Multifunctional protective shield and manufacturing method thereof

Abstract

The invention belongs to the technical field of shield preparation, and particularly relates to a multifunctional protective shield and a manufacturing method thereof.The multifunctional protective shield comprises an ultra-high molecular weight polyethylene protective layer B, an ultra-high molecular weight polyethylene protective layer A, a hot melt adhesive film B, foamed aluminum, a hot melt adhesive film A and a metal layer which are arranged in sequence. The infrared stealth function is achieved, the impact of impact waves can be resisted, and acid, alkali and corrosion are resisted.

Description

Technical Field

[0001] The invention belongs to the technical field of shield preparation, and in particular relates to a multifunctional protective shield and a manufacturing method thereof. Background Art

[0002] Shield materials mainly include wood, leather, metal (copper, iron), polycarbonate, super-strong polyethylene, aramid, etc. Modern shield materials are more diverse, including polycarbonate, super-strong polyethylene, aramid, etc., and the protection requirements for shields are higher. For example, array-type riot shields are made of polycarbonate sheets, which are resistant to chemical corrosion and have the ability to block the impact of general objects. Handheld bulletproof shields are made of super-strong fiber materials such as super-strong polyethylene materials and aramid materials, as well as high-strength flame-retardant fiberglass, which are light and flexible, and have good comprehensive bulletproof performance.

[0003] Shields made of different materials and structures have different key protection requirements. If they are to meet multiple different protection requirements, they may not be able to meet the lightweight requirements in terms of weight performance. When current users face violence or danger protection, on the one hand, they are not clear about the source of the danger or what kind of danger it is. On the other hand, it is also difficult to determine the level of danger. Therefore, a protective shield that can meet relatively high requirements in various protections is needed.

[0004] Ultra-high molecular weight polyethylene is a common material for making shields. CN112414220A discloses a foldable integrated protective shield, comprising: two or more protective plates arranged inside a flexible outer layer according to a set rule, the two or more protective plates are connected to the flexible outer layer to form a whole; there are gaps between adjacent protective plates as creases, so that the protective shield can be folded along the creases and then stored; the protective plate comprises two or more composite plates stacked in sequence, each composite plate has a heat-insulating flame-retardant layer and a bullet-proof layer; the flexible outer layer has a heat-insulating flame-retardant layer and a flexible bullet-proof layer.

[0005] CN109443093A discloses a multi-layer bulletproof component and its preparation method and application. The bulletproof component includes a metal / ceramic crack-stopping reflective layer, a fiber / elastomer composite energy-absorbing layer and a two-dimensional fabric blunt injury protection layer; the three-layer structure is stacked in sequence. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a multifunctional protective shield and a manufacturing method thereof, which has bulletproof performance, can resist fragments, chop and impact, has infrared stealth function, can resist the impact of shock waves, and is acid, alkali and corrosion resistant.

[0007] An embodiment of the present invention provides a multifunctional protective shield, comprising an ultra-high molecular weight polyethylene protective layer B, an ultra-high molecular weight polyethylene protective layer A, a hot melt adhesive film B, foamed aluminum, a hot melt adhesive film A and a metal layer which are arranged in sequence.

[0008] Preferably, the material of the metal layer is aluminum alloy, titanium alloy or special steel.

[0009] Preferably, the thickness of the metal layer is 2-3 mm, and the thickness of the foamed aluminum is 5 mm.

[0010] Preferably, a coating is provided on the surface of the metal layer, and the material of the coating includes aluminum powder and a binder.

[0011] Preferably, the coating has a thickness of 20-30 μm.

[0012] Preferably, the ultra-high molecular weight polyethylene protective layer B is made of non-woven fabric, and the surface density of the non-woven fabric is 115-125g / m 2 The structure is two layers, the angle is 0 / 90, and the number of layers is 38; the ultra-high molecular weight polyethylene protective layer A is made of non-woven fabric, and the surface density of the non-woven fabric is 145-155g / m 2 The structure is 4 layers, the angles are 0 / 45 / 90 / 135, and the number of layers is 30.

