Aluminum alloy cellular board with stamping type drawing cavity and preparation method of aluminum alloy cellular board

Abstract

The invention discloses an aluminum alloy cellular board with a stamping type drawing cavity and a preparation method of the aluminum alloy cellular board, and relates to the technical field of cellular board preparation, and the preparation method comprises the steps that an aluminum board blank is sequentially subjected to water washing, oil removal, degreasing, passivation and drying treatment, and a lower plywood is obtained; the aluminum plate blank is sequentially subjected to water washing, oil removal, degreasing, passivation and drying treatment, and an upper plywood is obtained; spraying a coating on the upper plywood and the lower plywood, and stamping the upper plywood and the lower plywood into a drawing cavity; the preparation method comprises the following steps: adding an organic flame-retardant material into an adhesive, adding a modified material, adhering a lower plywood with a drawing cavity and an upper plywood with a drawing cavity to an aluminum honeycomb core through the modified adhesive, and pressing to obtain the aluminum alloy honeycomb plate. According to the aluminum alloy honeycomb plate with the stamping type drawing cavity and the preparation method of the aluminum alloy honeycomb plate, the overall mechanical performance and durability of the aluminum alloy honeycomb plate are improved, the hydrophobicity and corrosion resistance of the aluminum alloy honeycomb plate are improved, the influence of the aluminum alloy honeycomb plate on the environment is reduced, and the aluminum alloy honeycomb plate can be conveniently recycled in the future.

Description

Technical Field

[0001] The invention relates to the technical field of honeycomb panel preparation, and in particular to an aluminum alloy honeycomb panel with a stamping-type drawing cavity and a preparation method thereof. Background Art

[0002] Aluminum alloy honeycomb panel with stamping drawing cavity is a lightweight, high-strength aluminum alloy composite material plate prepared by stamping process using bionic principles. This plate is based on aluminum honeycomb core and covered with thin aluminum alloy panels on both sides to form a sandwich structure. The center of the aluminum alloy honeycomb panel is composed of many small hexagonal honeycomb aluminum structures. These honeycomb structures can disperse pressure and provide extremely high strength and rigidity. Due to its special structure, it is very light in weight, weighing only 3 to 7 kilograms per square meter, which greatly reduces the building load and cost. At the same time, the air layer in the honeycomb material also has good sound insulation (air sound insulation can reach 30dB) and heat insulation performance (thermal resistance can reach 0.02 (㎡·K / W)), making it widely used in building curtain walls, interior decoration and other fields.

[0003] At present, the main raw material of aluminum alloy honeycomb panels is high-quality aluminum alloy, especially 3003H24 alloy aluminum plate or 5052AH14 high manganese alloy aluminum plate. Although aluminum alloy honeycomb panels have good overall strength and rigidity, due to their unique honeycomb structure, stress concentration is easy to occur at certain points, especially two aluminum plywood sheets bonded by glue, which may be misaligned when subjected to external force, resulting in local damage, thereby affecting the strength and rigidity of the aluminum alloy honeycomb panels. At the same time, since the surface of the aluminum alloy honeycomb panels is easily affected by dust and oil during use, the surface treatment of the aluminum alloy honeycomb panels cannot guarantee efficient cleaning and the flame retardant performance is weakened. In addition, some waste and scraps will be generated during the production process of the aluminum alloy honeycomb panels, as well as the processing and recycling of the aluminum alloy honeycomb panels themselves. If not handled properly, it will cause pollution to the environment and will not be convenient for the future recycling of the aluminum alloy honeycomb panels.

[0004] Therefore, an aluminum alloy honeycomb panel with a stamping and drawing cavity and a preparation method thereof are proposed to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for preparing an aluminum alloy honeycomb panel with a stamping and drawing cavity which has high hardness, strong flame retardancy and wear resistance, and is applied to the preparation of the aluminum alloy honeycomb panel with a stamping and drawing cavity.

