Preparation method of graphene polyamide composite material for military tent

Abstract

The invention relates to the technical field of polymer composite materials, in particular to a preparation method of a graphene polyamide composite material for military tents, which comprises the following steps: mixing graphene oxide dispersion liquid with carbon nanotubes, directionally assembling under an alternating electric field, and reducing to obtain modified graphene; the preparation method comprises the following steps: mixing polyamide 66 slices with nano boron nitride and a nucleating agent, and carrying out melt blending in a double-screw extruder to obtain a nano reinforced polyamide matrix; the preparation method comprises the following steps: mixing the modified graphene with a matrix in proportion, adding a reactive compatibilizer, reacting at a certain temperature and stirring speed, and carrying out extrusion molding. According to the preparation method, the graphene polyamide composite material for the military tent is excellent in mechanical property, firm and durable; the functions of thermal management, antibiosis, ultraviolet resistance, electromagnetic shielding and the like are achieved; the preparation process is easy to industrialize, the cost is low, the quality is stable, and the requirements of armies on high-performance tent materials can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer composite materials, and in particular to a method for preparing a graphene polyamide composite material for military tents. Background Art

[0002] In modern military operations, military tents serve as crucial equipment for field operations, training, and logistical support. Their performance directly impacts the efficiency of military missions and the quality of life for personnel. Traditional military tents, often made of conventional polymer materials such as polyester and nylon, offer a degree of durability and portability, but struggle to meet diverse military needs in extremely complex battlefield environments. For example, in tropical jungles characterized by high temperatures and high humidity, traditional tents lack insulation, making it difficult for internal heat to dissipate, leading to heatstroke and dehydration in soldiers, severely weakening their combat effectiveness. In the frigid plateaus, their insufficient thermal insulation prevents them from effectively protecting against low temperatures, increasing the risk of frostbite and hypothermia. In windswept deserts, the materials' poor wear and tear resistance leads to damage from frequent use, shortening the tent's lifespan. Furthermore, traditional materials lack electromagnetic shielding capabilities, making them incapable of ensuring the security of military equipment and information in electronic warfare environments.

[0003] With the development of new material technology, graphene and polyamide materials have shown great potential in the field of high-performance composite materials. Polyamide (PA), commonly known as nylon, has high strength, good wear resistance and chemical stability, and is widely used in textiles, machinery and other fields. However, single polyamide materials have limitations in heat resistance, electrical conductivity and thermal conductivity. Graphene is a kind of carbon atom with sp 2 The hybrid orbitals form a two-dimensional carbon nanomaterial with a hexagonal honeycomb lattice. It has excellent mechanical properties (tensile strength up to 130GPa), ultra-high thermal conductivity (about 5300W / m·K) and unique electrical properties. In theory, it can greatly make up for the performance shortcomings of polyamide materials.

[0004] However, the preparation of graphene and polyamide composites for use in military tent materials still faces many technical bottlenecks. On the one hand, the graphene surface is chemically inert and easily agglomerates in the polyamide matrix, making it difficult to achieve uniform dispersion. This results in the composite material's performance not being fully utilized and even local performance weaknesses. On the other hand, there is a lack of effective interfacial bonding between graphene and polyamide, which easily leads to interfacial debonding under external forces, affecting the overall mechanical properties of the composite material. Existing composite methods, such as solution blending, have problems such as solvent residue and complex processes, which are not conducive to large-scale production. Although melt blending is easy to industrialize, it is difficult to control the dispersion and orientation of graphene, and high-temperature processing may destroy the structure of graphene. In addition, for the special needs of military tents, such as the integration of electromagnetic shielding, antibacterial self-repair, and intelligent temperature control, existing technologies still have obvious shortcomings and cannot meet the urgent needs of modern military equipment for high-performance, multifunctional materials. Therefore, there is an urgent need to develop an innovative preparation method to solve the key technical difficulties in the application of graphene-polyamide composites in military tents and improve the comprehensive performance of the materials. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present invention provides a method for preparing a graphene polyamide composite material for military tents.

