JP2005179521A - Insolation-screening resin material and particulate dispersion for insolation screening used for production of insolation-screening resin material, and insolation-screening resin base material and insolation-screening composite material obtained by using insolation-screening resin material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insolation-screening resin material with high insolation-screening function, high transmission performance of a visible light region and expressing blue color tone, and a particulate dispersion for insolation screening used for producing the insolation-screening resin material, and an insolation-screening resin base material and an insolation-screening composite material both obtained by using the insolation-screening resin material. <P>SOLUTION: The insolation-screening resin material is characterized in that the particulate for insolation screening dispersed in a resin component is constituted of rhenium trioxide having ≤200 nm average particle diameter, and the powder color by diffuse reflection light in L<SP>*</SP>a<SP>*</SP>b<SP>*</SP>color system expressed as L<SP>*</SP>=20-50; a<SP>*</SP>=-0.1-10.0; b<SP>*</SP>=-5.0-5.0. The insolation-screening resin base material is obtained by molding the insolation-screening resin material into a planar or cubic shape. The insolation-screening composite material is obtained by laminating the insolation-screening resin base material molded into a planar shape with a glass plate, or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a solar radiation shielding resin base material, a solar radiation shielding composite base material, and the like applied to windows for vehicles, buildings, ordinary houses, and roof materials for arcades, domes, and the like. A solar shading resin material having high transmission performance in the visible light region and exhibiting a blue color tone, a solar shading fine particle dispersion used for manufacturing the solar shading resin material, and solar radiation obtained by using the solar shading resin material The present invention relates to a shielding resin substrate and a solar radiation shielding composite substrate.

  Conventionally, so-called openings such as roofs of various buildings and windows of vehicles are made of a transparent glass plate or resin plate for taking in sunlight. However, the sun rays include ultraviolet rays and infrared rays in addition to visible rays. In particular, near infrared rays of 800 to 2500 nm out of infrared rays are called heat rays, and cause the indoor temperature to rise by entering from the opening. Become.

  Therefore, in recent years, heat ray shielding materials have been studied as window materials for various buildings and vehicles, etc., which sufficiently absorb visible light and shield the heat rays to maintain the brightness while simultaneously suppressing the temperature rise in the room. Proposed. In addition, from the viewpoint of design properties, there is an increasing demand for a heat ray shielding material that exhibits a blue color tone, has a high solar shading function, has a visible light region transmission performance, and also has high weather resistance.

  For example, Patent Document 1 and Patent Document 2 propose a heat ray shielding plate formed by kneading mica coated with titanium oxide as heat ray reflective particles (sunlight shielding fine particles) in a transparent resin such as an acrylic resin or a polycarbonate resin. Has been. However, in this method, it is necessary to add a large amount of heat ray reflective particles in order to improve the heat ray reflectivity. For this reason, when the addition amount of the heat ray reflective particles is increased, the visible light transmittance is lowered. On the contrary, if the addition amount of the heat ray reflective particles is reduced, it is difficult to satisfy both the heat ray shielding property and the visible light transmittance property at the same time. Further, when a large amount of heat ray reflective particles are blended, there is a drawback in strength that the physical properties of the transparent resin as a base material, particularly impact resistance and toughness, are lowered.

  Therefore, Patent Document 3 proposes a heat ray reflective glass in which various metals and metal oxide materials such as nitrides such as TiN and metal oxides are sputtered onto the glass. However, this method requires large-scale equipment and vacuum equipment, and there are problems in productivity, large area, production cost, etc., and in this heat ray reflective glass, light in the visible light region other than near infrared rays is reflected or reflected simultaneously. It has the property of absorbing and has the disadvantage of giving a glimmering appearance like a mirror and detracting from aesthetics. Furthermore, this method often has high film conductivity, and if the film conductivity is high, there is a problem that radio waves from mobile phones, TVs, radios, etc. are reflected to cause radio interference.

  On the other hand, a technique has been developed in which rhenium trioxide is applied as a component exhibiting heat ray reflection characteristics to eliminate adverse effects such as productivity, area increase, and production cost in Patent Document 3. That is, in Patent Document 4, a coating solution for a heat ray reflective film in which a rhenium compound is dissolved in one or more of alcohol, ketone, amine, and water is applied to a substrate, and then heat-treated. A heat ray reflective film containing rhenium trioxide is obtained. However, although this heat ray reflective film is excellent in heat ray reflection characteristics, rhenium trioxide is inferior in stability in the atmosphere, so when this heat ray reflective film is left in the atmosphere for a long time, the heat ray reflective film There was a problem that the transmittance gradually increased.

  In addition, from the viewpoint of design, the application to heat ray shielding materials such as copper phthalocyanine-based blue organic pigments and dioxazine-based blue-violet organic pigments as materials exhibiting a blue color tone has been attempted. In addition, it is not a material having both visible light transmission performance and an organic material, so it has a problem in weather resistance such as fading due to ultraviolet rays.

For this reason, a solar shading resin base material or a solar shading composite base material having a blue color tone from the viewpoint of design properties, a high solar shading function, and having a visible light region transmission performance has not been actually obtained. is the current situation.
JP-A-5-78544 JP-A-2-173060 JP-A-6-345489 JP-A-9-157554

  The present invention has been made paying attention to such problems, and the problem is that the solar radiation shielding resin material has a high solar radiation shielding function, a high transmission performance in the visible light region, and exhibits a blue color tone. Another object of the present invention is to provide a solar shading fine particle dispersion used in the production of the solar shading resin material, a solar shading resin base material and a solar shading composite base material obtained by using the solar shading resin material.

  Accordingly, in order to obtain a solar radiation shielding material having a high solar radiation shielding function, a high transmission performance in the visible light region, and exhibiting a blue color tone, the present inventors have used trioxide having the highest electrical conductivity among compound conductors. Various studies were conducted focusing on rhenium.

  As a result, when rhenium trioxide fine particles having specific conditions obtained by refining rhenium trioxide are uniformly dispersed in the transparent resin component, the transmittance has a maximum in the visible light region, and visible light A strong plasma reflection appears in the near-infrared region close to the region to have a minimum transmittance, and this transmitted color exhibits a beautiful blue color tone, and the rhenium trioxide fine particles are dispersed in the resin component. The fact that it is difficult to expose to the outside, it can be found that it can also provide high weather resistance.

  Further, the surface of the rhenium trioxide fine particles having specific conditions is coated with a compound containing any element selected from the group of Si, Al, Zr, and Ti, thereby providing higher weather resistance. I came to find that it would be possible. The present invention has been completed based on such technical findings.