[0013] The embodiment of the present invention provides a method for manufacturing the multifunctional protective shield, wherein the ultra-high molecular weight polyethylene protective layer B, the ultra-high molecular weight polyethylene protective layer A, the hot melt adhesive film B, the foamed aluminum, the hot melt adhesive film A and the metal layer which are arranged in sequence are evacuated, placed in an autoclave for pressurized heating to obtain a shield body, and then a coating is applied on the shield body, and finally, paint is sprayed and accessories are installed to obtain a multifunctional protective shield.

[0014] Preferably, the steps of pressurizing and heating in the autoclave are: 0-30 min, controlling the pressure to 1 MPa and the temperature to 75-80°C; 31-45 min, maintaining the temperature and pressure for 15 minutes; 46-60 min, controlling the negative pressure to 1.6 MPa and the temperature to 95-105°C; 61-120 min, maintaining the temperature and pressure for 60 minutes; 121-180 min, releasing the pressure and lowering the temperature to room temperature.

[0015] Preferably, the coating material of the coating is a binder and aluminum powder, and the binder is an epoxy resin or a phenolic resin.

[0016] Preferably, the mass fraction of aluminum powder is 30-40%.

[0017] The beneficial effect of the present invention is that the present invention adopts two ultra-high molecular weight polyethylene protective layers as the base layer, and then foam aluminum and a metal layer are arranged thereon in sequence, and finally a coating is applied on the metal layer. The prepared shield has multiple good properties, and at the same time has bulletproof performance, can resist fragments, chop and impact, has infrared stealth function, can resist the impact of shock waves, is acid-resistant, alkali-resistant and corrosion-resistant, and can meet multi-functional requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the shield main body of the present invention.

[0019] In the figure, 1 is ultra-high molecular weight polyethylene protective layer B, 2 is ultra-high molecular weight polyethylene protective layer A, 3 is hot melt adhesive film B, 4 is foamed aluminum, 5 is hot melt adhesive film A, and 6 is metal layer. DETAILED DESCRIPTION

[0020] Example 1 A method for manufacturing the multifunctional protective shield, 1) Preparation of ultra-high molecular weight polyethylene protective layer B and ultra-high molecular weight polyethylene protective layer A Select ultra-high molecular weight polyethylene non-woven fabric and spread it on the workbench. The fabric should be spread evenly and each layer should overlap. Use the special version software for clothing design to automatically layout and cut according to the size of the bulletproof insert. The cut pieces are transported to the weight-balancing room in time for weight-balancing. The total surface density is 9kg / m 2 , the control range is 8.8-9.2kg / m 2 .

[0021] The ultra-high molecular weight polyethylene protective layer B is made of non-woven fabric with a surface density of 120g / m 2 The structure is two-layer, the angle is 0 / 90, and the number of layers is 38.

[0022] The ultra-high molecular weight polyethylene protective layer A is made of non-woven fabric with a surface density of 150g / m 2 The structure is 4 layers, the angles are 0 / 45 / 90 / 135, and the number of layers is 30.

[0023] Then, pressing is performed according to a set pressing process to obtain an ultra-high molecular weight polyethylene protective layer B and an ultra-high molecular weight polyethylene protective layer A.

[0024] 2) The ultra-high molecular weight polyethylene protective layer B1, the ultra-high molecular weight polyethylene protective layer A2, the hot melt adhesive film B3, the foamed aluminum 4, the hot melt adhesive film A5 and the metal layer 6 which are arranged in sequence are evacuated, and are placed in an autoclave for pressurization and heating to obtain a shield body. The pressurization and heating method is as follows: The steps of pressurizing and heating in the autoclave are: 0-30min, control the pressure to 1 MPa and the temperature to 75-80°C; 31-45min, maintain the temperature and pressure for 15 minutes; 46-60min, control the negative pressure to 1.6 MPa and the temperature to 95-105°C; 61-120min, maintain the temperature and pressure for 60 minutes; 121-180min, release the pressure and reduce the temperature to room temperature.

