Full-drawn yarn with temperature regulation and anti-radiation functions and preparation method thereof

Abstract

This invention pertains to recycled marine plastic fiber materials, specifically relating to a fully drawn filament with temperature regulation and radiation protection functions, and its preparation method. The invention discloses a fully drawn filament filled with nanoporous carbon fiber aerogel, using recycled marine plastic as raw material, undergoing three-channel hot stretching, magnetic field-assisted freeze-drying, and laser-directed localized heating carbonization, and possessing both heat insulation and radiation protection functions. This fully drawn filament comprises a double-layer carbon fiber aerogel structure with a square cross-section arranged from the inside out, and a shell of recycled marine polypropylene fiber. The preparation method is a melt-hot stretching method, with a magnetic field incorporated during the stretching process, followed by freeze-drying, laser-directed heating carbonization, and collection to prepare the fully drawn filament. The product exhibits good and uniform heat insulation and radiation protection performance, and the production cost is within a controllable range.

Description

Technical Field

[0001] This invention pertains to recycled marine plastic fiber materials, specifically relating to a fully drawn yarn with temperature regulation and radiation protection functions and its preparation method. Background Technology

[0002] The recycling and reuse of marine plastics has long been a key focus and challenge in environmental governance and maintenance. On the one hand, the microplastic infiltration of marine plastics into seawater causes significant pollution to the ecological environment. On the other hand, the varying degrees of erosion of plastics in the ocean result in different levels of recycling difficulty, and the applicable fields of recycled materials also differ. Classification and recycling methods are not yet perfect in the field of marine plastic recycling; furthermore, the application areas of recycled plastics are relatively limited compared to traditional polymer materials; and the functionalization directions are not yet specific and comprehensive enough. Existing invention patent number CN201910016337.4, "An Environmentally Friendly Heat-Insulating Plastic Film and Its Preparation Process," mentions preparing environmentally friendly plastic films by adding biodegradable materials such as PLA, but the cost of the added biodegradable materials is relatively high. Existing invention patent number CN202110011334.9, "A Processing Method for Recycled Plastic Particles," provides a method for recycling waste plastics and describes a method for removing impurities using buoyancy; however, the application scope of conventional recycled plastics is relatively narrow and its function is relatively limited. Existing invention patent number CN201910016337.4, "An Environmentally Friendly Heat-Insulating Plastic Film and Its Preparation Process,"... The invention mentions the use of polylactic acid and polybutylene terephthalate (PET) particles to prepare materials with both biodegradable and heat-insulating properties. However, the addition of special materials increases costs, requires stringent production conditions, lacks universality, and fails to accurately assess durability, leading to resource waste. Existing invention patent CN201210195216.9, a method for preparing a microwave-absorbing and radiation-shielding plastic, mentions using radiation-shielding particles such as acetylene carbon powder and carbonyl iron powder to impart radiation-shielding properties to plastics like PP (polypropylene) and PVC (polyvinyl chloride). However, its radiation-shielding capacity is limited, and the particle distribution is difficult to control, potentially leading to uneven radiation shielding and harm to humans or the environment. Existing invention patent CN202021452467.7, a recycling device for polyamide-based marine plastics, proposes a complete method for recycling PA6 / PA66, but it does not mention more modern and practical application areas. Summary of the Invention

[0003] The existing technical problems are as follows:

[0004] 1. Among the existing methods for producing recycled marine plastics, the methods for recycling marine plastics have become more diverse and efficient over time. However, due to the different lengths of time that marine plastics are exposed to seawater, the degree of erosion they suffer is also different. There is a lack of specific and feasible methods for screening marine plastics with different degrees of erosion, which makes the efficiency of existing marine plastic recycling low.

[0005] 2. Recycled plastics are widely welcomed due to their environmentally friendly characteristics, but the limited functionality of PP material itself restricts their application. This makes it difficult to meet the needs of current high-tech industries and reduces the added value of researching and producing recycled plastics.

[0006] 3. Functionalized recycled plastics have been widely welcomed due to their low cost and high durability. However, most of the functions come from the addition of special particles, such as conductive particles and temperature-regulating microcapsules. As a result, problems such as uneven particle application and the shedding and damage of functionalized particles have not been properly solved. This leads to a very short product failure cycle and increases environmental pollution.

