JP3295914B2 - Sheet obtained from pressure-sensitive adhesive vibration damping composition and damping material using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive vibration damping set.
For more information on sheets obtained from products and vibration damping materials using the same, for details, attenuate vibrations generated from vibration sources such as home appliances, office equipment, housing equipment, machine tools, automobiles, railway vehicles, etc. The present invention relates to a sheet obtained from a pressure-sensitive adhesive vibration damping composition and a vibration damping material using the same, which are preferably used to reduce the vibration.

[0002]

2. Description of the Related Art In recent years, complaints about noise generated from automobiles, home appliances, office equipment, housing equipment, machine tools, railway vehicles, and the like have been highlighted. These devices have been reduced in weight from the viewpoints of energy saving, cost reduction, improvement of design techniques, and the like, and consequently, the noise problem has become conspicuous.

As one of the countermeasures, the use of a vibration damping material has become popular. In particular, the method of attenuating vibration by attaching a sheet-shaped vibration damping material to the location where noise is generated by vibration and suppressing noise is widely used because it does not require a large design change and is easy to process. Is the way you are.

Conventionally, as a sheet-like vibration damping material, a vibration damping material formed by molding a mixture of asphalt, rubber, vinyl chloride resin or the like and a filler such as mica into a sheet is used as an adhesive. Alternatively, a joining method using a mechanical method such as a bolt is known.

Specifically, for example, Japanese Patent Publication No. 58-52
No. 943, the straight asphalt 10
0 parts by weight, mica 7 having a particle size of 350 mesh or less
The use of 0 to 130 parts by weight is recommended.

In Japanese Patent Application Laid-Open No. 63-236633, it is recommended to use 5 to 30 parts by weight of a scaly filler per 100 parts by weight of vinyl chloride.

[0007]

However, according to these proposals, a mica material which converts vibration energy, which is most important as a vibration damping material, into heat energy, is a material which exhibits pressure-sensitive adhesiveness. There is no mention of use and what mica to choose.

In addition, such a vibration damping material in which the viscoelastic layer exhibits pressure-sensitive adhesiveness has a simple structure, is thin and lightweight, and can be instantly adhered to an applied portion, so that workability is improved. In such a vibration damping material, the temperature range in which the vibration damping property is exhibited is narrow, and the vibration damping property has a large temperature dependence.
At the above-mentioned high temperature, the required vibration damping property is not exhibited, so that there is a problem that the use is restricted.

The present invention has been completed to solve the above-mentioned technical problems, and has been developed for a specific pressure-sensitive adhesive vibration damping set.
By using a sheet obtained from a product , the structure is simple, thin and lightweight, and it can be instantly adhered to the application site, so workability is improved and the temperature range showing vibration damping properties is wide, pressure-sensitive adhesive vibration damping assembly that can be widely used
It is an object to provide a sheet obtained from a product and a vibration damping material using the sheet .

[0010]

SUMMARY OF THE INVENTION A sheet obtained from the pressure-sensitive adhesive vibration damping composition of the present invention has a pressure-sensitive adhesive property and is used for reducing noise by reducing vibration. The sheet obtained from the damping composition employs the following technical means to achieve the above object.

That is, in the present invention, the vibration damping set
The sheet obtained from the product is obtained by mixing mica having an average particle size of 50 μm or more into a rubber composition obtained by mixing an isobutylene-isoprene copolymer or polyisobutylene as a main polymer and a tackifier, and 0 ° C-8
Dynamic shear storage modulus at 0 ° C. and 1 Hz is 1.0 × 10
It is not less than ⁵ dyn / cm ^{2 and not} more than 1.0 × 10 ⁷ dyn / cm ² .

Hereinafter, the present invention will be described in detail. In the present invention, in order to develop pressure-sensitive adhesiveness, an isobutylene-isoprene copolymer or
It is necessary to use polyisobutylene .

[0013] In the present invention,
Isobutylene-isoprene copolymer or polyisobutyl
Tylene is particularly desirable because of its high loss factor and good weather resistance.
Good.

In the present invention, the above-mentioned isobutylene
-A tackifier is blended with the isoprene copolymer or polyisobutylene, and, if desired, a softener is blended.

