JPH10102409A - Road, construction material or fluorescent inorganic artificial aggregate for ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide specific water absorptivity, increase emission luminance of fluorescent inorganic artificial aggregate and to promote durability by dispersing and adding particles of an inorganic phosphor and/or a stimulable inorganic phosphor in a ceramic base metal with high light permeability of continuous phases at a specific content. SOLUTION: An inorganic fluirescent body and/or a light storage inorganic fluorescent body is mixed with a ceramic base metal having low melting point for adjusting particle size and high light permeability to obtain inorganic artificial aggregate by melting and burning. The content of the inorganic phosphor and/or the stimulable inorganic phosphor is so set in 3-50wt.% that the artificial aggregate is provided with high emission luminance, mechanical characteristic, durability and medication resistance, it is burnt while controlling burning temperature, and water absorptivity less than 4.0% is provided to cool. A mass or a large-sized chip is ground, and road constituted of only particled bodies exceeding 0.5mm. construction materials or fluorescent artificial aggregate for ship have high emission luminance and elaborate and excellent durability as aggregate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to inorganic artificial aggregates for roads, construction materials or marine vessels having fluorescent properties or luminous fluorescent properties, and in particular, has clear luminous properties, excellent mechanical strength and abrasion resistance. The present invention relates to a fluorescent inorganic artificial aggregate for roads, building materials or ships, which also has water resistance, water resistance, weather resistance and the like.

[0002]

BACKGROUND ART In recent years, the number of traffic accidents has increased due to diversification, mass increase, and overcrowding of traffic. In particular, in the case of accidents occurring at night, the ratio of the number of deaths to the number of accidents is high. How to prevent the occurring accidents has become a major issue in future road safety measures.

[0003] Normally, vehicles running at night have their headlights turned on, but nevertheless, the visibility for the driver is significantly reduced, and the field of view is limited to a very narrow range. In addition, obstacles and road-related facilities that do not emit light by themselves are very difficult to find. Therefore,
It is considered that the occurrence of serious accidents at night increases due to the combination of such various adverse conditions.

[0004] Therefore, in order to prevent the occurrence of traffic accidents at night, installation of road lighting, installation of lane markings and gaze guides, lightening of pavement, and improvement of visibility by a retroreflector using glass beads. And other measures are in progress.

In recent years, there has been a movement to improve visibility by using a fluorescent material or a phosphorescent fluorescent material. Thus, these fluorescent materials and phosphorescent fluorescent materials are generally used in the form of paints and the like because they are easily hydrolyzed as they are and have poor durability such as poor light resistance. Then, the use of a plate material or the like using this fluorescent material or a phosphorescent fluorescent material as a gaze guide or the like has begun to be performed. Artificial aggregates made of resin mixed with a fluorescent material or a luminous fluorescent material have also been used. However, artificial artificial aggregates made of a resin mixed with a fluorescent material or a luminous fluorescent material have been used. However, it has been difficult to apply it to applications requiring particularly high durability, such as the surface of a road floor, because of its insufficient durability such as light resistance, weather resistance, and abrasion resistance.

[0006] In addition, the artificial aggregate using such a resin as a base material can be used not only as an aggregate for roads but also as an aggregate for building materials or aggregates for ships. Even in such a case, the light resistance, weather resistance, abrasion resistance and the like are insufficient, and problems such as poor durability and easy hydrolysis are caused.

As described above, in the case of a conventional resin-based fluorescent artificial aggregate using a fluorescent material or a phosphorescent fluorescent material, various characteristics required as a road aggregate, a building aggregate, or a ship aggregate are required. At the same time and could not be fully satisfied.

[0008]

The present invention has been made in view of the above circumstances, and an object of the present invention is to use, instead of using resin as a base material for aggregate, light transmittance, particularly After using an inorganic material having a high transmittance of ultraviolet rays and mixing it with a phosphor and / or a phosphorescent phosphor, the obtained mixture is melted and sintered to be suitably used depending on the application. With excellent performance to obtain,
An object of the present invention is to provide a fluorescent inorganic artificial aggregate for roads, building materials or ships, which has high luminous intensity and excellent durability such as weather resistance and abrasion resistance.

