Multilayer sound absorption and insulation material and preparation method thereof

Abstract

The invention relates to a multi-layer sound absorption and insulation material and a preparation method thereof.The multi-layer sound absorption and insulation material comprises an inner micropore sound absorption layer, a vibration attenuation damping layer, a sound insulation plate layer, a main frame layer, a sound absorption material layer and an outer steel plate layer which are sequentially arranged from inside to outside, a plurality of hollow glass balls are evenly arranged in the main frame layer, and the sound absorption material layer is obtained by pressing multiple layers of composite sound materials; the composite acoustic material comprises the following raw materials in parts by weight: 10-15 parts of fibers, 4-8 parts of an adhesive, 3-8 parts of a foaming agent, 1-3 parts of a flame retardant, 10-20 parts of a plasticizer, 10-20 parts of resin, 1-3 parts of a lubricant, 5-10 parts of an organic sound absorber and 1-5 parts of an antioxidant. According to the sound absorption and insulation material, the inner micropore sound absorption layer, the vibration reduction damping layer, the sound insulation plate layer and other multi-layer structures are arranged from inside to outside, all the layers have a synergistic effect, sound wave propagation can be dealt with from multiple aspects, and the sound absorption and insulation material is suitable for various places with requirements for the acoustic environment, such as the fields of building sound insulation, industrial equipment noise reduction and the like.

Description

Technical Field

[0001] The invention relates to the technical field of sound insulation and sound absorption materials, and in particular to a multi-layer sound absorption and sound insulation material and a preparation method thereof. Background Art

[0002] During the operation of equipment in the automobile, home appliance, and equipment industries, noise is often generated due to movement, vibration, and clapping. At present, in order to solve the noise problem, the conventional solution is to place a single-layer / double-layer / triple-layer sound insulation material around the equipment. Traditional sound insulation materials are often made of rags or polyester fibers composited with rubber and aluminum foil. However, the existing sound insulation materials have a simple sound insulation structure and poor insulation for low-frequency noise around 1000Hz. Low-frequency resonant noise greatly affects the customer's experience. For this reason, we propose a multi-layer sound-absorbing and sound-insulating material. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a multi-layer sound-absorbing and sound-insulating material, which has a multi-layer structure including an inner microporous sound-absorbing layer, a vibration-reducing and damping layer, a sound insulation board layer, etc. from the inside to the outside. The layers work together to cope with the propagation of sound waves from many aspects, and are suitable for a variety of places with requirements on the acoustic environment, such as building sound insulation, industrial equipment noise reduction and other fields.

[0004] Another object of the present invention is to provide a method for preparing a multi-layer sound-absorbing and sound-insulating material, which has simple operation, convenient control, high production efficiency, low production cost, and is suitable for large-scale production.

[0005] The object of the present invention is achieved through the following technical scheme: a multi-layer sound-absorbing and sound-insulating material, comprising an inner microporous sound-absorbing layer, a vibration-reducing and damping layer, a sound-insulating board layer, a main frame layer, a sound-absorbing material layer and an outer steel plate layer arranged in sequence from the inside to the outside, a plurality of hollow glass balls are evenly arranged in the main frame layer, and the sound-absorbing material layer is obtained by pressing a plurality of layers of composite sound materials, and the composite sound material comprises the following raw materials in parts by weight: 10-15 parts of fiber, 4-8 parts of adhesive, 3-8 parts of foaming agent, 1-3 parts of flame retardant, 10-20 parts of plasticizer, 10-20 parts of resin, 1-3 parts of lubricant, 5-10 parts of organic sound absorbent, and 1-5 parts of antioxidant.

