JPH04152133A - Preparation of damping material - Google Patents

Abstract

PURPOSE:To prepare a damping material having good damping properties, high adhesiveness and high processability by partially performing bonding and welding using ultrasonic vibration or electromagnetic induction heating. CONSTITUTION:A thermoplastic resin film is formed to the superposing surfaces of materials and uneven parts are formed to the thermoplastic resin films. The bonding surfaces are bonded under pressure by an ultrasonic generator equipped with an ultrasonic transmitting surface having a non-smooth surface or an electromagnetic induction heating apparatus to partially form bonded and welded parts by ultrasonic vibration or electromagnetic induction heating. As mentioned above, by forming the thermoplastic resin films to the superposing surfaces of the materials, the bonding surfaces are welded by ultrasonic vibration or electromagnetic induction heating and the resin layer can be formed between the materials and vibration is buffered to obtain damping/sound arresting effect. Further, by partially forming the welded surfaces, non-welded surfaces develops buffer action to vibration or sound with respect to the welded surface to synergistically obtain damping/sound arresting effect still more.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a simple and efficient composite restraint type vibration damping material that has good vibration damping and noise damping properties, high adhesive properties, and high processability. The present invention relates to a method for manufacturing the method.

(Prior Art) Noise and vibration generated from automobiles, home appliances, industrial machinery, building materials, etc. have an impact on society, and various studies are being conducted as soundproofing and vibration countermeasures.

Attempts are being made to create a composite type of allocation material that combines a polymer material and a metal, taking advantage of the high vibration damping performance of polymers, as well as a constrained type of allocation material that uses a sandwich of polymer materials.

For example, JP-A-59-57743 and JP-A-60
, No. 82349 discloses a vibration-damping composite steel plate for thermoplastic resin (press) processing, which has a synthetic resin layer having vibration damping performance in the center layer.

(Problems to be Solved by the Invention) However, JP-A No. 59-57743 does not specifically describe the joining method, and in JP-A No. 60-82349, the damping layer is a film, and the damping layer is formed between steel plates. This method requires a large-scale production line, and cannot be applied to highly processed items, and the vibration damping effect is not at a satisfactory level. .

(Means for Solving the Problems) The present inventor has achieved a control system with good vibration distribution properties, high adhesion properties, and high workability by partially bonding and fusing using ultrasonic vibration or electromagnetic induction heating. We have discovered a method for manufacturing wafer materials.

The present invention is a method for producing a vibration damping material that involves the following steps.

Step of forming a thermoplastic resin coating on the overlapping surface of the FA+ material (B) Step of forming uneven parts on the surface of the thermoplastic resin coating fc) The bonding surface is a combination of the following (a) or (b). Joining process f7) fA) Process coating surface and (B) Process coating surface [1f
B) Process coating surface and fB) Process coating surface (D+ bonding surface,
(By an ultrasonic generator equipped with an ultrasonic transmission horn consisting of a non-smooth surface, or (by an electromagnetic induction heating device, the bonding surface is partially formed by ultrasonic vibration or electromagnetic induction heating while applying pressure.) The present invention will be described in detail below.

Materials used in the present invention include cold rolled steel plate, zinc (alloy)
Plated steel sheet, aluminum (alloy) sheet steel (plated) sheet,
Metal materials such as brass plates and stainless steel plates, FRP, polyethylene, and polypropylene.

Plastic materials such as ethylene-vinyl acetate copolymer, polyamide, polyacrylic, polyester 1-ethylene-polyvinyl alcohol copolymer, vinyl chloride resin, vinylidene chloride resin, polycarbonate, polyurethane, glass, paper, wood, cloth, M door items , ceramics such as tiles, inorganic materials such as cement, concrete, etc. can be used. When the material is metal, it may be chemically treated, degreased, or the surface may be mechanically treated. In the case of nonmetals, chemical conversion treatment is not necessary, but methods such as degreasing, mechanical treatment, and discharge treatment may be performed.

Note that if the joining and fusing method is electromagnetic induction heating, the material must be a conductor, and non-conductive materials must be treated to become conductive, such as by applying conductive paint, before being fused. .

The process of the present invention (A+ is the process of forming a thermoplastic resin coating on the material. Usually, after forming the thermoplastic resin coating,
However, the coating film forming step and the fusing step may be a continuous step.

