CN113501701A

CN113501701A - Gypsum board and preparation method thereof

Info

Publication number: CN113501701A
Application number: CN202110713381.8A
Authority: CN
Inventors: 王丽; 杨正波; 陈红霞; 冉秀云
Original assignee: China National Building Materials Innovation and Technology Research Institute Co Ltd
Current assignee: China National Building Materials Innovation and Technology Research Institute Co Ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2021-10-15
Anticipated expiration: 2041-06-25
Also published as: CN113501701B; WO2022267305A1

Abstract

The application provides a gypsum board, which consists of a board core and a protective film, wherein the raw materials of the board core comprise gypsum clinker, expanded vermiculite and silica fume; the protective film comprises one or more of polyethylene oxide, acrylic emulsion, epoxy resin, starch, dispersible latex powder and ultraviolet curing resin, an independent self-assembly flexible vermiculite nano film and silica sol. The application provides a gypsum board with good flame-retardant, fireproof, heat-preservation and sound-insulation properties.

Description

Gypsum board and preparation method thereof

Technical Field

The present invention relates to, but is not limited to, building material technology, and more particularly, but not exclusively, to gypsum board and a method of making the same.

Background

As is well known, gypsum is a porous building material, and gypsum board has excellent properties of light weight, fire resistance, flame retardance and the like, and is a common building decoration material and an indoor partition board. However, the conventional paper-surface gypsum board (9.5mm and 12mm) has certain limitations on fire resistance, heat insulation performance and sound insulation performance. Especially in fire or extreme conditions, the fire retardant property of the gypsum board can be prolonged, so that the life and property loss can be effectively saved. The heat preservation performance of the gypsum board is improved in the northern area with cold weather, and the gypsum board has important significance for saving energy and improving the comfort of human living environment.

In the current place with higher requirements on sound, in the prior art, the sound-absorbing perforated gypsum board with large noise reduction coefficient (a paper-surface gypsum board which is suitable for indoor sound absorption and is provided with holes penetrating through the front and back surfaces of the gypsum board) and a suspended ceiling structure are generally used for reducing noise and improving tone quality by designing the thickness, the aperture, the perforation rate, the back covering material, the sound-absorbing material and the depth of a cavity. But the perforated gypsum board and the suspended ceiling structure are complex in preparation process and have high requirements on the gypsum board substrate. The perforated gypsum board requires that the strength of a gypsum substrate is good, but the mechanical strength of the substrate is reduced to a certain extent due to the doping of a phase-change material, and when the perforated gypsum board is prepared by adopting the phase-change gypsum board, the phase-change material in the board core is exposed and leaked by a perforation process, so that the leakage of the phase-change material is easily caused.

Disclosure of Invention

The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.

The application solves the problems through a new process, and prepares the functional gypsum board with good performance. The thickness of the gypsum board substrate is 9.5mm to 12 mm.

The application provides a gypsum board, which consists of a board core and a mask, wherein the mask comprises any one or more of polyethylene oxide, acrylic emulsion, epoxy resin, starch, dispersible latex powder and ultraviolet curing resin, an independent self-assembled flexible vermiculite nano-film and silica sol.

In one embodiment provided herein, the gypsum can have a particle size of 80-100 mesh. The granularity of the gypsum is within the range, and the gypsum-based board with better performance can be obtained.

In one embodiment, the surface density of the independent self-assembled flexible vermiculite nano film is 5 x 10^-4g/cm²To 10X 10^-4g/cm²(ii) a Optionally, the preferred areal density is 7.96 × 10^-4g/cm²To 4.78X 10^-3g/cm²；

In one embodiment, the preparation method of the mask film comprises the following steps:

1) uniformly mixing the expanded vermiculite with supersaturated brine to obtain a mixture 1;

2) heating the mixture 1 to more than 100 ℃, and then cooling to less than 0 ℃ until the particle size d50 of the expanded vermiculite is less than or equal to 0.45 mu m; optionally, the warming and cooling cycles are more than two times;

3) filtering the mixture 1 treated in the step 2) by using filter paper, taking filtrate, performing suction filtration by using a microporous filter membrane, and drying to obtain the independent self-assembled flexible vermiculite nano-film.

