Cool antistatic polyester fiber and preparation method thereof

Abstract

The invention relates to the field of polyester fibers, in particular to a cool-feeling antistatic polyester fiber and a preparation method thereof.The cool-feeling antistatic polyester fiber is prepared from, by weight, 80-100 parts of modified PET, 3-5 parts of mint essential oil microcapsules, 5-10 parts of modified jade powder, 1-3 parts of flame retardant and 0.5-1 part of antioxidant. The cool antistatic polyester fiber prepared by the invention has good antistatic property and mechanical property.

Description

Technical Field

[0001] The invention relates to the field of polyester fibers, and in particular to a cool antistatic polyester fiber and a preparation method thereof. Background Art

[0002] With the development of science and technology and the improvement of people's living standards, people have higher requirements for the functionality of clothing fabrics, and comfort and functionality have become one of the top demands. With the development of the global warming trend, people have a great demand for the cool and comfortable functions of summer clothing, and often hope to keep their body temperature within a comfortable range during outdoor activities. Among clothing fabrics, polyester fiber is widely used in textile and clothing manufacturing fields due to its excellent wrinkle resistance, shape retention, wear resistance, and non-stickiness. However, the thermal and moisture conductivity of clothing made of polyester fiber is poor, which will reduce the comfort of clothing. Therefore, cool polyester fiber with good thermal conductivity is gradually favored by people.

[0003] Patent CN118027614A discloses a fiber-grade cool antibacterial masterbatch and a preparation method thereof. The fiber-grade cool antibacterial masterbatch includes a cool antibacterial composite material, a dispersant and a polyester matrix. The cool antibacterial composite material includes an aluminum nitride core, zinc oxide coated outside the aluminum nitride core, and silicon coated outside the zinc oxide. The polyester fiber made of the material has the effect of rapid heat conduction, cooling and heat dissipation, and can also have high-efficiency antibacterial properties. In addition, the surface of the cool antibacterial composite material in the cool antibacterial masterbatch is coated with a silicon coating, which can significantly reduce the surface energy of zinc oxide and significantly improve the dispersibility of the cool material, so that the cool antibacterial composite material will not agglomerate in the organic polyester, and can be evenly dispersed in the polyester fiber, improving the spinnability. However, the thermal conductivity of zinc oxide is poorer than that of aluminum nitride, and the use of zinc oxide to coat aluminum nitride may deteriorate the thermal conductivity of aluminum nitride.

[0004] Patent CN107815754A discloses a cool and thermostatic polyester fiber and its preparation method, clothing and shoes, including: a core layer, the components of the core layer include polyethylene terephthalate and poly (1,3-propylene terephthalate); a skin layer located outside the core layer, the skin layer is made of a cool and thermostatic masterbatch; wherein the components of the cool and thermostatic masterbatch are measured by mass, including compound functional additives and polyethylene terephthalate; the components of the compound functional additives include phase change microcapsule materials and cool materials. The cool and thermostatic polyester fiber of this application makes the cool and thermostatic masterbatch into a skin layer, which not only has a long-lasting cool function, but also combines the cool feeling with the constant temperature function to avoid the dampness and stickiness caused by sweating under hot summer conditions. However, the poor adhesion between the cool particles and the box-changing microcapsules and the polyester of the core layer may make the skin layer easy to fall off, resulting in a short-lasting cool and thermostatic effect.

[0005] Therefore, there is an urgent need for a cool feeling polyester fiber with excellent thermal conductivity in the market. Summary of the invention

[0006] In view of the problems existing in the prior art, the object of the present invention is to obtain a cool antistatic polyester fiber with good thermal conductivity, antistatic performance and mechanical properties.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] On one hand, the present invention provides a cool antistatic polyester fiber, which comprises the following raw materials, by weight: 80-100 parts of modified PET, 3-5 parts of peppermint essential oil microcapsules, 5-10 parts of modified jade powder, 1-3 parts of flame retardant, and 0.5-1 part of antioxidant.

