Preparation method of antibacterial flame-retardant composite carpet base cloth and application of antibacterial flame-retardant composite carpet base cloth in automotive interior carpet

Abstract

The invention belongs to the field of preparation of composite carpet base cloth, and particularly discloses a preparation method of antibacterial flame-retardant composite carpet base cloth and application of the antibacterial flame-retardant composite carpet base cloth in an automotive interior carpet, and the carpet base cloth (100) is formed by interweaving flame-retardant polyester fibers, bio-based fibers and metal wires; the flame-retardant polyester fiber warps form warps (110), the metal wires form wefts (120), and the bio-based fibers form oblique lines (130); the bio-based fiber is prepared by the following steps: in a spinning process, cooling the bio-based fiber to a micro-molten state, then uniformly spraying a plurality of layers of nano-silver ions on the surface of the bio-based fiber, adhering the nano-silver ions to the surface of the bio-based fiber, and then cooling to normal temperature to obtain the bio-based fiber, the bio-based fiber is prepared from the following components in parts by mass: 100 parts of PLA (Polylactic Acid), 15 to 20 parts of polyhydroxyalkanoate and 5 to 10 parts of lignin. The content of the nano silver ions is 5-15 parts; the carpet base cloth is high in strength, good in antibacterial and flame-retardant effects and environmentally friendly.

Description

[0001] This application is a divisional application of the patent with the application date of December 26, 2022, application number CN202211675244.0, and invention name 'Preparation Process and Application of an Antibacterial, Flame-Retardant and High-Strength Composite Carpet Base Fabric'. Technical Field

[0002] The present invention belongs to the field of preparation of composite carpet base fabrics, and specifically discloses a preparation method of an antibacterial and flame-retardant composite carpet base fabric and its application in automotive interior carpets. Background Art

[0003] A carpet is a floor covering made of natural fibers such as cotton, hemp, wool, silk, grass yarns, or chemical synthetic fiber raw materials through hand or mechanical processes of knitting, tufting, or weaving. It is one of the art and craft categories with a long historical tradition worldwide. It covers the floors of residences, hotels, conference rooms, entertainment venues, gymnasiums, exhibition halls, vehicles, ships, airplanes, etc., and has the functions of reducing noise, heat insulation, improving the foot feeling in terms of decoration, preventing slipping, and preventing air pollution. The internal use areas of residences are kitchens, bedrooms, bedside, coffee tables and sofas, bathrooms, and living rooms. The common fiber raw materials for carpet pile yarns are divided into three types: natural fibers, chemical fibers, and blends. Among them, natural fibers include wool, silk, cotton, and jute, etc.; chemical fibers include viscose staple fiber, nylon BCF filament and staple fiber, acrylic staple fiber, polypropylene BCF filament and staple fiber, and polyester staple fiber; blends include wool / nylon, wool / viscose, wool / acrylic, wool / polyester, and wool / jute, etc. Chemical fiber (synthetic fiber) carpets are mainly made of chemical fibers such as nylon fiber (polyamide), polypropylene fiber (polypropylene), polyacrylonitrile fiber (acrylic), polyester fiber (polyester), setting yarn, PTT, etc. Its greatest feature is strong wear resistance, and at the same time, it overcomes the disadvantages of pure wool carpets being easily corroded and mildewed; however, its flame retardancy and antistatic properties are relatively poor. Summary of the Invention

[0004] In order to solve the above problems, the present invention discloses a preparation method of an antibacterial and flame-retardant composite carpet base fabric and its application in automotive interior carpets.

[0005] The technical solution of the present invention is as follows:

[0006] An antibacterial, flame-retardant and high-strength composite carpet base fabric, wherein the carpet base fabric is woven from flame-retardant polyester fibers, bio-based fibers, and metal wires;

[0007] The flame-retardant polyester fibers form the warp, the metal wires form the weft, and the bio-based fibers form the diagonal lines. In this solution, the flame-retardant polyester fibers endow the carpet base fabric with toughness, certain stretchability and flame retardancy, while the metal wires endow the carpet base fabric with high strength and flame retardancy, and the bio-based fibers endow the carpet base fabric with good antibacterial property and toughness. By comprehensively using the weaving scheme of warp and weft crossing and diagonal lines, the finally prepared carpet base fabric has high strength, good flame retardant performance, strong antibacterial performance, and is green and environmentally friendly.

