Thermal insulation and waterproof integrated phase change heat storage mortar and preparation method thereof

Abstract

The invention discloses thermal insulation and waterproof integrated phase change heat storage mortar and a preparation method thereof, and belongs to the technical field of building materials. The mortar is prepared from the following raw materials: cement, water, fine aggregate, shape-stabilized phase-change material super-hydrophobic silicon dioxide, a water reducing agent and polysorbate, the preparation method of the shape-stabilized phase change material-coated super-hydrophobic silicon dioxide comprises the following steps: S1, carrying out hydrophobic modification on diatomite to obtain hydrophobic modified diatomite; s2, adding n-hexadecane into the hydrophobic modified diatomite, and obtaining a shape-stabilized phase change material through a vacuum impregnation method; and S3, adding the shape-stabilized phase change material and the super-hydrophobic silicon dioxide into water, stirring, performing ultrasonic dispersion, and filtering and drying to obtain the shape-stabilized phase change material-coated super-hydrophobic silicon dioxide. The shape-stabilized phase-change material and super-hydrophobic silicon dioxide are doped into the mortar, so that the compressive strength, the thermal insulation performance and the waterproof performance of the mortar are remarkably improved, and the mortar has excellent durability.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and in particular relates to a thermal insulation and waterproof integrated phase change heat storage mortar and a preparation method thereof. Background Art

[0002] Against the backdrop of accelerating global urbanization and continued population growth, the building industry has become a major sector of global energy consumption, accounting for over 36% of total final energy consumption. Therefore, efforts to reduce building energy consumption are crucial for sustainable development. Thermal energy storage technology is an effective means of improving energy efficiency and conserving energy, bridging the temporal gap between energy supply and demand. Phase change materials (PCMs) can absorb or release thermal energy through phase transitions within a specific temperature range. Therefore, integrating PCMs into building materials has become widely used to improve the energy efficiency of buildings.

[0003] Although phase change materials (PCMs) have demonstrated advantages in building thermal energy storage, their solid-liquid phase transition properties are considered unsuitable for direct use in cement slurries. Encapsulation techniques are required to prevent direct contact with cement slurry. Shape stabilization of PCMs (shape-stabilized PCMs) is one of the most effective solutions. For example, Chinese patent CN119285291A discloses a novel waterproof, phase-change thermal insulation mortar and its preparation method. This invention utilizes a three-step process of calcination, acid washing, and hydrophobic modification to treat diatomaceous earth. This process, while reducing impurities and increasing pore volume, transforms the diatomaceous earth from its inherent hydrophilicity to a hydrophobic and oleophilic nature. This further enhances the diatomaceous earth's adsorption capacity for n-hexadecane, significantly increasing the thermal enthalpy and volume stability of the shape-stabilized PCM. However, this invention only utilizes physical adsorption (capillary action) and surface tension of the porous diatomaceous earth to adsorb the PCM. This open, "semi-encapsulated" approach cannot completely prevent leakage of the PCM. The leakage of phase change material will cause the increase of pores and gaps inside the mortar, and the leaked phase change material will directly physically isolate the cement particles and water, affecting the hydration reaction of the cement, thereby significantly reducing the strength of the mortar.

[0004] Although relevant research has shown that surface modification technology for porous materials can improve the interfacial binding energy between porous carriers and phase change materials and the embedding capacity of porous carriers, the semi-closed pore structure of porous materials cannot completely solve the leakage problem of phase change materials. In addition, after multiple hot and cold cycles, the deformation of the shaped phase change material will lead to an increase in pores and cracks in the cement material. This not only leads to leakage of the phase change material, but the migration and retention of water in these pores and channels will also have a serious impact on the performance and service life of the thermal insulation mortar. Therefore, it is urgent to develop methods for surface modification or surface modification of shaped phase change materials to achieve the reliable use and performance optimization of shaped phase change materials in building materials. Summary of the Invention

[0005] In view of the shortcomings of the above-mentioned prior art, one of the purposes of the present invention is to provide a thermal insulation and waterproof integrated phase change heat storage mortar. By adding a fixed-shape phase change material @superhydrophobic silica into the mortar, the compressive strength, thermal insulation performance and waterproof performance of the mortar are significantly improved, so that the mortar of the present invention has excellent durability.

