JP2004082120A - Heat ray blocking plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat ray blocking plate coated with a heat-ray blocking paint containing black pigment forming coating having an excellent heat ray blocking property. <P>SOLUTION: The heat ray blocking plate is formed by coating a metal substrate material with heat-ray blocking paint composition containing fluorine-based resin or chlorine base resin as a binding component. The black pigment has solar reflectivity not less than 8.0% in a wavelength region 780-2100nm, and reflectivity not more than 15% at any wavelength in a visible region wavelength 400-700nm, and comprises baked pigments containing Fe<SB>2</SB>O<SB>3</SB>indispensably and at least one of Cr<SB>2</SB>O<SB>3</SB>and Mn<SB>2</SB>O<SB>3</SB>, or baked pigments containing Fe<SB>2</SB>O<SB>3</SB>, Cr<SB>2</SB>O<SB>3</SB>, Mn<SB>2</SB>O<SB>3</SB>, and NiO. The heat-ray blocking plate. <P>COPYRIGHT: (C)2004,JPO

Description

(4) The present invention relates to a heat ray shielding paint that can be applied to a roof or an outer wall of a building, a vehicle, a ship, a plant, a shed, a barn, and the like.

塗料 Paints with various hues are used for various structures such as roofs of buildings. However, carbon black usually used as a black pigment for producing various hues easily absorbs solar energy. For this reason, in structures where a coating film obtained from a paint containing carbon black is installed, the internal temperature must be raised, which not only impairs the comfort of the living space and the storability of articles, but also increases air conditioning. A huge amount of energy is consumed.

Patent Documents 1 and 2 each disclose the use of various metal oxide and composite oxide pigments as solar heat shielding pigments. However, in order to obtain a paint having high blackness, conventional carbon black is used. Inevitably, the heat ray shielding effect is small. In addition, Patent Document 3 proposes a composite oxide pigment as a black pigment, but the pigment has a solar reflectance of less than 8% and a small heat ray shielding effect.

On the other hand, Patent Documents 4 and 5 disclose achromatic colors by mixing red, orange, yellow, green, blue, and violet pigments having high solar radiation reflectance in the ultraviolet and near-infrared regions. A solar heat shielding black paint composition colored black has been proposed. However, there has been a problem that a part of the coloring pigment is deteriorated due to long-term use, the color balance is lost, and the color is easily discolored.
JP-A-1-121371 JP-A-1-261466 JP-A-2-185572 Japanese Patent No. 2593968 JP-A-5-293434

目的 An object of the present invention is to provide a heat ray shielding paint containing a black pigment capable of obtaining a coating film having excellent heat ray shielding performance.

The heat ray shielding plate of the present invention has a solar reflectance of 8.0% or more in a wavelength range of 780 to 2100 nm, and has a reflectance at that wavelength of any wavelength of 400 to 700 nm in the visible region. 15% or less, a calcined pigment containing Fe ₂ O ₃ as an essential component and containing at least one of Cr ₂ O ₃ and Mn ₂ O ₃ , or Fe ₂ O ₃ , Cr ₂ O ₃ , Mn ₂ O It is characterized in that the metal base material is coated with a heat ray shielding coating composition containing a black pigment composed of a baked pigment containing ₃ and NiO, and containing a fluorine-based resin or a chlorine-based resin as a binder component.

The above black pigment, a Fe ₂ O _3, and Cr ₂ O ₃ and / or Mn ₂ O ₃ may be a sintered pigment containing 20 to 100 wt%.

上 記 The heat ray shielding coating composition may contain the black pigment in an amount of 0.1% by weight or more. Further, it is preferable that the above black pigment is contained in an amount of 0.5% by weight or more in all the pigment components.

The heat ray shielding coating composition preferably contains a polyester resin, an acrylic resin, a fluorine-based resin or a chlorine-based resin as a binder component, and may further contain a melamine resin and / or a blocked isocyanate as needed. . Further, the heat ray shielding plate of the present invention is coated with the above heat ray shielding paint composition.

熱 Since the heat ray shielding paint of the present invention has a black pigment having a specific composition, a coating film having excellent heat ray shielding performance can be obtained.

