JPS61162530A - Vibration damper - Google Patents

Abstract

PURPOSE:A light-weight sheet vibration damper having high performance, obtained by processing a composition consisting of a polyvinyl chloride resin by emulsion polymerization method, a plasticizer, and a scaly inorganic filler into a sheet by coating method. CONSTITUTION:(A) 100pts.wt. polyvinyl chloride resin obtained by emulsion polymerization method is blended with (B) 30-150pts.wt., preferably 40-100pts. wt. one or more plasticizers such as dioctyl phthalate, diethyl adipate, (C) 40-150pts.wt., preferably 60-120pts.wt. one or more scaly inorganic fillers having <=10 meshes, preferably <=200 meshes, such as graphite, mica, talc, etc. and, if necessary, a stabilizer, an additive, etc., and mixed by a propeller type agitator at 50-500rmp, preferably at 50-200rpm, to give a paste composition, which is applied to a release paper with 0.5-3.5mm thickness by knife coating method, etc., heat-treated, and the release paper is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vibration damping material, more specifically, a lightweight, high-performance sheet-like damping material comprising a soft polyvinyl chloride resin as a matrix and a scale-like inorganic filler mixed therein. Regarding the swing material q.

Conventional technology and problems to be solved
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A vibration damping material, that is, a damping material, is applied to the floor part Iζ of the vehicle body, which absorbs vibration noise transmitted from the surface and alleviates and suppresses it. As such a vibration damping material, for example, a sheet material having a bituminous material (such as asphalt) as a matrix and adding an inorganic filler such as asbestos or talc to this matrix is widely used. Although this bituminous sheet material is economically advantageous because it is relatively cheap, it is very heavy, and in the summer, the sheets fuse together and cannot be separated.
On the other hand, in winter, it hardens and the workability Cζ deteriorates. In particular, the disadvantage of the increased weight mentioned above can be said to be a hindrance to the industry's desire to reduce vehicle weight in order to improve fuel efficiency.

In response, various public institutions and companies have recently begun to consider attempts to use lightweight rubber-based materials. However, the phase transition point of rubber materials, which is the basis of vibration damping performance, is in the low temperature region, and the maximum value of the loss coefficient is also in the low temperature region. The low practical μmH is 100shu zero, 1. The present inventor has carried out intensive research to develop a lightweight and high-performance vibration damping material, including the problem of rubber-based materials, and has discovered the knowledge shown below.

(1) Among various synthetic resins, it has a high loss coefficient, flame retardancy,
By using a flexible polyvinyl chloride resin with excellent economic efficiency as a matrix and adding a scale-like inorganic filler to the matrix, it is possible to enhance the vibration damping effect and promote light chain formation.

(2) The scale-like inorganic filler has a layered structure in the sheet,
It has a property that the applied vibration energy is consumed as shear kinetic energy of the scale-like inorganic filler, and it is considered that the vibration damping effect is improved. In order to fully demonstrate this property, ■ The soft polyvinyl chloride resin must sufficiently cover the surface of the scaly inorganic filler and have good adhesion ■ The rIA flaky inorganic filler must be arranged in a layered manner ■ , [The following three conditions are necessary: the aspect ratio (ratio of length to diameter width) of the scaly inorganic filler is sufficiently large.

It is necessary to uniformly knead the 131 m flaky inorganic filler with the soft polyvinyl chloride resin of the matrix resin. For this reason, it is necessary to mix roses with extremely high shear force using a kneader-1 Henschel mixer or screw kneader for a long period of time. It is easily destroyed, the aspect ratio decreases, and the degree of layered orientation also decreases. This phenomenon is based on the existence of the layered structure mentioned above (reducing the consumption of vibration energy due to shear motion and its volatilization, and lowering Young's modulus, resulting in a decrease in loss coefficient and vibration damping performance). bring.

(4) Among the soft polyvinyl chloride resins used as matrix resins, polyvinyl chloride resins produced by suspension polymerization (suspension polymerization polyvinyl chloride resins, hereinafter referred to as suspension PVC) cannot be used. Although some studies are considering this, the average particle size is about 100μ, and in order to plasticize it by adding a plasticizer, heating 3 and high shear force must be used, resulting in a scaly shape. Even when mixing inorganic fillers, destruction always occurs and the aspect ratio decreases. Also, in sheet formation, calendering and extrusion molding are employed, but the filler is destroyed due to strong shearing force, and the desired layered structure cannot be obtained. On the other hand, polyvinyl chloride resin produced by emulsion polymerization method (emulsion polymerization method polyvinyl chloride resin, hereinafter emulsion PVC)
The average size of the particles is about 1 μm, and in this case, a plasticized material in a fluid state can be easily obtained in a sufficient and short period of time by adding a plasticizer and using a propeller-type stirrer rotating at low speed. This varies depending on the type and amount of plasticizer used, but
It is in the form of a paste with extremely low viscosity and can sufficiently wet the surface of the scale-like inorganic filler, and therefore has sufficient adhesion.1. The scale-like inorganic filler is less likely to be destroyed, and coating methods with low shearing force, such as knife coating and roll coating, can be used to form sheets. Therefore, a sheet material in which the scale-like inorganic filler is sufficiently oriented to a desired degree can be obtained.

The gist thereof lies in a sheet-shaped vibration damping material characterized by being formed into a sheet by a coating method from a mixed composition consisting of emulsified PVC, a plasticizer, and a scaly inorganic filler.

As the emulsified PvC according to the present invention, commercially available ones may be used.