[0006] The sound-absorbing and sound-insulating material of the present invention is provided with a multi-layer structure including an inner microporous sound-absorbing layer, a vibration-reducing and damping layer, a sound-insulating board layer, etc. from the inside to the outside. The layers work together to cope with the propagation of sound waves from multiple aspects. The inner microporous sound-absorbing layer can initially absorb the sound entering the material and reduce sound reflection; the vibration-reducing damping layer can weaken vibration transmission, avoid the generation of secondary noise caused by vibration, and enhance the obstruction to sound propagation; the sound insulation board layer mainly plays the role of blocking sound propagation, and cooperates with other layers to further enhance the overall sound insulation effect; the hollow glass balls evenly distributed in the main frame layer also help to disrupt the sound propagation path, scatter sound waves, etc., to assist in improving the sound absorption and sound insulation capabilities; the outer steel plate layer of the outer layer, on the one hand, protects the internal layers, and on the other hand, its own rigidity and other characteristics are also conducive to reflecting part of the sound, reducing the external sound input and the internal sound output; the sound-absorbing material layer is formed by pressing together multiple layers of composite sound materials, which can further enhance the absorption effect of sounds in different frequency bands, so that the entire material has excellent comprehensive sound absorption and sound insulation performance, and is suitable for a variety of places with requirements for acoustic environment, such as building sound insulation, industrial equipment noise reduction and other fields. In the composite sound material composed of multiple raw materials, the fiber can be used as a skeleton structure to provide a certain shape retention ability for the entire sound-absorbing material layer and help the multiple reflections and absorption of sound inside the material. Different types of fibers are blended in proportion to combine their respective advantages and improve the overall performance of the material; silane coupling agent, as an adhesive, can effectively enhance the bonding force between the raw materials, making the structure of the composite sound material more stable and less prone to stratification during use, thereby ensuring long-term stable sound absorption performance; the foaming agent titanium hydride can form a porous structure inside the material, which is a good sound absorption structure. Sound waves enter the porous interior and convert sound energy into heat energy after multiple reflections and friction, thereby achieving a sound absorption effect; the flame retardant antimony trioxide can improve the overall flame retardant properties of the material and increase the safety of the material, especially in some environments with fire protection requirements; the plasticizer propylene glycol butyl ether can improve the material The processing properties such as flexibility make it easier to process and shape it into the required shape of the sound-absorbing material layer; the resin component gives the material certain elasticity, viscosity and other properties, which is helpful for the dissipation of sound energy and sound absorption, while improving the overall physical properties and stability of the material; stearic acid, as a lubricant, can reduce the friction of the material during processing, facilitating production and manufacturing; organic sound absorbers can absorb sounds in specific frequency bands in a targeted manner, further optimize the sound absorption spectrum range of the sound-absorbing material layer, and improve the sound absorption efficiency; antioxidants can delay the oxidation and aging process of the material, ensuring that the material maintains good sound absorption and sound insulation properties for a long time; in addition, the composite sound material not only has the main functions of sound absorption and sound insulation, but also has flame retardant, antioxidant, durable and other properties due to the addition of flame retardants, antioxidants and other ingredients. It can adapt to different use environments and working conditions, has high practical value, and broadens its application scenarios.

[0007] Preferably, the fiber is flame-retardant polyester fiber, PET fiber or a fiber formed by blending rags with flame-retardant polyester.

[0008] In the present invention, different types of fibers (flame-retardant polyester fiber, PET fiber and flame-retardant polyester) are blended in proportion, which can combine their respective advantages and improve the overall performance of the material.

[0009] Preferably, the adhesive is at least one of a silane coupling agent, a flame retardant polyester, and an epoxy resin.

[0010] Preferably, the foaming agent is at least one of titanium hydride, foaming agent AC, and sodium carbonate.

[0011] Preferably, the flame retardant is at least one of antimony trioxide, melamine, melamine cyanurate, melamine polyphosphate, phosphazene, and ammonium polyphosphate.

[0012] Preferably, the plasticizer is at least one of propylene glycol butyl ether, propylene glycol methyl ether acetate, paraffin oil, and dibutyl phthalate.

[0013] Preferably, the resin is composed of ethylene propylene diene monomer rubber, vinyl chloride vinyl acetate resin, and methyl vinyl silicone rubber in a mass ratio of 0.4-0.8:1-3:1-1.5.