熱 The heat ray shielding coating composition of the present invention contains a black pigment having a solar reflectance of 8.0% or more in a wavelength range of 780 to 2100 nm.

(4) The black pigment used in the heat ray shielding paint has a solar reflectance of 8.0% or more, and preferably 15.0% or more. The solar reflectance is a reflectance described in JIS A 5759, and is a reflectance weighted by the intensity of each wavelength in the wavelength range of 780 to 2100 nm of sunlight. When the solar reflectance is less than 8.0%, sufficient heat ray shielding properties cannot be obtained, and when the paint is applied to a roof or an outer wall of a building, a vehicle, a ship, a plant, a barn, a barn, etc., the internal temperature is reduced. Cannot be sufficiently reduced.

黒 色 Here, the black pigment means a pigment whose appearance looks from black to brown.

Black pigment having a solar reflectance as described above, the Fe ₂ O _3, Cr ₂ O ₃ and / or Mn ₂ shall O ₃ and which is a fired inorganic pigments containing 20 to 100% by weight being preferred. That is, this calcined pigment is characterized by containing Fe ₂ O ₃ as an essential component and containing at least one of Cr ₂ O ₃ and Mn ₂ O _3. Is contained in a total amount of 20 to 100% by weight, preferably 30 to 100% by weight. When the content is less than 20% by weight, the heat ray shielding performance may not be sufficiently exhibited.

Here, the fired pigment is usually manufactured by firing at 600 ° C. or higher and then pulverizing.

The heat ray shielding coating composition of the present invention contains the above-mentioned black pigment as an essential component. However, in order to respond to the hue of the target coating, the purpose of use, the required performance, and the like, extender pigments as other coloring pigments and other pigments are included. Or a pigment containing a brilliant pigment. In this case, it is preferable that the coating composition contains the black pigment in an amount of 0.1% by weight or more. If it is less than 0.1% by weight, the heat ray shielding performance may not be sufficiently exhibited. In addition, the above-mentioned black pigment is preferably contained in all the pigment components in an amount of 0.5% by weight or more. The larger the content, the more the difference in the heat shielding performance can be increased as compared with the conventional paint of the same hue. . If the amount is less than 0.5% by weight, the same hue may not be able to sufficiently exhibit the shielding performance.

熱 The heat ray shielding coating composition of the present invention may contain a coloring pigment other than the above-mentioned black pigment and other pigments.

The coloring pigment is used for adjusting the hue of the paint, and includes an organic coloring pigment and an inorganic coloring pigment. Organic coloring pigments include phthalocyanine, azo, condensed azo, anthraquinone, perinone / perylene, indigo / thioindigo, isoindolinone, azomethineazo, dioxazine, quinacridone, aniline black, triphenyl Examples include methane-based pigments, and examples of inorganic color pigments include titanium oxide-based, iron oxide-based, iron hydroxide-based, chromium oxide-based, spinel-type baked pigments, lead chromate-based, permillion chromate-based, navy blue-based, and aluminum. Powder, bronze powder and the like.

体 Examples of the extender include calcium carbonate, barium sulfate, silicon oxide, and aluminum hydroxide. Further, organic crosslinked particles and inorganic particles can also be blended as extenders.

On the other hand, examples of the glitter pigment include mica pigment, aluminum foil, tin foil, gold foil, silver foil, titanium gold foil, stainless steel foil, and metal foil pigments such as nickel and copper.

The type and form of the heat ray shielding coating composition of the present invention are not particularly limited, and may be, for example, a thermosetting coating, a thermoplastic coating, a room temperature drying type coating, a room temperature curing type coating, or an active energy ray curing type coating. The paint may be in any form such as a solvent paint, a water paint, a non-aqueous emulsion paint, a solventless paint, a powder paint, and the like.

The coating composition of the present invention includes, for example, an acrylic resin, an alkyd resin, a polyester resin, a silicone-modified polyester resin, a silicone-modified acrylic resin, an epoxy resin, a polycarbonate resin, a silicate resin, a fluorine-based resin, and a chlorine-based resin as a binder component. May be included. Among these, a polyester resin, an acrylic resin, a fluororesin, or a chlorine-based resin is preferable.

