Sound insulation and noise reduction type PC sunlight plate

Abstract

The utility model relates to the technical field of PC (Poly Carbonate) sunlight plates, in particular to a sound insulation and noise reduction type PC sunlight plate. According to the technical scheme, two PC boards are arranged, and a high-density honeycomb reflecting layer, a first nano-modified damping adhesive film, an alternate sound absorption layer, a second nano-modified damping adhesive film and a micro-perforated resonance layer are sequentially arranged between the two PC boards from top to bottom; a resonant cavity is formed in the micro-perforated resonance layer, a through hole is formed in the micro-perforated resonance layer and located at the top end of the resonant cavity, and the surface of the side, provided with the through hole, of the micro-perforated resonance layer faces the second nano modified damping adhesive film. Through the design of a multi-layer composite structure, efficient absorption and damping energy consumption of broadband sound are achieved, the sound insulation and noise reduction effect is remarkably improved, and the sound insulation and noise reduction composite board especially has better performance in a high-frequency noise environment. Meanwhile, the application of the nano-composite coating enhances the wear resistance and weather resistance of the PC board, so that the PC board can better adapt to different environmental conditions, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of PC sun sheet technology, specifically to a sound-insulating and noise-reducing PC sun sheet. Background Technology

[0002] PC sun sheets, also known as polycarbonate hollow sheets, glass kapron sheets, or polycarbonate sheets, are made from high-performance engineering plastic polycarbonate (PC) resin. They are a high-tech, high-performance, energy-saving, and environmentally friendly plastic sheet. Currently, PC sun sheets are widely used in greenhouses, industrial plants, decoration, advertising signs, parking sheds, passageway skylights, residential and commercial building skylights, exhibition lighting, stadiums, swimming pools, warehouse skylights, commercial and factory skylights and awnings, agricultural greenhouses, aquaculture and flower greenhouses, as well as public facilities such as telephone booths, newsstands, and stations, highway sound insulation, and advertising decoration.

[0003] A search revealed that patent application number 202020175263.7 discloses a PC sun sheet that provides both sound and heat insulation. This device improves the heat insulation, high-temperature resistance, and sound insulation of the PC sun sheet by incorporating multiple positioning plates, horizontal reinforcing plates, and diagonal reinforcing plates, while also increasing the sheet's strength and compressive strength. However, in practice, the sound insulation structure is relatively simple, relying solely on reinforcing plates and positioning plates to achieve sound insulation. This limits its sound insulation performance for a wide frequency range, particularly in high-frequency noise environments. Furthermore, the device does not perform any special surface treatment on the PC sheet, resulting in poor weather resistance and abrasion resistance in harsh environments, potentially impacting its lifespan. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a sound-insulating and noise-reducing PC sun sheet, which solves the problems mentioned in the background technology.

[0005] The solution to the above-mentioned technical problems provided by this utility model is as follows:

[0006] A sound-insulating and noise-reducing PC sun sheet, comprising a PC sheet;

[0007] There are two PC boards in total, and between the two PC boards, from top to bottom, there are a high-density honeycomb reflective layer, a first nano-modified damping film, an alternating sound-absorbing layer, a second nano-modified damping film, and a micro-perforated resonant layer.

[0008] The micro-perforated resonant layer has a resonant cavity, and the micro-perforated resonant layer has a through hole at the top of the resonant cavity. The side surface of the micro-perforated resonant layer with the through hole faces the second nano-modified damping film.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the thickness of the second nano-modified damping film is reduced by 30% compared to the thickness of the first nano-modified damping film.

[0011] The beneficial effects of adopting the above-mentioned further solutions are:

[0012] Nano-modified damping films of varying thicknesses can exert damping effects at different frequency bands during sound propagation. The thinner second nano-modified damping film can produce a more sensitive response to high-frequency sound vibrations, utilizing its viscoelasticity to more effectively convert high-frequency sound energy into heat energy. This complements the first nano-modified damping film, broadening the damping energy dissipation range for different sound frequencies and significantly improving the overall sound insulation and noise reduction effect, especially in high-frequency noise environments.

[0013] Furthermore, the outer surface of the PC board is coated with a nano-silica / organosilicon composite coating with a thickness of 50-200μm.