[0014] Preferably, the lubricant is at least one of stearic acid, oleamide, erucamide, silicone powder, zinc stearate, calcium stearate, magnesium stearate, ethylene bisstearamide, and PE wax.

[0015] Preferably, the organic sound absorber is at least one of polymethyl methacrylate PMMA powder, PLGA polymer microspheres, silicone rubber micropowder, composite micropowder, azine-based porous polymer, porous aromatic skeleton polymer, loofah and lotus leaf stem.

[0016] The flame-retardant polyester fiber, PET fiber and flame-retardant polyester blended fiber in the present invention have many active groups and physical adsorption sites on their surfaces. The silane coupling agent molecules contain hydrolyzable groups (such as alkoxy groups, etc.) and functional groups (such as amino groups) that can react chemically or physically adsorb with the active groups on the fiber surface. In the presence of water, the alkoxy groups of the silane coupling agent are hydrolyzed to form silanols. On the one hand, the silanols can condense and crosslink themselves, and on the other hand, they can react with active groups such as hydroxyl groups on the fiber surface to form a strong chemical bond. At the same time, through physical adsorption and other effects, the fibers can be closely combined to form a stable network structure, laying a structural foundation for the entire composite acoustic material, ensuring that the material will not easily fall apart when subjected to external forces such as sound wave vibrations; the foaming agent titanium hydride will decompose and produce gas (such as hydrogen) under conditions such as heat during processing, and these gases form bubble nuclei inside the material and gradually grow to form a porous structure. The resin component has a certain fluidity and plasticity under processing temperature and other conditions. The pores formed by the gas are wrapped and filled with resin. The resin will grow and solidify in a certain shape as the bubbles grow and stabilize, forming a porous network that is interconnected or closed. This porous structure is combined with the elasticity, viscosity and other properties of the resin itself. When sound waves enter, they can convert sound energy into heat energy and consume it through the compression and expansion of the air in the pores and the friction and viscosity with the pore walls (resin, etc.), thereby achieving a sound absorption effect. At the same time, the resin and other components such as fibers and flame retardants are intertwined to jointly build a stable structural system with acoustic functions inside the material; the flame retardant antimony trioxide will participate in the thermal decomposition process of the material when encountering high temperature and other fire conditions, and release some substances with fire extinguishing or combustion inhibition effects to prevent or delay the combustion of the material and ensure the flame retardant properties of the material. The plasticizer propylene glycol butyl ether can be inserted between polymer chains such as resins, and by weakening the interaction between polymer chains and increasing the activity of chain segments, the processing properties such as flexibility of the material are improved, which facilitates the material to better integrate with other components during the processing and molding process, such as making the fiber more evenly distributed in it. The lubricant stearic acid is mainly distributed on the interface between the material and the processing equipment and the internal components of the material. Its long-chain alkyl structure forms a lubricating film, reduces friction, and facilitates the smooth progress of the material in the processing procedures such as mixing and pressing, ensuring that the raw materials can be evenly mixed and formed into the required composite sound material structure. Organic sound absorbers (PLGA polymer microspheres, silicone rubber micropowders and composite micropowders) are evenly dispersed in a matrix constructed by fibers, resins, etc., and use their own special microstructures (such as the pores of microspheres, the surface characteristics of micropowders, etc.) to interact with sound waves to achieve absorption of sound waves. They are mainly physically mixed and dispersed with other components, and work together to improve the overall sound absorption effect.Antioxidants can capture active oxidative species such as free radicals generated during the processing and use of materials, prevent excessive oxidation and breakage of polymer chains, maintain the stability of material structure and performance, enable it to maintain good sound absorption and sound insulation functions for a long time, and work together with other ingredients to ensure the durability of the material.

