Nanocomposite ionic gel material with impact resistance and preparation method thereof

Abstract

The application discloses a kind of nanometer composite ionic gel materials with impact resistance and a preparation method thereof, and belongs to the field of polymer composite materials.The application prepares a solvent by mixing and heating 5-methyl-2-isopropyl phenol and tetrabutylammonium tetrafluoroborate, then adds isobornyl acrylate, hexafluorobutyl acrylate, KH570 modified silicon dioxide nanoparticles, 2,6-diphenyl phenoxy ethyl acrylate, a photoinitiator and a crosslinking agent in the solvent, and the nanometer composite ionic gel material can be obtained after photopolymerization.The nanometer composite ionic gel material prepared by the application is soft and has low modulus in normal state, but when subjected to high-speed impact, rapid and efficient energy dissipation occurs inside, the modulus sharply rises, and the intelligent protection effect of "encountering rigidity to be rigid, encountering softness to be soft" can be realized.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite materials, specifically relating to an impact energy absorbing material based on ion gel. Background Technology

[0002] Impact-resistant materials are in high demand across various industrial sectors, including automotive and personal protective equipment. Over millions of years of evolution, nature has developed ingenious solutions to address impact challenges. For example, the mantis shrimp's malleus dissipates energy through a multi-scale hierarchical structure (mineralized nanomaterials combined with elastic biopolymers); many echinoderms, such as sea cucumbers, can reversibly alter the stiffness of their inner dermis in response to external stimuli, exhibiting stimulus-response and mechanical adaptation characteristics. Inspired by this, ideal engineering impact-resistant materials should possess similar intelligent response characteristics: firstly, remaining soft under everyday use conditions to ensure comfort; and secondly, rapidly hardening during dynamic impact events to dissipate energy with extremely high efficiency and protect the target object. Although traditional materials such as ceramics, metals, and alloys have made significant progress in impact resistance, their bulkiness, high stiffness, and low energy dissipation rate limit their applications. Therefore, the development of lightweight, high-strength, and high-energy-dissipation impact-resistant materials has become an urgent need.

[0003] Currently, gels used for impact protection mainly include traditional hydrogels, ionomers, and dual-network gels. Although these materials exhibit certain flexibility and buffering capacity under static or low-velocity loads, they face significant technical bottlenecks in dealing with high-speed, high-energy impacts, primarily in the following aspects:

[0004] 1. Insufficient static and dynamic modulus: Most flexible gels typically have a compressive modulus below 10 MPa, failing to provide sufficient rigidity to resist severe impact deformation. Although some gels reinforced by nanocomposites or dual-network structures have improved their static modulus, it still falls short of the required modulus of up to 5000 s⁻¹. -1 At even higher strain rates, its dynamic modulus is often far below 50 MPa, and the energy dissipation capacity quickly reaches saturation, leading to protection failure.

[0005] 2. Lack of significant "impact hardening" effect: The energy dissipation mechanism of existing gel materials mostly relies on the viscous relaxation of molecular chains or the breaking of single dynamic bonds. Their mechanical response does not change drastically with strain rate, that is, they lack strong strain sensitivity (impact hardening effect). This results in the material being too hard at low speeds, affecting comfort, while it is not hard enough to provide effective protection under high-speed impacts, failing to achieve intelligent "on-demand protection".

[0006] 3. Structural instability under high strain rates: Under extremely high impact loads, the polymer network of existing gels is prone to catastrophic and irreversible fracture due to its singular energy dissipation mechanism and limited energy transfer rate. Its internal network cannot adapt to and disperse impact stress through rapid and reversible structural reorganization, leading to structural collapse.

[0007] The main reason for the above three problems lies in the limitations of the existing micro-network structure design of gel materials. Their network structures are either too rigid and lack dynamic reconfiguration capabilities, or too flexible and lack sufficient energy dissipation sites. Secondly, when water is used as a gel medium, it is incompressible and cannot dissipate energy through volume contraction. However, upon impact, it is forced to migrate violently out of the impacted area, causing seepage and generating enormous shear forces on the polymer network, leading to material failure.

