CN218676461U - Multi-layer aerogel composite structure for sound insulation and sound attenuation of elastomer engineering equipment - Google Patents

Abstract

The utility model discloses a multilayer aerogel composite structure for sound insulation and noise elimination of elastomer engineering equipment, which comprises the following steps of firstly preparing an expanded polytetrafluoroethylene membrane and a silicon dioxide aerogel composite material respectively; then, forming and die-cutting the silicon dioxide aerogel composite material, packaging the silicon dioxide aerogel composite material by using a bulked polytetrafluoroethylene film, and packaging sound-absorbing cotton between the silicon dioxide aerogel composite material and the bulked polytetrafluoroethylene film; bonding the damping adhesive layer with the release paper layer protection on the other side of the silicon dioxide aerogel composite material; multilayer aerogel combined material is including the inflation polytetrafluoroethylene rete that bonds in proper order and pile up, inhale cotton layer of sound, aerogel combined material layer, damping glue film and leave type ply, can be used to the thin wall elastomer structure that elastomer engineering equipped. In this way, the utility model discloses can synthesize the improvement to the noise that the elastomer engineering was equipped to improve its inside passenger's travelling comfort, healthy and the life-span of equipping and the viability of low detection nature.

Description

Multi-layer aerogel composite structure for sound insulation and sound attenuation of elastomer engineering equipment

Technical Field

The utility model relates to a combined material technical field especially relates to a multilayer aerogel integrated configuration that is used for the sound insulation of elastomer engineering equipment to eliminate noise.

Background

Modern ships, airplanes, high-speed rail motor train unit carriages and the like are mostly engineering equipment with thin-wall elastomer structures, the elastomer engineering equipment has common weaknesses that self vibration and external environment loads (frictional resistance of wind, sea waves, fluid and the like) can generate huge noise energy, and the noise energy enables passengers in the ships, the airplanes, the high-speed rail motor train unit carriages and the like to be easily fatigued and to damage health, and also causes vibration fatigue fracture of the ships, the airplanes, the high-speed rail motor train unit carriages and the like or to be easily detected and attacked by hostile parties.

The harm of noise to the human body is systemic, and can cause changes of the auditory system and also have an influence on the non-auditory system: the early stages of these effects are mainly physiological changes, and the relatively intense noise of prolonged exposure can also cause pathological changes.

The porous sound absorption materials for solving the noise pollution at present mainly comprise polyurethane composite materials and porous fibers, and the polyurethane composite materials and the porous fibers aim to achieve good noise reduction effect in a wider frequency range. However, the conventional porous sound-absorbing material has drawbacks that cannot be compensated due to the requirements of multifunction and high energy efficiency. The reason is that the internal microstructure of the traditional sound absorption material is difficult to be accurately controlled through macroscopic operation, so that the energy transmission capacity is poor and the energy conversion efficiency is low.

In China, the aerogel has been applied to heat insulation and preservation of important parts of Chang' e airships, satellites, rockets, missiles, fighters and military vehicles, particularly aerospace military industry cabs or command rooms need to insulate heat, insulate sound and reduce noise, but the aerogel is not applied to engineering equipment with thin-wall elastomer structures such as ships, airplanes and high-speed rail motor train unit carriages at present. And the method is obviously not enough in the aspect of complex elastomer engineering equipment only by using a single aerogel material, and the low-noise effect of the elastomer engineering equipment can be achieved only by comprehensive treatment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem of main solution provides a multilayer aerogel integrated configuration that is used for the sound insulation of elastomer engineering equipment to eliminate the noise, equip the damping glue film of vibration, have the strong syllable-dividing aerogel combined material layer of low sound velocity, the full frequency of ePTFE membrane micropore of strong sound absorption is inhaled the cotton material etc. and is constituteed by reducing the elastomer engineering, can synthesize the treatment to the noise that the elastomer engineering was equipped to improve its inside passenger's travelling comfort, healthy life-span and the low survivability of exploratory ability of equipping.

For solving the technical problem, the utility model discloses a another technical scheme is: there is provided a multilayer aerogel composite structure for sound insulation and sound attenuation of elastomeric engineering equipment, comprising:

the full-frequency sound-absorbing cotton layer is formed by attaching and connecting an expanded polytetrafluoroethylene film layer to one side surface of the sound-absorbing cotton layer;

the aerogel composite material layer is attached to and connected with the other side face of the sound-absorbing cotton layer;

the damping adhesive layer is attached to the other side face of the aerogel composite material layer;

and the release paper layer is attached to cover the other side surface of the damping adhesive layer.

In a preferred embodiment of the present invention, the shape of the combination structure can be a flat and thin cylinder, a rectangular parallelepiped or a special-shaped body.

