KR20100030277A - Sound-absorbing material and sound-proof wall employing it - Google Patents

Abstract

PURPOSE: A sound-absorbing material for a soundproof wall and a soundproof wall including the same are provided to have a sound absorbing function and to reduce a manufacturing cost by recycling waste materials. CONSTITUTION: A sound-absorbing material for a soundproof wall has a structure in which a waste aluminum chip(3) is dispersed within a thermoplastic resin matrix(1). The soundproof wall equipped with the sound-absorbing material for the soundproof wall is made of by arranging the sound absorbing material between a front plate and a rear plate.

Description

Sound-absorbing material for soundproof wall and soundproof wall equipped with the same {SOUND-ABSORBING MATERIAL AND SOUND-PROOF WALL EMPLOYING IT}

The present invention has excellent sound absorption characteristics and sound insulation properties, and there is an advantage in terms of eco-friendly and economical by using waste resources, soundproof walls that can prevent the noise between the floors of the apartment, sound absorbing material of sound room, soundproof walls for highway soundproof walls A sound absorbing material and a soundproof wall having the same.

Noise and vibration pollution is one of the most frequently encountered pollution in daily life, and it is equipped with soundproof walls to create a pleasant and quiet environment by preventing psychological, mental and physical stress and stress.

Soundproof walls are walls that are installed to block or reduce noise from outside, and are installed around highways, residential areas, schools, and public facilities.

These soundproof walls are made of materials that can absorb or block noise, and are largely divided into concrete soundproof walls, transparent soundproof walls, wooden soundproof walls, and metal soundproof walls.

Concrete soundproof wall is one of the typical soundproof walls that are still widely used, and has a structure that prevents sound propagation by reflecting noise. The concrete soundproof wall has a disadvantage of excellent durability and weather resistance but low sound absorption, and recently, a soundproof wall that has been provided with sound absorption by mixing cement and mineral wood fibers has recently appeared.

The transparent sound insulation wall has a form in which a plastic transparent plate is fixed to a frame, and reflects noise to exhibit sound insulation effect. The transparent sound insulation wall mainly uses polypropylene, and has excellent sound absorption and sound insulation, and can use various aesthetics and are easy to reuse. However, it is somewhat disadvantageous in terms of economics, and not only the careful design of the wind and the load, but also the problem that the sunshine right secured at the beginning of installation decreases as the transparency performance decreases with time.

The wood soundproof wall has a sound absorbing material embedded between the circumferential wood and the plate wood, and the sound absorbing material between the wood and the wood absorbs sound, and the soundproofing effect is excellent. The wood soundproof walls are environmentally friendly and have excellent sound absorption properties, but the metal soundproof walls are preferred in Japan and Korea because of the difficult maintenance.

Metal soundproof walls have the form of sound-absorbing materials (absorption panels or fillers) embedded in steel or aluminum plates. The soundproof walls are the most used sound-proof walls in Korea at present. Slit plate (1.0t) is used, and the back and side are mostly galvanized steel (1.6t).

As the sound absorbing material, foamed aluminum, polyester, polyester / polyurethane, wood, glass wool, rock wool, etc. are used, and have a difference in density and thickness.

Among them, foamed aluminum is restricted to use in a large area due to high manufacturing cost, but much research is being conducted due to excellent sound absorption properties.

Korean Patent Laid-Open Publication No. 1998-87558 discloses a sound absorbing material coated by rolling foamed aluminum to convert closed bubbles into open bubbles, and then forming various patterns on the surface.

Korean Patent Laid-Open Publication No. 1998-87553 proposes a sound absorbing material that bonds an aluminum thin plate into a hexagonal honeycomb shape to produce an aluminum honeycomb, and then forms a structural complex by bonding the foamed aluminum having a plurality of bubbles.

Korean Patent Laid-Open Publication No. 2007-20963 has been proposed for the production of sound-absorbing soundproof panels that are equipped with a foamed hole containing foamed aluminum to have excellent sound absorption and sound insulation, and to reduce production costs with little waste of materials.

