JP2001049249A - Porous luminescent material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a luminescent material reduced in a decrease in adsorption rate, reduced in the color absorption of a phosphor, and improved in luminous efficiency by adding an emulsion containing a white pigment and a phosphorescent pigment to a porous substance. SOLUTION: The porous substance used is not particularly limited as far as it is one having adsorptivity and is exemplified by active carbon. The phosphorescent pigment is exemplified by an oxoacid salt type phosphorescent pigment and is desirably one having a particle diameter of 0.5-30 μm. The white pigment is a white powder (e.g. kaolin) with which the porous substance can be coated. The polymeric substance used in forming the emulsion is desirably a synthetic rubber one. To obtain a luminescent material, an emulsion containing a white pigment is prepared, and this emulsion is added to a porous substance. In the formation, 1-100 pts.wt. obtained white composition is used per 100 pts.wt. porous substance. This is dried (the amount of the added white pigment is 5-30%). Next, an emulsion containing a phosphorescent pigment is added to the dried product (the amount of the added phosphorescent pigment is 5-30%).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a porous luminous body and a method for producing the same. More specifically, the present invention relates to a porous luminous body composed of a porous substance containing at least a luminous pigment and a white pigment, and a method for producing a porous luminous body in which an emulsion containing a white pigment and a luminous pigment is attached to the porous substance.

[0002]

[Prior art]

2. Description of the Related Art In recent years, with the diversification of living environments, odors such as ammonia, mercaptan, and aldehyde often occur from toilets and domestic wastewater. Although these odors are trace amounts, they drift in the living space, causing unpleasant odors, and of course, environmental pollution by harmful substances contained in the odors is becoming a serious problem. Deodorizers are generally used to remove odors and maintain a comfortable living environment.Activated carbon is a porous non-polar adsorbent and has excellent adsorption of almost all odorous gases. It is heavily used.

[0003] On the other hand, it is true that activated carbon is limited in its use range because it is black. For example, there are many cases where activated carbon is marketed in a plastic case having a lattice window in a non-woven bag. . From the viewpoint of the adsorption capacity of activated carbon, use in such a shielded state reduces the adsorption capacity of activated carbon itself, which is not desirable.

Until now, as a measure for improving the black image of activated carbon, for example, Japanese Patent Laid-Open No. 2-80313 discloses a method in which latex or emulsion is adhered to the surface of activated carbon.
A method is known in which a colored staple fiber having a short fiber length is sprinkled thereon and attached to the surface of activated carbon for coloring. Japanese Patent Application Laid-Open No. 4-256436 discloses a colored activated carbon in which a coloring agent is attached to white activated carbon in which an emulsion containing titanium dioxide is attached to activated carbon.

As described above, by coloring activated carbon, the image of black activated carbon can be improved to some extent. However, if activated carbon is provided with a light-emitting function, its use can be further expanded. A phosphorescent pigment is an example of a material having a light-emitting function, and is used in various fields. For example, it can be applied to the clock face to make it easier to see even in dark places,
It is used in products that can be mixed with resin and molded, and used for products that can ensure visibility even in a dark place by emitting light once stored, such as the terminal part of a power cord for fluorescent lamps.

An example in which such a luminous pigment is used in combination with an adsorbent is disclosed in JP-A-8-266902. However,
The composition disclosed herein is a composition using a photocatalyst comprising a photoreactive semiconductor, a carrier, and a luminous pigment, and is not intended for light emission, and thus has low visibility. Further, since a photocatalyst is used, the organic binder is deteriorated, and it is difficult to fix the luminous pigment to the adsorbent for a long time. Therefore, an object of the present invention is to provide a porous luminous body which has a small decrease in adsorption ability, reduces the color absorption of a luminous agent, and has improved luminous efficiency.

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies on a porous substance which has a small decrease in the adsorbing ability and has an excellent luminous function, and covers the porous substance with a white pigment to radiate light from the luminous agent. It has been found that the absorption of light to be performed is suppressed, and a porous luminescent material suitable for the above purpose can be obtained. That is, the present invention is a porous luminous body composed of a porous substance containing at least a luminous pigment and a white pigment. Another invention of the present invention is a method for producing a porous luminous body, wherein an emulsion containing a white pigment and a luminous pigment is attached to a porous substance.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The porous luminous body of the present invention can be obtained by adding a phosphorescent pigment and a white pigment to a porous substance.
The porous substance is not particularly limited as long as it has adsorptive properties. Activated carbon, activated carbon fiber, alumina, silica gel, zeolite, ceramics, activated clay, unglazed pottery, ion exchange resin, water absorbing resin, silica-zinc type An adsorbent, a titanium-based adsorbent, or the like can be used. Examples of the phosphorescent pigments include oxyacid phosphorescent pigments, sulfide phosphorescent pigments, and alumina oxide phosphorescent pigments. These pigments may be used alone or in combination of two or more. The particle size of the luminous pigment is preferably 0.5 μm to 30 μm, more preferably 1 μm to 20 μm, from the viewpoint of light emission and dispersibility.

