KR20170069542A - Sound-insulation for automobile using spray polyurethane - Google Patents
Sound-insulation for automobile using spray polyurethane Download PDFInfo
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- KR20170069542A KR20170069542A KR1020150176879A KR20150176879A KR20170069542A KR 20170069542 A KR20170069542 A KR 20170069542A KR 1020150176879 A KR1020150176879 A KR 1020150176879A KR 20150176879 A KR20150176879 A KR 20150176879A KR 20170069542 A KR20170069542 A KR 20170069542A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- C08K3/0033—
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2350/00—Acoustic or vibration damping material
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The present invention relates to a sound insulating material for automobiles using spray polyurethane. More specifically, the present invention relates to a sound insulating material for automobiles using a spray polyurethane, It is possible to improve the sound-insulating performance, to improve the processability, to vary the thickness, to improve the workability and flexibility, and to have excellent effects in mechanical properties such as tensile strength, elongation, tear strength and hardness, The present invention relates to a sound insulating material for automobiles using a spray polyurethane applicable to a bottom surface of a railway vehicle, a building, etc., a composite material such as a steel sheet, a nonwoven fabric, a concrete panel,
Description
The present invention relates to a sound insulating material for automobiles using spray polyurethane. More specifically, the present invention relates to a sound insulating material for automobiles using a spray polyurethane, It is possible to improve the sound-insulating performance, to improve the processability, to vary the thickness, to improve the workability and flexibility, and to have excellent effects in mechanical properties such as tensile strength, elongation, tear strength and hardness, The present invention relates to a sound insulating material for automobiles using a spray polyurethane applicable to a bottom surface of a railway vehicle, a building, etc., a composite material such as a steel sheet, a nonwoven fabric, a concrete panel,
The vehicle continuously generates noise from the engine while driving, and the generated noise penetrates into the interior of the vehicle through the dash panel or leaks out through the gap of the vehicle body. Thus, a person who rides in the inside of the vehicle is damaged from the noise penetrating into the interior of the vehicle, and the person outside the vehicle is also subjected to the noise exposed from the engine. Therefore, in order to reduce automobile noise, various materials are applied to the soundproofing material over the entire surface of the vehicle.
In general, soundproofing materials have mostly multi-structure, in order to obtain more advantageous absorption effect on the same material weight by using a multi-layer type combining materials having different compositions and densities. It is well known that a soundproofing material having such a multi-structure is largely laminated by combining a sound absorbing material and a sound insulating material.
In the case of using a material having a soundproofing and sound insulation effect as described above, improvement in fuel consumption can also be expected when the material is made lighter. In recent years, various kinds of materials have been applied to lighten the sound insulating material and the sound absorbing material.
Particularly, in case of sound insulating materials, ethylene vinyl acetate (EVA), which has excellent processability and flexibility, is used in a sheet form having a specific gravity ranging from 1.9 to 2.1 in order to improve sound insulation performance. Such a sound insulating material is widely used as a composite material to be attached to a bottom surface or a wall surface of an automobile, a railway vehicle, a building, etc., or to be attached to a steel sheet, a nonwoven fabric, a concrete panel or a wood board.
In the case of automobiles, the sound insulating material is mainly made of a heavy layer material, which is heavy rubber. The sound insulating material, together with the sound absorbing material, adheres to the inner surface of the bonnet of the automobile, the dash panel, or the panel inside the automobile, so that the noise transmitted from the noise source partially reflects and externally transmits the sound. The sound insulating material installed in the bonnet attenuates the noise generated from the engine and reflects the noise to the outside, and the sound insulating material installed on the panel inside the vehicle reflects or attenuates the noise of the engine or the outside to the outside, To be protected.
However, the conventional sound insulating material composition used for a dash insulator or a dash isolation pad portion based on a dash panel of an automobile is polyvinyl chloride (PVC), natural rubber (NR), ethylene vinyl acetate (EVA) However, since the focus is on increasing the thickness and weight, there is a limitation in improving the sound insulation performance by grasping the dispersion degree of the binder and the filler.
Korean Patent No. 10-0889848 discloses an EPDM, an ethylene vinyl acetate (EVA), a calcium carbonate (CaCo 3 ), stearic acid, LLDPE (linear low density polyethylene), an elastomer, (Process Oil). However, in the conventional literature, a sound insulating material with a high specific gravity (1.9 to 2.1) is used for the sound insulating effect. That is, since the mass law is applied to the sound insulation performance, the sound insulating performance is improved when the sound insulating material having a high specific gravity is applied, but the weight of the sound absorbing material is proportionally increased, thereby increasing the gross weight of the vehicle.
