Mildew-proof and moisture-resistant gypsum board and manufacturing method thereof

Abstract

The present invention relates to the technical field of building materials, and in particular to a mildew-proof and moisture-resistant gypsum board, comprising the following raw materials: 5000 to 5500 parts by weight of building gypsum powder, 3200 to 3700 parts by weight of water, 5 to 15 parts by weight of glass fiber, 10 to 20 parts by weight of modified starch, 1 to 3 parts by weight of foaming agent, 5 to 210 parts by weight of waterproofing agent, and 3 to 8 parts by weight of antibacterial and mildew-proof agent. By adding the waterproofing agent, the water absorption rate of the gypsum board can be effectively reduced, the amount of water absorbed on the surface of the gypsum board can be reduced, and the moisture resistance of the gypsum board can be improved. By adding the antibacterial and mildew-proof agent, the mildew-proof grade of the gypsum board can be made to reach level 2 or below. On the whole, it is conducive to improving the problem of reduced strength of the gypsum board caused by moisture absorption and softening, the longitudinal flexural strength can be improved, and the problem of mildew and deterioration of the gypsum board in a humid environment can be effectively alleviated.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a mildew-proof and moisture-resistant gypsum board and a manufacturing method thereof. Background Art

[0002] Gypsum board is a material made of building gypsum as the main raw material. It is a building material with light weight, high strength, thin thickness, easy processing, good sound insulation, heat insulation and fire resistance. It is one of the new lightweight boards that are currently being developed. Gypsum board has been widely used in various buildings such as residences, office buildings, shops, hotels and industrial plants for interior partitions, wall coverings (instead of wall plastering), ceilings, sound-absorbing panels, ground base panels and various decorative panels.

[0003] With the progress of the times and the development of science and technology, people have an increasingly higher demand for the use of decoration materials. Gypsum boards are widely used in interior decoration. Existing gypsum boards, when used for a long time in some indoor environments that produce moisture or humidity, will absorb moisture and become soft. Some parts will become moldy or even loose and fall off. The mechanical strength and impact toughness will be greatly reduced, causing the original shape to be damaged, which not only destroys the indoor beautification environment, but also seriously affects people's quality of life.

[0004] Therefore, how to improve the moisture and mildew resistance of gypsum board has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In order to solve the problem that the existing gypsum board has low moisture and mildew resistance, the present invention provides a mildew and moisture resistant gypsum board and a manufacturing method thereof.

[0006] The invention provides a mildew-proof and moisture-resistant gypsum board for achieving the purpose of the present invention, comprising the following raw materials: 5000 to 5500 parts by weight of building gypsum powder, 3200 to 3700 parts by weight of water, 5 to 15 parts by weight of glass fiber, 10 to 20 parts by weight of modified starch, 1 to 3 parts by weight of foaming agent, 5 to 210 parts by weight of waterproofing agent and 3 to 8 parts by weight of antibacterial and mildew-proof agent.

[0007] In some specific embodiments, the waterproofing agent includes at least one of calcium stearate emulsion and hydrogen-containing silicone oil.

[0008] In some specific embodiments, the following raw material composition is also included: 5 parts by weight to 8 parts by weight of cement.

[0009] In some specific embodiments, the following raw material composition is also included: 4 parts by weight to 7 parts by weight of a retarder.

[0010] In some specific embodiments, the retarder includes boric acid and tartaric acid, and the weight ratio of boric acid to tartaric acid is 1.5-5:1.

[0011] In some specific embodiments, the following raw material composition is also included: 10 parts by weight to 30 parts by weight of a coagulant.

[0012] In some specific embodiments, the following raw material composition is also included: 10 parts by weight to 15 parts by weight of a water reducing agent.

[0013] In some specific embodiments, the pH of water is 7-8.

