JP2001148951A - Near infrared radiation screening and coating material having improved plant growth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new coating material for improving a growth control under low light conditions occurring in the winter in the case of growing a plant by using the coating material for selectively screening a near infrared radiation. SOLUTION: This near infrared radiation screening and coating material is characterized in that the coating material has 50-90% photosynthesis effective radiation transmittance of 0.4-0.7 μm, 40-80% solar radiation transmittance and the ratio (R/RF) of average transmittance at 0.6-0.7 μm wavelength to average transmittance at 0.7-0.8 μm wavelength of 0.90-1.02.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural covering, and more particularly to a near-infrared radiation shielding covering which has improved crop growth under low light.

[0002]

2. Description of the Related Art When cultivating crops using a house, the temperature inside the house becomes high due to the strong solar radiation in the summer, which causes a growth disorder (hereinafter also referred to as a high temperature disorder). Various coating materials have been provided for the purpose of solving the problem. As a typical example, a material having no wavelength selectivity with respect to a wavelength included in solar radiation, such as a cold gauze or a metal-deposited film, is often used. With such a coating material, the wavelength range of 0.4 to 0.7 μm, which is a photosynthetically effective radiation wavelength range during sunlight, and the wavelength range of 0.8 to 1.8 μm, which is a near-infrared radiation wavelength, are blocked only at the same ratio. Can not do. For this reason, it has been pointed out that when the light-shielding rate of the covering material is increased in order to suppress the temperature rise in the greenhouse under direct sunlight, the photosynthetic effective radiation transmittance also decreases, and the growth of plants is greatly impaired.

[0003] In recent years, in place of a coating material having no wavelength selectivity having the above-mentioned problems, a light beam of photosynthetically effective radiation during sunlight is transmitted, and near-infrared radiation which does not contribute to photosynthesis is selectively blocked. A coating material having a near-infrared radiation blocking function has been studied. With respect to these new coating materials, only optical and physical studies such as wavelength selectivity and near-infrared radiation blocking property have been preceded, and their effects on plant growth have not been studied in detail.

[0004]

SUMMARY OF THE INVENTION The present inventor has conducted a plant growth test using a covering material having a property of transmitting photosynthetically active radiation well and selectively blocking near-infrared radiation. Under the covering material that selectively blocks external radiation, the present inventors discovered that plant growth was suppressed under low light conditions during winter when solar radiation was weak, and in examining the solution of this problem, the present invention It was reached. That is, the present invention provides a novel coating for improving the growth suppression under low light conditions that occurs in winter when plants are grown using a coating that selectively blocks near-infrared radiation. The purpose is to provide. According to the present invention, the growth suppression under low light conditions in winter is eliminated, so that a covering material having a near-infrared radiation blocking function can be used for the year.

[0005]

That is, according to the present invention, there is provided a liquid crystal display device comprising:
The photosynthetic effective radiation transmittance of 0.7 μm is in the range of 50 to 90%, the solar radiation transmittance is in the range of 40 to 80%, and the average transmittance of the wavelength of 0.6 to 0.7 μm is 0.7 to 0. .8
The average transmittance ratio (R / FR) in μm is 0.90-1.
02, which relates to a near-infrared radiation shielding coating material.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The coating material of the present invention needs to have a sufficiently large photosynthetic effective radiation transmittance, which is a transmittance at a wavelength of 0.4 to 0.7 μm that can be used by plants for photosynthesis. In addition, it is necessary to block near-infrared radiation having a wavelength of 0.8 to 1.8 [mu] m, which does not contribute to photosynthesis, for the purpose of preventing high-temperature damage in summer. Furthermore, in order to improve the growth of plants, the average transmittance at a wavelength of 0.6 to 0.7 μm and 0.7
It is necessary to correct the average transmittance ratio (R / FR) of ０．８0.8 μm to a specific range.

