Preparation method and construction process of gypsum-based integrated wallboard

Abstract

The invention discloses a preparation method and a construction process of a gypsum-based integrated wallboard. The preparation method comprises the following steps: uniformly mixing calcined gypsum powder, glass fibers, wood fibers, corn starch and a coagulant, and feeding the mixture into a stirrer; the emulsion and water are diluted in advance according to the ratio of 1: 1 and stirred evenly, the foaming agent foams in advance, and then the emulsion, the water reducing agent and clear water enter a stirrer to form slurry; the lower surface protecting paper moves forwards along with the forming belt, and patterns are continuously sprayed on line through UV spraying equipment; and then wet plate forming is carried out on the upper surface protection paper and the upper surface protection paper through an extrusion forming machine. By increasing the adding amount of the glass fibers and adding the wood fibers and the vinyl acetate homopolymer emulsion, reinforcing and toughening are achieved, the gypsum board is not prone to cracking and can be connected in a clamped mode, UV spraying is conducted on the floral patterns, conversion of the gypsum board from a base material to a plane material is achieved, the requirements of market customers are met, and conversion of the gypsum board from the base material to the plane material is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wallboard preparation, and in particular to a preparation method of a gypsum-based integrated wallboard and a construction process thereof. Background Art

[0002] Gypsum board is popular among users for its lightness, easy processing, environmental protection and low price. Gypsum board has gradually become the preferred material for interior decoration, but the gypsum board on the market can only be used as a base material, and after installation, putty needs to be scraped to fill the joints and level it.

[0003] The current gypsum boards are not strong enough and tough enough, so they are prone to cracking after a long time, which makes it impossible for the gypsum boards to be interlocked and connected with each other. Therefore, they can only be used as base materials and are difficult to use as surface materials. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation method of a gypsum-based integrated wallboard and a construction process thereof, so as to solve the technical problem in the prior art that gypsum boards are difficult to use as surface materials due to insufficient strength and toughness.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] In a first aspect, the present invention provides a method for preparing a gypsum-based integrated wallboard, comprising the following steps:

[0007] The gypsum powder, glass fiber, wood fiber, corn starch and coagulant are respectively conveyed into the mixing reamer after metering, and then mixed evenly and then enter the mixer;

[0008] Dilute the emulsion with water in a 1:1 ratio and mix well before metering and conveying into the mixer;

[0009] The water reducing agent is metered and transported into the mixer;

[0010] After the foaming agent and water are evenly mixed, they enter the foaming equipment together with the compressed air to form uniform foam that enters the mixer;

[0011] Clean water is delivered into the mixer by metering;

[0012] Stir the above dry and wet materials into a uniform slurry;

[0013] The lower face paper moves forward along with the forming belt, passes through the UV spraying equipment, and is continuously sprayed with patterns online;

[0014] After UV spraying, the lower face paper moves to the forming table, and the slurry is continuously poured on the lower face paper passing through the forming table, and the upper face paper that is continuously pulled out passes through the extrusion molding machine to form a wet board;

[0015] The wet board solidifies on the forming belt and is cut, dried, sawed, edge-sealed and packaged to prepare the finished gypsum board.

[0016] Furthermore, the raw materials of the gypsum board slurry include, by weight: 100 parts of gypsum powder, 65-80 parts of water, 2-4 parts of wood fiber, 2.5-5 parts of emulsion, 0.8-1 part of glass fiber, 0.3-0.6 parts of water reducer, 0.2-0.4 parts of starch, 0.1-0.3 parts of coagulant, and 0.01-0.02 parts of foaming agent.

[0017] Further, the preparation method of gypsum powder is:

[0018] After calcination, the desulfurized gypsum removes all attached water and part of the crystal water to generate building gypsum powder with hemihydrate gypsum as the main component, which is then ground and aged to obtain gypsum powder;

[0019] Among them, the calcium sulfate dihydrate content of the desulfurized gypsum is greater than 90%, and the chloride ion content of the desulfurized gypsum is less than 300ppm;

[0020] The crystal water content of the gypsum powder is 5.0-5.5%, the loose bulk density of the gypsum powder is 800-850g / L, and the temperature of the gypsum powder after aging is 45-60°C.