In the present invention, as described above, the greatest feature is to use a white pigment. By covering the porous substance with such a white pigment, the luminous efficiency can be increased. Such a white pigment is not particularly limited as long as it can cover the porous substance with a white powder such as kaolin, titanium dioxide, and alumina, but a pigment having no photocatalytic function is preferable. In this respect, kaolin is an example of a preferable white pigment, and the binder used for producing the porous luminescent material of the present invention is hardly deteriorated.

The porous luminous body of the present invention can be produced by impregnating a porous substance with an emulsion liquid containing a white pigment and a luminous pigment. The emulsion referred to in the present invention is a liquid in which a high molecular substance is stably dispersed in an aqueous phase, and exhibits high adhesiveness due to evaporation of the aqueous phase. In order to produce the porous luminescent material of the present invention, it is preferable to use an emulsion having such properties.

Examples of the polymer substance include vinyl acetate-based, acrylic-based, synthetic rubber-based, vinylidene chloride-based, vinyl chloride-based compounds and copolymers thereof. When the dispersoid is a synthetic rubber-based polymer compound, it is usually called a latex.The latex has high adhesiveness, and the dispersion is stable even if the average particle size of the polymer substance that is the dispersoid becomes large. Even when applied to the surface of a porous substance, the degree of clogging of pores is small, so that it is suitable as an emulsion used in the present invention.

In order to obtain the porous luminous body of the present invention, it is necessary to first make the surface of the porous substance white. For this purpose, an emulsion liquid containing a white pigment such as kaolin, titanium dioxide or alumina is used. It is necessary to prepare and impregnate the liquid with a porous material. The liquid is preferably 1 to 100 parts by weight of an emulsion (solid content of a high molecular substance) and 0 to 200 parts of water and 0 to 20 parts of a thickener and the like, and the mixture is sufficiently stirred. This is a composition ratio in which 100 parts are added and uniformly dispersed.

In order to firmly adhere to the surface of the porous material,
For example, the white composition is uniformly sprinkled on a porous material, mixed well, and uniformly adhered to the surface. At this time, the white compositions 1 to 10 were added to 100 parts by weight of the porous substance.
When used in an amount of 0 parts by weight, moisture is easily absorbed into the porous material, so that the surface is exposed during mixing of the porous material, so that they do not adhere to each other, which is preferable. . By drying this, a white porous substance is obtained. The amount of the white pigment to be added is preferably 5 to 30% in terms of the solid content after drying, and more preferably about 20%.

A porous luminous body can be obtained by preparing an emulsion liquid containing a phosphorescent pigment such as an oxyacid-based, sulfide-based or alumina oxide-based substance on the obtained white porous substance and impregnating the liquid. . The composition ratio of the liquid is preferably
1 to 100 parts by weight of the emulsion (polymer solid content) and 0 to 200 parts of water were added to carboxymethyl cellulose (C
After adding 0 to 20 parts of a thickener such as MC) and sufficiently stirring, 1 to 100 parts of a luminous pigment was added and uniformly dispersed. To attach the phosphorescent pigment to the white porous material,
When the emulsion liquid containing the luminous pigment is used in an amount of 1 to 100 parts by weight with respect to 100 parts by weight of the white porous substance, moisture is easily absorbed inside the porous substance, so that the porous substance is mixed. It is preferable that the surface is in a dry state in the meantime so that they do not adhere to each other. By drying this, a porous luminous body is obtained. The amount of the phosphorescent pigment to be applied is preferably 5 to 30%, more preferably about 20%, in terms of solid content after drying.

By simultaneously adding a luminous pigment together with a white pigment such as kaolin to the emulsion, a porous luminescent material can be obtained in one operation.
It is preferable to apply an emulsion containing a white pigment to the porous substance, and then apply a luminous pigment so that the color can be more clearly formed.

The porous luminous body prepared according to the above-mentioned formulation can be used for various purposes by carrying a volatile agent, allowing it to stand in a dark place, and utilizing its sustained release. For example, ddT
By carrying a drug having an insecticidal effect using 80-praletrin (pyrethroid type) or the like as an active ingredient, the insecticidal effect can be enhanced by utilizing the habit of insects such as moths gathering in light. Further, a vermin repellent such as vermethrin or date may be carried and used. In this case, the luminous body can be used as a substitute for lighting, and can be easily introduced into a dark place. In addition, by carrying an inducer such as hydramethylnon in a dark place such as at night to attract pests such as cockroaches, and by utilizing luminous properties, the location of the pests can be clarified even in dark places, and pest control Can be performed accurately. In addition, by carrying a fragrance, it can be used as a sustained-release agent having an interior effect by utilizing a light emitting effect due to luminous properties. Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited thereto.