[0006] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0007] A thermal insulation and waterproof integrated phase change heat storage mortar, comprising the following raw materials: cement, water, fine aggregate, shaped phase change material @superhydrophobic silica, water reducing agent, and polysorbate;

[0008] The preparation method of the shaped phase change material @ super hydrophobic silica comprises the following steps:

[0009] S1. The diatomaceous earth is hydrophobically modified to obtain hydrophobically modified diatomaceous earth;

[0010] S2. n-hexadecane was added to the hydrophobically modified diatomaceous earth and a shaped phase change material was obtained by vacuum impregnation;

[0011] S3. The shaped phase change material and super-hydrophobic silica were added to water, stirred, and then ultrasonically dispersed. The shaped phase change material @ super-hydrophobic silica was obtained after filtration and drying.

[0012] To address the problem that existing hydrophobic diatomaceous earth / n-hexadecane composite phase change materials cannot completely prevent leakage of phase change materials, causing cracks and reducing mortar strength, the present invention uses superhydrophobic silica particles to adsorb and wrap the shaped phase change material. A "protective shell" formed by hydrophobic silica particles is covered on the surface of the hydrophobic diatomaceous earth / n-hexadecane shaped phase change material, which can prevent leakage after the addition of cement material (whether during the mixing process or the subsequent cement hydration process), thereby improving the strength and thermal insulation performance of the mortar. Moreover, the prepared shaped phase change material @ superhydrophobic silica material exhibits superhydrophobicity, which can significantly improve the overall hydrophobicity of the phase change heat storage mortar, giving the mortar excellent durability and long-term stability.

[0013] Preferably, the particle size of the super-hydrophobic silica is 100-500 nm. When the particle size of the super-hydrophobic silica is too large, insufficient interface coverage will result, poor mechanical stability, and may cause leakage of part of the phase change material. When the particle size of the super-hydrophobic silica is too small, the super-hydrophobic silica will enter the liquid phase change material (forming an oil-in-water emulsion) and will not be able to cover the surface of the fixed phase change material.

[0014] Preferably, the mass ratio of the shaped phase change material to the superhydrophobic silica is 125:(18-36). When the content of superhydrophobic silica is too low, the shaped phase change material interface coverage is insufficient; when the content of superhydrophobic silica is too high, excessive adsorption of superhydrophobic silica leads to poor mechanical stability, which may cause the fluidity and workability of the subsequent thermal insulation mortar to deteriorate.

[0015] Preferably, in step S3, the stirring condition is: stirring at 40-60° C. for 0.5-1.5 h.

[0016] Preferably, the specific method of hydrophobically modifying diatomaceous earth in step S1 is as follows: pouring diatomaceous earth into an ethanol aqueous solution, mixing uniformly to obtain a mixed solution, adding acid to adjust the pH value of the mixed solution to 4.5-6; then stirring at 60-80° C. for 0.5-1 hour, adding a silane coupling agent and stirring for another 1-2 hours, and filtering and washing to obtain the hydrophobically modified diatomaceous earth.

[0017] Preferably, the mass ratio of the silane coupling agent to diatomaceous earth is 0.15:1.

[0018] Preferably, step S2 includes the following steps:

[0019] S201 weighed hydrophobically modified diatomaceous earth was vacuum treated;

[0020] S202 press liquid ratio 1: 4 liquid n-hexadecane and hydrophobically modified diatomaceous earth mixed, and the pressure was adjusted to 65kPa continued vacuum treatment for 60 minutes, followed by supplemental air adjusted to standard atmospheric pressure state;

[0021] S203. Repeatedly hot-filtering the mixture of n-hexadecane and hydrophobically modified diatomaceous earth until a granular sample is formed, and drying the granular sample to obtain the shaped phase change material.

[0022] Preferably, the mortar comprises the following raw materials in parts by weight: 500 parts of cement, 200-250 parts of water, 300-450 parts of fine aggregate, 143-161 parts of shaped phase change material @ super hydrophobic silica, 5-15 parts of water reducer, and 1-5 parts of polysorbate.

[0023] Another object of the present invention is to provide a method for preparing a thermal insulation and waterproof integrated phase change heat storage mortar, comprising the following steps:

[0024] P1. Weigh each component in parts by weight;

[0025] P2. The shaped phase change material @ super hydrophobic silica, water reducing agent and polysorbate were added to water and stirred to obtain a premix A;

[0026] P3. The cement and fine aggregate are stirred to obtain a premix B;

[0027] P4. The premix A and premix B are mixed evenly to obtain the mortar.

