A high-strength fireproof aluminum composite panel and its preparation method and application

Abstract

The present invention relates to a high-strength fireproof aluminum composite panel and its preparation method and application. The composite panel is sequentially provided with an aluminum alloy panel, a first adhesive layer, a functional core layer, a second adhesive layer, and an aluminum alloy substrate from top to bottom; wherein the functional core layer includes an aluminum honeycomb core panel and a filler arranged in the honeycomb core panel cavity structure, and the filler is formed by solidifying a slurry, wherein the slurry includes the following raw materials in weight percentage: 10-20% expandable graphite, 10-20% modified aerogel particles, 10-20% composite resin, and 2-5% curing agent, with the balance being a solvent; wherein the composite resin is bisphenol A phenolic resin, epoxy-modified acrylic resin, and polysilazane resin. The aluminum composite panel of the present invention has good high strength, lightweight, sound insulation, and heat insulation effects.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum composite panels, and in particular to a high-strength fireproof aluminum composite panel and a preparation method and application thereof. Background Art

[0002] In recent years, society has placed increasingly stringent demands on the performance of building materials. In the interior design field, demand for lightweight, high-strength, and environmentally friendly materials has seen rapid growth. Among numerous building materials, aluminum honeycomb core panels, with their unique structural design, lightweight advantages, and excellent strength, have rapidly become a popular choice in the construction and interior decoration fields.

[0003] Aluminum honeycomb panels feature a unique structure, consisting of an aluminum honeycomb core and two thin aluminum sheets, creating a lightweight composite material. This innovative design gives the panels an exceptional strength-to-weight ratio and high rigidity, while also exhibiting excellent thermal and acoustic insulation and weather resistance. Their application in the construction industry not only improves construction efficiency but also meets the current demand for diverse material properties.

[0004] However, in cold northern regions, aluminum honeycomb panels face even higher demands for thermal insulation. As people's pursuit of living comfort continues to increase, aluminum honeycomb panels need to further optimize their thermal insulation performance in extreme cold environments to better meet the material requirements of buildings in cold regions. Furthermore, aluminum honeycomb panels readily absorb moisture after rainy or humid weather, creating conditions for microbial growth and, in turn, impacting environmental hygiene. Therefore, during the design and application of the material, it is necessary to consider how to further enhance the moisture-proof and antimicrobial properties of aluminum honeycomb panels to comprehensively improve their environmental hygiene performance. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high-strength fireproof aluminum composite panel and its preparation method and application.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a high-strength fireproof aluminum composite panel, wherein the composite panel is provided with an aluminum alloy face plate, a first adhesive layer, a functional core layer, a second adhesive layer, and an aluminum alloy substrate in order from top to bottom; wherein the functional core layer includes an aluminum honeycomb core panel and a filler provided in a cavity structure of the aluminum honeycomb core panel, wherein the filler is formed by curing a slurry, wherein the slurry includes the following raw materials in weight percentage: 10-20% expandable graphite, 10-20% modified aerogel particles, 10-20% composite resin, 2-5% curing agent, and the balance is solvent, wherein the composite resin is bisphenol A phenolic resin, epoxy-modified acrylic resin, and polysilazane resin;

[0008] The preparation method of the modified aerogel particles comprises the following steps: soaking the aerogel particles in a solution containing a silane modifier, taking out the aerogel particles, and drying the aerogel particles to obtain the modified aerogel particles.

[0009] In this invention, if the cavity structure of the aluminum honeycomb core panel is not filled, air convection will significantly increase heat transfer (especially in high-temperature environments), resulting in poor thermal insulation performance of the aluminum composite panel. Therefore, this invention injects a filler into the cavity structure of the aluminum honeycomb core panel. After the filler cures, it completely fills the honeycomb pores, resulting in the aluminum composite panel having excellent thermal and sound insulation effects. The technical principle is as follows:

[0010] Modified aerogel particles have high porosity and low thermal conductivity. They form a three-dimensional nanoporous network within the honeycomb core, reducing heat convection by inhibiting the free path of gas molecules. Silane modifiers strengthen the interfacial bonding between the aerogel particles and the resin, preventing pore collapse. Expandable graphite can expand by 150-300 times its volume at high temperatures (>300°C), forming a "worm-like" char layer that blocks oxygen diffusion and reflects infrared radiation, slowing the spread of flames. Expandable graphite also diffuses localized heat laterally, preventing heat accumulation and reducing the proportion of radiative heat transfer. Bisphenol A phenolic resin carbonizes at high temperatures to form a porous char layer (oxygen barrier). Polysilazane resin forms a Si-O-Si ceramic layer at high temperatures (>500°C). This layer, combined with the porous char layer, forms a double thermal insulation barrier, inhibiting high-temperature heat conduction pathways. This synergistically improves high-temperature stability and ensures the integrity of the insulation layer during the initial stages of a fire.

[0011] The nanopores (2-50 nm) contained in the modified aerogel particles absorb high-frequency sound waves (2000-6000 Hz), the micron-sized gaps in the expandable graphite attenuate mid-frequency sounds (500-2000 Hz), and the honeycomb cavities suppress low-frequency resonances (<500 Hz). The high damping properties of the epoxy-modified acrylic resin convert sound energy into heat, while the rigidity of the bisphenol A phenolic resin and the flexible chain segments of the epoxy-modified acrylic resin synergistically optimize acoustic impedance and reduce reflection losses.

[0012] Modified aerogel particles serve as reinforcing fillers in the functional core layer. After silanization, organic functional groups from the silane modifier are introduced onto the surface of the aerogel particles. These organic functional groups can chemically react with molecules in the composite resin (such as the epoxy groups in the epoxy-modified acrylic resin) or form hydrogen bonds. Specifically, the amino groups of the silane modifier react with the epoxy groups in the epoxy-modified acrylic resin to form chemical bonds, strengthening the interfacial bonding between the aerogel particles and the composite resin, thereby improving their compatibility. When the aerogel and composite resin exhibit good compatibility, the aerogel particles can be more evenly dispersed within the composite resin matrix. This uniform dispersion ensures that external forces are evenly transferred to the aerogel particles and the composite resin, fully maximizing the thermal and sound insulation properties of the aerogel particles. Furthermore, good compatibility reduces interfacial defects such as voids and delamination, which are often key factors that reduce the thermal and sound insulation performance of a material.

[0013] Preferably, the mass ratio of the bisphenol A novolac resin, the epoxy-modified acrylic resin and the polysilazane resin is 1:(1.5-3):(0.5-1).

[0014] Preferably, the curing agent is triethylenetetramine, hexamethylenetetramine, and 1,3-propylene glycol bis(4-aminobenzoate) in a mass ratio of 1:(0.5-2):(0.5-2). These three ingredients, triethylenetetramine, hexamethylenetetramine, and 1,3-propylene glycol bis(4-aminobenzoate), can synergistically enhance the curing reaction efficiency and interfacial bonding strength between the composite resin and the modified aerogel particles, thereby improving the mechanical strength, thermal insulation, and sound insulation of the aluminum composite panel.

[0015] Preferably, the solvent is dichloromethane, ethanol and tetrahydrofuran in a mass ratio of 1:(1-2):(1-2).

[0016] Preferably, the materials of the aluminum honeycomb core panel, the aluminum alloy panel and the aluminum alloy substrate are all aluminum alloy 3003.

[0017] Preferably, in the preparation method of the modified aerogel particles, the aerogel particles are immersed in a solution containing a silane modifier of 3-4 times their mass, the solvent of the solution containing the silane modifier is n-hexane, the volume concentration of the solution containing the silane modifier is 60-70%, and the immersion time is 12-24h.

[0018] Preferably, the aerogel particles are silica aerogel particles, and the silane modifier is at least one of KH550, KH560 and KH570.

[0019] Preferably, the aluminum honeycomb core panel is an aluminum alloy material with a cross-section of regular hexagonal channels connected around the periphery, the side length of the regular hexagonal channels is 6-8 mm, the wall thickness is 0.15-0.3 mm, and the thickness of the aluminum honeycomb core panel is 15-30 mm; after the slurry is injected into the cavity structure of the aluminum honeycomb core panel and baked and solidified to form the filler, the aluminum honeycomb core panel gains weight by 16±1%.

