Gypsum plaster board and production method thereof

Abstract

The invention discloses a gypsum plaster board and a production method thereof, and relates to the technical field of building materials. The composite board comprises backing paper, surface paper and a gypsum core body, the backing paper and the surface paper are tightly pressed on the surface of the gypsum core body, and waterproof paper is arranged on the faces, away from the gypsum core body, of the backing paper and the surface paper; according to the invention, the water-resistant paper is arranged on the backing paper and the surface paper, and the water-resistant paper is subjected to silicone oil infiltration treatment, so that the water resistance of the gypsum plaster board is improved; according to the gypsum slurry prepared by the process, the content of components of the gypsum slurry is accurately controlled, and the production and processing cost of the gypsum plaster board is reduced in the production and processing process of the gypsum plaster board; the gypsum slurry is prepared in a step-by-step manner, and each component is independently adjusted in the preparation process, so that the prepared gypsum slurry meets the production and processing of different types of gypsum plaster boards, the flexibility of the production and processing of the gypsum plaster boards is further improved, and meanwhile, the waste of raw materials is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a paper-faced gypsum board and a production method thereof. Background Art

[0002] Gypsum board is made of building gypsum as the main raw material, with appropriate amount of additives and fiber as the board core, and special paperboard as the surface. Gypsum board has the characteristics of light weight, sound insulation, heat insulation, strong processing performance and simple construction method. Gypsum board can be divided into four categories: ordinary, water-resistant, fire-resistant and moisture-proof; However, the gypsum board prepared by the prior art still has some defects: In the prior art, when preparing gypsum board, the raw materials of gypsum slurry are usually mixed by stirring as a whole, which makes it inconvenient to accurately control the components of the gypsum slurry. As a result, the gypsum slurry finally formed can only meet the production and processing of the same type of gypsum board, and cannot be used in other types of gypsum boards, thus resulting in a waste of raw materials. Meanwhile, conventional gypsum boards (except waterproof gypsum boards) prepared by the prior art do not have waterproof properties, and the production process of waterproof gypsum boards is complicated and the production cost is high, which results in poor waterproof properties of the conventional gypsum boards produced and processed; In the process of preparing gypsum board, a stirring device is usually required to prepare gypsum slurry. However, when the stirring device in the prior art stirs the raw materials required for preparing the gypsum slurry, the stirring method of the stirring device is relatively single, resulting in poor stirring effect of the raw materials, which in turn affects the quality of the gypsum slurry. At the same time, the stirring device needs to be cleaned regularly to remove the residual gypsum slurry inside it. However, the stirring device in the prior art is inconvenient to separate, which makes the cleaning operation of the stirring device relatively inconvenient. In view of the above problems, the inventors propose a gypsum board and a production method thereof to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the object of the present invention is to provide a paper-faced gypsum board and a production method thereof.

[0004] In order to solve the above technical problems, the present invention adopts the following technical scheme: a paper-faced gypsum board, which includes backing paper, face paper and a gypsum core, the backing paper and face paper are pressed tightly on the surface of the gypsum core, the backing paper and face paper are both provided with water-resistant paper on one side away from the gypsum core, the backing paper and face paper are both coated with an adhesive layer on one side away from the gypsum core, and the water-resistant paper is adhesively connected to the backing paper and face paper through the adhesive layer.

[0005] The present invention also provides a method for producing a paper-faced gypsum board, comprising the following steps: S1. First, raw materials for preparing gypsum slurry are added into a stirring device one by one, and the raw materials are stirred to obtain gypsum slurry; S2. Soak the water-resistant paper in silicone oil, then apply glue on the surface of the backing paper and the face paper, and then stick the water-resistant paper on the backing paper and the face paper respectively, and set aside after drying naturally; S3, unwinding the backing paper through an unwinding device, allowing the unwinding backing paper to pass through the conveyor belt of the molding machine, and then injecting gypsum slurry on the backing paper and distributing it evenly; S4, pressing the surface paper onto the gypsum slurry to obtain a wet board, then cutting the wet board according to the size required by production, and then conveying the cut wet board to a heating chamber to dehydrate and dry the wet board; S5. The wet board after dehydration and drying in S4 is transported to a packaging line, and the gypsum board is packaged by the packaging equipment on the packaging line, and then stored at room temperature in a warehouse.

