Modified asphalt for asphalt-based vibration damping materials, compound for vibration damping materials, asphalt-based vibration damping sheets, floor structures

Abstract

To provide modified asphalt for asphalt-based vibration damping materials, a compound for vibration damping materials, an asphalt-based vibration damping sheet, and a floor structure that can ensure a sufficient amount of inorganic filler is filled into the asphalt, and can also increase the amount of inorganic filler and improve heat resistance through the modification of the asphalt. [Solution] Modified asphalt for asphalt-based vibration damping material, comprising straight asphalt mixed with one or more modifiers selected from petroleum resin, wax, thermoplastic resin, and thermoplastic elastomer; a compound 2 for vibration damping material, comprising modified asphalt for asphalt-based vibration damping material in which an inorganic filler is mixed and dispersed; an asphalt-based vibration damping sheet 1 containing the compound 2 for vibration damping material, which is formed into a sheet; and a floor structure using the asphalt-based vibration damping sheet.

Description

Technical Field

[0001] The present invention relates to modified asphalt for asphalt-based vibration damping materials, a vibration damping material composition, an asphalt-based vibration damping sheet, and a floor structure that are used for floors, walls and the like of buildings such as houses to prevent the transmission of vibration and noise.

Background Art

[0002] For example, in housing such as apartment buildings, sound insulation materials are used on the floors of the second and higher floors for the purpose of suppressing the generation of noise to the lower floors. Sound insulation materials are often used particularly when flooring is used as the floor finishing material, since the generation of noise to the lower floors is remarkable in such a case. Sheet-shaped asphalt-based vibration damping materials (hereinafter also referred to as asphalt-based vibration damping sheets) have been conventionally widely used as sound insulation materials. Sound insulation materials for floors are widely used because laying an asphalt-based vibration damping sheet under the floor finishing material is advantageous in terms of workability, cost, and performance.

[0003] Asphalt-based vibration damping sheets are generally formed by forming a material (asphalt-based vibration damping material), which is based on asphalt with a high-specific-gravity filler such as iron powder dispersed, mixed and filled therein, into a sheet shape, that is, the sheet-shaped vibration damping material itself, or a product obtained by bonding and integrating surface cloth such as non-woven fabric to both sides of the sheet-shaped vibration damping material (for example, Patent Document 1). In addition, most of the asphalt-based vibration damping sheets currently on the market use blown asphalt or asphalt for waterproofing work (asphalt for waterproofing work specified in JIS K 2207; the same applies hereinafter) as the base asphalt in terms of cost and performance.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0005] Incidentally, blown asphalt or waterproofing asphalt is primarily used for waterproofing applications. Compared to straight asphalt used for road paving, the demand for blown asphalt or waterproofing asphalt is lower and the supply routes are fewer. Compared to straight asphalt, blown asphalt or waterproofing asphalt is at a disadvantage in terms of supply stability, and in recent years, it has become difficult to obtain a stable supply.

[0006] In the field of waterproofing, waterproofing materials and sheets using modified asphalt, which is obtained by mixing and dispersing polymers such as thermoplastic elastomers like styrene-butadiene-styrene block copolymer (hereinafter also referred to as SBS in this specification) and styrene-isoprene-styrene block copolymer (hereinafter also referred to as SIS in this specification) into straight asphalt, have been on the market for some time. However, modified asphalt has not been used for asphalt-based vibration damping sheets, and there has been no dedicated modified asphalt technology.

[0007] When modified asphalt (straight asphalt mixed and dispersed with thermoplastic elastomers such as SBS and SIS), which is used in the waterproofing field, is used to manufacture sheet-type vibration damping materials for asphalt-based vibration damping sheets, the amount of filler that can be filled is small, resulting in insufficient filling. As a result, it is not possible to effectively increase the specific gravity (or density) required for asphalt-based vibration damping materials, and sufficient surface density, which is effective for sound insulation performance, cannot be secured, resulting in insufficient sound insulation performance. In addition, the small amount of filler that can be filled presents technical challenges such as not being able to obtain sufficient hardness and heat resistance (sufficiently small compressive strain and resistance to deformation at high temperatures such as 60°C).

