Antibacterial skin care functional polyester fiber and preparation method thereof

Abstract

This invention discloses an antibacterial and skin-care functional polyester fiber and its preparation method. A composite plant extract, including thyme extract, cornflower extract, and lemongrass extract, is ground and mixed with a dispersant to obtain a composite plant extract dispersion. This dispersion is then modified with a hydrophilic modifier to obtain a hydrophilic modified composite plant extract. Raw materials, including polyester chips I, the hydrophilic modified composite plant extract, and fillers, are sequentially blended, extruded using a screw extruder, and pelletized to obtain a masterbatch. The masterbatch and polyester chips II are then melt-spun to obtain a polyester fiber that simultaneously possesses excellent antibacterial, anti-UV, and hydrophilic properties, while also being nourishing, skin-care-friendly, safe, and non-toxic. This method is simple, low-cost, and conducive to industrial production.

Description

Technical Field

[0001] This invention relates to a polyester fiber, particularly to an antibacterial and skin-care functional polyester fiber, and also to a method for preparing the antibacterial and skin-care functional polyester fiber, belonging to the field of synthetic fiber technology. Background Technology

[0002] Antibacterial and skin-care synthetic fibers and textiles have emerged in response to the current focus on safety and health. In certain work and living environments, human skin can be subjected to various adverse effects, such as passive excessive ultraviolet radiation, dryness, skin aging, and poor microcirculation on the skin surface. Polyester fibers are often blended with other fibers to produce bedding textiles and underwear. Therefore, the development of polyester fibers with antibacterial and skin-care functions is highly necessary.

[0003] Currently, many patented technologies for antibacterial polyester fibers have been developed. For example, Chinese patent (publication number CN115262023A) discloses an antibacterial negative ion coffee bean polyester fiber and its preparation method. This requires special modification treatment of coffee bean extract, such as high-power ultrasonic treatment and high-pressure homogenization treatment, which has high equipment requirements and high cost. Chinese patent (CN114164517A) discloses a method for preparing polyester fibers containing honeysuckle, a traditional Chinese medicine with antibacterial, antioxidant, and skin-care properties. The prepared polyester fibers have excellent antibacterial and antioxidant skin-care effects. However, the honeysuckle and wolfberry used are expensive, and the extraction process is complex, requiring multiple extraction and purification processes, and is carried out at a high temperature of 320℃. Chinese patent (CN111962177A) discloses an antibacterial polyester fiber, its preparation method, and its application. It uses coffee charcoal powder modified with nano-silver particles, which is costly and not conducive to large-scale promotion and application. Summary of the Invention

[0004] In view of the shortcomings of existing antibacterial and skin-care polyester fibers, the first objective of this invention is to provide a polyester fiber that simultaneously possesses excellent antibacterial, anti-UV, and hydrophilic properties, while also being nourishing, skin-care-friendly, safe, and non-toxic.

[0005] The second objective of this invention is to provide a simple and low-cost method for preparing antibacterial and skin-care functional polyester fibers.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a method for preparing antibacterial and skin-care functional polyester fibers, which includes the following steps:

[0007] 1) Grind and mix the complex plant extracts, including thyme extract, cornflower extract and lemongrass extract, with a dispersant to obtain a complex plant extract dispersion.

[0008] 2) The composite plant extract dispersion was mixed with a hydrophilic modifier to obtain a hydrophilic modified composite plant extract.

[0009] 3) The raw materials, including polyester chips I, hydrophilic modified composite plant extracts and fillers, are sequentially blended, screw extruded and pelletized to obtain masterbatch;

[0010] 4) The masterbatch and polyester chips II are melt-spun together to obtain the final product.