[0014] A method for making a mildew-proof and moisture-resistant gypsum board based on the same concept comprises the following steps:

[0015] The modified starch was ground into a powder with a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of coagulant into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then uniformly mixing the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber to form a mixed powder;

[0016] The above amount of foaming agent is acted upon by a foam generator to generate foam having a bulk density of 60 g / L;

[0017] The above amount of retarder, the above amount of antibacterial and mildew-proof agent, the above amount of water-reducing agent, the above amount of waterproofing agent and the above amount of water are uniformly mixed to form a mixed solution; the mixed powder, foam and mixed solution are placed in a mixer and stirred to form a slurry;

[0018] The slurry is sprayed onto the face paper, which is then extruded through a forming table to become a forming blank. The formed sprayed material is then placed in a drying kiln for drying at a temperature of 170°C to 190°C and a drying time of 80min to 100min.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) By adding waterproofing agent, the water absorption rate of gypsum board can be effectively reduced, and the amount of water absorbed by the surface of gypsum board can be reduced.

[0021] (2) Calcium stearate can block the pores in the gypsum by filling the mesh structure of the gypsum slurry, and will not be affected by gypsum impurities, thus playing a waterproof role. Under the action of metal catalysts, hydrogen-containing silicone oil forms a waterproof film on the surface of the gypsum core substrate, thereby playing a waterproof role. The combination of the two substances applied to gypsum boards can greatly improve the moisture and water resistance of gypsum boards.

[0022] (3) By adding antibacterial and mildew-proof agents, the mildew-proof grade of gypsum board can be raised to grade 2 or below. Overall, it is helpful to improve the problem of reduced strength of gypsum board caused by moisture absorption and softening, and the longitudinal flexural strength can be improved, effectively alleviating the problem of mildew and deterioration of gypsum board in a humid environment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0024] As described in the background technology, when the existing gypsum board is used for a long time in some indoor environments with moisture or humidity, the gypsum board will absorb moisture and become soft, and some parts will become moldy or even loose and fall off, and the mechanical strength and impact toughness will be greatly reduced, causing the original shape to be damaged, which not only destroys the indoor beautification environment, but also seriously affects people's quality of life. Therefore, how to improve the moisture and mildew resistance of gypsum board has become a technical problem that needs to be solved urgently by those skilled in the art.

[0025] To solve the above problems, in one aspect of the present application, a mildew-proof and moisture-resistant gypsum board is provided, comprising the following raw materials: 5000 to 5500 parts by weight of building gypsum powder, 3200 to 3700 parts by weight of water, 5 to 15 parts by weight of glass fiber, 10 to 20 parts by weight of modified starch, 1 to 3 parts by weight of foaming agent, 5 to 210 parts by weight of waterproofing agent, 3 to 8 parts by weight of antibacterial and mildew-proof agent, 5 to 8 parts by weight of cement, 4 to 7 parts by weight of retarder, 10 to 30 parts by weight of accelerator and 10 to 15 parts by weight of water reducing agent. Building gypsum is the basic material for making mildew-proof and moisture-resistant gypsum board. Glass fiber can effectively enhance the strength of mildew-proof and moisture-resistant gypsum board and improve the fire resistance of mildew-proof and moisture-resistant gypsum board. Modified starch is used as a binder for mildew-proof and moisture-resistant gypsum board. The foaming agent has a foaming effect, making the mildew-proof and moisture-resistant gypsum board lighter and enhancing its sound insulation and air permeability. The waterproofing agent can effectively improve the moisture-proof and waterproof performance of the mildew-proof and moisture-resistant gypsum board. The antibacterial and mildew-proof agent can effectively alleviate the problem of the board being prone to mold and deterioration in a humid environment. Cement can enhance the waterproof performance of the board. The retarder can extend the initial setting time of the gypsum, make the modified starch easier to gelatinize, and improve the bonding performance of the modified starch. The coagulant can accelerate the solidification of the gypsum. The water reducer can increase the fluidity of the gypsum slurry, effectively reduce the amount of water used for mixing, and reduce the energy consumption required for later drying, thereby reducing the production cost of the gypsum board.

[0026] Preferably, the foaming agent is sodium lauryl sulfate.

