JPS62221532A - Multilayer body for manufacturing composite vibration damping material and method for manufacturing composite vibration damping material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a multilayer body for producing a composite vibration damping material, and in particular to a multilayer body for manufacturing a composite vibration damping material. A multi-layer body used to create a composite vibration damping material with high vibration absorption ability that can reduce the imaging of objects and reduce noise, and the composite vibration damping material using this material. Relating to a method of manufacturing the material.

[Prior art] In recent years, with the development of transportation systems and the proximity of residences to factories, noise and vibration problems have become a social problem as pollution. There is a trend towards regulating noise and vibration. In response to such trends, it is required to provide vibration damping performance to metal materials that are sources of noise and vibration, and to improve the vibration damping performance.

Therefore, a composite vibration damping material having a three-layer structure in which a resin layer made of a viscoelastic resin is sandwiched between two metal layers has been proposed as one material that exhibits such vibration damping performance. For example, it has been studied and adopted for use in automobile oil panjar engine power bars, potper chute parts, stoppers for conveyor equipment, home appliances, other metal processing machines' imaging reduction parts, and precision machinery structural parts where vibration prevention is desired. ing.

By the way, the damping performance of such a composite vibration damping material generally depends on the performance of its resin layer, and this damping performance is calculated by the loss coefficient (the amount of vibration energy from the outside converted into thermal energy due to internal friction). It is known that, when expressed in terms of mechanical hysteresis loss due to imaging, it usually shows a peak characteristic at a certain temperature, and the best vibration damping performance is exhibited near this peak characteristic temperature. .

The viscoelastic resin constituting the resin layer of such a composite vibration damping material is polyamide (Japanese Patent Application Laid-Open No. 56-159.
160), ethylene-vinyl acetate copolymer (JP-A-57-34,949), polyvinyl butyral or a blend of polyvinyl butyral and polyvinyl acetate mixed with a plasticizer and a tackifier ( Tokuko Showa 5
5-27,975), copolymer of isocyanate prepolymer and monomer (Japanese Patent Publication No. 52-26.5)
No. 54), olefin resin multilayer body (Japanese Patent Application Laid-open No. 1983-
No. 82.349 t11) and the like are known.

In addition, methods for manufacturing a composite vibration damping material by combining a viscoelastic resin and a metal material include a method in which a paint-like product in which a viscoelastic resin is dissolved in a solvent is applied to a metal material and bonded together; Examples include a method of forming a resin layer of a viscoelastic resin on a metal material using a T-die extruder, etc., a method of sandwiching a film-like viscoelastic resin produced off-line as a resin layer between metal materials and hot-melt bonding. It will be done. Each of these methods has its advantages and disadvantages, but in consideration of the workability of compounding, the working environment, the stability of product quality, etc., it is preferable to use a film-like viscoelastic resin.

By the way, regarding the film formation of viscoelastic resin, for example, composite type 1IIIJ is used near automobile engines where vibration damping performance is required in the high temperature region around 100°C.
In the case of viscoelastic resin for W1 material (high temperature vibration damping material), the glass transition temperature of this viscoelastic resin is usually above room temperature, and it is relatively easy to form into a film, but it exhibits vibration damping performance at room temperature. In the case of viscoelastic resins for composite vibration damping materials (damping materials for room temperature) that are required to Composite type i using that film
However, the workability of the LJ-based gold material was also poor.

[Problems to be Solved by the Invention] The present invention has been devised in view of this point of view, and can be formed in advance as a film, sheet, etc., and used as a resin layer of a composite vibration damping material. The present invention provides a multilayer body that not only provides excellent damping performance but also has good adhesion to metal materials and is suitable for manufacturing composite damping materials. It is an object of the present invention to provide a method for manufacturing a composite vibration damping material, which facilitates the manufacturing of vibration damping materials, especially vibration damping materials for room temperature use, and has excellent workability.

