JPH0539560A - Composite dumping material excellent in peeling resistance on end face - Google Patents

Abstract

PURPOSE:To provide a composite dumping material excellent in corrosion resistance, adhesion property and peeling resistance on end faces. CONSTITUTION:This composite material is manufactured by forming a vapor deposition plating layer comprising 0.5-40wt.% Mg and the balance substantially Zn on the surface of a metal sheet, for example, a steel sheet, etc., and laminating a pair of these metal plates with a viscoelastic resin layer or a viscoelastic resin layer containing a conductive filler interposed in a sandwich structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite type damping material used in building materials, automobiles, home appliances, etc.
The present invention relates to a composite type vibration damping material having excellent adhesion of laminated materials. The metal plate used in the present invention includes Fe and Fe.
In addition to the base alloys, non-ferrous metals such as Cu and Al and their alloys are included. In the following description, the most representative steel sheet will be mainly described.

[0002]

2. Description of the Related Art Conventionally, in the fields of vehicles, ships, home appliances, etc., including building materials, various composite damping materials have been used for the purpose of preventing noise caused by vibration itself and resonance vibration. .. Among them, the composite type damping material in which a viscoelastic resin layer is sandwiched between a pair of metal plates is used for a wide range of applications due to the excellent mechanical properties of the steel plate and the excellent damping performance of the viscoelastic resin layer. Is expected to develop. In using such a composite type damping material as a structural member that requires corrosion resistance and adhesion, it is desired that the steel sheet used has the following characteristics. One is that the product has excellent corrosion resistance in the environment of use, and the other is that it has a high affinity for the viscoelastic resin and a high adhesion or adhesion strength. From the viewpoint of corrosion resistance, use of zinc or zinc alloy plated steel sheet is considered.

[0003]

The zinc or zinc alloy plated steel sheet obtained by the electroplating method or the hot dipping method does not always show sufficient corrosion resistance. Therefore, in the composite type damping steel plate using the plated steel plate as described above, corrosion starts from the end portion thereof and the adhesive force between the resin and the steel plate interface decreases,
There is a problem that the opening phenomenon occurs from the end surface of the steel sheet.

As described above, the conventional Zn-based plated steel sheets have problems in corrosion resistance and the like, and the demands of users have become more sophisticated in recent years, and these steel sheets have become insufficient. The present invention has been made in view of the above circumstances, and an object thereof is to provide a composite vibration damping material having excellent corrosion resistance, adhesion, and end face peeling resistance.

[0005]

Means for Solving the Problems The present invention which has achieved the above object is a composite type 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, It is a gist to form a vapor-deposited plated layer containing Mg: 0.5 to 40% by weight and the balance substantially consisting of Zn on at least the surface of the viscoelastic resin layer side of the metal plate. ..

[0006]

The present inventors have studied various Zn-based alloys, plating means, etc. in order to solve the above-mentioned problems found in Zn-plated steel sheets, and as a result, formed by the vapor deposition method, and When a composite type vibration damping material was manufactured from Zn-Mg alloy plated steel sheet containing a specific amount of Mg, the corrosion resistance was significantly improved, and due to the burr of the composite type vibration damping material when cutting to the design dimension during use. The end surface of the metal plate is Zn-M
By being covered with the g alloy plating layer, the corrosion resistance of the end face of the composite type vibration damping material is improved, and the peeling resistance of the end face is improved,
I knew that the phenomenon of mouth opening did not occur.

In the present invention, Zn--Mg is formed by the vapor deposition method.
It is limited to the alloy-plated one, but this is for the following reason. That is, also for Zn-Mg alloy plating, it is possible to form the alloy plating layer by the same hot-dip plating method as the conventional one, and it has been partially put into practical use. The temperature may become too high, which may adversely affect the subsequent molding process. Because, if the temperature of the plating bath becomes too high, Fe will be added to the boundary between the plating layer and the base steel plate.
This is because a brittle alloy layer containing is generated, and the plating layer is easily peeled off during molding. In addition, even if an electroplating method using a normal aqueous solution is adopted, an optimal Zn-Mg alloy plating layer cannot be formed because the unipolar potentials of Zn and Mg are too different.

