KR101911790B1 - Laminate for sound insulation - Google Patents

Abstract

The present invention relates to a negative pressure laminated body comprising a porous expanded polyolefin layer and a foamed polyurethane layer in which polyolefin expanded particles containing through-pores are pressed, and in the case of the negative pressure laminated body according to the present invention, This is a remarkably high feature.

Description

Laminate for sound insulation < RTI ID = 0.0 >

The present invention relates to a negative film laminate including a porous expanded polyolefin layer and a foamed polyurethane layer on which polyolefin expanded particles containing through-pores are pressed.

Recently, housing types such as high - rise apartments occupy a large proportion according to the tendency of the buildings to be high - rise due to the densification of residential space and the development of building technology. In order to reduce the weight and construction cost of such a high-rise building, there is a tendency to reduce the thickness of the floor dividing each floor within the range of securing the stability of the building.

In particular, in the case of a residential building, living noise and vibration are inevitably generated due to daily living in a residential area, and it becomes difficult to sufficiently block such living noise and vibration as the floor tends to become thinner. This noise may also lead to social problems.

In order to solve this problem, it is recommended that construction of a certified floor structure or a standard floor structure is recommended in order to prevent noise and vibration at a level higher than a certain level when constructing a apartment house. However, in such a structure, There is a problem that the sound absorbing performance is relatively inferior to the thickness so that it is not efficient.

Various sound insulating materials, floor structures, and construction methods have been researched and developed in order to solve such problems and efficiently block the interlayer noise at a low cost. For example, Korean Patent No. 10-1283575 discloses a soundproofing material for reducing interlayer noise by mixing multi-walled carbon nanotubes. However, in the case of using multi-walled carbon nanotubes, There is a problem.

Korean Patent No. 10-1283575

An object of the present invention is to provide a negative laminated body which exhibits excellent sound insulation performance and is thin in thickness.

Another object of the present invention is to provide a car sound-absorbing laminate excellent in tone difference using a porous foamed polyolefin layer.

It is still another object of the present invention to provide a sound absorbing laminate including a foamed polyurethane layer capable of absorbing vibration as well as sound.

It is still another object of the present invention to provide a negative film laminate which exhibits excellent sound insulation performance at low cost.

The negative laminated body according to the present invention comprises a porous expanded polyolefin layer and a foamed polyurethane layer on which polyolefin expanded particles containing through-pores are pressed.

In the negative laminate according to an embodiment of the present invention, the polyolefin may be polypropylene.

In the car sounding laminate according to an embodiment of the present invention, the foamed polyurethane layer may be foamed in the form of a closed cell.

In the car sounding laminate according to an embodiment of the present invention, the thickness ratio of the porous foamed olefin layer: foamed polyurethane layer may be 1: 0.3 to 2.

The polyolefin expanded particles including the through pores in the negative laminate according to an embodiment of the present invention may be cylindrical or polygonal.

In the negative laminated body according to an embodiment of the present invention, the porous expanded polyolefin layer may have an apparent density of 25 to 45 g / cm 3.

In the negative pressure laminate according to an embodiment of the present invention, the apparent density of the foamed polyurethane layer may be 50 to 350 g / cm 3.

The car wall laminate according to an embodiment of the present invention may include a first porous foam polyolefin layer, a foamed polyurethane layer, and a second porous foamed polyolefin layer sequentially.

The present invention provides a method of constructing a car sounding laminate, comprising: laminating a car sounding laminate according to the present invention on a floor surface; And

And placing the cement mortar on the laminate.

The present invention also provides a method for shielding noise at a frequency of 700 Hz or less using a laminated body for a car according to an embodiment of the present invention, wherein the foamed polyurethane layer is disposed adjacent to a noise source .

The present invention also provides a noise shielding method of a frequency of 1000 Hz or more using the car sounding laminate according to an embodiment of the present invention, wherein the porous foamed polyolefin layer is disposed adjacent to the noise source have.

The present invention has an advantage of exhibiting excellent sound insulation performance even at a relatively low cost with a thin thickness, including a porous expanded polyolefin layer and a foamed polyurethane layer formed with through pores.

