Aramid composite laminates, methods of making and using the same

Abstract

The application discloses an aramid composite laminated plate and a preparation method and application thereof. Aramid III fabric is used as a matrix, the aramid III fabric is completely soaked in a shear thickening fluid (STF), a layer of polyurethane resin (PU) is uniformly applied after drying, and a hot pressing lamination technology is used to stably combine the matrix and the STF, so that the aramid composite laminated plate is obtained. The application provides a method for stably combining STF and a protective material to prepare the aramid composite laminated plate, and proposes a hybrid preparation scheme for different STF impregnated aramid fabrics. Compared with a traditional bulletproof material, the aramid composite laminated plate has a significantly improved bulletproof performance, and a new idea is provided for application of the STF on bulletproof equipment, and problems such as instability of the STF in the fabric are solved. The application also provides a new application method for improving a ballistic performance of a bulletproof plate by using the STF.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology, and more specifically, to an aramid composite laminate, its preparation method, and its application. Background Technology

[0002] The materials used in soft bulletproof vests are primarily made of high-performance textile fibers, such as aramid (…). etc.) and ultra-high molecular weight polyethylene (etc.) While ballistic fabrics made of high-performance fibers possess excellent ballistic resistance, the insufficient friction between the yarns in pure fabrics often allows bullets to pass through the yarns, creating a window effect where the yarns are pulled out after penetration, thus preventing the high-performance fibers from fully realizing their ballistic resistance potential. The addition of shear thickening fluid (STF) can increase the fabric's friction, providing additional energy absorption capacity for protective equipment subjected to high-speed impacts. However, the inherent instability of STF limits its application; therefore, how to stably integrate STF with protective materials in protective equipment is a critical issue that urgently needs to be addressed. Summary of the Invention

[0003] This invention addresses the aforementioned problems in the prior art. Therefore, there is a need for an aramid composite laminate, its preparation method, and its applications. Compared to traditional bulletproof materials, this aramid composite laminate exhibits significantly improved ballistic performance and offers a new approach to the application of STF in bulletproof equipment, solving problems such as the instability of STF within fabrics. This also provides a new application method for using STF to improve the ballistic performance of bulletproof plates.

[0004] According to a first aspect of the present invention, an aramid composite laminate is provided, the aramid composite laminate comprising at least two plates stacked sequentially, each plate comprising a matrix, a shear thickening liquid layer and a polyurethane resin layer, the matrix being an aramid III fabric, the outer side of the matrix being completely covered by the shear thickening liquid layer, and the polyurethane resin layer being disposed on the outer side of the shear thickening liquid layer.

[0005] Preferably, the aramid III fabric is STARAMID F-3 / aramid III with an areal density of 200 g / m³. 2 The thickness is 0.31mm, and the warp and weft density is 10 threads / 10mm.

[0006] It should be noted that the STARAMID F-3 / aramid III fiber, model F-3P200, provided by Zhonglan Chenguang Chemical Co., Ltd., is a plain weave fabric with an areal density of 200 g / m², a thickness of 0.31 mm, and a warp and weft density of 10 threads / 10 mm. STARAMID F-3 fiber is a novel para-aramid heterocyclic copolyamide fiber produced by introducing heterocyclic structures into the main chain of poly(p-phenylene terephthalamide) (PPTA). Thanks to its superior molecular structure design compared to aramid II fiber (fully para-aramid, aramid 1414), its mechanical properties are improved by approximately 30%. The introduction of the heterocyclic structure also improves the fiber's interfacial properties, making it more conducive to composite bonding. STARAMID F-3 fiber possesses properties such as lightweight, high strength, high modulus, high temperature resistance, flame retardancy, and impact resistance.

[0007] Preferably, the substrate is a square with a side length of 200mm.

[0008] Preferably, the shear-thickening liquid layer comprises silica particles with particle sizes of 20 nm and 500 nm, anhydrous ethanol, and polyethylene glycol with a molecular weight of 200.

