Vibration suppression member

Abstract

To provide a vibration suppression member that can demonstrate an excellent vibration suppression effect as compared with a conventional product.SOLUTION: A vibration suppression member includes a receiving part and 5 to 8 support parts. The support parts include a first layer and a second layer, which are laminated. The first layer is composed of a first composition in which a styrene-based elastomer, paraffin-based process oil, an olefin-based resin, a filler material, a cross-linking agent, and a cross-linking aid agent are blended. The second layer is composed of a second composition in which a styrene-based elastomer, paraffin-based process oil, an olefin-based resin, and a hydrogenated petroleum resin are blended. The receiving part includes a mounted surface, and the support parts are mounted in a range equivalent to an area of 33-40% of an entire area of the mounted surface with the entire area as 100%.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to vibration damping materials. [Background technology]

[0002] A resin laminate constructed by laminating two different resin materials has been proposed (see, for example, Patent Document 1). According to Patent Document 1, the resin laminate exhibits high vibration damping properties and is capable of absorbing or reducing vibration and noise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-154662 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a washing machine, since the vibration caused by the rotation of the washing tub is extremely large, even if the resin laminate as described above is interposed between the legs of the washing machine and the floor, a sufficient vibration suppression effect may not be obtained. Under such a background, the present inventors have repeatedly studied ways to improve the vibration suppression effect of the vibration suppression material. As a result, they have found that an excellent vibration suppression effect can be achieved by using a material different from the resin laminate described in the above Patent Document 1 and adopting a structure different from the resin laminate described in the above Patent Document 1. The vibration suppression material described below is a vibration suppression material completed based on the above findings.

[0005] One aspect of the present disclosure is to provide a vibration-damping material that has a vibration-damping effect superior to that of conventional products. [Means for solving the problem]

[0006] One aspect of the present disclosure is a vibration suppressing material that is disposed between the legs of an equipment and an installation location when the equipment is installed at the installation location, and suppresses the transmission of vibration of the equipment to the installation location during operation of the equipment, the vibration suppressing material comprising a receiving part and 5 to 8 support parts. The receiving parts have the legs placed thereon to receive the load from the legs. The support parts are disposed at positions sandwiched between the receiving parts and the installation location, and each of the support parts supports the receiving part. The support parts have a first layer and a second layer that are laminated, and the first layer is disposed between the receiving part and the second layer. The first layer is composed of a first composition in which 400 to 500 parts by mass of paraffin-based process oil, 8 to 12 parts by mass of olefin-based resin, 15 to 25 parts by mass of a filler that is magnesium hydroxide particles, 5 to 7 parts by mass of a crosslinking agent, and 12 to 18 parts by mass of a crosslinking assistant are blended with respect to 100 parts by mass of a styrene-based elastomer. The second layer is composed of a second composition in which 100 parts by mass of a styrene-based elastomer is blended with 50 to 80 parts by mass of a paraffin-based process oil, 15 to 25 parts by mass of an olefin-based resin, and 150 to 180 parts by mass of a hydrogenated petroleum resin. The receiving part has a mounting surface to which the support part is attached. The support part is attached to an area equivalent to 33 to 40% of the total area of ​​the mounting surface, which is taken as 100%.

[0007] The vibration-suppressing material thus configured includes the receiving portion and 5 to 8 support portions as described above, and the support portions have the first and second layers as described above. Therefore, the first and second layers suppress vibrations in different frequency ranges, and an excellent vibration suppression effect is achieved. Also, since vibrations are suppressed in each of the 5 to 8 support portions, an excellent vibration suppression effect is achieved compared to the case where vibrations are suppressed by a single support portion.

[0008] In one embodiment of the present disclosure, the first layer may be a layer that exhibits a loss factor tan δ≧0.2 for vibration at a frequency A included in the frequency range of 50 to 95 Hz. In one embodiment of the present disclosure, the second layer may be a layer that exhibits a loss factor tan δ≧2.0 for vibration at a frequency B that is included in a frequency range of 30 to 70 Hz and is lower than frequency A by 5 Hz or more.

[0009] In one embodiment of the present disclosure, the mounting surface may be configured as a 100 mm x 100 mm square. The first layer may be configured as a rectangular flat plate in a plan view, with one side of the rectangle measuring 21 to 28 mm. The second layer may be configured as a rectangular flat plate in a plan view, with one side of the rectangle measuring 21 to 28 mm.

