Preparation method of bulletproof material for civil vehicles

Abstract

The invention discloses a preparation method of a bulletproof material for civil vehicles, and relates to the technical field of vehicle safety protection, and the preparation method comprises the following steps: preparing a material, and carrying out pretreatment and parameter calibration on the material; performing staged hot-pressing compounding on the pretreated material based on a hot-pressing compounding process; and carrying out vacuum curing and post-treatment on the material. According to the preparation method of the bulletproof material for the civil vehicle, the protection capacity, stability and durability are effectively improved through multi-layer composite structure design, a staged hot-pressing composite process, vacuum curing and post-treatment, the aramid fiber gummed cloth and the PEUD cloth are compounded, low density and high strength are ensured, the bulletproof effect is improved, the hot-pressing process is accurately controlled, and the bulletproof effect is improved. The resin is fully cured, interlayer bonding is enhanced, waterproof and anti-ultraviolet treatment is performed, the environmental adaptability is enhanced, the UL752 Level8 standard is met, performance and cost are both considered, the resin is suitable for the civil field, and better use prospects and commercial value are brought.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safety protection, and specifically relates to a preparation method of a bulletproof material for civilian vehicles. Background Art

[0002] Existing bulletproof materials for civilian vehicles are mainly composed of multiple layers of composite materials, and usually use high-strength materials such as aramid fibers and ultra-high molecular weight polyethylene. These materials are usually prepared by a hot pressing composite process, which involves processes such as heating, pressing, and cooling of the materials to improve their strength and toughness.

[0003] In the prior art, the performance and stability of bulletproof materials are limited in the following aspects: while existing bulletproof materials meet the basic protection standards, their long-term stability in extreme environments is poor, and the materials are easily eroded by ultraviolet rays, chemical substances, or moisture, resulting in reduced performance; the structural layers of existing bulletproof materials are relatively simple, lacking effective breathable areas and isolation film designs, which easily lead to delamination between layers, affecting the protection performance and service life of the materials; although the hot pressing composite process has been widely used, the fineness of the hot pressing stage, pressure control, and temperature control of the materials is relatively low, which may lead to incomplete curing of the resin, affecting the stability and strength of the materials; the bulletproof materials in the prior art do not fully consider the adaptability to extreme temperature changes or high humidity environments, resulting in unstable performance of the materials in these environments. Summary of the Invention

[0004] To solve the above technical problems, a preparation method of a bulletproof material for civilian vehicles is provided, and the present technical solution solves the above problems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A preparation method of a bulletproof material for civilian vehicles, comprising: S1: Prepare materials, perform pretreatment on the materials, and calibrate parameters; S2: Perform staged hot pressing and compounding on the pretreated materials based on the hot pressing composite process; S3: Perform vacuum curing and post-treatment on the materials.

[0006] Preferably, the preparation of materials, pretreatment of materials, and parameter calibration specifically include: Prepare aramid-coated fabric / PEUD fabric with an aromatic hydrocarbon concentration of 10% - 15%, and enhance the molecular chain strength through chain copolymerization reaction; Use laser cutting to cut the aramid-coated fabric / PEUD fabric into a preset size, and remove the burrs on the edge of the sheet metal part; Determine the number of layers and gram weight of the aramid-coated fabric / PEUD fabric according to the type of bullet to be protected and the finished product thickness, and lay them layer by layer on the sheet metal part and the mold.

[0007] Preferably, the step of performing staged hot pressing and compounding on the pretreated material based on a hot pressing and compounding process specifically includes: Lay a vacuum bag, a breather felt, a separator film, and an aramid coated fabric / PEUD fabric material in sequence to form an integral vacuum bag, and use a vacuum pump to evacuate to over - 99%; Place the composite material in a hot pressing autoclave for hot pressing and compounding, which specifically includes the following stages: The preheating stage is from 50°C to 85°C to activate the resin fluidity; The hot pressing stage is from 90°C to 130°C. By gradually increasing the temperature and applying pressure, ensure that the resin is completely cured and the interlayer bonding strength is enhanced; The heat preservation and pressure holding stage is at 130°C and 2500 KPa for 90 minutes to ensure the stability and performance of the bulletproof laminate; The cooling stage is from 130°C to 35°C, and the pressure is reduced to atmospheric pressure to complete the cooling and curing after hot pressing.

