JP2001349377A - Damping sheet and damping material - Google Patents

Abstract

(57) [Problem] To provide excellent sound insulation performance and heat insulation performance, high adhesive strength between a resin sheet and a resin foam, no release material is generated as a waste material, and cost may be increased. The present invention provides a vibration damping sheet and a vibration damping material which are suitably used especially for folded-plate roofs. SOLUTION: One side of a resin sheet having a specific gravity of 1.3 or more made of a resin composition containing rubber or a thermoplastic elastomer, a thermoplastic resin and an inorganic powder, has a thickness of 2 to 10 mm,
A resin foam having an expansion ratio of 10 to 50 times laminated by heating or heat fusion, and a heat-sensitive adhesive layer is formed on one surface of the resin foam. The above-mentioned vibration damping sheet characterized by the above-mentioned. In addition, a large number of small holes penetrating the resin sheet and the resin foam, is formed, preferably, the hole interval of the small holes is 10 to 100 mm, the vibration damping sheet having a hole diameter of 0.1 to 2.0 mm, And a vibration damping material in which a metal sheet is laminated on a resin sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping sheet and a vibration damping material particularly suitable for a folded metal roof.

[0002]

2. Description of the Related Art Conventionally, corrugated folded sheet roofs made of steel have been used as roofing materials for buildings such as houses. However, a folded sheet roof alone can provide sufficient sound insulation performance and heat insulation performance. It was difficult and I couldn't block the rain noise. As a measure for imparting the sound insulation performance and the heat insulation performance to the folded plate roof, for example, a method of laminating a vibration damping sheet on the back surface of the folded plate roof has been studied.

[0003] The performance required of the vibration-damping sheet used for the above-mentioned folded-plate roof is, for example, excellent sound insulation performance and heat-insulating performance even when the thickness is reduced. Deformation follows the shaping of the steel sheet and does not cause peeling or breakage.

As such a vibration damping sheet, for example, Japanese Patent Application Laid-Open No. 2000-301640 discloses a resin sheet made of a resin composition containing a rubber or a thermoplastic elastomer and an inorganic powder, in which a resin foam is laminated on one surface. A vibration damping sheet is disclosed.

[0005] In the case of the vibration damping sheet, the lamination of the resin sheet and the resin foam is performed, for example, by applying a solvent type adhesive to the surface of the resin sheet and / or the resin foam to be bonded, and after an appropriate drying time. After that, a method of bonding the two, a pressure-sensitive adhesive such as an acrylic resin-based solvent-type pressure-sensitive adhesive is applied to a release surface of a release material such as a release paper or a release film in advance, and then dried, for example. The method is carried out by, for example, a method of forming a pressure-sensitive adhesive layer on one surface of the resin foam by transferring the resin foam to one surface of the resin foam by roll pressure bonding, and then bonding the resin release material to one surface of the resin sheet while peeling off the release material.

[0006]

However, according to the studies by the present inventors, in the case of the former method using a solvent-type adhesive, although the adhesive strength is high, a drying method for volatilizing the solvent after application is performed. Since it is necessary to provide time, there is a problem that workability at the time of bonding is not good.

In the case of the latter method using a pressure-sensitive adhesive, the pressure-sensitive adhesive generally has a lower adhesive strength than the adhesive, and it is necessary to use a release material. There is a problem that the release material is generated as a waste material later and the cost increases.

Further, when the vibration-damping sheet is laminated on a steel plate and formed into a folded-plate roof, air or the like easily enters the laminating interface, swelling due to poor degassing, or sticking to the steel plate. When a solvent is used in the process, there is a problem that the residual excess solvent permeates the sheet and adversely affects the vibration damping performance.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide excellent sound insulation performance and heat insulation performance, a high adhesive strength between a resin sheet and a resin foam, and no use of a release material. Does not occur as waste material and does not increase the cost.In addition, when laminated on steel plates and formed into a folded plate roof, excellent sound insulation performance is obtained without peeling or breaking, especially folded plates An object of the present invention is to provide a vibration damping sheet suitably used for a roof.

[0010]

A vibration damping sheet according to the invention of claim 1 (hereinafter referred to as "the present invention 1") has a resin composition containing rubber or thermoplastic elastomer, thermoplastic resin and inorganic powder. One side of a resin sheet having a specific gravity of 1.3 or more made of a product, having a thickness of 2 to 10 mm and an expansion ratio of 10 to 5
It is characterized in that 0 times resin foam is laminated by heating.