[0009]

The present inventors have conducted intensive studies in order to solve such technical problems, and as a result, have found that the transmittance of visible light and ultraviolet light is high and that a predetermined ratio is contained in a ceramic base material forming a continuous phase. Aggregate obtained by dispersing and containing the inorganic phosphor and / or the phosphorescent phosphor of the above, which has a dense structure, has a high luminous intensity, and has excellent durability such as weather resistance and abrasion resistance. The present invention has been found to be suitable as a fluorescent inorganic artificial aggregate for roads, building materials or ships, and has completed the present invention.

[0010] That is, the present invention provides a granular material obtained by dispersing and containing particles such as crystal grains of an inorganic phosphor and / or a phosphorescent inorganic phosphor in a ceramic matrix having a high translucency which forms a continuous phase. And the content of the inorganic phosphor and / or the phosphorescent inorganic phosphor in the granular material is 3 to 50% by weight, and the water absorption is 4.0% or less. And a fluorescent inorganic artificial aggregate for marine use.

As described above, in the road, building material or marine fluorescent inorganic artificial aggregate according to the present invention, the ceramic material is used as the base material, whereas the inorganic fluorescent material and / or the phosphorescent material are used. Since the inorganic phosphor is dispersed and contained, the inorganic phosphor and the phosphorescent inorganic phosphor that are easily hydrolyzed and oxidized as they are are advantageously protected by the ceramic material, and the emission luminance is thereby improved. Can be effectively suppressed. In addition, since such ceramic materials are made of a material having a high light transmittance that does not hinder the transmission of visible light or ultraviolet light, the dispersed or contained inorganic phosphor or phosphorescent inorganic phosphor is used. The light emission characteristics of the above can be effectively exhibited. Further, in the road, building material or marine fluorescent inorganic artificial aggregate according to the present invention, the water absorption is set to 4.0% or less, but when the water absorption is low, The porosity is also reduced, and the oxidation and hydrolysis of the inorganic phosphor and the phosphorescent inorganic phosphor are advantageously suppressed, and excellent durability is exhibited.

Further, according to one preferred embodiment of the fluorescent inorganic artificial aggregate for roads, building materials or ships according to the present invention, the granular material comprises particles of the inorganic fluorescent material and / or phosphorescent inorganic fluorescent material. And crushing a lump or large chip obtained by melting or firing the ceramic base material,
It has a size of 0.5 mm or more obtained by sieving and is substantially free from fine particles less than 0.5 mm. Usually, as the particle size decreases, the specific surface area increases. However, the inorganic phosphor and / or the phosphorescent inorganic phosphor particles dispersed and contained in the ceramic base material are thereby increased. , And easily exposed to the surface of the granular material (artificial aggregate). Then, the phosphor exposed on the surface of the granular material is easily oxidized or hydrolyzed, so that the emission luminance is significantly reduced. In short, in the case of a granular material that is a fine powder having a particle size of less than 0.5 mm, the emission luminance is significantly impaired. Therefore, in the inorganic artificial aggregate according to the present invention, the granular material constituting the inorganic artificial aggregate is set to have a size of 0.5 mm or more, and the granular material is configured not to include fine particles of less than 0.5 mm. By
Aggregate particles having reduced light emission luminance can be effectively reduced, and excellent light emission characteristics can be exhibited.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The fluorescent inorganic artificial aggregate for roads, building materials and ships according to the present invention is composed of an inorganic ceramic base material having particles of appropriate size, an inorganic phosphor and / or an inorganic fluorescent material. Or a mixture of a luminous inorganic phosphor and a mixture obtained by melting and firing. Among them, as the inorganic phosphor or the luminous inorganic phosphor, conventionally known various ones, for example, Sulfide-based phosphors, halophosphate-based phosphors, phosphate-based phosphors, silicate-based phosphors, tungstate-based phosphors, aluminate-based phosphors, etc., are in the form of fine particles such as crystal grains. Will be used. The inorganic phosphor referred to in the present invention emits fluorescence only when light is emitted from a light source, and emits afterglow (phosphorescence) at all after the irradiation of light is stopped. Examples of such inorganic phosphors include calcium halophosphate-based phosphors, strontium / magnesium phosphate-based phosphors, and barium / magnesium aluminate-based phosphors. Body and the like. On the other hand, the phosphorescent inorganic phosphor referred to in the present invention is one that not only emits fluorescence when light is emitted from a light source but also emits afterglow (phosphorescence) even after the irradiation of light is stopped. Specific examples of such a phosphorescent inorganic phosphor include a zinc sulfide-based phosphor, a strontium aluminate-based phosphor, a calcium aluminate-based phosphor, and a barium aluminate-based phosphor. .