Specific representative examples of the tackifier used in the present invention include, for example, rosin resin, terpene resin, petroleum resin, coumarone indene resin, phenol resin, xylene resin and alkyd resin. These generally have a higher glass transition point than the rubber as the main component, and have the effect of increasing the peak temperature of the loss coefficient.

Specific representative examples of the softener used in the present invention include, for example, polybutene, polyisobutylene, phthalate, phosphate, paraffin and the like. These generally have a lower glass transition point than the rubber as the main component, and have the effect of lowering the peak temperature of the loss coefficient of the entire system. Therefore, the amounts of the tackifying resin and the softening agent are adjusted so that the loss coefficient becomes maximum at the temperature used.

In the present invention, by adding mica powder as a filler, the temperature dependence of the loss coefficient can be reduced without lowering the peak value of the loss coefficient.

The mica powder used in the present invention preferably has an average particle size of 50 μm or more, preferably 100 μm or more. When the average particle size of the mica powder is less than 50 μm, the temperature dependency cannot be reduced, the dynamic shear storage modulus increases, and the pressure-sensitive adhesiveness is hardly exhibited. On the other hand, when the average particle size of the mica powder exceeds 2,000 μm, the dispersibility of the mica powder deteriorates, and as a result, the entire layer becomes non-uniform and the quality may not be stable. More preferably, the average particle size of the mica powder is particularly in the range of 100 to 1000 μm.

The amount of mica powder to be added is as follows.
The amount is preferably 50 to 200 parts by weight, more preferably 80 to 150 parts by weight, based on 0 parts by weight.

If the amount of mica powder is too small, less than 50 parts by weight, the effect of reducing the temperature dependence of the loss coefficient is poor, while if it exceeds 200 parts by weight, the dynamic shear storage modulus increases. However, it is not preferable because the pressure-sensitive adhesiveness becomes poor.

In the present invention, in the pressure-sensitive adhesive vibration damping composition, if necessary, at least one selected from various fillers, crosslinking agents, accelerators, antioxidants or pigments is added in an appropriate amount. Is also good.

[0022] In the present invention, the pressure sensitive resistance vibration damping composition is molded into a sheet pressure sensitive adhesive vibration damping assembly
Although a sheet obtained from the product is obtained, the molding method is not particularly limited, and specific examples include extrusion molding, calendar sheeting, press molding, sheeting with a mixing roll, and the like.

In this case, from the pressure-sensitive adhesive vibration damping composition
The thickness of the obtained sheet is preferably in the range of 0.1 mm to 3 mm, and if it is too thin as less than 0.1 mm, it will not show sufficient damping properties. Does not improve much, is meaningless, is heavy, and is uneconomical.

The vibration damping composition used in the present invention
The sheet obtained from the product may have a temperature of 0 ° C to 80 ° C,
Dynamic shear storage elastic modulus at Hz is 1.0 × 10 ⁵ dyn
/ Cm ² or more and 1.0 × 10 ⁷ dyn / cm ² or less. If the dynamic shear storage modulus under this condition exceeds 1.0 × 10 ⁷ dyn / cm ² , the required pressure-sensitive adhesiveness will not be exhibited, while 1.0 × 10 ⁵
If it is less than dyn / cm ² , the loss coefficient, which is an index of the vibration damping property, is undesirably low.

Further, in the vibration damping material of the present invention, in order to achieve the above object, the pressure-sensitive adhesive vibration damping composition of the present invention is used.
Characterized in that the sheet obtained from the above is adhered and laminated on the restraint plate.

The restraint plate used in the present invention is preferably a metal or a plastic having a Young's modulus of 1000 kg / mm ² or more, such as iron, aluminum, or the like.
Examples thereof include stainless steel, zinc-treated steel sheet, nickel, copper, phosphor bronze, and duralumin. As the plastic, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polypropylene, hard vinyl chloride, and the like are preferable.

The thickness of the restraint plate is preferably in the range of 0.03 mm to 2 mm. In particular, when the Young's modulus of the restraint plate is higher than that of the diaphragm of the vibration source, the thickness of the restraint layer is It is desirable that the thickness be equal to or less than the thickness of the diaphragm.