[0006] Preferably, in S1, the specific preparation steps of the gypsum slurry are as follows: S11, firstly select gypsum material, send the gypsum material into a rotary kiln, calcine the gypsum material to obtain β-type hemihydrate gypsum, and cool it for standby use; S12, adding a water reducer, a retarder, a modified starch, paper pulp and water into a stirring device according to a set ratio, and uniformly stirring the water reducer, the retarder, the modified starch, paper pulp and water to obtain a raw material slurry for standby use; S13, adding the foaming agent and water into the stirring device according to the set ratio, stirring the foaming agent and water evenly, and obtaining a mixed slurry for standby use; S14, adding the semi-hydrated gypsum in S11 into a stirring device, and adding the raw material slurry in S12 and the mixed slurry in S13, stirring and mixing them evenly to obtain gypsum slurry.

[0007] Preferably, in S2, the soaking time of the water-resistant paper is 2-3 hours; In S3, the gypsum slurry is evenly distributed on the backing paper by the vibration of the molding machine; In S4, the drying temperature of the heating chamber is 70-80°C, and the drying time is 12-15h; In S12, the ratio of the water reducing agent, the retarder, the modified starch, the pulp and the water is 0.5:0.3:0.7:1:1.5; The ratio of the foaming agent to water is 1:2; The water reducer is any one of a polycarboxylic acid water reducer and a naphthalene water reducer; The retarder is any one of an organic retarder, an inorganic retarder and a composite retarder; The modified starch is any one of modified corn starch, modified cassava starch and modified potato starch; The foaming agent is any one of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate and sodium polyoxyethylene fatty alcohol ether sulfate; In S11, the gypsum material is any one of desulfurized gypsum material, natural gypsum material, phosphogypsum material and titanium gypsum material.

[0008] Preferably, the stirring device comprises a fixed frame, a stirring tank body is fixedly mounted in the middle of the fixed frame, a tank cover is provided at the open end of the stirring tank body, a stirring mechanism is provided on the tank cover, and a separation mechanism for separating the tank cover from the stirring tank body is provided on the fixed frame.

[0009] Preferably, a feeding hopper is fixedly arranged on the tank cover, a discharge pipe is fixedly arranged on the bottom of the stirring tank body, and four mounting frames distributed in a ring array are fixedly arranged on the bottom of the fixed frame.

[0010] Preferably, the stirring mechanism comprises a first stirring shaft and a second stirring shaft, one end of the first stirring shaft passes through the tank cover and is rotatably connected to the tank cover, a first stirring paddle is fixedly provided on the first stirring shaft, a second stirring paddle is fixedly provided on the second stirring shaft, a fixing frame is fixedly provided on the first stirring shaft, and one end of the second stirring shaft is rotatably connected to one end of the fixing frame; A first motor is fixedly arranged on the upper surface of the tank cover, a driving output end of the first motor is fixedly connected to one end of a first stirring shaft, a passive gear is fixedly arranged on one end of the second stirring shaft, an inner gear ring is fixedly arranged on the inner wall of the tank cover, and the passive gear is meshingly connected with the inner gear ring.

[0011] Preferably, the separation mechanism comprises a Z-shaped connecting frame, four of which are provided, one end of each of the four Z-shaped connecting frames is fixedly connected to the outer wall of the tank cover, four slide grooves distributed in a ring array are provided on the fixed frame, one end of each of the four slide grooves is slidably provided with a slider, and the other end of one of the Z-shaped connecting frames is fixedly connected to one side of a slider; Four lead screws distributed in a ring array are rotatably installed on the fixed frame, one of the lead screws passes through a slide groove and is rotatably connected to a slider thread, one end of the four lead screws is fixedly provided with a driven gear, an external gear ring is rotatably provided on the fixed frame, and the four driven gears are meshingly connected with the external gear ring.