In the case of glass wool as the sound absorbing material, environmental pollution is caused by the scattering dust of glass fiber or asbestos, which is mainly used, and in the case of wood, maintenance is difficult. Therefore, the sound absorption is not high compared to other fillers, but due to the low cost and excellent heat insulating properties and low dust, polyester / polyurethane fillers are mainly used.

In the case of polyester / polyurethane fillers, the fiber mixing process is performed, followed by a carding process through a damper, followed by molding, needle punching, and mixing with a binder for thermal fusion. It is manufactured through.

Korean Patent Publication No. 2002-39070 discloses a fibrous web containing low melting polyester fibers as a surface layer, and a three-dimensional fibrous web composed of high melting point and low melting polyester fibers as an inner layer, and a high melting polyester. It refers to a sound absorbing material of a multi-layered structure having a fibrous web containing fibers as a bottom layer.

In addition, studies on sound absorbing materials and sound barriers made of various materials have been actively conducted.

Korean Patent Publication No. 2008-42424 proposes a soundproof wall having a sound absorbing material in which a porous ceramic composition is filled in a dry state.

The prior art described above is a structural change or irregularities on the surface through simple bonding between fillers having different sound absorption properties, rather than the development of the material itself in manufacturing the sound absorbing material to improve the sound absorption characteristics of the soundproof wall. Joo tried to improve the sound absorption characteristics by diversifying the design of the product surface.

However, there is a limit to the improvement of sound absorption characteristics of the sound absorbing material through such structural or surface design changes, and it is not widely applied.

An object of the present invention for solving the above problems is to reduce the cost by using waste raw materials, to provide a sound absorbing material excellent sound absorption characteristics and sound insulation.

It is another object of the present invention to provide a soundproof wall provided with the sound absorbing material.

In order to achieve the above object, the present invention provides a sound absorbing material for soundproof walls in which waste aluminum chips are dispersed in a thermoplastic resin matrix.

Moreover, this invention provides the soundproof wall provided with the said sound absorption material.

Sound absorbing material according to the present invention is improved sound-absorbing properties and sound insulation, there is an environment-friendly and economical advantage by using waste resources. The sound absorbing material is applicable to soundproof walls that can prevent the noise between the floors of the apartment, sound absorbing materials of the sound room, highway soundproof walls and the like.

Hereinafter, the present invention will be described in more detail.

The soundproof wall is manufactured in consideration of the sound absorption point, which is the location receiving the most noise, and the production is made considering the sound absorption rate of how much sound can be absorbed and the insertion loss of how much the noise passing through the wall is reduced. Accordingly, the present invention is to provide a sound absorbing material and a soundproof wall having the same to ensure excellent sound absorption characteristics and sound insulation as well as economic advantages.

1 is a cross-sectional view showing the structure of a sound absorbing material according to the present invention.

Referring to FIG. 1, the sound absorbing material 10 has a structure in which waste aluminum chips 3 are dispersed in a thermoplastic resin matrix 1.

The thermoplastic resin matrix (1) can be used any material of the sound-absorbing material commonly used in this field, typically, a group consisting of polyester, polyethylene, polyurethane, copolymers thereof, and mixtures thereof. One species selected from is possible. Preferably polyester is used. The polyester is made of a fiber, and is a material that is harmless to humans, environmentally friendly, and has excellent performance such as heat insulation, self-extinguishing, recycling, etc., which is not weathered even after long exposure.

In particular, the present invention uses aluminum to improve the sound absorbing properties of the sound absorbing material 10 and to increase the sound insulating properties, such aluminum is not a conventional simple structural bonding, the waste aluminum chips are crushed into small chips having a predetermined size in the grinder. And then uniformly dispersed in the thermoplastic matrix 1.

