Fiber for anti-radiation fabric and preparation method thereof

Abstract

The invention relates to the technical field of textiles, and particularly discloses a fiber for an anti-radiation fabric and a preparation method of the fiber. The fiber for the anti-radiation fabric comprises the following raw materials: polyester chips and a composite anti-radiation modifier, the preparation method of the composite anti-radiation modifier comprises the following steps: performing plasma treatment on polyester staple fibers to obtain activated polyester fibers; the preparation method comprises the following steps: dispersing montmorillonite in deionized water, carrying out ultrasonic dispersion to form a suspension, sequentially adding nano tin antimony oxide and nano zinc oxide, and continuously carrying out ultrasonic dispersion to obtain a mixed solution A; adding a silane coupling agent and polytetrafluoroethylene into absolute ethyl alcohol, and performing ultrasonic dispersion to obtain a mixed solution B; adding the activated polyester fiber into the mixed solution A, stirring for reaction, then dropwise adding the mixed solution B, and after dropwise adding, carrying out constant-temperature ultrasonic reaction; and drying, crushing and sieving to obtain the composite anti-radiation modifier. The fiber for the anti-radiation fabric prepared by the invention has excellent anti-radiation performance, good mechanical property and excellent washing fastness.

Description

Technical Field

[0001] This application relates to the field of textile technology, and more specifically, to a fiber for radiation-proof fabric and a method for preparing the same. Background Technology

[0002] With the rapid development of electronic information technology, the communications industry, and medical equipment, electromagnetic radiation has become the fourth major environmental hazard after air pollution, water pollution, and noise pollution. Electromagnetic radiation not only poses potential harm to the human nervous, endocrine, and reproductive systems, causing symptoms such as dizziness, insomnia, and weakened immunity, but it can also interfere with the normal operation of precision electronic equipment, affecting information security and equipment stability. Against this backdrop, textile fabrics with highly effective radiation protection have become a market hotspot. Radiation-resistant fibers, as the core substrate of these fabrics, directly determine the fabric's radiation protection effect, wearing comfort, and lifespan.

[0003] Existing radiation-shielding fibers are mainly divided into three categories: metal-based radiation-shielding fibers, conductive polymer-based radiation-shielding fibers, and inorganic powder-modified radiation-shielding fibers. Metal-based radiation-shielding fibers are prepared by blending metal wires with ordinary fibers or by depositing a metal film on the fiber surface using metal plating technology. These fibers utilize the high conductivity of metals to reflect and shield electromagnetic radiation, offering advantages such as high shielding effectiveness and a wide response frequency band. However, due to the high proportion of metal components, the fibers and fabrics are heavy, lack flexibility, and have poor wearing comfort; the metal wires are prone to breakage, and the plating is easily oxidized and peels off, leading to severe performance degradation; furthermore, the cost of metal raw materials is high, and the processing technology is complex, making large-scale lightweight production difficult. Conductive polymer-based radiation-shielding fibers are prepared by doping conductive polymer materials into the fiber matrix. They rely on the conjugated π-bond system of the conductive polymers to achieve charge transport and radiation shielding. These fibers are lightweight, flexible, and offer a superior wearing experience compared to metallic fibers. However, they suffer from poor radiation protection stability: the conductivity of conductive polymers is easily affected by environmental humidity and temperature, and their conductivity tends to decrease after long-term storage or washing, leading to a decline in radiation protection effectiveness. Furthermore, the synthesis process of conductive polymers is complex, requires high purity, and has high production costs. Some conductive polymer materials also exhibit poor biocompatibility and are prone to aging, limiting their application in close-fitting textiles. Inorganic powder-modified radiation-protective fibers are currently the most widely researched and applied type, prepared by blending inorganic radiation-protective powders with a fiber matrix through spinning. These fibers offer advantages such as lower cost, ease of large-scale production, and high wearing comfort. However, they suffer from poor compatibility between the powder and matrix interface, easy agglomeration leading to decreased mechanical properties, high addition levels resulting in a stiff feel and poor breathability, as well as difficulties in dispersibility control, poor performance uniformity, and poor washability.For example, patent application CN103526329A discloses a method for manufacturing radiation-resistant fiber, including the following steps: (1) mixing and drying radiation-resistant nanopowder with fiber aggregate, adding polymer spinning aid, entering a screw extruder for melt blending and extrusion, granulation, and obtaining radiation-resistant nanopowder masterbatch; (2) mixing radiation-resistant nanopowder masterbatch and fiber chips, and then spinning, winding, and stretching to form radiation-resistant fiber; the radiation-resistant nanopowder is composed of the following components by weight: 10-15 parts graphite, 40-50 parts nano iron oxide, and 10-15 parts nano iron powder; the polymer spinning aid is an alumina zirconate coupling agent, but it can only partially improve the nanopowder. The interfacial bonding between iron oxide and organic fiber matrix cannot fundamentally solve the defects of nanoparticle dispersion and interfacial compatibility: on the one hand, the coupling agent has extremely poor compatibility with surface inert graphite, can only physically adsorb it and cannot overcome its tendency to agglomerate, and at the same time, the total proportion of nanoparticles far exceeds its dispersion carrying capacity threshold, and high proportion of particles will still form micron-sized agglomerates; on the other hand, the solution lacks the synergistic effect of dispersant, cannot suppress dynamic agglomeration during melt blending and spinning, and the coupling agent does not have antioxidant function, and the nano-iron powder is easily oxidized at high temperature, destroying the interfacial bonding, which will ultimately lead to the clogging of the spinneret orifice during spinning, high fiber breakage rate, discontinuous shielding network of the product, and poor mechanical properties and stability. Summary of the Invention

[0004] In order to develop a functional fiber that combines excellent radiation protection performance, good mechanical properties and excellent washability, this application provides a fiber for radiation protection fabric and a method for preparing the same.

[0005] In a first aspect, this application provides a fiber for radiation-proof fabrics, employing the following technical solution: A fiber for radiation-proof fabric comprises the following raw materials in parts by weight: 82-90 parts polyester chips and 10-18 parts composite radiation-proof modifier; the preparation method of the composite radiation-proof modifier includes the following steps: (1) 100 parts by weight of polyester staple fiber were plasma treated at 100-150W power for 5-10 minutes to obtain activated polyester fiber; (2) Disperse 2-5 parts by weight of montmorillonite in 20-80 parts by weight of deionized water by ultrasonic dispersion to form a suspension, then add 3-6 parts by weight of nano-tin antimony oxide and 1-3 parts by weight of nano-zinc oxide in sequence, and continue ultrasonic dispersion to obtain mixture A; add 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene to 10-30 parts by weight of anhydrous ethanol, and ultrasonically disperse to obtain mixture B; (3) Add activated polyester fibers to mixture A and stir at 40-60℃ for 30-40 min. Then add mixture B dropwise. After the addition is complete, perform a constant temperature ultrasonic reaction for 60-90 min. Dry, pulverize and sieve to obtain composite radiation-proof modifier.