That is, the invention according to claim 1
Assuming a solar shading resin material containing a resin component and solar shading fine particles dispersed in the resin component,
The sunscreening fine particles dispersed in the resin component have a powder color of L ^* = 20 to 50, a ^* = − 0.1 to 10.0 by diffuse reflected light in the L ^* a ^* b ^* color system. b ^* = − 5.0 to 5.0, composed of rhenium trioxide fine particles having an average particle diameter of 200 nm or less.

The invention according to claim 2
Based on the solar radiation shielding resin material according to the invention of claim 1,
When the transmittance of the diluted liquid in which the rhenium trioxide fine particles are dispersed has a maximum value at a wavelength of 400 to 600 nm, a minimum value at a wavelength of 700 to 1100 nm, and a visible light transmittance of 20% or more and less than 80%. The difference between the maximum value and the minimum value is 30 points or more in percentage,
The invention according to claim 3
Based on the solar radiation shielding resin material according to the invention of claim 1 or 2,
The rhenium trioxide fine particles are coated with a compound containing any element selected from the group of Si, Al, Zr, and Ti,
The invention according to claim 4
Based on the solar radiation shielding resin material according to any one of claims 1 to 3,
The resin component is any one of a polycarbonate resin, an acrylic resin, a fluororesin, a polyester resin, a polyvinyl acetal resin, a polyvinyl butyral resin, and an ethylene-vinyl acetate copolymer resin.

Next, the invention according to claim 5 is:
Assuming a sunscreen resin base material,
The solar radiation shielding resin material according to any one of claims 1 to 4 is formed into a flat or three-dimensional shape,
The invention according to claim 6
Assuming a solar-shielding composite substrate,
Whether the solar radiation shielding resin material according to any one of claims 1 to 4 is composed of a solar radiation shielding resin base material formed into a sheet shape and a pair of plate-like glasses bonded to both surfaces of the solar radiation shielding resin base material. The solar radiation shielding resin material according to claim 1 is formed into a sheet shape, and one or more other resin plates bonded to the solar radiation shielding resin substrate. It is characterized by this.

The invention according to claim 7
Premise of the solar shading fine particle dispersion used for producing the solar shading resin material according to any one of claims 1 to 4,
The main component is an organic solvent and / or a plasticizer, solar shading fine particles comprising the rhenium trioxide fine particles according to any one of claims 1 to 3, and a polymer dispersant that disperses the solar shading fine particles. And, the mixing ratio of the solar shading fine particles and the polymer dispersing agent is 0.3 parts by weight or more and less than 10 parts by weight of the polymer dispersing agent with respect to 1 part by weight of the solar shading fine particles,
The invention according to claim 8 provides:
Premise of the solar shading fine particle dispersion used for producing the solar shading resin material according to any one of claims 1 to 4,
A solar radiation shielding fine particle comprising the rhenium trioxide fine particles according to any one of claims 1 to 3 and a polymer dispersant for dispersing the solar radiation shielding fine particle, and the solar radiation shielding fine particle and the polymer system. The mixing ratio with the dispersant is not less than 0.3 parts by weight and less than 10 parts by weight of the polymer dispersant with respect to 1 part by weight of the solar shading fine particles, and is substantially free of solution components. is there.

According to the solar shading resin material according to the present invention, the solar shading fine particles dispersed in the resin component have a powder color of L ^* = 20 to 50 by diffuse reflection in the L ^* a ^* b ^* color system. ^* = − 0.1 to 10.0, b ^* = − 5.0 to 5.0, and composed of rhenium trioxide fine particles having an average particle diameter of 200 nm or less.

  Therefore, the transmittance of the solar shading resin material has a maximum value at a wavelength of 400 to 600 nm, a minimum value at a wavelength of 700 to 1100 nm, and a maximum value and a minimum value when the visible light transmittance is 20% or more and less than 80%. Since the difference from the value is 30 points or more in percentage, and the blue color tone is exhibited, the window material having a high solar radiation shielding function and a high transmission performance in the visible light region and having a blue color tone, etc. It becomes possible to obtain a solar radiation shielding resin base material or a solar radiation shielding composite base material.

  Furthermore, according to the solar radiation shielding fine particle dispersion according to the present invention, it is possible to easily and inexpensively produce a solar radiation shielding resin material in which rhenium trioxide fine particles are dispersed in a resin component.

  Hereinafter, the present invention will be described in detail.

  First, the solar shading resin material according to the present invention comprises rhenium trioxide fine particles having specific conditions as solar shading fine particles dispersed in a transparent resin component such as polycarbonate, acrylic resin, or polyvinyl butyral resin. Thus, it can be formed into an arbitrary flat or three-dimensional shape such as a plate shape, a film shape, a spherical shape, or the like, according to the application, to obtain a solar radiation shielding resin base material.

This will be specifically described below.
1. Rhenium trioxide The rhenium trioxide used as the solar shading fine particles has an average particle size of 200 nm or less and is in the L ^* a ^* b ^* color system (JIS Z 8729) defined by the International Lighting Commission (CIE). Fine particles whose powder color by diffuse reflected light is L ^* = 20-50, a ^* = − 0.1 to 10.0, b ^* = − 5.0 to 5.0, visible light transparency, solar shading And has a characteristic of vivid blue tone.

  In the state where the particle diameter of the rhenium trioxide fine particles is 200 nm or less and is sufficiently smaller than the visible light wavelength and is uniformly dispersed in the transparent medium, visible light transparency occurs. However, the infrared light shielding property can be kept sufficiently strong. The reason for this has not been elucidated in detail, but the amount of free electrons in the fine particles is large, and the plasma frequency of free electron plasmons inside and on the surface of the particles is just in the vicinity of the visible to near-infrared region. It is thought that heat rays are selectively reflected and absorbed. In other words, the transmittance profile of the solar shading resin material in which the rhenium trioxide fine particles applied in the present invention are sufficiently finely pulverized and uniformly dispersed in the resin component has a maximum transmittance at a wavelength of 400 to 600 nm. In addition, it has a minimum value at a wavelength of 700 to 1100 nm, and when the difference between the maximum value and the minimum value of the transmittance is 20% or more and less than 80%, the percentage is 30 points or more. ing. Considering that the visible light region is 380 to 780 nm and the visibility is a bell-shaped peak having a peak at around 550 nm, having such a transmittance profile effectively transmits visible light, It can be understood that it has an optical characteristic of effectively reflecting and absorbing heat rays.

