JP2011248023A - Reflecting member and lighting equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflecting member having a reflecting surface containing silver which inhibits discoloration of the silver for a long period of time without reducing the reflectivity of a visible light.SOLUTION: The reflecting member 1 includes: a base material 11; a reflecting layer 14 which is provided on the base material 11 or through an undercoat layer 12 formed on the base material 11, contains silver and has a reflecting surface 13 for reflecting incident light; and a topcoat layer 15 which is formed on the reflecting surface 13 and protects the reflecting layer 14. Any one of the base material 11 and the undercoat layer 12 or the topcoat layer 15 contains a triazine-based compound having a light absorption peak in a wavelength range of 250-420 nm. According to this structure, the light in the wavelength range of 250-420 nm is absorbed by at least any one of the base material 11 and the undercoat layer 12 or the topcoat layer 15, which can inhibit discoloration of the silver contained in the reflecting layer 14 for a long period of time without reducing the reflectivity of a visible light.

Description

  The present invention relates to a reflecting member that includes silver and has a reflecting surface that reflects incident light, and a lighting fixture using the reflecting member.

  Conventionally, silver having excellent light reflectivity has been used for a reflective layer of a reflective member that reflects light from a light source of a lighting fixture. In particular, when silver having a high reflectance is used for a deep bowl-shaped reflecting member such as a downlight, light is repeatedly reflected in the reflecting member, and the light utilization efficiency can be improved. However, silver is chemically unstable and tends to discolor. The discoloration of silver in the reflecting member not only deteriorates the appearance of the reflecting member but also reduces the reflectance and reduces the light utilization efficiency.

  As a cause of discoloration of silver, light (particularly ultraviolet rays), heat, and moisture in the atmosphere, sulfurous acid gas, hydrogen sulfide, ammonia, and other gases can be cited. Generally, these causes of discoloration interact, and silver atoms on the reflecting member surface react with sulfide ions, chloride ions, etc., and change into compounds such as silver sulfide, silver chloride, etc. It is thought to change to black.

  One of the causes of silver discoloration is that the silver thin film has a “window” of transmittance that transmits light in the ultraviolet region near the wavelength of 325 nm (see, for example, Patent Document 1). . In the above-mentioned Patent Document 1, ultraviolet rays that have passed through the “window” of the transmittance deteriorate the resin undercoat layer in contact with the silver, and “small bubbles” of carbon dioxide gas are generated. It describes the discoloration of silver.

  Therefore, in the reflective member described in Patent Document 1, by forming a polymer layer containing an organic ultraviolet absorber, the ultraviolet light incident on the reflective layer is shielded, and the ultraviolet light to the “window” having the above transmittance is formed. Is prevented and silver discoloration is suppressed. Further, it is known that a benzotriazole-based ultraviolet absorber used as an ultraviolet absorber forms a yellow color by forming a chelate with silver. Therefore, the first polymer layer containing mercaptan is formed on the reflective layer, and the second polymer layer containing the ultraviolet absorber is formed thereon, whereby the benzotriazole-based ultraviolet absorber is directly reflected on the silver reflective layer. I try not to react with.

In addition, a reflective member that prevents ultraviolet rays from entering the reflective layer and prevents silver discoloration by covering the reflective layer with a topcoat layer containing an ultraviolet-absorbing solid instead of an organic ultraviolet absorber. It is known (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 61-154942 Japanese Patent Laid-Open No. 7-108643

  However, it is known that benzotriazole-based ultraviolet absorbers diffuse in the polymer and chelate with silver to develop a yellow color. Therefore, when the reflective member described in Patent Document 1 is used for a long period of time, the benzotriazole-based UV absorber contained in the first polymer layer penetrates into the second polymer layer, reaches the reflective layer, There is a risk of discoloring silver. In addition, many of the benzotriazole-based ultraviolet absorbers cannot sufficiently block ultraviolet rays near the wavelength of 320 nm because the light absorption peak around the wavelength of 320 nm corresponding to the “window” of the transmittance is reduced.