[0011] The key to this invention lies in the following: Firstly, it utilizes special natural composite plant extracts to modify polyester fibers, endowing them with excellent antibacterial and UV-resistant properties. Thyme extract primarily contains thymol and baicalin, lemongrass extract primarily contains limonene, and cyanidin extract primarily contains cyanidin chloride. These natural active ingredients work synergistically to provide antibacterial benefits, giving the polyester fibers excellent antibacterial function. Simultaneously, the combination of baicalin and cyanidin chloride exhibits good UV-resistant effects. Furthermore, these active ingredients, through melt spinning with polyester chips, can achieve active... The sustained-release effect of the active ingredients ensures that the antibacterial and anti-UV functions of polyester fibers are long-lasting and effective. On the other hand, the natural compound plant extracts have undergone hydrophilic modification and coating modification, which enables them to be highly dispersed in polyester fibers and better exert their effects. By modifying the surface of the compound plant extracts with hydrophilicity, the compatibility between them and polyester and fillers can be increased, which is conducive to the uniform dispersion of the compound plant extracts and can also improve the hydrophilicity of polyester fibers. Furthermore, the use of special fillers to coat the compound plant extracts and other powders increases the smoothness and high temperature resistance of the powder surface, while also facilitating the effectiveness of the compound plant extracts.

[0012] As a preferred embodiment, the compound plant extract is composed of thyme extract, cornflower extract, and lemongrass extract in a mass ratio of 5–7:1–3:2–4. Most preferably, the plant extract is composed of thyme extract, cornflower extract, and lemongrass extract in a mass ratio of 5:2:3. An appropriate ratio of thyme extract, cornflower extract, and lemongrass extract enhances its synergistic antibacterial effect, while the ratio of thyme extract to cornflower extract must reach a certain level to fully exert the anti-UV effect of baicalin.

[0013] As a preferred embodiment, the thyme extract contains 10–500 ppm thymol and baicalin;

[0014] As a preferred embodiment, the lemongrass extract contains 10 to 80 ppm limonene.

[0015] As a preferred embodiment, the cornflower extract contains 5-50 ppm of cyanidin chloride.

[0016] As a preferred embodiment, the plant extracts are obtained by the following method: the extraction methods for thyme extract, cornflower extract, and lemongrass extract are the same. Taking the preparation method of thyme extract as an example: the whole thyme herb is heated to 65°C with 75% ethanol at a solid-liquid ratio of 1 kg:(10-20) L and extracted under 40 kHz ultrasound for 5 hours. The solid and liquid are separated, and the ethanol is replaced with fresh ethanol for extraction. This process is repeated twice, and the three extracts are combined. The ethanol is then distilled to obtain thyme extract. The thyme extract is added to water at a solid-liquid ratio of 1 kg:(20-80) L, cooled, and precipitated. The supernatant is concentrated, spray-dried (inlet air temperature approximately 150°C, outlet air temperature approximately 80°C), pulverized, and sieved (3000-5000 mesh) to obtain thyme extract powder.

[0017] As a preferred embodiment, the dispersant is composed of polyethylene wax, fatty alcohol, and ethylene oxide in a mass ratio of (45-55):(15-25):(25-35). Using this composite dispersant enables high dispersion of the plant extract powder, preventing agglomeration. The fatty alcohol is a C6 or higher fatty alcohol, such as at least one of n-heptyl alcohol, n-octanol, n-nonyl alcohol, n-decanol, and cetyl alcohol.

[0018] As a preferred embodiment, the mass of the dispersant is 1 to 5% of the mass of the compound plant extract.

[0019] As a preferred embodiment, the hydrophilic modifier is prepared by the following method: sulfonated aliphatic polyester and sodium glycocholate are mixed in a weight ratio of 3:1 to 3, then a free radical initiator and an amphiphilic agent are added to initiate a free radical reaction, thereby obtaining the hydrophilic modifier. The amphiphilic agent is composed of sodium glycocholate and sodium taurocholate in a mass ratio of 3:1 to 3. The simultaneous addition of the aliphatic sulfonate and sodium glycocholate in an appropriate proportion can effectively increase the hydrophilic effect. The sulfonated aliphatic polyester is a fast-penetrating agent T (CAS No.: 1639-66-3). The free radical initiator, such as azobisisobutyronitrile, is added at 15-25% of the mass of the sulfonated aliphatic polyester. The amphiphilic agent is added at 5-15% of the mass of sodium glycocholate. The temperature for initiating the free radical reaction is 65-85°C.