As such an inorganic phosphor or a phosphorescent inorganic phosphor, it is desirable to employ one that is stable at high temperatures and has good oxidation resistance. The reason is that since the artificial aggregate according to the present invention is obtained by firing at a high temperature, it must be prevented from being decomposed during firing. These inorganic phosphors or phosphorescent inorganic phosphors can be used singly or in combination. For example, by combining a phosphorescent inorganic phosphor and an inorganic phosphor, it is possible to obtain an inorganic aggregate having higher emission luminance of phosphorescence and phosphorescence and a longer phosphorescence emission time.

Further, an activator or a co-activator may be added to the inorganic phosphor and the phosphorescent inorganic phosphor as required. These activators and co-activators are added to change the emission characteristics of the phosphor such as emission luminance and emission wavelength. And specific examples of such an activator include europium, manganese, barium, tin, calcium and the like.

On the other hand, the inorganic ceramic base material used in the present invention constitutes a main component of the obtained inorganic artificial aggregate and has an action of protecting the inorganic phosphor and / or the phosphorescent inorganic phosphor. Things,
As such a ceramic base material, conventionally known various materials can be used, but those which can be melted at a low temperature are preferably employed, and generally have a low melting point of 1000 ° C or less, preferably 900 ° C or less. It is desirable that a ceramic matrix be employed. Usually, the phosphor is 800-1200 ° C., excluding aluminate-based phosphor and silicate-based phosphor fired at a high temperature of 1300 ° C.
This is because, in many cases, the ceramic base material is melted before the temperature reaches the firing temperature, and a protective layer surrounding the phosphor should be formed.

Further, when the ceramic base material is lead oxide (Pb)
O) and other heavy metal oxides, Fe, Cr, Ni, Co,
When a transition metal such as Cu is contained, the action of the activator or co-activator is adversely affected, and as a result, the fluorescent properties of the phosphor are reduced or discoloration is caused. However, even if it is contained as an impurity, it is important to minimize it.

These low-melting ceramic base materials are usually composed of a refractory raw material for imparting fire resistance to the ceramic base material and a low-flammable raw material for lowering the melting point of the obtained ceramic base material. As refractory raw materials, SiO ₂ such as silica stone and silica sand and a small amount of alumina (Al ₂
O ₃ ) may be used, and the added amount of alumina is preferably 10% or less. In addition, as a low-flammable raw material,
Alkali metal oxides such as Li ₂ O, Na ₂ O, and K ₂ O;
Alkaline earth metal oxides such as CaO, MgO, SrO,
ZnO, B ₂ O ₃ or the like can be mainly used. More specifically, boric acid and borax can be used as the B ₂ O ₃ , and lithium carbonate, soda ash, chile saltpeter, saltpeter, potassium carbonate, and feldspar group are used as alkali metal oxides. Can be done. Further, as the alkaline earth metal oxide, limestone, magnesium carbonate,
Magnesia, strontium carbonate or the like can be used, and zinc oxide or the like can be used as ZnO. It should be noted that the raw material of the ceramic base material is not limited to those exemplified above, and it is a matter of course that various raw materials can be used. Then, after the various raw materials are pulverized and mixed, they are melted to obtain uniform glassy ceramics or frit-like ceramics.

Further, the ceramic base material is required to have high light transmittance so as not to hinder the emission characteristics of the inorganic phosphor and / or the phosphorescent inorganic phosphor. Desirably, it is at least translucent. On the other hand, TiO ₂ , ZrO ₂ , SnO ₂
Milky materials such as, the higher the content, from the point of reducing the light transmittance of the resulting ceramic base material,
It is desirable that the content is controlled to be at most 5% by weight or less. If a large amount of Al ₂ O ₃ is contained, the light transmittance is reduced and the luminous property of the fluorescent aggregate is reduced.
It is preferred that less is added.

The ceramic base material as described above is
After adjusting the particle size using appropriate means such as pulverization, the mixture is mixed with a phosphor that has been pulverized to an appropriate particle size such that the emission characteristics are also good, and the resulting mixture is used as it is or by granulation molding. After that, by firing at a temperature around the melting point of the ceramic base material, a fluorescent inorganic artificial aggregate is obtained.