Figure 2 is a schematic diagram showing the soundproofing mechanism of the sound absorbing material according to the present invention. Referring to FIG. 2, as the diffuse reflection of sound waves incident through the dispersed waste aluminum chip 3 occurs repeatedly, sound wave energy of noise is attenuated to generate a sound absorbing effect. ), The second and third sound absorption is achieved.

Preferably, the waste aluminum chip 3 is advantageous in terms of dispersing and sound absorption characteristics, which is pulverized to a size of 1 to 10 mm, and a chip of 5 mm was used in this experimental example. As the aluminum chip, it is possible to manufacture a soundproof wall at a lower cost by using waste aluminum chips.

The aluminum chip 3 is used in the range of 1.5 to 10 parts by volume with respect to 100 parts by volume of the thermoplastic resin matrix in the overall sound absorbing material 10 composition. If the content is less than the above range, it is impossible to expect sufficient improvement of sound absorption and sound insulation characteristics compared to the existing soundproof walls. On the contrary, if the content exceeds the above range, the filler may collapse down due to the gravity of the aluminum chip, and the manufacturing cost increases. Occurs.

The sound absorbing material according to the present invention has a noise reduction coefficient (NRC) defined as the average absorption ratio of absorption ratios at 250, 500, 1000, and 2000 Hz of 0.600 or more and 0.650.

Referring to the preferred experimental example 2, it was confirmed that the sound absorbing material in which the waste aluminum chip is dispersed shows excellent sound absorption and effect, and excellent in noise reduction effect compared to the sound absorbing material that is not.

In addition, the sound absorbing material further includes additives known in the art.

These additives may be binders (or adhesives), sound absorbing materials (glass wool, foamed aluminum, wood chips), flame retardants, dispersion aids and the like. For example, the binder is used to increase the adhesiveness between the thermoplastic resin and the waste aluminum chip, and an acrylic resin, a silicone resin, an epoxy resin, or the like that is commonly used may be used.

The sound absorbing material having such a composition is not particularly limited in the present invention, and for example, the sound absorbing material using the polyester sound absorbing material may be manufactured according to the method for producing the sound absorbing material.

Preferably, the sound absorbing material is

Uniformly dispersing the waste aluminum chip on the thermoplastic resin in the form of a fibrous web;

Forming a sound absorbing material by stacking a plurality of layers of the thermoplastic resin in the form of a fibrous web in which the waste aluminum chips are uniformly dispersed; And

It is prepared through a drying step.

The drying is typically carried out from several hours to several days at shaded room temperature.

The sound absorbing material according to the present invention thus produced is preferably used as the sound absorbing panel (or sound insulating material) of the soundproof wall.

3 is a cross-sectional view showing the structure of the sound barrier according to the present invention.

Referring to FIG. 3, the sound absorbing wall has a sound absorbing material 10 between the front plate 20 and the back plate 30.

The front and back plates 20 and 30 may be made of metal, plastic, tile, wood, and the like. For example, the front plate furnace 20 may be aluminum, and the back plate 30 may be a zinc steel plate. It is also possible to manufacture environmentally friendly plastics, preferably waste plastics, as needed.

Such a soundproof wall is not particularly limited in the present invention and may be manufactured according to a known method for a soundproof wall equipped with a sound absorbing material. Specifically, the obtained sound absorbing material is manufactured through the step of fixing after insertion between the front plate and the back plate.

The manufactured soundproof walls can be applied to soundproof walls that can prevent noise between floors in apartments, sound absorbing materials in sound rooms, and highway soundproof walls.

Hereinafter, preferred examples are provided to aid in understanding the present invention. However, the following examples are merely provided to more easily understand the present invention, and the contents of the present invention are not limited by the examples.

(Example 1)

The waste aluminum chips were made into chips having a size of about 5 mm through a mill. After dissolving 20 g of polyester (Atron) fibers used for the existing building to form a fibrous web, the waste aluminum chips thus prepared were uniformly dispersed. This was again stacked in several layers and formed into a sound absorbing material. At this time, the amount of waste aluminum chips contained in the sound absorbing material was 80 g (7 parts by volume) of 20 g of atron. The obtained mixture was dried to prepare a sound absorbing material having a dimension of Φ 10 cm × 5 cm (thickness).