[Means for Solving the Problems] That is, the present invention provides a film-like resin layer made of a viscoelastic resin having vibration allocation performance, and on at least one side of the resin layer, the resin layer is non-adhesive to the viscoelastic resin. This is a multilayer body for manufacturing composite vibration damping materials, which is provided with a thin film-like peeling layer that is removed during the manufacturing of composite vibration damping materials, and also has an allocation performance between a pair of metal layers. When producing a viscoelastic damping I material by sandwiching a viscoelastic resin, a thin film-like resin layer is formed as the viscoelastic resin and is non-adhesive to the viscoelastic resin on at least one side of the film-like resin layer. A multilayer body provided with a release layer is used, and if necessary, one viscoelastic resin surface of the resin layer of this multilayer body is exposed, and after this exposed viscoelastic resin surface is brought into contact with the first metal layer, the above-mentioned process is carried out. Peeling 11! The resin layer is pressure-bonded to the first metal layer through the layer, and then only the release layer is removed to transfer the resin layer to the first metal layer,
This is a method for manufacturing a composite vibration damping material in which a second gold i layer is brought into contact with and pressure-bonded to the other newly exposed viscoelastic resin surface, and a pair of metal layers are bonded to each other via the resin layer.

In the present invention, the composite vibration damping material has a so-called three-layer structure in which a resin layer for bonding these metal layers to each other is sandwiched between two metal layers. The metal forming the metal layer mentioned here is not particularly limited, but usually iron, aluminum, copper,
Lead or alloys containing these as components, metal materials plated with zinc, tin, chromium, etc., surfaces treated with epoxy resins, melamine resins, etc., and chemical conversion treatments such as chromate treatment. It may be something like that.

The multilayer body used in manufacturing the above composite vibration damping material is made of viscoelastic resin and is formed into a thin film shape such as a film or sheet, and is sandwiched between the two metal layers to improve vibration damping performance. a resin layer that exhibits the
It is composed of a thin film-like release layer that is non-adhesive to the viscoelastic resin and is removed during the production of the composite vibration damping material, and is formed into a thin film-like film or sheet having at least a two-layer structure. Ru.

The viscoelastic resin constituting the resin layer is usually -80
Materials with a glass transition temperature of ~120°C are preferred, especially composite vibration damping materials for room temperature use! ! Regarding the viscoelastic resin that constitutes the resin layer used when making
Preferably it has a glass transition temperature of 0°C. When the glass transition temperature is lower than 180°C, the glass transition temperature is lower than 130°C, which is usually required for a viscoelastic composition for producing a composite vibration damping material.
In order to shift the glass transition temperature from 0 to 100℃, it is necessary to add a large amount of high melting point solid resin, filler, etc., and if it becomes higher than 120℃, the glass transition temperature will shift to the lower temperature side. In order to achieve this, it is necessary to add a large amount of plasticizer, and if these various additives are used in large quantities, the adhesiveness may decrease or the adhesive may become more likely to flow at high temperatures. Also, the loss tangent (t
andδ) is 0.5 or more from the viewpoint of vibration damping performance,
Preferably, it needs to be 0.7 or more. If this loss tangent (tan δ) is smaller than 0.5, it is satisfied and 1!7
6. Vibration damping performance is not exhibited.

