JP2007317550A - Heat ray transmission visible light reflecting body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat ray transmission visible light reflecting body of which the structure is simple, which can be manufactured easily, and which has superior heat ray transmissivity and reflectance of visible light. <P>SOLUTION: This is heat ray transmissive visible light reflecting body 31 which comprises a plastic foam, in which the entire reflection ratio A of the visible light of wavelength 550 nm is 30% or higher, in which the difference (B-C) of the transmissivity B of the heat wave of the wavelength 1,200 nm and the transmissivity C of the visible light of the wavelength 550 nm is 15% or higher. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat ray transmitting visible light reflector made of a plastic foam. The heat ray transmitting visible light reflector of the present invention is used as, for example, a light reflector such as a lighting fixture, various blindfolds, and the like.

  In a lighting fixture provided with a light reflecting plate, visible light emitted from the light source is reflected by the light reflecting plate to ensure a certain illuminance, but at the same time, heat rays are also reflected by the light reflecting plate. Therefore, there is a problem that an article in the vicinity of the place where the lighting apparatus is installed is thermally deformed or discolored.

  In order to solve the above-described problem, a multilayered reflector having visible light reflectivity and heat ray transmittance has been proposed (Patent Document 1). The reflector of Patent Document 1 includes a substrate having a film forming surface, a visible light reflecting infrared transmissive film provided on the film forming surface, and a metal oxide having a photocatalytic action provided on the visible light reflecting infrared transmissive film surface. And a photocatalyst layer mainly composed of.

JP-A-9-293405

  However, since the reflector of Patent Document 1 has a multilayer structure in which a substrate, a visible light reflecting infrared transmission film, and a photocatalyst layer are laminated, the recyclability is poor and the structure is complicated and difficult to manufacture.

  The present invention has been made in view of the above circumstances, and is basically made of a resin and bubbles, so that it has good recyclability, has a simple structure, can be easily manufactured, and has excellent heat ray transmission. It is an object to provide a heat ray transmissive visible light reflector having a property and a visible light reflectivity.

  In order to achieve the above-mentioned object, the present invention is made of a plastic foam, has a total reflectance A of visible light having a wavelength of 550 nm of 30% or more, a transmittance B of heat rays having a wavelength of 1200 nm, and a transmittance of visible light having a wavelength of 550 nm. Provided is a heat ray transmitting visible light reflector characterized in that a difference BC with C is 15% or more.

  The heat ray transmitting visible light reflector of the present invention can be easily manufactured by adding an inert gas under pressure to the raw material resin, and then heating and foaming the raw material resin to a temperature higher than the softening temperature of the raw material resin. Can do.

  Also, there are fine bubbles, and the difference between the total reflectance A of visible light having a wavelength of 550 nm, the transmittance B of heat rays having a wavelength of 1200 nm and the transmittance C of visible light having a wavelength of 550 nm, and the porosity are Since it is the above-mentioned range, it has both excellent heat ray transmittance and visible light reflectivity.

  On the other hand, if the total reflectance A of visible light having a wavelength of 550 nm is less than 30%, the reflector becomes too transparent and cannot be used as a light reflector or a blindfold. If the difference BC between the transmittance B of heat rays having a wavelength of 1200 nm and the transmittance C of visible light having a wavelength of 550 nm is less than 15%, it cannot be said that there is a function of separating heat rays and visible light.

  The heat ray transmitting visible light reflector of the present invention preferably has a porosity of 0.08 or more. If the porosity is less than 0.08, the function of sufficiently separating heat rays and visible light may not be exhibited.

  In the heat ray transmitting visible light reflector of the present invention, the more preferable range of the total reflectance A of visible light having a wavelength of 550 nm is 50% or more, more preferably 70% or more, still more preferably 85% or more, and the wavelength of 1200 nm. A more preferable range of the difference BC between the transmittance B of heat rays and the transmittance C of visible light having a wavelength of 550 nm is 20% or more, more preferably 30% or more, and even more preferably 50% or more. A more preferable range is 0.10 to 0.95, still more preferably 0.15 to 0.8, and still more preferably 0.30 to 0.75.

