Preparation method of antibacterial polyester staple fiber

Abstract

The invention belongs to the field of polyester fibers, and particularly relates to a preparation method of antibacterial polyester staple fibers, which comprises the following steps: adding ethylene glycol, terephthalic acid, an antibacterial modifier and a dispersing agent into a reaction kettle, uniformly stirring, then adding a catalyst, carrying out esterification reaction and polycondensation reaction to obtain polyester, and carrying out extrusion granulation and drying on the polyester to obtain the antibacterial polyester staple fibers. The antibacterial polyester master batch is obtained; taking antibacterial polyester master batches and polyester chips as raw materials, and performing vacuum drying to obtain a mixed spinning raw material; the mixed spinning raw materials enter a twin-screw to form a melt, the melt is uniformly extruded, then the melt is quantitatively conveyed into a spinning assembly through a metering pump, finally, the melt is extruded from a spinneret plate to form filaments, and after cooling, the filaments are oiled through an oil roller, wound and cut off to obtain the antibacterial polyester staple fibers. The polyester staple fiber prepared by the invention has excellent antibacterial performance and washable performance.

Description

Technical Field

[0001] The invention belongs to the field of polyester fibers, and in particular relates to a method for preparing antibacterial polyester staple fibers. Background Art

[0002] Polyethylene terephthalate (PET) fiber has excellent comprehensive properties: good elastic recovery performance, high strength modulus, good dimensional stability, excellent wear resistance, etc., and is widely used as clothing textile fiber raw material. The porous structure of general PET fiber and its fabric makes it easy for microorganisms to attach, leading to the spread of pathogenic bacteria, and also makes the fiber and its fabric brittle and deteriorated, affecting the performance; during use, it is easy to absorb sweat, sebum, and epidermal dandruff produced by human metabolism, providing sufficient nutrients for the growth of microorganisms, producing odor and affecting comfort. Therefore, the antibacterial modification of PET has a good development prospect.

[0003] At present, the commonly used antimicrobial agents can be divided into organic antimicrobial agents and inorganic antimicrobial agents according to their chemical composition. Inorganic antimicrobial agents have attracted attention due to their advantages such as high heat resistance, stability, broad antimicrobial spectrum, and low resistance to drug resistance. However, they have disadvantages such as high cost, poor compatibility, and poor washability. Organic antimicrobial agents can be further divided into natural antimicrobial agents and synthetic antimicrobial agents according to their sources: natural antimicrobial agents are the earliest antimicrobial agents used by humans, most of which are extracted from animals and plants, such as tea polyphenols, chitin, chitosan, etc.; while organic synthetic antimicrobial agents mainly include quaternary ammonium salts, isothiazoles, aldehyde compounds, etc.

[0004] CN201310742904.7 discloses an antibacterial polyester staple fiber and a preparation method thereof: the antibacterial polyester staple fiber is prepared by esterification polymerization spinning from micron-level heat-storage antibacterial ceramic powder and silver-loaded nano-titanium dioxide composite antibacterial powder, and the antibacterial polyester staple fiber obtained after spinning has a strong antibacterial effect against Staphylococcus aureus and Escherichia coli.

[0005] Patent CN201811002692.8 discloses a composite antibacterial polyester staple fiber and a preparation method thereof: using disodium propylenediaminetetraacetic acid as a chelating agent, copper, zinc and calcium ions are gradually boiled and coated to form a composite antibacterial agent, and then a composite antibacterial polyester masterbatch initial product is prepared by a melt blending method, and the composite antibacterial polyester masterbatch initial product is prepared by liquid phase viscosity enhancement to obtain a composite antibacterial polyester masterbatch; the composite antibacterial polyester masterbatch is melt-blended and spun with recycled polyester chips to obtain a composite antibacterial polyester staple fiber with good antibacterial ability.

[0006] However, most of the existing technologies currently use composite antibacterial agents, which have complex synthesis processes, high costs, and problems such as poor antibacterial effect and poor washability. Based on this, it is urgent to develop a polyester staple fiber with good antibacterial properties and water resistance. Summary of the invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for preparing antibacterial polyester staple fibers to solve the problems existing in the prior art such as high cost, poor antibacterial effect, and poor washability.

