JP2010516511A - Bonded steel sheet with excellent vibration damping, sound absorption and workability - Google Patents

Abstract

The present invention relates to a bonded steel plate having excellent vibration damping properties, sound absorbing properties, and workability. More specifically, the present invention relates to a surface plate material and a support plate material that supports the surface plate material, having a predetermined viscosity and a sound absorbing property. It is manufactured by bonding using an adhesive resin that is excellent in vibration damping, and it can obtain excellent vibration damping and sound absorption from the material itself, and can greatly reduce the manufacturing cost, so far The present invention relates to a bonded steel sheet that has an effect of substituting an expensive steel material, has excellent molding processability, and can produce products by applying all conventional molding processes.

Description

  The present invention relates to a bonded steel plate having excellent vibration damping properties, sound absorbing properties, and workability. More specifically, the present invention relates to a surface plate material and a support plate material that supports the surface plate material, having a predetermined viscosity and a sound absorbing property. It is manufactured by bonding using an adhesive resin that is excellent in vibration damping, and it can obtain excellent vibration damping and sound absorption from the material itself, and can greatly reduce the manufacturing cost, so far The present invention relates to a bonded steel sheet that has an effect of substituting an expensive steel material, has excellent molding processability, and can produce products by applying all conventional molding processes.

  In general, a single steel plate itself has very poor sound insulation, sound absorption, vibration suppression, and heat insulation properties, and there are many limitations to use it widely in products exposed to noise, vibration, temperature changes, etc. there were. Conventionally, a sound absorbing material and a material having excellent vibration damping properties (for example, a vibration damping sheet, a vibration damping paint, a vibration damping tape, etc.) are sandwiched between two steel plates to compensate for the characteristics.

  However, when using a separate vibration-damping or sound-absorbing material as described above, it is not only troublesome that a separate material has to be installed at the time of construction. There was also a problem that the sound absorbing material had to be processed separately according to the shape of the steel sheet.

  In particular, even when manufacturing products using a single steel plate (for example, stainless steel), the strength of the steel plate itself is strong, so there is an advantage that it does not crack or crack, but the metal material hits the product and is annoying noise. As a matter of course, there is a problem inducing a vibration that is propagated by the steel plate at the time of impact. On the other hand, in the case of a single steel plate, the sound absorption effect is low due to the characteristics of the metal material, so there is a limit that can not be well blocked from the noise generated from the outside, and a separate sound absorbing material is added inside It is common to use them.

  In addition to this, the present inventor has an excellent exterior property while keeping a cheap cost, and at the same time, by using an adhesive resin having excellent sound absorption and vibration damping properties to mutually join different or similar metal materials, In addition to ensuring excellent sound absorption and vibration control properties, it is possible to ensure excellent molding processability with an adhesive resin having a predetermined viscosity, and it is manufactured by applying to various products that require molding process. This leads to the development of a bonded steel sheet that can be used.

  The present invention, which was devised to solve the above-mentioned conventional problems, is produced by bonding a surface plate material and a support plate material with an adhesive resin to produce a bonded steel plate, and thereby absorbing sound by the adhesive resin layer of the bonded steel plate. Of course, it is possible to greatly reduce the manufacturing cost, to ensure the same level of exterior properties as expensive materials, and to produce a bonded steel plate that is excellent in noise suppression and vibration suppression. Its purpose is to provide.

  In the present invention, the adhesive resin of the bonded steel sheet maintains a predetermined viscosity, so that the adhesive resin layer itself is not cracked when the bonded steel sheet is molded. It is an object of the present invention to provide a bonded steel sheet capable of increasing the property and sound absorption.

  In the present invention, when a single steel plate such as stainless steel, copper, aluminum, etc., which is relatively high, is used, the surface plate material exposed to the outside is excellent in order to solve the problem that the manufacturing cost is greatly increased. At the same time, the support plate material that supports the surface plate material is formed thick with a relatively cheap steel plate, using an adhesive resin that excels in vibration damping and sound absorption. It is an object of the present invention to make it possible to greatly reduce the manufacturing cost by joining the surface plate material and the support plate material.

  The present invention for achieving the above object is a bonded steel plate excellent in vibration damping properties, sound absorption properties, heat insulation properties and workability, and is arranged so as to face the surface plate material and the surface plate material, and supports the surface plate material And an adhesive resin layer that is disposed between the surface plate material and the support plate material, and interconnects the surface plate material and the support plate material, and the adhesive resin layer has a thickness of 0.02 to 0.1 mm. Start a bonded steel sheet characterized by having.

  Preferably, the adhesive resin has a viscosity of 2500 to 4500 cps.

