JP5159328B2 - Paving material, method for producing the same and paving body - Google Patents

Description

  The present invention relates to a pavement material used for pavement such as roads, and more particularly to a pavement material capable of suppressing a temperature rise due to irradiation of light rays such as sunlight.

  In recent years, the rise in temperature due to global warming has become a problem. As one of such temperature rises, it is widely known that a heat island phenomenon occurs mainly in large cities, in which the temperature does not decrease even at night in the summer. One of the causes of the heat island phenomenon is considered to be that the pavement material covering the ground surface is irradiated with sunlight during the day, the temperature rises, and this heat storage is released at night.

  In this way, mainly from the viewpoint of global environmental problems such as the heat island phenomenon, there is a demand for pavement materials that can suppress the temperature rise of the pavement materials due to the irradiation of light such as sunlight and reduce the amount of stored heat. It is definitely increasing.

  As a pavement material in which the temperature rise of the pavement material is suppressed, for example, as shown in Patent Document 1, a white pigment having a heat shielding effect as required is disposed around a core material through an adhesive such as a resin. A pavement material using is known. In this pavement material, heat is prevented from being transferred to the inside of the pavement due to the heat insulating effect of the hollow body, and the white pigment is suppressed from increasing the temperature of the pavement due to the heat shielding effect of reflecting light rays. Yes.

  In addition, a water-retaining pavement is known in which a water-retaining material such as a water-absorbing polymer is disposed between core materials (aggregates) and a resin mortar is disposed between the core materials of the pavement surface forming the pavement surface. (Patent Document 2). In addition, the elastic aggregate, the binder that surrounds the elastic aggregate, and the water-retaining layer composed of a water-absorbing polymer that is at least partially exposed from the binder surface so that sufficient water can be absorbed and discharged, and the elastic layer disposed thereon The paving body which becomes is also known (patent document 3).

In the pavement having such water retention, water is contained in the water retention material by watering or the like, and the temperature rise is suppressed by the heat of vaporization when the water is discharged from the water retention material and evaporated.
JP 2004-218340 A Japanese Patent Laid-Open No. 2004-3158 JP 2003-138510 A

  However, in a pavement material in which a hollow body is only disposed through an adhesive such as a resin around the core material, the effect of suppressing temperature rise is limited, and when a white pigment is used, the entire pavement material becomes white. End up. Ordinary roads, parking lots, and the like cannot be white-paved to ensure the distinguishability of the white paint applied on the roads to show center lines, pedestrian crossings, and the like. Even when the distinction from the white paint is not required, the white pavement strongly reflects the direct sunlight, so that the road surface becomes dazzling and tends to be avoided. Therefore, there is a problem that the use that can be used is limited to a special one.

  On the other hand, in a pavement in which a water retaining material (water absorbing polymer) is disposed between core materials, when the water absorbing polymer absorbs water, the volume of the polymer significantly expands, for example, 100 times or more before water absorption, and a part of the expanded polymer Therefore, it is necessary to provide a resin mortar or an elastic layer that forms the paved surface on the upper part in order to prevent this. As a result, the number of unnecessary steps increases, and water passes through these extra layers and then reaches the water retaining material, resulting in a problem that absorption and discharge are reduced.

  In addition, it is usually necessary to provide a considerable gap between the core material and the core material so that the water-absorbing polymer disposed between the core materials can expand, for example, 100 times or more when water is absorbed. Had the problem of low.

  Therefore, the present invention is a pavement that can sufficiently suppress the temperature rise, can be colored in any color, does not require an additional layer for forming a pavement surface on the pavement surface, and is sufficient. An object of the present invention is to provide a paving material having strength and a method for producing the same.

  The present invention is an aggregate of a plurality of particles (paving material constituting particles), each of which is a core material, and an infrared shielding member having a diameter of 0.4 to 3.0 μm, which is disposed on the outer periphery of the core material via a resin. It is a paving material characterized by including particles.

  The present invention is also a method for producing a pavement material in which each particle is an aggregate of a plurality of particles having a core material, the step of surrounding the core material with a resin, and infrared rays on the outer periphery of the outer core material via the resin It is a manufacturing method of the paving material characterized by including the process of fixing shielding particles.

  According to the present invention, a pavement material capable of suppressing temperature rise, which can be colored in any color other than white, and forms a new pavement surface to prevent the water-absorbing polymer from protruding on the pavement surface. It is possible to provide a pavement material having a sufficient strength and a manufacturing method thereof without requiring an additional layer.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the accompanying drawings, in order to facilitate understanding of the characteristic portions of the invention, the characteristic portions and the like are emphasized by drawing larger than the actual size. Therefore, it should be noted that the relative sizes between the elements in the attached figures may differ from those in practice.

  Further, the term “paving material” used in this specification means an aggregate of paving material constituting particles. When actually paving a road or the like, the paving material is mixed with a binder and then paved. Lay on the body. On the other hand, the pavement refers to a pavement material having a desired shape such as a plate shape or a column shape in order to actually lay the pavement material on a pavement using a binder or the like.

  Embodiments of the present invention can be broadly classified into two, Embodiment 1 mainly based on the heat shielding effect by any colorable infrared shielding particles and Embodiment 2 mainly based on the cooling effect by the water-absorbing polymer. These two embodiments will be described in order below.

  In addition, when the symbol used for drawing is the same, it shows that it is the same or the same kind of goods irrespective of Embodiment 1 and Embodiment 2 unless there is particular description.

(1) Embodiment 1
FIG. 1 is a cross-sectional view showing pavement material constituting particles 100 constituting the pavement material according to the first embodiment of the present invention. The pavement material constituting particle 100 is a pavement material including resin 2 surrounding the core material 1 and infrared shielding particles 5 arranged on the outer periphery of the core material via the resin 2. The infrared shielding particles 5 have a diameter of 0.4 to 3 μm.