[0008] The present invention provides modified asphalt for asphalt-based vibration damping materials, a compound for vibration damping materials, an asphalt-based vibration damping sheet, and a floor structure that can ensure a sufficient amount of inorganic filler is filled into the asphalt, and can also improve sound insulation performance and heat resistance by increasing the amount of inorganic filler filled through the modification of the asphalt. [Means for solving the problem]

[0009] To solve the above problems, the present invention provides the following embodiments. [1] Modified asphalt for asphalt-based vibration damping materials, comprising straight asphalt mixed with one or more modifiers selected from petroleum resins, waxes, thermoplastic resins, and thermoplastic elastomers. [2] Modified asphalt for asphalt-based vibration damping materials, comprising straight asphalt mixed with one or more modifiers selected from petroleum resins, waxes, and thermoplastic resins. [3] Modified asphalt for asphalt-based vibration damping materials, wherein one or more types of modifiers are mixed into straight asphalt, and one of the modifiers is an elastomer that does not have thermoplastic properties. A compound for vibration damping materials, comprising modified asphalt for asphalt-based vibration damping materials described in any one of items [4], [1] to [3], in which an inorganic filler is mixed and dispersed. [5] The damping compound according to [4], which is made high in specific gravity by filling it with a high specific gravity inorganic filler. [6] An asphalt-based vibration damping sheet having a surface material bonded to one or both sides of the front and back surfaces of a vibration damping compound described in [4] or [5] which has been formed into a sheet. A floor structure including the asphalt-based vibration damping sheet described in [7][6]. [Effects of the Invention]

[0010] According to the present invention, a sufficient amount of inorganic filler can be filled into the asphalt, and by modifying the asphalt, it is possible to improve sound insulation performance and heat resistance by increasing the amount of inorganic filler filled, and as a result, the range of applications can be expanded. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing an example of an asphalt-based vibration damping sheet according to one embodiment of the present invention. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below. One embodiment of the present invention is an asphalt-based vibration damping material (compound for vibration damping material) in which an inorganic filler is dispersed and mixed into modified asphalt in which a modifier, selected from one or more petroleum resins, waxes, thermoplastic resins, and thermoplastic elastomers, is mixed into asphalt. Depending on the type and amount of modifier added, a plasticizer may be dispersed and mixed in to suppress embrittlement and hardening at low temperatures. The plasticizer plays a role as a modifier. Dispersion and mixing of the plasticizer is not mandatory; both configurations with and without dispersed plasticizers are possible. Oil-based plasticizers are preferably used. Inorganic fillers can suitably include metal powders such as iron sand, slag, iron powder, and iron oxide powder, as well as calcium carbonate powder, cement powder, and rock powder. However, in terms of ensuring the sound insulation performance of asphalt-based vibration damping materials, it is preferable to use materials with a high specific gravity, and metal powders such as iron sand, slag, iron powder, and iron oxide powder are preferred.

[0013] The asphalt used in the asphalt-based vibration damping material of this embodiment is straight asphalt. The asphalt-based vibration damping material of this embodiment uses modified asphalt (hereinafter also referred to as modified straight asphalt) in which one or more modifiers selected from petroleum resin, wax, thermoplastic resin, and thermoplastic elastomer are dispersed and mixed into straight asphalt. Thermoplastic resin is suitable as the modifier. Olefin-based resins can be suitably used as the thermoplastic resin. Modified straight asphalt can preferably employ a composition in which oil-based plasticizers are dispersed and mixed as needed. The modifier can be one or more selected from petroleum resins, waxes, thermoplastic resins, and thermoplastic elastomers, or one or more selected from petroleum resins, waxes, thermoplastic resins, and thermoplastic elastomers and a plasticizer only. Alternatively, the modifier can be one or more selected from petroleum resins, waxes, and thermoplastic resins, or one or more selected from petroleum resins, waxes, and thermoplastic resins and a plasticizer only. Modified straight asphalt serves the role of "modified asphalt for asphalt-based vibration damping materials."

[0014] The asphalt-based vibration damping material of this embodiment can be obtained by kneading asphalt to which a modifier (including a plasticizer as needed) selected from petroleum resin, wax, thermoplastic resin, and thermoplastic elastomer is added, and an inorganic filler is mixed and dispersed in the asphalt. The mixing temperature should be set to a temperature that reduces the viscosity of the asphalt and allows for sufficient mixing. Furthermore, the modifier used should be either a solid or clay-like substance at room temperature that is meltable upon heating (hereinafter also referred to as a heat-meltable modifier), or a liquid substance at room temperature, or both. When one or more types of modifiers, including a heat-meltable modifier, are mixed into the asphalt, the mixing temperature should be set to a temperature at which the heat-meltable modifier can be melted. The modifier is mixed evenly throughout the asphalt by kneading, forming a substantially homogeneous modified straight asphalt. The inorganic filler is mixed and dispersed throughout the modified straight asphalt by kneading. The asphalt-based vibration damping material is a compound for vibration damping in which the inorganic filler is mixed and dispersed in the modified straight asphalt. The asphalt-based vibration damping material of this embodiment can be obtained, for example, by adding a modifier to heated and molten straight asphalt, heating and mixing to produce modified straight asphalt, and then adding an inorganic filler to the modified straight asphalt and mixing to produce a vibration damping material compound. Alternatively, the asphalt-based vibration damping material of this embodiment can also be obtained by adding a modifier and an inorganic filler to heated and molten straight asphalt, heating and mixing to produce a vibration damping material compound.