[0020] As a preferred embodiment, the mass of the hydrophilic modifier is 20-30% of the mass of the composite plant extract.

[0021] As a preferred embodiment, the filler is composed of nano-silica, sodium dodecyl sulfate, and bromopentane in a mass ratio of (10-20):(20-30):(5-10). The nano-silica in the filler is mainly used to coat the plant extract powder, thereby increasing its high-temperature resistance during high-temperature spinning. Bromopentane, as an intermediate, mainly improves the coating effect of nano-silica on the plant extract powder, and sodium dodecyl sulfate, as an emulsifier, can improve the smoothness of the coated material. Based on this, the filler used in the technical solution of this invention is a composite filler composed of nano-silica, sodium dodecyl sulfate, and bromopentane, mainly used to coat plant extracts and other powders to increase the smoothness and high-temperature resistance of the powder surface. Since the melting temperature of the active ingredient baicalein in plant extracts is between 256 and 271°C, while the melting temperature of thymol is only between 50 and 70°C, using a composite powder to coat the plant powder can effectively mitigate the effects of high temperatures during processing. The proportion of nano-silica in the filler is mainly to meet the coating of plant extract powder, while the proportion of sodium dodecyl sulfate needs to achieve the emulsification effect. However, excessive use will affect the effectiveness of the plant extract, while too little bromopentane intermediate will not easily trigger the coating of nano-silica.

[0022] As a preferred embodiment, the mass ratio of hydrophilic modified composite plant extract, polyester chips I, and filler is 20–40:70–85:5–8. The main component of the above raw materials is polyester chips. The hydrophilic modified plant extract serves as the functional component; insufficient addition will not achieve antibacterial and skin-care effects, while insufficient addition will affect subsequent spinning performance. The filler and dispersant are mainly used to improve the dispersion effect of the hydrophilic modified plant extract and prevent its failure during processing. The proportions of these components should not be too high, as excessively high proportions will affect the spinning effect and the performance of the polyester fiber, while excessively low proportions will reduce the functional performance of the plant extract.

[0023] As a preferred embodiment, the masterbatch mass is 4-7% of the mass of polyester chips II.

[0024] As a preferred embodiment, the blending temperature is 265℃~285℃.

[0025] As a preferred embodiment, the screw extrusion speed is 110–140 rpm.

[0026] As a preferred embodiment, the melt spinning conditions are as follows: the metering pump supply is 700 g / min to 850 g / min, the spinning temperature is 265℃ to 280℃, the spinning speed is 1000 m / min to 2000 m / min, and the draw ratio is 2.0 to 2.5.

[0027] As a preferred embodiment, the polyester is polyethylene terephthalate.

[0028] The present invention also provides an antibacterial and skin-care functional polyester fiber, which is obtained by the preparation method described above.

[0029] The key to the antibacterial and skin-care functional polyester fiber of this invention lies in the use of natural plant extracts to modify the polyester fiber, endowing it with excellent antibacterial and anti-UV properties. Thyme extract mainly contains thymol and baicalin, lemongrass extract mainly contains limonene, and cornflower extract mainly contains cyanidin chloride. These natural active ingredients work synergistically to exert an antibacterial effect, giving the polyester fiber excellent antibacterial properties. Simultaneously, the combination of baicalin and cyanidin chloride exhibits good anti-UV effects, and these active ingredients... By melt spinning with polyester chips, the active ingredients can be released in a sustained manner, making the antibacterial and anti-UV functions of polyester fibers long-lasting and effective. In particular, the plant extracts have undergone hydrophilic modification and coating modification. By surface hydrophilic modification of the plant extracts, their compatibility with polyester and fillers can be increased, which is conducive to the uniform dispersion of these plant extracts and can also improve the hydrophilicity of polyester fibers. By using special fillers to coat the powders such as composite plant extracts, the smoothness of the powder surface and the high temperature resistance are increased, which is also conducive to the effectiveness of the composite plant extracts.

