JP2009096952A - Infrared shielding film-forming coating material and infrared shielded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared shielding film-forming coating material which is hard to cause coating defects such as cissing and nonuniformity in coating on the surface of a transparent substrate such as a resin film, and to provide an infrared shielded product obtained by using this coating material. <P>SOLUTION: The infrared shielding film-forming coating material comprises a hexaboride particle constituted of at least one element selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr and Ca, and boron, at least one surfactant selected from cationic, anionic, amphoteric and nonionic surfactants, and a binder resin which are dispersed or dissolved in a solvent. The infrared shielded product is constituted of a transparent substrate and an infrared shielded film formed on the surface of the substrate with the use of the above coating material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coating material for forming an infrared shielding film in which hexaboride fine particles that are transparent in the visible light region and absorb in the near infrared region are dispersed in a solvent, and in particular, applied to a transparent substrate such as a resin film. The present invention relates to an improvement in a coating material for forming an infrared shielding film in which coating film defects such as repellency, leakage, and unevenness are unlikely to occur, and to an infrared shielding body produced using this coating material.

  As this type of infrared shielding film forming paint, at least selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr, Ca A paint in which hexaboride particles composed of a kind of element and boron are dispersed in a solvent such as an organic solvent (coating solution for solar shading film) has been proposed by the present applicant (see Patent Document 1). Patent Document 1 has already proposed an infrared shielding film (sunlight shielding film) constituted by applying the paint (a coating solution for solar radiation shielding film) on the surface of a transparent substrate such as a resin film.

  Furthermore, for the purpose of improving the water resistance of the hexaboride particles, the applicant of the present invention is the inorganic borate having the surface of the hexaboride particles, a silazane-based treatment agent, a chlorosilane-based treatment agent, and an alkoxy group in the molecular structure. Patent Document 2 proposes a method of coating with a surface treatment agent containing silicon selected from a treatment agent and an organic treatment agent having an alkoxy group at the molecular end or side chain.

  By the way, the infrared shielding film (sunlight shielding film) in which hexaboride particles are dispersed in the film is, as described above, an infrared shielding film-forming paint (for solar radiation shielding film) on the surface of a transparent substrate such as a resin film. It is manufactured by applying a coating liquid).

  As a method for applying the infrared shielding film-forming coating material on the transparent substrate surface, gravure roll coating method, reverse roll coating method, dip coating method, blade coating method, air knife coating method, wire block coating method, reblocks Known methods such as a coating method, a reblock roll coating method, an extrusion coating method, a rod coating method, a wire bar coating method, a slide coating method, and a curtain coating method are used.

  However, when the above-described coating material for forming an infrared shielding film is applied onto the surface of the transparent substrate using these known coating methods, the surface of the transparent substrate may be repelled or missing depending on the composition of the coating material or the surface state of the transparent substrate. There has been a problem that coating film defects and coating unevenness (transverse unevenness) continuously generated in the width direction with respect to the coating direction may be remarkably exhibited, and the performance required for the infrared shielding film is not satisfied.

  One of the methods for improving the coating property is a surface treatment for the substrate surface (coating surface). As this surface treatment method, ultraviolet treatment, corona discharge treatment, glow discharge treatment, flame treatment, high frequency treatment, plasma treatment are performed. Laser treatment, mechanical treatment, mixed acid treatment, ozone oxidation treatment and the like are known, and in particular, corona discharge treatment and glow discharge treatment are widely used industrially. And about a corona discharge process, there exists the method described in patent documents 3-4, for example, and there exists a method described in patent documents 5-6 also about the glow discharge process, for example.

However, these surface treatment methods require heating and cooling of the base material in the course of the surface treatment, so that the base material itself is easily plastically deformed, and the flatness of the base material surface is impaired. A molecular weight body (such as an additive or a monomer component of a resin film as a base material) may be deposited on the surface of the base material, thereby deteriorating transparency and blocking resistance. Furthermore, since it is difficult to deal with various base materials and coating compositions only by surface treatment of these base materials, the coating unevenness cannot be completely eliminated.
JP 2000-169765 A JP 2003-277045 A Japanese Patent Publication No. 48-5043 Japanese Examined Patent Publication No. 47-51905 Japanese Patent Publication No. 35-7578 Japanese Patent Publication No. 36-10336

  The present invention has been made paying attention to such problems, and the problem is that when coated on a transparent substrate such as a resin film, coating film defects such as repellency, leakage, unevenness, etc. are caused. An object of the present invention is to provide a coating material for forming an infrared shielding film which is difficult, and to provide an infrared shielding body manufactured using the coating material.