Therefore, it is required to develop a new material excellent in sound insulating performance by improving the dispersibility of the binder and the filler while reducing the weight of the conventional sound insulating material.
In order to solve the above-mentioned problems, the present invention is to improve the weight saving and sound insulation performance compared to existing sound insulating materials by forming a spraying polyurethane by mixing a filler with a binder resin of a polyether polyol and a modified methylene diphenyl diisocyanate to form a sound insulating material , It is found that the process is easy by forming the polyurethane sound insulating material by spraying method, the thickness of the sound insulating material is improved, the workability and flexibility are improved, and the mechanical properties such as tensile strength, elongation, tear strength and hardness are excellent Thereby completing the invention.
Accordingly, an object of the present invention is to provide a sound insulating material for automobiles using spray polyurethane which reduces the weight of a vehicle body and improves sound insulation performance.
Another object of the present invention is to provide a dash isolation pad for an automobile manufactured using the sound insulating material.
The present invention relates to a resin composition comprising 30 to 40% by weight of a polyether polyol resin having a hydroxyl value (OH) in the range of 110 to 130 mgKOH / g; 10 to 20% by weight of modified methylene diphenyl diisocyanate having an isocyanate (NCO) group content of 20 to 30%; And 40 to 60% by weight of a filler. The present invention provides a sound insulating material for automobiles using spray polyurethane.
The present invention also provides a dash isolation pad for an automobile manufactured using the sound insulating material.
The sound insulating material for automobiles according to the present invention reduces the weight of the vehicle body compared with the conventional sound insulating materials by mixing the filler with the binder resin of the polyether polyol and the modified methylene diphenyl diisocyanate to form the spray polyurethane to thereby improve the fuel economy It is possible to greatly improve the sound insulation performance.
In addition, by forming a polyurethane sound insulating material by a spray method, the process is easy, the thickness of the sound insulating material is improved, the workability and flexibility are improved, and the mechanical properties such as tensile strength, elongation, tear strength and hardness are also superior to those of the conventional sound insulating material.
Also, it can be applied to a floor of automobile interior materials, a railroad car, a building, a composite material such as a steel plate, a nonwoven fabric, a concrete panel, and a wood board.
FIG. 1 is a graph comparing sound insulation performances of the sound insulating materials prepared in Examples and Comparative Examples 1 and 2 according to the present invention. FIG.
2 is a cross-sectional view of a dash isolation pad for a vehicle to which a sound insulating material according to the present invention is applied.
Hereinafter, the present invention will be described in more detail with reference to one embodiment.
The sound insulating material for automobiles using spray polyurethane of the present invention comprises 30 to 40% by weight of a polyether polyol resin having a hydroxyl value (OH) in a range of 110 to 130 mgKOH / g; 10 to 20% by weight of modified methylene diphenyl diisocyanate having an isocyanate (NCO) group content of 20 to 30%; And 40 to 60 wt% filler.
Specifically, the sound insulating material for automobiles is environmentally friendly and uses a polyurethane composition having a small migration, so that the weight of the sound insulating material is drastically reduced as compared with the conventional sheet type, the sound insulating material is formed by a spraying method, So that the weight of the vehicle body is reduced, thereby improving the fuel consumption and improving the sound insulation performance.
According to a preferred embodiment of the present invention, the polyether polyol resin has a hydroxyl value (OH) in a range of 110 to 130 mgKOH / g, a number of functional groups (f) of 3 to 5, In the range of 1300 to 1500 MPa · s. Specifically, when the hydroxyl value of the polyether polyol resin is less than 110 mgKOH / g, the amount of polyol input increases and the properties of the sound insulation sheet (tensile strength, elongation, hardness, etc.) There is a problem that the physical properties (tensile strength, elongation, hardness, etc.) become too high as compared with the requirement. If the number of functional groups is less than 3, the crosslinking reaction site (cross-linking site) is decreased and the properties of the sound insulation sheet (tensile strength, elongation, hardness, etc.) (Tensile strength, elongation, hardness, etc.) becomes too high as compared with the requirement due to too much CROSS-LINKING SITE. Further, when the viscosity is less than 1300 MPa · s, there is a problem that the polyol input amount is lowered so that the physical properties (tensile strength, elongation, hardness, etc.) are too high compared to the requirements. If the viscosity is more than 1500 MPa · s, Tensile strength, elongation, hardness, etc.) are too low compared to the requirements.