[0006] To achieve the above object, the technical solution adopted by the present invention is: an aluminum alloy honeycomb panel with a stamping and drawing cavity, and the preparation method is specifically as follows: Step 1: preparing the lower plywood, washing, degreasing, degreasing, passivation and drying the aluminum sheet blank in sequence to obtain the lower plywood; Step 2: preparing the upper clad plate, washing, degreasing, degreasing, passivation and drying the aluminum plate blank in sequence to obtain the upper clad plate; Step 3: Surface treatment, spray coating on the upper and lower panels, and punch the upper and lower panels into drawing cavities; Step 4: preparing a modified adhesive, adding an organic flame retardant material to the adhesive, and adding a modifying material to obtain a modified adhesive; Step 5: Bond the two lower and upper panels with the drawing cavity to the aluminum honeycomb core through a modified adhesive, and press them together to obtain an aluminum alloy honeycomb panel.

[0007] The processing in step 1 also includes spraying and wood grain transfer; The lower cladding plate and the upper cladding plate are both made of one or more of 7075-T6 aluminum alloy, 2024-T3 aluminum alloy, aluminum-copper-magnesium alloy, aluminum-silicon alloy and aluminum-zinc alloy; Spraying is to spray the spray coating in step 3 on the surface of the upper and lower panels; The wood grain transfer is to place the thermal transfer wood grain paper on the surface of the sprayed lower and upper plywood, and place the lower and upper plywood in a heating furnace with a furnace temperature between 180°C and 220°C for 600S to 720S.

[0008] The spray coating is prepared from 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane, nano-alumina, silane coupling agent and modified epoxy resin; The spray coating has the following proportions: 10% to 20% of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 10% to 20% of nano-alumina, 10% to 15% of silane coupling agent and 20% to 40% of modified epoxy resin.

[0009] The modified epoxy resin is prepared by mixing liquid chloroprene-hydroxyethyl methacrylate copolymer, polysulfide rubber, polybutadiene, liquid carboxyl-terminated nitrile rubber, nano-siloxane and nano-calcium carbonate; The modified epoxy resin has the following proportions: 10% of liquid chloroprene-hydroxyethyl methacrylate copolymer, 10% of polybutadiene, 10% of liquid carboxyl-terminated nitrile rubber, 10% of nano-siloxane, 10% of nano-calcium carbonate, 10% of polybutyl acrylate and 40% of epoxy resin.

[0010] The silane coupling agent is any one of an amino silane coupling agent and an epoxy silane coupling agent, or a mixture of two or more thereof.

[0011] The cross-section of the drawing cavity is one or more of a square, a circle, an ellipse, a trapezoid, a D-shape, a semicircle, a diamond, a pentagon, a hexagon, an octagon, a Tai Chi shape, a crescent, a cross, a triangle, an X-shape, a tic-tac-toe shape or a grid.

[0012] The modified adhesive is prepared by mixing an organic flame retardant material, a modified material, a thickener, N,N-dimethyl-N'-phenylsulfonamide and an adhesive; The modified adhesive has the following proportions: 20% to 30% of organic flame retardant material, 10% to 20% of modified material, 5% to 10% of thickener, 2% to 5% of N,N-dimethyl-N'-phenylsulfonamide and 40% to 60% of adhesive.

[0013] The thickener is any one of silicone gel, methyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose and hydroxyethyl cellulose, or a mixture of two or more thereof.

[0014] The organic flame retardant material is one or more of decabromobiphenyl acid, tetrabromobisphenol, triphenyl phosphate, trichloroethylene, brominated polystyrene, chlorinated paraffin and chlorinated polyethylene.

[0015] The modified material includes at least one of mullite fiber, alumina fiber, diphenyl phosphate and monophenyl phosphate; The N,N-dimethyl-N'-phenylsulfonamide, alumina fiber and mullite fiber are used in coordination.