  The rhenium trioxide fine particles according to the present invention are required to have an average particle size of 200 nm or less. When the average particle diameter exceeds 200 nm, the above-described specific transmittance profile, that is, the transmittance has a maximum value at a wavelength of 400 to 600 nm and a minimum value at a wavelength of 700 to 1100 nm, and the above-mentioned maximum of transmittance. When the difference between the value and the minimum value is 20% or more and less than 80% of the visible light transmittance, a profile with a percentage of 30 points or more cannot be obtained, resulting in a black to gray transmission color with a monotonously reduced transmittance. Tend. Further, when the average particle diameter exceeds 200 nm, the tendency of aggregation between the fine particles becomes strong when dispersed in the resin component, which causes sedimentation of the fine particles. Further, fine particles exceeding 200 nm or aggregated coarse particles serve as a light scattering source and cause clouding (haze) or decrease in visible light transmittance. Therefore, the average particle diameter of the rhenium trioxide fine particles is required to be 200 nm or less. In this case, even if the average particle size in the fine particle raw material stage is large, there is no particular problem in using it as solar shielding fine particles if a pulverization step can be introduced to finally reduce it to 200 nm or less.

Also, the powder color by diffuse reflection in the L ^* a ^* b ^* color system is L ^* = 20 to 50, a ^* = − 0.1 to 10.0, b ^* = − 5.0 to 5.0. In the case of rhenium trioxide fine particles outside the above range, the desired solar shading characteristics cannot be obtained due to the state of the raw material rhenium compound, the production conditions of rhenium trioxide, etc. It has also been confirmed by experiments by the present inventors that a bright blue color does not appear. The surface of the rhenium trioxide fine particles is preferably not oxidized, but usually it is often slightly oxidized, and surface oxidation is inevitable to some extent during the fine particle dispersion step. However, even in that case, if the above-mentioned powder color condition is satisfied, the effectiveness of exhibiting the solar radiation shielding effect remains unchanged.
2. Production method of rhenium trioxide fine particles Rhenium trioxide fine particles are obtained by heating metallic rhenium in an oxygen atmosphere, obtaining dirhenium heptoxide by CO or dioxane, or reducing perrhenic acid with alcohol. Thus, it can be manufactured by various methods such as a method to be obtained. Although rhenium trioxide prepared by any method can be used, when the heating temperature at the time of preparation is 400 ° C. or higher, ReO ₃ once generated tends to peroxidize, and the desired solar shading characteristics cannot be obtained. There is a case. In addition, the primary particle size of the produced ReO ₃ may become coarse, requiring a long time refinement process. On the contrary, when the heating temperature is 120 ° C. or lower, unreacted perrhenic acid or alcohol remains in addition to rhenium trioxide, which may cause deterioration of the solar radiation shielding resin substrate itself.

Next, surface treatment of the rhenium trioxide fine particles is preferable because it can improve the weather resistance of the fine particles and can be easily and uniformly introduced into the resin component. Rhenium trioxide lacks stability in the air, and has a tendency to gradually change to HReO ₄ by reacting with moisture in the air. In the solar shading resin material according to the present invention, the rhenium trioxide fine particles are uniformly dispersed in the resin component, so that it is difficult for the rhenium trioxide fine particles and the air to come into direct contact during use (that is, the rhenium trioxide fine particles). The present inventors have confirmed that the decomposition reaction of rhenium trioxide hardly occurs in practice. However, the weather resistance can be further improved by coating the surface of the rhenium trioxide fine particles with a compound containing any element selected from the group consisting of Si, Al, Zr and Ti. The surface treatment method is not particularly limited. For example, in the step of pulverizing the fine particles, a usual organic solvent is used together with an alkoxide based on Si, Al, Zr, Ti, a coupling agent, a surfactant, and the like. Uniformly coat the surface of fine particles with compounds containing Si, Al, Zr, and Ti by performing pulverization and, if necessary, hydrolysis, polycondensation, and sintering. Can do. The method in the pulverization step is not particularly limited, and methods such as a ball mill, a sand mill, ultrasonic dispersion, and a bead mill can be used. At this time, various dispersants may be added as necessary. By performing these surface coating treatments, the surface state of the rhenium trioxide fine particles becomes more stable, and the weather resistance is improved as compared with the untreated rhenium trioxide fine particles.
3. Sunlight shielding fine particle dispersion Rhenium trioxide fine particles having the above-mentioned conditions prepared by such a method, or rhenium trioxide fine particles subjected to further surface treatment, are dispersed in a resin component and the solar radiation described below. The shielding resin material is configured. When this solar radiation shielding resin material is produced, a solar radiation shielding fine particle dispersion is applied. That is, a liquid mainly composed of an organic solvent and / or a plasticizer, rhenium trioxide fine particles having the above-described conditions, or further rhenium trioxide fine particles subjected to surface coating treatment, and a polymer dispersant. The rhenium trioxide fine particles are contained in the resin component using a fine particle dispersion for solar shading or a powdery solar shading fine particle dispersion obtained by heating and removing a solution component such as an organic solvent or a plasticizer. It is possible to produce a solar shading resin material dispersed in the material. In addition, the powdery solar shading fine particle dispersion obtained by heating and removing solution components such as organic solvents and plasticizers by a known method is a special device when introduced into organic solvents, plasticizers and resins. In addition, fine particles can be uniformly dispersed by simple stirring without the need for or treatment. At this time, if the polymer dispersant is less than 0.3 part by weight with respect to 1 part by weight of the solar shading fine particles, aggregation or the like may occur when it is introduced into the organic solvent, plasticizer or resin. This causes haze in the material. On the other hand, if the amount is 10 parts by weight or more, the polymer dispersant in the solar shading resin material becomes excessive, which may adversely affect the weather resistance of the solar shading resin material. Therefore, it is desirable that the mixing ratio of the solar shielding fine particles and the polymer dispersant is 0.3 part by weight or more and less than 10 parts by weight of the polymer dispersant with respect to 1 part by weight of the solar radiation shielding particles.

