Green bomb disposal suit protective material and preparation method thereof

Abstract

The application provides a green explosive-removing clothes protection material and a preparation method thereof, and relates to the technical field of explosive-removing clothes protection materials. A shear thickening liquid prepared from industrial solid waste is impregnated with a metal ion modified aramid fabric to prepare a composite fabric with the shear thickening liquid as a carrier; and the composite fabric is prepared by using the preparation method. Compared with the prior art, the application has the following beneficial effects: based on the important application background of shear thickening composite materials, the application first develops a preparation method of amino-modified solid waste-based shear thickening liquid, realizes solid waste resource utilization, and the dispersed phase particles can effectively adhere to the aramid surface in a self-assembly manner; the connectivity and compatibility between the amino-modified silicon-based material and the metal-modified aramid are good; and the shear thickening modified fiber prepared in the application can be used as an explosive-removing clothes material to block high-speed impact fragments in an explosive environment, and the penetration resistance and flame resistance of the composite material are enhanced.

Description

Technical Field

[0001] This invention relates to the field of bomb disposal suit protective materials technology, and in particular to a green bomb disposal suit protective material and its preparation method. Background Technology

[0002] Flexible protective materials effectively protect human safety. Flexible protective materials based on laminated textiles have become essential components of armor, providing protection against handgun fire and low-velocity explosive fragments. Therefore, the demand for flexible fabric protective materials in the impact resistance field is significant. Currently, armor is mostly made of laminated aramid fabrics, unidirectional fabrics (UD), or ultra-high molecular weight polyethylene (UHMWPE) fiber laminations. Aramid fabrics are synthesized from polymer materials and possess properties such as corrosion resistance, high temperature resistance, and UV resistance. Due to their lightweight and good protective characteristics, aramid fabrics have been widely used in soft ballistic protective equipment. Previous research has extensively studied their ballistic protection characteristics in different scenarios. With the continuous evolution of impact technology, weight and flexibility have a significant impact on personnel protection, necessitating improvements in the protective performance, flexibility, and lightweight of body armor.

[0003] Patent CN103753903B discloses a method for preparing a flame-retardant bulletproof composite material and the resulting composite material, comprising: uniformly mixing a catalyst, a carbonizing agent, and a foaming agent in a mass ratio of 5:3:2 to obtain an intumescent composite halogen-free flame retardant system; then mixing the intumescent composite halogen-free flame retardant system with a matrix resin to obtain a flame-retardant bulletproof composite matrix adhesive; then orthogonally laying and molding continuous fibers with the flame-retardant bulletproof composite matrix adhesive, and drying it with hot air to obtain a flame-retardant bulletproof composite material preform; finally, hot-pressing the flame-retardant bulletproof composite material preform to obtain the flame-retardant bulletproof composite material.

[0004] Patent CN111910436A discloses a shear-thickening protective liquid and its application, belonging to the technical field of shear-thickening liquids. The shear-thickening protective liquid of this invention is composed of polyethylene glycol, nano-silica powder, and boron carbide powder. Through the combined action of boron carbide particles and silica particles, this shear-thickening protective liquid increases friction, fully utilizing the principle of energy absorption through friction between particles. Furthermore, it reduces the degree of shear damage to fiber fabrics during impregnation, increasing the energy absorption of the fiber fabric by the projectile.

[0005] Patent CN107558228B relates to a method for preparing a shear-thickening liquid. The method specifically involves: adding a dispersion medium to a mixer, preheating the dispersion medium to 65°C–90°C, maintaining the temperature, adding nano-silica microspheres, mixing for the first time at a speed of 30–80 r / min for 15–40 minutes, then adding a silane coupling agent, mixing for the second time for 5–30 minutes, sealing and cooling to obtain the liquid.

[0006] Shear thickening fluid (STF) can ensure protection under multi-strain rate loads while reducing weight and improving mobility, making it an ideal material for protection upgrades. How to better introduce shear thickening fluid to enhance the elasticity of fabrics has become a mainstream research issue. Summary of the Invention

[0007] The purpose of this invention is to provide a green explosive ordnance disposal protective material and its preparation method, which involves impregnating an aramid fabric modified with metal ions with a shear-thickening liquid prepared from industrial solid waste, thereby solving the aforementioned technical problems.