The present invention is advantageous in that the polyolefin expanded particles including through-pores include a porous foamed polyolefin layer on which the expanded polyolefin expanded particles are squeezed, so that the sound insulation effect is excellent.

The car sound-absorbing laminate of the present invention has an advantage that it can block sound as well as vibration by including a foamed polyurethane layer.

Fig. 1 is a photograph of a porous expanded polyolefin layer (left), a foamed polyurethane layer (right), and a laminate (below) laminated thereon according to an embodiment of the present invention.
FIG. 2 is a graph showing the difference in tone according to frequencies of a car sounding laminate according to Examples and Comparative Examples of the present invention. FIG.
FIG. 3 is a diagram showing a difference tone according to frequency of a car sounding laminate according to an embodiment of the present invention in the order of lamination.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a car-receiving laminate according to the present invention will be described in detail with reference to the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the following drawings may be exaggerated in order to clarify the spirit of the present invention. Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

According to the present invention,

A porous expanded polyolefin layer on which polyolefin expanded particles including through-pores are pressed; And a foamed polyurethane layer. In the case of the laminated body for a car according to the present invention, the sound insulation efficiency is remarkably high as compared with the conventional product. Specifically, the car sound-absorbing laminate according to one embodiment of the present invention has an excellent advantage in blocking the difference in tone and vibration, so that the thickness of the floor layer is not excessively increased due to the excellent sound tone of the same thickness, There is an advantage that the sound insulation efficiency can be secured.

Hereinafter, the term "tone pitch" as used in the specification of the present invention refers to a ratio of a sound volume to a sound volume after passing through a sound insulating material or a sound receiving laminate, Refers to a tone difference in a sound insulating material or a sound absorbing laminate at a thickness of 50 mm or less, specifically 30 to 40 mm, unless otherwise specified.

The negative laminated body according to the present invention includes a porous expanded polyolefin layer on which polyolefin expanded particles containing through-pores are squeezed. Unlike the sound insulating material in which the polyolefin is foamed by the conventional method, by using the expanded particles including the through-hole pores, the sound insulating performance can be remarkably improved while the weight is further reduced.

Specifically, the polyolefin may be one or more selected from resin compositions comprising high-density polyethylene, medium-density polyethylene, low-density polyethylene and linear low-density polyethylene, and alpha-olefin block copolymers having 3 to 15 carbon atoms, Or a polyolefin resin containing 80% by weight or more of polypropylene. In the case of producing a laminate by foaming a polyolefin resin containing 80% by weight or more of polypropylene, the weight of the laminate can be reduced to a low specific gravity of 0.895 to 0.92 due to the characteristics of the polypropylene material, In addition to having strength and high resistance to fatigue failure, it is possible to compensate for the excessively flexible mechanical properties of the soft foam polymer layer included in the laminate. In particular, since the polypropylene layer is laminated with the soft foamed polymer layer, the durability of the laminated body can be improved and the effect of the sound insulating material described later can be remarkably improved. Thus, the remarkable mechanical characteristics and sound insulating properties can do.

In addition, the porous polyolefin layer according to the present invention may be in the form of compressed polyolefin expanded particles containing through-pores. Since the porous polyolefin layer according to the present invention has such a shape, when foamed particles of general foam or other shapes are formed by pressing, there is an advantage that the contrast effect against the sound is remarkably excellent. Specifically, the ratio of the area occupied by the through pores in the end face of the expanded particles may be 50 to 95%. When the area of the through pores in the expanded particles is in the above range, the ratio of 15% Or more. ≪ / RTI >

Specifically, the polyolefin foam particles including the through-hole pores according to an embodiment of the present invention may be spherical, cylindrical, or polygonal. In this case, the polygonal shape of the bottom of the polygonal shape includes 3 to 20 edges But is not limited thereto. More specifically, the polyolefin expanded particles containing the through-pores according to an embodiment of the present invention may be cylindrical in terms of forming voids of 3 to 10% after molding and compression. The shape of the through-hole pores in the expanded bead is not limited as long as the ratio of the area occupied by the end face is satisfied, but specifically, it may be a cylindrical shape.

