A precast GAG sound-absorbing gypsum board and its preparation method

Abstract

This invention discloses a precast GAG sound-absorbing gypsum board and its preparation method. The gypsum board has a first surface and a second surface arranged opposite to each other; and a plurality of sound-absorbing wedges protruding from the first surface of the gypsum board. The gypsum board has a plurality of conical sound-absorbing holes and a plurality of metal rods inside. The conical sound-absorbing holes penetrate the first surface and the second surface perpendicularly, and the metal rods are parallel to the first surface and the second surface. The conical sound-absorbing holes and the metal rods do not intersect. The board has a high porosity, good sound absorption effect, high mechanical strength, and wide applicability.

Description

Technical Field

[0001] This invention relates to the field of sound-absorbing materials technology, and in particular to a precast GAG sound-absorbing gypsum board and its preparation method. Background Technology

[0002] People often need quiet environments in their lives and work, such as recording studios, operating rooms, sanatoriums, libraries, and hospital wards. However, noise is ubiquitous; traffic noise on the roads, noise from airplanes in the sky, the hum of indoor air conditioning fans, and the voices of patients in hospital waiting rooms all erode quiet environments. Therefore, people need sound-absorbing materials, such as sound-absorbing panels, to control noise and keep it within acceptable limits.

[0003] In related technologies, the openings in inorganic materials such as paper-faced gypsum board are often used to achieve noise reduction. The current conventional method is to use stamping equipment to punch out the board, with an opening ratio of generally 1-5%. If the opening ratio is greater than 5%, the strength of the board will decrease significantly, making it prone to breakage and unfavorable for processing, handling, and construction. If other rigid materials such as metal are used instead, they cannot be suitable for all spaces, such as hospital wards. Therefore, inorganic materials with breathing function have a wider range of applications.

[0004] Therefore, there is an urgent need to develop a type of sheet material with high porosity, high mechanical strength, and breathable properties. Summary of the Invention

[0005] In view of this, this application provides a precast GAG sound-absorbing gypsum board and its preparation method, which has high porosity, good sound absorption effect, high mechanical strength and wide applicability.

[0006] To achieve the above technical objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a precast GAG sound-absorbing gypsum board, comprising:

[0008] The gypsum board body has a first surface and a second surface disposed opposite to each other; and

[0009] Multiple sound-absorbing wedges are protruding from the first surface of the gypsum board;

[0010] The gypsum board has multiple conical sound-absorbing holes and multiple metal rods inside. The conical sound-absorbing holes penetrate vertically through the first surface and the second surface, and the metal rods are parallel to the first surface and the second surface. The conical sound-absorbing holes and the metal rods do not intersect.

[0011] Preferably, the second surface is covered with a fiberglass wall covering.

[0012] Preferably, the longitudinal section of the tapered sound-absorbing hole is an isosceles trapezoid, and the diameter of the tapered sound-absorbing hole on the first surface is larger than the diameter of the hole on the second surface.

[0013] Preferably, the sound-absorbing wedge is an equilateral tetrahedral cone, and the sound-absorbing wedges are connected in pairs.

[0014] Preferably, the conical sound-absorbing holes are evenly distributed within the gypsum board, and the porosity of the first surface of the gypsum board is greater than or equal to 28.26%, and the porosity of the second surface of the gypsum board is greater than or equal to 9.6%.

[0015] Preferably, the tapered sound-absorbing holes are arranged in a matrix.

[0016] Secondly, this application provides a method for preparing precast GAG sound-absorbing gypsum board, comprising the following steps:

[0017] S1. Silicone mold for making precast GAG sound-absorbing gypsum board;

[0018] S2. Inject the inorganic slurry into the silicone mold, then place the metal rod evenly in the inorganic slurry, and then use a scraper to level the inorganic slurry to obtain the board to be solidified;

[0019] S3. Adhere the fiberglass wall covering to the surface of the board to be set, let it stand until the inorganic slurry has completed its initial setting, and then demold to obtain the initial set board.

[0020] S4. Dry the initial set board, then grind and fix the thickness to obtain the precast GAG sound-absorbing gypsum board.