[0020] In a second aspect, the present invention provides a method for preparing the high-strength fireproof aluminum composite panel described in the first aspect, comprising the following steps:

[0021] (1) Cutting the aluminum alloy panel and the aluminum alloy substrate into predetermined sizes, cleaning them, and obtaining pre-treated aluminum alloy panels and aluminum alloy substrates;

[0022] (2) spraying an adhesive on the upper surface of the pretreated aluminum alloy substrate and curing the adhesive to form a second adhesive layer;

[0023] (3) The modified aerogel particles, expandable graphite, composite resin, curing agent and solvent are stirred and mixed to form a slurry, the slurry is injected into the cavity structure of the aluminum honeycomb core panel, and the slurry is baked and cured. After the filler is formed in the cavity structure of the aluminum honeycomb core panel, the functional core layer is obtained, and the lower surface of the functional core layer is bonded to the second adhesive layer and pressurized and cured;

[0024] (4) Coating an adhesive on the lower surface of the aluminum alloy panel to form a first adhesive layer, which is then combined with the upper surface of the functional core layer and cured to obtain the high-strength fireproof aluminum composite panel.

[0025] Preferably, in step (2) and step (4), the curing temperature is 80-90° C., and the curing time is 20-40 min.

[0026] Preferably, in step (2) and step (4), the adhesive is a hot-melt epoxy resin adhesive.

[0027] Preferably, in step (3), the stirring speed is 500-600 rpm and the stirring mixing time is 20-30 min.

[0028] Preferably, in step (3), the pressure of pressurized curing is 25-35 MPa, the temperature is 100-150° C., and the time is 10-20 min.

[0029] In a third aspect, the present invention provides a use of the high-strength fireproof aluminum composite panel described in the first aspect or the second aspect in the preparation of a building panel.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The functional core layer of the present invention comprises an aluminum honeycomb core panel and a filler disposed within the cavity structure of the aluminum honeycomb core panel. In addition to the inherent fireproofing, corrosion resistance, and lightweight properties of the honeycomb structure, it also further enhances the thermal insulation and sound absorption properties of the functional core layer. The porous structure of the modified aerogel particles in the filler reduces thermal conductivity, improving thermal insulation. After curing, the modified aerogel particles, expandable graphite, and resin are filled into the pores of the aluminum honeycomb core panel, blocking the path of acoustic and thermal transfer. The porous system of the modified aerogel particles also absorbs acoustic wave energy, while the composite resin forms a damping structure to reduce vibration, synergistically enhancing the sound and thermal insulation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a structural diagram of the aluminum composite panel of the present invention;

[0033] In the figure: 1. Aluminum alloy panel; 2. First bonding layer; 3. Functional core layer; 4. Second bonding layer; 5. Aluminum alloy substrate. DETAILED DESCRIPTION

[0034] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0035] The sources of materials for the following examples and comparative examples are as follows:

[0036] Bisphenol A phenolic resin: the manufacturer is Dongguan Kaixili Plastic Raw Materials Co., Ltd., the brand is high-strength PSF;

[0037] Epoxy modified acrylic resin: manufacturer is Ruisheng New Materials Co., Ltd., model number is RV-1001A;

[0038] Polysilazane resin: manufacturer is Shandong Kaiyue Chemical Co., Ltd., model number is OPZ-115;

[0039] 1,3-Propanediol bis(4-aminobenzoate): manufacturer: Zouping Tongfeng Chemical Co., Ltd., model: TFC-740M;

[0040] Silica aerogel particles: manufactured by Namat New Material Technology Co., Ltd., model number SiliPorous;

[0041] Hot-melt epoxy resin adhesive: manufactured by Henkel, model LOCTITE G 500;

[0042] Expandable graphite: The manufacturer is Qingdao Henglide Graphite Co., Ltd., the model is DL50, and the expansion rate is 300-350%.

[0043] Unless otherwise specified, other materials, reagents, etc. used in the Examples and Comparative Examples can be obtained from commercial sources.