[0006] By adopting the above technical solution, inorganic radiation-shielding powders of montmorillonite, nano-tin antimony oxide, and nano-zinc oxide are chemically bonded with a silane coupling agent and physically coated with polytetrafluoroethylene (PTFE), successfully loaded onto the surface of polyester staple fibers to form stable powder-fiber composite units. This solves the problem of poor dispersibility and easy agglomeration of inorganic powders in organic polyester matrices, achieving uniform and stable dispersion of the powders, improving the effective utilization rate of the radiation-shielding powders, and achieving excellent and stable radiation protection effects. Secondly, the introduction of PTFE not only utilizes its hydrophobicity to form a protective layer on the fiber and powder surfaces, effectively blocking water penetration and reducing powder shedding during washing, significantly improving the washability and performance durability of the fabric, but also reduces interfacial stress and minimizes the negative impact of the powders on the mechanical properties of the fibers. Finally, through the synergistic effect of the components, this solution produces functional fibers with excellent radiation protection performance, good mechanical properties, and excellent washability.

[0007] Preferably, in step (1), 100 parts by weight of polyester staple fiber are placed in a plasma treatment instrument and treated for 5-10 minutes at a mixed gas atmosphere of oxygen and argon with a volume ratio of (8-10):1, at 100-150W and a vacuum degree of 0.08-0.1MPa. After treatment, the fiber is ultrasonically cleaned with anhydrous ethanol and dried to obtain activated polyester fiber.

[0008] By adopting the above technical solutions, on the one hand, oxygen can efficiently introduce active groups such as hydroxyl and carboxyl groups onto the fiber surface, while argon can enhance plasma activity and improve the grafting efficiency of active groups, synergistically increasing the active sites and roughness of the fiber surface; on the other hand, the newly added anhydrous ethanol ultrasonic cleaning and drying steps can thoroughly remove impurities, plasma reaction residues, and loose attachments from the treated fiber surface, avoiding interference from impurities in the subsequent powder loading process. At the same time, the drying treatment can ensure that the fiber surface is dry and clean, providing better surface conditions for the subsequent adsorption of powder in mixture A and chemical bonding with coupling agent in mixture B, significantly improving the bonding strength between powder and fiber, reducing the risk of nanoparticle detachment during subsequent spinning and washing processes, and ensuring the performance stability of radiation-proof fibers.

[0009] Preferably, step (1) further includes modification treatment, specifically: the obtained activated polyester fiber is placed in 50-60 parts by weight of deionized water, 0.3-0.6 parts by weight of dopamine is added and the pH of the system is adjusted to 8.5-9.0, and the reaction is stirred for 0.5-1.5h; after the reaction is completed, the fiber is filtered, washed and dried to obtain dopamine modified activated polyester fiber.

[0010] By adopting the above technical solution, dopamine modification treatment can form a polydopamine (PDA) bonding layer on the surface of activated polyester fibers. The amino and hydroxyl functional groups in PDA molecules can form a strong bond with the active groups on the fiber surface, while providing abundant adsorption sites for subsequent inorganic powders. Through the combination of physical adsorption and chemical action, the interfacial bonding strength between powder and fiber is significantly improved. In addition, the PDA coating can also enhance the hydrophilicity and compatibility of the fiber surface, further improve the powder dispersibility, reduce the risk of nanoparticles falling off during subsequent spinning, stretching and washing, ensure the long-term stability of the radiation-proof fiber performance, and reduce the negative impact of powder agglomeration on the fiber mechanical properties.

[0011] Preferably, in step (2), 2-5 parts by weight of organically modified montmorillonite are dispersed in 20-80 parts by weight of deionized water, 0.3-0.5 parts by weight of polyethylene glycol are added, and ultrasonic dispersion is performed to form a suspension. Then, 3-6 parts by weight of nano-tin antimony oxide and 1-3 parts by weight of nano-zinc oxide are added sequentially, and ultrasonic dispersion is continued to obtain mixture A. 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene are added to 10-30 parts by weight of anhydrous ethanol, and ultrasonic dispersion is performed to obtain mixture B. The method for preparing the organically modified montmorillonite is as follows: montmorillonite and hexadecyltrimethylammonium bromide are stirred and reacted in deionized water at 75-85℃ for 1.5-2.5h, and then filtered and dried.

[0012] By adopting the above technical solution, after organic modification with hexadecyltrimethylammonium bromide, hydrophobic long-chain alkyl groups are introduced into the surface of montmorillonite, which significantly reduces the surface hydrophilicity and significantly improves the compatibility with the organic matrix, polytetrafluoroethylene (PTFE) micropowder, and dopamine coating, thereby reducing agglomeration from the root. At the same time, the organic modifier molecules are inserted into the interlayer of montmorillonite sheets, which can expand the interlayer distance and form more loading sites, effectively adsorbing and fixing nano-inorganic powders and constructing a layered loading-spatial barrier composite structure. In addition, the interaction between the functional groups on the surface of modified montmorillonite and silane coupling agent and PDA coating is enhanced, which can further strengthen the interfacial bonding strength of montmorillonite-nanopowder-polyester fiber, reduce powder shedding during subsequent spinning and washing processes, and its layered structure can synergistically improve the blocking effect of electromagnetic waves, and achieve simultaneous optimization of radiation protection performance, dispersion stability and mechanical properties in conjunction with other components.

[0013] Preferably, in step (2), 2-5 parts by weight of montmorillonite are dispersed in 20-80 parts by weight of deionized water, 0.3-0.5 parts by weight of polyethylene glycol are added, and ultrasonic dispersion is performed to form a suspension. Then, 3-6 parts by weight of nano-tin antimony oxide, 1-3 parts by weight of nano-zinc oxide and 0.5-1 parts by weight of nano-graphene sheets are added in sequence, and ultrasonic dispersion is continued to obtain mixture A. 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene are added to 10-30 parts by weight of anhydrous ethanol, and ultrasonic dispersion is performed to obtain mixture B.

[0014] By adopting the above technical solutions, the nano-graphene sheets possess a unique two-dimensional sheet structure, high specific surface area, and excellent electromagnetic wave absorption performance. When synergistically combined with nano-antimony tin oxide (ATO) and zinc oxide, they can construct an integrated radiation protection system of absorption-scattering-blocking, significantly broadening the radiation protection frequency band and improving the absorption efficiency of electromagnetic waves, thus solving the problems of narrow radiation protection frequency band and limited absorption capacity of single powders. At the same time, the layered structure of the nano-graphene sheets can form a spatial barrier network in the mixed liquid, hindering the agglomeration of ATO, zinc oxide, and montmorillonite particles, further improving the dispersion uniformity of inorganic powders in the system. In addition, the surface of the nano-graphene sheets is rich in functional groups such as hydroxyl and epoxy groups, which can interact with the PDA coating and silane coupling agent on the surface of dopamine-modified fibers, strengthening the interfacial bonding between powder and fiber, reducing powder shedding during subsequent spinning and washing processes. Meanwhile, its excellent mechanical properties can synergistically improve the breaking strength and toughness of the radiation protection fibers, achieving simultaneous optimization of functionality and mechanical properties.

[0015] Preferably, in step (2), 2-5 parts by weight of montmorillonite are dispersed in 20-80 parts by weight of deionized water, 0.3-0.5 parts by weight of polyethylene glycol are added, and ultrasonic dispersion is performed to form a suspension. Then, 3-6 parts by weight of nano-tin antimony oxide and 1-3 parts by weight of nano-cerium doped zinc oxide are added sequentially, and ultrasonic dispersion is continued to obtain mixture A. 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene are added to 10-30 parts by weight of anhydrous ethanol, and ultrasonic dispersion is performed to obtain mixture B.

