JP-2026074624-A - High light-transmitting insect-repellent and heat-shielding sheet

Abstract

[Problem] To provide a highly transparent insect-repellent and heat-shielding sheet that is transparent, has heat-shielding properties, and insect-repellent properties, and provides stable and sustainable insect-repellent effects against flying insects such as moths, flies, and mosquitoes in extremely hot environments where heat shielding is required, for use in retractable sheet shutters, partitions, etc. [Solution] A laminated sheet comprising a grid-like substrate, which is a woven fabric or a net, with a heat-shielding layer provided on at least one surface, wherein the heat-shielding layer contains at least luminous mica particles and a pyrethroid compound/cellulose nanofiber composite, and the pyrethroid compound/cellulose nanofiber composite contains cellulose nanofibers that have adsorbed a portion of the pyrethroid compound. [Selection Diagram] None

Inventors

• 狩野 俊也

Assignees

• 平岡織染株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (6)

1. A laminated sheet comprising a grid-like substrate, such as a woven fabric or net, with a heat-shielding layer provided on at least one surface, wherein the heat-shielding layer contains at least luminous mica particles and a pyrethroid compound/cellulose nanofiber composite, and the pyrethroid compound/cellulose nanofiber composite contains cellulose nanofibers that have adsorbed a portion of the pyrethroid compound, characterized in that it is a highly light-transmitting, insect-repellent, heat-shielding sheet.
2. The highly translucent insect-repellent and heat-shielding sheet according to claim 1, wherein the luminous mica particles are composed of synthetic mica and a thin film coating layer, and the thin film coating layer is selected from one of the following: a single layer of titanium dioxide, two layers of titanium dioxide/silicon dioxide, and three layers of titanium dioxide/silicon dioxide/titanium dioxide.
3. The highly light-transmitting insect-repellent and heat-shielding sheet according to claim 1 or 2, wherein the pyrethroid compound is empenthrin, flamethrin, prallethrin, allethrin, imiprothrin, pyrethrin, phthalthrin, resmethrin, phenothrin, metofluthrin, synerin II, transfluthrin, jasmolin II, cyphenothrin, peratrin, etofenprox, monfluorothrin, permethrin, silafluofen, tefluthrin, bifenthrin, and cyfluthrin.
4. The highly light-transmitting insect-repellent and heat-shielding sheet according to any one of claims 1 to 3, wherein the heat-shielding layer contains an ultraviolet-excited keto/enol-type tautomer, and the ultraviolet-excited keto/enol-type tautomer is one or more selected from benzotriazole compounds, triazine compounds, and diphenyl ketone compounds.
5. The highly transparent insect-repellent heat-shielding sheet according to any one of claims 1 to 4 , wherein the heat-shielding layer comprises one or more near-infrared absorbing materials selected from tungsten oxide, indium oxide, tin-doped indium oxide (ITO), antimond-doped tin oxide (ATO), cesium-doped tungsten oxide (CWO), aluminum-doped zinc oxide (AZO), lanthanum hexaboride (LaB6), phthalocyanine compounds, naphtholquinone compounds, iminium compounds, anthraquinone compounds, aminium compounds, and nickel-thiol complex compounds, and the heat-shielding layer is colored.
6. A highly translucent insect-repellent and heat-shielding sheet according to any one of claims 1 to 4, wherein an antifouling layer is provided on the heat-reflective layer, and the antifouling layer contains one or more near-infrared absorbing materials selected from tungsten oxide, indium oxide, tin-doped indium oxide (ITO), antimond-doped tin oxide (ATO), cesium-doped tungsten oxide (CWO), aluminum-doped zinc oxide (AZO), and lanthanum hexaboride ( LaB6 ), and the antifouling layer possesses both antifouling and heat-shielding properties.