[0008] Preferably, the staged hot pressing and compounding specifically includes: The staged hot pressing and compounding includes 14 - stage temperature - pressure coordinated control, including: Stages 1 - 3: The temperature rises from 50°C to 85°C, the heating rate does not exceed 5°C / min, and the pressure is gradually loaded from 0 to 1000 KPa; Stages 4 - 6: The temperature rises from 100°C to 125°C, the heating rate does not exceed 3°C / min, and the pressure increases from 1200 KPa to 2000 KPa; Stages 7 - 10: The temperature rises from 125°C to 130°C, the heating rate does not exceed 1.5°C / min, and the pressure increases from 2000 KPa to 2500 KPa; Stages 11 - 14: Cool down to 35°C, the cooling rate does not exceed 5°C / min, maintain a pressure of 2500 KPa until the temperature reaches 65°C and then reduce the pressure.

[0009] Preferably, in the high - temperature curing process of stages 7 - 10, the temperature is controlled at 130°C, the pressure is controlled at 2500 KPa, and the heat preservation time is 90 minutes to ensure that the resin is completely cross - linked and the cross - linking degree reaches ≥95%.

[0010] Preferably, the steps of performing vacuum curing and post - treatment on the material specifically include: Load the semi - finished product after hot pressing into a silica gel vacuum bag and evacuate to - 0.1 MPa to remove residual volatiles; Keep the temperature constant at 125°C in the curing tank for 2 hours to further stabilize the resin network structure; Laser trimming with an accuracy of ±0.1 mm, and scrub the surface to Ra ≤ 0.8 μm; Internal defects are detected by X-rays, and bubbles with a diameter of ≤0.1 mm are qualified.

[0011] Preferably, the composition of the bulletproof material includes the following functional layers: Weather-resistant surface layer: a PEUD cloth layer with a thickness of 0.5 - 1.2 mm, modified by aromatic hydrocarbon concentration regulation and chain copolymerization; Bulletproof fiber base layer: aramid and ultra-high molecular weight polyethylene fibers, with a surface density of 100 - 500 g / m² and a fiber orientation error of ≤5°; Isolation film and breathable area: the polyimide film has a thickness of 0.05 - 0.1 mm, and the breathable area is a porous silica gel layer with a pore diameter of 50 - 100 μm and an area ratio of 10% - 15%; Adhesive layer: an epoxy resin film with a thickness of 0.1 - 0.3 mm, containing nano-silica reinforcing particles with a particle size of 20 - 50 nm.

[0012] Preferably, the porous silica gel layer in the breathable area undergoes local pressure relief, so that the internal air pressure peak during the hot pressing process does not exceed 200 KPa, thereby avoiding delamination between layers; The weight density of the bulletproof material is controlled below 1.8 g / cm³ and can meet the UL752 Level 8 protection standard; During the staged hot pressing and compounding process, the compression rate of the fiber layer of the material is controlled between 8% and 12%; The bulletproof material can resist 7.62 mm rifle bullets and maintain excellent performance in the environment of -40°C to 85°C.

[0013] Preferably, the surface of the bulletproof material has a waterproof coating with a thickness of 0.1 - 0.2 mm. The waterproof coating is made of polytetrafluoroethylene material, which has water resistance and chemical corrosion resistance, prevents moisture penetration and reduces surface contamination of the material.

[0014] Preferably, the overall structure of the bulletproof material is treated against ultraviolet rays, and it can be used for a long time in an environment with strong ultraviolet rays without performance degradation, making the material more stable in the environment of high temperature, high humidity and strong ultraviolet irradiation.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The preparation method of the civilian vehicle bulletproof material provided by the present invention effectively improves the protection ability, stability and durability through multi-layer composite structure design, staged hot pressing and compounding process, vacuum curing and post-treatment. The composite of aramid coated cloth and PEUD cloth ensures low density and high strength, improves the bulletproof effect, precisely controls the hot pressing process, ensures complete curing of the resin, enhances the interlayer adhesion, and the waterproof and anti-ultraviolet treatments enhance the environmental adaptability. It meets the UL752 Level 8 standard, balances performance and cost, and is applicable to the civilian field. Description of the Drawings

[0016] Figure 1 is a framework diagram of the preparation steps of the present invention; Figure 2 is a detailed process flow diagram of the present invention. Detailed Description of the Invention

[0017] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0018] Referring to Figure 1 shown, a method for preparing a bulletproof material for a civilian vehicle includes: S1: Prepare materials, perform pretreatment on the materials and calibrate parameters; S2: Perform staged hot pressing and compounding on the pretreated materials based on the hot pressing and compounding process; S3: Perform vacuum curing and post-treatment on the materials.