[0009] According to a second aspect of the present invention, a method for preparing the aramid composite laminate as described above is provided, the method comprising:

[0010] Using aramid III fabric as the matrix, the aramid III fabric is completely immersed in a shear thickening liquid, dried, and then uniformly coated with a layer of polyurethane resin. The matrix and the shear thickening liquid are then combined by hot pressing to obtain the aramid composite laminate.

[0011] It should be noted that the composite laminate obtained by this invention first involves impregnating aramid with STF, then uniformly coating the soaked and dried fabric layer with a layer of polyurethane resin glue (PU), and finally using hot-pressing technology to stably bond the STF and aramid together. Compared with the prior art, the aramid composite laminate obtained by this invention uses polyurethane resin and hot-pressing technology. The presence of polyurethane resin ensures that the fabric layers are tightly bonded together, while the hot-pressing technology ensures that the STF is tightly filled between the yarns. After STF treatment, more of the impact energy received by the main yarn of the fabric is transferred to the secondary yarns, and more yarns participate in energy absorption, resulting in a significant improvement in the ballistic performance of the STF-impregnated fabric panel. The failure modes of pure fabric panels are yarn pull-out and yarn breakage. Some fabric fibers do not fully exert their anti-penetration ability, and projectiles can easily pass through the yarns. The failure mode of fabric panels impregnated with STF is mainly yarn breakage. This is because the addition of STF increases the friction between fabric fibers, making it less likely for the yarns to slip. During the penetration process, the yarns are better coupled and the impact load is transmitted, which increases the resistance encountered by the projectile. The projectile can only penetrate the fabric panel by breaking the fibers it encounters, effectively reducing the deformation energy of the bullet.

[0012] Preferably, the shear-thickening fluid is prepared by the following method:

[0013] A mixed solution was obtained by mixing silica nanoparticles with anhydrous ethanol.

[0014] Add an appropriate amount of polyethylene glycol to the mixed solution and then perform ultrasonic treatment.

[0015] Heating removes anhydrous ethanol, yielding a shear-thickened liquid.

[0016] Preferably, the shear-thickening fluid is prepared by the following method:

[0017] Appropriate amounts of silica particles with particle sizes of 20 nm and 500 nm were mixed with 100 ml of ethanol and stirred to obtain a mixed solution.

[0018] Add an appropriate amount of polyethylene glycol to the mixed solution and stir;

[0019] The mixture after adding polyethylene glycol and stirring was subjected to ultrasonic treatment;

[0020] Ethanol was removed by constant-temperature heating, yielding two types of STFs: STF-20 and STF-500. STF-20 contained 40 wt% silica particles and had a density of 1.42 g / cm³. 3 The silica particle content of STF-500 is 40wt%, and the density is 1.85g / cm³. 3 .

[0021] Preferably, after obtaining two STFs, the method further includes:

[0022] The STF-20 and STF-500 were diluted with anhydrous ethanol at a volume ratio of 1:4 to obtain STF-20 diluent and STF-500 diluent, respectively.

[0023] Preferably, aramid III fabric is used as the matrix. The aramid III fabric is completely immersed in a shear thickening liquid, dried, and then uniformly coated with a layer of polyurethane resin. The matrix and the shear thickening liquid are then laminated by hot pressing to obtain the aramid composite laminate, comprising:

[0024] The substrate is divided into fabrics of uniform size, and then grouped, numbered, and weighed.

[0025] The grouped fabrics were soaked in STF-20 dilution and STF-500 dilution respectively, rolled with rollers to remove excess STF, and dried at constant temperature to remove ethanol.