In one embodiment provided herein, in step 1), the ratio of the amount of expanded vermiculite to the amount of supersaturated brine is 2g to 50g of expanded vermiculite per liter of supersaturated brine; the salt is an alkali metal salt; preferably, the alkali metal salt comprises a sodium salt or a lithium salt;

in one embodiment provided by the present application, in step 2), the temperature of the temperature rise is 100 ℃ to 200 ℃, and the heating time is 4h to 12 h; optionally, the temperature of the temperature reduction is 0 ℃ to-30 ℃;

in one embodiment provided herein, in step 3), the pore size of the microporous filtration membrane is 0.22 μm to 0.45 μm.

In another aspect, the present application provides a method for preparing the gypsum board, comprising:

1) uniformly coating any one or more of acrylic emulsion, polyethylene oxide, epoxy resin, gelatinized starch, dispersible latex powder and ultraviolet curing resin between the outer surface of the core of the gypsum board and the independent self-assembled flexible vermiculite nano film; bonding and compacting the independent self-assembled flexible vermiculite nano film and the gypsum board core;

2) and after the independent self-assembly flexible vermiculite nano film is dried, coating silica sol, and drying to obtain the gypsum board.

In one embodiment, one or more of the polyacrylic emulsion, the polyethylene oxide, the epoxy resin, the starch, the dispersible latex powder and the ultraviolet curable resin are used in an amount of 50g/m in the gypsum board substrate²To 1000g/m²Preferably, the amount is 300g/m²To 1000g/m²；

In one embodiment provided by the application, polyacrylic emulsion and polyethylene oxide are uniformly coated between the outer surface of the gypsum board core and the independent self-assembled flexible vermiculite nano-film; the weight ratio of the polyacrylic acid emulsion to the polyethylene oxide is (5 to 15): (0.01 to 0.5);

in one embodiment, the silica sol has a thickness of 100nm to 500 μm.

In one embodiment provided herein, the core material of the gypsum board includes: gypsum clinker, expanded vermiculite, silica fume, phase change material, heat conduction reinforcing material, reinforcing fiber and polyvinyl alcohol;

the phase change material and the heat conduction reinforcing material are positioned in the interlayer space of the expanded vermiculite;

in one embodiment provided herein, the board core raw material further comprises one or more of a foaming agent and a water reducing agent;

in one embodiment, the weight ratio of the gypsum clinker, the thermal conductivity enhancing material, the reinforcing fiber, the expanded vermiculite, the silica fume, the phase change material, the polyvinyl alcohol, the water reducing agent and the foaming agent is (90 to 100): 0.01 to 4): 0.1 to 4): 0.5 to 7): 0.5 to 6): 1 to 15): 0.3 to 3: (0 to 0.3): 0 to 0.05;

in one embodiment provided herein, preferably, the weight ratio of the gypsum clinker, the thermal conductivity enhancing material, the reinforcing fiber, the expanded vermiculite, the silica fume, the phase change material, the polyvinyl alcohol, the water reducing agent and the foaming agent is (90 to 100): (0.01 to 4): (0.1 to 4): (0.5 to 5): (1 to 15): (0.3 to 3): (0.01 to 0.3): (0.01 to 0.05).

In one embodiment provided herein, the exfoliated vermiculite is 60 mesh screen exfoliated vermiculite;

in one embodiment provided herein, the expanded vermiculite has a pore size distribution of from 0.01 μm to 50 μm;

in one embodiment provided herein, the thermal conductivity enhancing material is selected from any one or more of carbon network, silicon carbide nanowire, metal nanowire, carbon nanotube and graphene;

in one embodiment, the average length of the thermal conductivity enhancement material is 10 μm to 100 μm; the average diameter of the heat conduction reinforcing material is 0.1nm to 1000nm, the preferred average length is 10 mu m to 50 mu m, the preferred average diameter is 100nm to 600nm, and the heat conduction reinforcing material is a silicon carbide heat conduction reinforcing material;

in one embodiment provided herein, the gypsum clinker has an average particle size of 80 mesh to 100 mesh;

in one embodiment, the melting point of the phase change material is 20 ℃ to 50 ℃;

in one embodiment provided herein, the phase change material is selected from any one or more of emulsified paraffin, polyethylene glycol, and lauric acid; preferably, the melting point of the polyethylene glycol is 30 ℃ to 50 ℃, and the molecular weight is not more than 2000; optionally, the paraffin wax has a melting point of 20 ℃ to 41 ℃.