[0008] The present invention is achieved through the following technical solutions:

[0009] A method for preparing antibacterial polyester staple fibers comprises the following steps:

[0010] Step 1: Preparation of antibacterial polyester masterbatch

[0011] Ethylene glycol, terephthalic acid, an antibacterial modifier and a dispersant are added into a reaction kettle and stirred evenly, and then a catalyst is added to obtain polyester through esterification reaction and polycondensation reaction. The polyester is extruded, granulated and dried to obtain an antibacterial polyester masterbatch;

[0012] Step 2: Preparation of antibacterial polyester staple fiber

[0013] The antibacterial polyester masterbatch and polyester chips obtained in step 1 are used as raw materials, and vacuum drying is performed to obtain a mixed spinning raw material; the mixed spinning raw material enters a twin-screw to form a melt for uniform extrusion, and then the melt is quantitatively transported to a spinning assembly through a metering pump, and finally extruded from a spinneret to form a filament, which is then oiled by an oil roller, wound, and cut to obtain an antibacterial polyester staple fiber after cooling;

[0014] Wherein, the structure of the antibacterial modifier in step 1 is:

[0015] In some embodiments, the dispersant in step 1 is selected from one or more of sodium hexametaphosphate, white oil, zinc stearate, polyethylene wax, stearic acid, paraffin and ethylene bisstearamide.

[0016] In some embodiments, the catalyst in step 1 is selected from one or more of zinc acetate, cobalt acetate, Sb2O3 and manganese acetate.

[0017] In some embodiments, the molar ratio of terephthalic acid to ethylene glycol in step 1 is 1:(1.1-1.5); the molar ratio of terephthalic acid to antibacterial modifier is 1:(0.1-0.5); the amount of catalyst used is (0.1-0.5) wt% of the mass of terephthalic acid; the esterification reaction temperature is 200-250°C, and the esterification pressure is 0.1-0.5 MPa; the polycondensation reaction temperature is 200-250°C, and the polycondensation pressure is 70-120 Pa.

[0018] In some embodiments, the intrinsic viscosity of the polyester chips in step 2 is 0.5 to 0.8 dL / g.

[0019] In some embodiments, the mass ratio of the antibacterial polyester masterbatch to the polyester chips in step 2 is (1-10):(99-90).

[0020] In some embodiments, the screw temperature of step 2 is: 250-280°C in zone 1, 270-300°C in zone 2, 280-290°C in zone 3, and 280-290°C in zone 4; metering pump temperature: 280-290°C; spinning box temperature: 280-290°C; spinning speed: 400-800 m / min.

[0021] The present invention has achieved the following beneficial effects:

[0022] 1) The polyester staple fiber prepared by the present invention has excellent antibacterial properties against Escherichia coli and Staphylococcus aureus, and the antibacterial rate against Staphylococcus aureus and Enterobacter can reach more than 99%.

[0023] 2) Antibacterial modifier prepared by the present invention It contains triazole groups and can exert strong antibacterial effects. The two carboxyl groups in the antibacterial modifier can be polymerized with ethylene glycol to embed the triazole groups into the polyester staple fibers. The polyester staple fibers can still maintain high antibacterial activity after 50 washes and have good wash resistance. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The endpoints and any values ​​of the scope described in the present invention are not limited to the precise scope or value, and these scopes or values ​​should be understood to include values ​​close to these scopes or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be considered as specifically disclosed in this article.

[0026] Preparation of antimicrobial modifier:

[0027]

[0028] Compound I (11.1 g, 0.1 mol), ethyl acetoacetate (Compound II, 26.0 mL, 0.2 mol), and ethanol (100 mL) were added to the reactor and mixed evenly. Hexahydropyridine solution (5 mL) was slowly added dropwise to the mixture under stirring at room temperature, and the mixture was stirred for 12 h. After the reaction, the mixture was filtered, and the filter cake was washed three times with anhydrous ethanol to obtain the intermediate compound, which was directly used in the next step without further purification.

[0029] The above intermediate compound was added to a 50% NaOH aqueous solution (100 mL), heated to 50°C and stirred for 3 hours. After the reaction, it was cooled to room temperature, and the reaction solution was adjusted to pH = 2 with concentrated hydrochloric acid under an ice-water bath to precipitate solids. The filter cake was washed with water until the pH of the washing solution was 6, and the solid was recrystallized with ethyl acetate to obtain 19.4 g of a white solid antibacterial modifier, with a total yield of 91.1%.