[0021] Furthermore, when the foaming agent is foaming, the ratio of water to the foaming agent is 100:0.3-0.8, and the pressure of the compressed air is 0.20-0.25 MPa.

[0022] Furthermore, the monofilament diameter of the glass fiber is 10-15 μm, and the length of the glass fiber is 9-15 mm;

[0023] The fiber content of the wood fiber is 97-99%, and the length of the wood fiber is 450-550 μm.

[0024] Furthermore, the coagulant is gypsum powder, the specific surface area of ​​the gypsum powder is 12000-15000cm2 / g, and the moisture content of the gypsum powder is less than 1.5%;

[0025] The emulsion is a vinyl acetate homopolymer, and the solid content of the emulsion is 45-55%.

[0026] Furthermore, the corn starch is modified corn starch, and the preparation method of the modified corn starch is:

[0027] Disperse starch in water and adjust the temperature to 30-40°C and pH to 5-6;

[0028] adding an oxidant solution to carry out an oxidation reaction;

[0029] Neutralize the remaining oxidant with lye and wash several times with water;

[0030] The oxidized starch is dried to obtain modified corn starch.

[0031] Further, adjusting the pH value of the starch dispersion with acetic acid;

[0032] The oxidant is hydrogen peroxide;

[0033] The alkali solution used for neutralization is sodium hydroxide solution.

[0034] Furthermore, the method further comprises: drying the modified starch and then performing a micronization process on the starch using a ball mill;

[0035] The large particles are removed by sieving to ensure the uniformity of starch particles and obtain modified corn starch.

[0036] In a second aspect, the present invention provides a construction process for a gypsum-based integrated wallboard, wherein the gypsum-based integrated wallboard prepared by the above-mentioned preparation method comprises the following steps:

[0037] Open joint grooves for integrated wall panels;

[0038] Paste gypsum on the wall surface, and then paste the slotted integrated wall panels through the gypsum, and splice adjacent integrated wall panels through the splicing grooves;

[0039] The joints between adjacent integrated wall panels are covered with edge banding strips.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention increases the amount of glass fiber added, and adds wood fiber and vinyl acetate homopolymer emulsion to strengthen and toughen the gypsum board, so that the gypsum board is not easy to crack and can be connected with each other. The gypsum-based integrated wallboard with a thickness of 12 mm prepared by the above method has a transverse breaking load of more than 500N, a longitudinal breaking load of more than 1000N, a shear force of more than 1000N, and a UV spraying pattern to achieve the transformation of the gypsum board from a base material to a surface material, meet the needs of market customers, make the construction more convenient and quick, and meet the construction requirements of prefabricated buildings. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] The present invention provides a method for preparing a gypsum-based integrated wallboard, comprising the following steps:

[0044] The gypsum powder, glass fiber, wood fiber, corn starch and coagulant are respectively conveyed into the mixing reamer after metering, and then mixed evenly and then enter the mixer;

[0045] Dilute the emulsion with water in a 1:1 ratio and mix well before metering and conveying into the mixer;

[0046] The water reducing agent is metered and transported into the mixer;

[0047] After the foaming agent and water are evenly mixed, they enter the foaming equipment together with the compressed air to form uniform foam that enters the mixer;

[0048] Clean water is delivered into the mixer by metering;

[0049] Stir the above dry and wet materials into a uniform slurry;

[0050] The lower face paper moves forward along with the forming belt, passes through the UV spraying equipment, and is continuously sprayed with patterns online;

[0051] After UV spraying, the lower face paper moves to the forming table, and the slurry is continuously poured on the lower face paper passing through the forming table, and the upper face paper that is continuously pulled out passes through the extrusion molding machine to form a wet board;

[0052] The wet board solidifies on the forming belt and is cut, dried, sawed, edge-sealed and packaged to prepare the finished gypsum board.