The invention according to claim 2 (hereinafter referred to as “the present invention 2”)
The vibration damping sheet according to (1) is formed on one surface of a resin sheet having a specific gravity of 1.3 or more made of a resin composition containing rubber or a thermoplastic elastomer, a thermoplastic resin, and an inorganic powder.
A resin foam having a thickness of 2 to 10 mm and an expansion ratio of 10 to 50 is laminated by heat fusion.

The invention according to claim 3 (hereinafter referred to as "the present invention 3")
The vibration damping sheet according to claim 1 or 2, wherein a heat-sensitive adhesive layer is formed at an interface between the resin sheet and the resin foam.

The invention according to claim 4 (hereinafter referred to as “the present invention 4”)
The vibration damping sheet according to any one of claims 1 to 3
The vibration damping sheet according to any one of the above items, wherein a large number of small holes are formed through the resin sheet and the resin foam.

The invention according to claim 5 (hereinafter referred to as “the present invention 5”)
The damping sheet according to any one of claims 1 to 4, wherein the gap between the small holes is 10 or less.
-100 mm, and the hole diameter is 0.1-2.0 mm.

The invention according to claim 6 (hereinafter referred to as “the present invention 6”)
The vibration damping material according to any one of claims 1 to 5, wherein the metal sheet is laminated on the resin foam non-laminated surface of the resin sheet. I do. Hereinafter, the present invention will be described in more detail.

The resin composition for forming the resin sheet constituting the vibration damping sheet of the present invention contains rubber or a thermoplastic elastomer. These rubbers or thermoplastic elastomers may be used alone or in combination.

As the rubber, for example, butyl rubber,
Examples include urethane rubber, acrylic rubber, silicone rubber, ethylene-propylene copolymer rubber, and ethylene-propylene-diene terpolymer rubber. These rubbers
It may be unvulcanized rubber or vulcanized rubber. These rubbers may be used alone,
Two or more types may be used in combination.

Examples of the thermoplastic elastomer include isoprene-based elastomers, olefin-based elastomers, and ester-based elastomers. Of these, isoprene-based elastomers are preferably used, and styrene-isoprene block copolymer is particularly preferred. Particularly preferably used. These thermoplastic elastomers may be used alone or in combination of two or more.

The styrene-isoprene block copolymer comprises a styrene polymer block as the first component and a second component.
It is composed of a polymer block of isoprene as a component, and isoprene and butadiene may be used in combination as the second component.

When the second component of the styrene-isoprene block copolymer is composed of isoprene alone or a combination of isoprene and butadiene, there is no particular limitation. Those having a content of 4 bonds and 1.2 bonds of 40% by weight or more are preferred. 3.4 bond and 1 in the polymer block of the second component
When the content of the two bonds is less than 40% by weight, the sound insulating performance and the heat insulating performance in the normal use temperature range of the vibration damping sheet may be insufficient.

The styrene-isoprene block copolymer is not particularly limited, but preferably has a weight average molecular weight of 30,000 to 300,000, more preferably 80,000 to 250,000. It is. When the weight average molecular weight of the styrene-isoprene block copolymer is less than 30,000, mechanical properties such as strength at break and elongation at break of the block copolymer itself may be insufficient. If the weight average molecular weight of the block copolymer exceeds 300,000, the miscibility with the inorganic powder described below may be reduced. Commercially available styrene-isoprene block copolymers having the above-mentioned properties include, for example, "HIBLER" (trade name, manufactured by Kuraray Co., Ltd.).

The resin composition for forming the resin sheet constituting the vibration damping sheet of the present invention 1 contains a thermoplastic resin. Examples of the thermoplastic resin include an ethylene-vinyl acetate copolymer resin, a polyolefin-based resin, a vinyl chloride-based resin, and a polyester-based resin. Among them, an ethylene-vinyl acetate copolymer resin is preferably used. These thermoplastic resins may be used alone or in combination of two or more.

The above ethylene-vinyl acetate copolymer resin is
Although not particularly limited, those having a vinyl acetate content of 2 to 48% by weight are preferred. If the vinyl acetate content of the ethylene-vinyl acetate copolymer resin is less than 2% by weight, the flexibility of the resin sheet or the vibration damping sheet may be insufficient, and conversely, the acetic acid content of the ethylene-vinyl acetate copolymer resin may be insufficient. When the vinyl content exceeds 48% by weight, the resin composition becomes tacky, and it may be necessary to perform a special release treatment during molding or storage of the resin sheet or the vibration damping sheet.