In a preferred embodiment of the present invention, the damping adhesive layer with the release paper layer protection, the silica aerogel composite material and the full-frequency sound-absorbing cotton layer are bonded one by one through the pressure sensitive adhesive layer and stacked.

The utility model has the advantages that: the sound absorption performance is good, the acoustic performance is stable, no pollution, the weight is light, the appearance is attractive, the fireproof performance, the heat insulation and the heat preservation performance are realized, the physical performance is good, the processing is easy, and the sound absorption material can be made into various types of sound absorbers, silencers, sound insulation structures, sound barriers, sound deadening rooms, sound insulation covers and the like, can directly face a noise source, and does not need any protective panels or other sound absorption fillers;

has excellent acoustic performance: the average sound absorption coefficient is more than or equal to 0.80 (frequency range of 125-4000 Hz), and the sound absorption performance is not changed after water spraying and ash spraying;

the aerogel sound insulation and absorption material is made of high-purity silicon dioxide, is the closest material to nature, and does not cause secondary pollution to the environment;

the aerogel sound insulation and absorption material has fire resistance, incombustibility, weather resistance, corrosion resistance and ageing resistance, can withstand wind, rain and sunlight, and belongs to A-grade incombustible products;

the aerogel sound insulation and absorption material can be sawed, bonded, riveted and inserted at will, and is convenient to install;

the aerogel sound insulation and absorption material can be made into sound absorbers in various forms, and can also be combined into sound absorbers and sound insulators in various forms;

the aerogel sound insulation and absorption material can perform the functions of sound absorption, sound insulation and sound elimination in equipment such as diesel engines, generators, motors, internal combustion engines, refrigerators, air compressors, airplanes, trains, automobiles, ships, boilers, forging hammer equipment, fans and the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

FIG. 1 is a schematic structural view of a preferred embodiment of the multi-layer aerogel composite structure for sound insulation and sound attenuation of elastomer engineering equipment according to the present invention;

FIG. 2 is a graph of the sound insulation of a silica aerogel blanket of the present invention;

FIG. 3 is a scanning electron microscope image of the noise isolated silica aerogel composite micropore;

the parts in the drawings are numbered as follows: 100. the composite material comprises an expanded polytetrafluoroethylene film layer, 200 parts of an acoustic cotton layer, 300 parts of an aerogel composite material layer, 400 parts of a damping adhesive layer and 500 parts of a release paper layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front" and "rear" and the like are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are conventionally placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to be referred must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature may be over, above or on the second feature including the first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Referring to fig. 1 to 3, an embodiment of the present invention includes:

a multi-layer aerogel composite structure for sound insulation and sound attenuation of elastomeric engineering equipment, comprising: inhale cotton layer, aerogel combined material layer 300, damping glue film 400 and leave type ply 500 all the way, inhale the cotton layer of sound by the laminating of expanded polytetrafluoroethylene rete 100 and connect and form in one of them side of inhaling cotton layer 200 all the way, aerogel combined material layer 300 laminating is connected and is inhaled the relative another side in cotton layer 200, and this damping glue film 400 laminating is connected in the another side of aerogel combined material layer 300, leaves the another side that the ply 500 laminating covers damping glue film 400.

The core of the expanded polytetrafluoroethylene membrane is as follows: mixing polytetrafluoroethylene dispersion resin with liquid extrusion aid and coloring agent in proportion, aging at 32 deg.C, pre-pressing into column blank, making the column blank into thin sheet by calendering, heating to remove extrusion aid, unidirectional stretching, bidirectional stretching, heat setting, cooling and rolling to obtain the expanded polytetrafluoroethylene microporous film.

The manufacturing process of the silica aerogel composite material for insulating noise comprises the following steps: hydrolyzing silane in alcohol water to prepare silica sol, adding an alkaline catalyst into the silica sol, stirring to obtain silica sol, soaking a glass fiber felt in the silica sol, carrying out gel aging on the glass fiber felt soaked with the silica sol to obtain a silica gel composite material, completely soaking the aged silica gel composite material with a solvent for solvent replacement, and then adopting CO to carry out solvent replacement on the silica gel composite material ₂ And (4) performing supercritical drying in a supercritical drying mode, and completely drying to obtain the product.

The utility model discloses in, the damping glue layer 400, silica aerogel combined material layer 300 and the full sound cotton layer of inhaling of area from the protection of release paper layer 500 bond one by one through pressure sensitive adhesive layer and pile up. Wherein, release paper layer 500 is PET release paper, protects this multilayer aerogel integrated configuration who gives sound insulation and eliminates noise with PET release paper before the use, has both made things convenient for mass production, is convenient for again to store transportation and customer's use.

The utility model discloses in, integrated configuration can have various shapes, with actual application looks adaptation, can be flat thin cylindric, cuboid form or with special-shaped form etc..