[0008] Further, for the above-mentioned antibacterial and flame-retardant high-strength composite carpet base fabric, the bio-based fibers are prepared by the following steps:

[0009] During the spinning process, the bio-based fibers are cooled to a slightly molten state, and then several layers of nano silver ions are evenly sprayed on the surface of the bio-based fibers and adhered to the surface of the bio-based fibers, and then cooled to room temperature to obtain the bio-based fibers;

[0010] Calculated by mass fraction, the bio-based fibers contain 100 parts of PLA, 15 - 20 parts of polyhydroxyalkanoate, and 5 - 10 parts of lignin; the nano silver ions are 5 - 15 parts. Preferably, the average particle size of the above nano silver ions is 50 nm.

[0011] Further, for the above-mentioned antibacterial and flame-retardant high-strength composite carpet base fabric, the temperature of the slightly molten state is between 155 - 185 °C.

[0012] Further, for the above-mentioned antibacterial and flame-retardant high-strength composite carpet base fabric, a flame-retardant anti-slip glue layer is provided on the lower surface of the carpet base fabric, and several flame-retardant anti-slip glue particles are provided on the lower surface of the flame-retardant anti-slip glue layer, and the several flame-retardant anti-slip glue particles are arranged in a grid array on the lower surface of the flame-retardant anti-slip glue layer. Setting a flame-retardant anti-slip glue layer on the lower surface of the above base fabric enables it to better fit the ground.

[0013] Further, for the above-mentioned antibacterial and flame-retardant high-strength composite carpet base fabric, the angle between the diagonal line and the warp is 45 degrees. Through experiments, it is found that the 45-degree angle structure has the best strength.

[0014] Further, for the above-mentioned antibacterial and flame-retardant high-strength composite carpet base fabric, the metal wire is a magnesium alloy wire. Using magnesium alloy, it has a small density, high strength, a large elastic modulus, and good corrosion resistance.

[0015] Further, for the above-mentioned antibacterial and flame-retardant high-strength composite carpet base fabric, the average diameter of the warp is 50 μm, the average diameter of the weft is 30 μm, and the average diameter of the diagonal line is 40 μm.

[0016] Further, for the preparation method of the above-mentioned antibacterial and flame-retardant high-strength composite carpet base fabric, it includes the following steps:

[0017] S1 Blend the formula amounts of PLA, polyhydroxyalkanoate, and lignin, then add them to the extrusion system. After heating and melting, extrude the spinning melt.

[0018] S2 Feed the spinning melt into the spinning box through the melt transfer pipeline for spinning. The spinning box includes an upper box body, a lower box body, and a spinning component. The spinning melt passes through the upper and lower box bodies and then sprays out a filament bundle from the spinneret plate of the spinning component. The spinning temperature of the upper box body is controlled at 195 - 205 °C, and the spinning temperature of the lower box body is controlled at 210 - 220 °C.

[0019] S3 After the filament bundle passes through the slow cooling device and the monomer suction component below the spinneret plate, it enters the temperature-controlled combined cooling component. Use the hot air blown in a circular pattern and the cold air blown from both sides to slowly cool the filament bundle to a slightly molten state, and then immediately spray several layers of nano silver ions evenly, which adhere to the surface of the bio-based fiber to obtain the as-spun fiber, and then cool it down to below 90 °C.

[0020] S4 Draw and wind the as-spun fiber, control the drawing temperature at 85 - 95 °C, and the drawing speed at 500 - 800 m / min. Finally, obtain the bio-based fiber after winding.

[0021] S5 Use the flame-retardant polyester fiber warp as the warp, the metal wire as the weft, and the bio-based fiber as the diagonal line. Among them, each centimeter 2 The base fabric contains 30 - 50 warp threads, 25 - 35 weft threads, and 20 - 40 diagonal lines. The diagonal lines are symmetrically arranged in an X shape. The above preparation method is simple and the preparation cost is low.

[0022] Further, for the above preparation method of an antibacterial, flame-retardant, and high-strength composite carpet base fabric, the extrusion machine step specifically includes the following steps:

[0023] Extrude on a twin-screw extruder with a length-to-diameter ratio L / D = 24. The twin-screw extruder consists of a total of 6 sections from 1D to 6D and a die head area. Add PLA to the feed port at 1D of the twin-screw extruder, add polyhydroxyalkanoate to the injection port at 2D of the twin-screw extruder, and add lignin to the feed port at 3D of the twin-screw extruder, and finally extrude the spinning melt.