The resin composition for forming the resin sheet constituting the vibration damping sheet of the present invention 1 contains an inorganic powder. As the inorganic powder, for example, iron oxide, titanium oxide, metal oxides such as magnesium oxide, particulate metal,
Mineral crushed materials such as clay, talc, mica, quartz powder,
Examples thereof include calcium carbonate, gypsum, glass fiber, and glass powder. Among them, mica and calcium carbonate, which have excellent sound insulation performance and heat insulation performance and are advantageous in cost, are suitably used. These inorganic powders may be used alone,
Two or more types may be used in combination.

The inorganic powder is not particularly limited, but preferably has an average particle diameter of 1 to 500 μm. When the average particle diameter of the inorganic powder is less than 1 μm, the surface area of the inorganic powder is increased and the number of particles per unit weight is increased, so that the mixing step may take a long time, The average particle diameter of the inorganic powder is 500
If the thickness exceeds μm, the surface may become rough or the sheet may be broken during molding of a resin sheet or molding of a vibration damping sheet.

Preferred examples of the resin composition for forming the resin sheet constituting the vibration-damping sheet of the present invention are not particularly limited. For example, 100 parts by weight of a styrene-isoprene block copolymer is used. For
Examples of the resin composition include 20 to 5000 parts by weight of an ethylene-vinyl acetate copolymer resin and 200 to 10000 parts by weight of an inorganic powder.

The blending amount of the ethylene-vinyl acetate copolymer resin with respect to the styrene-isoprene block copolymer may be appropriately set according to the blending amount of the inorganic powder, the shape of the folded plate roof, and the like. Is preferably 20 to 5000 parts by weight, more preferably 100 to 1000 parts by weight, based on 100 parts by weight of the styrene-isoprene block copolymer. When the content of the styrene-isoprene block copolymer in the resin composition is 1% by weight or less, the amount of the ethylene-vinyl acetate copolymer resin is 100 parts by weight based on 100 parts by weight of the styrene-isoprene block copolymer.
It is preferably from 0 to 5000 parts by weight.

Styrene-isoprene block copolymer 1
If the amount of the ethylene-vinyl acetate copolymer resin is less than 20 parts by weight per 100 parts by weight, the moldability of the vibration damping sheet may be reduced, and conversely, the amount may be less than 100 parts by weight of the styrene-isoprene block copolymer. If the amount of the ethylene-vinyl acetate copolymer resin exceeds 5,000 parts by weight, the sound insulation performance and heat insulation performance of the vibration damping sheet may be reduced.

The amount of the inorganic powder relative to the styrene-isoprene block copolymer depends on the total amount of the styrene-isoprene block copolymer and the ethylene-vinyl acetate copolymer resin and the shape of the folded plate roof. In general, 200 to 10 parts by weight of the inorganic powder is used with respect to 100 parts by weight of the styrene-isoprene block copolymer.
000 parts by weight, more preferably 5 parts by weight.
It is 00 to 3000 parts by weight.

Styrene-isoprene block copolymer 1
If the amount of the inorganic powder is less than 200 parts by weight based on 00 parts by weight, it may be necessary to increase the thickness of the vibration damping sheet in order to exhibit desired sound insulation performance and heat insulation performance. -Isoprene block copolymer 10
If the compounding amount of the inorganic powder with respect to 0 parts by weight exceeds 10,000 parts by weight, mechanical properties such as strength at break and elongation of the vibration damping sheet may be reduced.

When the amount of the inorganic powder is more than 1000 parts by weight based on 100 parts by weight of the styrene-isoprene block copolymer, the styrene-isoprene block copolymer is added to secure the mechanical properties of the vibration damping sheet. 100
It is preferable that the blending amount of the ethylene-vinyl acetate copolymer resin is 200 to 5000 parts by weight with respect to parts by weight.

The resin composition for forming the resin sheet constituting the vibration-damping sheet of the present invention 1 includes, in addition to the above-mentioned rubber or thermoplastic elastomer, thermoplastic resin and inorganic powder which are essential components, the present invention. If necessary, as long as it does not hinder achievement of the above-mentioned tasks, for example, tackifying resin, antioxidant (antiaging agent), heat stabilizer, light stabilizer, ultraviolet absorber, lubricant, processing aid, coloring agent, One or more of various additives such as an antistatic agent and a flame retardant may be blended. In particular, in order to improve the adhesion of the vibration damping sheet to the steel sheet and the fluidity during molding, it is preferable to mix an appropriate amount of a tackifier resin such as a C9 petroleum resin.

