JP2009228692A - Vibration damping material - Google Patents

Vibration damping material Download PDF

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JP2009228692A
JP2009228692A JP2008071285A JP2008071285A JP2009228692A JP 2009228692 A JP2009228692 A JP 2009228692A JP 2008071285 A JP2008071285 A JP 2008071285A JP 2008071285 A JP2008071285 A JP 2008071285A JP 2009228692 A JP2009228692 A JP 2009228692A
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weight
viscoelastic
layer
damping material
elastic modulus
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Joji Yamada
穣二 山田
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Sekisui Chemical Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping material having excellent vibration damping properties. <P>SOLUTION: The damping material A is formed by successively laminating and integrating two layers of viscoelastic layers C1, C2 on one surface of an organic compound layer B. A ratio [tan(δ1)] between a loss elastic modulus and storage elastic modulus in the inside viscoelastic layer and a ratio [tan(δ2)] between a loss elastic modulus and storage elastic modulus in the outside viscoelastic layer have a prescribed relationship so that the thickness of a whole viscoelastic layer can be reduced while delivering excellent vibration damping properties. As a result, the damping material can be favorably employed even in a narrow space portion in an automobile component, electrical appliance or the like. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、優れた制振性を有する制振材に関する。   The present invention relates to a vibration damping material having excellent vibration damping properties.

従来から、電化製品ではモーターなどの駆動装置の振動を低減させるために制振材が用いられており、その他に、建築用途では折板屋根などにおける雨音の低減のために制振材が、自動車用途では走行中に発生する振動によって屋根や扉などが微振動することに起因する振動音やエンジンなどの駆動系の振動を低減するために制振材が用いられている。   Conventionally, vibration control materials have been used to reduce vibrations of drive devices such as motors in electrical appliances.In addition, vibration control materials have been used to reduce rain noise on folded plate roofs, etc. In automobile applications, a damping material is used to reduce vibration noise caused by the vibration of the roof, doors, etc. caused by vibration generated during traveling and vibration of the drive system such as the engine.

このような制振材としては、特許文献1に、ゴム又は熱可塑性エラストマー、熱可塑性樹脂及び無機粉体からなる制振性シート基材の一面にポリエチレンテレフタレート樹脂層が積層されてなる折板屋根用制振シートが提案されている。   As such a damping material, Patent Document 1 discloses a folded plate roof in which a polyethylene terephthalate resin layer is laminated on one surface of a damping sheet base material made of rubber or thermoplastic elastomer, thermoplastic resin and inorganic powder. A vibration damping sheet has been proposed.

そして、制振材の制振性能は、その一部に粘弾性を有する高分子化合物を用いていることから温度依存性を有している。具体的には、制振材の制振性能は、損失弾性率と貯蔵弾性率の比(tanδ)で表され、この数値が大きいほど制振性能が高い。   And the damping performance of the damping material has temperature dependency because a polymer compound having viscoelasticity is used for a part thereof. Specifically, the damping performance of the damping material is represented by the ratio of loss elastic modulus to storage elastic modulus (tan δ). The larger this value, the higher the damping performance.

即ち、制振材は、損失弾性率と貯蔵弾性率の比(tanδ)が最大値をとるような設計を行うことで制振性能を向上させている。しかし、損失弾性率と貯蔵弾性率の比(tanδ)がある一定以上になると、粘着剤層がベトついたり、タレが発生するなど、取り付けや加工上の不具合を生じさせることが多かった。   That is, the damping material improves the damping performance by designing so that the ratio of loss elastic modulus to storage elastic modulus (tan δ) takes a maximum value. However, when the ratio of loss elastic modulus to storage elastic modulus (tan δ) exceeds a certain value, there are many problems in mounting and processing, such as stickiness of the pressure-sensitive adhesive layer and sagging.

特開平10−183883号公報Japanese Patent Laid-Open No. 10-183883

本発明は、制振性及び作業性に優れた制振材を提供する。   The present invention provides a vibration damping material excellent in vibration damping performance and workability.

本発明の制振材Aは、図1に示したように、有機化合物層Bの一面に二層の粘弾性層C1、C2が順次、積層一体化されており、内側の粘弾性層C1における損失弾性率と貯蔵弾性率との比[tan(δ1)]と、外側の粘弾性層C2における損失弾性率と貯蔵弾性率との比[(tanδ2)]とが式1及び式2を満たすことを特徴とする制振材。
0.5≦tan(δ1)≦tan(δ2) ・・・式1
1≦tan(δ2) ・・・式2
In the damping material A of the present invention, as shown in FIG. 1, two viscoelastic layers C1 and C2 are sequentially laminated and integrated on one surface of the organic compound layer B. In the inner viscoelastic layer C1, The ratio of loss elastic modulus to storage elastic modulus [tan (δ1)] and the ratio of loss elastic modulus to storage elastic modulus [(tan δ2)] in the outer viscoelastic layer C2 satisfy Equation 1 and Equation 2. Damping material characterized by
0.5 ≦ tan (δ1) ≦ tan (δ2) Equation 1
1 ≦ tan (δ2) ・ ・ ・ Formula 2

上記制振材Aの粘弾性層C1、C2は、制振材Aの制振性能を決定づける重要な層であり、制振材Aの制振性能は、粘弾性層C1、C2を構成している樹脂の粘弾性に依存することが知られている。そして、粘弾性層C1、C2を構成している樹脂の粘弾性パラメータとしては、(損失弾性率G”/貯蔵弾性率G’)、即ち、tanδが代表的であり、このtanδは樹脂に特有のパラメータであり、この値が大きいほど制振性能が高い。   The viscoelastic layers C1 and C2 of the damping material A are important layers that determine the damping performance of the damping material A. The damping performance of the damping material A constitutes the viscoelastic layers C1 and C2. It is known to depend on the viscoelasticity of the resin. The viscoelastic parameters of the resins constituting the viscoelastic layers C1 and C2 are typically (loss elastic modulus G ″ / storage elastic modulus G ′), that is, tanδ, which is specific to the resin. The greater the value, the higher the damping performance.

本発明では、制振材Aの制振性能を左右する粘弾性層C1,C2を二層、有機化合物層Bの一面に順次、積層一体化させ、粘弾性層C1のtan(δ1)と、粘弾性層C2のtan(δ2)とが上記式1及び式2を満たすように調整している。   In the present invention, two viscoelastic layers C1 and C2 that affect the damping performance of the damping material A are sequentially laminated and integrated on one surface of the organic compound layer B, and tan (δ1) of the viscoelastic layer C1 is obtained. The tan (δ2) of the viscoelastic layer C2 is adjusted so as to satisfy the above formulas 1 and 2.

具体的には、本発明では、粘弾性層C1のtan(δ1)を0.5以上に限定することによって制振材に最低限の制振性を付与していると共に、粘弾性層C1のtan(δ1)を粘弾性層C2のtan(δ2)と等しいか或いは小さくなるように調整していることによって、粘弾性層C1を粘弾性層C2にとっての拘束層の役割を持たせている。更に、粘弾性層C2のtan(δ2)を1以上とすることによって、制振材の制振性能を優れたものとすることができる。粘弾性層の厚みは厚ければよいというわけではなく、一定の厚みを超えると、それ以上厚みを増しても、制振材の制振性能はあまり向上しない。そこで、本発明の制振材のように、振動体側から順番に粘弾性層のtanδを小さくしていくことで、擬似的に、厚みの小さな制振材を幾重にも積層した構成をなすことが可能となり、その結果、本発明の制振材Aは、その粘弾性層C1、C2の厚みが薄いにもかかわらず、優れた制振性能を発揮する。   Specifically, in the present invention, the minimum damping property is imparted to the damping material by limiting the tan (δ1) of the viscoelastic layer C1 to 0.5 or more, and the viscoelastic layer C1 By adjusting tan (δ1) to be equal to or smaller than tan (δ2) of the viscoelastic layer C2, the viscoelastic layer C1 serves as a constraining layer for the viscoelastic layer C2. Furthermore, by setting the tan (δ2) of the viscoelastic layer C2 to 1 or more, the damping performance of the damping material can be improved. The thickness of the viscoelastic layer is not necessarily thick. If the thickness exceeds a certain thickness, the damping performance of the damping material is not improved so much even if the thickness is further increased. Therefore, as in the vibration damping material of the present invention, by gradually reducing the tan δ of the viscoelastic layer from the vibrating body side, a structure in which a number of damping materials with small thicknesses are stacked in layers is formed. As a result, the damping material A of the present invention exhibits excellent damping performance even though the viscoelastic layers C1 and C2 are thin.