[0026] A layer of polyurethane resin is evenly applied to the fabric after ethanol removal. After drying at a constant temperature, the fabric is stacked in a grouped order, tightly wrapped with polyester film, and placed in a press with the position centered on all four sides. The mold is closed and heated to 160°C, and maintained at 5MPa, 12MPa, and 18MPa for a first set time, respectively. The pressure is increased to 24MPa and maintained for a second set time, then cooled to 30°C. The pressure is released and the board is removed to obtain the aramid composite laminate.

[0027] According to a third aspect of the present invention, a shear thickening fluid is provided for improving the ballistic performance of bulletproof plates, the shear thickening fluid comprising silica particles with particle sizes of 20 nm and 500 nm, anhydrous ethanol, and polyethylene glycol with a molecular weight of 200.

[0028] The present invention has at least the following beneficial effects:

[0029] This invention provides a method for preparing aramid composite laminates by stably combining STF with protective materials, and proposes a hybrid preparation scheme for aramid fabrics impregnated with different STFs. Compared with traditional bulletproof materials, the aramid composite laminate exhibits significantly improved ballistic performance and offers a new approach to the application of STF in bulletproof equipment, solving problems such as the instability of STF in fabrics. This also provides a new application method for using STF to improve the ballistic performance of bulletproof plates. Attached Figure Description

[0030] Figure 1 A structural diagram of an aramid composite laminate according to an embodiment of the present invention is shown.

[0031] Figure 2An electron microscope image of an aramid composite laminate according to an embodiment of the present invention is shown.

[0032] Figure 3 A flowchart illustrating the preparation process of an aramid composite laminate according to an embodiment of the present invention is shown.

[0033] Figure 4 A schematic diagram of the number of perforated layers according to an embodiment of the present invention is shown. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific examples, but this is not intended to limit the present invention. If there is no necessary sequential relationship between the various steps described herein, the order in which they are described as examples should not be considered a limitation. Those skilled in the art should understand that the order can be adjusted, as long as it does not disrupt the logical consistency between them and render the entire process impossible.

[0035] This invention provides an aramid composite laminate, such as... Figure 1 As shown, the aramid composite laminate includes at least two plates 100 stacked sequentially. Each plate 100 includes a substrate 101, a shear thickening liquid layer 102, and a polyurethane resin layer 103. The substrate 101 is made of aramid III fabric. The outer side of the substrate 101 is completely covered by the shear thickening liquid layer 102, and the polyurethane resin layer 103 is disposed on the outer side of the shear thickening liquid layer 102.

[0036] In a preferred embodiment, the aramid III fabric is STARAMID F-3 / aramid III with an areal density of 200 g / m³. 2 The thickness is 0.31mm, and the warp and weft density is 10 threads / 10mm.

[0037] In a preferred embodiment, the substrate is a square with a side length of 200 mm.

[0038] In a preferred embodiment, the shear-thickening liquid layer comprises silica particles with particle sizes of 20 nm and 500 nm, anhydrous ethanol, and polyethylene glycol with a molecular weight of 200.

[0039] In this embodiment, to observe the distribution of STF in the fabric, a SU3500 scanning electron microscope (SEM) was used to image and compare composite laminate fabrics with and without STF treatment. Due to the poor conductivity of aramid fibers, a magnetron ion sputtering metal coating device was used to sputter the fabric surface with gold before electron scanning. It can be seen that STF-500 has a wider shear thickening range than STF-20. This may be because, at the same mass fraction, STF-20 has a greater number of particles, making it easier for these particles to aggregate and form hydrogen clusters. Therefore, STF-20 reaches its peak viscosity more rapidly after reaching the critical shear rate. Figure 2 As shown.

[0040] This invention also provides a method for preparing an aramid composite laminate. This method uses aramid III fabric as the substrate and employs hot-pressing lamination technology to combine it with STF. Four different composite laminate preparation schemes are proposed, and the preparation process is as follows: Figure 3 As shown.

[0041] Table 1 records information on four different aramid composite laminates. For all composite laminates, "P" indicates aramid III fabric; the number after "P" indicates the number of fabric layers; "N" and "S" indicate whether the fabric layers are impregnated with STF, respectively; the number after "S" indicates the silica particle size.

