JP4130151B2 - Luminescent molded body and method for producing the same - Google Patents

Description

【００３５】
実施例、比較例いずれについても、照明下において木目模様は明瞭に表現されており、外観はそれ程変わりなく見えるが、実施例１〜３については、比較例と較べ触感に僅かにざらつきが感じられ、蓄光顔料が表面付近に配向されていることが感じられる。
【００３６】
これらの実施例及び比較例に係わる成形品の、外観及び暗所における発光の度合いを目視にて確認している。暗所における発光の確認は、予め４０Ｗの蛍光灯で２ｍの高さから３０分間、光を照射した後、暗所に移動させて行っている。発光の確認については、暗所への移動後、１０分〜１８０分に亘って行い、発光の持続性を確認している。その結果を表２に示す。
【００３７】
【表２】

【００３８】
発光の持続性の評価において、ベースペレットと模様ペレットとのメルトインデックスが比較的大きい実施例１〜３については、初期の発光輝度及び発光の持続性は蓄光顔料の含有量が多くなるにつれ優れたものとなっている。対して、ベースペレットと模様ペレットとのメルトインデックスの差が比較的小さい比較例については、実施例２より多くの割合の蓄光顔料が配合されているにも関わらず、実施例３と同程度の発光の持続性であり、本発明により得られる効果が明確に顕わされている。
【００３９】
【発明の効果】
本発明によれば、外部層に被着された内部層の面が光反射面となされていることで、外部層に配合された蓄光性蛍光物質により発せられた光線が透光性の熱可塑性合成樹脂中を透過して外部に放出され、夜間においても成形体は発光するが、内部層側に発光された光線が、反射面となされた内部層の表面により反射されて外部に放出されることで、外部に放出される光線量を増加させることで十分な発光輝度を得ることができる。
【図面の簡単な説明】
【図１】 本発明に係わる実施の一形態を示す説明図である。
【図２】 図１のＡ−Ａ断面における外部層の詳細を示す断面図である。
【図３】 図１のＡ−Ａ断面における外部層の詳細を示す断面図である。
【図４】 本発明の押出成形に係わる溶融樹脂の、流速の相違を示す説明図である。
【図５】 本発明に係わる他の実施形態を示す説明図である。
【図６】 本発明に係わる更に他の実施形態を示す説明図である。
【図７】 図６のＢ−Ｂ断面における外部層の詳細を示す断面図である。
【符号の説明】
１ 外部層
１１ 透光性の熱可塑性樹脂
２ 内部層
２１ 光反射層
３ 蓄光性蛍光物質
１０ 蓄光性成形体
Ｐ 管材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to handrails and floorboards for corridors, stairs, bathrooms, etc. indoors, outdoor handrails, fences, terraces, balconies, restaurants, etc., park playground equipment, boardwalks, ponds, spring water, etc. It is related with the molded object replaced with the natural wood used for the above.
[0002]
[Prior art]
Conventionally, for things that need to show its presence at night, such as handrails in hallways and stairs, etc., it is molded by blending phosphorescent fluorescent pigments, or the molded products are attached to some parts, etc. Many techniques for emitting light have been disclosed.
[0003]
For example, a handrail is disclosed in which a handrail made of a synthetic resin is coated with a nightlight pigment obtained by kneading a nightlight pigment before molding. (For example, Japanese Utility Model Publication No. 61-69334)
[0004]
Further, a hard foamed vinyl chloride resin layer is coated on the outer surface of the hollow aluminum, and a non-foamed resin layer having a wood grain pattern is formed on the outer surface of the hard foamed vinyl chloride resin layer, and a fluorescent pigment is formed on the non-foamed resin layer. Or the composite material containing the luminous pigment is disclosed. (For example, registered utility model No. 3013744)
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 61-69334 [0006]
[Patent Document 2]
Registered Utility Model No. 3013744 [0007]
[Problems to be solved by the invention]
However, nocturnal pigments such as fluorescent pigments and phosphorescent pigments absorb light energy in the ultraviolet region from the surroundings and emit light having a frequency lower than the absorbed energy. If it does not sufficiently enter the phosphorescent pigment or the like, there is a fear that desired light emission luminance and light emission persistence cannot be obtained at night. In particular, the persistence of light emission is an indispensable characteristic for ensuring safety when used for indoor handrails and outdoor fences.