The inventors of the present invention have investigated the growth of tomato using a covering material that blocks near-infrared radiation in a low light environment in winter,
It was found that when the R / FR ratio was 1.03, the growth of tomato was suppressed as compared to the control. Furthermore, the present inventors have studied the improvement of tomato growth using a covering material that blocks near-infrared radiation in a low light environment in winter, and as a result, the R / FR ratio was 1.03.
The goal was achieved by setting the value to a specific range that was lower than.

The coating material of the present invention has a photosynthetically effective radiation transmittance of 0.4 to 0.7 μm of 50 to 90%, preferably 6 to 90%.
It is in the range of 0 to 85%, more preferably 65 to 80%. If the effective radiation transmittance of photosynthesis is less than 50%, the amount of light that can be used for photosynthesis by the plant cannot be ensured, so that it tends to grow into a so-called weak plant that has hindered the growth, which is not preferable. Here, the photosynthetic effective radiation transmittance is
Using CIE standard illuminant _{D 65,} it is calculated by the following equation number 1.

(Equation 1) (Here, d [lambda] is the spectral distribution of standard light _{D 65,} Vlambda is C
IE light adaptation standard relative luminosity, τ (λ) is the spectral transmittance of the coating material, and the calculation of Σ is performed in the range of λ = 0.4 to λ = 0.7. )

Next, in order to prevent high temperature damage in summer in a covered environment such as a greenhouse or a house or a tunnel,
In the present invention, it is necessary to selectively reflect and absorb near-infrared rays in sunlight to attenuate the transmittance of sunlight passing through the coating material and entering the coating environment, that is, the sunlight transmittance. Here, the solar radiation transmittance is JISR
3106 refers to a value measured using the method described in 3106. From the viewpoint of preventing high temperature damage, the solar radiation transmittance should be 4
It must be in the range of 0-80%, preferably 45-75%, more preferably 50-70%. If the solar transmittance exceeds 80%,
The ambient temperature in the house, the soil temperature or the leaf temperature of the crop may rise excessively, causing a high temperature damage to the plants. On the other hand, when the solar radiation transmittance is lower than 40%, the temperature rise in the house is suppressed, but the photosynthetically effective radiation transmittance in the sunlight is significantly reduced, which is not preferable for growing the crop.

In the case of a coating material for selectively blocking near-infrared radiation, although it depends on the type of near-infrared radiation blocking material to be used, the photosynthetic effective radiation transmittance and 0.7 to 0.7 are preferred.
It is difficult to selectively block only near-infrared radiation without any reduction in the transmittance at a wavelength of 0.8 μm. In general, the R / FR ratio takes a value larger than 1 in order to increase the photosynthetic effective radiation transmittance and decrease the near-infrared radiation transmittance. The inventors have found that the R / FR ratio region, which was conventionally thought to have no effect on growth,
It has been found that even a near-infrared radiation-blocking coating material having an R / FR ratio of 1.03 suppresses growth under low light conditions in winter. On the other hand, the near-infrared radiation-blocking coating material is required to be stretched throughout the year, and as a result of studying to improve the growth during the winter season, the present invention has been achieved.

That is, the near-infrared radiation shielding coating material according to the present invention has an average transmittance of 0.6 to 0.7 μm and a transmittance of 0.7 to 0.8 μm.
μm average transmittance ratio (R / FR ratio) of 0.90
1.02, preferably 0.93 to 1.01, more preferably 0.95 to 1.01. When the R / FR ratio is less than 0.90, the photosynthetically effective radiation transmittance is greatly reduced, and as a result, the growth rate of the crop is deteriorated, which is not preferable. On the other hand, R / FR
When the ratio is more than 1.03, the growth rate of the plant deteriorates under low light conditions, which is not preferable.

The near-infrared radiation blocking function may be possessed by the substrate constituting the coating material of the present invention. Alternatively, it may be formed on at least one surface of the substrate constituting the coating material of the present invention.

