Metal honeycomb plate with flame-retardant and heat-insulating functions

Abstract

The utility model discloses a flame-retardant heat preservation metal honeycomb plate which comprises an upper surface layer, a lower surface layer, an upper heat insulation layer, a lower heat insulation layer and a middle structure layer, the middle structure layer is arranged between the upper heat insulation layer and the lower heat insulation layer in a clamping mode, the middle structure layer is composed of a framework and a metal honeycomb core material, and the metal honeycomb core material is arranged in a cavity defined by the framework. The upper surface layer is arranged on the upper side of the upper heat insulation layer, the lower surface layer is arranged on the lower side of the lower heat insulation layer, and the upper surface layer, the upper heat insulation layer, the middle structure layer, the lower heat insulation layer and the lower surface layer are sequentially bonded through a flame-retardant adhesive; the upper surface layer and the lower surface layer are both thin-wall metal plates, and the upper heat insulation layer and the lower heat insulation layer are both phenolic foam plates. The heat conduction performance of the metal honeycomb plate is greatly reduced, the heat preservation performance is obviously improved, and the flame retardant effect is obviously improved.

Description

Technical Field

[0001] The utility model relates to the field of military and civilian cabins (compartment bodies) and composite sandwich panels, and in particular to a thermal insulation metal honeycomb panel with a flame retardant function. Background Art

[0002] Metal honeycomb panel is a sandwich structure composite sandwich panel that uses high-strength metal plates as the face plate and bottom plate, and then composites with a metal honeycomb core. It has the characteristics of light weight, high strength, high rigidity, stable performance, etc., and is widely used in various industries, especially in shelter technology as a cabin body panel. The surface layer of the metal honeycomb panel is a metal material, such as thin plates such as aluminum, steel, and stainless steel, and the metal honeycomb core is an aluminum honeycomb core, a stainless steel honeycomb core, etc. General metal honeycomb panels do not have thermal insulation properties. In order to improve the thermal insulation effect, the conventional practice is to fill the honeycomb core cells with foam. The foam material is generally phenolic foam with good thermal insulation and flame retardant properties. There are two filling methods. One is to fill the honeycomb cells with phenolic self-foaming, and the other is to press the low-density phenolic foam board directly into the honeycomb core cells through a press.

[0003] When the existing metal honeycomb panels are used for large panel structures of cabins (compartments), they have the following technical defects:

[0004] The method of filling metal honeycomb core with foam has limited insulation effect. Although the filling foam can prevent convective heat transfer in the honeycomb cells to a certain extent, it cannot prevent heat conduction through the honeycomb core pore walls. The latter has a greater impact than the former, which causes heat to be easily transferred from one side of the skin to the other side of the skin through the metal honeycomb core. The heat transfer rate inside and outside the cabin is fast, and the thermal insulation effect of the cabin is poor, resulting in a large operating load and high energy consumption for environmental control equipment such as air conditioners configured in the cabin. Utility Model Content

[0005] In order to solve the above problems, the utility model provides a metal honeycomb panel with flame retardant and heat-insulating functions.

[0006] The technical solution adopted by the utility model is:

[0007] A metal honeycomb panel with flame retardant and heat-insulating functions comprises an upper layer, a lower layer, an upper heat-insulating layer, a lower heat-insulating layer and an intermediate structural layer, wherein the intermediate structural layer is sandwiched between the upper heat-insulating layer and the lower heat-insulating layer, the intermediate structural layer is composed of a skeleton and a metal honeycomb core material, and the metal honeycomb core material is arranged in a cavity surrounded by the skeleton; the upper layer is arranged on the upper side of the upper heat-insulating layer, and the lower layer is arranged on the lower side of the lower heat-insulating layer, and the upper layer, the upper heat-insulating layer, the intermediate structural layer, the lower heat-insulating layer and the lower layer are sequentially bonded by a flame retardant adhesive; the upper layer and the lower layer are both thin-walled metal plates, and the upper heat-insulating layer and the lower heat-insulating layer are both phenolic foamed boards.

[0008] Furthermore, the thickness of the thin-walled metal plate is 0.8 mm to 1.5 mm.

[0009] Furthermore, the thickness of the phenolic foam board is 5 to 100 mm, and the density is 160 to 210 kg / m 3 , compressive strength>0.4MPa, thermal conductivity is 0.03~0.04W / mK.

[0010] Furthermore, the frame is a metal frame or a non-metal frame; the metal frame is made of a steel pipe or an aluminum profile; the non-metal frame is made of a carbon fiber tube, a glass fiber tube or a PU tube with a flame retardant grade of at least B2.

[0011] Furthermore, the thickness of the skeleton and the metal honeycomb core material is 10 to 200 mm.