In addition, the above-mentioned sunscreen fine particle dispersion is not only in the form of a powder obtained by heating and removing solution components such as an organic solvent and a plasticizer by a known method, but also in an organic material added in the pulverization and surface treatment steps as described above It may be a liquid that does not remove a solution component such as a solvent, or may be dispersed in a raw material or a plasticizer corresponding to the resin used for the solar shading resin material. The organic solvent and plasticizer used here are not particularly limited, and can be selected according to the conditions for forming the resin to be blended, and general organic solvents and plasticizers can be used. Moreover, you may adjust pH by adding an acid and an alkali as needed. Examples of the polymer dispersant include polyacrylate dispersants, polyurethane dispersants, polyether dispersants, polyester dispersants, polyester urethane dispersants, and the like. Product names: SN thickener A-850, SN thickener A-815, product names EFKA ADDITIVES BV manufactured by SAN NOPKO Co., Ltd. EFKA4500, EFKA4530, BYK-Chemie The product name Disperbyk-116 manufactured by the company is exemplified, and as the polyurethane dispersant, the product names EFKA4046, EFKA4047, EFKA4520, the product names Cognis manufactured by Efka Additives TEXAPHOR P60, TEXAPHOR P63, TEXAPHOR P610 and the like are exemplified, and the trade names SN thickener A-801, SN thickener A-802, SN thickener A-80 manufactured by San Nopco Co., Ltd. 3, SN thickener A-804, SN thickener A-806, trade names manufactured by Enomoto Kasei Co., Ltd. DISPARLON DA234, DISPARLON DA325, etc. are exemplified, and polyester dispersants are trade names manufactured by Avecia, Solsperse 22000, Solsperse 24000SC, Solsperse24000GR, Solsperse26000, Solsperse27000, Solsperse28000, Solsperse36000, Solsperse36600, Solsperse38500, trade names manufactured by Enomoto Kasei Co., Ltd. DISPARLON DA70350, DISPARLON DA705, DISPARLON DA725, DISPARLON DA860, DISPARLON DA873N, etc. In addition, the state of the polymer dispersant at normal temperature can be used in any of liquid, solid, and gel.
4). In order to produce a solar shading resin material using the above-described liquid or powdery solar shading fine particle dispersion, the solar shading fine particles are contained in the resin used for the solar shading resin material. Any method can be used as long as it can be uniformly dispersed. Use a method of uniformly melting and mixing with a kneader such as a general ribbon blender, tumbler, nauter mixer, Henschel mixer, etc., and a Banbury mixer, kneader, roll, single screw extruder, twin screw extruder, etc. Is also possible.

  For example, when the resin used for the solar shading resin material is a polycarbonate resin, a powdery solar shading fine particle dispersion is added to a dihydric phenol used as a raw material of the resin, melted and mixed, and carbonate exemplified by phosgene By reacting with the precursor, a mixture (sunlight shielding resin material) in which fine particles are uniformly dispersed in the resin can be prepared. Further, when the resin used for the solar shading resin material is an acrylic resin, a liquid solar shading fine particle dispersion is added to methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate or the like that is a raw material of the acrylic resin, and a known method The mixture (sunlight shielding resin material) in which the fine particles are uniformly dispersed in the acrylic resin can be prepared by mixing the mixture uniformly and by a known method such as suspension polymerization or soul polymerization. Further, when the resin used for the solar shading resin material is a polyvinyl butyral resin, the powdery solar shading fine particle dispersion may be triethylene glycol di-2 ethyl butyrate (3GH) or triethylene glycol di-2 ethyl hexa A mixture (sunlight shielding resin material) in which fine particles are uniformly dispersed in a resin is prepared by mixing with a general plasticizer such as noate (3GO) with stirring and mixing with a polyvinyl butyral resin by a known method. can do.

The mixture (sunlight shielding resin material) thus obtained is formed into a flat shape or a curved shape (that is, a flat or three-dimensional shape) by a known molding method such as injection molding, extrusion molding, compression molding, etc. A shielding resin base material can be manufactured. Also, a mixture (sunlight shielding resin material) in which fine particles for solar shading are uniformly dispersed in the resin is once pelletized by a granulator, and the pellet is added and mixed in the resin, and the solar shading is performed by the same molding method as above. A resin base material can also be manufactured. In addition, the thickness of a solar radiation shielding resin base material can be adjusted to arbitrary thickness from a plate shape to a thin film shape as needed.
5). Next, the solar-shielding composite base material formed into a sheet shape can be used as a solar-shielding composite base material by laminating it with two plate glasses or one or more other resin plates. . For example, a polycarbonate resin base material and a glass plate formed into a sheet shape are bonded together using an adhesive and used as a solar radiation shielding composite base material, or a polyvinyl butyral resin base material formed into a sheet shape is used as an intermediate film And this can be used as a solar radiation shielding composite base material sandwiched between two glass plates and pressure-bonded by an autoclave.

  A heat ray shielding film or an ultraviolet absorbing film may be further formed on the surfaces of the solar radiation shielding resin base material and the solar radiation shielding composite base material. For example, it is possible to apply a coating solution in which ITO fine particles or ATO fine particles are dispersed in various binders on a solar radiation shielding resin substrate, and further form a heat ray shielding film on the surface. In addition, an ultraviolet absorbing film can be formed by applying a coating solution prepared by dissolving a benzotriazole-based or benzophenone-based ultraviolet absorber in various binders on the solar radiation shielding resin substrate and curing it. By forming this ultraviolet absorbing film, it is possible to further improve the weather resistance of the resin substrate.

  The resin material for the solar shading resin base material is not particularly limited as long as it is a transparent, colorless, transparent and colorless resin. Polycarbonate resin, acrylic resin, fluororesin, polyester resin, polyvinyl acetal resin, polyvinyl butyral In addition to resins and ethylene-vinyl acetate copolymer resins, polyolefin resins, vinyl chloride resins, vinyl fluoride resins, and the like can be used as appropriate.

  The polycarbonate resin is obtained by reacting a dihydric phenol with a carbonate precursor by a solution method or a melting method. Examples of the dihydric phenol include 2,2-bis (4-hydroxyphenyl) propane [bisphenol A], 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, , 2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3-methyl) Representative examples include phenyl) propane, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone, and the like. Further, a preferred dihydric phenol is a bis (4-hydroxyphenyl) alkane series, and those having bisphenol A as a main component are particularly preferred.

  As acrylic resins, methyl methacrylate, ethyl methacrylate, propyl methacrylate, and butyl methacrylate are used as main raw materials, and acrylic acid esters having 1 to 8 carbon atoms, vinyl acetate, styrene, acrylonitrile, methacryloyl as necessary. A polymer or copolymer using nitrile or the like as a copolymerization component is used. Furthermore, an acrylic resin polymerized in multiple stages can also be used.

  Further, as the fluororesin, any resin containing fluorine in the molecular structure may be used, and examples thereof include tetrafluoroethylene resin, trifluoride ethylene resin, difluoroethylene resin, monofluoroethylene resin, and the like. A mixture thereof may be used.