[0015] Conventional asphalt-based vibration damping materials formed using blown asphalt or waterproofing asphalt will hereinafter also be referred to as "conventional blown asphalt vibration damping materials." The present inventors have found that the modified straight asphalt of the asphalt-based damping material of the present embodiment allows a larger amount of inorganic filler to be mixed therein than blown asphalt. The asphalt-based damping material of the present embodiment allows an amount of inorganic filler equal to or greater than that of conventional blown asphalt damping materials to be mixed into asphalt (the mixing amount of the inorganic filler into asphalt per unit volume can be equal to or greater than that of conventional blown asphalt damping materials). As a result, the asphalt-based damping material of the present embodiment can secure a product specific gravity equal to or higher than that of conventional blown asphalt damping materials, and sound insulation performance equal to or higher than that of the foregoing. The asphalt-based damping material of the present embodiment can ensure higher sound insulation performance than conventional blown asphalt damping materials. It has been found that while the specific gravity (density) of general blown asphalt damping materials is 2.0 to 3.0, the asphalt-based damping material of the present embodiment can secure a specific gravity (density) of 3.0 to 4.0. Furthermore, since the asphalt-based damping material of the present embodiment allows an increased mixing amount of inorganic filler compared to conventional blown asphalt damping materials, even when an inorganic filler having a lower specific gravity (density) than conventional fillers is used, a specific gravity (density) of 2.0 to 3.0, which is equivalent to that of general blown asphalt damping materials, can be secured.

[0016] The asphalt-based damping material of the present embodiment differs from conventional blown asphalt damping materials in two points: that it uses straight asphalt, and that an inorganic filler is mixed into asphalt containing a modifier (specifically, modified straight asphalt). The configuration of the asphalt-based damping material of the present embodiment is greatly different from that of conventional blown asphalt damping materials. For the asphalt-based damping material of the present embodiment, mechanical properties such as hardness and bendability can be adjusted over a wide range compared to conventional blown asphalt damping materials, depending on the type, properties and mixing amount of the modifier, the filling amount of the inorganic filler, and other factors.

[0017] The reason why the asphalt-based vibration damping material of the present embodiment allows a larger amount of inorganic filler to be mixed into asphalt compared with conventional blown asphalt vibration damping materials requires more detailed study and verification. However, it is assumed that the cause is that straight asphalt has a lower density of asphaltene, which is a polymer present in maltene (composed of resin and oil), compared to blown asphalt or asphalt for waterproofing construction. Asphaltene two-dimensionally bonds in asphalt maltene to form micelles. Compared with straight asphalt, blown asphalt or asphalt for waterproofing construction contains more asphaltene, which is a polymer present in maltene, but has less resin and a higher density of asphaltene micelles. For this reason, it is assumed that in blown asphalt or asphalt for waterproofing construction, asphaltene micelles act as an obstacle to the entry of inorganic filler into asphalt and serve as an inhibiting factor for increasing the filling amount of inorganic filler. In contrast, straight asphalt has a lower density of asphaltene micelles present in maltene than blown asphalt or asphalt for waterproofing construction, so it is easier to mix inorganic filler into asphalt. As a result, it is assumed that the filling amount of inorganic filler can be increased compared with blown asphalt. Furthermore, in the modified straight asphalt of the asphalt-based vibration damping material of the present embodiment, the presence of the modifier, which is one or more selected from petroleum resins, waxes, thermoplastic resins, and thermoplastic elastomers (a plasticizer is also used if necessary), contributes to reducing the asphaltene density in maltene, and as a result, it is considered that this advantageously acts to increase the filling amount of the inorganic filler.

