JP2555860C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shielding plate, and more particularly to a heat-shielding plate which has good transparency, is relatively inexpensive, and has good workability.
It relates to a good heat shield, which can be used in tennis courts and pools.
As roofing or wall materials, or as windows for arcades, domes, buildings or vehicles
As a so-called glazing material, it is widely used in various forms such as plate, sheet, and film.
Can be used effectively. 2. Description of the Related Art In recent years, in fields such as window materials of various buildings and vehicles, visible light has been sufficiently introduced.
To block the heat rays, that is, to suppress the temperature rise in the room while maintaining the brightness.
The demand for heat shields is increasing rapidly, and several types of heat shields are actually available.
It is commercially available. [0003] Among them, a typical one is a heat obtained by depositing metal particles on a transparent resin film.
A line reflective film is adhered to a transparent substrate, which is very expensive.
In addition, the adhesion between the transparent substrate and the reflective film is generally poor,
Sometimes the reflective film peels off and has a curved surface due to difficulty in thermal processing.
It has a drawback that it is difficult to apply to window materials and the like. Also, this heat ray shield
Since the shielding plate has a half mirror shape, reflection obstruction may occur, and depending on the angle, transparency may occur.
There are also problems such as not being able to obtain. In addition, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-173060, a transparent tree
A heat ray shielding plate in which particles having heat ray reflecting ability are kneaded into fat has also been proposed.
The object is a translucent plate that diffuses transmitted light and is not suitable for windows of buildings and vehicles.
Will be. In addition, it causes the same reflection disturbance as that using a reflective film.
There is a disadvantage that. Furthermore, it is found in Japanese Patent Publication No. 43-25335.
As mentioned above, the use of an infrared absorber composed of an organic dye is conceivable.
The heat ray shielding plate used is transparent and has good workability. However, organic infrared absorbers are generally very expensive,
It is not economical to use a heat ray shielding plate made by adding an agent for building material applications.
In addition, there are many infrared absorbers that have a sharp absorption wavelength band that selectively absorbs near infrared light.
Although it exists, it has a broad absorption wavelength
The fact that infrared absorbers are not well known means that infrared absorbers
It is one of the reasons that it is hardly used for such purposes. Therefore heat ray shielding
In preparing the board, the total amount of light transmitted by adjusting the amount of infrared absorber added
When trying to control the excess rate, it is necessary to add a considerably large amount of infrared absorber
. On the other hand, a conventional transparent resin plate colored for glazing (colored with a dye and a pigment)
(Including transparent resin plate and heat ray reflective film bonded to transparent substrate)
Many have a transmittance of about 10 to 60%, and especially about 20 to 40%. Then, out of the total radiation energy of the sunlight, visible light (340 to 700)
nm) contains about 60% of the energy, so that
The degree of shielding reduces the glare of direct sunlight and the energy of direct sunlight.
The effect of shielding the lugies to some extent can be obtained. But visible light
If it is shielded more than necessary, the brightness will decrease and the total light transmittance will be about 20 to 40%.
Considered most appropriate. SUMMARY OF THE INVENTION [0007] The present invention has been made in view of the above-mentioned circumstances, and has a good object.
Excellent heat ray shielding performance while maintaining excellent transparency, and relatively inexpensive and excellent in workability
It is intended to provide a line shielding plate. Means for Solving the Problems The heat ray shielding plate according to the present invention which can solve the above problems is a conventional heat ray shielding plate.
While the board contained an infrared absorber, it seems to contain carbon black
Therefore, the infrared absorber and carbon black
It is characterized by comprising both. At this time, the content of the infrared absorber is
0.04 to 1.5 g / m ^Two And the content of carbon black is 0.01 to 0.3
g / m ^Two And These inclusion forms can be controlled independently of each other. And all light
The line transmittance is maintained at 10 to 60% as in the related art. Total light transmittance is 20 ~
It is desired to be 40%. The existence form of the infrared absorbent and the carbon black is not particularly limited.
The line absorber and carbon black are uniformly dispersed in plan view.