[0009] The present invention prepares polyester fibers by blending modified PET, peppermint essential oil microcapsules, modified jade powder, flame retardants and antioxidants to obtain polyester masterbatch and then melt spinning the masterbatch to obtain polyester fibers having good thermal conductivity, antistatic properties and mechanical properties.

[0010] In some embodiments, the method for preparing the modified PET comprises the following steps:

[0011] A1, adding lecithin, hydrogen peroxide and acetic acid to ethanol, reacting at 55-70°C for 2-3h, washing and drying to obtain hydroxylated lecithin;

[0012] A2. Add terephthalic acid, diol and catalyst into a reaction vessel, raise the temperature to 240-260° C. and the pressure to 0.2-0.3 MPa, react until the esterification rate is 99.3-99.7%, stop the reaction, add polyethylene glycol, raise the temperature to 260-270° C. and the pressure to 0.1-0.2 MPa, react for 0.5-1.5 h, add the hydroxylated lecithin obtained in step A1, react at a pressure of 100-200 KPa for 0.5-1.5 h, adjust the pressure to 1-10 KPa, react for 1.5-3.5 h to obtain modified PET.

[0013] Preferably, the lecithin is egg yolk lecithin.

[0014] Compared with conventional lecithin, egg yolk lecithin has a higher content of phosphatidylcholine, which is conducive to the introduction of more phosphate groups and quaternary ammonium groups on the PET chain segments. The introduction of phosphate groups can improve the water absorption of polyester fibers, and the positive charge carried on quaternary ammonium salts can increase the electron transfer rate. The synergistic effect of the two is conducive to improving the antistatic properties of polyester fibers.

[0015] The present application can improve the mechanical properties, antistatic properties and heat resistance of polyester fibers by using hydroxylated lecithin to modify PET. This may be because, on the one hand, a large number of phosphate groups and quaternary ammonium groups can be introduced into the PET chain segment, which can improve the antistatic properties of the PET chain segment; on the other hand, the hydroxylated lecithin contains multiple hydroxyl groups, which can participate in the polymerization reaction and act as a cross-linking agent, thereby improving the mechanical properties and heat resistance of PET.

[0016] Preferably, the mass ratio of terephthalic acid, diol and polyethylene glycol in step A2 is 1:(0.3-0.6):(0.1-0.3).

[0017] In some embodiments, the mass ratio of the hydroxylated lecithin to terephthalic acid in step A2 is (0.1-0.3):1.

[0018] When the content of hydrophilic groups is too high, it will seriously affect the fiber forming and mechanical properties of the fiber. The present application selects a specific ratio of hydroxylated lecithin and terephthalic acid to make the polyester fiber have better antistatic and heat resistance properties while having better mechanical properties.

[0019] In some embodiments, the method for preparing the peppermint essential oil microcapsules comprises the following steps:

[0020] B1. Add emulsifier and initiator into deionized water, stir at 30-40°C for 20-30 minutes to obtain an aqueous phase;

[0021] B2, adding peppermint essential oil and terephthaloyl chloride into cyclohexane, stirring at 30-40° C. for 20-30 min to obtain an oil phase;

[0022] B3, adding the oil phase obtained in step B2 to the water phase obtained in step B1, stirring at room temperature for 20-30 min, adding dropwise a 20-30 wt % diethylenetriamine cyclohexane solution under ultraviolet light, reacting at 30-40° C. for 2-4 h to obtain a suspension, and spray drying the suspension to obtain peppermint essential oil microcapsules.

[0023] The present invention uses terephthaloyl chloride and diethylenetriamine to react to prepare microcapsules to encapsulate peppermint essential oil, which can slowly release the peppermint essential oil and make the cooling feeling of polyester fiber more lasting. In addition, preparing the peppermint essential oil into microcapsules can make the peppermint essential oil less likely to decompose during the production and processing of polyester fiber. In addition, the reaction of terephthaloyl chloride and diethylenetriamine can generate amide bonds, which can further improve the mechanical properties of polyester fiber.