[0025] The material of the metal layer is aluminum alloy, titanium alloy or special steel. The thickness of the metal layer is 2-3 mm, and the thickness of the foamed aluminum is 5 mm.

[0026] 3) Coating treatment. The shield body is subjected to surface coating treatment. First, the metal layer surface is polished, then the coating agent is applied to the metal layer surface, and it is smoothed with a coating roller, and finally left to stand at room temperature for 24 hours. The filler of the coating is aluminum powder, the mass fraction of aluminum powder is 30-40%, the binder is epoxy resin or phenolic resin, and the coating thickness is 20-30μm.

[0027] 4) Painting and accessories installation Preparation: Start spraying after heating to 70℃. Use a nozzle diameter of 1.2mm and a spraying distance of 550-630mm. Spray the product surface evenly and let it air dry for 5.5 hours.

[0028] Install bulletproof glass at the window position, install accessories such as handles at the corresponding positions, then apply coating on the shield body, and finally spray paint and install accessories to obtain a multifunctional protective shield.

[0029] The multifunctional protective shield prepared by this method has excellent protective performance. It can resist bullets and meet the GA423-2015 "Police Bulletproof Shield" standard level 3, resist fragments and meet the 1.1g fragment V50 value ≥ 700m / s, and resist slashing and impact and meet 422-2008 "Police Riot Shield". It has infrared stealth function, an emissivity of 0.41, can resist the impact of 70-100kpa shock waves, and has strong environmental adaptability (acid, alkali and corrosion resistance).

[0030] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0031] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A multifunctional protective shield, characterized in that: It comprises an ultra-high molecular weight polyethylene protective layer B, an ultra-high molecular weight polyethylene protective layer A, a hot melt adhesive film B, foamed aluminum, a hot melt adhesive film A and a metal layer which are arranged in sequence.

2. The multifunctional protective shield according to claim 1, characterized in that: The material of the metal layer is aluminum alloy, titanium alloy or special steel.

3. The multifunctional protective shield according to claim 1, characterized in that: The thickness of the metal layer is 2-3 mm, and the thickness of the foamed aluminum is 5 mm.

4. The multifunctional protective shield according to claim 1, characterized in that: The surface of the metal layer is provided with a coating, and the material of the coating comprises aluminum powder and a binder.

5. The multifunctional protective shield according to claim 4, characterized in that: The thickness of the coating is 20-30 μm.

6. The multifunctional protective shield according to any one of claims 1 to 5, characterized in that: The ultra-high molecular weight polyethylene protective layer B is made of non-woven fabric, and the surface density of the non-woven fabric is 115-125g / m 2 The structure is two layers, the angle is 0 / 90, and the number of layers is 38; the ultra-high molecular weight polyethylene protective layer A is made of non-woven fabric, and the surface density of the non-woven fabric is 145-155g / m 2 The structure is 4 layers, the angles are 0 / 45 / 90 / 135, and the number of layers is 30.

7. A method for manufacturing a multifunctional protective shield according to any one of claims 1 to 6, characterized in that: The ultra-high molecular weight polyethylene protective layer B, ultra-high molecular weight polyethylene protective layer A, hot melt adhesive film B, foam aluminum, hot melt adhesive film A and metal layer which are arranged in sequence are evacuated, placed in an autoclave for pressurized heating to obtain a shield body, and then a coating is applied on the shield body, and finally, it is sprayed with paint and accessories are installed to obtain a multifunctional protective shield.

8. The method of claim 7, wherein: The steps of pressurizing and heating in the autoclave are: 0-30min, control the pressure to 1 MPa and the temperature to 75-80°C; 31-45min, maintain the temperature and pressure for 15 minutes; 46-60min, control the negative pressure to 1.6 MPa and the temperature to 95-105°C; 61-120min, maintain the temperature and pressure for 60 minutes; 121-180min, release the pressure and reduce the temperature to room temperature.

9. The method of claim 7, wherein: The coating material of the coating is a binder and aluminum powder, and the binder is epoxy resin or phenolic resin.

10. The method of claim 9, wherein: The mass fraction of aluminum powder is 30-40%.

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