JPH08258206A - Laminated structure - Google Patents

Abstract

PURPOSE: To increase a spring constant in the longitudinal direction and to impart flexibility in the lateral direction by laminating a plurality of hard panels and a plurality of soft panels specified in the difference between the respective solubility parameter values of a monomeric material and a medium material as well as the monomeric material and a polymeric material and the wt. ratio of them. CONSTITUTION: A laminated structure 10 is obtained by laminating a plurality of hard panels 14 and a plurality of soft panels 12. Each of the soft panels 12 is obtained from a polymeric compsn. wherein a polymeric material is combined with a monomeric material holding composite obtained by using a monomeric material and a medium material to hold the monomeric material. The monomeric material has viscosity of 5×10<5> centipoise or less at 100 deg.C and the difference between the solubility parameter values of the monomeric material and the medium material is set to 0.3 or less and the wt. ratio of the monomeric material and the medium material is set to 1.0 or less. The difference between the solubility parameter values of the monomeric material and the polymeric material is set to 4.0 or less and the wt. ratio of them is set to 0.5 or more. The hard panels 14 are constituted of a material having bending modulus of 100kgf/mm<2> or more at 25 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated structure, more specifically, it has a low elastic modulus, a high loss characteristic, excellent productivity, economical efficiency and versatility, and a large amount of a low molecular weight material. The present invention relates to a laminated structure that uses the retained polymer composition as a soft plate and is suitable for a vibration-proof structure for a lightweight material.

[0002]

2. Description of the Related Art Light articles such as precision machinery, office automation equipment,
For vibration damping of various motors and research equipment, it is common to use a vibration damping structure made of a flexible material.
That is, in order to damp the transmission of vibration to the lightweight object, it is necessary to soften the elastic body such as a spring and a rubber plate as a vibration isolation material, and a gel-like substance is usually used.

However, although this gel-like substance has a shape-retaining property, it is flexible also in a direction other than the direction which originally requires vibration isolation, usually the horizontal direction, so that the initial deformation under load, It is difficult to obtain a vibration-damping material having a good vibration-damping effect and its durability because it has drawbacks such as the occurrence of problems such as fatigue and creep during use.

[0004]

In recent years, with the increasing functionality of various devices, further improvements in vibration damping performance have been demanded for vibration damping structures mounted on these devices.

As is clear from the above description,
The object of the present invention is to use a polymer composition having a very low elastic modulus, a high loss property in a desired direction, and excellent properties, productivity, economy and versatility as a soft plate. The purpose of the present invention is to obtain a laminated structure having excellent vibration damping performance, which is suitable for a vibration-proof structure for a lightweight material.

[0006]

In order to solve these problems, the present inventors previously used a polymer composition having a low elastic modulus, for example, a polymer composition having a very low elastic modulus. Completed the damping material and filed a patent application. The present invention further improves on this, by forming a soft plate using this low elastic modulus polymer composition, by forming a laminate with a hard plate, in the laminating direction, that is, the longitudinal direction, the spring constant Is large,
It was found that a vibration damping structure that is flexible in the lateral direction can be obtained, and the present invention has been completed.

That is, the laminated structure of the present invention is a laminated structure formed by laminating a plurality of hard plates and soft plates,
(1) The soft plate is a polymer composition containing a low molecular weight material-holding medium composite (A) containing a low molecular weight material and a medium material, and the high molecular weight material (B). Has a viscosity of 5 × 10 ⁵ centipoise or less at 100 ° C., and the difference in solubility parameter value between the low molecular weight material and the medium material is 3.0.
The weight ratio of the low molecular weight material to the medium material is 1.0 or more, the difference in solubility parameter value between the low molecular weight material and the polymer material is 4.0 or less, and A material composed of a polymer composition in which the weight ratio of the low molecular weight material to the high molecular weight material is 0.3 or more, and (2) the hard plate has a bending elastic modulus at 25 ° C. of 100 kgf / mm ² or more. It is characterized by being constituted by.

