Fire-resistant gypsum board and preparation method thereof

Abstract

The invention provides a fire-resistant gypsum board and a preparation method thereof. The fire-resistant gypsum board comprises a gypsum core material and surface protection paper compounded on two sides of the gypsum core material, the gypsum core material comprises a first refractory layer, a gypsum matrix and a second refractory layer; the first fireproof layer and the second fireproof layer are independently prepared from the following raw materials in parts by weight: 65-75 parts of aluminum minerals, 20-25 parts of siliceous minerals, 0-10 parts of a binder and 0-10 parts of glass fibers. The refractory layer is subjected to a solid-phase sintering reaction, on one hand, heat is absorbed, heat conduction is reduced, and dehydration and pulverization of the gypsum base body are slowed down, on the other hand, the refractory layer is made of mullite materials and has good mechanical performance at high temperature, when the gypsum base body is dehydrated and pulverized, supporting can still be provided for the whole suspended ceiling or wall body, overall collapse is avoided, and the service life of the whole suspended ceiling or wall body is prolonged. And the indoor personal and property safety is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of lightweight decorative building materials, and in particular relates to a fire-resistant gypsum board and a preparation method thereof. Background Art

[0002] With the frequent occurrence of fires in high-rise buildings, the fire resistance of interior decoration has attracted more and more attention from the society. Gypsum board is widely used as an internal partition material in various buildings such as residences, office buildings, shops, hotels and industrial plants. Its fire resistance directly affects people's lives and property safety. Chinese patent CN1443263 discloses that the surface of the gypsum board core board is coated with mineral fillers such as alumina, calcium carbonate, kaolin, clay and their mixtures and organic or inorganic binder coated glass fiber mat to improve the fire resistance of the gypsum board.

[0003] Although the existing technology has improved the fire resistance of gypsum board to a certain extent, the following problems still exist:

[0004] 1. Adding a large amount of non-bonding mineral additives to the core of the gypsum board destroys the integrity of the gypsum substrate, resulting in a significant reduction in the mechanical properties of the gypsum board. At the same time, the excessive dispersion of minerals significantly reduces the fire resistance.

[0005] 2. Inorganic mineral fillers are coated on the surface of the board core to form a fireproof layer. Although the refractory minerals have high temperature stability, the fireproof layer will still conduct all the heat to the gypsum substrate, causing the gypsum substrate to dehydrate and powder and lose its mechanical properties, thus causing the gypsum board ceiling or wall to collapse.

[0006] Therefore, there is an urgent need for a gypsum board that has both good fire resistance and a certain strength at high temperatures. Summary of the invention

[0007] The object of the present invention is to provide a fire-resistant gypsum board and a preparation method thereof. The fire-resistant gypsum board of the present invention has good fireproof performance and good mechanical properties at high temperatures, avoiding overall collapse caused by dehydration and powderization of the gypsum substrate.

[0008] The present invention provides a fire-resistant gypsum board, comprising a gypsum core material and a facing paper composited on both sides of the gypsum core material; the gypsum core material comprises a first fire-resistant layer, a gypsum matrix and a second fire-resistant layer;

[0009] The first refractory layer and the second refractory layer independently include the following raw materials in parts by weight:

[0010] Aluminum mineral: 65-75 parts, siliceous mineral: 20-25 parts, binder: 0-10 parts, glass fiber: 0-10 parts, water 40-50 parts;

[0011] The gypsum matrix comprises the following raw materials in parts by weight:

[0012] Building gypsum: 100 parts, glass fiber: 0.5-5 parts, starch: 0.1-2 parts, water reducing agent: 0.2-2 parts, foaming agent: 0.1-1 parts, water: 60-70 parts.

[0013] Preferably, the aluminum mineral includes one or more of corundum, bauxite, alunite kaolin and mullite; and the particle size of the aluminum mineral is 250-350 mesh.

[0014] Preferably, the siliceous mineral includes one or more of quartz, feldspar, kaolin and mullite; and the particle size of the siliceous mineral is 250-300 meshes.

[0015] Preferably, the aluminum in the aluminum mineral is calculated as aluminum oxide, the silicon in the siliceous mineral is calculated as silicon oxide, and the mass ratio of the aluminum in the aluminum mineral to the silicon in the siliceous mineral is (2 to 2.55):1.