[0016] By adopting the above technical solution and leveraging Ce 3+ By doping and regulating the crystal structure and electronic energy levels of zinc oxide, compared with pure nano zinc oxide, it can significantly broaden the electromagnetic wave absorption frequency band and improve the absorption efficiency of broadband electromagnetic waves. At the same time, it enhances the weather resistance and chemical stability of the powder. In synergy with ATO, nano graphene sheets and organically modified montmorillonite, it can construct a more efficient radiation protection system, further improving the functionality and long-term stability of radiation protection fibers.

[0017] Preferably, the nano-cerium-doped zinc oxide is prepared by a hydrothermal method, and the cerium doping amount is 5wt%-8wt%.

[0018] Preferably, in step (2), the silane coupling agent is a mixture of γ-aminopropyltriethoxysilane and 3-glycidyl etheroxypropyltrimethoxysilane in a mass ratio of (1-3):1.

[0019] By adopting the above technical solution, the amino groups in the aminopropyltriethoxysilane (KH550) molecule form strong chemical bonds with the hydroxyl groups on the surface of the inorganic powder, and can also interact with the amino and hydroxyl groups in the dopamine coating to enhance the bonding between the powder and the fiber surface; the epoxy groups in the 3-glycidyl etheroxypropyltrimethoxysilane molecule can undergo ring-opening reactions with the active groups in the polyester matrix and PDA coating to improve the compatibility of the inorganic powder-fiber composite system with the organic matrix. KH550 ensures strong bonding between inorganic powder and fiber, while KH560 optimizes the compatibility of the organic phase. The synergy of the two can solve the problems of insufficient compatibility between KH550 and the organic phase and weak bonding between KH560 and inorganic powder. It can also further strengthen the interfacial bonding network of inorganic powder-silane coupling agent-PDA-polyester fiber, reduce the risk of powder agglomeration and shedding, and improve the blending uniformity of composite modifier and polyester chips, ensuring the long-term stability of the mechanical properties and radiation protection function of radiation-proof fiber.

[0020] Preferably, the raw materials also include 0.1-0.3 parts by weight of antioxidant 1010.

[0021] By adopting the above technical solution, adding antioxidant 1010 to the fiber formulation of radiation-proof fabric can effectively inhibit the thermal oxidative degradation of polyester chips during high-temperature spinning, avoiding the decline in fiber mechanical properties caused by polymer molecular chain breakage. At the same time, it can slow down the catalytic aging effect of inorganic powders such as nano-tin antimony oxide and nano-cerium doped zinc oxide on the polyester matrix, preventing the fiber from yellowing and becoming brittle during long-term use or washing. This ensures the long-term stability of the mechanical properties such as breaking strength and breaking elongation of the radiation-proof fiber, as well as its wide-band radiation protection function, extending the service life of the fiber and fabric, without affecting the synergistic effect and dispersion uniformity of each radiation-proof component.

[0022] Secondly, this application provides a method for preparing fibers for radiation-proof fabrics, employing the following technical solution: A method for preparing fibers for radiation-proof fabrics includes the following steps: According to the formula, the raw materials are blended and extruded, and then spun, wound, and stretched to form fibers for radiation protection fabrics.

[0023] By adopting the above technical solution, it is possible to efficiently prepare radiation-resistant fabric fibers with a wide radiation protection frequency band, high radiation protection efficiency, strong powder loading fastness, stable mechanical properties, and washability. The process is highly controllable and suitable for industrial mass production.

[0024] In summary, this application has the following beneficial effects: 1. This application uses a method of chemical bonding with silane coupling agent and physical coating with polytetrafluoroethylene to load various inorganic radiation-shielding powders onto the surface of polyester staple fibers, thereby achieving uniform and stable dispersion of the powders, improving the washability and performance durability of the fabric, reducing the negative impact of the powders on the mechanical properties of the fibers, and finally preparing a functional fiber with excellent radiation protection performance, good mechanical properties and excellent washability.

[0025] 2. This application improves the interfacial bonding strength between powder and fiber, enhances powder dispersibility, reduces shedding, ensures long-term stable performance, and reduces the negative impact on fiber mechanical properties by modifying activated polyester fibers with dopamine.

[0026] 3. This application introduces nano-graphene sheets into the composite radiation-shielding modifier, which can construct an integrated radiation-shielding system, improve powder dispersibility, strengthen interfacial bonding and enhance fiber mechanical properties, thereby optimizing both function and mechanical properties.

[0027] 4. This application introduces nano-cerium-doped zinc oxide into the composite radiation-shielding modifier, which can broaden the absorption frequency band, improve efficiency and stability, and synergistically construct a highly efficient radiation-shielding system with other components, thereby improving fiber functionality and long-term stability. Detailed Implementation

[0028] The present application will be further described in detail below with reference to preparation examples, embodiments and comparative examples.

[0029] Unless otherwise specified, the raw materials used in the preparation examples, embodiments, and comparative examples of this application are all commercially available.

[0030] Preparation Example 1 This preparation example discloses a method for preparing a composite radiation-shielding modifier, specifically including the following steps: (1) Place 100 kg of polyester staple fiber (3-5 mm in length and 1.56 dtex in a plasma treatment instrument and perform vacuum treatment until the vacuum degree in the reaction chamber reaches -0.095 MPa. Maintain this vacuum degree for 30 min. Then, introduce 20 sccm of oxygen to maintain the vacuum degree in the reaction chamber at -0.085 MPa for 15 min. Set the plasma treatment power to 120 W and treat for 8 min. After the treatment is completed, continue to introduce gas for 5 min. After the temperature in the reaction chamber drops to room temperature, close the gas valve, take out the fiber, and obtain activated polyester fiber. (2) Add 3 kg of montmorillonite (particle size 50-100 nm) to 50 kg of deionized water, place it in an ultrasonic disperser, and ultrasonically disperse for 20 min at a power of 400 W and a frequency of 40 kHz to form a suspension; then add 4.5 kg of nano-tin antimony oxide (particle size 20 nm, antimony doping amount 10 wt%) and 2 kg of nano-zinc oxide (particle size 10-30 nm) in sequence, and continue ultrasonic dispersion for 30 min to obtain mixture A; add 0.6 kg of γ-aminopropyltriethoxysilane (KH550) and 0.3 kg of polytetrafluoroethylene (particle size 500-800 nm) to 20 kg of anhydrous ethanol, and ultrasonically disperse for 15 min in an ultrasonic disperser to obtain mixture B; (3) The activated polyester fiber was placed in the mixture A and transferred to a constant temperature water bath stirrer. It was stirred for 35 minutes at 50°C and 400 rpm. Then, the mixture B was added to the system dropwise at a rate of 1.5 drops / s through a constant pressure dropping funnel. After the addition was completed, the temperature was maintained at 50°C and the mixture was subjected to constant temperature ultrasonic reaction at 500W power and 40kHz frequency in an ultrasonic disperser for 75 minutes. After the reaction was completed, the product was placed in a vacuum drying oven and dried for 6 hours at 90°C and -0.09MPa vacuum. The dried product was placed in a high-speed pulverizer and pulverized for 5 minutes at a speed of 12000 rpm. Then, it was sieved through a 200-mesh standard sieve, and the sieve-underfilled material was collected as the composite radiation-proof modifier.

