Transparent heat-shielding/heat-insulating member and production method thereof
A transparent heat-shielding/heat-insulating member includes a transparent substrate 11 and, from the transparent substrate side, an infrared reflective layer 12 and a protective layer 18 in this order. The protective layer 18 includes, from the infrared reflective layer side, a medium refractive index layer 13 , a high refractive index layer 14 and a low refractive index layer 15 in this order. The medium refractive index layer 13 has a light refractive index at a wavelength of 550 nm of 1.45 to 1.55 and a thickness of 80 to 200 nm. The high refractive index layer 14 has a light refractive index at a wavelength of 550 nm of 1.65 to 1.95 and a thickness of 100 to 350 nm. The low refractive index layer 15 has a light refractive index at a wavelength of 550 nm of 1.30 to 1.45 and a thickness of 70 to 150 nm.
1. A transparent heat-shielding/heat-insulating member comprising a transparent substrate and a functional layer formed on the transparent substrate,
wherein the functional layer includes, from the transparent substrate side, an infrared reflective layer and a protective layer in this order,
the protective layer includes, from the infrared reflective layer side, a medium refractive index layer, a high refractive index layer and a low refractive index layer in this order,
the infrared reflective layer includes a metal oxide layer and a metal layer,
the low refractive index layer is composed of a coating layer containing an ionizing radiation curable resin,
the medium refractive index layer has a light refractive index at a wavelength of 550 nm of 1.45 to 1.55 and a thickness of 80 to 200 nm,
the high refractive index layer has a light refractive index at a wavelength of 550 nm of 1.65 to 1.95 and a thickness of 100 to 350 nm,
the low refractive index layer has a light refractive index at a wavelength of 550 nm of 1.30 to 1.45 and a thickness of 70 to 150 nm, and
a normal emissivity based on JIS R3106 is 0.2 or less on the functional layer side.
2. The transparent heat-shielding/heat-insulating member according to claim 1 ,
wherein the medium refractive index layer is made of a modified polyolefin resin having an acidic group.
3. The transparent heat-shielding/heat-insulating member according to claim 1 ,
wherein the high refractive index layer is made of a resin and inorganic fine particles.
4. The transparent heat-shielding/heat-insulating member according to claim 1 ,
wherein the low refractive index layer further contains inorganic fine particles, and
the inorganic fine particles comprise hollow silica.
5. The transparent heat-shielding/heat-insulating member according to claim 1 ,
wherein the infrared reflective layer is made of a conductive stacked film including a metal oxide layer, a metal layer and a metal oxide layer in this order.
6. The transparent heat-shielding/heat-insulating member according to claim 1 ,
wherein after a 1000-hour weather resistance test according to JIS A5759, separation of the protective layer is not observed in a cross cut adhesion test according to JIS D0202-1998.
7. The transparent heat-shielding/heat-insulating member according to claim 1 ,
wherein a cholesteric liquid crystal polymer layer is further formed on a surface of the transparent substrate on which the infrared reflective layer is not formed.
8. The transparent heat-shielding/heat-insulating member according to claim 7 ,
wherein the cholesteric liquid crystal polymer layer is formed by photopolymerization of a material containing a liquid crystal compound having a polymerizable functional group, a chiral agent having a polymerizable functional group and a multifunctional acrylate compound.