In one embodiment provided herein, the reinforcing fibers are selected from any one or more of carbon fibers, pitch-based carbon fibers, polypropylene fibers, glass fibers, graphene carbon fibers, and gypsum whiskers;

in one embodiment provided herein, the reinforcing fibers have an average length of 1mm to 10mm and an average diameter of 5 μm to 10 μm; more preferably, the reinforcing fibers have an average length of 1mm to 5mm and an average diameter of 5 μm to 10 μm, and the reinforcing fibers are carbon fibers.

In one embodiment provided herein, the polyvinyl alcohol is selected from the group consisting of polyvinyl alcohol PVA2488, polyvinyl alcohol PVA 1788;

in one embodiment provided herein, the foaming agent is an anionic surfactant; preferably, the anionic surfactant is selected from basf

GYP 3550、

GYP 2680、

SASN 812 or 3110 or sodium lauryl sulfate;

in one embodiment provided herein, the water reducing agent is selected from one or more of polycarboxylic acid-based water reducing agents, melamine resins, sulfonated condensation polymer (sulfonated melamine-based) water reducing agents;

in one embodiment provided herein, the starch is a pregelatinized starch having a viscosity in a range of: 50 to 100 mPas (1# rotor).

In another aspect, the present application provides a method for preparing a gypsum board based on the above board core, further comprising the following steps:

a) dispersing the reinforced fibers in water, and adding the polyvinyl alcohol to obtain a mixture a;

b) uniformly mixing the expanded vermiculite with the mixture a and the foaming agent to obtain a mixture b;

c) and (b) uniformly mixing the gypsum clinker, the silica fume, the water reducing agent and the mixture b to obtain gypsum slurry, and drying the gypsum slurry to obtain the gypsum board core.

In an embodiment provided by the present application, in step a, the amount of water is the amount of water used for the standard consistency of the gypsum clinker, the silica fume, the expanded vermiculite, the polyvinyl alcohol, the water reducing agent and the powder after the reinforcing fibers are uniformly mixed.

In one embodiment, the exfoliated vermiculite is treated as follows:

I) uniformly mixing the expanded vermiculite with supersaturated salt water to obtain a mixture c;

II) heating the mixture c to above 100 ℃, and then cooling to below 0 ℃ until the particle size d50 of the expanded vermiculite is less than or equal to 0.45 mu m; optionally, the warming and cooling cycles are more than two times;

III) filtering the mixture c treated in the step II) by using filter paper, washing by using deionized water, drying the obtained solid to obtain treated expanded vermiculite, uniformly mixing the heat conduction reinforcing material, the phase change material and the treated expanded vermiculite, and standing for 1d to 3d at room temperature to obtain a mixture d;

IV) storing the mixture d for 5min to 40min under the conditions of constant temperature and constant pressure;

v) separating the mixture d treated in step IV) to obtain treated expanded vermiculite;

optionally, the ratio of the amount of expanded vermiculite to the supersaturated brine in step I is from 2g to 50g of expanded vermiculite per litre of supersaturated brine; the salt is an alkali metal salt; preferably, the alkali metal salt comprises a sodium salt or a lithium salt;

in one embodiment provided by the present application, the temperature of the temperature rise in step II is 100-; optionally, the temperature of the temperature reduction is 0 ℃ to-30 ℃;

in one embodiment provided herein, in step IV, optionally, the constant temperature is 35 ℃ to 45 ℃ and the constant pressure is-0.09 MPa to 0.01 MPa.