Further, if necessary, an amino resin such as a melamine resin, a crosslinking resin such as an isocyanate, or a block isocyanate may be contained as a curing agent.

熱 The heat ray shielding coating composition of the present invention may contain a fine particle filler, an additive, a solvent, and the like, if necessary.

As the particulate filler is not particularly limited, for _{example, SiO 2, TiO 2, Al} 2 O 3, Cr 2 O 3, ZrO 2, Al 2 O 3 · SiO 2, 3Al 2 O 3 · 2SiO 2 And fine particles of zirconia silicate and the like, and fibrous or granular fine glass.

The additives are not particularly limited, and include, for example, matting agents such as silica and alumina, defoaming agents, leveling agents, anti-sagging agents, surface conditioners, viscosity adjusters, dispersants, ultraviolet absorbers, waxes and the like. Conventional additives and the like can be mentioned.

The solvent is not particularly limited as long as it is generally used for paints, and examples thereof include aromatic hydrocarbons such as toluene, xylene, Solvesso 100 and Solvesso 150; and esters such as ethyl acetate and butyl acetate. Ketones such as methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and isophorone; and water. These are appropriately selected in consideration of solubility, evaporation rate, safety, and the like. These may be used alone or in combination of two or more.

The heat ray shielding paint of the present invention contains a black pigment having a solar reflectance in consideration of the intensity of each wavelength in sunlight as described above, and has a wavelength near 780 to 2100 nm, which is a heat source in the sunlight. Since it reflects infrared rays effectively, it can exert an excellent effect particularly as a solar heat shielding paint.

塗料 The coating composition of the present invention can be produced, for example, as follows. Using a machine generally used for dispersing pigments such as a roller mill, paint shaker, pot mill, disper, sand grind mill, etc., the above pigment is mixed with the pigment dispersing resin to prepare a pigment dispersing paste, and the above binder is prepared. By adding a melamine resin and / or a blocked isocyanate, an additive, a solvent, and the like, a coating composition can be obtained.

The coating method of the coating composition is not particularly limited, and examples thereof include commonly used coating methods such as dipping, brushing, roller, roll coater, air spray, airless spray, curtain flow coater, roller curtain coater, and die coater. And the like. These are appropriately selected depending on the purpose of use of the substrate.

熱 The heat ray shielding plate, which is the coated product of the present invention, is coated with the above-mentioned heat ray shielding coating composition of the present invention. The thickness of the coating film formed on the coating varies depending on the type of the coating material and the application, but is usually from 5 to 300 μm as a dry film thickness.

基材 The substrate on which the heat ray shielding paint of the present invention is applied is not particularly limited, and examples thereof include a metal substrate, a plastic substrate, and an inorganic material substrate. Examples of the metal substrate include an aluminum plate, an iron plate, a galvanized steel plate, an aluminum galvanized steel plate, a stainless steel plate, and a tin plate. Examples of the plastic substrate include substrates such as acrylic, PVC, polycarbonate, ABS, polyethylene terephthalate, and polyolefin. Examples of the inorganic substrate include a ceramic substrate and a glass substrate described in JIS A 5422 and A 5430 and the like.

表面 The above-mentioned substrate may be subjected to a surface treatment for imparting adhesion and rust prevention. Further, an undercoat paint may be applied, or a back paint may be applied to the back surface of the base material.

