Sound-absorbing board and preparation method thereof

Abstract

The present invention relates to the technical field of building materials, and discloses a sound-absorbing board, which comprises the following raw materials, based on 100 parts by mass: 20-30 parts of granular cotton, 10-15 parts of perlite, 1-10 parts of waste paper, 1-10 parts of adhesive, 0.1-1 parts of glass fiber, 0.1-2 parts of moisture-proof agent, and the remainder of water; the preparation method of the sound-absorbing board is as follows: granular cotton, perlite, and waste paper are taken, water is added to each of them, and stirred until they become a paste, and then mixed and stirred with the moisture-proof agent, adhesive, and glass fiber to obtain a mixed slurry; the mixed slurry is flowed into a forming mesh bed for forming, and after vacuum water absorption and roller pressing and shaping, it is cut to obtain a formed wet-wool board; the formed wet-wool board is dried and dehydrated, and then putty and paint are scraped on it in sequence, and the burrs are removed after drying to obtain the sound-absorbing board. The sound-absorbing board of the present invention has a low density, good heat preservation and sound absorption and noise reduction effects, combustion performance reaches Class A standards, and formaldehyde emission is low, which has extremely low harm to human health. In addition, the sound-absorbing board has high bending resistance and strength, and can withstand large loads and stresses.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, in particular to a sound absorbing board and a preparation method thereof. Background Art

[0002] With the development of the national economy, especially the growth of industry and the increasing degree of mechanization, noise from factories and cities has become a public nuisance that pollutes the environment. Coupled with the emergence and development of high-rise buildings and the lessons learned from fire accidents, people urgently need better sound-absorbing materials to improve working and living conditions. Under these conditions, rock (mineral) wool sound-absorbing materials have been applied and developed. Rock (mineral) wool sound-absorbing panels are a new multifunctional decorative material, mainly used for decorative ceilings in public buildings. They have excellent sound absorption properties, can adjust indoor sound quality, and reduce noise. They are also lightweight, beautiful, and heat-insulating, which can give buildings thermal insulation properties and beautiful decorative functions.

[0003] The existing production processes of rock (mineral) wool sound-absorbing panels mainly include semi-dry production and wet production. The wet production is further divided into two production forming methods: rotary screen copying and fourdrinier copying. The semi-dry process has a long history, producing products with natural patterns and sound absorption coefficients above 0.5. However, the product variety is relatively limited, the production method is relatively primitive, and the degree of automation is low. The slurry concentration is around 50%, and the production is intermittent. The raw material starch must be pre-gelatinized before mixing and forming, resulting in high costs and low production efficiency. The forming equipment of the wet rotary screen production method is mainly modified from asbestos product production technology. While the product quality is stable, the production is discontinuous and the production efficiency is lower than that of the Fourdrinier screen production method, and this forming method is gradually being phased out. The wet Fourdrinier screen production method is the main forming method for mineral wool sound-absorbing panels today. This production technology is mainly modified from papermaking production technology. The slurry concentration of this production process is around 5%, the copying speed is fast, and the production efficiency is high. The typical production speed is 10-30 m / min. The production thickness is not limited by the equipment and can be adjusted between 7-20 mm. The product thickness can also be adjusted by changing various raw materials and adjusting various formulas to produce mineral wool sound-absorbing panels with special requirements. However, due to the different composition or production parameters of the raw materials of rock (mineral) wool sound-absorbing boards, even if the wet-method long-web production method is adopted, the sound-absorbing boards prepared still have problems such as board toughness, sound absorption performance, thermal insulation and sound insulation performance that cannot be taken into account.

[0004] Therefore, how to use a wet-laid fourdrinier production method to provide a sound-absorbing board with excellent performance is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a method for producing a sound-absorbing board by wet-process Fourdrinier sheeting and a sound-absorbing board, so as to solve the problem that the toughness, sound absorption performance and thermal insulation performance of the existing sound-absorbing board cannot be effectively balanced.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] In one aspect of the present invention, a sound-absorbing panel is provided. The sound-absorbing panel comprises the following raw materials, based on 100 parts by mass: 20-30 parts of granular cotton, 10-15 parts of perlite, 1-10 parts of waste paper, 1-10 parts of adhesive, 0.1-1 part of glass fiber, 0.1-2 parts of moisture-proof agent, and the balance water.