[0030] LC-MS (ESI): [M+H] + =214.1.

[0031] 1 H-NMR (400MHz, CDCl3): δ (ppm): 11.51 (s, 2H), 8.75 (s, 1H), 8.04 (s, 1H), 3.90-3.82 (m, 1H), 3.62 (dd, 2H), 2.81 (dd, 2H), 2.67 (dd, 2H).

[0032] Example 1

[0033] A method for preparing antibacterial polyester staple fibers comprises the following steps:

[0034] Step 1: Preparation of antibacterial polyester masterbatch

[0035] Ethylene glycol, terephthalic acid, antimicrobial modifier The dispersant zinc stearate was added into the reaction kettle and stirred evenly, and then the catalyst zinc acetate was added to obtain polyester (with a characteristic viscosity of 0.5 dL / g) through esterification reaction and polycondensation reaction. The polyester was extruded, granulated and dried to obtain the antibacterial polyester masterbatch.

[0036] Among them, the molar ratio of terephthalic acid, ethylene glycol and antibacterial modifier is 1:1.3:0.3; the amount of catalyst used is 0.2wt% of the mass of terephthalic acid; the esterification reaction temperature is 230°C, the esterification pressure is 0.3MPa, the polycondensation reaction temperature is 250°C, and the polycondensation pressure is a vacuum degree of 100Pa.

[0037] Extrusion granulation screw temperature: zone 1 220℃, zone 2 230℃, zone 3 230℃, zone 4 250℃, zone 5 260℃.

[0038] Step 2: Preparation of antibacterial polyester staple fiber

[0039] The antibacterial polyester masterbatch obtained in step 1 and polyester chips (with a characteristic viscosity of 0.67 dL / g, purchased from Suzhou Polydi New Materials Technology Co., Ltd.) are used as raw materials. The mass proportions of the antibacterial polyester masterbatch and the polyester chips are 10 parts of the antibacterial polyester masterbatch and 90 parts of the polyester chips, respectively. The mixed spinning raw materials are obtained by vacuum drying.

[0040] The mixed spinning raw materials enter the twin screws to form a melt for uniform extrusion, and then the melt is quantitatively transported to the spinning assembly through a metering pump, and finally extruded from the spinneret to form filaments, which are then oiled by an oil roller, wound, and cut to obtain antibacterial polyester staple fibers after cooling.

[0041] Among them, the vacuum degree of the vacuum dryer is -0.1MPa, the rotation speed is 10r / min, the drying temperature is 100℃, and the drying time is 12h; the screw temperature is: 270℃ for zone 1, 290℃ for zone 2, 288℃ for zone 3, and 285℃ for zone 4; the metering pump temperature is 285℃; the spinning box body temperature is 288℃; the number of spinneret holes is 36 holes; the spinning speed is 600m / min.

[0042] Example 2

[0043] A method for preparing antibacterial polyester staple fibers comprises the following steps:

[0044] Step 1: Preparation of antibacterial polyester masterbatch

[0045] Ethylene glycol, terephthalic acid, antimicrobial modifier The dispersant sodium hexametaphosphate was added into the reaction kettle and stirred evenly, and then the catalyst Sb2O3 was added to obtain polyester (with a characteristic viscosity of 0.6 dL / g) through esterification reaction and polycondensation reaction. The above polyester was extruded, granulated and dried to obtain antibacterial polyester masterbatch.

[0046] Among them, the molar ratio of terephthalic acid, ethylene glycol and antibacterial modifier is 1:1.2:0.2; the amount of catalyst used is 0.15wt% of the mass of terephthalic acid; the esterification reaction temperature is 220°C, the esterification pressure is 0.4MPa, the condensation reaction temperature is 230°C, and the condensation pressure is a vacuum degree of 80Pa.

[0047] Extrusion granulation screw temperature: zone 1 220℃, zone 2 230℃, zone 3 230℃, zone 4 250℃, zone 5 260℃.