[0044] Example 1

[0045] A high strength fireproof aluminum composite panel, such as Figure 1 As shown, the composite panel is provided with an aluminum alloy panel 1, a first adhesive layer 2, a functional core layer 3, a second adhesive layer 4 and an aluminum alloy substrate 5 in order from top to bottom; the thickness of the aluminum alloy panel 1 and the aluminum alloy substrate 5 are both 5 mm, the thickness of the functional core layer 3 is 10 mm, and the thickness of the first adhesive layer 2 and the second adhesive layer 3 are both 5 mm;

[0046] The functional core layer 3 includes an aluminum honeycomb core panel and a filler disposed in the cavity structure of the aluminum honeycomb core panel. The filler is formed by curing a slurry. The slurry includes the following raw materials in weight percentages: 17% expandable graphite, 15% modified aerogel particles, 12% composite resin, 3% curing agent, and the balance is solvent.

[0047] The preparation method of the modified aerogel particles comprises the following steps:

[0048] The silica aerogel particles were immersed in a solution containing 3.5 times the amount of KH550, taken out after 18 hours, and dried to obtain the modified aerogel particles, wherein the solvent of the solution was n-hexane, and the volume concentration of the solution was 65%;

[0049] The composite resin is bisphenol A phenolic resin, epoxy modified acrylic resin and polysilazane resin in a mass ratio of 1:2:0.6;

[0050] The curing agent is triethylenetetramine, hexamethylenetetramine and 1,3-propylene glycol bis(4-aminobenzoate) in a mass ratio of 1:1.5:1.2;

[0051] The solvent is dichloromethane, ethanol and tetrahydrofuran in a mass ratio of 1:1.5:1;

[0052] The method for preparing the high-strength fireproof aluminum composite panel comprises the following steps:

[0053] (1) Cutting the aluminum alloy panel 1 and the aluminum alloy substrate 5 into predetermined sizes and cleaning them to obtain pre-treated aluminum alloy panel 1 and aluminum alloy substrate 5;

[0054] (2) spraying an adhesive on the upper surface of the pretreated aluminum alloy substrate 5 and curing it at 85° C. for 30 minutes to form a second adhesive layer 4;

[0055] (3) The modified aerogel particles, expandable graphite, composite resin, curing agent and solvent were stirred and mixed at a rotation speed of 550 rpm for 25 minutes to obtain the slurry, and the slurry was injected into the cavity structure of the aluminum honeycomb core panel. After baking and curing at 85°C for 30 minutes, a filler was formed in the cavity structure of the aluminum honeycomb core panel, and the aluminum honeycomb core panel increased in weight by 16% to obtain the functional core layer 3. The lower surface of the functional core layer 3 was bonded to the second adhesive layer 4, and pressurized and cured at 30 MPa and 120°C for 15 minutes;

[0056] (4) coating the lower surface of the aluminum alloy panel 1 with an adhesive to form a first adhesive layer 2, which is then bonded to the upper surface of the functional core layer 3 and cured at 85° C. for 30 minutes to obtain the high-strength fireproof aluminum composite panel;

[0057] The aluminum honeycomb core panel is made of an aluminum alloy material with a cross-section of regular hexagonal channels connected around the periphery. The side length of the regular hexagonal channels is 7 mm and the wall thickness is 0.2 mm. The aluminum honeycomb core panel, aluminum alloy panel 1 and aluminum alloy substrate 5 are all made of aluminum alloy 3003, and the adhesives are all hot-melt epoxy resin adhesives.

[0058] Example 2

[0059] A high strength fireproof aluminum composite panel, such as Figure 1 As shown, the composite panel is provided with an aluminum alloy panel 1, a first adhesive layer 2, a functional core layer 3, a second adhesive layer 4 and an aluminum alloy substrate 5 in order from top to bottom; the thickness of the aluminum alloy panel 1 and the aluminum alloy substrate 5 is 5 mm, the thickness of the functional core layer 3 is 10 mm, and the thickness of the first adhesive layer 2 and the second adhesive layer 4 is 5 mm;

[0060] The functional core layer 3 includes an aluminum honeycomb core panel and a filler provided in the cavity structure of the aluminum honeycomb core panel. The filler is formed by curing a slurry. The raw materials for preparing the slurry include the following raw materials in weight percentage: 10% expandable graphite, 20% modified aerogel particles, 20% composite resin, 5% curing agent, and the balance is solvent.

