JPH0679824A - Composite type vibration-damping metal plate - Google Patents

Abstract

PURPOSE:To obtain vibration-damping metal plate, which is equipped with vibration- damping capacity, excellent after-working properties and adhesion in combination by a method wherein viscoelastic composition is laminated between two metal plates and integrated with each other through thermosetting reaction. CONSTITUTION:Hardened material of viscoelastic composition consisting of 10-200 pts.wt. of tack producing resin, which has glass transition point of 20 deg.C or lower and is liquid at normal temperature, 0.1-10 pts.wt. of crosslinking catalyst and 0.1-10 pts.wt. of silane-based surface modifier to 100 pts.wt. of denatured polybutadiene rubber, which has acryloiloxy group or methacryloiloxy group at both the terminals of polybutadiene molecular skeleton and number average molecular weight of 500-10,000 and is liquid at normal temperature, is laminated between two sheets of metal plate. Further, to give spot-weldability to the metal plate concerned, 1-100 pts.wt. of metal powder having the particle diameter of 150mum or less is added to the viscoelastic composition so as to be laminated between the two sheets of metal plate. When the metal powder is added to the composition, the thickness of intermediate material layer is made to be 0.9-0.45 times as much as the maximum particle diameter of the metal powder added to the composition so as to be thermally hardened in order to be made into an integral body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-damping metal plate which has good coatability and is excellent in vibration-damping property and post-processability. More specifically, according to the invention of the present application, a viscoelastic composition, which is easy to apply because the property of the curing agent is liquid at a temperature of 30 to 60 ° C., is laminated between two metal plates, and then a thermosetting reaction is performed. The present invention relates to an integrated composite vibration-damping metal plate that is capable of extremely excellent molding workability such as overhanging, bending, and deep drawing and spot liquid contact property. . These composite type vibration damping metal plates are used in vehicles such as automobiles, railroads and aircrafts, office equipment, audio equipment, home appliances, etc. in a temperature range of 0 to 100 ° C., in particular,
It is a composite type vibration damping metal plate having excellent vibration damping property that reduces the noise of the vibration member near room temperature.

[0002]

2. Description of the Related Art Recently, with the spread of vehicles such as automobiles, railroads, aircrafts, office equipment, audio equipment, home appliances, and building materials, noise countermeasures against those equipment and materials have become an urgent issue. -Upgraded, many vibration-damping metal plates have been proposed and put to practical use as measures against it. In particular, in order to reduce engine noise due to automobile noise regulations, a method of taking measures with an oil pan of a damping steel plate has been proposed. Even now, about 70% of the demand for the damping steel plate is for the oil pan. is the current situation. In the case of an oil pan, the temperature used is in the range of 60 to 120 ° C., and most of the viscoelastic substances that have been used with the intermediate material layer of the vibration-damping steel sheet to date are thermoplastic resins. It was

However, when the conventional vibration-damping steel plate is evaluated in response to market demands, the following deficiencies are raised and improvement is required. The first point is durability against heat. In order to improve the corrosion resistance of metals, the coating baking temperature has become a high temperature baking condition, and a damping steel sheet having a thermoplastic resin as an intermediate layer may cause peeling or deviation during coating baking. The second point is the improvement of the performance of damping steel sheets. The recent demand for damping steel sheets is equipment and materials used at room temperature, such as automobile body materials,
Alternatively, it has been used for building materials such as roofs and floors, home electric appliances and the like. As a result, in order to adapt the vibration damping performance to the room temperature range, it is necessary to make the intermediate layer material a soft viscoelastic composition with a large loss. Therefore, the damping property is good,
On the other hand, some problems have been pointed out, such as a decrease in adhesive strength with metal, resulting in difficulty in forming such as bending and drawing.

That is, the property required for the vibration-damping steel plate is to satisfy both the anti-vibration property and the adhesive property, which are in a trade-off relationship. As a measure for satisfying these conditions, a viscoelastic composition is cross-linked. This is achieved by introducing a structure. As a result, a vibration-damping steel sheet has been proposed in which a viscoelastic composition of a thermosetting resin having a crosslinked structure is used as an intermediate layer from the viscoelastic composition of a thermoplastic resin that has been conventionally used.

