WO2022257340A1

WO2022257340A1 - Phase change building material product with temperature control performance and preparation method therefor

Info

Publication number: WO2022257340A1
Application number: PCT/CN2021/127552
Authority: WO
Inventors: 王兵; 杨正波; 李帆; 陈红霞; 张赫; 丛宇
Original assignee: 中建材创新科技研究院有限公司
Priority date: 2021-06-07
Filing date: 2021-10-29
Publication date: 2022-12-15
Also published as: CN113414869A

Abstract

A phase change building material product with a temperature control performance and a preparation method therefor. According to the preparation method, before the preparation of the phase change building material product with the temperature control performance and during the preparation of a phase change microcapsule solution, the phase change microcapsule is in an environment below the phase change temperature, such that a phase change material is in a solid state. Before the preparation of the phase change building material product with the temperature control performance, the phase change microcapsule is placed in an environment below the phase change temperature for a period of time, so as to ensure that the phase change material is in a solid state, wherein the time for which same is placed is 5 hours to 1 month; the time for which same is placed can be 8 days to 20 days, or 12 hours to 2 days; and the temperature of the environment below the phase change temperature can be lower than the phase change temperature by 5ºC or more. The preparation method avoids the leakage of the phase change material, such that the obtained phase change building material product can adjust the indoor temperature and has a higher strength.

Description

A phase change building material product with temperature control performance and its preparation method

technical field

This article relates to but not limited to the field of building material products, especially relates to but not limited to a phase change building material product with temperature control performance and its preparation method.

Background technique

As a new type of wall energy-saving technology, phase change energy storage wall can not only improve the thermal insulation performance of the wall, but also improve the heat storage and heat storage performance of the wall, and improve the indoor thermal environment of the building, but the phase change energy storage The material is encapsulated in the building material product, and it should be ensured that the phase change building material product does not leak out of the phase change energy storage material during use, so as to realize the application of the phase change energy storage material in the field of building materials. Common building material products in the field of building materials include, but are not limited to, gypsum boards, gypsum blocks, plastering gypsum, self-leveling mortar, gypsum battens, and concrete.

At present, the preparation methods of phase change energy storage gypsum board can be divided into three types: impregnation method, direct mixing method, and encapsulation method. Although the impregnation method and the direct mixing method are simple in preparation process, phase change materials are prone to exudation, so they are rarely used in actual production. Encapsulation methods include micro-encapsulation and macro-encapsulation. Macro-encapsulation affects the breathing performance of gypsum boards. If the encapsulation is not perfect, flammable damage will occur and the scene of leakage. However, micro-encapsulation is generally in the form of microcapsules, although microcapsules The phase change material has been encapsulated, but when the phase change microcapsules are mixed with gypsum and water, friction or shear force will be generated, and the physical action will also damage the phase change microcapsules, resulting in leakage of the phase change material.

Therefore, there is a need in the art for a phase change building material product containing no leakage of the phase change material and a preparation method thereof.

Summary of the invention

The following is an overview of the topics described in detail in this article. This summary is for the purpose of fully explaining the purpose of the application and not intended to limit the protection scope of the application.

The application provides a phase change building material product with temperature control performance and a preparation method thereof. The phase-change building material product with temperature control performance of the present application can adjust the indoor temperature and the phase-change material does not leak, ensuring the safety of the phase-change building material product; The advanced preparation process enables building material products to obtain higher strength.

In an embodiment of the present application, a method for preparing a phase-change building material product with temperature-controlling properties is provided, the preparation method comprising phase-change microcapsules before and after preparing the phase-change building material product with temperature-controlling properties The phase change microcapsule or phase change microcapsule solution is in an environment lower than the phase change temperature, so that the phase change material is in a solid state.