The application widens the application range and functions of the gypsum board. The concrete advantages are as follows:

1. the phase-change material in the gypsum base material is effectively prevented from leaking, the high-temperature resistance of the gypsum board is improved, and the gypsum board is flame-retardant and excellent in heat-insulating property;

2. the waterproof effect is good;

3. the plate has an antibacterial function;

4. the gypsum board has good heat insulation performance, realizes a sound insulation function on the premise of not increasing the thickness and the perforation rate of the gypsum board, can replace a perforated paper-surface gypsum board, constructs an ideal sound absorption ceiling structure, can adjust reverberation time, improve indoor tone quality and reduce noise, and can be applied to places with higher requirements on sound, such as movie theaters, music halls, report halls, meeting rooms, multifunctional halls and the like.

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 the practice of the application. Other advantages of the present application may be realized and attained by the invention in its aspects as described in the specification.

Drawings

The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.

FIG. 1 is a self-assembled flexible vermiculite nano-film prepared in example 1 of the present application;

FIG. 2 is a Scanning Electron Microscope (SEM) image of a freestanding, self-assembled flexible vermiculite nano-film prepared in example 1 of the present application;

FIG. 3 is a Scanning Electron Microscope (SEM) image of a self-assembled flexible vermiculite nanofilm by a common process;

FIGS. 4A, 4B and 4C are Scanning Electron Microscope (SEM) images of the expanded vermiculite flakes prepared in example 1 of the present application, from which it can be seen that the pore size distribution of the treated expanded vermiculite is about 0.01 μm to 50 μm.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Example 1

In this example, the water reducing agent was a polycarboxylic acid water reducing agent, available from basf corporation,

pce541f.f; polyvinyl alcohol was purchased from clony international trade, shanghai ltd, PVA 2488; the foaming agent is purchased from Pasteur Limited company, is an anionic surfactant,

GYP 2680. The silica fume is purchased from the Angn China company, 200 plus 1000 meshes; the reinforced fiber is carbon fiber, the average length is 3mm, and the average diameter is 7 μm; the phase-change material is emulsified paraffin, and the phase-change temperature is 20-41 ℃; the average length of the silicon carbide nanowire heat conduction reinforcing material is 10-50 mu m, and the average diameter is 100-600 nm; the expanded vermiculite is from Hubei Lingshou county;

the treatment method of the expanded vermiculite comprises the following steps:

(1) crushing vermiculite to prepare expanded vermiculite with high expansion rate (screening by a 60-mesh sieve), cleaning the expanded vermiculite with deionized water, and mixing with NaCl supersaturated solution (the weight of the vermiculite is 20g/L) to obtain a mixed solution of the expanded vermiculite and water;

(2) placing the mixed solution of the expanded vermiculite and the water prepared in the step (1) on an electric heater (160 ℃), heating while stirring (periodically supplementing deionized water), cooling to room temperature after 8 hours, then gradually cooling to-10 ℃, optionally placing on an electric heating plate again after 8 hours, and repeatedly circulating for many times until the particle size d50 of the expanded vermiculite is less than or equal to 0.45 um;

(3) filtering the vermiculite mixture prepared in the step (2) by using filter paper, and washing the vermiculite by using deionized water;

(4) the vermiculite on the filter paper is placed in an oven to dry until ready for use, at which time the expanded vermiculite has a pore size distribution of about 0.01 μm to 50 μm. Taking the filtered filtrate for later use.

The following is the gypsum board manufacturing process:

uniformly dispersing 1g of the silicon carbide nanowire heat conduction reinforcing material in 20g of emulsified paraffin (the phase change melting point is 20-41 ℃), then fully and uniformly mixing 20g of expanded vermiculite nanosheets (vermiculite on the filter paper dried in the step (4)) with the emulsified paraffin, standing for 1d at room temperature, and then maintaining for 20 minutes under the conditions of constant temperature (the temperature is 40 +/-2 ℃) and constant pressure (the vacuum degree is-0.09 MPa-0.01 MPa); under the action of capillary force and surface tension, the emulsified paraffin is immersed into the pores of the expanded vermiculite. The expanded vermiculite was then transferred to filter paper and the surface of the expanded vermiculite was freed from the seeping emulsified paraffin in a drying oven above the melting point of the phase change material (60 ℃). The filter paper was continuously replaced until no evidence of leakage was observed.

