JP2010217607A - Luminous sheet and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the visibility of a design by white color in the daytime at 10 mcd/m<SP>2</SP>(luminance enabling clear recognition in darkness) in light emission of 12 hours (all night light emission). <P>SOLUTION: This luminous sheet includes a white reflection layer formed by centrifugal molding while heating a first mixture produced by mixing white pigment into resin material. A second mixture produced by mixing a white luminous material and high luminance luminous material having a specific gravity larger than that of the resin material is injected into the resin material, and they are centrifugally molded while heating on the white reflection layer side. A high luminance luminous material layer, a white luminous material layer, and a transparent protective layer are integrally formed from the white reflection layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a phosphorescent sheet such as a guide sign board for indoor use, a safety sign board for a subway or an underground parking lot, a safety guidance display board, and the like, and a method for manufacturing the same.

Conventionally, for evacuation guide signs for indoor use, a guide light is generally installed, and measures are taken for 20 minutes by an internal battery in the event of a power failure such as a fire or an earthquake.
However, in large-scale factories, large stores, and underground malls, it is assumed that it is difficult for everyone to evacuate in 20 minutes.
Also, since it is necessary to keep the evacuation guide sign on all the time, even if it is a 15W guide light per unit, if 100 units are installed (the Fire Service Act obliges to install them at entrances, corridors, stairs, evacuation routes, etc. There are about 130,000 kw / year (15 w / unit × 24 hours 365 days × 100 units = 13.14 million kw / year).

For this reason, from the viewpoint of energy saving (shift to a low-carbon society), a phosphorescent evacuation guidance sign that does not consume energy and emits light in the dark has been proposed.
Certainly, the phosphorescent evacuation guidance sign stores the light energy of indoor lights and sunlight and emits light in the dark, so there is no energy cost and maintenance-free (no need for periodic replacement of fluorescent lights and batteries like guide lights) There are some advantages.
Therefore, a conventional phosphorescent evacuation guidance sign is composed of a transparent protective layer, a phosphorescent layer, and a white reflective layer. The transparent protective layer is subjected to a design (printing the design and a printed sheet is attached), and the white reflective layer is an adhesive layer ( (For sticking) is provided. (Patent Documents 1, 2, 3)

However, conventionally, it has not been possible to produce a high-luminance, long-light-emitting and white phosphorescent sheet required for phosphorescent evacuation guidance signs.
This is because the phosphorescent material with the highest brightness and long light emission is aluminate-based, the color is light yellow to yellow, the particle size of the phosphorescent material is 100 μm or more (100 to 300 μm), and the amount of phosphorescent material is 800 gr. / M ² or more (800 to 4000 gr / m ² ) has the highest luminance and long light emission, but could not be molded by the method of the above prior art (the above-mentioned Patent Document 3).
That is, since the above prior art is a method of applying or laminating a phosphorescent-containing coating material to a resin sheet, it is difficult to make the phosphorescent material have a particle size of 100 μm or more and to apply a phosphorescent material application amount of 300 gr / m ² or more. Because it was.

Attempts to increase the thickness of the laminate by repeating the coating by the conventional method caused a problem that unevenness and unevenness were generated on the sheet, resulting in no product.
Moreover, in order to produce a white phosphorescent sheet, a white phosphorescent material must be used, but since a white phosphorescent material is made by mixing a white pigment with an aluminate phosphorescent material, a light yellow to yellow phosphorescent material is used. Luminance decreased compared to the material, and therefore the phosphorescent sheet using this white phosphorescent material could not meet the requirements for phosphorescent evacuation guidance signs.

In this type of conventional phosphorescent evacuation guidance sign, further improvements have been desired for the following points.
That is, in the high luminance phosphorescent evacuation signs, but clearly visible in 10mcd / ^{m 2} (darkness emission 12 hours (overnight emission) is (1) emitting 9mcd / ^{m 2} at 10 hours (Japanese Patent No. 4130939) (Brightness), and (2) daylight visibility because the design (logo, letters of emergency exits, etc.) is green because the color of the phosphorescent material used for phosphorescent evacuation guidance signs is yellow and pale yellow Improve the bad point (whiten).

