Phase change material for building as well as preparation method and application of phase change material

Abstract

The invention relates to a phase-change material for a building as well as a preparation method and application of the phase-change material. The phase-change material for the building comprises the following components in parts by weight: 600-800 parts of a cooked phase-change material, 20-30 parts of a nucleating agent and 1-5 parts of a temperature regulator, wherein the cooked phase change material is a mixture of anhydrous calcium chloride, sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate; the nucleating agent is a mixture of strontium chloride hexahydrate, polyethylene glycol and carboxymethyl cellulose, and the temperature regulator is urea. According to the application, the phase-change material for the building is used for preparing a phase-change composite vacuum insulation panel, the material is large in phase-change latent heat and high in cycling stability, the phase-change material serves as the hydrated salt phase-change material for the building, the problem that the unit volume / mass enthalpy value of phase-change microcapsules used for traditional buildings is low is solved, and the phase-change material has the advantages of being appropriate in phase-change temperature, high in cycling stability and the like. The material is used for preparing the vacuum insulated panel, and the heat insulation effect is good.

Description

Technical Field

[0001] The invention relates to a phase change material for construction, a preparation method and application thereof, and belongs to the technical field of materials. Background Art

[0002] Building energy consumption accounts for more than 30% of the total national energy consumption, and it is showing a growing trend. Accelerating the promotion of building energy conservation is of great significance to the realization of green and low-carbon development goals. Therefore, improving the thermal performance of building envelopes can improve the thermal environment of buildings, thereby reducing people's dependence on heating, air conditioning and other equipment. By integrating phase change materials into building envelopes, their latent heat can be used to store and release thermal energy, which can make up for the shortcomings of current building thermal insulation materials that are prone to large indoor and outdoor temperature fluctuations due to low heat capacity, and ultimately achieve the effect of reducing building energy consumption. Compared with high-priced and flammable organic phase change materials, inorganic phase change materials have the advantages of low cost, wide sources and non-flammable. However, due to the problems of excessive supercooling, poor cycle stability and easy leakage of inorganic hydrated salt phase change materials for construction, their application is greatly limited.

[0003] In order to overcome the above shortcomings, the latest technical direction is to use porous materials to adsorb phase change materials, such as using porous materials such as expanded perlite and diatomaceous earth to adsorb phase change materials. However, in order to prevent leakage of phase change materials during the phase change process, the amount of adsorption of phase change materials is small, resulting in low latent heat; or encapsulation in the form of microcapsules, which is to encapsulate phase change materials with micro-nano-sized shells, but its encapsulation technology is complex and costly, and the external encapsulation material is not functional, and its phase change latent heat per unit volume is lower than that of hydrated salt phase change materials. Therefore, the packaging method, low latent heat and poor cycle stability of hydrated salt phase change materials in construction applications remain to be solved. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the present invention provides a phase change material for construction, a preparation method and application thereof.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] A phase change material for construction, comprising 600-800 parts by weight of a phase change material, 20-30 parts by weight of a nucleating agent and 1-5 parts by weight of a temperature regulator; wherein the phase change material is a mixture of anhydrous calcium chloride, sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate; the nucleating agent is a mixture of strontium chloride hexahydrate, polyethylene glycol and carboxymethyl cellulose; and the temperature regulator is urea.

[0009] The phase change material for construction as described above is a mixture of 600-650 parts of anhydrous calcium chloride, 80-100 parts of sodium carbonate decahydrate and 50-80 parts of disodium hydrogen phosphate dodecahydrate.

[0010] In the phase change material for construction as described above, the nucleating agent is 20-23 parts of strontium chloride hexahydrate, 1-3 parts of polyethylene glycol and 1-3 parts of carboxymethyl cellulose, and the molecular weight of the polyethylene glycol is 600-800.

[0011] A phase-change composite vacuum insulation panel comprises an insulation layer and a phase-change layer, wherein the insulation layer is one of an aerogel ceramic fiberboard, an aerogel glass fiberboard, a fumed silica composite inorganic fiberboard, a ceramic fiber felt board or a glass fiber felt board, and the phase-change layer comprises a substrate, a phase-change material and a packaging material, wherein the phase-change material is covered in the substrate, and the packaging material is covered on the phase-change material to form a phase-change layer; wherein the substrate is an aerogel ceramic fiberboard or an aerogel glass fiberboard with five hydrophobic outer surfaces and one hydrophilic inner surface; the phase-change material is one of a hydrated salt phase-change material, a composite hydrated salt phase-change material, etc.; the packaging material is a hydrophobic aerogel ceramic fiber felt or a hydrophobic aerogel glass fiber felt; the phase-change layer is placed on the insulation layer and packaged together in a vacuum barrier film to form a phase-change composite vacuum insulation panel.

