A polyimide fiber bulletproof and impact-resistant composite board and a preparation method thereof

Abstract

The application provides a polyimide fiber bulletproof impact-resistant composite board and a preparation method thereof, and comprises the following steps: a center flow guide layer is made of a polyimide high-strength and high-toughness filament unidirectional cloth; a first bulletproof layer is stacked on the center flow guide layer; and a second bulletproof layer is stacked on the center flow guide layer; the center flow guide layer is clamped between the first bulletproof layer and the second bulletproof layer, the first bulletproof layer and the second bulletproof layer are each made of a polyimide plain cloth or a polyimide needle felt; the center flow guide layer, the first bulletproof layer and the second bulletproof layer are integrally bonded through an adhesive, and the adhesive is any one of liquid epoxy resin or polycarbonate resin. The polyimide fiber bulletproof impact-resistant composite board provided by the application does not contain a ceramic bulletproof layer, can avoid secondary injury caused by ceramic fragments, has good bulletproof impact-resistant performance, and has a simpler layer structure, lighter quality and more convenient use.

Description

Technical Field

[0001] This application belongs to the field of armor protection plate technology, and more specifically, relates to a polyimide fiber bulletproof and impact-resistant composite plate and its preparation method. Background Technology

[0002] Bulletproof plates, as a common personal protective equipment, have evolved from the initial steel plates to the current ceramic composite bulletproof plates, which offer higher protection and are lighter in weight. Most current bulletproof plates utilize a ceramic-on-fiberboard composite method, or a composite plate with a metal surface layer and ceramic fibers embedded within. For example, Chinese patent CN205138327U discloses a composite structure bulletproof plate combining a metal plate with fiber fabric or prepreg, with a finished plate surface density of 50-80 kg / m³. 2 Metal bulletproof armor absorbs energy through plastic deformation, while ceramic bulletproof armor absorbs energy through ceramic fragmentation. Even after fragmentation, it retains significant kinetic energy, easily scratching clothing. Both have low flexural modulus of elasticity, resulting in poor cushioning and a high risk of secondary injury. Chinese patent CN208887480U discloses a basalt composite bulletproof plate. This plate has a complex structure, and the splicing of the ceramic fiber composite plate results in weak seams that are easily penetrated. When a bullet impacts the plate, it easily shatters, sending ceramic fragments flying. This not only reduces the plate's subsequent protective capabilities but also, under high-speed impact, the internal fibers deform, generating flying fragments that can injure personnel. Furthermore, the complex bonding between layers and the adhesives result in weak seams, making them prone to breakage upon impact. Summary of the Invention

[0003] The purpose of this application is to provide a polyimide fiber bulletproof and impact-resistant composite plate and its preparation method, so as to solve the technical problems of existing ceramic composite bulletproof plates being heavy, having a complex structure, and being prone to secondary damage from ceramic fragments.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, this application provides a polyimide fiber bulletproof and impact-resistant composite panel, comprising:

[0006] The central flow-guiding layer is made of polyimide high-strength and high-toughness unidirectional filament fabric;

[0007] A first bulletproof layer, layered on top of the central deflector layer; and

[0008] The second bulletproof layer is stacked on top of the central flow-guiding layer;

[0009] The central flow-guiding layer is sandwiched between the first bulletproof layer and the second bulletproof layer, and the first bulletproof layer and the second bulletproof layer are each made of polyimide plain weave fabric or polyimide needle-punched felt;

[0010] The central flow guiding layer, the first bulletproof layer, and the second bulletproof layer are bonded together by an adhesive, which is either liquid epoxy resin or polycarbonate resin.

[0011] Furthermore, the central flow guiding layer is composed of at least two layers of polyimide high-strength and high-toughness unidirectional filament fabric, and adjacent two layers of polyimide high-strength and high-toughness unidirectional filament fabric are bonded together by the adhesive.

[0012] Furthermore, the central flow guiding layer is composed of 2-5 layers of polyimide high-strength and high-toughness unidirectional filament fabric, and adjacent layers of polyimide high-strength and high-toughness unidirectional filament fabric are bonded together by the adhesive.