[0027] Preferably, the waterproofing agent includes at least one of calcium stearate emulsion and hydrogen-containing silicone oil. In some embodiments, the waterproofing agent is calcium stearate emulsion. In other embodiments, the waterproofing agent is hydrogen-containing silicone oil. In still other embodiments, the waterproofing agent consists of calcium stearate emulsion and hydrogen-containing silicone oil in a weight ratio of 20:1. It should be noted that when calcium stearate emulsion and hydrogen-containing silicone oil are used in combination, the moisture and humidity resistance is better than that of using only calcium stearate emulsion or hydrogen-containing silicone oil.

[0028] Preferably, the retarder includes boric acid and tartaric acid, and the weight ratio of boric acid to tartaric acid is 1.5 to 5:1. It should be noted that the retarder can also be an alkaline phosphate retarder such as sodium hexametaphosphate and sodium polyphosphate, or a protein retarder such as gelatin and peptone. Of course, different types of retarders can also be used in combination, and the combination of retarders with different retarding mechanisms produces a superposition effect to improve the use efficiency of the retarder.

[0029] Preferably, the pH of the water is 7-8.

[0030] Preferably, the antibacterial and mildewproof agent comprises the following raw materials: 1 to 2 parts by weight of mildewproof agent and 2 to 6 parts by weight of fungicide. The mildewproof agent is 2-(thiocyanate methylmercapto)benzothiazole, methylenedisulfate, 3-iodo-2-propynylcarboxylic acid butylamine, n-octyl-4-isothiazoline-3-one, octahydroxyquinoline copper or 3-iodo-2-propynylbutylcarbamate. The fungicide is N-(2-benzoimidazole)-methyl carbamate, benzisothiazolinone, polyquaternium salt, (E)-[2-[6-(2-cyanophenoxy)pyrimidin-4-yloxy]phenyl]-3-methoxyacrylate methyl ester, tetramethylthiuram disulfide, dodecyldimethylbenzylammonium bromide, flucyclostrobin or 2-(4-thiazolyl)-1H-benzimidazole.

[0031] Preferably, the coagulant is gypsum, calcium sulfate, ammonium sulfate, potassium sulfate, sodium sulfate or various alums and the like.

[0032] Preferably, the water reducer is a naphthalene-based high-efficiency water reducer.

[0033] In another aspect of the present application, a method for manufacturing a mildew-proof and moisture-resistant gypsum board is provided, comprising the following steps:

[0034] S1. Grind the above amount of modified starch into a powder with a specific surface area of ​​10000cm 2 / g of the first powder, and grind the above amount of coagulant into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then uniformly mix the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber to form a mixed powder.

[0035] S2. The above amount of foaming agent is acted upon by a foam generator to generate foam with a bulk density of 60 g / L.

[0036] S3, uniformly mix the above amount of retarder, the above amount of antibacterial and mildewproof agent, the above amount of water reducing agent, the above amount of waterproofing agent and the above amount of water to form a mixed solution. Then, the mixed powder, foam and mixed solution are placed in a mixer and stirred to form a slurry.

[0037] S4, spray the slurry onto the face paper, which is extruded into a molding blank through a molding table, and then the molding spray is placed in a drying kiln for drying at a temperature of 170℃~190℃ and a drying time of 80min~100min. It should be noted that the drying kiln is heated to 170℃~190℃ at a heating rate of 10℃~20℃ / min.

[0038] The mildew-proof and moisture-resistant gypsum board prepared by the above steps has excellent moisture-resistant and mildew-resistant properties.

[0039] Example 1

[0040] The mildew-proof and moisture-resistant gypsum board comprises the following raw materials: 5240 parts by weight of building gypsum powder, 3500 parts by weight of water (pH 7-8), 5 parts by weight of glass fiber, 20 parts by weight of modified starch, 2 parts by weight of sodium lauryl sulfate, 10 parts by weight of hydrogen-containing silicone oil, 3 parts by weight of antibacterial and mildew-proof agent, 5 parts by weight of cement, 5 parts by weight of boric acid, 1 part by weight of tartaric acid, 30 parts by weight of raw gypsum and 15 parts by weight of water reducing agent.