  The heat ray transmitting visible light reflector of the present invention suitably has an average bubble diameter of 100 nm or less, particularly 30 to 80 nm.

  The heat ray transmissive visible light reflector of the present invention suitably has a heat ray transmittance of 30 to 90% and a heat ray reflectivity of 10 to 70%, which will be described later.

  The heat ray transmitting visible light reflector of the present invention has both excellent heat ray transmittance and visible light reflectivity, can be easily manufactured with a simple single layer structure, and has good recyclability.

  Hereinafter, the present invention will be described in more detail. Examples of the material of the raw material resin used for producing the heat ray transmitting visible light reflector of the present invention include amorphous resins such as polyethersulfone (PES), polyetherimide (PEI), and polysulfone (PSU). it can. Of these, polyethersulfone is particularly preferred. In addition, resin may be used individually by 1 type and may be used in mixture of 2 or more types.

  In the present invention, as long as the properties are not affected, the raw material resin includes a crystallization nucleating agent, a crystallization accelerator, a bubble nucleating agent, an antioxidant, an antistatic agent, an anti-UV agent, a light stabilizer, a fluorescent agent. Various additives such as whitening agents, pigments, dyes, compatibilizers, lubricants, reinforcing agents, flame retardants, cross-linking agents, cross-linking aids, plasticizers, thickeners, thinning agents may be blended. Moreover, the resin containing the said additive may be laminated | stacked on the obtained plastic foam, and the coating material containing the said additive may be coated.

  The method for producing the heat ray transmissive visible light reflector of the present invention is not particularly limited, but the step of holding the raw resin sheet in a pressurized inert gas atmosphere and containing the inert gas in the raw resin sheet, and the inert gas It can manufacture with the manufacturing method which consists of the process of heating and foaming the raw material resin sheet containing a normal pressure.

  In this case, considering the mass productivity, for example, the following method is preferably used. That is, a sheet made of a raw material resin is produced, a roll is formed by winding the sheet and a separator, and the roll is held in a pressurized inert gas atmosphere so that the sheet contains an inert gas. Furthermore, it is preferable to use a method in which a sheet containing an inert gas is heated to a temperature equal to or higher than the softening temperature of the raw material resin and foamed under normal pressure.

  Examples of the inert gas include helium, nitrogen, carbon dioxide, and argon. The inert gas permeation time and the inert gas permeation amount until the raw material resin sheet is saturated vary depending on the type of resin to be foamed, the type of inert gas, the permeation pressure, and the thickness of the sheet. As the inert gas, carbon dioxide is more preferable in consideration of gas permeability (rate, solubility) to the resin.

  The heat ray transmitting visible light reflector of the present invention can be used in various applications, for example, spotlights, headlights, illumination lamps, photographic reflex plates, plant factory light sources, backlight units of liquid crystal display devices, solar It can be used for indoor lighting using light, reflected light system combined with heat sink, semi-transparent blindfold window material, greenhouse wall material, etc. For example, if it is used for a photographic reflex plate, only the brightness can be supplied without raising the temperature of the subject, and if it is used as a light / illumination reflector, only the brightness can be reflected forward. . Furthermore, by attaching a heat sink to the back surface of the reflecting plate, it is possible to release heat from the light source in the back surface direction. Moreover, if it uses as a light guide tube which introduce | transduces sunlight into a room | chamber interior, it will become possible to introduce | transduce only the light of visible light except a heat ray in a room | chamber interior. In addition, by sticking the heat ray transmitting visible light reflector of the present invention having a relatively high visible light transmittance to the window, it becomes translucent and can be used as a blindfold in the room as an alternative to shoji and frosted glass. Since it is expensive, it is possible to incorporate only the heat rays of winter sunlight, which helps to save energy. For the same reason, it is also useful as a greenhouse wall material.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the following examples. In this example, measurement and evaluation of various properties of the obtained plastic foam were as follows.