[0008]
In the handrails and composite materials described in Patent Document 1 and Patent Document 2, most of the blended fluorescent pigments and phosphorescent pigments do not contribute to light emission except those present as a result in the vicinity of the surface. Therefore, in order to obtain sufficient light emission luminance and light emission sustainability, a very large amount of a fluorescent pigment, a phosphorescent pigment, or the like is required. Further, in Patent Document 2, there is a possibility that dark portions related to the formation of a wood grain pattern may cause light emission.
[0009]
The present invention has been made in view of the above-described problems, and a phosphorescent molded article capable of obtaining sufficient emission luminance in a dark place without blending an excessive amount of a fluorescent pigment, a phosphorescent pigment or the like. Is intended to provide.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration. That is, the phosphorescent molded body according to the present invention, the outer layer to the inner layer is deposited, the phosphorescent material is incorporated in the outer layer, the outer layer is phosphorescent light-transmitting thermoplastic synthetic resin A phosphor material is blended and molded, and the inner layer has at least a surface on which the outer layer is deposited, and a light reflecting surface that reflects light emitted from the phosphorescent phosphor material toward the inner layer toward the outside. The outer layer is formed of a thermoplastic synthetic resin in which a luminous fluorescent substance is blended, with a melt index smaller than that of the translucent thermoplastic synthetic resin and a dark color. By extruding the blend containing the pellets on the inner layer, the phosphorescent fluorescent material is oriented near the surface of the outer layer and moved away from the surface of the outer layer. Expressed It is characterized in that the so that.
[0011]
According to the present invention, the surface of the inner layer attached to the outer layer is a light reflecting surface, so that the light emitted from the phosphorescent phosphor compounded in the outer layer is translucent thermoplastic. Although it passes through the synthetic resin and is emitted to the outside, the molded product emits light even at night, but the light emitted to the inner layer side is reflected by the surface of the inner layer that is the reflecting surface and emitted to the outside. Thus, sufficient light emission luminance can be obtained by increasing the amount of light emitted to the outside.
[0012]
Further, it is preferable that the phosphorescent fluorescent material is a phosphorescent fluorescent pigment and the outer layer is colored with the phosphorescent fluorescent pigment because the amount of the pigment for coloring the phosphorescent molded body can be reduced.
[0013]
Further, the outer layer is formed by blending dark pellets with the light-transmitting thermoplastic synthetic resin to express wood grain, and the dark pellets are formed of the light-transmitting heat If the melt index is made smaller than that of the plastic synthetic resin and the phosphorescent fluorescent material is oriented near the surface of the outer layer, the phosphorescent fluorescent pigment is excessively oriented because the phosphorescent fluorescent pigment is oriented near the surface. Sufficient emission luminance can be obtained without blending. In addition, the dark pellets expressing the grain do not hinder phosphorescence and light emission. Furthermore, by using a light-transmitting thermoplastic synthetic resin, even when the luminous brightness at night is sufficient, the wood grain is clearly expressed within the bright, and the design as a molded body that expresses the wood grain may be impaired. Absent.
[0014]
Further, as described above, if the light reflection surface is a color surface whose brightness is in the range of L value 70 or more, the light emitted to the inner layer side is reflected by the surface of the inner layer as the reflection surface as described above. The luminous intensity can be increased by increasing the amount of light emitted to the outside, but the surface of the color whose brightness is in the range of L value 70 or more is particularly easy to reflect ultraviolet rays and excites the phosphorescent phosphor. Ultraviolet rays such as sunlight can be reflected on the surface of the inner layer and incident on the phosphorescent fluorescent material, and energy relating to light emission in the phosphorescent fluorescent material is efficiently accumulated, which is preferable.
[0015]
Furthermore, it is preferable that the light reflecting surface is a total reflecting surface because the effect is enhanced to the maximum with respect to both the improvement of light emission luminance and the efficiency of energy storage related to light storage.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 shows an embodiment according to the present invention, in which a molded body is used as a handrail member, (a) is a handrail member, and (b) is an explanatory view showing a use state as a handrail. . In A), the handrail member 10A as the molded body 10 is formed by integrally forming the outer layer 1 and the inner layer 2 at the same time, and is provided with an opening edge 10A1 below. The thicknesses of the outer layer 1 and the inner layer 2 may be appropriately set according to the use. However, considering the moldability and use as a handrail member, the outer layer 1 is 0.3 to 1.0 mm, and the inner layer 2 Is preferably about 0.5 to 5.0 mm.
[0017]
(B), the handrail member 10A is fitted to the core member 10A3 from the opening edge 10A1, and is formed on the handrail member 10A. By fitting the stopper 10A2, the handrail member 10A is attached while preventing the handrail member 10A from rotating on the core member 10A3.