[0041] The method for preparing a mildew-proof and moisture-resistant gypsum board comprises the following steps: first, grinding the modified starch in the above amount into a gypsum board having a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of raw gypsum into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber are mixed evenly to form a mixed powder. Then, the above amount of sodium dodecyl sulfate is subjected to the action of a foam generator to generate a foam with a bulk density of 60g / L. Then, the above amount of boric acid, tartaric acid, the above amount of antibacterial and mildew-proof agent, the above amount of water reducer, the above amount of hydrogen-containing silicone oil and the above amount of water are mixed evenly to form a mixed solution. The mixed powder, foam and mixed solution are then placed in a mixer for stirring to form a slurry. Then, the slurry is sprayed onto the face paper, extruded through a forming table to become a forming blank, and the forming spray is placed in a drying kiln for drying at a drying temperature of 180°C and a drying time of 90min.

[0042] Example 2

[0043] The mildew-proof and moisture-resistant gypsum board comprises the following raw materials: 5240 parts by weight of building gypsum powder, 3500 parts by weight of water (with a pH value of 7-8), 5 parts by weight of glass fiber, 20 parts by weight of modified starch, 2 parts by weight of sodium lauryl sulfate, 200 parts by weight of calcium stearate emulsion, 5 parts by weight of antibacterial and mildew-proof agent, 5 parts by weight of cement, 5 parts by weight of boric acid, 1 part by weight of tartaric acid, 30 parts by weight of gypsum and 15 parts by weight of water reducing agent.

[0044] The method for preparing a mildew-proof and moisture-resistant gypsum board comprises the following steps: first, grinding the modified starch in the above amount into a gypsum board having a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of raw gypsum into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber are mixed evenly to form a mixed powder. Then, the above amount of sodium dodecyl sulfate is subjected to the action of a foam generator to generate a foam with a bulk density of 60g / L. Then, the above amount of boric acid, tartaric acid, the above amount of antibacterial and mildew-proof agent, the above amount of water reducer, the above amount of calcium stearate emulsion and the above amount of water are mixed evenly to form a mixed solution. The mixed powder, foam and mixed solution are then placed in a mixer for stirring to form a slurry. Then, the slurry is sprayed onto the face paper, extruded through a forming table to become a forming blank, and the forming spray is placed in a drying kiln for drying at a drying temperature of 180°C and a drying time of 90min.

[0045] Example 3

[0046] The mildew-proof and moisture-resistant gypsum board comprises the following raw materials: 5240 parts by weight of building gypsum powder, 3500 parts by weight of water (pH 7-8), 5 parts by weight of glass fiber, 20 parts by weight of modified starch, 2 parts by weight of sodium lauryl sulfate, 100 parts by weight of calcium stearate emulsion, 5 parts by weight of hydrogen-containing silicone oil, 8 parts by weight of antibacterial and mildew-proof agent, 5 parts by weight of cement, 5 parts by weight of boric acid, 1 part by weight of tartaric acid, 30 parts by weight of raw gypsum and 15 parts by weight of water reducing agent.

[0047] The method for preparing a mildew-proof and moisture-resistant gypsum board comprises the following steps: first, grinding the modified starch in the above amount into a gypsum board having a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of raw gypsum into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber are mixed evenly to form a mixed powder. Then, the above amount of sodium dodecyl sulfate is subjected to the action of a foam generator to generate a foam with a bulk density of 60g / L. Then, the above amount of boric acid, tartaric acid, the above amount of antibacterial and mildew-proof agent, the above amount of water reducer, the above amount of calcium stearate emulsion, the above amount of hydrogen-containing silicone oil and the above amount of water are mixed evenly to form a mixed solution. The mixed powder, foam and mixed solution are then placed in a mixer for stirring to form a slurry. Then, the slurry is sprayed onto the face paper, extruded through a forming table to become a forming blank, and the forming spray is placed in a drying kiln for drying at a drying temperature of 180°C and a drying time of 90 minutes.