[0019] Preparing materials, performing pretreatment on the materials and calibrating parameters specifically include: Prepare aramid coated fabric / PEUD fabric with an aromatic hydrocarbon concentration of 10% - 15%, and enhance the molecular chain strength through chain copolymerization reaction; Use laser cutting to cut the aramid coated fabric / PEUD fabric to a preset size, and remove the burrs on the edge of the sheet metal part; According to the type of bullet to be protected and the thickness of the finished product, determine the number of layers and gram weight of the aramid coated fabric / PEUD fabric, and lay them layer by layer on the sheet metal part and the mold.

[0020] Performing staged hot pressing and compounding on the pretreated materials based on the hot pressing and compounding process specifically includes: Lay the vacuum bag, breather felt, separator film and aramid coated fabric / PEUD fabric materials in sequence to form a whole vacuum bag, and use a vacuum pump to evacuate to more than -99%; Place the composite material in a hot press can for hot pressing and compounding, which specifically includes the following stages: The preheating stage is from 50°C to 85°C to activate the resin fluidity; The hot pressing stage is from 90°C to 130°C. By gradually increasing the temperature and applying pressure, ensure that the resin is completely cured and the interlayer bonding strength is enhanced; The heat preservation and pressure maintenance stage is 130°C, 2500KPa, lasting for 90 minutes to ensure the stability and performance of the bulletproof laminate; The cooling stage is from 130°C to 35°C, and the pressure is reduced to atmospheric pressure to complete the cooling and curing after hot pressing.

[0021] The staged hot pressing and compounding specifically includes: The staged hot pressing and compounding includes 14 stages of temperature-pressure coordinated control, including: Stages 1-3: The temperature rises from 50°C to 85°C, with a heating rate not exceeding 5°C / min, and the pressure is gradually loaded from 0 to 1000 KPa; Stages 4-6: The temperature rises from 100°C to 125°C, with a heating rate not exceeding 3°C / min, and the pressure increases from 1200 KPa to 2000 KPa; Stages 7-10: The temperature rises from 125°C to 130°C, with a heating rate not exceeding 1.5°C / min, and the pressure increases from 2000 KPa to 2500 KPa; Stages 11-14: The temperature is lowered to 35°C, with a cooling rate not exceeding 5°C / min, and the pressure of 2500 KPa is maintained until 65°C and then the pressure is reduced.

[0022] During the high-temperature curing process of Stages 7-10, the temperature is controlled at 130°C, the pressure is controlled at 2500 KPa, and the heat preservation time is 90 minutes to ensure complete cross-linking of the resin and the cross-linking degree reaches ≥95%.

[0023] Vacuum curing and post-treatment include: The semi-finished product after hot pressing is loaded into a silica gel vacuum bag, and the vacuum is pumped to -0.1 MPa to remove residual volatiles; It is kept at a constant temperature of 125°C in the curing tank for 2 hours to further stabilize the resin network structure; Laser trimming is performed with an accuracy of ±0.1 mm, and the surface is scrubbed to Ra ≤ 0.8 μm; Internal defects are detected by X-ray, and the product is qualified if the bubble diameter ≤ 0.1 mm.

[0024] The composition of the bulletproof material includes the following functional layers: Weather-resistant surface layer: PEUD cloth layer, with a thickness of 0.5 - 1.2 mm, modified by aromatic hydrocarbon concentration regulation and chain copolymerization; Bulletproof fiber base layer: aramid and ultra-high molecular weight polyethylene fiber, with a surface density of 100 - 500 g / m² and a fiber orientation error ≤ 5°; Isolation film and breathable area: polyimide film with a thickness of 0.05 - 0.1 mm, and the breathable area is a porous silica gel layer with a pore diameter of 50 - 100 μm and an area ratio of 10% - 15%; Adhesive layer: epoxy resin film with a thickness of 0.1 - 0.3 mm, containing nano-silica reinforcing particles with a particle size of 20 - 50 nm.