そして、内側の粘弾性層C1のtan(δ1)は、大きすぎると、粘弾性層C2に対する拘束層としての働きを失い、制振材A全体の制振性能が低下することがあるので、0.5〜1が好ましい。   If the tan (δ1) of the inner viscoelastic layer C1 is too large, the function as a constraining layer for the viscoelastic layer C2 may be lost, and the damping performance of the entire damping material A may be reduced. .5 to 1 are preferred.

又、外側の粘弾性層C2の損失弾性率と貯蔵弾性率との比(tanδ2)は、大きすぎると、粘弾性層C2の表面がべとつき、制振材の取扱性が低下することがあるので、0.8〜2.0が好ましい。   Also, if the ratio of loss elastic modulus to storage elastic modulus (tan δ2) of the outer viscoelastic layer C2 is too large, the surface of the viscoelastic layer C2 may become sticky, and the handling property of the damping material may deteriorate. 0.8 to 2.0 is preferable.

なお、粘弾性層C1、C2における損失弾性率と貯蔵弾性率との比(tanδ)は、JIS K7244に準拠して動的ズリ粘弾性測定周波数10Hz、歪み量0.5%の条件下にて測定されたものをいう。粘弾性層C1、C2における損失弾性率と貯蔵弾性率との比(tanδ)は温度依存性を有しているが、粘弾性層C1、C2における損失弾性率と貯蔵弾性率との比(tanδ)を比較する場合には、同一温度にて測定した、損失弾性率と貯蔵弾性率との比(tanδ)を採用する。   In addition, the ratio (tan δ) between the loss elastic modulus and the storage elastic modulus in the viscoelastic layers C1 and C2 is a dynamic shear viscoelasticity measurement frequency of 10 Hz and a strain amount of 0.5% in accordance with JIS K7244. It means what was measured. The ratio of loss elastic modulus to storage elastic modulus (tanδ) in the viscoelastic layers C1, C2 has temperature dependence, but the ratio of loss elastic modulus to storage elastic modulus (tanδ) in the viscoelastic layers C1, C2. ), The ratio of loss elastic modulus to storage elastic modulus (tan δ) measured at the same temperature is employed.

上記制振材Aの有機化合物層Bとしては非発泡層又は発泡層の何れであってもよいが、制振材Aが軽量性に優れている点で発泡層であることが好ましい。そして、上記有機化合物層Bを構成する有機化合物としては、特に限定されず、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン、直鎖状低密度ポリエチレン、エチレン−酢酸ビニルなどのポリエチレン系樹脂や、プロピレン単独重合体、プロピレンと他のオレフィンとの共重合体などのポリプロピレン系樹脂などのポリオレフィン系樹脂の他に、ポリスチレン系樹脂、ポリエステル系樹脂、ポリアミド系樹脂、ポリイミド系樹脂、石油樹脂などの熱可塑性樹脂などが挙げられ、制振材が剛性に優れており、取扱中に撓みや反りが発生しにくく作業性に優れている点で、ポリオレフィン系樹脂が好ましい。   The organic compound layer B of the damping material A may be either a non-foamed layer or a foamed layer, but is preferably a foamed layer because the damping material A is excellent in lightness. And as an organic compound which constitutes the above-mentioned organic compound layer B, it is not particularly limited, polyethylene resins such as high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate, In addition to polyolefin resins such as propylene homopolymers and polypropylene resins such as copolymers of propylene and other olefins, heat such as polystyrene resins, polyester resins, polyamide resins, polyimide resins, petroleum resins, etc. Examples thereof include plastic resins, and a polyolefin-based resin is preferable in that the vibration damping material is excellent in rigidity, is less likely to bend and warp during handling, and is excellent in workability.

更に、有機化合物層Bが熱可塑性樹脂発泡シートからなる場合、熱可塑性樹脂発泡シートの見掛け密度は、小さいと、制振材の防音性や制振性が低下することがある一方、大きいと、制振材の軽量性が低下することがあるので、0.02〜0.2g/cm3が好ましく、0.03〜0.1g/cm3がより好ましい。 Furthermore, when the organic compound layer B is made of a thermoplastic resin foam sheet, if the apparent density of the thermoplastic resin foam sheet is small, the soundproofing and vibration damping properties of the vibration damping material may be reduced, while if large, 0.02 to 0.2 g / cm 3 is preferable and 0.03 to 0.1 g / cm 3 is more preferable because the lightness of the damping material may be lowered.

又、上記熱可塑性樹脂発泡シートの厚みは、薄いと、制振材の防音性や機械的強度が低下することがある一方、厚いと、制振材を巻き取る際に制振材に皺が発生するなど、制振材の取扱性が低下することがあるので、1〜4mmが好ましい。   If the thickness of the thermoplastic resin foam sheet is thin, the soundproofing and mechanical strength of the vibration damping material may be reduced. On the other hand, if the thickness is too large, wrinkles will occur on the vibration damping material when winding the vibration damping material. Since the handleability of the vibration damping material may be reduced, such as being generated, 1 to 4 mm is preferable.

又、有機化合物層Bが非発泡熱可塑性樹脂シートの場合は、薄いと、制振材の防音性や機械的強度が低下することがある一方、厚いと、制振材を巻き取る際に制振材に皺が発生するなど、制振材の取扱性が低下することがあるので、0.1〜0.6mmが好ましい。   In the case where the organic compound layer B is a non-foamed thermoplastic resin sheet, if it is thin, the soundproofing and mechanical strength of the vibration damping material may be reduced. Since handleability of the vibration damping material may be reduced, such as wrinkles generated in the vibration material, 0.1 to 0.6 mm is preferable.

上記粘弾性層C1、C2は、発泡粘着剤層や上記熱可塑性樹脂発泡シートなどが挙げられる。粘弾性層C1、C2が発泡粘着剤層である場合、粘弾性層C1、C2を構成する粘着剤としては、特に限定されず、例えば、ウレタン系粘着剤、アクリル系粘着剤などが挙げられ、アクリル系粘着剤を含有していることが好ましい。   Examples of the viscoelastic layers C1 and C2 include a foamed pressure-sensitive adhesive layer and the thermoplastic resin foam sheet. When the viscoelastic layers C1 and C2 are foamed adhesive layers, the adhesive constituting the viscoelastic layers C1 and C2 is not particularly limited, and examples thereof include urethane adhesives and acrylic adhesives. It preferably contains an acrylic pressure-sensitive adhesive.