[0048] Example 4

[0049] The mildew-proof and moisture-resistant gypsum board comprises the following raw materials: 5240 parts by weight of building gypsum powder, 3500 parts by weight of water (with a pH value of 7-8), 5 parts by weight of glass fiber, 20 parts by weight of modified starch, 2 parts by weight of sodium lauryl sulfate, 200 parts by weight of calcium stearate emulsion, 10 parts by weight of hydrogenated silicone oil, 8 parts by weight of antibacterial and mildew-proof agent, 5 parts by weight of cement, 5 parts by weight of boric acid, 1 part by weight of tartaric acid, 30 parts by weight of raw gypsum and 15 parts by weight of water reducing agent.

[0050] The method for preparing a mildew-proof and moisture-resistant gypsum board comprises the following steps: first, grinding the modified starch in the above amount into a gypsum board having a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of raw gypsum into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber are mixed evenly to form a mixed powder. Then, the above amount of sodium dodecyl sulfate is subjected to the action of a foam generator to generate a foam with a bulk density of 60g / L. Then, the above amount of boric acid, tartaric acid, the above amount of antibacterial and mildew-proof agent, the above amount of water reducer, the above amount of calcium stearate emulsion, the above amount of hydrogen-containing silicone oil and the above amount of water are mixed evenly to form a mixed solution. The mixed powder, foam and mixed solution are then placed in a mixer for stirring to form a slurry. Then, the slurry is sprayed onto the face paper, extruded through a forming table to become a forming blank, and the forming spray is placed in a drying kiln for drying at a drying temperature of 180°C and a drying time of 90 minutes.

[0051] Example 5

[0052] The mildew-proof and moisture-resistant gypsum board comprises the following raw materials: 5000 parts by weight of building gypsum powder, 3200 parts by weight of water (with a pH value of 7-8), 10 parts by weight of glass fiber, 10 parts by weight of modified starch, 1 part by weight of sodium lauryl sulfate, 100 parts by weight of calcium stearate emulsion, 5 parts by weight of hydrogenated silicone oil, 8 parts by weight of antibacterial and mildew-proof agent, 6 parts by weight of cement, 3 parts by weight of boric acid, 2 parts by weight of tartaric acid, 10 parts by weight of raw gypsum and 10 parts by weight of water reducing agent.

[0053] The method for preparing a mildew-proof and moisture-resistant gypsum board comprises the following steps: first, grinding the modified starch in the above amount into a gypsum board having a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of raw gypsum into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber are mixed evenly to form a mixed powder. Then, the above amount of sodium dodecyl sulfate is subjected to the action of a foam generator to generate a foam with a bulk density of 60g / L. Then, the above amount of boric acid, tartaric acid, the above amount of antibacterial and mildew-proof agent, the above amount of water reducer, the above amount of calcium stearate emulsion, the above amount of hydrogen-containing silicone oil and the above amount of water are mixed evenly to form a mixed solution. The mixed powder, foam and mixed solution are then placed in a mixer for stirring to form a slurry. Then, the slurry is sprayed onto the face paper, extruded through a forming table to become a forming blank, and the forming spray is placed in a drying kiln for drying at a drying temperature of 170°C and a drying time of 80min.

[0054] Example 6

[0055] The mildew-proof and moisture-resistant gypsum board comprises the following raw materials: 5500 parts by weight of building gypsum powder, 3700 parts by weight of water (with a pH value of 7-8), 15 parts by weight of glass fiber, 15 parts by weight of modified starch, 3 parts by weight of sodium lauryl sulfate, 100 parts by weight of calcium stearate emulsion, 5 parts by weight of hydrogenated silicone oil, 8 parts by weight of antibacterial and mildew-proof agent, 8 parts by weight of cement, 5 parts by weight of boric acid, 2 parts by weight of tartaric acid, 20 parts by weight of gypsum and 12 parts by weight of water reducing agent.

