Intelligent temperature-adjusting aluminum honeycomb composite board based on phase change material and manufacturing process thereof

Abstract

The application discloses intelligent temperature-regulating aluminum honeycomb composite board based on phase change material and a manufacturing process thereof, and relates to the field of building energy saving.The phase change material provided by the application is prepared from graphene composite cellulose and hydroxyethyl methacrylate as raw materials, and is formed through freezing forming, freeze drying and heat crosslinking treatment to form composite cellulose aerogel, and then vacuum impregnation of polyethylene glycol is carried out; the graphene composite cellulose is prepared by reaction of amino cellulose, epoxy functionalized graphene and epoxidized polymer, so that the heat conduction path of graphene and the rigidity and heat-resistant structure of polymer are synchronously introduced; the phase change material is filled in the aluminum honeycomb board, and then compression is carried out to obtain the intelligent temperature-regulating composite board.The phase change material prepared by the application has low leakage rate, high thermal conductivity and excellent mechanical properties, and is suitable for the field of building energy saving.

Description

Technical Field

[0001] This invention relates to the field of building energy conservation technology, specifically to an intelligent temperature-regulating aluminum honeycomb composite panel based on phase change materials and its manufacturing process. Background Technology

[0002] In various fields such as building energy conservation, transportation, electronic equipment heat dissipation, and cold chain logistics, dynamic temperature control and performance matching of structural materials have become core demands for industry development. With the deepening of energy conservation and environmental protection concepts and the promotion of intelligent technologies, traditional single-function materials can no longer meet the comprehensive needs of the market.

[0003] Aluminum honeycomb composite panels are widely used in building exteriors, vehicle interiors, and equipment housings due to their outstanding advantages such as lightweight, high strength, sound insulation, noise reduction, and good mechanical stability. However, traditional aluminum honeycomb composite panels only have basic structural functions and lack active temperature regulation capabilities.

[0004] Phase change materials (PCMs), as functional materials that can absorb or release a large amount of latent heat through a phase change process within a specific temperature range, provide an effective path to solve temperature control problems. Polyethylene glycol (PEG) is a commonly used core component of PCMs due to its large latent heat of phase change, strong adaptability to phase change temperature ranges, and good chemical stability. However, when PCMs are combined with aluminum honeycomb panels, existing technologies still face several insurmountable bottlenecks: 1. PCMs are prone to leakage: PCMs such as PEG change from a solid to a liquid state during the phase change process. Liquid PCMs are prone to leakage from the pores of the aluminum honeycomb core or the composite interface, causing the temperature control performance to rapidly decline with increasing usage, severely affecting product lifespan; 2. PCMs themselves have low thermal conductivity, and simply adding them results in slow heat transfer, leading to a delayed temperature control response in the composite panel, unable to cope with rapid fluctuations in ambient temperature. Blindly adding thermally conductive fillers can easily damage the phase change characteristics of the PCMs and the mechanical properties of the composite panel.

[0005] Therefore, in order to solve the above problems, this invention proposes an intelligent temperature-regulating aluminum honeycomb composite panel based on phase change materials and its manufacturing process. Summary of the Invention

[0006] The purpose of this invention is to provide a smart temperature-regulating aluminum honeycomb composite panel based on phase change materials and its manufacturing process, so as to solve the problems raised in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A smart temperature-regulating aluminum honeycomb composite panel based on phase change material, comprising an aluminum honeycomb panel and a phase change material.

[0008] Furthermore, the aluminum honeycomb panel includes a base plate, an aluminum honeycomb core, and a top plate; The phase change material is located inside the aluminum honeycomb core; The base plate and top plate are made of aluminum sheet.