[0016] The present invention has the following beneficial effects: 1. In the present invention, 1H,1H,2H,2H-perfluorodecyltrimethoxysilane and nano-alumina are mixed, and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane and nano-alumina utilize the characteristics of nano materials to improve the overall mechanical properties and durability of the aluminum alloy honeycomb panel, avoid local damage to the honeycomb structure unique to the aluminum alloy honeycomb panel, and further combine 1H,1H,2H,2H-perfluorodecyltrimethoxysilane and nano-alumina with N,N-dimethyl-N'-phenylsulfonamide, so that the strength and rigidity of the aluminum alloy honeycomb panel are further improved, the hydrophobicity and corrosion resistance of the aluminum alloy honeycomb panel are increased, and the service life of the aluminum alloy honeycomb panel is extended.

[0017] 2. In the present invention, the flame retardant strength and self-extinguishing property of the aluminum alloy honeycomb panel can be improved by combining tetrabromobisphenol and N,N-dimethyl-N'-phenylsulfonamide in the organic flame retardant material. The bromine atoms in tetrabromobisphenol can slow down the burning speed of the material to achieve the purpose of flame retardancy. N,N-dimethyl-N'-phenylsulfonamide will not excessively affect the thermal stability of the substrate while improving the flame retardant performance, thereby improving the flame retardant strength of the aluminum alloy honeycomb panel. At the same time, a protective layer can be added to the surface of the aluminum alloy honeycomb panel by spraying the coating, thereby reducing the influence of dust and oil on the aluminum alloy honeycomb panel.

[0018] 3. In the present invention, by combining the high hardness of alumina fiber with the toughness of N,N-dimethyl-N'-phenylsulfonamide, the aluminum alloy honeycomb panel has high resistance to wear, N,N-dimethyl-N'-phenylsulfonamide can reduce the friction resistance on the surface of the aluminum alloy honeycomb panel, improve the wear resistance of the aluminum alloy honeycomb panel, and triphenyl phosphate can be degraded into phenol and carbon dioxide through diphenyl phosphate and monophenyl phosphate. Phenol enables the modified adhesive to better penetrate into the gaps or uneven places on the surface of the aluminum alloy honeycomb panel, and after solidification on the aluminum alloy honeycomb panel, it is convenient for the aluminum alloy honeycomb panel to be recycled in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic diagram of the overall process of an aluminum alloy honeycomb panel with a stamping and drawing cavity and a preparation method thereof. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Comparative Example An aluminum alloy honeycomb panel with a stamping-type drawing cavity and a preparation method thereof, comprising the following steps: Step 1: preparing the lower plywood, washing, degreasing, degreasing, passivation and drying the aluminum sheet blank in sequence to obtain the lower plywood; Step 2: preparing the upper clad plate, washing, degreasing, degreasing, passivation and drying the aluminum plate blank in sequence to obtain the upper clad plate; Step 3: Surface treatment, punching the upper and lower panels into a drawing cavity; Step 4: Bond the two lower and upper panels with the drawing cavity to the aluminum honeycomb core by adhesive, and press them together to obtain an aluminum alloy honeycomb panel.

[0022] The comparative example is a preparation step of the prior art for preparing a semi-finished aging-resistant water-based adhesive. The comparative example is compared with Example 1, Example 2 and Example 3. The comparison results are as follows: the comparative example lacks 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane and nano-alumina compared with Example 1; the comparative example lacks organic flame retardant materials, tetrabromobisphenol and N, N-dimethyl-N'-phenylsulfonamide compared with Example 2; and the comparative example lacks diphenyl phosphate and monophenyl phosphate compared with Example 3.