The utility model discloses still relate to the preparation method that is used for the multilayer aerogel integrated configuration of the sound insulation of elastomer engineering equipment to eliminate noise:

firstly, preparing a bulk polytetrafluoroethylene membrane and a silicon dioxide aerogel composite material respectively; then, the silicon dioxide aerogel composite material is molded and die-cut, and is packaged by the expanded polytetrafluoroethylene film, and the sound-absorbing cotton is packaged between the silicon dioxide aerogel composite material and the expanded polytetrafluoroethylene film during packaging; and bonding the damping adhesive layer with the release paper layer protection on the other side of the silicon dioxide aerogel composite material, lightly pressing for a period of time, and then inspecting, packaging and delivering for use.

The method specifically comprises the following steps:

a. preparing a bulked polytetrafluoroethylene membrane:

mixing the PTFE dispersion resin with liquid extrusion aid and coloring agent in proportion, aging at 32 deg.C, pre-pressing into cylinder blank, making the cylinder blank into sheet by calendering, heating to remove the extrusion aid, unidirectional stretching, bidirectional stretching, heat setting, cooling and rolling to obtain expanded PTFE microporous film, and transferring to the next process.

b. Preparation of silica aerogel composite:

hydrolyzing silane in alcohol water to prepare silica sol, adding an alkaline catalyst into the silica sol, stirring to obtain silica sol, soaking a glass fiber felt in the silica sol, carrying out gel aging on the glass fiber felt soaked with the silica sol to obtain a silica gel composite material, completely soaking the aged silica gel composite material with a solvent for solvent replacement, then carrying out supercritical drying in a CO2 supercritical drying mode, and completely drying to obtain the noise-isolated silica aerogel composite material.

c. The preparation of the silicon dioxide aerogel composite material with sound insulation and strong noise reduction comprises the following steps:

and (c) forming and die-cutting the silica aerogel composite material which is prepared in the step (b) and is used for isolating the noise, bonding the silica aerogel composite material with the sound absorption cotton layer, packaging the expanded polytetrafluoroethylene film in the step (a), packaging the sound absorption cotton between the silica aerogel composite material and the expanded polytetrafluoroethylene film during packaging, and detecting and packaging.

d. Stacking of sound-damping multilayer aerogel composite:

the damping adhesive layer with the release paper layer protection, the silicon dioxide aerogel composite material layer, the sound absorption cotton layer and the polytetrafluoroethylene film layer which are packaged together are bonded and stacked one by adopting pressure-sensitive adhesive, then lightly pressed for 10min, and then inspected, packaged and delivered for engineering use.

The utility model discloses in can completely cut off the silica aerogel combined material layer of noise the experimental data in the aspect of giving sound insulation as follows:

1. sound insulation test standard: the 2 nd part transfer function method for measuring the sound absorption coefficient and the sound impedance in the reference GBT 18696.2-2002 acoustic impedance tube;

description of the test:

a) The sample sizes phi 100mm and phi 30mm are overlapped by flat plates with the thickness of 4 mm;

b) Phi 100mm testing frequency is 50hz-1600hz; phi 30mm testing frequency is 800hz-6300hz;

c) The thickness is respectively tested as follows: 2/2+2/4/8/12/16/20/24/28/30mm (stacked by 2mm or 4mm thick plates) sample number: 20pcs;

2. sound insulation test results: the sound values for a 90dB standard noise source isolated after sound insulation by silica aerogel blanket flats are given in the following table:

silica aerogel is an ideal acoustic delay or high temperature resistant insulation due to its low sound velocity characteristics. The silicon dioxide aerogel is filled with nanopores with two open ends and communicated with the surface, the specific surface area of the silica aerogel is as high as 900 to 1000m < 2 >/g, the number of the nanopores is very large, and therefore when sound is transmitted in the silica aerogel, sound energy is greatly consumed by the wall of the nanopores in large quantity, and the aerogel has a sound absorption effect which is ten times higher than that of a common porous material.

The silica aerogel glass fiber felt is an ideal material for sound absorption, sound insulation and noise reduction in ships, and in addition, the aerogel is very good in thermal stability and corrosion resistant, and the aerogel subjected to surface treatment is hydrophobic, so that the silica aerogel glass fiber felt still has good sound absorption and insulation performance under extremely high temperature and severe corrosive environments.

