JP6568028B2 - Method for manufacturing phosphorescent display structure - Google Patents

Description

  The present invention relates to a method for manufacturing a phosphorescent display structure.

  As one method of manufacturing a phosphorescent display structure, a phosphorescent material is formed on a substrate (which may be provided with a reflective layer) to form a phosphorescent layer, and a transparent protective material is further applied thereon, A method for forming a transparent protective layer is known. As another method for producing a phosphorescent display structure, there is also known a method in which a phosphorescent sheet and a transparent protective sheet are sequentially bonded to each other with an adhesive to form these layers.

  However, these manufacturing methods have complicated processes. In the case of the above method, it is necessary to dry the applied phosphorescent material and then apply the transparent protective material, or in the latter method, the adhesive is cured. Since time for curing is required, work and time are required.

  Therefore, as a simpler method for manufacturing a phosphorescent display structure, a mixture liquid prepared by mixing phosphorescent material powder with a transparent resin is poured into the concave portion of the substrate, and after the phosphorescent powder is precipitated, the transparent resin is cured. A production method is known in which a phosphorescent layer and a transparent protective layer are produced simultaneously. For example, Patent Document 1 discloses a method for producing a phosphorescent guide sign by pouring a liquid mixture containing a thermosetting resin and a phosphorescent agent into a recess on a substrate and curing the mixture.

JP 2011-017210 A

  However, in recent years, a more compact phosphorescent display structure has been desired as an increase in energy saving and securing an evacuation route in the event of a power failure caused by a disaster. Specifically, there are many things with a small width for attaching the guidance display structure, such as staircase handrails and AEDs (Automated External Deflators), and in particular, staircase handrails are thinned from the viewpoint of safety. Must. However, in the phosphorescent display structure having high emission luminance, it is necessary to mix a large amount of phosphorescent pigment with the resin, and when such pigment is contained in a large amount, the viscosity increases. There is a problem that the phosphorescent display structure cannot be manufactured because the display structure that has been made thin does not spread uniformly. On the other hand, when the phosphorescent pigment is reduced and the viscosity is lowered so that it can be poured uniformly, manufacturing by casting becomes possible, but there is a problem that the emission luminance is remarkably lowered.

  This invention is made | formed in view of the said problem, Comprising: It aims at providing the manufacturing method of the phosphorescent display structure reduced in size or thickness which has high light emission luminance.

  In order to achieve the above object, in the present invention, a phosphorescent display structure characterized in that a resin composition containing a strontium aluminate phosphorescent powder and a thermosetting silicone resin is molded by injection onto a metal frame and then cured. A method for manufacturing a body is provided.

  If it is a manufacturing method of such a luminous storage display structure, a high luminous brightness is obtained by injecting a resin composition containing a luminous pigment (strontium aluminate-based luminous powder) and a thermosetting silicone resin onto a metal frame. A phosphorescent display structure having a small size or a thin shape can be manufactured.

  The thermosetting silicone resin is preferably a phenyl silicone resin.

  If it is a manufacturing method of such a phosphorescent display structure, the phosphorescent display structure excellent in flame retardance can be manufactured.

  Moreover, it is preferable that the said metal frame shall consist of a metal plate in any one of copper, aluminum, and SUS.

  With such a method of manufacturing a phosphorescent display structure, a phosphorescent display structure that is superior in durability can be manufactured.

  In this case, it is preferable that the metal plate is subjected to etching treatment, punching treatment, or both.

  In the method for producing a phosphorescent display structure according to the present invention, the metal plate subjected to the above treatment can be used as a metal frame.

  Moreover, it is preferable that the metal frame is subjected to a plating process.

  With such a method for producing a phosphorescent display structure, it is possible to improve the light extraction efficiency from the phosphorescent pigment, and to provide a phosphorescent display structure that is more excellent in emission luminance.

  Moreover, it is preferable that the metal frame is hardened after being molded by injecting a reflective material composition containing a light reflecting material and a thermosetting silicone resin onto the metal frame.