[0017] More preferably, the composite micropowder comprises the following raw materials in parts by weight: 20-40 parts of hollow silicone microspheres, 5-25 parts of acrylic resin, 3-7 parts of benzoin ethyl ether, and 1-3 parts of vinyl silane; the composite micropowder is prepared by the following method:

[0018] A1. Place the hollow silicone microspheres at the bottom of the fluidized bed reaction chamber and inject air from the gas inlet at the bottom of the fluidized bed reaction chamber to keep the hollow microspheres in a suspended state;

[0019] A2. According to parts by weight, acrylic resin, benzoin ethyl ether and vinyl silane are placed in a storage chamber at the upper part of the fluidized bed reaction chamber, sprayed into the fluidized bed reaction chamber through an atomizing nozzle, irradiated with an ultraviolet lamp, and cured to obtain composite micropowder.

[0020] The composite micropowder of the above raw materials used in the present invention can not only achieve enhanced weight loss effect compared with ordinary hollow microsphere materials, but also has better sound absorption performance due to the presence of acrylic resin coating layer; during preparation, the organosilicon hollow microspheres coated with acrylic resin are used as filling materials to improve the sound absorption performance and other requirements. Specifically, the elastic relaxation effect of acrylic resin and the cavity resonance sound absorption of organosilicon hollow microspheres, as well as multiple interface effects, can greatly improve the sound absorption capacity of the material. During the preparation process, in the fluidized bed reaction chamber, the organosilicon hollow microspheres are in a suspended state, providing a "core" or "skeleton" structure for the subsequent formation of composite micropowders. After the acrylic resin is sprayed in through an atomizing nozzle, under the conditions of benzoin ethyl ether as a photoinitiator and ultraviolet light irradiation, the carbon-carbon double bonds in the acrylic resin are opened to undergo free radical polymerization, and the molecular chains continue to grow and cross-link to form a three-dimensional network structure. In this process, there may be some active groups (such as hydroxyl groups) on the surface of the hollow silicone microspheres, which will physically adsorb or chemically bond with the polymer chains growing from the acrylic resin, so that the acrylic resin can wrap and adhere to the surface of the hollow silicone microspheres, thereby fixing the hollow microspheres in the formed polymer network, enhancing the overall structural strength and stability of the composite micropowder, and also giving the composite micropowder unique sound absorption properties due to the hollow structure of the hollow microspheres and the viscoelasticity of the resin. The benzoin ether used is a commonly used photoinitiator. When irradiated by ultraviolet light, benzoin ether absorbs ultraviolet energy of a specific wavelength, and the chemical bonds in its molecular structure break, generating active species such as free radicals. These active species will trigger the opening of the carbon-carbon double bonds in the acrylic resin molecules, start the polymerization reaction, and gradually transform the resin from a liquid monomer into a solid polymer, playing a key role in initiating the polymerization reaction, determining the formation speed and curing degree of the composite micropowder, and having an important influence on the properties of the final composite micropowder (such as physical properties such as hardness and elasticity, and sound absorption properties, etc.). Vinyl silane molecules contain hydrolyzable groups and active functional groups such as carbon-carbon double bonds. In the reaction system, alkoxy groups may undergo hydrolysis to generate silanols. On the one hand, silanols can condense and cross-link themselves, and on the other hand, they can undergo condensation reactions with active groups such as hydroxyl groups on the surface of hollow silicone microspheres or hydroxyl groups on acrylic resin polymer chains to form chemical bonds, thereby enhancing the binding force between the components, improving the stability of the composite micropowder and its compatibility with other raw materials (such as resins and fibers in subsequent sound-absorbing material layers), so that it can better play a synergistic role in the entire sound-absorbing and sound-insulating material system.

[0021] The present invention also provides a method for preparing a multi-layer sound-absorbing and sound-insulating material, comprising the following steps:

[0022] S1. According to parts by weight, fibers, adhesives, foaming agents, flame retardants, plasticizers, resins, lubricants, organic sound absorbers, and antioxidants are mixed, kneaded, extruded, and pressed into sheets to obtain a composite sound material for later use;

[0023] S2, pressing the multi-layer composite sound material to obtain a sound absorbing material layer;

[0024] S3, processing the inner microporous sound absorbing layer, the vibration damping layer, the sound insulation board layer, the main frame layer, the sound absorbing material layer and the outer steel plate layer into sheets respectively;

[0025] S3. Coat a layer of adhesive on the surface of each layer of material, and bond each layer layer by layer through hot pressing to finally form a sound-absorbing and sound-insulating material.