Viscoelastic resin binding C that satisfies these conditions includes polystyrene, AS resin, ABS61 resin, MS resin, styrene resins such as raindrop-resistant polystyrene, polymethyl acrylate, polymethyl methacrylate, and polyethyl methacrylate-1. , acrylic resins such as acrylic copolymers, polyvinyl chloride, vinyl chloride/vinyl acetate copolymers, vinyl chloride resins such as vinyl chloride/acrylic ester copolymers, polyvinyl acetate, polyvinyl formal, polyvinyl butyral Vinyl acetate resins such as ethylene, α-
Olefin copolymer, ethylene/vinyl acetate copolymer,
Propylene such as ethylene/acrylic acid copolymer, ethylene/methacrylic acid ester copolymer, metal crosslinked ethylene/methacrylic acid copolymer, ethylene resin for shade, propylene/ethylene copolymer, propylene/butene copolymer, etc. system resin, amorphous polyamide such as copolymerized nylon,
Examples include various thermoplastic resins such as amorphous polyester. In addition, elastomers such as styrene/butadiene rubber, natural rubber, butadiene rubber, chloroprene rubber, bubour rubber, nitrile rubber, acrylic rubber, ethylene/acrylic rubber, EPI)M, epoxy resins,
Thermosetting resins such as phenolic resins and unsaturated polyester resins can also be used. These resins can be used alone or in combination of two or more, and two or more viscoelastic resins may be laminated. Among these viscoelastic resins, preferred ones for producing composite vibration damping materials for room temperature are:
Acrylic copolymers with a glass transition temperature of -60 to 80°C, vinyl chloride resins with high comonomer components, olefin resins, vinyl acetate resins, amorphous polyamides,
Examples include amorphous polyester and various elastomers.

In addition, since these viscoelastic resins are subject to secondary processing such as pressing when composite vibration damping materials are used, it is important to note that these viscoelastic resins must have adhesive properties to the metal layer, or may have undergone modification treatment to improve adhesive properties. It is preferable that the

Examples of the above-mentioned modification treatment for improving adhesiveness include a method of modifying to improve adhesiveness from the polymerization stage, and a method of modifying by graft polymerization or the like. Examples of viscoelastic resins obtained by the former method include:
Copolymerized nylon resins, linear copolymerized saturated polyester resins, metal crosslinked products of ethylene/methacrylic acid copolymers, resins made by copolymerizing vinyl heptamine with maleic acid, fumaric acid, acrylic acid, methacrylic acid, etc. etc. can be mentioned. In addition, as a viscoelastic resin obtained by the latter method, for example, an ethylene/vinyl acetate copolymer is subjected to a hydrolysis reaction and a graft reaction to immobilize water AIM in its molecules.
, multi-component copolymers with polar groups such as acetoxy groups and carboxyl groups, and unsaturated carboxylic acids and/or unsaturated acids such as maleic acid, maleic anhydride, fumaric acid, and acrylic acid based on various viscoelastic resins. Examples include those obtained by graft polymerization of carboxylic acid anhydrides, those obtained by grafting silane compounds having a vinyl group such as vinyltriethoxysilane and γ-methacryoxypropyltrimethoxysilane, and others such as tackifying resins and elastomers. Polymer blend type modified products, etc., which are blends of

Further, in order to impart spot weldability to the composite vibration damping material produced using the multilayer body of the present invention, a 1Hfi solid substance can be blended with the viscoelastic resin.

Conductive solid substances used for this purpose include metals such as iron, stainless steel, aluminum, copper, brass, and nickel that have been processed into powder, flake, fiber, and wile shapes, and copper plating. Examples include treated glass flakes and fibers, metal-plated materials such as nickel-plated glass flakes, and conductive carbonaceous materials such as carbon black, graphite, and carbon fiber. These conductive solid substances can be used alone or in combination of two or more. These conductive solid substances are preferably metal substances, particularly metal powders, in order to exhibit good conductivity with metal materials when producing the composite damping material.

If this metal substance is in powder form, its maximum particle size is
In addition, if the maximum thickness is taken as the representative length (]-) in the case of a flake-like shape, and the maximum diameter is taken as the maximum diameter in the case of a fiber-like or Y-V-like shape, better conductivity can be obtained. In order to express this, this representative length L)
19T) of the resin layer after being bonded between the metal material and the metal material
The ratio (L/T) is preferably 0.5 or more, preferably 0.8 or more, and more preferably 1.0 or more.

Note that, if necessary, various fillers other than the above-mentioned conductive solid substance can also be blended into the viscoelastic resin.