[0010] In one embodiment of the present disclosure, the first layer may be configured to have a thickness of 3 mm. The second layer may be configured to have a thickness of 8 mm. Note that the numerical values ​​of 3 mm and 8 mm in one embodiment of the present disclosure may have an error within a range that does not adversely affect the vibration damping characteristics of each layer, and are not strictly limited to 3 mm and 8 mm. For example, a thickness of about 3 mm ± 0.5 mm can be considered as a thickness of 3 mm in one embodiment of the present disclosure. Also, a thickness of about 8 mm ± 0.5 mm can be considered as a thickness of 8 mm in one embodiment of the present disclosure. [Brief description of the drawings]

[0011] [Figure 1] Fig. 1A is a perspective view of the vibration-damping member as viewed from the upper right front, and Fig. 1B is a perspective view of the vibration-damping member as viewed from the lower left rear. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, the above-mentioned vibration suppressing material will be described with reference to exemplary embodiments. [Configuration of vibration suppression material] The vibration suppressing material 1 illustrated in Figures 1A and 1B is a member that is placed between the legs of an equipment and an installation location (e.g., a floor surface) when the equipment is installed on the installation location, and suppresses the transmission of vibrations of the equipment to the installation location when the equipment is in operation. In the following explanation, the left / right, front / back, up / down directions shown in the figures will be used for explanation. Each of these directions is a relative direction defined as follows in an xyz Cartesian coordinate system: the negative x direction is left, the positive x direction is right, the negative y direction is front, the positive y direction is rear, the positive z direction is up, and the negative z direction is rear.

[0013] As shown in Figures 1A and 1B, the vibration damping material 1 comprises a receiving portion 3 and multiple (five in this embodiment) support portions 5. The receiving portion 3 is a portion on which the legs of the equipment are placed and which receives the load from the legs. In this embodiment, the receiving portion 3 is a molded product made of polypropylene. The receiving portion 3 has a square shape in plan view (the shape seen from above in the figures), and the front-to-back and left-to-right dimensions in the figures are 100 mm.

[0014] Ribs 3A are formed on the periphery of the upper surface of the receiving part 3, protruding upward. In the area surrounded by the ribs 3A on the upper surface of the receiving part 3, recesses 3B are formed that are recessed downward from the upper end position of the ribs 3A. The legs of the device are placed on the recesses 3B. As a result, even if the legs of the device and the receiving part 3 vibrate, the legs will not climb over the ribs 3A, and it is possible to prevent the legs from falling off the receiving part 3. The lower surface side of the receiving part 3 forms an attachment surface 3C to which multiple support parts 5 are attached. The receiving part 3 distributes the load applied from the device to the multiple support parts 5.

[0015] The support parts 5 are disposed at positions sandwiched between the receiving part 3 and the installation location of the equipment, and each support the receiving part 3. The support parts 5 have a first layer 5A and a second layer 5B that are laminated, and the first layer 5A is disposed between the receiving part 3 and the second layer 5B. The first layer 5A and the second layer 5B are layers that exhibit high loss coefficients for vibrations of different frequencies.

[0016] More specifically, in this embodiment, frequency A is selected from a frequency range of 60 to 95 Hz, and the first layer 5A is a layer that exhibits a loss coefficient tan δ≧0.2 for vibration of frequency A. In this embodiment, the first layer 5A has front-to-back and left-to-right dimensions of 21 to 28 mm, and a vertical dimension of 3 mm±0.5 mm.

[0017] Furthermore, frequency B is selected from a frequency range of 35 to 70 Hz and is 5 Hz or more lower than frequency A, and second layer 5B is a layer that exhibits a loss coefficient tan δ≧0.2 for vibration of frequency B. In this embodiment, second layer 5B has front-to-back and left-to-right dimensions of 21 to 28 mm, and a vertical dimension of 8 mm±0.5 mm.

[0018] By stacking the first layer 5A and the second layer 5B, which have different vibration damping characteristics, the vibration transmitted from the receiving portion 3 can be attenuated first by the first layer 5A. Furthermore, the vibration that cannot be absorbed by the first layer 5A and the vibration of the resonant frequency generated in the first layer 5A can be attenuated by the second layer 5B.