[0021] Preferably, after the sanding and thickness setting steps, the material is further coated with a water-based paint.

[0022] Preferably, the inorganic slurry comprises the following components in parts by weight: 90-110 parts of Alpha high-strength gypsum powder, 20-25 parts of white cement, 5-8 parts of chopped glass fiber, 3-5 parts of redispersible latex powder, 3-5 parts of waterproofing agent, and 200-220 parts of water.

[0023] Preferably, step S1 includes the following steps:

[0024] S11. Evenly distributed conical sound-absorbing holes are made on the wood board, and continuous sound-absorbing wedges are set on one side of the wood board at the non-hole position to obtain a sound-absorbing wood board. Then, the sound-absorbing wood board is used as the master board to make an aluminum mold.

[0025] S12. Make a mold of the same shape on the outside of the aluminum mold, and inject silicone raw material between the aluminum mold and the mold to obtain the silicone mold.

[0026] The beneficial effects of this application are as follows:

[0027] This application differs from grooving or punching on the surface of inorganic boards, and also from punching holes in metal boards. It adopts a mold-casting method, using a combination of various inorganic and metal materials to achieve a large porosity and good sound absorption effect without affecting the strength of the board. The front surface of the precast GAG sound-absorbing gypsum board of this application is designed with sound-absorbing wedges. The uneven surface formed by the sound-absorbing wedges absorbs sound waves, changes the path of sound rays, and forms diffuse reflection of reflected sound waves, thus improving the standing wave phenomenon. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of precast GAG sound-absorbing gypsum board;

[0029] Figure 2 This is the front view of the first surface;

[0030] Figure 3 This is the front view of the second surface;

[0031] Figure 4 This is a schematic diagram of the cross-section of the sound-absorbing wedge;

[0032] Figure 5 A top view of the sound-absorbing wedge;

[0033] Figure 6 This is a cross-sectional view of fiberglass wall covering.

[0034] In the diagram: 1. Sound-absorbing wedge; 2. Conical sound-absorbing hole; 3. Metal rod; 4. Gypsum board body; 5. First surface; 6. Second surface; 7. Fiberglass wall covering. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Terminology Explanation: GAG sound-absorbing gypsum board stands for Glass fibre cloth and Aluminus rod reinforced sound-absorbing Gypsum, which is a Class A non-combustible sound-absorbing gypsum board reinforced with glass fiber cloth and aluminum rod.

[0039] The following detailed implementation method further illustrates this solution.

[0040] Example 1

[0041] like Figure 1 As shown, a precast GAG sound-absorbing gypsum board includes: a gypsum board body 4 having a first surface 5 and a second surface 6 arranged opposite to each other, and a plurality of sound-absorbing wedges 1 protruding from the first surface 5 of the gypsum board body 4; wherein, the gypsum board body 4 is provided with a plurality of conical sound-absorbing holes 2 and a plurality of metal rods 3 inside, the conical sound-absorbing holes 2 simultaneously penetrate vertically through the first surface 5 and the second surface 6, the metal rods 3 simultaneously run parallel to the first surface 5 and the second surface 6, and the conical sound-absorbing holes 2 and the metal rods 3 do not intersect.

[0042] In this embodiment, the precast GAG sound-absorbing gypsum board features conical sound-absorbing holes 2 and sound-absorbing wedges 1, all absorbing sound waves in the same direction. The conical sound-absorbing holes 2 facilitate demolding, and the sound waves are reflected and silenced within the conical holes. The uneven surface formed by the sound-absorbing wedges absorbs the sound waves, alters the sound path, and diffuses the reflected sound waves, improving the standing wave phenomenon and enhancing the silencing effect. Simultaneously, the precast GAG sound-absorbing gypsum board in this embodiment also utilizes metal rods 3 and fiberglass wall coverings 7 to enhance the board's mechanical strength. This precast GAG sound-absorbing gypsum board achieves a porosity of at least 28.26% on the first surface 5 of the gypsum board body 4 and at least 9.6% on the second surface 6, exhibiting a high porosity with minimal change in mechanical strength. Furthermore, due to the composite of inorganic board and metal materials, it also possesses a breathable function, making it suitable for environments such as hospital wards.

