Foamed aluminum sound insulation material for building wall and preparation method of foamed aluminum sound insulation material

Abstract

The invention relates to the technical field of building energy-saving sound insulation materials, in particular to a foamed aluminum sound insulation material for a building wall and a preparation method of the foamed aluminum sound insulation material for the building wall, and the method comprises the steps of foamed aluminum blank block preparation, filling mixture preparation, aluminum-plastic injection molding and the like. The scandium powder, the magnesium powder, the carbon fibers and other materials are added, so that the problems of mechanical property reduction, fragility and the like of the re-foamed foamed aluminum can be avoided, and the material production cost is reduced; a filling mixture prepared from materials such as silicone rubber, a vulcanizing agent, epoxy resin, an accelerant, a binder, a plasticizer, a dispersing agent, polytetrafluoroethylene, a silane coupling agent, perlite, glass beads with flame-retardant layers loaded on the surfaces, a flame retardant and the like is injected into pores of the foamed aluminum blank block through an injection mold; the sound insulation material for building walls, which is light in weight and more excellent in sound insulation, heat insulation, flame retardance and other performance effects, can be prepared, and is good in mechanical property and higher in structural strength.

Description

Technical Field

[0001] This invention relates to the field of building energy-saving and sound-insulating materials technology, and more specifically, to a foamed aluminum sound-insulating material for building walls and its preparation method. Background Technology

[0002] Aluminum foam is a porous metallic material with lightweight and high specific strength. It also has multiple functions such as sound insulation, heat insulation, flame retardancy, impact energy absorption and electromagnetic shielding, realizing the lightweight and multifunctionality of structural materials. Therefore, it is widely used in the construction industry, such as exterior or interior walls of buildings.

[0003] However, the current method for treating waste aluminum foam is to melt the waste aluminum foam with a flux to remove slag, and then recycle the resulting molten metal for foaming again. However, this method can lead to problems such as a decrease in the strength and plasticity of the aluminum foam, as well as brittleness, which directly affects the sound insulation, heat insulation, and flame retardant properties of the aluminum foam. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a lightweight aluminum foam sound insulation material for building walls with better sound insulation, heat insulation, flame retardant and other performance effects, better mechanical properties and higher structural strength, as well as its preparation method.

[0005] To achieve the above objectives, a first aspect of the present invention provides a method for preparing aluminum foam sound insulation material for building walls, comprising the following steps:

[0006] (1) Preparation of aluminum foam blanks: The collected waste aluminum foam is pretreated to remove impurities and oil stains. After cleaning and drying, 90-95 wt% of waste aluminum foam is placed in a foaming mold and heated to melt. 0.5-1 wt% scandium powder, 0.5-1 wt% magnesium powder, 1-5 wt% titanium hydride and 2-4 wt% carbon fiber are added to the melt. Then, it is heated at 700-1000℃ and kept at the temperature for 10-15 min. After that, inert gas, hydrogen and carbon-containing gas are introduced to deposit a layer of graphene on the pore surface of the foamed aluminum foam blank. After cooling, aluminum foam blanks are obtained.

[0007] (2) Preparation of the filler mixture: 60-70 wt% silicone rubber, 3-10 wt% vulcanizing agent, 5-10 wt% epoxy resin, 1-3 wt% accelerator, 2-5 wt% binder, 1-2 wt% plasticizer, and 2-4 wt% dispersant are heated to a molten state. Then, 0.5-1 wt% polytetrafluoroethylene, 1-3 wt% silane coupling agent, 2-5 wt% perlite, 4-6 wt% glass beads with a flame-retardant layer on the surface, 0.5-0.8 wt% flame retardant, and 0.5-1 wt% pigment are added and mixed evenly to obtain a molten mixture.

[0008] (3) Aluminum-plastic injection molding: The foamed aluminum blank processed in step (1) is placed into the mold cavity of the injection mold, and the molten mixture in step (2) is injected into the pores of the foamed aluminum blank through the injection mold to obtain foamed aluminum sound insulation material for building walls.

[0009] Preferably, the step of surface pretreatment of the collected waste aluminum foam specifically includes:

[0010] The waste aluminum foam is rinsed with hydrochloric acid solution and sodium hydroxide solution in sequence to remove impurities and oil stains, then cleaned with water, and finally dried at a temperature of 80-100℃.

