Cooling antistatic polyester fiber and its preparation method

Abstract

The present application relates to the field of polyester fiber, in particular to a cool and antistatic polyester fiber and a preparation method thereof, the cool and antistatic polyester fiber comprises the following raw materials in parts by weight: modified PET 80-100 parts, peppermint essential oil microcapsule 3-5 parts, modified jade stone powder 5-10 parts, flame retardant 1-3 parts, antioxidant 0.5-1 part.The cool and antistatic polyester fiber prepared by the present application has good antistatic property and mechanical property.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of polyester fibers, in particular to a cool and antistatic polyester fiber and a preparation method thereof. BACKGROUND

[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 preferred demands. With the development of global warming trend, people have great demand for the cool and comfortable function of summer clothes, and often hope to keep the body temperature within a comfortable range when outdoor activities. In the clothing fabric, polyester fibers are widely used in textile and garment manufacturing fields due to their excellent wrinkle resistance, shape retention, wear resistance, and non-sticky hair. However, the poor heat and moisture conductivity of clothes made of polyester fibers will lead to a decrease in the comfort of clothes, so cool and heat-conductive polyester fibers are gradually favored by people.

[0003] Patent CN118027614A discloses a fiber-grade cool and antibacterial masterbatch and a preparation method thereof. The fiber-grade cool and antibacterial masterbatch includes a cool and antibacterial composite material, a dispersing agent, and a polyester matrix. The cool and antibacterial composite material includes an aluminum nitride core, zinc oxide coated on the outside of the aluminum nitride core, and silicon coated on the outside of the zinc oxide. The polyester fiber made of the material has the effects of rapid heat conduction, cooling, and heat dissipation, and also has high-efficiency antibacterial performance. In addition, the cool and antibacterial composite material in the cool and 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. The cool and antibacterial composite material will not agglomerate in the organic polyester and can be uniformly 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 reduce the thermal conductivity of aluminum nitride.

[0004] Patent CN107815754A discloses a cool and temperature-regulating polyester fiber and a preparation method, clothing, and shoes thereof. The cool and temperature-regulating polyester fiber includes a core layer and a skin layer. The core layer includes polyethylene terephthalate and polytrimethylene terephthalate. The skin layer is made of a cool and temperature-regulating masterbatch. The cool and temperature-regulating masterbatch includes a compounded functional additive and polyethylene terephthalate. The compounded functional additive includes phase change microcapsule material and cool material. The cool and temperature-regulating polyester fiber of the application not only has a persistent cool function but also combines cool and constant temperature functions to avoid the feeling of dampness and stickiness caused by sweating in hot summer conditions. However, the adhesion between the cool particles and the phase change microcapsules and the polyester of the core layer may cause the skin layer to easily fall off, resulting in a short-lasting cool and temperature-regulating effect.

[0005] Therefore, there is an urgent need in the market for a cool polyester fiber with excellent heat conduction performance. SUMMARY

[0006] In view of the problems in the prior art, the purpose of the present application is to obtain a cool antistatic polyester fiber with good heat conduction performance, antistatic performance and mechanical properties.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0008] In one aspect, the present application provides a cool antistatic polyester fiber, which comprises the following raw materials in parts by weight: modified PET 80-100 parts, peppermint oil microcapsule 3-5 parts, modified jade powder 5-10 parts, flame retardant 1-3 parts, antioxidant 0.5-1 part.

[0009] The polyester fiber obtained by blending modified PET, peppermint oil microcapsule, modified jade powder, flame retardant and antioxidant to obtain polyester masterbatch and then melt spinning has good heat conduction performance, antistatic performance and mechanical properties.

[0010] In some embodiments, the preparation method of the modified PET comprises the following steps:

[0011] A1, lecithin, hydrogen peroxide and acetic acid are added to ethanol, and reacted at 55-70℃ for 2-3h, then washed and dried to obtain hydroxylated lecithin;

[0012] A2, terephthalic acid, dihydric alcohol and catalyst are added to a reaction vessel, heated to 240-260℃, and reacted at a pressure of 0.2-0.3MPa until the esterification rate is 99.3-99.7%, then polyethylene glycol is added, heated to 260-270℃, and reacted at a pressure of 0.1-0.2MPa for 0.5-1.5h, then the hydroxylated lecithin obtained in step A1 is added, and reacted at a pressure of 100-200KPa for 0.5-1.5h, then the pressure is adjusted to 1-10KPa and reacted for 1.5-3.5h to obtain modified PET.

