JPH08258207A - Laminated structure - Google Patents

Abstract

PURPOSE: To increase a spring constant in the laminating direction, that is, the longitudinal direction and to impart flexibility in the lateral direction by laminating a plurality of hard panels with specific bending modulus or more and a plurality of soft panels constituted of a polymeric compsn. containing a monomeric material and a polymeric material specified in the difference between the solubility parameter values of them 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 constituted of a polymeric compsn. consisting of a monomeric material and an org. polymeric material being a thermoplastic elastomer. The viscosity of the monomeric material is set to 5×10<5> centipose or less at 100 deg.C. The polymeric compsn. is characterized by that the difference between the solubility parameter values of the monomeric material and the org. polymeric material is set to 3.0 or less and the wt. ratio of them is set to 1.0 or more. Each of the hard plates 14 is constituted of metal, ceramic, plastic, wood, a paper board, a slate plate or a decorative plate of which the bending modulus at 25 deg.C is 100kgf/mm<2> or more. The polymeric compsn. constituting the soft panels 12 is characterized by that loss tangent at 25 deg.C and 5Hz is 0.05-1.0 and shearing modulus at 25 deg.C is 0.0005-0.01kgf/mm<2> .

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 Extremely lightweight objects such as precision machines and O
For vibration isolation of equipment A, various motors, research equipment, etc., it is common to use a vibration isolation 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 object is to obtain a laminated structure having excellent vibration damping performance, which is suitable for a vibration-proof structure of an extremely lightweight article.

[0006]

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

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 contains a low molecular weight material and an organic high molecular weight material, and 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 organic high molecular weight material. The difference in the solubility parameter value of each is 3.0 or less,
And a polymer composition in which the weight ratio of the low molecular weight material and the organic polymer material is 1.0 or more, and (2) the rigid plate has a flexural modulus of 100 kgf / mm ^{2 at} 25 ° C.
It is characterized by being composed of the above materials.

The polymer composition constituting the soft plate of the laminated structure of the present invention is formed into an anti-vibration laminated structure of the present invention by forming a large amount of low molecular weight material in an organic polymer material. A suitable low elastic modulus and loss characteristics can be easily imparted to the material, and the bleeding property, which has been a drawback of the conventional low elastic modulus by the addition of oil, 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 in the polymer composition constituting the soft plate of the laminated structure of the present invention has a viscosity of 5 × 10 ^{5 at} 100 ° C.
Centipoise or less, preferably 1 × 10 ⁵ from the viewpoint of effect
It is a material of centipoise or less. 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 selected optimally in consideration of the required properties of the laminated structure, the vibration damping application, and the compatibility with the organic polymer material which is another component used in the polymer composition. And is used in the optimum amount.

The organic polymer material used in the present invention is a material having a function of effectively holding a low molecular weight material, and is an important component for achieving the object of the present invention. Specifically, in order to enable a uniform composition containing a large amount of low molecular weight materials, a large amount of low molecular weight materials and organic high molecular weight materials are used to obtain a polymer composition holding a large amount of low molecular weight materials. Is used as a soft plate. Here, "holding" the low molecular weight material means that the low molecular weight material is uniformly dispersed in the organic polymer 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.

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

The organic polymer material has a number average molecular weight of 2
50,000 or more, especially 30,000 or more, especially 4
50,000 or more thermoplastic polymer organic materials are preferred,
For example, styrene type (butadiene styrene type, isoprene styrene type, etc.), vinyl chloride type, olefin type (butadiene type, isoprene type, ethylene propylene type, etc.),
Various thermoplastic elastomers such as ester-based, amide-based, urethane-based, hydrogenated products thereof, and modified products thereof, styrene-based, ABS-based, olefin-based (ethylene-based, propylene-based, ethylene-propylene-based, ethylene-styrene-based) , Propylene styrene type, etc.), acrylate type (methyl acrylate type), methacrylic acid 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, vinyl butyral type , Alkylene oxide type (pro Thermoplastic resins alkylene oxide-based, etc.) and the like, and the like rubber-modified products of these resins. 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.

The low molecular weight material and the organic polymer material in the present invention are partially described in JP-A-5-239256 and JP-A-5-194763. As the organic polymer material, those described as a medium material having a three-dimensional continuous network skeleton structure disclosed in this publication are also suitably used as typical ones in the present invention. Examples thereof include hydrogenated products, butadiene-styrene copolymer hydrogenated products, and ethylene-propylene copolymers. Among them, butadiene polymer hydrogenated products and butadiene-styrene copolymer hydrogenated products are more preferred. .