The method for forming a resin sheet using the above-described resin composition is not particularly limited. For example, a method for forming a resin sheet at a temperature equal to or higher than the melting softening point (generally, 100
(Approximately 270 ° C.), and forming into a sheet (film formation) by an extrusion molding method, a calendar molding method, or the like, whereby a desired resin sheet can be obtained.

The above resin sheet used in the present invention 1 needs to have a specific gravity of 1.3 or more. When the specific gravity of the resin sheet is less than 1.3, the sound insulation performance of the vibration damping sheet becomes insufficient. There is no particular upper limit on the specific gravity of the resin sheet, but if it is too large, handling workability will be poor.

The thickness of the resin sheet may be appropriately set according to the composition of the resin composition, the required sound insulation performance and heat insulation performance, and is not particularly limited. , Preferably 10 mm or less,
It is more preferably 2 mm or less. When the thickness of the resin sheet exceeds 10 mm, when the laminated body (damping material) in which the vibration damping sheet and the steel sheet are laminated is formed into a folded plate roof shape having a corrugated cross section, for example, Breaking or peeling may occur.

The resin foam constituting the vibration damping sheet of the present invention is, for example, a synthetic resin foam such as a polyolefin resin foam such as a polyethylene resin foam or a polypropylene resin foam, or a soft vinyl chloride resin foam. Foam, styrene-butadiene copolymer rubber foam, synthetic rubber foam such as chloroprene rubber foam and rubber foam such as natural rubber foam, etc., among which polyethylene resin foam is preferably used. Can be These resin foams
They may be used alone or in combination of two or more.

The resin foam used in the present invention needs to have a thickness of 2 to 10 mm, preferably 4 to 10 mm. If the thickness of the resin foam is less than 2 mm, the sound insulation and heat insulating properties of the vibration damping sheet become insufficient, and if the thickness of the resin foam exceeds 10 mm, the vibration damping sheet and the steel sheet are laminated. When the body (damping material) is formed into, for example, a folded-plate roof shape having a corrugated cross section, deformation or breakage of the resin foam occurs.

The foamed resin used in the present invention must have an expansion ratio of 10 to 50 times, preferably 30 to 40 times. If the foaming ratio of the resin foam is less than 10 times, the sound insulation and heat insulating properties of the vibration damping sheet become insufficient, and if the foaming ratio of the resin foam exceeds 50 times, the vibration damping sheet and the steel sheet When the laminated body (damping material) is formed into, for example, a folded-plate roof shape having a corrugated cross section, deformation or breakage of the resin foam occurs.

Further, it is preferable that the resin foam used in the present invention has a closed cell structure and has as little water absorption and moisture absorption as possible. Further, the surface of the resin foam to be laminated with the resin sheet is preferably a skin surface rather than a sliced surface in order to obtain more excellent adhesiveness. Commercially available resin foams having such properties include, for example, polyethylene resin foams (trade name “Softlon” and trade name “Taika Softlon”) manufactured by Sekisui Chemical Co., Ltd.

The vibration damping sheet of the present invention is obtained by laminating the above resin foam on one side of the resin sheet by heating (the present invention 1) or laminating by heat fusion (the present invention 2). ). Therefore, at least one of the adhesive surface of the resin sheet and the adhesive surface of the resin foam has tackiness due to heating (the present invention 1) or has heat-fusing property (the present invention). Invention 2) is necessary.

When at least one of the resin sheet itself and the resin foam itself has adhesiveness due to heating or heat fusion property, the resin sheet and the resin foam are laminated by heating as they are. Or lamination by heat fusion.

When the resin sheet itself and the resin foam do not have adhesiveness due to heating or have heat fusibility, a heat-sensitive adhesive layer is formed at the interface between the resin sheet and the resin foam. Alternatively, the resin sheet and the resin foam may be laminated by heating via a heat-sensitive adhesive layer, or may be laminated by thermal fusion (the present invention 3).

As a lamination method in this case, for example, a heat-sensitive adhesive layer is formed on one surface of a resin sheet or one surface of a resin foam, and a heat-sensitive adhesive layer of a resin sheet or a resin foam is formed. For example, a method is used in which the other surface is used as an adhesive surface and is laminated with the adhesive surface of the other adherend by heating or heat fusion. The heat-sensitive adhesive layer may be formed on one side of the resin sheet, or may be formed on one side of the resin foam, but in order to obtain better adhesiveness, the heat-sensitive adhesive layer is formed on one side of the resin sheet. It is more preferable to form the resin foam on one side (preferably, the skin side) of the resin foam.