(Example 2)

A sound absorbing material was prepared in the same manner as in Example 1, except that 40 g (3.5 parts by volume) of waste aluminum chips were used.

(Comparative Example 1)

A sound absorbing material was prepared in the same manner as in Example 1 without using waste aluminum chips.

Experimental Example 1

The cross section of the sound absorbing material prepared in Example 1 was cut to confirm the dispersion state of the waste aluminum chip.

Referring to Figure 4, it was confirmed that the waste aluminum chip is uniformly distributed and dispersed in the polyester matrix (fiber web).

Experimental Example 2

The change in sound absorption characteristics of the sound absorbing materials prepared in Example 1 and Comparative Example 1 was measured through the impedance tube method.

Sound absorption characteristic change measurement

Referring to FIG. 5, it can be seen that the sound absorbing material of Example 1 is improved by about 8% in the low frequency region of 250 to 2000 Hz, compared with the sound absorbing material of Comparative Example 1, which is conventionally used commercially.

Noise reduction coefficient measurement

Table 1 shows changes in noise reduction coefficients (NRC) of sound absorbing materials according to Example 1 and Comparative Example 1. FIG. The noise reduction coefficient is defined as the average of the absorption ratios at 250, 500, 1000 and 2000 Hz.

Example 1 Example 2 Comparative Example 1 Noise Reduction Factor 0.648 0.631 0.600

Referring to Table 1, in the case of the sound absorbing material (Examples 1 and 2) in which the waste aluminum chips are dispersed, the sound attenuation effect was better than that of the sound absorbing material (Comparative Example 1).

Sound absorbing material according to the present invention is available for all sound-proof wall fillers, including the existing polyester / polyurethane series, through which the sound-absorbing wall with improved sound-absorbing properties is possible, as well as sound-proof walls, acoustic rooms that can prevent the noise between the floors of the apartment It can be applied to sound-absorbing materials, highway soundproof walls, etc.

1 is a cross-sectional view showing the structure of a sound absorbing material according to the present invention.

Figure 2 is a schematic diagram showing the soundproofing mechanism of the sound absorbing material according to the present invention.

3 is a cross-sectional view showing the structure of the sound barrier according to the present invention.

Figure 4 is a photograph showing a cross section of the sound absorbing material prepared in Example 1.

5 is a graph showing the change in absorption ratio according to the frequency of the sound absorbing material of Example 1 and Comparative Example 1.

Claims (7)

A sound absorbing material for soundproof walls, in which waste aluminum chips are dispersed in a thermoplastic resin matrix. The method of claim 1, The sound absorbing material for sound barriers is sound absorbing material for soundproof walls comprising 1.5 to 10 parts by volume with respect to 100 parts by volume of the thermoplastic resin matrix. The method of claim 1, The thermoplastic resin is a sound-absorbing material for soundproof walls comprising one kind selected from the group consisting of polyester, polyethylene, polyurethane, copolymers thereof, and mixtures thereof. The method of claim 1, The waste aluminum chip has a size of 1 to 10 mm sound absorbing material for the soundproof wall. The method of claim 1, The sound absorbing material for the soundproof wall is a noise reduction coefficient (Nise) reduction coefficient (NRC) is 0.600 or more to 0.650 sound absorbing material for the soundproof wall. The method of claim 1, The sound absorbing material for the sound barrier comprises the steps of uniformly dispersing the waste aluminum chip on a thermoplastic resin in the form of a fibrous web; Forming a sound absorbing material by stacking a plurality of layers of the thermoplastic resin in the form of a fibrous web in which the waste aluminum chips are uniformly dispersed; And Sound absorbing material for a soundproof wall to be manufactured through a step of drying. Soundproof wall provided with a sound absorbing material according to claim 1.

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