[0012] Furthermore, the adhesive is epoxy adhesive, polyurethane adhesive, epoxy film or polyurethane film.

[0013] Beneficial effects of the utility model:

[0014] 1. The present application sets phenolic foaming plates on both sides of the middle layer as the heat insulation layer, and there is no need to fill the metal honeycomb core with phenolic foam. The thermal conductivity of air is 0.026W / (m·K), which is equivalent to phenolic foam. It can achieve the technical effect of effectively preventing the convective heat transfer in the honeycomb cells and the heat conduction of the honeycomb core pore walls, thereby greatly reducing the thermal conductivity of the metal honeycomb panel of the present application and significantly improving the thermal insulation performance. In addition, the phenolic foaming plate does not produce dripping, debris and smoke during the combustion process, and the flame retardant level is higher than B2, thereby significantly improving the flame retardant effect of the metal honeycomb panel of the present application.

[0015] 2. In addition, after the upper and lower insulation layers are combined, the overall compressive strength of the metal honeycomb panel is improved and the dimensional stability is improved.

[0016] 3. Since there is no need to fill the metal honeycomb core with phenolic foam, the manufacturing process is saved, the production efficiency is improved, and the manufacturing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the metal honeycomb panel of this application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and a preferred implementation manner.

[0019] See also Figure 1A flame retardant and heat-insulating metal honeycomb panel comprises an upper layer 10, a lower layer 50, an upper heat-insulating layer 20, a lower heat-insulating layer 40 and an intermediate structure layer 30, wherein the intermediate structure layer 30 is sandwiched between the upper heat-insulating layer 20 and the lower heat-insulating layer 40, and the intermediate structure layer 30 is composed of a skeleton 31 and a metal honeycomb core material 32, and the metal honeycomb core material 32 is arranged in a cavity enclosed by the skeleton 31; the upper layer 10 is arranged on the upper side of the upper heat-insulating layer 20, and the lower layer 50 is arranged on the lower side of the lower heat-insulating layer 40, and the upper layer 10, the upper heat-insulating layer 20, the intermediate structure layer 30, the lower heat-insulating layer 40 and the lower layer 50 are sequentially bonded by an adhesive 60; the upper layer 10 and the lower layer 50 are both thin-walled metal plates, and the upper heat-insulating layer 20 and the lower heat-insulating layer 40 are both phenolic foamed boards.

[0020] In specific implementation, the upper layer 10 and the lower layer 50 can be made of conventional aluminum plates, steel plates or stainless steel plates, and the thickness of the plates is selected within the range of 0.8 mm to 1.5 mm. If the thickness of the plates is less than 0.8 mm, the structural strength and dimensional stability will be affected, and if the thickness is too large, the manufacturing cost and the plate weight will be increased.

[0021] Preferably, the upper insulation layer 20 and the lower insulation layer 40 are both 5 to 100 mm thick, have a thermal conductivity of 0.03 to 0.04 W / mK, and a density of 160 to 210 kg / m 3 , phenolic foam board with compressive strength > 0.4MPa.

[0022] The structural design of the thermal insulation layer can achieve:

[0023] 1) Solve the heat insulation problem: The phenolic foam board with a thermal conductivity of 0.03-0.04W / mK and a thickness of ≥5mm has good heat insulation performance. After covering the upper and lower surfaces of the metal honeycomb core with the phenolic foam board, it can effectively isolate the heat from being transferred through the skin-metal honeycomb core hole wall-skin.

[0024] 2) Improve the flame retardancy of metal honeycomb panels: The thermal insulation layer abandons the polyurethane foam and PVC panels used in conventional cabin panels (although the flame retardancy of these two materials is B2, more smoke is generated during the combustion process and the temperature resistance is poor). Instead, phenolic foam panels with better flame retardancy are used. Phenolic foam panels do not produce dripping, debris or smoke during the combustion process, and the flame retardancy is higher than B2, so they can be used for environmental insulation with higher requirements.

[0025] 3) Improve the overall strength of metal honeycomb panels: The insulation board abandons the conventional low-density phenolic board (brittle texture), and instead adopts high-density, high-strength phenolic foam board with a density of 160-210kg / m 3, compressive strength>0.4MPa, it can play two roles, one is to prevent the honeycomb hole wall from embedding into the insulation board during the pressing and forming process of the metal honeycomb panel, effectively maintaining the dimensional stability of the large panel, and the other is to improve the overall compressive strength of the composite large panel.

[0026] The metal honeycomb core material 32 can be a conventional aluminum honeycomb core or a stainless steel honeycomb core. The thickness of the honeycomb core material is preferably 10 to 200 mm. A thickness below 10 mm affects its structural stability and strength, while a thickness that is too high increases the manufacturing cost and weight of the metal honeycomb panel. In specific implementation, the thickness, density and compressive strength can be determined based on the actual load-bearing capacity.