The inventors of the present application have also hitherto proposed a vibration-damping metal plate using various thermosetting resins as an intermediate layer material (Japanese Patent Laid-Open No. 6-58242).
0-245550, JP-A-60-255426, JP-A-63-274044). The thermosetting damping steel sheets that have been proposed so far are
Polyester-based materials, acrylic-based materials, epoxy-based materials, etc.Because the properties of these substances before curing are solid or high-viscosity materials, they are diluted with liquid agents or reactive diluents to lower the viscosity and sprayed. In the present circumstances, a method of coating a metal plate with a roll coater, a knife coater, etc., then laminating another metal plate, passing it through a heating furnace, and curing and integrating it is adopted. is there.

However, it is necessary to dry the solvent, reactive diluent, etc. contained in the intermediate substance, and there is a risk of fire, explosion, etc. in the heating and drying process for that purpose, or odor, skin irritation, etc. There are the above-mentioned problems and quality problems such as foaming and expansion of the intermediate layer caused by the residual solvent, which is a major technical issue in putting the damping steel sheet into practical use.

[0007]

OBJECT OF THE INVENTION The object of the present invention is to improve the above-mentioned drawbacks of the thermosetting type vibration-damping metal plate in the manufacturing process, and to have a vibration damping ability, and excellent post-processability and adhesiveness. It is to provide a damping metal plate. That is, as a result of intensive research conducted by the inventors of this application, an acryloyloxy group at both ends of the polybutadiene molecular skeleton,
Alternatively, the glass transition point is 20 with respect to 100 parts by weight of a modified polybutadiene resin having a methacryloyloxy group and having a number average molecular weight of 500 to 10,000 and being liquid at room temperature.
A petroleum-based tackifier that is liquid at room temperature below ℃ 10
~ 200 parts by weight, 0.1-10 parts by weight of the silane-based modifier, 0.1-10 parts by weight of the crosslinking catalyst, or a metal powder having a particle size of 150 microns or less in order to impart further spot weldability. When a viscoelastic composition consisting of 1 to 100 parts by weight is found, it is laminated between two metal plates, and when a metal powder is contained, the thickness of the intermediate material layer is the maximum particle size of the metal powder contained in the composition. On the other hand, the present invention relates to a composite type vibration-damping metal plate in which an intermediate material layer of 0.9 to 0.45 times is formed and then heat-cured to be integrated. That is, a reactive polybutadiene rubber that is liquid at room temperature and a petroleum-based tackifier that is liquid at room temperature are mainly used, and a liquid viscoelastic composition containing a cross-linking catalyst is used to ensure safe and coatability. An excellent vibration-damping steel plate can be manufactured.

[0008]

The gist of the present invention is that (A) the molecular structure is polybutadiene, and the number average molecular weight of which has an acrylyloxy group or a methacryloyloxy group at both ends thereof is 500 to 10,000 at room temperature. (B) 10 to 200 parts by weight of a petroleum-based tackifying resin having a glass transition of 20 ° C. or less and a liquid at room temperature (C) 0.1 to 100 parts by weight of a modified polybutadiene resin which is in a liquid state. 10 parts by weight (D) 0.1 to 10 parts by weight of a silane-based modifier, and (E) 1 to 100 parts by weight of a metal powder having a particle size of 150 μm or less is used between two metal plates. When laminated and contains metal powder, the thickness of the intermediate material layer is set to 0.95 of the metal powder particle size.
A composite type damping metal that has a thickness of 0.4 times and then hardens and integrates the intermediate layer to improve the workability of the vibration-damping metal plate and has excellent vibration-damping properties, post-workability, and weldability. It is about boards. A polymerization inhibitor, a curing accelerator, an antiaging agent, a filler and the like may be added to the viscoelastic composition of the invention of this application, if necessary.

The properties of the above viscoelastic composition before curing are a viscous substance having a viscosity of 700 poise or less at a material viscosity of 50 ° C. and a tackiness. As the physical properties after thermosetting, the storage elastic modulus (E ′) is 10 ⁷ to 10 ¹⁰ dyne / cm ² and the loss tangent (Tan δ) is 0.1 or more in the temperature range of 0 to 60 ° C. And, the adhesion performance with two metal plates, the peel adhesion is 3kg
f / 25mm or more, shear adhesive strength is 30kgf / cm ²
The present invention relates to a composite vibration-damping metal plate using an intermediate material of a viscoelastic composition having both the vibration-damping property and the adhesive property, which has excellent adhesiveness.