  Therefore, the present inventors have intensively studied in order to solve the above-mentioned problems. As a result, at least one surfactant selected from a cation, an anion, a zwitterion or a nonionic surfactant in the infrared shielding film-forming coating material. It has been found that the above-mentioned coating film defects such as repellency, removal, unevenness and the like are prevented by adding and dispersing. Furthermore, an infrared shielding body composed of an infrared shielding film formed using an infrared shielding film-forming coating material in which the surfactant is dispersed and a transparent substrate has a precise in-plane uniformity, It has also been found that it is transparent in the visible light region and has excellent shielding properties in the near infrared region. The present invention has been completed by such technical discovery.

That is, the invention according to claim 1
Assuming a paint for forming an infrared shielding film,
Hexaboron composed of at least one element selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr, Ca and boron It is characterized in that the compound particles, at least one surfactant selected from a cationic, anionic, amphoteric or nonionic surfactant, and a binder resin are dispersed or dissolved in a solvent.

Next, the invention according to claim 2
On the premise of the infrared shielding film forming paint according to the invention of claim 1,
The surfactant is a silicone surfactant composed of a silicone compound in which the hydrophobic group is dimethylpolysiloxane and the hydrophilic group is polyalkylene oxide,
The invention according to claim 3
On the premise of the infrared shielding film forming paint according to the invention of claim 2,
The silicone surfactant is one or more selected from the following chemical formulas (1) to (6),

［但し、化学式（１）〜（６）中において、Ｒはアルキル基または水素を示し、Ｒ’はアルキレン基を示し、また、ａ、ｂはそれぞれ１〜５００の整数、ｍ、ｎはそれぞれ１〜２００の整数である。］

[In the chemical formulas (1) to (6), R represents an alkyl group or hydrogen, R ′ represents an alkylene group, a and b are each an integer of 1 to 500, and m and n are 1 respectively. It is an integer of ~ 200. ]

The invention according to claim 4
On the premise of the infrared shielding film forming paint according to any one of claims 1 to 3,
The addition amount of the surfactant is 0.001 to 10 parts by weight when the entire coating is 100 parts by weight,
The invention according to claim 5
Based on the infrared shielding film-forming paint according to any one of claims 1 to 4,
The hexaboride particles are hexaboride fine particles having an average primary particle diameter of 10 nm to 1 μm.

Furthermore, the invention according to claim 6 provides
Assuming an infrared shield,
An infrared shielding film obtained by coating the coating material for forming an infrared shielding film according to any one of claims 1 to 5 on a surface of a transparent substrate, and forming the formed coating film into a plate shape, a film shape, or a thin film shape. And the transparent substrate.

  The coating material for forming an infrared shielding film according to the present invention comprises hexaboride particles, at least one surfactant selected from a cation, an anion, a zwitterion or a nonionic surfactant, and a binder resin in a solvent. It is characterized by being dispersed or dissolved.

  When the infrared shielding film-forming paint according to the present invention is applied to a transparent substrate such as a resin film, coating film defects such as repellency, leakage, and unevenness are unlikely to occur. The infrared shielding body composed of the formed infrared shielding film and a transparent substrate has a precise in-plane uniformity, and is transparent in the visible light region and has excellent shielding properties in the near infrared region. Has an effect.

  Hereinafter, embodiments of the present invention will be described in detail.

  First, the infrared shielding film forming paint according to the present invention is selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr, and Ca. A hexaboride particle composed of at least one element and boron, at least one surfactant selected from a cationic, anionic, zwitterionic or nonionic surfactant, and a binder resin in a solvent. It is characterized by being dispersed or dissolved.

1. Hexaboride Particles As described above, hexaboride particles applied to the coating material for forming an infrared shielding film of the present invention are Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er. , Tm, Yb, Lu, Sr, Ca and at least one element selected from boron and boron, YB ₆ , LaB ₆ , CeB ₆ , PrB ₆ , NdB ₆ , SmB ₆ , EuB ₆ , GdB ₆ , TbB ₆ , DyB ₆ , HoB ₆ , ErB ₆ , TmB ₆ , YbB ₆ , LuB ₆ , SrB ₆ , and CaB ₆ .

