JP4941384B2 - High damping laminate - Google Patents
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- JP4941384B2 JP4941384B2 JP2008093670A JP2008093670A JP4941384B2 JP 4941384 B2 JP4941384 B2 JP 4941384B2 JP 2008093670 A JP2008093670 A JP 2008093670A JP 2008093670 A JP2008093670 A JP 2008093670A JP 4941384 B2 JP4941384 B2 JP 4941384B2
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- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
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- LVMTVPFRTKXRPH-UHFFFAOYSA-N penta-1,2-diene Chemical compound CCC=C=C LVMTVPFRTKXRPH-UHFFFAOYSA-N 0.000 description 1
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- Vibration Prevention Devices (AREA)
- Springs (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
本発明は、高減衰積層体に関する。 The present invention relates to a high attenuation laminate.
近年、震動エネルギーの吸収装置として、防震装置、除震装置、免震装置等が急速に普及しつつある。そして、このような装置としては、例えば、ゴムシートと鉄板とを交互に積層した積層体の上下面にフランジを固定した積層ゴム支承体が知られている。 In recent years, seismic isolation devices, seismic isolation devices, seismic isolation devices and the like are rapidly spreading as vibration energy absorbing devices. As such an apparatus, for example, a laminated rubber bearing body in which flanges are fixed to the upper and lower surfaces of a laminated body in which rubber sheets and iron plates are alternately laminated is known.
積層ゴム支承体としては、一般的に、高い剪断弾性率を持ったゴム材料により構成され、積層体の外周側面には、本体ゴムと同じ、或いは耐候性を付加させた外層(一般にEPDM等のポリマー)が設けられているが、本出願人は、特許文献1において「ゴムシートと鉄板とを交互に積層して積層体を構成し、該積層体の外周側面に外層ゴム積層して成る積層ゴム支承体において、前記外層ゴムのゴム材料を、前記積層体のゴムシートの破断伸びよりも大きい材料を使用して成る積層ゴム支承体。」を提案している。 The laminated rubber support is generally composed of a rubber material having a high shear modulus, and the outer peripheral side surface of the laminated body is the same as the main rubber or an outer layer with weather resistance added (generally, EPDM or the like). In Japanese Patent Application Laid-Open No. 2003-228867, the present applicant has disclosed that “a laminate is formed by alternately laminating rubber sheets and iron plates and laminating an outer layer rubber on the outer peripheral side surface of the laminate. In the rubber bearing body, a laminated rubber bearing body is proposed in which the rubber material of the outer layer rubber is a material larger than the breaking elongation of the rubber sheet of the laminated body.
しかしながら、上記特許文献1に記載の積層ゴム支承体は、加振後において、積層体のゴムシートが鉄板の間からはみ出すことにより、外層ゴム(以下、本発明においては「被覆ゴム」という。)層にしわが形成され、後述する比較例1で作製した積層体の写真(図3参照)に示すように、性能上は問題がなくても外観に劣るという問題があることが分かった。 However, the laminated rubber support described in Patent Document 1 has an outer layer rubber (hereinafter referred to as “coated rubber” in the present invention) by the rubber sheet of the laminated body protruding from between the iron plates after vibration. As shown in the photograph (see FIG. 3) of the laminate produced in Comparative Example 1 to be described later, it was found that there was a problem that the appearance was inferior even though there was no problem in performance.
そこで、本発明は、ゴム支承体としての性能を保持しつつ、加振後の外観にも優れる高減衰積層体の提供を目的とする。 Therefore, an object of the present invention is to provide a high-attenuation laminate that retains the performance as a rubber bearing body and is excellent in appearance after vibration.
本発明者は、上記課題を解決するために鋭意検討した結果、外周側面に形成する被覆ゴムを内層ゴム層および外層ゴム層の2層構造とし、これらの層を形成するゴム組成物(加硫物)の破断伸び、硬度および硬度差を特定の値にすることにより、ゴム支承体としての性能を保持しつつ、加振後の外観にも優れる高減衰積層体が得られることを知見し、本発明を完成させた。
即ち、本発明は、以下の(1)〜(4)を提供する。
As a result of diligent investigations to solve the above-mentioned problems, the present inventor has adopted a rubber composition (vulcanized) that forms a two-layer structure of an inner rubber layer and an outer rubber layer as the coating rubber formed on the outer peripheral side surface. It was found that by setting the elongation at break, hardness, and hardness difference of the product) to a specific value, a high-attenuation laminate excellent in appearance after vibration can be obtained while maintaining the performance as a rubber support, The present invention has been completed.
That is, the present invention provides the following (1) to (4).
(1)高減衰積層体用ゴム組成物と硬質板とが交互が積層し、外周側面に被覆ゴムを有する高減衰積層体であって、
上記被覆ゴムが、内層ゴム層および外層ゴム層の2層構造からなり、
上記内層ゴム層が、破断伸びが700%以上で硬度が65以下のゴム組成物から形成され、
上記外層ゴム層が、破断伸びが600%以上で硬度が75以上のゴム組成物から形成され、
上記内層ゴム層を形成する上記ゴム組成物と、上記外層ゴム層を形成する上記ゴム組成物との硬度の差が15以上である高減衰積層体。
(1) A high-attenuation laminate in which a rubber composition for a high-attenuation laminate and a hard plate are alternately laminated, and the outer peripheral side surface has a coating rubber,
The coated rubber has a two-layer structure of an inner rubber layer and an outer rubber layer,
The inner rubber layer is formed from a rubber composition having a breaking elongation of 700% or more and a hardness of 65 or less,
The outer rubber layer is formed from a rubber composition having an elongation at break of 600% or more and a hardness of 75 or more,
A high-damping laminate having a hardness difference of 15 or more between the rubber composition forming the inner rubber layer and the rubber composition forming the outer rubber layer.
(2)上記内層ゴム層の厚みと上記外層ゴム層の厚みとの比が、2:8〜8:2である上記(1)に記載の高減衰積層体。 (2) The high attenuation laminate according to (1) above, wherein the ratio of the thickness of the inner rubber layer to the thickness of the outer rubber layer is 2: 8 to 8: 2.
(3)上記外層ゴム層を形成する上記ゴム組成物が、ジエン系ゴム100質量部と、カーボンブラック60〜90質量部と、石油樹脂15〜50質量部とを含有する上記(1)または(2)に記載の高減衰積層体。 (3) The above (1) or (1), wherein the rubber composition forming the outer rubber layer contains 100 parts by mass of a diene rubber, 60 to 90 parts by mass of carbon black, and 15 to 50 parts by mass of petroleum resin. The high attenuation laminate according to 2).
(4)上記内層ゴム層を形成する上記ゴム組成物が、ジエン系ゴム100質量部と、カーボンブラック10〜55質量部と、石油樹脂20質量部以下とを含有する上記(1)〜(3)のいずれかに記載の高減衰積層体。 (4) The above (1) to (3), wherein the rubber composition forming the inner rubber layer contains 100 parts by mass of a diene rubber, 10 to 55 parts by mass of carbon black, and 20 parts by mass or less of petroleum resin. The high attenuation laminate according to any one of the above.