[0016] Preferably, a transition layer is provided between the face paper and the first fire-resistant layer, between the first fire-resistant layer and the gypsum matrix, between the gypsum matrix and the second fire-resistant layer, and between the second fire-resistant layer and the face paper;

[0017] The raw materials for preparing the transition layer are obtained by mixing the raw materials for preparing the refractory layer and the raw materials for preparing the gypsum matrix in a mass ratio of (1-2):1.

[0018] Preferably, the thickness of the first fire-resistant layer is 0.5-2 mm, and the thickness of the second fire-resistant layer is 0.5-2 mm.

[0019] Preferably, the thickness of the gypsum matrix is ​​8.0-12.0 mm; the thickness of the transition layer is 0.2-1 mm.

[0020] The present invention provides a method for preparing the fire-resistant gypsum board as described above, comprising the following steps:

[0021] A) mixing raw materials for preparing the refractory layer to obtain a refractory slurry, mixing raw materials for preparing the gypsum matrix to obtain a gypsum-based slurry, and mixing the refractory slurry and the gypsum-based slurry in a mass ratio of (1-2):1 to obtain a transition slurry;

[0022] B) sequentially coating the surface of the face paper with a transition slurry, a refractory slurry and a transition slurry to obtain a treated face paper;

[0023] C) coating a gypsum-based slurry between the transition layers of the two treated face papers, and drying the slurry after solidification to obtain a fire-resistant gypsum board.

[0024] Preferably, the curing temperature in step C) is 30-40° C., and the curing time in step C) is 210-240 seconds.

[0025] Preferably, the drying temperature in step C) is 110-320° C., and the drying time in step C) is 30-50 min.

[0026] The invention provides a fire-resistant gypsum board, comprising a gypsum core material and facing paper composited on both sides of the gypsum core material; the gypsum core material comprises a first fire-resistant layer, a gypsum matrix and a second fire-resistant layer; the first fire-resistant layer and the second fire-resistant layer independently comprise the following raw materials in parts by weight: aluminum mineral: 65-75 parts, siliceous mineral: 20-25 parts, binder: 0-10 parts, glass fiber: 0-10 parts; the gypsum matrix comprises the following raw materials in parts by weight: building gypsum: 100 parts, binder: 0.5-10 parts, glass fiber: 0.5-5 parts, starch: 0.1-2 parts, water reducer: 0.2-2 parts, foaming agent: 0.1-1 parts, water: 60-70 parts. When the refractory layer in the present invention encounters a fire, the refractory layer absorbs the heat of the flame, and the silicon mineral raw materials and the aluminum mineral raw materials undergo solid-phase sintering in proportion to produce mullite, which has excellent high-temperature stability. Even under high-temperature conditions of 1300°C, the strength loss is very small, and the performance of the mullite produced by solid-phase sintering is outstanding as the temperature rises. The solid-phase sintering reaction of the refractory layer absorbs heat on the one hand, reduces heat conduction, and thus slows down the dehydration and pulverization of the gypsum matrix. On the other hand, the mullite material produced by the refractory layer has good mechanical properties at high temperatures. When the gypsum matrix is ​​dehydrated and pulverized, it can still provide support for the overall ceiling or wall, avoiding overall collapse and ensuring the safety of people and property indoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 This is a schematic diagram of the structure of a fire-resistant gypsum board in an embodiment of the present invention;

[0029] 1 is the face paper, 2 is the transition layer, 3 is the fireproof layer, and 4 is the gypsum matrix. DETAILED DESCRIPTION

[0030] The present invention provides a fire-resistant gypsum board, comprising a gypsum core material and a facing paper composited on both sides of the gypsum core material; the gypsum core material comprises a first fire-resistant layer, a gypsum matrix and a second fire-resistant layer;

[0031] The first refractory layer and the second refractory layer independently include the following raw materials in parts by weight:

[0032] Aluminum mineral: 65-75 parts, siliceous mineral: 20-25 parts, binder: 0-10 parts, glass fiber: 0-10 parts, water 40-50 parts;

[0033] The gypsum matrix comprises the following raw materials in parts by weight:

[0034] Building gypsum: 100 parts, glass fiber 0.5-5 parts, starch: 0.1-2 parts, water reducing agent: 0.2-2 parts, foaming agent: 0.1-1 parts, water: 60-70 parts.