[0026] The sound-absorbing and sound-insulating material of the present invention is prepared by the above method. During the preparation process, the weighed fibers, adhesives, foaming agents, flame retardants, plasticizers, resins, lubricants, organic sound absorbers, antioxidants and other raw materials are put into a suitable mixing equipment (such as an internal mixer, an open mixer, etc.), and fully mixed under certain process conditions such as temperature and rotation speed to make the raw materials uniformly dispersed. In this process, the foaming agent and the like should pay attention to controlling the temperature to avoid premature decomposition, etc. The lubricant plays a role in reducing the friction between the materials to ensure smooth mixing. After uniform mixing, it is made into a multi-layer composite sound material that meets the requirements through a molding process such as pressing, and then the multi-layer composite sound material is assembled and bonded with the inner microporous sound absorbing layer, the vibration damping layer, the sound insulation board layer, the main frame layer, the outer steel plate layer, etc. in an order from the inside to the outside, and finally a multi-layer sound-absorbing and sound-insulating material finished product is formed to ensure the stability and consistency of the product quality so that it can achieve the expected performance indicators such as sound absorption and sound insulation.

[0027] The beneficial effect of the present invention is that the sound-absorbing and sound-insulating material of the present invention is provided with a multi-layer structure including an inner microporous sound-absorbing layer, a vibration-reducing and damping layer, a sound-insulating board layer, etc. from the inside to the outside. The layers work together to cope with the propagation of sound waves from multiple aspects, and are suitable for a variety of places that have requirements for the acoustic environment, such as building sound insulation, industrial equipment noise reduction and other fields.

[0028] The invention discloses a method for preparing a multi-layer sound-absorbing and sound-insulating material. The method has the advantages of simple operation, convenient control, high production efficiency, low production cost and is suitable for large-scale production. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0030] Example 1

[0031] A multi-layer sound-absorbing and sound-insulating material comprises an inner microporous sound-absorbing layer, a vibration-reducing and damping layer, a sound-insulating board layer, a main frame layer, a sound-absorbing material layer and an outer steel plate layer which are arranged in sequence from the inside to the outside, wherein a plurality of hollow glass balls are evenly arranged in the main frame layer, and the sound-absorbing material layer is obtained by pressing together a plurality of multi-layer composite sound materials, wherein the composite sound material comprises the following raw materials in parts by weight: 10 parts of fiber, 4 parts of adhesive, 3 parts of foaming agent, 1 part of flame retardant, 10 parts of plasticizer, 10 parts of resin, 1 part of lubricant, 5 parts of organic sound-absorbing agent and 1 part of antioxidant.

[0032] The fiber is a fiber formed by blending flame-retardant polyester fiber, PET fiber and flame-retardant polyester in a mass ratio of 0.4:0.8:0.6.

[0033] The adhesive is a silane coupling agent. The foaming agent is titanium hydride.

[0034] The flame retardant is antimony trioxide. The plasticizer is propylene glycol butyl ether.

[0035] The resin is composed of ethylene propylene diene monomer rubber, vinyl chloride vinyl acetate resin and methyl vinyl silicone rubber in a mass ratio of 0.4:1:1.

[0036] The lubricant is stearic acid.

[0037] The organic sound absorber is composed of PLGA polymer microspheres, organic silicon rubber micropowder and composite micropowder in a mass ratio of 0.4:0.3:0.8.

[0038] The composite micropowder comprises the following raw materials in parts by weight: 20 parts of hollow silicone microspheres, 5 parts of acrylic resin, 3 parts of benzoin ethyl ether, and 1 part of vinyl silane; the composite micropowder is prepared by the following method:

[0039] A1. Place the hollow silicone microspheres at the bottom of the fluidized bed reaction chamber and inject air from the gas inlet at the bottom of the fluidized bed reaction chamber to keep the hollow microspheres in a suspended state;

[0040] A2. According to parts by weight, acrylic resin, benzoin ethyl ether and vinyl silane are placed in a storage chamber at the upper part of the fluidized bed reaction chamber, sprayed into the fluidized bed reaction chamber through an atomizing nozzle, irradiated with an ultraviolet lamp, and cured to obtain composite micropowder.