In some embodiments of the present application, before preparing the phase change building material product with temperature control properties, the phase change microcapsules are placed in an environment lower than the phase change temperature for a period of time to ensure that the phase change material is in a solid state; And wherein the storage time is 5h to one month; the storage time can be 29 days to 10 days; the storage time can be 25 days to 9 days; the storage time can be 20 days to 8 days; the storage time It can be 15 days to 8 days; the storage time can be 10 days to 5 days; the storage time can be 5 days to 1 day; the storage time can be 3 days to 23h; the storage time can be 2 day to 12h; and the temperature of the environment lower than the phase transition temperature may be lower than the phase transition temperature by more than 5°C.

In some embodiments of the present application, the storage time can be one month, 29 days, 28 days, 27 days, 26 days, 25 days, 24 days, 23 days, 22 days, 21 days, 20 days, 19 days, 18 days, 17 days, 16 days, 15 days, 14 days, 13 days, 12 days, 11 days, 10 days, 9 days, 8 days, 7 days, 6 days, 5 days, 4 days, 3 days, 2 days , 24h, 23h, 22h, 21h, 20h, 19h, 18h, 17h, 16h, 15h, 14h, 13h, 12h, 11h, 10h, 9h, 8h, 7h, 6h, 5h or any range between two values or value.

In some embodiments of the present application, the phase-change microcapsules are in solid powder form; or the phase-change microcapsules are in liquid form.

In some embodiments of the present application, when the phase-change microcapsules are solid powders, the phase-change microcapsules in the form of solid powder in an environment lower than the phase transition temperature are mixed with water to make the phase-change microcapsules in the form of solid powder The phase change microcapsules are evenly distributed in water to form a phase change microcapsule solution; the temperature of the water used in the phase change microcapsule solution is lower than the phase change temperature; when the phase change microcapsules are in liquid form, the phase change microcapsules in liquid form The microcapsules are in an environment lower than the phase change temperature to ensure that the phase change material in the phase change microcapsules is in a solid state; and preserve the phase change microcapsules, the water used to prepare the phase change microcapsule solution or preserve the The temperature of the phase change microcapsules in liquid form can be lower than the phase change temperature by more than 5°C.

In some embodiments of the present application, the phase change microcapsules have an enthalpy retention rate of 60% to 99%, an enthalpy value of 50J/g to 200J/g, and an average particle size of 0.1 μm to 20 μm, or the average The particle size is 0.1 μm to 10 μm, and the phase transition temperature is 15°C to 30°C.

In some embodiments of the present application, the solid content of the phase-change microcapsule solution is 20% to 60%, so as to ensure that the solution has better fluidity.

In some embodiments of the present application, the solid content of the phase change microcapsules is 10% to 70%.

In some embodiments of the present application, the solid content of the phase change microcapsules is 20% to 60%.

In some embodiments of the present application, the solid content of the phase change microcapsules is 25% to 60%.

In some embodiments of the present application, the solid content of the phase change microcapsules is 30% to 60%.

In some embodiments of the present application, the solid content of the phase change microcapsules is 35% to 60%.

In some embodiments of the present application, the solid content of the phase change microcapsules is 40% to 60%.

In some embodiments of the present application, the solid content of the phase change microcapsules is 45% to 60%.

The solid content is the mass percentage of the remaining part of the emulsion or coating after drying under specified conditions.

In some embodiments of the present application, the phase-change microcapsules include a core material and a wall material; and wherein the core material and the wall material are any one or both of inorganic substances and organic substances.

In some embodiments of the present application, the core material is any one or more of alcohol compounds, organic acid compounds, ester compounds and alkane compounds.

In some embodiments of the present application, the core material is any one or more of paraffin, capric acid, caprylic acid, butyl stearate, polyethylene glycol, lauryl alcohol and n-octane.

On the other hand, the present application provides phase-change building material products with temperature control properties prepared by the above preparation method, the phase-change building material products include phase-change gypsum board, phase-change gypsum block, phase-change putty, phase-change self-leveling Mortar, phase change stone slats and phase change concrete.