次に、本発明の制振材Aの製造方法について説明する。先ず、有機化合物層Bの製造方法について説明する。有機化合物層Bが発泡層である場合、発泡層の製造方法としては特に限定されず、例えば、(1)熱可塑性樹脂及び熱分解型発泡剤からなる発泡性樹脂組成物をラボプラストミルなどの汎用の攪拌装置に供給して溶融混練した上でプレス成形などの汎用の成形方法によって発泡性樹脂シートを作製し、この発泡性樹脂シートに、必要に応じて電子線、α線、β線などの電離性放射線を照射することによって発泡性樹脂シートを架橋した後、発泡性樹脂シートを熱分解型発泡剤の分解温度以上の温度に加熱して発泡させて熱可塑性樹脂発泡シートを製造する方法、(2)熱可塑性樹脂及び熱分解型発泡剤からなる発泡性樹脂組成物を押出機に供給して溶融混練して押出機から発泡性樹脂シートを連続的に押出し、この発泡性樹脂シートに必要に応じて電子線、α線、β線などの電離性放射線を照射することによって発泡性樹脂シートを架橋した後、発泡性樹脂シートを熱分解型発泡剤の分解温度以上の温度に加熱して発泡させて熱可塑性樹脂発泡シートを連続的に製造する方法などが挙げられる。   Next, the manufacturing method of the damping material A of this invention is demonstrated. First, the manufacturing method of the organic compound layer B will be described. When the organic compound layer B is a foam layer, the method for producing the foam layer is not particularly limited. For example, (1) a foamable resin composition composed of a thermoplastic resin and a pyrolytic foaming agent is used as a lab plast mill or the like. After supplying to a general-purpose agitator and melt-kneading, a foamable resin sheet is produced by a general-purpose molding method such as press molding, and an electron beam, α-ray, β-ray, etc., as necessary. A method for producing a thermoplastic resin foam sheet by crosslinking a foamable resin sheet by irradiating the ionizing radiation and heating the foamable resin sheet to a temperature equal to or higher than the decomposition temperature of the pyrolytic foaming agent (2) A foamable resin composition comprising a thermoplastic resin and a thermally decomposable foaming agent is supplied to an extruder, melted and kneaded, and the foamable resin sheet is continuously extruded from the extruder. As needed Next, the foamable resin sheet is cross-linked by irradiating with ionizing radiation such as electron beam, α ray, β ray, etc., and then the foamable resin sheet is heated to a temperature equal to or higher than the decomposition temperature of the thermally decomposable foaming agent to foam. And a method of continuously producing a thermoplastic resin foam sheet.

なお、上記熱分解型発泡剤としては、従来から発泡シートの製造に用いられているものであれば、特に限定されず、例えば、アゾジカルボンアミド、ベンゼンスルホニルヒドラジド、ジニトロソペンタメチレンテトラミン、トルエンスルホニルヒドラジド、4,4−オキシビス(ベンゼンスルホニルヒドラジド)などが挙げられ、これらは単独で用いられても二種類以上が併用されてもよい。   The pyrolytic foaming agent is not particularly limited as long as it is conventionally used in the production of foamed sheets. For example, azodicarbonamide, benzenesulfonylhydrazide, dinitrosopentamethylenetetramine, toluenesulfonyl Examples thereof include hydrazide and 4,4-oxybis (benzenesulfonylhydrazide), and these may be used alone or in combination of two or more.

又、上記有機化合物層Bが非発泡層である場合、非発泡層の製造方法としては、例えば、熱可塑性樹脂を押出機に供給して溶融混練し、押出機からシート状に押出す熱可塑性樹脂シートの製造方法が挙げられる。   When the organic compound layer B is a non-foamed layer, the non-foamed layer can be produced by, for example, supplying thermoplastic resin to an extruder, melt-kneading, and extruding into a sheet from the extruder The manufacturing method of a resin sheet is mentioned.

上記粘弾性層C1、C2を製造する方法としては、汎用されている方法を用いることができる。粘弾性層が発泡粘着剤層から形成されている場合は、例えば、粘着剤のエマルジョンに空気を混合して発泡させた後、この発泡粘着剤エマルジョンを任意の面に所定厚みで塗布して乾燥させる方法が挙げられる。粘弾性層が熱可塑性樹脂発泡シートから形成されている場合には、上述の要領で作製される。   As a method for producing the viscoelastic layers C1 and C2, a widely used method can be used. When the viscoelastic layer is formed of a foamed pressure-sensitive adhesive layer, for example, after air is mixed with the pressure-sensitive adhesive emulsion and foamed, the foamed pressure-sensitive adhesive emulsion is applied to a given surface with a predetermined thickness and dried. The method of letting it be mentioned. When the viscoelastic layer is formed from a thermoplastic resin foam sheet, the viscoelastic layer is produced as described above.

更に、粘弾性層が発泡粘着剤層から形成されている場合、粘弾性層C1、C2中に架橋剤を含有させて粘弾性層C1、C2を架橋させることによって、粘弾性層C1、C2の粘弾性による制振性能を維持しつつ粘弾性層C1、C2の厚み精度を向上させることができる。このような架橋剤としては、粘弾性層C1、C2を架橋させることができれば、特に限定されず、例えば、エポキシ系架橋剤、アミン系架橋剤、シラン系架橋剤などが挙げられる。   Furthermore, when the viscoelastic layer is formed from a foamed adhesive layer, the viscoelastic layers C1 and C2 are cross-linked by adding a crosslinking agent in the viscoelastic layers C1 and C2, thereby cross-linking the viscoelastic layers C1 and C2. The thickness accuracy of the viscoelastic layers C1 and C2 can be improved while maintaining the vibration damping performance by viscoelasticity. Such a crosslinking agent is not particularly limited as long as the viscoelastic layers C1 and C2 can be crosslinked, and examples thereof include an epoxy crosslinking agent, an amine crosslinking agent, and a silane crosslinking agent.

又、粘弾性層が発泡粘着剤層から形成されている場合、粘弾性層C1、C2中における架橋剤の含有量としては、多いと、粘弾性層の架橋密度が高くなり過ぎて、粘弾性層の粘弾性による制振性能が却って低下することがあるので、粘弾性層C1、C2を構成する樹脂成分100重量部に対して6重量部以下が好ましく、0.2〜4重量部がより好ましい。   In addition, when the viscoelastic layer is formed from a foamed adhesive layer, if the content of the crosslinking agent in the viscoelastic layers C1 and C2 is large, the crosslinking density of the viscoelastic layer becomes too high, and the viscoelastic layer Since the vibration damping performance due to the viscoelasticity of the layer may deteriorate, the amount is preferably 6 parts by weight or less, more preferably 0.2 to 4 parts by weight with respect to 100 parts by weight of the resin component constituting the viscoelastic layers C1 and C2. preferable.

そして、粘弾性層C1、C2の密度は、低いと、粘弾性層の粘弾性による制振性能が低下することがある一方、高いと、制振材の軽量性が低下することがあるので、0.05〜1g/cm3が好ましく、0.1〜1g/cm3がより好ましく、0.15〜1g/cm3が特に好ましい。 And, if the density of the viscoelastic layers C1, C2 is low, the vibration damping performance due to the viscoelasticity of the viscoelastic layer may be reduced, whereas if it is high, the lightness of the vibration damping material may be reduced. 0.05-1 g / cm < 3 > is preferable, 0.1-1 g / cm < 3 > is more preferable, and 0.15-1 g / cm < 3 > is particularly preferable.

更に、粘弾性層C1、C2のそれぞれの厚みは、薄すぎるか、あるいは厚いすぎる場合、制振材の制振性が低下することがある一方、厚いと、制振材の軽量性が低下することがあるので、0.2〜3.0mmが好ましく、0.4〜2.0mmがより好ましい。   Furthermore, if the thickness of each of the viscoelastic layers C1 and C2 is too thin or too thick, the damping performance of the damping material may be reduced. On the other hand, if the thickness is too thick, the light weight of the damping material is reduced. Therefore, 0.2 to 3.0 mm is preferable, and 0.4 to 2.0 mm is more preferable.