[0024] The temperatures of each extrusion zone are as follows

[0025] The first zone: 120 °C - 130 °C, the second zone: 135 °C - 145 °C

[0026] The third zone: 145 °C - 155 °C, the fourth zone: 155 °C - 165 °C

[0027] The fifth zone: 165 °C - 175 °C, the sixth zone: 175 °C - 185 °C

[0028] The die head area: 180 - 195 °C.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In this solution, the flame-retardant polyester fiber endows the carpet base fabric with toughness, certain stretchability and flame retardancy, while the metal wire endows the carpet base fabric with high strength and flame retardancy, and the bio-based fiber endows the carpet base fabric with good antibacterial property, toughness and mechanical strength. By comprehensively using the weft and warp crossing and diagonal weaving schemes, the finally prepared carpet base fabric has high strength, good flame retardant performance, strong antibacterial performance, and is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a side view schematic diagram of an antibacterial and flame-retardant high-strength composite carpet base fabric in the present invention;

[0032] Figure 2 It is a schematic diagram of the microscopic structure of an antibacterial and flame-retardant high-strength composite carpet base fabric in the present invention;

[0033] Figure 3 It is a schematic diagram of the antibacterial rate in the test example;

[0034] Figure 4 It is a schematic diagram of the tear strength (Mpa) in the test example. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] The reagents or instruments used in the embodiments of the present invention that are not marked with the manufacturer can all be obtained as conventional reagent products through commercial purchase.

[0037] Example 1

[0038] As Figure 1 and 2 shown, an antibacterial and flame-retardant high-strength composite carpet base fabric, wherein the carpet base fabric 100 is woven from flame-retardant polyester fiber, bio-based fiber and metal wire;

[0039] The flame-retardant polyester fiber warp forms the warp 110, the metal wire forms the weft 120, and the bio-based fiber forms the diagonal line 130;

[0040] The bio-based fiber is prepared by the following steps:

[0041] During the spinning process, the bio-based fiber is cooled to a slightly molten state, and then several layers of nano silver ions are evenly sprayed on the surface of the bio-based fiber and adhered to the surface of the bio-based fiber. Subsequently, it is cooled to room temperature to obtain the bio-based fiber;

[0042] Calculated by mass, the bio-based fiber contains 100 parts of PLA, 15 parts of polyhydroxyalkanoate, and 5 parts of lignin; the nano silver ions are 5 parts;

[0043] The temperature of the slightly molten state is between 155 - 185 °C;

[0044] A flame-retardant and anti-slip adhesive layer 200 is provided on the lower surface of the carpet base cloth 100, and several flame-retardant and anti-slip adhesive grains 201 are provided on the lower surface of the flame-retardant and anti-slip adhesive layer. The several flame-retardant and anti-slip adhesive grains 201 are arranged in a grid array on the lower surface of the flame-retardant and anti-slip adhesive layer 200;

[0045] The angle between the diagonal line 130 and the warp 110 is 45 degrees;

[0046] The metal wire is a magnesium alloy wire;

[0047] The average diameter of the warp 110 is 50 μm, the average diameter of the weft 120 is 30 μm, and the average diameter of the diagonal line 130 is 40 μm;

[0048] The preparation method of the above antibacterial, flame-retardant and high-strength composite carpet base cloth includes the following steps:

[0049] S1 Mix the formula amounts of PLA, polyhydroxyalkanoate and lignin, add them to the extrusion machine system, heat and melt them, and then extrude the spinning melt;

[0050] S2 Feed the spinning melt into the spinning box through the melt conveying pipeline for spinning; the spinning box includes an upper box body, a lower box body and a spinning component. The spinning melt passes through the upper and lower box bodies and then sprays out a filament bundle from the spinneret of the spinning component; the spinning temperature of the upper box body is controlled at 195 - 205 °C, and the spinning temperature of the lower box body is controlled at 210 - 220 °C;

[0051] S3 After the filament bundle passes through the slow cooler and monomer suction component below the spinneret, it enters the temperature-controlled combined cooling component. The filament bundle is slowly cooled to a slightly molten state by using the hot air blown by the ring blower and the cold air blown from both sides, and then immediately evenly sprayed with several layers of nano silver ions, which adhere to the surface of the bio-based fiber to obtain the nascent fiber, and then the temperature is lowered to below 90 °C;

[0052] S4 Perform drawing and winding on the nascent fiber, control the drawing temperature at 85 - 95 °C, the drawing speed at 500 - 800 m / min, and finally obtain the bio-based fiber after winding;

[0053] S5 forms warp 110 with flame-retardant polyester fiber warp, weft 120 with the metal wire, and diagonal line 130 with the bio-based fiber; wherein per cm 3 The base fabric contains 30 warps 110, 25 wefts 120, and 20 diagonal lines 130, and the diagonal lines 130 are symmetrically arranged in an X shape.