[0035] In one embodiment of the present invention, the fire-resistant gypsum board has Figure 1 In the structure shown, both sides of the gypsum matrix are respectively compounded with refractory layers, the outer sides of the refractory layers are compounded with facing paper, and transition layers are used to connect the gypsum matrix and the refractory layer, and between the refractory layer and the facing paper.

[0036] In the raw materials for preparing the gypsum matrix, the weight proportion of the glass fiber is preferably 0.5 to 5 parts, more preferably 1 to 4 parts, such as 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0037] In the raw materials for preparing the gypsum matrix, the weight proportion of the starch is preferably 0.1 to 2 parts, more preferably 0.5 to 1.5 parts, such as 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0038] In the raw materials for preparing the gypsum matrix, the water reducer is preferably a polycarboxylic acid high-efficiency water reducer; the weight proportion of the water reducer is preferably 0.2 to 2 parts, more preferably 0.5 to 1.5 parts, such as 0.2 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0039] In the raw materials for preparing the gypsum matrix, the foaming agent is preferably an anionic foaming agent; the weight proportion of the foaming agent is preferably 0.1 to 1 part, more preferably 0.2 to 0.8 part, such as 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, preferably a range value with any of the above values ​​as the upper or lower limit.

[0040] In the raw materials for preparing the gypsum matrix, the weight proportion of water is preferably 60 to 70 parts, more preferably 63 to 68 parts, such as 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, and 70 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0041] In the present invention, the thickness of the gypsum matrix is ​​preferably 8.0 to 12.0 mm.

[0042] Among the raw materials for preparing the first refractory layer and / or the second refractory layer, the aluminum mineral is preferably one or more of corundum, bauxite, alunite kaolin and mullite; the particle size of the aluminum mineral is preferably 250-350 mesh, more preferably 300 mesh, and the weight proportion of the aluminum mineral is preferably 65-75 parts, such as 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0043] Among the raw materials for preparing the first refractory layer and / or the second refractory layer, the siliceous mineral is preferably one or more of quartz, feldspar, kaolin and mullite; the particle size of the siliceous mineral is preferably 250-350 mesh, more preferably 300 mesh, and the weight proportion of the siliceous mineral is preferably 20-25 parts, such as 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0044] In the present invention, the mass ratio of the aluminum in the aluminum mineral to the silicon in the siliceous mineral, calculated on the basis of aluminum oxide and silicon oxide, is preferably (2-2.55):1, more preferably (2.1-2.5):1, such as 2:1, 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.55:1, and preferably a range value with any of the above values ​​as the upper or lower limit.

[0045] In the present invention, the kaolin and mullite contain both silicon and aluminum, and can be used as the source of aluminum minerals and silicon minerals at the same time, and can also be used in combination with other silicon minerals and aluminum minerals.

[0046] Among the raw materials for preparing the first refractory layer and / or the second refractory layer, the binder is preferably one or more of water glass, dextrin and tetraethyl orthosilicate; the weight proportion of the binder is preferably 0 to 10 parts, more preferably 1 to 8 parts, such as 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0047] In the raw materials for preparing the first refractory layer and / or the second refractory layer, the weight proportion of the glass fiber is preferably 0 to 10 parts, more preferably 1 to 8 parts, such as 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, preferably a range value with any of the above values ​​as the upper or lower limit.

[0048] In the present invention, the thickness of the first refractory layer is preferably 0.5-2 mm, more preferably 1-1.5 mm, the thickness of the second refractory layer is preferably 0.5-2 mm, more preferably 1-1.5 mm, the thickness of the first refractory layer and the second refractory layer may be the same or different, the composition and ratio of the first refractory layer and the composition and ratio of the second refractory layer may be the same or different, and in the present invention, the thickness and composition of the first refractory layer and the second refractory layer are preferably the same. In a fire environment, after the gypsum board reaches a certain temperature, the silicon-aluminum raw material of the refractory layer undergoes solid-phase sintering, and while consuming heat, the refractory layer generates mullite material, and the high temperature resistance and high temperature creep resistance are greatly improved compared to the normal use state.

[0049] In the present invention, the raw materials for preparing the transition layer are obtained by mixing the raw materials for preparing the refractory layer and the raw materials for preparing the gypsum matrix in a mass ratio of (1-2):1, preferably (1.2-1.8):1, such as 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, preferably a range value with any of the above values ​​as the upper or lower limit; the transition layer can make the refractory layer better adhere to the face paper and the gypsum matrix without stratification.

