JPH0524154A - Composite damping material excellent in adhesion and corrosion resistance - Google Patents

Abstract

PURPOSE:To provide the above composite damping material excellent in adhesion, corrosion resistance and paintability. CONSTITUTION:In a composite damping material wherein a viscoelastic resin layer containing or not containing a conductive filler is sandwiched between a pair of metal plates, both inner and outer surfaces of each of the metal plates is coated with a resin in thickness of 0.3-10mum. 5-30wt.% of silica with a particle size of 4-50nm is added to the resin applied to the outer surface of each of the metal plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite vibration damping material used in building materials, automobiles, home appliances, etc., and more particularly to a composite vibration damping material having excellent adhesion and corrosion resistance of laminated materials. .

[0002]

2. Description of the Related Art Conventionally, building materials, vehicles, ships,
In the field of home appliances and the like, various vibration damping materials are used for the purpose of preventing vibration and noise accompanying the vibration. Among them, the composite type vibration damping material in which a viscoelastic resin layer is sandwiched between a pair of metal plates has a wide range due to the excellent mechanical properties of the metal plate and the excellent vibration damping performance of the viscoelastic resin layer. Expected to be expanded to applications.

[0003]

When the sandwich type composite damping material as described above is used as a structural member, it is desired to have the following characteristics with respect to the metal plate, such as a steel plate, to be used. It is rare.

One is that the product is excellent in corrosion resistance against the use environment, and since it is often used by painting, it is desired that the paintability of various paints is excellent. The other is that it has a great affinity for viscoelastic resins,
That is, the adhesiveness or the adhesive strength is large. From the viewpoint of corrosion resistance, it is possible to use zinc or zinc alloy plated steel sheet, but the adhesion of viscoelastic substances or the paintability to paint is poor, and special treatment such as phosphate treatment is performed to improve these. There was a need. In addition, the demands of users have become higher and higher in recent years, and the corrosion resistance of these metal plates has become insufficient.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a composite type vibration damping material having excellent adhesion and corrosion resistance.

[0006]

Means for Solving the Problems The present invention, which has achieved the above object, is a composite vibration damping material in which a viscoelastic resin layer or a viscoelastic resin layer containing a conductive filler is sandwiched between a pair of metal plates, The gist of the metal plate is that at least the inner surface of the metal plate is coated with a resin to a thickness of 0.3 to 10 μm.

[0007]

The metal plate used in the present invention is, for example, a commonly used zinc or zinc alloy-plated steel plate, and has a resin applied to at least the joint surface side with the viscoelastic resin layer, preferably both surface sides. However, the manufacturing method thereof is not particularly limited.

As the resin to be applied on the metal plate in advance, acrylic, epoxy, urethane, polyethylene, polyester or the like resin is applied. In coating these resins, any form such as an aqueous solution, emulsion, or organic solvent solution can be applied according to the properties of the resin.

Among the above, an epoxy resin having excellent adhesiveness is suitable as the resin to be applied to the contact surface side with the viscoelastic resin layer, but the resin applied to the viscoelastic resin layer and the metal plate is A resin compatible with the viscoelastic resin layer is preferable from the viewpoint that it is preferable to improve the adhesion force by utilizing the compatibility. For example, when the viscoelastic resin layer is a polyester resin, a similar polyester resin is desirable as the resin applied to the metal plate.

The thickness of the resin applied to the metal plate is 0.3.
The reason for limiting the thickness to -10 μm is that if it is thinner than 0.3 μm, the effect of improving the adhesion force due to the compatibility with the viscoelastic resin layer and the effect of improving the corrosion resistance of the surface exposed to the corrosive environment cannot be expected. Furthermore, the composite type vibration damping material of the present invention is often used in a region where welding is required, and in such a case, a conductive filler is added to the viscoelastic resin layer to improve spot weldability. The resin applied to the metal plate is 10
When it exceeds μm, the weldability is impaired, so the upper limit was set at 10 μm.