In addition, the glass transition temperature of each of the above viscoelastic resins corresponds to the peak characteristic temperature of the damping steel plate, and it is also possible to add a plasticizer to shift this peak characteristic temperature to a desired position. It is. Plasticizers used for this purpose include, for example, polyester plasticizers, polyether ester plasticizers, phosphoric acid esters, epoxy plasticizers, ester plasticizers such as phthalic acid diester and sebacic acid diester, and triester plasticizers. Examples include mellitic acid plasticizers and chlorinated paraffin plasticizers, which are appropriately selected and used depending on the viscoelastic resin used.

On the contrary, for viscoelastic resins with low glass transition temperatures,
It is also possible to avoid shifting the peak 1.17 temperature to the high temperature side by adding a substance such as a solid resin whose melting point is higher than the glass transition temperature. Examples include gylphenol resin, terpenephenol resin, rosin, rosin ester, hydrogenated rosin ester, coumaron/indene resin, phenol-modified coumaron resin, petroleum resin, etc., taking into consideration the compatibility with the viscoelastic resin used. Select and use as appropriate.

In general, various additives such as antioxidants and processing aids can also be used in the viscoelastic resin as required.

Further, a crosslinking agent may be added so that the viscoelastic resin becomes a resin layer of the composite vibration damping material and does not easily flow out even when exposed to high temperatures such as in a baking painting line. The crosslinking agent used for this purpose is appropriately selected depending on the functional group of the viscoelastic resin constituting the resin layer.
For example, sulfur, sulfur compounds, alkylphenols,
Formaldehyde resins, resin vulcanizing agents for heat-reactive phenolic resin layers, polyamines, polyols, organic peroxides, amino resins, isocyanates, polyamide amines, acid anhydrides, etc. It can also be used in combination with a crosslinking accelerator, activator, crosslinking retarder, etc.

Further, a thin film-like peeling layer that is provided on at least one side of the resin layer made of the viscoelastic resin, is non-adhesive to the viscoelastic resin, and is removed during production of the composite damping material, The material 7 is appropriately selected depending on the type of viscoelastic resin or the processing conditions when forming the resin layer and this release layer into multiple layers. This release layer is made of, for example, polyolefins such as polyethylene and polypropylene, and fluorine-based resins such as polytetrafluoroethylene and tetrafluoroethylene-hexafluoropropylene copolymer resins, etc., which are formed into a film or sheet. Examples of such materials include a thin film-like material obtained by coating the surface of paper with polyethylene or the like, glass cloth impregnated with a fluorine-based resin, and release paper. These thin film materials are used on at least one side of the resin layer, and when used on both sides, both sides may be of the same type or of different types.

The method of forming a multilayer body by providing a peeling layer made of the above-mentioned thin film-like material on at least one side of the resin layer made of this viscoelastic resin is not particularly limited;
For example, a method of applying a paint-like viscoelastic resin dissolved or dispersed in a solvent on the release layer and then drying and removing the solvent to form a resin layer; A method of forming a resin layer by applying an elastic resin, a method of forming a resin layer of viscoelastic resin on the release layer by T-die extrusion, a method of forming the release 1111t layer by a coextrusion method or a multilayer inflation method. Examples include a method of simultaneously molding a release layer from a viscoelastic resin and a resin layer from a viscoelastic resin to form a multilayer structure.

In the multilayer body of the present invention, the thicknesses of the resin layer and the release layer are appropriately determined based on the required strength of the multilayer body and the vibration damping ability of the composite vibration damping material manufactured using this multilayer body. However, the thickness of the resin layer is 10 μm or more, preferably 20 μm or more from the viewpoint of vibration damping performance, and the thickness of the peeled H1 layer is 10 μTrLg, Above, preferably 20 μm or more.