  Here, the particle diameter of the hexaboride particles is appropriately set within the range of 10 nm to 1 μm depending on the intended use. For example, when applied to an optical selective transmission film (a film that transmits light in the visible light region and shields light in the near infrared region), it is necessary to consider scattering by particles. When importance is attached to transparency, the particle size of hexaboride particles is 200 nm or less, preferably 100 nm or less. The reason for this is that if the particle size of the fine particles exceeds 200 nm, the light in the visible light region of 380 nm to 780 nm is scattered by geometrical scattering or Mie scattering to become a frosted glass, and clear transparency cannot be achieved. Because. When the particle diameter is 200 nm or less, the scattering is reduced and a Rayleigh scattering region is obtained. In the Rayleigh scattering region, the scattered light decreases in inverse proportion to the sixth power of the particle diameter, so that the scattering is reduced and the transparency is improved as the particle diameter decreases. Further, when the thickness is 100 nm or less, the scattered light is preferably very small. However, depending on the use of the infrared shielding film, there is a field where such transparency is not required, and the thickness is appropriately set within a range of 10 nm to 1 μm.

  For the purpose of improving the water resistance of hexaboride particles, the above-mentioned silazane-based treating agent, chlorosilane-based treating agent, inorganic-based treating agent having an alkoxy group in the molecular structure, and alkoxy group having a molecular terminal or side chain. When coating with a silicon-containing surface treatment agent selected from organic treatment agents in the case where the particle size of hexaboride particles is 200 nm or less, fine use a ball mill, a sand mill, an ultrasonic homogenizer or the like. Particle agglomerates are crushed in advance in a non-aqueous solvent, and the surface treatment agent is added to the uniformly dispersed slurry to act on the particle surface, or the surface treatment agent is crushed during the crushing treatment. It is preferable to adopt a method in which the surface of the particles is coated by simultaneously adding.

  When the hexaboride particles of the infrared shielding film forming paint according to the present invention are applied to constitute an optical filter, light in the vicinity of 1000 nm is reflected and absorbed and shielded, and light of 380 nm to 780 nm is transmitted. It is possible to provide characteristics. Such a characteristic is derived from the electronic structure peculiar to hexaboride. In particular, since there is plasmon resonance of free electrons near 1000 nm, light in this region is broadly absorbed and reflected.

  Furthermore, since there is little absorption in a visible light region of 380 nm to 780 nm, it is suitable not only for the use of an optical filter but also for other uses that transmit the visible light region and shield near infrared rays. For example, as an infrared shielding body composed of an infrared shielding film formed using the infrared shielding film forming paint according to the present invention and a transparent substrate, if applied to a window material of a house or a car, a greenhouse, etc. It has an advantage that the near infrared ray in the vicinity of 1000 nm of the light beam is shielded and a high heat insulating effect is obtained, and at the same time, visibility is ensured.

It should be noted that the amount of hexaboride particles used (in the amount of filler) in the infrared shielding body such as an optical filter or window material can be appropriately changed according to the required characteristics, and heat insulating optics that transmits the visible light region and shields near infrared rays. In the case of a filter, for example, in LaB ₆ , an effective heat insulating effect is obtained when the filler amount per 1 m ² is 0.01 g or more. Although the upper limit of the amount used (filler amount) depends on the optical characteristics to be obtained, it is possible to absorb and shield about 50% of the heat energy of solar rays at 0.1 g per m ² , and the heat insulation efficiency per unit weight It is confirmed that it is expensive.

  Moreover, it is preferable from the viewpoint of improving the weather resistance of the particles that the surface of the hexaboride particles is coated with an oxide containing one or more of Si, Ti, Zr, and Al.

2. Surfactant It is preferable to control the wettability and leveling property of the coating material with respect to the substrate in order to obtain good coating properties without the above-mentioned repelling, removal, unevenness and the like. In the physical properties of the paint, the leveling property is improved as the surface tension is high, the viscosity is low, and the drying speed is low, and the wettability is improved by decreasing the contact angle with the substrate surface. In the case of a paint composed of various solvents, in the coating film forming process, the paint is dried and solidified while changing its composition as needed. What is important in the applicability is whether the lipophilicity / hydrophilicity balance (HLB) of the composition immediately before solidification has better surface activity than the physical properties of the coating. However, in addition to surface tension and viscosity (applicability), solvents used in paints are polar (related to filler dispersibility), boiling point and vapor pressure (related to drying speed), resin solubility, and safety. Therefore, it is often difficult to obtain good coating properties by simply adjusting the solvent composition.