[0025] The porous silica gel layer in the breathable area relieves pressure locally, so that the internal air pressure peak during the hot pressing process does not exceed 200 KPa, thus avoiding interlayer delamination; The weight density of the bulletproof material is controlled below 1.8 g / cm³ and can meet the UL752 Level 8 protection standard; During the staged hot pressing and compounding process, the compression rate of the fiber layer of the material is controlled between 8% and 12%; The bulletproof material can resist 7.62 mm rifle bullets and maintain excellent performance in the environment of -40°C to 85°C.

[0026] The surface of the bulletproof material has a waterproof coating with a thickness of 0.1 - 0.2 mm. The waterproof coating is made of polytetrafluoroethylene material, which has water resistance and chemical corrosion resistance, prevents water penetration and reduces surface contamination of the material.

[0027] The overall structure of the bulletproof material is treated against ultraviolet rays, can be used for a long time in an environment with strong ultraviolet rays without performance degradation, and makes the material have stronger long-term stability in the environment of high temperature, high humidity and strong ultraviolet irradiation.

[0028] Example 1: Material preparation: Select aramid coated fabric and PEUD fabric with an aromatic hydrocarbon concentration of 12% for chain copolymerization reaction to enhance the strength of molecular chains; Use laser cutting to cut the coated fabric to meet the design size and remove the edge burrs; According to the protection requirements, select 3 layers of aramid coated fabric and PEUD fabric with a grammage of 400 g / m² and lay them in the mold; Hot pressing and compounding process: Lay the aramid coated fabric and PEUD fabric in sequence and place them in a vacuum bag to evacuate to -99%; Conduct 14-stage staged hot pressing in a hot press: preheat to 80°C, hot press to 130°C, apply a pressure of 2500 KPa, keep warm for 90 minutes, and finally cool down to 35°C; Vacuum curing and post-treatment: Place the semi-finished product in a silicone vacuum bag, evacuate to -0.1 MPa to remove volatile substances; Keep the temperature constant at 125°C for 2 hours in the curing tank to further stabilize the resin structure; Laser trimming to an accuracy of ±0.1 mm, surface treatment to Ra ≤ 0.8 μm, and qualified X-ray detection; Functional layer composition: Weather-resistant surface layer: 0.8 mm PEUD fabric, modified by regulating the aromatic hydrocarbon concentration and chain copolymerization; Bulletproof fiber base layer: aramid and ultra-high molecular weight polyethylene fiber, with a surface density of 400 g / m²; Isolation film and breathable area: polyimide film with a thickness of 0.08 mm, porous silica gel layer in the breathable area with a pore diameter of 60 μm; Adhesive layer: Epoxy resin film containing nano-silica particles with a particle size of 30 nm; Performance: The bulletproof material can effectively resist 7.62 mm rifle bullets, with a weight density of 1.7 g / cm³, meeting the UL752 Level 8 standard.

[0029] Example 2: Material preparation: Select aramid coated fabric and PEUD fabric with an aromatic hydrocarbon concentration of 10% for chain copolymerization reaction; Use laser cutting to cut the coated fabric to the preset size and remove burrs; According to the protection requirements, select 2 layers of aramid coated fabric and PEUD fabric with a gram weight of 350 g / m² and lay them in the mold; Hot pressing composite process: Conduct hot pressing treatment according to the 14-stage phased hot pressing process: preheat to 75 °C, hot press to 125 °C, apply a pressure of 2000 KPa, keep warm for 60 minutes, and cool down to 35 °C; Vacuum curing and post-treatment: Place the semi-finished product into a silicone vacuum bag, evacuate to -0.1 MPa to remove volatiles; Keep the temperature constant at 120 °C in the curing tank for 2 hours to stabilize the resin network; Laser trimming to an accuracy of ±0.1 mm, surface treatment to Ra ≤ 0.8 μm, and qualified X-ray detection; Functional layer composition: Weather-resistant surface layer: 1.0 mm PEUD fabric, modified by aromatic hydrocarbon concentration regulation and chain copolymerization; Bulletproof fiber base layer: Aramid and ultra-high molecular weight polyethylene fibers with a surface density of 350 g / m²; Isolation film and breathable area: Polyimide film with a thickness of 0.05 mm, porous silica gel layer in the breathable area with a pore size of 50 μm; Adhesive layer: Epoxy resin film containing nano-silica particles with a particle size of 40 nm; Performance: The bulletproof material can effectively resist 7.62 mm rifle bullets, with a weight density of 1.75 g / cm³, meeting the UL752 Level 8 standard.