[0008] Therefore, there is an urgent need in this field to develop a new type of gel material that not only has suitable mechanical properties under normal conditions, but more importantly, exhibits extremely high dynamic modulus and strong impact hardening effect under ultra-high strain rate impact, thereby providing a disruptive solution for impact protection under extreme working conditions. Summary of the Invention

[0009] Existing impact-resistant gels, such as polyurethane elastomers and polyvinyl alcohol gels, typically require high crosslinking density or the introduction of rigid segments to increase modulus in order to achieve high energy dissipation capabilities. However, this leads to problems such as material hardness and brittleness, poor fit, and low wearing comfort, severely limiting their application in flexible protective gear, wearable devices, and other fields. The purpose of this invention is to solve the problems existing in the prior art and provide a nanocomposite ionogel material with impact-resistant properties and its preparation method.

[0010] The specific technical solution adopted in this invention is as follows:

[0011] In a first aspect, the present invention provides a method for preparing a nanocomposite ionogel material with impact-resistant properties, comprising:

[0012] S1. Mix 5-methyl-2-isopropylphenol and tetrabutylammonium tetrafluoroborate at a molar ratio of (3~1):1, and then heat the mixture at 80~90℃ for 1~2 hours until a transparent hydrophobic eutectic solvent is obtained.

[0013] S2. Isoborneol acrylate (IBA), hexafluorobutyl acrylate (HFBA), KH570 modified silica nanoparticles, and 2,6-diphenylphenoxyethyl acrylate are mixed evenly in a mass ratio of (5.5~6.5):(8.2~9.2):(0.5~1.5):(0.5~1.5) to obtain a pre-solution;

[0014] S3. Mix the pre-solution and hydrophobic eutectic solvent at a mass ratio of (0.8~1.1):(0.15~0.25), add the photoinitiator and crosslinking agent, and then mix and disperse by ultrasonic stirring to obtain the precursor solution;

[0015] S4. Pour the precursor solution into a mold, seal it, and then cure it under ultraviolet light to obtain a nanocomposite ionogel material.

[0016] As a preferred embodiment of the first aspect above, the molar ratio of 5-methyl-2-isopropylphenol to tetrabutylammonium tetrafluoroborate is 2:1.

[0017] As a preferred embodiment of the first aspect above, the method for synthesizing the 2,6-diphenylphenoxyethyl acrylate is as follows: 2,6-diphenylphenol and 2-bromoethanol are dissolved in N,N dimethylformamide, potassium carbonate is added, and the mixture is stirred at 85-95°C until fully reacted. The mixture is then separated and purified to obtain 2-(2,6-diphenylphenoxy)ethanol. 2-(2,6-diphenylphenoxy)ethanol and triethylamine are then dissolved in dichloromethane, stirred in an ice bath until well mixed, and acryloyl chloride is added until fully reacted. The mixture is then separated and purified to obtain 2,6-diphenylphenoxyethyl acrylate.

[0018] As a preferred embodiment of the first aspect above, the molar ratio of the mixture of 2,6-diphenylphenol and 2-bromoethanol is 1:1, and the molar ratio of the mixture of 2-(2,6-diphenylphenoxy)ethanol and triethylamine is 1:3.

[0019] As a preferred embodiment of the first aspect above, the photoinitiator is photoinitiator 1173.

[0020] As a preferred embodiment of the first aspect above, the crosslinking agent is ethylene glycol dimethacrylate (EDGMA).

[0021] As a preferred embodiment of the first aspect above, the added photoinitiator and crosslinking agent are respectively 0.05% to 0.1% of the total mass of the precursor solution.

[0022] As a preferred embodiment of the first aspect above, the duration of ultrasonic stirring is 20 to 40 minutes.