  One effective means for controlling the surface tension of the coating material with respect to the substrate is the addition of a surfactant applied in the present invention. The surfactant has a hydrophilic part and a lipophilic part in one molecule, and forms a micelle having the hydrophilic part on the outside in water and a micelle which is reversed inside and outside in a nonpolar solvent. Therefore, since these micelles can incorporate substances with different properties from the external environment, in the presence of a surfactant, a mixture of both polar and nonpolar substances including fillers such as binders and hexaboride particles is mixed. The state becomes uniform and the interfacial activity (surface tension) of the paint with respect to the substrate surface changes.

  In order for the paint to exhibit good surface activity, the ratio of the lipophilic group (lipophilic part) and the hydrophilic group (hydrophilic part) in the same molecule is important, and if either one becomes too large, the interface Activity is lost. That is, in the surfactant, the balance between the hydrophilic group and the lipophilic group is important, and the strength of the active action is quantitatively shown by the HLB value.

  The purpose of use of the surfactant in the present invention is to volatilize and remove the solvent in order from a low boiling point solvent of [coating liquid (coating liquid)] [thin liquid film] [dry film]. ) In the process of changing the composition, the polar liquid and the non-polar solvent are uniformly mixed until the liquid composition of the coating liquid (paint liquid) loses its fluidity. The purpose is to optimize the energy, that is, to improve the liquid properties.

  On the other hand, Patent Document 1 described above describes that various surfactants are adsorbed on the fine particles in order to further improve the dispersion stability of the fine particles in the paint. However, the purpose of use of this surfactant is to improve the lyophilicity (wetting) of the particles by modifying the surface of the particles themselves and changing the HLB (hydrophilic / lipophilic balance) of the particle surface. In some cases, a polymer chain is introduced to stabilize the fine particles in the dispersion by steric hindrance between the particles. Therefore, the purpose of use of the surfactant in the present invention is different.

  In the present invention, regarding the function of maintaining the dispersibility of the fine particles in the paint, a polymer resin having a functional group added separately is responsible.

  By the way, surfactants are roughly classified into ionic (cationic / anionic / zwitteric) hydrophilic parts and nonionic (nonionic) parts. It is classified into a system. The ionic surfactant means a surfactant that dissociates from a counter ion in a liquid and ionizes the main chain. Here, the main chain indicates the side having a higher molecular weight after dissociation.

  Specific examples of the anionic surfactant include surfactants composed of fatty acid salts, sulfate esters, sulfonates, phosphate esters, and the like. Specific examples of the cationic surfactant include quaternary ammonium salt type surfactants and amine salt type surfactants. A zwitterionic (both ions) surfactant has both an anionic site and a cationic site in the molecule, and has a structure in which each of the above is combined. Type surfactants, betaine type surfactants, amine oxide type surfactants and the like. Furthermore, nonionic (nonionic) surfactants have a hydrophilic portion that is not ionized, and specifically include ether type surfactants, polyhydric alcohol type surfactants, ester type surfactants, polyvalent surfactants. In addition to alcohol ester surfactants and alkanolamide surfactants, nonionic fluorine surfactants (perfluoroalkylethylene oxide adducts, etc.), nonionic silicone surfactants and the like can be mentioned.

  When forming an infrared shielding film on the surface of a transparent substrate using a coating material for forming an infrared shielding film, at least one surfactant selected from the cation, anion, amphoteric or nonionic surfactant is contained in a solvent. By dispersing the coating material in the surface, the wettability of the paint on the surface of the base material is improved, thereby improving the coating property, and the infrared shielding film having a precise in-plane uniformity without coating film defects such as repellency, leakage, unevenness, etc. Can be obtained.

  As the surfactant applied in the present invention, either an ionic (cationic, anionic or amphoteric) surfactant or a nonionic surfactant can be used. A silicone surfactant that is an agent is particularly desirable.

  When the above ionic surfactant is used, depending on the type of solvent and binder resin used, surfactant ions dissociated in the solution displace the electrostatic repulsion between dispersed hexaboride particles. Alternatively, the affinity between the hexaboride particles and the solvent may be changed by adsorbing the surfactant on the surface of the hexaboride particles. Depending on the composition of the coating, the hexaboride particles are likely to aggregate in the dispersion, which may cause problems such as clouding of the coating when the coating is formed. On the other hand, since the nonionic surfactant has a hydrophilic group that is not ionized, the surfactant is not electrostatically adsorbed on the surface of the hexaboride particles to change the dispersibility. However, sufficient surface active effects may not be obtained with the low molecular weight type.