(density)
The density (ρf) of the plastic foam and the density (ρs) of the raw material resin before foaming were measured by an underwater substitution method.

(Porosity)
It calculated as 1- (ρf / ρs).

(Confirmation of the presence or absence of holes)
It observed from the SEM photograph of the cross section of a plastic foam sheet.

(Total reflectance)
The total reflectance at a wavelength of 550 nm was measured using a spectrophotometer (UV-3101PC: manufactured by Shimadzu Corporation). In Table 1, the diffuse reflectance of each plastic foam is shown as a relative value, assuming that the diffuse reflectance of the white plate obtained by hardening the fine powder of barium sulfate is 100%.

(Transmittance)
Using a spectrophotometer (UV-3101PC: manufactured by Shimadzu Corporation), transmittance at wavelengths of 1200 nm and 550 nm was measured.

(Transmissivity difference)
Using transmittance B at a wavelength of 1200 nm and transmittance C at a wavelength of 550 nm, BC was defined as a transmittance difference.

(Heat ray permeability)
The measurement system of FIG. 1 was prepared, and the temperature change (ΔT) of the thermocouple 12 45 seconds after the halogen lamp 10 was turned on was measured. The temperature change from room temperature when the sample 14 is not placed is ΔT (0), the temperature change from the room temperature when the sample 14 is placed is ΔT (S), and ΔT (S) / ΔT (0) is the heat ray transmittance. Defined. The distance between the halogen lamp 10 and the thermocouple 12 was 200 mm, and the distance between the halogen lamp 10 and the sample 14 was 120 mm.

(Heat ray reflectivity)
The measurement system of FIG. 2 was prepared, and the temperature change (ΔR) of the thermocouple 22 45 seconds after the halogen lamp 20 was turned on was measured. ΔR (A) is the temperature change from room temperature when the aluminum foil is placed as the sample 24, and ΔR (S) is the temperature change from room temperature when the plastic foam is placed as the sample 24. ΔR (S) / ΔR (A) was defined as heat ray reflectivity. The distance between the halogen lamp 20 and the sample 24 was 120 mm, the distance between the sample 24 and the thermocouple 22 was 200 mm, and the incident angle and reflection angle of light in the sample 24 were both 20 degrees.

Example 1
A PES film (Sumilite FS-1300 manufactured by Sumitomo Bakelite Co., Ltd., 250 μm thickness, ρs = 1.37) was put in a pressure vessel, pressurized with carbon dioxide gas to 17 MPa at 17 ° C., and carbon dioxide gas was infiltrated into the film. The penetration time of carbon dioxide gas into the film was 20 hours. Next, the film was taken out from the pressure vessel and put into a hot air circulating foaming furnace set at 140 ° C. for 1 minute to foam. The evaluation results of the obtained foam are shown in Table 1.

(Example 2)
The same PES film as in Example 1 was put in a pressure vessel, pressurized to 7 MPa at 17 ° C. with carbon dioxide, and carbon dioxide was permeated into the film. The penetration time of carbon dioxide gas into the film was 20 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 170 ° C. for 1 minute for foaming. The evaluation results of the obtained foam are shown in Table 1.

(Example 3)
The same PES film as in Example 1 was put in a pressure vessel, pressurized to 4 MPa with carbon dioxide gas at 17 ° C., and carbon dioxide gas was permeated into the film. The penetration time of carbon dioxide gas into the film was 20 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 120 ° C. for 1 minute to foam. The evaluation results of the obtained foam are shown in Table 1.

Example 4
The same PES film as in Example 1 was put in a pressure vessel, pressurized to 1.2 MPa with carbon dioxide at −30 ° C., and carbon dioxide was permeated into the film. The penetration time of carbon dioxide gas into the film was 20 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 170 ° C. for 1 minute for foaming. The evaluation results of the obtained foam are shown in Table 1.