[0048] Step 2: Preparation of antibacterial polyester staple fiber

[0049] The antibacterial polyester masterbatch obtained in step 1 and polyester chips (with a characteristic viscosity of 0.67 dL / g, purchased from Suzhou Polydi New Materials Technology Co., Ltd.) are used as raw materials. The mass proportions of the antibacterial polyester masterbatch and the polyester chips are 5 parts of the antibacterial polyester masterbatch and 95 parts of the polyester chips, respectively. Vacuum drying is performed to obtain a mixed spinning raw material.

[0050] The mixed spinning raw materials enter the twin screws to form a melt for uniform extrusion, and then the melt is quantitatively transported to the spinning assembly through a metering pump, and finally extruded from the spinneret to form filaments, which are then oiled by an oil roller, wound, and cut to obtain antibacterial polyester staple fibers after cooling.

[0051] Among them, the vacuum degree of the vacuum dryer is -0.1MPa, the rotation speed is 10r / min, the drying temperature is 100℃, and the drying time is 12h; the screw temperature is: 270℃ for zone 1, 290℃ for zone 2, 288℃ for zone 3, and 285℃ for zone 4; the metering pump temperature is 285℃; the spinning box body temperature is 288℃; the number of spinneret holes is 36 holes; the spinning speed is 600m / min.

[0052] Example 3

[0053] A method for preparing antibacterial polyester staple fibers comprises the following steps:

[0054] Step 1: Preparation of antibacterial polyester masterbatch

[0055] Ethylene glycol, terephthalic acid, antimicrobial modifier The dispersant white oil is added into the reaction kettle and stirred evenly, and then the catalyst cobalt acetate is added to obtain polyester (with a characteristic viscosity of 0.7 dL / g) through esterification reaction and polycondensation reaction. The above polyester is extruded, granulated and dried to obtain the antibacterial polyester masterbatch.

[0056] Among them, the molar ratio of terephthalic acid, ethylene glycol and antibacterial modifier is 1:1.25:0.25; the amount of catalyst used is 0.2wt% of the mass of terephthalic acid; the esterification reaction temperature is 220°C, the esterification pressure is 0.3MPa, the polycondensation reaction temperature is 250°C, and the polycondensation pressure is a vacuum degree of 100Pa.

[0057] Extrusion granulation screw temperature: zone 1 220℃, zone 2 230℃, zone 3 230℃, zone 4 250℃, zone 5 260℃.

[0058] Step 2: Preparation of antibacterial polyester staple fiber

[0059] The antibacterial polyester masterbatch obtained in step 1 and polyester chips (with a characteristic viscosity of 0.67 dL / g, purchased from Suzhou Polydi New Materials Technology Co., Ltd.) are used as raw materials. The mass proportions of the antibacterial polyester masterbatch and the polyester chips are 8 parts of the antibacterial polyester masterbatch and 92 parts of the polyester chips, respectively. The mixed spinning raw materials are obtained by vacuum drying.

[0060] The mixed spinning raw materials enter the twin screws to form a melt for uniform extrusion, and then the melt is quantitatively transported to the spinning assembly through a metering pump, and finally extruded from the spinneret to form filaments, which are then oiled by an oil roller, wound, and cut to obtain antibacterial polyester staple fibers after cooling.

[0061] Among them, the vacuum degree of the vacuum dryer is -0.1MPa, the rotation speed is 10r / min, the drying temperature is 100℃, and the drying time is 12h; the screw temperature is: 270℃ for zone 1, 290℃ for zone 2, 288℃ for zone 3, and 285℃ for zone 4; the metering pump temperature is 285℃; the spinning box body temperature is 288℃; the number of spinneret holes is 36 holes; the spinning speed is 600m / min.

[0062] Comparative Example 1

[0063] On the basis of Example 1, the antibacterial modifier Replacing with the common antibacterial agent TiO2 includes the following steps:

[0064] Step 1: Preparation of antibacterial polyester masterbatch

[0065] Ethylene glycol, terephthalic acid, antibacterial modifier TiO2, and dispersant zinc stearate are added to a reaction kettle and stirred evenly, and then a catalyst zinc acetate is added to obtain polyester (with a characteristic viscosity of 0.41 dL / g) through esterification reaction and polycondensation reaction. The above polyester is extruded, granulated, and dried to obtain an antibacterial polyester masterbatch.