The content of the inorganic phosphor and / or the phosphorescent inorganic phosphor in the obtained fluorescent inorganic artificial aggregate is determined by the high light emission luminance, mechanical properties, durability and chemical resistance of the target aggregate. In order to impart the content, the content is 3 to 50% by weight, preferably 5 to 35% by weight. If the content of the phosphor is less than 3% by weight, the desired emission luminance cannot be obtained, and if the content of the phosphor is more than 50% by weight, the emission luminance is saturated. In addition to the fact that the emission luminance does not increase further, it is uneconomical, and in addition to the fact that the absolute amount of the ceramic base material that wraps the phosphor and forms the protective layer is insufficient, water and light Or, due to external environmental factors such as oxygen or the like, the phosphor is easily oxidized and decomposed and hydrolyzed, and as a result, the emission luminance and the durability are easily decreased.

The firing temperature is generally preferably in the range of 750 to 900 ° C. since a protective layer of a ceramic base material should be formed on the phosphor before the phosphor is decomposed. At a temperature within such a range, the light-emitting device is appropriately managed so as to have an appropriate emission luminance and an appropriate water absorption.

The water absorption of the fluorescent inorganic artificial aggregate according to the present invention obtained by such a firing operation is as follows:
It is set to 4.0% or less, preferably 2.0% or less. This is because if the water absorption is higher than 4.0%, the durability of the aggregate starts to decrease, which is not preferable.

Further, the atmosphere at the time of firing can be appropriately selected so as not to impair the luminous characteristics of the obtained fluorescent inorganic artificial aggregate. For example, a protective layer made of a ceramic base material can be formed on the phosphor successfully. In the case where it is performed, it may be fired in a normal atmosphere in which oxygen is present, for example, in the air, but there is no problem. Is preferably fired in an inert atmosphere such as nitrogen or argon, or in a weakly reducing atmosphere containing a small amount of hydrogen.

When the fluorescent inorganic artificial aggregate according to the present invention is obtained, a mixture of a phosphor and a ceramic matrix is granulated to a given particle size and then fired.
Alternatively, it is desirable to employ a method in which the obtained mixture is melted, discharged and cut from an orifice or the like, granulated to a given particle size, and then molded. Since the surface of the obtained fluorescent inorganic artificial aggregate is covered with the ceramic base material, the phosphor contained therein is isolated from the outside, thereby causing hydrolysis and oxidative decomposition. It is difficult and the durability can be greatly improved,
This is because the decrease in emission luminance of fluorescence or phosphorescence is reduced.

On the other hand, in a method of mixing a phosphor and a ceramic base material, melting, calcining, and crushing and sieving the cooled mass or large chip to obtain an aggregate having a predetermined particle size. Since the phosphor is exposed at the fracture surface during pulverization, hydrolysis and oxidative decomposition are more likely to occur as the phosphor content increases. In particular, as the particle size becomes smaller, the specific surface area increases, so that this tendency becomes remarkable. Further, the (crystal) particle size of the phosphor is about 5 to 20 μm, and the phosphorescent brightness of the fine powder particles having a smaller particle size is extremely reduced.

Accordingly, it is desirable that fine powder particles having an excessively small particle size be removed by sieving or the like, since the emission luminance is reduced. More specifically, for example, when the granular material of the fluorescent inorganic artificial aggregate is obtained by pulverizing the lump or the large chip, the emission luminance is less than 1.5 mm. Is reduced to about 1/5, and in the case of fine particles less than 0.5 mm, since the emission luminance is reduced to about 1/15, fine particles of less than 0.5 mm, preferably 1.5 mm It is desirable that less than a small amount of fines be removed.