  With such a method for producing a phosphorescent display structure, it is possible to improve the light extraction efficiency from the phosphorescent pigment, and to provide a phosphorescent display structure that is more excellent in emission luminance.

  In this case, it is preferable that the light reflecting material includes one or more selected from titanium oxide particles, zinc oxide particles, and aluminum oxide particles.

  In the method for producing a phosphorescent display structure of the present invention, it is preferable to use a material containing the above particles as a light reflecting material from the viewpoint of thermal conductivity, light reflectivity, moldability, and flame retardancy.

  By injecting and molding a resin composition obtained by mixing strontium aluminate-based phosphorescent powder and thermosetting silicone resin according to the present invention, phosphorescence can be reduced in size and thickness and has high emission luminance. It is possible to provide a method for manufacturing a display structure. In particular, according to the present invention, even when a resin composition in which phosphorescent pigments are mixed at a high filling rate is used, the resin composition can be uniformly filled in a small or thin metal frame. Therefore, a small or thin phosphorescent display structure having higher light emission luminance can be manufactured.

It is a cross-sectional schematic diagram of the luminous storage display structure in which the reflective layer and the luminous layer were formed on the metal frame. FIG. 5 is a schematic cross-sectional view showing the positional relationship among a lower mold, a metal frame, an upper mold, a filling portion, and a nozzle of an injection molding machine in injection molding.

  Hereinafter, the present invention will be described in more detail.

  As described above, there is a demand for a method for manufacturing a phosphorescent display structure that has high emission luminance and is small or thin.

  The present inventors have intensively studied to achieve the above object. As a result, it has been found that a method for producing a phosphorescent display structure that cures after injecting a resin composition containing a strontium aluminate-based phosphorescent powder and a thermosetting silicone resin into a metal frame, and then curing, The present invention has been completed.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings, but the present invention is not limited thereto.

  First, an example of a phosphorescent display structure manufactured by the method for manufacturing a phosphorescent display structure of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view of a phosphorescent display structure in which a reflective layer and a phosphorescent layer are formed on a metal frame. As shown in FIG. 1, the phosphorescent display structure 10 has a reflective layer 12 formed on the bottom surface of a metal frame 11 and a phosphorescent layer 13 formed on the upper layer of the reflective layer 12. In FIG. 1, the reflective layer 12 is formed in the lowermost layer of the concave portion of the metal frame 11. However, in the method for manufacturing the phosphorescent display structure according to the present invention, this reflective layer is not necessarily formed.

  The method for producing a phosphorescent display structure according to the present invention is a method in which a resin composition containing a phosphorescent powder and a thermosetting silicone resin is injected into a metal frame, molded, and then cured. At that time, by using strontium aluminate-based phosphorescent powder as the phosphorescent powder, it is possible to produce a phosphorescent display structure having high emission luminance and high reliability. Moreover, the resin composition can be uniformly filled in a metal frame that is reduced in size or thickness by injecting and molding the resin composition onto the metal frame. Therefore, according to the present invention, it is possible to manufacture a phosphorescent display structure that is small or thin and has high emission luminance and reliability.

  Hereafter, the manufacturing method of this invention is explained in full detail.

(A) Preparation of Resin Composition The resin composition of the present invention is prepared by mixing a strontium aluminate phosphorescent powder and a thermosetting silicone resin. Although the apparatus used for mixing operation is not specifically limited, A crusher, 3 rolls, a ball mill, a planetary mixer, etc. can be used. Moreover, you may combine these apparatuses suitably.

[Strontium aluminate phosphorescent powder]
Strontium aluminate is a substance having strontium (Sr), aluminum (Al) and oxygen (O) as main constituent elements such as SrAl ₂ O ₄ , Sr ₄ Al ₁₄ O ₂₅ , and strontium aluminate phosphorescent powder is A small amount of europium (Eu), dysprosium (Dy), boron (B) or the like may be added using a strontium aluminate salt as a mother crystal. The phosphorescent material using the strontium aluminate phosphorescent powder has higher emission luminance and longer afterglow time than conventional phosphorescent materials using zinc sulfide as a mother crystal, so in the present invention, strontium aluminate is used as a phosphorescent pigment. Use system powder. In the present invention, by using a strontium aluminate-based phosphorescent powder as a phosphorescent powder to achieve high-luminance emission, it is possible to realize sufficient emission luminance in combination with a thermosetting silicone resin having excellent transparency. Yes.

