JPH11270619A - Damping member and unit building using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide damping members with an excellent damping property in the purpose using a light load, and to provide a unit building composed by providing neighboring building units, which has an excellent damping property, never sways the building unit itself, and never sinks the floor, when a parson walks. SOLUTION: This damping member is composed by laminating a high polymer sheet having the shearing elasticy of 0.1 to 30 MPa at 20 deg.C and 60 Hz, and the loss tangent of 0.2 to 2.0 at 20 deg.C and 10 to 500 Hz; and a metal sheet having the Young's modulous of 1.0×10<11> to 4.5×10<11> N/m<2> ; alternately, and making the high polymer sheets in both outer layers, and the total thickness of the high polymer sheets is 50 to 90% of the thickness of the damping member, while the thickness of the metal sheet is 20 to 100% of the thickness of the high polymer sheets. In this unit building composed by providing neighboring building units whose beams of the floors are composed of wooden system members, the above damping member is held between the beams of the floors of the neighboring building units.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vibration damping material and a unit building using the same.

[0002]

2. Description of the Related Art Recently, unit buildings have been actively built because they have advantages such as short construction period and excellent seismic resistance. However, unit buildings are made of steel frames or wooden members. There is a drawback that vibrations generated inside and outside the building are easily transmitted because the building units are joined and walls and floors are added.

In order to reduce the vibration, Japanese Patent Laid-Open No.
No. 194230 discloses that between building units formed of steel frames, a flange of a girder forming one floor structure and a flange of a girder forming the other floor structure,
Unit buildings that are joined to each other at portions corresponding to the beam fixing portions in the longitudinal direction have been proposed.

Although this structure has an effect of reducing floor impact noise and floor vibration, it has a low effect of reducing low-frequency impact sound, and the building unit itself shakes or the floor sinks when a person walks. there were.

[0005] On the other hand, many proposals have been made on vibration damping materials, but they are used for heavy loads such as buildings and bridges, and are not suitable for low load applications. For example, Japanese Patent Application Laid-Open No. 8-93845 describes a composite laminate in which a plurality of rigid plates having rigidity and a plurality of soft plates having viscoelastic properties are alternately laminated as a light-load seismic isolation structure. I have.

However, since this structure is also used at a position where a load is applied to a detached house, a vibration damping material for a light load application such as used between beams on the floor of an adjacent building unit is used. Could not be used as.

[0007]

SUMMARY OF THE INVENTION In view of the above drawbacks, an object of the present invention is to provide a vibration-damping material having excellent vibration-damping properties in light-load applications, and to provide a vibration-damping material that is excellent in vibration-damping properties and can be used when a person walks. Another object of the present invention is to provide a unit building that is constructed by arranging building units adjacent to each other without causing the building units to shake or the floor to sink.

[0008]

According to a first aspect of the present invention, there is provided a vibration damping material having a shear modulus at 20 ° C. and 60 Hz of 0.1 to 30 M.
Pa, a polymer sheet having a loss tangent of 0.2 to 2.0 at 10 to 500 Hz at 20 ° C, and a Young's modulus of 1.
A vibration damping material in which metal sheets of 0 × 10 ^{11 to} 4.5 × 10 ¹¹ N / m ² are alternately laminated so that polymer sheets are formed on both outer layers. The thickness is 50 to 90% of the thickness of the damping material, and the thickness of the metal sheet is 20 to 100% of the thickness of the polymer sheet.

The shear modulus at 20 ° C. and 60 Hz of the above polymer sheet is 0.1 to 30 MPa, since it becomes too soft when it is too small to hold it, and when it is too large, it becomes hard and the vibration damping property is reduced. Is 0.1-2
5 MPa.

Also, the loss tangent at 10 ° C. to 500 Hz at 20 ° C. is lower than 0.2 to
2.0, and preferably 0.3 to 2.0.

The polymer sheet may be a sheet having the above-mentioned physical properties and made of a polymer, but the polymer is preferably an acrylic polymer.

As the acrylic polymer, any conventionally known polymer can be used.
Polymerization comprising 82 to 95 parts by weight of an alkyl (meth) acrylate having an alkyl group of 4, 18 to 5 parts by weight of a vinyl monomer copolymerizable with the alkyl (meth) acrylate, and 0.03 to 3 parts by weight of a photoradical initiator. A polymer obtained by photopolymerizing a hydrophilic composition is preferably used.

The above-mentioned alkyl (meth) acrylate has an alkyl group having 1 to 14 carbon atoms and is, for example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate. ) Acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, isomyristyl (meth) acrylate, etc.
Alkyl (meth) acrylates having 12 alkyl groups are preferred, with butyl acrylate and 2-ethylhexyl acrylate being particularly preferred. The above alkyl (meth) acrylates may be used alone or in combination of two or more.