[0008] Preferably, the above-mentioned sound-absorbing board further comprises 0.1-2 parts of back coating adhesive, 0.1-0.5 parts of putty, and 0.01-0.2 parts of coating.

[0009] Preferably, in the above-mentioned sound-absorbing panel, the average fiber diameter of the granular cotton is ≤5.0 μm;

[0010] Furthermore, the particle size distribution of the granular cotton is as follows: the granular cotton with a particle size of ≤5 mm accounts for 10-25%, the granular cotton with a particle size of 5-12 mm accounts for 10-25%, and the granular cotton with a particle size of 12-25 mm accounts for 50-70%.

[0011] Preferably, in the above-mentioned sound-absorbing panel, the adhesive comprises any one of starch, gypsum, polyvinyl alcohol, polyester fiber, polyurethane, and epoxy resin, or a mixture of several of them.

[0012] In another aspect of the present invention, a method for preparing any of the above-mentioned sound-absorbing panels is provided, comprising the following steps:

[0013] (1) Take granular cotton, perlite, and waste paper, add water to each of them and stir until they become a paste, then fully mix and stir with a moisture-proof agent, an adhesive, and glass fiber to obtain a mixed slurry for standby use;

[0014] (2) the mixed slurry is flowed into a forming mesh bed for forming to obtain a primary wet rough board product;

[0015] (3) the wet rough board product is vacuum-absorbed, rolled and shaped, and then cut to obtain a formed wet rough board;

[0016] (4) The formed wet board is dried and dehydrated to obtain a dry board;

[0017] (5) Apply putty and paint on the front of the dry rough board in sequence, and remove the rough edges after drying to obtain the sound absorbing board.

[0018] Preferably, in the above-mentioned method for preparing the sound-absorbing board, the drying temperature in step (4) is 110-150° C., and the drying time is 60-200 min.

[0019] Preferably, in the above-mentioned preparation method of the sound-absorbing board, step (5) is specifically as follows: apply putty on the front of the dry rough board, dry it once after the application is completed, then spray paint on the putty surface, dry it again after the spraying is completed, emboss and remove the burrs to obtain the sound-absorbing board.

[0020] Preferably, in the above-mentioned method for preparing the sound-absorbing board, the drying temperature of the primary drying is 100-110° C., and the drying time is 30-120 min;

[0021] Furthermore, the drying temperature of the secondary drying is 40-80° C., and the drying time is 30-50 minutes.

[0022] Preferably, the method for preparing the sound-absorbing panel further comprises the following steps:

[0023] The front surface of the sound absorbing board is painted twice, and the back surface of the sound absorbing board is painted with back glue, and the board is packaged and stored after drying.

[0024] Preferably, in the above-mentioned method for preparing the sound-absorbing board, the secondary coating is coating with putty or paint;

[0025] Furthermore, the drying temperature is 90-120° C., and the drying time is 20-40 minutes.

[0026] The present invention provides a sound-absorbing panel and a preparation method thereof. Compared with the prior art, the present invention has the following advantages:

[0027] The sound-absorbing board prepared by the present invention using granular cotton, perlite and waste paper as raw materials has low density, good sound absorption and noise reduction effect, combustion performance reaches Class A standard, and formaldehyde emission is low, which has extremely low harm to human health. In addition, the sound-absorbing board has high bending resistance and strength, can withstand large loads and stresses, has good thermal insulation effect, low energy consumption, and is suitable for industrial large-scale production. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and the examples of the embodiments, wherein the same or similar reference numerals represent the same or similar elements or the elements with the same or similar functions throughout. The following is exemplary by reference to the examples, which are only used to explain the present invention and are not to be construed as limitations of the invention. In the embodiments, if no specific technology or conditions are indicated, the technology or conditions described in the document in this area or the product specification sheets are used. Reagents used therefor or instruments that are not indicated by the manufacturer are conventional products that can be obtained commercially.