  More preferably, the surface plate material and the support plate material have a bending rigidity of 10.5 to 16.5 Nm.

  Most preferably, the surface plate has a thickness of 0.1 to 0.5 mm, and the support plate has a thickness of 0.5 to 1.9 mm.

  According to an embodiment of the present invention, the adhesive resin layer is composed of 44 to 46% by weight of ethyl acetate, 40 to 42% by weight of vinyl acetate / acrylic copolymer, 8 to 10% by weight of isopropyl alcohol, 1 to 3% by weight of toluene, vinyl acetate. It consists of 3 wt% or less and acetaldehyde 0.1 wt% or less.

  Preferably, the surface plate material is any one selected from stainless steel, aluminum, and copper excellent in surface treatment and surface workability, and the support plate material is a galvanized steel plate, stainless steel, aluminum, a color steel plate, a cold rolled steel plate. And any one selected from pickled steel sheets.

  More preferably, a corrosion prevention coating layer is further formed on the lower surface of the support plate.

  The present invention has the following effects.

  First, by manufacturing a bonded steel sheet by bonding the surface plate material and the support plate material with an adhesive resin, the bonded resin layer of the bonded steel sheet has a sound absorbing function, as well as significantly reduces the manufacturing cost and is a conventionally expensive material. It is possible to provide a bonded steel sheet that is excellent in the effects of noise insulation, vibration suppression, and heat insulation.

  Secondly, the adhesive resin of the bonded steel sheet according to the present invention maintains a predetermined viscosity, so that the adhesive resin layer itself is not broken when the bonded steel sheet is molded. It is possible to provide a bonded steel sheet in which the layer can increase vibration damping properties, heat insulation properties, and sound absorption properties.

  Third, the present invention uses a surface plate material exposed to the outside in order to solve the problem that the manufacturing cost is significantly increased when a single steel plate such as stainless steel, copper, aluminum, etc., is used. Adhesive resin with excellent vibration damping and sound absorbing properties, with a thin plate made of steel with excellent beautification and workability, and at the same time, the support plate that supports the surface plate is made thick with a relatively cheap steel plate. The manufacturing cost can be significantly reduced by joining the surface plate material and the support plate material using the material.

It is a fragmentary perspective view for showing the structure of the joined steel plate concerning the Example of this invention. It is the vertical sectional view cut along the AA line of FIG. It is a frequency response function curve obtained from the sample of the bonded steel sheet according to the present invention. It is a frequency response function curve obtained from the sample of the bonded steel sheet according to the present invention. It is a frequency response function curve obtained from the sample of the bonded steel sheet according to the present invention. It is a frequency response function curve obtained from the sample of the bonded steel sheet according to the present invention. It is a frequency response function curve obtained from the sample of the bonded steel sheet according to the present invention. It is a frequency response function curve obtained from the sample of the bonded steel sheet according to the present invention. It is the photographic image which carried out the immersion test of the joining steel plate, and image | photographed with the electron microscope.

  Hereinafter, a bonded steel sheet according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a partial perspective view showing the structure of a bonded steel sheet according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view cut along the line AA in FIG.

  As shown in FIGS. 1 and 2, a bonded steel sheet 10 according to the present invention includes a surface plate member 11, a support plate member 12 that supports the surface plate member, and the surface plate member and the support plate member. It is made of an adhesive resin 13 for mutually joining the plate material and the support plate material.

  For the surface plate member 11 and the support plate member 12, all kinds of metal materials can be selected and bonded together with an adhesive resin 13. Preferably, the surface plate material 11 is stainless steel having excellent workability and corrosion resistance, and the support plate material 12 is selected from one of a galvanized steel plate, stainless steel, aluminum, a color steel plate, a cold rolled steel plate, and a pickled steel plate. Is. More preferably, a SUS300 series (most preferably SUS304) having particularly excellent workability and corrosion resistance is used as the surface plate material. Since the surface plate is a portion exposed to the outside when processing the bonded steel plate, it is desirable to use a material having excellent corrosion resistance and appearance.

  More preferably, the support plate 12 has sufficient strength to sufficiently support the surface plate material as well as the workability of the jointed steel plate to ensure the forming workability of the entire bonded steel plate. Select the steel grade. That is, as the support plate material, galvanized steel plate (Galvanized-Steel), stainless steel (Stainless), aluminum (Aluminium), color steel plate (Polyester Painted Steel Sheets), cold rolled steel plate (Cold Rolled Steel Sheets) and pickled steel plate (Pickled and) Oiled Steel Sheets) can be used. Here, the galvanized steel sheet is hot dip galvanized steel sheet (Galvanized Steel Sheets), electrogalvanized steel sheet (Electrolytic Galvanized Steel Sheets), galvannealed steel sheet (Galvannealed Steel Sheets), hot dip galvanized steel sheet (Aluminum Coated Steel Sheets). It should be interpreted in a broad sense including galvanium steel sheets (Zinc Aluminum Alloy Coated Steel Sheets).