[0014] The beneficial effects of adopting the above-mentioned further solutions are:

[0015] Nano-silica imparts excellent hardness and wear resistance to the coating, effectively resisting physical damage such as wind and sand erosion and daily scratches from the external environment, protecting the basic structure of the PC board and extending its service life. Organosilicon, on the other hand, gives the coating flexibility and excellent weather resistance, allowing it to adapt to temperature and humidity changes in different regions. Whether exposed to high temperatures or in humid and rainy environments, the coating is not prone to cracking or peeling. Simultaneously, this composite coating alters the acoustic characteristics of sound propagation to the PC board surface to a certain extent, exhibiting a weak reflection and scattering effect on sound, helping to reduce the transmission of external noise and improve sound insulation performance.

[0016] Furthermore, the alternating sound-absorbing layer consists of at least three sets of alternating polyurethane foam layers and polyester fiber layers, with each layer exhibiting a gradient density distribution, and a density decrease rate Δρ from the outer layer to the inner layer of 0.15-0.25 g / cm³. 3 / layer.

[0017] The beneficial effects of adopting the above-mentioned further solutions are:

[0018] Both polyurethane foam and polyester fiber are excellent sound-absorbing materials. The porous structure of polyurethane foam allows sound waves to enter the pores and convert sound energy into heat energy through friction between air and the pore walls, as well as internal friction between air molecules. The tiny gaps formed by polyester fibers also effectively absorb sound. This multi-layered, alternating, and density-gradient structure allows the outer, higher-density layers to preferentially absorb high-frequency sounds, as these sounds resonate more easily with the relatively compact outer structure and are absorbed. The inner, lower-density layers have a better absorption effect on low-frequency sounds, as these have longer wavelengths and require a more porous structure to generate sufficient air vibrations to absorb the sound energy. This design achieves highly efficient absorption of broadband sound, significantly improving the sound insulation performance of PC sun panels in various noise environments.

[0019] Furthermore, the high-density honeycomb reflective layer adopts a gradient density design, with the outer layer having a higher honeycomb density than the inner layer, and the honeycomb wall thickness decreasing from the outer layer to the inner layer in a gradient of 0.15-0.25 mm, with a density gradient rate Δρ = 0.15-0.25 g / cm³. 3 / layer.

[0020] The beneficial effects of adopting the above-mentioned further solutions are:

[0021] When sound propagates through honeycomb layers of varying densities and wall thicknesses, it undergoes multiple reflections and refractions at the interfaces between layers due to differences in acoustic impedance. The gradient density design causes sound to continuously change its propagation direction within the honeycomb structure, significantly increasing the propagation path and resulting in the dissipation of a large amount of acoustic energy. The outer, higher-density, and thicker honeycomb walls provide initial reflection and scattering of high-frequency sounds, while the inner, lower-density, and thinner honeycomb walls offer better handling of low-frequency sounds. This layered gradient design effectively reduces the penetration ability of sounds at different frequencies, significantly improving the sound insulation performance of PC sun panels and enhancing the overall structural stability.

[0022] This utility model provides a sound-insulating and noise-reducing PC sun panel. It has the following beneficial effects:

[0023] The design employs a gradient density approach, where the outer honeycomb layer has a higher density than the inner layer, and the honeycomb wall thickness decreases gradually from the outer to the inner layer, resulting in a reasonable density gradient rate. This design allows sound to be continuously reflected and refracted through honeycomb layers of varying densities and wall thicknesses as it passes through the honeycomb structure, increasing the path length of sound propagation and effectively reflecting and scattering sound, thus reducing direct sound penetration.

[0024] A first nano-modified damping film and a second nano-modified damping film were configured. The nano-modification technology gives the films better damping performance, enabling them to dissipate sound energy into other forms of energy such as heat. Simultaneously, the thickness of the second nano-modified damping film is 30% less than that of the first nano-modified damping film. This difference in thickness allows for better damping at different frequencies, broadening the absorption range for sounds of various frequencies.