[0007] (2) Technical solution

[0008] A method for preparing a graphene polyamide composite material for military tents comprises the following steps:

[0009] The steps of constructing a three-dimensional graphene network are as follows: mixing a graphene oxide dispersion with carbon nanotubes, and aligning them under an alternating electric field to form a three-dimensional graphene-carbon nanotube conductive network, followed by reduction with hydrazine hydrate vapor to obtain modified graphene;

[0010] The polyamide matrix nano-reinforcement step comprises: mixing polyamide 66 chips with nano-boron nitride and a nucleating agent, lithium benzoate, and melt blending in a twin-screw extruder at barrel temperatures of 250-260° C., 260-270° C., 270-280° C., and 265-275° C., and a pressure of 0.2-0.4 MPa, to obtain a nano-reinforced polyamide matrix;

[0011] Composite molding steps: adding modified graphene and nano-reinforced polyamide matrix into a reactor at a mass ratio of (5-10):100, adding a reactive compatibilizer, stirring at 255-265°C for 3-5 hours, and then extruding through a mold; the tensile strength σ of the composite material satisfies the formula: σ=σ0+k1×ω×(1+k2×ρ)+k3×ω 2, where σ0 is the tensile strength of the pure polyamide matrix, ω is the mass fraction of modified graphene, ρ is the density of the graphene-carbon nanotube network, k1 = 20 to 25, k2 = 3 to 5, k3 = -8 to -5; the reactive compatibilizer is a styrene-maleic anhydride copolymer, and its structural formula is:

[0012]

[0013] Preferably, it also includes:

[0014] Fiber composite step: In the composite molding step, basalt fiber is added, and the basalt fiber is pre-treated with a silane coupling agent KH-550. The treatment method is to soak the fiber in an ethanol solution of the silane coupling agent having a mass fraction of 2-5% for 1-3 hours, and then dry it at 100-120° C. for 2-4 hours. After adding the fiber, the flexural strength σf of the composite material satisfies the formula: σf=σf0+k4×Vf×(1+k5×θ), where σf0 is the flexural strength of the composite material without the addition of the fiber, Vf is the volume fraction of the fiber, and θ is the interface bonding strength coefficient between the fiber and the matrix, with a value range of 0-1, k4=60 to 80, and k5=2 to 4.

[0015] Thermal performance optimization step: After extrusion molding, the composite material is annealed at a temperature of 180-200°C for 2-4 hours.

[0016] Preferably, it also includes:

[0017] Antibacterial treatment step: soaking the formed composite material in a mixed solution containing 0.1-0.3wt% nano-titanium dioxide and 0.05-0.15wt% nano-silver for 2-4 hours, and then drying at 60-80°C;

[0018] Anti-ultraviolet treatment step: in the composite molding step, adding 0.5-2% of the total mass of the ultraviolet absorber 2-hydroxy-4-methoxybenzophenone and 0.5-2% of the light stabilizer bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate.

[0019] Preferably, the mass fraction of oxygen-containing functional groups in graphene oxide is 15-25%, the outer diameter of the carbon nanotube is 10-30 nm, and the length is 5-20 μm.

[0020] Preferably, the particle size of nano boron nitride is 50-200nm and the specific surface area is 30-60m 2 / g.

[0021] Preferably, the tensile strength of the basalt fiber is 2.5-3.5 GPa, and the elastic modulus is 70-90 GPa.

[0022] Preferably, the particle size of nano-titanium dioxide is 20-50 nm, and the particle size of nano-silver is 10-30 nm.

[0023] Preferably, the maleic anhydride grafting rate of the reactive compatibilizer is 1-3%, and the melt flow rate is 5-15 g / 10 min.

[0024] Preferably, in the composite molding step, nitrogen protection is introduced into the reactor, and the nitrogen flow rate is 1-3 L / min.

[0025] Preferably, the temperature of the mold is controlled at 230-250° C., and the extrusion pressure is 10-20 MPa.

[0026] (3) Beneficial technical effects

[0027] Compared with the existing technology, the beneficial effects of the present invention are:

[0028] 1. Through the use of graphene three-dimensional network construction technology, graphene and carbon nanotubes form a stable conductive network structure, which is well bonded to the polyamide matrix, significantly enhancing the tensile and flexural strength of the composite material. Compared with traditional polyamide materials and existing simple composite methods, the composite material prepared by this invention effectively disperses stress through the network structure when subjected to external forces, reducing stress concentration. This makes the tent more durable and resistant to damage, and can withstand wind, sun, rain, and accidental impacts in complex outdoor environments, significantly improving the tent's service life and reliability.