[0042] Table 1 Parameters of Composite Laminates

[0043]

[0044] The following embodiments of the present invention will specifically illustrate the preparation process of the aramid composite laminate with the following four examples, and further illustrate the feasibility and progress of the present invention by conducting a ballistic impact test on the aramid composite laminate prepared in the previous four examples through an example.

[0045] It should be noted that the fumed silica particles used in the shear thickening liquids in the following four examples (Examples 1 to 4) had particle sizes of 20 nm and 500 nm, respectively, and were purchased from Shanghai MCC New Materials Co., Ltd. (China). The polyethylene glycol (PEG 200) with a molecular weight of 200 was purchased from Wuxi Yatai United Chemical Co., Ltd. (China), and the anhydrous ethanol (analytical grade) was purchased from Jiangsu Biaohui Chemical Co., Ltd. (China).

[0046] Example 1:

[0047] P20S(20) aramid composite laminate was prepared by the following steps:

[0048] Step 1: Prepare a shear thickening fluid with a density of 1.42 g / cm3 (STF-20).

[0049] First, a certain amount of 20nm silica particles were mixed with 100ml of ethanol and stirred for 0.5h using a power stirrer. Then, a certain amount of polyethylene glycol with a molecular weight of 200 was added to the solution, and stirring was continued for 2h. Next, the solution was ultrasonically treated for 0.5h using an ultrasonic cleaner. Finally, it was heated in a 90℃ constant temperature drying oven for 2h to remove the ethanol, yielding STF-20 with a silica particle content of 40wt%.

[0050] Step 2: The shear thickening liquid is compounded with the aramid fabric.

[0051] The aramid III fabric was divided into 200mm×200mm sections, and then grouped, numbered, and weighed. The weight of the nth group of pure fabric was denoted as ng, and n was a maximum of 20.

[0052] To ensure that the STF completely permeates the fabric, the prepared STF is diluted with anhydrous ethanol at a volume ratio of 1:4 to obtain a diluted solution.

[0053] The grouped fabrics were soaked in the diluted solution for 0.5 h, then rolled with a 2 kg roller to remove excess STF, and finally the treated fabrics were convectively dried in a 79 °C constant temperature drying oven for 1 h to remove ethanol.

[0054] Step 3, hot pressing process to stabilize the composite

[0055] First, a layer of polyurethane resin glue (PU) is evenly coated onto the soaked and dried fabric layer, and then it is convectively dried in an 80℃ forced-air drying oven for 0.5h. Then, the fabric is stacked, tightly wrapped with polyester film, and placed in the press with the position centered on all four sides. The mold is closed and heated to 160℃ for 1h, and then held at 5MPa, 12MPa, and 18MPa pressures for 10 minutes respectively. Finally, the pressure is increased to 24MPa and held for 40 minutes, and then cooled to 30℃ to release the pressure and remove the board, thus obtaining the P20S(20) aramid composite laminate.

[0056] Example 2:

[0057] P20S(500) aramid composite laminate was prepared by the following steps:

[0058] Step 1: Prepare a shear thickening fluid with a density of 1.85 g / cm3 (STF-500).

[0059] First, a certain amount of 500nm silica particles were mixed with 100ml of ethanol and stirred for 0.5h using a power stirrer. Then, a certain amount of polyethylene glycol with a molecular weight of 200 was added to the solution, and stirring was continued for 2h. Next, the solution was ultrasonically treated for 0.5h using an ultrasonic cleaner. Finally, it was heated in a 90℃ constant temperature drying oven for 2h to remove the ethanol, yielding STF-500 with a silica particle content of 40wt%.

[0060] Step 2: The shear thickening liquid is compounded with the aramid fabric.