The polymer composition constituting the soft plate of the laminated structure of the present invention is formed by adding a low molecular weight material-holding medium material composite holding a large amount of low molecular weight material to a general polymer material and molding it. The low elastic modulus and loss characteristics suitable for the vibration-damping laminated structure of the present invention can be easily imparted to the polymer material, and the bleeding property, which has been a drawback of the low elastic modulus due to the addition of conventional oil, can also be obtained. Can be improved. Therefore, the laminated structure of the present invention is excellent in vibration damping property, and the structure is stable and the effect is long-lasting.

The present invention will be described in detail below. The low molecular weight material used for the polymer material constituting the soft plate of the laminated structure of the present invention has a viscosity at 100 ° C. of 5 × 10 ⁵ centipoise or less, and from the viewpoint of effect, preferably 1 × 10 ⁵ centipoise or less. Is. From the viewpoint of the molecular weight, the number average molecular weight of the low molecular weight material is 20,000 or less, preferably 10,000 or less, and more preferably 5,000 or less from the viewpoint of the effect. Usually, a liquid or liquid material at room temperature is preferably used. Further, both hydrophilic and hydrophobic low molecular weight materials can be used.

As the low molecular weight material, any material can be used as long as it satisfies the above-mentioned conditions, and the following materials can be cited as examples, although not particularly limited thereto.

Softening agent: A softening agent for various rubbers or resins such as mineral oils, vegetable oils and synthetic oils. Examples of the mineral oil-based oil include process oils such as aromatic oils, naphthene oils, and paraffin oils. As vegetable oils, castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil,
Examples include coconut oil, peanut oil, wood wax, pine oil, olive oil and the like. Examples of the synthetic oil type include aromatic type.

Plasticizer: Various ester type plasticizers such as phthalic acid ester, phthalic acid mixed group ester, aliphatic dibasic acid ester, glycol ester, fatty acid ester, phosphoric acid ester, stearic acid ester, epoxy type plasticizer, etc. Plasticizer for plastics or phthalate type,
Adipate-based, sebacate-based, phosphate-based, polyether-based, polyester-based, etc. plasticizers for NBR.

Tackifier: Various tackifiers (tackifier) such as coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, rosin derivative and the like.

Oligomer: Crown ether, fluorine-containing oligomer, polyisobutylene, xylene resin, chlorinated rubber, polyethylene wax, petroleum resin, rosin ester rubber, polyalkylene glycol diacrylate,
Liquid rubber (polybutadiene, styrene-butadiene rubber, butadiene-acrylonitrile rubber, polychloroprene, etc.), silicone-based oligomers, various oligomers such as poly-α-olefins.

Lubricants: Hydrocarbon lubricants such as paraffin and wax, fatty acid lubricants such as higher fatty acids and oxyfatty acids, fatty acid amide lubricants such as fatty acid amides and alkylenebisfatty acid amides, fatty acid lower alcohol esters, fatty acid polyhydric alcohol esters. , Ester-based lubricants such as fatty acid polyglycol esters, alcohol-based lubricants such as aliphatic alcohols, polyhydric alcohols, polyglycols and polyglycerols, various lubricants such as metal soaps and mixed lubricants.

In addition, latex, emulsion, liquid crystal, bituminous composition, clay, inorganic silicone oil, phosphazene and the like are also suitable as the low molecular weight material. Further, animal oil such as cow oil, pig oil, horse oil, bird oil or fish oil: hydrocarbon type, halogenated hydrocarbon type, alcohol type, phenol type, ether type, acetal type, ketone type, fatty acid type,
Ester-based, nitrogen compound-based, sulfur compound-based organic solvents: petroleum, water, and aqueous solutions are suitable. These components may be used alone or in combination of two or more.

The low molecular weight material is optimal in consideration of the required properties of the laminated structure, vibration damping applications, compatibility with other materials used in the polymer composition, such as the medium material and the polymer material. Is selected and used in the optimum amount.