(Example 5)
The same PES film as in Example 1 was put in a pressure vessel, pressurized to 7 MPa at 17 ° C. with carbon dioxide, and carbon dioxide was permeated into the film. The penetration time of carbon dioxide gas into the film was 20 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 125 ° C. for 1 minute for foaming. The evaluation results of the obtained foam are shown in Table 1.

(Example 6)
A PEI film (Sumilite FS-1400 manufactured by Sumitomo Bakelite Co., Ltd., 250 μm thickness, ρs = 1.27) was put in a pressure vessel, pressurized to 1.2 MPa at −30 ° C. with carbon dioxide, and carbon dioxide was permeated into the film. The carbon dioxide gas permeation time into the film was 80 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 200 ° C. for 1 minute for foaming. The evaluation results of the obtained foam are shown in Table 1.

(Example 7)
A PSU film (Sumilite FS-1200, 250 μm thickness, ρs = 1.24, manufactured by Sumitomo Bakelite Co., Ltd.) was placed in a pressure vessel, pressurized to 1.2 MPa at −30 ° C. with carbon dioxide, and carbon dioxide was infiltrated into the film. The carbon dioxide gas permeation time into the film was 80 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 150 ° C. for 1 minute for foaming. The evaluation results of the obtained foam are shown in Table 1.

(Comparative Example 1)
MCPET (registered trademark, manufactured by Furukawa Electric Co., Ltd., 800 μm thickness) was used as a sample. The evaluation results are shown in Table 2.

(Comparative Example 2)
Using PEN (polyethylene naphthalate, Teonex TN8065S manufactured by Teijin Chemicals Ltd.) as a raw material, a film having a thickness of 200 μm was obtained by hot press molding. This was put into a hot-air circulating foaming furnace set at 220 ° C. for 10 minutes for complete crystallization. The evaluation results of the obtained film are shown in Table 2.

(Comparative Example 3)
The same PES film as in Example 1 was put in a pressure vessel, pressurized to 2 MPa at 17 ° C. with carbon dioxide, and carbon dioxide was permeated into the film. The penetration time of carbon dioxide gas into the film was 20 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 200 ° C. for 30 seconds to be foamed. The evaluation results of the obtained foam are shown in Table 2.

(Comparative Example 4)
An aluminum foil (Glory's home master aluminum foil, 15 μm thick) was used as a sample. The evaluation results are shown in Table 2.

(Comparative Example 5)
The PES film which is the foam raw material of Example 1 was used as a sample. The evaluation results are shown in Table 2.

(Comparative Example 6)
The same PES film as in Example 1 was put in a pressure vessel, pressurized to 7 MPa at 17 ° C. with carbon dioxide, and carbon dioxide was permeated into the film. The penetration time of carbon dioxide gas into the film was 20 hours. Next, the film was taken out from the pressure vessel and put into a hot-air circulating foaming furnace set at 125 ° C. for 1 minute for foaming. The evaluation results of the obtained foam are shown in Table 2.

(Comparative Example 7)
Copy paper (My Recycle Paper 100 manufactured by NBS Ricoh Company, 100 μm thickness) was used as a sample. The evaluation results are shown in Table 2.

(Comparative Example 8)
A kitchen sponge (Sumitomo 3M Scotch Bright, 8 mm thickness) was used as a sample. The evaluation results are shown in Table 2.

(Example 8)
As shown in FIG. 3, a photographic reflex plate was produced by attaching a support bar 32 to the heat ray transmitting visible light reflector 31 produced in Example 1.

Example 9
As shown in FIG. 4, the heat transmissive visible light reflector 31 produced in Example 1 is used as a reflector of a light bulb 35, and a metal casing 34 with a heat sink 33 attached to the back side of the reflector is arranged to provide a lighting fixture. Was made.