[0053] The raw materials of gypsum board slurry include, by weight: 100 parts of gypsum powder, 65-80 parts of water, 2-4 parts of wood fiber, 2.5-5 parts of emulsion, 0.8-1 parts of glass fiber, 0.3-0.6 parts of water reducing agent, 0.2-0.4 parts of starch, 0.1-0.3 parts of coagulant, and 0.01-0.02 parts of foaming agent. The water reducing agent is a polycarboxylic acid water reducing agent.

[0054] The upper and lower protective papers are both 190 grams.

[0055] The current gypsum board is prone to cracking after a long time due to its insufficient strength and toughness, which makes it impossible for the gypsum boards to be interlocked with each other. Therefore, it can only be used as a base material and is difficult to use as a surface material. Therefore, it is necessary to develop a gypsum board that can be used as a surface material.

[0056] The present application increases the amount of glass fiber added, and adds wood fiber and vinyl acetate homopolymer emulsion to enhance and toughen the gypsum board, so that it is not easy to crack and can be connected to each other. The 12mm thick gypsum-based integrated wallboard prepared by the above method has a transverse breaking load of more than 500N, a longitudinal breaking load of more than 1000N, a shear force of more than 1000N, and a UV spray pattern to achieve the transformation of the gypsum board from a base material to a surface material, adapting to the needs of market customers, making construction more convenient and quick, and meeting the construction requirements of prefabricated buildings.

[0057] Use high-weight face paper, increase the amount of glass fiber, and add wood fiber and vinyl acetate homopolymer emulsion to enhance toughness, so that heavy objects can be hung, ensure the durability of the gypsum board, and spray patterns to achieve a beautiful decorative effect.

[0058] The preparation method of gypsum powder is:

[0059] After calcination, the desulfurized gypsum removes all attached water and part of the crystal water to generate building gypsum powder with hemihydrate gypsum as the main component, which is then ground and aged to obtain gypsum powder;

[0060] Among them, the calcium sulfate dihydrate content of the desulfurized gypsum is greater than 90%, and the chloride ion content of the desulfurized gypsum is less than 300ppm;

[0061] The crystal water content of the gypsum powder is 5.0-5.5%, the loose bulk density of the gypsum powder is 800-850g / L, and the temperature of the gypsum powder after aging is 45-60°C.

[0062] The gypsum powder prepared by the above method is more uniform and can improve the strength and toughness of the finished gypsum board.

[0063] When the foaming agent is foaming, the ratio of water to the foaming agent is 100:0.3-0.8, and the pressure of the compressed air is 0.20-0.25MPa. Through the above ratio, the foaming is more delicate, and the diameter of the bubble is smaller and more uniform, so that the finished gypsum board has higher strength and is not easy to crack. The foaming agent is sodium dodecyl sulfate.

[0064] In order to improve the strength and toughness of the finished gypsum board, the present application proposes to add wood fiber and emulsion into the gypsum board raw material. Specifically, the fiber content of the wood fiber is 97-99%, and the length of the wood fiber is 450-550 μm.

[0065] The emulsion is a vinyl acetate homopolymer, and the solid content of the emulsion is 45-55%.

[0066] By adding wood fiber and emulsion to the existing gypsum board raw material formula, the strength and toughness of the gypsum board can be significantly improved.

[0067] The monofilament diameter of the glass fiber is 10-15 μm, and the length of the glass fiber is 9-15 mm;

[0068] The coagulant is gypsum powder, the specific surface area of ​​the gypsum powder is 12000-15000cm2 / g, and the moisture content of the gypsum powder is less than 1.5%;

[0069] Corn starch is used for bonding of face paper to improve the toughness of gypsum board and make it less prone to cracking. Corn starch is modified corn starch, and the preparation method of modified corn starch is as follows:

[0070] Disperse starch in water, adjust the temperature to 30-40°C, and adjust the pH value of the starch dispersion with acetic acid to 5-6;

[0071] adding an oxidant solution to carry out an oxidation reaction, wherein the oxidant is hydrogen peroxide;

[0072] The remaining oxidant is neutralized with alkali solution and washed with water for multiple times, wherein the alkali solution used for neutralization is sodium hydroxide solution; the remaining oxidant is neutralized with alkali solution and washed with water for multiple times to remove the residual oxidant and by-products;

[0073] The oxidized starch is dried to obtain modified corn starch.