  As described above, the surface plate material and the support plate material must have excellent formability in order to be formed into articles having various shapes using bonded steel plates. It is desirable to select and use a material having a bendingrigidity of 10.5 to 16.5 Nm to satisfy.

  The bending stiffness is calculated using an RKU (Ross Kerwin Ungar) method expressed by the following mathematical formula 1.

  Here, Bc is the bending rigidity, υ is the Poisson's ratio, and tc is the total thickness.

  In particular, when the bending stiffness is less than 10.5 Nm, there is a problem that it is bent even with a small force and is vulnerable to external impact after molding. When the bending stiffness exceeds 16.5 Nm, the molding processability is lowered. There is a problem that the surface plate material or the support plate material is peeled off when the bonded steel plate cannot be well formed into a product shape having a predetermined bend like a sink ball, fire gate, water storage tank, etc. is there.

  The adhesive resin 13 is disposed between the front plate member 11 and the support plate member 12 and functions to mutually bond the front plate member and the support plate member, and preferably has a thickness of 0.02 to 0.1 mm. To be formed. Since the adhesive resin is disposed between the surface plate material and the support plate material and functions to suppress vibration, sound absorption, and heat insulation, the entire bonded steel sheet should have excellent vibration suppression, sound absorption effect, and heat insulation effect. In other words, the adhesive resin layer not only bonds the surface plate material and the support plate material, but also serves to reduce vibrations and noise applied from the outside, and also serves as a heat insulating material. There is an advantage that the manufactured product itself has excellent vibration damping properties, sound absorption properties, and heat insulation properties due to the materials used.

  The adhesive resin 13 used in the bonded steel sheet of the present invention comprises 44 to 46% by weight of ethyl acetate, 40 to 42% by weight of acrylic copolymer, 8 to 10% by weight of isopropyl alcohol, 1 to 3% by weight of toluene, and 3% by weight of vinyl acetate. The acetaldehyde content is 0.1% by weight or less. The compositional components and contents as described above can maintain a predetermined viscosity at the same time as having sound absorption properties and bonding properties as a result of repeated experiments by the present inventor for a long period of time. This leads to the development of an adhesive composition that emits less.

  Desirably, the adhesive resin used in the present invention has a viscosity of 2500 to 4500 cps. This is because when the viscosity is less than 2500 cps, the viscosity is very small, so that the bonded surface plate is not firmly bonded to the support plate, and peeling occurs. There is a problem that the plate material is separated from the support plate material to which the plate is bonded, causing a step, and when the viscosity exceeds 4500 cps, the viscosity is very large. Problems such as cracking of the adhesive resin layer and bending of the surface plate material occur.

  Therefore, the adhesive resin used in the bonded steel sheet of the present invention is not only excellent in molding processability by maintaining a predetermined viscosity, but also has vibration damping, sound absorption and heat insulation effects to maintain such viscosity. There is an advantage that can be further increased.

  Table 1 below shows measured values obtained by measuring the formability of the bonded steel sheet, the presence or absence of peeling, and the sound insulation effect according to the viscosity of the adhesive resin.

* In terms of moldability, X is a step such as when bending processing is performed, such as over-curved, pressing or drawing, the adhesive resin leaks through the end faces of the bonded steel plates, or the bonded steel plates are separated from each other. Alternatively, the case where the adhesive resin is broken and cannot have a good adhesive force is shown, where Δ indicates a case where a part is found, and ○ indicates a case where the adhesive resin cannot be found at all.
* In the presence / absence of peeling, X indicates that no peeling occurs, Δ indicates that a part is found, and O indicates that no peeling can be found.
* When the noise of a single steel plate was set to 1, the sound insulation effect was shown by comparing the performance of sound insulation by the bonded steel plate.

  As can be seen from Table 1, it was found that when the viscosity of the adhesive resin is 2500 to 4500 cps, the molding processability is excellent, peeling does not occur, and the sound insulation effect is also excellent compared to a single steel plate.

  Preferably, the surface plate has a thickness of 0.1 to 0.4 mm, the support plate has a thickness of 0.4 to 1.2 mm, and the adhesive resin that joins the surface plate and the support plate has a thickness of 0.02 to 0.1 mm. Form to have.