The heat-sensitive adhesive layer is not necessarily required to be a uniform layer, but exhibits a function of laminating the resin sheet and the resin foam by heating or laminating by heat fusion. If so, it may be uneven or partial. Further, the bonding surface between the heat-sensitive adhesive layer and the resin sheet or the resin foam may be any as long as both or one surface has adhesiveness by heating or heat-fusing property.

The adhesive used to form the heat-sensitive adhesive layer is such that its dried film has no substantial adhesion at room temperature, but is reactivated by heating. Any adhesive that can exhibit excellent adhesiveness to various adherends, that is, any adhesive that has adhesiveness by heating or heat-fusing property may be used. A natural rubber adhesive having a composition of polyisoprene rubber, polybutadiene rubber, chloroprene rubber, styrene-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, butyl rubber, acrylic rubber, ethylene-propylene copolymer rubber, etc. Rubber adhesive; vinyl acetate resin, ethylene-
Synthetic resin adhesive mainly composed of vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, acrylic resin, polyester resin, polyamide resin, etc .; styrene-butadiene-styrene block copolymer, styrene-isoprene block copolymer Examples include a polymer and a thermoplastic elastomer adhesive mainly containing a hydrogenated product thereof. These adhesives may be used alone or 2
More than one type may be used in combination.

In addition to the main components of the above-mentioned adhesives, if necessary, for example, a tackifying resin, a coupling agent, a filler, a softener, a plasticizer may be used as long as the achievement of the object of the present invention is not hindered. , Surfactants, antioxidants (anti-aging agents), heat stabilizers, light stabilizers, UV absorbers, colorants,
One or more of various additives such as an antifoaming agent and a flame retardant may be blended. Further, the form of the adhesive may be any form such as a solvent-type adhesive, an emulsion-type adhesive, a hot-melt-type adhesive, a film-like or sheet-like adhesive.

As a method of forming the heat-sensitive adhesive layer at the interface between the resin sheet and the resin foam, for example, a brush, a roll coater, a curtain flow coater, a spray coating method is applied to one side of the resin sheet or one side of the resin foam. After applying or laminating the adhesive on one side of the resin sheet or one side of the resin foam using a normal applicator or laminating machine such as a machine, hand gun, hot melt applicator, hot laminator, hot press, etc., if necessary And a method of forming a heat-sensitive adhesive layer through steps such as drying and cooling. By adopting such a method, a desired heat-sensitive adhesive layer can be formed.

The above-mentioned heat-sensitive adhesive layer is formed by heat-sensitive bonding to one side of the resin sheet or one side of the resin foam at the bonding site immediately before lamination by heating or lamination by heat fusion of the resin sheet and the resin foam. The agent may be applied by melting or dissolving in a solvent, or may be performed by transfer lamination, or may be heat-sensitively bonded to one side of a resin sheet or one side of a resin foam in a factory line in advance. It may be carried out by a method of forming an agent layer and carrying it into a bonding site in a wound state.

The coating amount of the heat-sensitive adhesive is not particularly limited, but is 3 to 200 g / m ² after drying.
It is preferred that If the coated amount of the heat-sensitive adhesive after drying is less than 3 g / m ² , sufficient adhesive strength may not be obtained even by heat fusion, and conversely, the coated amount of the heat-sensitive adhesive after drying. Is more than 200 g / m ² , the heat-sensitive adhesive layer is liable to cause cohesive failure, and on the contrary, the adhesive strength may be reduced.

In order to obtain more excellent adhesiveness on one side of the resin sheet on which the heat-sensitive adhesive layer is formed or on one side of the resin foam, as long as the object of the present invention is not hindered. Prior to the formation of the heat-sensitive adhesive layer, a surface oxidation treatment such as a corona treatment or an easy adhesion treatment such as a primer (undercoat) coating may be performed in advance.
Further, a similar easy-adhesion treatment may be applied to the bonding surface of the adherend of the other party in advance.

Since the heat-sensitive adhesive layer formed on one side of the resin sheet or one side of the resin foam does not have substantial tackiness or adhesiveness at room temperature, it can be used without using a release material. It can be wound as it is.