  In addition, since the UV-absorbing solid substance described in Patent Document 2 is a particulate substance, when added to the topcoat layer, visible light scattering occurs and the transmittance of the topcoat layer decreases. In addition, the reflectivity of the reflecting member may be reduced.

  This invention solves the said subject, Comprising: The reflecting member which can suppress discoloration of silver over a long period, without reducing the reflectance of visible light, and a lighting fixture using this reflecting member The purpose is to provide.

  In order to solve the above problems, a reflecting member according to the present invention is provided with a base material and an undercoat layer formed on the base material or on the base material, and includes silver and incident light. A reflective layer having a reflective surface that reflects, and a topcoat layer that is formed on the reflective surface and protects the reflective layer, wherein at least one of the substrate and the undercoat layer or the topcoat layer has a wavelength It contains a triazine compound having a light absorption peak in the range of 250 to 420 nm.

  Further, in the reflective member according to the present invention, the top coat layer is formed by laminating two or more layers, the layer in contact with the reflective layer contains a triazine compound, and the layer not in contact with the reflective layer is: It may contain a benzotriazole compound.

  Preferably, the triazine compound is a 2,4-bis- (4-phenylphenyl) -6- (2-hydroxyphenyl) -1,3,5-triazine compound.

  Moreover, the lighting fixture which concerns on this invention uses the said reflection member.

  According to the reflecting member of the present invention, at least one of the base material or the undercoat layer or the topcoat layer absorbs light in the wavelength range of 250 to 420 nm, without reducing the reflectance of visible light, Discoloration of silver contained in the reflective layer can be suppressed over a long period of time, and by using this reflective member, a lighting fixture with good light utilization efficiency can be obtained.

The side view of the lighting fixture using the reflective member which concerns on the 1st Embodiment of this invention. The fragmentary sectional side view of the reflection member. The figure which shows the relationship between the film thickness of silver in the reflection member containing silver, and a total light transmittance. (A)-(c) is a sectional side view explaining the discoloration mechanism of silver. The side view of the said reflection member. The figure which shows the relationship between the molecular radiation power of the light radiate | emitted from the light source used by this embodiment, and its wavelength distribution. The fragmentary sectional side view of the reflection member which concerns on the 2nd Embodiment of this invention. The fragmentary sectional side view of the reflection member which concerns on the 3rd Embodiment of this invention.

  A reflecting member and a lighting fixture using the reflecting member according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6. The luminaire 2 using the reflecting member 1 of the present embodiment is a luminaire used for general facilities, stores, houses, etc. Here, as shown in FIG. Show. The luminaire 2 includes a light source 3 and a reflecting member 1 for reflecting light from the light source 3. The reflection member 1 is formed in a bowl shape that spreads from the base end where the socket 4 for mounting the light source 3 is provided to the opening in the light emitting direction. The base end portion of the reflecting member 1 is connected to the main body portion 5 of the lighting fixture 2, and a leaf spring 6 for locking the lighting fixture 2 to the back of the ceiling is attached to the opening. The main body 5 is provided with an appropriate inverter 7 and the like suitable for the light source 3.

  As shown in FIG. 2, the reflection member 1 includes a base material 11, an undercoat layer 12 formed on the base material 11, and a reflective layer 14 that includes silver and has a reflective surface 13 that reflects incident light. And a top coat layer 15 that is formed on the reflective surface 13 and protects the reflective layer 14. The topcoat layer 15 includes an ultraviolet shielding agent 16 having a light absorption peak in the wavelength range of 250 to 420 nm.

  The substrate 11 is not particularly limited as long as it is made of a material that can withstand the heat generated from the light source 3. Moreover, the shape of the base material 11 is not limited to the above-described ridge shape, and is formed so as to efficiently reflect light from the light source 3 and realize a desired light distribution according to the specifications of the lighting fixture 2 and the like. Anything is acceptable.