[0019] In order to achieve such vibration damping characteristics, the first layer 5A is composed of a first composition in which 100 parts by mass of a styrene-based elastomer is blended with 400 to 500 parts by mass of paraffin-based process oil, 8 to 12 parts by mass of an olefin-based resin, 15 to 25 parts by mass of a filler which is magnesium hydroxide particles, 5 to 7 parts by mass of a cross-linking agent, and 12 to 18 parts by mass of a cross-linking assistant.

[0020] The styrene-based elastomer is an elastomer material composed of polystyrene and blocks of ethylene, propylene, butylene, etc., and examples thereof include SEPTON 4055, SEPTON 4077, and SEPTON 4099 manufactured by Kuraray Co., Ltd. The process oil is a component that affects the hardness and compression set value of the elastomer, and examples thereof include PW-32, PW-380, and PS-430 manufactured by Idemitsu Kosan Co., Ltd. By making the amount of process oil 400 parts by mass or more, it is possible to impart durability (long-term reliability) to the elastomer. Furthermore, by making the amount of process oil 500 parts by mass or less, it is possible to prevent the compression set value from becoming excessive, and to make the first layer 5A less likely to sag. Furthermore, by making the amount of process oil 500 parts by mass or less, it is possible to prevent the hardness of the first layer 5A from increasing, and also to prevent the occurrence of oil bleeding.

[0021] The olefin resin is a component that affects the dispersibility of the material. The olefin resin may be a copolymer of ethylene, propylene, butene, etc., but for styrene-based elastomers, polypropylene is preferably used. As the olefin resin, for example, J2021GR, J226UM, etc. manufactured by Prime Polymer Co., Ltd. can be used. By making the blending amount of the olefin resin 8 parts by mass or more, the dispersibility of the material is improved, and as a result, the durability (long-term reliability, heat resistance, etc.) of the elastomer is improved. In addition, by making the blending amount of the olefin resin 12 parts by mass or less, the releasability can be improved.

[0022] The filler, which is magnesium hydroxide particles, affects the hardness, compression set, and flame retardancy of the elastomer. As the magnesium hydroxide particles, it is preferable to use those surface-treated with higher fatty acids such as stearic acid and oleic acid. An example of such a filler is Magseeds N / N-4 (particle size (D50): 0.5 to 1.5 μm) manufactured by Konoshima Chemical Co., Ltd. By making the amount of the filler 15 parts by mass or more, it is possible to impart good flame retardancy and suppress the occurrence of oil bleeding. Furthermore, by making the amount of the filler 25 parts by mass or less, it is possible to suppress the compression set value from becoming excessive, and to make the first layer 5A less likely to become sagging. Furthermore, by making the amount of the filler 25 parts by mass or less, it is possible to suppress the hardness of the first layer 5A from increasing.

[0023] The crosslinking agent is preferably an organic peroxide-based crosslinking agent, which forms crosslinking points in the styrene-based elastomer. By making the amount of the crosslinking agent 5 parts by mass or more, the durability (long-term reliability, heat resistance, etc.) of the elastomer is improved. In addition, by making the amount of the crosslinking agent 7 parts by mass or less, the increase in hardness can be suppressed and moldability can be improved.

[0024] The crosslinking aid is a component that promotes crosslinking of the elastomer, increasing the crosslink density. The crosslink density affects the heat resistance as well as the mechanical properties of the elastomer. By making the amount of the crosslinking aid 12 parts by mass or more, the durability (long-term reliability, heat resistance, etc.) of the elastomer is improved. In addition, by making the amount of the crosslinking aid 18 parts by mass or less, the increase in hardness can be suppressed and moldability can be improved.

[0025] By forming the first layer 5A from the first composition in which the components are blended in such a blending ratio, it is possible to form the first layer 5A having the desired vibration damping properties. In addition to the above-mentioned main components, the first composition may contain other components such as various processing aids within a range that does not impair the vibration damping properties of the first layer 5A. Examples of processing aids include antioxidants, weather resistance agents (ultraviolet absorbing agents, light stabilizers), release agents, viscosity modifiers, colorants, etc.

[0026] The second layer 5B is made of a second composition in which 100 parts by mass of a styrene-based elastomer, 50 to 80 parts by mass of a paraffin-based process oil, 15 to 25 parts by mass of an olefin-based resin, and 150 to 180 parts by mass of a hydrogenated petroleum resin are blended.