[0013] The coating material of the present invention is composed of a substrate alone or a substrate and a plurality of layers formed on the surface of the substrate. And a part having a function of correcting the ratio (R / FR ratio) between the average transmittance of 0.6 to 0.7 μm and the average transmittance of 0.7 to 0.8 μm constitutes the covering material. The same site may be used, or a site having near-infrared radiation blocking properties, an average transmittance of 0.6 to 0.7 μm, and 0.7 to 0.7 μm.
The portion for correcting the average transmittance ratio (R / FR ratio) of 0.8 μm may be separated and assigned to a plurality of separate portions.

Examples of materials having a near-infrared blocking function that constitute a layer having a near-infrared radiation blocking function (near-infrared radiation blocking layer) include various materials such as indium oxide, tin oxide, zinc oxide, and zinc antimonate. Metal oxides. Metal oxides are preferably used because they have excellent weather resistance and do not deteriorate during long-term exhibition. In order to impart the metal oxide with the property of selectively blocking near infrared rays, it is necessary to impart electron conductivity. For this purpose, indium oxide is doped with tin, tin oxide with antimony, and zinc oxide with aluminum of about several mass%. For the near-infrared radiation blocking layer, the above-described indium oxide, tin oxide, zinc oxide, and zinc antimonate may be used alone, or may be used by mixing at an appropriate ratio.

As one method of forming the near-infrared radiation blocking layer, there is a method in which the above-mentioned conductive metal oxide is made into fine particles, dispersed in an appropriate binder resin, and applied to the surface of a substrate. Alternatively, it is also possible to disperse a conductive metal oxide fine powder in the base material itself. The composition ratio of the metal oxide and the binder depends on the thickness of the metal oxide-containing layer described later, but is 1 to 99 mass if the ratio of the metal oxide to the total amount of the metal oxide and the binder resin is shown. %, Preferably 5 to 80% by mass, and more preferably 10 to 60% by mass. If the amount of the metal oxide is less than 1% by mass, the near-infrared cut property decreases, which is not preferable. If the amount of the metal oxide exceeds 99% by mass, the dispersibility of the metal oxide becomes extremely poor, and the workability is also poor, which is not preferable. As the binder resin, a resin having a large transmittance of visible light, for example, a vinyl compound polymer such as polyethylene, polyacrylic acid, polyacrylate, polyvinyl acetate, polyacrylonitrile, polyvinyl chloride, polyvinyl fluoride, or the like, or , Copolymers, addition polymers,
Vinyl compounds such as polymethacrylic acid, polymethacrylic acid ester, polyvinylidene fluoride, polyvinylidene chloride, vinylidene fluoride / tetrafluoroethylene copolymer, tetrafluoroethylene / ethylene copolymer, vinyl acetate / ethylene copolymer, Or a fluorine-based material such as a copolymer of a fluorine-based compound, polytetrafluoroethylene, polyhexafluoropropylene, a tetrafluoroethylene / hexafluoropropylene copolymer, a polyamide such as nylon 6, nylon 66, a polyimide, a polyurethane, Polyethers such as polyester resins such as polyethylene terephthalate, polycarbonate, epoxy resin, polyoxymethylene, polyethylene oxide, polypropylene oxide, etc., polyvinyl alcohol, polyvinyl butyral Melamine resins, silicone resins, thermoplastic resins such as cellulose resins, or a heat or photocurable resin may be mentioned as a binder. Among them, preferred substrates are polyethylene, polyvinyl acetate, vinyl acetate / ethylene copolymer, vinyl chloride,
Examples include polymethyl methacrylate, polycarbonate, polyethylene terephthalate, and the like. Mixing of these resins and metal oxide powder, especially in the case of thermoplastic resin,
A method in which the metal oxide powder is dispersed in a state where the resin is heated and melted can be used. Although it depends on the type of the resin, a method in which a metal oxide is dispersed in an appropriate plasticizer and added to and mixed with the resin together with the plasticizer can also be used. Examples of the processing method using a thermoplastic resin include hot roll kneading, calender molding, and kneading using an extruder, which are generally used. It becomes possible to obtain a plate-like or film-like molded body containing the metal oxide fine powder by such a method, and the obtained molded body can be used as a base material, or can be composited or pasted with another base material. It can be used together.

