Composition for sound insulating sheet member, sound insulating sheet member, and sound insulating structure body
A structural body including a plurality of convex-shaped rubber-elastic resonant portions, and a sheet-like support that supports the resonant portions. A specific gravity of the resonant portions is 1.0 g/cm 3 or more and 3.0 g/cm 3 or less, a height of the resonant portions is from 50 μm to 100 mm, and an areal density of the support is 1.0 kg/m 2 or less.
1. A structural body, comprising:
a plurality of convex-shaped rubber-elastic resonant portions; and
a sheet-like support that supports the resonant portions,
wherein a specific gravity of the resonant portions is in a range of from 1.0 to 3.0 g/cm 3 ,
wherein a height of the resonant portions is in a range of from 50 μm to 100 mm, and
wherein an areal density of the support is 1.0 kg/m 2 or less.
2. The structural body of claim 1 , comprising a sheet member comprising the resonant portions and a rubber-elastic sheet portion on which the resonant portions are provided,
wherein the sheet member is layered on the support.
3. The structural body of claim 2 , wherein the sheet member is integrally molded.
4. The structural body of claim 1 , wherein the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 1 MPa or more at 25° C. and 10 KHz.
5. The structural body of claim 1 , wherein the resonant portions have a peak temperature of tan δ obtained by dynamic viscoelasticity measurement according to ISO 6721-4 of 20° C. or less at 1 Hz.
6. The structural body of claim 1 , wherein the resonant portions have a tensile elongation at break at a tensile speed of 5 mm/min of 30% or more in accordance with ISO 527.
7. The structural body of claim 1 , wherein the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 80 MPa or less at 25° C. and 5 kHz.
8. The structural body of claim 1 , wherein the resonant portions comprise a photo-curable resin.
9. The structural body of claim 1 , wherein the specific gravity of the resonant portions is uniform.
10. The structural body of claim 2 , wherein a height of the sheet member is in a range of from 50 μm to 10 mm.
11. The structural body of claim 1 , wherein the resonant portions have a configuration of a single structure body.
12. The structural body of claim 1 , wherein the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of less than 4500 MPa at 25° C. and 10 KHz.
13. The structural body of claim 1 , wherein the height of the resonant portions is in a range of from 100 μm to 50 mm.
14. The structural body of claim 1 , wherein the height of the resonant portions is in a range of from 1 to 30 mm.
15. The structural body of claim 1 , wherein the specific gravity of the resonant portions is in a range of from 1.01 to 2.5 g/cm 3 .
16. The structural body of claim 1 , wherein the areal density of the support is in a range of from 0.01 to 0.9 kg/m 2 .
17. The structural body of claim 1 , wherein the areal density of the support is in a range of from 0.05 to 0.7 kg/m 2 .
18. The structural body of claim 1 , wherein the sheet-like support comprises a thermosetting resin.
19. The structural body of claim 1 , wherein the sheet-like support comprises a saturated polyester resin, a polycarbonate resin, a polyamide resin, a polyolefin resin, a polyarylate resin, a polysulfone resin, and/or a polyphenylene ether resin.
20. The structural body of claim 1 , wherein a difference between maximum and minimum specific gravities of the plurality of the resonant portions is within 0.5 g/cm 3 .