[0013] Furthermore, the first bulletproof layer consists of at least two layers of polyimide plain weave fabric, with adjacent layers of polyimide plain weave fabric bonded together by the adhesive.

[0014] Furthermore, the first bulletproof layer is made of polyimide needle-punched felt with a thickness of 1.5 mm or more.

[0015] Furthermore, the second bulletproof layer consists of at least two layers of polyimide plain weave fabric, with adjacent layers of polyimide plain weave fabric bonded together by the adhesive.

[0016] Furthermore, the second bulletproof layer is made of polyimide needle-punched felt with a thickness of 1.5 mm or more.

[0017] Furthermore, both the first and second bulletproof layers are made of polyimide needle-punched felt with a thickness of 1.5-6 mm.

[0018] Furthermore, both the first and second bulletproof layers have an outer decorative layer laminated on their surfaces.

[0019] Furthermore, the outer coating layer is any one of a polyurethane outer coating layer, a polyimide outer coating layer, or a polyetherimide outer coating layer.

[0020] Secondly, this application provides a method for preparing a polyimide fiber bulletproof and impact-resistant composite plate, comprising the following steps:

[0021] The second bulletproof layer, the central deflector layer, and the first bulletproof layer are stacked and laid flat in sequence.

[0022] The second bulletproof layer, the central flow guiding layer, and the first bulletproof layer are hot-pressed together using a resin impregnation and hot-pressing process to form a hot-pressed composite board; the resin impregnation and hot-pressing process uses liquid epoxy resin or polycarbonate resin as adhesive.

[0023] An outer decorative layer is formed on the surface of the hot-pressed composite board by spraying, printing, or laminating.

[0024] Compared with the prior art, this application has the following technical effects:

[0025] This application discloses a polyimide fiber bulletproof and impact-resistant composite panel. It uses a high-strength, high-toughness unidirectional polyimide filament fabric as the central guiding layer, and polyimide plain weave fabric or polyimide needle-punched felt layered on both sides of the high-strength, high-toughness unidirectional polyimide filament fabric as the bulletproof layer. This polyimide fiber bulletproof and impact-resistant composite panel does not contain a ceramic bulletproof layer, thus avoiding secondary injuries from ceramic fragments and exhibiting good bulletproof and impact-resistant performance. Furthermore, the layer structure of this polyimide fiber bulletproof and impact-resistant composite panel is simpler, and the panel density is 8-15 kg / m³. 2 It is lighter and easier to use.

[0026] This application discloses a polyimide fiber bulletproof and impact-resistant composite panel. By setting a high-strength, high-toughness unidirectional polyimide filament fabric as a central guiding layer between the first and second bulletproof layers, even if the first or second bulletproof layer is damaged, the central guiding layer can effectively distribute the cushioning force to all parts of the panel, playing a guiding and cushioning role. This provides sufficient cushioning to stop the movement of bullets and helps to retain them, further reducing the harm to the human body. In addition, the high-strength, high-toughness unidirectional polyimide filament fabric itself is lightweight, which allows it to maintain good adhesion to the first and second bulletproof layers even on uneven plain weave or pre-punched felt surfaces. The joints between adjacent layers are more firmly and stably bonded, making it less prone to damage during impact.

[0027] The present application discloses a polyimide fiber bulletproof and impact-resistant composite board, which uses polyimide as the main material. Its tensile strength is 7-10 times that of ordinary steel, and its service life is long. In addition, the bulletproof composite board is non-combustible, temperature resistant, has good heat insulation and excellent insulation performance. It does not melt or drip when burning, and it will not burn even if the board reaches a high temperature for a moment, thus ensuring safety in use.

[0028] The layers of the polyimide fiber bulletproof and impact-resistant composite board of this application are bonded together by liquid epoxy resin or polycarbonate resin, which increases the bonding strength and toughness between the layers. The combination of liquid epoxy resin or polycarbonate resin and polyimide fiber fabric has a stable structure, high rigidity and no deformation of the finished product, stable solid content, the highest strength-to-weight ratio, and can withstand a static pressure of 60 tons per square meter.