  The silicone-based surfactants are mainly nonionic and exhibit an excellent surfactant effect due to their high solubilizing power in nonpolar solvents. And since the said silicone type surfactant which is a polymeric surfactant can change the lipophilicity and hydrophilicity balance (HLB) according to the functional group, molecular skeleton, and molecular weight of a molecular side chain or a terminal, The optimum one for each solvent system can be selected and used. Furthermore, even if the reactivity to the filler surface is high, it is difficult to deteriorate the dispersibility of the filler due to the steric hindrance effect of the polymer, and bleeding (exudation from the coating film surface over time) and foaming due to excessive addition of surfactant. There is an advantage that there are few (causes of film defects).

  As the silicone surfactant that is a polymer surfactant, a silicone compound in which the hydrophobic group is dimethylpolysiloxane and the hydrophilic group is polyalkylene oxide can be used. Specifically, when one or more silicone surfactants represented by the following chemical formulas (1) to (6) are applied, the dispersibility of hexaboride particles in the coating material for forming an infrared shielding film is impaired. Thus, the wettability of the coating material with respect to the surface of the transparent substrate is improved, and an infrared shielding film having a precise in-plane uniformity without a coating film defect can be obtained.

［但し、化学式（１）〜（６）中において、Ｒはアルキル基または水素を示し、Ｒ’はアルキレン基を示し、また、ａ、ｂはそれぞれ１〜５００の整数、ｍ、ｎはそれぞれ１〜２００の整数である。］

[In the chemical formulas (1) to (6), R represents an alkyl group or hydrogen, R ′ represents an alkylene group, a and b are each an integer of 1 to 500, and m and n are 1 respectively. It is an integer of ~ 200. ]

  Here, the addition amount of the surfactant in the coating material for forming an infrared shielding film is desirably set in the range of 0.001 to 10 parts by weight when the entire coating is 100 parts by weight, A range of 5 parts by weight is particularly desirable. If the addition amount is less than 0.001 part by weight, the wettability to the substrate and the leveling property at the time of drying may not be sufficient, and if it exceeds 10 parts by weight, the addition effect does not increase so much and is economically disadvantageous. This is because there is a case.

3. Solvent The solvent applied to the infrared shielding film-forming coating material of the present invention is not particularly limited, and a known organic solvent can be used. Specifically, alcohol solvents such as methanol (MA), ethanol (EA), 1-propanol (NPA), isopropanol (IPA), butanol, pentanol, benzyl alcohol, diacetone alcohol, acetone, methyl ethyl ketone (MEK) , Ketone solvents such as methyl propyl ketone, methyl isobutyl ketone (MIBK), cyclohexanone, isophorone, ester solvents such as 3-methyl-methoxy-propionate (MMP), ethylene glycol monomethyl ether (MCS), ethylene glycol monoethyl ether (ECS), ethylene glycol isopropyl ether (IPC), propylene glycol methyl ether (PGM), propylene glycol ethyl ether (PE), propylene glycol methyl Glycol derivatives such as ether acetate (PGMEA), propylene glycol ethyl ether acetate (PE-AC), formamide (FA), N-methylformamide, dimethylformamide (DMF), dimethylacetamide, N-methyl-2-pyrrolidone ( Amides such as NMP), aromatic hydrocarbons such as toluene and xylene, and halogenated hydrocarbons such as ethylene chloride and chlorobenzene. Among them, organic solvents with low polarity are preferable, and particularly highly hydrophobic ones such as ketones such as MIBK and MEK, aromatic hydrocarbons such as toluene and xylene, glycol ether acetates such as PGMEA and PE-AC, and the like. preferable. These solvents can be used alone or in combination of two or more.

4). Binder resin The paint for forming an infrared shielding film needs to contain a binder component, and a known curable resin can be used as the binder component. For example, a thermosetting resin, a UV curable resin, an electron beam curable resin, or the like can be selected according to the purpose. And as thermosetting resin, resin using the crosslinking reaction of prepolymers, such as a melamine resin, a urethane resin, an epoxy resin, can be mentioned. Examples of thermosetting, UV curable, or electron beam curable resins include polyfunctional polymerizable unsaturated compounds. For example, polyfunctional acrylate or methacrylate [pentaerythritol (meth) acrylate or dipentaerythritol hexa (meth) ) Acrylate etc.]. Furthermore, it is preferable to add a filler, a polymerization initiator, and a polymerization accelerator to these binder components as necessary.