[0012] Furthermore, the composite hydrated salt phase change material is the building phase change material as described above.

[0013] A method for preparing a phase-change composite vacuum insulation panel comprises the following steps:

[0014] S1. Stir and mix the above-mentioned phase change material for construction with water; then add a nucleating agent and stir and mix; finally add a temperature regulator and stir to obtain a phase change material, which is placed in an environment of 50 to 60° C. to keep in a liquid state for standby use;

[0015] S2, pouring the liquid phase change material onto the phase change layer substrate, cooling it, and covering it with packaging material after the phase change material becomes solid, to obtain a complete phase change packaging board;

[0016] S3, putting the phase change packaging board and the thermal insulation layer together into a vacuum barrier film to obtain a phase change composite vacuum insulation panel to be evacuated;

[0017] S4, evacuate the vacuum to obtain a finished product of a phase change composite vacuum insulation panel.

[0018] In the preparation method as described above, preferably, in step S1, the stirring rate is 50-200 rpm, and the stirring time is 30-60 min.

[0019] In the preparation method as described above, preferably, the material of the phase change layer substrate is an aerogel ceramic fiberboard or an aerogel glass fiberboard; wherein the outer surface of the phase change layer substrate is coated with a hydrophobic material on five sides except the top;

[0020] The packaging material is hydrophobic aerogel ceramic fiber felt or hydrophobic aerogel glass fiber felt;

[0021] The heat insulation layer material is any one or two or more of aerogel ceramic fiberboard, aerogel glass fiberboard, fumed silica composite inorganic fiberboard, ceramic fiber felt or glass fiber felt.

[0022] Furthermore, the aerogel ceramic fiberboard or aerogel glass fiberboard can be prepared according to the following preparation method: 1. Prepare 130 parts of commercially available silica sol, 10 parts of aluminum silicate, 4 parts of dimethyldimethoxysilane, 10 parts of hydrochloric acid, 4 parts of silane coupling agent KH550, and 150 parts of deionized water by mass;

[0023] 2. Add aluminum silicate into deionized water and stir thoroughly until the aluminum silicate is dissolved and mixed evenly;

[0024] 3. Adding silica sol, dimethyldimethoxysilane and silane coupling agent to the aluminum silicate solution in sequence, stirring evenly, to obtain a mixed sol;

[0025] 4. Adjust the pH value of the mixed sol to 7;

[0026] 5. Completely immersing the above solution into ceramic or glass fiber mat, gelling and aging to obtain fiber-reinforced aerogel;

[0027] 6. Place the fiber-reinforced aerogel in a dry state, and evenly spray the hydrophobic agent methyltrimethoxysilane on the five surfaces of the outer surface of the board except the top, so as to obtain an aerogel ceramic fiberboard or an aerogel glass fiberboard.

[0028] In the preparation method described above, preferably, in step S2, the amount of phase change material used is 1.5-1.7 kg / m 2 The cooling treatment temperature is 4 to 8°C and the cooling time is 10 to 18 hours.

[0029] In the preparation method as described above, preferably, the thickness of the packaging material is 1 to 2 mm, and the thickness of the heat insulation layer is 10 to 20 mm.

[0030] In the preparation method as described above, preferably, in step S4, the vacuum degree of the vacuum extraction is 0.02-0.8 Pa.

[0031] (III) Beneficial effects

[0032] The beneficial effects of the present invention are:

[0033] The present invention provides a phase change material for construction, which has large latent heat of phase change and high cycle stability. As a hydrated salt phase change material for construction, it overcomes the problem of low enthalpy per unit volume / mass of phase change microcapsules used in traditional construction, and has the advantages of suitable phase change temperature and high cycle stability. The material is used to prepare vacuum insulation panels, and has a good thermal insulation effect.