The road, building material or marine fluorescent inorganic artificial aggregate obtained in this manner can be advantageously used for various applications in the same manner as conventional aggregates. For example, as aggregate for roads, it can be used for on-site construction such as center lines, roadside zones, intersections, stop lines, pedestrian crossings, attending school road displays, anti-slip zones at intersections, corners and slopes, direction indication guidance displays, etc. Using such a fluorescent inorganic artificial aggregate, a flexible cloth, a film, a non-woven fabric, etc., in which patterns such as lines and indications are attached to the surface, are prepared in advance, and they are attached on site, It can be used for various purposes such as use. Also, as a construction material for floors and walls, use it in places where light does not reach at night, use it in buildings, underpasses, railway platforms, etc., mix it with aggregates such as artificial stone and terrazzo. Or mixed with tile coating material or spray coating material, or partially used in stair steps, mortar boards for slip prevention, terrazzo, etc., mixed with blind guide boards It can also be used for purposes such as performing, and further, it can be used for creating artistic value by its luminous effect. Furthermore, as an aggregate for ships, it can be used for floors, walls, emergency exits, exits, etc. in ships. As described above, the road, building material or marine fluorescent inorganic artificial aggregate according to the present invention is used not only for general guidance but also for uses such as emergency evacuation guidance. It becomes possible.

The fluorescent inorganic artificial aggregate or the fluorescent inorganic artificial aggregate having a luminous property according to the present invention can be used alone or in combination, but is not limited thereto. It goes without saying that it can be used in various mixing ratios with wood, white artificial aggregates, colored artificial aggregates or non-slip artificial aggregates. When the fluorescent inorganic artificial aggregate according to the present invention is used, various resins such as epoxy resin, unsaturated polyester resin, or acrylic resin, organic binders such as asphalt, and inorganic binders such as cement are used. And applied to road pavement floors and the like.

[0030]

EXAMPLES In order to clarify the present invention more specifically, some examples of the present invention will be shown below.
It goes without saying that the present invention is not subject to any restrictions by the description of such embodiments. In addition, in addition to the following examples, the present invention, in addition to the above-described specific description, various changes, corrections, and modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that improvements can be made.

Example 1 First, a raw material having the composition shown in Table 1 below was prepared, melted, and then solidified by cooling and solidifying to obtain a ceramic base material: A to F. Manufactured.
The hue of each ceramic base material thus obtained is also shown in Table 1 below. The composition shown in Table 1 is a composition after melting. The ceramic base material contains 0.1% by weight of an oxide of a transition metal such as iron, cobalt, nickel, or a heavy metal such as PbO, which lowers the emission luminance of the phosphorescent inorganic phosphor or causes discoloration. Only the following are included.

[0032]

[Table 1]

On the other hand, as the luminous inorganic phosphor, strontium aluminate (SrAl ₂
O ₄ ), Europium (Eu) as an activator
And a phosphor having an appropriate particle size that does not impair the emission characteristics was prepared.

Next, 30% by weight of the phosphorescent inorganic phosphor was added to 70% by weight of each of the obtained ceramic base materials.
The mixture in which the weight% was mixed was fired at 820 ° C. for 30 minutes, and then allowed to cool in a firing furnace to obtain various inorganic artificial aggregates. And their hues, physical properties, phosphorescence brightness before and after the weathering process,
And each property of hydrolyzability was examined, and the results are shown in Table 2 below.

[0035]

[Table 2]

In Table 2, the physical properties represented by water absorption (%), apparent specific gravity (g / cm ³ ), bulk specific gravity (g / cm ³ ), and apparent porosity (%) are defined by JIS. -A111
0 was measured. As for the phosphorescent brightness,
After irradiating light for 4 minutes from a measuring light source installed in the vertical direction with respect to the horizontal plane of the sample, the phosphorescent luminance immediately after the end of the irradiation and the phosphorescent luminance two minutes after the end of the irradiation are measured in the direction of 45 ° above the sample. (See FIG. 1). As the irradiation conditions, the light source used was a halogen lamp, the illuminance was 1000 lux, and the irradiation time was 4 minutes. Also, the weathering process
"Accelerated exposure test method W" described in IS-A1415
V type ", and the processing time was 500 hours. Further, the hydrolyzability was evaluated by observing the degree of whitening after treating the fluorescent inorganic artificial aggregate for 2 hours in boiling water.

As apparent from the results shown in Table 2,
In addition, the characteristics of each fluorescent inorganic artificial aggregate
It is evident that the value fluctuates significantly depending on the material properties of the base metal.
It was clear. That is, SiO_Two, B_TwoO_Three, Alkali gold
Sodium borosilicate ceramics based on metal oxides
When used, the resulting fluorescent inorganic artificial aggregate
The characteristics are improved. In addition, such ceramics
Among the base materials, B _TwoO_ThreeIs about 20 to 30% by weight,
Alkali metal oxide is about 10 to 20% by weight in total
Is where the melting point is around 800 ° C
It is preferable.