[0023] As a preferred embodiment of the first aspect above, the ultraviolet light used for ultraviolet curing is 365nm wavelength and the ultraviolet light irradiation time is 2.5~3h.

[0024] In a second aspect, the present invention provides a nanocomposite ionogel material with impact resistance prepared according to the preparation method described in any of the embodiments of the first aspect above.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention provides a nanocomposite gel material with excellent compressive properties, exhibiting a compressive modulus of 84.6 MPa when compressed to 80%. Furthermore, this material possesses properties similar to non-Newtonian fluids (i.e., impact hardening properties): at low strain rates, the gel material exhibits softness similar to soft tissue; at higher strain rates, it exhibits the compressive strength of engineering plastics. Hopkinson bar tests simulating high-speed impacts show that this material exhibits impact hardening properties at 5000 s⁻¹. -1 The material exhibits an impact stress of 233.5 MPa under strain rate, which is significantly higher than that reported in current impact-resistant gel materials. The nanocomposite ionogel material prepared in this invention can achieve an intelligent protective effect of being "hard when encountering hard objects and flexible when encountering soft objects." Attached Figure Description

[0027] Figure 1 A schematic diagram of the preparation steps of a nanocomposite ionogel material with impact resistance;

[0028] Figure 2 The first-step synthesis reaction of 2,6-diphenylphenoxyethyl acrylate and the 1H NMR spectrum of the product;

[0029] Figure 3 The second-step synthesis reaction of 2,6-diphenylphenoxyethyl acrylate and the 1H NMR spectrum of the product;

[0030] Figure 4 The figures show the compressive stress-strain curves of the nanocomposite gel materials prepared by changing the nanoparticle content and adjusting the monomer ratio in Examples 1-5 of this invention.

[0031] Figure 5 The stress-strain curves of the nanocomposite ionogel in Example 1 of this invention under different compression rates are shown.

[0032] Figure 6 The values ​​represent the dissipation energy and energy dissipation rate of the nanocomposite ion gel at different rates calculated in Example 1 of this invention.

[0033] Figure 7 This is the rheological curve of the nanocomposite ionogel in Example 1 of the present invention over a wide frequency range.

[0034] Figure 8 The nanocomposite ionogel in Example 1 of this invention was subjected to different loading rates (500, 1000, 2000, 4000, 5000 s). -1 The true compressive stress-strain curve.

[0035] Figure 9 This is a stress comparison diagram between the nanocomposite ionogel in Example 1 of the present invention and the previously reported impact-resistant materials. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Technical features in various embodiments of the present invention can be combined accordingly without mutual conflict.

[0037] like Figure 1 As shown, this invention provides a method for preparing a nanocomposite ionogel material with impact-resistant properties, the specific steps of which are as follows:

[0038] S1. Preparation of hydrophobic eutectic solvent: Mix 5-methyl-2-isopropylphenol and tetrabutylammonium tetrafluoroborate at a molar ratio of (3~1):1, and place them in an oil bath at a reaction temperature of 80~90℃ for 1~2 hours (stop when the solution becomes transparent). The thermal reaction needs to be stirred throughout until a transparent hydrophobic eutectic solvent is obtained.

[0039] S2. Preparation of presol: Isoborneol acrylate (IBA), hexafluorobutyl acrylate (HFBA), KH570 modified silica nanoparticles and 2,6-diphenylphenoxyethyl acrylate are mixed evenly in a mass ratio of (5.5~6.5):(8.2~9.2):(0.5~1.5):(0.5~1.5) to obtain a presol.

[0040] S3. Preparation of precursor solution: Mix the pre-solution and hydrophobic eutectic solvent at a mass ratio of (0.8~1.1):(0.15~0.25), add photoinitiator and crosslinking agent, and stir ultrasonically for 20~40 minutes to fully mix and disperse to obtain precursor solution.

