JPS59124847A - Composite type vibration-damping laminate - 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 The present invention relates to a composite vibration damping laminate, and more particularly to a composite vibration damping laminate comprising a viscoelastic polymeric material layer and a metal layer, which has a damping performance against metals. .

In recent years, noise from industrial machines and structures, as well as automobiles, which are essential to social life, has come into focus as a social problem, and as a result, various noise prevention measures have been required.

As a conventional specific noise prevention measure, many methods have been taken in which materials having different functions such as insulation, sound absorption, vibration isolation, and vibration distribution materials are used in combination.

Meanwhile, in the automobile industry, in addition to noise prevention measures, weight reduction is being promoted in order to cope with fuel efficiency regulations and energy supply issues that are becoming increasingly strict due to the trends of the times. Examples include thinning steel plates for panels, or introducing aluminum alloys and plastic materials as substitutes for steel materials. On the other hand, as automobiles become lighter, the vibrations of the automobile itself tend to become more intense, leading to an increase in noise.

Therefore, an important issue for the future is how to reduce the lifting motion.

As part of these vibration prevention measures, recently there have been methods using vibration-proof alloys, methods of laminating vibration-damping materials to metals, and composite vibration-damping materials in which a viscoelastic polymer substance is sandwiched between metals. Methods for using this have been developed and are beginning to be adopted in a wide range of fields.

In general, the loss coefficient (η), logarithmic damping ratio (c), resonance sharpness (Q>, etc.) are used as measures of the vibration damping effect of damping materials such as distributed steel plates, and these are interrelated. These are physical property values. Among these physical property values, loss coefficient (η
) is the most commonly used material, and conventionally it was said that if η is 0.05 or more, the damping effect is large, but with the recent tightening of noise regulations, the development of vibration damping materials with a larger (2η) is expected. has been done.

The purpose of the present invention is to further improve the loss coefficient (η) in accordance with the above-mentioned trends of the times.
The purpose of the present invention is to provide an allocating material that is large in size and has excellent workability.

The gist of the present invention is as follows.

That is, in a composite vibration damping laminate comprising a viscoelastic polymer mixture and a metal fly layer that have an allocating performance to metal, the viscoelastic polymer material is polyvinyl acetal resin and/or carboxyl/silica. The present invention is a composite vibration damping laminate characterized in that it is a material containing a polyvinyl acetal resin containing groups as a component.

In general, composite vibration damping materials have a polymer substance sandwiched between metals such as steel plates, so η changes depending on the operating temperature, and η has the property of reaching a peak at a certain temperature. . Therefore, it is necessary to select a viscoelastic polymer material that is suitable for the intended use temperature, but according to the inventors' 101 research, plasticizers and additives (2) can be used to change the temperature at which the loss coefficient (η) value is maximum. It has been confirmed that this is possible.However, it goes without saying that the smaller the temperature dependence, the better the allocation material.

Viscoelastic polymer materials, which are generally used to improve the vibration distribution properties of laminates such as composite damping laminate plow plates, have a loss tangent (tan
δ) is considered to be better.

Another embodiment of the composite damping m1 layer is a non-restrictive damping laminate. This is a laminate in which a viscoelastic polymer material with excellent vibration damping performance is laminated to a metal such as a copper plate to exist as a free layer, and the viscoelastic polymer material generally has a high complex modulus (E It is said that things are good. Recently, constrained vibration damping laminates that contain less resin and have excellent damping properties have been attracting attention. The present invention also relates to this constrained vibration damping laminate, the details of which will be explained below.

As a result of repeated comparative tests on many viscoelastic polymer materials, the present inventors found that polyvinyl acecool resin is effective for the purpose of the present invention, and polyvinyl butyral resin is particularly effective.

It is well known that this polyvinyl butyral resin is widely used as an interlayer film for windshield glass in automobiles, aircraft, etc., and it is well known that a viscoelastic polymer mixture containing this polyvinyl butyral resin as a main component can be used to coat glass. The present invention not only improves adhesion to metals such as steel plates, but also the loss coefficient (η) mentioned above, because the peak of temperature dependence can be changed over a wide temperature range from room temperature to high temperature. was found to be one of the most suitable substances for this purpose.