[0050] In the present invention, the thickness of the transition layer is preferably 0.1-0.3 mm, more preferably 0.2 mm; the thickness and composition of the multiple transition layers may be the same or different. In one embodiment of the present invention, the thickness and composition of the transition layers are preferably the same.

[0051] The present invention also provides a method for preparing a fire-resistant gypsum board, comprising the following steps:

[0052] A) mixing raw materials for preparing the refractory layer to obtain a refractory slurry, mixing raw materials for preparing the gypsum matrix to obtain a gypsum-based slurry, and mixing the refractory slurry and the gypsum-based slurry in a mass ratio of (1-2):1 to obtain a transition slurry;

[0053] B) sequentially coating the surface of the face paper with a transition slurry, a refractory slurry and a transition slurry to obtain a treated face paper;

[0054] C) coating a gypsum-based slurry between the transition layers of the two treated face papers, and drying the slurry after solidification to obtain a fire-resistant gypsum board.

[0055] The present invention first prepares refractory slurry, gypsum-based slurry and transition slurry respectively. The present invention stirs and mixes the raw materials for preparing the refractory layer, the raw materials for preparing the gypsum matrix and the raw materials for preparing the transition layer according to the types and weight proportions described above to obtain refractory slurry, gypsum-based slurry and transition slurry respectively.

[0056] After obtaining the refractory slurry, the gypsum-based slurry and the transition slurry, the present invention sequentially spreads the transition slurry, the refractory slurry and the transition slurry on the face paper to obtain the treated face paper.

[0057] Then, two layers of treated face paper are taken, and gypsum-based slurry is spread between the two layers of treated face paper, solidified into shape, and then dried to remove excess moisture, thereby obtaining a fire-resistant gypsum board.

[0058] In the present invention, the curing temperature is preferably 30 to 40° C., and the curing time is preferably 210 to 240 seconds, more preferably 220 to 230 seconds.

[0059] In the present invention, the drying temperature is preferably 110-320°C, more preferably 150-300°C, such as 110°C, 150°C, 200°C, 250°C, 300°C, 320°C, preferably a range value with any of the above values ​​as the upper or lower limit; the drying time is preferably 30-50 min, more preferably 35-45 min.

[0060] The invention provides a fire-resistant gypsum board, comprising a gypsum core material and facing paper composited on both sides of the gypsum core material; the gypsum core material comprises a first fire-resistant layer, a gypsum matrix and a second fire-resistant layer; the first fire-resistant layer and the second fire-resistant layer independently comprise the following raw materials in parts by weight: aluminum mineral: 65-75 parts, siliceous mineral: 20-25 parts, binder: 0-10 parts, glass fiber: 0-10 parts; the gypsum matrix comprises the following raw materials in parts by weight: building gypsum: 100 parts, glass fiber: 0.5-5 parts, starch: 0.1-2 parts, water reducer: 0.2-2 parts, foaming agent: 0.1-1 parts, water: 60-70 parts. When the refractory layer in the present invention encounters a fire, the refractory layer absorbs the heat of the flame, and the silicon mineral raw materials and the aluminum mineral raw materials undergo solid-phase sintering in proportion to produce mullite, which has excellent high-temperature stability. Even under high-temperature conditions of 1300°C, the strength loss is very small, and the performance of the mullite produced by solid-phase sintering is outstanding as the temperature rises. The solid-phase sintering reaction of the refractory layer absorbs heat on the one hand, reduces heat conduction, and thus slows down the dehydration and pulverization of the gypsum matrix. On the other hand, the mullite material produced by the refractory layer has good mechanical properties at high temperatures. When the gypsum matrix is ​​dehydrated and pulverized, it can still provide support for the overall ceiling or wall, avoiding overall collapse and ensuring the safety of people and property indoors.

[0061] In order to further illustrate the present invention, a fire-resistant gypsum board and a preparation method thereof provided by the present invention are described in detail below in conjunction with embodiments, but it should not be construed as limiting the scope of protection of the present invention.

[0062] Example 1

[0063] 100 parts by weight of mullite powder (fineness 300 mesh) and 1 part by weight of glass fiber are mixed evenly, and then 50 parts by weight of water mixed with 5 parts by weight of dextrin are introduced into the mixture to form mullite slurry in a small mixer.