[0041] S4. Preparation of nanocomposite ionogel material: The precursor solution is poured into a mold and sealed, then placed in a UV curing chamber and cured by UV light irradiation to obtain nanocomposite ionogel material.

[0042] The material selection, dosage, and process parameters for each step in the above preparation method can be optimized according to actual performance requirements. The mold used must match the shape of the gel material to be processed; specific mold shapes are not limited.

[0043] In embodiments of the present invention, the molar ratio of 5-methyl-2-isopropylphenol to tetrabutylammonium tetrafluoroborate is preferably 2:1. Photoinitiator 1173 is preferably used, and crosslinking agent ethylene glycol dimethacrylate (EDGMA) is preferably used. The mass of the added photoinitiator is preferably 0.05% to 0.1% of the total mass of the precursor solution. The mass of the added crosslinking agent is preferably 0.05% to 0.1% of the total mass of the precursor solution. The ultrasonic stirring time is preferably 20 to 40 minutes to ensure that the nanomaterials are uniformly dispersed in the precursor solution. The ultraviolet light wavelength used for ultraviolet curing in the ultraviolet curing chamber is preferably 365 nm, and the ultraviolet light irradiation time is preferably 2.5 to 3 hours.

[0044] It should also be noted that the KH570 modified silica nanoparticles in this invention can be commercially available materials or can be obtained by modification. The modification steps are shown in a) to c) below:

[0045] Step a) Disperse silica powder (preferably with a particle size of 20~30nm) in a certain volume of anhydrous ethanol, and sonicate or stir at high speed for 15min. Use the stable suspension formed after stirring evenly as a solvent, wherein the mass percentage of silica is 10wt.

[0046] Step b) Dissolve the KH570 solution in anhydrous ethanol at a volume ratio of 1:5, add a small amount of water (water to KH570 volume ratio of 1:15), adjust the pH to 4-6 with glacial acetic acid, stir at room temperature for 30 minutes to obtain a mixed solution.

[0047] Step c) Pour the above mixture containing KH570 into the above solvent containing silica, heat and maintain at 70~80℃ for 6h, finally wash with anhydrous ethanol by centrifugation, and vacuum dry to obtain KH570 modified silica nanoparticles.

[0048] It should also be noted that the 2,6-diphenylphenoxyethyl acrylate in this invention can be obtained by the following synthetic method:

[0049] Step 1: Dissolve 2,6-diphenylphenol and 2-bromoethanol in N,N dimethylformamide at a molar ratio of 1:1. After adding potassium carbonate, stir the mixture at 85-95°C until fully reacted. Separate and purify to obtain 2-(2,6-diphenylphenoxy)ethanol. The structural formula of 2-(2,6-diphenylphenoxy)ethanol is:

[0050]

[0051] Step 2: Dissolve 2-(2,6-diphenylphenoxy)ethanol and triethylamine in dichloromethane at a molar ratio of 1:3, stir and mix in an ice bath, then add acryloyl chloride and react completely. Separate and purify to obtain 2,6-diphenylphenoxyethyl acrylate. The structural formula of 2,6-diphenylphenoxyethyl acrylate is:

[0052]

[0053] The impact-resistant nanocomposite ionogel material prepared by this invention is soft and has a low modulus under normal conditions; however, when subjected to high-speed impact, it undergoes rapid and efficient energy dissipation, resulting in a sharp increase in modulus, achieving an intelligent protective effect of "being strong when encountering hard objects and flexible when encountering soft objects." The performance of the above-mentioned impact-resistant nanocomposite gel material is demonstrated below through several specific embodiments.

[0054] The KH570 modified silica nanoparticles used in the following examples are commercially available materials, purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., item number 100363, serial number: XFI04. The particle size of the KH570 modified silica nanoparticles is 20 nm, and the purity is 99 wt%. Of course, the commercially available KH570 modified silica nanoparticles can also be equivalently replaced by the finished products obtained by modification in steps a) to c) above.