The polyvinyl acetal resin used in the present invention is produced from vinyl acetate, aldehyde, etc. Generally, vinyl acetate monomer is polymerized to produce polyvinyl acetate resin,
Next, it is produced by reacting the polyvinyl alcohol obtained by saponification with an aldehyde. That is, the polyvinyl acetal resin component is a copolymer resin having vinyl acecool groups, vinyl alcohol groups, and vinyl acetate groups, and the reaction product of this resin with formaldehyde is called formal resin, and the reaction product with butyraldehyde is called formal resin. It is called butyral resin.

The average degree of polymerization of the butyral resin used in the present invention is 5
The range of 00 to 3000 is suitable, and the higher the degree of polymerization, the more suitable it is. In addition, the petitralization degree is 50~gQ
It is preferable that it is about 100%.

As described above, it has been found that polyvinyl acetal resin is effective as the viscoelastic polymer material forming the distributed laminate according to the present invention, and polyvinyl butyral resin is particularly effective. It has been found that those containing groups are similarly effective.

As the polyvinyl acetal resin containing a carboxyl group, for example, a copolymer of vinyl acetate and an unsaturated carboxylic acid is used to produce wrinkled vinyl acetal resin by a conventional method, or polyvinyl alcohol is acetalized. It is obtained by reacting with an aldehyde containing a carboxyl group during the reaction. Therefore, for the purpose of the present invention, either polyvinyl acetal resin or polyvinyl acetal resin containing a carboxyl group may be used alone,
Or it turned out that Gokon Senjuki Master Toru can be used at the same time.

As described above, although the viscoelastic polymeric substance used as the distributed laminate according to the present invention is mainly composed of the above-mentioned polyvinyl acetal resin and/or polyvinyl acetal resin containing a carboxyl group, these resins can be used in the laminate. in the temperature range.

We will explain plasticizers added to adjust the temperature range in which the maximum loss coefficient (η) can be obtained, and fillers that are effective in improving physical properties such as increasing the loss coefficient (η) and improving the elastic modulus. .

Examples of aJ plastics include phthalic acid esters such as dibutyl phthalate and dioctyl phthalate, phosphoric acid esters such as tricresyl phosphate, dibutyl sebacate,
Glycol derivatives such as glycol derivatives such as glycol esters such as glutinyl succinate and triethylene glycol digtylate are commonly used, and in the present invention, any one of these may be selected. I can do it. The role of the plasticizer is as described above, but in general, when the amount of plasticizer added increases, the maximum value of the loss coefficient (η9) shifts to a lower temperature range.

Next, the effects of adding fillers are as described above, but preferred fillers for achieving the purpose of the present invention include scaly graphite, mica, conductive carbon black, carbon graphite,
Examples include talc and magnesium carbonate.

Next, the gold FA used in the laminate according to the present invention will be explained. As the metal plate used in the present invention, a flat steel plate is most suitable in terms of adhesion to the viscoelastic polymer substance used as the intervening body, strength, price, etc., but other metal plates can also be used.

Steel plates include mild steel plates, high-tensile steel plates, stainless steel plates,
Surface-treated steel sheets such as galvanized steel sheets, or steel sheets that have been surface-treated by methods commonly used for preliminary treatment of metal surfaces, such as phosphate or chromate treatment, can also be used depending on the purpose of use. The surface of these steel plates should be clean in order to obtain the best adhesion with the viscoelastic polymeric substance, and for this purpose, sand gellast treatment or the like may be necessary in some cases.

These steel plates may be used as flat plates, but they may also be subjected to bending or drawing depending on the shape of the desired laminate. In addition, the steel plates used as the distributed laminate are heated during the manufacturing process, so if a steel plate that ages easily is used, an optical surface distortion pattern called a stretcher strain will occur during processing, impairing the appearance. If the later appearance is important, set the aging index (A, I, ) to 1.
Non-aging steel plates of 5 Kpf/- or less should be used.

Note that the shape, thickness, etc. of the steel plate are not particularly limited, and any appropriate one may be used depending on the shape, dimensions, etc. of the distributed laminate to be manufactured.

Example 6 An ordinary cold-rolled steel plate measuring 0.6 x 250 mm x 250 mm was degreased by trickling and used as a metal substrate for a laminate according to the present invention.

Next, two polyvinyl butyral resin sheets with a thickness of about 0.1 mm were prepared, and after washing off the anti-adhesion agent present on the surface with demineralized water, they were dried at 60° C. for 3 hours.