[0027] The styrene-based elastomer and the paraffin-based process oil may be the same as those constituting the first layer 5 A. The olefin-based resin may be, for example, Hiwax / 200P manufactured by Mitsui Chemicals, Inc.

[0028] The hydrogenated petroleum resin imparts adhesion to the elastomer. The hydrogenated petroleum resin affects the viscoelasticity of the elastomer, and as a result, affects the vibration characteristics. By making the amount of hydrogenated petroleum resin 150 parts by mass or more, it is possible to impart the desired viscoelasticity and obtain sufficient vibration characteristics. In addition, by making the amount of hydrogenated petroleum resin 180 parts by mass or less, it is possible to ensure good releasability.

[0029] By forming the second layer 5B from the second composition in which the components are blended in such a blending ratio, it is possible to form the second layer 5B having the desired vibration damping properties. In addition to the above-mentioned main components, the second composition may also contain other components such as various processing aids within a range that does not impair the vibration damping properties of the second layer 5B, as in the case of the first layer 5A.

[0030] [Examples of vibration suppression material manufacturing] A first composition was prepared by mixing the components shown in Table 1 below in the mixing ratio shown in the table, and the first composition was molded into a sheet having a thickness of 3 mm (3 mm±0.5 mm) to become the first layer 5A.

[0031] [Table 1]

[0032] In addition, a second composition was prepared by mixing the components shown in Table 2 below in the mixing ratio shown in the table, and the second composition was molded into a sheet having a thickness of 8 mm (8 mm±0.5 mm) to become the second layer 5B.

[0033] [Table 2]

[0034] These two sheets were laminated together, and a laminate having the required dimensions corresponding to the support part 5 was cut out from the laminate. The cut-out laminate was attached to the mounting surface 3C of the receiving part 3 to produce vibration damping materials corresponding to the examples and comparative examples.

[0035] [Examples and Comparative Examples of Vibration Suppression Materials] Next, examples and comparative examples of vibration suppressing materials will be described. <Example 1> The vibration damping material of Example 1 was produced with the left-right and front-rear dimensions of the first layer 5A and the second layer 5B being 27 mm, the thickness of the first layer 5A being 3 mm±0.5 mm, the thickness of the second layer 5B being 8 mm±0.5 mm, and the number of support portions 5 being five. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 78 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 51 Hz±10 Hz.

[0036] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 27 mm x 27 mm = 729 mm 2 The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 729 mm 2 ×5=3645mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 3645 mm 2 ÷10000mm 2 ×100=36.45%.

[0037] <Example 2> The vibration damping material of Example 2 was produced by setting the left-right and front-rear dimensions of the first layer 5A and the second layer 5B to 26 mm, the thickness of the first layer 5A to 3 mm±0.5 mm, the thickness of the second layer 5B to 8 mm±0.5 mm, and the number of support portions 5 to five. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 72 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 48 Hz±10 Hz.

[0038] The coverage area of ​​the mounting surface 3C covered by one support part 5 is 26 mm x 26 mm = 676 mm 2 The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 676 mm 2 ×5=3380mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 3380 mm 2 ÷10000mm 2 ×100=33.8%.

[0039] <Example 3> The vibration damping material of Example 3 was produced by setting the left-right and front-rear dimensions of the first layer 5A and the second layer 5B to 28 mm, the thickness of the first layer 5A to 3 mm±0.5 mm, the thickness of the second layer 5B to 8 mm±0.5 mm, and the number of support portions 5 to five. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 83 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 55 Hz±10 Hz.

[0040] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 28 mm x 28 mm = 784 mm 2 The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 784 mm 2 ×5=3920mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 3920 mm 2 ÷10000mm 2 ×100=39.2%.

[0041] <Example 4> The vibration damping material of Example 4 was produced with the left-right and front-rear dimensions of the first layer 5A and the second layer 5B being 24 mm, the thickness of the first layer 5A being 3 mm±0.5 mm, the thickness of the second layer 5B being 8 mm±0.5 mm, and the number of support portions 5 being six. The first layer 5A configured in this shape is a layer that exhibits a loss factor tanδ≧0.2 for vibration of 65 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tanδ≧2.0 for vibration of 44 Hz±10 Hz.