  The blending amount of the strontium aluminate phosphorescent powder is preferably 50 to 500% by mass, more preferably 50 to 200% by mass, and even more preferably 100 to 200% by mass with respect to the entire cured product after curing. is there. When the blending amount of the phosphorescent powder is 50% by mass or more, the luminance is sufficiently high. In addition, when the blending amount is 500% by mass or less, the viscosity of the resin composition does not become too high, and defects such as clogging occur when the resin composition is injected into a metal frame and molded in (B) molding described later. It becomes difficult to do. By molding a composition containing the strontium aluminate phosphorescent powder in the above range by an injection molding method, a light emitting display device having an effective light emitting ability can be obtained even if the thickness of the cured product is 1 mm or less.

[Thermosetting silicone resin]
The thermosetting silicone resin may be any resin that can be molded in (B) molding described later (for example, a resin that can be injection molded (injection mold) or transfer molded (transfer mold)). It may be liquid or solid, and if it is solid, it can be melted using a heating and mixing device to obtain a viscosity that can be mixed and injected to be molded. From the viewpoint of enhancing the filling property of the thermosetting silicone resin in the narrow portion, the thermosetting silicone resin is preferably a liquid resin at room temperature, and more preferably has a viscosity in the range of 1 to 100 Pa · s at 25 ° C. Resin.

As the thermosetting silicone resin contained in the resin composition, methyl silicone resin, phenyl silicone resin, fluorine-modified silicone resin, organic-modified silicone resin, etc. can be used, and these have excellent transparency characteristics. . The methyl silicone resin refers to a silicone resin having a methyl group (—CH ₃ ) and a refractive index of 1.41. The phenyl silicone resin refers to a silicone resin having a phenyl group bonded to one or more silicon atoms and having a refractive index of 1.42 or more. The fluorine-modified silicone resin has a CF ₃ — (CF ₂ ) _m — (CH ₂ ) _n — group bonded to one or more silicon atoms (where m is an integer of 0 or more, and n is 1). It is an integer above), and indicates a silicone resin having a refractive index of 1.40 or less. The organically modified silicone resin refers to a silicone resin to which an organic group such as an amino group, an epoxy group, or a norbornene group is added.

  In particular, in the present invention, the thermosetting silicone resin contained in the resin composition is also referred to as phenyl silicone resin from the viewpoint of suitably fulfilling the role of protecting the phosphorescent layer in the event of a fire because it has a high oxygen index and is difficult to burn. It is preferable to do. As phenyl silicone resin, Shin-Etsu Chemical Co., Ltd. product name X-32-3360, X-32-3377, etc. can be used, for example.

[filler]
A filler can be added to a resin composition according to a use. Examples of the filler include fine particles such as silica, alumina, zirconia, and titania. Specific examples of the silica include silica produced by a dry method such as fumed silica and fused silica, and silica produced by a wet method such as colloidal silica, sol-gel silica, and precipitated silica. In the case of alumina, an α phase crystal structure is generally used, but an intermediate layer such as a θ phase, a γ phase, and a δ phase may be included.

(B) Molding This step is a step of injecting and molding the resin composition prepared in (A) onto a metal frame. As a molding method, any method may be used as long as it is an injection molding method, and a method such as injection molding or transfer molding can be used. With these methods, the resin composition can be poured into the metal frame under pressure. The molding conditions other than the molding method are not particularly limited, but the temperature is preferably 20 to 200 ° C., more preferably 80 to 160 ° C., and the pressure is preferably 0.1 to 100 MPa, more preferably 0.8. The condition is 5 to 20 MPa.