[0028] Compared with the prior art, the present invention is beneficial in that:

[0029] The present invention uses super-hydrophobic silica particles to adsorb and wrap the shaped phase change material. A layer of hydrophobic silica-like structure is adsorbed on the surface of the hydrophobic diatomaceous earth / n-hexadecane shaped phase change material, which can prevent leakage of the phase change material and improve the mechanical properties and corrosion resistance of the mortar. Moreover, the prepared shaped phase change material @ super-hydrophobic silica exhibits super-hydrophobicity, which can significantly improve the overall hydrophobicity of the phase change heat storage mortar, thereby making the mortar of the present invention have excellent durability and has very broad application prospects in the field of building insulation materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the process for preparing the shape-fixed phase change material @ super hydrophobic silica of the present invention;

[0031] Figure 2 This is a scanning electron microscope image of the shape-fixed phase change material of the present invention;

[0032] Figure 3 This is a scanning electron microscope image of the shaped phase change material @ 100nm super-hydrophobic silica of Example 1;

[0033] Figure 4 This is a contact angle test result diagram of the phase change thermal insulation mortar in Example 1;

[0034] Figure 5 This is a scanning electron microscope image of the shaped phase change material @500nm superhydrophobic silica of Example 2;

[0035] Figure 6 This is a contact angle test result diagram of the phase change thermal insulation mortar in Example 2;

[0036] Figure 7 This is a contact angle test result diagram of the phase change thermal insulation mortar of Example 3;

[0037] Figure 8 This is the contact angle test result of the phase change thermal insulation mortar of comparative example 1. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] The present invention provides a thermal insulation and waterproof integrated phase change heat storage mortar, comprising the following raw materials in parts by weight: 500 parts of cement, 200-250 parts of water, 300-450 parts of fine aggregate, 143-161 parts of shaped phase change material @ super hydrophobic silica, 5-15 parts of water reducer, and 1-5 parts of polysorbate;

[0040] The preparation method of the shaped phase change material @ super hydrophobic silica comprises the following steps:

[0041] S1. The diatomaceous earth is hydrophobically modified to obtain hydrophobically modified diatomaceous earth;

[0042] S2. n-hexadecane was added to the hydrophobically modified diatomaceous earth and a shaped phase change material was obtained by vacuum impregnation;

[0043] S3. The shaped phase change material and super-hydrophobic silica were added to water, stirred, and then ultrasonically dispersed. The shaped phase change material @ super-hydrophobic silica was obtained after filtration and drying.

[0044] The particle size of the super hydrophobic silica is 100-500 nm, for example, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, etc.

[0045] The mass ratio of the shaped phase change material to the superhydrophobic silica is 125:(18-36), for example, it can be 125:18, 125:20, 125:25, 125:30, 125:32, 125:34, 125:36, etc.

[0046] In step S3, the stirring condition is: stirring at 40-60° C. for 0.5-1.5 h.

[0047] Step S1 includes the following steps:

[0048] S101 diatomaceous earth was poured into an ethanol aqueous solution, mixed to obtain a mixture, and acid was added to adjust the pH value of the mixture to 4.5 to 6;

[0049] S102. The mixed solution is stirred in a water bath at 60-80° C. for 0.5-1 hour, a silane coupling agent is added, and the mixture is stirred for another 1-2 hours. The mixture is filtered and washed to obtain the hydrophobically modified diatomaceous earth. The mass ratio of the silane coupling agent to the diatomaceous earth is 0.15:1.

[0050] Step S2 includes the following steps:

[0051] S201 weighed hydrophobically modified diatomaceous earth was vacuum treated;

[0052] S202. Liquid n-hexadecane and hydrophobically modified diatomaceous earth were mixed at a material-liquid ratio of 1:4 and vacuum treatment was continued for 60 minutes at a pressure of 65 kPa. Air was then added to the mixture to return the mixture to standard atmospheric pressure. 60 minutes of vacuum treatment is the minimum time required for the hydrophobically modified diatomaceous earth to fully absorb the liquid n-hexadecane. Absorption does not increase if the mixture is subjected to vacuum treatment for longer than 60 minutes, while absorption is insufficient if the mixture is subjected to vacuum treatment for less than 60 minutes.