Japanese Patent No. 4130939 JP 2000-256586 A JP 2001-249615 A

The present invention has been made in view of the circumstances as described above, and has a light emission of 10 mcd / m ² (luminance that can be clearly seen in the darkness) with 12 hours of light emission (all night light emission). An object of the present invention is to provide a phosphorescent sheet and a method for producing the same.

In order to achieve the above object, in the phosphorescent sheet according to the present invention, the white reflective layer formed by centrifugally molding while heating the first mixture in which the white pigment is mixed with the resin material, and the white reflective On the layer, by injecting a second mixture obtained by mixing a white phosphorescent material and a high luminance phosphorescent material having a specific gravity greater than that of the resin material into the resin material, from the white reflective layer side by centrifugal molding while heating, A high-luminance phosphorescent material layer, a white phosphorescent material layer, and a transparent protective layer are integrally formed.

In the method for producing a phosphorescent sheet according to the present invention, the first step of forming a white reflective layer by pouring a material in which a white pigment is mixed into a resin material into the inner surface of a centrifugal molding drum, and then the resin material A white phosphorescent material and a high-luminance phosphorescent material are mixed into the inner peripheral surface of the white reflective layer, and centrifugally molded while being heated. And a second step of integrally forming the material layer and the transparent protective layer.

The present invention has the following effects.
According to the phosphorescent sheet of the first aspect of the present invention, it is 10 mcd / m ² (luminance that can be clearly seen in the darkness) in 12 hours of light emission (all night light emission), and the design can be enhanced by white in the daytime. is there.

According to the phosphorescent sheet of the invention described in claim 2, the phosphorescent layer can be whitened while exhibiting high luminance.
According to the phosphorescent sheet of the invention described in claim 3, it is easy to mold and good product performance can be obtained.

According to the phosphorescent sheet of the invention described in claim 4, a product capable of whitening the phosphorescent layer while exhibiting high luminance can be easily molded by centrifugal molding.
According to the method for producing a phosphorescent sheet of the invention according to claim 5, a flat product can be easily obtained.

According to the method for producing a phosphorescent sheet according to the sixth aspect of the present invention, the phosphorescent sheet can be easily separated into two layers of a white phosphorescent material layer and a high luminance phosphorescent material layer by a centrifugal molding method.
According to the manufacturing method of the phosphorescent sheet of the invention of claim 7, the white reflective layer and the phosphorescent material layer can be firmly integrated without using an adhesive.

It is a schematic sectional drawing which shows the phosphorescent sheet which concerns on the Example of this invention. It is the figure which expanded and showed only the luminous material layer and transparent protective layer of FIG.

Hereinafter, the best mode for carrying out the present invention will be described.
The best mode for carrying out the invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a schematic cross-sectional view showing a phosphorescent sheet according to an embodiment of the present invention.
FIG. 2 is an enlarged view of only the phosphorescent layer and the transparent protective layer of FIG.

The phosphorescent sheet of the present invention includes a white reflective layer 3 formed by centrifugal molding while heating a first mixture obtained by mixing a white pigment in a resin material, and a resin material as a resin material on the white reflective layer 3. Injecting a second mixture obtained by mixing a white phosphorescent material 212 and a high-intensity phosphorescent material 222 having a greater specific gravity than the white reflective layer 3 side by injecting a second mixture, and heating the mixture, the high-intensity phosphorescent material layer 22, The white phosphorescent material layer 21 and the transparent protective layer 1 are integrally formed.

As shown in FIG. 2, in this white phosphorescent material layer 21, a white phosphorescent material 212 made of an aluminate phosphorescent material having a particle size of 5 to 100 μm is dispersed in a thermosetting non-yellowing transparent polyurethane material. The high-luminance phosphorescent material layer 22 is a mode in which a high-luminance phosphorescent material 222 made of an aluminate-based phosphorescent material having a particle size of 100 to 300 μm is dispersed in a thermosetting non-yellowing transparent polyurethane material.

Furthermore, although not shown in the drawing, on the transparent protective layer 1, a film printed with a design or a printed film is attached, and the phosphorescent sheet of the present invention is attached to the wall or the like on the back surface of the white reflective layer 3. An adhesive layer is provided.
The white phosphorescent material layer 21 appears white when viewed from directly above in the figure because the white phosphorescent material 212 made of an aluminate-based phosphorescent material of 5 to 100 μm is dispersed.
And since the color of the design is usually green, it is possible to improve the visibility in the daytime compared with the conventional phosphorescent evacuation guidance sign.