[0031] Preparation Example 2 This preparation example is basically the same as Preparation Example 1, except that (1) 100 kg of polyester staple fiber (length 3-5 mm, linear density 1.56 dtex) was placed in a plasma treatment instrument and vacuumed until the vacuum degree in the reaction chamber reached -0.095 MPa and maintained at this vacuum degree for 30 min; then, a mixed gas formed by 18 sccm of oxygen and 2 sccm of argon was introduced to maintain the vacuum degree in the reaction chamber at -0.085 MPa and ventilated for 15 min; the plasma treatment power was set to 120 W and the treatment was carried out for 8 min. After the treatment was completed, the mixed gas was continued to be introduced for 5 min. After the temperature of the reaction chamber dropped to room temperature, the gas valve was closed, the fiber was taken out, and ultrasonically cleaned with 3 L of anhydrous ethanol at 400 W power and 40 kHz frequency for 5 min at room temperature. Then, it was centrifuged at 300 rpm for 5 min and dried at 60 °C to constant weight to obtain activated polyester fiber.

[0032] Preparation Example 3 This preparation example is basically the same as preparation example 2, except that step (1) also includes modification treatment, specifically: the activated polyester fiber is placed in 55 kg of deionized water, 0.45 kg of dopamine is added in sequence, and glacial acetic acid is added to adjust the pH of the system to 8.5. The mixture is stirred and reacted for 1 h. After the reaction is completed, the mixture is centrifuged at 300 rpm for 5 min, and then ultrasonically cleaned with 3 L of deionized water at 400 W power and 40 kHz frequency at room temperature for 5 min. Finally, the mixture is dried at 60 °C to constant weight to obtain dopamine modified activated polyester fiber.

[0033] Preparation Example 4 This preparation example is basically the same as Preparation Example 1, except that (2) 3 kg of modified montmorillonite was added to 50 kg of deionized water and placed in an ultrasonic disperser. Under the conditions of power 400 W and frequency 40 kHz, it was ultrasonically dispersed for 20 min to form a suspension. Then, 4.5 kg of nano-tin antimony oxide (particle size 20 nm, antimony doping amount 10 wt%) and 2 kg of nano-zinc oxide (particle size 10-30 nm) were added in sequence and ultrasonically dispersed for another 30 min to obtain mixture A. 0.6 kg of γ-aminopropyltriethoxysilane (KH550) and 0.3 kg of polytetrafluoroethylene were added to 20 kg of anhydrous ethanol and ultrasonically dispersed in an ultrasonic disperser for 15 min to obtain mixture B. The preparation method of modified montmorillonite is as follows: 3 kg of montmorillonite was added to 50 kg of deionized water and placed in an ultrasonic disperser. Add 50 kg of deionized water (particle size 50-100 nm) to an ultrasonic disperser and disperse for 20 min at 400 W power and 40 kHz frequency to form a suspension. Add 0.45 kg of hexadecyltrimethylammonium bromide to the suspension and stir for 2 h at 80 °C and 550 rpm. After the reaction, cool to room temperature and filter under reduced pressure. Wash the filter cake with deionized water several times until no bromide ions are detected in the washing liquid (using 0.1 mol / L AgNO3 solution). Finally, wash once with anhydrous ethanol. Dry the washed filter cake at 90 °C and -0.08 MPa vacuum for 5 h. After pulverizing at 10,000 rpm for 3 min, sieve through a 200 mesh standard sieve to obtain modified montmorillonite.

[0034] Preparation Example 5 This preparation example is basically the same as Preparation Example 1, except that (2) 3 kg of montmorillonite (particle size 50-100 nm) was added to 50 kg of deionized water and placed in an ultrasonic disperser. Under the conditions of power 400 W and frequency 40 kHz, it was ultrasonically dispersed for 20 min to form a suspension. Then, 4.5 kg of nano-tin antimony oxide (particle size 20 nm, antimony doping amount 10 wt%), 2 kg of nano-zinc oxide (particle size 10-30 nm) and 0.85 kg of nano-graphene sheets (thickness 4-20 nm, micro-sheet size 5-10 μm, number of layers <20) were added in sequence and ultrasonically dispersed for 30 min to obtain mixture A. 0.6 kg of γ-aminopropyltriethoxysilane (KH550) and 0.3 kg of polytetrafluoroethylene (particle size 500-800 nm) were added to 20 kg of anhydrous ethanol and ultrasonically dispersed in an ultrasonic disperser for 15 min to obtain mixture B.

[0035] Preparation Example 6 This preparation example is basically the same as Preparation Example 1, except that (2) 3 kg of montmorillonite (particle size 50-100 nm) was added to 50 kg of deionized water and placed in an ultrasonic disperser. Under the conditions of power 400 W and frequency 40 kHz, it was ultrasonically dispersed for 20 min to form a suspension. Then, 4.5 kg of nano-tin antimony oxide (particle size 20 nm, antimony doping amount 10 wt%) and 2 kg of nano-cerium doped zinc oxide were added in sequence, and ultrasonic dispersion was continued for 30 min to obtain mixture A. 0.6 kg of γ-aminopropyltriethoxysilane (KH550) and 0.3 kg of polytetrafluoroethylene (particle size 500-800 nm) were added to 20 kg of anhydrous ethanol and ultrasonically dispersed in an ultrasonic disperser for 15 min to obtain mixture B. The preparation method of nano-cerium doped zinc oxide is as follows: The following steps were performed: 1.39 kg of zinc nitrate and 0.13 kg of cerium nitrate were dissolved in 40 L of deionized water and stirred for 30 min to obtain a mixed salt solution; then 1.5 kg of urea was added, and stirring was continued for 30 min. The solution was then transferred to a 50 L volumetric flask and diluted to volume to obtain a precursor solution; the precursor solution was transferred to a polytetrafluoroethylene-lined high-pressure reactor and reacted at 180 °C for 12 h. After naturally cooling to room temperature, the precipitate was separated by centrifugation at 8000 rpm for 10 min. The precipitate was washed three times with deionized water and once with anhydrous ethanol; the washed precipitate was dried at 60 °C for 12 h, and then placed in a muffle furnace and heated to 500 °C at a heating rate of 5 °C / min. The calcination was maintained at this temperature for 2 h, cooled with the furnace, and then ground to obtain nano-zinc oxide powder with a cerium doping content of 6 wt%.

[0036] Preparation Example 7 This preparation example is basically the same as Preparation Example 1, except that (2) 3 kg of montmorillonite (particle size 50-100 nm) was added to 50 kg of deionized water and placed in an ultrasonic disperser. Under the conditions of power 400 W and frequency 40 kHz, the mixture was ultrasonically dispersed for 20 min to form a suspension. Then, 4.5 kg of nano-tin antimony oxide (particle size 20 nm, antimony doping amount 10 wt%) and 2 kg of nano-zinc oxide (particle size 10-30 nm) were added in sequence and ultrasonically dispersed for 30 min to obtain mixture A. 0.4 kg of γ-aminopropyltriethoxysilane (KH550), 0.2 kg of 3-glycidyl etheroxypropyltrimethoxysilane and 0.3 kg of polytetrafluoroethylene (particle size 500-800 nm) were added to 20 kg of anhydrous ethanol and ultrasonically dispersed in an ultrasonic disperser for 15 min to obtain mixture B.