[0028]

The pressure-sensitive adhesive vibration damping composition of the present invention is obtained.
The above-mentioned sheet has the above-mentioned structure, and a mica having an average particle size of 50 μm or more is mixed in a rubber-based composition containing rubber as a main component. The rate is 1.0 × 10 ⁵ dyn / cm ² or more.
Since it is 0 × 10 ⁷ dyn / cm ² or less, the temperature dependence of the loss coefficient can be reduced without lowering the peak value of the loss coefficient, and the required pressure-sensitive adhesiveness is exerted. .

In the vibration damping material of the present invention, since the mica of a specific size is mixed with the sheet obtained from the pressure-sensitive adhesive vibration damping composition of the present invention, the peak value of the loss coefficient is reduced. This has the effect that the temperature dependence of the loss coefficient can be further reduced without any problem.

[0030]

The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 The following materials were kneaded with a pressure kneader to obtain a pressure-sensitive adhesive vibration damping composition.

70 parts by weight of polyisobutylene rubber (Vistanex MML-80 manufactured by Exxon) 30 parts by weight of polyisobutylene rubber (Tetrax 5T manufactured by Nippon Petrochemical Co.) 100 parts by weight of Quinton N-190 (manufactured by Zeon Corporation) Nisseki Polybutene HV-15 (Nippon Petrochemical) 50 parts by weight Carbon # 50 (Tokai Carbon Co., Ltd.) 50 parts by weight Light calcium carbonate 50 parts by weight Talc 30 parts by weight Mica powder (average particle size 120 μm) 120 parts by weight

The obtained pressure-sensitive adhesive vibration damping composition was formed into a sheet having a thickness of 2 mm by an extruder to obtain a sheet obtained from the pressure-sensitive adhesive vibration damping composition .

An aluminum foil having a thickness of 100 μm was used as a restraining plate, and this aluminum foil was adhered to a sheet obtained from the pressure-sensitive adhesive vibration damping composition to obtain a vibration damping material.

Example 2 The following materials were kneaded in a pressure kneader to obtain a pressure-sensitive adhesive vibration damping composition.

100 parts by weight of butyl rubber (butyl 268 manufactured by Exxon Corporation) 90 parts by weight of Toho High Resin # 90 (manufactured by Toho Chemical Industry Co., Ltd.) 40 parts by weight of Nisseki Polybutene HV-15 (manufactured by Nippon Petrochemical Company) 40 parts by weight of carbon # 50 (Tokai 40 parts by weight Heavy calcium carbonate 50 parts by weight Talc 50 parts by weight Mica powder (average particle size 300 μm) 140 parts by weight

The obtained pressure-sensitive adhesive vibration damping composition was formed into a sheet having a thickness of 2 mm by an extruder to obtain a sheet obtained from the pressure-sensitive adhesive vibration damping composition .

As a restraining plate, sus3 having a thickness of 100 μm was used.
SUS 304 stainless steel foil, and the stainless steel foil obtained from the pressure-sensitive adhesive vibration damping composition was used.
A damping material was obtained by adhering to the sheet .

Comparative Example 1 The following materials were kneaded in a pressure kneader to obtain a pressure-sensitive adhesive vibration damping composition.

40 parts by weight of butyl rubber (butyl 268 manufactured by Exxon) 90 parts by weight of Toho High Resin # 90 (manufactured by Toho Chemical Industry) 40 parts by weight of Nisseki Polybutene HV-15 (manufactured by Nippon Petrochemical Co.) 40 parts by weight Heavy calcium carbonate 50 parts by weight Talc 150 parts by weight

The obtained pressure-sensitive adhesive vibration damping composition was formed into a sheet having a thickness of 2 mm by an extruder to obtain a sheet obtained from the pressure-sensitive adhesive vibration damping composition .

As a restraining plate, sus3 having a thickness of 100 μm was used.
SUS 304 stainless steel foil, and the stainless steel foil obtained from the pressure-sensitive adhesive vibration damping composition was used.
A damping material was obtained by adhering to the sheet .

Comparative Example 2 The following materials were kneaded in a pressure kneader to obtain a pressure-sensitive adhesive vibration damping composition.