  As the polyester resin, a linear saturated polyester resin obtained by polycondensation of an acid component and a diol component, specifically, polyethylene terephthalate, polyethylene naphthalate, or the like can be used as appropriate. Here, the acid component may be one or more of saturated dibasic acids such as phthalic acid, phthalic anhydride, sebacic acid and azelaic acid, and dimer acid, and the diol component may be ethylene glycol, propylene glycol, decane. One kind or two or more kinds such as diol, dodecanediol, hexadecanediol, bisphenol compound and ethylene oxide or propylene oxide adduct thereof can be used.

  The polyvinyl acetal resin is particularly preferably a polyvinyl butyral resin obtained by acetalizing polyvinyl alcohol with an aldehyde having about 4 to 8 carbon atoms when used as an adhesive resin constituting a laminated glass sandwiched between two plate glasses. . The degree of butyralization of this polyvinyl butyral resin is not particularly limited, but about 60 to 75% is particularly preferable from the viewpoint of transparency and adhesion.

  The ethylene-vinyl acetate copolymer-based resin is not particularly limited as long as it is an ethylene-vinyl acetate random copolymer containing ethylene as a main component, and the content of vinyl acetate units is preferably about 10 to 45% by weight. .

  In this way, rhenium trioxide fine particles having the above-mentioned characteristics are used as solar shielding fine particles, and uniformly dispersed in the resin component and molded into an appropriate shape, thereby enabling a high-cost physical film forming method and a complicated bonding process. Without using it, it is possible to provide a solar radiation shielding resin base material or a solar radiation shielding composite base material that has a solar radiation shielding function and has high transparency in the visible light range and exhibits a blue color tone.

  In addition, the rhenium trioxide fine particles described above have a high hiding power as compared with general organic blue pigments and can exhibit an effect when added in a small amount, so that the material cost can be reduced.

  Hereinafter, the present invention will be described specifically by way of examples. However, the present invention is not limited to the following examples. The visible light transmittance VLT (wavelength 380 to 780 nm), transmission profile, and powder color (standard light source D65, 10 ° field of view) of the diffuse reflected light of the obtained sample are spectrophotometer U manufactured by Hitachi, Ltd. -4000.

  The VLT was calculated according to JIS R3106, and the powder color was calculated according to JIS Z8729. Moreover, the powder color by diffuse reflected light was measured using a powder cell for Hitachi U4000 type spectrophotometer (Part No. 139-0647, 22 mm diameter × 10 mm thickness).

  Furthermore, haze (Haze) was measured using HR-200 manufactured by Murakami Color Co., Ltd. In addition, in the weather resistance test, the produced solar shading resin base material or solar shading composite base material was placed in a sunshine weatherometer (Ci4000 manufactured by ATLAS) operating according to the test cycle of ISO 4892-2 for 500 hours. Evaluation was made by measuring the difference in visible light transmittance (ΔVLT).

  A perrhenic acid aqueous solution (containing 55% by weight in terms of rhenium trioxide) and methanol were mixed in a ratio of 40% by weight for the former and 60% by weight for the latter, and this solution was heated at 150 ° C. in a nitrogen atmosphere. Stir. During the heating, 3 times the amount of methanol at the start was gradually added, and the sample obtained after the liquid component finally disappeared was washed with water and dried to prepare fine particles.

When the fine particles (A powder) thus obtained were identified by XRD measurement, it was confirmed to be rhenium trioxide, and diffraction peaks of other substances were not confirmed. The powder color of the A powder by diffuse reflected light was L ^* = 34.5, a ^* = 4.2, and b ^* = − 1.2.

  200 g of the rhenium trioxide fine particles (A powder), 700 g of triethylene glycol di-2 ethyl butyrate (3 GH), and 60 g of a polymer dispersing agent are mixed and ball mill mixed for 100 hours using a zirconia ball having a diameter of 5 mm. The dispersion process was performed. The average particle diameter of the rhenium trioxide fine particles in the obtained dispersion (sunlight shielding fine particle dispersion) was 90 nm.

Further, a part of this dispersion (sunlight shielding fine particle dispersion) is diluted with ethanol so that the ReO ₃ concentration becomes 0.01% by weight, and this diluted liquid is put in a 10 mm square cell made of PYREX (registered trademark). The transmission profile was measured. As a result, the maximum value of transmittance was 72.0% at a wavelength of 445 nm, the minimum value was 21.8% at a wavelength of 830 nm, and the difference between the transmittances of the maximum value and the minimum value was 50.2%. The VLT of the diluted solution at the time of measurement was 55.0%.

Next, the dispersion (sunlight shielding fine particle dispersion) was mixed with polyvinyl butyral resin so that the ReO ₃ concentration was 0.1% by weight, and kneaded and mixed at about 70 ° C. with a three-roll mixer. The obtained resin (sunlight shielding resin material) was extruded to a thickness of 0.8 mm using a mold extruder to obtain a sheet-like resin (sunlight shielding resin substrate).

  Next, two pieces of blue plate glass having a size of about 300 × 300 mm and a thickness of about 2.1 mm are prepared, and after cutting the sheet-like resin (sunlight shielding resin base material) into the same size as this blue plate glass, 2 A laminated body was obtained by sandwiching between blue sheets of glass.

Next, this laminate is put into a rubber vacuum bag, the inside of the bag is decompressed and held at about 100 ° C. for 30 minutes, then cooled to room temperature, and the laminate taken out of the bag is put into an autoclave apparatus, and the pressure is about 12 kg / A laminated glass substrate was prepared by applying pressure and heating at cm ² and a temperature of about 120 ° C. for 30 minutes to perform a vitrification treatment.

  The transmission profile of the obtained sample (sunlight shielding composite substrate) is shown in FIG.

  The maximum transmittance is 65.1% at a wavelength of 445 nm, the minimum is 12.2% at a wavelength of 825 nm, the transmittance is high in the visible light region, and the transmittance has a minimum value in the near infrared region. It is confirmed that it has excellent solar shading characteristics.

  Further, the transmitted color of this sample (sunlight shielding composite base material) was a beautiful blue color.

  Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding composite substrate).

In the rhenium trioxide preparation step in Example 1, rhenium trioxide fine particles (B powder) were obtained in the same manner as in Example 1 except that the heating temperature at the time of preparation was 300 ° C. The powder color of the B powder by diffuse reflection was L ^* = 34.9, a ^* = 5.2, and b ^* = − 2.1.