Next, in order to manufacture a composite vibration damping material using the multilayer body of the present invention, if a release layer is provided on only one side of the resin layer, the exposed viscoelastic resin surface of the resin layer is In addition, if release layers are provided on both sides of the resin layer, one of the release layers is peeled off in advance to expose the viscoelastic resin surface, and this exposed viscoelastic resin surface is applied to the first layer. After contacting the metal layer, the first gold film is applied to the resin layer through a release layer that covers the remaining viscoelastic resin surface of the resin layer.
ffl, then remove only the above peeling layer, transfer the resin layer to the first metal layer, bring the second gold layer A into contact with the newly exposed other viscoelastic resin surface, and press-bond. However, this can be carried out by adhering a pair of gold (1iiW!I) to each other via the resin layer. Note that gold Ii! constitutes the first and second metal layers! When using metal plates as forest materials, the manufacturing method of the composite vibration damping material using the multilayer body of the present invention may be a batch method using cut plates or a continuous method using coils. It may be a law.

In addition, in the method for producing a composite vibration damping material using the multilayer body of the present invention, the temperature conditions and resin layer when press-bonding the resin layer of the multilayer body to the first metal layer via the release layer of the multilayer body The temperature conditions for peeling off the release layer are preferably higher than the glass transition temperature of the viscoelastic resin constituting this resin layer and lower than the temperature at which the melt viscosity thereof is 3.000 poise. If pressure bonding is performed below the glass transition temperature of the viscoelastic resin, the adhesion of the resin layer made of the viscoelastic resin to the first metal layer will be insufficient, making it difficult to transfer the resin layer to the first metal layer. It may happen. In addition, pressure bonding and peeling at temperatures higher than the temperature at which the melt viscosity of the viscoelastic resin becomes 3.000 voids and 1!1f
When flil is peeled off, a part of the viscoelastic resin forming the resin layer is peeled off! It may remain on the llt layer, or phenomena such as threading may occur between the first metal layer and the release layer, making the work poor. Therefore, in order to facilitate the transition of the resin layer made of viscoelastic resin from the release layer to the metal layer No. 10, it is necessary to preheat the metal material constituting the first gold 1i111 to the above temperature range in advance. It is preferable to keep it. The melt viscosity referred to herein refers to the melt viscosity of the composition when the tetraelectric solid Y1, various fillers, various additives, etc. are blended into the viscoelastic resin.

Further, the resin layer of the viscoelastic resin constituting the multilayer body is attached to the first gold l1 via a non-adhesive peeling layer to the viscoelastic resin.
Regarding the means for crimping the ri layer, press crimping,
Although any means such as roll pressure bonding may be employed, roll pressure bonding is preferably employed in order to uniformly pressure bond the resin layer and the first gold H layer.

The pressure when performing this roll crimping is selected appropriately depending on the temperature conditions at the time of crimping, but if the temperature conditions at the time of crimping are relatively low, near the glass transition temperature of the viscoelastic resin. is preferably a relatively high pressure in order to improve the adhesion with the first metal layer, and also the viscoelastic resin of the resin layer. Fy melt viscosity is 3,00
When the pressure is relatively high, such as about 0 poise, it is preferable to use a low pressure in order to keep the flow of this viscoelastic resin to the necessary minimum, and generally it is related to the temperature conditions during crimping. It is desirable that it is not more than 30 to 9f/a+.

According to the above manufacturing method, the resin layer is pressure-bonded to the first metal layer through the release layer, and then the release layer is peeled off to transfer the resin layer of the viscoelastic resin to the first gold layer. The crimping time from crimping to peeling is appropriately determined depending on the temperature and pressure conditions at the time of crimping. In addition, when performing roll crimping, if O-roll crimping is performed with one roll, the release layer will be peeled off immediately after crimping, but even if the crimping time is as short as this, the temperature at the time of crimping will change. Depending on the pressure conditions, the resin layer can be sufficiently transferred. In addition, when performing this process using multiple rolls, the temperature and pressure conditions can be selected and set for each roll to make it easier to transfer the resin layer made of viscoelastic resin to the first metal layer. It can also be done.