[0024] In some embodiments, the mass ratio of the peppermint essential oil to terephthaloyl chloride is 1:(0.15-0.35).

[0025] In some embodiments, the mass ratio of the terephthaloyl chloride to the cyclohexane solution of 20-30 wt % diethylenetriamine is 1:(2.5-3.5).

[0026] The present application can improve the cooling feeling and mechanical properties of polyester fibers by limiting the mass ratio of peppermint essential oil to terephthaloyl chloride and terephthaloyl chloride to 20-30wt% diethylenetriamine cyclohexane solution. This may be because some amino groups remaining on the peppermint essential oil can react with the isocyanate groups on the modified jade powder, making the peppermint essential oil microcapsules easier to disperse in the polyester fibers.

[0027] In some embodiments, the preparation method of the modified jade powder comprises the following steps: adding jade powder and KH560 silane coupling agent to 95-98wt% ethanol and ultrasonicating for 30-60min, adding 2,4-toluene diisocyanate and acetone, stirring at 60-70°C for 2-4h, cooling to room temperature, and rotary evaporating to obtain modified jade powder.

[0028] In the present application, by using KH560 silane coupling agent and 2,4-toluene diisocyanate to modify jade powder, the jade powder can be more easily dispersed in polyester fibers, and the isocyanate group can react with the hydroxyl group on the modified PET, which is beneficial to improving the thermal conductivity and mechanical properties of the polyester fiber.

[0029] In some embodiments, the mass ratio of the jade powder to the KH560 silane coupling agent is 1:(0.3-0.6).

[0030] In some embodiments, the mass ratio of the jade powder to 2,4-toluene diisocyanate is 1:(0.2-0.5).

[0031] The present application can improve the mechanical properties and thermal conductivity of polyester fibers by limiting the mass ratio of jade powder and KH560 silane coupling agent and jade powder and 2,4-toluene diisocyanate. This may be because the modified jade powder contains some isocyanate groups, which can react with the amino groups on the peppermint essential oil microcapsules and the hydroxyl groups on the modified PET chain segments, which is beneficial to improving the compatibility of the components.

[0032] In some embodiments, the antioxidant is a combination of one or more of a hindered phenol antioxidant, a phosphite antioxidant, a thioester antioxidant, a benzofuran antioxidant, and a hydroxylamine antioxidant.

[0033] Preferably, the antioxidant is a hindered phenol antioxidant.

[0034] More preferably, the antioxidant is antioxidant 1010.

[0035] Another aspect of the present invention provides a method for preparing a cool antistatic polyester fiber, comprising the following steps:

[0036] S1. After mixing modified PET, modified jade powder, peppermint essential oil microcapsules, flame retardant and antioxidant, add them into a twin-screw extruder for extrusion granulation. The feeding speed of the twin-screw extruder is 20-30rpm and the extrusion temperature is 240-250°C to obtain masterbatch;

[0037] S2. The masterbatch obtained in step S1 is melt-spun at a spinning temperature of 200-260° C. and a spinning speed of 1000-2000 m / min. After spinning, the masterbatch is placed at 30-40° C. for 0.5-1.5 h, and then heated to 60-70° C. for stretching at a stretching multiple of 1.5-2.5 times to obtain a cool antistatic polyester fiber.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) The polyester fiber obtained by blending modified PET, peppermint essential oil microcapsules, modified jade powder, flame retardant and antioxidant to obtain polyester masterbatch and then melt spinning the masterbatch has good thermal conductivity, antistatic properties and mechanical properties.

[0040] (2) The present invention can improve the mechanical properties, antistatic properties and heat resistance of polyester fibers by using hydroxylated lecithin to modify PET, and the present invention can make the polyester fibers have good antistatic properties and heat resistance while having good mechanical properties by selecting a specific ratio of hydroxylated lecithin and terephthalic acid.