(Example 10)
As shown in FIG. 5, the heat ray transmitting reflection plate 31 produced in Example 1 is used as a reflection plate of the LED 36, and a metal housing 34 with a heat sink 33 attached to the back side of the reflection plate is used to provide an automobile headlight. Produced.

(Example 11)
As shown in FIG. 6, the liquid crystal television which used the heat ray transmission visible light reflector 31 produced in Example 1 for the reflecting plate was produced. In FIG. 6, 37 is a liquid crystal television casing, 38 is a cold cathode tube, 39 is a liquid crystal panel, and 40 is an optical film.

(Example 12)
As shown in FIG. 7, a solar light intake type indoor lighting system was manufactured by arranging a light guide tube 43 obtained by processing the heat ray transmitting visible light reflector manufactured in Example 1 into a cylindrical shape on the attic. In FIG. 7, reference numeral 41 denotes a sunlight intake window, and 42 denotes an indoor sunlight outlet.

It is a schematic diagram which shows the measuring system of heat ray transmittance. It is a schematic diagram which shows the measurement system of a heat ray reflectivity. FIG. 10 is a schematic diagram showing a photographic reflex plate of Example 8. It is a schematic diagram which shows the lighting fixture of Example 9. FIG. 10 is a schematic diagram showing an automotive headlight of Example 10. 10 is a schematic diagram showing a cross section of a liquid crystal television of Example 11. FIG. It is a schematic diagram which shows the sunlight intake type indoor lighting system of Example 12.

Explanation of symbols

10 Halogen lamp 12 Thermocouple 14 Sample 20 Halogen lamp 22 Thermocouple 24 Sample 31 Heat ray transmitting visible light reflector 32 Support rod 33 Heat sink 34 Metal housing 35 Light bulb 36 LED and its circuit board 37 LCD TV housing 38 Cold cathode tube 39 Liquid crystal panel 40 Optical film 41 Sunlight intake window 42 Indoor sunlight outlet 43 Light guide tube (cylinder made of heat ray transmitting visible light reflector)

Claims (12)

  Made of plastic foam, the total reflectance A of visible light with a wavelength of 550 nm is 30% or more, and the difference BC between the heat ray transmittance B with a wavelength of 1200 nm and the visible light transmittance C with a wavelength of 550 nm is 15% or more. A heat ray transmitting visible light reflector characterized by being.   The heat ray transmitting visible light reflector according to claim 1, wherein the porosity is 0.08 or more.   The heat ray transmitting visible light reflector according to claim 1 or 2, wherein the plastic foam is a foam of an amorphous resin.   The heat ray transmitting visible light reflector according to any one of claims 1 to 3, wherein an average bubble diameter is 100 nm or less.   From the step of holding the raw material resin sheet in a pressurized inert gas atmosphere and containing the inert gas in the raw material resin sheet, and the step of heating and foaming the raw material resin sheet containing the inert gas under normal pressure The heat ray transmitting visible light reflector according to any one of claims 1 to 4, wherein the heat ray transmitting visible light reflector is manufactured by the manufacturing method.   6. A lighting device comprising the heat ray transmitting visible light reflector according to claim 1 as a reflector. A refracting plate for photography, comprising the heat ray transmitting visible light reflector according to any one of claims 1 to 5.   A liquid crystal display device using the heat ray transmitting visible light reflector according to claim 1 as a reflector.   Indoor lighting using sunlight, wherein the heat ray transmitting visible light reflector according to any one of claims 1 to 5 is used as a light guide.   A greenhouse using the heat ray transmitting visible light reflector according to any one of claims 1 to 5 as a wall material.   A blindfold window material comprising the heat ray transmitting visible light reflector according to any one of claims 1 to 5. A blindfold window material, wherein the heat ray transmitting visible light reflector according to any one of claims 1 to 5 is attached to a substrate.

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