Furthermore, after the resin layer of the viscoelastic resin was transferred to the first metal layer in this way, the 14It layer was peeled off from the resin layer and a second metal layer was applied to the newly exposed surface of the other viscoelastic resin. The pair of gold B layers are bonded by contact and pressure bonding through the resin layer, but the pressure bonding conditions such as temperature, pressure, pressure bonding means, etc. Although the conditions may be the same as those described above, it is preferable to raise the temperature slightly in order to improve the adhesion between the second metal layer and the resin layer.

In this way, after sandwiching and pressing the resin layer between the pair of metal layers, the product is cooled in a cooling process such as a cooling press or a cooling roll, as necessary, to produce a composite vibration damping material. .

Effect 1 In the multilayer body of the present invention, the viscoelastic resin is supported as a resin layer by a release layer of a non-adhesive thin film material, so even viscoelastic resins that cannot be formed into a film or sheet by themselves can be formed into a film. This makes it possible to form the viscoelastic resin into sheets, significantly improves the handling properties of this viscoelastic resin, improves workability during the production of composite vibration damping materials, and improves the stability of the product quantity 11. Further, according to the method for manufacturing a composite damping material using the multilayer body described above, the viscoelastic resin is supported by a release layer of a non-adhesive thin film material until it is transferred onto the first metal layer. Therefore, even viscoelastic resins that originally lack film strength can be used, and the resin layer of the manufactured composite vibration damping material can contain only resins that have the function of imparting vibration damping performance. This makes it possible to exhibit excellent vibration damping performance even if this resin layer is thinned to the extent that it does not adversely affect press working.

EXAMPLES] Hereinafter, the present invention will be specifically described according to Examples, the accompanying drawings, and Comparative Examples.

Example 1 Ethylene acrylic rubber 10 with a glass transition temperature of -28°C and a loss tangent (tan δ) of 1.0 at this glass transition temperature
0 mm part, clay 105, 'n FXi part, 75 parts of Kumaron resin, and 4°4°-bis(α,α'-dimethylbenzyl) Schiff 422 heavy ω part as an antioxidant. A viscoelastic resin was prepared by kneading.

Next, a 30 mm xylene solution of this viscoelastic resin was applied onto a release paper and dried in a drying oven at 110°C to produce a multilayered body in which a 70 μm thick viscoelastic resin layer was provided on the release paper. did.

Example 2 Using the multilayer body (1) manufactured in Example 1 above, a chromate-treated cold-rolled steel plate with a thickness of 0.8M was used as the metal material constituting the pair of metal layers (4). As shown in Figure 1, the resin layer (2) of the multilayer body (1) is transferred to the metal layer (4) using a roll (5), and the release layer (3) of the multilayer body (1) made of release paper is transferred. ) was peeled off and removed. At this time, the cold-rolled steel sheet constituting the metal layer (4) is heated to 16 mm before the resin layer (2) of the multilayer body (1) is crimped onto the surface of the cold rolled steel sheet.
It was preheated to 0° C., and the pressure during pressure bonding with the roll (5) was adjusted to 2 Kg/CrR. The melt viscosity at 160°C of the viscoelastic resin made of the above composition was measured using a flow tester under the conditions of a die diameter of 0.5+s++φ, a die diameter of 11II11, and a pressure of 10% and 9r/ci. Met.

In this way, after transferring the resin layer (2) of the multilayer body (1) onto the cold-rolled steel sheet constituting the metal layer (4), the metal layer made of the same metal material as this cold-rolled steel sheet is transferred to the resin layer (4). Layer (2)
The damping steel plate was then placed on top and crimped with a roll at 200° C. with a thickness of 10 cm (1 cm), and then passed through a cooling roll to produce a vibration damping steel plate.