[0037] Preparation Example 8 This preparation example discloses a method for preparing a composite radiation-shielding modifier, specifically including the following steps: (1) Place 100 kg of polyester staple fiber (3-5 mm in length, 1.56 dtex linear density) into a plasma treatment instrument and perform vacuum treatment until the vacuum degree in the reaction chamber reaches -0.095 MPa, and maintain this vacuum degree for 30 min; then, introduce a mixed gas formed by 16 sccm of oxygen and 2 sccm of argon to maintain the vacuum degree in the reaction chamber at -0.085 MPa for 15 min; set the plasma treatment power to 100 W and treat for 10 min. After the treatment is completed, continue to introduce the mixed gas for 5 min. After the temperature of the reaction chamber drops to room temperature, close the gas valve, take out the fiber, and use 3 L of anhydrous ethanol was ultrasonically cleaned at room temperature for 5 min at 400 W power and 40 kHz frequency, followed by centrifugation at 300 rpm for 5 min and drying at 60 ℃ to constant weight to obtain activated polyester fibers. The activated polyester fibers were placed in 50 kg of deionized water, and 0.3 kg of dopamine was added sequentially. Glacial acetic acid was added to adjust the pH of the system to 8.5, and the reaction was stirred for 0.5 h. After the reaction was completed, the fibers were centrifuged at 300 rpm for 5 min, and then ultrasonically cleaned with 3 L of deionized water at room temperature for 5 min at 400 W power and 40 kHz frequency. Finally, the fibers were dried at 60 ℃ to constant weight to obtain dopamine-modified activated polyester fibers.

[0038] (2) Add 2 kg of modified montmorillonite to 20 kg of deionized water and place it in an ultrasonic disperser. Under the conditions of power 400 W and frequency 40 kHz, ultrasonically disperse for 20 min to form a suspension. Then add 6 kg of nano antimony tin oxide (particle size 20 nm, antimony doping amount 10 wt%), 3 kg of nano cerium doped zinc oxide and 0.5 kg of nano graphene sheets (thickness 4-20 nm, micro-sheet size 5-10 μm, number of layers <20), and continue ultrasonic dispersion for 30 min to obtain mixture A. Add 0.1 kg of γ-aminopropyltriethoxysilane (KH550), 0.1 kg of 3-glycidyl etheroxypropyltrimethoxysilane and 0.5 kg of polytetrafluoroethylene to 20 kg of anhydrous ethanol and place it in an ultrasonic disperser for ultrasonic dispersion for 15 min to obtain mixture B. The modified montmorillonite was prepared as follows: 3 kg of montmorillonite (particle size 50-100 nm) was added to 50 kg of deionized water and placed in an ultrasonic disperser. The mixture was ultrasonically dispersed for 20 min at a power of 400 W and a frequency of 40 kHz to form a suspension. 0.45 kg of hexadecyltrimethylammonium bromide was added to the suspension and stirred at 75 °C and 550 rpm for 2.5 h. After the reaction, the mixture was cooled to room temperature and filtered under reduced pressure. The filter cake was washed repeatedly with deionized water until no bromide ions were detected in the washing liquid (using 0.1 mol / L AgNO3 solution). Finally, it was washed once with anhydrous ethanol. The washed filter cake was dried at 90 °C and a vacuum of -0.08 MPa for 5 h, then pulverized at 10,000 rpm for 3 min using a pulverizer. Finally, it was sieved through a 200-mesh standard sieve to obtain the modified montmorillonite. The preparation method of cerium-doped zinc oxide nanoparticles is as follows: 1.41 kg of zinc nitrate and 0.11 kg of cerium nitrate are dissolved in 40 L of deionized water and stirred for 30 min to obtain a mixed salt solution; then 1.5 kg of urea is added and stirred for another 30 min, transferred to a 50 L volumetric flask and diluted to volume to obtain a precursor solution; the precursor solution is transferred to a polytetrafluoroethylene-lined high-pressure reactor and reacted at 180 °C for 12 h. After naturally cooling to room temperature, the precipitate is separated by centrifugation at 8000 rpm for 10 min, and washed three times with deionized water and once with anhydrous ethanol; the washed precipitate is dried at 60 °C for 12 h, and then placed in a muffle furnace and heated to 500 °C at a heating rate of 5 °C / min, calcined for 2 h, cooled with the furnace and ground to finally obtain cerium-doped zinc oxide nanoparticles with a doping content of 5 wt%.

[0039] (3) The activated polyester fiber was placed in the mixture A and transferred to a constant temperature water bath stirrer. It was stirred for 40 min at 40℃ and 400 rpm. Then, the mixture B was added to the system dropwise at a rate of 1.5 drops / s through a constant pressure dropping funnel. After the addition was completed, the temperature was maintained at 40℃ and the mixture was subjected to constant temperature ultrasonic reaction at 500W power and 40kHz frequency in an ultrasonic disperser for 90 min. After the reaction was completed, the product was placed in a vacuum drying oven and dried for 6 h at 90℃ and a vacuum degree of -0.09MPa. The dried product was placed in a high-speed pulverizer and pulverized for 5 min at a speed of 12000 rpm. Then, it was sieved through a 200-mesh standard sieve and the sieve material was collected as the composite radiation-proof modifier.

[0040] Preparation Example 9 This preparation example discloses a method for preparing a composite radiation-shielding modifier, specifically including the following steps: (1) Place 100 kg of polyester staple fiber (3-5 mm in length, 1.56 dtex linear density) into a plasma treatment instrument and perform vacuum treatment until the vacuum degree in the reaction chamber reaches -0.095 MPa, and maintain this vacuum degree for 30 min; then, introduce a mixed gas formed by 20 sccm of oxygen and 2 sccm of argon to maintain the vacuum degree in the reaction chamber at -0.085 MPa for 15 min; set the plasma treatment power to 150 W and treat for 5 min. After the treatment is completed, continue to introduce the mixed gas for 5 min. After the temperature of the reaction chamber drops to room temperature, close the gas valve, take out the fiber, and use... 3L of anhydrous ethanol was ultrasonically cleaned at room temperature for 5 min at 400W power and 40kHz frequency, then centrifuged at 300rpm for 5 min, and dried at 60℃ to constant weight to obtain activated polyester fibers. The activated polyester fibers were placed in 60kg of deionized water, and 0.6kg of dopamine was added sequentially. Glacial acetic acid was added to adjust the pH of the system to 9, and the reaction was stirred for 1.5h. After the reaction was completed, the fibers were centrifuged at 300rpm for 5 min, ultrasonically cleaned at room temperature for 5 min at 400W power and 40kHz frequency with 3L of deionized water, and then dried at 60℃ to constant weight to obtain dopamine-modified activated polyester fibers.