[0055] The 2,6-diphenylphenoxyethyl acrylate used in the following examples was synthesized by the following method:

[0056] First, 12.0 mmol (2.96 g) of 2,6-diphenylphenol and 10 mmol (1.25 g) of 2-bromoethanol were dissolved in DMF (NN dimethylformamide) solution, and then 14.4 mmol (1.99 g) of potassium carbonate was added. The mixture was stirred at 90 °C for 24 hours. After removing the DMF by rotary evaporation, the product was extracted with water to obtain 2-(2,6-diphenylphenoxy)ethanol. The synthetic reaction formula for this step and the 1H NMR spectrum of the product 2-(2,6-diphenylphenoxy)ethanol are shown below. 1 H NMR) such as Figure 2 As shown.

[0057] Then, 38.06 mmol of 2-(2,6-diphenylphenoxy)ethanol and 114.18 mmol of triethylamine were dissolved in 90 mL of dichloromethane and stirred in an ice bath for 20 min. Subsequently, 57.09 mmol of acryloyl chloride was added, and the reaction was carried out at room temperature for 24 h. After extraction with water, the mixture was filtered, centrifuged, and finally dried under vacuum for 12 h to obtain the 2,6-diphenylphenoxyethyl acrylate monomer. The synthetic reaction formula for this step and the 1H NMR spectrum of the product 2,6-diphenylphenoxyethyl acrylate are shown below. 1 H NMR) such as Figure 3 As shown.

[0058] Apart from the KH570 modified silica nanoparticles and 2,6-diphenylphenoxyethyl acrylate mentioned above, all other materials and reagents used in the following examples may be commercially available finished products, and there are no restrictions on their use.

[0059] Example 1

[0060] In this embodiment, a nanocomposite gel material with excellent impact resistance was prepared, specifically including the following steps:

[0061] (1) Preparation of hydrophobic eutectic solvent: Weigh 3.0044g of 5-methyl-2-isopropylphenol and 3.2827g of tetrabutylammonium tetrafluoroborate (molar ratio 2:1), mix them together and place them in an oil bath at 80℃ and heat and stir for 1~2h until the solution is transparent to obtain the hydrophobic eutectic solvent for later use.

[0062] (2) Preparation of presol: Weigh 0.37g of isobornyl acrylate (IBA), 0.28g of hexafluorobutyl acrylate (HFBA), 0.045g of KH570 modified silica nanoparticles (particle size 20nm) and 0.0344g of 2,6-diphenylphenoxyethyl acrylate and mix them together to obtain a presol.

[0063] (3) Preparation of precursor solution: Mix all the presol and 0.2g of hydrophobic eutectic solvent together, add 50uL of photoinitiator 1173 and 50uL of crosslinking agent EDGMA, and sonicate for 20 minutes to obtain precursor solution.

[0064] (4) Preparation of nanocomposite ion gel material: Pour the precursor solution into a mold and place it in an ultraviolet curing box and irradiate it with 365nm ultraviolet light for 3h to obtain the gel product, namely the aforementioned nanocomposite ion gel material with impact resistance.

[0065] Example 2

[0066] Compared to Example 1, this example uses different monomer ratios to prepare nanocomposite gel materials with excellent impact resistance, specifically including the following steps:

[0067] (1) Preparation of hydrophobic eutectic solvent: Weigh 3.0044g of 5-methyl-2-isopropylphenol and 3.2827g of tetrabutylammonium tetrafluoroborate (molar ratio 2:1), mix them together and place them in an oil bath at 80℃ and heat and stir for 1~2h until the solution is transparent to obtain the hydrophobic eutectic solvent for later use.

[0068] (2) Preparation of presol: Weigh 0.25g of isobornyl acrylate (IBA), 0.442g of hexafluorobutyl acrylate (HFBA), 0.045g of KH570 modified silica nanoparticles (particle size 20nm) and 0.0344g of 2,6-diphenylphenoxyethyl acrylate and mix them together to obtain a presol.