The thickness of the resin layer of the obtained damping steel plate was 63 μm, and as a result of measuring the damping performance using the mechanical impedance method, the maximum value of the loss coefficient (tan δ) was 0.85, which is the maximum value. The temperature at that time was 60°C. In addition, regarding adhesive strength, T peel strength (JIS K-6854) Ka11 K9r/25trm Teat T, shear adhesive strength I!
1 (-6850 to JIS) is 130 K9 facts
Met.

Example 3 Amorphous polyester with a glass transition temperature of -11° C. and a loss tangent (tan δ) of 0.95 and a glass transition temperature of 4° C. and a loss tangent (tan δ) of 1.0 at this glass transition temperature. A 1:1 mixture with amorphous polyester was used as the viscoelastic resin, and release 1111 was applied onto paper under melting conditions of 90 °C, so that a resin layer of viscoelastic resin with a thickness of 80 μm was provided on the release paper. A multilayer body was produced.

Example 4 A vibration-damping steel plate was manufactured in the same manner as in Example 2 using the multilayer body obtained in Example 3. At this time, the preheating temperature of the cold-rolled steel plate constituting the metal layer was 100 ℃, and the pressure angle during roll pressure bonding was set to 5.9 f/CIR.The melt viscosity of the viscoelastic resin used in Example 3 at 100° C. was 8×10 4 poise.

The thickness of the resin layer of the obtained damping steel plate was 75 μm, and the damping performance was such that the maximum loss coefficient (tan δ) was 0.9, and the temperature at which this maximum value was reached was 50°C. Met. Regarding adhesive strength, T-peel strength is 1589
It's f/25m! yl breaking adhesive strength is 155 kg
It was recta.

Example 5 Resin composition 1 used as the viscoelastic resin in Example 3 above
A multilayer body was produced in the same manner as in Example 3 by adding 50 small portions of stainless steel powder (SUS410) classified to 200 meshes (74 μm) or less to 00 weight M parts to obtain a viscoelastic resin.

Example 6 Using the multilayer body obtained in Example 5 above, Example 4
A damping steel plate was manufactured under the same conditions. The melt viscosity of the viscoelastic resin used in Example 5 at 100° C. was 1×10 5 poise or more.

The damping performance of the obtained damping steel plate has a maximum loss coefficient of 0.85, and the temperature at which this maximum value is shown is 55.
It was ℃. In addition, the adhesive strength was 13 Kgr/25 Jl, and the shear adhesive strength was 140 to 9 f/aA.

Note that the thickness of the resin layer of this damping steel plate was 65 μm, and spot welding was possible under the conditions of a pressurizing force of 250, 9 f/ai, a current ff16, and a energization time of 10 cycles.

Comparative Example 1 The multilayer body obtained in Example 5 was used, and as the metal material constituting the pair of metal layers, a 0.8-foot thick film treated with chrome-1 to chrome-1 in the same manner as in the above examples was used. Using a cold-rolled steel plate, after peeling off the release paper from the resin layer of the viscoelastic resin, this resin layer was sandwiched between a pair of cold-rolled steel plates preheated to 100°C, and rolled under the condition of 5/(yf/α). I did the crimp.

The resin layer of viscoelastic resin has poor film strength, and problems such as stretching and cutting of the film occur between the position where the release paper is peeled off from the resin layer and the position where it is sandwiched between a pair of cold rolled steel plates. It was not possible to manufacture stable vibration damping steel plates.

[Effect of the invention 1] According to the multilayer body of the present invention and the method for producing a composite vibration damping material using the same, even a viscoelastic resin that cannot be made into a film or a sheet by itself can be made into a film or sheet. This makes it possible to significantly improve the handling of this viscoelastic resin, improve workability during the production of composite vibration damping materials, and improve stability of product quality.