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

[0014] Compared with conventional lecithin, the content of phosphatidylcholine in egg yolk lecithin is higher, which is beneficial to introducing more phosphate groups and quaternary ammonium groups on the PET segment. The introduction of phosphate groups can improve the water absorption of the polyester fiber, and the positive charge carried by the quaternary ammonium salt can improve the transmission rate of electrons, and the synergistic effect of the two is beneficial to improving the antistatic performance of the polyester fiber.

[0015] The 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 to act as a crosslinking agent, thereby improving the mechanical properties and heat resistance of PET.

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

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

[0018] A large amount of hydrophilic groups will seriously affect the fiber forming and the mechanical properties of the fiber. By selecting a specific ratio of hydroxylated lecithin to terephthalic acid, the polyester fiber can have good antistatic properties and heat resistance while having good mechanical properties.

[0019] In some embodiments, the preparation method of the peppermint essential oil microcapsule comprises the following steps:

[0020] B1, adding an emulsifier and an initiator to deionized water, stirring at 30-40°C for 20-30 min to obtain an aqueous phase;

[0021] B2, adding peppermint essential oil and terephthaloyl chloride to 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 aqueous phase obtained in step B1, stirring at room temperature for 20-30 min, adding a 20-30 wt% solution of diethylenetriamine in cyclohexane under ultraviolet light irradiation, 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] By using terephthaloyl chloride and diethylenetriamine to prepare microcapsules to encapsulate peppermint essential oil, the application can make the peppermint essential oil release slowly, making the cooling sensation of the polyester fiber more lasting. Furthermore, preparing the peppermint essential oil into microcapsules can prevent the decomposition of the peppermint essential oil during the production and processing of the polyester fiber. Moreover, the reaction of terephthaloyl chloride and diethylenetriamine can generate amide bonds, which can further improve the mechanical properties of the polyester fiber.

[0024] In some embodiments, the mass ratio of 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 20-30wt% diethylene triamine is 1:(2.5-3.5).

[0026] The present application can improve the cooling sensation and mechanical properties of the polyester fiber by limiting the mass ratio of the peppermint essential oil to the terephthaloyl chloride and the terephthaloyl chloride to the cyclohexane solution of 20-30wt% diethylene triamine, which may be because part of the amine groups remaining on the peppermint essential oil can react with the isocyanate groups on the modified jade powder to make the peppermint essential oil microcapsules more easily dispersed in the polyester fiber.

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

[0028] The present application can make the jade powder more easily dispersed in the polyester fiber by modifying the jade powder using KH560 silane coupling agent and 2,4-toluene diisocyanate, and the isocyanate groups can react with the hydroxyl groups on the modified PET, which is beneficial to improve 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 the 2,4-toluene diisocyanate is 1:(0.2-0.5).

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

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

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

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

[0035] Another aspect of the present application provides a preparation method of a cooling antistatic polyester fiber, comprising the following steps:

[0036] S1, the modified PET, modified jade powder, peppermint essential oil microcapsule, flame retardant, antioxidant are mixed, then added into a double screw extruder for extrusion granulation, the feeding rotation speed of the double screw extruder is 20-30 rpm, the extrusion temperature is 240-250 DEG C, and the master batch is obtained;

[0037] S2, the master batch obtained in step S1 is subjected to melt spinning, the spinning temperature is 200-260 DEG C, the spinning speed is 1000-2000 m / min, after spinning, placed at 30-40 DEG C for 0.5-1.5 h, then heated to 60-70 DEG C for drawing processing, and the drawing multiple is 1.5-2.5 times, and the cool anti-static polyester fiber is obtained.

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

[0039] (1) The polyester master batch obtained by blending the modified PET, the peppermint essential oil microcapsule, the modified jade powder, the flame retardant and the antioxidant, and then subjected to melt spinning to obtain the polyester fiber, has good heat conduction performance, anti-static performance and mechanical properties.

[0040] (2) The application can improve the mechanical properties, anti-static performance and heat resistance of the polyester fiber by using the hydroxylated lecithin to modify the PET, and the polyester fiber has good anti-static performance, heat resistance and mechanical properties by selecting a specific ratio of hydroxylated lecithin and terephthalic acid.

[0041] (3) The application can make the peppermint essential oil slowly release, make the cool feeling of the polyester fiber more lasting, and the peppermint essential oil is not easy to decompose in the process of polyester fiber production and processing by using terephthaloyl chloride and diethylene triamine to react to prepare the microcapsule coated peppermint essential oil.