The medium material used in the present invention is a material having a function as a medium of a low molecular weight material and a high molecular weight material,
It is an important component for achieving the object of the present invention. Specifically, in order to enable a uniform composition of a large amount of low molecular weight material and a high molecular weight material, a high molecular weight low molecular weight material and a medium material are used. First, a product is obtained, and a polymer composition in which a desired amount of a low molecular weight material is retained is obtained by combining this with a polymer material. Even if the low molecular weight material, the medium material, and the high molecular weight material are mixed at the same time, a uniform polymer composition having a low elastic modulus cannot be obtained. Moreover, even if a large amount of low molecular weight material and a high molecular weight material are directly mixed to obtain a high molecular weight material containing a large amount of low molecular weight material, the low molecular weight material cannot be mixed uniformly and bleeding is often easy. However, the intended polymer composition having a low elastic modulus cannot be obtained.
Here, "holding" the low molecular weight material means that the low molecular weight material is uniformly dispersed in the medium material and the high molecular weight material, and does not bleed, or bleeding is suppressed. Of course, the degree of bleeding can be easily controlled depending on the purpose of the polymer composition.
Finally, when the low molecular weight material-holding medium composite is mixed with the polymeric material, the uniform mechanism of uniform dispersion in the material is not always clear, but many of the composites are divided into fine particles. It is considered to be retained in the polymer material.

As the medium material of the present invention, any material can be used as long as it has a function as described above and can form a composite that holds a large amount of low molecular weight materials, but is usually a thermoplastic polymer material. Alternatively, various materials having the polymer material as a constituent element are used.

The medium material has a number average molecular weight of 20,0.
00 or more, especially 30,000 or more, especially 40,000
Zero or more thermoplastic polymer organic materials are preferred, for example,
Various thermoplastic elastomers such as styrene type (butadiene styrene type, isoprene styrene type), vinyl chloride type, olefin type (butadiene type, isoprene type, ethylene propylene type), ester type, amide type, urethane type, etc. Hydrogenated products, other modified products, styrene-based, ABS-based, olefin-based (ethylene-based, propylene-based, ethylene-propylene-based, ethylene-styrene-based, propylene-styrene-based, etc.), acrylic ester-based (methyl acrylate-based, etc.) , Methacrylic acid ester type (methyl methacrylate type), carbonate type, acetal type, nylon type, halogenated polyether type (chlorinated polyether type, etc.), halogenated olefin type (vinyl chloride type, tetrafluoroethylene type, fluorine type) -Ethylene chloride type, Fluorinated ethylene Propylene type), cellulose type (acetyl cellulose type, ethyl cellulose type, etc.), vinylidene type, vinyl butyral type, alkylene oxide type (propylene oxide type, etc.) thermoplastic resins, and rubber modified products of these resins. To be Among them, thermoplastic elastomers are preferably used from the viewpoint of effects.

Among these, it is preferable that a portion where a hard block such as a crystal structure or an agglomerated structure is easily formed and a soft block such as an amorphous structure are mixed together.

A part of the low molecular weight material, the medium material and the low molecular weight material-holding medium material composite according to the present invention is disclosed in JP-A-5-23.
9256 and Japanese Patent Laid-Open No. 5-194763. As the medium material, a material having a three-dimensional continuous network skeleton structure disclosed in this publication is also suitably used as a typical one in the present invention. For example, a hydrogenated product of a butadiene polymer or a butadiene-styrene copolymer is used. Examples thereof include hydrogenated products of polymers and ethylene-propylene copolymers. Among them, hydrogenated products of butadiene polymers and hydrogenated products of butadiene-styrene copolymers are more preferable.

1. The hydrogenated product of the butadiene polymer preferably has a hydrogenation rate of 90% or more. This hydrogenated product can have various molecular structures depending on the composition of 1,4 bonds and 1,2 bonds of the butadiene polymer as a starting polymer and the composition distribution thereof. Due to this molecular structure, the hydrogenated product can include segments of various crystal characteristics such as crystallinity, amorphousness, and characteristics having both crystallinity and amorphousness in one molecular chain.

Specifically, the crystalline segment of this hydrogenated product is (1) a crystalline segment (S1), (2) which is based on the hydrogenation of 1,4-bonded butadiene units and consists of ethylene blocks mainly containing ethylene units. ) Amorphous segment (S based on the hydrogenation of 1,4-bonded butadiene units and 1,2-bonded butadiene units) which is mainly composed of blocks each containing an ethylene unit and a butylene unit.
2) etc. can be mentioned.

The hydrogenated product of the butadiene polymer in the present invention preferably has a segment having crystal characteristics having both crystallinity and amorphousness.