In yet another aspect, the application provides a phase-change gypsum board with temperature-controlling properties prepared by the above-mentioned preparation method, with gypsum accounting for 100 parts by weight, phase-change microcapsules: binder: face-protecting paper: water The weight ratio is (5 to 50):(0.1 to 1):(0.05 to 0.1):(55 to 95).

In the embodiment of the present application, the phase-change gypsum board also includes a reinforcing agent, and the weight ratio of the phase-change microcapsule: the binder: the reinforcing agent: the protective paper: the water is ( 5 to 50):(0.1 to 1):(0.05 to 5):(0.05 to 0.1):(55 to 95).

In the embodiment of the present application, the phase-change gypsum board further includes a water-reducing agent, the phase-change microcapsule: the binder: the strengthening agent: the water-reducing agent: the face-protecting paper: the The weight ratio of said water is (5 to 50): (0.1 to 1): (0.05 to 5): (0.05 to 5): (0.05 to 0.1): (55 to 95).

In the embodiment of the present application, the phase-change gypsum board also includes a surfactant, the phase-change microcapsule: the binder: the reinforcing agent: the water reducing agent: the surfactant: the Said facial protection paper: the weight ratio of the water is (5 to 50): (0.1 to 1): (0.05 to 5): (0.05 to 5): (0.05 to 5): (0.05 to 0.1): (55 to 95).

In some embodiments of the present application, the binder is any one or more of corn starch, modified corn starch, tapioca starch and pregelatinized starch; the viscosity of the above starch is 1000mPa·s to 5000mPa·s s. The test method in the Chinese chemical industry standard HG/T 3932-2007 was adopted, the sample concentration was 5%, the temperature was 25°C, the rotor number was 3, and the speed was 6r/min.

In some embodiments of the present application, the reinforcing agent is any one or more of glass fibers, carbon fibers, wollastonite and gypsum whiskers.

In some embodiments of the present application, the water reducer is lignosulfonate-based water reducer, naphthalene-based high-efficiency water-reducer, melamine-based high-efficiency water-reducer, sulfamate-based high-efficiency water-reducer Any one or more of superplasticizers, fatty acid-based superplasticizers, and polycarboxylate-based superplasticizers.

In some embodiments of the present application, the surfactant is any one or more of sodium linear alkylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, and ammonium fatty alcohol polyoxyethylene ether sulfate.

In some embodiments of the present application, the phase change gypsum board is obtained through the following steps:

(1) Plaster of paris and binding agent; And optionally reinforcing agent are fully mixed to form a dry powder;

(2) preparing the phase-change microcapsules of solid powder as a phase-change microcapsule solution or preparing the phase-change microcapsules in liquid form as a phase-change microcapsule solution in a stand-by form;

(3) mixing an optional water reducing agent, an optional surfactant, and water to form a wet material;

(4) fully mixing the dry powder material, the phase change microcapsule solution and the wet material to form a slurry; and

(5) placing the slurry in the middle of the protective paper, cutting and drying to form a phase-change gypsum board with temperature control properties; and

Wherein, before preparing the phase change building material product with temperature control performance, the phase change microcapsules are placed in an environment lower than the phase change temperature for a period of time to ensure that the phase change material is in a solid state; and

Wherein the placement time is 5h to one month; the placement time can be 29 days to 10 days; the placement time can be 25 days to 9 days; the placement time can be 20 days to 8 days; the placement time can be It is 15 days to 8 days; the storage time can be 10 days to 5 days; the storage time can be 5 days to 1 day; the storage time can be 3 days to 23h; the storage time can be 2 days to 12h; and

The temperature of the environment lower than the phase transition temperature may be more than 5°C lower than the phase transition temperature; and

A binder and optionally a reinforcing agent may not be mixed into the plaster of paris in step (1); the binder and optionally a reinforcing agent are mixed in step (3).

In yet another aspect, the present application provides an application of a phase-change gypsum board with temperature control properties in room partition walls or suspended ceilings.