[0043] The second surface 6 is covered with a fiberglass wall covering 7, the structure of which is as follows: Figure 6As shown, in this embodiment, the fiberglass wall covering 7 serves three functions: 1. To shield the conical sound-absorbing holes 2, preventing the back of the board from being seen through the conical sound-absorbing holes 2; 2. To prevent dust from falling; 3. The fiberglass wall covering and inorganic materials are precisely composited together, further enhancing the strength and toughness of the materials.

[0044] The longitudinal section of the conical sound-absorbing hole 2 is an isosceles trapezoid, and the diameter of the conical sound-absorbing hole 2 on the first surface 5 is larger than the diameter of the hole on the second surface 6. The conical sound-absorbing holes 2 are distributed in a matrix. Figure 2 This is a front view of the first surface 5, showing the distribution of the tapered sound-absorbing holes 2 on the first surface 5 of the gypsum board body 4. Figure 3 The front view of the second surface 6 shows the distribution of the conical sound-absorbing holes 2 on the second surface 6 of the gypsum board. The conical sound-absorbing holes 2 set in the above manner have a large opening ratio on the first surface 5 and a small opening ratio on the second surface 6, which is beneficial for demolding. If the diameter of the conical sound-absorbing holes 2 on the first surface 5 is smaller than the diameter of the holes on the second surface 6, demolding will not be possible.

[0045] The sound-absorbing wedge 1 is an equilateral tetrahedral cone. A schematic diagram of the cross-section of the sound-absorbing wedge 1 is shown below. Figure 4 As shown, the sound-absorbing wedges are connected in pairs to form a sheet, as shown in the top view. Figure 5 As shown, the sound-absorbing wedge 1 is positioned on the first surface 5 of the gypsum board body 4 at a non-perforated location. The uneven surface formed by the sound-absorbing wedge absorbs sound waves, changes the path of the sound rays, and forms diffuse reflection of the reflected sound waves, thus improving the standing wave phenomenon.

[0046] Example 2

[0047] A precast GAG sound-absorbing gypsum board, the preparation method of which includes the following steps:

[0048] S1. Making a silicone mold for precast GAG sound-absorbing gypsum board: S11. Evenly distributed conical sound-absorbing holes 2 are made on the wooden board. The cross-section of the conical sound-absorbing holes 2 is an isosceles trapezoid. Continuous sound-absorbing wedges 1 are set on one side of the wooden board at the non-hole position. Each sound-absorbing wedge 1 is an equilateral tetrahedron, in the shape of a pyramid, thus obtaining the sound-absorbing board. Then, the sound-absorbing board is used as the master template to make an aluminum mold; S12. Outside the aluminum mold, a mold of the same shape is made. Silicone raw material is injected between the aluminum mold and the mold to obtain the silicone mold;

[0049] S2. Prepare the inorganic slurry, which includes the following components by mass: 90-110 parts of Alpha high-strength gypsum powder, 20-25 parts of white cement, 5-8 parts of chopped glass fiber, 3-5 parts of redispersible latex powder, 3-5 parts of waterproofing agent, and 200-220 parts of water. Place the silicone mold on a vibrating table, pour the inorganic slurry, which has been uniformly mixed by a high-speed mixer, into the silicone mold, start the vibrating table to fully homogenize the inorganic slurry, and at the same time, the vibration also eliminates the air bubbles brought by high-speed mixing, further improving the density of the material. Then, place the metal rod 3 evenly in the inorganic slurry to prevent the board from deforming after molding. The metal rod 3 is placed between the sound-absorbing holes to strengthen the skeleton. Finally, use a scraper to level the inorganic slurry to obtain the board to be set.

[0050] S3. Cut the fiberglass wall covering 7 into the required size of the board, paste the fiberglass wall covering 7 onto the surface of the board to be set, let it stand until the inorganic slurry has completed its initial setting, and then demold to obtain the initial set board.