  Hereinafter, an example of molding will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view showing the positional relationship among the lower mold, metal frame, upper mold, filling portion, and nozzle of the injection molding machine in the molding step (B). FIG. 2 illustrates a case where an injection mold method is used as a molding method. As shown in FIG. 2, a metal frame 21 is fixed to a lower mold 22 having a temperature of 20 to 200 ° C., and is clamped by an upper mold 23 having a temperature of 20 to 200 ° C. Next, the resin composition 26 prepared in the preparation step (A) is injected into the mold through the flow path 24 of the upper mold 23 from the nozzle 25 of the injection molding machine. The injected resin composition 26 is temporarily cured in a mold at 20 to 200 ° C. for 1 to 10 minutes, and then the upper mold 23 and the lower mold 22 are opened to open the metal frame 21 and the resin composition. The molded product in which 26 is integrated is taken out of the mold.

[Metal frame]
The metal frame used in the present invention can be designed freely as long as it has a structure in which the resin composition is blocked at the filling portion at the time of injection and no air residue is generated. Further, the metal frame may be used alone, or a plurality of metal frames may be used in an overlapping manner. For example, a substantially rectangular metal frame having a recess can be used. In this case, the dimension of the concave portion can be, for example, 50 to 80 millimeters in length × 50 to 80 millimeters in width × height (height from the bottom surface of the recess to the peripheral top portion) of 0.5 to 1 millimeter. In this case, the overall size of the metal frame is larger than the size of the recess (for example, the overall size is larger than the size of the recess by about 0.5 to 1 mm in each of the vertical, horizontal, and height directions). It will be a thing. Even if such a small or thin metal frame is used, the resin composition can be uniformly filled in the metal frame according to the present invention.

  Although it does not specifically limit as a kind of metal frame, It is preferable that a metal frame shall consist of either a metal plate of copper, aluminum, and SUS (stainless steel). Thereby, the phosphorescent display structure excellent in durability can be manufactured.

  The metal plate may be subjected to etching treatment, punching treatment, or both, and can be appropriately processed into a desired shape.

  In the present invention, a part of or the entire surface of the metal frame can be plated to produce a phosphorescent display structure with high emission luminance. By performing a metal plating process on the metal frame, the light extraction efficiency from the phosphorescent pigment is improved, and a phosphorescent display structure having better light emission luminance can be provided.

[Metal plating]
As a method for forming metal plating, a roll-to-roll method, a barrel plating method, an electric field plating method, or the like can be used. A sparger method that encloses a mechanical mask made of silicone rubber or the like and sprays a plating solution onto a target portion, a taping method that applies a masking tape to a plating unnecessary portion, or an exposure method that applies a resist may be employed. As the metal used for the plating, known materials can be used, among which silver, gold, palladium, aluminum, nickel, tin, chromium and alloys thereof can be used. Preferably, silver or nickel plating treatment with high light reflectance is performed. The thickness of the metal plating is usually preferably in the range of 50 μm or less, more preferably in the range of 10 μm or less, and further preferably in the range of 1 to 5 μm from the economical viewpoint.

  Furthermore, you may form the coating layer which has a sulfide prevention function on a plating layer. For example, a sulfur-resistant coating agent such as S-Barrier-01 manufactured by Shin-Etsu Chemical Co., Ltd. can be suitably used. Especially when the plating is silver, the light extraction efficiency associated with the blackening of the silver surface by NOx or SOx Can be suppressed.

(C) Curing Next to (B), the resin composition filled in the interior (concave portion) of the metal frame is cured to form a phosphorescent layer that is a cured product of the resin composition inside the metal frame. . Although it does not restrict | limit especially about curing conditions, Usually, it is preferable to set it as the conditions of 60-180 degreeC of curing temperature and 1 to 5 hours of curing time.

  The thermosetting silicone resin of the present invention preferably has a high hardness after curing. It is preferably 60 or more, more preferably 70 or more and 95 or less, and still more preferably 80 or more and 95 or less, based on the type A hardness standard defined in JISK6253. If it is such a hardness range, it will be excellent in the performance which protects a phosphorescent display structure from the impact when an object collides.