[0042] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 24 mm x 24 mm = 576 mm2 The coverage area of ​​the mounting surface 3C covered by the six support parts 5 is 576 mm 2 ×6=3456mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the six supporting parts 5 is 3456 mm 2 ÷10000mm 2 ×100=34.56%.

[0043] <Example 5> The vibration damping material of Example 5 was produced with the left-right and front-rear dimensions of the first layer 5A and the second layer 5B being 21 mm, the thickness of the first layer 5A being 3 mm±0.5 mm, the thickness of the second layer 5B being 8 mm±0.5 mm, and the number of support parts 5 being eight. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 60 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 42 Hz±10 Hz.

[0044] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 21 mm x 21 mm = 441 mm 2 The coverage area of ​​the mounting surface 3C covered by the eight support parts 5 is 441 mm 2 ×8=3528mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the eight support parts 5 is 3528 mm 2 ÷10000mm 2 ×100=35.28%.

[0045] <Comparative Example 1> The vibration damping material of Comparative Example 1 was produced by setting the left-right and front-rear dimensions of the first layer 5A and the second layer 5B to 25 mm, the thickness of the first layer 5A to 3 mm±0.5 mm, the thickness of the second layer 5B to 8 mm±0.5 mm, and the number of support portions 5 to five. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 62 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 43 Hz±10 Hz.

[0046] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 25 mm x 25 mm = 625 mm 2 The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 625 mm 2 ×5=3125mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 3125 mm 2 ÷10000mm 2 ×100=31.25%.

[0047] <Comparative Example 2> The vibration damping material of Comparative Example 2 was produced by setting the left-right and front-rear dimensions of the first layer 5A and the second layer 5B to 30 mm, the thickness of the first layer 5A to 3 mm±0.5 mm, the thickness of the second layer 5B to 8 mm±0.5 mm, and the number of support portions 5 to five. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 89 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 56 Hz±10 Hz.

[0048] The coverage area of ​​the mounting surface 3C covered by one support part 5 is 30 mm x 30 mm = 900 mm 2 The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 900 mm 2 ×5=4500mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 4500 mm 2 ÷10000mm 2 ×100=45%.

[0049] <Comparative Example 3> The vibration damping material of Comparative Example 3 was produced by setting the left-right and front-rear dimensions of the first layer 5A and the second layer 5B to 60 mm, the thickness of the first layer 5A to 3 mm±0.5 mm, the thickness of the second layer 5B to 8 mm±0.5 mm, and the number of support parts 5 to one. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 96 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 51 Hz±10 Hz.

[0050] The coverage area of ​​the mounting surface 3C covered by one support part 5 is 60 mm x 60 mm = 3600 mm 2 The value is for the coverage area of ​​Example 1, 3645 mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm. 2 Therefore, the coverage of the mounting surface 3C by one support part 5 is 3600 mm 2 ÷10000mm 2 ×100=36%.

[0051] <Comparative Example 4> The vibration damping material of Comparative Example 4 was produced by setting the left-right and front-rear dimensions of the first layer 5A and the second layer 5B to 30 mm, the thickness of the first layer 5A to 3 mm±0.5 mm, the thickness of the second layer 5B to 8 mm±0.5 mm, and the number of support parts 5 to four. The first layer 5A configured in this shape is a layer that exhibits a loss factor tan δ≧0.2 for vibration of 77 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tan δ≧2.0 for vibration of 62 Hz±10 Hz.

[0052] The coverage area of ​​the mounting surface 3C covered by one support part 5 is 30 mm x 30 mm = 900 mm 2The coverage area of ​​the mounting surface 3C covered by the four support parts 5 is 900 mm 2 ×4=3600mm 2 The value is for the coverage area of ​​Example 1, 3645 mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm. 2 Therefore, the coverage of the mounting surface 3C by the four supporting parts 5 is 3600 mm 2 ÷10000mm 2 ×100=36%.

[0053] <Comparative Example 5> The first layer 5A and the second layer 5B have left-right and front-rear dimensions of 27 mm, the thickness of the first layer 5A is 3 mm±0.5 mm, the thickness of the second layer 5B is 8 mm±0.5 mm, and the number of support parts 5 is 5, which are the same as in Example 1. However, the lamination order of the first layer 5A and the second layer 5B is reversed to produce a vibration damping material of Comparative Example 5. The first layer 5A configured in this shape is a layer that exhibits a loss factor tanδ≧0.2 for vibration of 73 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tanδ≧2.0 for vibration of 49 Hz±10 Hz.