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 8
0%, and from the viewpoint of effect, it is preferably 10 to 70%.
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. 2-2. 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, preferably 5 from the viewpoint of the effect.
× 10 ⁴ or more. 2-3. The crystalline segment (S1) composed of the ethylene block, the cohesive segment (S3) composed of the styrene block, and the amorphous segment (S2) composed of the block containing the ethylene unit and the butylene unit.
And / or a hydrogenated product having an amorphous segment (S5) composed of a block containing the ethylene unit, the butylene unit and the styrene unit. In this case, the ethylene block, the styrene block and the amorphous segment in one molecular chain may all be present as one block or as two or more multiblocks. The ratio of the amorphous segment in one molecular chain is 20 to 90%, and from the viewpoint of the effect, it is preferably 30 to 85%. Further, the number average molecular weight of this hydrogenated product is 3 × 10 ⁴ or more, preferably 5 from the viewpoint of the effect.
× 10 ⁴ or more. 3. The ethylene-propylene-based copolymer includes ethylene-propylene binary copolymer and ethylene-propylene-
Diene terpolymers are preferably included. 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%. The proportion of the crystalline segment consisting of propylene block is 5 to 60%,
From the viewpoint of effect, a copolymer and the like having a content of 7 to 50% 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 polymer composition used for the soft plate of the laminated structure of the present invention has a three-dimensional continuous network skeleton structure formed of an organic polymer material, and the skeleton has an average diameter of 50 μm or less, preferably Is 30 μm or less, the average diameter of the cell (mesh) is 500 μm or less, preferably 300 μm or less, and the volume fraction of the organic polymer material is [volume of organic polymer material /
(Volume of organic polymer material + volume of low molecular material)] × 100
When defined as (%), the volume fraction of the organic polymer material is 30
% Or less, and particularly preferably 25% or less.

The organic polymer material in the present invention is not particularly limited, but it may be a usual bulk material, granular material, gel material, foam material,
A non-woven fabric or the like can be used, but a gel-like one, particularly a gel-like one having a three-dimensional continuous uniform network skeleton structure made of a thermoplastic polymer is effective. It can also be used in a form in which a capsule containing a low molecular weight material is incorporated.

When obtaining a polymer composition containing a large amount of a low molecular weight material and an organic polymer material, the difference in solubility parameter value between the low molecular weight material and the organic polymer 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 effects. 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.

Further, the weight ratio of the low molecular weight material to the organic high molecular weight material is 1.0 or more, preferably 2.0 or more, more preferably 3.0 or more from the viewpoint of the effect. This weight ratio is 1.0
If it is less than the above range, 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 polymer composition containing a low molecular weight material and an organic polymer 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 organic polymer 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 preferable method, a method using the high shear type special mixer previously proposed by the present applicant, that is,
By kneading the thermoplastic polymer material, which is an organic polymer material, and the low molecular material with a high shear special mixer having a rotor shear rate of 5.0 × 10 ² (sec ⁻¹ ) or more, A method (Japanese Patent Application No. 5-316431) for obtaining a low molecular weight material-holding organic polymer material composite which contains a large amount of low molecular weight material uniformly and has little bleeding of the low molecular weight material. As such a high-shear type special mixer, in particular, a high shear force and a high shear rate can be applied between the fixed wall and the rotating rotor, and the distance between the fixed wall and the rotating part (rotor) ( Clearance) is defined as t (m), rotor peripheral speed is defined as v (m / sec), and rotor shear speed V is defined as V = v / t (sec ⁻¹ )
≧ 5.0 × 10 ² (sec ⁻¹ ), preferably V ≧ 1.0
× 10 ³ (sec ⁻¹ ), more preferably V ≧ 2.5 × 1
0 ³ (sec ⁻¹ ), most preferably V ≧ 5.0 × 1
A high shear type special mixer satisfying 0 ³ (sec ⁻¹ ) can be mentioned.

If necessary, various rubber chemicals such as a vulcanization accelerator, an antioxidant and an ultraviolet absorber can be used in combination with these polymer compositions. Furthermore, a tackifier for improving the bondability with a hard plate, a foaming agent for reducing the weight,
A flame retardant or the like can be used depending on the purpose.

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 copolymer 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 0.01
kgf / mm ² It should be noted that the loss tangent, shear dynamic viscoelasticity tester (manufactured by Toyo Seiki Co.) by 25 ° C., a value measured under the conditions of 5 Hz, the loss tangent as above 0.1. 0, preferably 0.2 to 1.0, and more preferably 0.3 to 1.0 from the viewpoint of effect. If the loss tangent is less than 0.1, it is difficult to obtain the desired vibration damping performance, and if the loss tangent exceeds 1.0, the temperature dependence of various physical properties such as elastic modulus becomes large, which is not preferable.