As for the state of dispersion in the thickness direction, even if the dispersion is uniform,
It doesn't matter. As a configuration example of the heat ray shielding plate, whether it is a single layer or a plurality of layers,
A plate that contains an infrared absorber and carbon black at the same time, a film that contains an infrared absorber and carbon black laminated on a transparent plate,
Alternatively, a composition containing an infrared absorber and carbon black is printed on a transparent plate
Or coatings are shown without limitation. As the transparent plate, a thermoplastic resin is most commonly used, but is not particularly limited.
As the infrared absorbing agent, 150 ppm of the infrared absorbing agent is added and a 3 mm-thick
Minimum light with a wavelength of 700 to 1400 nm when producing a methyl methacrylate plate
Those having a line transmittance of 20% or less are most commonly used, but are not particularly limited.
When an infrared absorber with a narrow wavelength range of the absorbed light is used as the infrared absorber,
In this case, the effect of improving the heat ray shielding performance and reducing the amount of the infrared absorbent used is large.
As carbon black, a carbon black with good dispersibility and effective in maintaining transparency
The back graft polymer is most commonly used, but is not particularly limited. DETAILED DESCRIPTION OF THE INVENTION Carbon black is contained in a heat ray shielding plate in an amount of 0.01 to 0.3 g / m 2. ^Two To be included. Mosquito
The amount of carbon black added is 0.3 g / m ^Two Above, the total light transmittance is low
0.01 g / m ^Two If less, add a combined infrared absorber
The amount cannot be reduced too much. Preferred amount of carbon black added
Is 0.03-0.2 g / m ^Two And a more preferable addition amount is 0.04 to 0.15 g /
m ^Two It is. Preferably, carbon black has an average particle diameter of 10 to 500 nm.
If the average particle size exceeds 500 nm, the particles may aggregate or become transparent.
It may cause poor appearance such as damage. On the other hand, when the average particle size is smaller than 10 nm,
Not only is it difficult to manufacture itself, but also the handling is reduced due to the fine powder. Carb
The preferred average particle diameter of the black particles is 10 to 100 nm, and more preferred average particles.
The diameter is between 10 and 60 nm. As carbon black, for example, channel black, furnace black
, Thermal black, acetylene black and the like. But carbon
Racks are generally prone to agglomeration and difficult to disperse.
ing. However, when a dispersant is used, there is a concern that physical properties may be deteriorated due to the dispersant.
If kneading during granulation and dispersion by external force,
Process and the process of dispersing carbon black are required,
I will. However, carbon black graft polymer as carbon black
In the case of using carbon black, such a problem is solved and the dispersion of carbon black is good.
A well-formed article can be produced. Especially, the molding method is acrylic resin
In the case of cast polymerization, the dispersion is good when mixed with
The effect of using the bon black graft polymer is further enhanced. [0014] The infrared absorber incorporated in the heat ray shielding plate of the present invention is not particularly limited.
When a polymethyl methacrylate plate having a thickness of 3 mm and an amount of 150 ppm was prepared,
Those having a minimum light transmittance of 20% or less in the wavelength range of 700 to 1400 nm
preferable. If the minimum light transmittance exceeds 20%, it means that the infrared absorber is red
This indicates that the external line absorption performance is poor.
Therefore, it may be inappropriate as an infrared absorbent used in the present invention. Further, polymethyl methacrylate containing 150 ppm of the above infrared absorber
The difference between the minimum light transmittance of the plate and the light transmittance at a wavelength of 600 nm is preferably 20% or more.
Preferably, it is 30% or more. Visible light transmittance at 600nm wavelength
It is a measure of the amount of light transmitted, and has a minimum light transmittance and light at a wavelength of 600 nm.
The fact that the difference in the line transmittance increases as described above means that the transmission amount of visible light is large.
It means that the surface infrared transmission is small and the performance as an infrared absorber is good
I do. On the other hand, when the visible light transmission is small, carbon black is added.
As a result, the amount of transmitted visible light is further reduced, and the brightness may be impaired. [0016] The radiant energy of sunlight is extremely small when it exceeds 1800 nm.
Therefore, about ／ of the infrared part of the radiant energy of sunlight is in the range of 700 to 1400 nm.