[0025] It consists of at least three alternating layers of polyurethane foam and polyester fiber, with each layer exhibiting a gradient density, decreasing from the outermost layer to the innermost. Both polyurethane foam and polyester fiber are excellent sound-absorbing materials. The alternating multi-layered structure can absorb sound at different frequencies. The higher-density outer layers absorb high-frequency sounds, while the lower-density inner layers have a better absorption effect on low-frequency sounds. Through this gradient distribution and alternating structure, effective absorption of a wide frequency range of sounds can be achieved.

[0026] The surface has a resonant cavity and a through hole. When sound travels to the micro-perforated resonant layer, it causes the air to vibrate in the through hole and the resonant cavity. By utilizing the principle of resonance, the sound of a specific frequency consumes energy during the resonance process, thereby achieving the purpose of sound absorption and noise reduction. It has a good suppressive effect on noise in a specific frequency band.

[0027] The outer surface of the PC sheet is coated with a nano-silica / organic silicon composite coating with a thickness of 50-200μm. Nano-silica has good wear resistance and hardness, which can improve the scratch resistance of the PC sheet surface and protect the PC sheet from damage from the external environment; organic silicon has good flexibility and weather resistance, which allows the coating to adapt to different environmental temperature and humidity changes, and is not easy to crack or peel off, thereby extending the service life of the PC sun sheet. It can also help with sound insulation and noise reduction to a certain extent. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0029] In the attached diagram:

[0030] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0031] Figure 2 This is a schematic cross-sectional view of the micro-perforated resonant layer structure of this utility model.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. PC board; 2. High-density honeycomb reflective layer; 3. First nano-modified damping film; 4. Alternating sound-absorbing layer; 5. Second nano-modified damping film; 6. Micro-perforated resonant layer; 601. Through hole; 602. Resonant cavity. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figures 1 to 2 As shown, the embodiments provided by this utility model are as follows:

[0036] Example 1

[0037] A sound-insulating and noise-reducing PC sun panel includes two PC panels 1. Between the two PC panels 1, from top to bottom, are arranged a high-density honeycomb reflective layer 2, a first nano-modified damping film 3, an alternating sound-absorbing layer 4, a second nano-modified damping film 5, and a micro-perforated resonant layer 6. The outer surface of the PC panel 1 is coated with a nano-silica / organic silicon composite coating with a thickness of 50-200μm. The nano-silica gives the coating good hardness and wear resistance, which can effectively resist physical damage such as wind and sand erosion and daily scratches in the external environment, protect the basic structure of the PC panel 1, and extend its service life. The organic silicon gives the coating flexibility and excellent weather resistance, enabling it to adapt to temperature and humidity changes in different regions. Whether exposed to high temperatures or in humid and rainy environments, the coating is not easy to crack or peel off. Meanwhile, this composite coating alters the acoustic characteristics of sound propagation to the surface of PC board 1 to a certain extent, exhibiting weak reflection and scattering effects on sound, thus helping to reduce external noise transmission and improve sound insulation performance. The high-density honeycomb reflective layer 2 adopts a gradient density design, with the outer honeycomb density higher than the inner layer, and the honeycomb wall thickness decreasing from the outer layer to the inner layer in a gradient of 0.15-0.25mm, with a density gradient rate Δρ = 0.15-0.25g / cm². 3In a honeycomb structure, sound propagates through layers of varying densities and thicknesses. Due to differences in acoustic impedance, sound undergoes multiple reflections and refractions at the interfaces between layers. The gradient density design causes sound to continuously change its propagation direction within the honeycomb structure, significantly increasing the propagation path and consuming a large amount of acoustic energy in the process. The outer, higher-density, and thicker honeycomb walls provide initial reflection and scattering of high-frequency sounds, while the inner, lower-density, and thinner honeycomb walls offer better handling of low-frequency sounds. This layered gradient design effectively reduces the penetration of different frequencies of sound, significantly improving the sound insulation performance of the PC sun panel and enhancing the overall structural stability. The alternating sound-absorbing layer 4 consists of at least three sets of alternating polyurethane foam layers and polyester fiber layers, with a gradient density distribution across each layer. The density decrease rate from the outer to the inner layer is Δρ = 0.15-0.25 g / cm³. 3 The polyurethane foam and polyester fiber are both excellent sound-absorbing materials. The porous structure of the polyurethane foam allows sound waves to enter the pores and convert sound energy into heat energy through friction between air and the pore walls, as well as internal friction between air molecules. The tiny gaps formed by the polyester fiber also effectively absorb sound. This multi-layered, alternating, and density-gradient structure allows the outer, higher-density layer to preferentially absorb high-frequency sounds, as high-frequency sounds are more likely to resonate with and be absorbed by the relatively compact outer structure. The inner, lower-density layer has a better absorption effect on low-frequency sounds, as low-frequency sounds have longer wavelengths and require a looser structure to induce sufficient air vibrations to absorb sound energy. This design achieves efficient absorption of broadband sounds, greatly improving the sound insulation performance of the PC sun panel in different frequency noise environments. The thickness of the second nano-modified damping film 5 is 30% less than that of the first nano-modified damping film 3. Nano-modified damping films of different thicknesses can play a damping role in different frequency bands during sound propagation. The thinner second nano-modified damping film 5 can generate a more sensitive response to high-frequency sound vibrations. It utilizes its viscoelasticity to more effectively convert high-frequency sound energy into heat energy, complementing the first nano-modified damping film 3. This broadens the damping energy dissipation range for different frequencies of sound, significantly improving the overall sound insulation and noise reduction effect, especially in high-frequency noise environments.