[0054] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 27 mm x 27 mm = 729 mm 2 The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 729 mm 2 ×5=3645mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 3645 mm 2 ÷10000mm 2 ×100=36.45%.

[0055] <Comparative Example 6> The first layer 5A and the second layer 5B had left-right and front-rear dimensions of 27 mm, the thickness of the first layer 5A was 3 mm±0.5 mm, the thickness of the second layer 5B was 8 mm±0.5 mm, and the number of support parts 5 was 5, which were the same as in Example 1. However, both the first layer 5A and the second layer 5B were made of the first composition, which was the constituent material of the first layer 5A, to produce the vibration damping material of Comparative Example 6. The first layer 5A configured in this shape is a layer that exhibits a loss factor tanδ≧0.2 for vibration of 73 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tanδ≧0.2 for vibration of 18 Hz±10 Hz.

[0056] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 27 mm x 27 mm = 729 mm 2 The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 729 mm 2 ×5=3645mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 3645 mm 2 ÷10000mm 2 ×100=36.45%.

[0057] <Comparative Example 7> The first layer 5A and the second layer 5B had left-right and front-rear dimensions of 27 mm, the thickness of the first layer 5A was 3 mm±0.5 mm, the thickness of the second layer 5B was 8 mm±0.5 mm, and the number of support parts 5 was 5, which were the same as in Example 1. However, both the first layer 5A and the second layer 5B were made of the second composition, which was the constituent material of the second layer 5B, to produce the vibration damping material of Comparative Example 7. The first layer 5A configured in this shape is a layer that exhibits a loss factor tanδ≧2.0 for vibration of 196 Hz±10 Hz. The second layer 5B configured in this shape is a layer that exhibits a loss factor tanδ≧2.0 for vibration of 49 Hz±10 Hz.

[0058] The coverage area of ​​the mounting surface 3C covered by one support portion 5 is 27 mm x 27 mm = 729 mm 2The coverage area of ​​the mounting surface 3C covered by the five support parts 5 is 729 mm 2 ×5=3645mm 2 The area of ​​the mounting surface 3C is 100 mm × 100 mm = 10,000 mm 2 Therefore, the coverage of the mounting surface 3C by the five supporting parts 5 is 3645 mm 2 ÷10000mm 2 ×100=36.45%.

[0059] [Performance test] A performance test was carried out to verify the vibration suppression effect for the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 3. The measurement method was to measure the vibration during spin-drying of the washing machine from the start of spin-drying until steady rotation was reached. The vibration measurement conditions were as follows: a commercially available FFT analyzer was used as the measuring device, a three-axis piezoelectric acceleration transducer was used as the accelerometer, the measurement frequency was in the range of 1 to 1000 Hz, and the measurement point was on the floor 6 cm away from the right front leg of the washing machine.

[0060] Under the above conditions, the vibration acceleration A0 was measured when no vibration-suppressing material was used. In addition, the vibration acceleration A1 was measured when the vibration-suppressing materials of Examples 1 to 5 and Comparative Examples 1 to 3 were used. Based on these measurement results, the vibration reduction rate (%) = (A0-A1) / A0 x 100 was calculated. The vibration reduction rate was evaluated as follows: if it was 25% or more, it was rated AA, if it was 20% or more and less than 25%, it was rated A, and the ratings of AA and A were considered to be acceptable. If it was less than 20%, it was rated B, if it was impossible to measure, it was rated C, and the ratings of B and C were considered to be unacceptable. The test results are shown in Table 3.

[0061] [Table 3]

[0062] The vibration-suppressing materials of Examples 1 to 5 all exhibited a vibration reduction rate of 20% or more, suggesting that they have an excellent vibration-suppressing effect. In particular, the vibration-suppressing materials of Examples 1, 4, and 5 all exhibited a vibration reduction rate of 25% or more, suggesting that they have a particularly excellent vibration-suppressing effect.