The divalent alkaline earth metal oxide is
Although it is preferable as a low-flammable raw material, when the content of CaO becomes too large as 12.12% by weight, such as the ceramic base material C used in Example 3 of the present invention, the obtained fluorescent inorganic material is used. The phosphorescent brightness of the artificial aggregate was reduced to about half, and the emission color changed from green-yellow to orange. Therefore, a ceramic base material having an alkaline earth metal content of more than 10.0% by weight is not so preferable.

Further, as shown in ceramic base material: D,
A ceramic base material containing a large amount of milky material such as titania (TiO ₂ ), zirconia (ZrO ₂ ), and tin oxide (SnO ₂ ) becomes white and opaque, and as a result, the fluorescent inorganic artificial bone of Example 4 of the present invention is obtained. Like a material, its light-emitting performance (phosphorescence luminance) is extremely reduced. Therefore, it is desirable that the content of opacifying materials such as titania, zirconia, and tin oxide in the ceramic base material be 10% by weight or less, preferably 5% by weight or less.

Further, as the refractory raw material, silicic acid (SiO ₂ ) or alumina (Al ₂ O ₃ ) can be mainly used. However, when the content of alumina is too large, the fire resistance is too high. As a result, sufficient sintering cannot be obtained and whitening and opacity progress. Therefore, in the fluorescent inorganic artificial aggregate of Example 5 and Comparative Example 1 obtained by using such a ceramic base material, the light emission characteristics are reduced and the water absorption is increased. The physical properties and durability also decrease, and the hydrolyzability of the phosphorescent inorganic phosphor contained therein also increases, so that the phosphorescence luminance after the weathering treatment is lower than before the weathering treatment. .

Further, in the case of the ceramic base material: F, which has an extremely high alumina content of 22.88% by weight, sodium oxide (Na ₂ O) and phosphoric acid (P ₂ O ₅ ) as low-flammable raw materials are used. ) Does not provide sufficient sintering and is opaque whitened, and as a result, the fluorescent inorganic artificial aggregate obtained using it (Comparative Example 1) has The ratio is about 4.3%, and the material is porous. The light-emitting characteristics (phosphorescence luminance) are extremely reduced, and the light-emitting characteristics after the weather resistance test are significantly reduced, so that they are easily hydrolyzed.

Example 2 In the same manner as in Example 1, 30% by weight of the phosphorescent inorganic phosphor obtained by adding europium as an activator to strontium aluminate was manufactured in Example 1. Ceramic base material: 70% by weight of A was mixed in a powder state, and then fired under firing temperature conditions shown in Table 3 below to obtain various fluorescent inorganic artificial aggregates. Then, these characteristics were examined in the same manner as in Example 1, and the results are shown in Table 3 below.

[0043]

[Table 3]

As is apparent from the results shown in Table 3, when a fluorescent inorganic artificial aggregate is manufactured using the ceramic base material: A, the firing temperature is 800 ° C.
Under the conditions of, the water absorption is 5% or more, and the apparent porosity is also 1
It was as high as 4.6%, so that the phosphorescent brightness was lower than that under other firing temperature conditions. It is considered that the reason for this is that a sufficient protective layer cannot be formed on the surface of the phosphorescent inorganic phosphor that is dispersed and contained because the firing temperature is low. Further, in the case of the fluorescent inorganic artificial aggregate obtained by baking under a temperature condition of 800 ° C. (Comparative Example 2), whitening due to boiling water is remarkable, hydrolyzability is large, and oxidative decomposition, hydrolysis, etc. It is expected that the light emission luminance will decrease due to environmental factors.

The fluorescent inorganic artificial aggregates (Examples 1 and 6 of the present invention) obtained by firing at a temperature of 820 ° C. or more had a water absorption of 0.35% to 0.36%. It was possible to obtain ceramics having a porosity of 1.0% or less and a dense structure, and it was possible to improve the mechanical properties, body abrasion, and durability as aggregates, and to obtain phosphorescent brightness. Was also big. Further, the obtained fluorescent inorganic artificial aggregate was hardly hydrolyzed and had good oxidation resistance and the like.

However, in the case of the fluorescent inorganic artificial aggregate obtained by firing under the temperature condition of 850 ° C. (Example 6 of the present invention), although the denseness of the aggregate is improved, the firing temperature condition is slightly increased. It is recognized that the phosphor is too high, and the oxidative decomposition of the phosphor in the firing process proceeds, and the light emission luminance is slightly lowered.