[0012] Preferably, a circular slide rail is fixedly arranged on the fixed frame, and four arc blocks distributed in a ring array are slidably arranged on the circular slide rail, and the upper surfaces of the four arc blocks are fixedly connected to the lower surface of the outer gear ring.

[0013] Preferably, a second motor is fixedly provided on the outer wall of the stirring tank body, a rotating rod is fixedly provided on the driving output end of the second motor, a driving gear is fixedly provided on one end of the rotating rod, a plurality of teeth distributed in a ring array are fixedly provided on the inner ring of the outer gear ring, and the driving gear is meshingly connected with the teeth.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, water-resistant paper is arranged on the backing paper and the surface paper, and the water-resistant paper is treated by silicone oil infiltration, thereby improving the water resistance of the paper-faced gypsum board; 2. In the present invention, the gypsum slurry prepared by this process can accurately control the content of the gypsum slurry components, thereby reducing the production and processing costs of the gypsum board during the production and processing of the gypsum board; 3. In the present invention, the gypsum slurry is prepared in a step-by-step manner, and each component is adjusted separately during the preparation process, so that the prepared gypsum slurry meets the production and processing of different types of gypsum boards, thereby improving the flexibility of the production and processing of gypsum boards and avoiding the waste of raw materials; 4. In the present invention, the stirring mechanism is provided, and the first stirring paddle in the stirring mechanism stirs the raw materials in the central area of ​​the stirring tank body, and the second stirring paddle stirs the raw materials in the surrounding area of ​​the stirring tank body while revolving in a circle and rotating on its own, thereby improving the stirring effect of the raw materials, and further improving the quality of the prepared gypsum slurry; 5. In the present invention, the separation mechanism is set to drive the tank cover to separate from the stirring tank body, and the tank cover separates the stirring mechanism from the stirring tank body, allowing operators to clean the stirring mechanism and the inner cavity of the stirring tank body, thereby conveniently realizing the separation of the stirring mechanism and the tank cover from the stirring tank body, thereby effectively improving the convenience of cleaning the stirring mechanism and the inner cavity of the stirring tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The figure is a schematic diagram of the overall structure of a gypsum board according to the present invention.

[0017] Figure 2 The diagram is a schematic diagram of the explosion structure of a gypsum board according to the present invention.

[0018] Figure 3 For the present invention Figure 2A magnified schematic diagram of part A in FIG.

[0019] Figure 4 It is a schematic diagram of the overall structure of the stirring device of the present invention.

[0020] Figure 5 It is a schematic diagram of the separation of the tank cover and the stirring tank body of the present invention.

[0021] Figure 6 It is a schematic diagram of the cutaway structure of the tank cover and the stirring tank body of the present invention.

[0022] Figure 7 It is a structural schematic diagram of the stirring mechanism of the present invention.

[0023] Figure 8 It is a schematic diagram of the connection structure between the separation mechanism and the fixed frame of the present invention.

[0024] Fig. 9 For the present invention Figure 8 An enlarged schematic diagram of part B in FIG.

[0025] In the figure: 1, backing paper; 2, face paper; 3, gypsum core; 4, water-resistant paper; 5, adhesive layer; 6, fixed frame; 61, mixing tank body; 62, tank cover; 63, feeding hopper; 65, discharge pipe; 66, mounting frame; 7, stirring mechanism; 8, separation mechanism; 71, first stirring shaft; 72, first stirring paddle; 73, second stirring shaft; 74, second stirring paddle; 75, fixed frame; 76, first motor; 77, passive gear; 78, inner gear ring; 81, Z-type connecting frame; 82, slide groove; 83, slider; 84, lead screw; 85, driven gear; 86, outer gear ring; 87, circular slide rail; 88, arc block; 89, second motor; 9, rotating rod; 91, driving gear; 92, teeth. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in 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 creative work are within the scope of protection of the present invention.