[0042] (4) The application 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 improve the heat conduction performance and mechanical properties of the polyester fiber. DETAILED DESCRIPTION

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

[0044] In the following examples and comparative examples, the compounds and related reagents used, except for modified PET, modified jade powder, peppermint essential oil microcapsules, can be purchased from the market, among which the average particle size of the jade powder is 1250 mesh, purchased from Lingshou County Erping Mine Product Processing Factory; the type of egg yolk lecithin is AS-01, purchased from Shaanxi Xiazhou Biological Technology Co., Ltd.; polyethylene glycol-600 is purchased from Nanjing Yingguan New Material Technology Co., Ltd.

[0045] Preparation Example 1

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

[0047] A1, 10g of egg yolk lecithin, 3g of hydrogen peroxide and 0.5g of acetic acid are added to 30g of anhydrous ethanol, and reacted at 65℃ for 2.5h, then washed and dried to obtain hydroxylated lecithin;

[0048] A2, 10g of terephthalic acid, 4.5g of ethylene glycol and 0.1g of tetrabutyl titanate are added to a reaction container, and the temperature is raised to 250℃, the pressure is 0.2MPa, and the reaction is stopped when the esterification rate is measured to be 99.5%, 2g of polyethylene glycol-600 is added, the temperature is raised to 265℃, the pressure is 0.2MPa, and the reaction is carried out for 1h, 2g of hydroxylated lecithin obtained in step A1 is added, the pressure is adjusted to 150KPa, and the reaction is carried out for 1h, and then the pressure is adjusted to 5KPa, and the reaction is carried out for 2.5h 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 amount of hydroxylated lecithin added is 5g.

[0051] Preparation Example 3

[0052] The preparation method of PET comprises the following steps: 10g of terephthalic acid, 4.5g of ethylene glycol and 0.1g of tetrabutyl titanate are added to a reaction container, the temperature is raised to 250℃, the pressure is 0.2MPa, and the reaction is stopped when the esterification rate is measured to be 99.5%, 2g of polyethylene glycol-600 is added, the temperature is raised to 265℃, the pressure is 0.2MPa, and the reaction is carried out for 1h, and then the pressure is adjusted to 5KPa, and the reaction is carried out 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, 2g of Tween-80 and 1g of triethylamine are added to 50g of deionized water, stirred at 35℃ for 25min to obtain an aqueous phase;

[0056] B2, 10 g of peppermint essential oil and 2.5 g of terephthaloyl chloride were added into 20 g of cyclohexane, stirred at 35℃ for 25 min to obtain an oil phase;

[0057] B3, the oil phase obtained in step B2 was added into 80 g of the water phase obtained in step B1, stirred at room temperature for 25 min, 7.5 g of 25 wt% diethylene triamine cyclohexane solution was added dropwise under ultraviolet light irradiation, reacted at 35℃ for 3 h to obtain a suspension, and the suspension was spray dried to obtain peppermint essential oil microcapsule-1, the inlet air temperature of spray drying was 120℃, the outlet air temperature was 80℃, and the feeding flow rate was 7.5 mL / min.

[0058] Preparation Example 5

[0059] The preparation method of peppermint essential oil microcapsule-2 was the same as that of preparation example 4, except that the addition amount of terephthaloyl chloride was 5 g.

[0060] Preparation Example 6

[0061] The preparation method of peppermint essential oil microcapsule-3 was the same as that of preparation example 4, except that the addition amount of 25 wt% diethylene triamine cyclohexane solution was 5 g.

[0062] Preparation Example 7

[0063] The preparation method of modified jade powder-1 included the following steps: 10 g of jade powder and 4.5 g of KH560 silane coupling agent were added into 40 g of 97 wt% ethanol and ultrasonically treated for 45 min, 3.5 g of 2,4-toluene diisocyanate and 30 g of acetone were added, stirred at 65℃ for 3 h, cooled to room temperature, and rotary evaporated to obtain modified jade powder-1.

[0064] Preparation Example 8

[0065] The preparation method of modified jade powder-2 was the same as that of preparation example 7, except that the addition amount of KH560 silane coupling agent was 2 g.

[0066] Preparation Example 9

[0067] The preparation method of modified jade powder-3 was the same as that of preparation example 7, except that the addition amount of 2,4-toluene diisocyanate was 1 g.

[0068] Example 1

[0069] A cool and antistatic polyester fiber included the following raw materials in parts by weight: modified PET-190 parts, peppermint essential oil microcapsule-14 parts, modified jade powder-17 parts, triphenyl phosphate 2 parts, and antioxidant 10100.7 parts.