Among them, those having both the crystalline segment (S1) composed of the ethylene block and the amorphous segment (S2) composed of the block containing the ethylene unit and the butylene unit are preferable. In this case, even if the ethylene block in one molecular chain is one block,
Alternatively, it may exist as two or more multi-blocks.
Further, the ratio of the ethylene block in one molecular chain is 5 to
It is 80%, and from the viewpoint of effect, it is preferably 10 to 70%. Furthermore, the number average molecular weight of this hydrogenated product is 3 × 10.
⁴ or more, preferably 5 × 10 ⁴ or more in terms of effects. 2. The hydrogenated product of the butadiene-styrene copolymer preferably has a hydrogenation ratio of 90% or more. This hydrogenated product can have various molecular structures depending on the composition of 1,4 bonds, 1,2 bonds and styrene part of the butadiene part of the starting copolymer and its composition distribution. Due to this molecular structure, the hydrogenated product has crystallinity, cohesiveness, amorphousness, characteristics having both crystallinity and amorphousness, characteristics having cohesiveness and amorphousness, and crystallinity and cohesiveness in one molecular chain. It is possible to include a segment having various crystal characteristics such as a characteristic having both an amorphous property and an amorphous property.

Specifically, the crystalline characteristic segment of this hydrogenated product is (1) a crystalline segment (S1), (2) consisting of an ethylene block mainly containing ethylene units, which is based on the hydrogenation of 1,4-bonded butadiene units. ) Amorphous segment (S based on the hydrogenation of 1,4-bonded butadiene units and 1,2-bonded butadiene units) which is mainly composed of blocks each containing an ethylene unit and a butylene unit.
2), (3) Cohesive segment (S3) mainly composed of styrene block (S3), (4) 1,2
An amorphous segment (S4) consisting of blocks mainly containing butylene units and styrene units, respectively, based on hydrogenation of bound butadiene units and styrene units,
(5) An amorphous segment (S5) composed of blocks mainly containing ethylene units, butylene units, and styrene units based on hydrogenation of 1,4-bond butadiene units, 1,2-bond butadiene units, and styrene units, etc. You can

The hydrogenated product of the butadiene-styrene copolymer in the present invention has the characteristics of having both crystallinity and amorphousness, the characteristics of having both cohesiveness and amorphousness, and the combination of crystallinity, cohesiveness and amorphousness. It is preferable to have a segment of crystalline properties such as those that have.

Of these, the following hydrogenated substances are preferably used. 2-1. A hydrogenated product having both a crystalline segment (S1) composed of the ethylene block and an amorphous segment (S5) composed of a block containing the ethylene unit, butylene unit and styrene unit. In this case, the ethylene block in one molecular chain may exist as one block or as two or more multiblocks. Further, the ratio of the ethylene block in one molecular chain is 5 to 80%, and from the viewpoint of effect, it is preferably 10 to 70%.
%. Furthermore, the number average molecular weight of this hydrogenated product is 3
× 10 ⁴ or more, from the viewpoint of the effect, is preferably 5 × 10 ⁴ or more. 2-2. A hydrogenated product having both a cohesive segment (S3) composed of the styrene block and an amorphous segment (S2) composed of a block containing the ethylene unit and a butylene unit. In this case, it is preferable that the styrene block in one molecular chain exists as two or more multiblocks. The ratio of the styrene block in one molecular chain is 5 to 60%, and from the viewpoint of effect, it is preferably 10 to 50%. Further, the number average molecular weight of this hydrogenated product is 3 × 10 ⁴ or more, and from the viewpoint of effect, it is preferably 5 × 10 ⁴ or more. 2-3. Crystalline segment consisting of the ethylene block (S1) and cohesive segment consisting of the styrene block (S3)
And a hydrogenated product having an amorphous segment (S2) composed of a block containing the ethylene unit and a butylene unit and / or an amorphous segment (S5) composed of a block containing the ethylene unit, a butylene unit and a styrene unit. In this case, the ethylene block, the styrene block, and the amorphous segment in one molecular chain are all one block, or 2
It may exist as one or more multi-blocks. Also,
The ratio of the amorphous segment in one molecular chain is 2
From 0 to 90%, from the viewpoint of effect, it is preferably from 30 to 85%. Furthermore, the number average molecular weight of this hydrogenated product is 3 × 1.
0 ⁴ or more, preferably 5 × 10 ⁴ or more from the viewpoint of effects. 3. The ethylene-propylene copolymer preferably includes an ethylene-propylene binary copolymer and an ethylene-propylene-diene terpolymer. The preferred ethylene-propylene copolymer mainly contains a copolymer and a propylene unit in which the proportion of the crystalline segment consisting of the ethylene block mainly containing the ethylene unit is 5 to 60%, and from the viewpoint of the effect, 7 to 50%. Proportion of crystalline segment consisting of propylene block is 5-6
A copolymer and the like, which are 0% and 7 to 50% from the viewpoint of effects, can be mentioned.