[0023] Example 1 Please refer to Figure 1 As shown: An aluminum alloy honeycomb panel with a stamping drawing cavity and a preparation method thereof, comprising the following steps: Step 1: preparing the lower plywood, washing, degreasing, degreasing, passivation and drying the aluminum sheet blank in sequence to obtain the lower plywood; Step 2: preparing the upper clad plate, washing, degreasing, degreasing, passivation and drying the aluminum plate blank in sequence to obtain the upper clad plate; Step 3: Surface treatment, spray coating on the upper and lower panels, and punch the upper and lower panels into drawing cavities; Step 4: preparing a modified adhesive, adding an organic flame retardant material to the adhesive, and adding a modifying material to obtain a modified adhesive; Step 5: Bond the two lower and upper panels with the drawing cavity to the aluminum honeycomb core through a modified adhesive, and press them together to obtain an aluminum alloy honeycomb panel.

[0024] The processing in step one also includes spraying and wood grain transfer; The lower cladding plate and the upper cladding plate are made of one or more of 7075-T6 aluminum alloy, 2024-T3 aluminum alloy, aluminum-copper-magnesium alloy, aluminum-silicon alloy and aluminum-zinc alloy; Spraying is to spray the spray coating in step 3 on the surface of the upper and lower panels; The wood grain transfer is to place the thermal transfer wood grain paper on the surface of the sprayed lower and upper plywood, and place the lower and upper plywood in a heating furnace with a furnace temperature between 180°C and 220°C for 600S to 720S.

[0025] The spray coating is prepared from 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, nano-alumina, silane coupling agent and modified epoxy resin; The spray coating has the following formula: 10% to 20% of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 10% to 20% of nano-alumina, 10% to 15% of silane coupling agent and 20% to 40% of modified epoxy resin.

[0026] Through the above-mentioned proportions, the preparation of the aluminum alloy honeycomb panel with a stamping drawing cavity in Example 1 and the comparative example has the following advantages: 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane and nano-alumina utilize the characteristics of nanomaterials to form a strong composite coating to improve the overall mechanical properties and durability of the aluminum alloy honeycomb panel, avoid local damage to the honeycomb structure unique to the aluminum alloy honeycomb panel, and further combine 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane and nano-alumina with N, N-dimethyl-N'-phenylsulfonamide, so that the strength and stiffness of the aluminum alloy honeycomb panel are further improved, while increasing the hydrophobicity and corrosion resistance of the aluminum alloy honeycomb panel.

[0027] Example 2 Please refer to Figure 1 As shown: Based on Example 1, the modified epoxy resin is mixed with liquid chloroprene-hydroxyethyl methacrylate copolymer, polysulfide rubber, polybutadiene, liquid carboxyl-terminated nitrile rubber, nano-siloxane and nano-calcium carbonate; The modified epoxy resin has the following formula: 10% of liquid chloroprene-hydroxyethyl methacrylate copolymer, 10% of polybutadiene, 10% of liquid carboxyl-terminated nitrile rubber, 10% of nano-siloxane, 10% of nano-calcium carbonate, 10% of polybutyl acrylate and 40% of epoxy resin.

[0028] The silane coupling agent is any one of an amino silane coupling agent and an epoxy silane coupling agent, or a mixture of two or more thereof.

[0029] The cross section of the drawing cavity is one or more of square, circular, elliptical, trapezoidal, D-shaped, semicircular, rhombus, pentagon, hexagon, octagon, Tai Chi figure, crescent, cross, triangle, X-shaped, tic-tac-toe or grid.

[0030] The modified adhesive is prepared by mixing an organic flame retardant material, a modified material, a thickener, N,N-dimethyl-N'-phenylsulfonamide and an adhesive; The modified adhesive has the following proportions: 20% to 30% of organic flame retardant material, 10% to 20% of modified material, 5% to 10% of thickener, 2% to 5% of N,N-dimethyl-N'-phenylsulfonamide and 40% to 60% of adhesive.