[0070] The preparation method of the cool and antistatic polyester fiber of the present example included the following steps:

[0071] S1, modified PET-1, modified jade powder-1, peppermint oil microcapsule-1, triphenyl phosphate, antioxidant 1010 were mixed, then added into a double screw extruder for extrusion granulation, the feeding rotation speed of the double screw extruder was 25 rpm, the extrusion temperature was 245℃, and a master batch was obtained;

[0072] S2, the master batch obtained in step S1 was subjected to melt spinning, the spinning temperature was 240℃, the spinning speed was 1500 m / min, after spinning, it was placed at 35℃ for 1 h, then heated to 65℃ for drawing processing, and the drawing multiple was 2 times, and a cool and antistatic polyester fiber was obtained.

[0073] Example 2

[0074] A cool and antistatic polyester fiber, including the following raw materials in parts by weight: modified PET-180 parts, peppermint oil microcapsule-13 parts, modified jade powder-15 parts, triphenyl phosphate 1 part, antioxidant 10100.5 parts.

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

[0076] S1, modified PET-1, modified jade powder-1, peppermint oil microcapsule-1, triphenyl phosphate, antioxidant 1010 were mixed, then added into a double screw extruder for extrusion granulation, the feeding rotation speed of the double screw extruder was 25 rpm, the extrusion temperature was 245℃, and a master batch was obtained;

[0077] S2, the master batch obtained in step S1 was subjected to melt spinning, the spinning temperature was 240℃, the spinning speed was 1500 m / min, after spinning, it was placed at 35℃ for 1 h, then heated to 65℃ for drawing processing, and the drawing multiple was 2 times, and a cool and antistatic polyester fiber was obtained.

[0078] Example 3

[0079] A cool and antistatic polyester fiber, including the following raw materials in parts by weight: modified PET-1100 parts, peppermint oil microcapsule-15 parts, modified jade powder-110 parts, triphenyl phosphate 3 parts, antioxidant 10101 part.

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

[0081] S1, modified PET-1, modified jade powder-1, peppermint oil microcapsule-1, triphenyl phosphate, antioxidant 1010 were mixed, then added into a double screw extruder for extrusion granulation, the feeding rotation speed of the double screw extruder was 25 rpm, the extrusion temperature was 245℃, and a master batch was obtained;

[0082] S2, melt spinning the master batch obtained in step S1, the spinning temperature is 260℃, the spinning speed is 2000m / min, after spinning, placing at 40℃ for 0.5h, then heating to 70℃ for drawing processing, the drawing multiple is 2 times, obtaining the cool and antistatic polyester fiber.

[0083] Example 4

[0084] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the modified PET-1 is replaced by the modified PET-2 in equal amount.

[0085] Example 5

[0086] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the peppermint essential oil microcapsule-1 is replaced by the peppermint essential oil microcapsule-2 in equal amount.

[0087] Example 6

[0088] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the peppermint essential oil microcapsule-1 is replaced by the peppermint essential oil microcapsule-3 in equal amount.

[0089] Example 7

[0090] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the modified jade powder-1 is replaced by the modified jade powder-2 in equal amount.

[0091] Example 8

[0092] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the modified jade powder-1 is replaced by the modified jade powder-3 in equal amount.

[0093] Comparative Example 1

[0094] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the modified PET-1 is replaced by the PET in equal amount.

[0095] Comparative Example 2

[0096] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the peppermint essential oil microcapsule-1 is replaced by the peppermint essential oil in equal amount.

[0097] Comparative Example 3

[0098] A cool and antistatic polyester fiber and a preparation method thereof, the specific implementation manner is same as example 1, the difference lies in that the modified jade powder-1 is replaced by the jade powder in equal amount.

[0099] Performance test

[0100] The cool anti-static polyester fibers obtained in the above examples and comparative examples were tested:

[0101] (1) Anti-static performance: The charge surface density of the examples and comparative examples was tested according to GB / T 12703.1-2021 "Textiles - Determination of the electrostatic properties".

[0102] (2) Mechanical properties: The mechanical properties of the cool anti-static 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) Coolness: The instant coolness value of the examples and comparative examples was tested according to GB / T 35263-2017 "Textiles - Determination of the instant coolness performance".