[0041] The multi-layer sound absorbing and sound insulating material is prepared by the following steps:

[0042] S1. According to parts by weight, fibers, adhesives, foaming agents, flame retardants, plasticizers, resins, lubricants, organic sound absorbers, and antioxidants are mixed, kneaded, extruded, and pressed into sheets to obtain a composite sound material for later use;

[0043] S2, pressing the multi-layer composite sound material to obtain a sound absorbing material layer;

[0044] S3, processing the inner microporous sound absorbing layer, the vibration damping layer, the sound insulation board layer, the main frame layer, the sound absorbing material layer and the outer steel plate layer into sheets respectively;

[0045] S3. Coat a layer of adhesive on the surface of each layer of material, and bond each layer layer by layer through hot pressing to finally form a sound-absorbing and sound-insulating material.

[0046] Example 2

[0047] A multi-layer sound-absorbing and sound-insulating material comprises an inner microporous sound-absorbing layer, a vibration-reducing and damping layer, a sound-insulating board layer, a main frame layer, a sound-absorbing material layer and an outer steel plate layer which are arranged in sequence from the inside to the outside, wherein a plurality of hollow glass balls are evenly arranged in the main frame layer, and the sound-absorbing material layer is obtained by pressing together a plurality of multi-layer composite sound materials, wherein the composite sound material comprises the following raw materials in parts by weight: 13 parts of fiber, 6 parts of adhesive, 5 parts of foaming agent, 2 parts of flame retardant, 15 parts of plasticizer, 15 parts of resin, 2 parts of lubricant, 8 parts of organic sound-absorbing agent and 3 parts of antioxidant.

[0048] The fiber is a fiber formed by blending flame-retardant polyester fiber, PET fiber and flame-retardant polyester in a mass ratio of 0.6:1.0:0.8.

[0049] The adhesive is composed of flame-retardant polyester and epoxy resin in a weight ratio of 1.0:0.8.

[0050] The foaming agent is foaming agent AC. The flame retardant is melamine cyanurate.

[0051] The plasticizer is propylene glycol methyl ether acetate.

[0052] The resin is composed of ethylene propylene diene monomer rubber, vinyl chloride vinyl acetate resin and methyl vinyl silicone rubber in a mass ratio of 0.6:2:1.3.

[0053] The lubricant is erucamide.

[0054] The organic sound absorber is composed of PLGA polymer microspheres, organic silicon rubber micropowder and composite micropowder in a mass ratio of 0.6:0.5:1.0.

[0055] The composite micropowder comprises the following raw materials in parts by weight: 30 parts of hollow silicone microspheres, 15 parts of acrylic resin, 5 parts of benzoin ethyl ether, and 2 parts of vinyl silane; the composite micropowder is prepared by the following method:

[0056] A1. Place the hollow silicone microspheres at the bottom of the fluidized bed reaction chamber and inject air from the gas inlet at the bottom of the fluidized bed reaction chamber to keep the hollow microspheres in a suspended state;

[0057] A2. According to parts by weight, acrylic resin, benzoin ethyl ether and vinyl silane are placed in a storage chamber at the upper part of the fluidized bed reaction chamber, sprayed into the fluidized bed reaction chamber through an atomizing nozzle, irradiated with an ultraviolet lamp, and cured to obtain composite micropowder.

[0058] The multi-layer sound absorbing and sound insulating material is prepared by the following steps:

[0059] S1. According to parts by weight, fibers, adhesives, foaming agents, flame retardants, plasticizers, resins, lubricants, organic sound absorbers, and antioxidants are mixed, kneaded, extruded, and pressed into sheets to obtain a composite sound material for later use;

[0060] S2, pressing the multi-layer composite sound material to obtain a sound absorbing material layer;

[0061] S3, processing the inner microporous sound absorbing layer, the vibration damping layer, the sound insulation board layer, the main frame layer, the sound absorbing material layer and the outer steel plate layer into sheets respectively;

[0062] S3. Coat a layer of adhesive on the surface of each layer of material, and bond each layer layer by layer through hot pressing to finally form a sound-absorbing and sound-insulating material.