[0054] The specific steps of step S1 are as follows:

[0055] Extrude on a twin-screw extruder with a length-to-diameter ratio L / O = 24, which consists of a total of 6 sections from 1D to 6D and a die head area; add PLA to the feed port at 1D of the twin-screw extruder, add polyhydroxyalkanoate to the injection port at 2D of the twin-screw extruder, add lignin to the feed port at 3D of the twin-screw extruder, and finally extrude the spinning melt;

[0056] The temperatures of each extrusion zone are as follows

[0057] The first zone is 120°C to 130°C, the second zone is 135°C to 145°C

[0058] The third zone is 145°C to 155°C, the fourth zone is 155°C to 165°C

[0059] The fifth zone is 165°C to 175°C, the sixth zone is 175°C to 185°C

[0060] The die head area is 180 - 195°C.

[0061] Example 2

[0062] An antibacterial, flame-retardant and high-strength composite carpet base fabric, the carpet base fabric 100 is woven from flame-retardant polyester fiber, bio-based fiber and metal wire;

[0063] The flame-retardant polyester fiber warp forms warp 110, the metal wire forms weft 120, and the bio-based fiber forms diagonal line 130;

[0064] The bio-based fiber is prepared by the following steps:

[0065] During the spinning process, cool the bio-based fiber to a slightly molten state, then evenly spray several layers of nano silver ions on the surface of the above bio-based fiber, adhere to the surface of the bio-based fiber, and then cool to room temperature to obtain the bio-based fiber;

[0066] Calculated by mass, the bio-based fiber contains 100 parts of PLA, 18 parts of polyhydroxyalkanoate, 8 parts of lignin; 10 parts of the nano silver ions;

[0067] The temperature of the slightly molten state is between 155 - 185°C;

[0068] The lower surface of the carpet base fabric 100 is provided with a flame-retardant anti-slip glue layer 200, and the lower surface of the flame-retardant anti-slip glue layer is provided with a plurality of flame-retardant anti-slip glue particles 201. The plurality of flame-retardant anti-slip glue particles 201 are arranged in a grid array on the lower surface of the flame-retardant anti-slip glue layer 200;

[0069] The angle between the diagonal line 130 and the warp 110 is 45 degrees;

[0070] The metal wire is a magnesium alloy wire;

[0071] The average diameter of the warp 110 is 50 μm, the average diameter of the weft 120 is 30 μm, and the average diameter of the diagonal line 130 is 40 μm;

[0072] The preparation method of the above antibacterial flame-retardant high-strength composite carpet base fabric includes the following steps:

[0073] S1 Mix the formula amounts of PLA, polyhydroxyalkanoate, and lignin, add them to an extrusion machine system, heat and melt them, and then extrude a spinning melt;

[0074] S2 Feed the spinning melt into a spinning box through a melt delivery pipe for spinning; the spinning box includes an upper box body, a lower box body, and a spinning component. The spinning melt passes through the upper and lower box bodies and then sprays out a filament bundle from the spinneret of the spinning component; the spinning temperature of the upper box body is controlled at 195 - 205 °C, and the spinning temperature of the lower box body is controlled at 210 - 220 °C;

[0075] S3 After the filament bundle passes through a slow cooling device and a monomer suction component below the spinneret, it enters a temperature-controlled combined cooling component. Use the hot air blown by the ring and the cold air blown on both sides to slowly cool the filament bundle to a slightly molten state, and then immediately spray several layers of nano silver ions evenly, which adhere to the surface of the bio-based fiber to obtain a nascent fiber, and then cool it to below 90 °C;

[0076] S4 Perform drawing and winding on the nascent fiber, control the drawing temperature at 85 - 95 °C, and the drawing speed at 500 - 800 m / min, and finally obtain bio-based fiber after winding;

[0077] S5 Use the flame-retardant polyester fiber warp to form the warp 110, the metal wire to form the weft 120, and the bio-based fiber to form the diagonal line 130; among them, each cm 3 The base fabric contains 40 warps 110, 30 wefts 120, and 30 diagonal lines 130, and the diagonal lines 130 are symmetrically arranged in an X shape.

