5 with a hydrochloric acid aqueous solution with a concentration of 0.1 mol / L.

9. The method for preparing the highly absorbent and breathable polyester fabric according to claim 1, characterized in that, In step four, the bath ratio of the polydopamine-modified polyester fabric in the loaded modified palygorskite aqueous dispersion is 1:(10-15); the soaking treatment conditions are: soaking treatment at room temperature for 2.5-3.5 hours; wherein the concentration of the loaded modified palygorskite aqueous dispersion is 8-10 g / L.

10. A highly moisture-wicking and breathable polyester fabric prepared by the method for preparing highly moisture-wicking and breathable polyester fabric as described in any one of claims 1-9.

Images