[0027] Embodiment 1: Figure 1-9 As shown, the present invention provides a paper-faced gypsum board, which includes a backing paper 1, a face paper 2 and a gypsum core 3. The backing paper 1 and the face paper 2 are pressed tightly on the surface of the gypsum core 3, and a water-resistant paper 4 is provided on one side of the backing paper 1 and the face paper 2 away from the gypsum core 3. The backing paper 1 and the face paper 2 are coated with an adhesive layer 5 on one side away from the gypsum core 3, and the water-resistant paper 4 is adhesively connected to the backing paper 1 and the face paper 2 through the adhesive layer 5.

[0028] The present invention also provides a method for producing a paper-faced gypsum board, comprising the following steps: S1. First, a desulfurized gypsum material is selected, and the desulfurized gypsum material is sent into a rotary kiln, and the desulfurized gypsum material is calcined to obtain β-type semi-hydrated gypsum, which is cooled and set aside. According to a ratio of 0.5:0.3:0.7:1:1.5, a polycarboxylic acid water reducer, an organic retarder, a modified cassava starch, a pulp and water are added to a stirring device according to a set ratio, and the polycarboxylic acid water reducer, the organic retarder, the modified cassava starch, the pulp and the water are stirred evenly to obtain a raw material slurry for standby use. According to a ratio of 1:2, sodium dodecylbenzene sulfonate and water are added to a stirring device according to a set ratio, and the sodium dodecylbenzene sulfonate and water are stirred evenly to obtain a mixed slurry for standby use. The semi-hydrated gypsum is added to the stirring device, and the raw material slurry and the mixed slurry are added, and the raw material slurry and the mixed slurry are stirred and mixed evenly to obtain a gypsum slurry; S2, soak the water-resistant paper 4 in silicone oil for 2 hours, then apply glue on the surface of the backing paper 1 and the surface paper 2, and then stick the water-resistant paper 4 on the backing paper 1 and the surface paper 2 respectively, and set aside after drying naturally; S3, unwinding the backing paper 1 through an unwinding device, allowing the unwinding backing paper 1 to pass through a conveyor belt of a molding machine, and then injecting gypsum slurry on the backing paper 1, and evenly distributing the gypsum slurry on the backing paper 1 through the vibration of the molding machine; S4, pressing the face paper 2 onto the gypsum slurry to obtain a wet board, then cutting the wet board according to the size required for production, and then transporting the cut wet board to a heating chamber to dehydrate and dry the wet board. The drying temperature of the heating chamber is 70° C., and the drying time is 12 hours; S5. The wet board after dehydration and drying in S4 is transported to a packaging line, and the gypsum board is packaged by the packaging equipment on the packaging line, and then stored at room temperature in a warehouse.

[0029] The mixing device includes a fixed frame 6, a mixing tank body 61 is fixedly mounted in the middle of the fixed frame 6, a tank cover 62 is provided at the open end of the mixing tank body 61, a mixing mechanism 7 is provided on the tank cover 62, and a separation mechanism 8 for separating the tank cover 62 from the mixing tank body 61 is provided on the fixed frame 6. By setting the mixing mechanism 7, the mixing mechanism 7 can fully mix the raw materials for preparing gypsum slurry in the mixing tank body 61, thereby improving the quality of the formed gypsum slurry. By setting the separation mechanism 8, the separation mechanism 8 can separate the tank cover 62 from the mixing tank body 61, thereby separating the mixing mechanism 7 from the mixing tank body 61, thereby facilitating the operator to clean the inner cavity of the mixing mechanism 7 and the mixing tank body 61.