[0011] Preferably, the carbon fiber requires pretreatment before use, including calcination at 200–350°C to remove adhesive, roughening with a polycarbodiimide solution, neutralization with a sodium hydroxide solution, activation with a polyacrylic acid-polyacrylamide solution, and soaking in a sodium hypophosphite solution for 2–5 minutes. The weight ratio of the carbon fiber, polycarbodiimide solution, sodium hydroxide solution, polyacrylic acid-polyacrylamide solution, and sodium hypophosphite solution is 1:(10–15):(8–10):(15–20):(10–15):(10–15).

[0012] Preferably, the surface of the titanium hydride is coated with titanium oxide.

[0013] Preferably, the inert gas is argon, and the carbon-containing gas is methane; the flow rate of the argon is 200-300 sccm, the flow rate of the methane is 10-50 sccm, and the flow rate of the hydrogen is 30-80 sccm.

[0014] Preferably, the vulcanizing agent is 2,4-dichlorobenzoyl peroxide; the accelerator is accelerator DM; the binder is methylcellulose or polyethylene glycol; the plasticizer is stearic acid or palmitoleic acid; and the dispersant is sodium dodecyl sulfate or polyvinylpyrrolidone.

[0015] Preferably, the silane coupling agent is KH550 or KH560; the flame retardant is magnesium hydroxide or aluminum hydroxide.

[0016] Preferably, the glass beads with the flame-retardant layer on their surface have a particle size of 10–80 μm and a true density of 0.25–0.45 g / cm³. 3 The floating rate is ≥91%, and the flame retardant layer is made of aluminum hydroxide or magnesium hydroxide.

[0017] Preferably, the glass beads with the flame-retardant layer loaded on their surface are prepared by the following method:

[0018] Glass beads are placed in a reaction vessel containing a hydrochloric acid solution with a concentration of 0.3–6 mol / L, and the temperature is controlled at 50–90°C. The mixture is stirred for 1–2 hours, then washed with deionized water until neutral and dried to obtain acid-activated glass beads. Aluminum hydroxide or magnesium hydroxide is then loaded onto the acid-activated glass beads by in-situ precipitation to obtain glass beads with a flame-retardant layer on the surface.

[0019] Preferably, in glass beads with a flame-retardant layer on the surface, the weight ratio of aluminum hydroxide or magnesium hydroxide to acid-activated glass beads is (0.1-0.3):1.

[0020] Preferably, the injection pressure of the injection mold is set to 100–180 MPa, and the injection speed is set to 45–80 cm. 3 / s, cooling time set to 1-5min.

[0021] A second aspect of the present invention provides a foamed aluminum sound insulation material for building walls, which is prepared according to the preparation method of the foamed aluminum sound insulation material for building walls described above.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention rationally utilizes waste aluminum foam through secondary foaming, and incorporates materials such as scandium powder, magnesium powder, and carbon fiber. This avoids problems such as decreased mechanical properties and brittleness in re-foamed aluminum foam, reducing material production costs. Furthermore, a filling mixture made from materials such as silicone rubber, vulcanizing agent, epoxy resin, accelerator, binder, plasticizer, dispersant, polytetrafluoroethylene, silane coupling agent, perlite, glass beads with a flame-retardant layer on the surface, and flame retardant is injected into the pores of the aluminum foam preform through an injection mold. This produces a lightweight sound insulation material for building walls with superior sound insulation, heat insulation, and flame retardant properties, as well as better mechanical properties and higher structural strength.

[0024] 2. The present invention deposits a layer of graphene on the pore surface of the foamed aluminum preform, which can improve the bonding strength between the aluminum and plastic interfaces. The filling mixture made of materials such as silicone rubber, vulcanizing agent, epoxy resin, accelerator, binder, plasticizer, dispersant, polytetrafluoroethylene, silane coupling agent, perlite, glass beads with flame-retardant layer on the surface and flame retardant will not delaminate at the interface with the foamed aluminum due to the difference in thermal expansion coefficient.

[0025] 3. Before use, the carbon fiber of the present invention needs to undergo pretreatment in sequence, including burning at 200-350°C to remove glue, roughening with polycarbodiimide solution, neutralization with sodium hydroxide solution, activation with polyacrylic acid-polyacrylamide solution, and soaking in sodium hypophosphite solution. This pretreatment can improve the bonding strength with aluminum foam and give aluminum foam higher mechanical properties.

[0026] 4. The surface of the titanium hydride of the present invention is coated with titanium oxide, so that the titanium hydride will not decompose immediately when added to the foamed aluminum melt, thus delaying the foaming time. It also increases the wettability of titanium hydride and foamed aluminum melt, so that titanium hydride can be more uniformly dispersed in the foamed aluminum melt.

