JPS60245550A - Vibration-damping metallic plate - 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 Field of Application of the i+rt Industry The present invention involves sandwiching an intermediate layer mainly composed of acrylonitrile-butadiene copolymer rubber and a heat-curable epoxy resin between two metal plates. It is a vibration-damping metal plate that has poor workability after heating and hardening the middle layer of the body.
A vibration-damping metal plate with a loose vibration-damping property that reduces the noise of vibrating parts that generate heat in various types of equipment such as automobiles, railways, and aviation vehicles, office equipment, electrical products, and metal processing machine accommodation. be.

Prior Art In recent years, vehicles such as automobiles, trains, and aircraft, as well as office equipment,
With the generalization of electrical products, noise countermeasures for these devices have become an urgent issue. In particular, there is a strong desire to reduce noise from vibrating members that generate heat, such as parts around automobiles (oil pans, engine covers, etc.), home appliances, and even metal processing machines.

When conventional vibration damping metal plates are evaluated to meet the demands of the market, there are various disadvantages such as the following:
As a result, the scope of application is extremely limited, and currently only one person is eligible.

One of its biggest drawbacks is that the intermediate layer materials used in commercially available damping metal plates are mostly thermoplastic self-decapitating agents, so they cannot withstand shocks near room temperature. Due to mechanical stress, the intermediate layer material may crack, and its adhesion to metals is extremely poor. Therefore, since 9'l Fi[ is generated between the metal plate and the metal plate, press forming involving stretching, bending, drawing, etc., becomes extremely difficult. In other words, it is difficult to apply it to automobile parts, office equipment, metal processing machines, etc., which are most in demand and require complicated press formability.

In addition, even with very simple press-formed parts, intermediate layer materials may flow out during the coating process or drying process, decomposition and carbonization may occur, or even creep under static stress at actual operating temperatures. 1' of the metal plate may occur.
There are many problems in practical use, such as lm.

In addition, from the point of view of spot weldability, the intermediate layer in conventional vibration-damping metal plates is simply made of polymeric organic material and has no electrical conductivity. Another problem is that it is difficult to use.

Purpose of the Invention In view of the current state of conventional vibration-damping metal plates, the present inventors have carried out intensive research, and as a result have achieved the following: succeeded in. That is, the vibration-damping metal plate of the present invention is made by sandwiching an intermediate layer mainly composed of acrylic trilouptagie/kyoyama composite rubber and a heat-curable boxy resin between two metal plates. This vibration-damping metal plate is made by heating and hardening the material, and not only does it exhibit excellent vibration damping ability over a wide temperature range, but it also has better contact between the metal and the intermediate layer than conventional vibration-damping metal plates. I tll move forward rapidly and move extremely slowly.
After machining f1, it is a wide product i.
The purpose of this invention is to provide a vibration-damping metal plate that can be applied to FF.

Structure of the Invention The metal plate used in the present invention may be made of iron, copper, aluminum Uno 2, JLLJ lead, etc., or various alloys, or a combination of the same or different types.

Acrylonitrile-butadiene Jl used in the present invention
; For tTi combination, acrylic "1 nitrile containing 1 amount or 15
~50%, preferably 25-40%. Yes
This, furthermore, the terminal or ], the cal 71″ xy group at the 5th point,
Amino, (, hydroxyl), l or similar
Those having a functional group are also preferably used. Further, there are no limitations on the molecule il: (from the low molecule i& fall to the i;'; i molecule Go1.

In addition, heat-curing type 4. Examples of resins include diglycidyl ethers of polyhydric phenols such as bissoanol; diglycidyl ethers of polyhydric alcohols such as glycerin or propylene glycol; Typical examples include glycidyl co-tyl, a 7-borase type phenolic resin derived from esters such as esters; or), nor or cresols.

Further, as curing agents added as auxiliary agents, aromatic polyamide/, urea-melamine formal/synthesize, aliphatic acid and its acid anhydride, alicyclic acid and its acid anhydride, aromatic acid and its acid anhydride, etc. Acid anhydride, 1-gene acid and its acid hydrate, dicyanodiamide and its acidity 1
Typical examples include (1), nol and its derivatives, (1), isonoalate and its derivatives, imidazole and its derivatives, and the tQ form. The thickness of such an intermediate layer composition is between 0.0 and 1.0 vI.
IS is preferably used after adjusting J12 to 0.05 to 0.5 ++IN.

