JP4618027B2 - Damping device - Google Patents

Description

  The present invention relates to an attenuating device, and more particularly to an attenuating device that has excellent attenuation performance and is easy to handle with less restrictions on installation location.

  A lead damper is known as an attenuation device that is installed on the foundation of a structure to attenuate vibration energy caused by an earthquake or wind with respect to the structure. The lead damper has excellent damping performance, but on the other hand, there is a problem that it is difficult to firmly integrate the flange-like mounting plate fixed to both ends and lead (for example, Patent Document 1). reference). If this fixing strength is insufficient, when the lead damper is subjected to vibration and undergoes shear deformation, cracks and delamination will occur in the fixed part and it will not function as a damping device, and it will also lack reliability. A fixing method that can be firmly integrated was required.

  Various proposals have been made for this fixing method. However, the conventional proposal cannot obtain a sufficient fixing strength, and there is no means for easily fixing, and an improvement is necessary.

Also, laminated rubber (LRB) containing lead may be used. However, the installation location of the LRB is limited by the lower part of the structure and the like, and it cannot be installed at a desired location, so that it is not easy to handle. was there.
Japanese Patent Laid-Open No. 2004-11785

  An object of the present invention is to provide an attenuation device that has excellent attenuation performance and is easy to handle with few restrictions on installation locations.

Damping device of the present invention for achieving the above object, a damping material comprising a trans-polyisoprene, is composed of a mounting plate which is bonded and fixed to both ends of the damping material, diene rubber and carbon black in the transformer polyisoprene And the damping material is a composition in which 40 parts by mass or more and 100 parts by mass or less of carbon black is blended with 100 parts by mass of polymer composed of trans polyisoprene and diene rubber, and the mass blend of trans polyisoprene in the polymer The ratio is 50% or more, the tensile yield stress of the damping material is 5 MPa or more, and the elongation at break is 150% or more.

According to the damping device of the present invention, the mounting plate is bonded and fixed to both ends of the damping material made of transpolyisoprene, which is an organic material. Therefore, the damping material and the mounting plate can be firmly fixed. It is possible to prevent cracks, separation, and the like from occurring in the fixing portion between the damping material and both plates due to shear deformation when receiving vibration.

  In addition, since the tensile yield stress of this damping material is 5 MPa or more, excellent damping performance equivalent to lead can be obtained, and the elongation at break is 150% or more. Since the plate is bonded and integrated, the installation location is not constrained at the bottom of the structure like LRB, and it can be installed in various locations, and its installation is easy. , Handling is improved.

  Hereinafter, the damping device of the present invention will be described based on the embodiments shown in the drawings. FIG. 1 illustrates a perspective view of the damping device 1.

  As shown in the figure, this damping device 1 is composed of a cylindrical damping material 3 made of transpolyisoprene, and a flange-shaped metal mounting plate 2 that is bonded and fixed to both upper and lower ends of this damping material 3. Yes. The damping material 3 is arranged at the center of the mounting plate 2, and the mounting plate 2 is provided with a mounting hole 2 a, and the damping device 1 is fixed to the structure or the like by a fixing tool such as a bolt inserted through the mounting hole 2 a. Established.

  In order to manufacture the damping device 1, for example, the damping material 3 and the plates 2 and 2 are bonded and fixed by vulcanizing the damping material 3 between the plates 2 and 2.

  FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1. The cylindrical damping member 3 can be solid as shown in FIG. 2A or hollow as shown in FIG. 2B. As described above, when a uniform shape is adopted around the central axis in the longitudinal axis direction of the damping material 3, the damping performance has no directivity, and the damping performance with no variation in all cross-sectional directions can be obtained.

  In FIG. 1, one damping material 3 is arranged at the central portion of the mounting plate 2, but the present invention is not limited to this, and the arrangement and the number of arrangement of the damping materials 3 are appropriately determined according to the required performance. The shape of the damping material 3 is not limited to a columnar shape, and various columnar shapes such as a prismatic shape and a cylindrical shape can be employed.

  Here, FIG. 3 illustrates the tensile properties of lead, general natural rubber (NR), and trans polyisoprene (TPI). As shown in FIG. 3, the tensile yield stress of lead is as high as about 13 MPa, but the elongation at break is small, about 30%, and natural rubber (NR) is not clearly shown in FIG. Is low and the elongation at break is about 500%. On the other hand, trans polyisoprene (TPI) has a physical property that the tensile yield stress is as high as 10 MPa or more and the elongation at break is about 400%.

  Therefore, the damping device 1 can obtain an excellent damping performance by using transisoprene having a tensile yield stress close to that of lead in the damping material 3 as a substitute for lead in the lead damper.