[0008] The specific technical solution is a method for preparing green bomb disposal protective materials, which involves impregnating aramid fabric modified with metal ions with a shear thickening liquid prepared from industrial solid waste, and using the shear thickening liquid as a carrier to prepare composite fabric.

[0009] Preferably, the steps are as follows:

[0010] S1. Preparation of shear-thickening fluid: Industrial solid waste is introduced into the particle preparation process. By using surface inerting modification of the particles, the shear-thickening phenomenon is enhanced.

[0011] S2. Preparation of the modified fiber layer: The aramid fabric is modified with metal ions by impregnation.

[0012] S3. Preparation of composite fabric: The shear thickening liquid is impregnated with the metal ion modified fabric, and the shear thickening liquid is used as a carrier to prepare the composite fabric.

[0013] Preferably, step S1 includes:

[0014] S11. Solid waste substrate surface modification treatment: Industrial solid waste is activated by high-temperature calcination and then modified with sodium hydroxide to obtain alkali-modified high-temperature solid waste substrate.

[0015] S12. Based on the preparation of a solid waste-based gel dispersion, the alkali-modified solid waste base was first placed in a NaOH solution to obtain primary particles. The primary particles were then aged with ethanol and surface-modified with 3-aminopropyltrimethoxysilane in a constant-temperature water bath. After the reaction was complete, the product was washed with deoxygenated deionized water and other substances, and then dried in a drying oven to obtain an amino-modified solid waste base.

[0016] S13. Preparation of amino-modified solid waste-based shear thickening fluid: amino-modified solid waste-based fluid is used as the dispersed phase, and polyethylene glycol 1600 is used as the dispersion medium. The mass ratio of the dispersed phase to the dispersion medium is 50wt%-60wt%. A high-power stirrer is selected and a suitable rotation speed is used for uniform stirring to obtain a uniformly mixed amino-modified solid waste-based shear thickening fluid.

[0017] Preferably, in step S11, the calcination temperature is 700℃ and the sodium hydroxide concentration is 3.75%; in step S12, the mass ratio of alkali-modified solid waste base to NaOH solution is 1:2, the mass ratio of primary particles: ethanol: 3-aminopropyltrimethoxysilane is 1:2:1, and the temperature of the constant temperature water bath is 25℃; in step S13, a 200W JJ-1 type booster electric stirrer is selected, and the stirring time is 1 hour.

[0018] Preferably, after stirring, the sample is placed in a Branson ultrasonic instrument and sonicated for 0.2 hours at a test temperature of 25°C, and then dried in a vacuum drying oven for 12 hours.

[0019] Preferably, step S2 includes:

[0020] S21. Fiber surface pretreatment: The fiber surface is treated with a coupling agent.

[0021] S22. Metal ions are loaded onto aramid fabric by impregnation with metal nitrates. After stirring evenly, the fabric is sealed and left to stand. Then, it is placed in a vacuum drying oven for drying to obtain a modified fiber layer.

[0022] Preferably, in step S22, nitrates of Fe, Ni, Cu, and Zn are used.

[0023] Preferably, step S3 includes:

[0024] S31. Dilution of amino-modified solid waste-based shear thickening liquid: Dilute the amino-modified solid waste-based shear thickening liquid with anhydrous ethanol and then sonicate it in an ultrasonic instrument.

[0025] S32. Aramid loaded with amino-modified solid waste-based shear thickening liquid: The modified fiber layer is placed in diluted amino-modified solid waste-based shear thickening liquid. The impregnated fabric is then rolled to remove excess diluent while allowing the shear thickening liquid to fully penetrate into the gaps between the fabric fibers. The impregnated composite sample is then dried and allowed to stand.

[0026] The green bomb disposal suit protective material is a composite fabric prepared using the above-mentioned preparation method.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. Based on the important application background of shear-thickening composite materials, this invention first develops a method for preparing amino-modified solid waste-based shear-thickening fluid, realizing the resource utilization of solid waste.

[0029] 2. After the fibers are modified with metal ions, the dispersed phase particles can effectively adhere to the aramid surface through self-assembly after impregnation with a shear thickening solution. The connection and compatibility between the ammonia-modified silicon-based material and the metal-modified aramid are good.