[0056] The method for preparing a mildew-proof and moisture-resistant gypsum board comprises the following steps: first, grinding the modified starch in the above amount into a gypsum board having a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of raw gypsum into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber are mixed evenly to form a mixed powder. Then, the above amount of sodium dodecyl sulfate is subjected to the action of a foam generator to generate a foam with a bulk density of 60g / L. Then, the above amount of boric acid, tartaric acid, the above amount of antibacterial and mildew-proof agent, the above amount of water reducer, the above amount of calcium stearate emulsion, the above amount of hydrogen-containing silicone oil and the above amount of water are mixed evenly to form a mixed solution. The mixed powder, foam and mixed solution are then placed in a mixer for stirring to form a slurry. Then, the slurry is sprayed onto the face paper, extruded through a forming table to become a forming blank, and the forming spray is placed in a drying kiln for drying at a drying temperature of 190°C and a drying time of 100min.

[0057] The performance of the mildew-proof and moisture-resistant gypsum boards prepared in Examples 1-6 was tested according to the GB / T9775-2008 gypsum board testing method and the JC / T2039-2010 antibacterial and mildew-proof wooden decorative board standard. The specific test results are shown in the following table:

[0058] As shown in Table 1:

[0059]

[0060]

[0061] Table 1

[0062] It can be seen from the data in Table 1 that by adding a waterproofing agent, the water absorption rate of the gypsum board can be effectively reduced, and the amount of water absorbed by the surface of the gypsum board can be reduced. Moreover, when calcium stearate emulsion and hydrogen-containing silicone oil are used in combination, the moisture and humidity resistance is better than that of calcium stearate emulsion or hydrogen-containing silicone oil alone. It should be pointed out that calcium stearate can block the pores in the gypsum by filling it in the mesh structure of the gypsum slurry, and will not be affected by gypsum impurities, thereby playing a waterproof role. Under the action of a metal catalyst, hydrogen-containing silicone oil forms a waterproof film on the surface of the gypsum core substrate to achieve a waterproof effect. The combination of the two substances is applied to the gypsum board, which can greatly improve the moisture and water resistance of the gypsum board. By adding an antibacterial and mildew-proof agent, the mildew resistance level of the gypsum board can reach level 2 or below. On the whole, it is conducive to improving the problem of low strength of the gypsum board caused by moisture absorption and softening, and the longitudinal flexural strength can be improved, which effectively alleviates the problem of mold and deterioration of the gypsum board in a humid environment.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mildew-proof and moisture-resistant gypsum board, characterized in that: The mildew-proof and moisture-resistant gypsum board comprises the following raw materials: 5240 parts by weight of building gypsum powder, 3500 parts by weight of water, 5 parts by weight of glass fiber, 20 parts by weight of modified starch, 2 parts by weight of sodium lauryl sulfate, 100 parts by weight of calcium stearate emulsion, 5 parts by weight of hydrogen-containing silicone oil, 8 parts by weight of antibacterial and mildew-proof agent, 5 parts by weight of cement, 5 parts by weight of boric acid, 1 part by weight of tartaric acid, 30 parts by weight of raw gypsum and 15 parts by weight of water reducing agent.

2. The mildew-proof and moisture-resistant gypsum board according to claim 1, characterized in that: The pH of the water is 7-8.

3. A method for manufacturing a mildew-proof and moisture-resistant gypsum board as claimed in claim 1 or 2, characterized in that: The following steps are involved: The modified starch was ground into a powder with a specific surface area of ​​10000 cm 2 / g of the first powder, and grind the above amount of raw gypsum into a powder with a specific surface area of ​​10000cm 2 / g of the second powder, and then uniformly mixing the first powder, the second powder, the above amount of building gypsum powder and the above amount of glass fiber to form a mixed powder; The above amount of sodium dodecyl sulfate is subjected to the action of a foam generator to generate foam having a bulk density of 60 g / L; The above amount of boric acid, tartaric acid, the above amount of antibacterial and mildew-proof agent, the above amount of water reducing agent, the above amount of calcium stearate emulsion, the above amount of hydrogen-containing silicone oil and the above amount of water are uniformly mixed to form a mixed solution; the mixed powder, the foam and the mixed solution are placed in a mixer and stirred to form a slurry; The slurry is sprayed onto the face paper, and is extruded through a forming table to become a molded blank, and then the molded blank is placed in a drying kiln for drying at a drying temperature of 180° C. for a drying time of 90 minutes.

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