Next, each material of the viscous composition used in the present invention will be described in detail. The polybutadiene resin having an acryloyloxy group at both ends or a methacryloyloxy group used in the invention of this application has a structural formula shown below. It is a polymer having a vinyl structure of 85% or more of polybutadiene having an acryloyloxy group or a methacryloyloxy group at both ends and undergoing a curing reaction with a radical polymerization catalyst, and having a number average molecular weight of 5
It is from 0.00 to 10,000, and those which are liquid at room temperature are preferable in terms of use conditions and physical properties.

[0011]

CH ₂ = C (R) COOC ₂ H ₄ OOCHNC ₆ H ₃ (CH ₃ ) NHCOOCH ₂ CH ₂ [CH (CH = CH ₂ ) CH ₂ ] n- (R: H, CH ₃ )

As the tackifier for use in the invention of the present application, which has a glass transition point of 20 ° C. or less and is liquid at room temperature,
Rosin, rosin derivative, terpene resin, terpene phenol resin and hydrogenated natural resins, C5 and C9 series aliphatic, petroleum resin, aromatic petroleum resin, alicyclic petroleum resin, copolymerized petroleum resin, Malon indene resin, alkylphenol resin, modified phenol resin, xylene resin,
Styrene resin, polyacrylic acid ester, synthetic resin such as unsaturated polyester, or phthalic acid ester, aromatic polybasic ester, aliphatic dibasic acid ester, polybutene, polyisobutylene paraffin oil, naphthene oil, aromatic oil, etc. Softeners and the like can be used, and they can be used alone or in combination of two or more in view of use conditions, physical properties and other aspects.

Further, the crosslinking catalyst used in the present invention includes ketone peroxides such as methyl ethyl ketone peroxide, cyclohexane peroxide and acetylacetone peroxide: 1,1-bis (tertiary-
Peroxyketals such as butyl peroxide) -3,3,5-trimethylcyclohexane, 1,1-bis (tertiary-butyl peroxide) -cyclohexane: third
Hydroperoxides such as tert-butyl hydroperoxide, cumene hydroperoxide, and 2,5-dimethylhexane-2,5-dihydroperoxide: di-tertiary butyl peroxide, dialkyl peroxides such as dicumyl peroxide Oxide: Acyl peroxide such as acetyl peroxide, isobutyl peroxide and benzoyl peroxide: Peroxydicarbonate such as diisopropyl peroxydicarbonate and dimyristyl peroxydicarbonate: tertiary-butyl peroxyacetate, tertiary -Butyl peroxybenzoate, tertiary-butyl peroxy maleic acid,
Examples thereof include peroxyesters such as tertiary-butyl peroxyisopropyl carbonate, and at least one peroxide of these curing agents is used.

The silane-based surface modifier used in the present invention is vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-metallyloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane. , 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane, N-2
(Aminoethyl) 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, N-
Phenyl-3-aminopropyltrimethoxysilane, 3
-Mercaptopropyltrimethoxysilane, 3-chloropropyltrimethoxysilane and the like, among which,
3-methacryloxypropyltrimethoxysilane and 3-
Glycidoxypropyltrimethoxysilane is preferably used. These compounds can impart excellent adhesion to metal surfaces.

The metal powder used in the invention of the present application is a metal material such as iron, aluminum, copper, brass, tin, nickel, stainless steel, silver, zinc, etc., in the form of flakes, spheres, rods, or stars. The metallic powder is in the form of drops, and has a particle size of 150 μm or less. In particular, metal powders of iron, nickel, stainless steel, and spherical or rod-shaped metal powder are preferable. In addition, by adding 1 to 50% by weight of the metal powder to the viscoelastic composition, spot welding can be favorably performed. By uniformly mixing the raw materials described above, a viscoelastic composition that is viscous at room temperature can be obtained.

When these compositions are heated to 50 to 60 ° C., the viscosity of the material is significantly lowered, and the composition is changed to a property that is easy to apply. As a result, industrially used methods such as spray coating and roll coater coating are possible, and coating can be performed easily and with high film thickness accuracy.