[0069] (3) Preparation of precursor solution: Mix all the presol and 0.2g of hydrophobic eutectic solvent together, add 50uL of photoinitiator 1173 and 50uL of crosslinking agent EDGMA, and sonicate for 20 minutes to obtain precursor solution.

[0070] (4) Preparation of nanocomposite ion gel material: Pour the precursor solution into a mold and place it in an ultraviolet curing box and irradiate it with 365nm ultraviolet light for 3h to obtain the gel product, namely the aforementioned nanocomposite ion gel material with impact resistance.

[0071] Example 3

[0072] Compared to Example 1, this example prepares a nanocomposite gel material with excellent impact resistance by changing the content of nanoparticles, specifically including the following steps:

[0073] (1) Preparation of hydrophobic eutectic solvent: Weigh 3.0044g of 5-methyl-2-isopropylphenol and 3.2827g of tetrabutylammonium tetrafluoroborate (molar ratio 2:1), mix them together, and place them in an oil bath for heating and stirring for 1~2h until the solution becomes transparent to obtain the hydrophobic eutectic solvent for later use.

[0074] (2) Preparation of presol: Weigh 0.37g of isoborneol acrylate (IBA), 0.28g of hexafluorobutyl acrylate (HFBA), 0.060g of KH570 modified silica nanoparticles (particle size 20nm) and 0.0344g of 2,6-diphenylphenoxyethyl acrylate and mix them together to obtain a presol.

[0075] (3) Preparation of precursor solution: Mix all the presol and 0.2g of hydrophobic eutectic solvent together, add 50uL of photoinitiator 1173 and 50uL of crosslinking agent EDGMA, and sonicate for 20 minutes to obtain precursor solution.

[0076] (4) Preparation of nanocomposite ion gel material: Pour the precursor solution into a mold and place it in an ultraviolet curing box and irradiate it with 365nm ultraviolet light for 3h to obtain the gel product, namely the aforementioned nanocomposite ion gel material with impact resistance.

[0077] Example 4

[0078] This embodiment prepares a nanocomposite gel material with excellent impact resistance by changing the content of nanoparticles, specifically including the following steps:

[0079] (1) Preparation of hydrophobic eutectic solvent: Weigh 3.0044g of 5-methyl-2-isopropylphenol and 3.2827g of tetrabutylammonium tetrafluoroborate (molar ratio 2:1), mix them together and place them in an oil bath at 80℃ and heat and stir for 1~2h until the solution is transparent to obtain the hydrophobic eutectic solvent for later use.

[0080] (2) Preparation of presol: Weigh 0.25g of isobornyl acrylate (IBA), 0.442g of hexafluorobutyl acrylate (HFBA), 0.045g of KH570 modified silica nanoparticles (particle size 20nm) and 0.0344g of 2,6-diphenylphenoxyethyl acrylate and mix them together to obtain a presol.

[0081] (3) Preparation of precursor solution: Mix all the presol and 0.2g of hydrophobic eutectic solvent together, add 50uL of photoinitiator 1173 and 50uL of crosslinking agent EDGMA, and sonicate for 20 minutes to obtain precursor solution.

[0082] (4) Preparation of nanocomposite ion gel material: Pour the precursor solution into a mold and place it in an ultraviolet curing box and irradiate it with 365nm ultraviolet light for 3h to obtain the gel product, namely the aforementioned nanocomposite ion gel material with impact resistance.

[0083] Example 5

[0084] Compared to Example 3, this example omits the addition of KH570 modified silica nanoparticles and prepares another nanocomposite ionogel material, specifically including the following steps:

[0085] (1) Preparation of hydrophobic eutectic solvent: Weigh 3.0044g of 5-methyl-2-isopropylphenol and 3.2827g of tetrabutylammonium tetrafluoroborate (molar ratio 2:1), mix them together and place them in an oil bath at 80℃ and heat and stir for 1~2h until the solution is transparent to obtain the hydrophobic eutectic solvent for later use.