[0007] 4. Due to its high efficiency, simple process and low requirements for production environment, the melt hot stretching spinning method is widely used in industrial fields such as the production of industrial products. However, the traditional hot stretching method has low energy utilization and produces products with limited performance and morphology, making it difficult to meet the needs of high-tech fields under real-world conditions.

[0008] 5. Due to its high porosity, aerogel fiber is widely used in the field of thermal insulation. However, its low strength, determined by its spatial structure, greatly limits the application of carbon aerogel fiber. Aerogel fiber with a damaged spatial structure is far inferior to conventional fiber in terms of strength and other functions, which makes the production of aerogel fiber less durable and less adaptable to the environment.

[0009] To address the aforementioned technical problems, this invention proposes a method for centrifugally separating marine plastic slices using ethanol as the separation medium. A three-channel melt-stretching device ensures production efficiency while providing excellent protection for the subsequently prepared carbon fiber aerogel fibers. The nano-sized iron oxide applied to the polyimide component synergistically works with the magnetic field composited on the stretching device to increase the porosity of the polyimide carbon fiber aerogel. The titanium dioxide and silica powders applied during functionalized granulation ensure the thermal insulation and radiation protection properties of the fully stretched filaments. The freeze-dried fully stretched filaments are wound onto a collection device. By utilizing the thermal insulation properties of aerogel fibers and increasing porosity, while also achieving a certain level of strength and durability, the technical solution is provided as follows:

[0010] This invention provides a method for preparing a fully drawn yarn with temperature regulation and radiation protection functions, comprising the following steps:

[0011] S1: Remove impurities from marine plastic chips and dry them to obtain high molecular weight polypropylene chips;

[0012] S2: Mix the high molecular weight polypropylene chips with nano-titanium dioxide and nano-silica, and granulate to obtain polypropylene masterbatch;

[0013] S3: Under a protective atmosphere, the polypropylene masterbatch and polyimide masterbatch are added into a three-layer spinning channel and heated, then extruded to obtain a spinning melt; the polyimide masterbatch is obtained by mixing nano-iron oxide and polyimide;

[0014] The three-layer spinning channel consists of a shell channel and two core channels. The shell channel consists of two arc-shaped channels and a rectangular channel located between the two arc-shaped channels. The two core channels are respectively located between the rectangular channel and the two arc-shaped channels.

[0015] The polypropylene masterbatch is added to the shell layer channel, and the polyimide masterbatch is added to two core layer channels.

[0016] S4: The spinning melt is stretched in a stretching device to obtain the stretched yarn to be processed; the stretching device is equipped with a magnet, which drives the spinning melt to rotate during stretching.

[0017] S5: Freeze-dry the drawn yarn to be processed, wind and collect it to obtain the fully drawn yarn with temperature regulation and radiation protection functions.

[0018] The marine plastic chips are derived from marine recycled plastic waste, mainly plastic bottles, which are mechanically sliced ​​and are mainly composed of recycled polypropylene (PP).

[0019] Preferably, in step S1, the method for removing impurities is to add marine plastic slices to ethanol and then centrifuge them for separation.

[0020] Furthermore, the centrifugation speed is 2800-3200 r / min, and the time is 5 min.

[0021] Preferably, the total amount of nano-titanium dioxide and nano-silica is 8-12 wt% of high molecular weight polypropylene chips.

[0022] Preferably, in step S3, the heating temperature is 220-280℃ and the heating time is 50-70 minutes.

[0023] Preferably, in step S3, the extrusion is performed using a screw extruder with a length-to-diameter ratio of 26-30:1 and a total power of 22-26kW.

[0024] Preferably, in the polyimide masterbatch, the mass ratio of nano-iron oxide to polyimide is 40-50:100.

[0025] Preferably, in step S4, the rotational speed of the magnet is 6° / s, and the magnitude of the magnetic field formed is 34-38B.

[0026] Preferably, in step S5, the freeze-drying temperature is 8-12℃, the air pressure is 0.8-1.0MPa, and the cooling water pressure is 0.1-0.3MPa.

[0027] Preferably, in step S5, the temperature of laser-directed local heating carbonization is 880-920℃.