Therefore, as a firing temperature condition for obtaining the fluorescent inorganic artificial aggregate, the obtained aggregate has a water absorption of 4.0.
%, Preferably 2% or less. When firing under high temperature conditions, it is desirable to use a suitable ceramic base material and to control the firing atmosphere so that the emission luminance does not decrease due to the oxidative decomposition of the phosphor.

Example 3 In the same manner as in Example 1, the phosphorescent inorganic phosphor composed of strontium aluminate and europium as an activator was added to the ceramic base material A produced in Example 1 as follows. The mixture was mixed so as to have the content shown in Table 4, and the obtained mixture was baked for 30 minutes at a temperature of 820 ° C to obtain a desired fluorescent inorganic artificial aggregate. Then, the characteristics of the obtained fluorescent inorganic artificial aggregate were examined in the same manner as in Example 1, and the results are shown in Table 4 below.

[0049]

[Table 4]

As is evident from the results shown in Table 4, as the phosphor content increases, the phosphorescent brightness of the aggregate increases. However, when the content exceeds 50% by weight, the reverse is observed. In addition, it is recognized that the phosphorescent luminance is reduced. The reason for this is that as the phosphor content increases, the relative amount of the ceramic base material to the phosphor decreases, making it difficult to coat the phosphor with the ceramic base material. It is considered that the porosity increases and the dense structure of the aggregate is lost.

When the content of the phosphor exceeds 50% by weight, the water absorption and the apparent porosity sharply increase, so that the hydrolyzability also increases. This is because, when the content of the phosphor exceeds 50% by weight, usually, the ceramic base material is wrapped around the phosphor, so that the formed ceramic protective layer becomes gradually difficult to be formed.
This is because the phosphor is oxidatively decomposed during the firing process. In addition, such a fluorescent inorganic artificial aggregate having a high water absorption and an apparent porosity is likely to undergo oxidative decomposition and hydrolysis during use. It is expected to deteriorate.

Example 4 First, in the same manner as in Example 1, 30% by weight of the phosphorescent inorganic phosphor composed of strontium aluminate and europium as an activator, and the ceramic base material manufactured in Example 1 were used. : A mixture obtained by mixing with 70% by weight of A was shaped, granulated, and fired to produce a granulated product of No. 6 artificial aggregate. On the other hand, after the mixture of the phosphorescent inorganic phosphor and the ceramic base material was melted, cooled, and the obtained aggregate was pulverized, thereby producing a pulverized product of artificial aggregate having each particle size. Then, the phosphorescence luminance of the obtained granulated product or pulverized product was measured, and the results are shown in Table 5 below. The particle size ranges are also shown in Table 5 below.

[0053]

[Table 5]

As shown in Table 5, the pulverized product tended to have slightly lower phosphorescent brightness than the granulated product. In addition, the pulverized product showed a tendency that the phosphorescent luminance decreased as the particle size became finer. More specifically, 1.5
crushed products under 0.5 mm or 0.5 mm, especially 0.
In the case of a pulverized product under 5 mm, the phosphorescent luminance is significantly reduced. Specifically, in the case of fine powder under 1.5 mm, the phosphorescent luminance is reduced to about 1/5 and 0.5 m
It has been clarified that the fine powder of m-under is reduced to about 1/15.

Embodiment 5 In this embodiment, an example is shown in which a stop line at a road intersection is actually formed in accordance with the neat method using the road, building material or marine fluorescent inorganic artificial aggregate according to the present invention.

First, as the phosphor, two kinds of phosphorescent inorganic phosphors and inorganic phosphors shown below were prepared, and the ceramic base materials produced in Example 1 were respectively used for 30% by weight of them. 70% by weight of A was mixed to obtain a mixture. Fluorescent component activator Luminescent inorganic phosphor SrAl ₂ O ₄ Eu Inorganic phosphor 3 (BaMg) O · 8Al ₂ O ₃ Eu, Mn

Next, the obtained mixture was heated at 850 ° C.
After baking for 30 minutes under the above temperature conditions, the mixture was allowed to cool in a furnace to produce two kinds of fluorescent inorganic artificial aggregates. In addition,
In this embodiment, a fluorescent inorganic artificial aggregate containing a luminous inorganic phosphor is referred to as a luminous fluorescent aggregate, while a fluorescent inorganic artificial aggregate containing an inorganic phosphor is referred to as a fluorescent aggregate. And