[0009] Furthermore, phase change materials are prepared using the following processes: (1) Add graphene composite cellulose to deionized water to obtain graphene composite cellulose dispersion; (2) Add hydroxyethyl methacrylate, crosslinking agent and initiator to graphene composite cellulose dispersion, react at 70-80℃ for 2-4h to obtain composite hydrogel precursor solution; inject it into mold, heat to 80-90℃, react for 1-2h to obtain composite hydrogel block; (3) The composite hydrogel block was freeze-molded, freeze-dried and thermally cross-linked to obtain composite cellulose aerogel; (4) Impregnate the composite cellulose aerogel with molten polyethylene glycol in a vacuum environment to obtain a phase change material.

[0010] Furthermore, in step (1), the graphene composite cellulose is prepared by the following process: Amino cellulose was added to an epoxy-functionalized graphene dispersion and stirred at 70-80℃ for 4-5 hours. Then, an epoxidized polymer dispersion was added and reacted at 70-80℃ for 8-12 hours. After precipitation, washing, and drying, a graphene composite cellulose containing amino groups, graphene, imide, and bicyclic compounds was obtained.

[0011] Furthermore, the aminocellulose is diethylaminoethyl cellulose.

[0012] Furthermore, the mass ratio of aminocellulose, epoxy-functionalized graphene, and epoxidized polymer is 1:(0.1-0.3):(0.3-0.5).

[0013] Furthermore, the epoxy-functionalized graphene dispersion is prepared by the following process: adding epoxy-functionalized graphene to deionized water and dispersing it for 2-4 hours under an ultrasonic power of 300-500W to obtain the epoxy-functionalized graphene dispersion.

[0014] Furthermore, the ratio of epoxy-functionalized graphene to deionized water is 1 g / (200-300) mL.

[0015] Furthermore, the epoxidized polymer dispersion is prepared by the following process: S1: Dissolve 5-norbornene-2,3-dicarboxylic anhydride in N,N-dimethylformamide, add triethylamine and mix well, then add aniline and react at 70-90℃ for 8-10 h. After filtration, washing and drying, obtain norbornene imide monomer. S2: Dissolve the norbornene imide monomer in N,N-dimethylformamide, add a catalyst, react at 30-50℃ for 8-10 hours, add a quencher, and after soaking, washing, filtering and drying, obtain the norbornene imide polymer; S3: Dissolve the norbornene imide polymer in toluene, add m-chloroperoxybenzoic acid, and react for 3-5 hours to obtain epoxidized poly(norbornene-imide). S4: Dissolve epoxidized poly(norbornene-imide) in dimethyl sulfoxide to obtain a polymer mother liquor; add the polymer mother liquor dropwise to an aqueous surfactant solution at a stirring speed of 800-1000 rpm to obtain an epoxidized polymer dispersion.

[0016] Furthermore, in step S1, the mass ratio of 5-norbornene-2,3-dicarboxylic anhydride, triethylamine, and aniline is 1:(1-1.2):(1-1.2); The ratio of 5-norbornene-2,3-dicarboxylic anhydride to N,N-dimethylformamide is 1 g / (10-12) mL.

[0017] Furthermore, in step S2, the mass ratio of norbornene imide monomer, catalyst, and quencher is 100:(0.5-1):(3-5); The ratio of norbornene imide monomer to N,N-dimethylformamide is 1 g / (15-20) mL; The catalyst is a Grubbs II catalyst; The quenching agent is vinyl ethyl ether.

[0018] Furthermore, in step S3, the mass ratio of norbornene imide polymer to m-chloroperoxybenzoic acid is 1:(1-1.2); The ratio of norborneol imide polymer to toluene is 1 g / (20-25) mL.

[0019] Furthermore, in step S4, the mass concentration of the polymer mother liquor is 3-5%; The surfactant aqueous solution is a sodium dodecyl sulfate aqueous solution with a mass concentration of 0.8-1%; The volume ratio of polymer mother liquor to surfactant aqueous solution is 1:(5-10).