[0061] The preparation method of the modified aerogel particles comprises the following steps:

[0062] The silica aerogel is immersed in a solution containing KH550 in a volume of 4 times the amount, taken out after 24 hours, and dried to obtain the modified aerogel particles, wherein the solvent of the solution is n-hexane, and the volume concentration of the solution is 70%;

[0063] The composite resin is bisphenol A phenolic resin, epoxy modified acrylic resin and polysilazane resin in a mass ratio of 1:3:1;

[0064] The curing agent is triethylenetetramine, hexamethylenetetramine and 1,3-propylene glycol bis(4-aminobenzoate) in a mass ratio of 1:0.5:0.5, and the solvent is dichloromethane, ethanol and tetrahydrofuran in a mass ratio of 1:2:2;

[0065] The method for preparing the high-strength fireproof aluminum composite panel comprises the following steps:

[0066] (1) Cutting the aluminum alloy panel 1 and the aluminum alloy substrate 5 into predetermined sizes and cleaning them to obtain pre-treated aluminum alloy panel 1 and aluminum alloy substrate 5;

[0067] (2) spraying an adhesive on the upper surface of the pretreated aluminum alloy substrate 1 and curing it at 90° C. for 20 minutes to form a second adhesive layer 4;

[0068] (3) The modified aerogel particles, expandable graphite, composite resin, curing agent and solvent were stirred and mixed at a rotation speed of 500 rpm for 30 minutes to obtain the slurry, and the slurry was made into a slurry. The slurry was injected into the cavity structure of the aluminum honeycomb core panel, and cured at 90° C. for 20 minutes to form a filler in the cavity structure of the aluminum honeycomb core panel. The aluminum honeycomb core panel increased in weight by 17% to obtain the functional core layer 3. The lower surface of the functional core layer 3 was bonded to the second adhesive layer 4, and pressurized and cured at a pressure of 25 MPa and 100° C. for 20 minutes;

[0069] (4) coating the lower surface of the aluminum alloy panel 1 with an adhesive to form a first adhesive layer 2, which is then bonded to the upper surface of the functional core layer 3 and cured at 90° C. for 20 minutes to obtain the high-strength fireproof aluminum composite panel;

[0070] The aluminum honeycomb core is an aluminum alloy material with a cross-section of regular hexagonal channels connected around the periphery. The side length of the regular hexagonal channels is 8 mm and the thickness is 0.3 mm. The materials of the aluminum honeycomb core panel, aluminum alloy panel 1 and aluminum alloy substrate 5 are all aluminum alloy 3003, and the adhesive is a hot-melt epoxy resin adhesive.

[0071] Example 3

[0072] A high strength fireproof aluminum composite panel, such as Figure 1 As shown, the composite panel is provided with an aluminum alloy panel 1, a first adhesive layer 2, a functional core layer 3, a second adhesive layer 4 and an aluminum alloy substrate 5 in order from top to bottom; the thickness of the aluminum alloy panel 1 and the aluminum alloy substrate 5 is 5 mm, the thickness of the functional core layer 3 is 10 mm, and the thickness of the first adhesive layer 2 and the second adhesive layer 4 is 5 mm;

[0073] The functional core layer 3 includes an aluminum honeycomb core panel and a filler arranged in the cavity structure of the aluminum honeycomb core panel. The filler is formed by curing a slurry. The raw materials for preparing the slurry include the following raw materials in weight percentage: 20% expandable graphite, 10% modified aerogel particles, 10% composite resin, 2% curing agent, and the balance is solvent.