Although various thermoplastic elastomers such as hydrogenated products of these butadiene polymers, hydrogenated products of butadiene-styrene copolymers and ethylene-propylene copolymers are mainly used alone, two or more kinds thereof are used. You may blend and use.

The medium material in the present invention is not particularly limited, but it can be used in a usual bulk form, granular form, gel form, foam form, non-woven fabric form or the like. It can also be used in a form in which a capsule containing a low molecular weight material is incorporated.

In order to obtain a low molecular weight material-holding medium material composite containing a large amount of low molecular weight material and medium material, the difference in solubility parameter value between the low molecular weight material and the medium material used is 3.
Both materials are selected so as to be 0 or less, and preferably 2.5 or less from the viewpoint of the effect. If this difference exceeds 3.0, from the viewpoint of compatibility, it is difficult to retain a large amount of the low molecular weight material, which is an obstacle to lowering the elastic modulus of the polymer composition, and bleeding of the low molecular weight material is likely to occur. Therefore, it is not preferable.

Furthermore, the weight ratio of the low molecular weight material to the medium material is 1.
0 or more, preferably 2.0 or more from the viewpoint of effect,
3.0 or more is more preferable. If this weight ratio is less than 1.0, it may be difficult to obtain a polymer composition having a very low elastic modulus, and the object of the present invention may not be achieved.

As a method for producing a low molecular weight material-holding medium material composite containing a low molecular weight material and a medium material, an optimum method including a known method is selected depending on the type, characteristics, mixing ratio, etc. of the low molecular weight material and the medium material used. It may be used and is not particularly limited. The method described in JP-A-5-239256 mentioned above is also one method.

As a particularly preferred method, a method using the high shear type special mixer previously proposed by the present applicant, that is,
By kneading the thermoplastic polymer material as the medium material and the low-molecular material with a high shear type special mixer having a rotor shear rate of 5.0 × 10 ² (sec ⁻¹ ) or more, a large amount of A method (Japanese Patent Application No. 5-316431) for obtaining a low molecular weight material-holding medium composite which contains the low molecular weight material uniformly and has little bleeding of the low molecular weight material.

The polymer material in the present invention to be blended with the low molecular weight material-holding medium composite is not particularly limited as long as it is a versatile material. That is, ordinary thermoplastic materials or thermosetting materials can be widely used.

Examples of the thermoplastic material include styrene type (butadiene styrene type, isoprene styrene type, etc.),
Vinyl chloride-based, olefin-based (butadiene-based, isoprene-based, ethylene-propylene-based, etc.), ester-based, amide-based, urethane-based, and other thermoplastic elastomers, as well as their hydrogenated products and other modified products, styrene-based, ABS type, olefin type (ethylene type, propylene type, ethylene propylene type, ethylene styrene type, propylene styrene type, etc.), acrylic acid ester type (methyl acrylate type, etc.), methacrylic acid ester type (methyl methacrylate type, etc.), Carbonate type, acetal type,
Nylon type, halogenated polyether type (chlorinated polyether type, etc.), halogenated olefin type (vinyl chloride type,
Tetrafluoroethylene type, fluorinated-ethylene chloride type, fluorinated ethylene propylene type, etc.), cellulose type (acetyl cellulose type, ethyl cellulose type, etc.), vinylidene type,
Examples thereof include vinyl butyral-based and alkylene oxide-based (propylene oxide-based, etc.) thermoplastic resins, and rubber-modified products of these resins.