[0020] Furthermore, in step (2), the mass ratio of hydroxyethyl methacrylate, crosslinking agent and initiator is 1:(0.01-0.015):(0.01-0.015); the ratio of hydroxyethyl methacrylate and graphene composite cellulose dispersion is 1g / (5-10)mL; The crosslinking agent is N,N-methylenebisacrylamide; The initiator is ammonium persulfate; The mold is the same shape and size as the aluminum honeycomb core.

[0021] Furthermore, in step (3), the process conditions for freeze molding, freeze drying, and thermal crosslinking are as follows: freeze molding at -60℃ to -50℃ for 10-12h; freeze drying at a vacuum of 5-10Pa and a temperature of -80℃ to -60℃ for 36-48h; and thermal crosslinking at a temperature of 80-90℃ for 20-24h.

[0022] Furthermore, in step (4), the polyethylene glycol is one or a mixture of polyethylene glycol 1000, polyethylene glycol 1500, and polyethylene glycol 2000; The melting temperature of polyethylene glycol is 40-55℃; The impregnation process conditions are as follows: impregnation for 10-12 hours at a vacuum of -0.095 MPa to -0.090 MPa and a temperature of 50-70℃.

[0023] A manufacturing process for a smart temperature-regulating aluminum honeycomb composite panel based on phase change material includes the following steps: placing an aluminum honeycomb core on a base plate, filling the aluminum honeycomb core with phase change material, covering it with a top plate, and pressing it under a pressure of -0.07MPa to -0.06MPa to obtain the composite panel.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention describes an intelligent temperature-regulating aluminum honeycomb composite panel based on phase change materials and its manufacturing process. This invention uses graphene composite cellulose and hydroxyethyl methacrylate as raw materials to construct a rigid composite cellulose aerogel skeleton with high crosslinking density and nano / micron multi-level pores. Then, molten polyethylene glycol is impregnated into the pores of the aerogel skeleton under vacuum. The molten polyethylene glycol is constrained inside the pores of the aerogel skeleton, and its flow is constrained by steric hindrance and capillary force, thereby enabling the phase change material to maintain excellent shape stability and low leakage characteristics during long-term and multiple phase change cycles.

[0025] 2. The present invention describes an intelligent temperature-regulating aluminum honeycomb composite panel based on phase change materials and its manufacturing process. In the preparation of graphene composite cellulose, the amino groups of aminocellulose react with the epoxy groups of epoxy-functionalized graphene to form a strong covalent bond, thereby introducing epoxy-functionalized graphene and avoiding its agglomeration, so that it is uniformly dispersed and anchored on the cellulose skeleton; and a continuous thermally conductive path with low interfacial thermal resistance connected by chemical bonds is established inside the cellulose skeleton, which improves the overall thermal conductivity of the material and improves the temperature regulation response speed.

[0026] 3. The present invention describes a smart temperature-regulating aluminum honeycomb composite panel based on phase change materials and its manufacturing process. In the preparation of graphene composite cellulose, the amino groups of aminocellulose react with the epoxy groups of the epoxidized polymer, introducing a rigid bicyclic structure and a highly thermally stable imide ring into the graphene composite cellulose. This significantly improves the glass transition temperature and thermal decomposition temperature of the entire aerogel skeleton. This allows the aerogel skeleton to maintain rigidity and non-deformation within the working temperature range of polyethylene glycol, providing reliable structural support for long-term cyclic use.