以下に説明するように、本発明によれば、ゴム支承体としての性能を保持しつつ、加振後の外観にも優れる高減衰積層体を提供することができる。 As will be described below, according to the present invention, it is possible to provide a high-attenuation laminate that retains the performance as a rubber bearing and is excellent in appearance after vibration.
以下に、本発明について詳細に説明する。
本発明の高減衰積層体(以下、「本発明の積層体」ともいう。)は、高減衰積層体用ゴム組成物と硬質板とが交互が積層し、外周側面に被覆ゴムを有する高減衰積層体であって、上記被覆ゴムが、内層ゴム層および外層ゴム層の2層構造からなり、
上記内層ゴム層が、破断伸びが700%以上で硬度が65以下のゴム組成物(以下、「内層ゴム組成物」ともいう。)から形成され、
上記外層ゴム層が、破断伸びが600%以上で硬度が75以上のゴム組成物(以下、「外層ゴム組成物」ともいう。)から形成され、
上記内層ゴム層を形成する上記ゴム組成物と、上記外層ゴム層を形成する上記ゴム組成物との硬度の差が15以上である高減衰積層体である。
次に、本発明の積層体を構成する高減衰積層体用ゴム組成物および硬質板ならびに内層ゴム組成物および外層ゴム組成物について説明する。
The present invention is described in detail below.
The high attenuation laminate of the present invention (hereinafter also referred to as “the laminate of the present invention”) is a high attenuation laminate in which a rubber composition for a high attenuation laminate and a hard plate are alternately laminated and a coating rubber is provided on the outer peripheral side surface. A laminated body, wherein the covering rubber has a two-layer structure of an inner rubber layer and an outer rubber layer,
The inner rubber layer is formed from a rubber composition (hereinafter also referred to as “inner rubber composition”) having an elongation at break of 700% or more and a hardness of 65 or less,
The outer rubber layer is formed from a rubber composition having a breaking elongation of 600% or more and a hardness of 75 or more (hereinafter also referred to as “outer layer rubber composition”).
A high attenuation laminate in which the difference in hardness between the rubber composition forming the inner rubber layer and the rubber composition forming the outer rubber layer is 15 or more.
Next, the rubber composition for a high attenuation laminate and the hard plate, the inner layer rubber composition and the outer layer rubber composition constituting the laminate of the present invention will be described.
[高減衰積層体用ゴム組成物]
本発明においては、上記高減衰積層体用ゴム組成物は特に限定されず、例えば、従来公知の積層ゴム支承体を構成するゴム層(ゴムシート)を形成するゴム組成物を用いることができる。
このようなゴム組成物としては、具体的には、例えば、ジエン系ゴム;カーボンブラック、シリカなどの無機充填剤;石油樹脂;加硫剤、加硫促進剤などの添加剤;等を含有する高減衰ゴム組成物が挙げられる。
[Rubber composition for highly attenuated laminate]
In the present invention, the rubber composition for the high attenuation laminate is not particularly limited, and for example, a rubber composition forming a rubber layer (rubber sheet) constituting a conventionally known laminated rubber support can be used.
Specifically, such a rubber composition contains, for example, a diene rubber; an inorganic filler such as carbon black or silica; a petroleum resin; an additive such as a vulcanizing agent or a vulcanization accelerator; A highly damped rubber composition may be mentioned.
<ジエン系ゴム>
上記ジエン系ゴムは特に限定されず、その具体例としては、天然ゴム(NR)、イソプレンゴム(IR)、ブタジエンゴム(BR)、スチレン−ブタジエン共重合体ゴム(SBR)、アクリロニトリル−ブタジエン共重合ゴム(NBR)、ブチルゴム(IIR)、ハロゲン化ブチルゴム(Br−IIR、Cl−IIR)、クロロプレンゴム(CR)等が挙げれる。
これらの中でも、モジュラス、引張強さ、切断時伸び等の物性と加工性等のバランスが良好となる理由からNRであるのが好ましく、減衰性、せん断弾性率の温度依存性をより低減させる理由からBRであるのが好ましい。
<Diene rubber>
The diene rubber is not particularly limited, and specific examples thereof include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), and acrylonitrile-butadiene copolymer. Examples thereof include rubber (NBR), butyl rubber (IIR), halogenated butyl rubber (Br-IIR, Cl-IIR), chloroprene rubber (CR) and the like.
Among these, NR is preferable because of a good balance between physical properties such as modulus, tensile strength, elongation at break, and workability, and the reason for further reducing the temperature dependence of damping property and shear modulus. To BR.
本発明においては、上記ジエン系ゴムをそれぞれ単独で用いてもよく、2種以上を併用してもよい。2種以上を併用する場合の上記ジエン系ゴムの好適な組み合わせとしては、ゴム成分同士の相溶性、加工性、グリーン強度および加硫物性に優れ、また、高減衰積層体の温度依存性と減衰性を確保できる観点から、例えば、NRとBR、IRとBR、NRとIRとBRが挙げられる。中でも、この特性により優れる点で、NRとBRが好ましい。これらの混合比率は特に限定されない。 In the present invention, the above diene rubbers may be used alone or in combination of two or more. As a suitable combination of the above diene rubbers when two or more kinds are used in combination, the rubber components are excellent in compatibility, processability, green strength and vulcanized physical properties, and the temperature dependence and damping of the high damping laminate. From the viewpoint of securing the property, for example, NR and BR, IR and BR, NR, IR and BR can be mentioned. Among these, NR and BR are preferable because they are more excellent in this characteristic. These mixing ratios are not particularly limited.
<無機充填剤>
上記無機充填剤は特に限定されず、その具体例としては、カーボンブラック、シリカ、T−クレー、カオリンクレー、ろう石クレー、セリサイトクレー、焼成クレー、けいそう土、重質炭酸カルシウム、炭酸マグネシウム、水酸化アルミニウム、硫酸バリウム、タルク、石英とカオリナイトとの凝集体等が挙げられる。
これらのうち、ゴムの補強効果が優れ、本発明の積層体のモジュラス、引張強さ、切断時伸び、せん断弾性率が優れる理由から、カーボンブラック、シリカであるのが好ましい。
<Inorganic filler>
The inorganic filler is not particularly limited, and specific examples thereof include carbon black, silica, T-clay, kaolin clay, wax stone clay, sericite clay, calcined clay, diatomaceous earth, heavy calcium carbonate, magnesium carbonate. , Aluminum hydroxide, barium sulfate, talc, aggregates of quartz and kaolinite, and the like.
Of these, carbon black and silica are preferred because they have excellent rubber reinforcing effects and are excellent in the modulus, tensile strength, elongation at break, and shear modulus of the laminate of the present invention.
(カーボンブラック)
本発明においては、カーボンブラックは、従来公知のものを使用することができる。
(Carbon black)
In the present invention, conventionally known carbon black can be used.