  As described above, the phosphorescent display structure in which the phosphorescent layer is formed on the bottom surface of the metal frame can be manufactured. In the present invention, (B) the metal frame used at the time of molding is formed by injecting a reflective material composition containing a light reflecting material and a thermosetting silicone resin into the metal frame, and then curing the metal frame. A phosphorescent display structure in which a reflective layer is formed on the bottom surface of the metal frame and a phosphorescent layer is formed on the reflective layer can be manufactured.

  Providing a phosphorescent display structure with improved light emission efficiency by providing a reflective layer that is a cured product of the reflector composition on the bottom of the metal frame, improving the light extraction efficiency from the phosphorescent pigment It becomes possible to do.

(A) Preparation of reflector composition The reflector composition is prepared by mixing a light reflector and a thermosetting silicone resin. Although the apparatus used for mixing operation is not specifically limited, The thing similar to the apparatus used by preparation of (A) resin composition can be used.

[Light reflecting material (light reflecting material)]
Examples of the light reflecting inorganic particles contained in the light reflecting material used in the present invention include titanium oxide particles, zinc oxide particles, alumina particles, silica particles, magnesium oxide particles, antimony oxide particles, aluminum hydroxide particles, barium sulfate particles, Examples thereof include magnesium carbonate particles, and these may be used alone or in combination. From the viewpoints of thermal conductivity, light reflectivity, moldability, and flame retardancy, titanium oxide particles, zinc oxide particles, alumina particles, silica particles, antimony oxide particles, and aluminum hydroxide particles are preferable, and oxidation is more preferable. Titanium particles. The particle size of the inorganic filler (light-reflective inorganic particles) is not particularly limited, but considering the filling efficiency with the diffusing agent, the fluidity of the thermosetting resin, and the filling property in a narrow portion, it is 100 μm. The following is preferable.

  In addition, reinforcing fillers, pigments, fluorescent substances, and the like can be mixed in the light reflecting material according to other purposes.

[Thermosetting silicone resin]
As the thermosetting silicone resin, the same resin as that used in the preparation of the resin composition (A) can be used. The thermosetting silicone resin contained in the reflective material composition is preferably liquid at room temperature. Examples of the liquid thermosetting silicone resin include methyl silicone resin, phenyl silicone resin, fluorine-modified silicone resin, and organic-modified silicone resin. In particular, in the present invention, the thermosetting silicone resin contained in the reflector composition is preferably a phenyl silicone resin from the viewpoint of suitably fulfilling the role of protecting the phosphorescent layer in a fire because it has a high oxygen index and is difficult to burn. It is preferable to do. As phenyl silicone resin, Shin-Etsu Chemical Co., Ltd. product name X-32-3360, X-32-3377, etc. can be used, for example.

  The mixing ratio of the light reflecting material and the thermosetting silicone resin is usually 1 to 100 parts by weight, preferably 5 to 50 parts by weight, more preferably 10 to 30 parts by weight with respect to the thermosetting silicone resin. .

(B) Molding of reflective material This step is a step of injecting and molding the reflective material composition prepared in (a) onto a metal frame. The molding conditions may be the same as in the molding step (B) above, but the temperature is usually 20 to 200 ° C., preferably 80 to 160 ° C., and the injection pressure is preferably 0.1 to 100 MPa. More preferably, the condition is 0.5 to 20 MPa.

(C) Curing of the reflective material By curing the reflective material composition that is injected and molded into the metal frame, a reflective layer that is a cured product of the reflective material composition is formed inside the metal frame. Although it does not specifically limit as hardening conditions of a reflector composition, Preferably hardening temperature is 100-180 degreeC, and hardening time becomes like this. Preferably it is 3 minutes or more. If it is such a range, when a reflective layer will be uncured and a liquid luminous layer will be inject | emitted, it can avoid mixing a reflective layer and a luminous layer.

EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to a following example. The viscosity is a value at 25 ° C. measured using a rotational viscometer. Luminance is measured using a luminance meter HS-1000T (manufactured by Otsuka Electronics Co., Ltd.). Luminance (mcd / m ² ) after irradiating the phosphorescent display structure with ultraviolet intensity of 400 μW for 60 minutes and leaving it in a dark room for 3 hours. Is a measured value. If the luminance is 10 mcd / m ² or more, the luminance is sufficient, and if it is less than 10 mcd / m ² , the luminance is not sufficient.