And weighing mixing water according to the water consumption of the standard consistency (the water consumption of the standard consistency is tested by uniformly mixing 1000g of desulfurized gypsum clinker, 10g of silica fume, 20g of expanded vermiculite nanosheet phase change material, 1g of polyvinyl alcohol, 0.5g of water reducing agent and 3g of carbon fiber). Adding 3g of carbon fiber into the mixing water, uniformly dispersing, adding 1g of polyvinyl alcohol, and uniformly stirring; and then pouring the prepared expanded vermiculite nano sheet into the mixed solution, and uniformly stirring. Then, 0.2g of the blowing agent was added. Finally, pouring 1000g of desulfurized gypsum clinker (sieved by a sieve of 80 meshes), 10g of silica fume and 0.5g of water reducing agent into the solution, uniformly stirring, preparing gypsum slurry, and forming in a mold to form a gypsum board core;

the preparation method of the independent self-assembly flexible vermiculite nano film comprises the following steps: and (3) carrying out suction filtration on the filtrate with certain volume and concentration obtained in the step (4) in the process of preparing the expanded vermiculite by using a water-based microporous filter membrane (0.45 mu m). And after filtering, reserving the filter cake after suction filtration in a filtering device for natural drying to form the independent self-assembled flexible vermiculite nano-film. And then separating the dried independent self-assembled flexible vermiculite nano-film from the filter membrane.

Mixing 10g of polyacrylic acid emulsion and 0.01g of polyoxyethylene uniformly; uniformly coated on the outer surface of the gypsum board substrate (the area of the coated gypsum board substrate is 0.12 m)²) (ii) a Independent self-assembled flexible vermiculite nano film (4 multiplied by 10)^-3g/cm²) Free surface (the surface of the nano-film clinging to the water system filter membrane)Is a non-free surface, and the surface of the nano film exposed in the air is a free surface) is coated on the gypsum board substrate in a close contact manner;

and after the independent self-assembly flexible vermiculite nano film is completely dried, coating a layer of silica sol (10g) on the independent self-assembly flexible vermiculite nano film to ensure that the thickness of the silica sol is 0.1mm, and drying to obtain the gypsum board.

As can be seen by comparing fig. 2 and fig. 3, the vermiculite nano-film in fig. 2 has high flatness and density, and can effectively prevent the organic phase change material with a large molecular weight from seeping.

Example 2

The difference from the embodiment 1 is that the phase change material encapsulated in the expanded vermiculite nano-sheet is polyethylene glycol, the melting point of the polyethylene glycol is 30-50 ℃, and the molecular weight is not more than 2000; the amount of polyethylene glycol used was the same as the amount of phase change material used in example 1.

Example 3

The difference from example 1 is that the amount of silica fume added in the formulation was 20 g.

Example 4

The difference from example 1 is that the amount of carbon fibers added in the formulation is 1 g.

Example 5

The difference from example 1 is that the amount of exfoliated vermiculite added in the formulation is different. In the process of preparing the gypsum board, the addition amount of the expanded vermiculite nano-sheet is 10 g.

Comparative example 1

The difference between the comparative example and the example 1 is that the raw material of the gypsum board does not contain expanded vermiculite phase-change materials (specifically, expanded vermiculite, emulsified paraffin and silicon carbide nanowire heat conduction reinforcing materials which are left on filter paper after the expanded vermiculite is treated in the step (4) of the example 1).

Comparative example 2

This comparative example differs from example 1 in that emulsified paraffin and silicon carbide nanowire thermal conductivity enhancing materials are not involved.

Comparative example 3

This comparative example differs from example 1 in that no silicon carbide nanowire thermal conductivity enhancing material is involved.

Comparative example 4

This comparative example differs from example 1 in that no emulsified paraffin is involved.

Comparative example 5

This comparative example differs from example 1 in that, instead of expanded vermiculite, silicon carbide nanowires and emulsified paraffin are added during the process of making gypsum board.

Comparative example 6

The difference from the example 1 is that the protective film is not used, starch (which is used in the conventional amount in the field) is uniformly mixed with each raw material when gypsum slurry is prepared, and the gypsum board substrate is lapped with the protective paper and is firmly adhered to the protective paper when the gypsum board substrate is a wet board. The starch is pre-gelatinized starch, and the viscosity of the starch is 55mPa & s (1# rotor);

performance testing

1. And (3) testing the fracture load of the plate: the gypsum boards prepared in the examples and comparative examples were tested for breaking load according to the method of the chinese national standard GB/T9775-2008, and the results are shown in table 1.