[0041] (3) The present invention uses terephthaloyl chloride and diethylenetriamine to react to prepare microcapsules to encapsulate peppermint essential oil, which can slowly release the peppermint essential oil and make the cooling feeling of the polyester fiber more lasting. In addition, preparing the peppermint essential oil into microcapsules can make the peppermint essential oil less likely to decompose during the production and processing of polyester fibers. In addition, the reaction of terephthaloyl chloride and diethylenetriamine can generate amide bonds, which can further improve the mechanical properties of polyester fibers.

[0042] (4) The present invention can make the jade powder more easily dispersed in the polyester fiber by using KH560 silane coupling agent and 2,4-toluene diisocyanate to modify the jade powder, and the isocyanate group can react with the hydroxyl group on the modified PET, which is beneficial to improving the thermal conductivity and mechanical properties of the polyester fiber. DETAILED DESCRIPTION

[0043] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0044] In the following embodiments and comparative examples, except for modified PET, modified jade powder and peppermint essential oil microcapsules, the other compounds and related reagents used can be purchased from the market. The average particle size of the jade powder is 1250 mesh, which is purchased from Erping Mineral Products Processing Plant in Lingshou County; the model of egg yolk lecithin is AS-01, which is purchased from Shaanxi Xiazhou Biotechnology Co., Ltd.; and polyethylene glycol-600 is purchased from Nanjing Yingguan New Materials Technology Co., Ltd.

[0045] Preparation Example 1

[0046] The preparation method of modified PET-1 comprises the following steps:

[0047] A1, add 10g egg yolk lecithin, 3g hydrogen peroxide and 0.5g acetic acid to 30g anhydrous ethanol, react at 65°C for 2.5h, wash and dry to obtain hydroxylated lecithin;

[0048] A2. Add 10 g of terephthalic acid, 4.5 g of ethylene glycol and 0.1 g of tetrabutyl titanate into a reaction vessel, heat to 250° C., and react at a pressure of 0.2 MPa until the esterification rate reaches 99.5%, then stop the reaction, add 2 g of polyethylene glycol-600, heat to 265° C., and react at a pressure of 0.2 MPa for 1 h, add 2 g of hydroxylated lecithin obtained in step A1, react at a pressure of 150 KPa for 1 h, adjust the pressure to 5 KPa, and react for 2.5 h to obtain modified PET-1.

[0049] Preparation Example 2

[0050] The preparation method of modified PET-2 is the same as that of Preparation Example 1, except that the added amount of hydroxylated lecithin is 5 g.

[0051] Preparation Example 3

[0052] The preparation method of PET comprises the following steps: adding 10g of terephthalic acid, 4.5g of ethylene glycol and 0.1g of tetrabutyl titanate into a reaction container, heating to 250°C and under a pressure of 0.2MPa, reacting until the esterification rate is measured to be 99.5%, stopping the reaction, adding 2g of polyethylene glycol-600, heating to 265°C and under a pressure of 0.2MPa, reacting for 1h, adjusting the pressure to 5KPa and reacting for 2.5h to obtain PET.

[0053] Preparation Example 4

[0054] The preparation method of peppermint essential oil microcapsule-1 comprises the following steps:

[0055] B1. Add 2 g of Tween-80 and 1 g of triethylamine into 50 g of deionized water, and stir at 35°C for 25 min to obtain an aqueous phase;

[0056] B2, add 10g of peppermint essential oil and 2.5g of terephthaloyl chloride into 20g of cyclohexane, stir at 35°C for 25min to obtain an oil phase;

[0057] B3. Add the oil phase obtained in step B2 to 80 g of the aqueous phase obtained in step B1, stir at room temperature for 25 min, add dropwise 7.5 g of a 25 wt% cyclohexane solution of diethylenetriamine under ultraviolet light, react at 35 ° C for 3 h to obtain a suspension, spray-dry the suspension to obtain peppermint essential oil microcapsule-1, the inlet temperature of the spray drying is 120 ° C, the outlet temperature is 80 ° C, and the feed flow rate is 7.5 mL / min.

