Large-thickness high-strength aluminum alloy cellular board and preparation method thereof

Abstract

The invention provides a large-thickness high-strength aluminum alloy honeycomb plate and a preparation method thereof.The preparation method comprises the following steps that (1) a honeycomb core plate block obtained by stacking a plurality of aluminum alloy foil strips is stretched to obtain a honeycomb core, and the honeycomb core and an aluminum alloy cover plate are assembled and brazed; (2) brazing paste is prepared, wherein the brazing paste is composed of aluminum-based brazing filler metal, brazing flux, an organic solvent and a binding agent; the brazing flux is potassium fluoroaluminate and cesium fluoroaluminate; the binder is polystyrene resin; (3) any aluminum alloy foil strip is coated with brazing paste at equal intervals, brazing areas with the same width are formed, and the width of each brazing area is one third of the width of each interval blank area; and after superposition, the brazing area on each aluminum alloy foil tape corresponds to the central position of the blank area of the adjacent aluminum alloy foil tape. The aluminum alloy honeycomb plate is high in strength, and popularization of the honeycomb plate is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy honeycomb panels, and in particular relates to a thick and high-strength aluminum alloy honeycomb panel and a preparation method thereof. Background Art

[0002] Aluminum alloy honeycomb panel is a lightweight, high-strength composite material consisting of two layers of panels and a honeycomb core in the middle. This structure gives aluminum alloy honeycomb panels excellent rigidity and stability while maintaining a low weight. Characteristics and uses of aluminum alloy honeycomb panels: Lightweight and high strength: The honeycomb structure can provide excellent rigidity and stability while maintaining a low weight. Sound insulation and heat insulation: The honeycomb core can effectively isolate sound and heat transfer, providing good sound insulation and heat insulation. Corrosion resistance: Aluminum alloy materials have good corrosion resistance and are suitable for use in a variety of environments. Easy to process: It can be cut, drilled, bent, and processed as needed. Environmental protection: It can be recycled and meets environmental protection requirements. It is widely used in the interior decoration of transportation vehicles such as aircraft, high-speed trains, and subway carriages. Used for exterior wall decorative panels, interior partitions, ceilings, etc. Make transport pallets, boxes, etc. Used to make high-end furniture, such as desktop panels, cabinet doors, etc. Because of its beautiful appearance and easy processing, it is often used to make billboards, exhibition stands, etc.

[0003] In recent years, with the rapid development of urban rail transit in my country, the demand for the application of aluminum honeycomb panels in rail transit vehicle bodies, floors, interior wall panels and other components has increased significantly. At present, most aluminum honeycomb panels for vehicle bodies are manufactured by gluing. However, the strength and service life of aluminum honeycomb panels produced by this manufacturing method are limited by the performance of the adhesive. Under extreme working conditions, such as high humidity, strong vibration, high or low temperature, the adhesive may age, fall off, and cause a significant decrease in the reliability of the aluminum honeycomb panels, thus posing serious safety hazards.

[0004] Therefore, there is an urgent need for a thick and high-strength aluminum alloy honeycomb panel and a preparation method thereof. Summary of the invention

[0005] The purpose of the present invention is to provide a thick and high-strength aluminum alloy honeycomb panel and a preparation method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A method for preparing a thick and high-strength aluminum alloy honeycomb panel, the method comprising the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11% to 12% silicon, 1.2% to 1.8% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

[0007] Furthermore, the aluminum alloy foil is made of 6061.

[0008] Furthermore, the preparation method of the polystyrene resin comprises the following steps: (1) Weighing by weight: 100 parts of polystyrene, 3-6 parts of maleic anhydride, 34-39 parts of carbonizing agent, 36-43 parts of catalyst, 12-15 parts of foaming agent, 6-10 parts of modified filler, 5-10 parts of emulsifier, 10-14 parts of plasticizer, and 200-250 parts of solvent; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, modified filler and maleic anhydride are first mixed uniformly, and then added into 150-200 parts of solvent and mixed uniformly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

[0009] Furthermore, in the step (2), the solution is heated to 40-60° C. and stirred to dissolve.