[0074] After drying the modified starch, a ball mill is used to refine the starch;

[0075] The large particles are removed by sieving to ensure the uniformity of starch particles and obtain modified corn starch.

[0076] Through micronization, the size of starch particles is reduced, the surface area is increased, and its dispersibility and viscosity are improved.

[0077] The present application also provides a construction process of a gypsum-based integrated wallboard, wherein the gypsum-based integrated wallboard prepared by the above-mentioned preparation method comprises the following steps:

[0078] Open joint grooves for integrated wall panels;

[0079] Paste gypsum on the wall surface, and then paste the slotted integrated wall panels through the gypsum, and splice adjacent integrated wall panels through the splicing grooves;

[0080] The joints between adjacent integrated wall panels are covered with edge banding strips.

[0081] Realize the transformation of gypsum board from base material to surface material, adapt to the needs of market customers, make construction more convenient and quick, and meet the construction requirements of prefabricated buildings.

[0082] The following is further described in conjunction with specific embodiments:

[0083] Embodiment 1:

[0084] The raw materials of the gypsum board slurry include, by weight: 100 parts of gypsum powder, 65 parts of water, 2 parts of wood fiber, 2.5 parts of emulsion, 0.8 parts of glass fiber, 0.3 parts of water reducing agent, 0.2 parts of starch, 0.1 parts of coagulant, and 0.01 parts of foaming agent.

[0085] The monofilament diameter of the glass fiber is 10 μm, and the length of the glass fiber is 9 mm; the fiber content of the wood fiber is 97%, and the length of the wood fiber is 450 μm. The coagulant is gypsum powder, the specific surface area of ​​the gypsum powder is 12000 cm2 / g, and the water content of the gypsum powder is less than 1.5%; the emulsion is vinyl acetate homopolymer, and the solid content of the emulsion is 45%. The corn starch is modified corn starch, and the preparation method of the modified corn starch is as follows: dispersing the starch in water, adjusting the temperature to 30°C, adjusting the pH value of the starch dispersion with acetic acid to make the pH value 5; adding hydrogen peroxide to carry out oxidation reaction; neutralizing the remaining oxidant with sodium hydroxide solution, and washing with water for multiple times; drying the modified starch and then using a ball mill to refine the starch; removing large particles by screening to ensure the uniformity of starch particles, and obtaining modified corn starch.

[0086] The gypsum powder, glass fiber, wood fiber, corn starch and coagulant are respectively conveyed into a mixing reamer after metering, and are evenly mixed and then enter a mixer; wherein the preparation method of the gypsum powder is as follows: the desulfurized gypsum is calcined to remove all attached water and part of crystal water to generate building gypsum powder with hemihydrate gypsum as the main component, and the gypsum powder is obtained by grinding and aging; wherein the calcium sulfate dihydrate content of the desulfurized gypsum is greater than 90%, and the chloride ion content of the desulfurized gypsum is less than 300ppm; the crystal water content of the gypsum powder is 5.0%, the loose bulk density of the gypsum powder is 800g / L, and the temperature of the gypsum powder after aging is 45°C.

[0087] Dilute the emulsion with water in a 1:1 ratio and mix well before metering and conveying into the mixer;

[0088] The water reducing agent is metered and transported into the mixer;

[0089] After the foaming agent and water are evenly mixed, they enter the foaming equipment together with the compressed air to form uniform foam and enter the mixer; when the foaming agent is foaming, the ratio of water to the foaming agent is 100:0.3, and the pressure of the compressed air is 0.20MPa.