The thermoplastic resin coating formed on the material according to the present invention is used on the overlapping surfaces. Resins for thermoplastic resin paints that can be used include chlorinated olefin resins such as chlorinated polyethylene and chlorinated polypropylene, which are commonly used in the paint field, vinyl chloride resins, vinyl acetate, vinylidene chloride, and copolymers of these. vinyl resin, cellulose resin.

Examples include acetal resin, alkyd resin, and chlorinated rubber resin. The dry film thickness is 1/1 to 1/6 on the mutually overlapping sides, and 50 to 300 on one side.
μm is preferred.

Furthermore, in the present invention, plastisols and organosols of vinyl chloride resin dispersions are also conveniently used.
000) / Vinyl chloride resin for blending (average degree of polymerization P
=400~1500) =10010~50/5
0 weight ratio as the main component, and 100 parts by weight of this main component as plasticizers such as phthalate esters, linear dibasic acid esters, trimellitate esters, high molecular polyesters, and epoxidized soybean oils. 20 to 90 parts by weight of a stabilizer, and 2 to 10 parts by weight of a lead salt type, metal soap type, epoxy type, organic tin type, organic phosphorous acid compound, etc. alone or in combination as a stabilizer. Can be mentioned. The amount of vinyl chloride resin in the coating film is 55% by weight or more.

The paint used for the coating film forming the overlapping surfaces of the present invention can be used as both a clear paint and a colored paint, so any pigment may be used, but if used, the pigment may be one commonly used for paints. Inorganic pigments such as , titanium oxide, carbon black, yellow iron oxide Bengara, and organic pigments such as phthalosyanine blue, phthaloshanine green, and quinacridone red can be used.

In the present invention, the paint used to form the coating film on the outer surface of the distributed material may be the same thermoplastic resin as the paint used on the overlapping surface, or the thermosetting resin paint used as the pre-coat paint. may also be used. Dry film thickness: 8~
The thickness is 200 μm, preferably in the range of 10 to 100 μm. 10 to 20 μm if the material is pre-coated steel plate, 20 to 50 μm if the material is post-coated steel plate, and 20 μm if the material is plastic material.
~50 μm, preferably 10 to 20 μm for paper.

Examples of thermosetting resins used in such paints include film-forming resins such as acrylic resins, polyester resins, alkyd resins, and incyanate-curing acrylic resins, which may be used as needed. , used together with crosslinking agents such as amino resins and blocked isocyanates.

The resin may contain 30% by weight of oil or fatty acid as necessary.
In addition, it can also be used as an alkyd resin with added flexibility.

In the present invention, not only organic solvent-soluble resins but also water-soluble,
Water-based paints made of water-dispersible or emulsified resins can be used.

The paint used to form the paint film on the outer surface is a distribution material, and the outer visible side (the front side of the non-overlapping surface) can be used singly or in combination in terms of corrosion resistance and design. A method is used in which colored paint or clear paint is applied over colored paint. The surface on the back side of the non-overlapping surface may be the same as the front surface, and there is no particular need for design.
A primer with corrosion resistance may be sufficient. Formation of the coating film on the outer surface can be arbitrarily selected in the process of the present invention. Various additives can be blended into the paint, and the various additives that can be blended include:
Addition of curing catalysts such as dodecylbenzenesulfonic acid, ultraviolet absorbers such as benzophenol, antioxidants such as phenol and sulfide, surface conditioners such as silicone and organic polymers, anti-sagging agents, thickeners, etc. These agents can be included in the paint in an amount of 5 parts by weight or less,
Paint performance and film performance can be improved.

However, if the amount of these compounds is too large, repellency may occur during coating film formation or interlayer adhesion may deteriorate, which is not preferable.

For mixing each component of both the paints used to form coatings on the overlapping and non-overlapping surfaces, equipment such as paint shaker dissolvers, ball mills, sand grind mills, kneaders, etc. that are commonly used in paint manufacturing are used. Use.

The coating methods for these paints are not particularly limited, and include ordinary coating methods such as air spray coating, airless coating, static 1i coating, and in particular, gravure coating methods that are excellent in coating thickness accuracy, coating surface smoothness, etc. Roll coating methods, curtain coating methods, bar coating methods, offset gravure coating methods, etc. are also adopted.

In step FB) of the present invention, irregularities are formed on the thermoplastic resin coating surface that has already been formed on the overlapping surfaces using Al. When fusing by heating, if the thermoplastic resin coating surface on the joint surface is smooth, the bonding will be insufficient and the vibration distribution/silencing effect will not be achieved. to form uneven parts.