[0086] (2) Preparation of presol: Weigh 0.37g of isobornyl acrylate (IBA), 0.28g of hexafluorobutyl acrylate (HFBA) and 0.0344g of 2,6-diphenylphenoxyethyl acrylate and mix them together to obtain a presol.

[0087] (3) Preparation of precursor solution: Mix all the presol and 0.2g of hydrophobic eutectic solvent together, add 50uL of photoinitiator 1173 and 50uL of crosslinking agent EDGMA, and sonicate for 20 minutes to obtain precursor solution.

[0088] (4) Preparation of nanocomposite ion gel material: Pour the precursor solution into a mold and place it in an ultraviolet curing box and irradiate it with 365nm ultraviolet light for 3h to obtain the gel product, namely the aforementioned nanocomposite ion gel material with impact resistance.

[0089] To demonstrate the specific properties of the nanocomposite ionogel materials obtained in the above embodiments, the nanocomposite ionogel materials obtained in Examples 1-5 were cut into cylindrical shapes and subjected to compression tests using an Instron 5965 universal testing machine at a controlled rate of 10 mm / min. The compressive stress-strain curves of the nanocomposite gel materials obtained in Examples 1-5 under different monomer ratios and different nanoparticle contents are shown below. Figure 4 As shown, Examples 1 and 2, by significantly altering the monomer ratios, still exhibit high compressive modulus in the nanocomposite gel materials. Furthermore, by controlling the nanoparticle content under these monomer ratio conditions, the nanocomposite gel materials maintain excellent compressive modulus, laying a solid foundation for the subsequent impact resistance of the materials. Comparing the results of Examples 3 and 5, it is evident that the gel material prepared with the addition of KH570 modified silica nanoparticles shows a significantly improved compressive modulus compared to the gel material prepared without nanoparticles. Integrating nanomaterials into the gel can enhance energy dissipation.

[0090] The above embodiments can all prepare nanocomposite ionogel materials with good compressibility. Therefore, to demonstrate other properties of the material, more detailed performance tests were conducted using the nanocomposite ionogel material prepared in Example 1 as a typical example. The specific test process is as follows:

[0091] 1. Compression performance test

[0092] (1) Three nanocomposite ionogel materials prepared in Example 1 with a diameter of 8 mm and a height of 10 mm were selected. Their compressive modulus was measured using an Instron 5965 universal testing machine at compression rates of 0.05 mm / min, 1 mm / min, and 10 mm / min, respectively. The stress-strain diagrams are shown below. Figure 5 As shown in the figure. The dissipated energy and energy dissipation rate were calculated using this stress-strain diagram, and the results are as follows. Figure 6 As shown in the figure. The results show that the compressive moduli of the prepared nanocomposite ionogel material at compression rates of 0.05 mm / min, 1 mm / min, and 10 mm / min are 0.8 MPa, 29.5 MPa, and 84.6 MPa, respectively, indicating that the material has a significant dependence on strain rate. Under low-rate compression conditions, the gel exhibits softness similar to soft tissue, while under high-rate compression conditions, it exhibits the compressive strength of engineering plastics. Furthermore, from... Figure 5 As can be seen from the data, energy dissipation is significantly enhanced with the increase of compression rate, and the energy dissipation rate is always greater than 75%, indicating that the material has good energy dissipation performance.

[0093] 2. Rheological testing

[0094] A piece of the nanocomposite ionogel material prepared in Example 1, with a diameter of 200 mm and a height of 1 mm, was selected. Frequency scanning was performed using an HR-20 rheometer at 20 °C. The results are as follows: Figure 7 As shown in the figure. The results show that the prepared nanocomposite gel material has G'(100Hz) / G'(0.01Hz)=400, which reflects that the gel material has good impact hardening properties and is combined with Figure 4 Its excellent modulus properties in the hardened state fully demonstrate its significant potential in the field of intelligent protection.