TABLE 1 mechanical Properties of the products obtained in the examples and comparative examples

2. And (3) testing the fire resistance stability: the gypsum boards prepared in the examples and comparative examples were tested for fire stability according to the method of the Chinese national Standard GB/T9775-2008 "Gypsum plasterboard", and the results are shown in Table 2.

Table 2 fire stability of the plasterboards prepared in the examples and comparative examples

3. The gypsum boards prepared in the embodiment and the comparative example can effectively reduce indoor noise and make indoor environment quieter by installing the gypsum boards prepared in the embodiment 1 in the same room. The paper-faced gypsum boards of comparative examples 1, 5 and 6 have poor noise reduction effect.

4. The gypsum board prepared by the embodiment of the application has no condition of leakage of the phase-change material; meanwhile, the effects of comparative example 1, comparative example 2 and comparative example 4 to reduce the fluctuation of the indoor temperature (the effect to reduce the fluctuation of the indoor temperature compared to the examples) were weak (according to the test methods which are conventional in the art).

Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims

1. A gypsum board comprises a board core and a protective film,

the protective film comprises any one or more of polyethylene oxide, acrylic emulsion, epoxy resin, starch, dispersible latex powder and ultraviolet curing resin, and is independently self-assembled with a flexible vermiculite nano-film and silica sol.

2. The gypsum board of claim 1 wherein the free-standing self-assembled flexible vermiculite nano-film has an areal density of 5 x 10^-4g/cm²To 10X 10^-3g/cm²(ii) a Optionally, the areal density is 7.96 × 10^-4g/cm²To 4.78X 10^-3g/cm²。

3. The gypsum board of claim 1 wherein the method of making the cover film comprises the steps of:

1) uniformly mixing expanded vermiculite with supersaturated salt water to obtain a mixture 1;

2) heating the mixture 1 to more than 100 ℃, and then cooling to less than 0 ℃ until the particle size d50 of the expanded vermiculite is less than or equal to 0.45 mu m; optionally, the heating and cooling cycles are more than two times;

4. The gypsum board of claim 3 wherein in step 1), the ratio of the amount of exfoliated vermiculite to the amount of supersaturated brine is from 2 to 50g of exfoliated vermiculite per litre of supersaturated brine; the salt is an alkali metal salt; preferably, the alkali metal salt comprises a sodium salt or a lithium salt;

optionally, in the step 2), the heating temperature is 100 ℃ to 200 ℃, and the heating time is 4h to 12 h; optionally, the temperature of the temperature reduction is 0 ℃ to-30 ℃;

optionally, in step 3), the pore size of the microporous filter membrane is 0.22 μm to 0.45 μm.

5. The gypsum board of claim 3 or 4, wherein the gypsum board is prepared by a process comprising:

1) uniformly coating any one or more of polyacrylic acid emulsion, polyethylene oxide, epoxy resin, starch, dispersible latex powder and ultraviolet curing resin between the outer surface of the core of the gypsum board and the independent self-assembled flexible vermiculite nano film; bonding the independent self-assembled flexible vermiculite nano-film with the gypsum board core;

6. The gypsum board of claim 5, wherein any one or more of the polyacrylic acid emulsion, the polyethylene oxide, the epoxy resin, the starch, the dispersible latex powder, and the ultraviolet curable resin is present in the gypsum board substrate in an amount of 50g/m²To 1000g/m²Preferably, the amount is 300g/m²To 1000g/m²；

Optionally, polyacrylic acid emulsion and polyethylene oxide are uniformly coated between the outer surface of the gypsum board core and the independent self-assembly flexible vermiculite nano-film; the weight ratio of the polyacrylic acid emulsion to the polyethylene oxide is (5 to 15): (0.01 to 0.5);

optionally, the silica sol has a thickness of 100nm to 500 μm.