また、本発明においては、CTAB吸着比表面積が100m2/g以上のカーボンブラックを用いるのが好ましく、110〜370m2/gのカーボンブラックを用いるのがより好ましい。
CTAB吸着比表面積が100m2/g以上で範囲であると、得られる本発明の積層体の減衰性をより高く維持することができる。
ここで、CTAB吸着比表面積は、カーボンブラックがゴム分子との吸着に利用できる表面積を、CTAB(セチルトリメチルアンモニウムブロミド)の吸着により測定した値である。
このようなカーボンブラックとしては、例えば、SAF、ISAF、HAFを挙げることができる。なお、CATB吸着比表面積は、ASTM D3765−80に記載の方法により測定することができる。
In the present invention, carbon black having a CTAB adsorption specific surface area of 100 m 2 / g or more is preferably used, and carbon black of 110 to 370 m 2 / g is more preferably used.
When the CTAB adsorption specific surface area is in the range of 100 m 2 / g or more, the damping property of the laminate of the present invention obtained can be maintained higher.
Here, the CTAB adsorption specific surface area is a value obtained by measuring the surface area that carbon black can be used for adsorption with rubber molecules by adsorption of CTAB (cetyltrimethylammonium bromide).
Examples of such carbon black include SAF, ISAF, and HAF. The CATB adsorption specific surface area can be measured by the method described in ASTM D3765-80.
本発明においては、高減衰積層体用ゴム組成物におけるカーボンブラックの含有量は、ジエン系ゴム100質量部に対して、40〜75質量部でるのが好ましく、50〜75質量部であるのがより好ましい。
カーボンブラックの含有量がこの範囲であると、得られる本発明の積層体の減衰性が高く、せん断弾性率が良好となる。
In this invention, it is preferable that content of carbon black in the rubber composition for highly attenuated laminated bodies is 40 to 75 parts by mass, and 50 to 75 parts by mass with respect to 100 parts by mass of the diene rubber. More preferred.
When the content of carbon black is within this range, the resulting laminate of the present invention has high damping properties and good shear modulus.
(シリカ)
本発明においては、シリカは、従来公知のものを使用することができる。
シリカとしては、具体的には、例えば、ヒュームドシリカ、焼成シリカ、沈降シリカ、粉砕シリカ、溶融シリカ等を挙げることができる。
また、シリカは、平均凝集粒径が、5〜50μmのものが好ましく、5〜30μmのものがより好ましい。
(silica)
In the present invention, conventionally known silica can be used.
Specific examples of silica include fumed silica, calcined silica, precipitated silica, pulverized silica, and fused silica.
Silica preferably has an average aggregate particle diameter of 5 to 50 μm, more preferably 5 to 30 μm.
本発明においては、高減衰積層体用ゴム組成物におけるシリカの含有量は、ジエン系ゴム100質量部に対して、5〜35質量部であるのが好ましく、10〜30質量部であるのがより好ましい。
シリカの含有量がこの範囲であると、得られる本発明の積層体の減衰性が高く、せん断弾性率が良好となる。
In this invention, it is preferable that content of the silica in the rubber composition for highly attenuated laminated bodies is 5-35 mass parts with respect to 100 mass parts of diene rubbers, and it is 10-30 mass parts. More preferred.
When the content of silica is within this range, the resulting laminate of the present invention has high damping properties and good shear modulus.
<石油樹脂>
上記石油樹脂は特に限定されず、その具体例としては、C5系の脂肪族不飽和炭化水素の重合体、C9系の芳香族不飽和炭化水素の重合体、C5系の脂肪族不飽和炭化水素とC9系の芳香族不飽和炭化水素との共重合体等が挙げられる。
<Petroleum resin>
The petroleum resin is not particularly limited, and specific examples thereof include C5 aliphatic unsaturated hydrocarbon polymer, C9 aromatic unsaturated hydrocarbon polymer, and C5 aliphatic unsaturated hydrocarbon. And a copolymer of C9 aromatic unsaturated hydrocarbon.
C5系の脂肪族不飽和炭化水素としては、具体的には、例えば、ナフサの熱分解により得られるC5留分中に含まれる、1−ペンテン、2−ペンテン、2−メチル−1−ブテン、3−メチル−1−ブテン、2−メチル−2−ブテンのようなオレフィン系炭化水素;2−メチル−1,3−ブタジエン、1,2−ペンタジエン、1,3−ペンタジエン、3−メチル−1,2−ブタジエンのようなジオレフィン系炭化水素;等が挙げられる。
これらは、適当な触媒の存在下で、重合または共重合されることが可能である。ここで、C5系の脂肪族不飽和炭化水素の重合体とは、一種のC5系の脂肪族不飽和炭化水素の単独重合体と、二種以上のC5系の脂肪族不飽和炭化水素の共重合体のいずれをもいう。
Specific examples of the C5 aliphatic unsaturated hydrocarbon include, for example, 1-pentene, 2-pentene, 2-methyl-1-butene contained in a C5 fraction obtained by thermal decomposition of naphtha, Olefinic hydrocarbons such as 3-methyl-1-butene and 2-methyl-2-butene; 2-methyl-1,3-butadiene, 1,2-pentadiene, 1,3-pentadiene, 3-methyl-1 , 2-olefin hydrocarbons such as 2-butadiene;
These can be polymerized or copolymerized in the presence of a suitable catalyst. Here, the C5 aliphatic unsaturated hydrocarbon polymer is a co-polymer of a single C5 aliphatic unsaturated hydrocarbon homopolymer and two or more C5 aliphatic unsaturated hydrocarbons. It refers to any polymer.
C9系の芳香族不飽和炭化水素としては、具体的には、例えば、ナフサの熱分解により得られるC9留分中に含まれる、α−メチルスチレン、o−ビニルトルエン、m−ビニルトルエン、p−ビニルトルエンのようなビニル置換芳香族炭化水素等が挙げられる。
これらは、適当な触媒の存在下で、重合または共重合されることが可能である。ここで、C9系の芳香族不飽和炭化水素の重合体とは、一種のC9系の芳香族不飽和炭化水素の単独重合体と、二種以上のC9系の芳香族不飽和炭化水素の共重合体のいずれをもいう。
Specific examples of the C9 aromatic unsaturated hydrocarbon include, for example, α-methylstyrene, o-vinyltoluene, m-vinyltoluene, p contained in a C9 fraction obtained by thermal decomposition of naphtha. -Vinyl-substituted aromatic hydrocarbons such as vinyltoluene.
These can be polymerized or copolymerized in the presence of a suitable catalyst. Here, the C9 aromatic unsaturated hydrocarbon polymer is a co-polymer of a single C9 aromatic unsaturated hydrocarbon homopolymer and two or more C9 aromatic unsaturated hydrocarbons. It refers to any polymer.