[0010] Furthermore, the carbonizing agent is selected from one or more of pentaerythritol, sorbitol and polyethylene glycol.

[0011] Furthermore, the catalyst is selected from one or more of boric acid and ammonium polyphosphate.

[0012] Furthermore, the foaming agent is selected from one or more of melamine and ammonium polyphosphate.

[0013] Furthermore, the preparation method of the modified filler comprises the following steps: (1) mixing carboxylated double-walled carbon nanotubes and graphene oxide in a mass ratio of 1:(0.3-0.6) to obtain a filler; (2) Under a nitrogen atmosphere, 2-4 parts by mass of polyethyleneimine and 6-8 parts by mass of water are mixed to obtain a polyethyleneimine aqueous solution, and the polyethyleneimine aqueous solution is mixed with 1 part by mass of a filler, stirred at 62-65° C. for 8-10 hours, centrifuged, and dried to obtain a modified filler.

[0014] Furthermore, the emulsifier is sodium dodecyl sulfate.

[0015] Furthermore, the plasticizer is selected from one or more of dibutyl phthalate and dimethyl phthalate.

[0016] Furthermore, the solvent is selected from ethyl acetate or cyclohexanone Furthermore, the particle size of the aluminum-based solder is 190-250 mesh.

[0017] Furthermore, the particle size of the flux is 200-325 meshes.

[0018] The invention provides a honeycomb plate prepared by the preparation method.

[0019] Compared with the prior art, the advantages and beneficial effects of the present invention are: 1. The present invention uses a special solder paste, which contains ingredients such as aluminum-based solder, brazing agent, organic solvent and adhesive. The solder paste plays a role of connection and reinforcement in the manufacturing process of aluminum alloy honeycomb panels. The aluminum-based solder has good fluidity, can achieve good welding effect at a lower temperature, and helps to form a strong connection. The brazing agent can remove the oxide film and other impurities on the surface of the aluminum alloy, ensure the cleanliness of the welding interface, and thus improve the welding quality. The adhesive can enhance the adhesion of the solder paste, so that the solder can adhere more firmly to the surface of the aluminum alloy during welding. The adhesive of the present invention includes the components of polystyrene resin: maleic anhydride: maleic anhydride can improve the heat resistance and chemical stability of the resin. Carbonizer and catalyst: These ingredients help to improve the curing properties of the resin and enhance its mechanical strength. Foaming agent and modified filler: The foaming agent can help form an appropriate pore structure, while the modified filler can improve the hardness and wear resistance of the resin. Emulsifier and plasticizer: These ingredients help to improve the fluidity and processing properties of the resin, making it easier to coat and cure. Considering the effects of the above ingredients, this solder paste can improve the strength of aluminum alloy honeycomb panels, which is mainly reflected in the following aspects: Enhanced connection strength: The aluminum-based brazing material and brazing flux in the solder paste can form a strong welding interface and improve the connection strength between the various components of the aluminum alloy honeycomb panel. Improved durability: The ingredients in the solder paste can improve the heat resistance and chemical stability of the entire structure, thereby extending the service life of the aluminum alloy honeycomb panel. Improved mechanical properties: By optimizing the solder paste formula, the impact resistance and wear resistance of the aluminum alloy honeycomb panel can be improved. In summary, this solder paste, through its ingredients and formula, can improve its connection strength and overall performance during the manufacturing process of the aluminum alloy honeycomb panel, thereby improving the strength and reliability of the honeycomb panel.