[0063] Example 3

[0064] A multi-layer sound-absorbing and sound-insulating material comprises an inner microporous sound-absorbing layer, a vibration-reducing and damping layer, a sound-insulating board layer, a main frame layer, a sound-absorbing material layer and an outer steel plate layer which are sequentially arranged from the inside to the outside, wherein a plurality of hollow glass balls are evenly arranged in the main frame layer, and the sound-absorbing material layer is obtained by pressing together a plurality of multi-layer composite sound materials, wherein the composite sound material comprises the following raw materials in parts by weight: 15 parts of fiber, 8 parts of adhesive, 8 parts of foaming agent, 3 parts of flame retardant, 20 parts of plasticizer, 20 parts of resin, 3 parts of lubricant, 10 parts of organic sound-absorbing agent and 5 parts of antioxidant.

[0065] The fiber is a fiber formed by blending flame-retardant polyester fiber, PET fiber and flame-retardant polyester in a mass ratio of 0.8:1.2:1.0.

[0066] The adhesive is epoxy resin. The foaming agent is sodium carbonate.

[0067] The flame retardant is melamine polyphosphate and the plasticizer is paraffin oil.

[0068] The resin is composed of ethylene propylene diene monomer rubber, vinyl chloride vinyl acetate resin and methyl vinyl silicone rubber in a mass ratio of 0.8:3:1.5.

[0069] The lubricant is zinc stearate.

[0070] The organic sound absorber is composed of PLGA polymer microspheres, organic silicon rubber micropowder and composite micropowder in a mass ratio of 0.8:0.7:1.2.

[0071] The composite micropowder comprises the following raw materials in parts by weight: 40 parts of hollow silicone microspheres, 25 parts of acrylic resin, 7 parts of benzoin ethyl ether, and 3 parts of vinyl silane; the composite micropowder is prepared by the following method:

[0072] A1. Place the hollow silicone microspheres at the bottom of the fluidized bed reaction chamber and inject air from the gas inlet at the bottom of the fluidized bed reaction chamber to keep the hollow microspheres in a suspended state;

[0073] A2. According to parts by weight, acrylic resin, benzoin ethyl ether and vinyl silane are placed in a storage chamber at the upper part of the fluidized bed reaction chamber, sprayed into the fluidized bed reaction chamber through an atomizing nozzle, irradiated with an ultraviolet lamp, and cured to obtain composite micropowder.

[0074] The multi-layer sound absorbing and sound insulating material is prepared by the following steps:

[0075] S1. According to parts by weight, fibers, adhesives, foaming agents, flame retardants, plasticizers, resins, lubricants, organic sound absorbers, and antioxidants are mixed, kneaded, extruded, and pressed into sheets to obtain a composite sound material for later use;

[0076] S2, pressing the multi-layer composite sound material to obtain a sound absorbing material layer;

[0077] S3, processing the inner microporous sound absorbing layer, the vibration damping layer, the sound insulation board layer, the main frame layer, the sound absorbing material layer and the outer steel plate layer into sheets respectively;

[0078] S3. Coat a layer of adhesive on the surface of each layer of material, and bond each layer layer by layer through hot pressing to finally form a sound-absorbing and sound-insulating material.

[0079] Comparative Example 1

[0080] The difference between this comparative example and the above-mentioned Example 2 is that the raw material of the composite sound material of this comparative example does not contain an organic sound absorber but only uses PLGA polymer microspheres. The rest of the contents of this comparative example are the same as those of Example 2 and will not be described again.