[0028] In step S5, the extruded nascent fiber is directionally irradiated by a carbon dioxide laser (Synrad high-performance carbon dioxide laser, power 5-400W) for local carbonization (Li Xiaoxia. Experimental study on carbon dioxide laser melting and heating process of quartz optical fiber [J]. Information Recording Materials, 2022, 23(6):3.). The carbon dioxide laser can emit carbon dioxide molecular laser light. It includes a discharge tube, a working electrode, and a working gas (usually a mixture of carbon dioxide and other inert gases). When a high voltage (usually DC or low-frequency AC) is applied to the electrode, glow discharge is generated in the discharge tube, and laser output is generated at one end of the germanium mirror. The wavelength is in the mid-infrared band around 10.6 micrometers. By adjusting the input voltage, the power of the laser can be adjusted to control the carbonization temperature.

[0029] The present invention also provides a fully drawn yarn with temperature regulation and radiation protection functions prepared by the above preparation method.

[0030] The technical solution of the present invention has the following advantages compared with the prior art:

[0031] 1. The recycled marine plastic fiber mentioned in this invention has the characteristics of low cost, high strength and low production conditions, which reduces the environmental pollution caused by the production of polymer materials. The equipment used to screen and separate marine plastic chips can screen out the parts that do not meet the production requirements based on the degree of erosion of the marine plastic, and reduce the phenomenon of broken filaments generated during the stretching process.

[0032] 2. The three-channel square cross-section molten hot stretch spinneret used in this invention allows the components of the two spinning melts to be distributed in a core-shell structure. Compared with blending, the structure provided by this invention makes the product's functional distribution more uniform. At the same time, the recycled PP fiber in the shell layer plays a certain protective role for the carbon fiber aerogel fiber in the core layer, overcoming the drawback of insufficient strength of the carbon fiber aerogel itself.

[0033] 3. The magnetic field composite stretching device mentioned in this invention can work synergistically with the magnetic iron oxide powder mixed in polyimide. During the stretching process, the magnetic powder is subjected to vibration by the magnetic field, which increases the porosity of the carbon fiber aerogel.

[0034] 4. The laser-guided local carbonization method used in this invention can ensure the carbonization effect while avoiding the yellowing or performance reduction of the recycled PP material in the shell due to high temperature. At the same time, the carbon dioxide laser used has low energy consumption, high heating efficiency, and good carbonization uniformity, which greatly improves the shortcomings of traditional carbonization technology that is difficult to carry out locally and improves production efficiency.

[0035] 5. The functionalized granulation process mentioned in this invention adds 10% by mass of titanium dioxide and silicon dioxide powder to the shell material, which gives the recycled polypropylene (PP) better heat insulation and radiation protection functions. Since the powder diameter reaches the nanometer level, it is easy to distribute evenly in the PP melt. Attached Figure Description

[0036] Figure 1 This is a flowchart of the entire preparation process;

[0037] Figure 2 This is a structural diagram of the feeding and extrusion unit;

[0038] Figure 3 This is a structural diagram of the tensioning and traction device;

[0039] Figure 4 This is a cross-sectional view of recycled marine plastic fiber.

[0040] Explanation of reference numerals in the attached drawings: 1-Feeding device, 2-Screw, 3-Three-channel melt-heat stretching channel, 4-Extruded nascent fiber, 5-Two-layer core channel, 6-Shell channel, 7-Nasal fiber, 8-Drying stretching channel, 9-Collection device, 10-Magnet, 11-Stretching and drying device, 12-Regenerated modified PP fiber layer, 13-Aerogel shielding layer. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0042] The three-channel molten hot stretching channel 3 consists of a shell channel 6 and two core channel layers 5. The shell channel 6 consists of two arc-shaped channels and a rectangular channel located between the two arc-shaped channels; while the two core channel layers 5 are located between the rectangular channel and the two arc-shaped channels, respectively.

[0043] Example 1

[0044] Marine plastic chips were immersed in 99% ethanol and centrifuged at 3000 r / min. The sieve screen was opened to remove plastic chips floating on the surface. After hot air drying, the upper layer of lower molecular weight plastic chips was removed by the sorting screen. The lower layer of chips was dried and then functionalized and granulated. Nano-sized titanium dioxide and silica powder were added at 10% of the recycled PP mass; nano-sized iron oxide powder was added to the polyimide at 45% of the polyimide mass, and the mixture was thoroughly mixed. The functionalized polymer masterbatch was transferred into the shell and core layers of a three-layer spinning channel, with the PP masterbatch entering the shell channel and the polyimide masterbatch entering the core channel. The mixture was heated to 900℃ for 1 min under an argon atmosphere. Extrusion was then performed using a screw extruder with a length-to-diameter ratio of 28:1 and a total power of 24 kW. After extrusion, the spun melt enters a cooling and stretching device with a magnetic field. A magnet placed in the middle layer of the outer wall of the device rotates clockwise at a speed of 6° / s, and the spun melt is stretched and cooled under the action of gravity. The device is 1m long. Afterwards, it undergoes directional localized carbonization using a carbon dioxide laser at a carbonization temperature of 880℃. The fully stretched and cooled filaments are then wound onto a collecting device.