In yet another aspect, the application provides a phase-change gypsum block with temperature-controlling properties prepared by the above-mentioned preparation method. Based on 100 parts by weight of plaster, the weight ratio of phase-change microcapsules: water is: (5 to 50 ): (55 to 95); the phase-change gypsum block with temperature control performance can also include binder, reinforcing agent, water reducer, surfactant, etc., wherein phase-change microcapsules: water: binder :Strengthening agent:Water reducer:Surfactant The weight ratio is (5 to 50):(55 to 95):(0.1 to 1):(0.05 to 5):(0.05 to 5):(0.05 to 5) .

In yet another aspect, the application provides phase-change plastering gypsum with temperature-controlling properties prepared by the above-mentioned preparation method, taking 100 parts by weight of plaster, phase-change microcapsules: cellulose ether: the weight ratio of water is ( 5 to 50): (0.01 to 0.5): (25 to 75); the phase change plastering gypsum with temperature control performance can also include retarder, cement, etc., wherein phase change microcapsules: cellulose ether: retarder Coagulant: cement: the weight of water is (5 to 50): (0.01 to 0.5): (0.01 to 1): (0.01 to 1): (25 to 75).

In another aspect, the application provides a phase-change self-leveling mortar with temperature control properties prepared by the above-mentioned preparation method, taking 100 parts by weight of plaster, phase-change microcapsules: rheology modifier: weight ratio of water It is (5 to 50): (0.01 to 0.5): (25 to 75); the phase change self-leveling mortar with temperature control performance can also include filler, cellulose ether, reinforcing agent, water reducer, surface Activator, defoamer etc., wherein, phase change microcapsule: rheology modifier: water: filler: cellulose ether: strengthening agent: water reducer: surfactant: the weight of defoamer is (5 to 50):(0.01 to 0.5):(25 to 75):(1:30):(0.1 to 5):(0.05 to 5):(0.05 to 5):(0.05 to 5):(0.05 to 5) .

The phase change microcapsules included in this application require storage and use below the phase change temperature. The phase-change building material products prepared by this application fuse phase-change microcapsules with building materials, and the low-temperature preparation process enables the phase-change building material products to obtain higher strength, and the microscopic observation of the phase-change microcapsules does not leak, ensuring that the phase-change building material products are used safety.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. Other advantages of the present application can be realized and obtained through the schemes described in the specification and drawings.

Figure overview

The accompanying drawings are used to provide an understanding of the technical solution of the present application, and constitute a part of the description, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

Figure 1 is a photo of the color change on the surface of the gypsum board after the phase-change gypsum board prepared in Example 2 and the comparative example were placed in an oven at 45°C and baked for 24 hours.

After baking for 24 hours, the face paper of the gypsum board prepared by the embodiment is the natural color, while the face paper prepared by the comparative example has been impregnated with oil, indicating that the phase change microcapsules used in the preparation method of the comparative example have not played a sealing phase. Due to the role of the change material, the paraffin wax in the phase change microcapsules has leaked and migrated to the surface of the protective paper, which has the potential to volatilize and affect the quality of the gypsum board.

Fig. 2 is an electron microscope image of the morphology of phase-change gypsum boards prepared in Example 2 and Comparative Example.

The phase-change microcapsules of Example 2 still completely exist between the gypsum crystals, and the gypsum crystals basically do not change greatly; while the phase-change microcapsules of the comparative example are damaged, and the gypsum crystals also undergo significant changes, and the crystals change Short and trivial with reduced intensity.

Figure 3 is an electron microscope image of gypsum hardened slurry prepared by slurrying gypsum board at 15°C and 40°C. It can be seen from the figure that the high temperature makes the crystals grow and become larger, and the overlap between the crystals is loose; but the low temperature makes the crystals compact, elongated and tightly clustered and strengthens the crystal strength.