[0020] 2. The present invention adds modified fillers to the binder in the solder paste, which can improve the strength of the aluminum alloy honeycomb panel. Carboxylation of double-walled carbon nanotubes enhances mechanical properties: CDWCNTs have high strength and elastic modulus, which can significantly improve the mechanical properties of the composite material. Improve interface bonding: Carboxylation treatment can increase the interaction between CDWCNTs and the matrix material and improve the interface bonding force. Graphene oxide (GO): Improve thermal stability: GO has good thermal stability and thermal conductivity, which can improve the thermal stability of the composite material. Enhance barrier properties: GO sheets can block moisture penetration and reduce the aging risk of solder paste in high temperature and high humidity environments. Polyethyleneimine (PEI): Improve dispersibility: PEI is a polymer with good dispersibility, which can promote the uniform dispersion of CDWCNTs and GO in the solder paste. Enhance bonding strength: PEI can react with the functional groups on the surface of CDWCNTs and GO to form a stronger bonding force, thereby improving the bonding strength between the filler and the matrix material. Preparation process of modified fillers: Enhanced dispersibility: Preparation under a nitrogen atmosphere can avoid oxidation, and the presence of PEI helps to improve the dispersibility of the filler. Improved compatibility: The mixing of PEI and filler helps to improve the compatibility between the filler and other components in the solder paste. Improved binder performance: Improved fluidity: Modified fillers help to improve the fluidity of the solder paste, making it easier for the solder paste to penetrate into the tiny gaps of the aluminum alloy honeycomb panel to form a tighter connection. Enhanced bonding strength: Modified fillers can increase the bonding strength between the binder and the aluminum alloy honeycomb panel, thereby improving the strength and stability of the overall structure. In summary, by adding modified fillers to the binder of the solder paste, the strength of the aluminum alloy honeycomb panel can be improved, mainly because the modified fillers can enhance the performance of the binder, improve the interface bonding between the filler and the matrix material, and improve the fluidity and bonding strength of the solder paste, thereby improving the connection strength and overall performance of the aluminum alloy honeycomb panel. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 This embodiment provides a method for preparing a thick and high-strength aluminum alloy honeycomb panel, the method comprising the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11.5% silicon, 1.5% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

[0023] The material of the aluminum alloy foil is 6061.

[0024] The preparation method of the polystyrene resin comprises the following steps: (1) Weigh 100 parts of polystyrene, 4 parts of maleic anhydride, 36 parts of carbonizing agent, 40 parts of catalyst, 13 parts of foaming agent, 8 parts of modified filler, 7 parts of emulsifier, 14 parts of plasticizer, and 220 parts of solvent by weight; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, and modified filler are first mixed evenly with maleic anhydride, and then added into 180 parts of solvent and mixed evenly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

[0025] In the step (2), the solution is heated to 50° C. and stirred to dissolve.

[0026] The carbonizing agent is pentaerythritol.

[0027] The catalyst is boric acid.

[0028] The foaming agent is melamine.

[0029] The preparation method of the modified filler comprises the following steps: (1) mixing carboxylated double-walled carbon nanotubes and graphene oxide in a mass ratio of 1:0.5 to obtain a filler; (2) Under a nitrogen atmosphere, 3 parts by mass of polyethyleneimine and 7 parts by mass of water were mixed to obtain a polyethyleneimine aqueous solution. The polyethyleneimine aqueous solution was mixed with 1 part by mass of a filler, stirred at 64° C. for 9 h, centrifuged, and dried to obtain a modified filler.

[0030] The emulsifier is sodium dodecyl sulfate.

[0031] The plasticizer is dibutyl phthalate.

[0032] The solvent is ethyl acetate.

[0033] The particle size of the aluminum-based solder is 190-250 meshes.

[0034] The particle size of the flux is 200-325 meshes.

[0035] Example 2 This embodiment provides a method for preparing a thick and high-strength aluminum alloy honeycomb panel, the method comprising the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11% silicon, 1.8% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

[0036] The material of the aluminum alloy foil is 6061.

[0037] The preparation method of the polystyrene resin comprises the following steps: (1) Weigh 100 parts of polystyrene, 3 parts of maleic anhydride, 39 parts of carbonizing agent, 36 parts of catalyst, 15 parts of foaming agent, 10 parts of modified filler, 5 parts of emulsifier, 14 parts of plasticizer, and 200 parts of solvent by weight; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, modified filler and maleic anhydride are first mixed uniformly, and then added into 150-200 parts of solvent and mixed uniformly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

[0038] In the step (2), the solution is heated to 60° C. and stirred to dissolve.