[0078] The specific steps of step S1 include the following steps:

[0079] Extrusion is carried out on a twin-screw extruder with a length-to-diameter ratio L / D = 24. The twin-screw extruder consists of a total of 6 sections from 1D to 6D and a die head section. PLA is added to the feed port at the 1D position of the twin-screw extruder, polyhydroxyalkanoate is added to the injection port at the 2D position of the twin-screw extruder, and lignin is added to the feed port at the 3D position of the twin-screw extruder, and finally, a spinning melt is extruded.

[0080] The temperatures of each extrusion zone are as follows

[0081] The first zone: 120 °C - 130 °C, the second zone: 135 °C - 145 °C

[0082] The third zone: 145 °C - 155 °C, the fourth zone: 155 °C - 165 °C

[0083] The fifth zone: 165 °C - 175 °C, the sixth zone: 175 °C - 185 °C

[0084] The die head zone: 180 - 195 °C.

[0085] Example 3

[0086] An antibacterial, flame-retardant and high-strength composite carpet base fabric, the carpet base fabric 100 is woven from flame-retardant polyester fibers, bio-based fibers and metal wires;

[0087] The flame-retardant polyester fiber warp threads form the warp threads 110, the metal wires form the weft threads 120, and the bio-based fibers form the diagonal threads 130;

[0088] The bio-based fibers are prepared by the following steps:

[0089] During the spinning process, the bio-based fibers are cooled to a slightly molten state, and then several layers of nano silver ions are evenly sprayed on the surface of the bio-based fibers and adhered to the surface of the bio-based fibers, and then cooled to room temperature to obtain the bio-based fibers;

[0090] Calculated by mass fraction, the bio-based fibers contain 100 parts of PLA, 20 parts of polyhydroxyalkanoate, 10 parts of lignin; and 15 parts of the nano silver ions;

[0091] The temperature of the slightly molten state is between 155 - 185 °C;

[0092] A flame-retardant and anti-slip glue layer 200 is provided on the lower surface of the carpet base fabric 100, and a number of flame-retardant and anti-slip glue particles 201 are provided on the lower surface of the flame-retardant and anti-slip glue layer, and the number of flame-retardant and anti-slip glue particles 201 are arranged in a grid array on the lower surface of the flame-retardant and anti-slip glue layer 200;

[0093] The angle between the diagonal threads 130 and the warp threads 110 is 45 degrees;

[0094] The metal wire is a magnesium alloy wire;

[0095] The average diameter of the warp yarn 110 is 50 μm, the average diameter of the weft yarn 120 is 30 μm, and the average diameter of the diagonal yarn 130 is 40 μm;

[0096] The preparation method of the above antibacterial, flame-retardant and high-strength composite carpet base fabric includes the following steps:

[0097] S1 Blend the formulated amounts of PLA, polyhydroxyalkanoate and lignin, then add them to the extrusion machine system, heat and melt them, and then extrude a spinning melt.

[0098] S2 Send the spinning melt through the melt transfer pipeline into the spinning box for spinning; the spinning box includes an upper box body, a lower box body and a spinning component. The spinning melt passes through the upper and lower box bodies and then sprays out a filament bundle from the spinneret of the spinning component; the spinning temperature of the upper box body is controlled at 195 - 205 °C, and the spinning temperature of the lower box body is controlled at 210 - 220 °C.

[0099] S3 After the filament bundle passes through the slow cooling device and the monomer suction component below the spinneret, it enters the temperature-controlled combined cooling component. Use the hot air blown in a circular manner and the cold air blown from both sides to slowly cool the filament bundle to a slightly molten state, and then immediately spray several layers of nano silver ions evenly, which adhere to the surface of the bio-based fiber to obtain the primary fiber, and then cool it down to below 90 °C.

[0100] S4 Perform drawing and winding on the primary fiber, control the drawing temperature at 85 - 95 °C, and the drawing speed at 500 - 800 m / min, and finally obtain the bio-based fiber after winding.

[0101] S5 Use the flame-retardant polyester fiber warp yarns to form the warp yarns 110, the metal wires to form the weft yarns 120, and the bio-based fibers to form the diagonal yarns 130; among them, each cm 3 The base fabric contains 50 warp yarns 110, 35 weft yarns 120, and 40 diagonal yarns 130, and the diagonal yarns 130 are symmetrically arranged in an X shape.