FIG. 4 is a graph corresponding to the gypsum board of FIG. 3 . Wherein, A is the average Young's modulus-indentation depth curve of the gypsum board corresponding to FIG. 3 . The ordinate is Young's modulus (GPa), and the abscissa is displacement (nm). B is the average hardness-indentation depth graph of the gypsum board corresponding to FIG. 3 . The ordinate is the hardness (GPa), and the abscissa is the displacement (nm). HT: high temperature (40°C). LT: low temperature (15°C).

It can be seen from Figure 4 that although the uniformity of the samples is poor, especially the low-temperature samples, the Young's modulus and hardness of the low-temperature samples are significantly greater than those of the high-temperature samples, indicating that the gypsum crystals prepared at low temperatures have higher strength.

detail

The embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

Material :

Plaster of paris: building gypsum, Ninghai Beixin Building Materials Co., Ltd.;

Protective paper: Shandong Bohui Paper Co., Ltd.; 180g/m ² ;

Phase-change microcapsules: prepared according to the method steps described in the examples of patent ZL200810103749.3;

Chopped glass fiber: China Jushi Co., Ltd., length 6mm;

Binder: Shenyang Xuegong Adhesive Technology Co., Ltd., modified corn starch;

Naphthalene-based high-efficiency water reducer: Laiwu Dongfuxiang Chemical Co., Ltd., the brand is FDN-A.

Examples and comparative examples

Embodiment and comparative example formula

熟石膏plaster of paris	100份100 copies
护面纸facial tissue	2份2 copies
水water	75份75 copies
相变微胶囊 Phase Change Microcapsules	15份15 copies
粘结剂binder	0.6份0.6 parts
短切玻璃纤维chopped glass fiber	0.5份0.5 parts
萘系减水剂Naphthalene superplasticizer	0.05份0.05 parts
十二烷基硫酸钠Sodium dodecyl sulfate	0.1份0.1 part

Example 1:

The phase-change microcapsules are prepared according to the patent ZL200810103749.3 paragraphs [0009] to [0015] to prepare microcapsules of inorganic phase-change energy storage materials by the gel sol method; the difference is that the phase-change microcapsules prepared by the present application are Single-layer phase-change microcapsules; the phase-change microcapsules are a solution with a solid content of 35%; the enthalpy is about 120J/g; the average particle size is 5μm;

According to the above formula, fully mix the plaster of paris, modified starch and chopped glass fiber to form a dry powder;

The phase change temperature of the phase change microcapsules is 20°C to 25°C, in an environment of 15°C;

Mix naphthalene-based water reducer, sodium lauryl sulfate and 5 parts of water to form a wet material;

Fully mix the dry powder material, phase change microcapsule solution, wet material and 70 parts of water to form a slurry;

The slurry is placed in the middle of the protective paper, cut and dried to form a phase-change gypsum board with temperature control performance.

Example 2

The phase-change microcapsules are prepared as microcapsules of organic phase-change energy storage materials according to paragraphs [0009] to [0015] of patent ZL200810103749.3; the difference is that the phase-change microcapsules prepared by the present application are single phase-change microcapsules layer; the phase-change microcapsules are a solution with a solid content of 35%; the enthalpy is about 120J/g; the average particle size is 5μm;

Example 3:

The phase change microcapsules are prepared by combining the in-situ polymerization method and the sol-gel method in Example 3 of the patent ZL200810103749.3 to prepare microcapsules with double-layer composite functional shells encapsulating organic phase change energy storage materials; the phase change microcapsules are powder , the enthalpy value is about 120J/g; the average particle size is 5μm;

The phase change temperature of the phase change microcapsules is 20°C to 25°C, in an environment of 15°C; mix the phase change microcapsules with 25 parts of water, and the water temperature is 15°C, so that the phase change materials are evenly distributed in the water to form phase change microcapsules solution;

Fully mix the dry powder material, phase change microcapsule solution, wet material and 45 parts of water to form a slurry;

Comparative example:

The phase change temperature of the phase change microcapsules is 20°C to 25°C, in an environment of 25°C; mix the phase change microcapsules with 25 parts of water, and the water temperature is 25°C, so that the phase change materials are evenly distributed in the water to form phase change microcapsules solution;

Performance Testing

According to the Chinese national standard GB/T 9775-2008 "Gypsum board with paper surface", the properties of the phase-change gypsum board prepared in the examples and comparative examples were tested, and the results are shown in Table 1.