Further, the expanded particles according to an embodiment of the present invention may have a length of 2 to 20 mm, and the longest diameter on the end face of the expanded particles may be 0.3 to 2 times the length of the expanded particles. Preferably, the expanded particles have a length of 2 to 10 mm and the longest diameter at the end face is 2 to 8 mm in order to secure sufficient intergranular voids and to exhibit a uniform tone after compression.

The porous foamed polyolefin layer according to one embodiment of the present invention comprises: forming a polyolefin-based resin composition containing a foaming agent into a shape including through-pores; Foaming the polyolefin to produce expanded particles; And compressing the foamed expanded particles.

That is, the expanded particles as used in the present invention means particles after foaming formed by foaming a resin material containing a foaming agent. Further, the porous foamed polyolefin layer may have an apparent density of 25 to 45 g / cm 3, and foaming and compression of the polyolefin may be performed within a range satisfying the apparent density.

The battery pack laminated body according to the present invention can remarkably improve not only the impact but also the vibration absorbing power by including the foamed polyurethane layer. Specifically, the foamed polyurethane layer is made of thermoplastic polyurethane (TPU) Or may be formed by foaming. When the thermoplastic expanded polyurethane is foamed to be used for a negative laminated body, it is easy to mold and is excellent in wear resistance, and it is advantageous in that an improved sound insulation effect can be achieved by laminating it on the porous foamed polyolefin layer.

Further, in the car sounding laminate according to the present invention, the foamed polyurethane layer may be foamed in the form of a closed cell. In this case, the closed cell means a foamed form including closed pores formed by trapping the foamed gas in a cell when the polyurethane is foamed. When the foamed polyurethane layer is foamed into a closed cell, The contrast mechanical strength and the buffering ability are remarkably improved, which is more suitable for a sound insulating material for construction.

The foamed polyurethane layer according to an embodiment of the present invention may be formed by foaming a thermoplastic polyurethane bead containing a foaming agent and the apparent density of the foamed polyurethane layer formed by foaming is 50 to 350 g / , More specifically 70 to 220 g / cm < 3 >, and the content of the foaming agent contained in the polyurethane beads is not limited as long as the content of foaming agent satisfies the above-mentioned apparent density after foaming.

According to one embodiment of the present invention, the car sounding laminate includes the porous expanded polyolefin layer and the foamed polyurethane layer, and the laminated structure is advantageous in that a sound insulation effect and a buffer effect against vibration can be achieved. Specifically, the porous foamed olefin layer according to one embodiment of the present invention: the thickness ratio of the foamed polyurethane layer is 1: 0.3 to 2, specifically 1: 0.3 to 1.1, more specifically 1: 0.3 to 0.7 Lt; / RTI > When the thickness ratio of the porous expanded polyolefin layer and the foamed polyurethane layer is within the above range, it is possible to exhibit a high efficiency sound insulation effect even with a relatively thin thickness.

Specifically, when the thickness ratio of the porous expanded polyolefin layer and the foamed polyurethane layer is in the above-mentioned range, the car sounding laminate according to the present invention has a thickness of 50 mm or more, specifically 30 to 40 mm in the range of 1200 to 10000 Hz, The following expression (1) can be satisfied even when the tone rate is 25% or more.

[Formula 1]

은 주파수 1250 ㎐의 차음률이며,

는 1200 내지 10000 ㎐ 범위에서 임의로 선택된 한 주파수에서의 차음률이다.

Is a difference in tone at a frequency of 1250 Hz,

Is a difference in tone at a frequency arbitrarily selected from the range of 1200 to 10000 Hz.

That is, the car sounding laminate according to an embodiment of the present invention has a difference ratio of 25% or more for one arbitrary frequency selected in the range of 1200 to 10000 Hz, and a difference ratio of 1250 Hz 70% or more, and more specifically, 80 to 130% of the darkness of the light in the light source. This means that the car sounding laminate according to an embodiment of the present invention exhibits a relatively uniform sound tone in the above range. As described above in the above-mentioned range, even when the high differential ratio is exhibited, the differential tone ratio at each frequency is uniform, and various types of noise can be blocked when used as an actual sound insulating material.