[0027] 5. The glass beads of the present invention have a flame-retardant layer loaded on their surface. This allows for a reduction in the amount of other flame retardants used while maintaining the fire-retardant effect, and further improves the sound insulation, heat insulation, and thermal insulation properties of the material. Furthermore, the flame-retardant layer on the glass beads exhibits good compatibility with the filler mixture, thus providing structural reinforcement to the filler mixture.

[0028] 6. This invention can present a variety of different colors and textures, such as silver-gray and multicolored. The diverse pores generated by foaming can refract light at multiple angles, projecting rich and gorgeous colors. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the surface structure of the foamed aluminum sound insulation material for building walls provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the application of aluminum foam sound insulation material for building walls provided in this embodiment of the invention on the wall. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Embodiment 1 of the present invention provides a foamed aluminum sound insulation material for building walls, which is composed of porous foamed aluminum preforms and a filling mixture injected into the pores of the foamed aluminum preforms.

[0035] The preparation method of the foamed aluminum sound insulation material for the building walls includes the following steps:

[0036] (1) Preparation of aluminum foam blanks: The collected waste aluminum foam is pretreated to remove impurities and oil stains. After cleaning and drying, 90wt% of waste aluminum foam is placed in a foaming mold and heated to melt. 1wt% scandium powder, 1wt% magnesium powder, 5wt% titanium hydride and 3wt% carbon fiber are added to the melt. Then, it is heated at 800℃ and kept at the temperature for 10min. Inert gas, hydrogen and carbon-containing gas are introduced to deposit a layer of graphene on the pore surface of the foamed aluminum foam blank. After cooling, aluminum foam blanks are obtained.

[0037] The specific steps for surface pretreatment of the collected waste aluminum foam include:

[0038] The waste aluminum foam was rinsed with hydrochloric acid solution and sodium hydroxide solution in sequence to remove impurities and oil stains, then cleaned with water, and finally dried at 100°C.

[0039] The surface of the titanium hydride is coated with titanium oxide.

[0040] Before use, the carbon fiber needs to undergo a series of pretreatments: degumming at 200°C, roughening with a polycarbodiimide solution, neutralization with a sodium hydroxide solution, activation with a polyacrylic acid-polyacrylamide solution, and soaking in a sodium hypophosphite solution for 5 minutes. The weight ratio of the carbon fiber, polycarbodiimide solution, sodium hydroxide solution, polyacrylic acid-polyacrylamide solution, and sodium hypophosphite solution is 1:10:8:15:10:10.

[0041] The inert gas is argon, and the carbon-containing gas is methane; the flow rate of the argon is 200 sccm, the flow rate of the methane is 10 sccm, and the flow rate of the hydrogen is 30 sccm.

[0042] (2) Preparation of the filler mixture: 60wt% silicone rubber, 10wt% vulcanizing agent, 5wt% epoxy resin, 3wt% accelerator, 2wt% binder, 1.2wt% plasticizer and 2wt% dispersant are heated to a molten state, and then 1wt% polytetrafluoroethylene, 3wt% silane coupling agent, 5wt% perlite, 6wt% glass beads with flame retardant layer on the surface, 0.8wt% flame retardant and 1wt% pigment are added and mixed evenly to obtain a molten mixture;

[0043] The vulcanizing agent is 2,4-dichlorobenzoyl peroxide; the accelerator is accelerator DM; the binder is methylcellulose; the plasticizer is stearic acid; and the dispersant is sodium dodecyl sulfate.

[0044] The silane coupling agent is KH550; the flame retardant is magnesium hydroxide.

[0045] The glass beads with a flame-retardant layer on their surface have a particle size of 20 μm, a true density of 0.3 g / cm³, and a floatability ≥91%. The flame-retardant layer is aluminum hydroxide. The preparation method of the glass beads with a flame-retardant layer on their surface is as follows:

[0046] Glass beads were placed in a reaction vessel containing a 0.5 mol / L hydrochloric acid solution, the temperature was controlled at 60℃, and the mixture was stirred for 2 hours. Afterward, the beads were washed with deionized water until neutral and dried to obtain acid-activated glass beads. Then, aluminum hydroxide was loaded onto the acid-activated glass beads by in-situ precipitation to obtain glass beads with a flame-retardant layer on the surface.

[0047] In glass beads with a flame-retardant layer on the surface, the weight ratio of aluminum hydroxide to acid-activated glass beads is 0.1:1.