The performance of the phase-change gypsum board with temperature control performance prepared in Table 1 Example 2 and the gypsum board prepared in the comparative example

the	纵向断裂载荷/NLongitudinal breaking load/N	横向断裂载荷/NTransverse breaking load/N
实施例2Example 2	609609	275275
对比例comparative example	583583	258258
GB/T 9775-2008《纸面石膏板》GB/T 9775-2008 "Paper Gypsum Board"	520520	200200

It can be seen from Table 1 that the transverse fracture load strength and longitudinal fracture load strength of the phase-change gypsum board with temperature control performance prepared in the examples of the present application are greater than those of the gypsum board prepared in the comparative example, and higher than those of GB/T 9775-2008 Standard in "Gypsum Board".

The preparation of the test block of the embodiment and the comparative example is to mix and stir the plaster of paris with water at 15°C and 40°C respectively, and pour it into a grinding tool after uniformity to prepare a test block of 160*40*40mm; then dry it at 45°C for 24 hours; The results of the flexural and compressive strength of the test block are shown in Table 2 below;

温度temperature	名称name	抗折/MPaBending resistance/MPa	抗压/MPaCompression/MPa	抗折强度提升百分比percent increase in flexural strength	抗压强度提升百分比percent increase in compressive strength
实施例2Example 2	15℃15°C	9.29.2	26.1326.13	6.606.60	19.6419.64
对比例comparative example	40℃40℃	8.638.63	21.8421.84	//	//

As can be seen from Table 2, the phase-change gypsum board prepared by the examples of the present application has a flexural strength of 9.2/MPa and a compressive strength of 26.13/MPa; while the phase-change gypsum board prepared by the comparative example has a flexural strength of 8.63/MPa, The compressive strength is 21.84/MPa; the flexural and compressive properties of the phase-change gypsum board prepared in the examples of the present application are much better than those of the comparative examples.

Observe the electron microscope of the test block, as shown in Figure 1-2.

As can be seen from Figure 1, after baking for 24 hours, the face paper of the gypsum board prepared in the embodiment is the natural color, while the face paper prepared in the comparative example has been impregnated with oil, indicating that the phase change microcapsules used in the preparation method of the comparative example (not stored in an environment lower than the phase change temperature and the temperature of the water used is not lower than the phase change temperature) did not play the role of sealing the phase change material, the paraffin in the phase change microcapsules has leaked and migrated to the protective surface On the paper surface, there are hidden dangers of volatilization and affecting the quality of gypsum board.

As can be seen from Figure 2, the phase-change microcapsules of the embodiment still completely exist between the gypsum crystals, and the gypsum crystals have not changed substantially; while the phase-change microcapsules of the comparative example are damaged, and the gypsum crystals have also undergone large changes. changes, the crystals become shorter and trivial and lose strength.

It can be seen from Figure 3 that after gypsum boards are prepared with gypsum slurry at 15°C and 40°C, the crystal structure changes, and the high temperature makes the crystals grow and become larger, and the overlap between the crystals is loose; but the low temperature makes the crystals compact and elongated. Tightly cluster and increase crystal strength. See Figure 4 and Table 3 for the crystal strength change results.

The crystal strength change results are summarized in Table 3.