[0029] In one aspect of the present invention, a sound absorbing panel is provided.

[0030] According to an embodiment of the present invention, the sound absorbing board includes the following raw materials based on 100 parts by mass: 20-30 parts of granular cotton, 10-15 parts of perlite, 1-10 parts of waste paper, 1-10 parts of adhesive, 0.1-1 part of glass fiber, 0.1-2 parts of moisture-proof agent, and the balance of water.

[0031] Furthermore, the sound absorbing board includes the following raw materials based on 100 parts by mass: 25 parts of granular cotton, 13 parts of perlite, 4.5 parts of waste paper, 5 parts of adhesive, 0.5 parts of glass fiber, 1 part of moisture-proof agent, and the balance of water;

[0032] Or based on 100 parts by mass, the sound absorbing board includes the following raw materials: 20 parts of granular cotton, 10 parts of perlite, 10 parts of waste paper, 1 part of adhesive, 1 part of glass fiber, 2 parts of moisture-proof agent, and the balance of water;

[0033] Or based on 100 parts by mass, the sound-absorbing board includes the following raw materials: 30 parts of granular cotton, 15 parts of perlite, 1 part of waste paper, 10 parts of adhesive, 0.1 part of glass fiber, 0.1 part of moisture-proof agent, and the balance of water.

[0034] In the present invention, granular cotton, perlite, and waste paper are used as the main raw materials of the sound-absorbing board. Granular cotton has the characteristics of high sound absorption, high heat preservation, and high flame retardancy. Perlite has the characteristics of high strength, low density, high temperature resistance, sound insulation, and heat insulation. Waste paper is environmentally friendly and recyclable. Through the reasonable combination and proportion of the three raw materials, a sound-absorbing board with excellent sound absorption, heat preservation, and flame retardancy can be prepared. At the same time, it has the characteristics of environmental protection and recyclability, which conforms to the concept of circular economy and resource recycling.

[0035] In some embodiments of the present invention, the present invention further comprises 0.1-2 parts of back coating adhesive, 0.1-0.5 parts of putty, and 0.01-0.2 parts of coating.

[0036] It is understandable that applying backing adhesive to the sound-absorbing board can improve the stickiness and strength of the sound-absorbing board, allowing it to better adhere to the wall or ceiling; applying putty on the front of the sound-absorbing board can cover the impurities exposed on the rough board surface, making the surface of the sound-absorbing board smooth and clean. The putty contains sound-insulating particles, which play a role in sound absorption and sound insulation by reducing the projected sound wave energy; in addition, spraying paint on the surface of the putty layer of the sound-absorbing board can protect the putty layer, making it less likely to fall off and crack, and achieve a smooth and bright effect. At the same time, spraying paint can also increase the decorative effect of the sound-absorbing board and improve its aesthetics. It should be noted that there is no special limitation on the models of backing adhesive, putty, and paint, and commercial products can be selected according to actual conditions.

[0037] In some embodiments of the present invention, the average fiber diameter of the granular cotton is ≤5.0 μm;

[0038] Furthermore, the particle size distribution of the granular cotton is as follows: the granular cotton with a particle size of ≤5 mm accounts for 10-25%, the granular cotton with a particle size of 5-12 mm accounts for 10-25%, and the granular cotton with a particle size of 12-25 mm accounts for 50-70%.

[0039] The granular cotton in the sound-absorbing panel provides filling, insulation, sound insulation, and fire protection. The granular cotton in the present invention is primarily made of manganese-silicon alloy hot molten slag, which is melted into a melt by the heat of a 3200KVA electric slag heating furnace. The material is added from above the heating furnace and moves downward. The hot molten slag flows downward and is heated to over 1500°C by the electric heating furnace. It then flows out through the siphon port of the heating furnace and enters a high-speed rotating four-roller centrifuge through a chute to be formed into inorganic fibers. High-pressure dust-proof oil is sprayed on the fibers. Under the action of negative pressure wind, the inorganic fibers settle in a cotton collector, are processed into short cotton by a cotton disintegrator, and are transported by a belt conveyor to a cyclone tank for sedimentation. The fibers are then processed in a granulator to form a lightweight, non-flammable granular thermal insulation and fireproof material. Finally, the granulated material is compressed and packaged by a baler.