The polyether polyol resin may contain 30 to 40% by weight of the entire sound insulating material composition. When the content of the polyether polyol resin is less than 30% by weight, excess isocyanate groups (NCO) are excessively added to remain unreacted residues, . On the other hand, if it is more than 40% by weight, the mechanical properties are deteriorated. Preferably 30 to 35% by weight, and more preferably 31 to 33% by weight.
According to a preferred embodiment of the present invention, the modified methylenediphenyl diisocyanate is a prepolymer prepared by reacting polypropylene glycol at a high temperature. The modified methylenediphenyl diisocyanate has an excellent mechanical strength and is suitable for spraying due to its fast reactivity have. (NCO) group is 20 to 30%, the number of functional groups (f) is 2.0 to 2.2, and the viscosity is 450 to 700 Mpa · s at 25 ° C.
Specifically, when the isocyanate group of the modified methylene diphenyl diisocyanate is less than 20%, the modified methylene diphenyl diisocyanate is excessively charged, so that the mechanical properties (strength, elongation, hardness, etc.) If the amount is more than 30%, a small amount of the filler may be added, which may degrade the mechanical properties (strength, elongation, hardness, etc.) of the sound insulating sheet. If the number of functional groups is less than 2.0, there is a problem that the cross-linking site is reduced and the properties of the sound insulation sheet (tensile strength, elongation, hardness, etc.) become too low compared to the requirements. (Tensile strength, elongation, hardness, etc.) of the sound insulation sheet becomes too high compared to the requirements due to the increase of the cross-linking site. When the viscosity is less than 450 MPa · s, the amount of the modified methylene diphenyl diisocyanate is lowered so that the properties (tensile strength, elongation, hardness, etc.) are too low compared to the requirements. When the viscosity is more than 700 MPa · s, There is a problem that the physical properties (tensile strength, elongation, hardness, etc.) become too high as compared with the requirements because the amount of diphenyl diisocyanate is increased.
The modified methylene diphenyl diisocyanate may contain 10 to 20% by weight of the entire sound insulating material composition. When the content is less than 10% by weight, the mechanical strength is lowered. When the amount exceeds 20% by weight, The properties (strength, elongation, hardness, etc.) are higher than requirements, which may lower the sound insulation performance. By weight, preferably 10 to 14% by weight.
According to a preferred embodiment of the present invention, if the filler is not properly combined with the binder resin, bulk charging can not be performed, flexibility is reduced, play-out phenomenon occurs during molding, have. In the present invention, the polyether polyol resin and the modified methylene diphenyl diisocyanate are homogeneously and stably dispersed using a high-performance premixing apparatus in order to uniformly disperse the resin with the binder resin. The filler may be at least one selected from the group consisting of barium sulfate (BaSO 4 ), calcium carbonate (CaCO 3 ), mica (Mica) and titanium dioxide (TiO 2 ).
According to a preferred embodiment of the present invention, the filler having an average particle diameter of 30 to 50 μm can be used. Specifically, when the average particle diameter of the filler is less than 30 탆, the resin may not be uniformly distributed with the binder resin, resulting in a decrease in flexibility and moldability. If the average particle diameter is more than 50 탆, mechanical properties may be deteriorated. Preferably 35 to 45 mu m, and more preferably 40 mu m.
If the content of the filler is less than 40% by weight, the specific gravity of the filler may be lowered and the sound insulating performance may be deteriorated due to the weight effect (MASS LAW). On the other hand, If it is more than 10% by weight, the specific gravity is increased and the weight of the sound insulating sheet product becomes too high. And preferably 55 to 58% by weight.
According to a preferred embodiment of the present invention, the sound insulating material may be a spray polyurethane resin composition having an index (NCO / OH equivalence ratio) of 92 to 118% and a specific gravity of 1.4 to 1.6. Specifically, when the index of the polyurethane resin composition is less than 92%, excessive amount of polyol (OH) is added, unreacted polyol remains in a liquid phase and is not cured, the hardness of the sound insulating sheet becomes too low, There is a problem that can not be mounted on the panel assembly. On the other hand, if the amount of the isocyanate compound is more than 118%, the excess amount of isocyanate (NCO) is added to cause the unreacted isocyanate (NCO) to remain in the liquid phase and not harden and the hardness of the sound insulating sheet becomes too high, There is a problem that can not be done. In this case, the specific gravity is preferably 1.4 to 1.6, and the filler content of the entire sound insulating material composition can be controlled within a range of 40 to 60 wt%.