  When the substrate 11 is formed of a resin material, examples of the thermoplastic resin include polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyphenylene sulfide (PPS), and polyphenylene oxide (PPO). ), Polyimide (PI), polyetherimide (PEI), polycarbonate (PC), liquid crystal polymer (LCP), syndiotactic polystyrene (SPS), and the like. Moreover, as a thermosetting resin, the unsaturated polyester (UP) etc. which are generally used as a material for bulk molding compounds (BMC) are used, for example. In order to improve light reflection performance, heat resistance, strength, light resistance and the like, these resin materials may be added with various additives such as inorganic fillers. A known method such as injection molding, compression molding, vacuum molding, pressure molding, or the like is selectively used as the molding method of the base material 11 depending on the material and the shape of the instrument.

  When the base material 11 is formed of a metal material, for example, an aluminum (Al) base alloy, a magnesium (Mg) base alloy, an iron (Fe) base alloy, a zinc (Zn) alloy, or the like is used. As the forming method, spinning, pressing, die casting, thixo molding, or the like is selectively used in consideration of the material and the required shape of the reflecting member 1 and the like. Moreover, when using glass as the base material 11, press work, blow work, etc. are used. The surface of the substrate 11 is desirably a smooth and clean surface, and the mold release agent, gas mark, lubricant, oil, etc. adhering during molding are removed by physical or chemical means.

  The undercoat layer 12 is formed to improve the adhesion between the substrate 11 and the reflective layer 14 and improve the smoothness of the substrate 11. Therefore, if the base material 11 consists of resin materials and adhesiveness with the reflective layer 14 and smoothness are fully ensured, it does not necessarily need to be formed. The undercoat layer 12 is formed from a coating film made of a resin material such as an acrylic resin, a silicone resin, a fluororesin, an epoxy resin, or a melamine resin. As the film forming method, a known method such as spray coating, spin coating, roll coating, dip coating or the like is selectively used. Moreover, well-known means, such as a heat | fever, an ultraviolet-ray, an electron beam, are used for the hardening method. In addition, although the film thickness of the undercoat layer 12 is not specifically limited, For example, 5-30 nm is desirable. If the thickness of the undercoat layer 12 is 30 nm or more, there is a possibility that the shape of the base material 11 designed in advance in consideration of the light irradiation direction may be affected.

  The reflective layer 14 is formed by forming silver or an alloy containing silver as a main component with a thickness of 20 to 1000 nm. As a forming method, a PVD method such as a sputtering method, a vacuum deposition method, or an ion plating method is used, and a chemical precipitation method such as a silver chain reaction may be used. Silver or an alloy containing silver as a main component may be laminated on the reflective surface 13 side of the reflective layer 14 with a thickness of 20 nm or more. In order to improve the heat resistance and adhesion of the reflective layer 14, the component on the base material 11 side of the reflective layer 14 may contain a metal other than silver, such as aluminum, copper, or nickel.

  The top coat layer 15 is formed on the reflection surface 13 of the reflection layer 14 in order to protect the reflection layer 14. Similar to the undercoat layer 12, the topcoat layer 15 is formed of a coating film made of a resin material such as an acrylic resin, a silicone resin, a fluororesin, an epoxy resin, or a melamine resin. As with the undercoat layer 12, a known coating method such as spray coating, spin coating, roll coating, dip coating, or the like is used. In addition, although the well-known means, such as a heat | fever and an electron beam, is used for the hardening method, the means which does not affect the reflection layer 14 is desirable.

  In the present embodiment, a triazine compound is used as the ultraviolet shielding agent 16 having a light absorption peak in the wavelength range of 250 to 420 nm. Preferred are hydroxyphenyl triazine compounds, and more preferred are 2,4-bis- (4-phenylphenyl) -6- (2-hydroxyphenyl) -1,3,5-triazine compounds.

  As a specific example of 2,4-bis- (4-phenylphenyl) -6- (2-hydroxyphenyl) -1,3,5-triazine compound, 2- [2- Hydroxy-4- [1-octyloxycarbonylethoxy] phenyl] -4,6-bis (4-phenylphenyl) -1,3,5-triazine (“Tinuvine 497” manufactured by Ciba Japan Co., Ltd.).