[0063] In the vibration damping materials of Comparative Examples 1 and 2, the number of support parts 5 is the same as in Examples 1 to 3, but Comparative Example 1 is an example in which the size of the support parts 5 is smaller than in Example 2, and Comparative Example 2 is an example in which the size of the support parts 5 is larger than in Example 3. Therefore, when the number of support parts 5 is five, it is presumed that there is a suitable numerical range for the size of the support parts 5, and that it is meaningful to select the size of the support parts 5 within that numerical range.

[0064] The vibration-damping materials of Comparative Examples 3 and 4 are examples in which the coverage rate is close to that of Example 1. However, the number of support parts 5 is different from that of Example 1, which caused the evaluation to fail. From this, it was presumed that an excellent vibration-damping effect would be achieved if the number of support parts 5 was five or more. Taking into consideration the evaluations of Examples 4 and 5, it is expected that the desired vibration-damping effect will be achieved by setting the number of support parts 5 to between five and eight.

[0065] The vibration damping material of Comparative Example 5 is an example in which the stacking order of the first layer 5A and the second layer 5B is reversed. When the stacking order of the first layer 5A and the second layer 5B is reversed, the vibration reduction rate is reduced and the desired vibration damping effect cannot be obtained. Therefore, it is suggested that the stacking order of the first layer 5A and the second layer 5B is also significant.

[0066] The vibration-damping materials of Comparative Examples 6 and 7 are examples in which the support portion 5 is made of a layer of the same material as the first layer 5A, and examples in which the support portion 5 is made of a layer of the same material as the second layer 5B. Even when such configurations are adopted, the vibration reduction rate decreases or becomes unmeasurable, and the desired vibration-damping effect cannot be obtained.

[0067] [Other embodiments] Although the vibration damping material has been described above by way of exemplary embodiments, the above-mentioned embodiments are merely exemplified as one aspect of the present disclosure. In other words, the present disclosure is not limited to the above-mentioned exemplary embodiments, and can be embodied in various forms without departing from the technical concept of the present disclosure.

[0068] For example, in the above embodiment, the receiving portion 3 is provided with the rib 3A, but it is optional whether or not to provide the rib 3A. In the above embodiment, the support part 5 includes the first layer 5A and the second layer 5B, but another layer may be laminated below the second layer 5B. Alternatively, another layer may be laminated above the recess 3B of the receiving part 3.

[0069] In the above embodiment, the receiving portion 3 is described as being made of polypropylene, but the receiving portion 3 may be made of any member that is hard enough to distribute the load of the device to the multiple support portions 5, and the material is not limited to polypropylene. For example, the receiving portion 3 may be made of other hard plastic materials such as polyamide. Alternatively, the receiving portion 3 may be made of a material other than plastic, such as a metal material.

[0070] In the above embodiment, a washing machine is exemplified as a device that generates vibrations, but the vibration suppressing material may be configured for devices other than washing machines. Examples of devices other than washing machines include pumps, devices with built-in pumps (e.g., compressors), motors, devices with built-in motors (e.g., fans and outdoor units of air conditioners), generators, etc.

[0071] Note that multiple functions realized by one component exemplified in the above embodiment may be realized by multiple components. One function realized by one component exemplified in the above embodiment may be realized by multiple components. Multiple functions realized by multiple components exemplified in the above embodiment may be realized by one component. One function realized by multiple components exemplified in the above embodiment may be realized by one component. Part of the configuration exemplified in the above embodiment may be omitted.

[0072] [Technical idea disclosed in this specification] [Item 1] A vibration suppressing material that is disposed between a leg of an equipment and an installation location when the equipment is installed at the installation location, and suppresses transmission of vibration of the equipment to the installation location when the equipment is operated, a receiving portion on which the leg is placed and which receives a load from the leg; Five to eight support parts are arranged at positions between the receiving part and the installation location, and each support part supports the receiving part; Equipped with The support portion has a first layer and a second layer stacked together, the first layer being disposed between the receiving portion and the second layer; the first layer is constituted by a first composition in which 100 parts by mass of a styrene-based elastomer is mixed with 400 to 500 parts by mass of a paraffin-based process oil, 8 to 12 parts by mass of an olefin-based resin, 15 to 25 parts by mass of a filler which is magnesium hydroxide particles, 5 to 7 parts by mass of a crosslinking agent, and 12 to 18 parts by mass of a crosslinking assistant; the second layer is composed of a second composition in which 50 to 80 parts by mass of paraffin-based process oil, 15 to 25 parts by mass of an olefin-based resin, and 150 to 180 parts by mass of a hydrogenated petroleum resin are blended with 100 parts by mass of a styrene-based elastomer, The receiving portion has a mounting surface to which the support portion is attached, The support portion is attached to a range corresponding to 33 to 40% of the total area of ​​the mounting surface, where the total area of ​​the mounting surface is 100%. Vibration suppressing material.