[0058] Then, each of the obtained phosphorescent aggregate or fluorescent aggregate above, pulverization, by sieving, particle size to produce a A ₁ grain of 3.3～2.0Mm. The A ₁ grain of the resulting two types of aggregates, as shown in Table 6, in plain, or in combination with, according neat method, to form three stop line. In addition, as a binder resin, methyl methacrylate (M
MA) -based resin, the amount used is 1.5 kg per 1 m ²
And The total amount of aggregate used was set to 6 kg per 1 m ² .

[0059]

[Table 6]

The stop lines formed as described above were evaluated for their fluorescent and phosphorescent properties, and the results are shown in Table 6 above. In addition, the fluorescent light emission irradiates the headlight of the car from a place 10 m away from the stop line at night, and the light emission is determined by the naked eye, and the phosphorescent light emission is 10 m away from the stop line at night. The lights were turned off after irradiating the headlights of the car from the place for 4 minutes, and two minutes after the lights were turned off, judgment was made by naked eyes. Also,
The evaluation was ◎: excellent light emitting property, 発 光: good light emitting property, Δ: light emitting property was recognized.

As is apparent from the results shown in Table 6, the stop line formed using only the fluorescent aggregate is
It exhibited excellent fluorescence, but did not exhibit phosphorescence. In addition, the stop line formed by using only the phosphorescent fluorescent aggregate exhibits a good fluorescence emission property, although it is inferior to the stop line formed by using only the fluorescent aggregate, and has excellent phosphorescence. It exhibited luminescence. Further, the stop line formed by using the fluorescent aggregate and the luminous fluorescent aggregate at a ratio of 1: 1 exhibited excellent fluorescent light emission and also excellent phosphorescence. In short, the stop line formed using a combination of the fluorescent aggregate and the luminous fluorescent aggregate exhibits good light emission characteristics both at the time of irradiation and at the time of turning off the light. It is understood that is greatly improved.

The aggregate used here is not limited to a combination of a fluorescent aggregate and a luminous fluorescent aggregate as in this embodiment, and various types of conventionally known natural bones are used. Needless to say, it can be used by mixing with various materials and artificial aggregates at various mixing ratios.

[0063]

As is clear from the above description, the fluorescent inorganic artificial aggregate for roads, building materials or marine vessels according to the present invention has a high luminous brightness due to fluorescence or phosphorescence, and is dense as an aggregate. It has excellent mechanical strength, abrasion resistance, or weather resistance, and has excellent durability performance, so that deterioration of the fluorescent characteristics can be effectively suppressed. Thus, it can be advantageously used as an aggregate for roads, an aggregate for construction materials or an aggregate for ships.

Further, in such a road and building material or a marine fluorescent inorganic artificial aggregate according to the present invention, the granular material constituting the fluorescent inorganic artificial aggregate should not contain fine particles of less than 0.5 mm. By doing so, more excellent light emission characteristics can be exhibited, and deterioration of light emission luminance can be effectively suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an apparatus for measuring the phosphorescence luminance of a fluorescent inorganic artificial aggregate obtained in an example.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C09K 11/63 CPM C04B 35/60 A (72) Inventor Tsuyoshi Naruse 4-11 Shiogusa-cho, Seto-shi, Aichi Pref. Inside

Claims (2)

[Claims] 1. A particulate material comprising particles of an inorganic phosphor and / or a phosphorescent inorganic phosphor dispersed and contained in a ceramic matrix having a high translucency that forms a continuous phase,
Roads and building materials characterized in that the content of the inorganic phosphor and / or the phosphorescent inorganic phosphor in the granular material is 3 to 50% by weight and the water absorption is 4.0% or less. Or a fluorescent inorganic artificial aggregate for ships. 2. The method according to claim 1, wherein the granular material comprises the inorganic phosphor and / or
Or a mass or a large chip obtained by melting or firing the particles of the phosphorescent inorganic phosphor and the ceramic base material, and having a size of 0.5 mm or more obtained by sieving, substantially The fluorescent inorganic artificial aggregate for roads, building materials or ships, according to claim 1, characterized in that it does not contain fine particles of less than 0.5 mm.