[0018] As a result of various trial productions of the asphalt-based vibration damping material according to the present embodiment, the present inventor has found that an asphalt-based vibration damping material that secures product specific gravity equal to or higher than that of conventional blown asphalt vibration damping materials and sound insulation performance equal to or higher than that of conventional blown asphalt vibration damping materials can be obtained, and that mechanical properties such as hardness and bendability can be adjusted over a wider range compared to conventional blown asphalt vibration damping materials depending on the type, properties and mixing amount of the modifier, the filling amount of the inorganic filler, and the like.

[0019] The asphalt-based vibration damping material according to this embodiment can be molded into an appropriate shape and used. Furthermore, this asphalt-based vibration damping material can be configured as, for example, an asphalt-based vibration damping sheet in which a sheet-like surface material is attached to one or both sides of a sheet-like vibration damping material formed from asphalt-based vibration damping material, or as a configuration in which the sheet-like vibration damping material is used as an asphalt-based vibration damping sheet without a surface material. Asphalt-based vibration damping sheets can be used as a base to be laid under the floor finishing material of residential buildings such as apartment buildings. Asphalt-based vibration damping sheets used as a base to be laid under the floor finishing material of residential buildings will hereafter be referred to as asphalt-based floor vibration damping sheets.

[0020] Furthermore, asphalt-based soundproofing sheets for walls (hereinafter also referred to as asphalt-based soundproofing sheets for walls) have a structure in which a sheet-like surface material such as nonwoven fabric is attached to one or both sides of a sheet of molded asphalt. Asphalt-based soundproofing sheets for walls are sheets with a total thickness of about 1 to 3 mm and are generally supplied in rolls of 2 to 10 m in length. Asphalt-based soundproofing sheets for walls require flexibility in order to be rolled. For this reason, there have been conventional practices of using modified asphalt for the sheet-like asphalt to which the surface material is attached in asphalt-based soundproofing sheets for walls. In contrast, conventional asphalt-based vibration damping sheets for floors are generally thicker than asphalt-based soundproofing sheets for walls, typically having a total thickness of 2 to 12 mm. They are typically supplied in sheet form, such as 455 x 910 mm or 500 x 1000 mm, with multiple sheets stacked flat. Conventional asphalt-based vibration damping sheets for floors have poor workability unless they are somewhat rigid, and blown asphalt or waterproofing asphalt, which easily provides rigidity, have been suitably used. Conventional asphalt-based vibration damping sheets for floors do not require much flexibility, and therefore modified asphalt has not been used.

[0021] The asphalt-based floor damping sheet according to this embodiment uses modified asphalt (modified straight asphalt), ensuring sufficient flexibility. The asphalt-based floor damping sheet according to this embodiment can be formed into a sheet (mat-like) with a total thickness of 2 to 12 mm and dimensions of 455 x 910 mm or 500 x 1000 mm, similar to conventional asphalt-based floor damping sheets. Furthermore, the mechanical properties such as hardness and bendability of the asphalt-based floor damping sheet according to this embodiment can be widely adjusted by the type, properties, and amount of modifier, as well as the amount of inorganic filler used. For example, it is possible to ensure excellent flexibility that makes it easy to bend even with a total thickness of 2 to 12 mm, or conversely, to create a plate-like state with sufficient hardness. Furthermore, the modified asphalt used in asphalt-based soundproofing sheets for walls is intended to provide flexibility (bendability) due to its roll-shaped product form. Therefore, if asphalt-based soundproofing sheets for walls are repurposed for floors, they will not achieve the sufficient hardness required for floor applications. Additionally, because flexibility is prioritized in asphalt-based soundproofing sheets for walls, their heat resistance (load-bearing capacity at high temperatures such as 60°C) is insufficient. The modified asphalt technology used in asphalt-based soundproofing sheets for walls differs from the modified asphalt technology required for vibration-damping sheets for floors.

[0022] The asphalt-based vibration damping material according to this embodiment can be used, for example, in the manufacture of the asphalt-based vibration damping sheet 1 illustrated in Figure 1. The asphalt-based vibration damping sheet 1 in Figure 1 consists of a sheet-like vibration damping material 2 formed from the asphalt-based vibration damping material according to this embodiment, and sheet-like surface materials 3 attached to both sides of the sheet-like vibration damping material 2. Furthermore, the asphalt-based vibration damping sheet can also be configured in which one of the surface materials 3 on both sides of the sheet-like vibration damping material 2 of the asphalt-based vibration damping sheet 1 in Figure 1 is omitted, that is, a configuration in which the surface material 3 is attached to only one side of the sheet-like vibration damping material 2. Asphalt-based vibration damping sheets can be used as a substrate beneath floor finishing materials in residential buildings such as apartment complexes. In residential buildings, a floor structure in which the asphalt-based vibration damping sheet of this embodiment is used as a floor vibration damping sheet (also called an asphalt-based floor vibration damping sheet or intermediate floor vibration damping sheet) installed between the floor substrate and the floor finishing material can be suitably adopted.