[0030] Compared with existing technologies, the beneficial technical effects of the present invention are as follows:

[0031] The antibacterial and skin-care functional polyester fiber provided by the technical solution of this invention uses a special natural plant extract component composed of thyme, cornflower and lemongrass, which gives the polyester fiber good antibacterial, anti-ultraviolet and hydrophilic properties, and is gentle on the human body, non-irritating, nourishing and skin-care, safe and green.

[0032] The antibacterial and skin-care functional polyester fiber provided by the technical solution of this invention, tested by GB / T 20944.3-2008, shows an antibacterial effect of over 95% against Staphylococcus aureus and Escherichia coli after 100 washes, and over 92% against Candida albicans. Its antibacterial effect is long-lasting, and its UV protection function has a UPF value greater than 50. It can be used in textile fabrics, curtains, underwear, and bedding.

[0033] The technical solution of this invention utilizes special fillers to coat powders such as composite plant extracts to increase the smoothness and high temperature resistance of the powder surface, while also facilitating the effectiveness of the composite plant extracts.

[0034] The method for preparing antibacterial and skin-care functional polyester fibers provided by the present invention uses plant extracts that are easy to obtain and low in cost, and the melt spinning process uses existing conventional processes, which is conducive to expanding production. Detailed Implementation

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0036] The extraction methods for thyme extract, cornflower extract, and lemongrass extract of the present invention are as follows:

[0037] Extraction method of thyme extract: The whole thyme herb was heated to 65°C with 75% ethanol at a solid-liquid ratio of 1 kg: 15 L and extracted for 5 hours under ultrasonic treatment at 40 kHz. The solid and liquid were separated, and the ethanol was replaced with fresh ethanol for extraction. The extraction was repeated twice, and the three extracts were combined. The ethanol was recovered by distillation to obtain thyme extract. The thyme extract was added to water at a solid-liquid ratio of 1 kg: 40 L, cooled and precipitated. The supernatant was concentrated, spray-dried (inlet air temperature of about 150°C, outlet air temperature of about 80°C), pulverized and sieved through a 4000 mesh to obtain thyme extract powder.

[0038] The extraction methods for cornflower extract and lemongrass extract are the same as those described above.

[0039] The hydrophilic modifier in the following examples was prepared by the following method: sulfonated aliphatic polyester and sodium glycocholate were mixed at a weight ratio of 3:2, then 20% of the mass of the sulfonated aliphatic polyester was added as an azobisisobutyronitrile initiator, followed by 10% of the mass of sodium glycocholate as an amphiphilic agent (sodium glycocholate and sodium taurocholate were mixed at a mass ratio of 3:2). The mixture was stirred at 100 r / min for 20 min at 80°C. After stirring, the hydrophilic modifier was obtained.

[0040] Unless otherwise specified, all chemical reagents used in the following examples are conventional commercially available products.

[0041] Example 1

[0042] Step 1: Mix the thyme extract powder, cornflower extract powder and lemongrass extract powder prepared by the above method at a mass ratio of 5:3:2 to obtain a composite plant extract powder.

[0043] Step 2: Grind the compound plant extract powder while continuously adding a compound dispersant during the grinding process. The dispersant is composed of polyethylene wax, n-octanol, and ethylene oxide in a mass ratio of 50:20:30, and the amount of compound dispersant used accounts for 5% (total raw material mass), thus obtaining a compound plant extract powder dispersion.

[0044] Step 3: Mix the composite plant extract powder dispersion with the hydrophilic modifier. The amount of hydrophilic modifier added is 25% of the mass of the composite plant extract powder. Stir at 300 r / min for 30 min to obtain the hydrophilic modified composite plant extract powder.