Enclosed in the box. Therefore, an infrared absorber having a performance of absorbing infrared rays in the range of 700 to 1400 nm is most suitable for the purpose of the present invention. The infrared absorber is contained in the heat ray shielding plate in an amount of 0.04 to 1.5 g / m. ^Two Add within the range.
1.5g / m ^Two If it exceeds, not only is it extremely expensive as a heat ray shielding plate,
Since it is used in combination with carbon black, the brightness may be impaired. 0.04g
/ M ^Two If the number is less, the heat ray shielding effect is small. More preferred
Or 0.1-1.0 g / m ^Two , More preferably 0.1 to 0.5 g / m ^Two Is
. Those satisfying the above preferable conditions for the infrared absorber, that is, 150 pp
When a polymethyl methacrylate plate having a thickness of 3 mm and a thickness of 3 mm
Infrared absorber with a minimum light transmittance of 20% or less in the range of 400 nm
For example, polymethine dyes, pyrylium dyes, thiopyrylium dyes,
Qualium-based dye, croconium-based dye, azulenium-based dye, phthalocyanine
Dyes, tetradehydrocholine dyes, dithiol metal complex dyes, naphthoki
Non-dye, anthraquinone-dye, triphenylmethane-dye, aminium-dye
Dyes, diimmonium-based dyes, and the like. In general, for example, Nippon Kayaku Co., Ltd. (IR-750, IRG-002, I
PG-003, IRG-022, IRG-023, IRG-820, CY-2,
CY-4, CY-9, CY-20), manufactured by Mitsui Toatsu Chemicals, Inc. (PA-001,
PA-1005, PA-1006, SIR-114, SIR-128, SIR-
130), manufactured by Fuji Photo Film Co., Ltd. (IRF-700, IRF-770,
IRF-800, IRF-905, IRF-1170) can be used.
It goes without saying that the present invention is not limited to the illustrated ones. In addition, not only one kind of infrared absorber but also a mixture of two or more kinds thereof is used.
If two or more types having different absorption wavelengths are used in combination,
The shielding effect may be improved. What is obtained by adding an infrared absorber and carbon black to a transparent plate is
If the color tone of the easing material is inappropriate, use a general dyeing method to obtain an appropriate color tone.
Toning can also be performed by adding additives. The transparent plate of the present invention is typically made of a resin. The resin used here
Resin that is substantially transparent and does not have large absorption and scattering,
Although not limited, specific examples thereof include polycarbonate resin; methyl
Acrylic resin such as methacrylate; polystyrene, polyvinyl chloride, polychlorinated
Polyvinyl resin such as vinylidene; Polio such as polyethylene and polypropylene
Refin-based resins; polyvinyl acetate resins such as polybutyral resins and polyvinyl acetate;
Polyester resin; polyamide resin and the like;
If there is, use not only one kind of resin but also a blend of two or more kinds of resin
Can be. In addition, use the above-mentioned resin sandwiched between transparent glass
Can also. [0023] Of these transparent resins, considering practical applications, particularly polycarbonate
Resin, (meth) acrylic resin, polyethylene resin, polyester resin (PET)
Resin, etc.), polystyrene resin or polyvinyl chloride is preferable.
Most preferred are carbonate resins, methacrylic resins and polyvinyl chloride. The polycarbonate resin is prepared by a solution method of dihydric phenol and a carbonate precursor.
Or produced by reacting by a melting method. Representative examples of dihydric phenols
Examples include the following. For example, 2,2-bis (4-hydroxyphenyl)
G) propane [bisphenol A], 1,1-bis (4-hydroxyphenyl)
Ethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bi
(4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4
-Hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydrido)
Roxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone and the like. Preferred divalent fu
Enols are based on bis (4-hydroxyphenyl) alkanes, especially bisphenols.