[0090] Clean water is delivered into the mixer by metering;

[0091] Stir the above dry and wet materials into a uniform slurry;

[0092] The lower face paper moves forward along with the forming belt, passes through the UV spraying equipment, and is continuously sprayed with patterns online;

[0093] After UV spraying, the lower face paper moves to the forming table, and the slurry is continuously poured on the lower face paper passing through the forming table, and the upper face paper that is continuously pulled out passes through the extrusion molding machine to form a wet board;

[0094] The wet board solidifies on the forming belt and is cut, dried, sawed, edge-sealed and packaged to prepare the finished gypsum board.

[0095] Embodiment 2:

[0096] The raw materials of the gypsum board slurry include, by weight: 100 parts of gypsum powder, 70 parts of water, 3 parts of wood fiber, 4 parts of emulsion, 0.91 parts of glass fiber, 0.45 parts of water reducer, 0.3 parts of starch, 0.2 parts of coagulant, and 0.015 parts of foaming agent.

[0097] The monofilament diameter of the glass fiber is 12 μm, and the length of the glass fiber is 12 mm; the fiber content of the wood fiber is 98%, and the length of the wood fiber is 500 μm. The coagulant is gypsum powder, the specific surface area of ​​the gypsum powder is 13000 cm2 / g, and the water content of the gypsum powder is less than 1.5%; the emulsion is vinyl acetate homopolymer, and the solid content of the emulsion is 50%. The corn starch is modified corn starch, and the preparation method of the modified corn starch is as follows: dispersing the starch in water, adjusting the temperature to 35°C, adjusting the pH value of the starch dispersion with acetic acid to make the pH value 5.5; adding hydrogen peroxide to carry out oxidation reaction; neutralizing the remaining oxidant with sodium hydroxide solution, and washing with water for multiple times; drying the modified starch and then using a ball mill to refine the starch; removing large particles by screening to ensure the uniformity of starch particles, and obtaining modified corn starch.

[0098] The gypsum powder, glass fiber, wood fiber, corn starch and coagulant are respectively conveyed into a mixing reamer after metering, and are evenly mixed and then enter a mixer; wherein the preparation method of the gypsum powder is as follows: the desulfurized gypsum is calcined to remove all attached water and part of crystal water to generate a building gypsum powder with hemihydrate gypsum as the main component, and the gypsum powder is obtained by grinding and aging; wherein the calcium sulfate dihydrate content of the desulfurized gypsum is greater than 90%, and the chloride ion content of the desulfurized gypsum is less than 300ppm; the crystal water content of the gypsum powder is 5.3%, the loose bulk density of the gypsum powder is 8200g / L, and the temperature of the gypsum powder after aging is 50°C.

[0099] Dilute the emulsion with water in a 1:1 ratio and mix well before metering and conveying into the mixer;

[0100] The water reducing agent is metered and transported into the mixer;

[0101] After the foaming agent and water are evenly mixed, they enter the foaming equipment together with the compressed air to form uniform foam and enter the mixer; when the foaming agent is foaming, the ratio of water to the foaming agent is 100:0.6, and the pressure of the compressed air is 0.22MPa.

[0102] Clean water is delivered into the mixer by metering;

[0103] Stir the above dry and wet materials into a uniform slurry;

[0104] The lower face paper moves forward along with the forming belt, passes through the UV spraying equipment, and is continuously sprayed with patterns online;

[0105] After UV spraying, the lower face paper moves to the forming table, and the slurry is continuously poured on the lower face paper passing through the forming table, and the upper face paper that is continuously pulled out passes through the extrusion molding machine to form a wet board;

[0106] The wet board solidifies on the forming belt and is cut, dried, sawed, edge-sealed and packaged to prepare the finished gypsum board.

[0107] Embodiment 3:

[0108] The raw materials of the gypsum board slurry include, by weight: 100 parts of gypsum powder, 80 parts of water, 4 parts of wood fiber, 5 parts of emulsion, 1 part of glass fiber, 0.6 parts of water reducing agent, 0.4 parts of starch, 0.3 parts of coagulant, and 0.02 parts of foaming agent.