[0030] 3. Using the shear-thickening modified fiber prepared in this invention as a bomb disposal suit material can effectively block high-speed impact fragments in an explosive environment, enhancing the composite material's penetration resistance and flame retardancy. This provides a reliable research foundation for exploring the protective performance of composite materials.

[0031] 4. This invention combines macroscopic rheological behavior measurement with microstructural evolution to explore the basic mechanical properties and impact resistance of NH4-SA@STF / FE-AF fabrics, and investigates the impact resistance mechanism of NH4-SA@STF / FE-AF fabric composites. This provides theoretical support and experimental basis for the development of novel protective materials made of NH4-SA@STF / FE-AF fabrics and their application in engineering practice.

[0032] In summary, this invention provides an impact-shear-thickened composite flexible material with strong impact resistance, excellent comfort, lighter weight, and stronger flame retardant properties, for use in personnel protection in explosive environments. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 These are scanning electron microscope images of the fabric.

[0035] (a) Original aramid fabric,

[0036] (b) Amino-modified solid waste-based shear thickening liquid / Fe metal-modified aramid fabric. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0038] In the description of this invention, it should be noted that the terms "inner", "outer", "left", and "right" indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] A method for preparing a green bomb disposal suit protective material involves impregnating a shear thickening liquid prepared from industrial solid waste with an aramid fabric modified with metal ions, and using the shear thickening liquid as a carrier to prepare a composite fabric.

[0040] This application not only introduces industrial solid waste into the pellet preparation process, enhancing environmental protection and resource utilization, but also enhances the shear thickening phenomenon by employing surface inerting modification of the pellets. Furthermore, it modifies aramid fabrics with metal ions, increasing the roughness of the fiber fabric and facilitating complexation and grafting reactions by loading metal ions onto the surface. Finally, it impregnates the shear thickening liquid with the metal ion-modified fabric, using the shear thickening liquid as a carrier to prepare an impact-resistant, shear-thickened composite flexible material with strong impact resistance, excellent comfort, lighter weight, and stronger flame retardant properties. The composite material's performance is mainly reflected in the impregnation of high-performance fabrics with shear thickening liquid (STF), the improvement of fabric surface roughness, the surface grafting of the aramid fabric matrix, and the hybridization of different fiber materials. The main purpose is to increase the friction of the yarn during impact, thereby increasing the energy dissipation of external forces. This provides guidance for the design of high-performance soft bulletproof vests and also contributes to the resource utilization and high-value utilization of solid waste.

[0041] In one embodiment, the steps are as follows:

[0042] S1. Preparation of shear-thickening fluid: Industrial solid waste is introduced into the particle preparation process. By using surface inerting modification of the particles, the shear-thickening phenomenon is enhanced.

[0043] S2. Preparation of the modified fiber layer: The aramid fabric is modified with metal ions by impregnation.

[0044] S3. Preparation of composite fabric: The shear thickening liquid is impregnated with the metal ion modified fabric, and the shear thickening liquid is used as a carrier to prepare the composite fabric.

[0045] In one embodiment, step S1 includes:

[0046] S11. Solid waste substrate surface modification treatment: Industrial solid waste is activated by high-temperature calcination and then modified with sodium hydroxide to obtain alkali-modified high-temperature solid waste substrate.

[0047] S12. Based on the preparation of a solid waste-based gel dispersion, the alkali-modified solid waste base was first placed in a NaOH solution to obtain primary particles. The primary particles were then aged with ethanol and surface-modified with 3-aminopropyltrimethoxysilane in a constant-temperature water bath. After the reaction was complete, the product was washed with deoxygenated deionized water and other substances, and then dried in a drying oven to obtain an amino-modified solid waste base.

[0048] S13. Preparation of amino-modified solid waste-based shear thickening fluid: amino-modified solid waste-based fluid is used as the dispersed phase, and polyethylene glycol 1600 is used as the dispersion medium. The mass ratio of the dispersed phase to the dispersion medium is 50wt%-60wt%. A high-power stirrer is selected and a suitable rotation speed is used for uniform stirring to obtain a uniformly mixed amino-modified solid waste-based shear thickening fluid.