[0031] Through the above-mentioned ratio, the aluminum alloy honeycomb panel with a stamping drawing cavity prepared in Example 2 and the comparative example has the following advantages: the combination of tetrabromobisphenol and N,N-dimethyl-N'-phenylsulfonamide can improve the flame retardancy strength and self-extinguishing property of the aluminum alloy honeycomb panel, the bromine atoms in tetrabromobisphenol can rapidly decompose and capture free radicals in the gas phase at high temperature, thereby slowing down the burning rate of the material, the free radicals in tetrabromobisphenol can achieve the purpose of flame retardancy, and N,N-dimethyl-N'-phenylsulfonamide will not excessively affect the thermal stability of the substrate while improving the flame retardancy, thereby further improving the flame retardancy strength of the aluminum alloy honeycomb panel.

[0032] Example 3 Please refer to Figure 1 As shown: Based on Example 1, the thickener is any one of silicone gel, methyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose and hydroxyethyl cellulose, or a mixture of two or more thereof.

[0033] The organic flame retardant material is one or more of decabromobiphenyl acid, tetrabromobisphenol, triphenyl phosphate, trichloroethylene, brominated polystyrene, chlorinated paraffin and chlorinated polyethylene.

[0034] The modified material includes at least one of mullite fiber, alumina fiber, diphenyl phosphate and monophenyl phosphate; N,N-dimethyl-N'-phenylsulfonamide, alumina fiber and mullite fiber are used in coordination.

[0035] Through the above-mentioned ratio, the preparation of the aluminum alloy honeycomb panel with a stamping drawing cavity in Example 3 and the comparative example has the following advantages: the high hardness of the alumina fiber is combined with the toughness of N,N-dimethyl-N'-phenylsulfonamide, so that the aluminum alloy honeycomb panel has high resistance to wear, N,N-dimethyl-N'-phenylsulfonamide has self-lubricating properties, which can reduce the friction resistance on the surface of the aluminum alloy honeycomb panel, and further improve the wear resistance of the aluminum alloy honeycomb panel. In addition, triphenyl phosphate can be degraded into phenol and carbon dioxide through diphenyl phosphate and monophenyl phosphate. Phenol can increase the viscosity and fluidity of the modified adhesive, so that the modified adhesive can better penetrate into the gaps or bumps on the surface of the aluminum alloy honeycomb panel, and after curing, it is on the aluminum alloy honeycomb panel, thereby reducing the impact of the aluminum alloy honeycomb panel on the environment.

[0036] Comparative Example 1 The aluminum alloy honeycomb panel with a stamping and drawing cavity provided in this comparative example is substantially the same as that in Example 1, the main difference being that in Example 1, 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane and nano-alumina are mixed for reaction.

[0037] Comparative Example 2 The aluminum alloy honeycomb panel with a stamping and drawing cavity provided in this comparative example is substantially the same as that in Example 1, the main difference is that in Example 2, tetrabromobisphenol and N,N-dimethyl-N'-phenylsulfonamide are mixed for reaction.

[0038] Comparative Example 3 The aluminum alloy honeycomb panel with a stamping and drawing cavity provided in this comparative example is substantially the same as that in Example 1, the main difference being that in Example 3, the high hardness of alumina fiber is combined with the toughness of N,N-dimethyl-N'-phenylsulfonamide.

[0039] The test results of hardness, flame retardancy and wear resistance are shown in Table 1 below:

[0040] Table 1: Tests of hardness, flame retardancy and wear resistance, tested by contact angle measurement and high temperature test:

[0041] It can be seen from the test results in the above table that the aluminum alloy honeycomb panels with stamping and drawing cavities prepared in Examples 1, 2 and 3 can improve the overall mechanical properties and durability of the aluminum alloy honeycomb panels, and avoid local damage to the honeycomb structure unique to the aluminum alloy honeycomb panels, compared with the comparative examples; improve the flame retardant strength of the aluminum alloy honeycomb panels, and at the same time, by spraying the coating, a protective layer can be added to the surface of the aluminum alloy honeycomb panels to reduce the impact of dust and oil on the aluminum alloy honeycomb panels; reduce the friction resistance on the surface of the aluminum alloy honeycomb panels, reduce the impact of the aluminum alloy honeycomb panels on the environment, and facilitate the future recycling of the aluminum alloy honeycomb panels.