[0039] The carbonizing agent is selected from sorbitol.

[0040] The catalyst is selected from ammonium polyphosphate.

[0041] The foaming agent is selected from ammonium phosphate.

[0042] The preparation method of the modified filler comprises the following steps: (1) mixing carboxylated double-walled carbon nanotubes and graphene oxide in a mass ratio of 1:0.6 to obtain a filler; (2) Under a nitrogen atmosphere, 4 parts by mass of polyethyleneimine and 8 parts by mass of water were mixed to obtain a polyethyleneimine aqueous solution. The polyethyleneimine aqueous solution was mixed with 1 part by mass of a filler, stirred at 62° C. for 10 h, centrifuged, and dried to obtain a modified filler.

[0043] The emulsifier is sodium dodecyl sulfate.

[0044] The plasticizer is selected from dibutyl phthalate.

[0045] The solvent is selected from ethyl acetate.

[0046] The particle size of the aluminum-based solder is 190-250 meshes.

[0047] The particle size of the flux is 200-325 meshes.

[0048] Comparative Example 1 The difference between this comparative example and Example 1 is that the ratio of the polystyrene resin raw materials is different.

[0049] A method for preparing a thick and high-strength aluminum alloy honeycomb panel, the method comprising the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11.5% silicon, 1.5% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

[0050] The material of the aluminum alloy foil is 6061.

[0051] The preparation method of the polystyrene resin comprises the following steps: (1) Weigh 100 parts of polystyrene, 2 parts of maleic anhydride, 30 parts of carbonizing agent, 33 parts of catalyst, 17 parts of foaming agent, 8 parts of modified filler, 7 parts of emulsifier, 14 parts of plasticizer, and 220 parts of solvent by weight; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, and modified filler are first mixed evenly with maleic anhydride, and then added into 180 parts of solvent and mixed evenly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

[0052] In the step (2), the solution is heated to 50° C. and stirred to dissolve.

[0053] The carbonizing agent is pentaerythritol.

[0054] The catalyst is boric acid.

[0055] The foaming agent is melamine.

[0056] The preparation method of the modified filler comprises the following steps: (1) mixing carboxylated double-walled carbon nanotubes and graphene oxide in a mass ratio of 1:0.5 to obtain a filler; (2) Under a nitrogen atmosphere, 3 parts by mass of polyethyleneimine and 7 parts by mass of water were mixed to obtain a polyethyleneimine aqueous solution. The polyethyleneimine aqueous solution was mixed with 1 part by mass of a filler, stirred at 64° C. for 9 h, centrifuged, and dried to obtain a modified filler.

[0057] The emulsifier is sodium dodecyl sulfate.

[0058] The plasticizer is dibutyl phthalate.

[0059] The solvent is ethyl acetate.

[0060] The particle size of the aluminum-based solder is 190-250 meshes.

[0061] The particle size of the flux is 200-325 meshes.

[0062] Comparative Example 2 The difference between this comparative example and Example 1 is that the added amount of the modified filler is different.

[0063] A method for preparing a thick and high-strength aluminum alloy honeycomb panel, the method comprising the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11.5% silicon, 1.5% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

[0064] The material of the aluminum alloy foil is 6061.

[0065] The preparation method of the polystyrene resin comprises the following steps: (1) Weigh 100 parts of polystyrene, 4 parts of maleic anhydride, 36 parts of carbonizing agent, 40 parts of catalyst, 13 parts of foaming agent, 3 parts of modified filler, 7 parts of emulsifier, 14 parts of plasticizer, and 220 parts of solvent by weight; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, and modified filler are first mixed evenly with maleic anhydride, and then added into 180 parts of solvent and mixed evenly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

[0066] In the step (2), the solution is heated to 50° C. and stirred to dissolve.

[0067] The carbonizing agent is pentaerythritol.

[0068] The catalyst is boric acid.

[0069] The foaming agent is melamine.