[0045] Example 2

[0046] Based on Example 1, the amount of silica and titanium dioxide powder added to the shell layer of the recycled PP masterbatch was changed to 5% of the recycled PP. Marine plastic chips were immersed in 99% ethanol and centrifuged at 3000 r / min. The screen was opened to remove plastic chips floating on the surface of the medium. After hot air drying, the upper layer of lower molecular weight plastic chips was removed by the sorting screen. The lower layer of chips was dried and then functionalized and granulated. Nano-sized titanium dioxide and silica powder were added to the granules at 5% of the recycled PP mass; nano-sized iron oxide powder was added to the polyimide at 45% of the polyimide mass, and the mixture was thoroughly mixed. The functionalized polymer masterbatch was transferred to the shell and core layers of a three-layer spinning channel, with the PP masterbatch entering the shell channel and the polyimide masterbatch entering the core channel. The mixture was heated to 900°C for 1 min under an argon atmosphere. The mixture was then extruded using a screw extruder with a length-to-diameter ratio of 28:1 and a total power of 24 kW. After extrusion, the spun melt enters a cooling and stretching device with a magnetic field. A magnet placed in the middle layer of the outer wall of the device rotates clockwise at a speed of 6° / s, and the spun melt is stretched and cooled under the action of gravity. The device is 1m long. Afterwards, it undergoes directional localized carbonization using a carbon dioxide laser at a carbonization temperature of 880℃. The fully stretched and cooled filaments are then wound onto a collecting device.

[0047] Example 3

[0048] Based on Example 1, the amount of nano-ferric oxide powder added to the polyimide powder was changed to 15% of the polyimide mass. Marine plastic chips were immersed in 99% ethanol and centrifuged at 3000 r / min. The sieve screen was opened to remove plastic chips floating on the surface of the medium. After hot air drying, the upper layer of lower molecular weight plastic chips was removed by the sorting screen. The lower layer of chips was dried and then functionalized and granulated. Nano-sized titanium dioxide and silica powder were added to the granules at 10% of the recycled PP mass; nano-sized ferric oxide powder was added to the polyimide at 15% of the polyimide mass, and the mixture was homogeneous. The functionalized polymer masterbatch was transferred into the shell and core layers of a three-layer spinning channel, with the PP masterbatch entering the shell channel and the polyimide masterbatch entering the core channel. The mixture was heated to 900°C for 1 min under an argon atmosphere. The mixture was then extruded using a screw extruder with a length-to-diameter ratio of 28:1 and a total power of 24 kW. After extrusion, the spun melt enters a cooling and stretching device with a magnetic field. A magnet placed in the middle layer of the outer wall of the device rotates clockwise at a speed of 6° / s, and the spun melt is stretched and cooled under the action of gravity. The device is 1m long. Afterwards, it undergoes directional localized carbonization using a carbon dioxide laser at a carbonization temperature of 880℃. The fully stretched and cooled filaments are then wound onto a collecting device.

[0049] Example 4

[0050] Based on Example 1, the screw extruder heating temperature was changed to 500℃. Marine plastic chips were immersed in 99% ethanol and centrifuged at 3000 r / min. The screening screen was opened to remove plastic chips floating on the surface of the medium. After hot air drying, the upper layer of lower molecular weight plastic chips was removed by the sorting screen. The lower layer of chips was dried and then functionalized and granulated. Nano-sized titanium dioxide and silica powder were added, at an amount of 10% of the recycled PP mass; nano-sized iron oxide powder was added to the polyimide, at an amount of 45% of the polyimide mass, and the mixture was homogeneous. The functionalized polymer masterbatch was transferred into the shell and core layers of a three-layer spinning channel, with the PP masterbatch entering the shell channel and the polyimide masterbatch entering the core channel. The mixture was heated to 500℃ under an argon atmosphere for 1 min. The mixture was then extruded using a screw extruder with a length-to-diameter ratio of 28:1 and a total power of 24 kW. After extrusion, the spun melt enters a cooling and stretching device with a magnetic field. A magnet placed in the middle layer of the outer wall of the device rotates clockwise at a speed of 6° / s, and the spun melt is stretched and cooled under the action of gravity. The device is 1m long. Afterwards, it undergoes directional localized carbonization using a carbon dioxide laser at a carbonization temperature of 880℃. The fully stretched and cooled filaments are then wound onto a collecting device.