[0074] The preparation method of the modified aerogel particles comprises the following steps:

[0075] The silica aerogel particles were immersed in a solution containing 3 times the amount of KH570, taken out after 18 hours, and dried to obtain the modified aerogel particles, wherein the solvent of the solution was n-hexane, and the volume concentration of the solution was 65%;

[0076] The composite resin is bisphenol A phenolic resin, epoxy modified acrylic resin and polysilazane resin in a mass ratio of 1:1.5:0.5;

[0077] The curing agent is triethylenetetramine, hexamethylenetetramine and 1,3-propylene glycol bis(4-aminobenzoate) in a mass ratio of 1:0.5:0.5, and the solvent is dichloromethane, ethanol and tetrahydrofuran in a mass ratio of 1:1:1;

[0078] The preparation method of the high-strength fireproof aluminum composite panel comprises the following steps:

[0079] (1) Cutting the aluminum alloy panel 1 and the aluminum alloy substrate 5 into predetermined sizes and cleaning them to obtain pre-treated aluminum alloy panel 1 and aluminum alloy substrate 5;

[0080] (2) spraying an adhesive on the upper surface of the pretreated aluminum alloy substrate 1 and curing it at 80° C. for 40 minutes to form a second adhesive layer 4;

[0081] (3) The modified aerogel particles, expandable graphite, composite resin, curing agent and solvent were stirred and mixed at a rotation speed of 600 rpm for 20 minutes to obtain the slurry, and the slurry was injected into the cavity structure of the aluminum honeycomb core panel. After baking and curing at 80°C for 40 minutes, a filler was formed in the cavity structure of the aluminum honeycomb core panel, and the aluminum honeycomb core panel increased in weight by 15% to obtain the functional core layer 3. The lower surface of the functional core layer 3 was bonded to the second adhesive layer 4, and pressurized and cured at a pressure of 35 MPa and 150°C for 10 minutes;

[0082] (4) coating the lower surface of the aluminum alloy panel 1 with an adhesive to form a first adhesive layer 2, which is then bonded to the upper surface of the functional core layer 3 and cured at 80° C. for 40 minutes to obtain the high-strength fireproof aluminum composite panel;

[0083] The aluminum honeycomb core panel is an aluminum alloy material with a cross-section of regular hexagonal channels connected around the periphery. The side length of the regular hexagonal channels is 6 mm and the thickness is 0.15 mm. The materials of the aluminum honeycomb core panel, aluminum alloy panel 1 and aluminum alloy substrate 5 are all aluminum alloy 3003, and the adhesives are all hot-melt epoxy resin adhesives.

[0084] Example 4

[0085] The difference between Example 4 and Example 1 is that the amount of curing agent added to the slurry remains unchanged, triethylenetetramine is not added, and hexamethylenetetramine and 1,3-propylene glycol bis(4-aminobenzoate) in a mass ratio of 1.5:1.2 are selected to make up the missing amount.

[0086] Example 5

[0087] The difference between Example 5 and Example 1 is that the amount of curing agent added to the slurry remains unchanged, hexamethylenetetramine is not added, and triethylenetetramine 1,3-propylene glycol bis(4-aminobenzoate) with a mass ratio of 1:1.5 is selected to make up for the missing amount.

[0088] Example 6

[0089] The difference between Example 6 and Example 1 is that the amount of curing agent added to the slurry remains unchanged, 1,3-propylene glycol bis(4-aminobenzoate) is not added, and triethylenetetramine and hexamethylenetetramine with a mass ratio of 1:1.5 are selected to make up for the missing amount.

[0090] Comparative Example 1

[0091] The difference between Comparative Example 1 and Example 1 is that the amount of composite resin added to the slurry remains unchanged, bisphenol A phenolic resin is not added, and the missing amount is made up by epoxy-modified acrylic resin and polysilazane resin in a mass ratio of 1:0.3.

[0092] Comparative Example 2

[0093] The difference between Comparative Example 2 and Example 1 is that the amount of composite resin added to the slurry remains unchanged, epoxy-modified acrylic resin is not added, and bisphenol A phenolic resin and polysilazane resin with a mass ratio of 1:0.6 are used to make up for the missing amount.