The following pigments were prepared as black pigments.
(1) Black pigment A
Fe ₂ O ₃ 75 wt%, Cr ₂ O ₃ 25 wt% of the composite oxide calcined pigment (2) Black Pigment B
Fe ₂ O ₃ 40 wt%, Cr ₂ O ₃ 60 wt% of the composite oxide calcined pigments (3) Black Pigment C
Fe ₂ O ₃ 80 wt%, Mn ₂ O ₃ 20 wt% of the composite oxide calcined pigment (4) Black Pigment D
Composite oxide-based baked pigment of 5% by weight of Fe ₂ O _3, 25% by weight of Cr ₂ O ₃ , 15% by weight of Mn ₂ O ₃ and 45% by weight of NiO (5) Black pigment E
63% by weight of Cr ₂ O ₃ , 5% by weight of MnO ₂ , 32% by weight of CuO ₂
Composite oxide-based fired pigment of 59% by weight of Cr ₂ O ₃ and 41% by weight of CuO (7) Black pigment G
Fe ₂ O ₃ 54 wt%, MnO ₂ 28% by weight, CuO18 wt% of composite oxide calcined pigments (8) Black Pigment H
Carbon black pigment (trade name "Monarch 1300", manufactured by Cabot Corporation)
The spectral reflection spectrum of each of the above black pigments was measured. For a coating film (film thickness 20 to 40 μm) obtained by dispersing each pigment in a binder at a concentration of 20 to 40 parts by weight (phr), a spectrophotometer (U-3500 spectrophotometer, manufactured by Hitachi, Ltd.) was used. It measured using.

FIG. 3 shows the spectra of pigments A and D and pigments E and H. Here, the pigments A and D show high reflectance in the near infrared region of 780 to 2100 nm.

反射 The reflectance in the wavelength range of 780 to 2100 nm of each black pigment measured as described above was calculated as the solar reflectance according to the method described in JIS A 5759. The solar reflectance of each pigment is as follows.

-Black pigment A: 54%
-Black pigment B: 48%
-Black pigment C: 21%
-Black pigment D: 20%
-Black pigment E: 7%
-Black pigment F: 6%
-Black pigment G: 5%
-Black pigment H: 1%

Example 1
<Preparation of paint>
107 parts by weight of a methyl methacrylate-based acrylic resin (nonvolatile content: 25%) and 80 parts by weight of a black pigment A were charged into a container, mixed by stirring until uniform, then transferred to a paint shaker and dispersed for 2 hours. To this dispersion, 127 parts by weight of polyvinylidene fluoride powder, 110 parts by weight of the above-mentioned acrylic resin, and 76 parts by weight of isophorone were added with stirring to prepare a coating composition.

<Preparation of test piece>
The coating material obtained as described above is applied on a base material of an aluminum plate having a thickness of 0.8 mm using a bar coater so that a dry film thickness becomes 20 μm, and dried at 250 ° C. for 2 minutes. To form a coating film to prepare a test piece.

<Evaluation of coating film>
About the obtained coating film on the test piece, the Munsell value was measured by a color difference meter of Hunter manufactured by Suga Test Instruments Co., Ltd., and the gloss was measured by gloss meter UGK-5K manufactured by Suga Test Instruments Co., Ltd. The spectral reflectance spectrum was measured, and the solar reflectance was calculated. The spectral reflectance spectrum was determined using a barium sulfate-based white paint having a high reflectance as a reference (reflectance: 100%) using a spectrophotometer (U-3500 spectrophotometer, manufactured by Hitachi, Ltd.). Measured.

反射 Based on the spectral reflectance spectrum measured as described above, the reflectance of the coating film was calculated in the same manner as the solar reflectance of the pigment. Table 1 shows the measurement results.

<Evaluation of heat ray shielding properties>
With respect to the above test pieces, the heat ray shielding property was evaluated using the test apparatus 10 shown in FIG. As shown in FIG. 2, the test piece 1 is fitted on the upper surface of the styrofoam box 7 with the coating film facing upward, and the test piece 1 is irradiated by an incandescent lamp 2 provided above the test piece 1. The temperature was measured by the temperature sensor 3 installed on the back surface of the sample 1 and the temperature sensor 4 installed in the test box 7, and the measured temperature was recorded by the recorder 5.

The incandescent lamp 2 was turned on by the power supply 6.

３２０ As the test piece, a size of 320 mm × 230 mm was used. As the test box 7, a styrene foam box having a thickness of 30 mm and dimensions of 350 mm × 250 mm × 250 mm was used. The distance 8 between the test piece 1 and the incandescent lamp 2 was 150 mm.

As the recorder 5, a thermo recorder RT-10 (manufactured by Tabai Espec Corp.) was used, and as the incandescent lamp 2, a Toshiba reflex lamp RF110V200W (manufactured by Toshiba Corporation) was used. In addition, the test was performed in a constant temperature room at 20 ° C. with no wind. FIG. 1 shows the measurement temperature results. Table 1 shows the temperature at the time when the temperature reached a certain temperature.