Meanwhile, the present invention includes an automobile dash isolation pad manufactured using the sound insulating material.
According to a preferred embodiment of the present invention, the automobile dash isolation pad comprises: a first sound absorbing material; A sound insulating material formed on the first sound absorbing material; And a second sound absorbing material formed on the sound insulating material.
According to a preferred embodiment of the present invention, the first and second sound absorbers may be made of a polyurethane foam, a hard polyethylene terephthalate (PET) felt, or a mixture thereof. Since the sound insulating material is formed by spraying with a sound insulating material using spray polyurethane, it is possible to selectively apply only a fragile portion and it is easy to control the thickness.
According to a preferred embodiment of the present invention, a sound insulating material of the sheet type may further be additionally provided between the sound insulating material and the second sound absorbing material. Specifically, the second sound insulating material may be a heavy layer sheet made of a thermoplastic elastomer (TPE), ethylene vinyl acetate (EVA), or a mixture thereof.
That is, the automobile dash isolation pad of the present invention may constitute a three-layer sound absorbing material composed of a sound absorbing material / thin film sound insulating material (sound absorbing material) / sound absorbing material, and is made of a sound absorbing material / thin film sound insulating material / sheet sound insulating material A sound absorbing material having a four-layer structure may be constructed. 2 is a cross-sectional view of a dash isolation pad for a vehicle to which a sound insulating material according to the present invention is applied.
The sound insulating material for automobiles according to the present invention is characterized in that a filler is mixed with a binder resin of a polyether polyol and a modified methylene diphenyl diisocyanate to prepare a spray polyurethane to form a sound insulating material so that the specific gravity And it is possible to improve the fuel efficiency by reducing the weight of the vehicle body while improving the quietness due to the improvement of sound insulation performance (improvement of NVH performance).
In addition, it is easy to process by forming solventless type polyurethane sound insulating material by spraying method. It is easy to process, improves the thickness of the sound insulating material, improves workability and flexibility, and has excellent mechanical properties such as tensile strength, elongation, tear strength and hardness .
Also, it can be applied to a floor of automobile interior materials, a railroad car, a building, a composite material such as a steel plate, a nonwoven fabric, a concrete panel, and a wood board.
Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.
Examples and Comparative Examples 1 and 2
The spray polyurethane resin composition was prepared by a conventional method for producing a resin composition for spraying, and was mixed at the content ratio shown in Table 2 below. Next, a semifinished product obtained by laminating and molding a TPE (thermoplastic elastomer) sheet (sound insulating material) was placed in a mold and heated to a predetermined temperature (55 to 70 ° C). Then, the polyurethane resin compositions prepared in the above Examples and Comparative Examples 1 and 2 were applied on one surface of the sheet to a thickness of about 0.5 to 3.0 mm using a high-pressure spraying apparatus shown in the following Table 1, (SPRAY-PU heavy layer) in the form of thin film (about 0.5mm or less) in contrast to the sound insulating material. The thus formed thin sound insulating material had a gel time of 6 to 9 seconds and was fully cured within a short time.
[Components]
(1) Polyether polyol having a viscosity of 1400 MPa.s at 25 占 폚, a specific gravity (25 占 폚) of 1.024 to 1.075, a hydroxyl value of 119 mgKOH / g and a functional group number of 3 to 5
(2) Modified methylenediphenyl diisocyanate having a viscosity of 600 MPa.s at 25 占 폚, a specific gravity (25 占 폚) of 1.130 to 1.150, an isocyanate group content of 23.3% and a functional group number of 2.0 to 2.2
(3) Filler: Barium sulfate (BaSO 4 ) having an average particle diameter of 40 탆,
(MAKER: Cosmec srl)
Experimental Example 1
The formability properties of the sound insulating materials prepared in the above Examples and Comparative Examples 1 and 2 were evaluated. The results are shown in Table 2 below.
According to the results shown in Table 2, unreacted residual polyol components were not cured due to the unreacted residual polyol component in Comparative Example 1 containing an excessive amount of the polyester polyol component, indicating that moldability was poor and the thickness deviation was large. In addition, in Comparative Example 2 in which the amount of the modified methylene diphenyl diisocyanate component was excessive, the unreacted residual isocyanate liquid component was flowed down, and it was confirmed that the moldability was greatly decreased as in Comparative Example 1.
