JPH0681808B2 - Anti-vibration material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-proof material using silicone gel as a base material.

[0002]

2. Description of the Related Art A conventional vibration-damping material for absorbing vibration waves is constructed by using an elastic material such as a cushion material so that the vibration waves applied to the vibration-damping material are absorbed by elastic deformation of the elastic material. However, in such a vibration-proof material, a secondary vibration wave is generated due to the repulsive elasticity of the elastic material, so that absorption of the vibration wave is hindered or a large resonance phenomenon occurs. For this reason, it has recently been proposed to use silicone gel as a vibration wave absorbing material. In this silicone gel, since the applied vibration wave is absorbed by the inelastic deformation of the silicone gel, the impact resilience is small. In addition to suppressing large resonance, it has the effect of quickly absorbing and absorbing the applied vibration wave. Thus, such a silicone gel material is obtained by gelling a silicone resin as a material, and is JIS K 2530-197.
The value measured with 6- (50 g load) is 50 to 200
Something is selected. Since such a silicone gel material has a good pressure conductivity similar to that of a liquid, the locally applied external vibration wave is promptly and uniformly dispersed and transmitted to the surroundings to differentiate it. It has the property of absorbing the pressure of the differentiated vibration wave by its own inelastic deformation, so that it does not generate repulsive elasticity against the vibration wave from the outside, and the external pressure, that is, the vibration wave is internal to the silicone gel material. In the above, there was an effect that it was absorbed by the overall action. As such a silicone gel material, the trade name Toray Silicone CY52 (manufactured by Toray Silicone Co., Ltd.) is preferable, and in this silicone gel material, the silicone resin as the raw material is divided into the liquid A and the liquid B. hand,
It is possible to obtain a silicone gel material having a desired penetration by mixing these two solutions at a predetermined ratio and heating them.

[0003]

Such a silicone gel is easily deformed by an oscillating wave applied from the outside, and only intermolecular friction due to the deformation becomes a resistance force for absorbing the oscillating wave. There is a problem that the absorption effect is deteriorated when the absorbing power is not sufficient and therefore the vibration wave energy is large, and there is also a problem that it is difficult to control the resonance frequency for the vibration wave. Since it is low, there is also a problem that the spring constant is small and the resonance transmissivity is high.

[0004]

In the present invention, a silicone gel having a penetration of about 50 to 200 is used as a base material, and micro hollow spheres, that is, generally microspheres, microballoons, hollow bubbles, synthetics, are contained in the base material. A large number of minute hollow spheres having a size of 5 μm to 300 μm, which is called a foam material, are mixed in, and this improves the vibration wave absorption characteristics of the silicone gel material. In the present invention, an inorganic hard sphere is used as the above micro hollow sphere, and such a micro hollow sphere is preferably aluminosilicate micro hollow sphere under the trade name Philite (manufactured by Nippon Philite Co., Ltd.), In the present invention, 25 to 50% by weight of these micro hollow spheres are mixed. The needle penetration shown here is JIS K 2530-1976- (50
g load). This standard relates to a petroleum asphalt penetration test method, and a sample with a penetration of 350 or less is tested with a load of 100 g.
It is implemented as g.

[0005]

[Operation] Since the anti-vibration material of the present invention has a large number of minute hollow spheres made of an inorganic material dispersed and mixed in a silicone gel base material that absorbs vibration waves by inelastic deformation, vibration waves from the outside Is rapidly dispersed in the base material, and is absorbed by the intermolecular frictional resistance due to the deformation of the base material itself and the frictional resistance generated between the silicone gel and the micro hollow spheres due to the deformation of the base material. Moreover, since the micro hollow spheres change the spring constant of the vibration isolator in a larger direction by being mixed in the silicone gel, the absorption amount of the vibration wave, the resonance frequency, and the resonance can be changed depending on the mixing amount of the micro hollow spheres. Magnification, hardness, etc. can be adjusted.

[0006]

EXAMPLE As shown in FIG. 1, the vibration damping material of the present invention has a penetration of 5
It is made by mixing a large number of minute hollow spheres 2 made of an inorganic material, for example, an aluminosilicate material, in a base body 1 made of about 0 to 200 silicone gel. The mixing amount of the hollow microspheres 2 is 25 to 50% by weight. If it is less than 25% by weight, the vibration wave absorbing effect is not sufficient, and if it exceeds 50% by weight, it becomes difficult to produce a silicone gel base material.
That is, the micro hollow sphere 2 is prepared by mixing two kinds of silicone resin liquids A and B, which are raw materials for the silicone gel material, and then dropping and mixing the mixture into the mixed raw material liquid. Since the resin liquid is gelated by the heat treatment, the upper limit of the amount of the micro hollow spheres 2 mixed is determined as a manufacturing condition of the silicone gel base material.