  Further, the damping material 3 bonded and fixed to both the plates 2 and 2 undergoes shear deformation when the damping device 1 receives vibration and the both plates 2 and 2 are relatively laterally displaced. However, the damping material 3 made of transpolyisoprene is Since it has a large elongation and can be firmly integrated by bonding to the mounting plate 2, it does not break due to cracks or peeling at the fixed part with the mounting plate 2 like a lead damper, and follows shear deformation. , Will have sufficient durability.

  As illustrated in FIG. 4, the damping device 1 can be placed separately from the rubber laminate 4 between the lower portion of the structure 5 and the installation surface 6 such as the foundation ground. Since the allowable deformation amount is large and both the plates 2 and 2 are firmly bonded and integrated, it is not limited to the lower part of the structure 5 as in the LRB, and the side surfaces and side walls of the structure 5 are installed. It can be installed between the surface 6. In addition to the location shown in this embodiment, it can be easily installed in a desired location where attenuation is required, so that it is easy to handle and contributes to increasing the degree of design freedom.

  Desirable physical properties of the damping material 3 include a tensile yield stress of 5 MPa or more and a breaking elongation of 150% or more. Within this range, good damping performance can be obtained and large deformation can be allowed during shear deformation without being damaged. Durability can be improved. The upper limit values of tensile yield stress and elongation at break are about 15 MPa and about 550%, respectively, as the physical property limit values of transpolyisoprene.

  The preferable range of the aspect ratio (the ratio of the height to the width) of the damping material 3 is 0.3 or more and 3.0 or less. In particular, by setting this range, an appropriate amount of shear deformation is ensured and excellent. Damping performance can be obtained.

  In the embodiment, the damping material 3 is transpolyisoprene. However, as long as the organic material has physical properties such that the tensile yield stress is 5 MPa or more and the elongation at break is 150% or more, it can be firmly bonded to the mounting plate 2 made of metal or the like. It becomes possible.

Further, when a composition in which carbon black is mixed with trans polyisoprene at a predetermined ratio is used as the damping material 3, a high tensile yield stress can be easily obtained due to the reinforcing effect of the carbon black, and the damping performance is improved. It becomes possible. Specifically, as a reference form , it is preferable to mix 40 parts by mass or more and 100 parts by mass or less of carbon black with respect to 100 parts by mass of transpolyisoprene.

This carbon black has a nitrogen adsorption specific surface area of 25 m ² / g or more and 260 m ² / g or less, preferably 70 m ² / g or more and 250 m ² / g or less, more preferably 190 m ² / g or more and 215 m ² / g or less. The oil absorption is 65 ml / 100 g or more and 150 ml / 100 g or less, preferably 70 ml / 100 g or more and 135 ml / 100 g or less, more preferably 95 ml / 100 g or more and 130 ml / 100 g or less.

  By making the nitrogen adsorption specific surface area and the DBP oil absorption amount within the above ranges, the reinforcing effect of carbon black can be further enhanced. The nitrogen adsorption specific surface area is a value measured according to ASTM D3037-89, and the DBP oil absorption is a value measured according to JIS K-6221.

  Trans polyisoprene is softened at about 60 ° C, and a composition in which carbon black is blended with it can be mixed, rolled, and extruded in the same manner as a normal rubber composition, and easily formed into a predetermined shape, for example, a cylindrical shape. It can be processed to a high level, has excellent mixing processability, and can be bonded to metal.

As in the present invention, when a predetermined proportion of diene rubber is blended with the damping material 3 in which carbon black is blended with trans polyisoprene, the temperature dependence on the shear modulus (modulus) of the composition can be reduced. Stable performance can be exhibited without being greatly affected by the temperature environment in which the attenuation device 1 is installed.

  Specifically, a composition in which 40 parts by mass or more and 100 parts by mass or less of carbon black is blended with 100 parts by mass of a polymer composed of trans polyisoprene and diene rubber is used as the damping material 3, and the trans polyisoprene in this polymer is blended. By making the mass blending ratio of 50% or more, it is possible to secure stable performance that is hardly affected by temperature while obtaining the excellent reinforcing effect by the carbon black described above.

  Diene rubbers include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), 1,2-polybutadiene rubber (1,2-BR), styrene-butadiene copolymer rubber (SBR), acrylonitrile- Examples include butadiene copolymer rubber (NBR, NIR, NBIR), butyl rubber (IIR), halogenated butyl rubber (Br-IIR, C1-IIR), chloroprene rubber (CR), ethylene propylene diene rubber (EPDM), and the like. Two or more types may be used in combination. In addition, if BR with a low glass transition point is used, the temperature dependence of the modulus can be further reduced.