In order to obtain a damping metal plate with excellent post-processability, it is essential that the adhesion between the front and back metal plates and the intermediate layer be strong. The present invention is based on the eighth line. In other words, heat-curing mold work, J! 7 Resin is widely used as a contact agent with metals, but it is never overlooked that this resin has a relatively high vibration damping ability.
The present invention uses such a resin as one of the main components of the intermediate layer of a vibration-damping metal plate.

However, heat-curable epoxy resin η1 has a maximum value of vibration damping ability on the extremely high temperature side and is hard and brittle, so it has poor performance and post-processing.

Therefore, the object of the present invention can be achieved by mixing a heat-curable epoxy resin with a, nitrile-butadico/copolymer 2fm. amount and acrylic "J nitrile-butadiene copolymer go 1120~200 ff
If the amount of acrylonitrile-butadiene copolymer rubber is 200 parts by weight or more, the adhesive strength will decrease, and if the amount is less than 20 parts by weight, vibration will occur. The maximum value of the attenuation effect is 1.
' It is outside the A range, and the cured film itself becomes brittle.
Post-processing becomes difficult.

In addition, acrylic “1 nitrile-tutadiene copolymer gono・
It is possible to expand the effective ty01 degree range of vibration damping ability without reducing post-processability. In other words, damping V in a medium and wide 4 degree range
1 ability can be demonstrated.

Furthermore, the main component 10 is composed of acrylonitrile-butadiene-11,'ML composite rubber and a heat-curable epoxy resin.
The conductivity of iron powder, mill scale, aluminum powder, copper powder, carbon graphite, etc. is t! l
By adding 1 to 50 rfifit portions of Kit, it becomes possible to perform spot fJu well.

The intermediate layer of the damping metal plate of the present invention has anti-corrosion, anti-aging properties,
For purposes such as cost reduction, known and commonly used inorganic and organic fillers can be used within the range applicable to the purpose of the present invention.

Example 1 0 [Epicor] 828J (manufactured by Shell Oil TL; epichlorohydrin bisph, Mer A type epoxy resin)
100 copies 0 “Epicure ■Yen l-201J (i+1
(manufactured by Yuka Shell Epoxy Co., Ltd.; amide/imide latent curing agent) 6 parts 0 "Epicure IBM+-124 (manufactured by Yuka Shell Epoxy Co., Ltd.; 1-inbutyl-2-methylimidazole epoxy curing catalyst) 1 part 0 [Aerosil 972J ([Manufactured by Komoto Aerosil Co., Ltd.;
Hydrophobic silica) 2.5 parts or Nipol 1702J (Nippon Zeon Sugi; carboxyacrylonitrile-butadiene copolymer rubber)
73 parts were mixed uniformly to obtain a composition for an intermediate layer. This composition was adjusted to a thickness of 0.1 m++, and the loss factor (a scale that evaluates vibration damping of 11 cm to 3.1') and adhesive strength were adjusted to 7.
111+ set.

The yarn loss test was performed using the above composition thickness of 0. Imn's in 25. ,, sandwiched between two steel plates with a length of 300 mm and a thickness of 0.81, heated and hardened at 150°C for 130 minutes, and measured the loss coefficient over temperature using the menononic impedance method. It was as shown in the figure.

As shown in Figure 1, the maximum value of the loss coefficient of the damping steel plate consisting of the intermediate layer having the following composition is between 80 and 100, which is suitable for the operating temperature of automobile vibration parts that generate heat, such as oil pans. It matches.

Furthermore, regarding its vibration damping ability, the loss coefficient that is effective in reducing vibration is usually considered to be 0.05 or more, or even if this is taken even more strictly to 0.1 or more, the vibration damping metal plate according to the present invention has a loss coefficient of 50 °C and Il) Not only does it exhibit a vibration damping effect over an extremely wide temperature range, but it also reaches its maximum value of 0.25.

Regarding adhesive strength, η'f breaking adhesive strength is JIS-K-68
50.9 Peeling force is -11 based on ISO 4578
Established. The results were as shown in Table 1.

Regarding adhesive strength, which is a guideline for determining whether post-processability is good or bad, the inventors' previous research has shown that good post-processability (press formability, cutting processability, bending processability) To obtain a shearing force of 50 kB/cJ, preferably 80 kg/ca or more, *q pit adhesive force of 15 kg/25 parts or more, preferably 20 kg/cJ or more.
I am fully aware that having at least 25 m+u is an essential condition.