However, for example, a vacuum vapor deposition method may be employed, Zn and Mg may be heated and vaporized in separate crucibles, a metal plate may be disposed on top of them, and Zn and Mg may be vapor deposited on the metal plate. For example, the evaporation amounts of Zn and Mg can be arbitrarily adjusted by appropriately controlling the heating temperature of each crucible, and the plating composition can be arbitrarily changed accordingly. The vapor deposition is usually performed under vacuum in order to prevent oxidation of the vapor-deposited metal, but the present invention is not an exception, and normally the pressure is 10 ^-2 Torr.
It is carried out under a vacuum condition of a degree or less.

Any means may be adopted for heating Zn and Mg, and especially Zn has a low melting point (419 ° C.),
Also, since the vapor pressure is low, general electrical resistance heating can sufficiently serve the purpose, but Mg has a low melting point (651 ° C).
However, since the vapor pressure is high, it is preferable to employ a high-energy beam such as an electron beam having a high heat-converging property for heating and vaporizing. In any case, by independently controlling the heating temperatures of Zn and Mg, the ratio of the evaporation amounts of both metals can be freely adjusted, and accordingly, the composition ratio of Zn / Mg that constitutes the vapor deposition plated layer. Etc. can be changed freely.

Moreover, since the vapor deposition plating is carried out under high vacuum conditions as described above, there is no fear that an oxide film will be formed on the plating adhered surface of the steel sheet and the adhesion will be deteriorated, and the boundary surface of the steel sheet will be fragile. There is no fear that the interlayer bonding force will be reduced due to the formation of an alloy layer or the like.

The specific method for vapor deposition plating is not a special one. For example, Zn and Mg are simultaneously heated and vaporized from individual crucibles in a vacuum chamber, and an appropriately heated steel plate is provided above them. It is possible to employ a method in which vapor deposition plating is continuously performed while running the machine, a method in which the above operation is carried out in a batch system, or the like.

Next, regarding the composition of the Zn-Mg alloy constituting the plating layer, in order to achieve the object, the composition is 0.5 to 40% by weight of Mg and the balance is substantially Zn. There must be. When the amount of Mg is less than 0.5% by weight, the effect of adding Mg is not substantially exerted, and there is no difference in corrosion resistance from the plating layer of Zn alone,
Exfoliation from the end surface of the composite type vibration damping material increases.

On the other hand, when the amount of Mg exceeds 40% by weight, metallic Mg that does not alloy with Zn in the Zn-Mg alloy layer.
The number of phases increases, the corrosion resistance deteriorates, and the cost increases.

However, the Zn-Mg alloy plating layer having a Mg content of 0.5 to 40% by weight exhibits excellent corrosion resistance as compared with the pure Zn plating layer, and also has a sacrificial anticorrosive action inherent to Zn-based plating. In addition, the corrosion resistance of the entire plated steel sheet can be significantly improved in combination with the characteristic that the adhesion to a steel sheet or the like is very excellent.

The thickness of the plating layer is not particularly limited, but the purpose of exhibiting corrosion resistance is generally achieved by setting the thickness to about 1 g / m ² or more. In addition, Z
The type of the metal plate on which the n-Mg alloy plating is applied is not particularly limited.

The thickness and type of the resin layer sandwiched between the pair of metal plates are selected according to the application, but for example, a damping steel plate is generally 3
Film thicknesses of 0-80 μm are utilized. Examples of the viscoelastic resin used here include polystyrene, AS resin, ABS resin, MS resin, styrene-based resin such as impact-resistant polystyrene, polymethyl acrylate, polymethyl methacrylate, acrylic copolymer, and the like. ) Acrylic resins, polyvinyl chloride, vinyl chloride-vinyl acetate copolymers, vinyl chloride-acrylic acid ester copolymers and other vinyl chloride resins, polyvinyl acetate, ethylene-olefin copolymers, ethylene-vinyl acetate copolymers Polymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid ester copolymers, propylene-ethylene copolymers, propylene-butene copolymers and other propylene-based resins, and various thermoplastic resins such as amorphous polyesters Can be illustrated.

Further, styrene-butadiene, natural rubber,
Butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, acrylic rubber, ethylene / acrylic rubber, E
Elastomers such as PDM and thermosetting resins such as epoxy resins, phenolic resins, saturated and unsaturated polyester resins can also be used.