[0041] (2) Add 5 kg of modified montmorillonite to 80 kg of deionized water and place it in an ultrasonic disperser. Under the conditions of power 400 W and frequency 40 kHz, ultrasonically disperse for 20 min to form a suspension. Then add 3 kg of nano antimony tin oxide (particle size 20 nm, antimony doping amount 10 wt%), 1 kg of nano cerium doped zinc oxide and 1.2 kg of nano graphene sheets (thickness 4-20 nm, micro-sheet size 5-10 μm, number of layers <20), and continue ultrasonic dispersion for 30 min to obtain mixture A. Add 0.75 kg of γ-aminopropyltriethoxysilane (KH550), 0.25 kg of 3-glycidyl etheroxypropyltrimethoxysilane and 0.1 kg of polytetrafluoroethylene to 20 kg of anhydrous ethanol and place it in an ultrasonic disperser for ultrasonic dispersion for 15 min to obtain mixture B. The modified montmorillonite was prepared as follows: 3 kg of montmorillonite (particle size 50-100 nm) was added to 50 kg of deionized water and placed in an ultrasonic disperser. The mixture was ultrasonically dispersed for 20 min at a power of 400 W and a frequency of 40 kHz to form a suspension. 0.45 kg of hexadecyltrimethylammonium bromide was added to the suspension and stirred at 85 °C and 550 rpm for 1.5 h. After the reaction, the mixture was cooled to room temperature and filtered under reduced pressure. The filter cake was washed multiple times with deionized water until no bromide ions were detected in the washing liquid (using 0.1 mol / L AgNO3 solution). Finally, the filter cake was washed once with anhydrous ethanol. The washed filter cake was dried at 90 °C and a vacuum of -0.08 MPa for 5 h. After being pulverized at 10,000 rpm for 3 min, the modified montmorillonite was obtained by sieving through a 200-mesh standard sieve. The preparation method of nano-cerium-doped zinc oxide is as follows: 1.37 kg of zinc nitrate and 0.17 kg of cerium nitrate are dissolved in 40 L of deionized water and stirred for 30 min to obtain a mixed salt solution; then 1.5 kg of urea is added and stirred for another 30 min, transferred to a 50 L volumetric flask and diluted to volume to obtain a precursor solution; the precursor solution is transferred to a high-pressure reactor lined with polytetrafluoroethylene and reacted at 180 °C for 12 h. After naturally cooling to room temperature, the precipitate is separated by centrifugation at 8000 rpm for 10 min, and washed three times with deionized water and once with anhydrous ethanol; the washed precipitate is dried at 60 °C for 12 h, and then placed in a muffle furnace and heated to 500 °C at a heating rate of 5 °C / min, and calcined for 2 h. After cooling with the furnace, it is ground to finally obtain nano-zinc oxide powder with a cerium doping content of 8 wt%.

[0042] (3) The activated polyester fiber was placed in the mixture A and transferred to a constant temperature water bath stirrer. It was stirred for 30 min at 60℃ and 400 rpm. Then, the mixture B was added to the system dropwise at a rate of 1.5 drops / s through a constant pressure dropping funnel. After the addition was completed, the temperature was maintained at 60℃ and the mixture was subjected to constant temperature ultrasonic reaction at 500W power and 40kHz frequency in an ultrasonic disperser for 60 min. After the reaction was completed, the product was placed in a vacuum drying oven and dried for 6 h at 90℃ and -0.09MPa vacuum. The dried product was placed in a high-speed pulverizer and pulverized for 5 min at a speed of 12000 rpm. Then, it was sieved through a 200-mesh standard sieve and the sieve material was collected as the composite radiation-proof modifier.

[0043] Example 1 This embodiment provides a method for preparing fibers for radiation-proof fabrics, including the following steps: 86 kg of polyester chips and 14 kg of composite radiation-shielding modifier were added to a screw extruder, and the temperatures of each section were controlled as follows: Zone 1 250-255℃, Zone 2 265-270℃, Zone 3 270-275℃, and Die Head 268-272℃, with a screw speed of 35 r / min. After the melt was extruded through a spinneret (spinneret orifice diameter 0.2 mm), it was cooled and shaped at 25℃ and 65% relative humidity, wound at a speed of 1000 m / min, and then stretched at 85℃ (stretch ratio 2.5 times), and set at 120℃ for 30 min to obtain the fiber for radiation-shielding fabric. The composite radiation-shielding modifier was obtained from Preparation Example 1.

[0044] Example 2 This embodiment is basically the same as Example 1, except that the composite radiation-shielding modifier is the one obtained in Preparation Example 2.

[0045] Example 3 This embodiment is basically the same as Example 1, except that the composite radiation-shielding modifier is the one obtained in Preparation Example 3.

[0046] Example 4 This embodiment is basically the same as Example 1, except that the composite radiation-shielding modifier is the one obtained in Preparation Example 4.

[0047] Example 5 This embodiment is basically the same as Example 1, except that the composite radiation-shielding modifier is the one obtained in Preparation Example 5.

[0048] Example 6 This embodiment is basically the same as Example 1, except that the composite radiation-shielding modifier is the one obtained in Preparation Example 6.

[0049] Example 7 This embodiment is basically the same as Example 1, except that the composite radiation-shielding modifier is the one obtained in Preparation Example 7.

[0050] Example 8 This embodiment provides a method for preparing fibers for radiation-proof fabrics, including the following steps: 86 kg of polyester chips, 14 kg of composite radiation-resistant modifier, and 0.2 kg of antioxidant 1010 were added to a screw extruder. The temperatures of each section were controlled as follows: Zone 1 250-255℃, Zone 2 265-270℃, Zone 3 270-275℃, and Die Head 268-272℃. The screw speed was 35 r / min. After the melt was extruded through a spinneret (spinneret orifice diameter 0.2 mm), it was cooled and shaped at 25℃ and 65% relative humidity. It was then wound at a speed of 1000 m / min, stretched at 85℃ (stretch ratio 2.5 times), and set at 120℃ for 30 min to obtain the fiber for radiation-resistant fabric. The composite radiation-resistant modifier was obtained from Preparation Example 1.

[0051] Example 9 This embodiment provides a method for preparing fibers for radiation-proof fabrics, including the following steps: 82 kg of polyester chips, 18 kg of composite radiation-resistant modifier, and 0.1 kg of antioxidant 1010 were added to a screw extruder. The temperatures of each section were controlled as follows: Zone 1 250-255℃, Zone 2 265-270℃, Zone 3 270-275℃, and Die Head 268-272℃. The screw speed was 35 r / min. After the melt was extruded through a spinneret (spinneret orifice diameter 0.2 mm), it was cooled and shaped at 25℃ and 65% relative humidity. It was then wound at a speed of 1000 m / min, stretched at 85℃ (stretch ratio 2.5 times), and set at 120℃ for 30 min to obtain the fiber for radiation-resistant fabric. The composite radiation-resistant modifier was obtained from Preparation Example 8.

[0052] Example 10 This embodiment provides a method for preparing fibers for radiation-proof fabrics, including the following steps: 90 kg of polyester chips, 10 kg of composite radiation-resistant modifier, and 0.3 kg of antioxidant 1010 were added to a screw extruder. The temperatures of each section were controlled as follows: Zone 1 250-255℃, Zone 2 265-270℃, Zone 3 270-275℃, and Die Head 268-272℃. The screw speed was 35 r / min. After the melt was extruded through a spinneret (spinneret orifice diameter 0.2 mm), it was cooled and shaped at 25℃ and 65% relative humidity. It was then wound at a speed of 1000 m / min, stretched at 85℃ (stretch ratio 2.5 times), and set at 120℃ for 30 min to obtain the fiber for radiation-resistant fabric. The composite radiation-resistant modifier was obtained from Preparation Example 9.