[0029] The preparation method of the polyimide fiber bulletproof and impact-resistant composite board of this application is simple, and no toxic gas is emitted during the preparation process, making the preparation method green and environmentally friendly. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a polyimide fiber bulletproof and impact-resistant composite panel provided in an embodiment of this application.

[0032] The following are the labeling elements in the figure:

[0033] 1. Central airflow layer; 2. First bulletproof layer; 3. Second bulletproof layer; 4. Outer trim layer. Detailed Implementation

[0034] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0036] It should be understood that the terms "length", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," "third," "fourth," or "fifth" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] A first aspect of this application provides a polyimide fiber bulletproof and impact-resistant composite panel, the structure of which is as follows: Figure 1 As shown.

[0039] In one embodiment of this application, a polyimide fiber bulletproof and impact-resistant composite panel includes a central guiding layer 1, a first bulletproof layer 2, and a second bulletproof layer 3. The central guiding layer 1 is made of high-strength and high-toughness polyimide filament unidirectional fabric. The first bulletproof layer 2 is stacked on the central guiding layer 1, and the second bulletproof layer 3 is stacked on the central guiding layer 1. The central guiding layer 1 is sandwiched between the first bulletproof layer 2 and the second bulletproof layer 3. The first bulletproof layer 2 and the second bulletproof layer 3 are each made of polyimide plain weave fabric or polyimide needle-punched felt. The central guiding layer 1, the first bulletproof layer 2, and the second bulletproof layer 3 are bonded together by an adhesive, which is any one of liquid epoxy resin or polycarbonate resin.

[0040] The polyimide high-strength and high-toughness unidirectional fabric in this application embodiment is a high-strength and high-toughness unidirectional fabric, model ASPI091, with a fineness of 300-900 dtex; the polyimide plain weave fabric is a twisted filament woven plain weave fabric, model T800-T1300; the polyimide needle-punched felt (needle-punched felt) model ASP017 has a weight of 850 g / m². 2 All were provided by Jiangsu Aoshen New Materials Co., Ltd.

[0041] In this embodiment, the central guiding layer 1, the first bulletproof layer 2, and the second bulletproof layer 3 are bonded together using an adhesive. Liquid epoxy resin or polycarbonate resin can be used as the adhesive. For example, Ashy2040 liquid colorless epoxy resin with a curing agent is selected. The epoxy resin viscosity is 15 mPas, the flexural modulus is 4 GPa, and the elongation at break is 150%. The curing agent is either colorless or colored, with a viscosity of 10 mPas and a solid content of 99%. The polycarbonate resin has a tensile strength of 240 MPa, a tensile elongation of 8%, a flexural strength of 330 MPa, and flexural and tensile moduli of 17.7 GPa. The adhesive ensures a strong and stable bond between the composite layers, and no toxic gases are emitted during the manufacturing process of the bulletproof composite plate, which helps to improve the overall strength of the bulletproof composite plate and give it better bulletproof and impact resistance.

[0042] This application provides a polyimide fiber bulletproof and impact-resistant composite panel. It uses a high-strength, high-toughness unidirectional polyimide filament fabric as the central guiding layer 1, and polyimide plain weave fabric or polyimide needle-punched felt layered on both sides of the high-strength, high-toughness unidirectional polyimide filament fabric as the bulletproof layer. This application's polyimide fiber bulletproof and impact-resistant composite panel does not contain a ceramic bulletproof layer, thus avoiding secondary injuries from ceramic fragments and exhibiting good bulletproof and impact-resistant performance. Furthermore, the layer structure of this application's polyimide fiber bulletproof and impact-resistant composite panel is simpler, and the panel density is 8-15 kg / m³. 2 It is lighter and easier to use.