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

[0105] Table 1

[0106]

[0107] From the data in Table 1, it can be seen that the cool anti-static polyester fibers in Examples 1-3 have good mechanical properties, coolness, and anti-static performance. From the comparison of Example 4 and Example 1, it can be seen that changing the ratio of hydroxylated lecithin to terephthalic acid will make the polyester fiber have too high water absorption, resulting in a decrease in the mechanical properties of the cool anti-static polyester fiber. From the comparison of Examples 5, 6, and Example 1, it can be seen that changing the ratio of menthol oil to terephthalic dichloride or terephthalic dichloride to 25wt% diethylene triamine cyclohexane solution will make the amine group on the menthol oil not remain, resulting in poor dispersion of the modified jade powder and menthol oil microcapsules in the polyester fiber, leading to a decrease in the mechanical properties and instant coolness value of the cool anti-static polyester fiber. From the comparison of Examples 7, 8, and Example 1, 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 menthol oil microcapsules and the hydroxyl groups on the modified PET, thereby reducing the mechanical properties and instant coolness value of the cool anti-static polyester fiber. From the comparison of Comparative Example 1 and Example 1, it can be seen that adding unmodified PET results in poor anti-static performance of the cool anti-static polyester fiber. From the comparison of Comparative Example 2 and Example 1, it can be seen that directly adding menthol oil reduces the instant coolness value of the cool anti-static polyester fiber. From the comparison of Comparative Example 3 and Example 1, it can be seen that adding unmodified jade powder reduces the mechanical properties and instant coolness value of the cool anti-static polyester fiber.

[0108] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A cooling and antistatic polyester fiber, characterized in that, By weight, it includes the following raw materials: 80-100 parts modified PET, 3-5 parts peppermint oil microcapsules, 5-10 parts modified jade powder, 1-3 parts flame retardant, and 0.5-1 part antioxidant. The method for preparing the modified PET includes the following steps: A1. Add lecithin, hydrogen peroxide and acetic acid to ethanol, react at 55-70℃ for 2-3 hours, and then wash and dry to obtain hydroxylated lecithin. A2. Add terephthalic acid, diol, and catalyst to a reaction vessel, heat to 240-260℃, and react at 0.2-0.3 MPa until the esterification rate is measured to be 99.3-99.7%, then stop the reaction. Add polyethylene glycol, heat to 260-270℃, and react at 0.1-0.2 MPa for 0.5-1.5 h. Add the hydroxylated lecithin obtained in step A1, and react at 100-200 kPa for 0.5-1.5 h. Adjust the pressure to 1-10 kPa and react for 1.5-3.5 h to obtain modified PET. The mass ratio of hydroxylated lecithin to terephthalic acid in step A2 is (0.1-0.3):1; The method for preparing the peppermint essential oil microcapsules includes the following steps: B1. Add the emulsifier and initiator to deionized water and stir at 30-40℃ for 20-30 minutes to obtain the aqueous phase; B2. Add peppermint essential oil and terephthaloyl chloride to cyclohexane and stir at 30-40℃ for 20-30 minutes to obtain the oil phase; B3. Add the oil phase obtained in step B2 to the aqueous phase obtained in step B1, stir at room temperature for 20-30 min, add 20-30 wt% diethylenetriamine cyclohexane solution dropwise under ultraviolet light, react at 30-40℃ for 2-4 h to obtain a suspension, and spray dry the suspension to obtain peppermint essential oil microcapsules. The mass ratio of peppermint essential oil to terephthaloyl chloride is 1:(0.15-0.35). The mass ratio of the terephthaloyl chloride to the cyclohexane solution of 20-30 wt% diethylenetriamine is 1:(2.5-3.5). The method for preparing the modified jade powder includes the following steps: adding jade powder and KH560 silane coupling agent into 95-98wt% ethanol and sonicating for 30-60 min, adding 2,4-toluene diisocyanate and acetone, stirring at 60-70℃ for 2-4 h, cooling to room temperature, and rotary evaporating to obtain the modified jade powder. The mass ratio of the jade powder to the KH560 silane coupling agent is 1:(0.3-0.6). The mass ratio of the jade powder to 2,4-toluene diisocyanate is 1:(0.2-0.5).

2. A method for preparing the cool-feeling antistatic polyester fiber according to claim 1, characterized in that, Includes the following steps: S1. After mixing modified PET, modified jade powder, peppermint oil microcapsules, flame retardant and antioxidant, add them to a twin-screw extruder for extrusion granulation. The feeding speed of the twin-screw extruder is 20-30 rpm and the extrusion temperature is 240-250℃ to obtain masterbatch. S2. The masterbatch obtained in step S1 is melt-spun at a spinning temperature of 200-260℃ and a spinning speed of 1000-2000m / min. After spinning, it is placed at 30-40℃ for 0.5-1.5h, and then heated to 60-70℃ for stretching processing with a stretching ratio of 1.5-2.5 times to obtain cool-feeling antistatic polyester fiber.

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