On the other hand, in the case of the example in which the polyester polyol, the modified methylene diphenyl diisocyanate and the filler were mixed in an appropriate amount, the molding was cured for a short time of 1
Experimental Example 2
The lower layer is made of polyurethane foam with a first sound absorbing material (1 to 5 mm), the upper layer is made of PET with a second sound absorbing material (1 to 5 mm) A sound absorbing material having a multilayer structure composed of a TPE (Thermoplastic Elastomer) sheet and a thin film sound insulating material (0.5 to 3 mm) was manufactured from a sheet-type sound insulating material (1.2 to 3 mm). Here, the sound insulating materials prepared in Example 1 and Comparative Examples 1 and 2 were applied to the intermediate layer.
The durability, tensile strength, elongation, tear strength and sound insulation performance of the automobile dash isolation pad thus manufactured were evaluated, and the results are shown in Table 3 below.
(TPE)
(500 to 3.15 kHz
section)
According to the results of Table 3, not only the physical properties such as hardness, tensile strength, elongation, tear strength, and the like of the conventional sound insulating materials, Comparative Examples 1 and 2, .
On the other hand, in the case of the above examples, all of the standard values of the development targets requiring physical properties such as hardness, tensile strength, elongation and tear strength were satisfied, and in particular, the sound insulation performance was improved in the range of 500 to 3.15 kHz.
FIG. 1 is a graph comparing sound insulation performances of the sound insulating materials manufactured in the above-described embodiment and Comparative Examples 1 and 2. FIG. As can be seen from FIG. 1, it can be seen that the sound insulation performance of the embodiment is improved particularly in the interval of 500 to 3.15 kHz.
Therefore, the sound insulating material prepared by using the spray polyurethane resin composition of the present invention can be obtained by mixing a filler with a binder resin of a polyether polyol and a modified methylene diphenyl diisocyanate to prepare a spray polyurethane to form a sound insulating material, The weight can be reduced and the sound insulation performance can be greatly improved.
In addition, by forming a polyurethane sound insulating material by a spray method, the process is easy, the thickness of the sound insulating material is improved, the workability and flexibility are improved, and the mechanical properties such as tensile strength, elongation, tear strength and hardness are superior to those of the conventional sound insulating material Respectively.
Claims (7)
10 to 20% by weight of modified methylene diphenyl diisocyanate having an isocyanate (NCO) group content of 20 to 30%; And
40 to 60% by weight filler;
Wherein the spray polyurethane is used as a sound insulating material for automobiles.
Wherein the polyether polyol resin has a functional group number of 3 to 5 and a viscosity of 1300 to 1500 MPa · at 25 캜.
Wherein the modified methylene diphenyl diisocyanate has a functional group number of 2.0 to 2.2 and a viscosity of 450 to 700 MPa · s at 25 ° C.
Wherein the filler is barium sulfate (BaSO 4), calcium carbonate (CaCO 3), mica (Mica) and titanium dioxide (TiO 2) Automotive Materials for Enclosures for using spray polyurethane, characterized in that at least one member selected from the group consisting of.
Wherein the filler has an average particle diameter of 30 to 50 占 퐉 by spraying polyurethane.
Wherein the sound insulating material comprises a spray polyurethane resin composition having an index (NCO / OH equivalence ratio) of 92 to 118% and a specific gravity of 1.4 to 1.6.
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| WO2021126177A1 (en) * | 2019-12-18 | 2021-06-24 | Howa Co., Ltd. | Soundproof body provided with sound insulating layer formed of urethane resin, and manufacturing method of sound insulating layer by application of raw material for urethane resin |
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| KR102304884B1 (en) | 2020-02-05 | 2021-09-27 | 한화컴파운드 주식회사 | Sound insulation material composition and method for manufacturing sound insulation material for automobile a flow carpet produced therefrom |
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| EP2247667B1 (en) | 2008-02-27 | 2016-02-10 | Covestro Deutschland AG | Viscoelastic polyurethane foam containing castor oil |
| KR101270024B1 (en) | 2013-02-19 | 2013-05-31 | 정동근 | Dust proofing painting composition for noise and vibration prevention |
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| WO2021126177A1 (en) * | 2019-12-18 | 2021-06-24 | Howa Co., Ltd. | Soundproof body provided with sound insulating layer formed of urethane resin, and manufacturing method of sound insulating layer by application of raw material for urethane resin |
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