[0038] Example 2

[0039] To further enhance sound insulation and noise reduction performance, for example, such as Figures 1 to 2 As shown, the present invention also includes: a resonant cavity 602 is formed on the micro-perforated resonant layer 6, a through hole 601 is formed at the top of the resonant cavity 602 on the micro-perforated resonant layer 6, and the side surface of the micro-perforated resonant layer 6 with the through hole 601 faces the second nano-modified damping film 5.

[0040] Working principle:

[0041] External noise first comes into contact with the outer surface of the PC board, at which point the nano-silica / organic silicon composite coating on the outer surface of the PC board begins to function. Nano-silica provides high hardness and wear resistance, protecting the PC board surface from physical damage such as scratches, while organic silicon gives the coating good flexibility and weather resistance, allowing it to adapt to different environmental conditions. From a sound insulation perspective, although the coating is not the primary sound insulation structure, because it adheres tightly to the PC board surface, it can, to some extent, alter the initial interface characteristics of sound propagation, exhibiting a slight reflection and scattering effect on sound, reducing some sound from directly entering the interior of the PC board.

[0042] After passing through the PC board, the sound reaches the high-density honeycomb reflective layer 2. Because this layer employs a gradient density design, the outer honeycomb density is higher than the inner layer, and the honeycomb wall thickness decreases gradually from the outer layer to the inner layer in a gradient of 0.15-0.25 mm, with a density gradient rate Δρ = 0.15-0.25 g / cm³. 3 / Layer. When sound travels through honeycomb layers of varying densities and thicknesses, it undergoes multiple reflections and refractions. The principle is that when sound propagates in different media (here, honeycomb structures of varying densities), due to differences in acoustic impedance, some sound is reflected back at the interfaces. The gradient design causes the sound to continuously change its propagation direction within the honeycomb layers, increasing the propagation path length and thus consuming a significant amount of acoustic energy, effectively reducing the sound's penetration ability.

[0043] The sound, after initial treatment by the high-density honeycomb reflective layer 2, continues to propagate to the first nano-modified damping membrane 3. The nano-modified damping membrane possesses unique viscoelasticity; when sound causes the membrane to vibrate, the polymer chains within it undergo relative motion, and the internal friction between molecules converts sound energy into heat energy, which is then dissipated. This process of converting mechanical energy (sound energy) into heat energy is based on the properties of the damping material. The first nano-modified damping membrane 3, with its nano-modified microstructure, produces a good damping effect on sound vibrations over a wide frequency range, further reducing sound energy.