Table 3 Nanoindentation test results

样品名称sample name	E(GPa)E(GPa)	H(GPa)H(GPa)
LTLT	14.414±5.22514.414±5.225	0.205±0.1070.205±0.107
HTHT	3.619±0.8673.619±0.867	0.041±0.0180.041±0.018

The nano-indentation test can obtain the nano-mechanical properties of gypsum materials; as can be seen from Table 3, the nano-mechanical properties of gypsum hardened slurry prepared at low temperature are greatly improved compared with those at high temperature, Young's modulus, the average value of Young's modulus of low-temperature samples It is 14.41GPa, which is 4 times of 3.62GPa of high-temperature sample; the hardness of low-temperature sample is 0.205GPa, which is 5 times of 0.041GPa of high-temperature sample.

Although the embodiments disclosed in the present application are as above, the content described is only the embodiments adopted to facilitate understanding of the present application, and is not intended to limit the present application. Anyone skilled in the field of this application can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the protection scope of this application must still be The scope defined in the appended claims shall prevail.

Claims

A method for preparing a phase-change building material product with temperature-controlling performance, the preparation method comprising phase-change microcapsules before preparing the phase-change building material product with temperature-controlling performance and preparing phase-change microcapsules or phase-change microcapsules The capsule solution process is in an environment lower than the phase transition temperature, so that the phase transition material is in a solid state.
The preparation method according to claim 1, wherein, before preparing the phase change building material product with temperature control properties, the phase change microcapsules are placed in an environment lower than the phase change temperature for a period of time to ensure the phase change the material is in a solid state; and

Wherein the placement time is 5h to one month; the placement time can be 29 days to 10 days; the placement time can be 25 days to 9 days; the placement time can be 20 days to 8 days; the placement time can be It is 15 days to 8 days; the storage time can be 10 days to 5 days; the storage time can be 5 days to 1 day; the storage time can be 3 days to 23h; the storage time can be 2 days to 12h; and

The temperature of the environment lower than the phase transition temperature may be lower than the phase transition temperature by more than 5°C.
The preparation method according to claim 1, wherein the phase-change microcapsules are in solid powder form; or the phase-change microcapsules are in liquid form.
The preparation method according to claim 3, wherein,

When the phase-change microcapsules are solid powders, the phase-change microcapsules in the form of solid powder in an environment lower than the phase-transition temperature are mixed with water, so that the phase-change microcapsules in the form of solid powder are evenly distributed in the water , forming a phase change microcapsule solution; wherein the temperature of the water used in the phase change microcapsule solution is lower than the phase change temperature;

When the phase change microcapsules are in liquid form, the phase change microcapsules in liquid form are in an environment lower than the phase change temperature, so as to ensure that the phase change material in the phase change microcapsules is in a solid state; and