[0109] The monofilament diameter of the glass fiber is 15 μm, and the length of the glass fiber is 15 mm; the fiber content of the wood fiber is 99%, and the length of the wood fiber is 550 μm. The coagulant is gypsum powder, the specific surface area of ​​the gypsum powder is 15000 cm2 / g, and the water content of the gypsum powder is less than 1.5%; the emulsion is vinyl acetate homopolymer, and the solid content of the emulsion is 55%. The corn starch is modified corn starch, and the preparation method of the modified corn starch is as follows: dispersing the starch in water, adjusting the temperature to 40°C, adjusting the pH value of the starch dispersion with acetic acid to make the pH value 6; adding hydrogen peroxide to carry out oxidation reaction; neutralizing the remaining oxidant with sodium hydroxide solution, and washing with water for multiple times; drying the modified starch and then using a ball mill to refine the starch; removing large particles by screening to ensure the uniformity of starch particles, and obtaining modified corn starch.

[0110] The gypsum powder, glass fiber, wood fiber, corn starch and coagulant are respectively conveyed into a mixing reamer after metering, and are evenly mixed and then enter a mixer; wherein the preparation method of the gypsum powder is as follows: the desulfurized gypsum is calcined to remove all attached water and part of crystal water to generate building gypsum powder with hemihydrate gypsum as the main component, and the gypsum powder is obtained by grinding and aging; wherein the calcium sulfate dihydrate content of the desulfurized gypsum is greater than 90%, and the chloride ion content of the desulfurized gypsum is less than 300ppm; the crystal water content of the gypsum powder is 5.5%, the loose bulk density of the gypsum powder is 850g / L, and the temperature of the gypsum powder after aging is 60°C.

[0111] Dilute the emulsion with water in a 1:1 ratio and mix well before metering and conveying into the mixer;

[0112] The water reducing agent is metered and transported into the mixer;

[0113] After the foaming agent and water are evenly mixed, they enter the foaming equipment together with the compressed air to form uniform foam and enter the mixer; when the foaming agent is foaming, the ratio of water to the foaming agent is 100:0.8, and the pressure of the compressed air is 0.25MPa.

[0114] Clean water is delivered into the mixer by metering;

[0115] Stir the above dry and wet materials into a uniform slurry;

[0116] The lower face paper moves forward along with the forming belt, passes through the UV spraying equipment, and is continuously sprayed with patterns online;

[0117] After UV spraying, the lower face paper moves to the forming table, and the slurry is continuously poured on the lower face paper passing through the forming table, and the upper face paper that is continuously pulled out passes through the extrusion molding machine to form a wet board;

[0118] The wet board solidifies on the forming belt and is cut, dried, sawed, edge-sealed and packaged to prepare the finished gypsum board.

[0119] Comparative Example 1: Commercially available gypsum board.

[0120] Strength tests were performed on the above-mentioned Examples 1-3 and the comparative example respectively.

[0121] The test results are shown in the following table:

[0122]

[0123]

[0124] From the analysis of the above table, the following conclusions can be drawn: the 12mm thick gypsum-based integrated wallboard prepared by the above method has a transverse breaking load of more than 500N, a longitudinal breaking load of more than 1000N, and a shear force of more than 1000N, and has ultra-high strength.