[0045] Step 4: Add the prepared hydrophilic modified composite plant extract powder to the reactor, stir at 40 r / min for 20 min at 60℃, and add polyethylene terephthalate ((C 10 H8O4)n) was mixed with hydrophilic modified composite plant extract powder and filler (nano silica, sodium dodecyl sulfate and bromopentane in a mass ratio of 15:25:8) at a mass ratio of 7:3:0.5. The mixture was stirred in a high-speed mixer at 1200 rpm for 40 min to obtain a mixture. The mixture was then granulated by a twin-screw extruder at 270℃ with a screw speed of 120 rpm. After filtration, drying and passing through a 100-mesh sieve, masterbatch was obtained.

[0046] Step 5: Add 6% of the PET masterbatch prepared in Step 4 to the PET chips for spinning. The spinning equipment is modified in that the masterbatch feeding method is changed from the original masterbatch-chip blending to injection feeding. An additional feed screw is added to the side of the equipment. Because the specific gravity of plant PET masterbatch is lower than that of ordinary PET chips, a separate screw is used to feed the masterbatch at a fixed speed to ensure uniformity. An injection cylinder is connected to the bottom of the screw feed box. An injection head is set at one end of the injection cylinder, and a hydraulic tension rod is set at the other end. An injection plug is slidably connected to the inner wall of the injection cylinder. The injection method facilitates the mixing of thyme masterbatch into the injection cylinder, effectively and uniformly injecting thyme masterbatch and PET chips into the reaction vessel. The production process follows the polyester chip spinning process and flow, controlling the spinning metering pump supply at 800g / min, the spinning temperature at 275℃, the spinning speed at 2000m / min, and the draw ratio at 2.5 times, ultimately obtaining antibacterial and skin-care functional polyester fiber.

[0047] Step Six: Post-processing: The nascent polyester filament is drawn and spun on a combined drawing machine. After winding, forming, bundle drawing and heat setting, the nascent polyester filament is obtained. This filament is then crimped and cut to obtain antibacterial and skin-care polyester fiber.

[0048] Example 2

[0049] Step 1: Mix the thyme extract powder, cornflower extract powder and lemongrass extract powder prepared by the above method at a mass ratio of 6:2.5:1.5 to obtain a composite plant extract powder.

[0050] Step 2: Grind the compound plant extract powder while continuously adding a compound dispersant during the grinding process. The dispersant is composed of polyethylene wax, cetyl alcohol, and ethylene oxide in a mass ratio of 45:25:30, and the amount of compound dispersant used accounts for 3% (total raw material mass), thus obtaining a compound plant extract powder dispersion.

[0051] Step 3: Mix the composite plant extract powder dispersion with the hydrophilic modifier. The amount of hydrophilic modifier added is 20% of the mass of the composite extract powder. Stir at 300 r / min for 30 min to obtain the hydrophilic modified composite plant extract powder.

[0052] Step 4: Add the prepared hydrophilic modified composite plant extract powder to the reactor, stir at 40 r / min for 20 min at 60℃, and add polyethylene terephthalate ((C 10 H8O4)n) was mixed with hydrophilic modified composite plant extract powder and filler (nano silica, sodium dodecyl sulfate and bromopentane in a mass ratio of 20:20:10) at a mass ratio of 8:2:0.6. The mixture was stirred in a high-speed mixer at 1200 r / min for 40 min to obtain a mixture. The mixture was then granulated by a twin-screw extruder at 270℃ with a screw speed of 120 rpm. After filtration, drying and passing through a 100-mesh sieve, masterbatch was obtained.

[0053] Step 5: Add 6% of the PET masterbatch prepared in Step 4 to the PET chips for spinning. The spinning equipment is modified in that the masterbatch feeding method is changed from the original masterbatch-chip blending to injection feeding. An additional feed screw is added to the side of the equipment. Because the specific gravity of plant PET masterbatch is lower than that of ordinary PET chips, a separate screw is used to feed the masterbatch at a fixed speed to ensure uniformity. An injection cylinder is connected to the bottom of the screw feed box. An injection head is set at one end of the injection cylinder, and a hydraulic tension rod is set at the other end. An injection plug is slidably connected to the inner wall of the injection cylinder. The injection method facilitates the mixing of thyme masterbatch into the injection cylinder, effectively and uniformly injecting thyme masterbatch and PET chips into the reaction vessel. The production process was carried out according to the polyester chip spinning process and flow, controlling the spinning metering pump supply to 750g / min, the spinning temperature to 275℃, the spinning speed to 1500m / min, and the draw ratio to 2.3 times, finally obtaining antibacterial and skin-care functional polyester fiber.