[0064] 100 parts by weight of building gypsum, 1 part by weight of acidified starch, 0.5 parts by weight of naphthalene-based high-efficiency water reducing agent, 0.2 parts by weight of anionic foaming agent, 2 parts by weight of glass fiber and 65 parts by weight of water were stirred in a mixer at a speed of 300 r / min for 3 seconds until uniform to obtain gypsum slurry.

[0065] The gypsum slurry and the mullite slurry are mixed in a ratio of 1:2 to form a transition layer slurry.

[0066] In the moving direction of the facing paper, the transition layer slurry discharge port 1, the mullite slurry discharge port, the transition layer slurry discharge port 2, and the gypsum slurry discharge port are arranged in sequence, and each layer of slurry is evenly spread between two layers of facing paper, and after solidification and forming, it enters the dryer for drying at a drying temperature of 210°C and a drying time of 40 minutes to obtain a 10mm thick fire-resistant gypsum board A.

[0067] Example 2

[0068] After 75 parts by weight of corundum powder (fineness 300 mesh), 25 parts by weight of quartz (fineness 300 mesh) and 1 part by weight of glass fiber are uniformly mixed, 5 parts by weight of dextrin and 50 parts by weight of water are introduced into the mixture and mixed into a refractory slurry in a small mixer.

[0069] 100 parts by weight of building gypsum, 1 part by weight of acidified starch, 0.5 parts by weight of naphthalene-based high-efficiency water reducing agent, 0.2 parts by weight of anionic foaming agent, 2 parts by weight of glass fiber and 65 parts by weight of water were stirred in a mixer at a speed of 300 r / min for 3 seconds until uniform to obtain gypsum slurry.

[0070] Gypsum slurry and refractory slurry are mixed in a ratio of 1:2 to form a transition layer slurry.

[0071] In the moving direction of the facing paper, the transition layer slurry discharge port 1, the refractory slurry discharge port, the transition layer slurry discharge port 2 and the gypsum slurry discharge port are arranged in sequence, and each layer of slurry is evenly spread between two layers of facing paper, and after solidification and forming, it enters the dryer for drying at a drying temperature of 210°C and a drying time of 40 minutes to obtain a 10mm thick refractory gypsum board B.

[0072] Example 3

[0073] After 40 parts by weight of kaolin (fineness 300 mesh), 55 parts by weight of high-alumina (fineness 300 mesh) and 1 part by weight of glass fiber are uniformly mixed, 5 parts by weight of water glass and 50 parts by weight of water are introduced into the mixture and mixed into a refractory slurry in a small mixer.

[0074] 100 parts by weight of building gypsum, 1 part by weight of acidified starch, 0.5 parts by weight of naphthalene-based high-efficiency water reducing agent, 0.2 parts by weight of anionic foaming agent, 2 parts by weight of glass fiber and 65 parts by weight of water were stirred in a mixer at a speed of 300 r / min for 3 seconds until uniform to obtain gypsum slurry.

[0075] The gypsum slurry and the refractory slurry are mixed in a ratio of 1:1 to form a transition layer slurry.

[0076] In the moving direction of the facing paper, the transition layer slurry discharge port 1, the refractory slurry discharge port, the transition layer slurry discharge port 2 and the gypsum slurry discharge port are arranged in sequence, and each layer of slurry is evenly spread between two layers of facing paper, and after solidification and forming, it enters the dryer for drying at a drying temperature of 210°C and a drying time of 40 minutes to obtain a 10mm thick refractory gypsum board C.

[0077] Example 4

[0078] 100 parts by weight of building gypsum, 75 parts by weight of corundum powder (fineness 300 mesh), 25 parts by weight of quartz (fineness 300 mesh), 1 part by weight of acidified starch, 0.5 parts by weight of naphthalene-based high-efficiency water reducing agent, 0.2 parts by weight of anionic foaming agent, 3 parts by weight of glass fiber and 65 parts by weight of water were stirred in a mixer at a speed of 300 r / min for 3 seconds until uniform to obtain a gypsum refractory slurry.

[0079] In the moving direction of the facing paper, the gypsum refractory slurry is evenly spread between two layers of facing paper, solidified and formed, and then put into the dryer for drying at a drying temperature of 210°C and a drying time of 40 minutes to obtain a 10 mm thick refractory gypsum board (control board).