[0018]
FIG. 2 is a cross-sectional view showing details of the outer layer 1 in the AA cross section of FIG. The outer layer 1 formed on the outer side of the inner layer 2 is formed by blending a luminous fluorescent material 3 with a translucent thermoplastic synthetic resin 11. When the surroundings become dark, the phosphorescent phosphor 3 emits light using the stored energy, but the light emitted from the phosphorescent phosphor 3 has no directivity and is emitted toward the entire periphery. At that time, the light beam L1 going to the outside passes through the light-transmitting thermoplastic synthetic resin 11 of the outer layer 1 and is emitted toward the outside, but the light beam L2 emitted toward the inner layer 2 is emitted to the outer layer. Since the surface to which 1 is attached is the light reflecting surface 21, it is reflected by the light reflecting surface 21 and radiated outward.
[0019]
In the daytime, as shown in FIG. 3, external light is transmitted through the light-transmitting thermoplastic synthetic resin 11 and irradiated onto the phosphorescent phosphor material 3, so that the outside of the phosphorescent phosphor material 3 becomes dark. The energy for emitting light is stored. Here, the surface of the inner layer 2 to which the outer layer 1 is applied is a light reflecting surface 21, so that the luminous phosphor material 3 has a light-transmitting thermoplasticity in addition to the light beam L4 incident directly from the outside. The light beam L5 that has passed through the resin 11 is reflected by the light reflecting surface 21, enters as the light beam L6, and the energy accumulated in the phosphorescent phosphor 3 increases, so that the light emission luminance and the light emission persistence are enhanced.
[0020]
The light reflection layer 21 formed on the surface of the inner layer 2 on which the outer layer 1 is applied is made of a metal, synthetic resin or the like with a smooth surface, glass beads attached or embedded, and a prism reflector. It may be formed, or may be formed by depositing a metal film such as aluminum, chromium, silver, etc. on the surface by vapor deposition, sputtering, etc. However, it is easy to make the surface of a color whose brightness is in the range of L value 70 or more. A light reflecting surface 21 can be formed on the surface of the inner layer 2. Further, if the lightness is white or an approximate color to an L value of 100, the reflection efficiency of ultraviolet rays can be increased, the amount of reflected light L6 can be increased, and the energy stored in the phosphorescent phosphor 3 can be further increased. . Further, if the light reflection layer 21 is a total reflection surface with a metal surface as a mirror surface, the effect can be maximized with respect to both improvement of light emission luminance and efficiency of energy storage related to light storage.
[0021]
The phosphorescent phosphor 3 contained in the outer layer 1 may be a sulfide type material such as zinc sulfide or copper blended therein, but an oxide such as aluminum oxide, boron oxide, or strontium oxide may be used. Oxidizing compounds mainly composed of rare earth such as europume are preferred because they have advantages in safety, chemical stability, heat resistance, length of light emission time, and the like. In particular, aluminate-based strontium-based phosphorescent phosphors can be suitably used because of their long emission brightness and emission time. When the phosphorescent phosphor material is blended in an amount of about 10 to 20 parts by weight with respect to 100 parts by weight of the thermoplastic synthetic resin, sufficient luminous brightness can be obtained without adversely affecting the moldability.
[0022]
The light-transmitting thermoplastic resin 11 forming the outer layer 1 is polyethylene, polypropylene, polystyrene, acrylic resin, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate. Polyphenylene sulfide, polyamide, polyurethane, elastomer, natural rubber, derivatives thereof, and the like, which are transparent or translucent and translucent, may be appropriately used depending on molding conditions and uses of molded products.
[0023]
Further, if the handrail member 10A according to the present embodiment has a Shore hardness of 60 or less, it becomes easy to bend and feels slippery and familiar to the hand, and the core material 10A3 and the handrail member 10A are separated. In the case where the handrail member 10A is subsequently covered on the core material 10A3, the handrail member 10A is flexibly bent and easily covered. The Shore hardness is a value measured by a D type of a Shore hardness tester.
[0024]
Further, the outer layer 1 is formed by blending dark pellets with the light-transmitting thermoplastic synthetic resin 11 to express the grain, and the dark pellets are light-transmitting thermoplastic. If the melt index is smaller than that of the synthetic resin 11, the phosphorescent phosphor 3 is oriented near the surface of the outer layer 1.