[0017]

Example 1 15 parts by weight of kaolin per 100 parts by weight of activated carbon (Kuraray Chemical Co., Ltd., activated carbon, Kuraray Coal 3GG)
Acrylic emulsion (total solids 45%, average particle size 0.11 μm, Tg-15 ° C) 10 parts by weight, 3% CMC
A white composition in which 2 parts by weight and 25 parts by weight of water were uniformly dispersed was prepared, and the activated carbon was sprinkled little by little so as to be uniform while being well stirred. After thorough mixing until the water was well absorbed by the activated carbon, the activated carbon was dried at a temperature of 120 ° C. for 3 hours and taken out after the surface became smooth. The activated carbon was colored vivid white, and did not fade when touched by hand.

With respect to 100 parts by weight of the obtained white activated carbon,
15 parts by weight of a pale yellow zinc sulfide phosphorescent pigment which is a sulfide phosphorescent pigment composed of ZnS / Cu having an average particle diameter of 20 μm,
10 parts by weight of an acrylic emulsion solid content (45%),
2 parts by weight of 3% CMC and 25 parts by weight of water were sprinkled little by little so as to be uniform. Table 1 shows the results of measuring the amount of benzene adsorbed on the activated carbon before and after coloring according to JIS K 1474. Almost no decrease in the amount of adsorption was observed.
The luminous body produced in Example 1 was left under a fluorescent lamp for 5 minutes in a dark room, and the fluorescent lamp was turned off. The light emission of the luminous agent could be visually recognized in the dark room.

Example 2 15 parts by weight of the same kaolin as in Example 1, 15 parts by weight of the same luminous pigment as in Example 1, and the same acrylic resin as in Example 1 with respect to 100 parts by weight of the same activated carbon used in Example 1 10 parts by weight of the emulsion, 2 parts by weight of 3% CMC and 25 parts by weight of water were sprinkled little by little so as to be uniform. Table 1 shows the results of benzene adsorption before and after coloring measured in accordance with JIS K1474. Almost no decrease in the amount of adsorption was observed. After the luminous body produced in this example was left under a fluorescent lamp for 5 minutes in a dark room, the fluorescent lamp was turned off. Light emission could be visually recognized in a dark room, but the brightness was lower than in Example 1.

Comparative Example 1 100 parts by weight of activated carbon (Kuraray Chemical Co., Ltd., activated carbon, Kuraray Coal 3GG) was used and Z having an average particle size of 20 μm was used.
A composition is prepared by uniformly dispersing 15 parts by weight of a light yellow zinc sulfide phosphorescent pigment composed of nS / Cu, 10 parts by weight of an acrylic emulsion (solid content: 45%), 2 parts by weight of 3% CMC, and 25 parts by weight of water. Then, sprinkle the activated carbon little by little so that it becomes even while stirring well. After the water has been mixed well enough to be absorbed by the activated carbon and the surface has become dry, the attached activated carbon is dried in a dryer at a temperature of 120 ° C. for 3 hours.
After drying for an hour, it was taken out. When the benzene adsorption amount of the activated carbon before and after coloring was measured, as shown in Table 1,
Although almost no decrease in the amount of adsorption was observed, the luminous body was left under a fluorescent lamp for 5 minutes in a dark room to turn off the fluorescent lamp, and the luminescence of the luminous agent was visually observed in the dark room. Could not confirm.

[0021]

[Table 1]

Example 3 5 g of a luminous body obtained in the same manner as in Example 1 was added to dd-T8
0.5 g of an insecticide containing 0-praletrin (pyrethroid) as an active ingredient was impregnated and arranged in a petri dish. The petri dish was left in a dark room of 1 m ³ in which a fluorescent lamp was installed, and the fluorescent lamp was turned on for 5 minutes. Immediately after the lights were turned off, 10 moths were introduced into the dark room, and after 5 minutes, the number of moths dropped on the floor of the dark room was counted. The same test was repeated five times. Table 2 shows the results
Shown in The luminescent material obtained in the same manner as in Comparative Example 1 was similarly impregnated with an insecticide and tested in the same manner. The first test: one, the second test: 3, the third test: two, the fourth test: 1
5th test: 2 animals.

[0023]

[Table 2]

[0024]

According to the present invention, a porous luminous body comprising a porous substance containing a luminous pigment and a white pigment can be provided. The porous luminous body of the present invention is an adsorbent having a high interior effect, utilizing a luminescence and sustained release function, by supporting a drug having an insecticidal effect and allowing it to stand in a dark place,
It exerts an insecticidal effect on moths and the like that gather in light and can be suitably used.

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Claims (5)

[Claims] 1. A porous luminous body comprising a porous substance containing at least a luminous pigment and a white pigment. 2. A porous luminous body comprising the porous luminous body according to claim 1 carrying a volatile agent. 3. The porous luminous body according to claim 2, wherein said drug is a drug having an insecticidal effect. 4. A method for producing a porous luminous body, wherein an emulsion containing a white pigment and a luminous pigment is attached to a porous substance. 5. The method for producing a porous luminous body according to claim 4, wherein an emulsion containing a white pigment is applied to the porous substance, and then a luminous pigment is applied.