Moreover, since the high-intensity phosphorescent material layer 22 is a mode in which the high-intensity phosphorescent material 222 made of an aluminate-based phosphorescent material having a particle size of 100 to 300 μm is dispersed in the thermosetting non-yellowing transparent polyurethane material. Although it is light yellow to yellow, the emission luminance of 10 mcd / m ² or more can be secured in 12 hours (all night) of light emission.
This utilizes the fact that the high-intensity phosphorescent material 222 stores light in the ultraviolet region as energy and emits visible light in the dark.
That is, since the high-intensity phosphorescent material 222 has a characteristic of storing ultraviolet rays having a short wavelength as energy, the ultraviolet rays are not obstructed by the white phosphorescent material layer 21 from the light entering from the transparent protective layer 1 side. The high-intensity phosphorescent material 222 is easily reached and becomes an energy source for the high-intensity phosphorescent material 222.

On the other hand, most of the visible light entering from the transparent protective layer 1 side is reflected by the white phosphorescent material 212 of the white phosphorescent material layer 21, so that the entire phosphorescent sheet appears white.
Further, in the dark, 450 to 550 nm (emission peak) of blue visible light is emitted from the high-intensity phosphorescent material 222. Since the visible light is a short wavelength region, the white phosphorescent material layer Good light emission is possible without being obstructed by 21 (not easily concealed by an obstacle).

In addition, the light reflected by the white reflective layer 3 during light emission can further improve the light luminance.
Generally, the light emission luminance of 20 to 40% can be improved by emitting the light emitted from the high-intensity phosphorescent material 222 of the high-intensity phosphorescent material layer 22 as reflected light.
Furthermore, in the phosphorescent sheet of the present invention, since the white reflective layer 3 and the phosphorescent layer 2 are formed by integral molding, light is not absorbed between the layers.

In general, when materials between layers are different, light is absorbed between the layers, and light becomes thermal energy, so that the light luminance is lowered.
Subsequently, the manufacturing method of the luminous sheet | seat which concerns on a present Example is demonstrated.

The manufacturing method of the luminous sheet | seat which concerns on a present Example uses the centrifugal molding method heated and rotated, and uses the urethane material as a thermosetting resin. Then, a phosphorescent pigment having a specific gravity greater than that of the urethane material is mixed with polyurethane, and a phosphorescent layer containing the phosphorescent pigment and a transparent protective layer containing almost no phosphorescent pigment are formed by utilizing a specific gravity difference by a centrifugal forming method.
The phosphorescent layer and the transparent protective layer are injected and centrifugally molded from the time when the white reflective layer of the mixture with the urethane material containing the white pigment starts to harden until it completely hardens. .

Here, the time until completely cured means the time until there is no unreacted reactive group. The urethane material of this example is a cast urethane material, which is a polyurethane formed by a reaction between a main material having a reactive group (—NCO) called a prepolymer and a curing agent (amine type).

In the urethane material constituting the first mixture, the main material and the curing agent are mixed, injected, and then cured, but the second mixture is present while there are unreacted reactive groups. Is injected, the unreacted reactive groups of the first mixture (molded product) react with the second mixture.
Thereby, the molded object which the molded object shape | molded from the 1st mixture and the 2nd mixture were integrated will be shape | molded.

Hereinafter, the manufacturing method of a luminescent product is demonstrated concretely.

(Process 1)
Add 100 parts of amine-based crosslinking agent and 5 parts of titanium oxide pigment as a white pigment to 100 parts of thermosetting non-yellowing transparent urethane prepolymer, and put into a centrifugal molding machine with a mold temperature of 90-110 ° C., 800-1500 rpm To form a white reflective layer 3.

(Process 2)
Then, the white reflective layer 3 is in a semi-cured state (the thermosetting non-yellowing transparent urethane reactive group remains, but the cured state does not mix even when the next material is added), and the following materials are charged. .
100 parts of thermosetting non-yellowing transparent urethane prepolymer, 40 parts of amine crosslinking agent, white phosphorescent material having an average particle size of 30 μm (5 to 80 μm) (specific gravity 3.4 to 3.6 with aluminate phosphorescent material) 5 parts, 100 parts of high-intensity phosphorescent material having an average particle size of 150 μm (100 to 300 μm) (specific gravity 3.5 to 3.7 with aluminate-based phosphorescent material) and 0.01 part of reaction accelerator (amine system) (promotion of reaction) The agent is a mixed material whose input is changed in a timely manner depending on the viscosity at the time of mixing the materials.