[0043] An embodiment of this application discloses a polyimide fiber bulletproof and impact-resistant composite board. By setting a high-strength and high-toughness polyimide unidirectional filament fabric as a central guiding layer 1 between the first bulletproof layer 2 and the second bulletproof layer 3, even if the first bulletproof layer 2 or the second bulletproof layer 3 is damaged, the central guiding layer 1 can effectively distribute the buffering force to all parts of the board, playing a guiding and buffering role. This provides sufficient buffer to stop the movement of bullets and helps to retain bullets, further reducing the harm to the human body. In addition, the high-strength and high-toughness polyimide unidirectional filament fabric itself is lightweight, which allows it to maintain a good adhesion effect with the first bulletproof layer 2 and the second bulletproof layer 3 even on uneven plain weave fabric or pre-punched felt surfaces. The joints between adjacent layers are more firmly and stably bonded, making it less prone to damage during impact.

[0044] The bulletproof and impact-resistant composite board of this application uses polyimide material as the main material. Its tensile strength is 7-10 times that of ordinary steel and its service life is long. Moreover, the bulletproof composite board is non-flammable, temperature resistant, has good heat insulation and excellent insulation performance. It does not melt or drip when burning. Even if the board reaches a high temperature for a moment, it will not burn, thus ensuring safety in use.

[0045] In this embodiment of the invention, a polyimide fiber bulletproof and impact-resistant composite board is bonded between layers using liquid epoxy resin or polycarbonate resin, which increases the bonding strength and toughness between layers. The combination of liquid epoxy resin or polycarbonate resin and polyimide fiber fabric has a stable structure, high rigidity, no deformation of the finished product, stable solid content, the highest strength-to-weight ratio, and can withstand a static pressure of 60 tons per square meter.

[0046] In one embodiment, the central flow guiding layer 1 of this application embodiment is composed of at least two layers of high-strength, high-toughness polyimide unidirectional fabric, with adjacent layers bonded together using adhesive. Furthermore, the central flow guiding layer 1 is composed of 2-5 layers of high-strength, high-toughness polyimide unidirectional fabric, with adjacent layers bonded together using adhesive. By providing multiple layers of high-strength, high-toughness polyimide unidirectional fabric, a better flow guiding and buffering effect is achieved, providing sufficient cushioning to stop the movement of the bullet and reducing the harm caused to the human body.

[0047] In one embodiment, the first bulletproof layer 2 of this application embodiment is composed of at least two layers of polyimide plain weave fabric, with adjacent layers of polyimide plain weave fabric bonded together by adhesive. Further, the second bulletproof layer 3 is composed of at least two layers of polyimide plain weave fabric, with adjacent layers of polyimide plain weave fabric bonded together by adhesive. In this application embodiment, the first bulletproof layer 2 and the second bulletproof layer 3 are symmetrically arranged on the upper and lower sides of the central flow-guiding layer 1, and the size of the central flow-guiding layer 1 is consistent with the size of the first bulletproof layer 2 and the second bulletproof layer 3, that is, the length and width are consistent.

[0048] In another embodiment, the first bulletproof layer 1 of this application is made of polyimide needle-punched felt with a thickness of 1.5 mm or more. Further, the second bulletproof layer 2 is made of polyimide needle-punched felt with a thickness of 1.5 mm or more. Even further, both the first bulletproof layer 1 and the second bulletproof layer 2 are made of polyimide needle-punched felt with a thickness of 1.5-6 mm.

[0049] In this embodiment, the first bulletproof layer 1 and the second bulletproof layer 2 can be composed of either polyimide plain weave fabric or polyimide needle-punched felt, or different types of polyimide materials can be selected. For example, the first bulletproof layer 1 is composed of polyimide plain weave fabric, and the second bulletproof layer 2 is composed of polyimide needle-punched felt.

[0050] Polyimide plain weave fabric or polyimide needle-punched felt has high strength and can effectively prevent bullet impact from breaking or penetrating, thus providing good bulletproof protection.

[0051] In another embodiment, both the first bulletproof layer 2 and the second bulletproof layer 3 of this application have an outer decorative layer 4 laminated on their surfaces. Further, the outer decorative layer 4 is any one of a polyurethane (TPU) outer decorative layer, a polyimide (TPI) outer decorative layer, or a polyetherimide (PEI) outer decorative layer. By providing the outer decorative layer 4, not only is the surface of the composite board smooth and aesthetically pleasing, and it provides cold resistance and heat insulation, but it also offers a certain degree of protection for the board material.