The vinyl monomer is not particularly limited as long as it is a vinyl monomer copolymerizable with the alkyl (meth) acrylate. Examples of the vinyl monomer include (meth) acrylic acid,
(Meth) acrylamide, carboxyethyl acrylate, isobonyl (meth) acrylate, alkoxyalkyl acrylate, vinylpyrrolidone, (meth) acrylonitrile, acryloyl morphylin and the like,
(Meth) acrylic acid, vinylpyrrolidone and (meth) acrylamide are preferred.

As the photo-radical initiator, general initiators conventionally used in photopolymerization can be used, such as 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, acetophenone-based photo-radical initiators such as α-hydroxy-α, α′-dimethylacetophenone, methoxyacetophenone, 2,2 dimethoxy-2-phenylacetone, 2-hydroxy-2-cyclohexyl acetophenone; ketal-based photoradical initiators such as benzyldimethyl ketal; halogen Ketone, acylphosphinoxide, acylphosphonate and the like.

The acrylic polymer is a polymer obtained by photopolymerizing a polymerizable composition comprising the alkyl (meth) acrylate and a vinyl monomer copolymerizable with the alkyl (meth) acrylate. If the ratio of the (meth) acrylate and the vinyl monomer is not a specific ratio, the vibration damping property is reduced. Therefore, the alkyl (meth) acrylate is 82 to 95 parts by weight, and the vinyl monomer is 18 to 5 parts by weight.

On the other hand, if the amount of the photo-radical initiator is too small, the photopolymerization does not proceed sufficiently. If the amount is too large, the acrylic polymer becomes soft and the vibration damping property is reduced.
03 to 3 parts by weight.

As the method of photopolymerizing the polymerizable composition, any conventionally known method may be employed. For example, the polymerizable composition is coated on release paper, and a mercury lamp, chemical lamp, black light lamp, metal halide, or the like is used. 400 such as lamps
Polymerization by irradiating light with a lamp capable of emitting light having a wavelength of nm or less can be mentioned. Light intensity is 0.1
１００100 mW / cm ² is preferred.

Since the polymerization is inhibited if oxygen is present during the polymerization, it is preferable to carry out the polymerization after removing the oxygen. Examples of the method of removing oxygen include a method of performing polymerization in an inert gas atmosphere, a method of laminating a transparent release paper on the polymerizable composition layer, and the like.

The photopolymerizable composition may further contain a tackifier resin, a thickener, a bulking agent, a filler, a thixotropic agent, and the like. Examples of the tackifying resin include a rosin resin, a modified rosin resin, a terpene resin, a terpene phenol resin, an aromatic modified terpene resin, a petroleum resin, a hydrogenated petroleum resin, and the like. It is preferably used.

Examples of the thickener include acrylic rubber,
Examples include epichlorohydrin rubber, isoprene rubber, butyl rubber, and the like, and examples of the extender include calcium carbonate, titanium oxide, and clay. Examples of the filler include glass balloon, alumina balloon, ceramic balloon, shirasu balloon, vinylidene chloride, acrylic balloon, mica, nylon bead, acrylic bead, silicon bead, polyethylene bead, polyester fiber, rayon fiber, and nylon fiber. can give.

As the Young's modulus of the metal sheet decreases, the rigidity decreases, and when the Young's modulus increases, the vibration damping property decreases.
1.0 × 10 ^{11 to} 4.5 × 10 ¹¹ N / m ² . Any metal sheet having the above Young's modulus may be used, and examples thereof include an aluminum-plated steel sheet, a galvanized steel sheet, a zinc-coated steel sheet, an iron plate, a stainless steel plate, a copper plate, a zinc plate, and a lead plate.

The above-mentioned polymer sheet and metal sheet are alternately laminated so that the polymer sheet becomes both outer layers. Preferably, two or more metal sheets and three or more polymer sheets are stacked.

If the total thickness of the polymer sheet in the vibration damping material is reduced, the damping property is reduced, and if the total thickness is increased, the rigidity is reduced and walking feeling is reduced. 50 to 90%.

The thickness of the polymer sheet is preferably 0.2 to 2 mm because the thinner the sheet, the lower the vibration damping property, and the thicker the sheet, the greater the shear deformation and the floor vibration. If the thickness of the metal sheet is too thin relative to the polymer sheet, the rigidity will decrease,
If the thickness is too large, the vibration damping performance deteriorates, so that the thickness is set to 20 to 100% of the polymer sheet.