[0066] Among them, the molar ratio of terephthalic acid, ethylene glycol and antibacterial modifier is 1:1.3:0.3; the amount of catalyst used is 0.2wt% of the mass of terephthalic acid; the esterification reaction temperature is 230°C, the esterification pressure is 0.3MPa, the polycondensation reaction temperature is 250°C, and the polycondensation pressure is a vacuum degree of 100Pa.

[0067] Extrusion granulation screw temperature: zone 1 220℃, zone 2 230℃, zone 3 230℃, zone 4 250℃, zone 5 260℃.

[0068] Step 2: Preparation of antibacterial polyester staple fiber

[0069] The antibacterial polyester masterbatch obtained in step 1 and polyester chips (with a characteristic viscosity of 0.67 dL / g, purchased from Suzhou Polydi New Materials Technology Co., Ltd.) are used as raw materials. The mass proportions of the antibacterial polyester masterbatch and the polyester chips are 10 parts of the antibacterial polyester masterbatch and 90 parts of the polyester chips, respectively. The mixed spinning raw materials are obtained by vacuum drying.

[0070] The mixed spinning raw materials enter the twin screws to form a melt for uniform extrusion, and then the melt is quantitatively transported to the spinning assembly through a metering pump, and finally extruded from the spinneret to form filaments, which are then oiled by an oil roller, wound, and cut to obtain antibacterial polyester staple fibers after cooling.

[0071] Among them, the vacuum degree of the vacuum dryer is -0.1MPa, the rotation speed is 10r / min, the drying temperature is 100℃, and the drying time is 12h; the screw temperature is: 270℃ for zone 1, 290℃ for zone 2, 288℃ for zone 3, and 285℃ for zone 4; the metering pump temperature is 285℃; the spinning box body temperature is 288℃; the number of spinneret holes is 36 holes; the spinning speed is 600m / min.

[0072] Antibacterial performance test:

[0073] According to the national standard GB / T 20944.3-2008, the polyester staple fibers prepared in Examples 1-3 and Comparative Example 1 were subjected to antibacterial tests, and the specific operation steps are as follows:

[0074] (1) Sample preparation: Weigh 0.5 g of polyester staple fiber sample, use ultrapure water to remove the oil on the surface of the sample, dry it, put it in an autoclave at 120°C, sterilize it for 20 min, and then test it;

[0075] (2) Preparation of nutrient solution: The main components of liquid nutrient solution are tryptone, beef extract and sodium chloride, with a mass ratio of 1.5%, 0.5% and 0.5% respectively. To prepare solid nutrient solution, 1.5% agar needs to be added, and finally 1.0 mol / L sodium hydroxide solution is added to adjust the pH to 7.2;

[0076] (3) Preparation of sterile PBS: weigh 0.8 g of sodium chloride, 0.2 g of potassium chloride, 3.58 g of disodium hydrogen phosphate, and 0.24 g of potassium dihydrogen phosphate, and make up to 1 L;

[0077] (4) High temperature sterilization: Place the culture dish, nutrient medium, pipette, test tube, etc. in a high pressure sterilizer at 120°C for 20 minutes, then take it out and place it on a clean operating table;

[0078] (5) Preparation of bacterial solution: Use an inoculation loop to pick up a loop of test bacteria (Staphylococcus aureus (S. aureus, ATCC6538), Escherichia coli (E. coli, ATCC11229)), add 10 ml of liquid nutrient medium, and culture in a constant temperature shaking incubator at 37°C and 120 rpm for 18 h. Then use the 10-fold dilution method to dilute the bacterial solution to an appropriate concentration for later use;

[0079] (6) Preparation of sterile culture dishes: Use a pipette to transfer 15-20 ml of autoclaved hot nutrient solution containing agar into a sterile culture dish in a sterile operating table. After the agar solidifies, seal the dish with sealing glue and set aside for later use.

[0080] (7) Sample bottle configuration: prepare several clean 250 ml conical flasks, inject 75 ml of PBS buffer solution into each conical flask, add 0.5 g of sterilized polyester staple fiber sample into each conical flask except the blank sample bottle, and finally inject 1 ml of the prepared test bacterial solution into each conical flask;

[0081] (8) Oscillating culture: Place the prepared sample bottle in a constant temperature shaking incubator, culture at 37°C and 120 rpm for 18 h, then take out and measure the viable bacteria concentration in the sample bottle;

[0082] (9) Determination of live bacterial concentration in sample bottles: Use a pipette to transfer the bacterial solution from each sample bottle, dilute the bacterial solution to an appropriate concentration using the ten-fold dilution method, and then use a pipette to transfer 100 μL of the test bacterial solution into the above-mentioned sterile culture dish. Use a coating rod to evenly spread the solution up and down, left and right, and then place the culture dish in a constant temperature incubator at 37°C for 18 h.