As a method for forming the uneven portions, a transfer method using an embossing roll, a method of dispersing aggregate, etc. are used. A preferred method is a transfer method using an embossing roll. Even if the paint film is made to wrinkle in advance by using a paint with a shrinking composition or a paint containing aggregate, it is possible to create uneven surfaces without adding unevenness in step + B). The uneven portions preferably have a height of 1 OLLra or more, less than half the dry film thickness of the thermoplastic resin coating, and are desirably applied as uniformly as possible.

The process of the present invention (C1 is the joining process of the overlapping surfaces. When there are two materials, they are joined using the following combinations of (A) or (A). When there are three or more materials, each joining surface is (A). ) and/or (bonding is performed by a combination of advantages. For bonding, the bonding surfaces are overlapped for ultrasonic vibration or electromagnetic induction heating in the next step FD+.

In the step (D) of the present invention, the joint surfaces formed by the combination in the FC+ step are fused. The thermoplastic resin coating surface is shown below (
There are two methods of fusion: a) or b).

The temperature for bonding and fusing may be at least the temperature necessary for fusing the thermoplastic resin coating, for example, 150 to 300°C.
A range of is preferred.

(b) Apply ultrasonic vibration while pressurizing the ultrasonic transmission horn provided at the tip of the ultrasonic generator. The thermoplastic resin coatings can be fused together by the frictional heat generation effect generated by the ultrasonic vibrations.

In the fusion method using ultrasonic vibration in the present invention, (1) the coating contact surface of the ultrasonic transmission horn is non-smooth, and (2) the fusion surface is partial.

The shape of the transmission horn is round, square, etc., and the dimensions are round with a diameter of 5 to 20 mm, square with a width of 2 to 20 m, and a length of 2 to 20 mm.
mm, and the contact surface preferably has a lattice-type, striped-type, or concentric-circular configuration with jagged edges and a roughness of 100 to 1000 μm. By making it non-smooth, the contact surface increases and the adhesive strength increases.

The distribution effect can be further enhanced by making the fusion surface partial rather than the entire surface.

By "partially", it is preferable that the distance between the fused parts where the ultrasonic transmission horn contacts and fused the parts is 5 to 100 mm.

Partially means that the effect can be exerted without the above-mentioned spacing as long as it is not the entire surface.

The ultrasonic vibration in the present invention is preferably 5-50 KHz and vibration time 0.2-60 seconds, and pressurization increases the fusion effect, but the pressurization conditions are 1-5 kg/0 m2
Do it with

(b) The electromagnetic induction heating method uses the fact that when a conductor is placed in a high-frequency magnetic field, it generates heat in an extremely short time due to Joule heat caused by hysteresis loss and a decaying current. Thermoplastic resin coatings formed on can be fused.

The fusion method using electromagnetic induction heating in the present invention includes a flj high-frequency oscillator, (2) a pressure press, (3) a heating coil, and (4)
) Consists of a heating element and a pedestal made of non-metallic material such as Bakelite or silicone.

As a high frequency oscillator, output 2~50KW, frequency 50
KH2 to 3MH2 and oscillation time 2 to 60 seconds are preferable.

If the damping material of the present invention requires processing such as bending or pressing, it may be processed before or after the manufacturing process of the vibration damping material of the present invention. From the point of view of economy and efficiency, post-processing is preferable. As in the case of ultrasonic vibration, also in the case of electromagnetic induction heating, it is necessary that the fusion surface is not all over, but only partially.

(Function) In the present invention, by forming a thermoplastic resin coating film on the overlapping surfaces of materials, the joining surfaces are fused by ultrasonic vibration or TGA induction heating, and a resin layer is formed between the materials. By damping vibrations, vibration damping and noise damping effects can be obtained. Furthermore, by partially forming the fused surface, the non-fused surface has a buffering effect against vibration and sound relative to the fused surface, so that synergistically further vibration distribution and noise reduction effects can be obtained.

(Examples) Hereinafter, the present invention will be explained in more detail based on Examples, but it goes without saying that the technical scope of the present invention is not limited to these Examples.