In addition, silica may be contained in the resin previously applied to the metal plate for the purpose of improving corrosion resistance, and the particle size at this time is preferably 4 to 50 nm. The smaller the particle size, the better the corrosion resistance, but if it is less than 4 nm, it becomes special silica, which is very expensive, and it is not economical. On the other hand, if it exceeds 50 nm, the coating property is significantly deteriorated.

Further, the amount of silica added is preferably 5 to 30% by weight, and if it is less than 5% by weight, the effect of improving corrosion resistance cannot be recognized, and if it exceeds 30% by weight, the film-forming property of the film deteriorates and the corrosion resistance, Paintability deteriorates.

Since the addition of silica is intended only to improve the corrosion resistance, it is particularly effective on the surface exposed to the corrosive environment (outer surface), but the viscoelastic resin layer side surface (inner surface) No problem occurs even if it is added to the resin.

Further, in order to improve the corrosion resistance, it is also possible to carry out a commonly used chromate treatment under the resin film. The chromate treatment may be any of reaction type, coating type and electrolytic type. The amount of the attached chromate is determined according to the environment of use.

Next, the type and thickness of the viscoelastic resin layer sandwiched between the pair of metal plates are selected according to the application, but for example, as a damping steel plate, it is generally 30 to 80 μm.
A film thickness of m is used.

As the viscoelastic resin used here, polystyrene, AS resin, ABS resin, MS resin,
Styrenic resins such as high impact polystyrene, polymethyl acrylate, polymethyl methacrylate, (meth) acrylic resins such as acrylic copolymers, polyvinyl chloride, vinyl chloride / vinyl acetate copolymers, vinyl chloride / acrylic acid Vinyl chloride resins such as ester copolymers, polyvinyl acetate, ethylene / α-olefin copolymers, ethylene / vinyl acetate copolymers, ethylene / acrylic acid copolymers, ethylene / methacrylic acid ester copolymers, propylene Examples thereof include propylene-based resins such as ethylene copolymers and propylene-butene copolymers, and various thermoplastic resins such as amorphous polyesters.

Further, styrene-butadiene rubber, natural rubber, butadiene rubber, chloroprene rubber, butyl rubber,
Elastomers such as nitrile rubber, acrylic rubber, ethylene-acrylic rubber and EPDM, and thermosetting resins such as epoxy resin, phenol resin, saturated and unsaturated polyester resin can also be used.

These resins can be used alone or as a mixture of two or more kinds, and the performance required for the composite type vibration damping material, such as vibration damping property, heat resistance,
It is selected according to workability.

When the thermosetting resin is used, the cross-linking agent is selected depending on the functional group of the viscoelastic resin to be used. For example, a resin vulcanizing agent such as an organic sulfur compound, a polyamine, a polyol, an organic peroxide. , Amino resins, isocyanates, epoxies, polyamidoamines, acid anhydrides and the like.

When the composite type vibration damping steel material of the present invention is used in a region where welding is required, a conductive filler is added to the viscoelastic resin layer for the purpose of improving spot weldability. However, examples of the conductive filler include iron powder, carbon black, Ni powder, and a metal net.

The method for producing the composite damping material according to the present invention is not particularly limited, and known laminating methods such as a hot pressing method and a continuous laminating method with a heating roll may be used in the production scale and application. It is used according to the field.

[0022]

[Examples] Hot-dip galvanized steel sheet, alloyed hot-dip galvanized steel sheet, electrogalvanized steel sheet, produced by a conventional method,
After subjecting each of the Zn-Ni alloy-plated steel sheets to solvent and alkali degreasing, some of the test steel sheet pieces were subjected to a commercially available reactive chromate treatment, and then the resin solutions prepared in various compositions were applied to each bar. Apply with a coater, 100
A resin-coated metal plate was produced by baking at 30 ° C. for 30 seconds.