[0048] (3) Aluminum-plastic injection molding: The foamed aluminum blank processed in step (1) is placed into the mold cavity of the injection mold, and the molten mixture in step (2) is injected into the pores of the foamed aluminum blank through the injection mold to obtain foamed aluminum sound insulation material for building walls.

[0049] The injection pressure of the injection mold is set to 100 MPa, and the injection speed is set to 45 cm. 3 / s, cooling time set to 2min.

[0050] Example 2

[0051] Embodiment 2 of the present invention provides a foamed aluminum sound insulation material for building walls, which is composed of porous foamed aluminum preforms and a filling mixture injected into the pores of the foamed aluminum preforms.

[0052] The preparation method of the foamed aluminum sound insulation material for the building walls includes the following steps:

[0053] (1) Preparation of aluminum foam blanks: The collected waste aluminum foam is pretreated to remove impurities and oil stains. After cleaning and drying, 93wt% of waste aluminum foam is placed in a foaming mold and heated to melt. 0.8wt% scandium powder, 0.5wt% magnesium powder, 3wt% titanium hydride and 2.7wt% carbon fiber are added to the melt. Then, it is heated at 900℃ and kept at the temperature for 15min. Inert gas, hydrogen and carbon-containing gas are introduced to deposit a layer of graphene on the pore surface of the foamed aluminum foam blank. After cooling, aluminum foam blanks are obtained.

[0054] The specific steps for surface pretreatment of the collected waste aluminum foam include:

[0055] The waste aluminum foam was rinsed with hydrochloric acid solution and sodium hydroxide solution in sequence to remove impurities and oil stains, then cleaned with water, and finally dried at 90°C.

[0056] The surface of the titanium hydride is coated with titanium oxide.

[0057] Before use, the carbon fiber needs to undergo a series of pretreatments: degumming at 300°C, roughening with a polycarbodiimide solution, neutralization with a sodium hydroxide solution, activation with a polyacrylic acid-polyacrylamide solution, and soaking in a sodium hypophosphite solution for 3 minutes. The weight ratio of the carbon fiber, polycarbodiimide solution, sodium hydroxide solution, polyacrylic acid-polyacrylamide solution, and sodium hypophosphite solution is 1:12:8:16:12:12.

[0058] The inert gas is argon, and the carbon-containing gas is methane; the flow rate of the argon is 250 sccm, the flow rate of the methane is 30 sccm, and the flow rate of the hydrogen is 60 sccm.

[0059] (2) Preparation of the filler mixture: 65wt% silicone rubber, 5wt% vulcanizing agent, 6wt% epoxy resin, 2wt% accelerator, 3.5wt% binder, 1.5wt% plasticizer and 4wt% dispersant are heated to a molten state, and then 0.5wt% polytetrafluoroethylene, 3wt% silane coupling agent, 3wt% perlite, 5wt% glass beads with flame retardant layer on the surface, 0.5wt% flame retardant and 1wt% pigment are added and mixed evenly to obtain a molten mixture;

[0060] The vulcanizing agent is 2,4-dichlorobenzoyl peroxide; the accelerator is accelerator DM; the binder is polyethylene glycol; the plasticizer is palmitoleic acid; and the dispersant is polyvinylpyrrolidone.

[0061] The silane coupling agent is KH560; the flame retardant is aluminum hydroxide.

[0062] The glass beads with a flame-retardant layer on their surface have a particle size of 50 μm and a true density of 0.35 g / cm³. 3 The floating rate is ≥91%, and the flame retardant layer is made of aluminum hydroxide.

[0063] The method for preparing the glass beads with a flame-retardant layer loaded on the surface is as follows:

[0064] Glass beads were placed in a reaction vessel containing a 2 mol / L hydrochloric acid solution, the temperature was controlled at 90℃, and the mixture was stirred for 1 hour. Afterward, the beads were washed with deionized water until neutral and dried to obtain acid-activated glass beads. Then, aluminum hydroxide was loaded onto the acid-activated glass beads by in-situ precipitation to obtain glass beads with a flame-retardant layer on the surface.

[0065] In glass beads with a flame-retardant layer on the surface, the weight ratio of aluminum hydroxide to acid-activated glass beads is 0.2:1.

[0066] (3) Aluminum-plastic injection molding: The foamed aluminum blank processed in step (1) is placed into the mold cavity of the injection mold, and the molten mixture in step (2) is injected into the pores of the foamed aluminum blank through the injection mold to obtain foamed aluminum sound insulation material for building walls.

[0067] The injection pressure of the injection mold is set to 150 MPa, and the injection speed is set to 60 cm. 3 / s, cooling time is set to 1min.