[0042] The present invention provides an aluminum alloy honeycomb panel with a stamping type drawing cavity and a preparation method thereof. During operation, the method comprises the following steps: firstly, the aluminum plate blank is sequentially subjected to water washing, oil removal, degreasing, passivation and drying treatments to obtain a lower plywood; the aluminum plate blank is sequentially subjected to water washing, oil removal, degreasing, passivation and drying treatments to obtain an upper plywood; a coating is sprayed on the upper plywood and the lower plywood, and the upper plywood and the lower plywood are stamped into a drawing cavity; a spray coating is prepared by mixing 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane and nano-alumina, and adding modified epoxy resin; the 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane and nano-alumina utilize the characteristics of nano-materials to form a strong composite coating, which can improve the strength of the aluminum alloy. The overall mechanical properties and durability of the gold honeycomb panel are improved to avoid local damage to the honeycomb structure unique to the aluminum alloy honeycomb panel, and 1H, 1H, 2H, 2H-perfluorodecyl trimethoxysilane and nano-alumina are further combined with N, N-dimethyl-N'-phenylsulfonamide to further improve the strength and stiffness of the aluminum alloy honeycomb panel, while increasing the hydrophobicity and corrosion resistance of the aluminum alloy honeycomb panel and extending the service life of the aluminum alloy honeycomb panel; organic flame retardant materials are added to the adhesive, and modified materials are added to obtain a modified adhesive. By combining tetrabromobisphenol in the organic flame retardant material with N, N-dimethyl-N'-phenylsulfonamide, the flame retardant strength and self-extinguishing properties of the aluminum alloy honeycomb panel can be improved. Tetrabromobisphenol The bromine atoms in the tetrabromobisphenol can quickly decompose and capture free radicals in the gas phase at high temperatures, thereby slowing down the burning rate of the material. The free radicals in tetrabromobisphenol can achieve the purpose of flame retardancy. N,N-dimethyl-N'-phenylsulfonamide will not excessively affect the thermal stability of the substrate while improving the flame retardancy, thereby further improving the flame retardancy of the aluminum alloy honeycomb panel. At the same time, the spray coating can increase the protective layer on the surface of the aluminum alloy honeycomb panel to reduce the impact of dust and oil on the aluminum alloy honeycomb panel, further ensuring that the surface treatment of the aluminum alloy honeycomb panel can ensure efficient cleaning; two lower and upper panels with a drawing cavity are bonded to an aluminum honeycomb core through a modified adhesive, and pressed together to obtain an aluminum alloy honeycomb panel. By The high hardness of the aluminum alloy honeycomb panel is combined with the toughness of N, N-dimethyl-N'-phenylsulfonamide, so that the aluminum alloy honeycomb panel has high resistance to wear. N, N-dimethyl-N'-phenylsulfonamide has self-lubricating properties, which can reduce the friction resistance on the surface of the aluminum alloy honeycomb panel, and further improve the wear resistance of the aluminum alloy honeycomb panel. Diphenyl phosphate and monophenyl phosphate can degrade triphenyl phosphate into phenol and carbon dioxide. Phenol can increase the viscosity and fluidity of the modified adhesive, so that the modified adhesive can better penetrate into the gaps or bumps on the surface of the aluminum alloy honeycomb panel, and after curing, it will be on the aluminum alloy honeycomb panel, thereby reducing the impact of the aluminum alloy honeycomb panel on the environment and facilitating the future recycling of the aluminum alloy honeycomb panel.