Is preferably used as a main component. As the acrylic resin, methyl methacrylate alone or methyl methacrylate
A polymerizable unsaturated monomer mixture containing 50% or more or a copolymer thereof is preferable. Meta
As the polymerizable unsaturated monomer copolymerizable with methyl acrylate, for example, acrylic
Methyl acrylate, ethyl (meth) acrylate (methyl acrylate or methacrylic acid
Methyl, the same applies hereinafter), butyl (meth) acrylate, (meth) acrylate
Clohexyl, 2-ethylhexyl (meth) acrylate, methyl (meth) acrylate
Toxiethyl, ethoxyethyl (meth) acrylate, 2- (meth) acrylate
Droxyethyl, N, N-diethylaminoethyl (meth) acrylate (meth) acrylate
Glycidyl acrylate, tribromophenyl (meth) acrylate, (meth) acrylic
Tetrahydroxyfurfuryl luate, ethylene glycol di (meth) acrylate
G, triethylene glycol di (meth) acrylate, tripropylene glycol
Rudi (meth) acrylate, trimethylolethanedi (meth) acrylate,
Opentyl glycol di (meth) acrylate, trimethylolpropane tri (
Meth) acrylate, pentaerythritol tetra (meth) acrylate, etc.
I can do it. As the vinyl chloride resin, not only a homopolymer of vinyl chloride alone but also vinyl chloride
Copolymers containing phenyl as a main component can also be used. Because it is copolymerized with vinyl chloride
The monomers that can be used include vinylidene chloride, ethylene, propylene, and acrylonitrile.
, Vinyl acetate, maleic acid, itaconic acid, acrylic acid, methacrylic acid, etc.
I can do it. In producing the heat ray shielding plate of the present invention, an ordinary transparent resin material is manufactured.
Various additives used in the process may be added. As an additive, for example, coloring
Agents, polymerization regulators, antioxidants, ultraviolet absorbers, flame retardants, plasticizers, rubber for improving impact resistance, and release agents. Method for Forming a Heat Shielding Plate Containing the Carbon Black and Infrared Absorber
There are extrusion molding, injection molding, casting polymerization, press molding, calendar molding,
Or a cast film forming method. As a method other than the above, a filter containing carbon black and a near-infrared absorbent is used.
Create a film and heat press or heat laminate the film on a transparent resin plate
By doing so, a heat ray shielding plate can be created. In addition, carbon black and
And acrylic resin ink or paint containing infrared absorber on transparent resin plate
Alternatively, a heat ray shielding plate can be obtained by coating. There is no particular limitation on the shape of the heat ray shielding plate, and the most common flat plate or film shape
In addition, various shapes such as a corrugated plate shape, a spherical shape, and a dome shape are included. Carbon fiber
The concentration of racks and infrared absorbers is expressed by weight per unit area in plan view.
However, an irregular shape such as a corrugated plate may be considered as the weight in the projected area from above. Ma
In addition, unless there is a problem in appearance, the distribution of carbon black and infrared absorber concentration
You can have them. Especially in the thickness direction, uniformity is not required.
Absent. EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples.
It is not limited by the embodiment. In the following examples, the total light transmittance was measured by NDH-300A manufactured by Nippon Denshoku Co., Ltd.
And measured according to JIS K 7105, and the solar transmittance was measured by Shimadzu Corporation.
Using UV-3100PC manufactured by JIS K 3106
Was. In Examples, parts and percentages are by weight unless otherwise specified. Example 1 100 parts of methyl methacrylate as a polymerizable material in a stainless steel beaker
Bon black graft polymer “CX-GLF-21” (manufactured by Nippon Shokubai Co., Ltd.
90pp with carbon content 33.3%, polymer component styrene-acrylic
m, (30 parts as carbon black with respect to 100 parts of methyl methacrylate
pm), infrared absorbent Kayasorb IRG-022 (manufactured by Nippon Kayaku Co., Ltd.)
) Was added and mixed (based on 100 parts of methyl methacrylate).
Dispersed in minutes. Dioctyl sulfosuccinate sodium is further added to the mixture as a release agent.
0.01 part of a salt and 2,2′-azobis-2,4-dimethylvale as a polymerization initiator
0.15 parts of lonitrile and 0.2 parts of benzotriazole as ultraviolet absorber
And mixed. This is poured into a mold previously set to have a thickness of 3 mm, and
Immerse in a water bath at 0 ° C for 5 hours, then heat in an air bath at 120 ° C for 2 hours
After completion of the polymerization, a resin plate having a thickness of 3 mm was obtained after cooling. Carbo per unit area
0.108 g / m ^Two , The amount of infrared absorber is 0.144 g / m ^Two When
Become. Example 2 Carbon black graft was added to 100 parts of methyl methacrylate as a polymerizable raw material.