[0068] Example 3

[0069] Embodiment 3 of the present invention provides a foamed aluminum sound insulation material for building walls, which is composed of porous foamed aluminum preforms and a filling mixture injected into the pores of the foamed aluminum preforms.

[0070] The preparation method of the foamed aluminum sound insulation material for the building walls includes the following steps:

[0071] (1) Preparation of aluminum foam blanks: The collected waste aluminum foam is pretreated to remove impurities and oil stains. After cleaning and drying, 95wt% of waste aluminum foam is placed in a foaming mold and heated to melt. 0.5wt% scandium powder, 0.5wt% magnesium powder, 1wt% titanium hydride and 3wt% carbon fiber are added to the melt. Then, it is heated at 1000℃ and kept at the temperature for 15min. Inert gas, hydrogen and carbon-containing gas are introduced to deposit a layer of graphene on the pore surface of the foamed aluminum foam blank. After cooling, aluminum foam blanks are obtained.

[0072] The specific steps for surface pretreatment of the collected waste aluminum foam include:

[0073] The waste aluminum foam was rinsed with hydrochloric acid solution and sodium hydroxide solution in sequence to remove impurities and oil stains, then cleaned with water, and finally dried at 100°C.

[0074] The surface of the titanium hydride is coated with titanium oxide.

[0075] Before use, the carbon fiber needs to undergo a series of pretreatments: degumming at 350°C, roughening with a polycarbodiimide solution, neutralization with a sodium hydroxide solution, activation with a polyacrylic acid-polyacrylamide solution, and soaking in a sodium hypophosphite solution for 5 minutes. The weight ratio of the carbon fiber, polycarbodiimide solution, sodium hydroxide solution, polyacrylic acid-polyacrylamide solution, and sodium hypophosphite solution is 1:15:10:20:15:15.

[0076] The inert gas is argon, and the carbon-containing gas is methane; the flow rate of the argon is 300 sccm, the flow rate of the methane is 50 sccm, and the flow rate of the hydrogen is 80 sccm.

[0077] (2) Preparation of the filler mixture: 70wt% silicone rubber, 10wt% vulcanizing agent, 5wt% epoxy resin, 1wt% accelerator, 2wt% binder, 1wt% plasticizer and 2wt% dispersant are heated to a molten state, and then 1wt% polytetrafluoroethylene, 1wt% silane coupling agent, 2wt% perlite, 4wt% glass beads with flame retardant layer on the surface, 0.5wt% flame retardant and 0.5wt% pigment are added and mixed evenly to obtain a molten mixture;

[0078] The vulcanizing agent is 2,4-dichlorobenzoyl peroxide; the accelerator is accelerator DM; the binder is methylcellulose; the plasticizer is palmitoleic acid; and the dispersant is sodium dodecyl sulfate.

[0079] The silane coupling agent is KH550; the flame retardant is magnesium hydroxide.

[0080] The glass beads with a flame-retardant layer on their surface have a particle size of 30 μm and a true density of 0.45 g / cm³. 3 The floating rate is ≥91%, and the flame retardant layer is made of magnesium hydroxide.

[0081] The method for preparing the glass beads with a flame-retardant layer loaded on the surface is as follows:

[0082] Glass beads were placed in a reaction vessel containing a 6 mol / L hydrochloric acid solution, the temperature was controlled at 90℃, and the mixture was stirred for 1 hour. Afterward, the beads were washed with deionized water until neutral and dried to obtain acid-activated glass beads. Then, aluminum hydroxide or magnesium hydroxide was loaded onto the acid-activated glass beads by in-situ precipitation to obtain glass beads with a flame-retardant layer on the surface.

[0083] In glass beads with a flame-retardant layer on the surface, the weight ratio of aluminum hydroxide or magnesium hydroxide to acid-activated glass beads is 0.3:1.

[0084] (3) Aluminum-plastic injection molding: The foamed aluminum blank processed in step (1) is placed into the mold cavity of the injection mold, and the molten mixture in step (2) is injected into the pores of the foamed aluminum blank through the injection mold to obtain foamed aluminum sound insulation material for building walls.

[0085] The injection pressure of the injection mold is set to 180 MPa, and the injection speed is set to 80 cm. 3 / s, cooling time is set to 1min.