[0054] Step Six: Post-processing: The nascent polyester filament is drawn and spun on a combined drawing machine. After winding, forming, bundle drawing and heat setting, the nascent polyester filament is obtained. This filament is then crimped and cut to obtain antibacterial and skin-care polyester fiber.

[0055] Example 3

[0056] Step 1: Mix the thyme extract powder, cornflower extract powder and lemongrass extract powder prepared by the above method at a mass ratio of 5:2:3 to obtain a composite plant extract powder.

[0057] Step 2: Grind the compound plant extract powder while continuously adding a compound dispersant during the grinding process. The dispersant is composed of polyethylene wax, cetyl alcohol, and ethylene oxide in a mass ratio of 55:20:25, and the amount of compound dispersant used accounts for 3% (total raw material mass), thus obtaining a compound plant extract powder dispersion.

[0058] Step 3: Mix the composite plant extract powder dispersion with the hydrophilic modifier. The amount of hydrophilic modifier added is 28% of the mass of the composite plant extract powder. Stir at 300 r / min for 30 min to obtain the hydrophilic modified composite plant extract powder.

[0059] Step 4: Add the prepared hydrophilic modified composite plant extract powder to the reactor, stir at 40 r / min for 20 min at 60℃, and add polyethylene terephthalate ((C 10 H8O4)n) was mixed with hydrophilic modified composite extract powder and filler (nano silica, sodium dodecyl sulfate and bromopentane in a mass ratio of 15:25:6) at a mass ratio of 8:2:0.6. The mixture was stirred in a high-speed mixer at 1200 r / min for 40 min to obtain a mixture. The mixture was then granulated by a twin-screw extruder at 270℃ with a screw speed of 120 rpm. After filtration, drying and passing through a 100-mesh sieve, masterbatch was obtained.

[0060] Step 5: Add 5% of the PET masterbatch prepared in Step 4 to the PET chips for spinning. The spinning equipment is modified in that the masterbatch feeding method is changed from the original masterbatch-chip blending to injection feeding. An additional feed screw is added to the side of the equipment. Because the specific gravity of plant PET masterbatch is lower than that of ordinary PET chips, a separate screw is used to feed the masterbatch at a fixed speed to ensure uniformity. An injection cylinder is connected to the bottom of the screw feed box. An injection head is set at one end of the injection cylinder, and a hydraulic tension rod is set at the other end. An injection plug is slidably connected to the inner wall of the injection cylinder. The injection method facilitates the mixing of thyme masterbatch into the injection cylinder, effectively and uniformly injecting thyme masterbatch and PET chips into the reaction vessel. The production process was carried out according to the polyester chip spinning process and flow, controlling the spinning metering pump supply to 850g / min, the spinning temperature to 280℃, the spinning speed to 1500m / min, and the draw ratio to 2.3 times, finally obtaining antibacterial and skin-care functional polyester fiber.

[0061] Step Six: Post-processing: The nascent polyester filament is drawn and spun on a combined drawing machine. After winding, forming, bundle drawing and heat setting, the nascent polyester filament is obtained. This filament is then crimped and cut to obtain antibacterial and skin-care polyester fiber.

[0062] Comparative Example 1

[0063] The only difference from Example 3 is that thyme extract powder and lemongrass extract powder were mixed in a mass ratio of 5:3, and cornflower extract powder was not added. This comparative example shows that without cornflower extract powder, the synergistic antibacterial and anti-UV effects are reduced.