[Example 1]
(A) Preparation of resin composition 60 g of strontium aluminate phosphorescent powder (Zetnet, product name Z-B-1000) and thermosetting silicone resin (Shin-Etsu Chemical Co., Ltd., product name X-32-3360) , Phenyl silicone, viscosity 3 Pa · s) was stirred and mixed to prepare a phosphor-containing thermosetting silicone resin composition.

(B) Molding For a copper alloy metal plate with a thickness of 1.0 mm, the size of the recess is 66 mm long × 55 mm wide × height (height from the bottom of the recess to the circumferential top) 0.8 mm. Etching was performed to produce a metal frame having a recess. The metal frame was fixed to a lower mold heated to 150 ° C., and clamped by clamping with an upper mold heated to 150 ° C. Next, the phosphor-containing thermosetting silicone resin composition prepared in the above preparation step was injected from the nozzle of an injection molding machine. The injected resin composition is preliminarily cured by heating at 150 ° C. for 5 minutes in a mold, and then the upper mold and the lower mold are opened, and the metal frame and the phosphor-containing thermosetting silicone resin composition are opened. The molded product integrated with was taken out of the mold.

(C) Curing The obtained molded product is further heated at 150 ° C. for 2 hours to cure the phosphor-containing thermosetting silicone resin composition, and a phosphorescent display structure in which a phosphorescent layer is formed on the bottom surface of the metal frame. Got the body. The phosphorescent display structure molded in this manner was a thermosetting silicone resin composition mixed with a phosphorescent pigment and was molded without any unfilled portions and air remaining. The light emission luminance of the obtained phosphorescent display structure was 30 mcd / m ² , and it was confirmed to have sufficient light emission luminance.

[Example 2]
Phosphorescent display in the same procedure as the manufacturing method of Example 1 except that the same metal frame surface as used in Example 1 was subjected to 1.5 μm-thick silver plating by electroplating. A structure was obtained. The phosphorescent display structure molded in this manner was a thermosetting silicone resin composition mixed with a phosphorescent pigment and was molded without any unfilled portions and air remaining. The luminous intensity of the obtained phosphorescent display structure was 33 mcd / m ² .

[Example 3]
In the manufacturing method of Example 1, the metal frame used in (B) molding is prepared by the above-mentioned (a) preparation of the reflector, (b) molding of the reflector, and (c) curing of the reflector, (B) A phosphorescent display structure was obtained in the same procedure as in Example 1 except that the mold shape of the mold used in the molding was changed.

(A) Preparation of Reflective Material As a reflective material, 13.2 g of titanium oxide particles having a specific gravity of about 4.23 and an average particle diameter of 0.25 μm (product name: rutile type titanium oxide CR-60, manufactured by Ishihara Sangyo Co., Ltd.) and thermosetting. 112.6 g of a functional silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd., product name X-32-3360) was mixed with stirring to prepare a reflector composition.

(B) Molding of reflecting material For a copper alloy metal plate having a thickness of 1.0 mm, the size of the recess is 66 mm long × 55 mm wide × height (height from the bottom of the recess to the top of the periphery) 0.8 mm. Etching was performed to prepare a metal frame having a recess. The metal frame was fixed to a lower mold heated to 150 ° C., and clamped by clamping with an upper mold heated to 150 ° C. The nesting shape of the mold was 66 mm long × 55 mm wide, and the height of the reflector composition after molding was designed to be 0.2 mm. Next, the reflective material mixture (reflective material composition) mixed in the reflective material preparation step was injected from the nozzle of an injection molding machine. The injected reflector composition was temporarily cured by heating at 150 ° C. for 10 minutes in the mold, and then the upper mold and the lower mold were opened to integrate the metal frame and the reflector composition. The molded product was taken out from the mold.