[0061] The aramid III fabric was divided into 200mm×200mm sections, and then grouped, numbered, and weighed. The weight of the nth group of pure fabric was denoted as ng, and n was a maximum of 20.

[0062] To ensure that the STF completely permeates the fabric, the STF prepared above is diluted with anhydrous ethanol at a volume ratio of 1:4 to obtain a diluted solution.

[0063] The grouped fabrics were soaked in the diluted solution for 0.5 h, then rolled with a 2 kg roller to remove excess STF, and finally the treated fabrics were convectively dried in a 79 °C constant temperature drying oven for 1 h to remove ethanol.

[0064] Step 3: Stable composite bonding through hot pressing molding process.

[0065] First, the soaked and dried fabric is evenly coated with a layer of polyurethane resin glue (PU) and dried in an 80℃ forced-air drying oven for 0.5h. Then, the fabric is stacked, tightly wrapped with polyester film, and placed in the press with the position centered on all four sides. The mold is closed and heated to 160℃ for 1h. It is then held at 5MPa, 12MPa, and 18MPa pressures for 10 minutes each. Finally, the pressure is increased to 24MPa and held for 40 minutes before cooling down to 30℃ to release the pressure and remove the board, thus obtaining the P20S(500) aramid composite laminate.

[0066] Example 3:

[0067] P10S(20) + P10S(500) aramid composite laminate was prepared by the following steps:

[0068] Step 1: Shear thickening liquid is compounded with aramid fabric.

[0069] The two shear thickening liquids, STF-20 and STF-500, prepared in Examples 2 and 3 above, were diluted with anhydrous ethanol at a volume ratio of 1:4 to obtain STF-20 diluent and STF-500 diluent.

[0070] Fabrics in groups 1-10 were soaked in STF-20 dilution for 0.5 hours, and fabrics in groups 11-20 were soaked in STF-500 dilution for 0.5 hours. Then, they were rolled with a 2 kg roller to remove excess STF. Finally, the treated fabrics were convectively dried in a 79℃ constant temperature drying oven for 1 hour to remove ethanol.

[0071] Step 2: Stable composite bonding via hot pressing molding process.

[0072] First, the soaked and dried fabric is evenly coated with a layer of polyurethane resin glue (PU) and dried in an 80℃ forced-air drying oven for 0.5h. Then, the fabric is stacked in the order of group number, tightly wrapped with polyester film and placed in the press with the position centered on all four sides. The mold is closed and heated to 160℃ for 1h. It is then held at 5MPa, 12MPa and 18MPa for 10 minutes respectively. Finally, the pressure is increased to 24MPa and held for 40 minutes. After cooling to 30℃, the pressure is released and the board is removed to obtain P10S(20)+P10S(500) aramid composite laminate.

[0073] Example 4:

[0074] P10S(500) + P10S(20) aramid composite laminate was prepared by the following steps:

[0075] Step 1: Shear thickening liquid is compounded with aramid fabric.

[0076] The aramid fabric was completely soaked using the STF-20 diluent and STF-500 diluent prepared in Example 3 above.

[0077] First, the fabrics in groups 1-10 were soaked in STF-500 diluted solution for 0.5 hours, and the fabrics in groups 11-20 were soaked in STF-20 diluted solution for 0.5 hours. Then, they were rolled with a 2kg roller to remove excess STF. Finally, the treated fabrics were convectively dried in a 79℃ constant temperature drying oven for 1 hour to remove ethanol.

[0078] Step 2: Stable composite bonding via hot pressing molding process.

[0079] First, the soaked and dried fabric is evenly coated with a layer of polyurethane resin glue (PU) and dried in an 80℃ forced-air drying oven for 0.5h. Then, the fabric is stacked in the order of group number, tightly wrapped with polyester film and placed in the press with the position centered on all four sides. The mold is closed and heated to 160℃ for 1h. It is then held at 5MPa, 12MPa and 18MPa pressure for 10 minutes respectively. Finally, the pressure is increased to 24MPa and held for 40 minutes. After cooling to 30℃, the pressure is released and the board is removed to obtain P10S(500)+P10S(20) aramid composite laminate.