[0051] S4. The pre-cured board is dried, then sanded and the thickness is fixed. It is then fed into a continuous spraying machine to spray water-based paint on the surface of the board to eliminate color difference and cover casting defects. Using the above method, a Class A non-combustible sound-absorbing board made of composite inorganic and metal materials is finally obtained, which is the precast GAG sound-absorbing gypsum board of this embodiment 1.

[0052] Example 3

[0053] A precast GAG sound-absorbing gypsum board, the preparation method of which includes the following steps:

[0054] S1. Fabrication of a silicone mold for precast GAG sound-absorbing gypsum board: S11. 900 evenly distributed, matrix-shaped conical sound-absorbing holes 2 are made on a 600cm × 600cm wooden board. The cross-section of each conical sound-absorbing hole 2 is an isosceles trapezoid, with an upper base of 7mm, a lower base of 12mm, and a height of 12mm. Calculations show that the porosity of the first surface 5 is 3.14. 6 6 900 / 600 600 = 28.26%, the porosity of the second surface 6 is 3.14. 3.5 3.5 900 / 600 600 = 9.6%; On one side of the wooden board, at a non-perforated position, a continuous sound-absorbing wedge 1 is set. Each sound-absorbing wedge 1 is an equilateral tetrahedron with a base length of about 2mm and a height of 2mm, forming a pyramid shape, thus obtaining a sound-absorbing board. Then, the sound-absorbing board is used as a master template to make an aluminum mold; S12. Outside the aluminum mold, a mold of the same shape is made. Silicone raw material is injected between the aluminum mold and the mold to obtain a silicone mold;

[0055] S2. Prepare the inorganic slurry, which includes the following components in parts by weight: 90-110 parts of Alpha high-strength gypsum powder, 20-25 parts of white cement, 5-8 parts of chopped glass fiber, 3-5 parts of redispersible latex powder, 3-5 parts of waterproofing agent, and 200-220 parts of water. Place the silicone mold on a vibrating table, pour the inorganic slurry, which has been uniformly mixed by a high-speed mixer, into the silicone mold, start the vibrating table to fully homogenize the inorganic slurry, and at the same time, the vibration also eliminates the air bubbles brought by high-speed mixing, further improving the density of the material. Then, evenly place a 600cm metal aluminum rod in the inorganic slurry to prevent the board from deforming after molding. The metal aluminum rod is placed between the sound-absorbing holes to strengthen the skeleton. Finally, use a scraper to level the inorganic slurry to obtain the board to be set.

[0056] S3. Cut the fiberglass wall covering 7 into the required size of the board, paste the fiberglass wall covering 7 onto the surface of the board to be set, let it stand for 15 minutes to allow the inorganic slurry to complete the initial setting, and then demold to obtain the initial set board.

[0057] S4. The pre-cured board is dried at 150°C for 6 minutes to obtain a fully dried semi-finished board with a moisture content of no more than 5%. Then, it is sanded, the thickness is fixed to 16mm, and it is fed into a continuous spraying machine to spray water-based paint on the surface of the board to eliminate color difference and cover casting defects. Using the above method, a Class A non-combustible sound-absorbing board made of composite inorganic materials and metal materials is finally obtained, which is the precast GAG sound-absorbing gypsum board of Example 1.

[0058] Comparative Example 1

[0059] A precast GAG sound-absorbing gypsum board, the preparation method of which is as follows:

[0060] Prepare an inorganic slurry comprising the following components by weight: 90-110 parts of Alpha high-strength gypsum powder, 20-25 parts of white cement, 5-8 parts of chopped glass fiber, 3-5 parts of redispersible latex powder, 3-5 parts of waterproofing agent, and 200-220 parts of water. Pour the inorganic slurry into a rectangular mold to obtain a solid rectangular gypsum board. Use a stamping device to punch holes in the gypsum board, with a punching rate of 5%.

[0061] Comparative Example 2

[0062] A precast GAG sound-absorbing gypsum board is prepared in the same way as in Example 3, except that it does not contain glass fiber wall covering 7 and metal aluminum rod.

[0063] Comparative Example 3

[0064] A precast GAG sound-absorbing gypsum board is prepared in the same way as in Example 3, except that no aluminum rods are added.