[0030] A feeding hopper 63 is fixedly provided on the tank cover 62, and a discharge pipe 65 is fixedly provided at the bottom of the mixing tank body 61. By providing the feeding hopper 63 and the discharge pipe 65, the feeding hopper 63 is used to add raw materials for preparing gypsum slurry, and the gypsum slurry formed in the mixing tank body 61 can be discharged outward through the discharge pipe 65. Four mounting frames 66 distributed in a ring array are fixedly provided at the bottom of the fixed frame 6. By providing the mounting frames 66, it is convenient for operators to assemble the fixed frame 6 and the mixing tank body 61 on the gypsum board production line.

[0031] The stirring mechanism 7 includes a first stirring shaft 71 and a second stirring shaft 73. One end of the first stirring shaft 71 passes through the tank cover 62 and is rotatably connected to the tank cover 62. A first stirring paddle 72 is fixedly provided on the first stirring shaft 71, and a second stirring paddle 74 is fixedly provided on the second stirring shaft 73. A fixing frame 75 is fixedly provided on the first stirring shaft 71. One end of the second stirring shaft 73 is rotatably connected to one end of the fixing frame 75. By driving the first stirring shaft 71 to rotate, the first stirring shaft 71 can rotate the first stirring paddle 72, and the first stirring paddle 72 can stir the raw materials in the central area of ​​the stirring tank body 61. By driving the second stirring shaft 73 to revolve in a circle and rotate synchronously, the second stirring shaft 73 can make the second stirring paddle 74 revolve in a circle and rotate synchronously, and the second stirring paddle 74 can stir the raw materials in the surrounding area of ​​the stirring tank body 61, thereby improving the stirring effect of the raw materials. By setting the fixing frame 75, the first stirring shaft 71 can make the second stirring shaft 73 and the second stirring paddle 74 revolve in a circle through the fixing frame 75. A first motor 76 is fixedly provided on the upper surface of the tank cover 62, and a driving output end of the first motor 76 is fixedly connected to one end of the first stirring shaft 71, a driven gear 77 is fixedly provided at one end of the second stirring shaft 73, and an inner gear ring 78 is fixedly provided on the inner wall of the tank cover 62, and the driven gear 77 is meshingly connected with the inner gear ring 78. By turning on the first motor 76, the driving shaft of the first motor 76 can rotate the first stirring shaft 71. By setting the driven gear 77 and the inner gear ring 78, when the second stirring shaft 73 revolves in a circle, the driven gear 77 revolves synchronously in a circle, and under the action of the inner gear ring 78, the driven gear 77 rotates on its own, and the driven gear 77 can rotate the second stirring shaft 73.

[0032] The separation mechanism 8 includes a Z-shaped connecting frame 81, four Z-shaped connecting frames 81 are provided, one end of the four Z-shaped connecting frames 81 is fixedly connected to the outer wall of the tank cover 62, and by driving the Z-shaped connecting frame 81 to rise and fall vertically, the Z-shaped connecting frame 81 can make the tank cover 62 rise and fall synchronously, and the fixed frame 6 is provided with four slide grooves 82 distributed in a ring array, and one end of the four slide grooves 82 is slidably provided with a slider 83, and the other end of one Z-shaped connecting frame 81 is fixedly connected to one side of a slider 83, and by driving the slider 83 to slide vertically in the slide groove 82, the slider 83 can make the Z-shaped connecting frame 81 rise and fall vertically; Four lead screws 84 distributed in a ring array are rotatably installed on the fixed frame 6, one of the lead screws 84 passes through a slide groove 82 and is threadedly rotatably connected to a slider 83, one end of the four lead screws 84 is fixedly provided with a driven gear 85, an outer gear ring 86 is rotatably provided on the fixed frame 6, the four driven gears 85 are meshingly connected with the outer gear ring 86, by driving the outer gear ring 86 to rotate, the outer gear ring 86 can drive the driven gear 85 to rotate, the driven gear 85 can rotate the lead screw 84, and the lead screw 84 can drive the slider 83 to rise and fall vertically in the slide groove 82.

[0033] A circular slide rail 87 is fixedly provided on the fixed frame 6, and four arc blocks 88 distributed in a ring array are slidably provided on the circular slide rail 87. The upper surfaces of the four arc blocks 88 are fixedly connected to the lower surface of the outer gear ring 86. By providing the circular slide rail 87 and the arc blocks 88, the stability of the outer gear ring 86 during rotation can be improved.