[0086] The performance of the foamed aluminum sound insulation materials for building walls prepared in Examples 1-3 was tested according to the following test methods:

[0087] 1. Material tensile strength test: The test shall be conducted in accordance with standard GB / T 228.1-2021;

[0088] 2. Measure the thermal conductivity of the material: Test according to standard GB / T 10295-2008;

[0089] 3. Fire resistance performance test: Tested according to standard GB / T 8624-2012;

[0090] 4. Sound insulation effect test: The test shall be conducted in accordance with the standard GB / T 6881.2-2017.

[0091] The test results are as follows:

[0092] Table 1: Test Data

[0093]

[0094] As can be seen from Table 1, the present invention can produce a lightweight sound insulation material for building walls with superior sound insulation, heat insulation, and flame retardant properties, as well as good mechanical properties and higher structural strength.

[0095] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for preparing foamed aluminum sound insulation material for building walls, characterized in that, Includes the following steps: (1) Preparation of aluminum foam blanks: The collected waste aluminum foam is pretreated to remove impurities and oil stains. After cleaning and drying, 90-95 wt% of waste aluminum foam is placed in a foaming mold and heated to melt. 0.5-1 wt% scandium powder, 0.5-1 wt% magnesium powder, 1-5 wt% titanium hydride and 2-4 wt% carbon fiber are added to the melt. Then, it is heated at 700-1000℃ and kept at the temperature for 10-15 min. After that, inert gas, hydrogen and carbon-containing gas are introduced to deposit a layer of graphene on the pore surface of the foamed aluminum foam blank. After cooling, aluminum foam blanks are obtained. (2) Preparation of the filler mixture: 60-70 wt% silicone rubber, 3-10 wt% vulcanizing agent, 5-10 wt% epoxy resin, 1-3 wt% accelerator, 2-5 wt% binder, 1-2 wt% plasticizer, and 2-4 wt% dispersant are heated to a molten state. Then, 0.5-1 wt% polytetrafluoroethylene, 1-3 wt% silane coupling agent, 2-5 wt% perlite, 4-6 wt% glass beads with a flame-retardant layer on the surface, 0.5-0.8 wt% flame retardant, and 0.5-1 wt% pigment are added and mixed evenly to obtain a molten mixture. (3) Aluminum-plastic injection molding: The foamed aluminum blank processed in step (1) is placed into the mold cavity of the injection mold, and the molten mixture in step (2) is injected into the pores of the foamed aluminum blank through the injection mold to obtain foamed aluminum sound insulation material for building walls.

2. The method for preparing a foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, The specific steps for surface pretreatment of the collected waste aluminum foam include: The waste aluminum foam is rinsed with hydrochloric acid solution and sodium hydroxide solution in sequence to remove impurities and oil stains, then cleaned with water, and finally dried at a temperature of 80-100℃.

3. The method for preparing foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, Before use, the carbon fiber needs to undergo a series of pretreatments, including burning at 200-350°C to remove the adhesive, roughening with a polycarbodiimide solution, neutralization with a sodium hydroxide solution, activation with a polyacrylic acid-polyacrylamide solution, and soaking in a sodium hypophosphite solution for 2-5 minutes.

4. The method for preparing a foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, The surface of the titanium hydride is coated with titanium oxide.

5. The method for preparing a foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, The inert gas is argon, and the carbon-containing gas is methane; the flow rate of the argon is 200–300 sccm, the flow rate of the hydrogen is 30–80 sccm, and the flow rate of the methane is 10–50 sccm.

6. The method for preparing a foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, The vulcanizing agent is 2,4-dichlorobenzoyl peroxide; the accelerator is accelerator DM; the binder is methylcellulose or polyethylene glycol; the plasticizer is stearic acid or palmitoleic acid; and the dispersant is sodium dodecyl sulfate or polyvinylpyrrolidone.

7. The method for preparing a foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, The silane coupling agent is KH550 or KH560; the flame retardant is magnesium hydroxide or aluminum hydroxide.

8. The method for preparing a foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, The glass beads with a flame-retardant layer on their surface have a particle size of 10–80 μm and a true density of 0.25–0.45 g / cm³. 3 The floating rate is ≥91%, and the flame retardant layer is made of aluminum hydroxide or magnesium hydroxide.

9. A method for preparing a foamed aluminum sound insulation material for building walls according to claim 1, characterized in that, The injection pressure of the injection mold is set to 100–180 MPa, and the injection speed is set to 45–80 cm. 3 / s, cooling time set to 1-5min.

10. A foamed aluminum sound insulation material for building walls, characterized in that, It is prepared by the method of any one of claims 1 to 9 for the preparation of a foamed aluminum sound insulation material for building walls.

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