As a method of laminating the resin sheet and the resin foam by heating (the present invention 1) or laminating by heat fusion (the present invention 2), for example, a heater such as an infrared lamp or a gas burner is used. A method in which a resin sheet and an adhesive surface of an adherend of the other party are laminated by heating and pressure bonding,
By using such a method, a desired vibration damping sheet can be obtained. In the case where a heat-sensitive adhesive layer is formed at the interface between the resin sheet and the resin foam (the present invention 3)
In, heat the heat-sensitive adhesive layer formed on the resin sheet or resin foam and the bonding surface of the adherend of the other party,
A method in which the heat-sensitive adhesive layer is heated and reactivated, pressure-bonded to the bonding surface of the adherend of the other party, and lamination is used. By using such a method, a desired vibration damping sheet can be obtained. .

In this case, when a method of forming a heat-sensitive adhesive layer on one surface (preferably a skin surface) of the resin foam is employed, and a method of forming a heat-sensitive adhesive layer on one surface of the resin sheet is employed. As compared with the above, the adhesive force between the resin sheet and the resin foam constituting the vibration damping sheet is more excellent. However, when obtaining the vibration damping sheet of the present invention, it is not always necessary to heat both the resin sheet and the resin foam in advance. By heating only the resin sheet sufficiently, abutting the heated resin sheet and a resin foam at room temperature (usually a heat-sensitive adhesive layer is formed on one side) and pressing the resin sheet,
This is because there is a case where a vibration damping sheet having a sufficient interfacial strength and obtained by laminating a foam on a resin sheet is obtained.

The resin foam having the heat-sensitive adhesive layer formed on one side is wound up as it is without using a release material, carried into the bonding site, and heated by the above-described method. Since it is reactivated and laminated on the bonding surface of the resin sheet, the workability at the time of bonding is good, and it does not adversely affect the safety and the environment. Further, since the release material is not used, the release material is not generated as a waste material after the bonding operation.

The vibration damping sheet of the present invention has a small size that penetrates the resin sheet and the resin foam in order to improve the degassing property of air entrapped when the steel sheet is laminated and the drying property of the solvent-based adhesive. It is preferable that a large number of holes (hereinafter sometimes referred to as “through holes” as appropriate) are formed. The number of small holes is appropriately determined in consideration of the size of the vibration damping sheet, the required degassing property, the drying property of the solvent, and the like.

The interval between the small holes is 10 to 100 mm.
It is preferred that If the hole interval is less than 10 mm, the tensile strength of the vibration damping sheet becomes too low, which may cause the sheet to break during handling, and if it exceeds 100 mm, the effect of providing the through holes is reduced.

The through holes may be provided so that the hole intervals are all the same, or may be provided so that the hole intervals are different within the above-described range. The shape of the through hole is not particularly limited, and is appropriately determined depending on a facility or a manufacturing process for forming the hole.
2.0 mm is preferred. If the pore diameter is less than 0.1 mm, sufficient deaeration and drying properties of the solvent cannot be obtained, and if it exceeds 2.0 mm, the deaeration properties and drying properties of the solvent become saturated, and no further improvement effect can be obtained. . In the case of a shape other than a circle, it is preferable that the longest diameter of the small hole is 0.1 to 2.0 mm. In addition, the arrangement pattern of the through holes is not particularly limited, and may be any pattern such as a lattice pattern, a staggered pattern in which the lattice pattern is alternately shifted in the width direction.

The method of providing the through holes is not particularly limited as long as the small holes penetrate the resin sheet and the resin foam, and the small holes are previously provided in each of the resin sheet and the resin foam. Although a hole may be used, both holes need to be penetrated, so it is preferable to perforate a vibration damping sheet obtained by laminating a resin sheet and a resin foam, for example, the vibration damping sheet Is preferably used between a large number of needles moving in the vertical direction; a method of pressing against a rotating roll provided with a large number of needles.

In the vibration damping material of the present invention, as the metal plate, for example, a resin-coated steel plate such as a vinyl chloride resin, an acrylic resin, a polyester resin, an alkyd resin, an epoxy resin, or a zinc iron plate is used. The metal plate may be bent before being laminated on the resin sheet or after being laminated.

The method of laminating the metal plate on the resin sheet is not particularly limited, and for example, a method of pressing the vibration damping sheet on the metal plate coated with an adhesive is exemplified.
As the adhesive, for example, a rubber-based solvent-based adhesive,
A two-pack type epoxy adhesive, a urethane adhesive or the like can be used, and among them, a chloroprene-based rubber solvent-type adhesive is particularly preferable. The adhesive surface of the vibration damping sheet may be subjected to a primer treatment in advance.