According to a second aspect of the present invention, there is provided a unit building in which building units made of wooden members are arranged adjacent to each other on the floor, wherein the floor unit has a beam between the floor beams of the adjacent building units. The vibration damping material according to claim 1, 2 or 3 is sandwiched.

The above-mentioned unit building is a conventionally known unit building in which a plurality of building units each having a substantially rectangular parallelepiped beam are arranged adjacent to each other, and at least the beams on the floor of the building unit are made of wood.

The damping material is sandwiched between the beams on the floor of the adjacent building unit so that the polymer sheet is in contact with the beams. Is preferably sandwiched between the beams on the floor.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to examples.

Examples 1 and 2, Comparative Examples 1 to 6 A predetermined amount of 2-ethylhexyl acrylate, acrylic acid and a photopolymerization initiator (2,2 dimethoxy-2-phenylacetone) shown in Table 1 were supplied to a separable flask. Then, the mixture was stirred until it was uniformly dispersed, and then replaced with nitrogen. Next, ultraviolet rays were irradiated with a black light lamp to partially polymerize the reaction system until the temperature of the reaction system increased by 5 ° C.

After adding 0.05 parts by weight of hexanediol diacrylate to the partially polymerized composition, the composition is applied to a release-treated polyester film having a thickness of 38 μm, and the same polyester film is further applied thereon. The layers were laminated and irradiated with light for 8 minutes at an irradiation intensity of 1 mw / cm ² using a chemical lamp to obtain a polymer sheet having a thickness of 1 mm.

The obtained three polymer sheets and the two metal sheets shown in Table 1 were alternately laminated so that the polymer sheets were formed on both outer layers, thereby obtaining a five-layer vibration damping material. Table 1 shows the total thickness ratio of the polymer sheet to the thickness of the vibration damping material and the thickness ratio of the metal sheet to the thickness of the polymer sheet. Further, the obtained vibration damping material was used to measure the vibration damping property and the amount of distortion. The results are shown in Table 1.

The method of measuring the vibration damping property and the amount of distortion is as follows. Vibration damping test A damping material having a width of 50 mm and a length of 1000 mm was placed on two Rawan plates (width 50 mm, length 1200 mm, Young's modulus 6 ×).
At 10 ⁹ N / m ² ), the polymer sheet was sandwiched so as to be in contact with the Lauan material plate, and was pressed twice back and forth with a 5 kg roll.
The test piece for measurement was obtained by being left for 72 hours.

The impulse hammer method (JIS A 63)
22), the test piece was vibrated from the side (the surface on which both the damping material and the Lauan material plate exist), and the resonance frequency was 63
The loss coefficient at Hz was determined. The vibration damping property needs to be 0.1 or more. If the vibration damping property is smaller than 0.1, improvement in sound insulation in a low frequency region cannot be expected.

Strain amount test The other Lauan material plate was fixed so that one of the Rawan material plates of the test piece obtained in the vibration suppression test protruded to the side and the length direction became horizontal, and 5 kgf Was vertically dropped from a height of 30 cm, and the amount of distortion at that time was measured. The smaller the amount of distortion, the better the walkability. If it exceeds 0.8 mm, the floor will sink during walking.

[0036]

[Table 1]

[0037]

The structure of the vibration damping material of the present invention is as described above. Therefore, the vibration damping material is excellent in a light load application. It has excellent vibration and does not shake or the floor sinks when walking.

Claims (4)

[Claims] 1. Shear modulus at 20 ° C. and 60 Hz is 0.
A polymer sheet having a loss tangent of 0.2 to 2.0 at 10 to 500 Hz at 20 ° C. and a Young's modulus of 1.0 × 10 ^{11 to} 4.5 × 10 ¹¹ N / m ^{2 is} a vibration damping material in which the metal sheets are alternately stacked so that the polymer sheets become both outer layers, and the total thickness of the polymer sheets is 50 to 90% of the thickness of the vibration damping material. A damping material, wherein the thickness of the metal sheet is 20 to 100% of the thickness of the polymer sheet. 2. The vibration damping material according to claim 1, wherein the polymer sheet is an acrylic polymer sheet. 3. The acrylic polymer has 1 to 14 carbon atoms.
Alkyl (meth) acrylate having an alkyl group of 8
A polymer obtained by photopolymerizing a polymerizable composition comprising 2 to 95 parts by weight, 18 to 5 parts by weight of a vinyl monomer copolymerizable with the alkyl (meth) acrylate, and 0.03 to 3 parts by weight of a photoradical initiator. 3. The damping material according to claim 2, wherein: 4. A unit building in which a beam on the floor is constituted by adjacently arranging building units made of a wooden member,
4. A unit building, wherein the damping material according to claim 1, 2 or 3 is sandwiched between beams on the floor of an adjacent building unit.