[0049] In one embodiment, in step S11, the calcination temperature is 700℃ and the sodium hydroxide concentration is 3.75%; in step S12, the mass ratio of alkali-modified solid waste base to NaOH solution is 1:2, the mass ratio of primary particles: ethanol: 3-aminopropyltrimethoxysilane is 1:2:1, and the temperature of the constant temperature water bath is 25℃; in step S13, a 200W JJ-1 type booster electric stirrer is selected, and the stirring time is 1 hour.

[0050] In one embodiment, after stirring, the sample is placed in a Branson ultrasonic instrument and sonicated for 0.2 hours at a test temperature of 25°C, and then placed in a vacuum drying oven to dry for 12 hours.

[0051] In one embodiment, step S2 includes:

[0052] S21. Fiber surface pretreatment: The fiber surface is treated with a coupling agent.

[0053] S22. Metal ions are loaded onto aramid fabric by impregnation with metal nitrates. After stirring evenly, the fabric is sealed and left to stand. Then, it is placed in a vacuum drying oven for drying to obtain a modified fiber layer.

[0054] In one embodiment, step S22 uses nitrates of Fe, Ni, Cu, and Zn.

[0055] In one embodiment, step S3 includes:

[0056] S31. Dilution of amino-modified solid waste-based shear thickening liquid: Dilute the amino-modified solid waste-based shear thickening liquid with anhydrous ethanol and then sonicate it in an ultrasonic instrument.

[0057] S32. Aramid loaded with amino-modified solid waste-based shear thickening liquid: The modified fiber layer is placed in diluted amino-modified solid waste-based shear thickening liquid. The impregnated fabric is then rolled to remove excess diluent while allowing the shear thickening liquid to fully penetrate into the gaps between the fabric fibers. The impregnated composite sample is then dried and allowed to stand.

[0058] The green bomb disposal suit protective material is a composite fabric prepared using the above-mentioned preparation method.

[0059] Example 1: A method for preparing a green bomb disposal suit protective material:

[0060] S1. Preparation of shear thickening fluid: The shear thickening fluid introduces industrial solid waste into the particle preparation process, enhancing environmental protection and resource utilization. It enhances the shear thickening phenomenon by employing surface inerting modification of the particles.

[0061] S2. Preparation of the modified fiber layer: The modified fiber layer involves modifying the aramid fabric with metal ions to increase the roughness of the fiber fabric. The surface loaded with metal ions facilitates complexation and grafting reactions.

[0062] S3. Preparation of composite fabrics: A shear-thickening liquid is impregnated with a metal ion-modified fabric, using the shear-thickening liquid as a carrier to prepare the composite fabric.

[0063] Step S1 includes:

[0064] S101. Surface modification treatment of solid waste substrate: The sewage sludge used in the experiment was taken from a sewage treatment plant in Qingdao City, Shandong Province. The sludge contains heavy metals, organic toxic substances, and pathogenic microorganisms that are harmful to the ecological environment and human health. Therefore, it is generally treated by high-temperature calcination, also known as sludge physical activation, when reused. Preliminary experiments were conducted to study the activation temperature and acid-base oxidation. The optimal process was finally selected, with an optimal calcination temperature of 700℃. Alkali modification with sodium hydroxide (NaOH, 3.75% concentration) was used to obtain alkali-modified solid waste substrate.

[0065] Analysis of solid waste-based materials modified by alkali at high temperature revealed the formation of a rich porous structure on the surface of the sludge. Industrial elemental analysis showed that the activated materials mainly consisted of silicon dioxide (SiO2, 77.6%), calcium carbonate (CaCO3, 8.5%), and aluminum oxide (Al2O3, 7.2%).

[0066] S102. Based on solid waste-based gel dispersion, municipal sludge, whose main component is SiO2, contains sufficient silicon source and is a potential material for preparing shear-thickening liquids. High-temperature calcined and alkali-modified materials were placed in NaOH solution at a 1:2 ratio. Under alkali catalysis, the particle surface was activated, mainly improving particle dispersibility and stability, resulting in modified materials. The particles were then aged in 50% ethanol (EtOH) and surface-modified with 3-aminopropyltrimethoxysilane for 12 hours. The mass ratio of the three samples was 1:2:1. Modification was mainly carried out in a constant-temperature water bath at 25℃. After the reaction, the material samples were washed with simple and stable deoxygenated deionized water and dried in a drying oven for 12 hours, finally obtaining ammonia-modified silicon-based materials.