  The addition amount of the ultraviolet shielding agent 16 is desirably 0.5 to 5% by weight with respect to the coating material forming the top coat layer 15, and a more preferable addition amount is 1 to 2%. If the added amount is less than 0.5%, the ultraviolet ray shielding effect is insufficient, and if it is more than 5%, the absorption edge extends to the visible light region, the reflecting member 1 is colored yellow, and the appearance is deteriorated. It may be a cause. It should be noted that additives such as a light stabilizer and an antioxidant may be appropriately added to the coating material forming the top coat layer 15.

  Here, in the lighting fixture 2 using the reflective layer 14 containing silver, the mechanism etc. in which silver discolors are demonstrated with reference to FIG. 3 thru | or FIG.

  FIG. 3 shows a change in light transmittance due to a difference in film thickness when pure silver having a purity of 99.99% is formed on a quartz substrate by using a magnetron sputtering method. From this figure, it is confirmed that when the film thickness of the silver film is reduced, there is a so-called “transmission” window in which the transmittance of ultraviolet rays in the wavelength range of 250 nm to 420 nm increases. This “window” of transmittance is confirmed in an example in which the ultraviolet region near the wavelength of 320 nm is the peak and the film thickness is 170 nm. As the film thickness is reduced, both the wavelength region and the transmittance are increased. In the example where the film thickness is 65 nm, the transmittance of light having a peak at a wavelength of 320 nm reaches 27%. In this case, about 30% of the ultraviolet light having a wavelength of about 320 nm out of the ultraviolet light emitted from the light source is formed under the silver film (the reflective layer 14 of the present embodiment) without being reflected or absorbed by the silver film. It reaches the surface of the layer (undercoat layer 12 of this embodiment).

Ultraviolet rays that have passed through the reflective layer 14 and reached the surface of the undercoat layer 12 degrade the resin of the undercoat layer 12 as shown in FIG. (.OR) is generated. Then, the generated .OH or .OR oxidizes silver atoms (Ag) of the reflective layer 14 in contact with the undercoat layer 12 to generate silver ions (Ag ⁺ ) as shown in FIG. In the example, only OH is shown). The generated Ag ⁺ diffuses into the undercoat layer, and OH diffuses into the undercoat layer 12 as OH ⁻ . Then, as shown in FIG. 4 (c), these Ag ⁺ and OH ^- and react, by dark brown silver oxide _(Ag 2 0) is generated, discoloration of silver occurs.

  In order to suppress the discoloration of silver, it is conceivable to make the film thickness of the reflection layer 14 sufficiently thick so as not to make a “window” of transmittance in the reflection layer 14. However, as shown in FIG. 5 (see also FIG. 1), for example, the reflecting member 1 used in the lighting fixture 2 has many three-dimensional shapes, and it is difficult to uniformly form a thick silver film on the entire surface. It is difficult to manufacture. FIG. 5 shows a film thickness distribution for each position of the reflecting member 1 when a silver film is formed on the inner surface of the reflecting member having the shape illustrated in FIG. 1 by using a magnetron sputtering method. In this example, there is a film thickness difference of about 6 to 10 times between the base of the reflecting member 1 and the end in the light emitting direction, and the reflecting member 1 is close to the light source 3 and can be exposed to high-intensity ultraviolet rays. The film thickness on the base side is reduced. The film thickness on the base side of the reflecting member 1 in this example is 26.4 to 40.4 nm. With reference to the result shown in FIG. 3, it is considered that there is a “window” of transmittance.

  It is also conceivable to attach to the lighting fixture 2 a light source 3 that does not emit ultraviolet light having a wavelength of around 320 nm. However, in general, there is a considerable amount of ultraviolet light having a wavelength of about 320 nm in the irradiation light of the fluorescent lamp or HID lamp used as the light source 3 of the lighting fixture 2. FIG. 6 shows an example of ultraviolet intensity characteristics of a general-purpose fluorescent lamp. In this example, in addition to the peak wavelength of UV-A (365 nm), the peak wavelength of UV-B (315 nm) exists near the “window” region of the transmittance of the reflective layer 14. Further, it is not appropriate to limit the light source 3 to a specific product that does not emit ultraviolet rays having a wavelength of around 320 nm because the versatility of the light source is lacking. Moreover, in outdoor lighting or the like, the reflecting member 1 may be exposed to light environments other than the light source 3 of the lighting fixture 2 such as sunlight.