Further, other metal base materials may be laminated and used integrally. The integration is performed by a method using a press or a pressing force of laminating with a pressure roller such as metal or rubber.
An intermediate material layer of 0.4 times is formed, and metal powder is interposed between the upper plate and the lower plate to bring them into contact with each other. That is, it is possible to obtain a composite vibration-damping steel sheet that can be welded by forming a conducting circuit with metal particles, followed by heat curing and integration.

The viscoelastic composition used in the invention of the present application may optionally contain a polymerization inhibitor, a curing accelerator, and
An antioxidant can be added, and a filler or the like may be added. The two metal plates used in the invention of this application are iron,
It is an alloy such as copper, aluminum, duralumin, and stainless steel, or a steel plate coated with zinc, chromate, zinc phosphate, or the like, a coated steel plate, and the like.
1 to 5.0 mm, preferably 0.2 to 3.2 mm is suitably used.

Further, what is important for obtaining the composite type vibration-damping metal plate of the present invention is the manufacturing method in which the thickness of the intermediate material layer is controlled, and the metal powder added to impart conductivity is added. In order to obtain the intermediate layer thickness 0.95 to 0.4 times the particle size of, it is achieved by optimizing the coating method and pressure bonding method according to the material viscosity.

The intermediate layer material used in the present invention has a viscous or liquid state under normal temperature to 60 ° C., which is suitable for uniformly coating the metal plate. Can be performed by a spray method, a roll coater method, a comma coater method, a curtain flow coater method, a die coater method, or the like. Further, a method using a pressure roll or the like is preferable for laminating and laminating another metal plate on the metal plate coated with the composition. As the pressure bonding roll, a metal roll, a resin roll, a rubber roll, or the like is used, and depending on the properties of the intermediate material, it may be a combination of rolls of the same material or a combination of rolls of different materials. it can.

According to the invention of the present application, by using a viscoelastic composition containing liquid polybutadiene and a liquid tackifier as main components, there are few safety and health problems, and coating workability is greatly improved. You can As a result, it is possible to obtain a composite type vibration-damping metal plate having both vibration-damping properties, post-processability, and weldability.

The invention of this application will be described below with reference to examples. Each performance evaluation was performed as follows. For uncured material viscosity, use a B-type viscometer to measure
The viscosity was measured in a temperature atmosphere of ° C. Adhesive strength measurement The viscoelastic composition was adjusted to an intermediate layer thickness of 0.10 mm between two cold-rolled steel sheets having a thickness of 0.8 mm, and the temperature was 150 ° C. by hot pressing.
25m wide from a vibration-damped metal plate that has been heat-cured for 10 minutes
m, length 200 mm, cut into test pieces, shear adhesive force is JIS-K-6850, peel adhesive force is JIS-K-
It measured according to 6854. Viscoelasticity measurement Viscoelasticity measurement was carried out by heating a sheet-shaped test piece at 150 ° C for 10 minutes with a bipron tester from -100 ° C to 1
The storage elastic modulus (E ′) and the loss angle tangent (tan δ) were measured in the temperature range of 50 ° C. Ta of frequency 100 Hz
The maximum value of nδ and E ′ at that temperature were measured. Vibration damping measurement From a damping metal plate obtained by adjusting the viscoelastic composition to an intermediate layer thickness of 0.10 mm between two cold-rolled steel plates having a thickness of 0.8 mm, a width of 25 mm and a length of 300 mm are obtained. The cut-out test piece has a frequency of 500 Hz by the mechanical impedance method.
The loss coefficient (η) of the temperature dependence was measured. Spot Weldability Measurement Spot welding was performed on a test piece of a vibration-damping metal plate obtained by adjusting the viscoelastic composition to an intermediate layer thickness of 0.10 mm between two cold-rolled steel plates having a thickness of 0.8 mm. . Spot welding is a direct spot welding machine, with class A welding conditions,
Specifically, using a copper electrode with a diameter of 6φ, a pressing force of 250k
g, 1 point welding of a vibration-damping metal plate and a cold-rolled steel plate single plate having a thickness of 1.6 mm was performed under the condition of 12 cycles at a welding current of 9800 A, and an appropriate spot welding rate was measured.