[0040] In addition, the smaller the particle size of the granular cotton, the larger the surface area of ​​friction with the air, and the easier it is to absorb sound waves, thereby reducing sound reflection and improving the sound absorption performance of the sound-absorbing board. However, the smaller the particle size of the granular cotton, the thicker the sound-absorbing board, which easily leads to poor mechanical properties and greater processing difficulty. The present invention uses a combination of granular cottons of different particle sizes. Without increasing the processing difficulty, the above particle size distribution can achieve better sound absorption effect and good mechanical properties.

[0041] In some embodiments of the present invention, the adhesive comprises any one of starch, gypsum, polyvinyl alcohol, polyester fiber, polyurethane, and epoxy resin, or a mixture of several of them, preferably starch, which is readily available and low in cost.

[0042] In the present invention, the adhesive can firmly bond the sound absorbing panel materials together to form a complete sound absorbing panel, which plays an important role in the molding of the sound absorbing panel. The adhesive can also make the surface of the sound absorbing panel more solid, improve its strength and durability, and further, the adhesive can better adhere the sound absorbing panel materials to the bonding surface, reducing peeling and debonding.

[0043] In another aspect of the present invention, a method for preparing a sound absorbing panel is provided.

[0044] In an embodiment of the present invention, a method for preparing a sound absorbing panel comprises the following steps:

[0045] Step S100: Take granular cotton, perlite, and waste paper, add water to each of them and stir until they become a paste, then fully mix and stir with a moisture-proof agent, an adhesive, and glass fiber to obtain a mixed slurry for later use.

[0046] In this step, specifically, the main raw materials, granular cotton, perlite, and waste paper, are first placed in their respective dedicated mixing tanks, and then clean water is added and fully stirred to form a porridge paste, and then poured into a mixing tank together;

[0047] Put the moisture-proof agent, adhesive and glass fiber into the mixing tank, mix and stir them thoroughly to obtain a mixed slurry, and pump the mixed slurry into the storage tank with a water pump for standby use; to prevent the slurry from settling, stir it regularly.

[0048] Step S200: The mixed slurry is flowed into a forming mesh bed to form a wet rough board;

[0049] In this step, specifically, a slurry pump is used to deliver the mixed slurry in the storage tank into the mixing and stirring box at the upper front end of the forming line. The mixed slurry naturally flows into the small stirring box at the lower part through the drop. After the mixed slurry is stirred again in the small stirring box, it slowly flows into the forming mesh bed. The forming mesh bed drives the mixed slurry to move forward continuously. After drainage, a loose wet wool board belt is formed, which is the initial wet wool board product.

[0050] Step S300: The initial wet rough board is vacuum-absorbed, rolled and shaped, and then cut to obtain a shaped wet rough board.

[0051] In this step, the specific forming mesh bed continues to move forward, and the wet wool board is further dehydrated through vacuum absorption and roller shaping. The dehydrated water flows back to the return water pool through the lower water receiving trough for recycling.

[0052] The rough board that has undergone secondary dehydration is cut into required lengths using a high-pressure water gun. The entire wet rough board forming process is completed, and a formed wet rough board is obtained.

[0053] Step S400: The formed wet wool board is dried and dehydrated to obtain a dry wool board.

[0054] In this step, specifically: the conveying mechanism sends the formed wet wool board to the horizontal moving car, the horizontal moving car can sequentially place two wool boards side by side, the two wet wool boards are simultaneously sent to the kiln distributor through the mobile swing car conveyor roller, the distributor sends the two wet wool boards side by side into the drying kiln with a temperature of 110-150℃ through the lifting movement, the conveyor roller in the drying kiln drives the wet wool board to move forward slowly, after high-temperature steaming, circulating air cooling and dehumidification, it will be taken out of the kiln after 60-200 minutes, and the completely dehydrated dry wool board will be obtained and taken out of the kiln.

[0055] Step S500: Apply putty and paint on the front of the dry rough board in sequence, and remove the rough edges after drying to obtain the sound-absorbing board.