[0034] A second motor 89 is fixedly provided on the outer wall of the stirring tank body 61, a rotating rod 9 is fixedly provided on the driving output end of the second motor 89, a driving gear 91 is fixedly provided on one end of the rotating rod 9, a plurality of teeth 92 distributed in a ring array are fixedly provided on the inner ring of the outer gear ring 86, the driving gear 91 is meshingly connected with the teeth 92, by turning on the second motor 89, the driving shaft of the second motor 89 can rotate the driving gear 91 through the rotating rod 9, and the driving gear 91 can rotate the outer gear ring 86 through the teeth 92.

[0035] Embodiment 2: The present invention also provides a method for producing a gypsum board, comprising the following steps: S1, first select phosphogypsum material, send the phosphogypsum material into a rotary kiln, calcine the phosphogypsum material to obtain β-type semi-hydrated gypsum, cool it for standby use, add naphthalene-based water reducer, composite retarder, modified potato starch, pulp and water to a stirring device according to a set ratio at a ratio of 0.5:0.3:0.7:1:1.5, stir the naphthalene-based water reducer, composite retarder, modified potato starch, pulp and water to obtain a raw material slurry for standby use, add sodium dodecylbenzene sulfonate and water to a stirring device according to a set ratio at a ratio of 1:2, stir fatty alcohol polyoxyethylene ether sodium sulfate and water to obtain a mixed slurry for standby use, add semi-hydrated gypsum to a stirring device, add the raw material slurry and the mixed slurry, stir and mix them to obtain a gypsum slurry; S2, soak the water-resistant paper 4 in silicone oil for 3 hours, then apply glue on the surface of the backing paper 1 and the surface paper 2, and then stick the water-resistant paper 4 on the backing paper 1 and the surface paper 2 respectively, and set aside after drying naturally; S3, unwinding the backing paper 1 through an unwinding device, allowing the unwinding backing paper 1 to pass through a conveyor belt of a molding machine, and then injecting gypsum slurry on the backing paper 1, and evenly distributing the gypsum slurry on the backing paper 1 through the vibration of the molding machine; S4, pressing the face paper 2 onto the gypsum slurry to obtain a wet board, then cutting the wet board according to the size required for production, and then transporting the cut wet board to a heating chamber to dehydrate and dry the wet board. The drying temperature of the heating chamber is 75° C., and the drying time is 15 hours; S5. The wet board after dehydration and drying in S4 is transported to a packaging line, and the gypsum board is packaged by the packaging equipment on the packaging line, and then stored at room temperature in a warehouse.