[0067] S103. Preparation of Amino-Modified Solid Waste-Based Shear Thickening Liquid: In preparing the amino-modified solid waste-based shear thickening liquid, amino-modified solid waste was selected as the dispersed phase, and polyethylene glycol 1600 (PEG) was selected as the dispersion medium. The mass ratio of dispersed phase to dispersion medium was 50wt% and 60wt%, respectively. During the preparation of the shear thickening liquid, the thickening effect became more obvious as the volume fraction of dispersed phase particles increased. Therefore, a higher-powered stirrer and an appropriate rotation speed were required for uniform stirring.

[0068] S104, the amino-modified solid waste-based shear thickening liquid was preserved. A 200W JJ-1 type electric stirrer was used for 1 hour of stirring. During stirring, to prevent splashing of dispersed phase particles, the liquid was slowly added to the stirring beaker. After stirring, the sample was ultrasonicated in a Branson ultrasonic instrument for 0.2 hours at 25℃, and then dried in a vacuum drying oven for 12 hours to remove air bubbles. The resulting uniformly mixed amino-modified solid waste-based shear thickening liquid was then sealed and stored.

[0069] The rheological properties of the amino-modified solid waste-based shear thickener were tested using a rheometer (MCR302) in both steady-state and dynamic shear modes. The steady-state rheological experiment was conducted at a constant temperature of 35℃ with a shear rate range of 0.04–1000 s⁻¹. -1 The dynamic rheological experiment was conducted under the following conditions: strain γ = 0.15, angular frequency range of 1–100 rad / s, and the variation of composite viscosity with angular frequency was calculated.

[0070] During steady-state flow performance testing, when the volume fraction of the amino-modified solid waste base was 60 wt%, the viscosity after shear thickening increased from 98 Pa·s to 823 Pa·s, an increase of 739.79%. The critical shear rate also increased from 99.12 s⁻¹ compared to when the volume fraction of the amino-modified solid waste base was 50 wt%. -1 Reduced to 22.35s -1 The viscosity decreased by 77.47%. However, when the solid waste base volume fraction was 60 wt% and 50 wt%, the shear thickening viscosity and critical shear rate were worse than those of the amino-modified solid waste base. In dynamic flow property testing, a linear relationship was initially observed. Upon reaching the critical angular frequency, the composite viscosity increased rapidly. When the volume fraction of the amino-modified solid waste base was 60 wt%, the critical angular frequency decreased by 65.38% compared to 50 wt%, while the maximum modulus at the same angular frequency increased by 612.37%.

[0071] Shear-thickening solutions are formed through hydrogen bonding between amino-modified solid waste particles and PEG-1600. The surface of the amino-modified solid waste particles is rich in OH bonds, which contribute to a more effective increase in viscosity compared to commonly used particles such as silica. These hydrogen bonds play a crucial role in the thickening mechanism of shear-thickening solutions, leading to an increase in viscosity under shear stress. The presence of OH bonds on the surface of the amino-modified solid waste particles facilitates strong intermolecular interactions with PEG-1600, resulting in a more pronounced thickening effect.

[0072] Step S2 includes:

[0073] S201. Preliminary experiment on fiber surface roughening treatment: The preliminary experiment found that treating the fiber surface with a coupling agent can better achieve the adhesion of metal ions; the purpose of metal modification of the fiber is to better achieve particle grafting, increase its friction properties, and improve its protective ability.

[0074] S202, Metal Modification of Fiber Interface: The experiments used Fe, Ni, Cu, and Zn nitrates, all purchased from Beijing Kebang Chemical Reagent Factory. Metal ions were loaded onto aramid fabrics via impregnation, and the nitrate solution completely covered the aramid fabric. After thorough mixing, the four samples were sealed and allowed to stand for 24 hours, then placed in a vacuum drying oven for 48 hours to obtain different metal ion modifications.

[0075] Analysis of the advantages of Fe metal modification shows that after the fiber is modified by metal ions, the dispersed phase particles can be effectively attached to the surface of aramid in a self-assembly manner after being impregnated with shear thickening liquid. The connection and compatibility between the ammonia-modified silicon material and the metal-modified aramid are good, and there are no serious voids or particle agglomeration phenomena.

