Multilayer structure
Provided is a multilayer structure including a radiator, a base material layer that includes a region forming an interface in an internal structure, and a first air layer that is provided between the radiator and the base material layer, in which a far-infrared transmittance B of the base material layer and a solar light reflectance A of the multilayer structure satisfy B/(100−A)>7, and a solar light reflectance C of the base material layer is 30% or more.
1. A multilayer structure comprising:
a radiator;
a base material layer that includes a region forming an interface in an internal structure; and
a first air layer that is provided between the radiator and the base material layer,
wherein a far-infrared transmittance B of the base material layer and a solar light reflectance A of the multilayer structure satisfy B/(100−A) >7,
a solar light reflectance C of the base material layer is 30% or more,
the base material layer is a non-woven fabric or a resin film containing particles,
in a case in which the base material layer is the non-woven fabric, the region forming the interface in the internal structure comprises voids forming a solid-gas interface with fibers of the non-woven fabric, and
in a case in which the base material layer is the resin film containing the particles, the region forming the interface in the internal structure comprises the particles forming a solid-solid interface with the resin.
2. The multilayer structure according to claim 1 ,
wherein the far-infrared transmittance B of the base material layer and the solar light reflectance C of the base material layer satisfy B/(100−C)>7.
3. The multilayer structure according to claim 1 ,
wherein the number of the base material layers is two or more.
4. The multilayer structure according to claim 3 , further comprising:
a second air layer that is provided between the base material layers.
5. The multilayer structure according to claim 4 ,
wherein a thickness of the second air layer is 5 cm or less.
6. The multilayer structure according to claim 1 ,
wherein the far-infrared transmittance B of the base material layer and the solar light reflectance A of the multilayer structure satisfy B/(100−A)>20.
7. The multilayer structure according to claim 1 ,
wherein the solar light reflectance C of the base material layer is 80% or more.
8. The multilayer structure according to claim 1 ,
wherein an average diameter of the region forming the interface in the internal structure is 5000 nm or less.
9. The multilayer structure according to claim 1 ,
wherein the region forming the interface in the internal structure is at least one selected from a void or a particle.
10. The multilayer structure according to claim 1 ,
wherein the base material layer is a porous base material layer.
11. The multilayer structure according to claim 1 ,
wherein a void volume of the base material layer is 40% or more.
12. The multilayer structure according to claim 1 ,
wherein the base material layer contains polyolefin.
13. The multilayer structure according to claim 1 ,
wherein the multilayer structure is a radiative cooling structure.