[0051] Comparative Example 1

[0052] Based on Example 1, the centrifugal sieving process using ethanol as the medium was removed. Marine plastic chips were dried and then functionalized and granulated. Nano-sized titanium dioxide and silica powder were added, at an amount of 10% of the recycled PP mass; nano-sized iron oxide powder was added to the polyimide, at an amount of 45% of the polyimide mass, and the mixture was homogeneous. The functionalized polymer masterbatch was transferred into the shell and core layers of a three-layer spinning channel, with the PP masterbatch entering the shell channel and the polyimide masterbatch entering the core channel. The mixture was heated to 900°C for 1 minute under an argon atmosphere. Extrusion was performed using a screw extruder with a length-to-diameter ratio of 28:1 and a total power of 24 kW. After extrusion, the spun melt entered a magnetic field-composite cooling and stretching device. A magnet placed in the middle layer of the outer wall of the device rotated clockwise at a speed of 6° / s, and the spun melt was stretched and cooled under gravity. The device length was 1 m. Finally, directional localized carbonization was performed using a carbon dioxide laser at a carbonization temperature of 880°C. The fully drawn filaments, after cooling and stretching, are wound onto a collecting device.

[0053] Comparative Example 2

[0054] Based on Example 1, coaxial melt-spinning was performed using a hot-drawing needle. Marine plastic chips were immersed in 99% ethanol and centrifuged at 3000 rpm. The screen was opened to remove floating chips. After hot air drying, the upper layer of lower molecular weight chips was removed by the sorting screen. The lower layer of chips was dried and then functionalized and granulated. Nano-sized titanium dioxide and silica powder were added at 10% of the recycled PP mass; nano-sized iron oxide powder was added to the polyimide at 45% of the polyimide mass, and the mixture was thoroughly mixed. The functionalized polymer masterbatches were transferred to the shell and core layers of the coaxial melt-spinning channel, with the PP masterbatch entering the shell channel and the polyimide masterbatch entering the core channel. The mixture was heated to 900°C for 1 minute under an argon atmosphere. The mixture was then extruded using a screw extruder with a length-to-diameter ratio of 28:1 and a total power of 24 kW. After extrusion, the spun melt enters a cooling and stretching device with a magnetic field. A magnet placed in the middle layer of the outer wall of the device rotates clockwise at a speed of 6° / s, and the spun melt is stretched and cooled under the action of gravity. The device is 1m long. Afterwards, it undergoes directional localized carbonization using a carbon dioxide laser at a carbonization temperature of 880℃. The fully stretched and cooled filaments are then wound onto a collecting device.

[0055] Comparative Example 3

[0056] Based on Example 1, the cooling and stretching device was changed to a traditional stretching device without magnets. Marine plastic chips were immersed in 99% ethanol and centrifuged at 3000 r / min. The screening screen was opened to remove plastic chips floating on the surface of the medium. After hot air drying, the upper layer of lower molecular weight plastic chips was removed by the rising sorting screen. The lower layer of chips was dried and then functionalized and granulated. Nano-sized titanium dioxide and silica powder were added to the granules at 10% of the mass of recycled PP; nano-sized iron oxide powder was added to the polyimide at 45% of the mass of polyimide, and the mixture was homogeneous. The functionalized polymer masterbatch was transferred into the shell and core layers of a three-layer spinning channel, with the PP masterbatch entering the shell channel and the polyimide masterbatch entering the core channel. The mixture was heated to 900°C for 1 min under an argon atmosphere. The mixture was then extruded using a screw extruder with a length-to-diameter ratio of 28:1 and a total power of 24 kW. After extrusion, the spinning melt enters a cooling and stretching device, where it is stretched and cooled under gravity. The device is 1 meter long. Then, it undergoes directional, localized carbonization using a carbon dioxide laser at a temperature of 880°C. The fully stretched and cooled filaments are then wound onto a collecting device.