[0076] Step S3 includes:

[0077] S301. Dilution of the amino-modified solid waste-based shear thickening solution: Before impregnation experiments with the amino-modified solid waste-based shear thickening solution, it is diluted because the solution is too viscous. Anhydrous ethanol is used as the diluent, with a ratio of 1:3 between the amino-modified solid waste-based shear thickening solution and anhydrous ethanol. The solution is then sonicated in an ultrasonic instrument for 0.2 hours.

[0078] S302. Aramid-loaded amino-modified solid waste-based shear thickening liquid: Aramid fabric is laid flat and immersed in diluted polydisperse amino-modified solid waste-based shear thickening liquid, ultrasonically dispersed for 25 minutes. The fabric is then removed and placed in a rolling mill after startup, and the amino-modified solid waste-based shear thickening liquid / metal-modified aramid fabric is rolled once under suitable pressure. This removes excess diluent while allowing the shear thickening liquid to fully penetrate into the gaps between the fabric fibers. To ensure uniform impregnation, the sample needs to be repeated three times.

[0079] S303, Preparation of composite fabric: The sample after impregnation and composite is dried for 48 hours and then left to stand for another 24 hours. The purpose is to allow the anhydrous ethanol in the amino-modified solid waste-based shear thickening liquid / metal-modified aramid fabric to fully evaporate.

[0080] Example 2: Based on Example 1, the excellent performance of Fe metal modification was found. After the fiber was modified with metal ions and impregnated with shear thickening liquid, the dispersed phase particles could effectively attach to the aramid surface in a self-assembly manner. The connection and compatibility between the ammonia-modified silicon material and the metal-modified aramid were good, and there were no serious voids or particle agglomeration.

[0081] A cellulose ether modified with Fe nitrate was used to prepare an amino-modified solid waste-based shear thickener / Fe metal-modified aramid fabric, abbreviated as NH4-SA@STF / FE-AF fabric. Physical properties were tested, and the relevant test results are described below:

[0082] 1. Appearance and quality

[0083] from Figure 1 It can be seen that the color of the NH4-SA@STF / FE-AF fabric after composite impregnation is darker than that of pure aramid. The areal density of the NH4-SA@STF / FE-AF fabric ranges from 229 to 241 g / cm³. 2 Compared to pure fabric 200g / cm 2 Compared to the areal density, the mass gain of impregnated fabrics is between 15.5% and 19.5%.

[0084] 2. Inter-yarn friction behavior

[0085] Fabric protective capabilities are generally reflected in the frictional behavior between yarns. The yarn pull-out test is often used to detect yarn frictional behavior, thereby calculating the difference in friction within the entire fabric. The single yarn pull-out test uses an instrument (Instron 4411). When placing the sample, the lower edge of the test sample is clamped, while the upper edge is allowed to move freely. To avoid generating pre-tension in the yarn, the yarn is loosely clamped.

[0086] The center yarn was selected for pull-out tests. The experimental sample fabric was 16 mm long and 4 mm wide. The center warp yarn was pulled out at speeds of 10 mm / min, 50 mm / min, 100 mm / min and 200 mm / min respectively, and the load-displacement data was recorded by software.

[0087] Under low-speed drawing conditions, the pull force of NH4-SA@STF / FE-AF fabric is around 18N, which is three times that of pure AF fabric yarn. Under high-speed drawing conditions, the pull force of NH4-SA@STF / FE-AF fabric is around 22N, which is 4.5 times that of pure AF fabric yarn. This is mainly because the shear rate corresponding to high-speed drawing is greater than the critical shear rate. The shear thickening fluid penetrating the yarn produces a shear thickening effect, and the loaded grafted dispersed phase particles form particle clusters, further increasing friction and yarn movement resistance.

[0088] 3. Flame retardant properties

[0089] According to the method described in GB / T5454—1997 "Determination of Burning Performance of Textiles - Oxygen Index Method", the limiting oxygen index (LOI) tests were performed on the flame-retardant fabrics prepared by Examples 1-9 and the comparative examples. Generally, LOI values ​​below 20% are considered flammable fibers, between 20% and 26% are considered combustible fibers, between 26% and 34% are considered flame-retardant fibers, and above 35% are considered non-combustible fibers.