[0053] S203. Repeatedly hot-filtering the mixture of n-hexadecane and hydrophobically modified diatomaceous earth until a granular sample is formed, and drying the granular sample to obtain the shaped phase change material.

[0054] In the following examples and comparative examples, the cement is ordinary Portland cement P•O42.5, purchased from Hubei Huaxin Cement Co., Ltd.; the fine sand is 100-200 mesh quartz sand, purchased from Changsha Hongshun Mining Technology Co., Ltd.; the diatomaceous earth with a purity of CP is purchased from Shanghai Sinopharm Chemical Reagent Co., Ltd.; the n-hexadecane with a purity of AR is purchased from Wuhan Xinshenshi Chemical Technology Co., Ltd.; the superhydrophobic silica with a particle size of 100 and 500 nm is purchased from Shanghai Sinopharm Chemical Reagent Co., Ltd.; the polycarboxylate water reducer is PCA®-Ⅰ series polycarboxylate high-performance water reducer, purchased from Jiangsu Subote New Materials Co., Ltd.; the polysorbate with a purity of CP is purchased from Wuhan Xinshenshi Chemical Technology Co., Ltd.; and the water is tap water that meets the requirements of "JGJ 63-2006 Standard for Water for Concrete".

[0055] Example 1

[0056] This embodiment provides a thermal insulation and waterproof integrated phase change heat storage mortar, which includes the following raw materials in parts by weight: 500 parts of cement, 225 parts of water, 375 parts of fine sand, 143 parts of shaped phase change material @ super hydrophobic silica, 10 parts of polycarboxylate water reducer, and 2 parts of polysorbate;

[0057] Among them, such as Figure 1 As shown, the preparation method of the shaped phase change material @ super hydrophobic silica includes the following steps:

[0058] S1. 100g of diatomaceous earth was added to 880ml of a 1:1 (volume ratio) mixture of anhydrous ethanol and water. Acetic acid was added dropwise to adjust the mixture to a pH of 4. After pre-stirring in a 70°C water bath for 30 minutes, 15g of a silane coupling agent, KH-570, was added and stirred for 1.5 hours. The mixture was washed, filtered, and dried to obtain the hydrophobically modified diatomaceous earth.

[0059] S2. Weigh 100g of hydrophobically modified diatomaceous earth into a filtration flask, connect it to a circulating water vacuum pump, and expel the air from the pores of the diatomaceous earth for 20 minutes. Then, flow 400g of liquid n-hexadecane into the filtration flask to cover the hydrophobically modified diatomaceous earth sample. Vacuum treatment is continued at a vacuum pressure of 65kPa for 60 minutes, and then air is added to adjust the pressure to standard atmospheric pressure. The n-hexadecane and hydrophobically modified diatomaceous earth mixture is then repeatedly hot-filtered until a granular sample forms. The granular sample is vacuum-dried at 70°C for 12 hours at a vacuum degree of 65kPa to obtain a n-hexadecane / diatomaceous earth shaped phase change material. The scanning electron microscope image is shown in FIG. Figure 2 As shown;

[0060] S3. 18g of super-hydrophobic silica (100nm particle size) and 125g of n-hexadecane / diatomaceous earth shape-fixed phase change material were added to 1500ml of pure water. The mixture was stirred at 40°C for 60 minutes and then ultrasonically dispersed to obtain a shape-fixed phase change material and super-hydrophobic silica mixture. The mixture was then filtered and dried to obtain a shape-fixed phase change material @100nm super-hydrophobic silica. The scanning electron microscope image is shown below. Figure 3 shown.

[0061] By comparison Figure 2 and Figure 3 It can be seen that 100nm super-hydrophobic silica particles are adsorbed and wrapped on the surface of the n-hexadecane / diatomaceous earth shaped phase change material through hydrophobic interaction. A "protective shell" formed by hydrophobic silica particles is covered on the surface of the shaped phase change material, which can prevent leakage after the addition of cement material.

[0062] The preparation method of the thermal insulation and waterproof integrated phase change heat storage mortar of this embodiment includes the following steps:

[0063] P1. Weigh each component in parts by weight;

[0064] P2. The shaped phase change material @ 100nm super hydrophobic silica, water reducer and polysorbate were added to water and stirred to obtain a premix A;

[0065] P3. Mix the cement and fine sand to obtain premix B;

[0066] P4. Mix premix A and premix B evenly to obtain phase change thermal insulation mortar.