[0080] Example 5: Ballistic Impact Test

[0081] Four types of aramid composite laminates and a set of pure aramid fabric panels prepared in the above four embodiments were used as bulletproof plates, and ballistic impact tests were conducted using a two-stage light gas gun.

[0082] In this experiment, small steel balls with a diameter of 9mm and a mass of 3.05g were used to test bulletproof plates with different structures. The impact velocity was 345±15m / s, and the bullet velocity was measured by a magnetic induction device. The process of the bullet hitting the laminated plate was recorded by a high-speed camera. The target plate consisted of a bulletproof plate and a clay backing material. The plate was placed horizontally on the clay backing material and fixed in position with bandages.

[0083] After each ballistic impact test, the maximum indentation depth on the backing material is measured using a digital depth calibrator; this is known as the BFS (Bottom Surface Footprint). Before and after every two ballistic impact tests, the clay hardness should be calibrated using drop tests according to NIJ 0101.06. A 1040g steel ball with a diameter of 63.5mm is dropped freely from a height of 2m onto the backing material, and the indentation depth is measured. Five drops are performed for each calibration, and the arithmetic mean of the measurements is calculated. The average indentation depth should be within 19mm ± 2mm.

[0084] The ballistic impact test data are shown in the table below:

[0085] Table 2 Ballistic Impact Data

[0086]

[0087]

[0088] The experiment showed that 25 layers of pure fabric panels failed to prevent bullet penetration, with an average bullet penetration depth of 54.47 mm into the backing material. In contrast, all 20 layers of fabric panels impregnated with STF were able to stop bullet impact, with measured BFS (16mm-22mm) all below 44mm, meeting the standards of the National Institute of Justice (NIJ 0101.06) for bulletproof panels' protection of the human body. Furthermore, P10S(20)+P10S(500) and P10S(500)+P10S(20) contributed the best and second best to BFS, respectively.

[0089] Analysis of the above data reveals that when different ratios of STF are applied individually to bulletproof fabric, the improvement in ballistic performance of the bulletproof panel is not as good as the improvement when they are combined. Furthermore, the optimal combination is when STF-20 impregnated fabric is used as the incoming surface and STF-500 impregnated fabric is used as the backing material.