As another method of obtaining a metal oxide uniformly mixed and dispersed in a binder resin, an organic solvent can be used in combination as a dispersant. As such an organic solvent, any solvent can be used as long as it dissolves the resin, and examples thereof include alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, butyl alcohol, and hexyl alcohol, acetone, and methyl ethyl ketone. , Ketones such as cyclohexanone, esters such as ethyl acetate, butyl acetate, and cellosolve acetate; cyclic ethers such as dioxane and tetrahydrofuran; halogenated hydrocarbons such as methylene chloride and chloroform; benzene, xylene, and toluene. Compounds such as aromatic hydrocarbons, cyclohexane, dimethylformamide, dimethylacetamide, and acetonitrile, and mixtures of these compounds are used. The content of the solid components such as the resin component and the metal oxide in the mixture of the organic solvent, the resin and the metal oxide is 10 to 70% by mass, preferably 20 to 60% by mass. The desired coating material is obtained by coating the mixture obtained by the above method on a transparent film, glass, or the like using a bar coater, a doctor blade, a spin coater, a die coater, a reverse coater, a spray, or the like. Can be obtained. When the binder resin is a (meth) acrylic resin, one of the methods for obtaining a resin composition in which a metal oxide is uniformly mixed and dispersed is to use a metal oxide fine particle in a (meth) acrylic monomer. The desired coating material can be obtained by dispersing and mixing the powder, coating it by the above-described method, and polymerizing and solidifying the (meth) acrylic monomer using heat or light. Examples of (meth) acrylic monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, isobutyl (meth) acrylate, and 2-ethylhexyl. (Meth) acrylate, isodecyl (meth) acrylate, n-lauryl (meth) acrylate, tridecyl (meth) acrylate, n-stearyl (meth) acrylate, isobornyl (meth)
Acrylate, methoxyethyl (meth) acrylate,
Ethoxyethyl (meth) acrylate, phenoxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, glycidyl (meth) acrylate,
It is a monofunctional (meth) acrylate such as 2-hydroxy-3-phenoxypropyl (meth) acrylate. In addition to the above monomers, ethylene glycol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, 1,3 -Butylene di (meth) acrylate,
1,4-butanediol di (meth) acrylate, 1,
6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 2-hydroxy-1,3-di (meth) acryloxypropane, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) ) Multifunctional (meth) such as acrylate, pentaerythrit tetra (meth) acrylate
Carboxylic acids such as acrylate, acrylic acid, methacrylic acid, 2-methacryloyloxyethyl succinic acid, 2-methacryloyloxyethyl phthalic acid, styrene, α-methylstyrene, chlorostyrene, dibromostyrene, methoxystyrene, divinylbenzene, and vinyl benzoate acid,
Examples thereof include aromatic vinyl compound monomers such as hydroxymethylstyrene and trivinylbenzene, and vinyl compounds such as vinylpyrrolidone. The monomers listed above can be used alone or in combination of two or more as needed. When the above-mentioned organic solvent or polymerizable monomer is used as a dispersant, various dispersants may be added to facilitate dispersion of the metal oxide fine powder. The amount of the dispersant added is such that photopolymerization is more preferably used than thermal polymerization during coating processing. The application of photopolymerization can be easily realized by adding a photopolymerization initiator together with a monomer.

The primary particle size of the metal oxide fine powder is 0.1
-100 nm, preferably 1-50 nm, more preferably 5-30 nm. Primary particle size of metal oxide is 10
When it exceeds 0 nm, light is scattered and the effective radiation transmittance of photosynthesis decreases, which is not preferable. When the primary particle diameter is less than 0.1 nm, the near-infrared radiation blocking property is deteriorated, which is not preferable.