Next, 200 g of the above-mentioned rhenium trioxide fine particles (B powder) and 700 g of isopropyl alcohol were mixed, and ball mill mixing was performed for 100 hours using a zirconia ball having a diameter of 5 mm for dispersion treatment. The average particle diameter of the rhenium trioxide fine particles in this dispersion was 120 nm. In addition, a part of this dispersion was diluted with ethanol so that the ReO ₃ concentration was 0.01% by weight, and a transmission profile of this diluted solution placed in a 10 mm square cell made of PYREX (registered trademark) was measured. As a result, the maximum value of transmittance was 75.0% at a wavelength of 480 nm, the minimum value was 16.5% at a wavelength of 920 nm, and the difference between the transmittances of the maximum value and the minimum value was 58.5%. The VLT of the diluted solution at the time of measurement was 56.2%.

  Next, 1 kg of tetramethoxysilane was added to the dispersion and stirred, and 700 g of distilled water was gradually added dropwise, followed by stirring for 24 hours to perform a Si compound coating treatment. And the solvent of this liquid was completely evaporated using the vacuum dryer, the rhenium trioxide powder (coating B powder) coat | covered with Si compound was obtained by heating the obtained powder at 300 degreeC.

  100 g of this powder (coating B powder), 400 g of triethylene glycol di-2 ethyl butyrate (3GH), and 30 g of a polymer dispersing agent are mixed and dispersed by ball milling for 50 hours using zirconia balls having a diameter of 10 mm. The treatment was carried out to obtain a liquid solar shading fine particle dispersion.

  And it carried out similarly to Example 1 except the point which used the said fine particle dispersion for solar radiation shielding to which coating | coated B powder was applied, and produced the solar radiation shielding composite base material which concerns on Example 2. FIG.

  The transmission profile of the obtained sample (sunlight shielding composite substrate) is shown in FIG.

  The maximum transmittance is 72% at a wavelength of 480 nm, the minimum is 11.2% at a wavelength of 920 nm, the transmittance is high in the visible light region, and the transmittance has a minimum value in the near infrared region. It is confirmed that the solar shading characteristics are excellent.

  Further, the transmitted color of this sample (sunlight shielding composite base material) was a beautiful blue color.

  Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding composite substrate).

Except for using Reo ₃ powder made by Toshima Seisakusho as rhenium trioxide powder, Si coating treatment was performed in the same manner as in Example 2, and a solar radiation shielding composite substrate was prepared in the same manner as in Example 2. .

The powder colors of ReO ₃ powder manufactured by Toshima Seisakusho using diffuse reflected light were L ^* = 37.2, a ^* = 6.2, and b ^* = − 1.1. The average particle size of ReO ₃ powder manufactured by Toshima Seisakusho dispersed in isopropyl alcohol was 160 nm. A part of the dispersion was diluted with ethanol so that the ReO ₃ concentration was 0.01% by weight, and the transmission profile of this diluted solution placed in a 10 mm square cell made of PYREX (registered trademark) was measured. As a result, the maximum value of the transmittance was 73.2% at a wavelength of 445 nm, the minimum value was 36.2% at a wavelength of 830 nm, and the difference between the transmittances of the maximum value and the minimum value was 37.0%. Further, the VLT of the diluted solution at the time of measurement was 55.7%.

  The transmission profile of the obtained sample (sunlight shielding composite substrate) is shown in FIG.

  The maximum transmittance is 69% at a wavelength of 455 nm and the minimum is 32% at a wavelength of 835 nm. The transmittance is high in the visible light region and has a minimum transmittance value in the near infrared region. It is confirmed that the shielding properties are excellent.

  Further, the transmitted color of this sample (sunlight shielding composite base material) was a beautiful blue color.

  Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding composite substrate).

Using the coated B powder obtained in Example 2, the polymeric dispersant was added so that the ratio of the polymeric dispersant was 3 parts by weight with respect to 1 part by weight of the coated B powder (ReO ₃ ). Further, an appropriate amount of toluene was added and mixed with stirring.

  Next, toluene in this dispersion was evaporated using a vacuum dryer to obtain a powdery solar shading fine particle dispersion.

This powdery solar shading fine particle dispersion is added to a polycarbonate resin so that the ReO ₃ concentration is 0.03% by weight, and is uniformly melt-mixed with a blender and a twin screw extruder, and then used with a T die. Extrusion-molded to a thickness of 3 mm to produce a sheet-like solar-shielding polycarbonate (solar-shielding resin substrate) in which the solar-shielding fine particles were uniformly dispersed throughout.

  The transmission profile of the obtained sample (sunlight shielding resin substrate) has a maximum transmittance of 63% at a wavelength of 480 nm, a minimum of 10% at a wavelength of 915 nm, a high transmittance in the visible light region, and a near infrared region. It is confirmed that the profile has a minimum value of transmittance and is excellent in solar shading characteristics.

  Further, the transmitted color of this sample (sunlight shielding resin base material) was a beautiful blue color.

  Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding resin base material).

200 g of ReO ₃ powder manufactured by Toyoshima Seisakusho and 700 g of isopropyl alcohol were mixed, and dispersion treatment was performed by ball mill mixing for 100 hours using zirconia balls having a diameter of 5 mm. The average particle size of the ReO ₃ powder in this dispersion was 160 nm.

  To this dispersion, 500 g of titanium isopropoxide was added and stirred, and then 400 g of distilled water was gradually added dropwise and stirred for 24 hours to coat the Ti compound. Next, the solvent of this liquid was completely evaporated using a vacuum dryer, and the resulting powder was heated at 250 ° C. to obtain rhenium trioxide powder (coated C powder) coated with a Ti compound.

  And it carried out similarly to Example 4 except having replaced with the coating B powder of Example 4, and having applied the coating C powder, and the sheet-like solar radiation shielding polycarbonate (sunlight shielding resin) which the coating C powder uniformly disperse | distributed to the whole Substrate).

  The transmission profile of the obtained sample (sunlight shielding resin base material) has a maximum transmittance of 61% at a wavelength of 465 nm and a minimum of a wavelength of 855 nm at 29%. The transmittance is high in the visible light region and transmitted in the near infrared region. It is confirmed that the profile has a minimum value of the rate and is excellent in solar shading characteristics.

  Further, the transmitted color of this sample (sunlight shielding resin base material) was a beautiful blue color.

  Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding resin base material).

  Using the coated B powder obtained in Example 2, 200 g of the coated B powder, 700 g of ethylene glycol, and 60 g of a polymer dispersant were mixed, and the mixture was liquid-mixed by ball milling for 50 hours using zirconia balls having a diameter of 10 mm. A fine particle dispersion for solar radiation shielding was obtained.