また、C5系の脂肪族不飽和炭化水素とC9系の芳香族不飽和炭化水素との共重合体は、該共重合体の軟化点が高くなる点で、C9系の芳香族不飽和炭化水素ユニットが60モル%以上であるものが好ましく、90モル%以上であるものがより好ましい。
C5系の脂肪族不飽和炭化水素とC9系の芳香族不飽和炭化水素との共重合体は、適当な触媒の存在下で、共重合可能である。
In addition, a copolymer of a C5 aliphatic unsaturated hydrocarbon and a C9 aromatic unsaturated hydrocarbon is a C9 aromatic unsaturated hydrocarbon in that the softening point of the copolymer is high. What a unit is 60 mol% or more is preferable, and what is 90 mol% or more is more preferable.
A copolymer of a C5 aliphatic unsaturated hydrocarbon and a C9 aromatic unsaturated hydrocarbon can be copolymerized in the presence of a suitable catalyst.
上記石油樹脂は、ジエン系ゴムの物性に対し、その分子量および二重結合の反応性が影響を与えるので、軟化点(JIS K2207)が100℃以上のものが好ましく、120℃以上のものがより好ましい。 The above-mentioned petroleum resin has a molecular weight and a double bond reactivity affecting the physical properties of the diene rubber, so that the softening point (JIS K2207) is preferably 100 ° C. or higher, more preferably 120 ° C. or higher. preferable.
本発明においては、高減衰積層体用ゴム組成物における石油樹脂の含有量は、ジエン系ゴム100質量部に対して、5〜50質量部であるのが好ましく、10〜45質量部であるのがより好ましい。
石油樹脂の含有量がこの範囲であると、得られる本発明の積層体は、高い減衰性を維持しつつ、温度依存性が小さく、長期の繰り返しせん断変形に対する減衰性およびせん断弾性率が安定なものとなる。
In this invention, it is preferable that content of the petroleum resin in the rubber composition for highly attenuated laminated bodies is 5-50 mass parts with respect to 100 mass parts of diene rubbers, and is 10-45 mass parts. Is more preferable.
When the content of the petroleum resin is within this range, the obtained laminate of the present invention maintains high damping properties, has low temperature dependence, and is stable in damping properties and shear modulus against long-term repeated shear deformation. It will be a thing.
<添加剤>
上記添加剤としては、例えば、加硫剤、加硫促進剤、老化防止剤、可塑剤、軟化剤、加硫助剤、難燃剤、耐候剤、耐熱剤等が挙げられる。
加硫剤としては、具体的には、例えば、硫黄、酸化亜鉛;TMTDなどの有機含硫黄化合物;ジクミルペルオキシドなどの有機過酸化物;等が挙げられる。
加硫促進剤としては、具体的には、例えば、N−シクロヘキシル−2−ベンゾチアゾールスルフェンアミド(CBS)などのスルフェンアミド類;メルカプトベンゾチアゾールなどのチアゾール類;テトラメチルチウラムモノスルフィドなどのチウラム類;ステアリン酸;等が挙げられる。
老化防止剤としては、具体的には、例えば、TMDQなどのケトン・アミン縮合物;DNPDなどのアミン類;スチレン化フェノールなどのモノフェノール類;等が挙げられる。
可塑剤としては、具体的には、例えば、フタル酸誘導体(例えば、DBP、DOP等)、セバシン酸誘導体(例えば、DBS等)のモノエステル類等が挙げられる。
軟化剤としては、具体的には、例えば、パラフィン系オイル(プロセスオイル)等が挙げられる。
<Additives>
Examples of the additive include a vulcanizing agent, a vulcanization accelerator, an anti-aging agent, a plasticizer, a softening agent, a vulcanization aid, a flame retardant, a weathering agent, and a heat resistance agent.
Specific examples of the vulcanizing agent include sulfur and zinc oxide; organic sulfur-containing compounds such as TMTD; organic peroxides such as dicumyl peroxide; and the like.
Specific examples of the vulcanization accelerator include sulfenamides such as N-cyclohexyl-2-benzothiazole sulfenamide (CBS); thiazoles such as mercaptobenzothiazole; tetramethylthiuram monosulfide and the like. Thiurams; stearic acid; and the like.
Specific examples of the antiaging agent include ketone / amine condensates such as TMDQ; amines such as DNPD; monophenols such as styrenated phenol; and the like.
Specific examples of the plasticizer include phthalic acid derivatives (for example, DBP, DOP and the like), sebacic acid derivatives (for example, DBS and the like) monoesters, and the like.
Specific examples of the softening agent include paraffinic oil (process oil).
高減衰積層体用ゴム組成物の製造(調製)方法は、特に限定されないが、例えば、上述した各成分を配合した未加硫ゴム組成物を、公知の方法、装置を用いて、混練等により調製できる。 The production (preparation) method of the rubber composition for a highly attenuated laminate is not particularly limited. For example, the unvulcanized rubber composition containing the above-described components is kneaded using a known method and apparatus. Can be prepared.
[硬質板]
本発明においては、上記硬質板は特に限定されず、例えば、従来公知の積層ゴム支承体を構成する鉄板(一般構造用鋼板、冷間圧延鋼板等)を用いることができる。
[Hard plate]
In the present invention, the hard plate is not particularly limited, and for example, an iron plate (general structural steel plate, cold rolled steel plate, etc.) constituting a conventionally known laminated rubber bearing can be used.
[内層ゴム組成物]
上記内層ゴム層は、本発明の積層体の外周側面を被覆する2層構造の被覆ゴムの内層を構成するゴム層であって、破断伸びが700%以上で硬度が65以下のゴム組成物から形成される。
[Inner rubber composition]
The inner rubber layer is a rubber layer constituting an inner layer of a two-layered covering rubber that covers the outer peripheral side surface of the laminate of the present invention, and is formed from a rubber composition having a breaking elongation of 700% or more and a hardness of 65 or less. It is formed.
本発明においては、上記内層ゴム層を形成する上記ゴム組成物は、加硫後の破断伸びが700%以上で硬度が65以下となるゴム組成物であれば特に限定されないが、硬度は40以上であるのが好ましく、具体的には、ジエン系ゴム100質量部と、カーボンブラック10〜55質量部と、石油樹脂20質量部以下とを含有するゴム組成物が好適に例示される。
また、後述する外層ゴム組成物の加硫速度に近づける観点から、加硫剤および加硫促進剤の含有量を後述する外層ゴム組成物における含有量よりも減らし、スコーチ防止剤を含有するのが好ましい。
ここで、ジエン系ゴム、カーボンブラック等の組成成分については、上述した高減衰積層体用ゴム組成物に含有するものと同様である。
In the present invention, the rubber composition forming the inner rubber layer is not particularly limited as long as it has a rupture elongation after vulcanization of 700% or more and a hardness of 65 or less, but the hardness is 40 or more. Specifically, a rubber composition containing 100 parts by mass of a diene rubber, 10 to 55 parts by mass of carbon black, and 20 parts by mass or less of petroleum resin is preferably exemplified.
In addition, from the viewpoint of approaching the vulcanization rate of the outer layer rubber composition described later, the content of the vulcanizing agent and the vulcanization accelerator is less than the content in the outer layer rubber composition described later, and contains a scorch inhibitor. preferable.