90 ppm of polymer “CX-GLF-21” (30% as carbon black)
ppm), infrared absorber Kayasorb IRG-002 (Nippon Kayaku Co., Ltd.)
Example 3 was carried out in the same manner as in Example 1 except that 100 ppm of
I got a board. The amount of carbon black per unit area is 0.108 g / m ^Two , Infrared
0.36 g / m of absorbent ^Two Becomes Example 3 60 parts of polycarbonate resin (Panlite 1285Z manufactured by Teijin Chemicals Limited)
And 40 parts of channel black having an average particle size of 30 mm were heated and melt-mixed with a kneader.
Then crushed. To 100 parts of polycarbonate resin (Panlite 12 85Z manufactured by Teijin Chemicals Limited), 37.5 ppm of the above pulverized product (as carbon black,
15 ppm) and 70 ppm of infrared absorbent sample 1 were added and mixed with a blender.
After the joining, extrusion molding was performed using a T die to obtain a resin plate having a thickness of 3 mm. Per unit area
Of carbon black is 0.054 g / m ^Two , The amount of infrared absorber is 0.25
2g / m ^Two Becomes Example 4 100 parts of a methacrylic resin (SUMIPEX B manufactured by Sumitomo Chemical Co., Ltd.)
Carbon black graft polymer “CX-GLF-21” at 60 ppm (Carbon
20 ppm for infrared black), 65 ppm of infrared absorber sample 2 added
Then, after mixing with a blender, extrusion molding using a T-die, a resin having a thickness of 3 mm
I got a board. The amount of carbon black per unit area is 0.072 g / m ^Two , Infrared
0.234 g / m of absorbent ^Two Becomes Example 5 The same operation as in Example 3 was performed except that 130 ppm of Sample 3 was used as the infrared absorbent.
No resin plate having a thickness of 3 mm was obtained. The amount of carbon black per unit area is 0.
054 g / m ^Two , The amount of infrared absorber is 0.468 g / m ^Two Becomes IRG-022: substance name 2.5-cyclohexadiene-1,4-diylidene-bis [N, N-bis (4-dibutylaminophenyl) ammonium] bis (hexafluoroantimonate) IRG-002 : Substance name N, N-bis (4-dibutylaminophenyl) -N- [4- [N, N-bis (4-dibutylaminophenyl) amino] phenyl] -aminiumhexafluoroantimonate Sample 1: Substance name 3 2,6-octafluoro- (4,5-octakisanilino) oxyvanadium phthalocyanine Sample 2: Substance name 4,5-Octakisanilino- (3,6-octakisphenylthio) oxyvanadium phthalocyanine Sample 3: Substance Name 4,5-octakisbutylthio- (3,6-octakisphenylthio Oxyvanadium lid rosiglitazone cyanine The <Comparative Example 1> 100 parts of methyl methacrylate as a polymerizable raw material, infrared absorber Kayasor
b 40 ppm of IRG-022 (manufactured by Nippon Kayaku Co., Ltd.)
Dye Kayaset Blue A-2R1 instead of rack graft polymer
1 ppm, KayasetRed A-2G 14 ppm, KayasetGr
een AB 5 ppm, Kayaset YellowA-G 3 ppm (hereinafter referred to as
All the upper dyes were manufactured in the same manner as in Example 1 except that Nippon Kayaku Co., Ltd. was used.
A resin plate having a thickness of 3 mm was obtained. The amount of the infrared absorbent per unit area is 0.144 g /
m ^Two , The total amount of the dye is 0.1188 g / m ^Two Becomes Comparative Example 2 The amount of the infrared absorber Kayset IRG-022 was changed to 100 ppm.
Except for the above, the same procedure was performed as in Comparative Example 1 to obtain a resin plate having a thickness of 3 mm. The amount of the infrared absorbent per unit area is 0.360 g / m ^Two , The total amount of dyes is 0
. 1188 g / m ^Two Becomes Comparative Example 3 The amount of the carbon black kraft polymer was 300 ppm (with carbon black).