5). Transparent substrate The material of the transparent substrate in the present invention is not particularly limited as long as it is a transparent body, and glass, a resin sheet, or a resin film is preferably used. The resin sheet or resin film is not particularly limited as long as it does not cause problems in the surface state and durability of the required sheet or film. For example, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate Cellulose polymers such as diacetyl cellulose and triacetyl cellulose, polycarbonate polymers, acrylic polymers such as polymethyl methacrylate, styrene polymers such as polystyrene and acrylonitrile / styrene copolymers, polyethylene, polypropylene, and cyclic or norbornene structures Polyolefins, olefin polymers such as ethylene / propylene copolymers, vinyl chloride polymers, amide polymers such as aromatic polyamides, imide polymers, Ruphone polymer, polyether sulfone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer Furthermore, the sheet | seat or film which consists of transparent polymers, such as these binary-type, ternary-type various copolymers, a graft copolymer, and a blend, is mentioned. In particular, a polyester biaxially oriented film such as polyethylene terephthalate, polybutylene terephthalate, or polyethylene-2,6-naphthalate is preferable in terms of mechanical properties, optical properties, heat resistance, and economy. The polyester biaxially oriented film may be a copolyester.

6). Preparation and application method of infrared shielding film-forming coating material The infrared shielding film-forming coating material of the present invention is prepared by, for example, dispersing the hexaboride particles in a solvent, adding the surfactant to the solvent, and further dissolving the binder resin. , Can be prepared by mixing. Also, the infrared shielding film is formed by applying the prepared coating material for forming an infrared shielding film to the surface of a transparent substrate such as a resin film, and evaporating the solvent of the applied coating material and curing the binder resin by a predetermined method. Can be formed.

  The coating method for forming the infrared shielding film may be any method as long as the coating material can be uniformly applied to the surface of the transparent substrate such as a resin film. For example, the bar coating method, the gravure roll coating method, the reverse roll coating Method, dip coating method, blade coating method, air knife coating method, wire block coating method, reblocks coating method, reblocking roll coating method, extrusion coating method, rod coating method, wire bar coating method, slide coating method and curtain Examples thereof include a coating method.

7). Infrared shielding body The infrared shielding body of the present invention is obtained by coating the coating material for forming the infrared shielding film on the surface of a transparent substrate such as a resin film, and forming the formed coating film into a plate shape, a film shape, or a thin film shape. The infrared shielding film and the transparent substrate.

  The infrared shielding body of the present invention is free of coating film defects due to repellency, removal, coating unevenness, etc. of the coating material for forming an infrared shielding film, and has a precise in-plane uniformity. Is transparent and has excellent shielding properties in the near infrared region. Therefore, it can be suitably used as an optical filter or the like that requires a function of absorbing near infrared rays.

  Examples of the present invention will be specifically described below.

13 parts by weight of LaB ₆ powder, 74 parts by weight of toluene and 13 parts by weight of a dispersant were mixed and subjected to a dispersion treatment to obtain a dispersion liquid (A liquid) having an average dispersed particle diameter of 80 nm.

  10 parts by weight of this liquid A, 56.64 parts by weight of toluene, 33.33 parts by weight of UV curable resin for hard coat [manufactured by Toagosei Co., Ltd., trade name: UV3701], silicone represented by the above chemical formula (6) A coating material for forming an infrared shielding film according to Example 1 was prepared by mixing 0.03 part by weight of a surfactant (manufactured by Nihon Unicar, trade name: FZ-3703).

  Next, the coating material for forming an infrared shielding film according to Example 1 was applied onto a PET film (100 μm thickness) using a roll coater to form a coating film.

  The coating film was dried at 80 ° C. for 60 seconds to evaporate the solvent, and then cured with a high-pressure mercury lamp to form an infrared shielding film. An infrared shielding film (infrared ray) composed of the infrared shielding film and a PET film. A shield was obtained.

The surface of the infrared shielding film was visually observed and judged according to the following evaluation criteria.
[Crossing unevenness]
○: Not at all. Δ: Partially confirmed. X: It can be confirmed clearly.
[Nuke (with or without pinholes with a diameter of 1 to 3 mm)]
○: The number of leakage is 5 / m ² or less. Δ: Less than 50 / m ² . X: 50 pieces / m ² or more.