[0036] Working principle: when it is necessary to prepare gypsum slurry, the operator first adds the raw materials required for preparing gypsum slurry into the mixing tank body 61 through the feeding hopper 63, and then turns on the first motor 76. The driving shaft of the first motor 76 rotates the first stirring shaft 71, and the first stirring shaft 71 rotates the first stirring paddle 72. The first stirring paddle 72 stirs the raw materials in the central area of ​​the mixing tank body 61. At the same time, the first stirring shaft 71 causes the second stirring shaft 73, the driven gear 77 and the second stirring paddle 74 to revolve in a circle through the fixing frame 75. The driven gear 77 rotates the second stirring shaft 73, and the second stirring shaft 73 causes the second stirring paddle 74 to revolve in a circle and rotate on its own synchronously. The second stirring paddle 74 stirs the raw materials in the surrounding area of ​​the mixing tank body 61. The first stirring paddle 72 and the second stirring paddle 74 fully stir the raw materials in the mixing tank body 61, thereby improving the stirring effect of the raw materials, and then improving the quality of the prepared gypsum slurry. When cleaning operation is required, the operator first turns on the second motor 89, and the driving shaft of the second motor 89 rotates the driving gear 91 through the rotating rod 9, and the driving gear 91 rotates the outer gear ring 86 through the teeth 92, and the outer gear ring 86 drives the four driven gears 85 to rotate, and the four driven gears 85 rotate the four lead screws 84, and the four lead screws 84 drive the four sliders 83 to rise vertically in the corresponding slide grooves 82, and the four sliders 83 make the tank cover 62 rise and fall synchronously through the four Z-shaped connecting frames 81 until the four sliders 83 slide upward to the top of the corresponding slide grooves 82 and then turn off the second motor 89. At this time, the tank cover 62 and the stirring mechanism 7 are separated from the stirring tank body 61, so that the operator can clean the inner cavity of the stirring mechanism 7 and the stirring tank body 61, thereby conveniently realizing the separation of the stirring mechanism 7 and the tank cover 62 from the stirring tank body 61, thereby effectively improving the convenience of cleaning the inner cavity of the stirring mechanism 7 and the stirring tank body 61.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A gypsum board, characterized in that: The paper-faced gypsum board comprises a backing paper (1), a face paper (2) and a gypsum core (3); the backing paper (1) and the face paper (2) are pressed tightly against the surface of the gypsum core (3); a water-resistant paper (4) is provided on one side of the backing paper (1) and the face paper (2) away from the gypsum core (3); a glue layer (5) is coated on one side of the backing paper (1) and the face paper (2) away from the gypsum core (3); and the water-resistant paper (4) is adhesively connected to the backing paper (1) and the face paper (2) via the glue layer (5).

2. A method for producing the gypsum board according to claim 1, characterized in that: The following steps are involved: S1. First, raw materials for preparing gypsum slurry are added into a stirring device one by one, and the raw materials are stirred to obtain gypsum slurry; S2, soaking the water-resistant paper (4) in silicone oil, then applying glue on the surface of the backing paper (1) and the face paper (2), and then pasting the water-resistant paper (4) on the backing paper (1) and the face paper (2) respectively, and setting aside for use after drying naturally; S3, unwinding the backing paper (1) through an unwinding device, allowing the unwinding backing paper (1) to pass through a conveyor belt of a molding machine, and then injecting gypsum slurry onto the backing paper (1) and distributing it evenly; S4, pressing the face paper (2) onto the gypsum slurry to obtain a wet board, then cutting the wet board according to the size required by production, and then conveying the cut wet board to a heating chamber to dehydrate and dry the wet board; S5. The wet board after dehydration and drying in S4 is transported to a packaging line, and the gypsum board is packaged by the packaging equipment on the packaging line, and then stored at room temperature in a warehouse.

3. The method for producing a gypsum board according to claim 2, characterized in that: In S1, the specific preparation steps of the gypsum slurry are as follows: S11, firstly select gypsum material, send the gypsum material into a rotary kiln, calcine the gypsum material to obtain β-type hemihydrate gypsum, and cool it for standby use; S12, adding a water reducer, a retarder, a modified starch, paper pulp and water into a stirring device according to a set ratio, and stirring the water reducer, the retarder, the modified starch, paper pulp and water uniformly to obtain a raw material slurry for standby use; S13, adding the foaming agent and water into the stirring device according to the set ratio, stirring the foaming agent and water evenly, and obtaining a mixed slurry for standby use; S14, adding the semi-hydrated gypsum in S11 into a stirring device, and adding the raw material slurry in S12 and the mixed slurry in S13, stirring and mixing them evenly to obtain gypsum slurry.

4. A method for producing a gypsum board according to claim 3, characterized in that: In S2, the water-resistant paper (4) is soaked for 2-3 hours. In S3, the gypsum slurry is evenly distributed on the backing paper (1) by the vibration of the molding machine. In S4, the drying temperature of the heating chamber is 70-80° C. and the drying time is 12-15 hours. The ratio of the water reducing agent, retarder, modified starch, pulp and water is 0.5:0.3:0.7:1:1.5; In S13, the ratio of the foaming agent to water is 1:2; The water reducer is any one of a polycarboxylic acid water reducer and a naphthalene water reducer; The retarder is any one of an organic retarder, an inorganic retarder and a composite retarder; The modified starch is any one of modified corn starch, modified cassava starch and modified potato starch; The foaming agent is any one of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate and sodium fatty alcohol polyoxyethylene ether sulfate; The gypsum material is any one of desulfurized gypsum material, natural gypsum material, phosphogypsum material and titanium gypsum material.