(C) Curing of reflective material The obtained molded product was further heated at 150 ° C. for 1 hour to cure the reflective material composition to prepare a metal frame having a reflective layer.

(A) Preparation of resin composition A phosphorescent-containing thermosetting silicone resin composition was prepared in the same manner as in Example 1 above.

(B) Molding The metal frame having the reflective layer obtained in the above (a) to (c) is fixed to a lower mold heated to 150 ° C., and clamped with an upper mold heated to 150 ° C. It was. At this time, the nesting shape of the mold was changed so that the height of the resin composition after molding was 66 mm × 66 mm × 55 mm. On the reflective layer of the metal frame having the above-mentioned reflective layer, a phosphorescent substance-containing thermosetting silicone resin composition is further injection-molded in the same manner as in Example 1 or 2, and the metal frame, the reflective layer, and the phosphorescent substance-containing thermoset are cured. A molded product in which the silicone resin composition was integrated was obtained.

(C) Curing The phosphorescent material-containing thermosetting silicone resin composition is cured in the same manner as in Example 1 above, a reflection layer is formed on the bottom surface of the metal frame, and a phosphorescence layer is formed on the reflection layer. A display structure was obtained. The phosphorescent display structure molded in this manner was a thermosetting silicone resin composition mixed with a phosphorescent pigment and was molded without any unfilled portions and air remaining. The luminous intensity of the obtained phosphorescent display structure was 36 mcd / m ² .

[Comparative Example 1]
In the molding step (B) of Example 1, injection molding is not performed, the phosphor-containing thermosetting silicone resin composition is poured into a metal frame, heated at 150 ° C. for 5 minutes and temporarily cured, and then further 150 ° C. X It was cured under conditions of 2 hours. The molded product (cured product of resin composition) is not completely wet and spreads unevenly, and the metal frame is exposed and the top of the cured product protrudes from the height of the metal frame recess. A place was seen. The height from the bottom of the recess to the top of the cured product was 3.1 mm. The luminous intensity of the obtained phosphorescent display structure was 30 mcd / m ² where the molded product (cured product of the resin composition) was filled, but the metal frame was partially exposed Was 6 mcd / m ² .

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  According to the present invention, it is possible to provide a method for manufacturing a phosphorescent display structure that is simple and excellent in luminance even for a phosphorescent display structure that is reduced in size and thickness. The phosphorescent display structure obtained by the production method of the present invention can be used for evacuation guidance display using phosphorescence, a signboard, an advertisement, and the like.

10 ... phosphorescent display structure 11, 21 ... metal frame,
12 ... reflective layer, 13 ... phosphorescent layer,
22 ... Lower mold, 23 ... Upper mold, 24 ... Flow path,
25 ... Nozzle, 26 ... Resin composition.

Claims (7)

A resin composition containing a strontium aluminate-based phosphorescent powder and a thermosetting silicone resin has a length of 50 to 80 mm × width of 50 to 80 mm × height (height from the bottom of the recess to the peripheral top) of 0.5 to 1 mm. A method for producing a phosphorescent display structure, comprising: injecting and molding a rectangular metal frame having a plurality of recesses, followed by curing.   The method for producing a phosphorescent display structure according to claim 1, wherein the thermosetting silicone resin is a phenyl silicone resin.   The method for manufacturing a phosphorescent display structure according to claim 1 or 2, wherein the metal frame is made of a metal plate of copper, aluminum, or SUS.   The method for manufacturing a phosphorescent display structure according to claim 3, wherein the metal plate is subjected to an etching process or a punching process, or both.   The method for manufacturing a phosphorescent display structure according to any one of claims 1 to 4, wherein the metal frame is plated.   6. The metal frame according to claim 1, wherein the metal frame is formed by injecting a reflective material composition containing a light reflective material and a thermosetting silicone resin into the metal frame, and then curing the metal frame. A method for producing the phosphorescent display structure according to claim 1.   The method for producing a phosphorescent display structure according to claim 6, wherein the light reflecting material includes one or more selected from titanium oxide particles, zinc oxide particles, and aluminum oxide particles.

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