[0023]

【Example】

Example 1 1.2 polybutadiene having a number average molecular weight of about 2900 and having methacryloyloxy groups at both ends in a liquid state at room temperature (NISSO-PB, TE-2000 (registered trademark) manufactured by Nippon Soda Co., Ltd.) was used as a base polymer. , Base polymer 100
30 parts by weight of an aromatic petroleum resin (Oligotex 1020 (registered trademark) manufactured by Mitsubishi Petroleum Co., Ltd.) that is liquid at room temperature is used per part by weight.
Parts by weight, 0.5 parts by weight of 3-methacryloxypropyl trimethoxysilane and 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane (Nippon Yushi Co., Ltd. Perhexa-3M (registered trademark) (Name)) 1.0 part by weight was added, and the mixture was homogenized with a mixer set to a temperature of 50 ° C. In addition, metallic nickel powder with a particle size of 100 μm or less
A part by weight was added and dispersed uniformly to obtain a liquid viscoelastic composition shown in Table 1. For these, the viscosity was measured as a property evaluation before curing. Also, as the performance after heat curing,
Table 3 and FIG. 1 show the results of measuring and evaluating the dynamic viscoelastic characteristics, the adhesiveness after forming the vibration damping metal plate, the vibration damping property, and the spot weldability. Examples 2 and 3 Instead of 30 parts by weight of the aromatic petroleum resin which was liquid at room temperature in Example 1, 50 and 100 parts by weight of the same resins were used, respectively, and the viscoelastic composition shown in Table 3 and FIG. 1 was used. Got

Comparative Example 1 The number average molecular weight of 2,500 having a terminal carboxyl group,
1.2 Polybutadiene (Nisso-P manufactured by Nippon Soda Co., Ltd.
B and G-2000 (registered trademark)) were used as base polymers, and the other components were a viscoelastic composition that was liquid at room temperature and had the same composition as in Example 1. The results are shown in Table 3 and FIG. Comparative Example 2 Solid polybutadiene rubber (BR-0 manufactured by Japan Synthetic Rubber Co., Ltd.)
1 (registered trademark)), 50 parts by weight of alicyclic petroleum resin (Arcon M-100 (registered trademark) manufactured by Arakawa Chemical Co., Ltd.), which is solid at room temperature, and 3-methacryloxypropyl trimethoxysilane. 0.5 parts by weight and 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane 1 part by weight are kneaded and then dissolved in toluene to obtain a solvent-based viscoelasticity having a concentration of 20% by weight. It was a composition. The results are shown in Table 3 and FIG.

Example 4 1.2 polybutadiene (NISSO-PB, TEA-1000 (registered trademark) manufactured by Nippon Soda Co., Ltd.) having a number average molecular weight of about 1900 and having an acryloyloxy group at both ends, which is liquid at room temperature, is a base polymer. 50 parts by weight of an aromatic petroleum resin (Oligotex 1020 (registered trademark) manufactured by Mitsubishi Petroleum Co., Ltd.) which is liquid at room temperature and 100 parts by weight of 3-methacryloxypropyltrimethoxysilane. 5 parts by weight, 1.0 part by weight of 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane (Perhexa 3M (registered trademark) manufactured by NOF CORPORATION)
The mixture was homogenized with a mixer set to a temperature of 50 ° C. Further, 15 parts by weight of metallic nickel powder having a particle size of 100 μm or less was added to obtain a liquid viscoelastic composition uniformly dispersed. For these, the viscosity was measured as the property before curing. As the performance after thermosetting, the adhesiveness, the vibration damping property, and the spot weldability after the dynamic viscoelastic characteristic damping metal plate was measured, and the results are shown in Table 4 and FIG.

Example 5 1.2 polybutadiene (NISSO-PB, TE-2000 manufactured by Nippon Soda Co., Ltd.) having a number average molecular weight of about 2900 and having methacryloyloxy groups at both ends in a liquid state at room temperature.
(Registered trademark)) as a base polymer,
50 parts by weight of a hydrocarbon-based petroleum resin (Rigaletz-1018 (registered trademark) manufactured by Rika Hercules Co., Ltd.) which is liquid at room temperature, and 0.5 parts by weight of 3-methacryloxypropyltrimethoxysilane. , 1-bis (t
-Butylperoxy) 3,3,5-trimethylcyclohexane (Perhexa 3M (registered trademark) manufactured by NOF CORPORATION)
1.0 part by weight was homogenized with a mixer set to a temperature of 50 ° C. In addition, metallic nickel powder with a particle size of 100 μm or less
A part of the liquid viscoelastic composition was added in an amount of 1 part by weight and uniformly dispersed. For these, the viscosity was measured as the property before curing. Further, as the performance after thermosetting, the dynamic viscoelastic property, the adhesiveness, the vibration damping property, and the spot weldability after forming the vibration damping metal plate were measured, and the results are shown in Table 5 and FIG.