[0029] 2. The composite material exhibits excellent thermal management properties. The synergistic effect of nano-boron nitride and graphene significantly improves its thermal conductivity, enabling rapid heat dissipation in high-temperature environments and effective insulation in low-temperature environments, creating a comfortable internal environment for soldiers. Furthermore, the introduced antimicrobial treatment imparts high antibacterial properties to the material, effectively inhibiting the growth of bacteria such as Escherichia coli and Staphylococcus aureus, safeguarding the health of military personnel and reducing the risk of infection in the field. The anti-UV treatment significantly enhances the material's weather resistance, extending the tent's outdoor service life. Furthermore, the three-dimensional conductive network of graphene and carbon nanotubes imparts excellent electromagnetic shielding properties, capable of resisting external electromagnetic interference, protecting military equipment and information security, and meeting the requirements of modern electronic warfare.

[0030] 3. The melt blending and other technologies adopted in this method are easy to realize industrial production, and by adding nucleating agents, reactive compatibilizers and other means, the problems of graphene dispersion and interface bonding are effectively solved. The production process is stable and controllable, the product quality is uniform, and the production cost is low, which is conducive to large-scale promotion and application, providing the military with high-performance and multifunctional military tent materials, and improving the military's logistics support and combat capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1This is a flow chart of the preparation method of the graphene polyamide composite material for military tents proposed by the present invention;

[0032] Figure 2 is a line chart comparing the tensile strength and flexural strength of the embodiment and the comparative example;

[0033] Figure 3 It is a bar chart comparing the antibacterial rate of the embodiment and the comparative example and the strength retention rate after 1000 hours of ultraviolet aging;

[0034] Figure 4 This is a radar comparison chart produced after unifying the dimensions of the performance indicators of the embodiment and the comparative example. DETAILED DESCRIPTION

[0035] The present invention discloses a method for preparing a graphene polyamide composite material for military tents, comprising the following steps:

[0036] The steps of constructing a three-dimensional graphene network are as follows: mixing a graphene oxide dispersion with carbon nanotubes, and aligning them under an alternating electric field to form a three-dimensional graphene-carbon nanotube conductive network, followed by reduction with hydrazine hydrate vapor to obtain modified graphene;

[0037] The polyamide matrix nano-reinforcement step comprises: mixing polyamide 66 chips with nano-boron nitride and a nucleating agent, lithium benzoate, and melt blending in a twin-screw extruder at barrel temperatures of 250-260° C., 260-270° C., 270-280° C., and 265-275° C., and a pressure of 0.2-0.4 MPa, to obtain a nano-reinforced polyamide matrix;

[0038] Composite molding steps: adding modified graphene and nano-reinforced polyamide matrix into a reactor at a mass ratio of (5-10):100, adding a reactive compatibilizer, stirring at 255-265°C for 3-5 hours, and then extruding through a mold; the tensile strength σ of the composite material satisfies the formula: σ=σ0+k1×ω×(1+k2×ρ)+k3×ω 2 , where σ0 is the tensile strength of the pure polyamide matrix, ω is the mass fraction of modified graphene, ρ is the density of the graphene-carbon nanotube network, k1 = 20 to 25, k2 = 3 to 5, k3 = -8 to -5; the reactive compatibilizer is a styrene-maleic anhydride copolymer, and its structural formula is:

[0039]

[0040] The method for preparing the graphene polyamide composite material for military tents proposed by the present invention further includes:

[0041] Fiber composite step: In the composite molding step, basalt fiber is added, and the basalt fiber is pre-treated with a silane coupling agent KH-550. The treatment method is to soak the fiber in an ethanol solution of the silane coupling agent having a mass fraction of 2-5% for 1-3 hours, and then dry it at 100-120° C. for 2-4 hours. After adding the fiber, the flexural strength σf of the composite material satisfies the formula: σf=σf0+k4×Vf×(1+k5×θ), where σf0 is the flexural strength of the composite material without the addition of the fiber, Vf is the volume fraction of the fiber, and θ is the interface bonding strength coefficient between the fiber and the matrix, with a value range of 0-1, k4=60 to 80, and k5=2 to 4.

[0042] Thermal performance optimization step: After extrusion molding, the composite material is annealed at a temperature of 180-200°C for 2-4 hours.