On the other hand, examples of thermosetting materials, that is, materials which are thermoset in the presence or absence of a curing agent include, for example, ethylene propylene rubber (EPR), ethylene propylene diene terpolymer rubber (EPDM), nitrile. Rubber (NB
R), butyl rubber, halogenated butyl rubber, chloroprene rubber (CR), natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR), acrylic rubber, ethylene-vinyl acetate (EVA) , General rubber such as polyurethane, silicone rubber, fluorine rubber, ethylene acrylic rubber, polyester elastomer, epichlorohydrin rubber, polysulfide rubber,
Specific rubbers such as hypalon and chlorinated polyethylene, and thermosetting resins such as phenol, urea, melamine, aniline, unsaturated polyester, diallyl phthalate, epoxy alkyd, silicon resin and polyimide can be used.

As the curing material for these thermosetting materials, known materials such as sulfur, organic peroxides and nitroso compounds are widely used.

These polymeric materials may be used alone or in a blend of two or more. In addition, various vulcanization accelerators, antioxidants, and
A rubber chemical such as an ultraviolet absorber can be used together. Furthermore, a tackifier for improving the bondability with a hard plate,
A foaming agent for reducing the weight, a flame retardant and the like can be used according to the purpose.

As the polymer material, for example, ethylene propylene rubber, ethylene propylene diene terpolymer rubber, natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber and the like are preferably used from the viewpoint of effect.

In the present invention, both materials are selected so that the difference in solubility parameter value between the low molecular weight material and the high molecular weight material is 4.0 or less, and preferably 3.0 or less from the viewpoint of the effect. The low molecular weight material is mixed with the high molecular weight material in the form of a low molecular weight material holding medium composite, and the compatibility between the low molecular weight material and the high molecular weight material is also a problem in this case. If the difference in this parameter exceeds 4.0, from the viewpoint of compatibility, the low molecular weight material that is retained in a large amount in the composite is difficult to retain in the polymer material, resulting in a decrease in the elastic modulus of the polymer composition. It is not preferable because it causes trouble and bleeding of low molecular weight material is likely to occur.

Further, the weight ratio of the low molecular weight material and the high molecular weight material is 0.5 or more, preferably 0.8 or more, more preferably 1.0 or more from the viewpoint of the effect. If the weight ratio is less than 0.5, it becomes difficult to obtain a polymer composition having a very low elastic modulus, which is not preferable.

The content of the unvulcanized rubber component in the polymer material according to the present invention is preferably 3.0% by weight.

The mixing method of the low molecular weight material-holding medium composite of the present invention and the polymer material is not limited, but an optimum method including a known method may be adopted depending on the characteristics of both and the mixing ratio. Thereby, the polymer composition of the present invention can be easily obtained.

The polymer composition according to the present invention can be easily obtained by mixing the low molecular weight material-holding medium composite and the polymer material, and then vulcanizing and curing the rubber if necessary. .

If necessary, the polymer composition of the present invention may further contain the following fillers. For example, clay, diatomaceous earth, carbon black, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxides, mica, graphite, scale-like inorganic fillers such as aluminum hydroxide, various metal powders, wood chips, Glass powder, ceramic powder, granular or powder solid filler such as granular or powder polymer, other various natural or artificial short fibers, long fibers (for example, straw, hair, glass fiber, metal fiber, other various polymer fibers) Etc.) etc. can be blended.

Weight reduction can be achieved by blending hollow fillers, for example, inorganic hollow fillers such as glass balloons and silica balloons, and organic hollow fillers made of polyvinylidene fluoride, polyvinylidene fluoride copolymers and the like. . Furthermore, in order to improve various physical properties such as weight reduction, it is possible to mix various foaming agents.
It is also possible to mechanically mix the gas during mixing.

The physical properties suitable for the polymer composition used as the soft plate of the laminated structure of the present invention are as follows. The polymer composition can satisfy all these physical properties.

(A) Loss tangent (tan δ, 25 ° C., 5H
z): 0.05 to 1.0 (B) Shear elastic modulus (25 ° C.): 0.0005 to 0.03
kgf / mm ^{2 The} loss tangent is a value measured by a shear dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.) under the conditions of 25 ° C. and 5 Hz, and the loss tangent is 0.05 to 1. 0, preferably 0.07 to 1.0 from the viewpoint of the effect, and if the loss tangent is less than 0.05, it cannot be a material with the target high loss characteristics, and if the loss tangent exceeds 1.0, it becomes elastic. The temperature dependence of various physical properties such as rate becomes large, which is not preferable.