[0083] (10) Calculation of antibacterial rate and evaluation of antibacterial effect: Take out the culture dish, count the colonies in the culture dish and calculate the antibacterial effect according to the formula

[0084] W=N×R

[0085] Calculate the inhibition rate. Where W represents the viable bacterial concentration in the sample bottle (CFU / ml), N represents the number of colonies, and R represents the dilution multiple; W0 and W represent the viable bacterial concentrations of the blank sample and the sample, respectively, and K represents the inhibition rate.

[0086] Standard washing method: The polyester staple fibers were washed in a household washing machine at 40°C with a standard detergent dosage of 2 g / L, for 5 minutes per wash, and dried in a 60°C oven, for a total of 50 washes. The same group of experiments were tested 5 times and the average value was taken.

[0087] Table 1 Antibacterial performance test

[0088]

[0089] As shown in Table 1, the polyester staple fibers prepared in Examples 1-3 have excellent antibacterial properties against Escherichia coli and Staphylococcus aureus, and the antibacterial rates against Staphylococcus aureus and Enterobacter can reach more than 99%. In addition, after 50 washes, the antibacterial polyester fabric still maintains a high antibacterial activity and has good wash resistance.

[0090] The above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A method for preparing an antibacterial polyester staple fiber, comprising the following steps: Step 1: Preparation of antibacterial polyester masterbatch Ethylene glycol, terephthalic acid, an antibacterial modifier and a dispersant are added into a reaction kettle and stirred evenly, and then a catalyst is added to obtain polyester through esterification reaction and polycondensation reaction. The polyester is extruded, granulated and dried to obtain an antibacterial polyester masterbatch; Step 2: Preparation of antibacterial polyester staple fiber The antibacterial polyester masterbatch and polyester chips obtained in step 1 are used as raw materials, and vacuum drying is performed to obtain a mixed spinning raw material; the mixed spinning raw material enters a twin-screw to form a melt for uniform extrusion, and then the melt is quantitatively transported to a spinning assembly through a metering pump, and finally extruded from a spinneret to form a filament, which is then oiled by an oil roller, wound, and cut to obtain an antibacterial polyester staple fiber after cooling; Wherein, the structure of the antibacterial modifier in step 1 is:

2. The preparation method according to claim 1, characterized in that: The dispersant in step 1 is selected from one or more of sodium hexametaphosphate, white oil, zinc stearate, polyethylene wax, stearic acid, paraffin and ethylene bisstearamide.

3. The preparation method according to claim 1, characterized in that: The catalyst in step 1 is selected from one or more of zinc acetate, cobalt acetate, Sb2O3 and manganese acetate.

4. The preparation method according to claim 1, characterized in that: In step 1, the molar ratio of terephthalic acid to ethylene glycol is 1:(1.1-1.5); the molar ratio of terephthalic acid to antibacterial modifier is 1:(0.1-0.5); the amount of catalyst used is (0.1-0.5)wt% of the mass of terephthalic acid; the esterification reaction temperature is 200-250°C, and the esterification pressure is 0.1-0.5MPa; the polycondensation reaction temperature is 200-250°C, and the polycondensation pressure is 70-120Pa.

5. The preparation method according to claim 1, characterized in that: The intrinsic viscosity of the polyester chips in step 2 is 0.5-0.8 dL / g.

6. The preparation method according to claim 1, characterized in that: The mass ratio of the antibacterial polyester masterbatch to the polyester chips in step 2 is (1-10):(99-90).

7. The preparation method according to claim 1, characterized in that: The screw temperature of step 2 is: 250-280°C in zone 1, 270-300°C in zone 2, 280-290°C in zone 3, and 280-290°C in zone 4; the metering pump temperature is 280-290°C; the spinning box temperature is 280-290°C; and the spinning speed is 400-800m / min.

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