[0102] The specific steps of the step S1 include the following steps:

[0103] Extrude on a twin-screw extruder with a length-to-diameter ratio L / O = 24. The twin-screw extruder consists of a total of 6 sections from 1D to 6D and a die head area; add PLA to the feed port at the 1D position of the twin-screw extruder, add polyhydroxyalkanoate to the injection port at the 2D position of the twin-screw extruder, and add lignin to the feed port at the 3D position of the twin-screw extruder, and finally extrude the spinning melt.

[0104] The temperatures of each extrusion zone are as follows

[0105] The first zone: 120 °C - 130 °C, the second zone: 135 °C - 145 °C

[0106] The third zone is 145°C to 155°C, and the fourth zone is 155°C to 165°C.

[0107] The fifth zone is 165°C to 175°C, and the sixth zone is 175°C to 185°C.

[0108] The die head zone is 180 to 195°C.

[0109] Comparative Example 1

[0110] It does not contain bio-based fibers, and the rest is the same as in Example 2.

[0111] Test Example

[0112] Performance Detection Test

[0113] Detection Method / Test Method

[0114] The test for the antibacterial rate of Escherichia coli was carried out according to the provisions of GB / T20944.2-2007 for the evaluation of the antibacterial properties of textiles. When the antibacterial value ≥ 1 or the antibacterial rate ≥ 90.00%, the sample has antibacterial effect. The results are shown in Table 1 and Figure 3 and Figure 4 as shown.

[0115] Bacteriostasis rate (%) Flame retardant temperature (°C) Tear strength (Mpa) Example 1 97.5 320 15.25 Example 2 98.2 332 16.34 Example 3 99.5 337 17.15 Comparative example 1 85.2 314 10.25

[0116] As shown in Table 1, for an antibacterial, flame-retardant and high-strength composite carpet base fabric of the present invention, the flame-retardant polyester fiber endows the carpet base fabric with toughness, certain stretchability and flame retardancy, while the metal wire endows the carpet base fabric with high strength and flame retardancy, and the bio-based fiber endows the carpet base fabric with good antibacterial property, toughness and mechanical strength. By comprehensively using the weaving schemes of warp and weft crossing and diagonal lines, the finally prepared carpet base fabric has high strength, good flame retardant performance, strong antibacterial performance, and is green and environmentally friendly.

[0117] For the limited several preferred embodiments of the invention, the description is relatively specific and detailed, but it should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A preparation method of an antibacterial and flame-retardant composite carpet base fabric, characterized in that, The following steps are involved: S1. PLA, polyhydroxyalkanoate and lignin in a formulated amount are blended and added to a twin-screw extruder system, wherein PLA is added through a feed port located at 1D, polyhydroxyalkanoate is added through a feed port located at 2D, and lignin is added through a feed port located at 3D; S2 Melt extrusion is carried out in each section of the twin-screw extruder according to the following temperature gradient: The first zone is 120℃~130℃, the second zone is 135℃~145℃, the third zone is 145℃~155℃, the fourth zone is 155℃~165℃, the fifth zone is 165℃~175℃, the sixth zone is 175℃~185℃, and the die zone is 180~195℃; S3 After the molten liquid is ejected from the spinneret of the spinning box, it is cooled to a slightly molten state (155-185°C) by a combination of ring-blowing hot air and double-side blowing cold air, and then 5-15 parts of nano silver ions are sprayed and adhered to the fiber surface to obtain primary fibers; S4: drawing and winding the spun fibers at a drawing temperature of 85 to 95° C. and a drawing speed of 500 to 800 m / min to obtain bio-based fibers; S5 The flame-retardant polyester fiber is used as the warp, the magnesium alloy wire is used as the weft, and the bio-based fiber is used as the diagonal thread to form a composite base fabric containing 30-50 warp threads, 25-35 weft threads, and 20-40 diagonal threads per cm², wherein the diagonal threads are symmetrically arranged in an X shape and have an angle of 45 degrees with the warp threads.

2. The preparation method according to claim 1, characterized in that, The average particle size of the nano silver ions in step S3 is 50 nm.

3. The preparation method according to claim 1, characterized in that, The bio-based fiber comprises, by weight: 100 parts of PLA, 15-20 parts of polyhydroxyalkanoate, and 5-10 parts of lignin.

4. Use of an antibacterial and flame-retardant composite carpet base fabric prepared by the method according to any one of claims 1-3 in an automotive interior carpet.

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