Further, 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 steel sheet, such as vibration-damping property, heat resistance, workability, etc. It is selected according to.

The cross-linking agent in the case of using a thermosetting resin is selected according to the functional group of the viscoelastic resin used, but for example, a resin flow agent such as an organic sulfur compound, a polyamine, a polyol or an organic compound. Examples thereof include peroxides, amino resins, isocyanates, epoxies, polyamidoamines and acid anhydrides.

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

The method for producing the composite type vibration-damping steel sheet according to the present invention is not particularly limited. For example, a known lamination method such as a hot pressing method or a continuous lamination method using a heating roll may be used in a production scale or an application. It is used according to the field.

[0022]

EXAMPLE A cold-rolled steel sheet having a thickness of 0.8 mm was used as a metal plate, its surface was cleaned by electrolytic degreasing, and then Zn-Mg alloy plating was performed by a vacuum deposition plating method.

In performing vacuum deposition plating, 1
^Two crucibles are arranged next to each other in a device depressurized to a pressure of 0 ^-2 Torr or less, and Zn and Mg are charged into each crucible, and Zn and Mg are heated to evaporate and the upper part While running the cold rolled steel sheet preheated to 200 ° C,
Zn-Mg alloy vapor deposition plating was applied to both surfaces of the steel sheet.

In this vapor deposition plating step, Zn and Mg
The amount of evaporation of each was adjusted according to the heating temperature of, and the composition of the vapor-deposited plating layer was set to Mg: 0.4 to 60% by weight and the balance: substantially Zn.

On the surface of the Zn-Mg alloy vapor-deposited steel sheet, 5 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a cross-linking agent was added, and the average molecular weight was 15,000, T.
Polyester resin of g = -10 ° C is used as a viscoelastic resin and applied and dried so that the dry film thickness is 50 μm.
The same another Zn-Mg alloy vapor-deposited steel sheet was overlaid and heated and pressed by a hot press to obtain a composite damping steel sheet. The conductive filler-containing viscoelastic resin layer was formed by adding 3 vol% of iron powder having a particle diameter of 60 to 80 μm to the above viscoelastic resin.

The composite type damping steel plate thus produced was used as JISZ237.
The salt spray test was carried out for 100 hours according to 1 and then the following evaluations were performed. The results are collectively shown in Table 1. T-peel strength: Measured according to JIS K6840. Opening property: The opening of the end face was visually evaluated. ◯: No open mouth ×: Open mouth Amount of red rust on the end face: The amount of red rust on the end face was visually observed. ◯: No red rust Δ: Little red rust ×: Red rust is large

For comparison, the same degreasing steel sheet as above was electroplated with Zn, and a composite type vibration damping steel sheet was similarly prepared and the same test was conducted. The results are also shown in Table 1.

[0028]

[Table 1]

As is clear from Table 1, the composite vibration-damping steel sheet produced by using the conventional pure Zn electroplated steel sheet is poor in the effect of preventing red rust on the end face and the peeling resistance, and the mouth opening phenomenon occurs.

On the other hand, the evaporated Zn--Mg according to the present invention
The composite type vibration-damping steel plate made of plated steel plate has excellent resistance to red rust and peeling resistance on the end face, and no opening phenomenon occurs at all. However, when the amount of Mg in the evaporated Zn-Mg plated layer exceeds 40% by weight (Experiment No. 10 and 12)
And below 0.5% by weight (Experiment No. 9, 1
In 1), the red rust resistance and peeling resistance of the end face are poor, and the mouth opening phenomenon occurs.

When the amount of Mg in the evaporated Zn-Mg plating is 0.5% (Experiment Nos. 3 and 6), conventional pure Zn is used.
Although an excellent anticorrosion effect is exhibited as compared with the case of electroplating (Experiment No. 13), it is preferable to set the Mg content to 1% or more in order to utilize the characteristics of the present invention to the maximum extent. ..

[0032]

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

Claims (1)

[Claims] 1. A composite type 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, wherein at least the surface of the metal plate on the viscoelastic resin layer side comprises: M
g: A composite type vibration damping material having excellent end face peeling resistance, characterized in that a vapor deposition plating layer containing 0.5 to 40% by weight and the balance being substantially Zn is formed.