次に、上記有機化合物層Bの一面に二層の粘弾性層C1、C2を順次、積層一体化して制振材Aを製造する方法としては、特に限定されず、例えば、熱可塑性樹脂発泡シート又は熱可塑性樹脂シートBの一面に両面粘着テープ又は粘着剤を介して粘弾性層C1を積層一体化し、更に、両面粘着テープを介して粘弾性層C1上に粘弾性層C2を積層一体化させて制振材Aを製造する方法、熱可塑性樹脂発泡シート又は熱可塑性樹脂シートBの一面に上記発泡粘着剤エマルジョンを直接塗布した後、発泡粘着剤エマルジョンを乾燥させて、熱可塑性樹脂発泡シート又は熱可塑性樹脂シートBの一面に粘弾性層C1を積層一体化し、更に、粘弾性層C1上に発泡粘着剤エマルジョンを直接塗布した後、発泡粘着剤エマルジョンを乾燥させて、粘弾性層C1上に粘弾性層C2を積層一体化させて制振材Aを製造する方法などが挙げられる。なお、粘弾性層C1における損失弾性率と貯蔵弾性率との比(tan(δ1))、粘弾性層C2における損失弾性率と貯蔵弾性率との比(tan(δ2))とが式1及び式2を満たすように調整する必要がある。   Next, the method of manufacturing the vibration damping material A by sequentially laminating and integrating the two viscoelastic layers C1 and C2 on one surface of the organic compound layer B is not particularly limited. For example, a thermoplastic resin foam sheet Alternatively, a viscoelastic layer C1 is laminated and integrated on one surface of the thermoplastic resin sheet B via a double-sided adhesive tape or adhesive, and a viscoelastic layer C2 is laminated and integrated on the viscoelastic layer C1 via a double-sided adhesive tape. A method of manufacturing the vibration damping material A, after directly applying the foamed adhesive emulsion on one surface of the thermoplastic resin foam sheet or thermoplastic resin sheet B, the foamed adhesive emulsion is dried, and the thermoplastic resin foam sheet or The viscoelastic layer C1 is laminated and integrated on one surface of the thermoplastic resin sheet B. Further, after the foamed adhesive emulsion is directly applied on the viscoelastic layer C1, the foamed adhesive emulsion is dried, and then on the viscoelastic layer C1. Viscoelastic layer C2 A method for producing a damping material A and the layers were integrated, and the like. Note that the ratio of the loss elastic modulus to the storage elastic modulus (tan (δ1)) in the viscoelastic layer C1 and the ratio of the loss elastic modulus to the storage elastic modulus (tan (δ2)) in the viscoelastic layer C2 are expressed by Equation 1 and It is necessary to adjust so as to satisfy Equation 2.

又、上記制振材Aの厚みは、薄いと、制振材の制振性が低下し或いは機械的強度が低下することがある一方、厚いと、制振材の軽量性が低下することがあるので、2〜7mmが好ましい。   Further, if the thickness of the damping material A is thin, the damping performance of the damping material may be reduced or the mechanical strength may be reduced. On the other hand, if the thickness is thick, the lightness of the damping material may be reduced. Since it exists, 2-7 mm is preferable.

なお、上記制振材Aとして、有機化合物層Bの一面に粘弾性層C1、C2が積層一体化された場合を説明したが、複数個の制振材A,A・・・を厚み方向に積層一体化させてもよい。この場合、熱可塑性樹脂発泡シートBと、粘弾性層C1,C2とが互いに交互になるように、複数個の制振材A、A・・・を積層する必要がある。   In addition, although the case where the viscoelastic layers C1 and C2 were laminated and integrated on one surface of the organic compound layer B was explained as the damping material A, a plurality of damping materials A, A. The layers may be integrated. In this case, it is necessary to laminate a plurality of damping materials A, A... So that the thermoplastic resin foam sheet B and the viscoelastic layers C1, C2 are alternately arranged.

そして、上記制振材Aは、その粘弾性層C2を振動体の表面に固着させて用いられるが、上記制振材Aは、成形性に優れた有機化合物層Bの一面に粘弾性層C1、C2を順次、積層一体化させてなるものであり優れた成形性を有していることから、振動体の形状に沿った形状に成形させることができる。   The vibration damping material A is used with its viscoelastic layer C2 fixed to the surface of the vibrating body. The vibration damping material A has a viscoelastic layer C1 on one surface of the organic compound layer B having excellent moldability. Since C2 is sequentially laminated and integrated and has excellent moldability, it can be formed into a shape that conforms to the shape of the vibrator.

従って、制振材Aを振動体の表面に該振動体との間に隙間を生じさせないように固着させることができ、振動体の振動エネルギーを制振材Aによって確実に熱エネルギーに変換して振動体の振動を減衰させ振動体の振動を低減させ或いは停止させることでき、更に、振動体の振動の低減或いは停止によって振動体から発生する騒音の低減或いは停止を図ることができる。   Therefore, the damping material A can be fixed to the surface of the vibrating body so as not to generate a gap between the vibrating body, and the vibration energy of the vibrating body can be reliably converted into thermal energy by the damping material A. It is possible to attenuate the vibration of the vibrating body to reduce or stop the vibration of the vibrating body, and to reduce or stop the noise generated from the vibrating body by reducing or stopping the vibration of the vibrating body.

そして、制振材Aは、有機化合物層Bが熱可塑性樹脂発泡シートである場合、熱可塑性樹脂発泡シートBによって防音性能をも付与することができ、振動体から発生する騒音の遮蔽効果も発揮すると共に、制振材Aを挟んだ反対側から発生する騒音も遮蔽し、優れた防音性を発揮する。   When the organic compound layer B is a thermoplastic resin foam sheet, the vibration damping material A can also provide soundproofing performance by the thermoplastic resin foam sheet B, and also exhibits a shielding effect of noise generated from the vibrating body. In addition, noise generated from the opposite side across the damping material A is also shielded, and excellent soundproofing properties are exhibited.

なお、制振材Aを振動体の表面に固着させる方法としては、例えば、両面粘着テープや粘着剤を用いて、制振材Aを振動体の表面に固着させる方法、制振材Aの粘弾性層C2の粘着力で、制振材Aを振動体の表面に固着させる方法などが挙げられる。又、制振材を成形する成形方法としては、従来から公知の成形方法を用いることができ、例えば、真空成形、圧空成形などが挙げられる。   As a method of fixing the damping material A to the surface of the vibrating body, for example, a method of fixing the damping material A to the surface of the vibrating body using a double-sided adhesive tape or an adhesive, For example, a method of fixing the damping material A to the surface of the vibrating body by the adhesive force of the elastic layer C2 can be used. In addition, as a molding method for molding the vibration damping material, a conventionally known molding method can be used, and examples thereof include vacuum molding and pressure molding.

本発明の制振材は、有機化合物層の一面に、式1及び式2を満たす二層の粘弾性層を順次、積層一体化しているので、優れた制振性能を発揮させつつ、粘弾性層全体の厚みを薄くすることができ、よって、自動車部品や電気製品のように狭い空間部においても好適に用いることができる。   In the vibration damping material of the present invention, two viscoelastic layers satisfying the formulas 1 and 2 are sequentially laminated and integrated on one surface of the organic compound layer, so that the viscoelasticity is exhibited while exhibiting excellent vibration damping performance. The thickness of the entire layer can be reduced, so that it can be suitably used even in a narrow space such as an automobile part or an electric product.

更に、上述のように、粘弾性層の厚みを薄くすることができるので、制振材の軽量性も図ることができ、軽量性が要求される用途にも広く用いることができる。  Furthermore, as described above, since the thickness of the viscoelastic layer can be reduced, the damping material can also be reduced in weight, and can be widely used in applications that require lightweight.