[0056] In this step, in order to ensure the smooth surface of the board, a layer of putty is scraped on the front of the dry rough board. After the putty is scraped, it is put into the kiln for drying at 100-110℃ for 30-120min. After the putty is dried, a layer of paint is sprayed on the surface of the putty, and it is sent to the drying kiln for drying again at 40-80℃ for 30-50min.

[0057] Furthermore, after the second drying is completed, different patterns can be rolled on the surface of the board as needed. The rough board after rolling is cut longitudinally and crosswise by a comprehensive saw to remove the burrs and make a finished sound-absorbing board of the required size.

[0058] Step S600: Apply a second coat of paint to the front surface of the sound-absorbing board, and apply back glue to the back surface of the sound-absorbing board. After drying, pack and store.

[0059] In this step, specifically, in order to further improve the quality of the finished sound-absorbing board, a second spray coating is performed on the surface of the finished sound-absorbing board, and a backing adhesive is applied to the other side of the sound-absorbing board to improve the viscosity and strength of the sound-absorbing board and prevent the board from swelling due to excessive water absorption.

[0060] It should be noted that the surface spraying of paint or puttying and the back coating of glue are carried out at the same time. After coating, it is sent to the drying kiln for drying at 90-120℃ for 20-40 minutes.

[0061] The present invention will be described below by specific embodiment, and it will be appreciated by those skilled in the art that the specific embodiment below is only for illustrative purposes, and does not limit the scope of the present invention in any way. In addition, in the following examples, unless otherwise stated, the reagent and equipment used are all commercially available. If in the following examples, concrete treatment conditions and treatment process are not clearly described, then conditions and methods well known in the art can be adopted to process.

[0062] Example 1

[0063] This embodiment provides a sound-absorbing panel comprising the following raw materials, calculated per 100 parts by mass: 25 parts granular cotton, 13 parts perlite, 4.5 parts waste paper, 5 parts adhesive, 0.5 parts glass fiber, 1 part moisture-proofing agent, 1 part backing adhesive, 0.3 parts putty, 0.1 parts coating, and the balance water. The granular cotton has an average fiber diameter of ≤5.0 μm, and the particle size distribution is as follows: 15% of the granular cotton has a particle size of ≤5 mm, 20% of the granular cotton has a particle size of 5-12 mm, and 65% of the granular cotton has a particle size of 12-25 mm.

[0064] The preparation method of the sound-absorbing panel is as follows:

[0065] (1) Take granular cotton, perlite, and waste paper, add water to each of them and stir until they become a paste, then fully mix and stir with a moisture-proof agent, an adhesive, and glass fiber to obtain a mixed slurry for standby use;

[0066] (2) the mixed slurry is flowed into a forming mesh bed to be formed to obtain a primary wet rough board;

[0067] (3) The initial wet rough board is vacuum-absorbed, rolled and shaped, and then cut to obtain a formed wet rough board;

[0068] (4) The formed wet board is dried and dehydrated in a drying kiln at 130°C for 120 minutes, and the dry board is obtained after it is taken out of the kiln;

[0069] (5) Apply a layer of putty on the front of the dry board. After the putty is applied, put it into a kiln for drying at 105°C for 60 minutes. After the putty is dried, spray a layer of paint on the surface of the putty and send it into a drying kiln for drying again at 60°C for 40 minutes. After exiting the kiln, it is embossed and deburred to obtain the sound-absorbing board.

[0070] (6) Apply a second coat of paint on the front surface of the sound-absorbing board, and apply back glue on the back surface of the sound-absorbing board. After the coating is completed, send it to a drying kiln and dry it at 100°C for 30 minutes, then pack it and put it into storage.

[0071] Example 2

[0072] This embodiment provides a sound-absorbing panel comprising the following raw materials, calculated per 100 parts by mass: 20 parts granular cotton, 10 parts perlite, 10 parts waste paper, 1 part adhesive, 1 part glass fiber, 2 parts moisture-proofing agent, 0.1 part backing adhesive, 0.5 part putty, 0.01 part coating, and the balance water. The granular cotton has an average fiber diameter of ≤5.0 μm, and the particle size distribution is as follows: 20% of the granular cotton has a particle size of ≤5 mm, 10% of the granular cotton has a particle size of 5-12 mm, and 70% of the granular cotton has a particle size of 12-25 mm.