[0043] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing an aluminum alloy honeycomb panel having a stamping and drawing cavity, characterized in that: The preparation method is specifically: Step 1: preparing the lower plywood, washing, degreasing, degreasing, passivation and drying the aluminum sheet blank in sequence to obtain the lower plywood; Step 2: preparing the upper clad plate, washing, degreasing, degreasing, passivation and drying the aluminum plate blank in sequence to obtain the upper clad plate; Step 3: Surface treatment, spray coating on the upper and lower panels, and punch the upper and lower panels into drawing cavities; Step 4: preparing a modified adhesive, adding an organic flame retardant material to the adhesive, and adding a modifying material to obtain a modified adhesive; Step 5: Bond the two lower and upper panels with the drawing cavity to the aluminum honeycomb core through a modified adhesive, and press them together to obtain an aluminum alloy honeycomb panel.

2. The preparation method according to claim 1, characterized in that: The processing in step 1 also includes spraying and wood grain transfer; The lower cladding plate and the upper cladding plate are both made of one or more of 7075-T6 aluminum alloy, 2024-T3 aluminum alloy, aluminum-copper-magnesium alloy, aluminum-silicon alloy and aluminum-zinc alloy; Spraying is to spray the spray coating in step 3 on the surface of the upper and lower panels; The wood grain transfer is to place the thermal transfer wood grain paper on the surface of the sprayed lower and upper plywood, and place the lower and upper plywood in a heating furnace with a furnace temperature between 180°C and 220°C for 600S to 720S.

3. The preparation method according to claim 1, characterized in that: The spray coating is prepared from 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane, nano-alumina, silane coupling agent and modified epoxy resin; The spray coating has the following proportions: 10% to 20% of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane, 10% to 20% of nano-alumina, 10% to 15% of silane coupling agent and 20% to 40% of modified epoxy resin.

4. The preparation method according to claim 3, characterized in that: The modified epoxy resin is prepared by mixing liquid chloroprene-hydroxyethyl methacrylate copolymer, polysulfide rubber, polybutadiene, liquid carboxyl-terminated nitrile rubber, nano-siloxane and nano-calcium carbonate; The modified epoxy resin has the following proportions: 10% of liquid chloroprene-hydroxyethyl methacrylate copolymer, 10% of polybutadiene, 10% of liquid carboxyl-terminated nitrile rubber, 10% of nano-siloxane, 10% of nano-calcium carbonate, 10% of polybutyl acrylate and 40% of epoxy resin.

5. The preparation method according to claim 3, characterized in that: The silane coupling agent is any one of an amino silane coupling agent and an epoxy silane coupling agent, or a mixture of two or more thereof.

6. The preparation method according to claim 1, characterized in that: The cross-section of the drawing cavity is one or more of a square, a circle, an ellipse, a trapezoid, a D-shape, a semicircle, a diamond, a pentagon, a hexagon, an octagon, a Tai Chi shape, a crescent, a cross, a triangle, an X-shape, a tic-tac-toe shape or a grid.

7. The preparation method according to claim 1, characterized in that: The modified adhesive is prepared by mixing an organic flame retardant material, a modified material, a thickener, N,N-dimethyl-N'-phenylsulfonamide and an adhesive; The modified adhesive has the following proportions: 20% to 30% of organic flame retardant material, 10% to 20% of modified material, 5% to 10% of thickener, 2% to 5% of N,N-dimethyl-N'-phenylsulfonamide and 40% to 60% of adhesive.

8. The preparation method according to claim 7, characterized in that: The thickener is any one of silicone gel, methyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose and hydroxyethyl cellulose, or a mixture of two or more thereof.

9. The preparation method according to claim 8, characterized in that: The organic flame retardant material is one or more of decabromobiphenyl acid, tetrabromobisphenol, triphenyl phosphate, trichloroethylene, brominated polystyrene, chlorinated paraffin and chlorinated polyethylene.

10. The preparation method according to claim 9, characterized in that: The modified material includes at least one of mullite fiber, alumina fiber, diphenyl phosphate and monophenyl phosphate; The N,N-dimethyl-N'-phenylsulfonamide, alumina fiber and mullite fiber are used in coordination.

Images