[0090] Aramid fabrics were impregnated with an amino-modified solid waste-based shear thickening solution. Because the amino-modified solid waste-based shear thickening solution is viscous, it was diluted with three times its volume of anhydrous ethanol and poured into an ultrasonic cleaner. The aramid fabric was then laid flat and immersed in the diluted polydisperse amino-modified solid waste-based shear thickening solution and ultrasonically dispersed for 25 minutes. The fabric was then removed and placed in a starting rolling mill, where it was rolled once under suitable pressure. To ensure uniform impregnation, the sample needed to be repeated three times.

[0091] The flame retardant properties of the prepared composite fabric and the original fabric were tested three times. The final measured oxygen index (LOI) value of the original fabric was 29.3%, while that of the NH4-SA@STF / FE-AF fabric was 30.2%. The flame retardant effect was synergistically enhanced, and the amino-modified solid waste-based shear thickening liquid achieved excellent technical results.

[0092] 4. High-speed impact test

[0093] To compare and evaluate the differences in the impact resistance of NH4-SA@STF / FE-AF fabrics under high-speed impact, steel ball projectiles with a diameter of 5 mm and a weight of 2 g were selected for the test. The experiment was conducted using a ballistic gun testing device, in which the air pressure in the gas chamber was varied to obtain different velocities within the range of 40-250 m / s, thereby testing the ballistic limit velocity V of the test sample. 50 .

[0094] The experiment employed two high-speed cameras. One camera measured the instantaneous velocities before and after the projectile impact, labeling them as the initial and residual velocities. The energy absorption of the fabric was calculated from the impact and residual velocities. The other camera recorded the projectile impact location, back-thrust distance, and fiber breakage pattern. The target plate had external dimensions of 18×18cm and internal window dimensions of 16×16cm. It was fixed at four corners, with stainless steel frames clamping the four corners of the sample.

[0095] Ballistic limiting velocities were fitted between NH4-SA@STF / FE-AF fabric and aramid fabric. Compared with aramid fabric, the ballistic limiting velocity of NNH4-SA@STF / FE-AF fabric was 98 m / s, while that of pure AF fabric was 52 m / s.

[0096] The process of the projectile impacting, stretching, and penetrating the fiber panel is observed. During the impact, conical deformation is observed, exhibiting a classic rhomboid deformation region, a common phenomenon in ordinary aramid fiber materials.

[0097] The back protrusion size of pure aramid fabrics ranges from 3.26 to 4.11 mm, while the back protrusion size of Fe metal-modified aramid fabrics impregnated with amino-modified solid waste-based shear thickening liquid is 2.12 to 2.63 mm, significantly reducing the back protrusion height. The study compared the impact, stretching, and penetration processes of various samples by projectiles at different speeds on the fiber panel. The figures show that projectile impact on pure aramid fabrics creates a large-area "windowing effect" in the warp and weft directions, with yarn deformation and stretching being the primary failure mode. Conversely, the primary failure mode of Fe metal-modified aramid fabrics impregnated with amino-modified solid waste-based shear thickening liquid is yarn breakage, and the lateral slip distance is also significantly reduced.

[0098] 5. Ballistic Limit Velocity Comparison Test

[0099] To compare and evaluate the differences in high-speed impact between NH4-SA@STF / FE-AF fabric and amino-modified solid waste-based shear thickener / aramid fabric, the method in the "High-Speed ​​Impact Test" was used.

[0100] Ballistic limiting velocities were fitted between NH4-SA@STF / FE-AF fabric and amino-modified solid waste-based shear thickener / aramid fabric. Compared with aramid fabric, the ballistic limiting velocity of NH4-SA@STF / FE-AF fabric increased from 75 m / s to 98 m / s, representing a 31% increase.

[0101] 6. Comparison Test of the Ultimate Velocity of Multi-Layered Ballistics

[0102] To verify whether NH4-SA@STF / FE-AF fabrics, when laminated in multiple layers, offer better protection than aramid multilayers, ballistic limit tests were conducted on single-layer, double-layer, and triple-layer NH4-SA@STF / FE-AF fabrics.