The shear modulus of elasticity is 0 when measured with a shearing type dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.) at 25 ° C.
A 0005~0.01kgf / mm ^2, preferably a 0.001~0.009kgf / mm ^2. If the shear elastic modulus is less than 0.0005 kgf / mm ² , the shape retention may be deteriorated, and there is a risk of settling and the like.
If it exceeds 1 kgf / mm ² , it becomes hard and the vibration damping effect for an extremely lightweight article deteriorates, 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.

The hard plate of the laminated structure of the present invention has a flexural modulus of 100 kgf / mm ² at a hardness of 25 ° C.
The above thin plates are preferably used and are preferably composed of metal, ceramics, plastic, fiber reinforced plastic, wood, paper plate, slate plate, and decorative plate. 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. Here, the flexural modulus is measured according to ASTM D 790.
The materials that make up the hard plate are iron, aluminum,
Metal materials such as copper, zinc and stainless steel, various ceramic materials, plastic materials such as hard urethane resin, melamine resin and styrene resin, fiber reinforced by compounding these plastic materials with reinforcing materials such as glass fiber, cabone fiber and aramid fiber Examples include plastic, but depending on the intended use of the laminated structure, wood, paper board, slate board,
A plate such as a decorative plate can be used as it is.

The laminated structure of the present invention is formed 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 constituted only by laminating the respective layers, but for the purpose of improving the affinity between the layers, the respective layers may be adhered by using 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, it is difficult to obtain desired vibration damping performance and its sustainability and stability with ordinary vibration damping materials, and it is extremely lightweight. Articles, for example, surface pressure 10-200 g / c
It is suitable for vibration damping of extremely lightweight articles of about m ² . To exemplify the application, for example, it is particularly suitable as a vibration-damping / vibration-damping / cushioning material for lightweight objects for precision instruments, office automation equipment, various motors, research equipment, etc.
Various printers, various speakers, coolers, washing machines,
It is preferably used as a device for generating vibration / sound such as a refrigerator, a fan, a vacuum cleaner, a dryer, and a blower, or a vibration preventing member for home electric appliances. Further, 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 preferably used as a vibration preventing member.

[0048]

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 the polystyrene conversion was performed using the differential refractive index (RI) with monodisperse polystyrene as a standard.

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 of elasticity is 25 ° C., using a shearing type dynamic viscoelasticity tester (manufactured by Toyo Seiki Co., Ltd.) at a temperature of 25 ° C.
It was measured at.

The viscosity and the solubility parameter of the liquid were measured by the usual methods. [Example] Using the materials shown in Table 1 below, a low molecular weight material and an organic polymer material were mixed by a high shear type mixer (TK Auto Homomixer: manufactured by Tokushu Kika Kogyo Co., Ltd.) (180 ° C, 6,000
0r. p. m. , Shear rate 2.0 × 10 ⁴ sec ^-1 , 4
0 minutes), a polymer composition was obtained. When the composition was observed with an electron microscope, it was confirmed that it had a three-dimensional continuous reticulated skeleton structure (skeleton average diameter 3 μm, cell average diameter 10 μm), and held a low molecular weight material therein. It was

[0053]

[Table 1]

The obtained polymer composition had a large tan δ value of 0.2 and a shear modulus of 0.01 kgf / m.
m ² .

Thus, the obtained polymer composition was 2.5 mm in thickness and 50 mm in diameter to prepare a soft plate.

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.

This laminated structure 10 is connected to a motor (contact pressure 10
When used as a vibration damping member of 0 g / cm ² ), the vibration of the motor was significantly reduced. Therefore, it was confirmed that the laminated structure 10 of the present example has extremely excellent vibration damping properties. In addition, as described above, the laminated structure 10 of the present embodiment.
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.

[0059]

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 is suitable for a vibration-proof structure for an extremely lightweight article and has an effect of 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 (5)

[Claims] 1. A laminated structure in which a plurality of hard plates and a soft plate are laminated, wherein: (1) the soft plate contains a low molecular weight material and an organic high molecular weight material, and the low molecular weight material is It has a viscosity of 5 × 10 ⁵ centipoise or less at 100 ° C., the difference in solubility parameter value between the low molecular weight material and the organic polymer material is 3.0 or less, and the low molecular weight material and the organic high molecular weight material have a difference of 3.0 or less. The weight ratio of the molecular material is 1.0 or more, and is composed of a polymer composition. (2) The rigid plate has a flexural modulus of 10 at 25 ° C.
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 of 0.0005 to 0.01 kgf / mm ² at 25 ° C. 3. The laminated structure according to claim 1, wherein the organic polymer 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 hard plate is made of metal, ceramics, plastic, fiber reinforced plastic, wood, paper plate, slate plate, or decorative plate.
The laminated structure described.