[0057] Effect Evaluation 1

[0058] 1. The test method for thermal insulation performance used in this invention is based on GB / T 39074-2020 Test and evaluation of thermal insulation performance of textiles. 25 fibers are placed crosswise to form a fabric plane. Under a certain pressure, the sample plane is in contact with a hot plane with a certain temperature. After a specified time, the temperature of the other surface of the sample is tested, and the amount of temperature change is calculated and recorded as ΔT. The thermal insulation performance of the sample material is evaluated in this way.

[0059] 2. The radiation protection performance testing method used in this invention is based on "T / CTES1010-2018 Test Method for Electromagnetic Radiation Protection Performance of Textiles". Specifically, under certain temperature and humidity conditions, the sample is placed between a signal source and a signal receiver. The signal intensity obtained is compared with the signal intensity without the sample, and the signal attenuation rate is calculated.

[0060]

[0061] 3. The fiber breaking strength test method used in this invention is based on "GBT14344-93-Test method for breaking strength and breaking elongation of synthetic fiber filaments and textured yarns". The sample fiber webbing is placed on a tensile tester and stretched until it breaks. The strength at the breaking point is the fiber breaking strength F.

[0062] 4. The method for testing fiber porosity used in this invention is based on the standard ISO_TR 26946-2011. Porosity is determined by preparing a cross-section of the coating area to be inspected with high microscopic surface quality. The porosity of the coating under test is quantitatively evaluated using image analysis techniques on a microscope. The percentage of the observed pore portion to the total volume is the porosity.

[0063] 5. The fiber durability test method used in this invention is based on the standard GB / T 37635-2019 Textiles Elastic Webbing Fatigue Resistance Appearance Change Test Method. The specific operation is to clamp the sample on the fatigue resistance tester, stretch it 1000 times under specified conditions, evaluate its tensile breaking strength F' and compare it with the tensile breaking strength F before stretching.

[0064] Table 1 Performance test data for examples and comparative examples

[0065]

[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing a fully drawn yarn with temperature regulation and radiation protection functions, characterized in that, Includes the following steps: S1: Remove impurities from marine plastic chips and dry them to obtain high molecular weight polypropylene chips; S2: Mix the high molecular weight polypropylene chips with nano-titanium dioxide and nano-silica, and granulate to obtain polypropylene masterbatch; S3: Under a protective atmosphere, the polypropylene masterbatch and polyimide masterbatch are added into a three-layer spinning channel and heated, then extruded to obtain a spinning melt; the polyimide masterbatch is obtained by mixing nano-iron oxide and polyimide; The three-layer spinning channel consists of a shell channel and two core channels. The shell channel consists of two arc-shaped channels and a rectangular channel located between the two arc-shaped channels. The two core channels are respectively located between the rectangular channel and the two arc-shaped channels. The polypropylene masterbatch is added to the shell layer channel, and the polyimide masterbatch is added to two core layer channels. S4: The spinning melt is stretched in a stretching device to obtain the stretched yarn to be processed; the stretching device is equipped with a magnet, which drives the spinning melt to rotate during stretching; the rotation speed of the magnet is 6° / s, and the magnetic field size is 34-38B. S5: Freeze-dry the drawn wire to be processed, carbonize it by laser-directed precise heating, and then wind and collect it to obtain the fully drawn wire with temperature regulation and radiation protection functions; the laser-directed heating device used is a carbon dioxide laser with a wavelength of 1060nm.

2. The preparation method according to claim 1, characterized in that, In step S1, the method for removing impurities is to add marine plastic slices to ethanol and then centrifuge them to separate them.

3. The preparation method according to claim 1, characterized in that, The total amount of nano-titanium dioxide and nano-silica is 8-12 wt% of high molecular weight polypropylene chips.

4. The preparation method according to claim 1, characterized in that, In step S3, the heating temperature is 220-280℃ and the time is 50-70 minutes.

5. The preparation method according to claim 1, characterized in that, In step S3, the extrusion is performed using a screw extruder with a length-to-diameter ratio of 26-30:1 and a total power of 22-26kW.

6. The preparation method according to claim 1, characterized in that, In the polyimide masterbatch, the mass ratio of nano-iron oxide to polyimide is 40-50:

100.

7. The preparation method according to claim 1, characterized in that, In step S5, the freeze-drying temperature is 8-12℃, the air pressure is 0.8-1.0MPa, and the cooling water pressure is 0.1-0.3MPa.

8. A fully drawn yarn with temperature regulation and radiation protection functions prepared by the preparation method according to any one of claims 1-7.

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