そして、上記制振材において、有機化合物層がポリオレフィン系樹脂発泡シートである場合には、ポリオレフィン系樹脂発泡シートが剛性に優れており、制振材の取扱中に、制振材に撓みや反りが発生しにくく、作業性に優れている。   In the vibration damping material, when the organic compound layer is a polyolefin resin foam sheet, the polyolefin resin foam sheet has excellent rigidity, and the vibration damping material is bent or warped during handling of the vibration damping material. Is less likely to occur and has excellent workability.

(実施例1)
直鎖状低密度ポリエチレン(出光社製 商品名「0238CN」)100重量部、アゾジカルボンアミド(大塚化学社製 商品名「SO−40」)6重量部、酸化防止剤(旭電化社製 商品名「アデカスタブAO−60」)1重量部、酸化防止剤(旭電化社製 商品名「アデカスタブCDA−1」)0.5重量部及び酸化防止剤(大内新興化学社製 商品名「ノクラック400S」)0.5重量部を押出機に供給して溶融混練して押出し、厚みが0.7mmの発泡性樹脂シートを得た。
Example 1
100 parts by weight of linear low density polyethylene (trade name “0238CN” manufactured by Idemitsu), 6 parts by weight of azodicarbonamide (trade name “SO-40” manufactured by Otsuka Chemical Co., Ltd.), antioxidant (trade name manufactured by Asahi Denka Co., Ltd.) "ADK STAB AO-60") 1 part by weight, antioxidant (trade name "ADK STAB CDA-1" manufactured by Asahi Denka Co., Ltd.) 0.5 part by weight and antioxidant (trade name "NOCRACK 400S" manufactured by Ouchi Shinsei Chemical Co., Ltd.) ) 0.5 part by weight was supplied to an extruder, melt-kneaded and extruded to obtain a foamable resin sheet having a thickness of 0.7 mm.

得られた発泡性樹脂シートの両面に電子線を加速電圧800kVで2.7Mrad照射して発泡性樹脂シートを架橋させた。次に、この発泡性樹脂シートを250℃に加熱して厚みが1.0mmで且つ密度が0.10g/cm3の熱可塑性樹脂発泡シートを得た。この熱可塑性樹脂発泡シートを粘弾性層C1とした。なお、粘弾性層C1の損失弾性率と貯蔵弾性率との比(tanδ1)を測定したところ、0.53であった。 The foamable resin sheet was cross-linked by irradiating an electron beam with an acceleration voltage of 2.7 Mrad at an acceleration voltage of 800 kV on both surfaces of the obtained foamable resin sheet. Next, this foamed resin sheet was heated to 250 ° C. to obtain a thermoplastic resin foam sheet having a thickness of 1.0 mm and a density of 0.10 g / cm 3 . This thermoplastic resin foam sheet was designated as viscoelastic layer C1. The ratio (tan δ1) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C1 was 0.53.

水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)90重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)10重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。   90 parts by weight of water-acrylic adhesive emulsion (trade name “Boncoat 350” manufactured by Dainippon Ink and Chemicals, Inc., acrylic adhesive component (resin component): 50% by weight), water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 10 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (product name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) ) 6 parts by weight of the mixture were uniformly mixed and then filtered to prepare a pressure-sensitive adhesive emulsion. The pressure-sensitive adhesive emulsion was mixed with air using a frothing device and foamed to prepare a foamed pressure-sensitive adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。上記発泡粘着剤層を粘弾性層C2とした。なお、粘弾性層C2の損失弾性率と貯蔵弾性率との比(tanδ2)を測定したところ、1.36であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release-treated surface, and applying the foamed adhesive emulsion to the release-treated surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. The foamed pressure-sensitive adhesive layer was designated as viscoelastic layer C2. The ratio (tan δ 2) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C2 was 1.36.

一方、エチレン−プロピレンブロック共重合体(出光興産株式会社製 商品名「E−253G」)100重量部を押出機に供給して溶融混練し、押出機の先端に取り付けたTダイから押出して厚みが0.4mmの非発泡のエチレン−プロピレンブロック共重合体シートを得た。   On the other hand, 100 parts by weight of an ethylene-propylene block copolymer (trade name “E-253G” manufactured by Idemitsu Kosan Co., Ltd.) is supplied to an extruder, melt-kneaded, and extruded from a T die attached to the tip of the extruder. A 0.4 mm non-foamed ethylene-propylene block copolymer sheet was obtained.

そして、エチレン−プロピレンブロック共重合体シートの一面に、両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して、粘弾性層C1を積層一体化させた後、粘弾性シートからポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C2を粘弾性層C1上に両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して積層一体化させて目付が0.071g/cm2の制振材を得た。 The viscoelastic layer C1 is laminated and integrated on one surface of the ethylene-propylene block copolymer sheet via a double-sided pressure-sensitive adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.). The terephthalate film is peeled and removed, and the viscoelastic layer C2 is laminated and integrated on the viscoelastic layer C1 via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.), and the basis weight is 0.071 g / cm 2. The damping material was obtained.

(実施例2)
エチレン−プロピレンランダム共重合体(チッソ社製 商品名「XK0235」45重量部、アイソタクチックホモポリプロピレン(出光社製 商品名「SH152」)15重量部、直鎖状低密度ポリエチレン(出光社製 商品名「0238CN」)40重量部、アゾジカルボンアミド(大塚化学社製 商品名「SO−40」)6重量部、架橋剤(共栄化学社製 商品名「TND−23H」)3重量部、酸化防止剤(旭電化社製 商品名「アデカスタブAO−60」)1重量部、酸化防止剤(旭電化社製 商品名「アデカスタブCDA−1」)0.5重量部及び酸化防止剤(大内新興化学社製 商品名「ノクラック400S」)0.5重量部を押出機に供給して溶融混練して押出し、厚みが0.7mmの発泡性樹脂シートを得た。
(Example 2)
Ethylene-propylene random copolymer (product name “XK0235” manufactured by Chisso Corporation) 45 parts by weight, isotactic homopolypropylene (product name “SH152” manufactured by Idemitsu Co., Ltd.) 15 parts by weight, linear low density polyethylene (product manufactured by Idemitsu Co., Ltd.) Name "0238CN") 40 parts by weight, azodicarbonamide (trade name "SO-40" manufactured by Otsuka Chemical Co., Ltd.) 6 parts by weight, cross-linking agent (trade name "TND-23H" manufactured by Kyoei Chemical Co., Ltd.) 3 parts by weight, antioxidant 1 part by weight of an agent (trade name “Adekastab AO-60” manufactured by Asahi Denka Co., Ltd.), 0.5 part by weight of an antioxidant (trade name “Adekastab CDA-1” manufactured by Asahi Denka Co., Ltd.) and an antioxidant (Ouchi Shinsei Chemical) 0.5 parts by weight of a product name “NOCRACK 400S” manufactured by the company was supplied to an extruder, melt-kneaded and extruded to obtain a foamable resin sheet having a thickness of 0.7 mm.

得られた発泡性樹脂シートの両面に電子線を加速電圧800kVで3.5Mrad照射して発泡性樹脂シートを架橋させた。次に、この発泡性樹脂シートを250℃に加熱して厚みが1.0mmで且つ密度が0.10g/cm3の熱可塑性樹脂発泡シートを得た。この熱可塑性樹脂発泡シートを粘弾性層C1とした。なお、粘弾性層C1の損失弾性率と貯蔵弾性率との比(tanδ1)を測定したところ、0.72であった。 The foamable resin sheet was cross-linked by irradiating an electron beam with an acceleration voltage of 800 kV for 3.5 Mrad on both surfaces of the obtained foamable resin sheet. Next, this foamed resin sheet was heated to 250 ° C. to obtain a thermoplastic resin foam sheet having a thickness of 1.0 mm and a density of 0.10 g / cm 3 . This thermoplastic resin foam sheet was designated as viscoelastic layer C1. The ratio (tan δ1) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C1 was 0.72.