[0081] Comparative Example 2

[0082] The difference between this comparative example and the above-mentioned embodiment 2 is that no fiber and adhesive are added to the raw materials of the composite acoustic material of this comparative example. The rest of the contents of this comparative example are the same as those of embodiment 2, and will not be repeated here.

[0083] The performance of the sound-absorbing and sound-insulating materials prepared by using the composite sound materials prepared by Example 2 and Comparative Examples 1-2 was tested, and the results are shown in Table 1:

[0084] Average sound absorption coefficient: tested in accordance with GB / T18696.1-2004 standard;

[0085] Perform sound insulation tests according to national standards.

[0086] Table 1

[0087]

[0088] It can be seen from Example 2 that the composite sound material prepared by the present invention has good sound absorption and sound insulation.

[0089] From the comparison between Example 2 and Comparative Examples 1-2, it can be seen that under the same conditions, the sound-absorbing and sound-insulating material obtained by adding an organic sound absorbent, fiber and adhesive composed of PLGA polymer microspheres, silicone rubber micropowder and composite micropowder into the formula has the advantages of better sound absorption and sound insulation, and has broad market prospects and application value.

[0090] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A multi-layer sound-absorbing and sound-insulating material, characterized in that: The invention comprises an inner microporous sound absorbing layer, a vibration damping layer, a sound insulation board layer, a main frame layer, a sound absorbing material layer and an outer steel plate layer which are arranged in sequence from the inside to the outside. A plurality of hollow glass balls are evenly arranged in the main frame layer. The sound absorbing material layer is obtained by pressing together multiple layers of composite sound materials. The composite sound materials comprise the following raw materials in parts by weight: 10-15 parts of fiber, 4-8 parts of adhesive, 3-8 parts of foaming agent, 1-3 parts of flame retardant, 10-20 parts of plasticizer, 10-20 parts of resin, 1-3 parts of lubricant, 5-10 parts of organic sound absorbing agent and 1-5 parts of antioxidant.

2. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The fiber is flame-retardant polyester fiber, PET fiber or fiber formed by blending rags and flame-retardant polyester.

3. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The adhesive is at least one of a silane coupling agent, a flame retardant polyester and an epoxy resin.

4. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The foaming agent is at least one of titanium hydride, foaming agent AC, and sodium carbonate.

5. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The flame retardant is at least one of antimony trioxide, melamine, melamine cyanurate, melamine polyphosphate, phosphazene and ammonium polyphosphate.

6. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The plasticizer is at least one of propylene glycol butyl ether, propylene glycol methyl ether acetate, paraffin oil, and dibutyl phthalate.

7. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The resin is composed of ethylene propylene diene monomer rubber, vinyl chloride vinyl acetate resin and methyl vinyl silicone rubber in a mass ratio of 0.4-0.8:1-3:1-1.

5.

8. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The lubricant is at least one of stearic acid, oleamide, erucamide, silicone powder, zinc stearate, calcium stearate, magnesium stearate, ethylene bis stearamide, and PE wax.

9. The multi-layer sound absorbing and sound insulating material according to claim 1, characterized in that: The organic sound absorber is at least one of polymethyl methacrylate PMMA powder, PLGA polymer microspheres, silicone rubber micropowder, composite micropowder, azine-based porous polymer, porous aromatic skeleton polymer, loofah and lotus leaf stem.

10. A method for preparing the multi-layer sound absorbing and sound insulating material according to any one of claims 1 to 9, characterized in that: The steps include: S1. According to parts by weight, fibers, adhesives, foaming agents, flame retardants, plasticizers, resins, lubricants, organic sound absorbers, and antioxidants are mixed, kneaded, extruded, and pressed into sheets to obtain a composite sound material for later use; S2, pressing the multi-layer composite sound material to obtain a sound absorbing material layer; S3, processing the inner microporous sound absorbing layer, the vibration damping layer, the sound insulation board layer, the main frame layer, the sound absorbing material layer and the outer steel plate layer into sheets respectively; S3. Coat a layer of adhesive on the surface of each layer of material, and bond each layer layer by layer through hot pressing to finally form a sound-absorbing and sound-insulating material.

Images