The temperature for storing the phase-change microcapsules, the water used for preparing the phase-change microcapsule solution, or storing the phase-change microcapsules in liquid form may be lower than the phase-change temperature by more than 5°C.
The preparation method according to claim 1, wherein the phase change microcapsules have an enthalpy retention rate of 60% to 99%, an enthalpy value of 50J/g to 200J/g, and an average particle size of 0.1 μm to 20 μm, The average particle diameter may be 0.1 μm to 10 μm, and the phase transition temperature may be 15° C. to 30° C.
The preparation method according to claim 1, wherein the solid content of the phase-change microcapsule solution is 20% to 60%, ensuring that the solution has better fluidity.
The preparation method according to any one of claims 1 to 6, wherein the phase-change microcapsules include a core material and a wall material; and wherein the core material and the wall material are any one of an inorganic substance and an organic substance one or two.
The preparation method according to claim 7, wherein the core material is any one or more of alcohol compounds, organic acid compounds, ester compounds and alkane compounds.
The preparation method according to claim 7, wherein the core material is any one or more of paraffin wax, capric acid, octanoic acid, butyl stearate, polyethylene glycol, lauryl alcohol or n-octane.
A phase-change building material product with temperature control properties prepared by the preparation method described in any one of claims 1 to 9, the phase-change building material product includes phase-change gypsum board, phase-change gypsum block, phase-change plaster Lime plaster, phase change self-leveling mortar, phase change gypsum batten and phase change concrete.
A phase-change gypsum board with temperature control performance prepared by the preparation method described in any one of claims 1 to 9, taking 100 parts by weight of plaster, phase-change microcapsules: binder: face-protecting paper : The weight ratio of water is (5 to 50): (0.1 to 1): (0.05 to 0.1): (55 to 95).
The phase-change gypsum board with temperature control performance according to claim 11, wherein, the phase-change gypsum board also includes a reinforcing agent, the phase-change microcapsule: the binder: the reinforcing agent: the Protective paper: the weight ratio of the water is (5 to 50): (0.1 to 1): (0.05 to 5): (0.05 to 0.1): (55 to 95).
The phase-change gypsum board with temperature control performance according to claim 12, wherein, the phase-change gypsum board also includes a water reducing agent, the phase-change microcapsule: the binder: the reinforcing agent: the The weight ratio of the water reducer: the face paper: the water is (5 to 50): (0.1 to 1): (0.05 to 5): (0.05 to 5): (0.05 to 0.1): (55 to 95).
The phase-change gypsum board with temperature control performance according to claim 13, wherein, the phase-change gypsum board also includes a surfactant, the phase-change microcapsule: the binder: the reinforcing agent: the The water reducer: the surfactant: the face paper: the weight ratio of the water is (5 to 50): (0.1 to 1): (0.05 to 5): (0.05 to 5): 0.05 to 5: 0.05 to 0.1: 55 to 95.
The phase-change gypsum board with temperature control performance according to claim 11, wherein the binder is any one or more of corn starch, modified corn starch, tapioca starch and pregelatinized starch.
The phase-change gypsum board with temperature control performance according to claim 12, wherein the reinforcing agent is any one or more of glass fibers, carbon fibers, wollastonite and gypsum whiskers.
The phase-change gypsum board with temperature control performance according to claim 13, wherein the water reducer is lignosulfonate-based water reducer, naphthalene-based high-efficiency water-reducer, melamine-based high-efficiency water-reducer Any one or more of superplasticizers, sulfamate-based superplasticizers, fatty acid-based superplasticizers, and polycarboxylate-based superplasticizers.
The phase-change gypsum board with temperature control performance according to claim 14, wherein the surfactant is sodium linear alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether sodium sulfate and fatty alcohol polyoxyethylene ether sulfuric acid Any one or more of ammonium.
The phase-change gypsum board with temperature control properties according to any one of claims 11 to 18, wherein the phase-change gypsum board is obtained by the following steps:

(1) Plaster of paris and binding agent; And optionally reinforcing agent are fully mixed to form a dry powder;

(2) preparing the phase-change microcapsules of solid powder as a phase-change microcapsule solution or preparing the phase-change microcapsules in liquid form as a phase-change microcapsule solution in a stand-by form;

(3) mixing an optional water reducing agent, an optional surfactant, and water to form a wet material;

(4) fully mixing the dry powder material, the phase change microcapsule solution and the wet material to form a slurry; and

(5) placing the slurry in the middle of the protective paper, cutting and drying to form a phase-change gypsum board with temperature control properties; and

Wherein, before preparing the phase change building material product with temperature control performance, the phase change microcapsules are placed in an environment lower than the phase change temperature for a period of time to ensure that the phase change material is in a solid state; and

Wherein the placement time is 5h to one month; the placement time can be 29 days to 10 days; the placement time can be 25 days to 9 days; the placement time can be 20 days to 8 days; the placement time can be It is 15 days to 8 days; the storage time can be 10 days to 5 days; the storage time can be 5 days to 1 day; the storage time can be 3 days to 23h; the storage time can be 2 days to 12h; and

The temperature of the environment lower than the phase transition temperature may be more than 5°C lower than the phase transition temperature; and

A binder and optionally a reinforcing agent may not be mixed into the plaster of paris in step (1); the binder and optionally a reinforcing agent are mixed in step (3).