Examples 2, 3, 4 and 5
A coating material was prepared in the same manner as in Example 1 except that the black pigment shown in Table 1 was used, and in the same manner as in Example 1 except that sunlight was used outdoors instead of an incandescent lamp (lamp). The coating film and the heat ray shielding property were evaluated. Table 1 shows the results. FIG. 1 shows the measurement temperature results in Example 4.

Example 6
Instead of using the black pigment of Example 1, coloring paints 1, 2, 3, and 4 in the same manner as in Example 1 except that titanium oxide, ferric oxide, cobalt blue, and chromium titanium yellow were used as coloring pigments, respectively. 4 was prepared. Colored paints obtained using titanium oxide, ferric oxide, cobalt blue, and chromium titanium yellow are referred to as colored paints 1, 2, 3, and 4, respectively. Next, using the black paint of Example 4 and the above-mentioned colored paints 1 to 4, the color was adjusted so that the Munsell value became H = 0.19B, V = 3.43, and C = 0.48. A paint was prepared, and the coating film and the heat ray shielding property were evaluated. FIG. 4 shows the spectral reflection spectrum of the coating film.

Example 7
Similarly to Example 6, using the black paint of Example 4 and the above-mentioned colored paints 1 to 4, the color was adjusted so that the Munsell value H = 0.43 PB, V = 3.55 C = 0.81. Then, a blue paint was prepared, and the evaluation of the coating film and the heat ray shielding property were performed.

Example 8
Next, using the black paint of Example 4 and the above-mentioned colored paints 1 to 4, the color was adjusted so that the Munsell value became H = 2.05YR, V = 2.84, and C = 6.01. A paint was prepared, and the coating film and the heat ray shielding property were evaluated.

Examples 9 and 10
In Example 9, the coating film and the heat ray shielding property were evaluated in the same manner as in Example 1 except that a galvanized steel sheet was used for the substrate, and in Example 10, the film thickness was set to 80 μm.

Reference Example 11
A container was charged with 195 parts by weight of a polyester resin (non-volatile content: 65%) and 80 parts by weight of pigment A, mixed with stirring until uniform, then transferred to a paint shaker and dispersed for 2 hours. To this dispersion, 78 parts by weight of a methylated melamine resin (70% nonvolatile content) and 83 parts by weight of cyclohexanone were added with stirring to prepare a coating material, and the coating film and the heat ray shielding property were evaluated.

Reference Example 12
A coating material was prepared in the same manner as in Reference Example 11 except that a silica-based matting agent (Nip Seal E-200, manufactured by Nippon Silica Industry Co., Ltd.) was added to the adjusted coating material so as to be 5% by weight. The evaluation and the heat ray shielding property were evaluated.

Comparative Examples 1-4
A coating material was prepared in the same manner as in Example 1 except that the pigments shown in Table 2 were used as the black pigment, and the coating film and the heat ray shielding property were evaluated. FIG. 1 shows the evaluation results of the heat ray shielding property.

Comparative Example 5
A coating material was prepared in the same manner as in Example 1 except that the pigments shown in Table 2 were used as the black pigment, and the evaluation of the coating film and the evaluation of the heat ray shielding property using sunlight instead of an incandescent lamp were performed. .

Comparative Example 6
A gray paint was prepared in the same manner as in Example 6 using the black paint of Comparative Example 1, and the coating film and the heat ray shielding property were evaluated. FIG. 4 shows the spectral reflection spectrum of the coating film.

Comparative Example 7
A blue paint was prepared using the black paint of Comparative Example 1 in the same manner as in Example 7, and the evaluation of the coating film and the heat ray shielding property were performed.

Comparative Example 8
A rust-colored paint was prepared in the same manner as in Example 8 using the black paint of Comparative Example 1, and the evaluation of the coating film and the heat ray shielding property were performed in the same manner as in Example 1.

Comparative Examples 9 and 10
In the same manner as in Example 1 except that the black paint of Comparative Example 1 was used, the galvanized steel sheet was used for the substrate in Comparative Example 9, and the film thickness was 80 μm in Comparative Example 10, evaluation of the coating film and heat rays were performed in the same manner as in Example 1. The shielding property was evaluated.