[0025]
When performing extrusion molding using a thermoplastic synthetic resin, the resin in a molten state generally flows at a flow rate as shown in FIG. 4 inside the mold. In molding, the molten resin R is extruded in a state where pressure is applied to the mold K, but the Reynolds number is extremely large near the interface F where the molten resin R and the mold K are in contact with each other. Turbulence occurs and the flow velocity decreases. As shown in the flow rates S1 to S3, the flow rate increases rapidly as the distance from the interface F increases, and the flow rate increases gradually as the distance from the interface F increases.
[0026]
In extrusion molding, when a plurality of types of thermoplastic synthetic resins having different melt indexes are mixed and not sufficiently compatible, a dark pellet having a poor flow in the molten state, that is, a dark pellet having a low melt index is formed from the interface F. Instead, the light-transmitting thermoplastic synthetic resin having a large melt index is oriented in the vicinity of the surface. By utilizing this difference in flow rate, the phosphorescent phosphor is compounded in a larger proportion in the vicinity of the surface by blending the phosphorescent phosphor with a light-transmitting thermoplastic synthetic resin having a large melt index. It becomes possible.
[0027]
FIG. 5 shows another embodiment according to the present invention, and is an explanatory view showing a wood-like material having a rectangular cross section as a molded body. The wood-like material 10B is as disclosed in Japanese Patent Application Laid-Open No. 2000-301670 by the present applicant, and the outer layer 1 is formed over the entire circumference of the inner layer 2.
[0028]
The wood-like material 10B is installed outdoors, but the synthetic resin is deteriorated by irradiation with ultraviolet rays outdoors. As described above, the phosphorescent fluorescent material emits light by absorbing light energy in the ultraviolet region, and deterioration of the outer layer 1 can be reduced by incorporating the phosphorescent fluorescent material into the outer layer 1. Further, since the phosphorescent fluorescent material is oriented near the surface, it is possible to reduce the deterioration of the dark pellets expressing the grain, and to maintain the color and grain pattern for a long period of time.
[0029]
Furthermore, the outer layer 1 can absorb light in the ultraviolet region even if synthetic resin derived from waste is used to form the inner layer 2 or a large amount of wood flour is blended and the weather resistance is low. Thus, the outer layer 1 having a thinner thickness can prevent the inner layer 2 from being deteriorated, and if the outer layer 1 is thinner, the expression of the grain becomes easier and the cost is further reduced.
[0030]
6 and 7 show still another embodiment according to the present invention and are explanatory views showing a resin-coated tube material as a molded body. First, in FIG. 6, a white paint is applied to the outer surface of the pipe material P to form the inner layer 2, and the outer layer 1 is further adhered to the outer surface to form the resin-coated tube material 10 </ b> C.
[0031]
FIG. 7 is a cross-sectional view showing details of the BB cross section in FIG. 6, and the inner layer 2 formed by the white paint painted on the outer surface of the pipe P is white, so that the surface is particularly treated. The light reflecting surface 21 can be formed without application. When the outer layer 1 is applied to the light reflecting layer 21, the outer layer 1 may be separately extruded and wound as a sheet. However, the outer layer 1 may be extruded into a tube K having the inner layer 2 formed on the outer surface. It is preferable that the outer layer 1 can be easily and reliably formed by coating.
[0032]
Next, examples of the molded body according to the present invention will be described.
The molded products according to the examples and comparative examples are obtained by extrusion molding into the shape shown in FIG. The total thickness of the two layers of the molded product is 3 to 4 mm, and the thickness of the outer layer is 1.0 to 1.2 mm. The inner layer is formed by blending an olefin-based plastomer (manufactured by Dow Chemical Company, PL1880) and an ethylene-vinyl copolymer at a weight ratio of 8: 2. The outer layer is blended as shown in Table 1, and base pellets and pattern pellets are mixed and extruded. The thermoplastic synthetic resin forming the surface layer is a transparent olefin-based elastomer, although the MI is different. The phosphorescent fluorescent material is an aluminate-based strontium-based phosphorescent fluorescent pigment that is yellow-green and also serves as a coloring pigment.
[0033]
Furthermore, the inner layer is blended with a pigment to adjust the lightness L value. In the examples, titanium oxide is blended to make L value 90 white, and in the comparative example, an inorganic pigment is blended to make L value 45 brown. Yes.
[0034]
[Table 1]

[0035]
In both Examples and Comparative Examples, the wood grain pattern is clearly expressed under illumination, and the appearance looks almost the same, but for Examples 1 to 3, a slightly rough feel is felt compared to the Comparative Examples. It is felt that the phosphorescent pigment is oriented near the surface.