Here, the composition components such as diene rubber and carbon black are the same as those contained in the rubber composition for a high attenuation laminate described above.
内層ゴム組成物の製造(調製)方法は、特に限定されないが、例えば、上述した各成分を配合した未加硫ゴム組成物を、公知の方法、装置を用いて、混練等により調製できる。 The method for producing (preparing) the inner layer rubber composition is not particularly limited. For example, an unvulcanized rubber composition containing the above-described components can be prepared by kneading using a known method and apparatus.
[外層ゴム組成物]
上記外層ゴム層は、本発明の積層体の外周側面を被覆する2層構造の被覆ゴムの外層を構成するゴム層であって、破断伸びが600%以上で硬度が75以上のゴム組成物から形成される。
[Outer rubber composition]
The outer rubber layer is a rubber layer constituting an outer layer of a two-layered covering rubber that covers the outer peripheral side surface of the laminate of the present invention, and is formed from a rubber composition having a breaking elongation of 600% or more and a hardness of 75 or more. It is formed.
本発明においては、上記外層ゴム層を形成するゴム組成物は、加硫後の破断伸びが600%以上で硬度が75以上となるゴム組成物であれば特に限定されないが、硬度は90以下であるのが好ましく、具体的には、上述した高減衰積層体用ゴム組成物と同様の組成物、具体的には、ジエン系ゴム100質量部と、カーボンブラック60〜90質量部と、石油樹脂15〜50質量部とを含有するゴム組成物が好適に例示される。 In the present invention, the rubber composition forming the outer rubber layer is not particularly limited as long as it has a rupture elongation after vulcanization of 600% or more and a hardness of 75 or more, but the hardness is 90 or less. Specifically, specifically, a composition similar to the above-described rubber composition for highly attenuated laminates, specifically, 100 parts by mass of diene rubber, 60 to 90 parts by mass of carbon black, and petroleum resin A rubber composition containing 15 to 50 parts by mass is preferably exemplified.
外層ゴム組成物の製造(調製)方法は、特に限定されないが、例えば、上述した各成分を配合した未加硫ゴム組成物を、公知の方法、装置を用いて、混練等により調製できる。 Although the manufacturing (preparation) method of an outer layer rubber composition is not specifically limited, For example, the unvulcanized rubber composition which mix | blended each component mentioned above can be prepared by kneading | mixing etc. using a well-known method and apparatus.
ここで、上述した内層ゴム組成物および外層ゴム組成物における破断伸びおよび硬度の値は、加硫後のゴム組成物の測定値をいい、本発明においては、以下に示す方法で測定した値である。 Here, the values of the elongation at break and the hardness in the inner layer rubber composition and the outer layer rubber composition described above are measured values of the rubber composition after vulcanization, and in the present invention, the values measured by the following method are used. is there.
<破断伸び>
未加硫ゴム組成物を148℃のプレス成型機を用い、面圧3.0MPaの圧力下で45分間加硫して、2mm厚の加硫シートを作製した。このシートからJIS3号ダンベル状の試験片を打ち抜き、引張速度500mm/分での引張試験をJIS K6251−2004に準拠して行い、切断時の伸び(EB)[%]を室温にて測定した。
<Elongation at break>
The unvulcanized rubber composition was vulcanized for 45 minutes under a surface pressure of 3.0 MPa using a press molding machine at 148 ° C. to prepare a vulcanized sheet having a thickness of 2 mm. A JIS No. 3 dumbbell-shaped test piece was punched from this sheet, a tensile test at a tensile speed of 500 mm / min was conducted in accordance with JIS K6251-2004, and elongation (E B ) [%] at the time of cutting was measured at room temperature. .
<硬度>
上記破断伸びと同様の試験片について、JIS K6253−1997の「タイプAデュロメータ硬さ試験」に準じて、ショアA硬度を測定した。
<Hardness>
About the test piece similar to the said breaking elongation, Shore A hardness was measured according to the "type A durometer hardness test" of JISK6253-1997.
また、本発明においては、上記内層ゴム組成物と、上記外層ゴム組成物との硬度の差が15以上であり、20以上であるのが好ましい。 In the present invention, the difference in hardness between the inner rubber composition and the outer rubber composition is 15 or more, preferably 20 or more.
このような内層ゴム組成物および外層ゴム組成物から構成される2層構造の被覆ゴムを有することにより、本発明の積層体は、ゴム支承体としての性能を保持しつつ、加振後の外観にも優れる。
これは、外層ゴム組成物により、上述した高減衰積層体用ゴム組成物が上述した硬質板の間からはみ出す力を抑制し、内層ゴム組成物により、このゴム層が硬質板により拘束(接着)されている部分の動きを緩和することができるためであると考えられる。
By having such a two-layered covering rubber composed of the inner layer rubber composition and the outer layer rubber composition, the laminate of the present invention maintains the performance as a rubber bearing body, and the appearance after vibration is applied. Also excellent.
This is because the outer layer rubber composition suppresses the force of the above-described rubber composition for a high-damping laminate from protruding from between the above-mentioned hard plates, and this rubber layer is constrained (adhered) by the hard plate by the inner-layer rubber composition. This is thought to be because the movement of the part that is present can be relaxed.
更に、本発明においては、上記内層ゴム層の厚みと上記外層ゴム層の厚みとの比が、2:8〜8:2であるのが好ましく、2:8〜6:4であるのがより好ましい。
上記内層ゴム層の厚みと上記外層ゴム層の厚みとの比がこの範囲にあると、得られる本発明の積層体の加振後の外観がより向上する。
Furthermore, in the present invention, the ratio of the thickness of the inner rubber layer to the thickness of the outer rubber layer is preferably 2: 8 to 8: 2, and more preferably 2: 8 to 6: 4. preferable.
When the ratio between the thickness of the inner rubber layer and the thickness of the outer rubber layer is within this range, the appearance of the obtained laminate of the present invention after vibration is further improved.
本発明の積層体は、上述した高減衰積層体用ゴム組成物と硬質板とを交互に積層し、外周側面に上述した内層ゴム組成物および外層ゴム組成物から構成される2層構造の被覆ゴムを有する高減衰積層体であり、橋梁の支承やビルの基礎免震等に用いられる構造体である。 The laminate of the present invention has a two-layer structure in which the above-described rubber composition for a high-attenuation laminate and a hard plate are alternately laminated, and the inner surface rubber composition and the outer layer rubber composition are formed on the outer peripheral side surface. It is a high-attenuation laminated body with rubber, and is a structure used for bridge support and building base isolation.
図1に、本発明の積層体の実施態様の一例を表す高減衰積層体の断面概略図を示す。
図1において、符号1は高減衰積層体(免震積層体)を表し、符号2は硬質板を表し、符号3は高減衰積層体用ゴム組成物を表す。また、符号4は被覆ゴムを表し、そのうち、符号4aは内層ゴム層、符号4bは外層ゴム層を表す。
In FIG. 1, the cross-sectional schematic of the high attenuation | damping laminated body showing an example of the embodiment of the laminated body of this invention is shown.