The utility model discloses a by reducing the elastomer engineering equipment vibration damping glue film, have the strong syllable-dividing silica aerogel combined material layer of low sound velocity, the full frequency of the inflation polytetrafluoroethylene membrane micropore of strong sound absorption is inhaled cotton material etc. and is constituteed, has reached following technical index through above-mentioned preparation method:

the normal-temperature heat conductivity coefficient of the multilayer aerogel composite material is less than 0.02w/m.k; the density of the silica aerogel composite material for insulating noise is less than 300Kg/m < 3 >; when the thickness of the silicon dioxide aerogel composite material for isolating noise is 2mm, the sound insulation decibels of each frequency point are as follows: 50Hz to 200Hz, and the sound insulation quantity is more than 6dB;630Hz to 6300Hz, and the sound insulation quantity is more than 11dB; the flame retardant UL94 of the noise insulating silica aerogel composite is V0 grade.

The utility model discloses still relate to the application that is used for the multilayer aerogel integrated configuration of the sound insulation noise elimination that the elastomer engineering was equipped, this combined material is applied to the elastomer engineering and is equipped, including diesel engine, generator, motor, internal-combustion engine, refrigerator, air compressor machine, aircraft, train, car, boats and ships, boiler, forging hammer equipment, thin wall elastomer such as fan structural.

The utility model discloses utilize aerogel excellent properties such as thermal-insulated, hydrophobic, fire-retardant, seek the breakthrough in acoustics application field, because the adiabatic felt of aerogel has excellent thermal insulation performance, hydrophobic performance, fire behaviour, the acoustic celotex board of making an uproar falls in aerogel has had outstanding thermal insulation performance, hydrophobic self-cleaning performance and fire behaviour concurrently. The innovation of the aerogel sound insulation and absorption material is embodied in the following points:

the sound absorption performance is good, the acoustic performance is stable, the pollution is free, the weight is light, the appearance is attractive, the fireproof performance, the heat insulation and the heat preservation performance are realized, the water resistance is realized, the physical performance is good, the processing is easy, the sound absorption body, the silencer, the sound insulation structure, the sound barrier, the sound attenuation room, the sound insulation cover and the like in various forms can be manufactured by using the sound absorption body, the silencer, the sound insulation structure, the sound insulation cover, the sound attenuation room, the sound insulation cover and the like, the noise source can directly face to, and any protective panel and other sound absorption fillers are not needed;

has excellent acoustic performance: the average sound absorption coefficient is more than or equal to 0.80 (frequency range of 125-4000 Hz), and the sound absorption performance is not changed after water spraying and ash spraying;

the aerogel sound insulation and absorption material is made of high-purity silicon dioxide, is the closest material to the nature and does not cause secondary pollution to the environment;

the aerogel sound insulation and absorption material has fire resistance, non-inflammability, weather resistance, corrosion resistance and ageing resistance, can stand up to wind, rain and sun, and belongs to A-grade non-combustible products;

the aerogel sound insulation and absorption material can be sawed, bonded, riveted and inserted at will, and is convenient to install;

the aerogel sound insulation and absorption material can be made into sound absorbers in various forms, and can also be combined into sound absorbers and sound insulators in various forms;

the aerogel sound insulation and absorption material can perform the functions of sound absorption, sound insulation and sound elimination in equipment such as diesel engines, generators, motors, internal combustion engines, refrigerators, air compressors, airplanes, trains, automobiles, ships, boilers, forging hammer equipment, fans and the like.

The multilayer aerogel composite structure for sound insulation and noise elimination of elastomer engineering equipment and the preparation method and application thereof have the beneficial effects that:

by reducing the damping glue layer of elastomer engineering equipment vibration, have the aerogel composite layer that the low sound velocity is strong gives sound insulation, the full frequency of ePTFE membrane micropore sound absorption cotton material of strong sound absorption etc. constitute, the noise of equipping is synthesized and is administered to the elastomer engineering to improve its inside passenger's travelling comfort, healthy and the life-span of equipment and the low detectability's viability.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.

Claims (3)

1. A multi-layer aerogel composite structure for sound insulation and sound attenuation of elastomer engineering equipment, comprising:

the full-frequency sound-absorbing cotton layer is formed by attaching and connecting an expanded polytetrafluoroethylene film layer to one side surface of the sound-absorbing cotton layer;

the aerogel composite material layer is attached to and connected with the other side face of the sound-absorbing cotton layer;

the damping adhesive layer is attached to the other side face of the aerogel composite material layer;

and the release paper layer is attached to cover the other side surface of the damping adhesive layer.

2. The multi-layer aerogel composite structure for sound insulation and sound attenuation of elastomer engineering equipment as claimed in claim 1, wherein the shape of the composite structure can be a flat thin cylinder, a rectangular parallelepiped or a profile.

3. The multi-layer aerogel composite structure for sound insulation and sound attenuation of elastomer engineering equipment as claimed in claim 1, wherein the damping glue layer with release paper layer protection, silica aerogel composite material and full-frequency sound-absorbing cotton layer are bonded and stacked one by one through pressure sensitive glue layer.

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