[0070] The preparation method of the modified filler comprises the following steps: (1) mixing carboxylated double-walled carbon nanotubes and graphene oxide in a mass ratio of 1:0.5 to obtain a filler; (2) Under a nitrogen atmosphere, 3 parts by mass of polyethyleneimine and 7 parts by mass of water were mixed to obtain a polyethyleneimine aqueous solution. The polyethyleneimine aqueous solution was mixed with 1 part by mass of a filler, stirred at 64° C. for 9 h, centrifuged, and dried to obtain a modified filler.

[0071] The emulsifier is sodium dodecyl sulfate.

[0072] The plasticizer is dibutyl phthalate.

[0073] The solvent is ethyl acetate.

[0074] The particle size of the aluminum-based solder is 190-250 meshes.

[0075] The particle size of the flux is 200-325 meshes.

[0076] Comparative Example 3 The difference between this comparative example and Example 1 is that the preparation method of the modified filler is different.

[0077] A method for preparing a thick and high-strength aluminum alloy honeycomb panel, the method comprising the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11.5% silicon, 1.5% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

[0078] The material of the aluminum alloy foil is 6061.

[0079] The preparation method of the polystyrene resin comprises the following steps: (1) Weigh 100 parts of polystyrene, 4 parts of maleic anhydride, 36 parts of carbonizing agent, 40 parts of catalyst, 13 parts of foaming agent, 8 parts of modified filler, 7 parts of emulsifier, 14 parts of plasticizer, and 220 parts of solvent by weight; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, and modified filler are first mixed evenly with maleic anhydride, and then added into 180 parts of solvent and mixed evenly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

[0080] In the step (2), the solution is heated to 50° C. and stirred to dissolve.

[0081] The carbonizing agent is pentaerythritol.

[0082] The catalyst is boric acid.

[0083] The foaming agent is melamine.

[0084] The preparation method of the modified filler comprises the following steps: (1) Mixing kaolin and silicon dioxide in a mass ratio of 1:0.5 to obtain a filler; (2) Under a nitrogen atmosphere, 3 parts by mass of polyethyleneimine and 7 parts by mass of water were mixed to obtain a polyethyleneimine aqueous solution. The polyethyleneimine aqueous solution was mixed with 1 part by mass of a filler, stirred at 64° C. for 9 h, centrifuged, and dried to obtain a modified filler.

[0085] The emulsifier is sodium dodecyl sulfate.

[0086] The plasticizer is dibutyl phthalate.

[0087] The solvent is ethyl acetate.

[0088] The particle size of the aluminum-based solder is 190-250 meshes.

[0089] The particle size of the flux is 200-325 meshes.

[0090] Comparative Example 4 The difference between this comparative example and Example 1 is that the ratio of carboxylated double-walled carbon nanotubes and graphene oxide is different.

[0091] A method for preparing a thick and high-strength aluminum alloy honeycomb panel, the method comprising the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11.5% silicon, 1.5% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

[0092] The material of the aluminum alloy foil is 6061.

[0093] The preparation method of the polystyrene resin comprises the following steps: (1) Weigh 100 parts of polystyrene, 4 parts of maleic anhydride, 36 parts of carbonizing agent, 40 parts of catalyst, 13 parts of foaming agent, 8 parts of modified filler, 7 parts of emulsifier, 14 parts of plasticizer, and 220 parts of solvent by weight; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, and modified filler are first mixed evenly with maleic anhydride, and then added into 180 parts of solvent and mixed evenly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

[0094] In the step (2), the solution is heated to 50° C. and stirred to dissolve.

[0095] The carbonizing agent is pentaerythritol.

[0096] The catalyst is boric acid.

[0097] The foaming agent is melamine.

[0098] The preparation method of the modified filler comprises the following steps: (1) mixing carboxylated double-walled carbon nanotubes and graphene oxide in a mass ratio of 1:1 to obtain a filler; (2) Under a nitrogen atmosphere, 3 parts by mass of polyethyleneimine and 7 parts by mass of water were mixed to obtain a polyethyleneimine aqueous solution. The polyethyleneimine aqueous solution was mixed with 1 part by mass of a filler, stirred at 64° C. for 9 h, centrifuged, and dried to obtain a modified filler.

