Search

US-12617192-B2 - Light- and heat-shielding composite sheet and fiber product

US12617192B2US 12617192 B2US12617192 B2US 12617192B2US-12617192-B2

Abstract

A light- and heat-shielding composite sheet includes: a fiber cloth; at least one layer of a synthetic resin film containing carbon black at a rate of 4% to 40% by mass both inclusive; and a synthetic resin adhesive containing titanium dioxide at a rate of 30% to 60% by mass both inclusive and bonding the fiber cloth with the synthetic resin film.

Inventors

  • Yohei NAKAYA
  • Tatsuo Hasegawa
  • Masakatsu NISHIHARA
  • Koji Sawada

Assignees

  • TORAY INDUSTRIES, INC.
  • KOMATSU MATERE CO., LTD.

Dates

Publication Date
20260505
Application Date
20201001
Priority Date
20191001

Claims (7)

  1. 1 . A light- and heat-shielding composite sheet, consisting of: a fiber cloth; one layer of a synthetic resin film containing carbon black at a rate of 4% to 40% by mass both inclusive; and a synthetic resin adhesive layer containing titanium dioxide at a rate of 30% to 60% by mass both inclusive, wherein the synthetic resin adhesive layer is the only adhesive layer present, and contacts and bonds together the fiber cloth with the synthetic resin film.
  2. 2 . The light- and heat-shielding composite sheet according to claim 1 , wherein a brightness (L-value) of a surface of the fiber cloth is 95% or more of a brightness (L-value) of the fiber cloth alone without being bonded with the synthetic resin film.
  3. 3 . The light- and heat-shielding composite sheet according to claim 1 , wherein the synthetic resin film includes a polyurethane resin and has a thickness of 10 μm to 30 μm both inclusive.
  4. 4 . The light- and heat-shielding composite sheet according to claim 1 , wherein a dry application amount of the synthetic resin adhesive is 30 g/m 2 to 60 g/m 2 both inclusive.
  5. 5 . The light- and heat-shielding composite sheet according to claim 1 , wherein a light-shielding property according to JIS L1055 A method is 99.9% or more.
  6. 6 . The light- and heat-shielding composite sheet according to claim 1 , wherein the light- and heat-shielding composite sheet has a 7.7.7 heat-shielding index according to a JUPA standard of 40 or more.
  7. 7 . A fiber product that incorporates the light- and heat-shielding composite sheet according to claim 1 .

Description

FIELD The present invention relates to a light- and heat-shielding composite sheet and a fiber product. BACKGROUND In recent years, due to global warming and ozone layer depletion, there have been the increases in the number of heat stroke due to extreme heat in the summer, the effect of a harmful ultraviolet ray (UV-B) contained in sunlight on the ecosystem, and the effect on the human body such as a skin cancer and a lowered immune function. In order to solve these problems, there is a growing demand for sunshade materials such as a parasol and a tent having improved light- and heat-shielding properties. Conventionally, a high-density woven fiber cloth dyed in black has been used as the fiber product for sunshade such as a parasol, but there has been a problem in that this cannot sufficiently shield an ultraviolet ray, a visible ray, and an infrared ray contained in the sunlight. For this reason, materials coated with a resin containing a functional agent such as titanium dioxide and black pigment, which have UV- and heat-shielding functions, are increasingly used on the surface of an umbrella cloth (see Patent Literature 1 and Patent Literature 2). A material has also been proposed in which the surface side thereof is formed of a light-colored resin sheet that is laminated with a dark-colored resin sheet so that the sunlight passing through from the surface side may be reflected at the ground surface and the incident light is absorbed on the back of the umbrella cloth (see Patent Literature 3). Furthermore, a multilayer sheet for sunshade has been proposed in which a synthetic resin film containing a predetermined percentage of titanium dioxide and a synthetic resin film containing a predetermined percentage of carbon black are laminated to a fiber cloth by an adhesive (see Patent Literature 4). CITATION LIST Patent Literature Patent Literature 1: Japanese Patent Application Laid-open No. 2007-325757Patent Literature 2: Japanese Patent Application Laid-open No. 2008-115488Patent Literature 3: Japanese Patent Application Laid-open No. 2011-56072Patent Literature 4: International Publication No. 2014/185440 SUMMARY Technical Problem However, it is difficult to completely shield the ultraviolet and infrared rays with the coating materials of Patent Literatures 1 and 2 because not only the amount of the additive needs to be controlled in a level that does not impair the coating properties of the resin, but also the film thickness cannot be made thick; thus, sufficient light- and heat-shielding properties cannot be obtained. In addition, simply making the back side darker, as in Patent Literature 3, does not provide a sufficient cooling effect because it does not completely cut off the ultraviolet and infrared rays. On the other hand, the multilayered sheets for sunshade in Patent Literature 4 have excellent light-shielding and cooling effects. However, in recent years, a light-shielding material such as a parasol has been required to have not only functionalities such as light-shielding and cooling effects, but also color and design features; but Patent Literatures 1 to 4 do not pay attention at all to the color of the fiber cloth to be used. The present invention was made in light of the above; thus, an object thereof is to provide a light- and heat-shielding composite sheet and a fiber product that have not only excellent light- and heat-shielding properties, but also excellent coloration. Solution to Problem To solve the problem described above and to achieve the object, a light- and heat-shielding composite sheet according to the present invention includes: a fiber cloth; at least one layer of a synthetic resin film containing carbon black at a rate of 4% to 40% by mass both inclusive; and a synthetic resin adhesive containing titanium dioxide at a rate of 30, to 60% by mass both inclusive and bonding the fiber cloth with the synthetic resin film. In the light- and heat-shielding composite sheet according to the present invention, a brightness (L-value) of a surface of the fiber cloth is 95% or more of a brightness (L-value) of the fiber cloth alone without being bonded with the synthetic resin film. In the light- and heat-shielding composite sheet according to the present invention, the synthetic resin film includes a polyurethane resin and has a thickness of 10 μm to 30 μm both inclusive. In the light- and heat-shielding composite sheet according to the present invention, a dry application amount of the synthetic resin adhesive is 30 g/m2 to 60 g/m2 both inclusive. In the light- and heat-shielding composite sheet according to the present invention, a light-shielding property according to JIS L1055 A method is 99.9% or more. In the light- and heat-shielding composite sheet according to the present invention, wherein 7.7.7 heat-shielding index of JUPA standard is 40 or more. A fiber product according to the present invention uses any one of the above-mentioned light- and heat-shielding composite sheets.