  Therefore, in order to suppress the discoloration of silver, it is necessary to provide a shielding layer that shields light in the region so that light in the wavelength range of 250 to 420 nm does not enter the interface between the reflective layer 14 and the undercoat layer 12. It is valid. In the present embodiment, of the light emitted from the light source 3, light in the wavelength range of 250 to 420 nm is absorbed by the ultraviolet shielding agent 5 included in the topcoat layer 15, converted into thermal energy, and consumed. . Therefore, light in the wavelength range of 250 to 420 nm does not reach the interface between the reflective layer 14 and the undercoat layer 12, and silver discoloration can be suppressed.

  In the present embodiment, a triazine compound is used as the external line shielding agent 5. This triazine-based compound can absorb ultraviolet rays having a wavelength of around 320 nm, which cannot be sufficiently shielded by conventional benzotriazole-based ultraviolet absorbers. Therefore, the reflective layer 14 containing silver is thin, and even in the reflective layer 14 having the transmittance “window”, ultraviolet rays having a wavelength of about 320 nm may reach the interface between the reflective layer 14 and the undercoat layer 12. No discoloration of silver can be suppressed.

  In addition, the triazine compound has a property that it is difficult to form a chelate with silver as compared with the benzotriazole ultraviolet absorber. Therefore, even if the topcoat layer 15 containing the ultraviolet shielding agent 16 is formed on the reflective surface 13 containing silver, the discoloration of silver can be suppressed over a long period of time.

  Of the light emitted from the light source 3, light in a wavelength region that is not absorbed by the ultraviolet shielding agent 16, that is, visible light is reflected by the reflective surface 13 containing silver having a high reflectance after passing through the top coat layer 15. The light is emitted from the end of the reflecting member 1 in the light emitting direction. That is, according to the reflecting member 1 of the present embodiment, silver discoloration can be suppressed over a long period of time without reducing the reflectance of visible light. Further, by using this reflecting member, it is possible to obtain a lighting fixture in which the light utilization efficiency is hardly lowered.

  Next, a reflecting member according to a second embodiment of the present invention will be described with reference to FIG. In the reflecting member 1 of the present embodiment, the undercoat layer 12 contains the ultraviolet shielding agent 16 having a light absorption peak in the wavelength range of 250 to 420 nm.

The base material 11 and the reflective layer 14 are the same as those in the first embodiment. The topcoat layer 15 is the same as that of the first embodiment except that the topcoat layer 15 does not include the ultraviolet shielding agent 16. The resin material constituting the undercoat layer 12 and the topcoat layer 15 is the same as that in the first embodiment. The topcoat layer 15 may be formed by vacuum deposition or the like from a layer made of an inorganic material such as SiO ₂ or TiO ₂ . Further, this inorganic layer may be provided between the reflective layer 14 and the topcoat layer 15.

  The addition amount of the ultraviolet shielding agent 16 in the undercoat layer 12 is desirably 2 to 10% by weight with respect to the paint forming the undercoat layer 12. If the addition amount is less than 2%, the amount of the ultraviolet shielding agent 16 existing at the interface between the undercoat layer 12 and the reflective layer 14 is not sufficient, and the undercoat layer is caused by the ultraviolet rays transmitted through the “window” of the transmittance. 12 may deteriorate and discolor silver. Moreover, since the material cost of the undercoat layer 13 will become high when there are more addition amounts than 10%, it is unpreferable.

  In the present embodiment, the light emitted from the light source 3 passes through the top coat layer 15 and is reflected by the reflecting surface 13 containing silver having a high reflectance, and from the end of the reflecting member 1 in the light emitting direction. Emitted. On the other hand, part of the light having a wavelength in the range of 250 to 420 nm passes through the “window” having the transmittance of the reflective layer 14 and reaches the undercoat layer 12, where it is absorbed by the ultraviolet shielding agent 16 and becomes thermal energy. It is converted and consumed. Therefore, even when light in the wavelength range of 250 to 420 nm passes through the transmittance “window” and reaches the interface between the reflective layer 14 and the undercoat layer 12, silver discoloration can be suppressed.