The shear modulus of elasticity was measured by a shear-type dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.) at 25 ° C.
It is 0005 to 0.03 kgf / mm ² , and preferably 0.002 to 0.03 kgf / mm ² . If the shear elastic modulus is less than 0.0005 kgf / mm ² , the shape retaining property may be deteriorated, and there is a risk of settling and the like.
If it exceeds kgf / mm ² , it becomes hard and the vibration damping effect for a lightweight object is deteriorated, which is not preferable.

The polymer composition used for the soft plate of the present invention is
Since it is possible to hold a low molecular weight material such as a large amount of liquid, it has an advantage that the elastic modulus can be controlled to an extremely low range.

As the hard plate of the laminated structure of the present invention, 2
A thin plate having a flexural modulus of 100 kgf / mm ² or more at 5 ° C is preferably used, and includes metal, ceramics, plastic, fiber reinforced plastic, wood, paper plate, slate plate,
It is preferably composed of a decorative plate. Here, the flexural modulus is measured according to ASTM D790. The thickness of the hard plate varies depending on the purpose of use of the laminated structure, but is generally preferably about 0.05 to 2 mm. The materials that make up the hard plate are iron, aluminum, copper,
Metal materials such as zinc and stainless steel, various ceramic materials, plastic materials such as hard urethane resin, melamine resin, and styrene resin, and fiber reinforced plastics that combine these plastic materials with reinforcing materials such as glass fiber, cabone fiber, and aramid fiber. However, depending on the intended use of the laminated structure, a plate such as wood, a paper plate, a slate plate, or a decorative plate can be used as it is.

The laminated structure of the present invention is constituted by laminating the soft plate and the hard plate as needed. Usually, a soft plate and a hard plate are alternately laminated, but in order to obtain a desired damping effect, only a plurality of soft plates are laminated and used by laminating it with a hard plate, or between layers, for example, It is also possible to stack and use layers composed of different materials such as a rubber plate having a normal elastic modulus.

Further, the laminated structure of the present invention can be constructed only by laminating each layer, but for the purpose of improving the affinity between the layers, each layer may be adhered with an adhesive, and the soft layer The adhesiveness between each layer may be improved by adding an adhesiveness improver.

The laminated structure of the present invention can be used in a wide variety of industrial fields. In particular, a conventional vibration damping material is a lightweight material which is difficult to obtain desired vibration damping performance and its sustainability and stability. For example, it is preferably used for damping a lightweight object having a surface pressure of about ²⁰ to 2000 g / cm ² . To exemplify the application, for example, as a vibration-proof / vibration-damping / cushioning material for lightweight objects,
It is particularly suitable for precision equipment, office automation equipment, various motors, research equipment, etc. In addition, it also vibrates and sounds various printers, various speakers, coolers, washing machines, refrigerators, fans, vacuum cleaners, dryers, blowers, etc. It is also preferably used as a device for generating vibration or a member for preventing vibration of home electric appliances. Furthermore, as shock absorbers, audio equipment, electronic / electrical equipment, beds, chairs, especially medical beds, barber / beauty beds, theater chairs, and seat materials for vehicles that are subject to vibration It is also preferably used as a vibration preventing member.

[0057]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

Various measurements were made by the following methods. The number average molecular weight was measured by gel permeation chromatography [GPC; Tohso GMH-XL (two in series)], and by using differential refractive index (RI), monodisperse polystyrene was used as a standard and converted into polystyrene.

For the measurement of tan δ, a shearing type dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.) was used, temperature 25 ° C., strain 10
% At a frequency of 5 Hz.

The shear modulus is 25 ° C., using a shear dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.), and the temperature is 25 °.
Measured at C.

The viscosity and the solubility parameter of the liquid were measured by the usual methods. [Example] With the materials shown in Table 1 below, a low-molecular material and a medium material were mixed by a high-shear mixer (TK Auto Homomixer: manufactured by Tokushu Kika Kogyo Co., Ltd.) (180 ° C, 6, 000r.
p. m. At a shear rate of 2.0 × 10 ⁴ sec ⁻¹ for 40 minutes) to obtain a low molecular weight material-holding composite. When the composite was observed with an electron microscope, it was confirmed that it had a three-dimensional continuous network skeleton structure and held a low molecular weight material therein.