[0044] The sound then reaches the alternating sound-absorbing layer 4, which consists of at least three alternating layers of polyurethane foam and polyester fiber, with each layer exhibiting a gradient density distribution. The density decrease rate from the outer layer to the inner layer is Δρ = 0.15-0.25 g / cm³. 3 / Layer. Polyurethane foam has a porous structure. When sound waves enter the pores, they cause the air inside to vibrate. Due to friction between the air and the pore walls, as well as internal friction between air molecules, the sound energy is converted into heat energy and absorbed. Polyester fibers are also porous sound-absorbing materials, and the tiny gaps between the fibers can also absorb sound. The outer, higher-density layer is more effective at absorbing high-frequency sounds because high-frequency sounds are more likely to cause vibrations in the microstructure of the material surface and be absorbed. The inner, lower-density layer is more effective at absorbing low-frequency sounds because low-frequency sounds have longer wavelengths and require more space and a looser structure to induce sufficient air vibrations to absorb the sound energy. This gradient distribution of alternating layers, through the targeted absorption of different frequencies of sound by different materials and densities, achieves broadband sound absorption.

[0045] After passing through the alternating sound-absorbing layer 4, the remaining sound propagates to the second nano-modified damping membrane 5. The thickness of the second nano-modified damping membrane 5 is 30% less than that of the first nano-modified damping membrane 3. Although the thicknesses differ, it also utilizes the viscoelasticity imparted by nano-modification to convert sound energy into heat energy through intramolecular friction. Due to the thickness difference, its damping characteristics vary at different frequencies, complementing the first nano-modified damping membrane 3. This further dampens and dissipates the energy of specific frequency sound vibrations remaining after the previous layers, thus further reducing sound energy.

[0046] Finally, the sound propagates to the micro-perforated resonant layer 6. A resonant cavity 602 is formed on the micro-perforated resonant layer 6, and a through-hole 601 is formed at the top of the resonant cavity 602. The side surface of the micro-perforated resonant layer 6 with the through-hole 601 faces the second nano-modified damping film 5. When the sound wave propagates to the micro-perforated resonant layer 6, the sound wave causes the air to vibrate within the through-hole 601 and the resonant cavity 602. According to the principle of resonance, when the frequency of the external sound is close to the natural frequency of the resonant cavity 602, resonance occurs. At this time, the air vibrates violently. During the resonance process, the friction between the air and the pore walls, as well as the internal friction between air molecules, consumes a large amount of sound energy, thus significantly reducing noise and sound at specific frequencies. After this series of structural treatments, the sound energy passing through the PC sun panel is significantly reduced, achieving a good sound insulation and noise reduction effect.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sound-insulating and noise-reducing PC sun sheet, comprising a PC sheet (1), characterized in that: The PC board (1) is provided in two parts, and the two PC boards (1) are provided with a high-density honeycomb reflective layer (2), a first nano-modified damping film (3), an alternating sound-absorbing layer (4), a second nano-modified damping film (5) and a micro-perforated resonant layer (6) from top to bottom. The micro-perforated resonant layer (6) has a resonant cavity (602) formed on it. The micro-perforated resonant layer (6) has a through hole (601) at the top of the resonant cavity (602). The side surface of the micro-perforated resonant layer (6) with the through hole (601) faces the second nano-modified damping film (5).

2. The sound-insulating and noise-reducing PC sun sheet according to claim 1, characterized in that: The thickness of the second nano-modified damping film (5) is reduced by 30% compared with the thickness of the first nano-modified damping film (3).

3. The sound-insulating and noise-reducing PC sun sheet according to claim 1, characterized in that: The outer surface of the PC board (1) is coated with a nano-silica / organosilicon composite coating with a thickness of 50-200μm.

4. The sound-insulating and noise-reducing PC sun sheet according to claim 1, characterized in that: The alternating sound-absorbing layer (4) consists of at least three sets of alternating polyurethane foam layers and polyester fiber layers, with each layer exhibiting a gradient density distribution, and a density decrease rate Δρ from the outer layer to the inner layer of 0.15-0.25 g / cm³. 3 / layer.

5. The sound-insulating and noise-reducing PC sun sheet according to claim 1, characterized in that: The high-density honeycomb reflective layer (2) adopts a gradient density design, with the outer layer having a higher honeycomb density than the inner layer, and the honeycomb wall thickness decreasing from the outer layer to the inner layer in a gradient of 0.15-0.25 mm, with a density gradient rate Δρ = 0.15-0.25 g / cm³. 3 / layer.

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