Description

This invention relates to a highly translucent partition sheet with heat-shielding and insect-repellent properties, used in applications such as retractable sheet shutters for factory and warehouse entrances, tent structures for outdoor amusement facilities (theme parks, sunshades in event and exhibition venues, etc.), open terrace awnings and parasols, sunshade enclosures for gardens and orchards, partitions within factories and research facilities, partitions within hospitals and medical facilities, partitioned stalls, and the like. As general-purpose flexible partition sheets, there are laminates with a thickness of 0.25 mm to 0.50 mm (film portion within the grid) that use a grid-like net or mesh-like fabric as the base material and heat-laminated both sides with a transparent, flexible polyvinyl chloride resin film, as well as curtain-type products with a thickness of 0.50 mm to 2.0 mm that do not include the base material. These flexible partition sheets are used in a wide variety of applications, including retractable sheet shutters at factory and warehouse entrances, tent structures for outdoor amusement facilities (theme parks, sunshades in event and exhibition venues, etc.), pool fences, open terrace awnings and parasols, sunshade enclosures for gardens and orchards, partitions within factories and research facilities, partitions within hospitals and medical facilities, and partitioned stalls. In particular, partition sheet materials such as automatic lifting sheet shutters and curtain-type screens installed at the entrances and exits of factories and factory warehouses are commonly colored yellow to orange to prevent phototactic insects such as moths, flies, midges, and stink bugs from entering the factory. Phototactic insects sense wavelengths of 250 to 650 nm and also sense ultraviolet light in the 250 to 380 nm range, which is invisible to humans, and are particularly attracted to ultraviolet light emitted from lighting lamps, causing problems with their entry. This insect-repellent coloring absorbs and cuts wavelengths of 400 to 480 nm, and by using ultraviolet absorbers in combination, it also absorbs and cuts wavelengths below 380 nm, thereby dulling the light-sensing ability of phototactic insects. Inventions of partition sheets such as those disclosed in Patent Documents 1 and 2 have been disclosed. However, with the global shift to LED lighting in the lighting market, ultraviolet and thermal radiation from lamps has been virtually eliminated, reducing the attraction of phototactic insects to light sources. However, for wavelengths between 400 and 650 nm, the effect relies on the blinding effect (decreased light perception) of yellow light. On the other hand, nocturnal moths, which exhibit negative phototaxis, are at high risk of being preyed upon by birds during the day. Therefore, they have a habit of becoming immobile at night, mistaking the light for daylight, to avoid predation. Yellow light around 570 nm, in particular, easily triggers a photoreaction (daylight illusion) in their compound eyes, and yellow light moth-repellent lamps are used in agricultural fields as a means of preventing the attraction of nocturnal moths. On the other hand, there are various problems caused by pests that are not related to phototaxis, such as cockroaches and flies that are attracted to odorous substances emitted from fresh food, fermented products, and food waste for the purpose of feeding and laying eggs, as well as blood-sucking insects such as mosquitoes and gnats that are attracted to odorous substances contained in the breath and sweat of humans and animals. Yellow to orange colored sheet shutters and curtain-style curtains were not particularly effective in preventing the entry of these pests. Meanwhile, for household use, products using evaporative pyrethroid insecticides with insecticidal and paralyzing (knockdown) effects (such as insect-repellent sheets for wardrobes and insecticidal aerosols) are commercially available as insect repellent (repellent) methods, mainly targeting flies, mosquitoes, cockroaches, and mites. This pyrethroid-based insecticide has been applied to partition materials, as described in Patent Documents 1 and 2, resulting in the invention of partition sheets (Patent Document 3), which makes it possible to obtain insecticidal effects against both pests related to phototaxis and those unrelated to phototaxis. However, with sheet shutters and curtains colored yellow to orange, sunlight entering the factory or facility causes the entrance area to be illuminated with a yellow to orange translucent color, creating an unusual indoor environment. Furthermore, the yellow to orange translucent light leaking from indoors at night is conspicuous, leading to a recent decline in new demand for such products. On the other hand, in summer when extremely hot days become commonplace, heat-shielding properties are required for partition sheet materials such as sheet shutters and curtain