[0034] The present invention also provides a method for preparing a phase-change composite vacuum insulation panel, specifically, encapsulating a phase-change material for construction in a phase-change layer matrix and a packaging material. The packaging structure has better thermal insulation performance than the traditional structure. It uses a five-sided hydrophobic fiber board as the matrix of the phase-change layer, which can ensure that the phase-change material will not leak when it is melted in liquid state, and can ensure the overall strength of the vacuum insulation panel. The phase-change layer of the phase-change material encapsulated by this structure does not need to be encapsulated using materials such as PET, and perfectly solves the leakage problem of hydrated salt phase-change materials used in buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the structure of the phase change layer matrix;

[0036] Figure 2 It is a schematic diagram of phase change material packaging;

[0037] Figure 3 It is a schematic diagram of the structure of a phase change composite vacuum insulation panel;

[0038] Figure 4 The cooling-heating curve of PCM1 of the product in Example 1 after 50 cooling and heating cycles;

[0039] Figure 5 The cooling-heating curve of PCM2 of the product in Example 2 after 50 cooling and heating cycles;

[0040] Figure 6 It is a comparison chart of the phase change layer test results of Example 1 and Comparative Example 2;

[0041] Figure 7 It is a comparison chart of the results of the finished VIP panels in Example 1, Example 2 and Comparative Example 3.

[0042] [Description of Reference Numerals]

[0043] 1: hydrophilic surface;

[0044] 2: Hydrophobic surface;

[0045] 3: Phase change layer packaging material;

[0046] 4: Phase change layer;

[0047] 5: Thermal insulation layer;

[0048] 6: Packaging bag. DETAILED DESCRIPTION

[0049] The present invention aims at the problem of low enthalpy per unit volume and leakage of existing phase change materials for construction, and provides a method for preparing a hydrated salt phase change material with suitable phase change temperature, high cycle stability and high enthalpy value, as well as its packaging method and application. The hydrated salt phase change material for construction described in the present invention can overcome the problem of low enthalpy per unit volume / mass of phase change microcapsules used in traditional buildings, and has the advantages of suitable phase change temperature and high cycle stability. At the same time, for the leakage problem of phase change materials, the present invention combines them with vacuum insulation panels, which perfectly solves the leakage problem of hydrated salt phase change materials used in construction.

[0050] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific embodiments. The raw materials used in the present invention can be commercially available products, such as vacuum barrier films that can be purchased from Sinoma Technology Co., Ltd.

[0051] Example 1

[0052] This embodiment prepares a building hydrated salt phase change material with large phase change latent heat and high cycle stability and a packaging method thereof, specifically comprising the following steps:

[0053] 1. Weighing:

[0054] Weigh 625 parts of anhydrous calcium chloride, 90 parts of sodium carbonate decahydrate, 65 parts of disodium hydrogen phosphate dodecahydrate, 590 parts of deionized water, 22 parts of strontium chloride hexahydrate, 2 parts of polyethylene glycol 600, 3 parts of carboxymethyl cellulose and 2 parts of urea.

[0055] 2. Preparation of Phase Change Materials

[0056] 590 parts of deionized water were placed in a constant temperature 60°C magnetic stirrer, and 625 parts of anhydrous calcium chloride, 90 parts of sodium carbonate decahydrate, and 65 parts of disodium hydrogen phosphate dodecahydrate were added in sequence; the mixture was stirred at a stirring rate of 60 rpm for 60 min, and then 22 parts of strontium chloride hexahydrate, 2 parts of polyethylene glycol 600, and 3 parts of carboxymethyl cellulose were added in sequence, and the mixture was stirred at 80 rpm for 55 min. Finally, 2 parts of urea were added, and the mixture was stirred at a stirring rate of 60 rpm for 30 min. The prepared liquid phase change material was recorded as PCM1 and placed in a 60°C oven to keep the mixture in a liquid state for later use;