The thickness of the near-infrared radiation shielding layer containing the metal oxide fine powder is required to ensure mechanical strength when the substrate itself is used as the near-infrared radiation shielding layer. Relatively thick, 0.02-5 mm, preferably 0.05
4 mm, more preferably 0.07 to 3 mm. If the thickness is less than 0.02 mm, the strength of the base material is undesirably reduced. On the other hand, if the thickness exceeds 5 mm, the scattering of light increases, and the effective radiation transmittance of photosynthesis decreases, which is not preferable.

When the near-infrared radiation blocking layer is formed on the surface of the base material, the thickness of the near-infrared radiation blocking layer is 0.1 mm.
001 to 0.1 mm, preferably 0.002 to 0.07
mm, more preferably 0.005 to 0.05 mm. If the thickness of the near-infrared radiation blocking layer is less than 0.001 mm, the near-infrared radiation blocking performance is undesirably reduced. On the other hand, if it exceeds 0.1 mm, the adhesion to the substrate is undesirably reduced.

When the near-infrared radiation blocking layer is a metal oxide thin film, the degree of conductivity is such that the surface resistance is 1000 ohm or less, preferably 100 ohm or less, more preferably 1 ohm or less.
Ohm or less. The surface resistance of the metal oxide thin film is 100
When it exceeds 0 ohm, the near-infrared radiation blocking property becomes insufficient, which is not preferable. The film thickness is 0.1 to 5 μm, preferably 0.3 to 3 μm, and more preferably 0.5 to 2 μm.
m. When the film thickness is less than 0.1 μm, sufficient near-infrared radiation blocking property cannot be obtained, which is not preferable. The film thickness is 5μ
If it exceeds m, the stress between the metal oxide film and the base material as the base increases, and the metal oxide film is liable to cracks and peeling, which is not preferable because of poor durability.

As a means for obtaining a metal oxide thin film, a thin film forming means such as vacuum deposition, sputtering, and CVD can be used.

In the near-infrared radiation shielding coating material of the present invention, F /
As means for correcting the FR ratio, the maximum absorption wavelength is 0.5 to
It is characterized by using a dye having a size of 0.7 μm, preferably 0.55 to 0.7 μm. Types of dyes that can be used can be used as long as the absorption wavelength is in the range of 0.5 to 0.7 μm, but if specific examples are given,
Organic dyes such as phthalocyanine, naphthalocyanine and naphthoquinone are preferably used.

The site containing the dye for correcting the F / FR ratio may be the substrate constituting the coating material as described above. Alternatively, it may be formed on at least one surface of the substrate constituting the coating material of the present invention. The configuration of the coating material of the present invention is composed of a substrate alone or a substrate and a plurality of layers formed on the surface of the substrate. The ratio of the average transmittance of 0.7 μm to the average transmittance of 0.7 to 0.8 μm (R / FR
The portion having the function of correcting (ratio) may be the same portion constituting the coating material, or a portion having a near-infrared radiation blocking property, and an average transmittance of 0.6 to 0.7 μm. The part for correcting the ratio of the average transmittance (R / FR ratio) of 0.7 to 0.8 μm may be separated and assigned to a plurality of separate parts.

The amount of the dye added is 0.0001 to 5% by mass, preferably 0.001 to 1% by mass, and more preferably 0.01 to 0.1% by mass when the correction layer is a substrate. If the amount of pigment is 0.0
When the amount is less than 001% by mass, correction is not sufficiently performed, which is not preferable. When the amount of the dye exceeds 5% by mass,
It is not preferable because absorption of photosynthetically effective radiation increases. When the correction layer is formed on at least one surface of the substrate, 0.0001 to 10% by mass, preferably 0.001 to 5% by mass,
More preferably, the content is 0.01 to 1% by mass. If the amount of pigment is 0.0
When the amount is less than 001% by mass, correction is not sufficiently performed, which is not preferable. If the amount of the dye exceeds 10% by mass,
The absorption of photosynthetically effective radiation is undesirably increased.