[0073] The preparation method of the sound-absorbing panel is as follows:

[0074] (1) Take granular cotton, perlite, and waste paper, add water to each of them and stir until they become a paste, then fully mix and stir with a moisture-proof agent, an adhesive, and glass fiber to obtain a mixed slurry for standby use;

[0075] (2) the mixed slurry is flowed into a forming mesh bed to be formed to obtain a primary wet rough board;

[0076] (3) The initial wet rough board is vacuum-absorbed, rolled and shaped, and then cut to obtain a formed wet rough board;

[0077] (4) The formed wet board is dried and dehydrated in a drying kiln at 110°C for 200 minutes, and the dry board is obtained after it is taken out of the kiln;

[0078] (5) Apply a layer of putty on the front of the dry board. After the putty is applied, put it into a kiln for drying at 100°C for 120 minutes. After the putty is dried, spray a layer of paint on the putty surface and send it into a drying kiln for drying again at 40°C for 50 minutes. After exiting the kiln, it is embossed and deburred to obtain the sound-absorbing board.

[0079] (6) Apply a second coat of paint on the front surface of the sound-absorbing board, and apply back glue on the back surface of the sound-absorbing board. After the coating is completed, send it to a drying kiln and dry it at 90°C for 40 minutes, then pack it and put it into storage.

[0080] Example 3

[0081] This embodiment provides a sound-absorbing panel comprising the following raw materials, calculated per 100 parts by mass: 30 parts granular cotton, 15 parts perlite, 1 part waste paper, 10 parts adhesive, 0.1 part glass fiber, 0.1 part moisture-proofing agent, 2 parts backing adhesive, 0.1 part putty, 0.2 part coating, and the balance water. The granular cotton has an average fiber diameter of ≤5.0 μm, and the particle size distribution is as follows: granular cotton with a particle size of ≤5 mm accounts for 25%, granular cotton with a particle size of 5-12 mm accounts for 25%, and granular cotton with a particle size of 12-25 mm accounts for 50%.

[0082] The preparation method of the sound-absorbing panel is as follows:

[0083] (1) Take granular cotton, perlite, and waste paper, add water to each of them and stir until they become a paste, then fully mix and stir with a moisture-proof agent, an adhesive, and glass fiber to obtain a mixed slurry for standby use;

[0084] (2) the mixed slurry is flowed into a forming mesh bed to be formed to obtain a primary wet rough board;

[0085] (3) The initial wet rough board is vacuum-absorbed, rolled and shaped, and then cut to obtain a formed wet rough board;

[0086] (4) The formed wet board is dried and dehydrated in a drying kiln at 150°C for 60 minutes, and then taken out of the kiln to obtain the dry board;

[0087] (5) Apply a layer of putty on the front of the dry board. After the putty is applied, put it into a kiln for drying at 110°C for 30 minutes. After the putty is dried, spray a layer of paint on the surface of the putty and send it into a drying kiln for drying again at 80°C for 30 minutes. After exiting the kiln, it is embossed and deburred to obtain the sound-absorbing board.

[0088] (6) Apply a second coat of paint on the front surface of the sound-absorbing board, and apply back glue on the back surface of the sound-absorbing board. After the coating is completed, send it to a drying kiln and dry it at 120°C for 20 minutes, then pack it and put it into storage.

[0089] Comparative Example 1

[0090] Comparative Example 1 is basically the same as Example 1, except that the sound-absorbing panel includes the following raw materials, based on 100 parts by mass: 15 parts of granular cotton, 13 parts of perlite, 4.5 parts of waste paper, 5 parts of adhesive, 0.5 parts of glass fiber, 1 part of moisture-proof agent, 1 part of back-coating glue, 0.3 parts of putty, 0.1 parts of coating, and the balance of water.