[0058] Preparation Example 5

[0059] The preparation method of peppermint essential oil microcapsule-2 is the same as that of Preparation Example 4, except that the added amount of terephthaloyl chloride is 5 g.

[0060] Preparation Example 6

[0061] The preparation method of peppermint essential oil microcapsule-3 is the same as that of Preparation Example 4, except that the added amount of 25wt% diethylenetriamine cyclohexane solution is 5g.

[0062] Preparation Example 7

[0063] The preparation method of modified jade powder-1 comprises the following steps: adding 10g jade powder and 4.5g KH560 silane coupling agent into 40g 97wt% ethanol, ultrasonicating for 45min, adding 3.5g 2,4-toluene diisocyanate and 30g acetone, stirring at 65°C for 3h, cooling to room temperature, and rotary evaporating to obtain modified jade powder-1.

[0064] Preparation Example 8

[0065] The preparation method of modified jade powder-2 is the same as that of Preparation Example 7, except that the added amount of KH560 silane coupling agent is 2 g.

[0066] Preparation Example 9

[0067] The preparation method of modified jade powder-3 is the same as that of Preparation Example 7, except that the added amount of 2,4-toluene diisocyanate is 1 g.

[0068] Example 1

[0069] A cool antistatic polyester fiber comprises the following raw materials, measured by weight: 190 parts of modified PET, 14 parts of peppermint essential oil microcapsules, 17 parts of modified jade powder, 2 parts of triphenyl phosphate, and 10100.7 parts of an antioxidant.

[0070] The preparation method of the cool antistatic polyester fiber of this embodiment comprises the following steps:

[0071] S1, after mixing modified PET-1, modified jade powder-1, peppermint essential oil microcapsule-1, triphenyl phosphate and antioxidant 1010, adding them into a twin-screw extruder for extrusion granulation, the feeding speed of the twin-screw extruder is 25rpm, and the extrusion temperature is 245°C to obtain masterbatch;

[0072] S2. The masterbatch obtained in step S1 is melt-spun at a spinning temperature of 240° C. and a spinning speed of 1500 m / min. After spinning, the masterbatch is placed at 35° C. for 1 hour, and then heated to 65° C. for stretching at a stretching multiple of 2 to obtain a cool antistatic polyester fiber.

[0073] Example 2

[0074] A cool antistatic polyester fiber comprises the following raw materials, measured by weight: 180 parts of modified PET, 13 parts of peppermint essential oil microcapsules, 15 parts of modified jade powder, 1 part of triphenyl phosphate, and 10100.5 parts of antioxidants.

[0075] The preparation method of the cool antistatic polyester fiber of this embodiment comprises the following steps:

[0076] S1, after mixing modified PET-1, modified jade powder-1, peppermint essential oil microcapsule-1, triphenyl phosphate and antioxidant 1010, adding them into a twin-screw extruder for extrusion granulation, the feeding speed of the twin-screw extruder is 20rpm, and the extrusion temperature is 240°C to obtain masterbatch;

[0077] S2. The masterbatch obtained in step S1 is melt-spun at a spinning temperature of 200° C. and a spinning speed of 1000 m / min. After spinning, the masterbatch is placed at 30° C. for 1.5 h, and then heated to 60° C. for stretching at a stretching multiple of 2 to obtain a cool antistatic polyester fiber.

[0078] Example 3

[0079] A cool antistatic polyester fiber comprises the following raw materials, measured by weight: 1100 parts of modified PET, 15 parts of peppermint essential oil microcapsules, 110 parts of modified jade powder, 3 parts of triphenyl phosphate, and 10101 parts of an antioxidant.

[0080] The preparation method of the cool antistatic polyester fiber of this embodiment comprises the following steps:

[0081] S1, after mixing modified PET-1, modified jade powder-1, peppermint essential oil microcapsule-1, triphenyl phosphate and antioxidant 1010, adding them into a twin-screw extruder for extrusion granulation, the feeding speed of the twin-screw extruder is 30rpm, and the extrusion temperature is 250°C to obtain masterbatch;

[0082] S2. The masterbatch obtained in step S1 is melt-spun at a spinning temperature of 260° C. and a spinning speed of 2000 m / min. After spinning, the masterbatch is placed at 40° C. for 0.5 h, and then heated to 70° C. for stretching at a stretching multiple of 2 to obtain a cool antistatic polyester fiber.