Back side 11 pull ↓ After surface conditioning on both sides (NP conditioner 200/manufactured by Nippon Paint), chromate conversion treatment (Surf coat N
RC300/manufactured by Nippon Paint ■), and applied the inner surface paint shown in Table 1 to the mating surfaces with a dry film thickness (hereinafter referred to as film thickness) of loo.
Two hot-dip galvanized steel plates were coated with um and dried, and both outer surfaces were coated with paint T-1. A convex portion having an embossing depth of approximately 50 μm was formed on each of the overlapping surfaces of the two sheets using an embossing roll. Ultrasonic fusion device (
Using SONOPET1200B / Seidensha Electronics Industry ■), frequency 19.15KH2, time 07 seconds, pressurization 1
．． Fusion was carried out under the condition of 5 kg/c+n2.

The tip shape of the ultrasonic transmission horn at this time is 10 mm in diameter.
A lattice-shaped contact surface with a round shape and a roughness of 700 μm was used. Partial fusion was performed with a spacing between the fusion surfaces of 100 mm at the narrowest point. Then allocability.

Sound deadening properties and adhesion properties were evaluated, and further deep drawing was performed to evaluate workability. The results are shown in Table 2.

The combinations shown in Table 2 were carried out based on the L1 beard presentation example, and the results are shown in Table 2.
It was shown to. For the tM3 induction heating, a 'r4 magnetic induction wafer (VH-10/manufactured by Seidensha Electronics Co., Ltd.) was used.

An example in which no convex portions were formed on the overlapping surfaces of Gotonu Example 1 (Comparative Example 1), and an example in which the entire surface was fused using a heating roll (
Comparative Example 2) and an example in which the contact surface of the ultrasonic transmission horn was made smooth [Comparative Example 3] were conducted under the same conditions as in Example 1, and the results are shown in Table 2.

FT dry film thickness evaluation method and evaluation criteria 1. Using the damped resonance method, the FFT analyzer device (model 2032
/manufactured by P & K Co., Ltd.), width 20 mm.

Find the resonance point of a strip-shaped test piece with a length of 200 mm at 40°C by changing the frequency, and calculate the loss coefficient η from the ratio of the bandwidth = f xfl and the resonance frequency fn at a point 3 db lower than the peak (half-value point). I asked for

η” (f--f+)/fn 2.

After sound-dampening welding, a 300mm x 3QOmm board was cut out, the upper two parts were suspended by threads, the test piece was hit with a plastic hammer, and the sound reverberation was evaluated using the following evaluation criteria.

○...No reverberation △・・・There is some reverberation X: Lots of reverberation 3.

The tensile strength was measured using adhesive Tensilon (Model 5S-207D-UA/manufactured by Toyo Baldwin) at 20 mm/min and 20°C, and the strength when the thermoplastic resin coating of the material was peeled off was measured.

(Unit: kg/cff12) 4. Workability The test piece after fusion is deep drawn using a cylindrical deep drawing tester (
Bl-142 type/manufactured by Koriksen Co., Ltd.) with a wrinkle presser pressure of 3 tons, punch diameter of 50 mmφ, and die diameter of 52.4 mm.
φ, drawing depth 40mm, blank diameter 95mm,
For bending (L-shape) processing, an eccentric press (OEP-15) is used.
(manufactured by Seiko Sheet Metal Co., Ltd.) into an L shape, and the peeling, misalignment, discoloration, etc. of the coating film were examined.

○... No abnormalities △... Misalignment, distortion ×... Peeling (effects of the invention) The distributed material of the present invention does not distinguish between plate-shaped and pre-processed materials (partially bonded and fused). It has become possible to produce a vibration damping material that is easy to apply, has good vibration damping properties, sound deadening properties, high adhesion properties, and high processability.

The distribution material of the present invention having such characteristics can be suitably used in fields where vibration and noise countermeasures are required, such as home appliances, automobiles, industrial machinery, and building materials.

Patent questioner: Nippon Paint Co., Ltd.

Claims (1)

[Claims] 1. A method for producing a vibration damping material characterized by passing through the following steps (A) Step of forming a thermoplastic resin coating on the overlapping surfaces of the materials (B) Step of forming the thermoplastic resin coating Step (C) of forming irregularities on the film surface (C) Step of joining the joint surfaces in a combination of (A) or (B) below (A) Process coating surface and (B) Process coating surface (I) )(B
) process coating surface and (B) process coating surface (D) bonding surface by (a) an ultrasonic generator equipped with an ultrasonic transmission horn consisting of a non-smooth surface, or (b) an electromagnetic induction heating device. , a process of partially forming the bonding surface by ultrasonic vibration or electromagnetic induction heating while applying pressure.