In FIG. 1, the code | symbol 1 represents a high attenuation | damping laminated body (seismic isolation laminated body), the code | symbol 2 represents a hard board, and the code | symbol 3 represents the rubber composition for high attenuation | damping laminated bodies. Reference numeral 4 represents a coated rubber, of which reference numeral 4a represents an inner rubber layer, and reference numeral 4b represents an outer rubber layer.
図1に一例として示すように、本発明の高減衰積層体1は、上述した高減衰積層体用ゴム組成物3と硬質板2とを交互に積層し、外周側面に上述した内層ゴム組成物から形成される内層ゴム層4aおよび上述した外層ゴム組成物から構成される外層ゴム層4bからなる被覆ゴム4を有する。
また、この高減衰積層体1は、高減衰積層体用ゴム組成物3と硬質板2との間に接着層を設けて構成してもよく、また、接着層を設けずに直接加硫して構成してもよい。
同様に、この高減衰積層体1は、硬質板2および高減衰積層体用ゴム組成物3と内層ゴム層4aとの間、ならびに、内層ゴム層4aと外層ゴム層4bとの間に接着層を設けて構成してもよく、また、接着層を設けずに直接加硫して構成してもよい。
As shown in FIG. 1 as an example, the high-damping laminate 1 of the present invention is obtained by alternately laminating the rubber composition 3 for the high-damping laminate and the hard plate 2 described above, and the inner-layer rubber composition described above on the outer peripheral side surface. And the outer rubber layer 4b composed of the outer rubber composition described above.
Further, the high attenuation laminate 1 may be configured by providing an adhesive layer between the rubber composition 3 for the high attenuation laminate and the hard plate 2, or directly vulcanized without providing the adhesive layer. May be configured.
Similarly, the high damping laminate 1 includes an adhesive layer between the hard plate 2 and the rubber composition 3 for the high damping laminate and the inner rubber layer 4a and between the inner rubber layer 4a and the outer rubber layer 4b. May be provided, or may be directly vulcanized without providing an adhesive layer.
図1においては、本発明の高減衰積層体1は、高減衰積層体用ゴム組成物3と、硬質板2とを交互に積層させた状態が図示されているが、高減衰積層体用ゴム組成物3は2層以上を積層させた構造としてもよい。
また、図1においては、高減衰積層体用ゴム組成物3について7層、硬質板2について6層の合計13層の例を示してあるが、本発明の高減衰積層体1の高減衰積層体用ゴム組成物3と硬質板2との積層数はこれに限定されず、用いられる用途、要求される特性等に応じて、任意に設定できる。
更に、本発明の高減衰構造体1の大きさ、全体の厚さ、本発明の高減衰積層体用ゴム組成物3の層の厚さ、硬質板の厚さ等についても、用いられる用途、要求される特性等に応じて、任意に設定できる。
In FIG. 1, the high-attenuation laminate 1 of the present invention is shown in a state in which a rubber composition 3 for a high-attenuation laminate and a hard plate 2 are alternately laminated. The composition 3 may have a structure in which two or more layers are laminated.
In addition, FIG. 1 shows an example of a total of 13 layers of 7 layers for the rubber composition 3 for the high attenuation laminate and 6 layers for the hard plate 2, but the high attenuation laminate of the high attenuation laminate 1 of the present invention. The number of layers of the body rubber composition 3 and the hard plate 2 is not limited to this, and can be arbitrarily set according to the intended use, required characteristics, and the like.
Furthermore, the size of the high attenuation structure 1 of the present invention, the overall thickness, the layer thickness of the rubber composition 3 for the high attenuation laminate of the present invention, the thickness of the hard plate, etc. It can be set arbitrarily according to the required characteristics.
本発明の積層体を製造するには、上述した高減衰積層体用ゴム組成物をシート状に成形した後に加硫して、シート状のゴム組成物を得た後、接着剤を含む層を設けて硬質板と交互に積層させてもよいし、また、あらかじめ未加硫の本発明の高減衰積層体用ゴム組成物をシート状に成形し、硬質板と交互に積層した後、加熱して加硫・接着を同時に行ってもよい。
また、被覆ゴムについても同様、高減衰積層体用ゴム組成物と硬質板とを積層した後に、上下面をフランジ等により固定し、その外周側面に上述した内層ゴム組成物および外層ゴム組成物をシート状に成形したものをこの順に巻き付けて、加硫する等の方法で設けることができる。
In order to produce the laminate of the present invention, the rubber composition for a high attenuation laminate described above is molded into a sheet and then vulcanized to obtain a sheet-like rubber composition, and then a layer containing an adhesive is formed. It may be provided and laminated alternately with the hard plate, or the rubber composition for the highly damped laminate of the present invention that has not been vulcanized in advance is formed into a sheet shape and laminated alternately with the hard plate and then heated. The vulcanization and adhesion may be performed simultaneously.
Similarly, for the coated rubber, after laminating the rubber composition for the high attenuation laminate and the hard plate, the upper and lower surfaces are fixed with a flange or the like, and the inner layer rubber composition and the outer layer rubber composition described above are attached to the outer peripheral side surface. It can be provided by a method of winding a sheet-shaped product in this order and vulcanizing.
高減衰積層体は、振動エネルギーの吸収装置として用いられればその用途、適用条件等は、特に限定されない。中でも、上述の優れた特性を有するため、建築用の振動エネルギーの吸収装置として用いられるのが好ましく、例えば、各種の免震、除振、防振等の振動エネルギーの吸収装置(より具体的には、例えば、道路橋の支承や、橋梁、ビルの基礎免震、戸建免震用途)に好適に用いられる。 The use, application conditions, and the like of the high attenuation laminate are not particularly limited as long as the high attenuation laminate is used as a vibration energy absorber. Among these, since it has the above-described excellent characteristics, it is preferably used as a vibration energy absorption device for buildings. For example, various vibration energy absorption devices for vibration isolation, vibration isolation, vibration isolation, etc. Is suitably used for, for example, support of road bridges, bridges, building base isolation, and detached base isolation applications).
以下、本発明を実施例に従ってより具体的に説明するが、本発明は下記の実施例に限定されるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated more concretely according to an Example, this invention is not limited to the following Example.
(高減衰積層体用ゴム組成物の調製)
下記第1表に示す組成(単位は質量部)になるように、各化合物を配合してB型バンバリーミキサーにて5分間混練し、未加硫の高減衰積層体用ゴム組成物を調製した。
次に、調製した未加硫の高減衰積層体用ゴム組成物を圧延し、幅900mm×長さ900mm×厚さ5mmのシート状物を作製した。
(Preparation of rubber composition for highly attenuated laminate)
Each compound was blended so as to have the composition shown in Table 1 below (unit: parts by mass) and kneaded for 5 minutes with a B-type Banbury mixer to prepare a rubber composition for an unvulcanized high-attenuation laminate. .
Next, the prepared unvulcanized rubber composition for a high attenuation laminate was rolled to produce a sheet-like material having a width of 900 mm, a length of 900 mm, and a thickness of 5 mm.