水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)90重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)10重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。   Water-acrylic adhesive emulsion (trade name “Boncoat 350” manufactured by Dainippon Ink and Chemicals, Inc., acrylic adhesive component (resin component): 50% by weight) 90 parts by weight, water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 10 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (product name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) ) 6 parts by weight of the mixture were uniformly mixed and then filtered to prepare a pressure-sensitive adhesive emulsion. The pressure-sensitive adhesive emulsion was mixed with air using a frothing device and foamed to prepare a foamed pressure-sensitive adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。この発泡シートを粘弾性層C2とした。なお、粘弾性層C2の損失弾性率と貯蔵弾性率との比(tanδ2)を測定したところ、1.36であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release treatment surface, and applying the foamed adhesive emulsion to the release treatment surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. This foam sheet was designated as viscoelastic layer C2. The ratio (tan δ 2) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C2 was 1.36.

一方、エチレン−プロピレンブロック共重合体(出光興産株式会社製 商品名「E−253G」)100重量部を押出機に供給して溶融混練し、押出機の先端に取り付けたTダイから押出して厚みが0.4mmの非発泡のエチレン−プロピレンブロック共重合体シートを得た。   On the other hand, 100 parts by weight of an ethylene-propylene block copolymer (trade name “E-253G” manufactured by Idemitsu Kosan Co., Ltd.) is supplied to an extruder, melt-kneaded, and extruded from a T die attached to the tip of the extruder. A 0.4 mm non-foamed ethylene-propylene block copolymer sheet was obtained.

そして、エチレン−プロピレンブロック共重合体シートの一面に、両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して、粘弾性層C1を積層一体化させた後、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C2を粘弾性層C1上に両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して積層一体化させて目付が0.070g/cm2の制振材を得た。 Then, after the viscoelastic layer C1 is laminated and integrated on one surface of the ethylene-propylene block copolymer sheet via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.), the polyethylene of the viscoelastic sheet is obtained. After the terephthalate film was peeled and removed, the viscoelastic layer C2 was laminated and integrated on the viscoelastic layer C1 via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.), and the basis weight was 0.070 g / cm 2. The damping material was obtained.

(実施例3)
水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)80重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)20重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。
(Example 3)
80 parts by weight of water-acrylic adhesive emulsion (Dainippon Ink Chemical Co., Ltd., trade name “Boncoat 350”, acrylic adhesive component (resin component): 50% by weight), water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 20 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (trade name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) And filtered after uniformly mixed parts to prepare a pressure-sensitive adhesive emulsion, the adhesive emulsion was foamed by mixing air with the whisk to prepare a foaming adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。この発泡粘着剤層を粘弾性層C1とした。なお、粘弾性層C1の損失弾性率と貯蔵弾性率との比(tanδ1)を測定したところ、0.88であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release-treated surface, and applying the foamed adhesive emulsion to the release-treated surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. This foamed adhesive layer was designated as viscoelastic layer C1. The ratio (tan δ1) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C1 was 0.88.

水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)90重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)10重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。   90 parts by weight of water-acrylic adhesive emulsion (trade name “Boncoat 350” manufactured by Dainippon Ink and Chemicals, Inc., acrylic adhesive component (resin component): 50% by weight), water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 10 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (product name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) ) 6 parts by weight of the mixture were uniformly mixed and then filtered to prepare a pressure-sensitive adhesive emulsion. The pressure-sensitive adhesive emulsion was mixed with air using a frothing device and foamed to prepare a foamed pressure-sensitive adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。上記発泡粘着剤層を粘弾性層C2とした。なお、粘弾性層C2の損失弾性率と貯蔵弾性率との比(tanδ2)を測定したところ、1.36であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release-treated surface, and applying the foamed adhesive emulsion to the release-treated surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. The foamed pressure-sensitive adhesive layer was designated as viscoelastic layer C2. The ratio (tan δ 2) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C2 was 1.36.

一方、エチレン−プロピレンブロック共重合体(出光興産株式会社製 商品名「E−253G」)100重量部を押出機に供給して溶融混練し、押出機の先端に取り付けたTダイから押出して厚みが0.4mmの非発泡のエチレン−プロピレンブロック共重合体シートを得た。   On the other hand, 100 parts by weight of an ethylene-propylene block copolymer (trade name “E-253G” manufactured by Idemitsu Kosan Co., Ltd.) is supplied to an extruder, melt-kneaded, and extruded from a T die attached to the tip of the extruder. A 0.4 mm non-foamed ethylene-propylene block copolymer sheet was obtained.

そして、エチレン−プロピレンブロック共重合体シートの一面に、両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C1を積層一体化させた後、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C2を両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して粘弾性層C1上に積層一体化させて目付が0.081g/cm2の制振材を得た。 And after peeling off and removing the polyethylene terephthalate film of the viscoelastic sheet on one surface of the ethylene-propylene block copolymer sheet via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.), the viscoelastic layer C1 After peeling and removing the polyethylene terephthalate film of the viscoelastic sheet, the viscoelastic layer C2 is placed on the viscoelastic layer C1 via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.). A vibration damping material having a basis weight of 0.081 g / cm 2 was obtained by integrating the layers.

(比較例1)
エチレン−酢酸ビニル共重合体(三井デュポンポリケミカル社製 エバフレックス「EV460」)100重量部、アゾジカルボンアミド(大塚化学社製 商品名「SO−40」)6重量部、架橋剤(共栄化学社製 商品名「TND−23H」)3重量部、酸化防止剤(旭電化社製 商品名「アデカスタブAO−60」)1重量部、酸化防止剤(旭電化社製 商品名「アデカスタブCDA−1」)0.5重量部及び酸化防止剤(大内新興化学社製 商品名「ノクラック400S」)0.5重量部を押出機に供給して溶融混練して押出し、厚みが0.7mmの発泡性樹脂シートを得た。
(Comparative Example 1)
100 parts by weight of ethylene-vinyl acetate copolymer (Evaflex “EV460” manufactured by Mitsui DuPont Polychemical Co., Ltd.), 6 parts by weight of azodicarbonamide (trade name “SO-40” manufactured by Otsuka Chemical Co., Ltd.), cross-linking agent (Kyoei Chemical Co., Ltd.) Product name “TND-23H”) 3 parts by weight, antioxidant (Asahi Denka Co., Ltd. product name “Adeka Stub AO-60”) 1 part by weight, antioxidant (Asahi Denka Co., Ltd. product “Adeka Stub CDA-1”) ) 0.5 parts by weight and an antioxidant (trade name “NOCRACK 400S” manufactured by Ouchi Shinsei Chemical Co., Ltd.) are supplied to an extruder, melt-kneaded and extruded, and the foaming property is 0.7 mm. A resin sheet was obtained.

得られた発泡性樹脂シートの両面に電子線を加速電圧800kVで2.7Mrad照射して発泡性樹脂シートを架橋させた。次に、この発泡性樹脂シートを250℃に加熱して厚みが1.0mmで且つ密度が0.10g/cm3の熱可塑性樹脂発泡シートを得た。この発泡シートを粘弾性層C1とした。なお、粘弾性層C1の損失弾性率と貯蔵弾性率との比(tanδ1)を測定したところ、0.37であった。 The foamable resin sheet was cross-linked by irradiating an electron beam with an acceleration voltage of 2.7 Mrad at an acceleration voltage of 800 kV on both surfaces of the obtained foamable resin sheet. Next, this foamed resin sheet was heated to 250 ° C. to obtain a thermoplastic resin foam sheet having a thickness of 1.0 mm and a density of 0.10 g / cm 3 . This foam sheet was designated as viscoelastic layer C1. The ratio (tan δ1) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C1 was 0.37.