[0030] Example 3: Material preparation: Select aramid coated fabric and PEUD fabric with an aromatic hydrocarbon concentration of 15% for chain copolymerization reaction to enhance the molecular chain strength; Use laser cutting to cut the coated fabric to the design size and remove the edge burrs; According to the protection requirements, select 4 layers of aramid coated fabric and PEUD fabric with a gram weight of 450 g / m² and lay them in the mold; Hot pressing composite process: Carry out hot pressing treatment according to the 14-stage staged hot pressing process: preheat to 85 °C, hot press to 130 °C, apply a pressure of 2500 KPa, keep warm for 90 minutes, and cool down to 35 °C; Vacuum curing and post-treatment: Place the semi-finished product into a silicone vacuum bag, evacuate to -0.1 MPa to remove volatile substances; Keep the temperature constant at 130 °C in the curing tank for 2 hours to further stabilize the resin network; Laser trimming to an accuracy of ±0.1 mm, surface treatment to Ra ≤ 0.8 μm, and qualified X-ray detection; Composition of the functional layer: Weather-resistant surface layer: 0.6 mm PEUD cloth, modified by aromatic hydrocarbon concentration regulation and chain copolymerization; Bulletproof fiber base layer: aramid and ultra-high molecular weight polyethylene fiber, with a surface density of 500 g / m²; Isolation film and breathable area: polyimide film, with a thickness of 0.1 mm, and a porous silica gel layer in the breathable area with a pore diameter of 70 μm; Adhesive layer: epoxy resin film containing nano-silica particles with a particle size of 30 nm; Performance: The bulletproof material can effectively resist 7.62 mm rifle bullets, with a weight density of 1.6 g / cm³, meeting the UL752 Level 8 standard.

[0031] Comparative example: Traditional method: Material preparation: Use traditional aramid cloth and polyethylene fiber without carrying out chain copolymerization reaction; Hot pressing composite: Adopt single temperature and pressure conditions, unable to achieve precise control; Vacuum curing and post-treatment: Do not use vacuum curing technology, resulting in possible internal defects and instability of the material; Performance of the finished product: Usually unable to effectively resist high-threat bullets, and with a heavy weight, unable to meet some lightweight requirements.

[0032] Method of the present invention: Material preparation: Enhance the molecular chain strength through chain copolymerization reaction, select high-quality aramid coated cloth and PEUD cloth to improve the overall performance of the material; Hot pressing composite: Adopt a staged hot pressing process to precisely control temperature, pressure and time to ensure complete curing of the resin and enhance the interlayer bonding strength; Vacuum curing and post-treatment: Remove residual volatile substances through vacuum curing, use laser trimming and X-ray detection to ensure the accuracy and stability of the material; Finished product performance: It can effectively resist 7.62mm rifle bullets, has low weight density, complies with UL752Level8 protection standards, and has excellent environmental adaptability.