(Function) The vibration-damping sheet of the present invention contains a resin having a specific thickness and a foaming ratio on one side of a resin sheet containing a rubber or a thermoplastic elastomer, a thermoplastic resin and an inorganic powder and having a specific gravity. Since the foam is laminated, excellent sound insulation performance and heat insulation performance are exhibited. Further, since the laminate of the resin sheet and the resin foam is laminated by heating or laminated by heat fusion via a heat-sensitive adhesive layer, the adhesive force between the resin sheet and the resin foam is further increased. It will be excellent.

In particular, by forming a heat-sensitive adhesive layer on one side (preferably, a skin surface) of the resin foam in advance, the adhesive strength between the resin sheet and the resin foam is further improved. Further, since the heat-sensitive adhesive layer has no substantial tackiness or adhesiveness at room temperature, it is not necessary to use a release material, and the release material does not occur as a waste material after the bonding operation. .

Further, in the present invention, a large number of small holes penetrating the resin sheet and the resin foam are formed, so that in the bonding step between the vibration damping sheet and the steel sheet, the entrapped air is released and sufficient deaeration is performed. In addition to the above, the solvent of the adhesive used for laminating the vibration damping sheet and the steel sheet does not remain and foam, and drying can be promoted. Further, the solvent of the adhesive does not remain to swell the resin sheet, and the performance of the vibration damping sheet does not decrease.

[0064]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. In the examples, “parts” means “parts by weight”.

(Example 1) Styrene-isoprene block copolymer (trade name "HIBLER", weight average molecular weight: about 140,000, manufactured by Kuraray Co., Ltd.) 1 as a thermoplastic elastomer
00 parts, 100 parts of an ethylene-vinyl acetate copolymer resin (vinyl acetate content: 30% by weight) as a thermoplastic resin, and calcium carbonate (average particle diameter: 2 μm) as an inorganic powder
m) 200 parts and mica (100 mesh pass product) 15
The resin composition consisting of 0 parts was supplied to an extruder, heated and kneaded, and extruded to prepare a resin sheet having a thickness of 1 mm and a specific gravity of 1.7.

Also, a polyethylene resin foam (trade name “Taika Softlon”, thickness: 4 mm, expansion ratio: 30 times,
An adhesive solution obtained by dissolving SBS in a solvent is applied to the skin surface of Sekisui Chemical Co., Ltd. so that the coating amount after drying is 45 g / m ^2, and after drying, a release material is used. Instead, it was wound up as it was to produce a resin foam having an SBS-based heat-sensitive adhesive layer (about 1 μm) formed on one surface.

Using an infrared lamp, one side (adhesion side) of the resin sheet obtained above was heated to a temperature of 100 to 140 ° C., and the SBS of the resin foam obtained above was heated.
Pressure bonding with the surface (adhesion surface) on which the heat-sensitive adhesive layer is formed,
The sheets were laminated to produce a vibration damping sheet. The adhesive strength between the resin sheet and the resin foam of the vibration damping sheet obtained as described above was measured by the method described below, and it was visually confirmed whether or not the release material was generated as a waste material after the bonding operation. The results were as shown in Table 1.

(Examples 2 to 4) Also, the vibration damping sheet produced in Example 1 was brought into contact with a rotating roll provided with a large number of needles at a predetermined interval on the circumferential surface of the body while rotating. As a result, through holes having a hole diameter and a hole interval shown in Table 2 were formed, and the vibration damping sheet was wound up. Next, PVC steel sheet (steel thickness: 0.6 mm, vinyl chloride resin coating thickness: 200 μm)
After applying a chloroprene-based adhesive to the non-painted surface of the above, the roll of the vibration damping sheet is unwound at a speed of 7 m / s, and the non-laminated resin foam side of the vibration damping sheet is adhered to the adhesive applied surface of the steel sheet. They were bonded together to obtain a damping material. The loss coefficient of the obtained damping material was measured by the following method. Table 2 shows the results.
Was as shown in FIG.

Comparative Example 1 An acrylic resin-based solvent-type pressure-sensitive adhesive was applied to the skin surface of the same polyethylene resin foam “Taika Softlon” as used in the example, and the coating amount after drying was 45.
g / m ^2, and after drying, release paper (release material) was laminated to produce a resin foam having an acrylic resin-based pressure-sensitive adhesive layer formed on the skin surface.

Next, using a laminating roll, a surface (adhesive surface) of the resin sheet obtained in the example on which one side (adhesive surface) was formed with the acrylic resin-based pressure-sensitive adhesive layer of the resin foam obtained above. While the release paper (release material) was peeled off, each of the resin sheet and the foam was pressed and laminated without heating to produce a vibration damping sheet. The adhesive strength between the resin sheet and the resin foam of the obtained vibration damping sheet was measured and confirmed by the following method as in Example 1. The results were as shown in Table 1.