Examples of plasticizers used in the present invention include phthalate esters (diethyl phthalate, dibutyl phthalate, dihexyl phthalate, dioctyl phthalate, dinonyl phthalate,
diisodecyl phthalate, undecyl phthalate, etc.), z
and adipate esters (diethyl adipate, dibutyl adipate, etc.), and one or a mixture of two or more of these may be used. The amount used is usually 30 to 1 part per 100 parts (by weight, same below) of emulsified PVC.
The amount may be selected in the range of 50 parts, preferably 40 to 100 parts. If necessary, ordinary stabilizers (dibutyltin laurate, epoxidized soybean oil, Ba/Zn system, etc.) and additives are blended according to conventional methods. Any flake-like material known per se may be used, such as graphite, mica, talc, glass flakes, aluminum flakes, etc. One or a mixture of two or more of these may be used. The size is not particularly limited, but if it is too small, it is difficult to obtain the desired vibration damping effect, so generally 10 meshes or less, preferably 200 meshes or less is appropriate.The amount used is very small. Since no improvement in damping performance can be expected, general jc'A
A suitable amount is 40 to 150 parts, preferably 60 to 120 parts, per 100 parts of PVC+c.

The sheet-like damping material according to the present invention includes the above-mentioned emulsified PVC,
a plasticizer, a scaly inorganic filler B and, if necessary, a stabilizer,
It is manufactured by blending additives and the like in predetermined proportions, mixing them, and then forming the resulting paste composition into a sheet using a coating method.

The above mixing can be carried out using a stirrer equipped with propeller-type stirring blades, which has been conventionally used for stirring and mixing low-viscosity paints and resins, and high-speed rotation is not required for uniform mixing. From the viewpoint of preventing a reduction in aspect ratio due to destruction of the scale-like inorganic filler and preventing scattering, the rotation speed is as low as possible, for example, so to so or, p, m, preferably 50 to 200 r.

p, m, are adopted.

In addition, when forming the above-mentioned sheet, the paste composition is coated on a carrier such as release paper or a synthetic resin film to a predetermined thickness (usually 0.5 to 3 mm) using a coating method (e.g. knife coating method, roll coating method, etc.). .511
), heat-treated to gel by a conventional method, and after cooling, the carrier is removed to obtain the desired sheet material. It is also possible to coat the surface of the sheet with an adhesive if necessary.

In the sheet-shaped vibration damping material of the present invention having the above-described structure, the scale-like inorganic filler forms a sufficient layered structure to the desired extent in the sheet, and exhibits the desired vibration damping performance at the actual use temperature (room temperature). Moreover, it is recognized that it satisfies the demand for reducing vehicle weight by using lightweight materials such as matrix resins.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Example 1 60 parts of dioctyl phthalate was added to 100 parts of emulsified PVC (Kane Vinyl Paste PSH-20, manufactured by Kanebuchi Chemical Industry Co., Ltd.).
1 part, 3 parts of epoxidized soybean oil (manufactured by Adeka Argus) and Ha, Zn-based stabilizer (11 parts by Adeka 71 Kasu)
Blend 2 parts and mix this with a propeller type stirrer at 50 Or
Stir and mix with a trowel for 5 minutes to obtain a viscosity of 2000 cps.
A paste is obtained. Next, mica with an average particle size of 280 μm (Sugilite Mica 605.
(manufactured by Kuraray Co., Ltd.) and stirred and mixed with the same propeller type stirrer for 5 minutes using a 7 Or, p, m, l trowel until the viscosity was 6.
A pasty composition of 0000 cps is obtained.

This paste-like composition is knife-coated onto release paper to a thickness of 1.5N, followed by heat treatment at 200''c for 5 minutes, and then peeled off from the release paper to create a sheet-like material. Measure the loss factor 8 and overlay of the sheet material,
Furthermore, the particle size distribution of mica in the sheet is observed and measured. The results are shown in Table 1.

Loss factor: Paste the sheet material on a 0.8x40x400n cold rolled steel plate, meet the Japanese Automobile Standard JASO700.
Set one end of the test force specified in 6 on the fixing jig (22
”C) and calculated using the cantilever resonance method, which takes the attenuation curve at the resonance point.

Particle size distribution: Observe the distribution of mica in the sheet with the naked eye, then dissolve the sheet in tetrahydrofuran and measure the average particle size of the remaining mica (this will be a guide to the degree of destruction of mica by sheeting).

Comparative Example 1 Suspension PVC (Zeon 103EP, Nippon Zeon Co., Ltd. 1) 10
0 parts, 60 parts of dioctyl phthalate, 3 parts of epoxidized soybean Σ, and 60 parts of mica with an average particle size of 280μ,
Next, a sheet material having a thickness of 1.5 silk is produced using an extrusion molding machine. A measurement test was conducted in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 2 Using an asphalt sheet with a thickness of 2H as a commercially available product,
The loss coefficient B and superimposition are also listed in Table 1.

Table 1 From the results in Table 1, it was found that the vibration damping material of the present invention according to Example 1 had a weight of about 273 compared to the commercially available product, and was significantly improved even if the loss coefficient was 2.

Claims (1)

[Scope of Claims] 1. A sheet-shaped vibration damping material comprising a mixed composition comprising an emulsion polymerized polyvinyl chloride resin, a plasticizer, and a scaly inorganic filler formed into a sheet by a coating method. 2. The ratio of each component is 1 to 1 for emulsion polymerization polyvinyl chloride resin
2. The sheet-like vibration damping material according to item 1 above, wherein the content is 30 to 150 parts of a plasticizer and 40 to 150 parts of a scaly inorganic filler based on 0.00 parts by weight.