When the correction layer is formed on at least one surface of the substrate, its thickness is 0.001 to 0.1 m
m, preferably 0.002 to 0.07 mm, more preferably 0.005 to 0.05 mm. When the thickness of the correction layer is less than 0.001 mm, it is difficult to form a uniform film, and as a result, the correction layer may not be partially formed on the coating material, which is not preferable. on the other hand,
If it exceeds 0.1 mm, the adhesion to the substrate is undesirably reduced.

As one method of forming the correction layer, there is a method of dispersing an organic color such as phthalocyanine, naphthalocyanine or naphthoquinone in an appropriate binder resin and applying the organic color to the surface of a substrate. Or, on the substrate itself,
It is also possible to disperse and form an organic dye such as phthalocyanine, naphthalocyanine or naphthoquinone. As a binder resin or a substrate, a resin having a large visible light transmittance, for example, a vinyl compound such as polyethylene, polyacrylic acid, polyacrylate, polyvinyl acetate, polyacrylonitrile, polyvinyl chloride, polyvinyl fluoride, etc. Coupling or copolymer, addition polymer, polymethacrylic acid, polymethacrylic acid ester, polyvinylidene fluoride, polyvinylidene chloride, vinylidene fluoride / tetrafluoroethylene copolymer, tetrafluoroethylene / ethylene copolymer, acetic acid Vinyl compounds such as vinyl / ethylene copolymers, or fluorine-based materials such as copolymers of fluorine-based compounds, polytetrafluoroethylene, polyhexafluoropropylene, tetrafluoroethylene / hexafluoropropylene copolymers, nylon 6, nylon 6 Polyester resin such as polyamide, polyimide, polyurethane, polyethylene terephthalate, etc., polycarbonate, epoxy resin, polyoxymethylene, polyethylene oxide, polypropylene oxide, etc., polyether, polyvinyl alcohol, polyvinyl butyral, melamine resin, silicone resin, cellulose resin And the like, or a thermosetting or photocurable resin as the binder. Among them, preferred substrates include polyethylene, polyvinyl acetate, vinyl acetate / ethylene copolymer, vinyl chloride, polymethyl methacrylate, polycarbonate, polyethylene terephthalate and the like. Mixing of these resins with organic dyes such as phthalocyanine, naphthalocyanine, and naphthoquinone can be performed by using a method of dispersing a thermoplastic resin in a state where the resin is heated and melted. Further, although depending on the type of the resin, a method of dispersing a metal oxide in an appropriate plasticizer and adding it to the resin together with the plasticizer can be used. Examples of the processing method using a thermoplastic resin include hot roll kneading, calender molding, and kneading using an extruder, which are generally used. By such a method, a plate-shaped or film-shaped molded body can be obtained.

As another method for obtaining a binder resin in which organic dyes such as phthalocyanine, naphthalocyanine and naphthoquinone are uniformly mixed and dispersed, an organic solvent can be used in combination as a dispersant. As such an organic solvent, any solvent that can dissolve the resin can be used. For example, methyl alcohol,
Ethyl alcohol, isopropyl alcohol, butyl alcohol, hexyl alcohol, and other alcohols, acetone, methyl ethyl ketone, ketones such as cyclohexanone, ethyl acetate, butyl acetate, esters such as cellosolve acetate, dioxane, cyclic ethers such as tetrahydrofuran, Halogenated hydrocarbons such as methylene chloride and chloroform, aromatic hydrocarbons such as benzene, xylene, and toluene, compounds such as cyclohexane, dimethylformamide, dimethylacetamide, and acetonitrile, and mixtures of these compounds are used. The content of the solid components such as the resin component and the dye in the mixture of the organic solvent and the resin and the dye is 10 to 70% by mass, and preferably 20 to 60% by mass. The desired coating material is obtained by coating the mixture obtained by the above method on a transparent film, glass, or the like using a bar coater, a doctor blade, a spin coater, a die coater, a reverse coater, a spray, or the like. Can be obtained.