[0027] 4. The present invention describes a smart temperature-regulating aluminum honeycomb composite panel based on phase change materials and its manufacturing process. In the preparation of the epoxidized polymer dispersion of the present invention, firstly, a monomer with both rigid norbornene bicyclic rings and highly thermally stable imide rings is synthesized through an imidization reaction; then, a polymer is obtained through ring-opening metathesis polymerization; subsequently, an active epoxy group is introduced into the side chain through an epoxidation reaction, enabling it to covalently bond with the cellulose backbone; finally, an aqueous dispersion is prepared to ensure its uniform dispersion in the cellulose system; when this dispersion participates in the preparation of graphene composite cellulose, its epoxy groups can react with the amino groups of graphene composite cellulose, introducing the rigid structure and imide rings into the graphene composite cellulose through covalent bonds. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0029] In the following specific implementation: Polyethylene glycol 1000 has a melting point of 37℃ and a purity of 99%; polyethylene glycol 1500 has a melting point of 45℃ and a purity of 99%; polyethylene glycol 2000 has a melting point of 51℃ and a purity of 99%; hydroxyethyl methacrylate has a CAS number of 868-77-9 and a purity of 97%; N,N-methylenebisacrylamide has a CAS number of 110-26-9 and a purity of 99%; ammonium persulfate has a CAS number of 7727-54-0 and a purity of 98.5%; diethylaminoethyl cellulose has a C... AS number 9013-34-7, particle size 40μm; graphene oxide sheet diameter 10μm, purity 98%; 5-norbornene-2,3-dicarboxylic anhydride CAS number 2746-19-2, purity 99%; N,N-dimethylformamide CAS number 68-12-2, purity 99%; triethylamine CAS number 121-44-8, purity 99.5%; aniline CAS number 62-53-3, purity 99%; Grubbs The CAS number for catalyst II is 246047-72-3, with a purity of 98%; the CAS number for vinyl ethyl ether is 109-92-2, with a purity of 99%; the CAS number for m-chloroperoxybenzoic acid is 937-14-4, with a purity of 85%; the CAS number for toluene is 108-88-3, with a purity of 99%; the CAS number for dimethyl sulfoxide is 67-68-5, with a purity of 99%; the mass concentration of sodium dodecyl sulfate aqueous solution is 1%; the thickness of the aluminum plate is 2mm, and the material is 3003 aluminum alloy; the aluminum honeycomb core is a regular hexagonal aluminum honeycomb core with a side length of 6mm, and the material is 3003 aluminum alloy; the CAS number for silane coupling agent KH560 is 2530-83-8, with a purity of 99%; the CAS number for anhydrous ethanol is 64-17-5, with a purity of 99.99%. The epoxy-functionalized graphene dispersion was prepared by the following process: epoxy-functionalized graphene was added to deionized water and dispersed for 3 hours under ultrasonic power of 400W to obtain the epoxy-functionalized graphene dispersion; the ratio of epoxy-functionalized graphene to deionized water was 1g / 250mL. Epoxy-functionalized graphene was prepared by the following process: graphene oxide and silane coupling agent KH560 were dissolved in anhydrous ethanol at a mass ratio of 0.1:2, and the mixture was ultrasonically reacted for 35 min, reacted at 70℃ for 4 h, and then filtered, washed and dried to obtain epoxy-functionalized graphene; the ratio of graphene oxide to anhydrous ethanol was 1 g / 500 mL. The epoxidized polymer dispersion was prepared by the following process: S1: 5-norbornene-2,3-dicarboxylic anhydride was dissolved in N,N-dimethylformamide, triethylamine was added and mixed evenly, then aniline was added, and the mixture was reacted at 80℃ for 9 h. After filtration, washing and drying, norbornene imide monomer was obtained; the mass ratio of 5-norbornene-2,3-dicarboxylic anhydride, triethylamine and aniline was 1:1.1:1.1; the ratio of 5-norbornene-2,3-dicarboxylic anhydride and N,N-dimethylformamide was 1 g / 11 mL; S2: The norbornene imide monomer was dissolved in N,N-dimethylformamide, and Grubbs II catalyst was added. After reacting at 45°C for 9 hours, vinyl ether was added. After soaking, washing, filtering and drying, the norbornene imide polymer was obtained. The mass ratio of norbornene imide monomer, Grubbs II catalyst and vinyl ether was 100:0.8:4. The ratio of norbornene imide monomer to N,N-dimethylformamide was 1 g / 18 mL. S3: Dissolve the norbornene imide polymer in toluene, add m-chloroperoxybenzoic acid, and react for 3-5 hours to obtain epoxidized poly(norbornene-imide); the mass ratio of norbornene imide polymer to m-chloroperoxybenzoic acid is 1:1.1; the ratio of norbornene imide polymer to toluene is 1 g / 22 mL; S4: Dissolve the epoxidized poly(norbornene-imide) in dimethyl sulfoxide to obtain a polymer mother liquor with a mass concentration of 4%; add the polymer mother liquor dropwise to a sodium dodecyl sulfate aqueous solution with a mass concentration of 1% under stirring speed of 900 rpm to obtain an epoxidized polymer dispersion; the volume ratio of the polymer mother liquor to the sodium dodecyl sulfate aqueous solution is 1:8.