The shear adhesive strength and 91+1 of conventional damping metal plates, which have problems in post-processability, are below 30 kg/cJ and 15 kg/25, respectively.
While anything below 1111 is extremely low,
Each of those of the damping metal plate according to the present invention is 1eObg
/cJ and a high level of 34 kg/25 am, which was extremely slow.

Table 1 Example 2 Composition of Example 1, Tashir N1pol 1702J
A composition containing 1 molecule of maleic acid added to this for about 2,500 of the 9 molecules was mixed uniformly in a mixer at 70°C for 5 minutes to form an intermediate layer composition. The loss factor and adhesive strength were determined to be 11111. The results were as shown in FIG. 1 and Table 1, respectively.

As shown in FIG. 1, carboxyacrylonitrile-butadiene copolymer rubber modified with maleic acid was extremely effective in increasing vibration damping ability and expanding the temperature range. .

Also, the contact force was extremely distorted even with h6.

Examples 3 to 5 0 “Shrimp: 1-to 152J (manufactured by Shell Oil Company);
] Nornovolac type epoxy resin 100 parts 0 Dine anodiamide 6 parts 0
Three intermediate layer compositions (Examples 3.4 and 5) were obtained by uniformly mixing 109 parts, 54 parts, and 36 parts of l 1702J, and the loss factor and adhesive strength of each were measured. The results were as shown in Figure 2 and Table 2.

As shown in FIG. 2, by selecting the composition ratio of the intermediate layer, it is possible to set the maximum value of the vibration damping ability to an arbitrary temperature.

Table 2 The same composition as in Example 1 was added with 1 part of aluminum powder.
Two compositions were obtained by mixing 0 parts (Example 6) and 10 parts of l Norbon Graffite (Example 7) to form the intermediate layer.

The 11 lj force before and after spot welding was measured for these. The results were as shown in the third display.

Table 3 Spot welding is quasi-synchronous resistance welding 4i! (manufactured by Osaka Transformer Co., Ltd. 7)), two-point spot welding was performed under class A 78 contact conditions between 1.2 thick steel plates. As a result, all of them showed good t811i properties.

In addition, since the adhesive force before the spots 18 was extremely high, it became possible to further widen the intervals between spot welds that were conventionally applied to automobile parts, etc., and it was found that this greatly contributed to improving productivity.

Effects of the Invention The present invention can set the maximum vibration damping ability to any altitude in the temperature range of 60°C to 10°C, and exhibits an extremely high vibration damping ability over a wide temperature range. Its excellent bonding horn enables not only bending and cutting, but also complex press forming that combines stretching, bending, deep drawing, etc., and vibration damping that also has good spot weldability. This made it possible to obtain metal plates.

Therefore, this makes it possible to expand the application to a wide range of products such as not only automobile parts with various complex shapes, but also office equipment, metal front machines, etc., and it is extremely effective in reducing vibration and noise in various fields. Stop by! It is used.

[Brief explanation of the drawing]

Both Figures 1 and 2 show vibration damping metal 1+C according to the present invention.
There is no relationship between the loss coefficient of the intermediate layer of the I plate and the altitude, which is disappointing. Particularly, f'1 Applicant: Priest/Agent of NE Co., Ltd.
Patent Attorney 1) Figure 1 Obliqueness (0c) Figure 2 Sarayo)

Claims (1)

[Scope of Claims] (1) An intermediate layer mainly composed of an acryl, nitrile-butadiene, and a heat-cured 1j:+-boxy resin is sandwiched between two metal plates. , "A vibration-damping metal plate formed by heating and curing the middle layer of a single layer. (2) The composition ratio of the acrylonitrile loop curable epoxy resin to the acrylonitrile loop curable epoxy resin is acrylic I + nitrile dibutadiene copolymer. The damping metal plate according to claim (1), which is 100 parts by weight (iI part) of heat-curing epoxy resin for 111 parts of 20 to 20'0 m. Main component consisting of heat-curing epoxy resin
(4) Acrylic + 1 nitrile-butadiene copolymer rubber or maleino The patent claim has been changed to acid! Box (1) ~ (
The vibration-damping metal plate according to any one of 3).