Further, the thickness after lamination of the car sound layered product according to an embodiment of the present invention may vary depending on the actual installation process such as the desired pitch difference and the thickness that can be applied, but it is specifically 10 to 100 mm, more specifically 15 To 50 mm.

Specifically, the car sounding laminate according to one embodiment of the present invention is characterized in that the porous foamed polyolefin layer is laminated on the foamed polyurethane layer and the porous foamed polyolefin layer is disposed on the upper layer so that sound and vibration transmitted from the upper layer to the lower layer Can be blocked. Specifically, according to one embodiment of the present invention, the porous foamed polyolefin layer is located on the upper layer and may be adjacent to the noise source. In this case, in the range of 1000 Hz or more, more specifically 1000 to 10000 Hz Sound insulation may be particularly efficient. Specifically, when the upper layer in the above frequency range is a porous expanded polyolefin layer, the differential tone may be 20% or more. Furthermore, when the thickness ratio of the porous expanded polyolefin layer: foamed polyurethane layer is 1: 0.3 to 0.7, the difference ratio in the frequency range may be 25% or more.

The car sounding laminate according to an embodiment of the present invention may also be constructed by laminating a foamed polyurethane layer on a porous foamed polyolefin layer and blocking sound or noise transmitted from the upper layer to the lower layer by locating the foamed polyurethane layer on the upper layer have. Specifically, in the car sounding laminate according to the embodiment of the present invention, the foamed polyurethane layer is located on the upper layer and may be adjacent to the noise source. In this case, the frequency of the noise source is 700 Hz or less, more specifically 400 to 700 Hz Lt; / RTI > may be particularly efficient. In detail, in the conventional sound insulating materials or sound absorbing laminates, many prior arts for blocking noise of a relatively high frequency have been disclosed, but there have been many difficulties in blocking low frequency noise. However, when the foamed polyurethane layer is laminated on the upper layer in the laminated body for a car according to an embodiment of the present invention, the difference ratio may be 10% or more in the frequency range, and the average difference ratio may be 15% It is possible to block noise of a relatively low frequency with remarkably high efficiency.

Furthermore, in order to block noise in a wide frequency range, the car sounding laminate according to an embodiment of the present invention may have three or more layers of the porous expanded polyolefin layer and the foamed polyurethane layer. More specifically, the porous foamed polyolefin layer and the foamed polyurethane layer can be alternately stacked, and preferably, when used as a sound insulating material for a building, a first mechanical strength is imparted to a structure and a first A porous foamed polyolefin layer, a foamed polyurethane layer, and a second porous foamed polyolefin layer are sequentially laminated.

The car sound-absorbing laminate according to an embodiment of the present invention includes a wet type It is possible to use a method of simply laminating and bonding them at the time of the process or dry process, or a method of bonding the porous expanded polyolefin layer and the foamed polyurethane layer by using an adhesive. Specifically, when bonding is performed using an adhesive, two or more layers included in the laminate may be bonded with a hot-melt adhesive. As the hot melt adhesive, an EVA adhesive (molar% of vinyl acetate repeating units: 18 to 40%, a melt index of 2 to 200), an ethylene acrylic adhesive, an amorphous polypropylene adhesive (weight average molecular weight: 3,000 to 10,000) and a polyurethane- And may be one or more selected. The reactive polyurethane-based adhesive may be used in the form of a one-component or two-component adhesive. The component 1 or 2 is melted at a high temperature and applied to the application surface Two or more layers may be combined and cured. The respective layers are bonded to each other through the hot melt adhesive, so that it is possible to maintain the shape of the laminated body at the time of construction and to improve the mechanical properties and sound insulation characteristics.

The car sounding laminate according to one embodiment of the present invention can be used for building or automobile, and more specifically, can be used as a sound insulating material for construction. In the case of using the sound insulation laminate according to one embodiment of the present invention for construction, a laminate can be used in the construction step, more specifically, a laminate according to an embodiment of the present invention, It is possible to construct by laminating.