The same procedure as in Example 1 was carried out except that it was changed to 100 ppm).
A fat plate was obtained. The amount of carbon black per unit area is 0.36 g / m ^Two , Infrared
The amount of the absorbent is 0144 g / m ^Two Becomes The measured total light transmittance was 2.2% (%), which is not suitable for heat ray shielding. Comparative Example 4 Kayaset IRG-002 (manufactured by Nippon Kayaku Co., Ltd.) was used as an infrared absorber.
The same operation as in Comparative Example 1 was performed except that 00 ppm was used, and a resin plate having a thickness of 3 mm was obtained.
. The amount of the infrared absorbent per unit area is 0.36 g / m ^Two , The total amount of dye is 0.1
188 g / m ^Two Becomes Comparative Example 5 Kayaset IRG-002 (manufactured by Nippon Kayaku Co., Ltd.) was used as an infrared absorber.
Except using 20 ppm, it carried out similarly to the comparative example 1, and obtained the resin plate of board thickness 3mm.
. The amount of the infrared absorbent per unit area is 0.792 g / m ^Two , The total amount of the dye is 0.1.
1188 g / m ^Two Becomes Comparative Example 6 The amount of the carbon black kraft polymer was 300 ppm (with carbon black).
And the same procedure as in Example 2 except that the thickness was changed to 100 ppm.
A resin plate was obtained. The amount of carbon black per unit area is 0.36 g / m ^Two ,infrared
0.36 g / m of line absorber ^Two Becomes When the total light transmittance was measured, it was 1.2.
% (Which is%), which is not suitable for a heat ray shielding plate. Comparative Example 7 The amount of the carbon black kraft polymer was 210 ppm (with carbon black).
Example 2 except that the amount of the infrared absorbent was changed to 500 ppm.
And a resin plate having a thickness of 3 mm was obtained. Carbon black per unit area
0.252 g / m ^Two , The amount of the infrared absorber is 1.8 g / m ^Two Becomes When the total light transmittance was measured, it was 3.9% (%).
Not suitable. Comparative Example 8 Polycarbonate resin (Panlite 1285Z manufactured by Teijin Chemicals Limited) 100
Part, add 130 ppm of infrared absorbent sample 1 and mix with a blender.
After that, extrusion molding was performed using a T die to obtain a resin plate having a thickness of 3 mm. Per unit area
The amount of the infrared absorber is 0.468 g / m ^Two Becomes Comparative Example 9 An infrared absorber was added to 100 parts of a methacrylic resin (SUMIPEX B, manufactured by Sumitomo Chemical Co., Ltd.).
After adding 150 ppm of sample 2 and mixing with a blender, use a T die
Extrusion was performed to obtain a resin plate having a thickness of 3 mm. The amount of infrared absorber per unit area is
0.54g / m ^Two Becomes Comparative Example 10 The same operation as in Comparative Example 8 was performed except that 350 ppm of Sample 3 was used as the infrared absorbent.
No resin plate having a thickness of 3 mm was obtained. The amount of the infrared absorbent per unit area is 1.26.
g / m ^Two Becomes Comparative Example 11 Extrusion molding of a methacrylic resin (Sumipex B, manufactured by Sumitomo Chemical Co., Ltd.) using a T-die.
Then, a resin plate having a thickness of 3 mm was obtained. <Comparative Example 12> A dye Kyas was added to 100 parts of a methacrylic resin (Sumipex B, manufactured by Sumitomo Chemical Co., Ltd.).
et Blue A-2R 60ppm, Kayaset Red A-2G
30 ppm and 23 ppm of Kayaset Yellow AG were added,
After mixing with a render, the mixture was extruded using a T die to obtain a resin plate having a thickness of 2 mm.