第1表中の各成分は、以下のものを使用した。
・天然ゴム:STR20、TECK BEE HANG社製
・ブタジエンゴム:NipolBR1220、日本ゼオン社製
・カーボンブラック:ダイヤブラックI、三菱化学社製
・石油樹脂:ハイレジン#120(軟化点120℃、東邦化学社製)
・ソフトクレー:ユニオンクレーRC−1、竹原化学工業社製
・シリカ:ニップシールVN3、東ソー・シリカ社製
・アロマオイル:共石プロセスX−140、共同石油社製
・硫黄:粉末イオウ、細井化学工業社製
・加硫促進剤:ノクセラーCZ、大内新興化学工業社製
The following were used for each component in Table 1.
・ Natural rubber: STR20, manufactured by TECK BEE HANG ・ Butadiene rubber: Nipol BR1220, manufactured by Nippon Zeon ・ Carbon black: Diamond Black I, manufactured by Mitsubishi Chemical Corporation )
・ Soft clay: Union Clay RC-1, manufactured by Takehara Chemical Co., Ltd. ・ Silica: Nip seal VN3, manufactured by Tosoh Silica Co., Ltd. ・ Aroma oil: Kyoishi Process X-140, manufactured by Kyodo Oil Co., Ltd.・ Vulcanization accelerator: Noxeller CZ, Ouchi Shinsei Chemical Co., Ltd.
(未加硫の外層ゴム組成物および内層ゴム組成物の調製)
下記第2表に示す組成(単位は質量部)になるように、各化合物を配合してB型バンバリーミキサーにて5分間混練し、未加硫の外層ゴム組成物および内層ゴム組成物をそれぞれ調製した。
次に、調製した未加硫の外層ゴム組成物および内層ゴム組成物を圧延し、実施例および比較例に応じて以下に示すサイズのシート状物を作製した。
なお、加硫後の外層ゴム組成物および内層ゴム組成物の破断伸びおよび硬度は、第2表に示す通りである。
(Preparation of unvulcanized outer layer rubber composition and inner layer rubber composition)
Each compound was blended so as to have the composition shown in Table 2 below (unit: parts by mass) and kneaded in a B-type Banbury mixer for 5 minutes, and the unvulcanized outer layer rubber composition and inner layer rubber composition were respectively obtained. Prepared.
Next, the prepared unvulcanized outer layer rubber composition and inner layer rubber composition were rolled, and sheet-like materials having the sizes shown below were produced according to Examples and Comparative Examples.
The rupture elongation and hardness of the vulcanized outer layer rubber composition and inner layer rubber composition are as shown in Table 2.
(実施例1)
圧延後の各ゴム組成物を用いて高減衰積層体を作製した。
具体的には、圧延後の高減衰積層体用ゴム組成物の上記シート状物を7枚積層してなるゴム層(幅900mm×長さ900mm×厚さ35mm)の3層と鉄板(幅900mm×長さ900mm×厚さ4.5mm)の2層とをそれぞれ交互に積層し、更に、これらの積層物の上下にそれぞれ鉄板(幅900mm×長さ900mm×厚さ32mm)を1枚積層させた積層体(幅900mm×長さ900mm×厚さ178mm)を作製した。
次いで、作製した積層体の外周側面に、圧延後の内層ゴム組成物(幅178mm×厚さ5mm)および外層ゴム組成物(幅178mm×厚さ5mm)をこの順にそれぞれ1周分巻きつけた。
その後、135℃で600分間プレス加硫し、高減衰積層体を作製した。なお、作製した高減衰積層体の内層ゴム層の厚みと外層ゴム層の厚みとの比は、1:1であった。
Example 1
A high-damping laminate was produced using each rubber composition after rolling.
Specifically, three layers of a rubber layer (width 900 mm × length 900 mm × thickness 35 mm) formed by laminating seven sheets of the rubber composition for a high attenuation laminate after rolling and an iron plate (width 900 mm) × 2 layers of length 900 mm × thickness 4.5 mm) are alternately laminated, and one iron plate (width 900 mm × length 900 mm × thickness 32 mm) is laminated on the top and bottom of these laminates. A laminated body (width 900 mm × length 900 mm × thickness 178 mm) was produced.
Next, the rolled inner layer rubber composition (width 178 mm × thickness 5 mm) and outer layer rubber composition (width 178 mm × thickness 5 mm) were each wound in this order on the outer peripheral side surface of the produced laminate.
Thereafter, press vulcanization was carried out at 135 ° C. for 600 minutes to produce a highly attenuated laminate. Note that the ratio of the thickness of the inner rubber layer to the thickness of the outer rubber layer of the produced high-damping laminate was 1: 1.
(実施例2)
圧延後の内層ゴム組成物(幅178mm×厚さ3mm)および外層ゴム組成物(幅178mm×厚さ7mm)を使用した以外は、実施例1と同様の方法で高減衰積層体を作製した。なお、作製した高減衰積層体の内層ゴム層の厚みと外層ゴム層の厚みとの比は、3:7であった。
(Example 2)
A highly attenuated laminate was produced in the same manner as in Example 1 except that the rolled inner layer rubber composition (width 178 mm × thickness 3 mm) and outer layer rubber composition (width 178 mm × thickness 7 mm) were used. The ratio of the thickness of the inner rubber layer and the thickness of the outer rubber layer of the produced highly-damped laminate was 3: 7.
(実施例3)
圧延後の内層ゴム組成物(幅178mm×厚さ7mm)および外層ゴム組成物(幅178mm×厚さ3mm)を使用した以外は、実施例1と同様の方法で高減衰積層体を作製した。なお、作製した高減衰積層体の内層ゴム層の厚みと外層ゴム層の厚みとの比は、7:3であった。
(Example 3)
A highly attenuated laminate was produced in the same manner as in Example 1 except that the rolled inner layer rubber composition (width 178 mm × thickness 7 mm) and outer layer rubber composition (width 178 mm × thickness 3 mm) were used. Note that the ratio of the thickness of the inner rubber layer to the thickness of the outer rubber layer of the produced high-damping laminate was 7: 3.
(比較例1)
内層ゴム組成物を用いず、外周側面に、外層ゴム組成物(幅178mm×厚さ5mm)を2周分巻きつけた以外は、実施例1と同様にして高減衰積層体を作製した。
(Comparative Example 1)
A high-attenuation laminate was produced in the same manner as in Example 1, except that the inner layer rubber composition was not used and the outer layer rubber composition (width 178 mm × thickness 5 mm) was wound around the outer peripheral side surface by two rounds.
(比較例2)
外層ゴム組成物を用いず、外周側面に、内層ゴム組成物(幅178mm×厚さ5mm)を2周分巻きつけた以外は、実施例1と同様にして高減衰積層体を作製した。
(Comparative Example 2)
A high-attenuation laminate was produced in the same manner as in Example 1 except that the outer-layer rubber composition was not used and the inner-layer rubber composition (width 178 mm × thickness 5 mm) was wound twice on the outer peripheral side surface.