The present invention also provides a method of constructing a car sounding laminate according to an embodiment of the present invention. Specifically, a method of constructing a car sound layered product according to an embodiment of the present invention includes: stacking a car sound layered product on a floor surface to be laminated; And placing the cement mortar on the laminate. When the car sounding laminate according to one embodiment of the present invention is installed in this manner, it is not necessary to use a compound for fixation such as a separate adhesive or the like, but is laminated under the cement layer or between the cement layers, It is possible to remarkably improve the sound insulation efficiency of the speaker. At this time, as described above, the porous expanded polyolefin may be laminated on the upper layer or laminated on the lower layer according to the type of noise to be sounded. Further, in order to interpose the car sounding laminate in the cement layer, a construction method in which a part of the cement mortar is laid, the laminate according to one embodiment of the present invention is laminated, and the cement mortar is laid on the laminate Of course it is.

Further, the present invention also provides a noise shielding method for shielding noise of 700 Hz or less using the car sounding laminate according to an embodiment of the present invention. In order to shield the noise in the above range, the sound insulation laminate according to an embodiment of the present invention may shield the noise by arranging the foamed polyurethane layer adjacent to the noise source. Specifically, by laminating the porous expanded polyolefin layers according to an embodiment of the present invention and laminating a foamed polyurethane layer on the porous expanded polyolefin layer, noise in the frequency range transmitted from the upper layer to the lower layer can be easily blocked .

The present invention also provides a noise shielding method for shielding noises of 1000 Hz or more using the car sounding laminate according to one embodiment of the present invention. In order to shield the noise in the above range, the sound-receiving laminate according to one embodiment of the present invention can shield the noise by arranging the porous expanded polyolefin layer adjacent to the noise source. Specifically, by laminating the foamed polyurethane layers according to an embodiment of the present invention and laminating a porous expanded polyolefin layer on the foamed polyurethane layer, noise in the frequency range transmitted from the upper layer to the lower layer can be easily blocked .

In addition, the method of constructing a car sounding laminate according to an embodiment of the present invention includes a wet process as well as a method of laminating a sound-absorbing laminate in a dry process. In such a case, the porous foamed olefin layer and foamed It is possible to effectively block noise in a desired frequency range by varying the stacking order of the polyurethane layers.

That is, the noise shielding method according to an embodiment of the present invention is advantageous in that the upper and lower layers are different from each other according to the purpose of sound insulation and the type of noise source to be shielded, thereby effectively blocking noise. Further, by using such a method, it is possible to cut off life noise and vibration in the building, or to apply noise to the vehicle to block engine noises and the like.

Hereinafter, the present invention will be described in detail with reference to examples. It is to be understood that the present invention is not limited by the following embodiments.

Production of porous foamed polyolefin layer

(LG Chem, Grade: R-3410, MFR: 7.0 ± 1.0 (g / 10 min), MP: 144 ± 1.5 (° C.), H: 75 ± 5) having a diameter of 5 mm Shaped pores having a diameter of 3 mm and a length of 5 mm to produce polypropylene expanded particles containing through-pores.

The prepared polypropylene expanded particles were put into a molding machine of steam chest molding method, and heated and pressed at 1.0 bar steam pressure to prepare a porous foamed polyolefin layer having an apparent density of 30 g / cm 3 and a thickness of 20 mm.

Manufacture of foamed polyurethane

A bead of spherical polyurethane having a diameter of 5 mm (Grade: 6185 AP, Hardness: 86 ± 3 (Shore A), density 1.12 (g / cm ³ ) MP: 164 ± 2) The foam was foamed to have an apparent density of 200 g / cm 3, placed in a molding machine of a chest molding method, and thermally compressed by 1.0 bar steam pressure to produce a foamed polyurethane layer.

[Example 1]

The foamed polyurethane prepared above was cut to a size of 20 x 20 cm and a thickness of 10 mm to prepare a foamed polyurethane layer and the porous foamed polyolefin layer prepared above was laminated on the foamed polyurethane layer to obtain a negative laminated body . At this time, the embossing layer formed by foaming of the beads in the foamed polyurethane layer was laminated with the bottom surface facing.