The plant to which the coating material of the present invention can be applied is not particularly limited.
Cucurbitaceae, Leguminosae, Rosaceae, Brassicaceae, Asteraceae, Umbelliferae, Acalyptaceae, Gramineae, Ukogi, Lamiaceae, Malvaceae, Zingiberaceae, Nymphalidaceae, or Araceae Vegetables, Asteraceae, Rosaceae , Araceae, Papilionidae, Brassicaceae, Isophoridae, Gentianaceae, Scrophulariaceae, Legumes, Buttons, Iridaceae, Solanaceae, Amaryllidaceae, Orchids, Agave, Cornus, Rubiaceae, Salix, Magnolia Family, ericaceae, oleaceae, primrose, sycamoreaceae, lamiaceae, anthracaceae, crassulaceae, buttercup family, iwatobacco family, cactiaceae,
Fernaceae, Astragalus, Mulberry, Astragalus, Pineapple, Asperillaceae, Euphorbiaceae, Saxifragaceae, Akabana, Malvaceae, Myrtaceae, Camellia, Oshirobana, or roses, grape, It is a fruit tree such as mulberry family, oyster family, ericaceae family, akebi family, striated family, passifloraceae, citrus family, urushi family, pineapple family, and myrtaceae family.

As a method of applying the coating material of the present invention to a horticultural facility, a method of covering the entire surface of a plant with the coating material or a method capable of covering at least one surface on which light is incident can be used. It is not limited. For example, a method of forming a glass chamber and a plastic chamber using a resin plate, a glass plate, and a film prepared by the above-described method, a method of using a pipe house, a lining and / or lining of a greenhouse, and a method of applying to a rain shield And a method used for a mulching film.

[0030]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples. [Example 1] 1. Trial production of test film Trial production of near infrared radiation shielding film PF-1 Tin oxide fine powder toluene dispersion (Sumitomo Osaka Cement: S
TS-500 Tin oxide content: 50 mass%) 60 parts of acrylate monomer (Nippon Kayaku: KAYARAD)
DPHA) 23 parts, dispersant 2 parts, vinylpyrrolidone 2
Parts, toluene 10 parts, KAYACURE DETX-S
0.25 part and KAYACURE EPA 0.5 part were mixed to prepare a photopolymerizable coating solution. Easy adhesion P
The above coating solution was applied on an ET film (# A4100, manufactured by Toyobo) at a rate of 10 g / m 2 using a bar coater, and then toluene was removed by evaporation in an oven at 80 ° C.
After the drying of the toluene was completed, an ultraviolet lamp having an intensity of 80 W / cm was irradiated from the coating film side for 20 seconds to polymerize and solidify the coating film. The obtained film was designated as PF-1. Test number PR1N8 Trial production of R / FR ratio correction film 0.15 parts of dye having maximum absorption wavelength of 575 nm (Sumiplast VIORET B manufactured by Sumitomo Chemical), polyester resin (Elitel E3210 manufactured by Unitika) 30
Parts, toluene 56 parts, methyl ethyl ketone 14 parts
Were mixed to obtain a coating liquid for a correction layer. On the surface of the PET film PF-1 coated with the infrared radiation blocking layer opposite to the surface coated with the near infrared radiation absorbing layer, NO. After applying a coating solution for correction using a Meyer bar of No. 8 and drying in an oven at 60 ° C. for 20 minutes, an R / FR ratio correction film was prototyped. Test number PR1N14 Trial production of R / FR ratio correction film The prototype was changed to 14 and the outside was made in the same way. Test No. Trial Production of PR4N8 R / FR Ratio Correction Film A trial production was performed in the same manner as described above, except that the type and amount of the added dye were changed as follows.
Dye having a maximum absorption wavelength of 623 nm (Sumiplast BLUE OA manufactured by Sumitomo Chemical) 0.03 part Test number PR
Prototype of 4N14 R / FR Ratio Correction Film A prototype was produced in the same manner except that the number was changed to 14. 2. Measurement of R / FR ratio of trial film The spectral transmittance of the trial film was measured, and the R / FR ratio was determined. The R / FR ratio was determined as follows. R / FR ratio = (average transmittance of 0.6 to 0.7 μm) /
(Average transmittance of 0.7 to 0.8 μm) The spectral transmittance curve is shown in FIG. Table 1 shows the results of photosynthetic effective radiation transmittance, solar radiation transmittance, and R / FR ratio of the prototype film.