7. The gypsum board of claim 5 wherein the core stock of the gypsum board comprises: gypsum clinker, expanded vermiculite, silica fume, phase change material, heat conduction reinforcing material, reinforcing fiber and polyvinyl alcohol;

optionally, the core raw material further comprises one or more of a foaming agent and a water reducing agent;

optionally, the weight ratio of the gypsum clinker, the thermal conductivity enhancing material, the reinforcing fibers, the expanded vermiculite, the silica fume, the phase change material, the polyvinyl alcohol, the water reducing agent, the foaming agent is (90 to 100): 0.01 to 4): 0.1 to 4): 0.5 to 7): 0.5 to 6): 1 to 15): 0.3 to 3): 0 to 0.3): 0 to 0.05;

preferably, the weight ratio of the gypsum clinker, the thermal conductivity enhancing material, the reinforcing fiber, the expanded vermiculite, the silica fume, the phase change material, the polyvinyl alcohol, the water reducing agent and the foaming agent is (90 to 100): 0.01 to 4): 0.1 to 3): 0.5 to 5): 1 to 15): 0.3 to 3: (0.01 to 0.3): 0.01 to 0.05.

8. The gypsum board of claim 7 wherein the exfoliated vermiculite is 60 mesh screen exfoliated vermiculite;

optionally, the expanded vermiculite has a pore size distribution of from 0.01 μm to 50 μm;

optionally, the thermal conductivity enhancing material is selected from any one or more of carbon network, silicon carbide nanowire, metal nanowire, carbon nanotube and graphene;

optionally, the average length of the thermal conductivity enhancing material is 10 μm to 100 μm; the average diameter of the heat conduction reinforcing material is 0.1nm to 1000nm, the preferred average length is 10 mu m to 50 mu m, the preferred average diameter is 100nm to 600nm, and the heat conduction reinforcing material is a silicon carbide heat conduction reinforcing material;

optionally, the gypsum clinker has an average particle size of 80 mesh to 100 mesh;

optionally, the phase change material has a melting point of 20 ℃ to 50 ℃;

optionally, the phase change material is selected from any one or more of emulsified paraffin, polyethylene glycol and lauric acid; preferably, the melting point of the polyethylene glycol is 30 ℃ to 50 ℃, and the molecular weight is not more than 2000; optionally, the paraffin wax has a melting point of 20 ℃ to 41 ℃;

optionally, the reinforcing fibers are selected from any one or more of carbon fibers, pitch-based carbon fibers, polypropylene fibers, glass fibers, graphene carbon fibers, and gypsum whiskers;

preferably, the reinforcing fibers have an average length of 1mm to 10mm and an average diameter of 5 μm to 10 μm; more preferably, the reinforcing fibers have an average length of 1mm to 5mm and an average diameter of 5 μm to 10 μm, and the reinforcing fibers are carbon fibers;

optionally, the polyvinyl alcohol is selected from polyvinyl alcohol PVA2488, polyvinyl alcohol PVA 1788;

optionally, the foaming agent is an anionic surfactant; preferably, the anionic surfactant is selected from basf

GYP 3550、

GYP 2680、

SASN 812 or 3110 or sodium lauryl sulfate;

optionally, the water reducing agent is selected from one or more of polycarboxylic acid based water reducing agents, melamine resins, sulphonated polycondensate water reducing agents.

9. The gypsum board of any one of claims 7 to 8, the method of making the gypsum board further comprising the steps of:

c) uniformly mixing the gypsum clinker, the silica fume, the water reducing agent and the mixture b to obtain gypsum slurry, and drying the gypsum slurry to obtain a gypsum board core;

optionally, in the step a, the amount of water is the amount of water used for the standard consistency of the powder formed by uniformly mixing the gypsum clinker, the silica fume, the expanded vermiculite, the polyvinyl alcohol and the water reducing agent.

10. The gypsum board of claim 8 wherein the exfoliated vermiculite is treated as follows:

optionally, the temperature rise in the step II is 100-200 ℃, and the temperature rise time is 4-12 h; optionally, the temperature of the temperature reduction is 0 ℃ to-30 ℃;

optionally, in step IV, the constant temperature is 35 ℃ to 45 ℃ and the constant pressure is-0.09 MPa to 0.01 MPa.