[Example 2]

The porous polyurethane foam layer was laminated on the embossed surface with the embossed surface facing upward in the foamed polyurethane layer in the same manner as in Example 1 to complete the negative laminated body.

[Example 3]

The foamed polyurethane prepared above was cut to a size of 20 x 20 cm and a thickness of 20 mm and then a porous foamed polypropylene layer was laminated on the foamed polyurethane layer in the same manner as described above, Mm, thereby completing the car-receiving laminate.

[Example 4]

The porous polypropylene layer was first laminated by the same method as in Example 3, and the foamed polyurethane layer was laminated on the porous expanded polypropylene to complete the negative laminated body.

[Comparative Example 1]

Experiments were carried out by cutting GL SYSTEM II, a 20 mm thick, 20X20 cm by Lao Chemical Company.

[Comparative Example 2]

The experiment was conducted by cutting the magic pole for standard bottom structure of Samyang Resin Co., Ltd. into a size of 20 × 20 ㎝ and a thickness of 30 ㎜.

[Measurement of difference in frequency according to frequency]

Experiments were conducted in accordance with KS F 2805 (Reverberation Experiment Sound Absorption Performance Measurement Method) in a simple reverberation room designed for uniform incidence and reflection of sound waves. Specifically, the specimen is installed in the reverberation room, and frequency sound source of the measurement area is stopped, the time of 30 dB reduction is measured after stopping the operation of the sound source, and the sound absorption rate is measured from 2 seconds before stopping the sound source to 5 seconds after stopping the sound source. The second order tone was calculated according to the standard.

In this way Tone differences of the sound-insulating laminates or sound insulating materials of Examples 1 to 2 and Comparative Examples 1 to 2 were measured and shown in Fig.

Referring to FIG. 2, it can be seen that the sound absorption ratio of the car sound layered product according to an embodiment of the present invention is remarkably high in a frequency range of about 1000 Hz or more, and accordingly, the car sound layered product according to one embodiment of the present invention It can be confirmed that the sound insulation efficiency is remarkably high.

[Measurement of difference in tone according to the order of lamination]

According to the above-mentioned KS F 2805 standard As shown in FIG. 3, the second harmonic of each of the sound-emitting laminates of Examples 3 and 4 was measured.

Although the present invention has been described with reference to the specific embodiments and the exemplary embodiments, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. Various modifications and variations are possible in light of the above teaching.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the claims set forth below, fall within the scope of the present invention.

Claims (11)

A porous expanded polyolefin layer and a thermoplastic expanded polyurethane layer (TPU) on which polyolefin expanded particles including through-pores are squeezed,
Wherein the difference in tone is 25% or more for noise in the range of 1200 to 10000 Hz in a thickness range of 30 to 40 mm. The method according to claim 1,
Wherein the polyolefin is polypropylene. The method according to claim 1,
Wherein the foamed polyurethane layer is foamed in the form of a closed cell. The method according to claim 1,
The porous foamed olefin layer: the foamed polyurethane layer has a thickness ratio of 1: 0.3 to 2. The method according to claim 1,
Wherein the polyolefin expanded particles containing the through pores are cylindrical or polygonal. The method according to claim 1,
Wherein the porous expanded polyolefin layer has an apparent density of 25 to 45 g / cm < 3 >. The method according to claim 1,
Wherein the foamed polyurethane layer has an apparent density of 50 to 350 g / cm < 3 >. The method according to claim 1,
Wherein said negative laminated body comprises a first porous foam polyolefin layer, a foamed polyurethane layer and a second porous foamed polyolefin layer in this order. Laminating the negative laminate of any one of claims 1 to 8 on the bottom surface; And
And placing the cement mortar on the laminated body. A noise shielding method using the negative laminate according to any one of claims 1 to 8,
Wherein the foamed polyurethane layer is disposed adjacent to the noise source. A noise shielding method using the negative laminate according to any one of claims 1 to 8,
Wherein the porous foamed polyolefin layer is disposed adjacent to the noise source.

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