[0067] Example 2

[0068] The thermal insulation and waterproof integrated phase change heat storage mortar of this embodiment is basically the same as that of Example 1, except that the particle size of the super hydrophobic silica is 500 nm, and a shaped phase change material @ 500 nm super hydrophobic silica is obtained. The scanning electron microscope image is as follows: Figure 5 shown.

[0069] Example 3

[0070] The thermal insulation and waterproof integrated phase change heat storage mortar of this embodiment is basically the same as that of Example 1, with the only difference being that, in step S3, the mass of superhydrophobic silica (particle size of 100 nm) is 36 g, that is, the mass ratio of n-hexadecane / diatomaceous earth shaped phase change material to superhydrophobic silica in Example 3 is 125:36.

[0071] Comparative Example 1

[0072] This comparative example provides a thermal insulation and waterproof integrated phase change heat storage mortar, which includes the following raw materials in parts by weight: 500 parts of cement, 225 parts of water, 375 parts of fine sand, 143 parts of shaped phase change material, 10 parts of polycarboxylate water reducer, and 2 parts of polysorbate;

[0073] The preparation method of the shape-fixed phase change material comprises the following steps:

[0074] S1. 100g of diatomaceous earth was added to 880ml of a 1:1 (volume ratio) mixture of anhydrous ethanol and water. Acetic acid was added dropwise to adjust the mixture to a pH of 4. After pre-stirring in a 70°C water bath for 30 minutes, 15g of a silane coupling agent, KH-570, was added and stirred for 1.5 hours. The mixture was filtered and washed to obtain the hydrophobically modified diatomaceous earth.

[0075] S2. Weigh 100g of hydrophobically modified diatomaceous earth into a filtration flask, connect it to a circulating water vacuum pump, and expel the air from the pores of the diatomaceous earth for 20 minutes. Then, 400g of liquid n-hexadecane was poured into the filtration flask to cover the hydrophobically modified diatomaceous earth sample. The vacuum treatment was continued at a vacuum pressure of 65kPa for 60 minutes, and then air was added to adjust the pressure to standard atmospheric pressure. The n-hexadecane and hydrophobically modified diatomaceous earth mixture was then repeatedly hot-filtered until a granular sample appeared. The granular sample was vacuum-dried at 70°C for 12 hours at a vacuum degree of 65kPa to obtain a n-hexadecane / diatomaceous earth shaped phase change material.

[0076] The preparation method of the mortar is the same as that of Example 1;

[0077] That is, compared with Example 1, this comparative example does not use super-hydrophobic silica, and directly uses n-hexadecane / diatomaceous earth shaped phase change material to prepare mortar.

[0078] Test example

[0079] The phase change thermal insulation mortars prepared in Examples 1-3 and Comparative Example 1 were respectively poured into test molds to prepare test specimens. After being covered with plastic film, they were cured with the molds at a temperature of 25°C and a relative humidity of 95% for one day, and then the molds were removed and the curing was continued for 28 days. After the curing was completed, the performance of the specimens was tested.

[0080] The following tests were performed on the phase change heat storage mortars provided in Examples 1-3 and Comparative Example 1:

[0081] Contact angle test: Using the SDC-200S instrument (Guangdong Dayint Intelligent Technology Co., Ltd.), a 5 μL water droplet was taken for each test.

[0082] According to the national standard GB / T 20473-2021 "Building Thermal Insulation Mortar", the compressive strength and softening coefficient of the specimens are tested, and the specimen specifications are 70.7mm×70.7mm×70.7mm.

[0083] According to the national standard GB / T 10294-2008 “Insulation materials - Determination of steady-state thermal resistance and related properties - Guarded hot plate method”, the thermal conductivity of the sample was tested using a TPMBE-3030 flat plate thermal conductivity meter. The specimen size was 300mm×300mm×30mm.

[0084] The test results are shown in Table 1 below:

[0085] Table 1 Properties of phase change thermal insulation mortar

[0086]

[0087] As shown in the test results in Table 1, the waterproof and thermal insulation mortars prepared in Examples 1-3 all exhibit superior overall performance compared to Comparative Example 1, including high waterproofing, high thermal insulation, and higher compressive strength. This demonstrates that the present invention utilizes superhydrophobic silica to adsorb and encapsulate a shaped phase change material, resulting in a shaped phase change material @ superhydrophobic silica that significantly improves the compressive strength, thermal insulation, and overall hydrophobicity of the mortar.