  Next, this liquid solar shading fine particle dispersion is diluted with ethylene glycol so that the rhenium trioxide concentration is 2.0% by weight. The diluted solution and terephthalic acid are 30% by weight for the former and the latter for After mixing at a ratio of 70% by weight, esterification and polycondensation reaction were carried out in a high-temperature vacuum mixing tank to produce a solar radiation shielding polyethylene terephthalate resin (a solar radiation shielding resin material).

  Next, this resin (sunlight shielding resin material) is uniformly melt-mixed by a blender and a twin-screw extruder, and then extruded using a T-die to a thickness of 50 μm, and the sunscreening powder is uniformly dispersed throughout the sheet. -Shaped solar radiation shielding polyethylene terephthalate (a solar radiation shielding resin base material) was produced.

  The transmission profile of the obtained sample (sunlight shielding resin substrate) is shown in FIG.

  The maximum transmittance is 63% at a wavelength of 480 nm, the minimum is 10% at a wavelength of 920 nm, the transmittance is high in the visible light region, and the profile has the minimum transmittance in the near infrared region. It is confirmed that the shielding properties are excellent.

  Further, the transmitted color of this sample (sunlight shielding resin base material) was a beautiful blue color.

Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding resin base material).
(Comparative Example 1)
In the rhenium trioxide preparation step in Example 1, rhenium trioxide fine particles (D powder) were obtained in the same manner as in Example 1 except that the heating temperature at the time of preparation was 400 ° C.

The powder colors of the powder (D powder) by diffuse reflected light are L ^* = 51.2, a ^* = − 1.2, b ^* = − 2.1, “L ^* = 20 to 50, a ^*. = −0.1 to 10.0 ”was not satisfied.

Next, 200 g of D powder and 700 g of isopropyl alcohol were mixed, and dispersion treatment was performed by ball mill mixing for 100 hours using zirconia balls having a diameter of 5 mm. In addition, the average particle diameter of D powder in the obtained dispersion was 225 nm which does not satisfy the condition of “200 nm or less”. In addition, a part of this dispersion was diluted with ethanol so that the ReO ₃ concentration was 0.01% by weight, and a transmission profile of this diluted solution placed in a 10 mm square cell made of PYREX (registered trademark) was measured. As a result, the maximum value of transmittance was 75.2% at a wavelength of 480 nm, the minimum value was 59.9% at a wavelength of 860 nm, and the difference between the transmittances of the maximum value and the minimum value was 15.3%. The VLT of the diluted solution at the time of measurement was 56.0%.

  Next, a polymer dispersant is added so that the proportion of the polymer dispersant is 3 parts by weight with respect to 1 part by weight of the D powder, and after stirring and mixing, the isopropyl alcohol in the dispersion is vacuumed. Evaporation was carried out using a dry dryer to obtain a powdery fine particle dispersion for solar shading.

This powdery solar shading fine particle dispersion is directly added to the polycarbonate resin so that the ReO ₃ concentration is 0.03% by weight, and is uniformly melt-mixed by a blender and a twin screw extruder, and then a T die is used. The sheet was extruded to a thickness of 3 mm to produce a sheet-like solar shading polycarbonate (sun solar shading resin base material) in which ReO ₃ was dispersed.

  The transmission profile of the obtained sample (sunlight shielding resin substrate) is shown in FIG.

  The maximum value of the transmittance is 70%, the minimum value is 54%, and a comparatively gentle profile with a small difference between the maximum value and the minimum value is obtained. It was confirmed that it was not obtained.

  Further, the transmitted color of this sample (sunlight shielding resin base material) was not blue but bluish gray, and the sunscreening fine particles in the resin were dispersed in a non-uniform state, resulting in a high haze value.

Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding resin base material).
(Comparative Example 2)
200 g of D powder obtained in Comparative Example 1 and 700 g of isobutyl alcohol are stirred and mixed, 1 kg of tetramethoxysilane is added and stirred, 700 g of distilled water is gradually added dropwise, and stirring is performed for 24 hours. The coating process was performed. And the solvent of this liquid was completely evaporated using the vacuum dryer, the rhenium trioxide powder (coating D powder) coat | covered with Si compound was obtained by heating the obtained powder at 300 degreeC.

  100 g of this powder (coating D powder), 400 g of triethylene glycol di-2 ethyl butyrate (3GH), and 30 g of a polymeric dispersant are mixed and dispersed by ball mill mixing for 50 hours using zirconia balls having a diameter of 10 mm. The treatment was carried out to obtain a liquid solar shading fine particle dispersion.

  And it carried out similarly to Example 1 except the point using the said fine particle dispersion for solar radiation shielding to which coating | coated D powder was applied, and the solar radiation shielding composite base material which concerns on the comparative example 2 was produced.

  The transmission profile of the obtained sample (sunlight shielding composite substrate) is shown in FIG.

  The maximum value of transmittance is 80%, the minimum value is 60%, and a comparatively gentle profile with a small difference between the maximum value and the minimum value is obtained. It was confirmed that it was not obtained.

Further, the transmitted color of this sample (sunlight shielding composite base material) was not blue but bluish gray, and the sunscreening fine particles in the resin were dispersed in a non-uniform state, resulting in a high haze value.
It was a beautiful blue color.

Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding composite substrate).
(Comparative Example 3)
Instead of rhenium trioxide, a copper phthalocyanine-based blue organic pigment ("5203" manufactured by Dainichi Seika) was used, 100g of this pigment powder, 400g of triethylene glycol di-2ethylbutyrate (3GH), and a polymer dispersion 30 g of the agent was mixed, and dispersion treatment was performed by ball mill mixing for 50 hours using zirconia balls having a diameter of 10 mm. The average particle diameter of the pigment powder in this dispersion was 150 nm.

  Using this dispersion, a sunscreen composite substrate was prepared in the same manner as in Example 1 except that the pigment concentration was 0.04% by weight.

  The transmission profile of the obtained sample (sunlight shielding composite substrate) is shown in FIG.

  The maximum value of the transmittance was 87.13% at a wavelength of 470 nm and the minimum value was 5.27% at a wavelength of 610 nm. There was a sufficient difference between the transmittances of the maximum value and the minimum value, but the minimum value of the transmission profile. Is in the visible light region, and it is confirmed that the transmittance sharply increases from 780 nm in the near infrared region. That is, the solar radiation-shielding composite base material having sufficient visible light transmittance of 55.8% with respect to the visible light transmittance of 31.53% of the obtained sample (sunlight-shielding composite base material) is obtained. It was confirmed that it was not possible.