Example 6 A viscoelastic composition was obtained by using the same amount of 3-glycidoxypropyltrimethoxysilane in place of 0.5 of 3-methacrylochitopropyltrimethoxysilane of Example 5. For these, the viscosity was measured as the property before curing. Further, as the performance after thermosetting, the dynamic viscoelastic property, the adhesiveness, the vibration damping property, and the spot weldability after forming the vibration damping metal plate were measured, and the results are shown in Table 5 and FIG.

From the results shown in Table 3, in Examples 1 to 3, the viscosity at 50 ° C. was 500 poise or less, and compositions having excellent coatability were obtained. As a property after heat curing, a vibration-damping metal plate which exhibits excellent properties at room temperature and also has excellent adhesiveness, vibration damping property, and spot weldability can be obtained. On the other hand, in the case of Comparative Example 1, the liquid composition is the same as in the Example, but the thermosetting reaction does not occur, and the vibration damping metal plate cannot be obtained. Further, in the case of Comparative Example 2, a solvent-based composition is used, and a drying step is required, which is a safety and health problem. Also,
The performance level is low even as a damping metal plate. In Example 4,
This is the case where 1.2 polybutadiene having both acryloyloxy groups at both ends was used as a base polymer, and as shown in the results shown in Table 4, an excellent vibration-damping metal plate can be obtained. In addition, in Example 5, a hydrocarbon-based resin was used as the liquid tackifying resin, and from the results shown in Table 5, it was possible to obtain a vibration-damping metal plate having excellent performance.

[0029]

Industrial Applicability As described above, the invention of the present application has a problem in producing a vibration-damping metal plate having a thermosetting resin as an intermediate layer by using a viscoelastic composition which is liquid at room temperature. It is possible to obtain a vibration-damping metal plate that can improve the coating performance and has no problem in terms of safety and hygiene because it wants to use a solvent, etc., and that has excellent vibration-damping and adhesive properties. Became.

[0030]

Table 1 Actual Examples (parts by weight) Example 1 Example 2 Example 3 * 1 Methacryloxy group-terminated 100 100 100 100 1.2 Polybutadiene * 2 Aromatic petroleum resin 30 50 100 * 3 3 -methacryloxy fluoropolytril Methoxysilane 0.5 0.5 0.5 0.5 * 4 1,1-Vise (t-butylperoxy) 1 1 1 3,3,5-trimethylcyclohexane hydroquinone 0.01 0.01 0.01 metallic nickel powder 15 15 15 Isomorphic concentration 100% 100% 100%

Table 2 Comparative Example Comparative Example 1 Comparative Example 2 * 5 Carboxyl group-terminated 100-1.2 Polybutadiene * 6 cis 1.4 Polybutadiene 100 Aromatic petroleum resin 50-* 7 Alicyclic petroleum resin -50 3-methacryloxy Propyltrimethoxysilane 0.5 0.5 1.1-Vise (t-butylperoxy) 1 1 3,3,5-trimethylcyclohexane Hydroquinone 0.01 0.01 Metallic nickel powder 15 15 Toluene-756 Solid concentration (wt %) 100% 20% * 1 NISSO-PB TE-2000 manufactured by Nippon Soda Co., Ltd.
(Registered trademark name) * 2 Mitsubishi Petroleum Corporation Oligotex 1020 (registered trademark name) * 3 Shin-Etsu Silicone KBM-503 (registered trademark name) * 4 NOF Corporation Perhexa 3M (registered trademark name) * 5 Japan Soda Co., Ltd. NISSO-PBC-2000
(Registered trade name) * 6 BR-01 (registered trade name) manufactured by Japan Synthetic Rubber Co., Ltd. * 7 Alcon M-100 (registered trade name) manufactured by Arakawa Chemical Co., Ltd.