[0094] Comparative Example 3

[0095] The difference between Comparative Example 3 and Example 1 is that the amount of composite resin added to the slurry remains unchanged, no polysilazane resin is added, and bisphenol A phenolic resin and epoxy-modified acrylic resin in a mass ratio of 1:2 are used to make up for the missing amount.

[0096] Comparative Example 4

[0097] The difference between Comparative Example 4 and Example 1 is that the aerogel particles are not subjected to silanization treatment.

[0098] Performance Testing

[0099] The composite panels of Examples 1-6 and Comparative Examples 1-4 were tested as follows. The test results are shown in Table 1:

[0100] Thermal conductivity: measured in accordance with GB / T 10294-2008 "Insulation materials - Determination of steady-state thermal resistance and related properties - Guarded hot plate method";

[0101] Sound insulation: measured in accordance with the standard GB / T19889.3-2005 "Acoustic buildings and building elements sound insulation measurement Part 3: Laboratory measurement of airborne sound insulation of building elements";

[0102] Tensile strength: measured in accordance with the standard JG / T287-2013 "Insulation decorative panels for exterior wall insulation systems";

[0103] Table 1 Test results of each group of composite board samples

[0104] Group Tensile strength / MPa Thermal conductivity W / (m·K) Sound insulation / dB Example 1 263 0.049 40 Example 2 250 0.049 42 Example 3 259 0.047 41 Example 4 220 0.055 36 Example 5 211 0.058 35 Example 6 214 0.062 33 Comparative Example 1 152 0.132 20 Comparative Example 2 148 0.129 23 Comparative Example 3 155 0.136 19 Comparative Example 4 171 0.088 23

[0105] As shown in Table 1, combined with the data from Examples 1 and 4-6, the mechanical strength, sound insulation, and thermal insulation of the aluminum composite panel are reduced when triethylenetetramine, hexamethylenetetramine, and 1,3-propylene glycol bis(4-aminobenzoate) are absent from the curing agent. This is likely because polyamine curing agents such as triethylenetetramine and hexamethylenetetramine react with the epoxy groups in the epoxy-modified acrylic resin to form a three-dimensional cross-linked network. This cross-linked network effectively encapsulates the aerogel particles and forms strong chemical bonds with the siloxane groups on the aerogel particles' surfaces, resulting in a more cohesive structure for the entire filling layer. The presence of 1,3-propylene glycol bis(4-aminobenzoate) further enhances the stability of the cross-linked network. The benzene rings and ester groups in its molecular structure interact with the siloxane groups in the polysilazane resin, making the cross-linked network more compact and stable. This allows the core layer to better distribute stress when subjected to external forces, improving the composite panel's mechanical properties, such as compressive and flexural strength. Therefore, the three components of triethylenetetramine, hexamethylenetetramine and 1,3-propylene glycol bis(4-aminobenzoate) can synergistically improve the curing reaction efficiency and interface bonding strength of the resin and aerogel, thereby improving the mechanical strength, sound insulation and thermal insulation effects of the aluminum composite panel.

[0106] Combining the data of Example 1 and Comparative Examples 1-3, it can be seen that when one of the bisphenol A phenolic resin, epoxy-modified acrylic resin, and polysilazane resin in the composite resin is missing, the mechanical strength of the composite board is significantly reduced. This may be because the multi-dimensional synergy of bisphenol A phenolic resin (mechanical support), epoxy-modified acrylic resin (enhanced interfacial adhesion), and polysilazane resin (high-temperature flame retardant) achieves a balance between mechanical, fireproof, and acoustic properties.