(Comparative Examples 2 to 3) In the vibration damping sheet obtained in Comparative Example 1, if necessary, through holes having the hole diameters and the hole intervals shown in Table 2 were formed in the same manner as in Examples 2 to 4. The vibration damping sheet was wound up. Next, a PVC steel plate (steel plate thickness: 0.6 mm, vinyl chloride resin coating thickness: 200μ)
m) After applying the chloroprene adhesive to the unpainted surface,
Unwinding the roll of the vibration damping sheet at a speed of 7 m per second,
The resin foam non-laminated side of the vibration damping sheet was adhered to and bonded to the adhesive-coated surface of the steel sheet to obtain a vibration damping material. The loss coefficient of the vibration damping material obtained as described above was measured by the following method in the same manner as in Examples 2 to 4. The results were as shown in Table 2.

(Measurement Method) [Measurement Method of Adhesive Strength] The vibration damping sheet was cut into a size of 25 mm width × 150 mm length to obtain a test piece. After peeling the resin foam from the resin sheet by 30 mm from one width side of this test piece, a T-type peel test between the resin sheet and the resin foam was performed at a peeling rate of 300 mm / min. Observed visually. If the resin foam is destroyed, the adhesive strength is excellent, and if the resin foam is peeled off at the interface, the adhesive strength is inferior. The T-peel test was performed both after 30 minutes of bonding (initial bonding strength) and after 24 hours of bonding (final bonding strength).

[Measurement Method of Loss Coefficient] A test piece cut into a size of 15 mm in width and 250 mm in length was used as a sample of a vibration damping material which had passed for 3 days after laminating a PVC steel sheet and a vibration damping sheet. 500H according to JIS G0602
The loss factor at z was measured.

[Table 1]

[Table 2]

As is clear from Table 1, the vibration-damping sheets of the examples according to the present invention have excellent adhesive strength between the resin sheet and the resin foam at both the initial stage and the final stage, and use a release material. There was no release material generated as waste after the bonding operation. Moreover, as is clear from Table 2, when laminated on a steel plate and processed into a folded plate roof, it was found that the loss coefficient was large and the sound insulation performance was excellent.

[0075]

As described above, the vibration damping sheet of the present invention comprises a high specific gravity resin sheet comprising a resin composition containing rubber or a thermoplastic elastomer, a thermoplastic resin and inorganic powder, and a specific thickness. Since the resin foam having an expansion ratio is laminated by heating or by heat fusion, it has excellent sound insulation performance and heat insulation performance, and the initial and final adhesive strength between the resin sheet and the resin foam. In each case, the cost is high, and since there is no need to use a release material, the release material does not occur as a waste material after the bonding operation, and the cost does not increase. Also, when laminating the above vibration damping sheet on a steel plate and forming it into a folded-plate roof, many small holes are formed through the resin sheet and the resin foam, so that air or the like enters the lamination interface. It is possible to prevent the residual solvent from adversely affecting the vibration damping performance of the sheet, even if it is difficult to cause swelling due to poor degassing or use a solvent-based adhesive for lamination, especially for folded plate roofs Is suitably used as a vibration damping sheet. Further, the vibration damping material of the present invention has good sound insulation performance because a metal plate is laminated on the vibration damping sheet.

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Claims (6)

[Claims] 1. A resin sheet comprising a resin composition containing rubber or a thermoplastic elastomer, a thermoplastic resin and an inorganic powder, having a specific gravity of 1.3 or more, has a thickness of 2 to 10 m on one surface.
m, a resin foam having a foaming ratio of 10 to 50 times laminated by heating. 2. A resin sheet comprising a resin composition containing rubber or a thermoplastic elastomer, a thermoplastic resin, and an inorganic powder and having a specific gravity of 1.3 or more, has a thickness of 2 to 10 m on one surface.
m, a resin foam having a foaming ratio of 10 to 50 times laminated by heat fusion. 3. A heat-sensitive adhesive layer is formed at an interface between a resin sheet and a resin foam.
Or the vibration damping sheet according to 2. 4. A small number of small holes penetrating a resin sheet and a resin foam.
The vibration damping sheet according to any one of the above items. 5. The vibration damping sheet according to claim 1, wherein the small holes have a hole interval of 10 to 100 mm and a hole diameter of 0.1 to 2.0 mm. . 6. The vibration damping material according to claim 1, wherein a metal plate is laminated on the non-laminated surface of the resin foam of the resin sheet.