[0095] 3. Hopkinson bar impact test

[0096] Five pieces of the nanocomposite ionogel material prepared in Example 1, each with a diameter of 100 mm and a height of 1 mm, were subjected to loading rates of 500 s using a Hopkinson bar. -1 1000s -1 2000s -1 4000s -1 5000s -1 The results of the high-speed impact test are as follows: Figure 8 As shown. The results show that at 500s -1 1000s -1 2000s -1 4000s -1 5000s -1Under high-speed impact with varying loading rates, the impact moduli of the gels were 28.71 MPa, 32.7 MPa, 43.6 MPa, 107.2 MPa, and 223.5 MPa, respectively. Compared with existing gel materials, such as... Figure 9 As shown, the nanocomposite ionogel material of the present invention exhibits excellent impact resistance under high-speed impact.

[0097] The embodiments described above are merely some preferred implementations of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A method for preparing a nanocomposite ionogel material with impact-resistant properties, characterized in that, include: S1. Mix 5-methyl-2-isopropylphenol and tetrabutylammonium tetrafluoroborate at a molar ratio of (3~1):1, and then heat the mixture at 80~90℃ for 1~2 hours until a transparent hydrophobic eutectic solvent is obtained. S2. Isoborneol acrylate, hexafluorobutyl acrylate, KH570 modified silica nanoparticles and 2,6-diphenylphenoxyethyl acrylate are mixed evenly in a mass ratio of (5.5~6.5):(8.2~9.2):(0.5~1.5):(0.5~1.5) to obtain a pre-solution; S3. Mix the pre-solution and hydrophobic eutectic solvent at a mass ratio of (0.8~1.1):(0.15~0.25), add the photoinitiator and crosslinking agent, and then mix and disperse by ultrasonic stirring to obtain the precursor solution; S4. Pour the precursor solution into a mold, seal it, and then cure it under ultraviolet light to obtain a nanocomposite ionogel material.

2. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 1, characterized in that, The molar ratio of 5-methyl-2-isopropylphenol to tetrabutylammonium tetrafluoroborate is 2:

1.

3. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 1, characterized in that, The synthesis method of the 2,6-diphenylphenoxyethyl acrylate is as follows: 2,6-diphenylphenol and 2-bromoethanol are dissolved in N,N dimethylformamide, potassium carbonate is added, and the mixture is stirred at 85-95°C until fully reacted. The mixture is then separated and purified to obtain 2-(2,6-diphenylphenoxy)ethanol. 2-(2,6-diphenylphenoxy)ethanol and triethylamine are then dissolved in dichloromethane, stirred in an ice bath until well mixed, and acryloyl chloride is added until fully reacted. The mixture is then separated and purified to obtain 2,6-diphenylphenoxyethyl acrylate.

4. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 3, characterized in that, The molar ratio of 2,6-diphenylphenol to 2-bromoethanol is 1:1, and the molar ratio of 2-(2,6-diphenylphenoxy)ethanol to triethylamine is 1:

3.

5. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 1, characterized in that, The photoinitiator used is photoinitiator 1173.

6. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 5, characterized in that, The crosslinking agent is ethylene glycol dimethacrylate.

7. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 1, characterized in that, The added photoinitiator and crosslinking agent are added at masses of 0.05% to 0.1% of the total mass of the precursor solution.

8. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 1, characterized in that, The duration of ultrasonic stirring is 20-40 minutes.

9. The method for preparing the impact-resistant nanocomposite ionogel material according to claim 1, characterized in that, The ultraviolet light used for curing is 365nm wavelength, and the ultraviolet light irradiation time is 2.5~3h.

10. A nanocomposite ionogel material with impact resistance prepared according to the preparation method of any one of claims 1 to 9.

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