[0033] In summary, the advantages of the present invention are: This solution designs a multifunctional layered structure including a weather-resistant surface layer, a bulletproof fiber base layer, an isolation membrane and a breathable area, as well as an adhesive layer. This structure not only improves the protective ability of the bulletproof material, but also effectively avoids interlayer peeling through the design of the breathable area, thereby improving the stability of the material in different environments; During the material pretreatment process, chain copolymerization is used to enhance the molecular chain strength of the aramid coated fabric / PEUD fabric, thereby improving the overall mechanical properties and impact resistance of the material. This improvement enables the material to better absorb and disperse energy when subjected to ballistic impact; This solution adopts a refined hot-pressing composite process with 14 stages of temperature-pressure coordinated control, including multiple stages of temperature and pressure changes to ensure complete cross-linking of the resin, with a cross-linking degree of ≥95%. This fine control ensures the maximum interlayer bonding strength and overall performance of the bullet-proof material; Through vacuum curing and post-processing technology, this solution further optimizes the network structure of the resin and ensures the stability of the material. During the curing process, a silicone vacuum bag is used to evacuate to -0.1MPa and cure at a constant temperature, further improving the performance of the material. This solution adds a waterproof coating to the surface of the bulletproof material and performs UV protection on the overall structure, so that it can be used for a long time in extreme environments without performance degradation. This treatment improves the material's environmental resistance and is particularly suitable for applications where vehicles are exposed to the external environment for a long time. After the above optimization treatment, the bulletproof material of this scheme can not only resist 7.62mm rifle bullets, but also maintain excellent performance in extreme environments of -40℃ to 85℃, and is widely adapted to various harsh environmental conditions; The composite structure of aramid coated cloth and PEUD cloth, as well as lamination technology, provides higher protection capabilities. The optimization of the bulletproof fiber base layer can effectively resist the penetration of high-threat bullets such as rifle bullets, while ensuring that the weight density of the material is less than 1.8g / cm³, so that the bulletproof plate can provide excellent protection without adding too much weight; Through precise temperature-pressure control, the resin is fully cured and the interlayer bonding strength is enhanced, which greatly improves the overall stability and bulletproof effect of the composite material. Especially in the high temperature stage, the resin cross-linking degree reaches ≥95%, which further ensures the strength and durability of the bulletproof material. By placing the material in a vacuum environment to remove residual volatiles, internal defects are eliminated, ensuring the stability of the material during long-term use. In addition, laser trimming and surface precision treatment make the material surface smooth and the dimensions precise, meeting strict precision requirements; The surface of the bulletproof material has a waterproof coating, which can effectively prevent water penetration and reduce surface contamination. Through anti-ultraviolet treatment, the stability of the material under strong ultraviolet radiation is ensured, and it can be used in high-temperature, high-humidity, and strong-ultraviolet radiation environments for a long time without performance degradation; By optimizing the thickness and fiber orientation of each layer of material, the manufacturing cost is reduced, the comprehensive performance of the bulletproof material is improved, and the requirements of the UL752 Level 8 protection standard are met at the same time, making the bulletproof material have a high cost performance in the civilian field.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the principles described in the specification are only the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation method of a bulletproof material for civilian vehicles, characterized in that, Including: S1: Prepare materials, perform pretreatment on the materials and calibrate parameters; S2: Conduct staged hot pressing and compounding on the pretreated materials based on the hot pressing and compounding process; S3: Perform vacuum curing and post-treatment on the materials.

2. The preparation method of an anti - bullet material for civilian vehicles according to claim 1, characterized in that, The preparation of materials, pretreatment of materials and parameter calibration specifically include: Prepare aramid coated fabric / PEUD fabric with an aromatic hydrocarbon concentration of 10% - 15%, and enhance the molecular chain strength through chain copolymerization reaction; Use laser cutting to cut the aramid coated fabric / PEUD fabric to the preset size, and remove the burrs on the edge of the sheet metal part; According to the type of bullet to be protected and the finished product thickness, determine the number of layers and gram weight of the aramid coated fabric / PEUD fabric, and lay them layer by layer on the sheet metal part and the mold.

3. The preparation method of a bulletproof material for a civilian vehicle according to claim 1, characterized in that, The staged hot pressing and compounding of the pretreated materials based on the hot pressing and compounding process specifically include: Lay the vacuum bag, breather felt, separator film and aramid coated fabric / PEUD fabric materials in sequence to form a whole vacuum bag, and use a vacuum pump to evacuate to more than -99%; Place the composite material in a hot press can for hot pressing and compounding, which specifically includes the following stages: The preheating stage is from 50°C to 85°C to activate the resin fluidity; The hot pressing stage is from 90°C to 130°C. By gradually increasing the temperature and applying pressure, ensure that the resin is completely cured and the interlayer bonding strength is enhanced; The heat preservation and pressure holding stage is 130°C, 2500KPa, lasting for 90 minutes to ensure the stability and performance of the bulletproof laminate; The cooling stage is from 130°C to 35°C, and the pressure is reduced to atmospheric pressure to complete the cooling and curing after hot pressing.