The mold temperature at this time is 90 to 110 ° C., and the rotational speed of the centrifugal molding machine is 50 to 200 rpm.
The material viscosity is adjusted to the viscosity at the time of charging by changing the amount of the reaction accelerator so that the viscosity becomes 100 to 500 mPa · s at the time of charging.
As a result, the thickness of the white reflective layer 3 is equal to or thicker than the thickness of the transparent protective layer 1.
Usually, the thickness of the white reflective layer 3 is 0.2 to 0.5 mm, and the thickness of the transparent protective layer 1 is 0.1 to 0.4 mm.

The molded product is white when viewed from the upper side of the figure, is irradiated with strong light (strong light of 10001x or more) from the lower side of the figure, and becomes a slightly yellow phosphorescent sheet when viewed from the upper side of the figure.
After the molded product taken out from the centrifugal drum is cut, the cut product is sandwiched between flat plates and heat treated at 100 ° C. for 10 hours.

Next, a design (logo, character, etc.) is applied on the transparent protective layer 1 by printing.
Moreover, since the surface of the white reflective layer 3 became a mold surface of a centrifugal molding machine, it was sufficiently degreased to form an adhesive layer with a double-sided tape.

When the phosphorescent evacuation guide sign is screwed to the wall, it is not necessary to provide an adhesive layer.
Furthermore, it can be set as the product which improved the function by attaching a photocatalyst to the outer surface on the design side (antifouling process).

The above-mentioned invention can be used as a guide sign for a factory or a large store as well as used for an indoor guide sign board, a safety sign board or a safety guidance display board in a subway or underground parking lot.
Moreover, it can be used for a guidance sign, a guide sign, etc. for outdoor use.

DESCRIPTION OF SYMBOLS 1 Transparent protective layer 2 Phosphorescent layer 3 White reflection layer 21 White luminous material layer 22 High-intensity luminous material layer 212 White luminous material 222 High-intensity luminous material

Claims (7)

  A white reflective layer (3) formed by subjecting a first mixture obtained by mixing a white pigment to a resin material to centrifugal molding while heating, and the specific gravity of the resin material on the white reflective layer (3) is higher than that of the resin material. A high-intensity phosphorescent material is injected from the white reflective layer (3) side by injecting a second mixture obtained by mixing a white phosphorescent material (212) having a large particle size and a high-intensity phosphorescent material (222) and performing centrifugal molding while heating. A phosphorescent sheet, wherein the material layer (22), the white phosphorescent material layer (21), and the transparent protective layer (1) are integrally formed.   The white phosphorescent material layer (21) is an aluminate phosphorescent material (212) having a particle size of 5 to 100 μm, and the high luminance phosphorescent material layer (22) is an aluminate phosphorescent material (222) having a particle size of 100 to 300 μm. The phosphorescent sheet according to claim 1, comprising:   The phosphorescent sheet according to claim 1 or 2, wherein the resin material is a thermosetting non-yellowing transparent polyurethane.   A first step of forming a white reflective layer (3) by pouring a material in which a white pigment is mixed with a resin material into the inner surface of the centrifugal molding drum, followed by a white phosphorescent material (212) and a high luminance phosphorescent material ( 222) is poured into the inner peripheral surface of the white reflective layer (3) and is subjected to centrifugal molding while being heated, so that the high-intensity phosphorescent material layer (22), from the white reflective layer (3) side, A method for producing a phosphorescent sheet, comprising: a second step of integrally molding the white phosphorescent material layer (21) and the transparent protective layer (1).   5. The method for producing a phosphorescent sheet according to claim 4, wherein after the molded product taken out from the centrifugal molding drum is cut, the cut product is sandwiched between flat plates and subjected to heat treatment for a predetermined time.   The phosphorescent sheet according to claim 4 or 5, wherein the high-intensity phosphorescent material (222) has a higher specific gravity than the white phosphorescent material (212).   The phosphorescent sheet according to claim 4, wherein the second step starts in an uncured state in which unreacted functional groups remain in the white reflective layer (3) formed in the first step. Production method.

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