  Since the present invention is exposed to the outside in order to solve the problem that the manufacturing cost is significantly increased when using a single steel plate such as stainless steel, which is relatively high, a surface that requires excellent corrosion resistance and workability. At the same time as the plate material is formed thin, the support plate material that supports the surface plate material inside is formed thick with a relatively cheap steel plate, and the surface plate material and the support plate material are formed using an adhesive resin that is excellent in sound absorption, vibration suppression, and heat insulation. Has the technical characteristics of joining.

  Desirably, the surface plate is manufactured to a thickness of 0.1 to 0.4 mm. However, if the thickness is less than 0.1 mm, the surface plate itself is bent and broken due to an externally applied impact. In the case of exceeding 0.4 mm, the manufacturing cost saving effect is relatively reduced.

  On the other hand, the adhesive resin is formed to a thickness of 0.02 to 0.1 mm. However, when the thickness is less than 0.02 mm, there is a problem that sound absorption, vibration damping, and heat insulation are deteriorated. If it exceeds the upper limit, the adhesive resin layer cannot maintain a uniform viscosity in the thickness direction.

  More preferably, a corrosion prevention coating layer can be further formed on the lower surface of the support plate. Unlike the surface plate material, the support plate material uses a relatively cheap general steel plate, so internal corrosion can occur during long-term use, so a corrosion prevention coating layer is further formed on the lower surface of the support plate material It is.

1. In order to test the vibration damping characteristics of the bonded steel sheets, the inventor applied the bonded steel sheet samples and vibrated the samples with an impact vibration apparatus, and obtained the frequency response function curves shown in FIGS. From the frequency response function curve, the first, second, and third order natural frequencies and the loss coefficient at each natural frequency were obtained by the inverse width method. During the test, measurement values were obtained through three tests for each sample in order to reduce measurement errors. The samples used were a single STS steel plate (see FIG. 3), an STS bonded steel plate (see FIG. 4), a single Cu steel plate (see FIG. 5), a Cu bonded steel plate (see FIG. 6), and a single Al steel plate (FIG. 7). Reference), Al-bonded steel sheet (see FIG. 8), and the thickness of all the samples is 0.8 mm.

  The bonded steel sheet according to the present invention is a concept including a bonded steel sheet obtained by bonding different kinds of steel sheets, but a bonded steel sheet obtained by bonding the same type of steel sheets so that the vibration damping characteristics of the bonded steel sheets can be easily compared is used as a sample. Selected.

  As can be seen from Table 2, the bonded steel sheet according to the present invention exhibits excellent vibration damping performance, particularly in the middle and high frequency regions, when viewed from a single material steel sheet.

2. Chemical Resistance Test The present inventor has immersed the STS bonded steel sheet according to the present invention in 10% nitric acid, 40% sodium hydroxide, and 20% sodium carbonate maintained at 25 ° C. for 48 hours to determine whether or not the test piece is peeled off. Observed with a microscope.

  FIG. 9 is an electron microscopic observation photograph by the above test, FIG. 9a is a photograph when immersed in 10% nitric acid, FIG. 9b is a photograph when immersed in 40% sodium hydroxide, and FIG. 9c is 20%. It is a photograph at the time of being immersed in sodium carbonate. As can be seen from the photograph of FIG. 9, it can be seen that no peeling or corrosion occurred even after immersion.

  As described above, the above-described embodiment has been described with respect to the most preferable example of the present invention. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention. It will be apparent to those skilled in the art that variations are possible.

11: Surface plate material 12: Support plate material 13: Adhesive resin

Claims (5)

In bonded steel plates with excellent vibration damping, sound absorption, heat insulation and workability,
Surface plate material,
A support plate that is disposed so as to face the surface plate and supports the surface plate; and an adhesive resin layer that is disposed between the surface plate and the support plate and interconnects the surface plate and the support plate. And consist of
The bonded steel sheet, wherein the adhesive resin layer has a thickness of 0.02 to 0.1 mm and a viscosity of 2500 to 4500 cps.   The bonded steel plate according to claim 1, wherein the surface plate member and the support plate member have a bending rigidity of 10.5 to 16.5 Nm.   The bonded steel plate according to claim 1, wherein the surface plate has a thickness of 0.1 to 0.5 mm, and the support plate has a thickness of 0.5 to 1.9 mm.   The surface plate material is any one selected from stainless steel, aluminum, and copper excellent in surface treatment and surface workability, and the support plate material is a galvanized steel plate, stainless steel, aluminum, a color steel plate, a cold-rolled steel plate, and a pickled steel plate. The bonded steel sheet according to claim 1, wherein the steel sheet is any one selected from steel sheets.   The bonded steel sheet according to claim 1, further comprising a corrosion prevention coating layer formed on a lower surface of the support plate material.

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