[0125] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A method for preparing a gypsum-based integrated wallboard, characterized in that: The following steps are involved: The gypsum powder, glass fiber, wood fiber, corn starch and coagulant are respectively conveyed into the mixing reamer after metering, and then evenly mixed and then fed into the mixer; Dilute the emulsion with water in a 1:1 ratio and mix well before metering and conveying into the mixer; The water reducing agent is metered and transported into the mixer; After the foaming agent and water are evenly mixed, they enter the foaming equipment together with the compressed air to form uniform foam that enters the mixer; Clean water is delivered into the mixer by metering; Stir the above dry and wet materials into a uniform slurry; The lower face paper moves forward along with the forming belt, passes through the UV spraying equipment, and is continuously sprayed with patterns online; After UV spraying, the lower face paper moves to the forming table, and the slurry is continuously poured on the lower face paper passing through the forming table, and the upper face paper that is continuously pulled out passes through the extrusion molding machine to form a wet board; The wet board solidifies on the forming belt and is cut, dried, sawed, edge-sealed and packaged to prepare the finished gypsum board.

2. The method for preparing a gypsum-based integrated wallboard according to claim 1, characterized in that: The raw materials of gypsum board slurry include, by weight: 100 parts of gypsum powder, 65-80 parts of water, 2-4 parts of wood fiber, 2.5-5 parts of emulsion, 0.8-1 part of glass fiber, 0.3-0.6 parts of water reducing agent, 0.2-0.4 parts of starch, 0.1-0.3 parts of coagulant, and 0.01-0.02 parts of foaming agent.

3. The method for preparing a gypsum-based integrated wallboard according to claim 2, characterized in that: The preparation method of gypsum powder is: After calcination, the desulfurized gypsum removes all attached water and part of the crystal water to generate building gypsum powder with hemihydrate gypsum as the main component, which is then ground and aged to obtain gypsum powder; Among them, the calcium sulfate dihydrate content of the desulfurized gypsum is greater than 90%, and the chloride ion content of the desulfurized gypsum is less than 300ppm; The crystal water content of the gypsum powder is 5.0-5.5%, the loose bulk density of the gypsum powder is 800-850g / L, and the temperature of the gypsum powder after aging is 45-60°C.

4. The method for preparing a gypsum-based integrated wallboard according to claim 2, characterized in that: When the foaming agent is foaming, the ratio of water to the foaming agent is 100:0.3-0.8, and the pressure of the compressed air is 0.20-0.25MPa.

5. The method for preparing a gypsum-based integrated wallboard according to claim 2, characterized in that: The monofilament diameter of the glass fiber is 10-15 μm, and the length of the glass fiber is 9-15 mm; The fiber content of the wood fiber is 97-99%, and the length of the wood fiber is 450-550 μm.

6. The method for preparing a gypsum-based integrated wallboard according to claim 2, characterized in that: The coagulant is gypsum powder, the specific surface area of ​​the gypsum powder is 12000-15000cm2 / g, and the moisture content of the gypsum powder is less than 1.5%; The emulsion is a vinyl acetate homopolymer, and the solid content of the emulsion is 45-55%.

7. The method for preparing a gypsum-based integrated wallboard according to claim 6, characterized in that: The corn starch is modified corn starch, and the preparation method of the modified corn starch is as follows: Disperse starch in water and adjust the temperature to 30-40°C and pH to 5-6; adding an oxidant solution to carry out an oxidation reaction; Neutralize the remaining oxidant with lye and wash several times with water; The oxidized starch is dried to obtain modified corn starch.

8. The method for preparing a gypsum-based integrated wallboard according to claim 7, characterized in that: The pH value of the starch dispersion was adjusted with acetic acid; The oxidant is hydrogen peroxide; The alkali solution used for neutralization is sodium hydroxide solution.

9. The method for preparing a gypsum-based integrated wallboard according to claim 8, characterized in that: The invention also includes: drying the modified starch and then using a ball mill to micronize the starch; The large particles are removed by sieving to ensure the uniformity of starch particles and obtain modified corn starch.

10. A construction process for a gypsum-based integrated wallboard, characterized in that: The gypsum-based integrated wallboard prepared by the preparation method according to any one of claims 1 to 9 comprises the following steps: Open joint grooves for integrated wall panels; Paste gypsum on the wall surface, and then paste the slotted integrated wall panels through the gypsum, and splice adjacent integrated wall panels through the splicing grooves; The joints between adjacent integrated wall panels are covered with edge banding strips.

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