[0065] Comparative Example 4

[0066] A precast GAG sound-absorbing gypsum board is prepared in the same way as in Example 3, except that glass fiber wall covering 7 is not added.

[0067] Evaluation Test

[0068] The fracture load of the precast GAG sound-absorbing gypsum boards of Example 3 and Comparative Examples 1-4 was tested according to the standard test method of ASTM E1820-17a for fracture toughness measurement. The moisture deflection of the precast GAG sound-absorbing gypsum boards of Example 3 and Comparative Examples 1-4 was measured using an ND-600 gypsum moisture deflection tester by Rongjida Instruments. The results are shown in Table 1.

[0069] Table 1 Test Results

[0070]

[0071] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A precast GAG sound-absorbing gypsum board, characterized in that, include: The gypsum board body (4) has a first surface (5) and a second surface (6) arranged opposite to each other; as well as Multiple sound-absorbing wedges (1) are protruding from the first surface (5) of the gypsum board body (4); The gypsum board body (4) is provided with multiple conical sound-absorbing holes (2) and multiple metal rods (3) inside. The conical sound-absorbing holes (2) penetrate vertically through the first surface (5) and the second surface (6) at the same time. The metal rods (3) are parallel to the first surface (5) and the second surface (6) at the same time. The conical sound-absorbing holes (2) and the metal rods (3) do not intersect. The second surface (6) is covered with glass fiber wall covering (7).

2. The precast GAG sound-absorbing gypsum board according to claim 1, characterized in that, The longitudinal section of the tapered sound-absorbing hole (2) is an isosceles trapezoid, and the diameter of the tapered sound-absorbing hole (2) on the first surface (5) is larger than the diameter of the hole on the second surface (6).

3. The precast GAG sound-absorbing gypsum board according to claim 1, characterized in that, The sound-absorbing wedge (1) is an equilateral tetrahedral cone, and the sound-absorbing wedges (1) are connected in pairs.

4. The precast GAG sound-absorbing gypsum board according to claim 1, characterized in that, The conical sound-absorbing holes (2) are evenly distributed within the gypsum board body (4), and the porosity of the first surface (5) of the gypsum board body (4) is greater than or equal to 28.26%, and the porosity of the second surface (6) of the gypsum board body (4) is greater than or equal to 9.6%.

5. The precast GAG sound-absorbing gypsum board according to claim 1, characterized in that, The conical sound-absorbing holes (2) are distributed in a matrix.

6. A method for preparing precast GAG sound-absorbing gypsum board as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Silicone mold for making precast GAG sound-absorbing gypsum board; S2. Inject the inorganic slurry into the silicone mold, then place the metal rod (3) evenly in the inorganic slurry, and then use a scraper to level the inorganic slurry to obtain the board to be solidified; S3. Adhere the fiberglass wall covering (7) to the surface of the board to be set, let it stand until the inorganic slurry has completed its initial setting, and then demold to obtain the initial set board; S4. The pre-set board is dried, then polished and the thickness is fixed to obtain the precast GAG sound-absorbing gypsum board.

7. The method for preparing precast GAG sound-absorbing gypsum board according to claim 6, characterized in that, After the sanding and thickness setting steps, water-based coatings are also sprayed onto the surface of the board.

8. The method for preparing precast GAG sound-absorbing gypsum board according to claim 6, characterized in that, The inorganic slurry comprises the following components in parts by weight: 90-110 parts of Alpha high-strength gypsum powder, 20-25 parts of white cement, 5-8 parts of chopped glass fiber, 3-5 parts of redispersible latex powder, 3-5 parts of waterproofing agent, and 200-220 parts of water.

9. The method for preparing precast GAG sound-absorbing gypsum board according to claim 6, characterized in that, Step S1 includes the following steps: S11. Evenly distributed conical sound-absorbing holes (2) are opened on the wood board, and continuous sound-absorbing wedges (1) are set on one side of the wood board at the non-hole position to obtain a sound-absorbing wood board. Then, the sound-absorbing wood board is used as a master to make an aluminum mold. S12. On the outside of the aluminum mold, a mold of the same shape is made, and silicone raw material is injected between the aluminum mold and the mold to obtain the silicone mold.

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