  And when the optical characteristic of the infrared shielding film which concerns on Example 1 was measured, the visible light transmittance | permeability is 50% and it was confirmed that the light of visible region is fully permeate | transmitted. Moreover, haze was 0.8% and showed the outstanding transparency.

  Furthermore, when the infrared shielding film obtained according to the said evaluation criteria was determined, the crossing unevenness was not seen ((circle)), there were few leaks ((circle)), and the favorable applicability | paintability was exhibited.

  10.00 parts by weight of the above liquid A, 56.67 parts by weight of toluene, UV curable resin for hard coat [manufactured by Toagosei Co., Ltd., trade name UV3701] 33.33 parts by weight, represented by chemical formula (6) A silicone surfactant (trade name: FZ-3703, manufactured by Nihon Unicar Co., Ltd.) was mixed in an amount of 0.0015 part by weight to prepare an infrared shielding film-forming coating material according to Example 2.

  Next, the coating material for forming an infrared shielding film according to Example 2 was applied onto a PET film (100 μm thickness) using a roll coater to form a coating film.

  The coating film was dried at 80 ° C. for 60 seconds to evaporate the solvent, and then cured with a high-pressure mercury lamp to form an infrared shielding film. An infrared shielding film (infrared ray) composed of the infrared shielding film and a PET film. A shield was obtained.

  Next, when the optical characteristics of the infrared shielding film according to Example 2 were measured, the visible light transmittance was 52%, and it was confirmed that the light in the visible light region was sufficiently transmitted. Moreover, haze was 0.7% and showed the outstanding transparency.

  Furthermore, when the infrared shielding film obtained according to the said evaluation criteria was determined, the crossing unevenness was not seen ((circle)), there were few leaks ((circle)), and the favorable applicability | paintability was exhibited.

  10.00 parts by weight of the liquid A, 46.67 parts by weight of toluene, UV curable resin for hard coat [manufactured by Toagosei Co., Ltd., trade name UV3701] 33.33 parts by weight, represented by chemical formula (6) A coating for forming an infrared shielding film according to Example 3 was prepared by mixing 10.00 parts by weight of a silicone-based surfactant (trade name: FZ-3703, manufactured by Nihon Unicar).

  Next, the coating material for forming an infrared shielding film according to Example 3 was applied on a PET film (100 μm thick) using a roll coater to form a coating film.

  The coating film was dried at 80 ° C. for 60 seconds to evaporate the solvent, and then cured with a high-pressure mercury lamp to form an infrared shielding film. An infrared shielding film (infrared ray) composed of the infrared shielding film and a PET film. A shield was obtained.

  Next, when the optical characteristics of the infrared shielding film according to Example 3 were measured, the visible light transmittance was 49%, and it was confirmed that the light in the visible light region was sufficiently transmitted. Moreover, the haze was 1.3%, which showed good transparency.

  Furthermore, when the infrared shielding film obtained according to the above-mentioned evaluation criteria was judged, transverse unevenness was partially observed (Δ), but there was little missing (Δ) and a relatively good coating property was exhibited.

[Comparative Example 1]
Comparative Example 1 was prepared by mixing 10.00 parts by weight of the liquid A, 57.00 parts by weight of toluene, and 33.33 parts by weight of an ultraviolet curable resin for hard coat [manufactured by Toagosei Co., Ltd., trade name UV3701]. Such a coating material for forming an infrared shielding film was prepared.

  Next, the coating material for forming an infrared shielding film according to Comparative Example 1 was applied onto a PET film (100 μm thick) using a roll coater to form a coating film.

  The coating film was dried at 80 ° C. for 60 seconds to evaporate the solvent, and then cured with a high-pressure mercury lamp to form an infrared shielding film. An infrared shielding film (infrared ray) composed of the infrared shielding film and a PET film. A shield was obtained.

  Next, when the optical characteristic of the infrared shielding film according to Comparative Example 1 was measured, the visible light transmittance was 50%, and it was confirmed that the light in the visible light region was sufficiently transmitted. Moreover, haze was 0.8% and showed the outstanding transparency.

  However, when the infrared shielding film obtained according to the above evaluation criteria was determined, transverse unevenness was clearly observed (×), there were many spots (×), and the applicability was poor.