[0080] Application Examples

[0081] The shrinkage behavior of the fire-resistant boards A, B, C prepared in Examples 1, 2, 3 and the control board was measured.

[0082] At 1000°C without applying any mechanical stress, the volume shrinkage was recorded at 15 min, 30 min, 45 min, and 60 min, as shown in Table 1.

[0083] Table 1 Volume shrinkage of fire-resistant gypsum board in the embodiment

[0084]

[0085] The thermal conductivity of the fire-resistant boards A, B, C prepared in Examples 1, 2, and 3 and the control board (ordinary fire-resistant gypsum board) was measured.

[0086] Thermal stress was applied to one side of the test sample in a muffle furnace at a constant temperature of 1000°C.

[0087] The temperature of the unexposed surface of the sample was recorded. According to the fire wall and thermal insulation classification standard described in EN1361, the time required for the highest temperature point of the unexposed surface to reach 140°C was measured. Each sample was tested four times. The results are shown in Table 2.

[0088] Table 2 Time for fire-resistant gypsum board to reach temperature in the embodiment

[0089]

[0090] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fire-resistant gypsum board, comprising a gypsum core material and a facing paper composited on both sides of the gypsum core material; the gypsum core material comprises a first fire-resistant layer, a gypsum matrix and a second fire-resistant layer; The first refractory layer and the second refractory layer independently include the following raw materials in parts by weight: Aluminum mineral: 65-75 parts, siliceous mineral: 20-25 parts, binder: 0-10 parts, glass fiber: 0-10 parts, water 40-50 parts; The gypsum matrix comprises the following raw materials in parts by weight: Building gypsum: 100 parts, glass fiber: 0.5-5 parts, starch: 0.1-2 parts, water reducing agent: 0.2-2 parts, foaming agent: 0.1-1 parts, water: 60-70 parts.

2. The fire-resistant gypsum board according to claim 1, characterized in that: The aluminum mineral includes one or more of corundum, bauxite, alunite kaolin and mullite; the particle size of the aluminum mineral is 250-350 meshes.

3. The fire-resistant gypsum board according to claim 1, characterized in that: The siliceous mineral includes one or more of quartz, feldspar, kaolin and mullite; the particle size of the siliceous mineral is 250-300 meshes.

4. The fire-resistant gypsum board according to claim 1, characterized in that: The aluminum in the aluminum mineral is calculated as aluminum oxide, and the silicon in the siliceous mineral is calculated as silicon oxide. The mass ratio of the aluminum in the aluminum mineral to the silicon in the siliceous mineral is (2 to 2.55):

1.

5. The fire-resistant gypsum board according to claim 1, characterized in that: A transition layer is provided between the face paper and the first fire-resistant layer, between the first fire-resistant layer and the gypsum matrix, between the gypsum matrix and the second fire-resistant layer, and between the second fire-resistant layer and the face paper; The raw materials for preparing the transition layer are obtained by mixing the raw materials for preparing the refractory layer and the raw materials for preparing the gypsum matrix in a mass ratio of (1-2):

1.

6. The fire-resistant gypsum board according to claim 1, characterized in that: The thickness of the first fire-resistant layer is 0.5-2 mm, and the thickness of the second fire-resistant layer is 0.5-2 mm.

7. The fire-resistant gypsum board according to claim 5, characterized in that The thickness of the gypsum matrix is ​​8.0-12.0 mm; the thickness of the transition layer is 0.2-1 mm.

8. The method for preparing a fire-resistant gypsum board according to claim 1, comprising the following steps: A) mixing raw materials for preparing the refractory layer to obtain a refractory slurry, mixing raw materials for preparing the gypsum matrix to obtain a gypsum-based slurry, and mixing the refractory slurry and the gypsum-based slurry in a mass ratio of (1-2):1 to obtain a transition slurry; B) sequentially coating the surface of the face paper with a transition slurry, a refractory slurry and a transition slurry to obtain a treated face paper; C) coating a gypsum-based slurry between the transition layers of the two treated face papers, and drying the slurry after solidification to obtain a fire-resistant gypsum board.

9. The preparation method according to claim 8, characterized in that: The curing temperature in the step C) is 30-40° C., and the curing time in the step C) is 210-240 seconds.

10. The preparation method according to claim 8, characterized in that: The drying temperature in step C) is 110-320° C., and the drying time in step C) is 30-50 minutes.

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