[0057] 3. Packaging

[0058] The liquid phase change material prepared above is taken out of the oven, and the liquid phase change material is poured on the upper hydrophilic surface of the phase change layer substrate (aerogel glass fiber board, size 300×300 mm). The structural schematic diagram of the phase change layer substrate is shown in FIG. Figure 1 As shown, the upper surface of the phase change layer substrate is the hydrophilic surface 1 on the inner side (i.e., no treatment is done), and the other five outer surfaces are all hydrophobic surfaces 2, i.e., coated with hydrophobic material. After the phase change material covers the entire phase change layer substrate, the amount of the phase change material is 170 g, and it is placed in a low temperature environment of 4°C for cooling treatment. After cooling for 12 hours, the packaging material of the phase change layer (1 mm hydrophobic aerogel glass fiber felt) is placed on the hydrophilic surface of the phase change layer substrate aerogel glass fiber board, as shown in FIG. Figure 2 As shown, the phase change layer packaging material 3 is covered on the hydrophilic surface of the phase change layer matrix aerogel glass fiber board containing the phase change material to obtain a complete phase change packaging board as the phase change layer, and then the phase change layer is placed on top of the 15 mm thick insulation layer (aerogel glass fiber board), as shown in FIG. Figure 3 As shown, the phase change layer 4 and the thermal insulation layer 5 are placed together in the vacuum barrier film 6 to obtain a phase change composite vacuum insulation panel sample to be drawn;

[0059] 4. Finished Product

[0060] The phase change composite vacuum insulation panel samples were vacuumed using a vacuum packaging machine, and the vacuum degree was set to 0.02 Pa. After the vacuum packaging was completed, the finished phase change composite vacuum insulation panel was obtained.

[0061] The aerogel glass fiber board in this embodiment is prepared according to the following preparation method:

[0062] 1) Weigh 130 parts of commercially available silica sol, 10 parts of aluminum silicate, 10 parts of 36% hydrochloric acid, 4 parts of dimethyldimethoxysilane, 4 parts of KH550 brand silane coupling agent, and 150 parts of deionized water according to mass proportions;

[0063] 2) adding aluminum silicate weighed according to the ratio into deionized water, and stirring thoroughly until the aluminum silicate is dissolved and mixed evenly;

[0064] 3) Adding silica sol, dimethyldimethoxysilane and silane coupling agent to the inorganic additive solution in accordance with the proportions, stirring thoroughly after each addition, and finally obtaining a mixed sol;

[0065] 4) adjusting the pH value of the mixed sol to 7 with hydrochloric acid;

[0066] 5) completely impregnating the above solution into the glass fiber mat, gelling and aging at 45° C. for 30 h to obtain a fiber-reinforced aerogel;

[0067] 6) The fiber-reinforced aerogel is placed in a constant temperature oven at 110° C. and dried at normal pressure for 30 hours. Then, a hydrophobic agent methyltrimethoxysilane is evenly sprayed on the five outer surfaces of the board to obtain an aerogel glass fiber board.

[0068] Example 2

[0069] This embodiment prepares a building hydrated salt phase change material with large phase change latent heat and high cycle stability and a packaging method thereof, specifically comprising the following steps:

[0070] 1. Weighing

[0071] Weigh 640 parts of anhydrous calcium chloride, 100 parts of sodium carbonate decahydrate, 60 parts of disodium hydrogen phosphate dodecahydrate; 620 parts of deionized water; 23 parts of strontium chloride hexahydrate, 3 parts of polyethylene glycol 600, 2 parts of carboxymethyl cellulose, and 2 parts of urea;

[0072] 2. Preparation of Phase Change Materials

[0073] 620 parts of deionized water were placed in a constant temperature 60°C magnetic stirrer, and 640 parts of anhydrous calcium chloride, 100 parts of sodium carbonate decahydrate, and 60 parts of disodium hydrogen phosphate dodecahydrate were added in sequence; the mixture was stirred at a stirring rate of 70 rpm for 50 min, and then 23 parts of strontium chloride hexahydrate, 3 parts of polyethylene glycol 600, and 2 parts of carboxymethyl cellulose were added in sequence, and the mixture was stirred at 70 rpm for 60 min, and finally 2 parts of urea were added, and the mixture was stirred at a stirring rate of 60 rpm for 25 min, and a liquid phase change material sample was prepared, which was recorded as PCM2 and placed in a 60°C oven to keep the mixture in liquid state for later use;

[0074] 3. Packaging

[0075] The prepared liquid phase change material sample PCM2 is taken out from the oven, and the phase change material is poured onto the aerogel ceramic fiber board (300×300mm) as the phase change layer matrix. The amount of phase change material is 185g. After completion, it is placed in a low temperature of 4°C for cooling treatment. After cooling for 12 hours, the phase change material changes from liquid to solid and is stored in the matrix plate. The phase change layer packaging material, i.e., 1mm hydrophobic aerogel ceramic fiber felt, is placed on the hydrophilic surface of the phase change layer matrix aerogel ceramic fiber board to obtain a complete phase change packaging plate phase change layer. Then, the phase change packaging plate phase change layer and the insulation layer (15mm aerogel ceramic fiber board) are placed together in a vacuum barrier film to obtain a phase change composite vacuum insulation board sample to be drawn; wherein, the preparation method of the aerogel ceramic fiber board in this embodiment is the same as that in Example 1, except that the glass fiber felt is replaced by ceramic for preparation;