  In addition, the transmission color of this sample (sunlight shielding composite base material) was blue.

Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding composite substrate).
(Comparative Example 4)
A dioxazine-based blue-violet organic pigment ("ECV5002" manufactured by Dainichi Seika Co., Ltd.) is used in place of rhenium trioxide, and 200 g of this pigment powder, 700 g of toluene, and 60 g of a polymeric dispersant are mixed to form a zirconia ball having a diameter of 5 mm. Was mixed by ball milling for 50 hours for dispersion treatment. The average particle diameter of the pigment powder in this dispersion was 110 nm.

  The polymer dispersant was further added and stirred and mixed so that the polymer dispersant was 3 parts by weight with respect to 1 part by weight of the pigment powder in the dispersion.

  Next, toluene in the obtained dispersion was evaporated using a vacuum dryer to obtain a powdery solar shielding fine particle dispersion.

  This powdery solar shading fine particle dispersion is added to a polycarbonate resin so that the pigment concentration becomes 0.01% by weight, and is uniformly melt-mixed by a blender and a twin screw extruder, and then thickened using a T-die. The sheet was extruded to a thickness of 3 mm, and a sheet-like solar-shielding polycarbonate (solar-shielding resin substrate) in which pigment powder was uniformly dispersed throughout was produced.

  The transmission profile of the obtained sample (sunlight shielding resin substrate) is shown in FIG.

  The maximum value of the transmittance was 71.47% at a wavelength of 440 nm and the minimum value was 7.26% at a wavelength of 535 nm. There was a sufficient difference between the transmittances of the maximum value and the minimum value, but the minimum value of the transmission profile. Is in the visible light region, and is confirmed to be a profile in which the transmittance suddenly increases from around 650 nm. That is, the solar radiation shielding resin base material having sufficient visible light transmittance of 61.09% to the visible light transmittance of 17.12% of the obtained sample (sunlight shielding resin base material) is obtained. It was confirmed that it was not possible.

  In addition, the transmission color of this sample (sunlight shielding resin base material) was bluish purple.

  Table 1 below shows the visible light transmittance, solar transmittance, haze, weather resistance test result (ΔVLT), and color tone of this sample (sunlight shielding resin base material).

「評 価」
１．表１に示されたデータから明らかなように各実施例に係る試料においては日射遮蔽機能が高く、可視光領域の高い透過性能を有し、しかも青色の色調を備えていることが確認される。
２．他方、比較例１〜２に係る試料においてはその全てが青色の色調を備えておらず、かつ、日射遮蔽機能とヘイズについて劣っていることが確認される。また、比較例３〜４に係る試料においては青色の色調を備えているが、可視光領域の透過性能が極端に劣っていることが確認される。

"Evaluation"
1. As is clear from the data shown in Table 1, it is confirmed that the samples according to each Example have a high solar shading function, a high transmission performance in the visible light region, and a blue color tone. .
2. On the other hand, it is confirmed that all of the samples according to Comparative Examples 1 and 2 do not have a blue color tone and are inferior in the solar radiation shielding function and haze. Moreover, although the sample which concerns on Comparative Examples 3-4 is equipped with the blue color tone, it is confirmed that the permeation | transmission performance of visible region is extremely inferior.

The graph which shows the permeation | transmission profile of the sample concerning an Example and a comparative example.

Claims (8)

In the solar radiation shielding resin material containing the resin component and the solar radiation shielding fine particles dispersed in the resin component,
The sunscreening fine particles dispersed in the resin component have a powder color of L ^* = 20 to 50, a ^* = − 0.1 to 10.0 by diffuse reflected light in the L ^* a ^* b ^* color system. b ^* = − 5.0 to 5.0, a solar shading resin material comprising rhenium trioxide fine particles having an average particle diameter of 200 nm or less.   When the transmittance of the diluted liquid in which the rhenium trioxide fine particles are dispersed has a maximum value at a wavelength of 400 to 600 nm, a minimum value at a wavelength of 700 to 1100 nm, and a visible light transmittance of 20% or more and less than 80%. The solar radiation shielding resin material according to claim 1, wherein the difference between the maximum value and the minimum value is 30 points or more in percentage.   The solar radiation shielding resin material according to claim 1 or 2, wherein the rhenium trioxide fine particles are coated with a compound containing any element selected from the group consisting of Si, Al, Zr, and Ti.   The resin component is any one of polycarbonate resin, acrylic resin, fluororesin, polyester resin, polyvinyl acetal resin, polyvinyl butyral resin, and ethylene-vinyl acetate copolymer resin. The solar shading resin material according to the above.   A solar radiation-shielding resin base material formed by molding the solar radiation-shielding resin material according to any one of claims 1 to 4 into a flat or three-dimensional shape.   Whether the solar radiation shielding resin material according to any one of claims 1 to 4 is composed of a solar radiation shielding resin base material formed into a sheet shape and a pair of plate glasses bonded to both surfaces of the solar radiation shielding resin base material. The solar radiation shielding resin material according to any one of claims 1 to 4 is formed into a sheet shape and one or more other resin plates bonded to the solar radiation shielding resin substrate. A solar-shielding composite substrate characterized by that. In the solar radiation shielding fine particle dispersion used for producing the solar radiation shielding resin material according to any one of claims 1 to 4,
The main component is an organic solvent and / or a plasticizer, solar shading fine particles comprising the rhenium trioxide fine particles according to any one of claims 1 to 3, and a polymer dispersant that disperses the solar shading fine particles. In addition, the mixing ratio of the solar shielding fine particles and the polymer dispersant is not less than 0.3 parts by weight and less than 10 parts by weight of the polymer dispersant with respect to 1 part by weight of the solar shielding fine particles. Fine particle dispersion for shielding. In the solar radiation shielding fine particle dispersion used for producing the solar radiation shielding resin material according to any one of claims 1 to 4,
A solar radiation shielding fine particle comprising the rhenium trioxide fine particles according to any one of claims 1 to 3 and a polymer dispersant for dispersing the solar radiation shielding fine particle, and the solar radiation shielding fine particle and the polymer system. Solar radiation shielding, characterized in that the mixing ratio with the dispersing agent is not less than 0.3 parts by weight and less than 10 parts by weight of the polymeric dispersant with respect to 1 part by weight of the solar radiation shielding fine particles and does not substantially contain a solution component. Fine particle dispersion.

Images