Composition for sound insulating sheet member, sound insulating sheet member, and sound insulating structure body
Provided is a composition for a sound insulating sheet member, a sound insulating sheet member, and a sound insulating structure body with excellent sound insulating performance. A sound insulating structure body including: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein the resonant portions have a storage modulus G′ obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25° C. and 10 kHz, and the areal density of the support is 1.0 kg/m 2 or less.
1. A sound insulating structure body comprising: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein
the resonant portions have a storage modulus G obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25° C. and 10 kHz, and
the areal density of the support is 1.0 kg/m 2 or less.
2. The sound insulating structure body according to claim 1 , comprising a sound insulating sheet member including the resonant portions and a rubber-elastic sheet portion on which the resonant portions are provided, wherein
the sound insulating sheet member is layered on the support.
3. The sound insulating structure body according to claim 2 , wherein the sound insulating sheet member is integrally molded.
4. The sound insulating structure body according to 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 sound insulating structure body according to claim 1 , wherein the resonant portions have a peak temperature of tan 6 obtained by dynamic viscoelasticity measurement according to ISO 6721-4 of 20° C. or less at 1 Hz.
6. The sound insulating structure body according to 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 sound insulating structure body according to 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 sound insulating structure body according to claim 1 , wherein the resonant portions include a photo-curable resin.
9. The sound insulating structure body according to claim 1 , wherein the specific gravity of the plurality of resonant portions is uniform.
10. The sound insulating structure body according to claim 1 , wherein the height of the sound insulating sheet member is from 50 μm to 10 mm.
11. The sound insulating structure body according to claim 1 , wherein the resonant portions have a configuration of a single structure body.