[0062]

[Table 1]

Next, the obtained low molecular weight material holding composite and the polymer material shown below were mixed with a Brabender (40
C., 40 r. p. m. For 15 minutes),
It was vulcanized and cured for 20 minutes to obtain a polymer composition. The obtained polymer composition had a large tan δ value of 0.3,
The shear modulus was 0.03 kgf / mm ² .

[Polymer material: compounding amount (% by weight)]-Natural rubber: 100-Carbon black: 40-Others (vulcanization accelerator, anti-aging agent, etc.): 4.0 The cured product of the molecular composition has a thickness of 2.
A soft plate was prepared with a diameter of 5 mm and a diameter of 50 mm.

FIG. 1 is a schematic sectional view of a laminated structure 10 of this embodiment. The soft plate 12 and the hard plate 14 produced as described above are alternately laminated in 19 stages to obtain a laminated structure 10. As the hard plate 14, an aluminum plate having a thickness of 1.0 mm and a diameter of 50 mm was used.

The laminated structure 10 is connected to a motor (contact pressure 10
It was confirmed that the laminated structure 10 of the present example has an extremely excellent vibration damping property, because the vibration of the motor was extremely reduced when it was used as a vibration damping member of 00 g / cm ² ). In addition, as described above, the laminated structure 1 of this example
0 was easy to manufacture and had high productivity.

FIG. 2 is a schematic sectional view of a structure 18 in which the periphery of the laminated structure 10 of the above embodiment is covered with a rubber plate layer 16. As described above, a thin elastic layer can be formed around the laminated structure 10 in order to reduce lateral shear stress, improve shape retention, and effectively prevent settling.

[0068]

INDUSTRIAL APPLICABILITY The laminated structure of the present invention is a polymer having a very low elastic modulus, high loss characteristics in a desired direction, and excellent characteristics, productivity, economy and versatility. By using the composition as a soft plate, it has an effect that it is suitable for a vibration-proof structure for lightweight articles and has excellent vibration damping performance.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a laminated structure of an example.

FIG. 2 is a schematic cross-sectional view of a structure in which the periphery of the laminated structure is covered with a rubber plate layer.

[Explanation of symbols]

 10 laminated structure 12 soft plate 14 hard plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F16F 15/02 9138-3J F16F 15/02 Q

Claims (6)

[Claims] 1. A laminated structure comprising a plurality of hard plates and a soft plate, wherein (1) the soft plate contains a low molecular weight material and a medium material. A polymer composition comprising (A) and a polymer material (B), wherein the low molecular weight material has a viscosity of 5 × 10 ⁵ centipoise or less at 100 ° C., and the low molecular weight material and the medium material are The difference in solubility parameter value between each is 3.0 or less, the weight ratio of the low molecular weight material and the medium material is 1.0 or more, and the solubility parameter value of each of the low molecular weight material and the polymer material is A polymer composition having a difference of 4.0 or less and a weight ratio of the low molecular weight material and the high molecular weight material of 0.5 or more; (2) the hard plate at 25 ° C. Flexural modulus 10
A laminated structure comprising a material of 0 kgf / mm ² or more. 2. The polymer composition constituting the soft plate,
The loss tangent (tan δ) at 25 ° C. and 5 Hz is 0.
The laminated structure according to claim 1, wherein the laminated structure has a characteristic of having a shear elastic modulus at 25 ° C. of 05 to 1.0 and 0.0005 to 0.03 kgf / mm ² . 3. The laminated structure according to claim 1, wherein the medium material is a thermoplastic elastomer. 4. The laminated structure according to claim 3, wherein the thermoplastic elastomer is a hydrogenated product of a butadiene polymer or a hydrogenated product of a butadiene-styrene copolymer. 5. The polymer material is at least one selected from ethylene propylene rubber, ethylene propylene diene terpolymer rubber, natural rubber, isoprene rubber, styrene butadiene rubber or butadiene rubber. The laminated structure according to claim 1. 6. The hard plate is made of metal, ceramics, plastic, fiber reinforced plastic, wood, paper plate, slate plate, or decorative plate.
The laminated structure described.