[0043] The method for preparing the graphene polyamide composite material for military tents proposed in the present invention is characterized by further comprising:

[0044] Antibacterial treatment step: soaking the formed composite material in a mixed solution containing 0.1-0.3wt% nano-titanium dioxide and 0.05-0.15wt% nano-silver for 2-4 hours, and then drying at 60-80°C;

[0045] Anti-ultraviolet treatment step: in the composite molding step, adding 0.5-2% of the total mass of the ultraviolet absorber 2-hydroxy-4-methoxybenzophenone and 0.5-2% of the light stabilizer bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate.

[0046] In the present invention, the mass fraction of oxygen-containing functional groups in graphene oxide is 15-25%, the outer diameter of the carbon nanotube is 10-30 nm, and the length is 5-20 μm.

[0047] In the present invention, the particle size of nano boron nitride is 50-200nm, and the specific surface area is 30-60m 2 / g.

[0048] In the present invention, the tensile strength of the basalt fiber is 2.5-3.5 GPa, and the elastic modulus is 70-90 GPa.

[0049] In the present invention, the particle size of nano titanium dioxide is 20-50 nm, and the particle size of nano silver is 10-30 nm.

[0050] In the present invention, the maleic anhydride grafting rate of the reactive compatibilizer is 1-3%, and the melt flow rate is 5-15 g / 10 min.

[0051] In the present invention, in the composite molding step, nitrogen protection is introduced into the reactor, and the nitrogen flow rate is 1-3 L / min.

[0052] 10. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein the temperature of the mold is controlled at 230-250°C and the extrusion pressure is 10-20 MPa.

[0053] Example 1

[0054] Raw materials and ratio (by mass):

[0055] Graphene three-dimensional network construction: 10 kg of graphene oxide (containing 20% oxygen functional groups), 1.5 kg of carbon nanotubes (outer diameter 20 nm, length 15 μm), 200 L of deionized water, and an appropriate amount of hydrazine hydrate (reducing agent).

[0056] Polyamide matrix nano-reinforcement: polyamide 66 chips 200kg, nano boron nitride (particle size 100nm, specific surface area 45m 2 / g) 16kg, lithium benzoate (nucleating agent) 4kg.

[0057] Composite molding: modified graphene 10kg, nano-reinforced polyamide matrix 200kg, styrene-maleic anhydride copolymer (compatibilizer, grafting rate 2%) 6kg, basalt fiber (3mm, silane treatment) 10kg, nano-titanium dioxide (30nm) 0.2wt%, nano-silver (20nm) 0.1wt%, ultraviolet absorber (2-hydroxy-4-methoxybenzophenone) 1.5%, light stabilizer (bispiperidyl sebacate) 1.5%.

[0058] Detailed description of key steps:

[0059] Graphene three-dimensional network construction:

[0060] The graphene oxide dispersion and carbon nanotubes were mixed under 300 W ultrasound for 2 h to form a uniform suspension.

[0061] Applying an alternating electric field of 2 V / cm and 20 Hz causes the graphene sheets and carbon nanotubes to align to form a honeycomb conductive network (network density 0.8 mg / cm 3 ), and then hydrazine hydrate vapor (90°C, 3h) was introduced for reduction for 3 hours to remove oxygen-containing functional groups and improve conductivity (resistivity ≤10-3Ω·cm).

[0062] Polyamide matrix nano-reinforcement:

[0063] Polyamide 66 chips were vacuum dried at 110°C for 8 hours to remove moisture, and then melt-blended with nano-boron nitride and lithium benzoate through a twin-screw extruder (aspect ratio 38:1). The temperatures of the four barrel zones were 255°C, 265°C, 275°C, and 270°C, the screw speed was 250 r / min, and the pressure was 0.3 MPa, forming a matrix in which nano-boron nitride was uniformly dispersed (dispersion ≥ 95%).

[0064] Composite molding and functionalization:

[0065] The modified graphene and the matrix were stirred in a reactor at 260°C at 500 r / min for 4 hours, nitrogen (flow rate 2 L / min) was introduced to prevent oxidation, silane-treated basalt fiber (interface bonding strength coefficient θ = 0.8) was added, and the mixture was extruded through a mold at 240°C and a pressure of 15 MPa, and pelletized after cooling.

[0066] The extrudate was annealed at 190°C for 3 hours (heating / cooling rates of 5°C / min, 3°C / min), the crystallinity increased from 45% to 65%, and the heat deformation temperature reached 205°C.

[0067] Immerse in nano-titanium dioxide / silver mixture for 3 hours and dry at 60°C to form an antibacterial layer (antibacterial rate ≥ 99.5%); UV absorber and light stabilizer are evenly distributed on the matrix, and the strength retention rate is 88% after 1000h of ultraviolet aging.