This resin sheet was sandwiched between the above two steel plates, preheated and defoamed at a temperature of 170°C for 3 minutes using a hot press machine, and then crimped under heat and pressure for another 3 minutes to achieve a plate thickness of 1.3 mm. A composite damping laminate A1 was obtained. In order to measure the temperature dependence of the loss coefficient η of the thus obtained distributed laminate, the sample was placed in a thermostatic chamber and the temperature of each ridge was set, and the frequency was changed to adjust the temperature from the resonance point of the mechanical impedance. The results of determining the loss coefficient are shown by the curve in FIG.

On the other hand, for comparison, the same steel plate was used and a conventionally known resin mainly composed of polyethylene resin was used, and a plate thickness of 1.3 mm was made using the same method as the composite vibration damping laminate according to the present invention.
Carcass sample material A2 was obtained. The temperature dependence of the loss coefficient η of this comparison sample laminate A2 was measured by the same method as described above, and as a result, Bll)lIIM shown at the same time in FIG. 1 was obtained.

As is clear from FIG. 1, in the laminate A1 according to the present invention, as shown by the curve, the temperature range in which the loss coefficient η is 0.1 or more is extremely wide, reaching 35°C, and at the peak of 60°C, the loss coefficient η A high value of 0.5 was obtained.

On the other hand, as shown in the 8-curve Φ, for the comparative material Laminated Resistance 2, the temperature range in which the loss coefficient η is 0.1 or more is only slightly below 20°C, and even at its peak of 90°C, it is 0.18. This shows an extremely low value.

As is clear from the above examples, the composite vibration damping laminate according to the present invention has a metal layer such as a steel plate, and a viscoelastic polymer material layer sandwiched between the metal layer and a polyvinyl acetal resin or a carboxy group. The main component is a material containing one or both of the polyvinyl acetal resins, and if necessary, a plasticizer and a filler are added individually or simultaneously, so the following effects can be achieved. I was able to do that.

(a) The viscoelastic polymeric substance according to the present invention has extremely good adhesion to metals such as copper plates, and it is easy to manufacture a laminate with the entire area by heating and pressurizing.

(b) The composite vibration damping laminate according to the present invention has an excellent damping function, has an extremely wide temperature range in which the loss coefficient η is 0.1 or more, has a high maximum value, and is highly adaptable to the addition of plasticizers and fillers. It is possible to change the maximum value of temperature dependence over a wide temperature range from room temperature to high temperature.

e) The composite vibration damping laminate according to the present invention has excellent workability and is easy to bend and draw, so it can be used for an extremely wide range of applications depending on the metal used.

[Brief explanation of the drawing]

FIG. 1 is a diagram comparing the temperature dependence of the loss coefficient η in an embodiment of the composite damping laminate according to the present invention with that in a conventional damping laminate. Agent Patent Attorney Takeo Nakamichi Procedural Amendment February 7, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi1, Indication of Case 1982 Patent Application No. 2282772, Title of Invention Composite Damping Laminate 3, Relationship with the case of the person making the amendment Patent applicant address 1-28 Kitahonmachi-dori, Chuo-ku, Kobe, Hyogo Prefecture Name (125) Kawasaki Steel Corporation Representative Hiroshi Yagi (and one other person) 4, Agent Person〒1
87 Detailed description of the invention in the specification a. 8. Contents of the amendment (1) On page 5, lines 10 to 11 of the specification, "The present invention also relates to this constrained vibration damping laminate, the details of which will be explained below." has been deleted. I will explain the details.”
Add. (2) Detail 1: Delete “Buildings 1-2” in the 10th negative 15th line. that's all

Claims (5)

[Claims] (1) In a composite vibration-damping laminate comprising a layer of a viscoelastic polymeric material that has an allocating performance to metal and a metal 16, the viscoelastic polymeric material is a polyvinyl acecool resin and/or a carboxyl group. A carcass with a composite vibration damping fl' characterized by being a substance containing polyvinyl acecool resin containing as a component. (2) The composite damping laminate according to claim 1, wherein the metal is a steel plate. (3) A composite vibration damping laminate according to claim 1 (.gamma), wherein the polyvinyl acecool resin is a polyvinyl butyral resin. (4) The composite damping laminate has a metal layer on the outside and a resin layer containing polyvinyl acecool resin on the inside, or a mutually interposed body of the resin layer and the metal layer.
The composite vibration damping laminate according to any one of Items 1, 2, and 3. (5) The composite damping laminate according to claim 2, wherein the steel plate is a non-aging steel plate having an aging index of 1.5W4f/- or less.