[0091] Comparative Example 2

[0092] Comparative Example 2 is basically the same as Example 1, except that the sound-absorbing board includes the following raw materials, based on 100 parts by mass: 35 parts of granular cotton, 13 parts of perlite, 4.5 parts of waste paper, 5 parts of adhesive, 0.5 parts of glass fiber, 1 part of moisture-proof agent, 1 part of back-coating glue, 0.3 parts of putty, 0.1 parts of coating, and the balance of water.

[0093] Comparative Example 3

[0094] Comparative Example 3 is basically the same as Example 1, with the only difference being that the particle size distribution of the granular cotton is as follows: granular cotton with a particle size ≤ 5 mm accounts for 30%, granular cotton with a particle size of 5-12 mm accounts for 20%, and granular cotton with a particle size of 12-25 mm accounts for 50%.

[0095] Comparative Example 4

[0096] Comparative Example 4 is basically the same as Example 1, with the only difference being that the particle size distribution of the granular cotton is as follows: 10% of the granular cotton has a particle size of ≤5 mm, 20% of the granular cotton has a particle size of 5-12 mm, and 70% of the granular cotton has a particle size of 12-25 mm.

[0097] Comparative Example 5

[0098] Comparative Example 5 is basically the same as Example 1, with the only difference being that the particle size distribution of the granular cotton is as follows: granular cotton with a particle size of ≤5 mm accounts for 20%, granular cotton with a particle size of 5-12 mm accounts for 35%, and granular cotton with a particle size of 12-25 mm accounts for 45%.

[0099] Comparative Example 6

[0100] Comparative Example 6 is basically the same as Example 1, with the only difference being that the sound-absorbing board, based on 100 parts by mass, includes the following raw materials: 42 parts of granular cotton, 11.5 parts of waste paper, 5 parts of adhesive, 0.5 parts of glass fiber, 1 part of moisture-proof agent, 1 part of back-coating glue, 0.3 parts of putty, 0.1 parts of coating, and the balance of water.

[0101] Comparative Example 7

[0102] Comparative Example 7 is basically the same as Example 1, with the only difference being that the wet rough board formed in step (4) is dried and dehydrated in a drying kiln at 200° C. for 120 minutes, and then taken out of the kiln to obtain a dry rough board.

[0103] Comparative Example 8

[0104] Comparative Example 8 is basically the same as Example 1, with the only difference being that in step (5), a layer of paint is sprayed on the front of the dry rough board, which is then sent to a drying kiln for drying again at 60°C for 40 minutes. After being embossed and deburred after being taken out of the kiln, the sound-absorbing board is obtained.

[0105] Comparative Example 9

[0106] Comparative Example 9 is substantially the same as Example 1, except that step (6) is omitted.

[0107] The performance of the sound absorbing panels prepared in Examples 1-3 and Comparative Examples 1-9 was tested. The results are shown in Table 1.

[0108] Table 1

[0109]

[0110] As can be seen from Table 1, the sound-absorbing panels prepared using granular cotton, perlite, and waste paper as raw materials have a low density, good sound absorption and noise reduction effect, combustion performance reaching Class A standards, and low formaldehyde emission, which poses extremely low hazards to human health. In addition, the sound-absorbing panels have high bending resistance and strength, can withstand large loads and stresses, and have good thermal insulation effects. The quality of the sound-absorbing panels produced by the present invention meets the requirements of "Mineral Wool Decorative Sound-Absorbing Panels" (GB / T25998-2020).

[0111] As can be seen from Example 1 and Comparative Examples 1-5, the amount of granular cotton added and the particle size distribution have a significant impact on the bending resistance and strength of the sound-absorbing panel, as well as the sound absorption and noise reduction performance. In particular, the distribution of granular cotton of different particle sizes has a significant impact on the sound absorption performance and thermal insulation effect. In addition, when the amount of granular cotton added to the main raw material is too small, the flame retardant performance is significantly reduced. Therefore, it is necessary to ensure that the amount of granular cotton added to the main raw material of the sound-absorbing panel is appropriate.