[0036]
The appearance and the degree of light emission in the dark place of the molded products according to these examples and comparative examples are visually confirmed. Confirmation of light emission in a dark place is performed by irradiating light from a height of 2 m for 30 minutes in advance with a 40 W fluorescent lamp and then moving to a dark place. About confirmation of light emission, after moving to a dark place, it is performed over 10 minutes-180 minutes, and the persistence of light emission is confirmed. The results are shown in Table 2.
[0037]
[Table 2]

[0038]
In the evaluation of the persistence of light emission, for Examples 1 to 3 in which the melt index between the base pellet and the pattern pellet was relatively large, the initial light emission luminance and the light emission persistence were excellent as the phosphorescent pigment content increased. It has become a thing. On the other hand, for the comparative example in which the difference in melt index between the base pellet and the pattern pellet is relatively small, although the phosphorescent pigment in a larger proportion than that in Example 2 is blended, it is the same level as in Example 3. It is the persistence of light emission, and the effect obtained by the present invention is clearly manifested.
[0039]
【The invention's effect】
According to the present invention, the surface of the inner layer attached to the outer layer is a light reflecting surface, so that the light emitted from the phosphorescent phosphor compounded in the outer layer is translucent thermoplastic. Although it passes through the synthetic resin and is emitted to the outside, the molded product emits light even at night, but the light emitted to the inner layer side is reflected by the surface of the inner layer that is the reflecting surface and emitted to the outside. Thus, sufficient light emission luminance can be obtained by increasing the amount of light emitted to the outside.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment according to the present invention.
FIG. 2 is a cross-sectional view showing details of an outer layer in the AA cross section of FIG. 1;
3 is a cross-sectional view showing details of an outer layer in the AA cross section of FIG. 1. FIG.
FIG. 4 is an explanatory view showing a difference in flow rate of a molten resin related to extrusion molding of the present invention.
FIG. 5 is an explanatory diagram showing another embodiment according to the present invention.
FIG. 6 is an explanatory view showing still another embodiment according to the present invention.
7 is a cross-sectional view showing details of the outer layer in the BB cross section of FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer layer 11 Translucent thermoplastic resin 2 Inner layer 21 Light reflection layer 3 Luminescent fluorescent substance 10 Luminescent molded object P Tube material

Claims (5)

Outer layer is deposited on the inner layer, with phosphorescent material is incorporated in the outer layer, the outer layer is phosphorescent material is molded is formulated translucent thermoplastic synthetic resin, the inner layer At least the surface to which the outer layer is deposited is a method for producing a luminous storage article in which a light reflecting surface that reflects light emitted from the phosphorescent phosphor to the inner layer is reflected to the outside. The outer layer is formed of a thermoplastic synthetic resin containing a phosphorescent phosphor and a compound containing a dark pellet and a melt index smaller than that of the translucent thermoplastic synthetic resin on the inner layer. The phosphorescent material is characterized by aligning the phosphorescent fluorescent material near the surface of the outer layer and extruding the grain with dark pellets that move away from the surface of the outer layer. Molding The method of production. The method for producing a phosphorescent molded article according to claim 1, wherein the phosphorescent fluorescent material is a phosphorescent fluorescent pigment, and the outer layer is colored with the phosphorescent fluorescent pigment. The method for producing a phosphorescent molded article according to claim 1 or 2, wherein the inner layer contains wood powder. The method for producing phosphorescent molding according to any one of claims 1 to 3, wherein the light reflecting surface is a color surface having a lightness in a range of L value 70 or more. A phosphorescent molded article produced by the method for producing a phosphorescent molded article according to any one of claims 1 to 4, wherein the outer layer is deposited on the inner layer, and the phosphorescent phosphor is on the outer layer. In addition, the outer layer is formed by blending a light-transmitting thermoplastic synthetic resin with a phosphorescent fluorescent material, and the inner layer has at least a surface on which the outer layer is adhered, from the phosphorescent fluorescent material. A light reflecting surface that reflects light emitted toward the layer toward the outside is formed, and the outer layer is formed of a thermoplastic synthetic resin in which a phosphorescent fluorescent material is blended and the light-transmitting thermoplastic. A compound having a melt index smaller than that of the synthetic resin and blended with dark colored pellets is extruded on the inner layer, so that the phosphorescent fluorescent material is oriented near the surface of the outer layer and the outer layer. Move away from the surface Phosphorescent molded body, characterized in that the grain is represented by dark-colored pellets.

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