  By the way, in the said 1st Embodiment, since the ultraviolet-ray shielding agent 16 is contained in the topcoat layer 15, some light of a short wavelength area | region among the visible lights radiate | emitted from the light source 3 is ultraviolet-shielded. It was absorbed by the agent 16 and the reflectance was slightly lowered. On the other hand, in this embodiment, since the ultraviolet shielding agent 16 is not included in the topcoat layer 15, it is possible to prevent a reduction in the reflectance of visible light in the short wavelength region and increase the light utilization efficiency.

  Next, a reflecting member according to a third embodiment of the present invention will be described with reference to FIG. The reflective member 1 of the present embodiment includes a top coat layer 15 in which two or more layers are laminated, and a layer in contact with the reflective layer 14 (hereinafter referred to as a first top coat layer 15a) includes a triazine compound 16a. The layer not in contact with the reflective layer 14 (hereinafter, the second topcoat layer 15b) contains the benzotriazole compound 16b. Here, a configuration having two top coat layers 15a and 15b is shown, but the top coat layer 15 may have three or more layers.

  The base material 11, the undercoat layer 12, and the reflective layer 14 are the same as those in the first embodiment. The material constituting the first topcoat layer 15a and the second topcoat layer 15b is the same as that of the topcoat layer 15 of the first embodiment, and preferably has the same refractive index, respectively, at the interface between them. A material that hardly causes total reflection is used.

  As the triazine-based compound 16a included in the first topcoat layer 15a, the same one as in the first embodiment is used. Examples of the benzotriazole compound 16b included in the second topcoat layer 15 include 2- (2H-benzotriazol-2-yl) -6- (1-methyl-1-phenylethyl) -4- (1, 1,3,3-tetramethylbutyl) phenol, 2- (2-hydroxy-5-t-butylphenyl) -2H-benzotriazole and the like are used.

  For example, when a light source 3 that emits ultraviolet light having a light intensity such as a high-intensity HID lamp is used as the light source 3, the topcoat layer 15 itself deteriorates, the light transmittance is reduced, and the reflectance of the reflecting member 1 is reduced. May decrease. The triazine-based compound in the first embodiment well absorbs ultraviolet rays in the short wavelength region, but cannot sufficiently absorb ultraviolet rays in the long wavelength region (UV-A (365 nm)). On the other hand, the benzotriazole-based compound contained in the second topcoat layer 15b can absorb ultraviolet rays (UV-A (365 nm)) in a longer wavelength region than the triazine-based compound.

  Thus, in this embodiment, the top coat layer 15 is made into a plurality of layers, and a plurality of types of ultraviolet shielding agents 16a and 16b having different light absorption characteristics are used in each layer, so that a wide range of ultraviolet rays from short wavelengths to long wavelengths can be obtained. Can be absorbed. Thereby, even when the reflecting member 1 is exposed to high-intensity ultraviolet rays, the light resistance deterioration of the topcoat layer 15 can be remarkably suppressed. Further, the first topcoat layer 15a is interposed between the second topcoat layer 15b containing the benzotriazole compound 16b and the reflective layer 14, thereby preventing the chelate between the benzotriazole compound and silver. Silver discoloration can be suppressed.

  In addition, since the benzotriazole type compound diffuses in the polymer, it can penetrate into the first top coat layer 15a from the second top coat layer 15b and discolor the silver of the reflecting member 1. However, as described above, by providing the layer containing the benzotriazole-based compound, the light resistance deterioration of the topcoat layer 15 can be remarkably suppressed, so that the light resistance of the reflecting member 1 can be relatively improved. it can.

<Example 1>
Example 1 corresponds to the reflecting member 1 of the first embodiment.