[0068] Performance parameters:

[0069] Mechanical properties: tensile strength 125MPa, flexural strength 155MPa, 67% / 68% higher than pure polyamide.

[0070] Thermal management performance: Thermal conductivity is 12W / m·K, 40 times that of pure polyamide, and heat dissipation efficiency is increased by 75% in high temperature environments.

[0071] Functional characteristics: Electromagnetic shielding effectiveness 28dB (10MHz-1GHz), can resist radar interference; self-repair efficiency (0.2mm crack) 85%, automatically healed within 24 hours.

[0072] Example 2

[0073] Raw materials and ratio adjustment:

[0074] Graphene network: 8 kg of graphene oxide, 1.2 kg of carbon nanotubes, electric field strength 1.5 V / cm, frequency 25 Hz, network density 0.6 mg / cm 3 .

[0075] Polyamide matrix: nano-boron nitride 14 kg, lithium benzoate 3.5 kg, screw speed 240 r / min, pressure 0.28 MPa.

[0076] Composite molding: 5kg of compatibilizer, 8kg of basalt fiber, annealing temperature of 185℃, 1.2% each of UV absorber and light stabilizer.

[0077] Process differences:

[0078] The graphene network density is reduced but the orientation degree is improved (the alignment rate along the electric field direction is 92%), which improves the flexibility of the composite material (elongation at break is 38%).

[0079] The amount of nano-boron nitride is reduced but the specific surface area is increased to 50m 2 / g, the thermal resistance of the interface with the substrate is reduced, and the thermal deformation temperature is maintained at 200℃.

[0080] The volume fraction of basalt fiber (Vf) is 4%, the interface bonding coefficient θ is 0.7, and the bending strength is 148 MPa, which is 35% higher than that without fiber (σf0=110 MPa).

[0081] Performance highlights:

[0082] Impact resistance: Izod beam impact strength reaches 85kJ / m 2 , which is 12% higher than that of Example 1 and is suitable for use in complex terrains.

[0083] Antibacterial effect: When the nanosilver loading is 0.08wt%, the antibacterial period is extended to 6 months (the antibacterial rate against Escherichia coli is ≥99%).

[0084] Example 3

[0085] Raw materials and ratio adjustment:

[0086] Graphene network: 12 kg of graphene oxide, 1.8 kg of carbon nanotubes, electric field strength 2.5 V / cm, frequency 15 Hz, network density 1.0 mg / cm 3 .

[0087] Polyamide matrix: nano-boron nitride 18 kg, lithium benzoate 4.5 kg, screw speed 260 r / min, pressure 0.32 MPa.

[0088] Composite molding: 7kg of compatibilizer, 12kg of basalt fiber, annealing temperature 195℃, 2% each of UV absorber and light stabilizer.

[0089] Process enhancement:

[0090] The high-concentration graphene network forms a continuous conductive path, and the electromagnetic shielding effectiveness is improved to 30dB (can shield GPS interference signals).

[0091] Nano-boron nitride and graphene synergistically conduct heat, with a thermal conductivity of 14W / m·K, and the thermal insulation performance in low-temperature environments is improved by 40% (temperature difference ≤ 5℃ / h).

[0092] Increasing the amount of compatibilizer increases the interfacial bonding energy by 25%, and the tensile strength reaches 132MPa, which is close to the strength of metallic aluminum (140-150MPa).

[0093] Extreme environment testing:

[0094] High temperature resistance: After being placed in an 80°C oven for 1000 hours, the tensile strength retention rate is 95% (only 60% for the comparative example).

[0095] Anti-ultraviolet: After 2000h of UV aging, the color change ΔE≤2, while the comparative example ΔE=8, indicating that the outdoor service life is extended by more than 2 times.

[0096] Comparative Example

[0097] 200 kg of polyamide 66 chips were directly put into a single-screw extruder with a barrel temperature of 260°C and a screw speed of 150 r / min for extrusion granulation without adding any graphene, nano-boron nitride, fiber or functional additives.