[0052] A second aspect of this application provides a method for preparing a polyimide fiber bulletproof and impact-resistant composite panel, comprising the following steps:

[0053] (1) The second bulletproof layer 3, the central flow-guiding layer 1 and the first bulletproof layer 2 are stacked and laid flat in sequence;

[0054] (2) The second bulletproof layer 3, the central guide layer 1, and the first bulletproof layer 2 are hot-pressed together using a hot-pressing process (RTM process) to form a hot-pressed composite plate. Liquid epoxy resin or polycarbonate resin is used as the adhesive in the RTM process. During the RTM process, the mold closing speed is 3-8 seconds, the injection rate is 50-200 ml / min, and the temperature is increased to 120℃ at a rate of 0.5-3℃ / min, held for 60 minutes, and then cooled for curing. The mold opening speed is the same as the mold closing speed. The mixed adhesive is connected to the ATM or VARI equipment through a guide tube. By controlling parameters such as the impregnation speed and the temperature of the impregnation tube, the polyimide fabric is impregnated and injected into the mold cavity. Finally, a hot-pressing molding machine is used to complete the curing process, with a pressure set at 8-12 MPa or 6-12 kg / m³. 2 This yields a hot-pressed composite board.

[0055] (3) An outer decorative layer 4 is formed on the surface of the hot-pressed composite board by spraying, printing or laminating, and the surface coating amount of the outer decorative layer 4 is 80-160g / m². 2 It is made into a polyimide fiber bulletproof and impact-resistant composite board.

[0056] In the polyimide fiber bulletproof and impact-resistant composite panel prepared in this application embodiment, the mass of the central guiding layer 1 accounts for 3-5% of the total mass of the polyimide fiber bulletproof and impact-resistant composite panel, the mass of the first bulletproof layer 2 and the second bulletproof layer 3 accounts for 55-75% of the total mass of the polyimide fiber bulletproof and impact-resistant composite panel, the mass of the outer decorative layer 4 accounts for 5-15% of the total mass of the polyimide fiber bulletproof and impact-resistant composite panel, and the mass of the adhesive accounts for 15-35% of the total mass of the polyimide fiber bulletproof and impact-resistant composite panel.

[0057] The preparation method of the polyimide fiber bulletproof and impact-resistant composite board of this application embodiment is simple, and no toxic gas is emitted during the preparation process, making the preparation method green and environmentally friendly.

[0058] The following specific embodiments illustrate a polyimide fiber bulletproof and impact-resistant composite board and its preparation method according to the present application.

[0059] Example 1

[0060] Example 1 of this application provides a polyimide fiber bulletproof and impact-resistant composite board and its preparation method, including the following steps:

[0061] (1) Spray release agent 770NC inside the upper and lower molds and attach PTFE release cloth F4T09. The release agent spray thickness is 0.1-0.5mm and the volatilization time is 5-10min. Use a fiber cutting machine to cut polyimide plain weave cloth T800 and polyimide high-strength and high-toughness unidirectional filament cloth ASPI091 (fiber fineness is 800dtex) to the required size. Lay the cut polyimide plain weave cloth and polyimide high-strength and high-toughness unidirectional filament cloth flat in the mold. The polyimide high-strength and high-toughness unidirectional filament cloth has 2 layers. Lay 3 layers of polyimide plain weave cloth on the upper and lower sides of the polyimide high-strength and high-toughness unidirectional filament cloth.

[0062] (2) Stir the epoxy resin and curing agent separately in storage tanks to ensure uniform dispersion. The stirring time is 10-20 minutes, and the stirring speed is 30-50 rpm. Defoaming is achieved by vacuuming the epoxy resin and curing agent in the storage tanks. The vacuum pressure is 0.8 MPa. The epoxy resin and curing agent are mixed according to the specified ratio through a conveying pipe by pressing. The mixed resin is then injected into the mold cavity via a guide pipe connected to an ATM device. Finally, hot-pressing is performed using a molding press to complete the curing process. The pressure is set to 8 MPa to obtain the hot-pressed composite board. In the impregnation and hot-pressing process, the mold closing speed is 3-8 seconds, the injection rate is 50 ml / min, the temperature is increased to 120°C at 0.5°C / min, held for 60 minutes, and then decreased to 60°C at 1°C / min before mold opening. The mold opening speed is the same as the mold closing speed.