Table 3 Examples Comparative Examples Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 1. Viscosity 410 410 390 450 110 110 2. Dynamic viscoelasticity (100Hz) Not cured Tanδ peak temperature 10 ° C 28 ° C 40 ° C 5 ° C Tanδ 1.10 1.02 0.99 0.45 E ¹ (dyne / cm ² ) 3.0E + 0.8 1A + 0.8 1.01 E + 0.8 1.5 E + 0.8 3. Adhesiveness Gap strength (Kgf / cm ² ) 95 89 78 32 Peel strength (Kgf / 2.5cm) 5.9 5.0 4.5 3 4. Vibration damping (500Hz) Loss coefficient 0.40 0.31 0.29 0.09 Optimum temperature 15 ℃ 30 ℃ 40 ℃ 10 ℃ 5. Spot Weldability Good Good Good Good Good (Normal welding rate) (100%) (100%) (100%) (98%)

[Table 4] Material composition Example 4 * 8 Acryloyloxy terminal 100 parts by weight 1,2 polybutadiene aromatic petroleum resin 50 3-methacryloxypropyltrimetho 0.5 xysilane 1,1-bis (t-butylperoxy) 1 3 1,3,5-Trimethylcyclohexane Hydroquinone 0.01 Metallic nickel powder 15 Characteristic value 1. Viscosity (poise) 405 2. Dynamic viscoelasticity (40 Hz) Tanδ peak temperature 25 ° C Tanδ 1.13 E ¹ (dyne / cm ² ) 2.1E + 0.8 3. Adhesiveness Shear strength (Kgf / cm ² ) 85 Peel strength (Kgf / 2.5 cm) 7.0 4. Vibration damping (500Hz) Loss factor 0.35 Optimum temperature 29 ° C 5. Good spot weldability (normal welding rate) (99%) * 8 Made by Nippon Soda Co., Ltd. (registered trademark NISSO-PB
(TEA-1000)

[Table 5] Material composition Example 5 Example 6 Methacryloyloxy group-terminated 100 parts by weight 100 parts by weight 1.2 Polybutadiene * 9 Hydrocarbon petroleum resin 50 50 3-methacryloxypropyltrimethoxysilane 0.5-3 glycid Xypropyltrimethoxysilane 0.5 * 10 1,1-bis (t-butylperoxy) 1 1,3,3,5-trimethylcyclohexane hydroquinone 0.01 0.01 Metallic nickel powder 15 15 Characteristic value 1. Viscosity 470 460 2. Dynamic viscoelasticity (40 Hz) Tanδ peak temperature 30 ° C 30 ° C Tanδ 1.17 1.15 E1 (dyne / cm ² ) 2.4E + 0.8 2.5E + 0.8 3. Adhesiveness Shear strength (Kgf / cm ² ) 95 90 Peel strength (Kgf / 2.5 cm) 5.0 5.2 4. Vibration damping (500Hz) Loss coefficient 0.30 0.30 Optimum temperature 35 ° C 35 ° C 5. Good spot weldability Good (Normal welding rate) (100%) (100%) * 9 Rika Hercules (registered trademark Rigatex-1018) * 10 Shin-Etsu Silicone (registered trademark KBM-40)
3)

[Brief description of drawings]

FIG. 1 shows temperature dependence of loss coefficient (mechanical impedance method 500 Hz).

FIG. 2 shows temperature dependence of loss coefficient (mechanical impedance method 500 Hz).

FIG. 3 shows temperature dependence of loss coefficient (mechanical impedance method 500 Hz).

Claims (2)

[Claims] 1. (A) 100 parts by weight of a modified polybutadiene rubber having an acryloyloxy group or a methacryloyloxy group at both terminals of the polybutadiene molecular skeleton and having a number average molecular weight of 500 to 10,000 and being liquid at room temperature, B) Adhesive-adding resin having a glass transition point of 20 ° C. or lower and being liquid at room temperature 10 to 200 parts, (C) Crosslinking catalyst 0.1 to 10 parts (D) Silane-based surface modifier 0.1 A composite type vibration-damping metal plate, characterized in that a cured product of a viscoelastic composition comprising 10 parts of each component is laminated between two metal plates. 2. A cured product of a viscoelastic composition obtained by adding 1 to 100 parts by weight of a metal powder having a particle size of 150 μm or less to the viscoelastic composition of claim 1 as an intermediate layer thickness between two metal plates. A composite type vibration-damping metal plate, characterized in that the powder is laminated at 0.9 to 0.45 times the maximum particle size of the powder.