[0103] By testing the ballistic limits and energy absorption efficiency of each layer of NH4-SA@STF / FE-AF fabric and aramid fabric, the experimental results showed that the ballistic limit velocities of the first, second, and third layers of NH4-SA@STF / FE-AF fabric were 99 m / s, 127 m / s, and 162 m / s, respectively, while the ballistic limit velocities of the first, second, and third layers of aramid fabric were 52 m / s, 97 m / s, and 126 m / s, respectively.

[0104] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing a green bomb disposal suit protective material, characterized in that, A shear-thickening liquid prepared from industrial solid waste was impregnated with aramid fabric modified with metal ions, and a composite fabric was prepared using the shear-thickening liquid as a carrier. S1. Preparation of shear thickening fluid: Industrial solid waste is introduced into the particle preparation process. By using surface inerting modification of the particles, the shear thickening phenomenon is enhanced. S2. Preparation of the modified fiber layer: The aramid fabric is modified with metal ions by impregnation. S3. Preparation of composite fabrics: A shear-thickening liquid is impregnated with a metal ion-modified fabric, using the shear-thickening liquid as a carrier to prepare the composite fabric. Among them, S11, solid waste base surface modification treatment, uses high-temperature calcination to activate industrial solid waste, and uses sodium hydroxide for alkali modification to obtain alkali-high temperature modified solid waste base. S 12. Based on the preparation of a solid waste-based gel dispersion, the alkali-modified high-temperature solid waste-based material is first placed in a NaOH solution to obtain primary particles; the primary particles are then aged with ethanol and surface modified with 3-aminopropyltrimethoxysilane in a constant-temperature water bath; after the reaction is completed, the product is washed with deoxygenated deionized water and other substances, and then dried in a drying oven to obtain an amino-modified solid waste-based material. Among them, S21, fiber surface pretreatment, involves treating the fiber surface with a coupling agent. S22. Metal ions are loaded onto aramid fabric by impregnation with metal nitrates. After stirring evenly, the fabric is sealed and left to stand. Then, it is placed in a vacuum drying oven for drying to obtain a modified fiber layer.

2. The method for preparing the green bomb disposal suit protective material according to claim 1, characterized in that, Step S1 includes: S 13. Preparation of amino-modified solid waste-based shear thickening fluid: amino-modified solid waste-based fluid is used as the dispersed phase, and polyethylene glycol 1600 is used as the dispersion medium. The mass ratio of the dispersed phase to the dispersion medium is 50wt%-60wt%. A stirrer is used to stir the fluid evenly to obtain a uniformly mixed amino-modified solid waste-based shear thickening fluid.

3. The method for preparing the green bomb disposal suit protective material according to claim 2, characterized in that, In step S11, the calcination temperature is 700℃ and the sodium hydroxide concentration is 3.75%; in step S12, the mass ratio of alkali-modified solid waste base to NaOH solution is 1:2, the mass ratio of primary particles: ethanol: 3-aminopropyltrimethoxysilane is 1:2:1, and the temperature of the constant temperature water bath is 25℃; in step S13, a 200W JJ-1 type booster electric stirrer is selected, and the stirring time is 1 hour.

4. The method for preparing the green bomb disposal suit protective material according to claim 3, characterized in that, After stirring, the sample was placed in a Branson ultrasonic instrument and sonicated for 0.2 hours at a test temperature of 25°C, and then dried in a vacuum drying oven for 12 hours.

5. The method for preparing the green bomb disposal suit protective material according to claim 1, characterized in that, In step S22, nitrates of Fe, Ni, Cu, and Zn are used.

6. The method for preparing the green bomb disposal suit protective material according to claim 5, characterized in that, Step S3 includes: S31. Dilution of amino-modified solid waste-based shear thickening liquid: Dilute the amino-modified solid waste-based shear thickening liquid with anhydrous ethanol and then sonicate it in an ultrasonic instrument. S32. Aramid loaded with amino-modified solid waste-based shear thickening liquid: The modified fiber layer is placed in diluted amino-modified solid waste-based shear thickening liquid. After impregnation, the fabric is rolled to remove excess diluent while allowing the shear thickening liquid to fully penetrate into the gaps between the fabric fibers. The impregnated composite sample is then dried and left to stand.

7. Green bomb disposal suit protective material, characterized in that, Composite fabric prepared by any one of claims 1-6.

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