[0030] Example 1: A smart temperature-regulating aluminum honeycomb composite panel based on phase change material, comprising an aluminum honeycomb panel and a phase change material; Aluminum honeycomb panels consist of a base plate, an aluminum honeycomb core, and a top plate. The phase change material is located inside the aluminum honeycomb core; The base plate and top plate are made of aluminum sheet; Phase change materials are prepared by the following processes: (1) Add graphene composite cellulose to deionized water to obtain graphene composite cellulose dispersion; (2) Hydroxyethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate were added to the graphene composite cellulose dispersion in a mass ratio of 1:0.012:0.012. The mixture was reacted at 75°C for 3 hours to obtain a composite hydrogel precursor solution. The solution was then injected into a mold, heated to 85°C, and reacted for 1.5 hours to obtain a composite hydrogel block. The ratio of hydroxyethyl methacrylate to the graphene composite cellulose dispersion was 1 g / 8 mL. (3) The composite hydrogel block was frozen at -55℃ for 11h, then freeze-dried at a vacuum of 8Pa and a temperature of -70℃ for 40h, and finally thermally crosslinked at 85℃ for 22h to obtain the composite cellulose aerogel. (4) The composite cellulose aerogel was impregnated with polyethylene glycol molten at 40°C for 11 h under a vacuum of -0.095 MPa and a temperature of 60°C to obtain a phase change material; the polyethylene glycol was polyethylene glycol 1000. In step (1), the graphene composite cellulose is prepared by the following process: diethylaminoethyl cellulose is added to an epoxy-functionalized graphene dispersion, and the mixture is stirred and reacted at 75°C for 4.5 h. Then, an epoxidized polymer dispersion is added, and the mixture is reacted at 75°C for 10 h. After precipitation, washing, and drying, a graphene composite cellulose containing amino groups, graphene, imide, and bicyclic compounds is obtained. The mass ratio of diethylaminoethyl cellulose, epoxy-functionalized graphene, and epoxidized polymer is 1:0.2:0.4. A manufacturing process for a smart temperature-regulating aluminum honeycomb composite panel based on phase change material includes the following steps: placing an aluminum honeycomb core on a base plate, filling the aluminum honeycomb core with phase change material, covering it with a top plate, and pressing it under a pressure of -0.07MPa to obtain the composite panel.