Next, 5 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a cross-linking agent was added to produce an average molecular weight of 1
2,000, Tg = -10 ℃ polyester viscoelastic resin,
Various composites are prepared by coating and drying the above resin-coated metal plate so that the dry film thickness is 50 μm, and then stacking the same metal plates so that the viscoelastic resin layer is sandwiched between them, and heating and pressing with a heat press. A type damping steel plate was produced.

The conductive filler-containing viscoelastic resin layer is
The viscoelastic resin was formed by adding 3 vol% of iron powder having a particle size of 60 to 80 μm.

The following evaluations were performed on the various composite vibration damping steel plates produced. The results are shown in Table 1. T peel strength was measured according to JIS K 6840. Corrosion resistance After sealing the back and end faces with tape, JIS Z 23
A salt spray test was conducted according to No. 71, and the time until 1% of white rust was generated was measured.

Paintability Melamine-based paint (Amilac 1000 manufactured by Kansai Paint Co., Ltd.)
Was coated with a bar coater so that the dry coating film had a thickness of 20 μm, and then baked at 130 ° C. for 20 minutes. The adhesiveness of the coating film was evaluated by performing a 1 mm cross stitch test and the coating film residual rate after the tape test. Weldability Weldability was evaluated only for the test piece in which a conductive filler was added to the viscoelastic resin layer.

That is, a test piece was cut into a shape of a width of 30 mm and a length of 100 mm from the composite type vibration-damping steel plate prototyped in this example, and 10
00 samples were taken. Using this sample, spot weldability was evaluated at an overlap margin of 30 mm.

The welding conditions were electrode pressure of 200 kgf, welding current of 8 KA and energizing time of 12 cycles.

The evaluation method was to observe the surface condition of the spot-welded test piece after welding, total the number of welding defects such as perforations, burns, and non-energization on the surface of the steel sheet, and calculate the welding defect generation ratio by the ratio of the total number of welding tests. I asked.

[0030]

[Table 1]

As is clear from Table 1, conventional hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets (Experiment N
Nos. 11 and 12) have poor adhesion, corrosion resistance, and paintability.

When the resin adhesion amount is less than 0.3 g / m ² (Experiment No. 7), the adhesion and corrosion resistance are poor. When the particle size of silica is larger than 50 nm (Experiment No. 8), the coating property is poor, and when the amount of silica added is less than 5 wt% (Experiment No. 9), the corrosion resistance is poor, and 30 wt. % (Experiment No. 10), the adhesion, corrosion resistance and paintability are all inferior.

On the other hand, in the case of the composite type vibration damping material of the present invention (Experiments No. 1 to 6), it is found that the adhesion, the corrosion resistance and the paintability are all excellent. Further, the weldability is also excellent except for Experiment No. 6.

[0034]

EFFECTS OF THE INVENTION Since the present invention is constituted as described above, it is possible to provide a composite type vibration damping material having excellent adhesion, corrosion resistance and paintability. Therefore, it is possible to meet the user's high demand for the composite type vibration damping material in various fields such as construction, automobiles, home appliances and the like.

Claims (3)

[Claims] 1. A composite type vibration damping material comprising a pair of metal plates sandwiching a viscoelastic resin layer or a viscoelastic resin layer containing a conductive filler in a sandwich form, wherein the metal plate has 0.3 to 0.3% of resin on at least its inner surface. Ten
Composite type damping material with excellent adhesion and corrosion resistance, characterized by being applied in a thickness of μm. 2. A metal plate having a resin coated on both inner and outer surfaces, wherein at least the resin on the outer surface has a particle size of 4
The composite damping material having excellent adhesion and corrosion resistance according to claim 1, which contains 5 to 30% by weight of silica having a particle size of 50 nm. 3. The composite damping material having excellent adhesion and corrosion resistance according to claim 1, wherein the metal plate is zinc and a zinc-based alloy plated steel plate.