100 parts by weight of butyl rubber (butyl 268 manufactured by Exxon) 90 parts by weight of Toho High Resin # 90 (manufactured by Toho Chemical Industry) 40 parts by weight of Nisseki Polybutene HV-15 (manufactured by Nippon Petrochemical Co.) Carbon # 50 (Tokai) 40 parts by weight Heavy calcium carbonate 50 parts by weight Talc 50 parts by weight Mica powder (average particle size 30 μm) 140 parts by weight

The obtained pressure-sensitive adhesive vibration damping composition was formed into a sheet having a thickness of 2 mm by an extruder to obtain a sheet obtained from the pressure-sensitive adhesive vibration damping composition .

As a restraining plate, sus3 having a thickness of 100 μm was used.
SUS 304 stainless steel foil, and the stainless steel foil obtained from the pressure-sensitive adhesive vibration damping composition was used.
A damping material was obtained by adhering to the sheet .

Performance Evaluation Test Method 1) Dynamic Shear Storage Modulus The pressure-sensitive adhesive vibration damping composition of each of the examples and comparative examples was measured using an RDS2 dynamic viscoelastic property measuring device of Rheometrics.
Dynamic storage elastic modulus of only the sheet obtained from the product (1
Hz) was measured at 0 ° C and 80 ° C.

2) Vibration damping A 1.6 mm SPCC steel plate was used as the adherend, and the center vibration method was used.
, A loss coefficient η, which is a measure of vibration damping, was measured.

3) Pressure Sensitive Adhesive The adherend SPCC steel plate and the damping material of each of the examples and comparative examples cut into a width of 25 mm were stored in a thermostat at 5 ° C. for 30 minutes.
The rubber sheet was pressure-bonded with a kg rubber roller and immediately measured for 90-degree peeling with a tensile tester (tensile speed: 300 mm / min).

[0050]

[Table 1]

[0051]

[Table 2]

From the results shown in Tables 1 and 2, the following can be recognized. That is, it was recognized that the mounting of the vibration damping material was extremely easy because the materials of Examples 1 and 2 exhibited high vibration damping characteristics in a wide temperature range even though they were thin, and exhibited excellent pressure-sensitive adhesiveness. Can be

In comparison with this, as can be seen in Comparative Example 1.
In the absence of mica powder, the loss coefficient has a large temperature dependency, and it is recognized that the loss coefficient decreases significantly at high temperatures. Also, as seen in Comparative Example 2, when the dynamic shear storage elastic modulus at 0 ° C. is high, sufficient pressure-sensitive adhesiveness is not exhibited, so that it is recognized that mounting of the vibration damping material is extremely difficult.

[0054]

According to the present invention, there is provided a vibration damping composition.
The resulting sheet has an average particle size of 50 μm in a rubber composition obtained by blending a tackifier with an isobutylene-isoprene copolymer or polyisobutylene as a main polymer.
m mica or more, and at a temperature of 0 ° C to 80 ° C, 1
Dynamic shear storage elastic modulus at Hz is 1.0 × 10 ⁵ dyn
/ Cm ² or more and 1.0 × 10 ⁷ dyn / cm ² or less, so that the structure is simple, thin and lightweight, and particularly,
Since it shows excellent pressure-sensitive adhesiveness, it is extremely easy to attach the damping material, so that it can be instantly adhered to the application site, resulting in marked improvement in workability and temperature at which the damping property is exhibited. It has a wide range and can be used widely.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-2877651 (JP, A) JP-A-64-48952 (JP, A) JP-A-6-57036 (JP, A) JP-A-7-78 118448 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 21/00 B32B 25/02 F16F 15/02 B32B 7/10

Claims (2)

(57) [Claims] 1. A vibration damping composition having pressure-sensitive adhesive properties and used for damping vibration to reduce noise .
The sheet obtained from this vibration damping composition
The resulting sheet has an average particle size of 50 μm in a rubber composition comprising isobutylene-isoprene copolymer or polyisobutylene as a main polymer and a tackifier added thereto.
Mix the above mica, and at a temperature of 0 ° C to 80 ° C, 1H
The dynamic shear storage modulus at z is 1.0 × 10 ⁵ dyn /
obtained from pressure-sensitive adhesive vibration damping composition, wherein the at cm ² or more 1.0 × ¹⁰ 7 dyn / cm ² or less
Sheet . 2. The pressure-sensitive adhesive vibration damping set according to claim 1.
A vibration damping material comprising a sheet obtained from a product laminated on a restraining plate.