[Brief explanation of drawings]

FIG. 1 is an explanatory view, without showing the state of crimping, when a composite molded material is produced using the multilayer body of the present invention. DESCRIPTION OF SYMBOLS 1...Multilayer body, 2...Resin layer, 3...Peeling layer, 4
...metal layer, 5...roll Patent applicant Nippon Steel Chemical Co., Ltd. Same as above
Nippon Steel Corporation stock 0 company representative Patent attorney Katsuo Naruse (2 others) Procedures Neyama iFe; (Voluntary) June 1986-L7 15 Hsu Fj Secretary U? ! 1 Dobe-dono 1, Incident A' (Display of 1986! 1.'j Revised 1st August 2, 6467, Title of Invention Multi-vi body for manufacturing composite vibration damping material and manufacture of composite vibration damping material Method 3, Relationship with the person making the amendment I/1 Address of the applicant: 5-13-16 Ginza, Chuo-ku, Tokyo Name (6
6=1) New F1 Tetsukagaku Co., Ltd. (1 other person) 4. Agent 105 Phone: 03 (433) 4,12
0 Address: 3 T' fl 8-8g, 5th floor, 6th floor, Hill, 3 Shinbashi, Minato-ku, Tokyo, "Detailed description of the invention" column 7 of the specification to be amended, page 26, line 13 of the statement of contents of the amendment [Kyf/cm described in [ ]
Correct J as l'Ngf/cnij. that's all

Claims (10)

[Claims] (1) A thin film that is non-adhesive to the viscoelastic resin and is removed during production of the composite vibration damping material on at least one side of a resin layer formed in the form of a thin film of a viscoelastic resin having vibration damping performance. A multilayer body for manufacturing a composite vibration damping material, characterized by having a peeling layer of a shape. (2) The viscoelastic resin has a glass transition temperature of -80 to 120°C and a loss tangent of 0.5 or more at this glass transition temperature (
A multilayer body for producing a composite vibration damping material according to claim 1, having a tan δ). (3) For manufacturing a composite vibration damping material according to claim 1 or 2, wherein the viscoelastic resin has adhesiveness to a metal material or is modified to improve adhesiveness. multilayer body. (4) The multilayer body for producing a composite vibration damping material according to any one of claims 1 to 3, wherein the viscoelastic resin contains a conductive solid substance. (5) A viscoelastic multilayer body for producing a composite vibration damping material according to claim 4, wherein the conductive solid substance is a metal powder. (6) When producing a viscoelastic damping material by sandwiching a viscoelastic resin having damping performance between a pair of metal layers, the viscoelastic resin is formed into a thin film-like resin layer and at least one side of the viscoelastic resin has a A multi-layered body provided with a thin film-like peeling layer that is non-adhesive to elastic resin is used, and if necessary, one viscoelastic resin surface of the resin layer of this multi-layered body is exposed, and the exposed viscoelastic resin is After bringing the surface into contact with the first metal layer, the resin layer is pressure-bonded to the metal layer via the release layer, and then only the release layer is removed to transfer the resin layer to the first metal layer,
A method for producing a composite vibration damping material, comprising: bringing a second metal layer into contact with the other newly exposed viscoelastic resin surface and press-bonding the pair, and bonding the pair of metal layers to each other via the resin layer. . (7) The viscoelastic resin has a glass transition temperature of -80 to 120°C and a loss tangent of 0.5 or more at this glass transition temperature (
tan δ). (8) The temperature conditions when press-bonding the resin layer to the metal layer and the temperature conditions when peeling the release layer from the resin layer are equal to or higher than the glass transition temperature of the viscoelastic resin constituting this resin layer, and its melt viscosity is 8. The method for producing a composite vibration damping material according to claim 6 or 7, wherein the temperature is at most 3,000 poise. (9) The method for producing a composite vibration damping material according to any one of claims 6 to 8, wherein the resin layer is pressed onto the metal layer by roll compression. (10) The pressure condition during roll crimping is 30 kg. f/c
The method for producing a composite vibration damping material according to claim 9, wherein the vibration damping material is less than or equal to m.