[0073] [Item 2] The vibration damping material according to item 1, The first layer is a layer that exhibits a loss factor tanδ≧0.2 for vibration at a frequency A included in a frequency range of 50 to 95 Hz. Vibration suppressing material.

[0074] [Item 3] Item 2. A vibration damping material comprising: The second layer is a layer that exhibits a loss factor tanδ≧2.0 with respect to vibration at a frequency B that is included in a frequency range of 30 to 70 Hz and is 5 Hz or more lower than the frequency A. Vibration suppressing material.

[0075] [Item 4] A vibration damping material according to any one of items 1 to 3, The mounting surface is configured as a square of 100 mm x 100 mm, The first layer is configured in a rectangular plate shape in a plan view, and one side of the rectangle is configured to be 21 to 28 mm, The second layer is configured in a rectangular plate shape in a plan view, and one side of the rectangle is configured to be 21 to 28 mm. Vibration suppressing material.

[0076] [Item 5] A vibration damping material according to any one of items 1 to 4, The first layer is configured to a thickness of 3 mm; The second layer is configured to a thickness of 8 mm; Vibration suppressing material. [Explanation of symbols]

[0077] 1... Vibration suppressing material, 3... Receiving part, 3A... Rib, 3B... Recess, 3C... Mounting surface, 5... Supporting part, 5A... First layer, 5B... Second layer.

Claims

1. A vibration suppressing material that is disposed between a leg of an equipment and an installation location when the equipment is installed at the installation location, and suppresses transmission of vibration of the equipment to the installation location when the equipment is operated, a receiving portion on which the leg is placed and which receives a load from the leg; Five to eight support parts are arranged at positions between the receiving part and the installation location, and each support part supports the receiving part; Equipped with The support portion has a first layer and a second layer stacked together, the first layer being disposed between the receiving portion and the second layer; the first layer is constituted by a first composition in which 100 parts by mass of a styrene-based elastomer is blended with 400 to 500 parts by mass of a paraffin-based process oil, 8 to 12 parts by mass of an olefin-based resin, 15 to 25 parts by mass of a filler which is magnesium hydroxide particles, 5 to 7 parts by mass of a crosslinking agent, and 12 to 18 parts by mass of a crosslinking assistant; the second layer is constituted by a second composition in which 50 to 80 parts by mass of paraffin-based process oil, 15 to 25 parts by mass of an olefin-based resin, and 150 to 180 parts by mass of a hydrogenated petroleum resin are blended with respect to 100 parts by mass of a styrene-based elastomer, The receiving portion has a mounting surface to which the support portion is attached, The support portion is attached to a range corresponding to 33 to 40% of the total area of ​​the mounting surface, where the total area of ​​the mounting surface is 100%. Vibration suppressing material.

2. The vibration damping material according to claim 1, The first layer is a layer exhibiting a loss factor tan δ ≧ 0.2 for vibration at a frequency A included in a frequency range of 50 to 95 Hz; Vibration suppressing material.

3. The vibration damping material according to claim 2, The second layer is a layer that exhibits a loss factor tan δ ≧ 2.0 with respect to vibration at a frequency B that is included in a frequency range of 30 to 70 Hz and is 5 Hz or more lower than the frequency A. Vibration suppressing material.

4. A vibration damping material according to any one of claims 1 to 3, The mounting surface is configured as a square of 100 mm x 100 mm, The first layer is configured in a rectangular plate shape in a plan view, and one side of the rectangle is configured to be 21 to 28 mm, The second layer is configured in a rectangular plate shape in a plan view, and one side of the rectangle is configured to be 21 to 28 mm. Vibration suppressing material.

5. The vibration damping material according to claim 4, The first layer is configured to have a thickness of 3 mm; The second layer is configured to a thickness of 8 mm. Vibration suppressing material.

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