Trans polyisoprene, butadiene rubber, and carbon black (nitrogen adsorption specific surface area 202 m ² / g, DBP oil absorption 126 ml / 100 g) were blended in the proportions shown in Table 1, and B-type Banbury mixer (1.8 L, manufactured by Kobe Steel) ) For 5 minutes, and a small proportion of sulfur and vulcanization accelerator (N-cyclohexyl-2-benzothiazolesulfenamide (CBS)) that does not affect the characteristics of the present invention are added to the kneaded product. The mixture was kneaded with an 8-inch kneading roll for 4 minutes, and press vulcanized at 148 ° C. for 45 minutes to obtain seven types of compositions ( Examples 1-2, Reference Examples 1-4 , Comparative Example 1). The following performance was evaluated for each composition, and the results are shown in Table 1.

[Mixed workability]
The materials of each blending ratio are kneaded to show the unity of the unvulcanized composition after kneading, ○ when it can be summarized without problems, × when it can not be sufficiently kneaded and is not organized Indicated.

[Tensile yield stress] [Elongation at break]
A tensile test was performed based on JIS K-6251. Since the yield stress and the 50% modulus obtained from the tensile test in Examples 1 and 2 and Reference Examples 1 to 4 are close to each other, the 50% modulus is taken as the tensile yield stress. Moreover, elongation at the time of fracture | rupture by a tensile test was made into the fracture | rupture elongation of each of Examples 1-2 and Reference Examples 1-4 .

[Shear yield stress] [History loop area]
As shown in FIG. 5, the composition 10a after kneading was rolled to a size of 25 mm wide × 25 mm long × 4.8 mm thick, and a steel plate 7b (25 mm wide) sandblasted and coated with a metal adhesive. X length 100 mm × thickness 20 mm) was laminated and then press vulcanized at 130 ° C. for 120 minutes for integration to produce Test Sample 7.

  This test sample 7 was subjected to a lap shear shear test under the following conditions using a vibrator, an input signal oscillator, and an output signal processor. Each test sample 7 was subjected to 175% strain excitation under a deformation frequency of 0.5 Hz and a measurement temperature of 23 ° C. using a biaxial shear tester, and the shear yield stress Psr and the hysteresis loop area ΔW shown in FIG. 6 were measured. . It shows that damping performance (vibration energy absorption performance) is so good that both measured value Psr and (DELTA) W are large. In Comparative Example 1, test sample 7 could not be prepared due to insufficient kneading, and measurement was impossible.

From this result, it was confirmed that Examples 1 and 2 and Comparative Examples 1 to 4 have good mixing workability, the shear yield stress Psr and the hysteresis loop area ΔW are sufficiently large, and have good damping performance. In particular, it has been clarified that a more excellent attenuation performance can be obtained by setting the mixing ratio of carbon black within a specific range .

It is a perspective view which illustrates the damping device of the present invention. It is AA sectional drawing of FIG. It is a graph which illustrates the tensile characteristic of natural rubber, trans polyisoprene, and lead. It is explanatory drawing which illustrates the installation state of the attenuation | damping apparatus of this invention. It is a side view which shows the test sample of a lap shear shear test. It is a graph which illustrates the hysteresis loop area and shear yield stress by a lap shear test.

Explanation of symbols

1 Damping device 2 Mounting plate 2a Mounting hole 3 Damping material 4 Rubber laminate (Seismic isolation rubber)
5 Structure 6 Installation surface 7 Test sample (for lap shear test)
7a Composition 7b Steel plate

Claims (3)

It consists of a damping material made of trans polyisoprene and a mounting plate that is bonded and fixed to both ends of the damping material. The trans polyisoprene is mixed with diene rubber and carbon black, and the damping material is trans polyisoprene and diene. A composition in which 40 parts by mass or more and 100 parts by mass or less of carbon black is blended with 100 parts by mass of a polymer composed of rubber, and the mass blending ratio of transpolyisoprene in the polymer is 50% or more. A damping device having a stress of 5 MPa or more and a breaking elongation of 150% or more. ^2. The attenuation device according to claim 1 , wherein the carbon black has a nitrogen adsorption specific surface area of 25 m ² / g or more and 260 m ² / g or less and a DBP oil absorption of 65 ml / 100 g or more and 150 ml / 100 g or less. The attenuation device according to claim 1 or 2 , wherein an aspect ratio of the attenuation material is 0.3 or more and 3.0 or less.

Images