水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)90重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)10重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。   Water-acrylic adhesive emulsion (trade name “Boncoat 350” manufactured by Dainippon Ink and Chemicals, Inc., acrylic adhesive component (resin component): 50% by weight) 90 parts by weight, water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 10 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (product name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) ) 6 parts by weight of the mixture were uniformly mixed and then filtered to prepare a pressure-sensitive adhesive emulsion. The pressure-sensitive adhesive emulsion was mixed with air using a frothing device and foamed to prepare a foamed pressure-sensitive adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。この発泡粘着剤層を粘弾性層C2とした。なお、粘弾性層C2の損失弾性率と貯蔵弾性率との比(tanδ2)を測定したところ、1.36であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release-treated surface, and applying the foamed adhesive emulsion to the release-treated surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. This foamed adhesive layer was designated as viscoelastic layer C2. The ratio (tan δ 2) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C2 was 1.36.

一方、エチレン−プロピレンブロック共重合体(出光興産株式会社製 商品名「E−253G」)100重量部を押出機に供給して溶融混練し、押出機の先端に取り付けたTダイから押出して厚みが0.4mmの非発泡のエチレン−プロピレンブロック共重合体シートを得た。   On the other hand, 100 parts by weight of an ethylene-propylene block copolymer (trade name “E-253G” manufactured by Idemitsu Kosan Co., Ltd.) is supplied to an extruder, melt-kneaded, and extruded from a T die attached to the tip of the extruder. A 0.4 mm non-foamed ethylene-propylene block copolymer sheet was obtained.

そして、エチレン−プロピレンブロック共重合体シートの一面に、両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して粘弾性層C1を積層一体化させた後、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C2を両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して粘弾性層C1上に積層一体化させて0.070g/cm2の制振材を得た。 A viscoelastic layer C1 is laminated and integrated on one surface of an ethylene-propylene block copolymer sheet via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.), and then a polyethylene terephthalate of a viscoelastic sheet. After the film is peeled and removed, the viscoelastic layer C2 is laminated and integrated on the viscoelastic layer C1 via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.) to control vibration of 0.070 g / cm 2 . The material was obtained.

(比較例2)
水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)90重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)10重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。
(Comparative Example 2)
90 parts by weight of water-acrylic adhesive emulsion (trade name “Boncoat 350” manufactured by Dainippon Ink and Chemicals, Inc., acrylic adhesive component (resin component): 50% by weight), water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 10 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (product name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) And filtered after uniformly mixed parts to prepare a pressure-sensitive adhesive emulsion, the adhesive emulsion was foamed by mixing air with the whisk to prepare a foaming adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。この発泡粘着剤層を粘弾性層C1とした。なお、粘弾性層C1の損失弾性率と貯蔵弾性率との比(tanδ1)を測定したところ、1.36であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release-treated surface, and applying the foamed adhesive emulsion to the release-treated surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. This foamed adhesive layer was designated as viscoelastic layer C1. The ratio (tan δ1) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C1 was 1.36.

上記と同様の要領で粘弾性シートを作製し、得られた発泡粘着剤層を粘弾性層C2とした。なお、粘弾性層C2の損失弾性率と貯蔵弾性率との比(tanδ2)を測定したところ、1.36であった。   A viscoelastic sheet was prepared in the same manner as described above, and the obtained foamed adhesive layer was designated as viscoelastic layer C2. The ratio (tan δ 2) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C2 was 1.36.

一方、エチレン−プロピレンブロック共重合体(出光興産株式会社製 商品名「E−253G」)100重量部を押出機に供給して溶融混練し、押出機の先端に取り付けたTダイから押出して厚みが0.4mmの非発泡のエチレン−プロピレンブロック共重合体シートを得た。   On the other hand, 100 parts by weight of an ethylene-propylene block copolymer (trade name “E-253G” manufactured by Idemitsu Kosan Co., Ltd.) is supplied to an extruder, melt-kneaded, and extruded from a T die attached to the tip of the extruder. A 0.4 mm non-foamed ethylene-propylene block copolymer sheet was obtained.

そして、エチレン−プロピレンブロック共重合体シートの一面に、両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C1を積層一体化させ、更に、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C2を粘弾性層C1上に積層一体化させて目付が0.080g/cm2の制振材を得た。 And after peeling off and removing the polyethylene terephthalate film of the viscoelastic sheet on one surface of the ethylene-propylene block copolymer sheet via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.), the viscoelastic layer C1 In addition, after the polyethylene terephthalate film of the viscoelastic sheet is peeled and removed, the viscoelastic layer C2 is laminated and integrated on the viscoelastic layer C1 to obtain a vibration damping material having a basis weight of 0.080 g / cm 2. Obtained.

(比較例3)
水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)90重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)10重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。
(Comparative Example 3)
90 parts by weight of water-acrylic adhesive emulsion (trade name “Boncoat 350” manufactured by Dainippon Ink and Chemicals, Inc., acrylic adhesive component (resin component): 50% by weight), water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 10 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (product name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) And filtered after uniformly mixed parts to prepare a pressure-sensitive adhesive emulsion, the adhesive emulsion was foamed by mixing air with the whisk to prepare a foaming adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。上記発泡粘着剤層を粘弾性層C1とした。なお、粘弾性層C1の損失弾性率と貯蔵弾性率との比(tanδ1)を測定したところ、1.36であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release-treated surface, and applying the foamed adhesive emulsion to the release-treated surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. The foamed pressure-sensitive adhesive layer was designated as viscoelastic layer C1. The ratio (tan δ1) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C1 was 1.36.

水−アクリル系粘着剤エマルジョン(大日本インキ化学社製 商品名「ボンコート350」、アクリル系粘着剤成分(樹脂成分):50重量%)80重量部、水−ウレタン系粘着剤エマルジョン(大日本インキ化学社製 商品名「ハイドランHW−930」、ウレタン系粘着剤成分(樹脂成分):60重量%)20重量部、脂肪酸アンモニウム系気泡剤の水溶液(大日本インキ化学社製 商品名「F−1」、脂肪酸アンモニウム系気泡剤:32重量%)5重量部、エポキシ系架橋剤(大日本インキ化学社製 商品名「CR−5L」)1重量部、シリコーン系整泡剤(大日本インキ化学社製 商品名「ボンコートNBA−1」)0.5重量部及びカルボキシメチルセルロース水溶液(ダイセル化学工業社製、カルボキシメチルセルロース:4重量%)6重量部を均一に混合後に濾過して粘着剤エマルジョンを作製し、この粘着剤エマルジョンに泡立て器を用いて空気を混合して発泡させ、発泡粘着剤エマルジョンを作製した。   80 parts by weight of water-acrylic adhesive emulsion (Dainippon Ink Chemical Co., Ltd., trade name “Boncoat 350”, acrylic adhesive component (resin component): 50% by weight), water-urethane adhesive emulsion (Dainippon Ink) Product name “Hydran HW-930” manufactured by Kagaku Co., Ltd., 20 parts by weight of urethane-based adhesive component (resin component): 60% by weight, aqueous solution of fatty acid ammonium-based foaming agent (trade name “F-1” manufactured by Dainippon Ink & Chemicals, Inc.) ”, 5 parts by weight of a fatty acid ammonium-based foaming agent: 32% by weight, 1 part by weight of an epoxy-based crosslinking agent (trade name“ CR-5L ”manufactured by Dainippon Ink Chemical Co., Ltd.), a silicone-based foam stabilizer (Dainippon Ink Chemical Co., Ltd.) Product name “Boncoat NBA-1”) 0.5 part by weight and carboxymethylcellulose aqueous solution (Daicel Chemical Industries, Ltd., carboxymethylcellulose: 4% by weight) ) 6 parts by weight of the mixture were uniformly mixed and then filtered to prepare a pressure-sensitive adhesive emulsion. The pressure-sensitive adhesive emulsion was mixed with air using a frothing device and foamed to prepare a foamed pressure-sensitive adhesive emulsion.