4. The preparation method of an anti - bullet material for civilian vehicles according to claim 3, characterized in that, The staged hot pressing and compounding specifically includes: The staged hot pressing and compounding includes 14 segments of temperature-pressure coordinated control, including: The 1st - 3rd segments: The temperature rises from 50°C to 85°C, and the heating rate does not exceed 5°C / min, and the pressure is gradually loaded from 0 to 1000KPa; The 4th - 6th segments: The temperature rises from 100°C to 125°C, and the heating rate does not exceed 3°C / min, and the pressure increases from 1200KPa to 2000KPa; The 7th - 10th segments: The temperature rises from 125°C to 130°C, and the heating rate does not exceed 1.5°C / min, and the pressure increases from 2000KPa to 2500KPa; The 11th - 14th segments: Cool down to 35°C, and the cooling rate does not exceed 5°C / min, maintain a pressure of 2500KPa until 65°C and then reduce the pressure.

5. The preparation method of an anti - ballistic material for civilian vehicles according to claim 4, characterized in that: In the high-temperature curing process of the 7th - 10th segments, the temperature is controlled at 130°C, the pressure is controlled at 2500KPa, and the heat preservation time is 90 minutes to ensure that the resin is completely cross-linked and the cross-linking degree reaches ≥95%.

6. The preparation method of a bulletproof material for a civilian vehicle according to claim 1, characterized in that, The vacuum curing and post-treatment of the materials specifically include: Put the semi-finished product after hot pressing into a silica gel vacuum bag, and evacuate to -0.1MPa to remove the residual volatiles; Keep the temperature constant at 125°C in the curing tank for 2 hours to further stabilize the resin network structure; Laser trimming, with an accuracy of ±0.1mm, and scrub the surface to Ra ≤ 0.8μm; Detect internal defects through X-ray, and the qualified bubble diameter is ≤ 0.1mm.

7. The preparation method of an anti - bullet material for civilian vehicles according to claim 1, characterized in that, The composition of the bulletproof material includes the following functional layers: Weather-resistant surface layer: PEUD fabric layer with a thickness of 0.5 - 1.2 mm, modified by aromatic hydrocarbon concentration regulation and chain copolymerization; Bulletproof fiber base layer: aramid and ultra-high molecular weight polyethylene fibers with a surface density of 100 - 500 g / m² and a fiber orientation error ≤ 5°; Isolation film and breathable area: polyimide film with a thickness of 0.05 - 0.1 mm, and the breathable area is a porous silica gel layer with a pore diameter of 50 - 100 μm and an area ratio of 10% - 15%; Adhesive layer: epoxy resin film with a thickness of 0.1 - 0.3 mm, containing nano-silica reinforcing particles with a particle size of 20 - 50 nm.

8. A method for preparing a bulletproof material for civilian vehicles according to claim 1, wherein: The porous silica gel layer in the breathable area undergoes local pressure relief to ensure that the internal air pressure peak during the hot pressing process does not exceed 200 KPa, thereby avoiding interlayer delamination; The weight density of the bulletproof material is controlled below 1.8 g / cm³ and can meet the UL752 Level 8 protection standard; During the staged hot pressing and compounding process, the compression rate of the fiber layer of the material is controlled between 8% and 12%; The bulletproof material can withstand 7.62 mm rifle bullets and maintain excellent performance in the environment of -40°C to 85°C.

9. The preparation method of a bulletproof material for civilian vehicles according to claim 1, characterized in that: The surface of the bulletproof material has a waterproof coating with a thickness of 0.1 - 0.2 mm. The waterproof coating is made of polytetrafluoroethylene material, which has water resistance and chemical corrosion resistance, preventing water penetration and reducing surface contamination of the material.

10. The preparation method of a bulletproof material for a civilian vehicle according to claim 1, characterized in that: The overall structure of the bulletproof material is treated against ultraviolet rays and can be used for a long time in an environment with strong ultraviolet rays without performance degradation, making the material more stable in the environment of high temperature, high humidity, and strong ultraviolet irradiation.

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