[0023] The surface material 3 can be, for example, a flexible sheet-like material such as nonwoven fabric, film, or paper. The surface material 3 can be attached to the sheet-like vibration damping material 2 by the adhesive properties of the sheet-like vibration damping material 2 itself. The surface material 3 is preferably a nonwoven fabric or paper, and more preferably a nonwoven fabric, in terms of ensuring stable adhesion to the sheet-like vibration damping material 2 due to the adhesiveness of the surface of the sheet-like vibration damping material 2 itself. Nonwoven fabric is advantageous in that it can be integrated with the surface layer of the sheet-like vibration damping material 2 by the penetration of its constituent fibers into the surface layer of the sheet-like vibration damping material 2, thereby ensuring stable adhesion to the sheet-like vibration damping material 2.

[0024] The asphalt-based vibration damping material according to this embodiment can ensure a product specific gravity and sound insulation performance equivalent to or better than that of conventional blown asphalt vibration damping materials. Furthermore, the asphalt-based vibration damping material according to this embodiment can achieve almost the same ease of application and usability as conventional blown asphalt vibration damping materials by adjusting the modifier of the modified straight asphalt.

[0025] Furthermore, the asphalt-based vibration damping material according to this embodiment can achieve heat resistance (resistance to deformation under compressive force at high temperatures such as 60°C) greater than that of conventional blown asphalt vibration damping materials by adjusting the modifier of the modified straight asphalt. The asphalt-based vibration damping material according to this embodiment can easily achieve heat resistance greater than that of conventional blown asphalt vibration damping materials by using modified straight asphalt which is harder than blown asphalt or waterproofing asphalt in the expected operating temperature range. As a result, the asphalt-based vibration damping material according to this embodiment can suppress deformation within an acceptable range, for example, during storage or while being used as a building material such as an intermediate vibration damping sheet for floors. For asphalt-based vibration damping sheets including sheet-shaped vibration damping materials formed from asphalt-based vibration damping material, dimensional changes in the surface direction and thickness direction of the sheet-shaped vibration damping material can be suppressed within an acceptable range.

[0026] For asphalt-based vibration damping sheets (asphalt-based floor vibration damping sheets) used as underlayment for floor heating, the improved heat resistance allows for a higher temperature at which dimensional changes in the planar and thickness directions of the sheet-type vibration damping material can be suppressed within an acceptable range. This makes it possible to increase the floor temperature during floor heating operation within the range at which dimensional changes in the planar and thickness directions of the sheet-type vibration damping material can be suppressed within an acceptable range. The asphalt-based vibration damping material according to this embodiment can ensure higher dimensional stability compared to conventional asphalt-based vibration damping sheets. The asphalt-based vibration damping material according to this embodiment employs modified straight asphalt, which is harder than blown asphalt or waterproofing asphalt in the expected operating temperature range. This provides the advantages of stably maintaining sound insulation performance against temperature changes and eliminating or reducing the impact on the design around the construction site.

[0027] When installing floor heating panels, the typical floor structure consists of the floor finishing material (such as flooring), the floor heating panel, the soundproofing material (hereinafter also called floor soundproofing material), which is an asphalt-based vibration damping sheet (intermediate floor vibration damping sheet), and the subfloor, arranged in this order from top to bottom. However, if the soundproofing material (asphalt-based vibration damping sheet) underneath the floor heating panel is in contact with the floor heating panel, the soundproofing material (intermediate floor vibration damping sheet) will be heated to about 40-50°C by the operation of the floor heating panel, and may be heated to an even higher temperature due to factors such as the temperature at which the floor heating panel is started. For this reason, in order to suppress or prevent deformation of the soundproofing material heated by the heat generated by the floor heating panel, measures are often taken to install plywood (subfloor plywood) between the floor heating panel and the soundproofing material underneath. When plywood (subfloor plywood) is installed between the floor heating panel and the soundproofing material underneath, it may affect the design of the area around the installation site, such as the height of the subfloor. The asphalt-based vibration damping sheet (asphalt-based floor vibration damping sheet) according to this embodiment can ensure higher heat resistance and dimensional stability than conventional asphalt-based vibration damping sheets using blown asphalt vibration damping material. Therefore, when the asphalt-based vibration damping sheet according to this embodiment is used as a soundproofing material for the floor in a floor structure with floor heating panels, it is possible to eliminate the need to provide plywood (subfloor plywood) between the floor heating panels and the soundproofing material underneath. As a result, it is possible to avoid inconveniences such as the impact on the design of the area around the installation site, such as the height of the floor subfloor, that can occur when plywood (subfloor plywood) is provided.