  10.00 parts by weight of the above liquid A, 56.67 parts by weight of toluene, UV curable resin for hard coat [manufactured by Toagosei Co., Ltd., trade name UV3701] 33.33 parts by weight, represented by chemical formula (6) An infrared shielding film-forming coating material according to Example 4 was prepared by mixing 0.0005 parts by weight of a silicone-based surfactant (trade name: FZ-3703, manufactured by Nippon Unicar Co., Ltd.).

  Next, the coating material for forming an infrared shielding film according to Example 4 was applied onto a PET film (100 μm thickness) using a roll coater to form a coating film.

  The coating film was dried at 80 ° C. for 60 seconds to evaporate the solvent, and then cured with a high-pressure mercury lamp to form an infrared shielding film. An infrared shielding film (infrared ray) composed of the infrared shielding film and a PET film. A shield was obtained.

  Next, when the optical characteristic of the infrared shielding film according to Example 4 was measured, the visible light transmittance was 51%, and it was confirmed that the light in the visible light region was sufficiently transmitted. Moreover, haze was 0.7% and showed the outstanding transparency.

  Furthermore, when the infrared shielding film obtained according to the above-mentioned evaluation criteria was determined, the crossing unevenness was improved from Comparative Example 1 (Δ), but there was a little more missing (Δ close to x) compared to other examples. The applicability was slightly inferior.

  10.00 parts by weight of the above liquid A, 44.67 parts by weight of toluene, UV curable resin for hard coat [manufactured by Toagosei Co., Ltd., trade name UV3701] 33.33 parts by weight, represented by chemical formula (6) A silicone surfactant (trade name: FZ-3703, manufactured by Nippon Unicar Co., Ltd.) was mixed with 12.00 parts by weight to prepare an infrared shielding film-forming paint according to Example 5.

  Next, the coating material for forming an infrared shielding film according to Example 5 was applied onto a PET film (100 μm thickness) using a roll coater to form a coating film.

  The coating film was dried at 80 ° C. for 60 seconds to evaporate the solvent, and then cured with a high-pressure mercury lamp to form an infrared shielding film. An infrared shielding film (infrared ray) composed of the infrared shielding film and a PET film. A shield was obtained.

  Next, when the optical characteristic of the infrared shielding film according to Example 5 was measured, the visible light transmittance was 53%, and it was confirmed that the light in the visible light region was sufficiently transmitted. However, the haze was as high as 2.2%, which was slightly poorer than other examples.

  Furthermore, when the infrared shielding film obtained according to the above-mentioned evaluation criteria was determined, the crossing unevenness was improved from Comparative Example 1 (Δ), but there was a little more missing (Δ close to x) compared to other examples. The applicability was slightly inferior.

  The infrared shielding body composed of the infrared shielding film formed using the infrared shielding film forming paint according to the present invention and a transparent substrate has a precise in-plane uniformity and is transparent in the visible light region. In the near infrared region, it has excellent shielding properties. Therefore, the infrared shielding body obtained by using the coating material for forming an infrared shielding film according to the present invention is an industry used for optical filters and window materials that transmit light in the visible light region and shield light in the near infrared region. Has the above applicability.

Claims (6)

  Hexaboron composed of at least one element selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr, Ca and boron Infrared shielding film, characterized in that a compound particle, at least one surfactant selected from cationic, anionic, amphoteric or nonionic surfactant, and a binder resin are dispersed or dissolved in a solvent. Forming paint.   2. The infrared shielding film formation according to claim 1, wherein the surfactant is a silicone surfactant composed of a silicone compound in which a hydrophobic group is dimethylpolysiloxane and a hydrophilic group is polyalkylene oxide. Paint. 3. The infrared shielding film-forming paint according to claim 2, wherein the silicone-based surfactant is at least one selected from the following chemical formulas (1) to (6).

[In the chemical formulas (1) to (6), R represents an alkyl group or hydrogen, R ′ represents an alkylene group, a and b are each an integer of 1 to 500, and m and n are 1 respectively. It is an integer of ~ 200. ]   4. The infrared shielding film-forming coating material according to claim 1, wherein the amount of the surfactant added is 0.001 to 10 parts by weight when the entire coating material is 100 parts by weight. . The infrared shielding film-forming paint according to any one of claims 1 to 4, wherein the hexaboride particles are hexaboride fine particles having an average primary particle diameter of 10 nm to 1 µm.   An infrared shielding film obtained by coating the coating material for forming an infrared shielding film according to any one of claims 1 to 5 on a surface of a transparent substrate, and forming the formed coating film into a plate shape, a film shape, or a thin film shape. And an infrared shielding body comprising the transparent substrate.