5. The method for producing a gypsum board according to claim 2, characterized in that: The stirring device comprises a fixed frame (6), a stirring tank body (61) is fixedly mounted in the middle of the fixed frame (6), a tank cover (62) is provided at the open end of the stirring tank body (61), a stirring mechanism (7) is provided on the tank cover (62), and a separation mechanism (8) for separating the tank cover (62) from the stirring tank body (61) is provided on the fixed frame (6).

6. A method for producing a gypsum board according to claim 5, characterized in that: A feeding hopper (63) is fixedly arranged on the tank cover (62), a discharge pipe (65) is fixedly arranged on the bottom of the stirring tank body (61), and four mounting frames (66) distributed in a ring array are fixedly arranged on the bottom of the fixed frame (6).

7. The method for producing a gypsum board according to claim 5, characterized in that: The stirring mechanism (7) comprises a first stirring shaft (71) and a second stirring shaft (73); one end of the first stirring shaft (71) passes through the tank cover (62) and is rotatably connected to the tank cover (62); a first stirring paddle (72) is fixedly arranged on the first stirring shaft (71); a second stirring paddle (74) is fixedly arranged on the second stirring shaft (73); a fixing frame (75) is fixedly arranged on the first stirring shaft (71); and one end of the second stirring shaft (73) is rotatably connected to one end of the fixing frame (75); A first motor (76) is fixedly disposed on the upper surface of the tank cover (62); a driving output end of the first motor (76) is fixedly connected to one end of a first stirring shaft (71); a driven gear (77) is fixedly disposed on one end of the second stirring shaft (73); an inner gear ring (78) is fixedly disposed on the inner wall of the tank cover (62); and the driven gear (77) is meshingly connected to the inner gear ring (78).

8. The method for producing a gypsum board according to claim 5, characterized in that: The separation mechanism (8) comprises a Z-shaped connecting frame (81), wherein four Z-shaped connecting frames (81) are provided, one end of each of the four Z-shaped connecting frames (81) is fixedly connected to the outer wall of the tank cover (62), the fixed frame (6) is provided with four slide grooves (82) distributed in a ring array, one end of each of the four slide grooves (82) is slidably provided with a slider (83), and the other end of one of the Z-shaped connecting frames (81) is fixedly connected to one side of a slider (83); Four lead screws (84) distributed in a ring array are rotatably mounted on the fixed frame (6), one of the lead screws (84) passes through a slide groove (82) and is threadedly rotatably connected to a slider (83), one end of each of the four lead screws (84) is fixedly provided with a driven gear (85), an external gear ring (86) is rotatably provided on the fixed frame (6), and the four driven gears (85) are meshingly connected with the external gear ring (86).

9. A method for producing a gypsum board according to claim 8, characterized in that: A circular slide rail (87) is fixedly arranged on the fixed frame (6), and four arc-shaped blocks (88) distributed in a ring array are slidably arranged on the circular slide rail (87), and the upper surfaces of the four arc-shaped blocks (88) are fixedly connected to the lower surface of the outer gear ring (86).

10. The method for producing a gypsum board according to claim 8, characterized in that: A second motor (89) is fixedly disposed on the outer wall of the stirring tank body (61); a rotating rod (9) is fixedly disposed on the driving output end of the second motor (89); a driving gear (91) is fixedly disposed on one end of the rotating rod (9); a plurality of teeth (92) distributed in a ring-shaped array are fixedly disposed on the inner ring of the outer gear ring (86); and the driving gear (91) is meshingly connected with the teeth (92).

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