[0112] As can be seen from Example 1 and Comparative Example 6, when the main raw material of the sound-absorbing board does not contain perlite, its combustion performance, bending failure load, thermal resistance, and noise reduction coefficient all fail to meet the standards. This shows that the synergistic effect of perlite, granular cotton, and waste paper can effectively improve the combustion performance, mechanical properties, sound absorption performance, and thermal insulation effect of the sound-absorbing board.

[0113] It can be seen from Examples 7-9 that when the drying temperature set for drying the wet rough board is too high, the noise reduction, heat preservation, bending resistance and strength of the sound-absorbing board are not significantly improved. Therefore, based on energy consumption considerations, the temperature for drying the wet rough board is preferably 110-150°C; when the putty is not applied before spraying the paint on the surface of the sound-absorbing board, the noise reduction coefficient of the sound-absorbing board is slightly reduced, indicating that putty can improve the sound absorption performance to a certain extent, and from the appearance, the surface flatness of the sound-absorbing board without putty is poor, that is, putty can improve the appearance of the sound-absorbing board; in addition, the secondary spraying process has a certain impact on the sound absorption performance and appearance of the sound-absorbing board, and there is no significant improvement in other aspects, so secondary spraying can be performed selectively.

[0114] In the description of this specification, the descriptions with reference to the terms "one embodiment", "another embodiment", "yet another embodiment", "some embodiments", "some specific embodiments", "some other specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are mutually inconsistent. In addition, it should be noted that in this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0115] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A sound-absorbing panel, characterized in that: The composition comprises the following raw materials based on 100 parts by mass: 20-30 parts of granular cotton, 10-15 parts of perlite, 1-10 parts of waste paper, 1-10 parts of adhesive, 0.1-1 parts of glass fiber, 0.1-2 parts of moisture-proof agent, and the balance of water; It also includes 0.1-2 parts of back coating glue, 0.1-0.5 parts of putty, and 0.01-0.2 parts of coating; The average fiber diameter of the granular cotton is ≤5.0 μm; The particle size distribution of the granular cotton is as follows: the granular cotton with a particle size of ≤5 mm accounts for 10-25%, the granular cotton with a particle size of 5-12 mm accounts for 10-25%, and the granular cotton with a particle size of 12-25 mm accounts for 50-70%; The adhesive includes any one of starch, gypsum, polyvinyl alcohol, polyester fiber, polyurethane, and epoxy resin, or a mixture of several of them.

2. A method for preparing the sound-absorbing panel according to claim 1, characterized in that: The following steps are involved: (1) Take granular cotton, perlite, and waste paper, add water to each of them and stir until they become a paste, then fully mix and stir with a moisture-proof agent, an adhesive, and glass fiber to obtain a mixed slurry for standby use; (2) the mixed slurry is flowed into a forming mesh bed for forming to obtain a primary wet rough board product; (3) the wet rough board product is vacuum-absorbed, rolled and shaped, and then cut to obtain a formed wet rough board; (4) The formed wet board is dried and dehydrated to obtain a dry board; (5) Apply putty and paint on the front of the dry rough board in sequence, and remove the rough edges after drying to obtain the sound absorbing board.

3. The method for preparing a sound-absorbing panel according to claim 2, wherein: The drying temperature in step (4) is 110-150° C., and the drying time is 60-200 min.

4. The method for preparing a sound-absorbing panel according to claim 2, wherein: Step (5) is specifically as follows: applying putty on the front of the dry rough board, drying it once after the application is completed, spraying paint on the putty surface, drying it again after the spraying is completed, embossing and removing burrs to obtain a sound-absorbing board.

5. The method for preparing a sound-absorbing panel according to claim 4, wherein: The drying temperature of the primary drying is 100-110°C and the drying time is 30-120min; The drying temperature of the secondary drying is 40-80° C., and the drying time is 30-50 min.

6. The method for preparing a sound-absorbing panel according to claim 2, wherein: The following steps are also included: The front surface of the sound absorbing board is painted twice, and the back surface of the sound absorbing board is painted with back glue, and the board is packaged and stored after drying.

7. The method for preparing a sound-absorbing panel according to claim 6, wherein: The secondary painting is painting with putty or paint; The drying temperature is 90-120° C., and the drying time is 20-40 minutes.

Images