[0076] 4. Finished Product

[0077] The phase change composite vacuum insulation panel samples were vacuumed using a vacuum packaging machine, and the vacuum degree was set to 0.02 Pa. After the vacuum packaging was completed, the finished phase change composite vacuum insulation panel was obtained.

[0078] Comparative Example 1

[0079] This comparative example is based on Example 1, except that the nucleating agent for preparing the phase change material in the second step is only strontium chloride hexahydrate, and does not contain polyethylene glycol 600 and carboxymethyl cellulose. The prepared phase change material is recorded as PCM3.

[0080] Comparative Example 2

[0081] This comparative example is based on Example 1, except that in the third step of encapsulation, the structure of the phase change layer is changed, the phase change layer substrate is an aerogel glass fiber board, and the encapsulation material is a PET packaging bag, and its total thickness is consistent with the thickness of the phase change layer in Example 1. The phase change material is impregnated in the substrate, and the PET bag is encapsulated to obtain a phase change encapsulation board as the phase change layer.

[0082] Comparative Example 3

[0083] In this comparative example, the phase change material is prepared by the same method as in Example 1, and the phase change layer is replaced with the phase change layer of Comparative Example 2 prepared by the traditional packaging method, and then a vacuum insulation panel is obtained to obtain a finished vacuum insulation panel with the same total thickness as in Example 1.

[0084] The phase change material and phase change composite vacuum insulation panel prepared by the present invention have the following properties:

[0085] Enthalpy:

[0086] Differential scanning calorimetry was performed on PCM1, PCM2 and PCM3 in Example 1, Example 2 and Comparative Example 1, and the phase transition temperatures of PCM1, PCM2 and PCM3 were found to be 27.3°C, 27.1°C and 21.8°C, and the enthalpy values ​​were 206.3 J / g, 200.5 J / g and 135.5 J, respectively.

[0087] Because the application scenario of the phase change material developed in the present invention is the summer air-conditioning environment, the more suitable phase change temperature is 24-30°C. The phase change temperature and phase change enthalpy of PCM3 in Comparative Example 1 are 21.8°C and 135.5J / g, respectively. Compared with Examples 1 and 2, the phase change temperature of Comparative Example 1 is not suitable for the optimal temperature of the building, and the enthalpy value is also low. This shows that it is necessary to add nucleating agents polyethylene glycol 600 and carboxymethyl cellulose, which can adjust the phase change temperature of the phase change material and increase its enthalpy value.

[0088] The phase change layers prepared in Example 1 and Example 2 were placed on a heating table with a hot surface temperature of 80°C and a cooling table with a cold surface temperature of -10°C for cycle testing. The temperature data of the back surface was collected using a thermocouple. After 50 cycles, the heating and cooling curves were as follows: Figure 4 and Figure 5 It can be seen from the figure that after 50 hot and cold cycles, the melting temperature and solidification temperature of Example 1 and Example 2 are not much different. The supercooling degree of Example 1 is 1.1°C, and the supercooling degree of Example 2 is 0.85°C, which indicates that the phase change material prepared by the present invention has good cyclic stability.

[0089] The product prepared in Comparative Example 2 was placed on a heating table with a hot surface temperature of 80°C, and the cold surface was measured using a K-type thermocouple. The temperature-time curve was measured as follows: Figure 6 The conventional structure marked in the figure is the product of comparative example 2, and the new structure is the product of example 1. Figure 6 It can be seen that Example 1 and Comparative Example 2 each have a plateau at around 27°C, which proves that phase change occurs inside the phase change material at this temperature; at the same time, the plateau time of Example 1 is longer than that of Comparative Example 2, which indicates that the new structure is superior to the traditional structure in terms of thermal insulation performance.