[0088] By comparing the experimental results of Examples 1 and 2, it can be seen that the use of 100nm super-hydrophobic silica has a more significant effect on improving the thermal insulation performance, compressive strength and overall hydrophobicity of the mortar than 500nm super-hydrophobic silica.

[0089] By comparing the experimental results of Examples 1 and 3, it can be seen that when the mass ratio of the shaped phase change material to the superhydrophobic silica is 18:125, the improvement effect on the thermal insulation performance, compressive strength and overall hydrophobicity of the mortar is more significant; when the content of superhydrophobic silica is too low, the interface coverage of the shaped phase change material will be insufficient; when the content of superhydrophobic silica is too high, the adsorption of excessive superhydrophobic silica will lead to poor mechanical stability, which may cause the fluidity and working performance of the subsequent preparation of thermal insulation mortar to deteriorate.

[0090] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A thermal insulation and waterproof integrated phase change heat storage mortar, characterized in that: It includes the following raw materials: Cement, water, fine aggregate, shaped phase change material @ super hydrophobic silica, water reducer, polysorbate; The preparation method of the shaped phase change material @ super hydrophobic silica comprises the following steps: S1. The diatomaceous earth is hydrophobically modified to obtain hydrophobically modified diatomaceous earth; S2. n-hexadecane was added to the hydrophobically modified diatomaceous earth and a shaped phase change material was obtained by vacuum impregnation; S3. The shaped phase change material and super-hydrophobic silica were added to water, stirred, and then ultrasonically dispersed. The shaped phase change material @ super-hydrophobic silica was obtained after filtration and drying.

2. The thermal insulation and waterproof integrated phase change heat storage mortar according to claim 1, characterized in that: The particle size of the super hydrophobic silica is 100-500 nm.

3. The thermal insulation and waterproof integrated phase change heat storage mortar according to claim 1, characterized in that: The mass ratio of the shaped phase change material to the superhydrophobic silica is 125:(18-36).

4. The thermal insulation and waterproof integrated phase change heat storage mortar according to claim 1, characterized in that: In step S3, the stirring condition is: stirring at 40-60° C. for 0.5-1.5 h.

5. The thermal insulation and waterproof integrated phase change heat storage mortar according to claim 1, characterized in that: The specific method of step S1 for hydrophobically modifying diatomite is as follows: pouring diatomite into an ethanol aqueous solution, mixing uniformly to obtain a mixed solution, adding acid to adjust the pH value of the mixed solution to 4.5-6; then stirring at 60-80° C. for 0.5-1 hour, adding a silane coupling agent and stirring for another 1-2 hours, and filtering and washing to obtain the hydrophobically modified diatomite.

6. The thermal insulation and waterproof integrated phase change heat storage mortar according to claim 5, characterized in that: The mass ratio of the silane coupling agent to diatomaceous earth is 0.15:

1.

7. The thermal insulation and waterproof integrated phase change heat storage mortar according to claim 1, characterized in that: Step S2 includes the following steps: S201 weighed hydrophobically modified diatomaceous earth was vacuum treated; S202 press liquid ratio 1: 4 liquid n-hexadecane and hydrophobically modified diatomaceous earth mixed, and adjust the pressure to 65kPa continued vacuum treatment for 60 minutes; S203. Repeatedly hot-filtering the mixture of n-hexadecane and hydrophobically modified diatomaceous earth until a granular sample is formed, and drying the granular sample to obtain the shaped phase change material.

8. The thermal insulation and waterproof integrated phase change heat storage mortar according to claim 1, characterized in that: The mortar includes the following raw materials in parts by weight: 500 parts of cement, 200-250 parts of water, 300-450 parts of fine aggregate, 143-161 parts of shaped phase change material @ super hydrophobic silica, 5-15 parts of water reducer, and 1-5 parts of polysorbate.

9. The method for preparing the thermal insulation and waterproof integrated phase change heat storage mortar according to any one of claims 1 to 8, characterized in that: The following steps are involved: P1. Weigh each component in parts by weight; P2. The shaped phase change material @ super hydrophobic silica, water reducing agent and polysorbate were added to water and stirred to obtain a premix A; P3 the cement and fine aggregate are mixed to obtain a premix B; P4. The premix A and premix B are mixed evenly to obtain the mortar.

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