[0053] Comparative Example 1 This comparative example provides a method for preparing fibers for radiation-proof fabrics, comprising the following steps: (1) Place 100 kg of polyester staple fiber (3-5 mm in length, 1.56 dtex in linear density) in a vacuum drying oven and dry it at 120 °C and -0.09 MPa for 8 h; place 3 kg of montmorillonite (50-100 nm in particle size) in a forced-air drying oven and dry it at 105 °C for 2 h; mix the dried polyester staple fiber and montmorillonite with 4.5 kg of nano-tin antimony oxide (20 nm in particle size, 10 wt% antimony doping) and 2 kg of nano-zinc oxide (10-30 nm in particle size) at 1000 rpm for 20 min to obtain a mixture; then dilute 0.6 kg of γ-aminopropyltriethoxysilane with 5 kg of anhydrous ethanol to obtain a diluted solution, and pass it through a constant pressure dropping funnel at a speed of 2 m The mixture is dripped into the compound at a rate of L / min while stirring (maintaining 1000 rpm). After the dripping is completed, stirring is continued for 30 minutes to obtain the compound. The compound is then fed into a twin-screw extruder for melt blending and extrusion. The temperatures of each section of the extruder are controlled as follows: Zone 1 240-245℃, Zone 2 255-260℃, Zone 3 260-285℃, and Die Head 258-262℃. The screw speed is 40 r / min. After the melt is filtered through a 200-mesh filter, it is extruded through a circular die. The extruded melt strip is immediately sent to a 25℃ cold water bath for cooling and shaping. Then, it is cut into granules with a diameter of 2 mm and a length of 2 mm by a pelletizer. The granules are then placed in an 80℃ forced-air drying oven for 4 hours to obtain the composite radiation-shielding modifier. (2) Add 86kg of polyester chips and 14kg of composite radiation-proof modifier into the screw extruder and control the temperature of each section: Zone 1 250-255℃, Zone 2 265-270℃, Zone 3 270-275℃, and the die head 268-272℃. The screw speed is 35r / min. After the melt is extruded through the spinneret (spinneret hole diameter 0.2mm), it is cooled and shaped at 25℃ and 65% relative humidity. It is wound at a speed of 1000m / min and then stretched at 85℃ (stretch ratio 2.5 times). It is then shaped at 120℃ for 30min to obtain the fiber for radiation-proof fabric.

[0054] Performance testing The radiation-proof fabric fibers obtained in Examples 1-10 and Comparative Example 1 were mixed with combed cotton fibers (38 mm in length, 1.56 dtex linear density) at a mass ratio of 2:8 in an opening machine for initial opening and mixing. The mixture was then further homogenized using a multi-bin blending machine. The mixed fibers were fed into a carding machine with a cylinder speed of 320 r / min and a flats speed of 150 mm / min to form a uniform cotton web, which was then used to make a sliver. The sliver was then passed through three drawing frames, with the total draft ratio controlled at 8.5. The drawn sliver was then fed into a roving frame with a twist coefficient of 95 and a spindle speed of 800 r / min. n, is spun into roving; the roving is then fed into a spinning frame, with a twist coefficient of 390 and a spindle speed of 15000 r / min, to produce a 14.5 tex (40 count) blended yarn; this blended yarn is used as the weft yarn, and pure cotton yarn of the same specification is selected as the warp yarn. The yarn is woven on a rapier loom using a plain weave structure, with a warp density of 300 ends / 10cm, a weft density of 280 ends / 10cm, a width of 150cm, and a weaving speed of 300 r / cm, to produce a blended fabric; after the fabric is equilibrated for 24 hours under standard atmospheric conditions of 20℃ and 65% relative humidity, various performance tests are conducted, and the test results are recorded in Table 1.

[0055] Electromagnetic shielding effectiveness: Tested in accordance with GB / T30142-2013 "Test of electromagnetic radiation protection performance of textiles", with a test frequency band of 30MHz-3GHz.

[0056] Mechanical properties: The tensile strength and elongation at break of the fabric were tested in accordance with GB / T3923.1-2013 "Textiles - Tensile properties of fabrics - Part 1: Determination of breaking strength and elongation at break (strip method)".

[0057] Washability: The electromagnetic shielding effectiveness was measured again after 50 washing cycles according to GB / T8629-2017 "Test Procedures for Household Washing and Drying of Textiles" and the retention rate was calculated.

[0058] Table 1. Performance test data of fibers used in radiation-proof fabrics in Examples 1-10 and Comparative Example 1.

[0059] Referring to Table 1, and combining Example 1 and Comparative Example 1, it can be seen that Example 1 is superior to Comparative Example 1 in overall performance. Regarding radiation protection, Example 1 shows a significant improvement in shielding effectiveness. This is attributed to the synergistic effect of the composite radiation-protective modifier used, which, through chemical bonding with silane coupling agents and physical coating with polytetrafluoroethylene, effectively improves the dispersibility and interfacial compatibility of inorganic powder in the polyester matrix, forming a more continuous and efficient electromagnetic wave absorption and shielding network. In terms of mechanical properties, the breaking strength and elongation at break of Example 1 are significantly improved. This is because the plasma activation treatment of polyester staple fibers increases the active sites on the fiber surface, promotes a strong bond between the powder and the fiber, and reduces stress concentration points caused by powder agglomeration, thereby effectively mitigating the negative impact of high powder content on the fiber's mechanical properties. In terms of performance, the washability of Example 1 is significantly improved. This is attributed to the effective protection of the hydrophobic protective layer of polytetrafluoroethylene from the erosion of the powder-fiber interface by water, while the chemical bonding of the silane coupling agent enhances the adhesion of the powder and significantly reduces the powder shedding rate during washing.

[0060] Referring to Table 1 and combining Examples 1 and 3, it can be seen that Example 3 exhibits superior performance compared to Example 1 in all aspects. This improvement is mainly due to the innovative introduction of a dopamine modification step after the plasma activation treatment of polyester staple fibers in Example 3. This step constructs a polydopamine (PDA) bonding layer on the fiber surface. The abundant amino and hydroxyl groups on its molecular chain can not only form strong chemical bonds with the active groups on the fiber surface, but also provide a large number of additional adsorption sites for subsequent inorganic powder loading. Thus, through the dual synergy of physical adsorption and chemical action, the interfacial bonding strength between the inorganic powder and the fiber matrix is ​​significantly enhanced. This enhanced interfacial bonding effectively inhibits the agglomeration tendency of the powder during mixing, spinning, and subsequent processing, making the powder dispersion within the fiber more uniform and forming a more continuous and efficient electromagnetic wave absorption and shielding network, thereby improving shielding effectiveness. On the other hand, it also greatly enhances the adhesion of the powder to the fiber, significantly reducing the risk of powder detachment during washing and other uses, thus greatly improving washability. At the same time, the improved uniformity of powder dispersion also reduces stress concentration caused by agglomeration, which plays a positive role in optimizing the mechanical properties of fibers, such as breaking strength and elongation.