[0099] The emulsifier is sodium dodecyl sulfate.

[0100] The plasticizer is dibutyl phthalate.

[0101] The solvent is ethyl acetate.

[0102] The particle size of the aluminum-based solder is 190-250 meshes.

[0103] The particle size of the flux is 200-325 meshes.

[0104] Performance Testing The aluminum alloy honeycomb panels prepared in Examples 1-2 of the present invention and Comparative Examples 1-4 were subjected to a roller peel strength test. The results are shown in Table 1.

[0105] Table 1 Performance test results

[0106] It can be seen from the above performance test results that the aluminum alloy honeycomb panels of Examples 1-2 are subjected to roller peel strength, while the comparative example is significantly inferior to the examples in the corresponding performance tests because it does not adopt the necessary technical scheme. The above experimental results further prove the importance of the technical scheme defined in the present invention to its technical effect.

[0107] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a thick and high-strength aluminum alloy honeycomb panel, characterized in that: The preparation method comprises the following steps: (1) stretching a honeycomb core plate obtained by stacking a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling the honeycomb core and the aluminum alloy cover plate and brazing them; (2) preparing a solder paste, the solder paste comprising an aluminum-based solder, a soldering agent, an organic solvent and a binder; the aluminum-based solder comprises, by mass percentage, 11% to 12% silicon, 1.2% to 1.8% copper and the remainder aluminum; the solder is potassium fluoroaluminate and cesium fluoroaluminate; and the binder is a polystyrene resin; (3) Brazing paste is coated on any of the aluminum alloy foil strips at equal intervals to form brazing areas of equal width, and the width of the brazing areas is 1 / 3 of the width of the interval blank areas; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of ​​the adjacent aluminum alloy foil strip.

2. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 1, characterized in that: The material of the aluminum alloy foil is 6061.

3. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 1, characterized in that: The preparation method of the polystyrene resin comprises the following steps: (1) Weighing by weight: 100 parts of polystyrene, 3-6 parts of maleic anhydride, 34-39 parts of carbonizing agent, 36-43 parts of catalyst, 12-15 parts of foaming agent, 6-10 parts of modified filler, 5-10 parts of emulsifier, 10-14 parts of plasticizer, and 200-250 parts of solvent; (2) Add polystyrene to 100 parts of solvent and stir to dissolve; (3) The carbonizing agent, catalyst, foaming agent, modified filler and maleic anhydride are first mixed uniformly, and then added into 150-200 parts of solvent and mixed uniformly; (4) slowly adding the mixture obtained in step (2) into the mixture obtained in step (3), and adding an emulsifier and a plasticizer, and mixing them uniformly to obtain the polystyrene resin.

4. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 3, characterized in that: In the step (2), the solution is heated to 40-60° C. and stirred to dissolve.

5. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 1, characterized in that: The carbonizing agent is selected from one or more of pentaerythritol, sorbitol and polyethylene glycol.

6. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 1, characterized in that: The catalyst is selected from one or more of boric acid and ammonium polyphosphate.

7. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 1, characterized in that: The foaming agent is selected from one or more of melamine and ammonium polyphosphate.

8. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 1, characterized in that: The preparation method of the modified filler comprises the following steps: (1) mixing carboxylated double-walled carbon nanotubes and graphene oxide in a mass ratio of 1:(0.3-0.6) to obtain a filler; (2) Under a nitrogen atmosphere, 2-4 parts by mass of polyethyleneimine and 6-8 parts by mass of water are mixed to obtain a polyethyleneimine aqueous solution, and the polyethyleneimine aqueous solution is mixed with 1 part by mass of a filler, stirred at 62-65° C. for 8-10 hours, centrifuged, and dried to obtain a modified filler.

9. The method for preparing a thick and high-strength aluminum alloy honeycomb panel according to claim 1, characterized in that: The particle size of the aluminum-based solder is 190-250 meshes.

10. A thick and high-strength aluminum alloy honeycomb panel made by the preparation method according to any one of claims 1 to 9.

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