[0028] The adoption of modified straight asphalt, which is harder than blown asphalt or waterproofing asphalt in the expected operating temperature range, effectively contributes to ensuring the overall hardness of the asphalt-based vibration damping sheet (asphalt-based floor vibration damping sheet) and improving the dimensional stability of the asphalt-based vibration damping sheet in the planar and thickness directions. The asphalt-based floor damping sheet according to this embodiment is less prone to deformation (crushing) in the thickness direction compared to conventional asphalt-based floor damping sheets. As a result, it is possible to minimize the sinking of flooring (floor finishing material) installed on the asphalt-based floor damping sheet according to this embodiment due to walking by residents. Furthermore, since the asphalt-based floor damping sheet according to this embodiment is harder than conventional asphalt-based floor damping sheets, it is less prone to crushing when heavy loads from installed objects (such as bookshelves and pianos) are concentrated in a specific area, and less prone to crushing due to the long-term effect of the load from installed objects, which is advantageous for maintaining a stable installed state of the object.

[0029] Furthermore, the asphalt-based vibration damping material according to this embodiment has the advantage of being able to be supplied stably by using modified straight asphalt, which is obtained by modifying readily available straight asphalt, rather than blown asphalt, and can also ensure sound insulation performance equivalent to or better than conventional asphalt-based vibration damping materials that use blown asphalt.

[0030] Although the present invention has been described above based on the best mode, the present invention is not limited to the best mode described above, and various modifications are possible without departing from the spirit of the invention. In this specification, modified asphalt obtained by modifying straight asphalt with a modifier is also referred to as "modified straight asphalt." For example, the modified asphalt for the asphalt-based vibration damping material according to the embodiment of the present invention may be a modified straight asphalt (hereinafter also referred to as non-thermoplastic modified asphalt) in which one or more types of modifiers are mixed into straight asphalt, and one of the modifiers is an elastomer that does not have thermoplastic properties. The elastomer that does not have thermoplastic properties can preferably be a thermosetting elastomer such as synthetic rubber. The modifiers other than the elastomer that does not have thermoplastic properties can preferably be one or more selected from petroleum resins, waxes, thermoplastic resins, thermoplastic elastomers, and plasticizers. The thermosetting elastomer such as synthetic rubber is added to the straight asphalt in powder, granular, or latex form and mixed by heating and kneading. The powdered or granular thermosetting elastomer is one that can be made compatible with and mixed with the straight asphalt by heating and kneading with the straight asphalt. The present invention also includes a vibration damping material formulation in which an inorganic filler is mixed and dispersed in non-thermoplastic modified asphalt, an asphalt-based vibration damping sheet in which a surface material is bonded to one or both sides of the surface of a vibration damping material formulation formed into a sheet, and a floor structure including this asphalt-based vibration damping sheet. [Explanation of symbols]

[0031] 1...Asphalt-based vibration damping sheet, 2...Sheet-type vibration damping material (asphalt-based vibration damping material, compound for vibration damping material), 3...Surface material.

Claims

1. Modified asphalt for asphalt-based vibration damping materials, comprising straight asphalt mixed with one or more modifiers selected from petroleum resins, waxes, thermoplastic resins, and thermoplastic elastomers.

2. Modified asphalt for asphalt-based vibration damping materials, comprising straight asphalt mixed with one or more modifiers selected from petroleum resins, waxes, and thermoplastic resins.

3. Modified asphalt for asphalt-based vibration damping material, wherein one or more types of modifiers are mixed into straight asphalt, and one of the modifiers is an elastomer that does not have thermoplastic properties.

4. A compound for vibration damping materials comprising modified asphalt for asphalt-based vibration damping materials according to any one of claims 1 to 3, in which an inorganic filler is mixed and dispersed.

5. The vibration damping compound according to claim 4, wherein the specific gravity is increased by filling a high-density inorganic filler with a high-density material.

6. An asphalt-based vibration damping sheet having a surface material bonded to one or both of the front and back surfaces of a vibration damping material compound according to claim 4, which is formed into a sheet.

7. A floor structure comprising an asphalt-based vibration damping sheet as described in claim 6.

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