. The total amount of dye per unit area is 0.2712 g / m ^Two Becomes <Comparative Example 13> Kayaset Green A-B 23 ppm, Kayaset
BlueA-2R 15ppm, KayasetRed A-2G 45ppm
, Comparative Example 11 except that the color was changed to 8 ppm of Kyoto Yellow AG
And a resin plate having a thickness of 2 mm was obtained. The total amount of dye per unit area is
0.2184 g / m ^Two Becomes Comparative Example 14 Carbon black kraft polymer “CX-GLF-21” was used instead of the dye.
Comparative Example 11 except that 30 ppm (10 ppm as carbon black) was used.
And a resin plate having a thickness of 2 mm was obtained. Carbon black per unit area
0.036 g / m ^Two Becomes Carbon blacks, infrared absorbers and dyes of Examples 1 to 4 and Comparative Examples 1 to 13
Table 1 shows the addition amount of, the value of total light transmittance and the value of solar radiation transmittance.
Charts showing the relationship between the transmittance and the wavelength of a typical one are shown in FIGS. Addition of 150 ppm of an infrared absorbing agent, 3 mm thick polymethyl methacrylate
A plate is prepared, and the wavelength showing the minimum light transmittance in the range of 700 to 1400 nm and its wavelength
The light transmittance at the wavelength and the light transmittance at 600 nm were measured with a spectrophotometer, and the values were measured.
Are shown in Table 2. (The method of preparing the polymethyl methacrylate plate was the same as in Example 1.
went. [Table 1] The greater the value of the total light transmittance, the greater the amount of visible light transmitted, the brighter the solar light transmittance.
Is smaller, the better the performance of shielding heat rays. [Table 2] As is clear from Table 1, the carbon black of the present invention and the infrared absorbent
The combined use of the heat ray shield plate and the infrared absorber alone or the infrared absorber and dye
About half the amount of infrared absorbers used and the type of infrared absorber
It is clear that some types have the same heat ray shielding effect with the following usage.
Call Further, as shown in Comparative Examples 3, 6, and 7, the carbon black exceeds the range of the present invention.
When using (A) or an infrared absorber, the total light transmittance is too low.
Not suitable for heat shields. As shown in FIGS. 1 and 2, when a dye was added to the infrared absorbent, the transmittance of visible light was reduced.
But the transmittance is low overall when carbon black is added.
I'm down. This is because carbon black has infrared absorption performance
Conceivable. 3 and 4, a large absorption peak in the range of 1600 nm or more.
Is the absorption inherent in the substance of the polycarbonate resin or the acrylic resin. Effect of the Invention By using carbon black and an infrared absorber in combination, it is possible to use only the infrared absorber alone.
Alternatively, as compared with the case where an infrared absorber and a dye are used, the heat ray shielding effect is equal to or more than that, and the addition amount of the infrared absorber can be reduced. Ie car
Create a transparent resin plate by adding Bon Black and an infrared absorber to a specific amount of transparent resin
By doing so, the transparency is good and the heat ray shielding effect is excellent, and it is relatively inexpensive.
In addition, it is possible to provide a heat ray shielding plate having good workability.

[Brief description of the drawings]   FIG.   4 is a chart showing the relationship between light transmittance and wavelength in Example 1 and Comparative Examples 1 and 2.   FIG. 2   6 is a chart showing the relationship between light transmittance and wavelength of Example 2 and Comparative Examples 4 and 5.   FIG. 3   13 is a chart showing the relationship between light transmittance and wavelength in Example 3 and Comparative Example 8.   FIG. 4   13 is a chart showing the relationship between light transmittance and wavelength of Comparative Examples 11 to 12.

Claims (1)

[Claims 1 infrared absorber 0.04~1.5g / m ^2, comprising 0.01 to 0.3 g / m ² of carbon black, a total light transmittance of 10% to 60% A heat shielding plate with excellent transparency. 2. The heat ray shielding plate according to claim 1, wherein the heat ray shielding plate uses a thermoplastic resin. 3. The heat ray shielding plate according to claim 1, wherein the carbon black is a carbon black graft polymer. 4. A wavelength of 700 to 1400 n in a 3 mm-thick polymethyl methacrylate plate prepared by adding 150 ppm of said infrared absorbing agent.
The heat ray shielding plate according to any one of claims 1 to 3, wherein the minimum light transmittance of m is 20% or less.