次に、一面が離型処理面とされたポリエチレンテレフタレートフィルムを用意し、このポリエチレンテレフタレートフィルムの離型処理面に上記発泡粘着剤エマルジョンを均一な厚みとなるように塗布した後、発泡粘着剤エマルジョンの水分を蒸発、除去させて、ポリエチレンテレフタレートフィルム上に厚み1.0mmの発泡粘着剤層(密度:0.20g/cm3)を積層してなる粘弾性シートを作製した。上記発泡粘着剤層を粘弾性層C2とした。なお、粘弾性層C2の損失弾性率と貯蔵弾性率との比(tanδ2)を測定したところ、0.88であった。 Next, after preparing a polyethylene terephthalate film with one surface being a release-treated surface, and applying the foamed adhesive emulsion to the release-treated surface of the polyethylene terephthalate film so as to have a uniform thickness, the foamed adhesive emulsion The viscoelastic sheet formed by laminating a foamed pressure-sensitive adhesive layer (density: 0.20 g / cm 3 ) having a thickness of 1.0 mm on a polyethylene terephthalate film was prepared by evaporating and removing the water. The foamed pressure-sensitive adhesive layer was designated as viscoelastic layer C2. The ratio (tan δ 2) between the loss elastic modulus and the storage elastic modulus of the viscoelastic layer C2 was 0.88.

一方、エチレン−プロピレンブロック共重合体(出光興産株式会社製 商品名「E−253G」)100重量部を押出機に供給して溶融混練し、押出機の先端に取り付けたTダイから押出して厚みが0.4mmの非発泡のエチレン−プロピレンブロック共重合体シートを得た。   On the other hand, 100 parts by weight of an ethylene-propylene block copolymer (trade name “E-253G” manufactured by Idemitsu Kosan Co., Ltd.) is supplied to an extruder, melt-kneaded, and extruded from a T die attached to the tip of the extruder. A 0.4 mm non-foamed ethylene-propylene block copolymer sheet was obtained.

そして、エチレン−プロピレンブロック共重合体シートの一面に、両面粘着テープ(積水化学工業社製 商品名「No5761」)を介して、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C1を積層一体化させ、更に、粘弾性シートのポリエチレンテレフタレートフィルムを剥離除去した上で粘弾性層C2を粘弾性層C1上に積層一体化させて目付が0.081g/cm2の制振材を得た。 And after peeling off and removing the polyethylene terephthalate film of the viscoelastic sheet on one surface of the ethylene-propylene block copolymer sheet via a double-sided adhesive tape (trade name “No5761” manufactured by Sekisui Chemical Co., Ltd.), the viscoelastic layer C1 In addition, after the polyethylene terephthalate film of the viscoelastic sheet is peeled and removed, the viscoelastic layer C2 is laminated and integrated on the viscoelastic layer C1 to obtain a vibration damping material having a basis weight of 0.081 g / cm 2. Obtained.

得られた制振材の制振性を下記の要領で測定し、その結果を表1及び図2に示した。   The damping properties of the obtained damping material were measured in the following manner, and the results are shown in Table 1 and FIG.

〔制振性〕
JIS G0602に規定する中央支持定常加振法に準拠して300〜5000Hzにおける損失係数を測定した。具体的には、制振材から縦15mm×横250mmの平面長方形状の試験片を切り出し、この試験片をJIS G3141に規定されているSPCC鋼板(平面長方形状(縦15mm、横250mm)、厚さ1.0mm)上に両面粘着テープ(積水化学工業社製 商品名「セキスイテープNo.5761」)を介して貼着して300〜5000Hzにおける損失係数を測定し、図2及び表1、2にその結果を示した。なお、試験片を鋼板上に貼着させるにあたっては、試験片の粘弾性層が鋼板側となるようにした。
[Vibration control]
The loss factor at 300 to 5000 Hz was measured in accordance with the central support steady excitation method defined in JIS G0602. Specifically, a 15 mm long x 250 mm flat rectangular test piece was cut out from the damping material, and this test piece was cut into a SPCC steel plate (flat rectangular shape (15 mm long, 250 mm wide), thickness) specified in JIS G3141. 2) and a loss factor at 300 to 5000 Hz was measured by attaching the adhesive film on a double-sided adhesive tape (trade name “Sekisui Tape No. 5761” manufactured by Sekisui Chemical Co., Ltd.). The results are shown in. In addition, when sticking a test piece on a steel plate, it was made for the viscoelastic layer of a test piece to become a steel plate side.

なお、制振材が制振性能を発揮するためには低周波の損失係数が大きいことが重要であり、2000Hz以下における損失係数が0.1以上であると、制振材は十分な制振性能を有していると判断できる。   In order for the damping material to exhibit damping performance, it is important that the loss factor of low frequency is large, and if the loss factor at 2000 Hz or less is 0.1 or more, the damping material has sufficient damping performance. It can be judged that it has performance.

Figure 2009228692
Figure 2009228692

Figure 2009228692
Figure 2009228692

本発明の制振材を示した縦断面図である。It is the longitudinal cross-sectional view which showed the damping material of this invention. 実施例及び比較例で得られた制振材の制振性を示したグラフである。It is the graph which showed the damping property of the damping material obtained by the Example and the comparative example.

符号の説明Explanation of symbols

A 制振材
B 有機化合物層
C1、C2 粘弾性層
A Damping material B Organic compound layer
C1, C2 Viscoelastic layer

Claims (4)

有機化合物層の一面に二層の粘弾性層が順次、積層一体化されており、内側の粘弾性層における損失弾性率と貯蔵弾性率との比[tan(δ1)]と、外側の粘弾性層における損失弾性率と貯蔵弾性率との比[tan(δ2)]とが式1及び式2を満たすことを特徴とする制振材。
0.5≦tan(δ1)≦tan(δ2) ・・・式1
1≦tan(δ2) ・・・式2
Two viscoelastic layers are sequentially laminated and integrated on one surface of the organic compound layer. The ratio of loss elastic modulus to storage elastic modulus in the inner viscoelastic layer [tan (δ1)] and outer viscoelasticity A damping material characterized in that a ratio [tan (δ2)] of loss elastic modulus and storage elastic modulus in the layer satisfies Expressions 1 and 2.
0.5 ≦ tan (δ1) ≦ tan (δ2) Equation 1
1 ≦ tan (δ2) ・ ・ ・ Formula 2
内側の粘弾性層における損失弾性率と貯蔵弾性率との比[tan(δ1)]が0.5〜1であることを特徴とする制振材。 A damping material, wherein a ratio [tan (δ1)] of a loss elastic modulus and a storage elastic modulus in an inner viscoelastic layer is 0.5 to 1. 粘弾性層がアクリル系粘着剤を含むことを特徴とする請求項1又は請求項2に記載の制振材。 The damping material according to claim 1 or 2, wherein the viscoelastic layer contains an acrylic pressure-sensitive adhesive. 有機化合物層が、ポリオレフィン系樹脂発泡シートであることを特徴とする請求項1乃至請求項3の何れか1項に記載の制振材。 The vibration damping material according to any one of claims 1 to 3, wherein the organic compound layer is a polyolefin resin foam sheet.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107542824A (en) * 2017-10-13 2018-01-05 中国石油大学(华东) One kind imitates annelidan bionical shock-damping structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107542824A (en) * 2017-10-13 2018-01-05 中国石油大学(华东) One kind imitates annelidan bionical shock-damping structure

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