[0083] Example 4

[0084] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that an equal amount of modified PET-1 is replaced by modified PET-2.

[0085] Example 5

[0086] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of peppermint essential oil microcapsule-1 is replaced by peppermint essential oil microcapsule-2.

[0087] Example 6

[0088] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of peppermint essential oil microcapsule-1 is replaced by peppermint essential oil microcapsule-3.

[0089] Example 7

[0090] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified jade powder-1 is replaced by modified jade powder-2.

[0091] Example 8

[0092] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified jade powder-1 is replaced by modified jade powder-3.

[0093] Comparative Example 1

[0094] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified PET-1 is replaced by PET.

[0095] Comparative Example 2

[0096] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of peppermint essential oil microcapsules-1 is replaced by peppermint essential oil.

[0097] Comparative Example 3

[0098] A cool antistatic polyester fiber and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified jade powder-1 is replaced by jade powder.

[0099] Performance Testing

[0100] The cool antistatic polyester fibers obtained in the above embodiments and comparative examples were tested:

[0101] (1) Antistatic performance: The charge surface density of the examples and comparative examples was tested with reference to GB / T 12703.1-2021 “Test method for electrostatic properties of textiles”.

[0102] (2) Mechanical properties: The mechanical properties of the cool antistatic polyester fibers were tested on a multifilament strength tester with a pre-tension of 3 cN, a stretching speed of 200 mm / min, and a clamping distance of 200 mm.

[0103] (3) Cooling sensation: The instant cooling sensation values ​​of the examples and comparative examples were tested with reference to GB / T35263-2017 “Testing and evaluation of instant cooling sensation of textiles upon contact”.

[0104] The test results are shown in Table 1:

[0105] Table 1

[0106]

[0107] It can be seen from the data in Table 1 that the cool antistatic polyester fibers in Examples 1-3 of the present invention have good mechanical properties, cool feeling and antistatic properties. From the comparison between Example 4 and Example 1, it can be seen that changing the ratio of hydroxylated lecithin to terephthalic acid will make the water absorption of the polyester fiber too high, resulting in a decrease in the mechanical properties of the cool antistatic polyester fiber; from the comparison between Examples 5 and 6 and Example 1, it can be seen that changing the ratio of peppermint essential oil to terephthaloyl chloride or terephthaloyl chloride to a cyclohexane solution of 25 wt% diethylenetriamine will prevent some amine groups from remaining on the peppermint essential oil, resulting in poor dispersibility of the modified jade powder and peppermint essential oil microcapsules in the polyester fiber, resulting in a decrease in the mechanical properties and instantaneous cool value of the cool antistatic polyester fiber; from the comparison between Examples 7 and 8 and Example 1, From the comparison, it can be seen that changing the ratio of jade powder and KH560 silane coupling agent or jade powder and 2,4-toluene diisocyanate will make the residual -NCO groups in the system insufficient to react with the amino groups on the peppermint essential oil microcapsules and the hydroxyl groups on the modified PET, thereby reducing the mechanical properties and instantaneous cooling value of the cool antistatic polyester fiber; from the comparison of comparative example 1 and example 1, it can be seen that when unmodified PET is added, the antistatic performance of the cool antistatic polyester fiber is poor; from the comparison of comparative example 2 and example 1, it can be seen that when peppermint essential oil is directly added, the instantaneous cooling value of the cool antistatic polyester fiber decreases; from the comparison of comparative example 3 and example 1, it can be seen that when unmodified jade powder is added, the mechanical properties and instantaneous cooling value of the cool antistatic polyester fiber decrease.