[0098] The performance test comparison of the embodiment and the comparative example is shown in the following table:

[0099]

[0100]

[0101] Conclusion: The tensile strength and flexural strength of the three embodiments are significantly higher than those of the comparative example, indicating that the preparation method of the present invention can effectively enhance the mechanical properties of the composite material; although the comparative example has a higher elongation at break, the strength is insufficient and cannot meet the high-strength requirements of military tents. The tensile strength and flexural strength of the three embodiments are significantly higher than those of the comparative example, indicating that the preparation method of the present invention can effectively enhance the mechanical properties of the composite material; although the comparative example has a higher elongation at break, the strength is insufficient and cannot meet the high-strength requirements of military tents.

[0102] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a graphene polyamide composite material for military tents, characterized in that: The following steps are involved: The steps of constructing a three-dimensional graphene network are as follows: mixing a graphene oxide dispersion with carbon nanotubes, and aligning them under an alternating electric field to form a three-dimensional graphene-carbon nanotube conductive network, followed by reduction with hydrazine hydrate vapor to obtain modified graphene; The polyamide matrix nano-reinforcement step comprises: mixing polyamide 66 chips with nano-boron nitride and a nucleating agent, lithium benzoate, and melt blending in a twin-screw extruder at barrel temperatures of 250-260° C., 260-270° C., 270-280° C., and 265-275° C., and a pressure of 0.2-0.4 MPa, to obtain a nano-reinforced polyamide matrix; Composite molding steps: adding modified graphene and nano-reinforced polyamide matrix into a reactor at a mass ratio of (5-10):100, adding a reactive compatibilizer, stirring at 255-265°C for 3-5 hours, and then extruding through a mold; the tensile strength σ of the composite material satisfies the formula: σ=σ0+k1×ω×(1+k2×ρ)+k3×ω 2 , where σ0 is the tensile strength of the pure polyamide matrix, ω is the mass fraction of modified graphene, ρ is the density of the graphene-carbon nanotube network, k1 = 20 to 25, k2 = 3 to 5, k3 = -8 to -5; the reactive compatibilizer is a styrene-maleic anhydride copolymer, and its structural formula is:

2. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein: Also includes: Fiber composite step: In the composite molding step, basalt fiber is added, and the basalt fiber is pre-treated with a silane coupling agent KH-550. The treatment method is to soak the fiber in an ethanol solution of the silane coupling agent having a mass fraction of 2-5% for 1-3 hours, and then dry it at 100-120° C. for 2-4 hours. After adding the fiber, the flexural strength σf of the composite material satisfies the formula: σf=σf0+k4×Vf×(1+k5×θ), where σf0 is the flexural strength of the composite material without the addition of the fiber, Vf is the volume fraction of the fiber, and θ is the interface bonding strength coefficient between the fiber and the matrix, with a value range of 0-1, k4=60 to 80, and k5=2 to 4. Thermal performance optimization step: After extrusion molding, the composite material is annealed at a temperature of 180-200°C for 2-4 hours.

3. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein: Also includes: Antibacterial treatment step: soaking the formed composite material in a mixed solution containing 0.1-0.3wt% nano-titanium dioxide and 0.05-0.15wt% nano-silver for 2-4 hours, and then drying at 60-80°C; Anti-ultraviolet treatment step: in the composite molding step, adding 0.5-2% of the total mass of the ultraviolet absorber 2-hydroxy-4-methoxybenzophenone and 0.5-2% of the light stabilizer bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate.

4. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein: The mass fraction of oxygen-containing functional groups in the graphene oxide is 15-25%, the outer diameter of the carbon nanotube is 10-30 nm, and the length is 5-20 μm.

5. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein: The particle size of nano boron nitride is 50-200nm and the specific surface area is 30-60m 2 / g.

6. The method for preparing a graphene polyamide composite material for military tents according to claim 2, wherein: The tensile strength of basalt fiber is 2.5-3.5GPa and the elastic modulus is 70-90GPa.

7. The method for preparing a graphene polyamide composite material for military tents according to claim 3, wherein: The particle size of nano-titanium dioxide is 20-50nm, and the particle size of nano-silver is 10-30nm.

8. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein: The maleic anhydride grafting rate of the reactive compatibilizer is 1-3%, and the melt flow rate is 5-15 g / 10 min.

9. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein: During the composite molding step, nitrogen protection is introduced into the reactor with a nitrogen flow rate of 1-3 L / min.

10. The method for preparing a graphene polyamide composite material for military tents according to claim 1, wherein: The temperature of the mold is controlled at 230-250°C and the extrusion pressure is 10-20 MPa.

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