[0063] (3) A TPU outer coating is formed on the surface of the hot-pressed composite board by a grinding head spraying method, with a surface coating amount of 80g / m². 2 After processing and shaping, a polyimide fiber bulletproof and impact-resistant composite board is obtained.

[0064] Example 2

[0065] Example 2 of this application provides a polyimide fiber bulletproof and impact-resistant composite board and its preparation method, including the following steps:

[0066] (1) Spray release agent 770NC inside the upper and lower molds and attach PTFE release cloth F4T09. The release agent spray thickness is 0.1-0.5mm and the volatilization time is 5-10min. Use a fiber cutting machine to cut polyimide plain weave cloth T800 and polyimide high strength and high toughness filament unidirectional cloth ASPI091 (fiber fineness is 800dtex) to the required size. Lay the cut polyimide plain weave cloth and polyimide high strength and high toughness filament unidirectional cloth flat in the mold. The polyimide high strength and high toughness filament unidirectional cloth has 3 layers. Lay 3 layers of polyimide plain weave cloth on the upper and lower sides of the polyimide high strength and high toughness filament unidirectional cloth.

[0067] (2) Stir the epoxy resin and curing agent separately in storage tanks to ensure uniform dispersion. The stirring time is 10-20 minutes, and the stirring speed is 30-50 rpm. Defoaming is achieved by vacuuming the epoxy resin and curing agent in the storage tanks. The vacuum pressure is 0.8 MPa. The epoxy resin and curing agent are mixed according to the specified ratio through a conveying pipe by pressing. The mixed resin is then injected into the mold cavity via a guide pipe connected to an ATM device. Finally, hot pressing is performed using a molding press to complete the curing process. The pressure is set to 9 MPa to obtain the hot-pressed composite board. In the impregnation and hot pressing process, the mold closing speed is 3-8 seconds, the injection rate is 100 ml / min, the temperature is increased to 120℃ at 1.5℃ / min, held for 60 minutes, and then decreased to 60℃ at 2℃ / min before mold opening. The mold opening speed is the same as the mold closing speed.

[0068] (3) A TPI outer coating is formed on the surface of the hot-pressed composite plate by a grinding head spraying method, and the surface coating amount of the outer coating is 100g / m². 2 After processing and shaping, a polyimide fiber bulletproof and impact-resistant composite board is obtained.

[0069] Example 3

[0070] Example 3 of this application provides a polyimide fiber bulletproof and impact-resistant composite board and its preparation method, including the following steps:

[0071] (1) Spray release agent 770NC inside the upper and lower molds and attach nylon 66 release cloth NSPA66. The release agent spray thickness is 0.1-0.5mm and the evaporation time is 5-10min. Use a fiber cutting machine to cut polyimide plain weave cloth T800 and polyimide high strength and high toughness long filament unidirectional cloth ASPI091 (fiber fineness is 800dtex) to the required size. Lay the cut polyimide plain weave cloth and polyimide high strength and high toughness long filament unidirectional cloth flat in the mold. The polyimide high strength and high toughness long filament unidirectional cloth has 5 layers. Lay 5 layers of polyimide plain weave cloth on the upper and lower sides of the polyimide high strength and high toughness long filament unidirectional cloth.