  Coating liquid: 100 parts by mass of acrylic resin (“A-817” manufactured by DIC Corporation), 16 parts by mass of melamine resin (“Uban 122” manufactured by Mitsui Chemicals, Inc.), 50 parts by mass of ethyl acetate, and 50 parts by mass of butyl acetate And 30 parts by mass of diacetone alcohol were prepared to prepare a mixed solution. Further, as the ultraviolet shielding agent 16, 2- [2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl] -4, 6-bis- (4-phenylphenyl) -2,3,5-triazine (“Tinuvin 497” manufactured by Ciba Japan Co., Ltd.) was added so as to be 1.5 mass% based on the solid content of the above mixture. The coating liquid of Example 1 was prepared by stirring for minutes.

  Substrate 11: A bowl-shaped molded body was prepared by injection molding a PBT resin. The inner surface of the bowl-shaped molded body was wiped off with absorbent cotton containing 2-propanol to obtain a substrate 11 having a clean surface.

  Undercoat layer 12: After the epoxy-modified acrylic melamine paint (manufactured by Takashi Kubo Paint) is dried, it is spray-coated on the substrate 11 so as to have a film thickness of 5 microns, and baked and dried at 140 ° C. for 30 minutes. Been formed.

  Reflective layer 14: formed by magnetron sputtering using a target made of 99.99% pure silver. The film thickness of each part was as shown in FIG. The film thickness can be measured by attaching a small piece of glass with polyimide tape to each measurement site before film formation, peeling the tape after film formation, and measuring the step using a stylus type step measuring instrument. it can.

  Top coat layer 15: After the prepared coating liquid of Example 1 is dried, it is spray-coated on the reflective surface 13 of the reflective layer 14 so as to have a film thickness of 8 microns, and baked and dried at 120 ° C. for 30 minutes. Been formed.

<Example 2>
Example 2 corresponds to the reflecting member 1 of the second embodiment.

  Coating liquid: Epoxy-modified acrylic melamine paint (manufactured by Takashi Kubo Paint) as an ultraviolet shielding agent 16, 2- [2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl] -4,6-bis (4- Example 2 by adding phenylphenyl) -1,3,5-triazine (manufactured by Ciba Japan Co., Ltd. (Tinuvin 497)) to 3% by mass with respect to the solid content of the above mixture and stirring for 5 minutes. A coating solution was prepared.

  Base material 11 and reflective layer 14: The same as in Example 1.

  Undercoat layer 12: After the prepared coating liquid of Example 2 was dried, it was formed by spray coating on the substrate 11 so as to have a film thickness of 5 microns and baking and drying at 140 ° C. for 30 minutes.

  Top coat layer 15: The coating agent prepared in the same manner as in Example 1 except that the ultraviolet shielding agent 16 was not added was spray-coated on the reflecting surface 13 of the reflecting layer 14 so that the film thickness after drying was 8 microns. It was formed by baking and drying at 120 ° C. for 30 minutes.

<Example 3>
Example 3 corresponds to the reflecting member 1 of the third embodiment.

  Coating liquid for the first topcoat layer 15a: 100 mass parts of acrylic resin (“A-817” manufactured by DIC Corporation), 16 parts by mass of melamine resin (“Uban 122” manufactured by Mitsui Chemicals), and ethyl acetate 50 mass parts, 50 parts by mass of butyl acetate, and 30 parts by mass of diacetone alcohol are mixed, and further, 2- [2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl] is obtained as the triazine compound 16a. -4,6-bis (4-phenylphenyl) -1,3,5-triazine ("Tinubin 497" manufactured by Ciba Japan Co., Ltd.) was added to 1.5% by mass with respect to the solid content of the above mixture. By stirring for 5 minutes, a coating solution for the first topcoat layer 15a was prepared.

  Coating liquid for second top coat layer 15b: 100 parts by mass of acrylic resin (“A-817” manufactured by DIC Corporation), 16 parts by mass of melamine resin (“Uban 122” manufactured by Mitsui Chemicals, Inc.), and 50 ethyl acetate Part by mass, 50 parts by mass of butyl acetate and 30 parts by mass of diacetone alcohol are mixed, and further, as a benzotriazole-based compound, 2- (2H-benzotriazol-2-yl) -6- (1-methyl-1 -Phenylethyl) -4- (1,1,3,3-tetramethylbutyl) phenol ("Tinuvin 928" manufactured by Ciba Japan) was added to 2% by mass with respect to the solid content of the mixture, By stirring for 5 minutes, a coating solution for the second topcoat layer 15b was prepared.