[0027] The frame 31 can be a metal frame or a non-metal frame. The metal frame is made of steel pipe or aluminum profile; the non-metal frame is made of carbon fiber tube, glass fiber tube or PU tube with a flame retardant grade of at least B2. In specific implementation, the structure and material of the frame can be determined according to the actual load-bearing capacity.

[0028] The adhesive 60 preferably adopts high-strength anti-sagging epoxy adhesive, polyurethane adhesive or epoxy film and polyurethane film. The modified epoxy adhesive, polyurethane adhesive or film has good flame retardant effect, strong bonding force, good corrosion resistance and weather resistance, and is suitable for the manufacture of large panels of shelters.

[0029] The thermal insulation performance of the metal honeycomb panel of the present application is tested below through specific samples.

[0030] Sample 1: Select the stainless steel skin with a size of 500mm×500mm and a thickness of 1.0mm as the upper and lower layers, and sandwich a 40mm thick foamed aluminum honeycomb core (filled with phenolic foam inside) between the upper and lower layers, without a heat insulation layer, and laminated with adhesive film. That is, the structure of sample 1 is stainless steel skin-aluminum honeycomb core-stainless steel skin.

[0031] Sample 2: Based on sample 1, add a layer of 8mm, 160kg / m 3 The phenolic foam board insulation board has no phenolic foam inside the aluminum honeycomb core. That is, the structure of sample 1 is stainless steel skin-phenolic foam board-aluminum honeycomb core-stainless steel skin.

[0032] Sample 3: Based on Sample 2, a layer of 8mm, 160kg / m is added on the other side of the metal honeycomb core 3 The structure of sample 1 is stainless steel skin-phenolic foam board-aluminum honeycomb core-phenolic foam board-stainless steel skin.

[0033] The above samples 1-3 were placed in a DRCD-5050 intelligent thermal conductivity tester for thermal conductivity testing. The test results are as follows:

[0034] Before reaching thermal equilibrium, the thermal conductivity of sample 1 exceeded 3.5, which exceeded the test range of the equipment. The sample could not reach thermal equilibrium, indicating that filling the honeycomb core with foam has little effect on the thermal conductivity of the large plate.

[0035] Sample 2: After thermal equilibrium, the thermal conductivity of sample 2 is 0.190, which means that the thermal conductivity of the metal honeycomb core is significantly improved after adding a heat insulation board on one side.

[0036] Sample 3: After thermal equilibrium, the thermal conductivity of Sample 3 was measured to be 0.145, indicating that after adding insulation plates on both sides of the metal honeycomb core, the thermal conductivity was significantly reduced and the thermal conductivity effect was significantly improved.

[0037] Through the comparison of the above samples, it can be seen that the thermal conductivity of the metal honeycomb panel improved by this application is significantly reduced and the thermal insulation performance is significantly improved.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications are also within the protection scope of the present invention.

Claims

1. A metal honeycomb panel with flame retardant and heat-insulating functions, characterized in that: It comprises an upper layer, a lower layer, an upper heat insulation layer, a lower heat insulation layer and an intermediate structure layer, wherein the intermediate structure layer is sandwiched between the upper heat insulation layer and the lower heat insulation layer, the intermediate structure layer is composed of a skeleton and a metal honeycomb core material, and the metal honeycomb core material is arranged in a cavity surrounded by the skeleton; the upper layer is arranged on the upper side of the upper heat insulation layer, and the lower layer is arranged on the lower side of the lower heat insulation layer, and the upper layer, the upper heat insulation layer, the intermediate structure layer, the lower heat insulation layer and the lower layer are sequentially bonded by a flame retardant adhesive; the upper layer and the lower layer are both thin-walled metal plates, and the upper heat insulation layer and the lower heat insulation layer are both phenolic foam boards; The thickness of the phenolic foam board is 5 to 100 mm.

2. The metal honeycomb panel according to claim 1, characterized in that: The thickness of the thin-walled metal plate is 0.8 mm to 1.5 mm.

3. The metal honeycomb panel according to claim 1, characterized in that: The frame is a metal frame or a non-metal frame. The metal frame is made of a steel pipe or an aluminum profile; the non-metal frame is made of a carbon fiber tube, a glass fiber tube or a PU tube with a flame retardant grade of at least B2.

4. The metal honeycomb panel according to claim 1, characterized in that: The thickness of the skeleton and the metal honeycomb core material is 10 to 200 mm.

5. The metal honeycomb panel according to claim 1, characterized in that: The adhesive is epoxy adhesive, polyurethane adhesive, epoxy film or polyurethane film.

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