[0090] Following ballistic impact tests, the number of perforated layers in the fabric panels was recorded and analyzed. For pure fabric panels, the projectiles completely penetrated and remained embedded in the clay. In contrast, STF-impregnated fabric panels blocked the projectiles in 8-14 layers. This indicates that using a hot-pressing lamination process to process STF-impregnated panels can significantly improve the ballistic performance of fabric panels. Figure 4 (a) and (b) show the average number of perforated layers and the perforation quality ratio of panels with different configurations of STF-impregnated fabrics (pure fabric panels are completely ineffective and have no comparative value). It can be seen that the perforation quality ratio and the number of perforated layers of 20 different configuration panels have a consistent trend. After different STF-impregnated fabrics are combined with each other, the number of perforated layers and the perforation quality ratio of the fabric panels are further reduced. The perforation quality ratios of the panel hybrid configurations P10S(20)+P10S(500) and P10S(500)+P10S(20) are 0.407 and 0.543, respectively, which are reduced by 0.243-0.26 and 0.107-0.124 compared with single STF-impregnated panels. The average number of perforated layers is 8.3 and 10.7, respectively, which are reduced by 4.7-5 layers and 2.3-2.6 layers compared with single STF-impregnated panels. This indicates that the interaction between the increased friction of fabric fibers and the shear thickening effect of STF has a positive impact on the elastic resistance of the fabric panel.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of making an aramid composite laminate, characterized by, The aramid composite laminated board comprises at least two board bodies stacked in sequence, the board body comprises a base body, a shear thickening fluid layer and a polyurethane resin layer, the base body is aramid III fabric, the outer side of the base body is fully wrapped with the shear thickening fluid layer, and the outer side of the shear thickening fluid layer is provided with the polyurethane resin layer; the preparation method comprises the following steps: The aramid III fabric is used as the base body, the aramid III fabric is completely soaked in the shear thickening fluid, and after drying, a layer of polyurethane resin is uniformly applied, and the base body is combined with the shear thickening fluid through hot pressing lamination to obtain the aramid composite laminated board. The shear thickening fluid is prepared by the following method: Respectively, a proper amount of silica particles with particle sizes of 20 nm and 500 nm are mixed with 100 ml of ethanol to obtain a mixed solution, and the mixed solution is stirred; A proper amount of polyethylene glycol is added to the mixed solution and stirred; The mixed solution to which the polyethylene glycol is added and stirred is subjected to ultrasonic treatment; The constant temperature heating removes ethanol to obtain two STFs, STF-20 and STF-500, wherein the silica particle content of STF-20 is 40wt%, and the density is 1.42 g / cm 3 ; the silica particle content of STF-500 is 40wt%, and the density is 1.85 g / cm 3 ; The aramid III fabric is used as the base body, the aramid III fabric is completely soaked in the shear thickening fluid, and after drying, a layer of polyurethane resin is uniformly applied, and the base body is combined with the shear thickening fluid through hot pressing lamination to obtain the aramid composite laminated board, comprising: The base body is divided into fabrics with consistent sizes, and is grouped, numbered and weighed; The grouped fabrics are soaked in STF-20 diluent and STF-500 diluent respectively, and a roller is used to roll to remove excess STF, and constant temperature drying is performed to remove ethanol; The fabrics from which the ethanol is removed are uniformly applied with a layer of polyurethane resin, and after constant temperature drying, the fabrics are stacked in the grouping order; The STF-20 impregnated fabric is used as the front surface, and the STF-500 impregnated fabric is used as the bottom lining material.

2. The method of claim 1, wherein, The aramid III fabric is STARAMID F-3 / aramid III, with an areal density of 200 g / m 2 , a thickness of 0.31 mm, and a warp and weft density of 10 threads / 10 mm.

3. The method of claim 1, wherein, The base body is a square with a side length of 200 mm.

4. The method of claim 1, wherein, The shear thickening fluid layer comprises silica particles with particle sizes of 20 nm and 500 nm, anhydrous ethanol, and polyethylene glycol with a molecular weight of 200.

5. The method of claim 1, wherein, The shear thickening fluid is prepared by the following method: Silica nanoparticles are mixed with anhydrous ethanol to obtain a mixed solution; A proper amount of polyethylene glycol is added to the mixed solution and subjected to ultrasonic treatment; The anhydrous ethanol is removed by heating to obtain the shear thickening fluid.

6. The method of claim 1, wherein, After obtaining the two STFs, the method further comprises: The STF-20 and the STF-500 are respectively configured with anhydrous ethanol at a volume ratio of 1:4 to obtain STF-20 diluent and STF-500 diluent.

7. The method of claim 6, wherein, The aramid III fabric is used as the base body, the aramid III fabric is completely soaked in the shear thickening fluid, and after drying, a layer of polyurethane resin is uniformly applied, and the base body is combined with the shear thickening fluid through hot pressing lamination to obtain the aramid composite laminated board, further comprising: After being tightly wrapped with a polyester film, the aramid composite laminated board is placed in a press, and the position is in the middle of four sides; the mold is heated to 160 DEG C, and is kept at a pressure of 5 MPa, 12 MPa and 18 MPa respectively for a first set time, is raised to 24 MPa and kept for a second set time, is cooled to 30 DEG C, is depressurized, and the board is taken out to obtain the aramid composite laminated board.

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