[0031] Example 2: A smart temperature-regulating aluminum honeycomb composite panel based on phase change material, comprising an aluminum honeycomb panel and a phase change material; Aluminum honeycomb panels consist of a base plate, an aluminum honeycomb core, and a top plate. The phase change material is located inside the aluminum honeycomb core; The base plate and top plate are made of aluminum sheet; Phase change materials are prepared by the following processes: (1) Add graphene composite cellulose to deionized water to obtain graphene composite cellulose dispersion; (2) Hydroxyethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate were added to the graphene composite cellulose dispersion and reacted at 70°C for 4 h to obtain a composite hydrogel precursor solution; the precursor solution was injected into a mold, heated to 80°C and reacted for 2 h to obtain a composite hydrogel block; the mass ratio of hydroxyethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate was 1:0.01:0.01; the ratio of hydroxyethyl methacrylate to graphene composite cellulose dispersion was 1 g / 5 mL; (3) The composite hydrogel block was frozen at -60℃ for 10h, then freeze-dried at 5Pa vacuum and -80℃ for 36h, and finally thermally crosslinked at 80℃ for 24h to obtain the composite cellulose aerogel. (4) The composite cellulose aerogel was impregnated with molten polyethylene glycol at 50°C for 12 hours under a vacuum of -0.090 MPa and a temperature of 50°C to obtain a phase change material; the polyethylene glycol was polyethylene glycol 1500. In step (1), the graphene composite cellulose is prepared by the following process: diethylaminoethyl cellulose is added to an epoxy-functionalized graphene dispersion, and after stirring and reacting at 70°C for 5 hours, an epoxidized polymer dispersion is added, and after reacting at 70°C for 12 hours, after precipitation, washing, and drying, a graphene composite cellulose containing amino groups, graphene, imide, and bicyclic compounds is obtained; the mass ratio of diethylaminoethyl cellulose, epoxy-functionalized graphene, and epoxidized polymer is 1:0.1:0.3. A manufacturing process for a smart temperature-regulating aluminum honeycomb composite panel based on phase change material includes the following steps: placing an aluminum honeycomb core on a base plate, filling the aluminum honeycomb core with phase change material, covering it with a top plate, and pressing it under a pressure of -0.07MPa to obtain the composite panel.

[0032] Example 3: A smart temperature-regulating aluminum honeycomb composite panel based on phase change material, comprising an aluminum honeycomb panel and a phase change material; Aluminum honeycomb panels consist of a base plate, an aluminum honeycomb core, and a top plate. The phase change material is located inside the aluminum honeycomb core; The base plate and top plate are made of aluminum sheet; Phase change materials are prepared by the following processes: (1) Add graphene composite cellulose to deionized water to obtain graphene composite cellulose dispersion; (2) Hydroxyethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate were added to the graphene composite cellulose dispersion and reacted at 80°C for 2 h to obtain a composite hydrogel precursor solution; the precursor solution was injected into a mold, heated to 90°C and reacted for 1 h to obtain a composite hydrogel block; the mass ratio of hydroxyethyl methacrylate, N,N-methylenebisacrylamide and ammonium persulfate was 1:0.015:0.015; the ratio of hydroxyethyl methacrylate to graphene composite cellulose dispersion was 1 g / 10 mL; (3) The composite hydrogel block was frozen at -50℃ for 12h, then freeze-dried at 10Pa vacuum and -60℃ for 48h, and finally thermally crosslinked at 90℃ for 20h to obtain the composite cellulose aerogel. (4) The composite cellulose aerogel was impregnated with polyethylene glycol molten at 55°C for 10 h under a vacuum of -0.090 MPa and a temperature of 70°C to obtain a phase change material; the polyethylene glycol was polyethylene glycol 2000. In step (1), the graphene composite cellulose is prepared by the following process: diethylaminoethyl cellulose is added to an epoxy-functionalized graphene dispersion, and the mixture is stirred and reacted at 80°C for 4 hours. Then, an epoxidized polymer dispersion is added, and the mixture is reacted at 80°C for 8 hours. After precipitation, washing, and drying, a graphene composite cellulose containing amino groups, graphene, imide, and bicyclic compounds is obtained. The mass ratio of diethylaminoethyl cellulose, epoxy-functionalized graphene, and epoxidized polymer is 1:0.3:0.5. A manufacturing process for a smart temperature-regulating aluminum honeycomb composite panel based on phase change material includes the following steps: placing an aluminum honeycomb core on a base plate, filling the aluminum honeycomb core with phase change material, covering it with a top plate, and pressing it under a pressure of -0.06MPa to obtain the composite panel.