(比較例3)
下記第2表に示す組成の内層ゴム組成物を用いた以外は、比較例2と同様にして高減衰積層体を作製した。
(Comparative Example 3)
A highly attenuated laminate was produced in the same manner as in Comparative Example 2 except that the inner rubber composition having the composition shown in Table 2 below was used.
作製した各高減衰積層体について、以下に示す方法により加振後の外観の評価をした。その結果を第2表に示す。 About each produced high attenuation | damping laminated body, the external appearance after vibration was evaluated by the method shown below. The results are shown in Table 2.
<外観>
作製した各高減衰積層体に、死荷重に相当する鉛直荷重(4200kN)をかけた状態で、2軸せん断試験機を用いて変形周波数0.005Hz、測定温度23℃で、175%歪みを11回加えた。
その後、歪みおよび鉛直荷重を解除し、被覆ゴムの表面を目視により確認し、表面が滑らかなものを加振後の外観により優れるものとして「○」と評価し、表面に筋状のしわが僅かに確認できるものを加振後の外観に優れるものとして「△」と評価し、表面に筋状のしわを有するものを加振後の外観に劣るものとして「×」と評価した。
なお、実施例1、比較例1および比較例3の加振後の被覆ゴムの外観を示す写真を、それぞれ、図2〜4に示す。
<Appearance>
In the state where a vertical load (4200 kN) corresponding to the dead load was applied to each of the produced high attenuation laminates, a deformation frequency of 0.005 Hz and a measurement temperature of 23 ° C. were used, and a 175% strain of 11 was applied. Added twice.
After that, the strain and vertical load are released, the surface of the coated rubber is visually confirmed, and a smooth surface is evaluated as “Excellent” by the appearance after vibration. Those that can be confirmed were evaluated as “Δ” as being excellent in appearance after vibration, and those having streaky wrinkles on the surface were evaluated as “x” as being inferior in appearance after vibration.
In addition, the photograph which shows the external appearance of the coated rubber | gum after vibration of Example 1, the comparative example 1, and the comparative example 3 is shown to FIGS.
第2表中の各成分のうち、第1表中の各成分と異なるものは、以下のものを使用した。
・酸化亜鉛:亜鉛華3号、正同化学社製
・ステアリン酸:LUNAC YA、花王社製
・老化防止剤:6C、精工化学社製
・ワックス:Sunnoc、大内新興化学社製
・スコーチ防止剤:リターダーCTP、大内新興化学社製
Among the components in Table 2, the following components were used as those different from the components in Table 1.
・ Zinc oxide: Zinc Hana 3 manufactured by Shodo Chemical Co., Ltd. ・ Stearic acid: LUNAC YA, manufactured by Kao Corporation ・ Anti-aging agent: 6C, manufactured by Seiko Chemical Co., Ltd. ・ Wax: Sunnoc, manufactured by Ouchi Shinsei Chemical Co., Ltd. ・ Scorch inhibitor : Retarder CTP, manufactured by Ouchi Shinsei Chemical
第2表から明らかなように、外周側面に形成する被覆ゴムを内層ゴム層および外層ゴム層の2層構造とし、これらの層を形成するゴム組成物(加硫物)の破断伸び、硬度および硬度差を特定の値にすることにより、加振後の外観にも優れる高減衰積層体が得られることが分かった。 As is apparent from Table 2, the coating rubber formed on the outer peripheral side surface has a two-layer structure of an inner rubber layer and an outer rubber layer, and the elongation at break, hardness, and hardness of the rubber composition (vulcanized product) forming these layers It was found that by setting the hardness difference to a specific value, a highly attenuated laminate having excellent appearance after vibration can be obtained.
1 高減衰積層体(免震積層体)
2 硬質板
3 高減衰積層体用ゴム組成物
4 被覆ゴム
4a 内層ゴム層
4b 外層ゴム層
1 High attenuation laminate (Seismic isolation laminate)
2 Hard plate 3 Rubber composition for high damping laminate 4 Cover rubber 4a Inner rubber layer 4b Outer rubber layer
Claims (4)
前記被覆ゴムが、内層ゴム層および外層ゴム層の2層構造からなり、
前記内層ゴム層が、破断伸びが700%以上で硬度が65以下のゴム組成物から形成され、
前記外層ゴム層が、破断伸びが600%以上で硬度が75以上のゴム組成物から形成され、
前記内層ゴム層を形成する前記ゴム組成物と、前記外層ゴム層を形成する前記ゴム組成物との硬度の差が15以上である高減衰積層体。 A rubber composition for a high attenuation laminate and a hard plate are alternately laminated, and a high attenuation laminate having a coating rubber on the outer peripheral side surface,
The covering rubber has a two-layer structure of an inner rubber layer and an outer rubber layer,
The inner rubber layer is formed from a rubber composition having an elongation at break of 700% or more and a hardness of 65 or less;
The outer rubber layer is formed from a rubber composition having an elongation at break of 600% or more and a hardness of 75 or more,
A highly attenuated laminate in which a difference in hardness between the rubber composition forming the inner rubber layer and the rubber composition forming the outer rubber layer is 15 or more.
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JP5278194B2 (en) * | 2009-06-25 | 2013-09-04 | 横浜ゴム株式会社 | Manufacturing method of laminated rubber bearing |
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JPH0729395B2 (en) * | 1985-10-09 | 1995-04-05 | 株式会社ブリヂストン | Seismic isolation structure |
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JPH07114388A (en) * | 1993-10-20 | 1995-05-02 | Tokai Rubber Ind Ltd | Rubber vibration insulator |
JPH1177889A (en) * | 1997-09-04 | 1999-03-23 | Yokohama Rubber Co Ltd:The | Laminated rubber support |
JP2003139194A (en) * | 2001-10-31 | 2003-05-14 | Nitta Ind Corp | Rubber support |
JP2003148557A (en) * | 2001-11-13 | 2003-05-21 | Bando Chem Ind Ltd | Base-isolation device |
JP2003166590A (en) * | 2001-11-30 | 2003-06-13 | Bridgestone Corp | Vibration restraining unit |
JP2005282723A (en) * | 2004-03-30 | 2005-10-13 | Bando Chem Ind Ltd | Base isolation bearing structure |
JP3957307B2 (en) * | 2004-09-13 | 2007-08-15 | 東洋ゴム工業株式会社 | Stabilizer bush |
JP4260100B2 (en) * | 2004-11-18 | 2009-04-30 | 横浜ゴム株式会社 | High damping laminate rubber composition |
JP3973041B2 (en) * | 2005-02-14 | 2007-09-05 | 東洋ゴム工業株式会社 | Stabilizer bush |
JP2007126649A (en) * | 2005-10-05 | 2007-05-24 | Ube Ind Ltd | Vibration-proof rubber composition |
JP2007245416A (en) * | 2006-03-14 | 2007-09-27 | Tokai Rubber Ind Ltd | Damping rubber member and its manufacturing method |
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