[Table 1] Growth Test Using Prototype Film In a glass greenhouse, a young plant of tomato (variety: Fukuju No. 2) cultivated using a square pot was grown using the prototype film as a canopy during the first leaf development stage. The greenhouse temperature during growth was set to at least 25 degrees Celsius. The test period is December 2
It was from 5th to 6th January. After completion of the test, the live weight of the leaf stem was measured. Table 2 shows the measurement results.

[Table 2] As shown in Table 2, it can be seen that by providing the correction layer, the living weight is increased and the growth is promoted as compared with other cases using only the near-infrared radiation blocking film.

[0031]

[Brief description of the drawings]

FIG. 1 is a diagram showing a spectral transmittance curve of a prototype film.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C09D 201/00 C09D 201/00 F term (Reference) 2B024 DA04 DB01 2B029 EB03 EC03 EC04 EC09 EC14 4F100 AA17A AA25A AA28A AA33A AK01A AK42B AR00A AT00B BA02 BA03 BA06 CA13A DE01A GB01 JA20A JC00 JD10A JG01A YY00A 4J038 EA011 HA216 KA20 NA19 PB02 PC08

Claims (8)

[Claims] 1. The photosynthetic effective radiation transmittance of 0.4 to 0.7 μm is in the range of 50 to 90% and the solar radiation transmittance is 40 to 8
0%, and the ratio (R / F) between the average transmittance at a wavelength of 0.6 to 0.7 μm and the average transmittance at 0.7 to 0.8 μm.
R) is in the range of 0.90 to 1.02, the near-infrared radiation shielding coating material having improved plant growth. 2. The near-infrared radiation shielding coating material according to claim 1, wherein the layer having a near-infrared radiation shielding function is formed on at least one surface of a base material constituting the coating material. 3. A layer having a near-infrared radiation blocking function, an average transmittance at a wavelength of 0.6 to 0.7 μm, and an average transmittance of 0.7 to 0.8 μm.
2. The near-infrared radiation shielding coating material according to claim 1, wherein layers for correcting the average transmittance ratio (R / FR) are separated. 4. A near-infrared radiation blocking function and a wavelength of 0.6 to 0.1.
The near-infrared radiation shielding coating material according to claim 1, wherein the layers for correcting the ratio (R / FR) of the average transmittance of 7 µm and the average transmittance of 0.7 to 0.8 µm are the same. 5. A material having a near-infrared radiation blocking function, wherein the material having a near-infrared radiation blocking function is a conductive metal oxide fine powder having a primary particle diameter of 1 to 30 nm. The near-infrared radiation shielding coating material according to any one of claims 1 to 4, wherein 6. The conductive metal oxide fine powder comprises tin oxide,
The near-infrared radiation shielding coating material according to claim 5, wherein the coating material is made of a single substance or a mixture of indium oxide, zinc oxide, and zinc antimonate. 7. In order to correct the ratio (R / FR) between the average transmittance at a wavelength of 0.6 to 0.7 μm and the average transmittance at a wavelength of 0.7 to 0.8 μm, the maximum absorption wavelength is 0.5 to 0.7 μm. 7. The composition according to claim 1, further comprising a dye in the range of 0.7 [mu] m.
The near-infrared radiation shielding coating material according to any one of the above items 8. The near-infrared radiation shielding coating material according to claim 1, wherein the near-infrared radiation shielding coating material is a resin film or a resin plate.