[0072] (2) The molten polycarbonate resin and curing agent are stirred separately in storage tanks to ensure uniform dispersion. The stirring time for the polycarbonate resin and curing agent in the storage tanks is 10-20 min, and the stirring speed is 30-50 rpm. When the viscosity of the polycarbonate resin is ≤6 Pa·s, it is kept at 60-80℃ through the conveying pipe. The polycarbonate resin and curing agent in the storage tank are defoamed by vacuuming. The negative pressure value of the vacuum is 1.6 MPa. The polycarbonate resin and curing agent are mixed in proportion through the conveying pipe by stamping. The mixed resin is connected to the ATM equipment through the guide pipe and injected into the mold cavity. Finally, the hot pressing composite is completed by molding machine with a pressure set at 10 MPa to obtain the hot-pressed composite board. In the impregnation hot pressing process, the mold closing speed is 3-8 s, the injection rate is 150 ml / min, the temperature is increased to 120℃ at 3℃ / min, held for 60 min, and then cooled to 60℃ at 2℃ / min before mold opening. The mold opening speed is the same as the mold closing speed.

[0073] (3) A PEI outer coating is formed on the surface of the hot-pressed composite board by a grinding head spraying method, with a surface coating amount of 120g / m². 2 After processing and shaping, a polyimide fiber bulletproof and impact-resistant composite board is obtained.

[0074] Example 4

[0075] Example 4 of this application provides a polyimide fiber bulletproof and impact-resistant composite board and its preparation method, including the following steps:

[0076] (1) Spray release agent 770NC inside the upper and lower molds and attach nylon 66 release cloth NSPA66. The release agent spray thickness is 0.1-0.5mm and the evaporation time is 5-10min. Use a fiber cutting machine to cut polyimide needle-punched felt ASP017 and polyimide high-strength and high-toughness unidirectional filament cloth ASPI091 (fiber fineness is 800dtex) to the required size. Lay the cut polyimide needle-punched felt and polyimide high-strength and high-toughness unidirectional filament cloth flat in the mold. The polyimide high-strength and high-toughness unidirectional filament cloth has 5 layers. Lay polyimide needle-punched felt with a thickness of 5mm on both the upper and lower sides of the polyimide high-strength and high-toughness unidirectional filament cloth.

[0077] (2) The molten polycarbonate resin and curing agent are stirred separately in storage tanks to ensure uniform dispersion. The stirring time for the polycarbonate resin and curing agent in the storage tanks is 10-20 min, and the stirring speed is 30-50 rpm. When the viscosity of the polycarbonate resin is ≤6 Pa·s, it is kept at 60-80℃ through the conveying pipe. The polycarbonate resin and curing agent in the storage tank are defoamed by vacuuming. The negative pressure value of the vacuum is 1.6 MPa. The polycarbonate resin and curing agent are mixed in proportion through the conveying pipe by stamping. The mixed resin is connected to the ATM equipment through the guide pipe and injected into the mold cavity. Finally, the hot pressing composite is completed by molding machine with a pressure set at 10 MPa to obtain the hot-pressed composite board. In the impregnation hot pressing process, the mold closing speed is 3-8 s, the injection rate is 150 ml / min, the temperature is increased to 120℃ at 3℃ / min, held for 60 min, and then cooled to 60℃ at 2℃ / min before mold opening. The mold opening speed is the same as the mold closing speed.

[0078] (3) A PEI outer coating is formed on the surface of the hot-pressed composite board by a grinding head spraying method, with a surface coating amount of 120g / m². 2 After processing and shaping, a polyimide fiber bulletproof and impact-resistant composite board is obtained.

[0079] The physical properties of the polyimide fiber bulletproof and impact-resistant composite panels prepared in Examples 1-4 of this application were tested, and the test results are shown in the table below.

[0080]

[0081]

[0082] As shown in the table above, the surface density of the polyimide fiber bulletproof and impact-resistant composite board prepared in the embodiments of this application is 8-15 kg / m³. 2 It has a lower areal density than conventional ceramic composite bulletproof plates (50-80 kg / m³). 2 It is lighter and easier to use.

[0083] Furthermore, the flexural modulus of the polyimide fiber bulletproof and impact-resistant composite plate prepared in this application embodiment is above 400 GPa, the maximum flexural strength reaches 574 MPa, and the tensile strength reaches 990 MPa, while the flexural modulus of conventional ceramic composite bulletproof plates is around 440 MPa. This indicates that the bulletproof and impact-resistant performance of the polyimide fiber bulletproof and impact-resistant composite plate prepared in this application embodiment is superior to that of conventional ceramic composite bulletproof plates.