[0108] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A cool antistatic polyester fiber, characterized in that: The invention comprises the following raw materials in parts by weight: 80-100 parts of modified PET, 3-5 parts of peppermint essential oil microcapsules, 5-10 parts of modified jade powder, 1-3 parts of flame retardant and 0.5-1 parts of antioxidant.

2. The cool antistatic polyester fiber according to claim 1, characterized in that: The preparation method of the modified PET comprises the following steps: A1, adding lecithin, hydrogen peroxide and acetic acid to ethanol, reacting at 55-70°C for 2-3h, washing and drying to obtain hydroxylated lecithin; A2. Add terephthalic acid, diol and catalyst into a reaction vessel, raise the temperature to 240-260° C. and the pressure to 0.2-0.3 MPa, react until the esterification rate is 99.3-99.7%, stop the reaction, add polyethylene glycol, raise the temperature to 260-270° C. and the pressure to 0.1-0.2 MPa, react for 0.5-1.5 h, add the hydroxylated lecithin obtained in step A1, react at a pressure of 100-200 KPa for 0.5-1.5 h, adjust the pressure to 1-10 KPa, react for 1.5-3.5 h to obtain modified PET.

3. The cool antistatic polyester fiber according to claim 2, characterized in that: The mass ratio of hydroxylated lecithin to terephthalic acid in step A2 is (0.1-0.3):

1.

4. The cool antistatic polyester fiber according to claim 1, characterized in that: The preparation method of the peppermint essential oil microcapsules comprises the following steps: B1. Add emulsifier and initiator into deionized water, stir at 30-40°C for 20-30 minutes to obtain aqueous phase; B2, adding peppermint essential oil and terephthaloyl chloride into cyclohexane, stirring at 30-40° C. for 20-30 min to obtain an oil phase; B3, adding the oil phase obtained in step B2 to the water phase obtained in step B1, stirring at room temperature for 20-30 min, adding dropwise a 20-30 wt % diethylenetriamine cyclohexane solution under ultraviolet light, reacting at 30-40° C. for 2-4 h to obtain a suspension, and spray drying the suspension to obtain peppermint essential oil microcapsules.

5. The cool antistatic polyester fiber according to claim 4, characterized in that: The mass ratio of the peppermint essential oil to terephthaloyl chloride is 1:(0.15-0.35).

6. The cool antistatic polyester fiber according to claim 4, characterized in that: The mass ratio of the terephthaloyl chloride to the cyclohexane solution of 20-30wt% diethylenetriamine is 1:(2.5-3.5).

7. The cool antistatic polyester fiber according to claim 1, characterized in that: The preparation method of the modified jade powder comprises the following steps: adding jade powder and KH560 silane coupling agent into 95-98wt% ethanol, ultrasonicating for 30-60min, adding 2,4-toluene diisocyanate and acetone, stirring at 60-70°C for 2-4h, cooling to room temperature, and rotary evaporating to obtain the modified jade powder.

8. The cool antistatic polyester fiber according to claim 7, characterized in that: The mass ratio of the jade powder to the KH560 silane coupling agent is 1:(0.3-0.6).

9. The cool antistatic polyester fiber according to claim 7, characterized in that: The mass ratio of the jade powder to 2,4-toluene diisocyanate is 1:(0.2-0.5).

10. A method for preparing the cool antistatic polyester fiber according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. After mixing modified PET, modified jade powder, peppermint essential oil microcapsules, flame retardant and antioxidant, add them into a twin-screw extruder for extrusion granulation. The feeding speed of the twin-screw extruder is 20-30rpm and the extrusion temperature is 240-250°C to obtain masterbatch; S2. The masterbatch obtained in step S1 is melt-spun at a spinning temperature of 200-260° C. and a spinning speed of 1000-2000 m / min. After spinning, the masterbatch is placed at 30-40° C. for 0.5-1.5 h, and then heated to 60-70° C. for stretching at a stretching multiple of 1.5-2.5 times to obtain a cool antistatic polyester fiber.

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