[0090] The product prepared in Comparative Example 3 was placed on a heating table with a hot surface temperature of 80°C. The temperature of the back surface was collected using a K-type hot spot couple. The temperature-time curve was collected as shown in Figure 7 As shown, compared with Example 1 and Example 2, it can be seen that compared with the packaging structure described in the prior art comparative example 3, the packaging structures of Example 1 and Example 2 of the present invention obviously maintain a longer time in the plateau period, which indicates that the packaging structure of the present invention is better.

[0091] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any person skilled in the art can use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A phase change material for construction, characterized in that: The invention comprises 600-800 parts of a cooked phase change material, 20-30 parts of a nucleating agent and 1-5 parts of a temperature regulator by weight; wherein the cooked phase change material is a mixture of anhydrous calcium chloride, sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate; the nucleating agent is a mixture of strontium chloride hexahydrate, polyethylene glycol and carboxymethyl cellulose; and the temperature regulator is urea.

2. The phase change material for construction according to claim 1, characterized in that: The cooked phase change material is a mixture of 600-650 parts of anhydrous calcium chloride, 80-100 parts of sodium carbonate decahydrate and 50-80 parts of disodium hydrogen phosphate dodecahydrate.

3. The phase change material for construction according to claim 1, characterized in that: The nucleating agent is 20-23 parts of strontium chloride hexahydrate, 1-3 parts of polyethylene glycol and 1-3 parts of carboxymethyl cellulose, and the molecular weight of the polyethylene glycol is 600-800.

4. A phase change composite vacuum insulation panel, characterized in that: It includes a heat-insulating layer and a phase-change layer, wherein the heat-insulating layer is any one of an aerogel ceramic fiberboard, an aerogel glass fiberboard, a fumed silica composite inorganic fiberboard, a ceramic fiber felt board, and a glass fiber felt board; the phase-change layer includes a matrix, a phase-change material, and a packaging material, wherein the phase-change material is covered in the matrix, and the packaging material is covered on the phase-change material to form a phase-change layer; wherein the matrix is ​​an aerogel ceramic fiberboard or an aerogel glass fiberboard with five hydrophobic outer surfaces; the phase-change material is any one of a hydrated salt phase-change material and a composite hydrated salt phase-change material; the packaging material is a hydrophobic aerogel ceramic fiber felt or a hydrophobic aerogel glass fiber felt; the phase-change layer is placed on the heat-insulating layer and is packaged together in a vacuum barrier film to form a phase-change composite vacuum insulation panel.

5. A method for preparing a phase change composite vacuum insulation panel, characterized in that: It includes the following steps: S1. Stir and mix the cooked phase change material of any one of claims 1 to 3 with water; then add a nucleating agent and stir and mix; finally add a temperature regulator and stir to obtain a phase change material, which is placed in an environment of 50 to 60° C. to keep in a liquid state for later use; S2, pouring the liquid phase change material onto the phase change layer substrate, cooling it, and covering it with packaging material after the phase change material becomes solid, to obtain a complete phase change packaging board; S3, putting the phase change packaging board and the thermal insulation layer together into a vacuum barrier film to obtain a phase change composite vacuum insulation panel to be evacuated; S4, evacuate the vacuum to obtain a finished product of a phase change composite vacuum insulation panel.

6. The preparation method according to claim 5, characterized in that: In step S1, the stirring rate is 50-200 rpm, and the stirring time is 30-60 min.

7. The preparation method according to claim 5, characterized in that: The material of the phase change layer matrix is ​​aerogel ceramic fiberboard or aerogel glass fiberboard; the five outer surfaces of the phase change layer matrix except the top are coated with hydrophobic material; the packaging material is hydrophobic aerogel ceramic fiber felt or hydrophobic aerogel glass fiber felt; The heat insulation layer material is any one or two or more of aerogel ceramic fiberboard, aerogel glass fiberboard, fumed silica composite inorganic fiberboard, ceramic fiber felt or glass fiber felt.

8. The preparation method according to claim 5, characterized in that: In step S2, the amount of phase change material used is 1.5-1.7 kg / m 2 The cooling treatment temperature is 4 to 8°C and the cooling time is 1 to 18 hours.

9. The preparation method according to claim 5, characterized in that: The thickness of the packaging material is 1 to 2 mm, and the thickness of the heat insulation layer is 10 to 20 mm.

10. The preparation method according to claim 5, characterized in that: In step S4, the vacuum degree of the vacuum pumping is 0.02 Pa.

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