[0061] Referring to Table 1 and combining Examples 1 and 5, it can be seen that Example 5 is superior to Example 1 in terms of radiation protection performance, mechanical properties, and washability. This improvement is mainly due to the introduction of nano-graphene sheets into the composite radiation protection modifier in Example 5. Nano-graphene sheets possess a unique two-dimensional sheet structure, high specific surface area, and excellent electromagnetic wave absorption performance. When synergistically combined with nano-antimony tin oxide (ATO) and zinc oxide, they can construct an integrated radiation protection system that absorbs, scatters, and blocks radiation, significantly broadening the radiation protection frequency band and improving the absorption efficiency of electromagnetic waves. This solves the problems of narrow radiation protection frequency bands and limited absorption capacity of single powders. Simultaneously, the layered structure of nano-graphene sheets can form a spatial barrier network in the mixed liquid, hindering the agglomeration of ATO, zinc oxide, and montmorillonite particles, further improving the dispersion uniformity of inorganic powders in the system. In addition, the surface of nano-graphene sheets is rich in functional groups such as hydroxyl and epoxy groups, which can interact with the PDA coating and silane coupling agent on the surface of dopamine-modified fibers, strengthening the interfacial bonding between powder and fiber, reducing powder shedding during subsequent spinning and washing processes. At the same time, its excellent mechanical properties can synergistically improve the breaking strength and toughness of radiation-protective fibers, achieving simultaneous optimization of functionality and mechanical properties.

[0062] Referring to Table 1 and combining Examples 1 and 6, it can be seen that Example 6 is superior to Example 1 in terms of shielding effectiveness, mechanical properties, and washability. This improvement is mainly due to the use of nano-cerium-doped zinc oxide instead of pure nano-zinc oxide in Example 6. Cerium doping effectively modulates the crystal structure and electronic energy levels of zinc oxide, increasing internal defects and carrier concentration, thereby significantly enhancing its dielectric and magnetic loss resistance to electromagnetic waves, broadening the effective absorption frequency band, and improving absorption efficiency. Simultaneously, cerium doping also enhances the chemical stability and weather resistance of the zinc oxide powder, enabling it to construct a more efficient and stable integrated absorption-scattering-blocking radiation protection system when working synergistically with other components such as nano-tin antimony oxide and montmorillonite. Furthermore, the interfacial compatibility between the modified zinc oxide powder and the fiber matrix and other components is improved, helping to reduce agglomeration and improve the mechanical properties and washability of the fiber.

[0063] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A fiber for radiation-proof fabrics, characterized in that, The raw materials include the following parts by weight: 82-90 parts polyester chips and 10-18 parts composite radiation-shielding modifier; the preparation method of the composite radiation-shielding modifier includes the following steps: (1) 100 parts by weight of polyester staple fiber were plasma treated at 100-150W power for 5-10 minutes to obtain activated polyester fiber; (2) Disperse 2-5 parts by weight of montmorillonite in 20-80 parts by weight of deionized water by ultrasonic dispersion to form a suspension, then add 3-6 parts by weight of nano-tin antimony oxide and 1-3 parts by weight of nano-zinc oxide in sequence, and continue ultrasonic dispersion to obtain mixture A; add 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene to 10-30 parts by weight of anhydrous ethanol, and ultrasonically disperse to obtain mixture B; (3) Add activated polyester fibers to mixture A and stir at 40-60℃ for 30-40 min. Then add mixture B dropwise. After the addition is complete, perform a constant temperature ultrasonic reaction for 60-90 min. Dry, pulverize and sieve to obtain composite radiation-proof modifier.

2. The fiber for radiation-proof fabric according to claim 1, characterized in that, Step (1) Place 100 parts by weight of polyester staple fiber into a plasma treatment instrument and treat it for 5-10 minutes at 100-150W and 0.08-0.1MPa in a mixed gas atmosphere of oxygen and argon with a volume ratio of (8-10):

1. After treatment, ultrasonically clean and dry the fiber with anhydrous ethanol to obtain activated polyester fiber.

3. The fiber for radiation-proof fabric according to claim 1, characterized in that, Step (1) also includes modification treatment, specifically: the obtained activated polyester fiber is placed in 50-60 parts by weight of deionized water, 0.3-0.6 parts by weight of dopamine is added and the pH of the system is adjusted to 8.5-9.0, and the reaction is stirred for 0.5-1.5h; after the reaction is completed, the fiber is filtered, washed and dried to obtain dopamine modified activated polyester fiber.

4. The fiber for radiation-proof fabric according to claim 1, characterized in that, Step (2): Disperse 2-5 parts by weight of organic modified montmorillonite in 20-80 parts by weight of deionized water, add 0.3-0.5 parts by weight of polyethylene glycol, and ultrasonically disperse to form a suspension. Then add 3-6 parts by weight of nano-tin antimony oxide and 1-3 parts by weight of nano-zinc oxide, and continue ultrasonic dispersion to obtain mixture A; add 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene to 10-30 parts by weight of anhydrous ethanol, and ultrasonically disperse to obtain mixture B; The method for preparing the organically modified montmorillonite is as follows: montmorillonite and hexadecyltrimethylammonium bromide are stirred and reacted in deionized water at 75-85℃ for 1.5-2.5h, and then filtered and dried.

5. The fiber for radiation-proof fabric according to claim 1, characterized in that, Step (2): Disperse 2-5 parts by weight of montmorillonite in 20-80 parts by weight of deionized water, add 0.3-0.5 parts by weight of polyethylene glycol, and ultrasonically disperse to form a suspension. Then add 3-6 parts by weight of nano-tin antimony oxide, 1-3 parts by weight of nano-zinc oxide and 0.5-1 parts by weight of nano-graphene sheets in sequence, and continue ultrasonic dispersion to obtain mixture A. Add 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene to 10-30 parts by weight of anhydrous ethanol, and ultrasonically disperse to obtain mixture B.

6. The fiber for radiation-proof fabric according to claim 1, characterized in that, Step (2) Disperse 2-5 parts by weight of montmorillonite in 20-80 parts by weight of deionized water, add 0.3-0.5 parts by weight of polyethylene glycol, and ultrasonically disperse to form a suspension. Then add 3-6 parts by weight of nano-tin antimony oxide and 1-3 parts by weight of nano-cerium doped zinc oxide, and continue ultrasonic dispersion to obtain mixture A. Add 0.2-1 parts by weight of silane coupling agent and 0.1-0.5 parts by weight of polytetrafluoroethylene to 10-30 parts by weight of anhydrous ethanol, and ultrasonically disperse to obtain mixture B.

7. The fiber for radiation-proof fabric according to claim 6, characterized in that, The nano-cerium-doped zinc oxide was prepared by a hydrothermal method, and the cerium doping amount was 5wt%-8wt%.

8. The fiber for radiation-proof fabric according to claim 1, characterized in that, In step (2), the silane coupling agent is a mixture of γ-aminopropyltriethoxysilane and 3-glycidyl etheroxypropyltrimethoxysilane in a mass ratio of (1-3):

1.

9. The fiber for radiation-proof fabric according to claim 1, characterized in that, The raw materials also include 0.1-0.3 parts by weight of antioxidant 1010.

10. The method for preparing fibers for radiation-proof fabrics according to any one of claims 1-9, characterized in that, Includes the following steps: According to the formula, the raw materials are blended and extruded, and then spun, wound, and stretched to form fibers for radiation protection fabrics.

Images