Comparative Example 11
A coating material was prepared in the same manner as in Reference Example 11 using the black pigment E, and the coating film and the heat ray shielding property were evaluated.

Comparative Example 12
A coating material was prepared in the same manner as in Comparative Example 11 except that a silica-based matting agent (Nip Seal E-200, manufactured by Nippon Silica Industry Co., Ltd.) was added to the adjusted coating material so as to be 5% by weight. The evaluation and the heat ray shielding property were evaluated.

FIG. 1 is a diagram showing the measured temperature results of Examples 1, 4 and Comparative Example 1 obtained as described above. As shown in FIG. 1, the temperature inside the test piece and the inside of the test box reached a substantially constant temperature with the elapse of time. Are lower by about 29 ° C. and 13 ° C., respectively. Also in the test box, the coating films of Examples 1 and 4 are 6 ° C. and 3 ° C. lower than Comparative Example 1, respectively.

Tables 1 and 2 show the temperatures of the respective test pieces when they reached a certain temperature. As is clear from the results of Tables 1 and 2, the black pigments A, B, C, and D used in Examples have a solar reflectance of 8% or more in a wavelength range of 780 to 2100 nm. The solar reflectance of the blended coating film was higher than that of the coating film of the comparative example.

場合 In addition, when the coating film of each example was used, the temperature of the back surface of the substrate (back surface of the test piece) and the temperature in the box were lower than those of the comparative example. In particular, the temperature in the box differs depending on the hue, and the effect is greater as the color becomes deeper, but the temperature is lower by about 2 to 9 ° C. This temperature difference, when applied to buildings such as dwellings and warehouses, is a value that cannot be ignored from the comfort of living space, indoor cooling efficiency, and storability of stored items. Therefore, it was found that the coating films of the examples had excellent heat shielding properties or solar heat shielding properties.

4 is a graph showing the heat ray shielding properties of coating films formed from the coating materials of Examples and Comparative Examples of the present invention. FIG. 2 is a simplified diagram showing an apparatus for evaluating the heat ray shielding property of a coating film. 4 is a graph showing spectral reflection spectra of black pigments in Examples and Comparative Examples of the present invention. 4 is a graph showing spectral reflection spectra of coating films formed from the coating materials of Examples and Comparative Examples of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Test piece 2 ... Incandescent lamp 3, 4 ... Temperature sensor 5 ... Recorder 6 ... Power supply 7 ... Styrofoam test box 8 ... Between test piece and incandescent lamp Distance 10: Heat ray shielding evaluation device

Claims (6)

The solar reflectance in the wavelength range of 780 to 2100 nm is 8.0% or more, and the reflectance at that wavelength is 15% or less in any of the visible region wavelengths of 400 to 700 nm, and Fe _From a calcined pigment containing ₂ O ₃ as an essential component and containing at least one of Cr ₂ O ₃ and Mn ₂ O ₃ or a calcined pigment containing Fe ₂ O ₃ , Cr ₂ O ₃ , Mn ₂ O ₃ and NiO A heat-shielding plate comprising a metal substrate coated with a heat-shielding coating composition containing a black pigment as described above and a fluorine-based resin or a chlorine-based resin as a binder component. The black pigment, and Fe ₂ O _3, it is sintered pigments and Cr ₂ O ₃ and / or Mn ₂ O ₃ containing 20 to 100 wt%, claim 1 heat ray shielding plate according. The heat ray shielding plate according to claim 1 or 2, wherein the black pigment is contained in the coating composition in an amount of 0.1% by weight or more. The heat ray shielding plate according to any one of claims 1 to 3, wherein the black pigment is contained in the total pigment component in an amount of 0.5% by weight or more. The heat ray shielding plate according to any one of claims 1 to 4, wherein the metal substrate is an aluminum plate, a galvanized steel plate, an aluminum galvanized steel plate, an iron plate, or a tin plate. The heat ray shielding plate according to any one of claims 1 to 4, wherein the metal substrate is an aluminum plate or an aluminum galvanized steel plate.

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