[0033] Comparative Example 1: Based on Example 1, when preparing phase change materials, the graphene composite cellulose was replaced with the same mass of cellulose.

[0034] Comparative Example 2: Based on Example 1, no epoxidized polymer dispersion was added when preparing graphene composite cellulose.

[0035] Comparative Example 3: Based on Example 1, when preparing graphene composite cellulose, the epoxy functionalized graphene was replaced with the same mass of graphene oxide.

[0036] Experiment: Samples were prepared from the composite cellulose aerogels, phase change materials, and composite plates obtained in Examples 1-3 and Comparative Examples 1-3. Their properties were tested and the results were recorded. Melting point and phase change enthalpy test: Differential scanning calorimetry was used to test the melting point and phase change enthalpy of the phase change material at a rate of 10℃ / min under a nitrogen atmosphere. Leakage rate test: After placing the phase change material in an 80℃ oven for 2 hours, the phase change material is weighed and the leakage rate is calculated; Compression strength test: A 20 mm thick sample of composite cellulose aerogel was prepared. A CMT6104 microcomputer-controlled universal testing machine was used to test the compressive strength of the sample when the compression rate was 50% at a compression speed of 2 mm / min. Thermal conductivity test: The composite board was made into a 100mm×100mm sample and tested at 25℃ using a transient planar heat source thermal conductivity tester (Hot Disk TPS 2500S).

[0037]

[0038] Conclusion: Compared with the composite cellulose aerogel, phase change material and composite plate prepared in Examples 1-3, the performance of the composite cellulose aerogel, phase change material and composite plate prepared in Examples 1-3 is significantly reduced, which fully demonstrates the necessity and synergy of each component and step in the technical solution of the present invention.

[0039] Comparative Example 1 is based on Example 1, but replaces graphene composite cellulose with ordinary cellulose: Ordinary cellulose relies on the physical adsorption of hydroxyl groups with polyethylene glycol, which has limited encapsulation capacity for polyethylene glycol and significantly increases the leakage rate; at the same time, due to the lack of epoxy-functionalized graphene and the imide ring and bicyclic structure introduced by the epoxidized polymer, its compressive strength and thermal conductivity are significantly reduced.

[0040] Comparative Example 2, based on Example 1, did not add epoxidized polymer dispersion when preparing graphene composite cellulose: because the imide ring and bicyclic structure introduced by epoxidized polymer are missing in the composite cellulose aerogel, its mechanical support (compressive strength) is significantly reduced, making it difficult to maintain structural integrity during long-term cycling.

[0041] Comparative Example 3 is based on Example 1, but replaces the epoxy-functionalized graphene with ordinary graphene: Ordinary graphene lacks epoxy groups and cannot be anchored to cellulose through chemical bonds, making it prone to agglomeration. This results in a discontinuous thermally conductive network and high interfacial thermal resistance, thus its thermal conductivity improvement effect is limited and far lower than that of Example 1.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A smart temperature-regulating aluminum honeycomb composite panel based on phase change materials, characterized in that: Including aluminum honeycomb panels and phase change materials; The aluminum honeycomb panel includes a base plate, an aluminum honeycomb core, and a top plate; The phase change material is located inside the aluminum honeycomb core; The phase change material is prepared by the following process: (1) Add graphene composite cellulose to deionized water to obtain graphene composite cellulose dispersion; (2) Add hydroxyethyl methacrylate, crosslinking agent and initiator to graphene composite cellulose dispersion, react at 70-80℃ for 2-4h to obtain composite hydrogel precursor solution; inject it into mold, heat to 80-90℃, react for 1-2h to obtain composite hydrogel block; (3) The composite hydrogel block was freeze-molded, freeze-dried and thermally cross-linked to obtain composite cellulose aerogel; (4) Impregnate the composite cellulose aerogel with molten polyethylene glycol under vacuum to obtain a phase change material; In step (1), the graphene composite cellulose is prepared by the following process: amino cellulose is added to an epoxy functionalized graphene dispersion, and the mixture is stirred and reacted at 70-80℃ for 4-5 hours. Then, an epoxy polymer dispersion is added, and the mixture is reacted at 70-80℃ for 8-12 hours. After precipitation, washing, and drying, a graphene composite cellulose containing amino groups, graphene, imide, and bicyclic compounds is obtained. The epoxidized polymer dispersion is prepared by the following process: epoxidized poly(norbornene-imide) is dissolved in dimethyl sulfoxide to obtain a polymer mother liquor; the polymer mother liquor is added dropwise to an aqueous surfactant solution at a stirring speed of 800-1000 rpm to obtain the epoxidized polymer dispersion.