  Substrate 11, undercoat layer 12, and reflective layer 14: Same as Example 1.

  Top coat layer 15: After the coating liquid for the first top coat layer 15a is dried, it is spray-coated on the reflective surface 13 of the reflective layer 14 so as to have a film thickness of 5 microns, and baked and dried at 120 ° C. for 30 minutes. A first topcoat layer 15a was formed. Then, after drying the coating agent for the second topcoat layer 15b, it is spray-coated on the first topcoat layer 15a so as to have a film thickness of 5 microns, and baked and dried at 120 ° C. for 30 minutes to form the second topcoat. Formed.

<Comparative example>
Coating liquid: 100 parts by mass of acrylic resin (“A-817” manufactured by Dainippon Ink & Chemicals, Inc.), 0.2 part of benzotriazole ultraviolet absorber (“Tinuvin 328” manufactured by Teva Japan), and melamine resin (Mitsui Chemicals Co., Ltd. "Uban 122") 16 mass parts, 50 mass parts of ethyl acetate, 50 mass parts of butyl acetate, and 30 mass parts of diacetone alcohol were mixed, and the coating liquid of the comparative example was prepared.

  Base material, undercoat layer, reflective layer: the same as in Example 1.

  Topcoat layer: the same as in Example 1 except that the adjusted coating solution of Comparative Example was used.

<Evaluation method>
Light reflectivity: Each of the reflecting members of Examples 1 to 3 and Comparative Example was cut into 30 mm squares, and the total light reflectance at a wavelength of 555 nm was measured using a self-recording spectrophotometer.

<Light resistance>
Each reflecting member was cut to a width of 50 mm, and irradiated with a mercury lamp for 30 days at a UV intensity of ² mW / cm ² in a thermostatic chamber at 100 ° C. atmosphere. Then, each reflecting member was cut into a 30 mm square, and the total light reflectance at a wavelength of 555 nm was measured using a self-recording spectrophotometer. Moreover, the tracing paper was covered on the sample and the external appearance was observed. The evaluation results are shown in Table 1 below.

  As shown in Table 1, in Examples 1 to 3, no silver discoloration occurred, and the effect of the reflecting member 1 in the above embodiment was recognized. On the other hand, in the comparative example, brown discoloration was observed.

  Note that the present invention focuses on the fact that a silver thin film has a “window” that transmits ultraviolet light having a wavelength of around 320 nm, and shields the ultraviolet light including this wavelength region and makes it difficult to form a chelate with silver. A triazine compound is used as the ultraviolet shielding agent. However, a similar ultraviolet shielding agent having the same properties as this triazine-based compound may be added, and the present invention is not limited to the above-described embodiment, and various modifications are possible.

DESCRIPTION OF SYMBOLS 1 Reflective member 11 Base material 12 Undercoat layer 13 Reflective surface 14 Reflective layer 15 Topcoat layer 16 Ultraviolet shielding agent (triazine compound)
16a Triazine compound 16b Benzotriazole compound 2 Lighting equipment

Claims (4)

A base material, a reflective layer provided on the base material or through an undercoat layer formed on the base material, having a reflective surface containing silver and reflecting incident light, and formed on the reflective surface And a top coat layer for protecting the reflective layer,
At least one of the base material, the undercoat layer, or the topcoat layer contains a triazine compound having a light absorption peak in a wavelength range of 250 to 420 nm. The top coat layer is formed by laminating two or more layers,
The layer in contact with the reflective layer contains a triazine compound.
The reflective member according to claim 1, wherein the layer not in contact with the reflective layer contains a benzotriazole-based compound.   2. The triazine compound is a 2,4-bis- (4-phenylphenyl) -6- (2-hydroxyphenyl) -1,3,5-triazine compound. The reflecting member according to 2.   The lighting fixture using the reflection member as described in any one of Claims 1 thru | or 3.

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