[0084] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for preparing a polyimide fiber bulletproof and impact-resistant composite panel, characterized in that, The polyimide fiber bulletproof and impact-resistant composite plate includes a central drainage layer, which is made of unidirectional fabric composed of high-strength and high-toughness polyimide filaments with a fineness of 300-900 dtex, and the fiber density of the central drainage layer is 200-500 g / m². 2 ; A first bulletproof layer, layered on top of the central deflector layer; and The second bulletproof layer is stacked on the central flow-guiding layer; The central flow guiding layer is sandwiched between the first bulletproof layer and the second bulletproof layer. The first bulletproof layer and the second bulletproof layer are each made of twisted polyimide filament woven plain fabric or polyimide needle-punched felt with a weight of 850 g / m². The model of the polyimide filament woven plain fabric is T800-T1300. The central flow guiding layer, the first bulletproof layer, and the second bulletproof layer are bonded together by an adhesive, which is either liquid epoxy resin or polycarbonate resin; an outer decorative layer is laminated on the surface of both the first bulletproof layer and the second bulletproof layer; the outer decorative layer is either a polyurethane outer decorative layer, a polyimide outer decorative layer, or a polyetherimide outer decorative layer. The preparation method of the polyimide fiber bulletproof and impact-resistant composite board includes the following steps: The second bulletproof layer, the central deflector layer, and the first bulletproof layer are stacked and laid flat in sequence; The second bulletproof layer, the central flow guiding layer, and the first bulletproof layer are hot-pressed together using a resin impregnation and hot pressing process to form a hot-pressed composite plate. The resin impregnation and hot pressing process is an RTM process, with a mold closing speed of 3-8 s, a resin injection rate of 50-200 ml / min, a heating rate of 0.5-3 ℃ / min to 120 ℃, a holding temperature of 60 min, and then cooling and curing. An outer decorative layer is formed on the surface of the hot-pressed composite board by spraying, printing or laminating, and the surface spraying amount of the outer decorative layer is 80-160 g / m². The mass of the central flow guiding layer accounts for 3-5% of the total mass of the composite panel, the mass of the first bulletproof layer and the second bulletproof layer together accounts for 55-75%, the mass of the adhesive accounts for 15-35%, and the mass of the outer decorative layer accounts for 5-15%.

2. The polyimide fiber bulletproof and impact-resistant composite board as described in claim 1, characterized in that, The central flow guiding layer is composed of at least two layers of polyimide high-strength and high-toughness unidirectional filament fabric, and adjacent two layers of polyimide high-strength and high-toughness unidirectional filament fabric are bonded together by the adhesive.

3. The polyimide fiber bulletproof and impact-resistant composite board as described in claim 2, characterized in that, The central flow guiding layer is composed of 2-5 layers of polyimide high-strength and high-toughness unidirectional filament fabric, and adjacent layers of polyimide high-strength and high-toughness unidirectional filament fabric are bonded together by the adhesive.

4. The polyimide fiber bulletproof and impact-resistant composite board as described in claim 3, characterized in that, The first bulletproof layer is composed of at least two layers of polyimide plain weave fabric, with adjacent layers of polyimide plain weave fabric bonded together by the adhesive; or the first bulletproof layer is made of polyimide needle-punched felt with a thickness of 1.5 mm or more.

5. The polyimide fiber bulletproof and impact-resistant composite board as described in claim 4, characterized in that, The second bulletproof layer consists of at least two layers of polyimide plain weave fabric, with adjacent layers of polyimide plain weave fabric bonded together by the adhesive.

6. The polyimide fiber bulletproof and impact-resistant composite board as described in claim 4, characterized in that, The second bulletproof layer is made of polyimide needle-punched felt with a thickness of 1.5 mm or more.

7. The polyimide fiber bulletproof and impact-resistant composite board as described in claim 1, characterized in that, The first and second bulletproof layers are each made of polyimide needle-punched felt with a thickness of 1.5-6 mm.

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