2. The intelligent temperature-regulating aluminum honeycomb composite panel based on phase change material according to claim 1, characterized in that: In step (2), the mass ratio of hydroxyethyl methacrylate, crosslinking agent and initiator is 1:(0.01-0.015):(0.01-0.015).

3. The intelligent temperature-regulating aluminum honeycomb composite panel based on phase change material according to claim 1, characterized in that: In step (3), the process conditions for freeze molding, freeze drying, and thermal crosslinking are as follows: freeze molding at -60℃ to -50℃ for 10-12h; freeze drying at a vacuum of 5-10Pa and a temperature of -80℃ to -60℃ for 36-48h; and thermal crosslinking at a temperature of 80-90℃ for 20-24h.

4. The intelligent temperature-regulating aluminum honeycomb composite panel based on phase change material according to claim 1, characterized in that: In step (4), the polyethylene glycol is one or more of polyethylene glycol 1000, polyethylene glycol 1500, and polyethylene glycol 2000.

5. The intelligent temperature-regulating aluminum honeycomb composite panel based on phase change material according to claim 1, characterized in that: In step (4), the impregnation process conditions are: impregnation for 10-12 hours at a vacuum of -0.095 MPa to -0.090 MPa and a temperature of 50-70°C.

6. The intelligent temperature-regulating aluminum honeycomb composite panel based on phase change material according to claim 2, characterized in that: The mass ratio of aminocellulose, epoxy-functionalized graphene, and epoxidized polymer is 1:(0.1-0.3):(0.3-0.5).

7. The intelligent temperature-regulating aluminum honeycomb composite panel based on phase change material according to claim 1, characterized in that: The epoxy-functionalized graphene dispersion is prepared by the following process: adding epoxy-functionalized graphene to deionized water and dispersing it for 2-4 hours under ultrasonic power of 300-500W to obtain the epoxy-functionalized graphene dispersion.

8. The intelligent temperature-regulating aluminum honeycomb composite panel based on phase change material according to claim 1, characterized in that: The epoxidized poly(norbornene-imide) is prepared by the following process: S1: Dissolve 5-norbornene-2,3-dicarboxylic anhydride in N,N-dimethylformamide, add triethylamine and mix well, then add aniline and react at 70-90℃ for 8-10 h. After filtration, washing and drying, obtain norbornene imide monomer. S2: Dissolve the norbornene imide monomer in N,N-dimethylformamide, add a catalyst, react at 30-50℃ for 8-10 hours, add a quencher, and after soaking, washing, filtering and drying, obtain the norbornene imide polymer; S3: Dissolve the norbornene imide polymer in toluene, add m-chloroperoxybenzoic acid, and react for 3-5 hours to obtain epoxidized poly(norbornene-imide).

9. The manufacturing process of a smart temperature-regulating aluminum honeycomb composite panel based on phase change materials according to any one of claims 1-8, characterized in that: Includes the following steps: An aluminum honeycomb core is placed on a base plate, then phase change material is filled into the aluminum honeycomb core, and a top plate is placed on top. The composite board is then pressed together under a pressure of -0.07 MPa to -0.06 MPa.

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