Thus, the vibration damping material of the present invention has a good vibration wave absorbing effect in the low frequency band as shown in FIGS.
The vibration-proof material of the present invention is in the low frequency band (5 to 100 Hz) below.
The results of the experiment for measuring the vibration wave absorption characteristics in FIG. In this experiment, an insulator made by filling a vibration-damping material of the present invention in which the amount of the mixed phyllite was determined in advance into a silicone rubber cylinder having a diameter of 30 mm and a height of 20 mm was used. The relationship was measured. In the experiment shown in each figure, three insulators were used, and these three insulators were placed on a vibration table with an acceleration of 0.15G, and a load of 6 kg was supported by these three insulators. ,
The vibration G of the vibration table and the vibration G'transmitted on the load were measured by the relationship of G '/ G. The 0db line indicates the level at which the transmissibility T is "1", and the transmissibility T (db) =
It is obtained by the calculation formula of 20 log (G '/ G). As is clear from FIGS. 2 to 7, in the vibration damping material of the present invention, the resonance point P shifts to the high frequency side as the mixing ratio of the phyllite increases. This is because the hardness of the vibration damping material increases as the amount of the mixed phyllite increases, and the spring constant increases accordingly. The anti-vibration effect has a transmissibility curve of 0db
Since it is obtained only after moving below the line, it is common to set the resonance point P to the low frequency side so as to absorb the vibration on the high frequency side. Since it is 60 Hz, the resonance point P is set to about 20 to 30 Hz in this case. Since the load is unchanged in the experiment, the resonance point P shifts to the high frequency side when the addition amount of the phyllite increases,
This can be moved to the lower frequency side by increasing the load, so the amount of the mixed phyllite may be determined in relation to the load. Further, the position of the resonance point P can be moved by changing the diameter or height of the insulator, as is clear from the fact that this is determined by the spring constant of the vibration isolator.

Next, the transmissibility at the resonance point of the vibration-proof material of the present invention, that is, the resonance magnification will be described. As is well known, in the vibration wave absorber, it is desired that the transmissivity of the resonance point is small and the resonance point P is in the frequency band of 15 to 20 Hz. Therefore, the transmission rate can be reduced. The transmissibility T of this resonance point P
Can be reduced by increasing the amount of mixed phyllite when the load is constant. The antivibration material used in the experiment shown in FIG. 2 contains 5% by weight of phyllite, and is shown as sample number 1 in the following Table 1. In the experiment shown in FIG. 3, a vibration damping material containing 10% by weight of phyllite was used, which is shown as sample number 2 in FIG. In the experiment shown in Fig. 4, a vibration damping material containing 20% by weight of phylite was used.
Indicated by. In the experiment shown in FIG.
An anti-vibration material mixed with wt% was used, which is shown as sample number 4 in Figure 1. In the experiment shown in FIG. 6, a vibration-damping material mixed with 30% by weight of phyllite was used, and this is shown as sample number 5 in FIG. In the experiment shown in FIG. 7, a vibration damping material mixed with 40% by weight of phylite was used, and this is shown as sample number 6 in FIG.

[0009]

According to the vibration isolator of the present invention, the micro hollow spheres 2 made of an inorganic material are mixed into the silicone gel substrate 1 which absorbs the vibration wave by the inelastic deformation as described above, whereby the spring constant Since the adjustment and the improvement of the vibration wave absorbing function are made possible, it is possible to solve the problems of the vibration-proof material using only the silicone gel, and to have an effect that it can be used for a wide range of purposes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a vibration damping material of the present invention.

FIG. 2 is a chart showing the transmissibility of the vibration isolator of the same.

FIG. 3 is a chart showing the transmissibility of the vibration isolator.

FIG. 4 is a chart showing the transmissibility of the vibration isolator.

FIG. 5 is a table showing the transmissibility of the vibration damping material of the above.

FIG. 6 is a chart showing the transmissibility of the vibration isolator.

FIG. 7 is a chart showing the transmissibility of the vibration damping material of the above.

[Explanation of symbols]

 1 Silicone gel substrate 2 Micro hollow sphere

Claims (2)

[Claims] 1. JIS K2530-1976-50 g
25 to 50% by weight of a large number of micro hollow spheres are mixed into a silicone gel having a penetration of 50 to 200 by a load as a base material, and the micro hollow spheres are made of an inorganic material. Anti-vibration material. 2. The vibration damping material according to claim 1, wherein the hollow microspheres are made of an aluminosilicate material.