[0064] Comparative Example 2

[0065] The only difference from Example 3 is that the cornflower extract powder and lemongrass extract powder were mixed in a mass ratio of 2:3, and thyme extract powder was not added. This comparative example shows that without thyme extract powder, the synergistic antibacterial and anti-UV effects are reduced.

[0066] Comparative Example 3

[0067] The only difference from Example 3 is that the filler is composed of nano-silica and sodium dodecyl sulfate in a mass ratio of 10:25. This comparative example shows that if bromopentane is not added to the filler, the coating effect of the composite plant extract powder is reduced, affecting the overall effectiveness of the powder.

[0068] Table 1 shows the measurement results of the antibacterial properties of samples from Examples 1-3 and Comparative Examples 1-3:

[0069]

[0070]

[0071] Test method: GB / T 20944.3-2008.

[0072] Table 2 shows the UV resistance measurement results of the samples from Example 3 and Comparative Examples 1-2:

[0073]

[0074] The UV resistance performance measurement test method shall comply with GB / T18830-2009.

Claims

1. A method for preparing an antibacterial and skin-care functional polyester fiber, characterized in that: Includes the following steps: 1) Grind and mix the compound plant extracts, including thyme extract, cornflower extract and lemongrass extract, with a dispersant to obtain a compound plant extract dispersion. The compound plant extract is composed of thyme extract, cornflower extract and lemongrass extract in a mass ratio of 5~7:1~3:2~4; The thyme extract contains 10-500 ppm of thymol and baicalin; The lemongrass extract contains 10-80 ppm limonene; The cornflower extract contains 5-50 ppm of cyanidin chloride; 2) The composite plant extract dispersion was mixed with a hydrophilic modifier to obtain a hydrophilic modified composite plant extract; 3) The raw materials, including polyester chips I, hydrophilic modified composite plant extracts and fillers, are sequentially blended, screw extruded and pelletized to obtain masterbatch; the filler is composed of nano silica, sodium dodecyl sulfate and bromopentane in a mass ratio of (10~20):(20~30):(5~10); 4) The masterbatch and polyester chips II are melt-spun together to obtain the final product.

2. The method for preparing an antibacterial and skin-care functional polyester fiber according to claim 1, characterized in that: The dispersant is composed of polyethylene wax, fatty alcohol and ethylene oxide in a mass ratio of (45~55):(15~25):(25~35); the mass of the dispersant is 1~5% of the mass of the compound plant extract.

3. The method for preparing an antibacterial and skin-care functional polyester fiber according to claim 1, characterized in that: The hydrophilic modifier is obtained by the following preparation method: sulfonated aliphatic polyester and sodium glycocholate are mixed in a weight ratio of 3:1~3, and then a free radical initiator and an amphiphilic agent are added to initiate a free radical reaction to obtain the hydrophilic modifier. The amphiphilic agent is composed of sodium glycocholate and sodium taurocholate in a mass ratio of 3:1~3; The mass of the hydrophilic modifier is 20-30% of the mass of the composite plant extract.

4. The method for preparing an antibacterial and skin-care functional polyester fiber according to claim 1, characterized in that: The mass ratio of hydrophilic modified composite plant extract, polyester chips I, and filler is 20~40 : 70~85 : 5~8.

5. The method for preparing an antibacterial and skin-care functional polyester fiber according to claim 1, characterized in that: The mass of the masterbatch is 4-7% of the mass of polyester chips II.

6. The method for preparing an antibacterial and skin-care functional polyester fiber according to claim 1, characterized in that: The blending temperature is 265℃~285℃; The screw extrusion speed is 110~140 rpm.

7. The method for preparing an antibacterial skin-care functional polyester fiber according to claim 1, characterized in that: The conditions for melt spinning are as follows: the metering pump supply is 700 g / min to 850 g / min, the spinning temperature is 265℃ to 280℃, the spinning speed is 1000 m / min to 2000 m / min, and the draw ratio is 2.0 to 2.

5.

8. A polyester fiber with antibacterial and skin-care functions, characterized in that: It is obtained by the preparation method described in any one of claims 1 to 7.

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