[0107] Combining the data from Example 1 and Comparative Example 4, it can be seen that even without silanization, the mechanical properties of the composite panel are reduced. This is likely because the silanized aerogel particles contain amino functional groups, which can react with epoxy groups to form chemical bonds, enhancing the interfacial bonding between the aerogel particles and the composite resin, thereby improving the compatibility of the aerogel and the composite resin. When the aerogel and composite resin are well compatible, the aerogel particles can be more evenly dispersed in the composite resin matrix, avoiding interfacial defects, thereby effectively improving the mechanical strength, sound insulation, and thermal insulation of the aluminum composite panel.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-strength fireproof aluminum composite panel, characterized in that: The composite plate is provided with an aluminum alloy panel, a first adhesive layer, a functional core layer, a second adhesive layer and an aluminum alloy substrate in order from top to bottom; wherein the functional core layer includes an aluminum honeycomb core panel and a filler provided in the cavity structure of the aluminum honeycomb core panel, the filler is formed by solidifying a slurry, and the slurry includes the following raw materials in weight percentage: 10-20% expandable graphite, 10-20% modified aerogel particles, 10-20% composite resin, 2-5% curing agent, and the balance is solvent, and the composite resin is bisphenol A bisphenol A phenolic resin, an epoxy-modified acrylic resin, and a polysilazane resin; the mass ratio of the bisphenol A phenolic resin, the epoxy-modified acrylic resin, and the polysilazane resin is 1:(1.5-3):(0.5-1); the curing agent is triethylenetetramine, hexamethylenetetramine, and 1,3-propylene glycol bis(4-aminobenzoate) in a mass ratio of 1:(0.5-2):(0.5-2); and the solvent is dichloromethane, ethanol, and tetrahydrofuran in a mass ratio of 1:(1-2):(1-2); The preparation method of the modified aerogel particles comprises the following steps: soaking the aerogel particles in a solution containing a silane modifier, taking out the aerogel particles, and drying the aerogel particles to obtain the modified aerogel particles.

2. The high-strength fireproof aluminum composite panel according to claim 1, characterized in that: In the preparation method of the modified aerogel particles, the aerogel particles are immersed in a solution containing a silane modifier with a mass of 3-4 times the mass of the aerogel particles, the solvent of the solution containing the silane modifier is n-hexane, the volume concentration of the solution containing the silane modifier is 60-70%, and the immersion time is 12-24 hours.

3. The high-strength fireproof aluminum composite panel according to claim 1, characterized in that: The aerogel particles are silica aerogel particles, and the silane modifier is at least one of KH550, KH560 and KH570.

4. The high-strength fireproof aluminum composite panel according to claim 1, characterized in that: The aluminum honeycomb core panel is made of an aluminum alloy material with a cross-section of regular hexagonal channels connected around the periphery. The side length of the regular hexagonal channels is 6-8 mm, the wall thickness is 0.15-0.3 mm, and the thickness of the aluminum honeycomb core panel is 15-30 mm. After the slurry is injected into the cavity structure of the aluminum honeycomb core panel and baked and solidified to form the filler, the aluminum honeycomb core panel gains weight by 16±1%.

5. The method for preparing the high-strength fireproof aluminum composite panel according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Cutting the aluminum alloy panel and the aluminum alloy substrate into predetermined sizes, cleaning them, and obtaining pre-treated aluminum alloy panels and aluminum alloy substrates; (2) spraying an adhesive on the upper surface of the pretreated aluminum alloy substrate and curing the adhesive to form a second adhesive layer; (3) The modified aerogel particles, expandable graphite, composite resin, curing agent and solvent are stirred and mixed to form a slurry, the slurry is injected into the cavity structure of the aluminum honeycomb core panel, and the slurry is baked and cured. After the filler is formed in the cavity structure of the aluminum honeycomb core panel, the functional core layer is obtained, and the lower surface of the functional core layer is bonded to the second adhesive layer and pressurized and cured; (4) Coating an adhesive on the lower surface of the aluminum alloy panel to form a first adhesive layer, which is then combined with the upper surface of the functional core layer and cured to obtain the high-strength fireproof aluminum composite panel.

6. The method for preparing the high-strength fireproof aluminum composite panel according to claim 5, wherein: In the steps (2) and (4), the curing temperature is 80-90°C and the curing time is 20-40 min; in the step (3), the pressure of the pressurized curing is 25-35 MPa, the temperature is 100-150°C, and the time is 10-20 min.

7. The method for preparing a high-strength fireproof aluminum composite panel according to claim 6, wherein: The adhesive is a hot-melt epoxy resin adhesive.

8. Use of the high-strength fireproof aluminum composite panel according to any one of claims 1 to 4 in the preparation of building panels.

Images