  Conventionally, it has been practiced to apply a paint made of a white pigment or the like to the surface of a pavement and to suppress the temperature rise of the pavement by reflecting incident sunlight.

  However, the method of coating the surface has a problem that the effect disappears in a relatively short time because the paint disappears during use due to peeling or abrasion. Therefore, for example, as described in Patent Document 1, the core material is whitened, or a white pigment having a heat-shielding effect is mixed into the pavement material, so that the color of the pavement material and the pavement body using the white color increases. A pavement that obtains a suppressing effect and solves the problem of low durability due to peeling and wear is known. However, as described above, the color of the pavement cannot be a color other than white, and there is a problem that the use is limited.

  The present inventor has conducted earnest research and found that the temperature increase of the pavement can be suppressed by using the infrared shielding particles 5 that selectively scatter infrared rays among the sun rays including light of various wavelengths as follows. It was.

  Most of infrared rays contained in the sun rays have a wavelength of 0.7 to 3.0 μm. Therefore, for the purpose of effectively scattering the incident infrared rays, the particle diameter of the infrared shielding particles 5 is set to about half of the infrared wavelength to effectively suppress the temperature rise. That is, the diameter of the infrared shielding particles 5 is 0.4 to 3.0 μm, preferably 0.5 to 2.0 μm.

  The diameter of the infrared shielding particle 5 can be obtained from, for example, a transmission electron microscope image obtained by observing the infrared shielding particle 5 or the pavement material constituting particle 100 including the infrared shielding particle 5 with a transmission electron microscope.

  The infrared shielding particles 5 are preferably arranged so as to substantially cover the outer surface of the core material 1, and therefore, the infrared shielding particles 5 are preferably contained in an amount of 5 parts by weight or more with respect to 100 parts by weight of the core material 1. More preferably, it is contained in a part or more. Moreover, since there is a possibility that the pavement using the pavement material constituting particles 100 may not have sufficient elasticity if there are too many infrared shielding particles 5, the infrared shielding particles 5 are 100 parts by weight or less with respect to 100 parts by weight of the core material 1. It is preferable that

  In the embodiment shown in FIG. 1, the resin 2 is mainly disposed between the core material 1 and the infrared shielding particles 5, and the infrared shielding particles 5 are disposed on the outermost surface of the paving material constituting particles 100. 2 and the infrared shielding particles 5 may be mixed in advance and the mixed material may be further mixed with the core material 1 to arrange the infrared shielding particles 5 inside the resin 2.

  The shape of the infrared shielding particles 5 is preferably approximately spherical, but is not limited thereto, and may be any shape including, for example, a scale shape, a rugby ball shape, a rod shape, and a disk shape. In the case of a shape other than a sphere, the diameter of the infrared shielding particle can be expressed using the value of the diameter of a sphere having the same volume.

  A preferable material for the infrared shielding particles 5 is titanium oxide, and may contain additives such as aluminum oxide, potassium carbonate, and zinc compound as necessary. Moreover, you may perform the surface treatment which improves characteristics, such as a dispersibility, for example, coating of an oxide or a hydroxide as needed. In addition to this, an oxide such as iron oxide can also be used as the infrared shielding particles 5.

  Moreover, although the original color of titanium oxide is white, in order to obtain paving materials other than white which is one of the purposes of the present application, it may be colored using a desired pigment. Further, in order to obtain a desired color paving material, for example, the first color infrared shielding particles including white and the second color infrared shielding different from the first color (colored in a different color). A plurality of colors of infrared shielding particles such as particles may be used.

  In this way, even if the color other than white is colored, the heat shielding effect substantially equivalent to that of a pavement material (paving body) using a conventional white heat shielding pigment is obtained by the infrared scattering effect of the infrared shielding particles 5. Is possible.

  In addition, as in the case of a conventional pavement material using a white heat-shielding pigment, white infrared shielding particles 5 can be used when used in applications where the color of the pavement may be white. When the surface color of the pavement material constituting particles 100 is white using the white infrared shielding particles 5, the reflection effect in the entire wavelength region due to the white color as in the conventional pavement material, and the infrared shielding particles 5 Compared with the conventional pavement material both by the infrared scattered light effect, the temperature rise suppression effect (heat-shielding effect) more excellent is shown.

Details of the core material 1 and the resin 2 are shown below.
The core material 1 can be cement, plastic, rubber, and fired products such as insulators, tiles, bricks, and the like that have been conventionally used as a core material (or aggregate) for pavement materials. Among these, rubber materials are preferable because they can ensure the elasticity of paving materials, and waste rubber materials (for example, waste tire pulverized materials) are particularly preferable materials from the viewpoint of ecology because used rubber can be recycled. The core material 1 is preferably substantially spherical and has a diameter of 0.5 to 10 mm, more preferably 1 to 5 mm.

  Since most of the surface of the core material 1 is covered with the resin 2 and the infrared shielding particles 5, the color may be any color including white, transparent, and black.

  The resin 2 may be any resin as long as it has fluidity and can be solidified. The resin 2 may be transparent or opaque, and may have any color, but has high infrared transmission ability. Resins are preferred. In particular, when the infrared shielding particles 5 are arranged inside the resin 2 as described above, the resin 2 needs to be able to transmit infrared rays. Examples of a preferable resin as the resin 2 include a urethane resin, an acrylic resin, and an epoxy resin.

  Since the resin 2 preferably has a sufficient amount to cover the entire outer periphery of the core material 1, the pavement material constituting particle 100 contains 5 parts by weight or more of resin with respect to 100 parts by weight of the core material 1. It is preferable to include. On the other hand, if the resin 2 is too much, foaming or a decrease in dispersibility between the particles of the core material 1 and aggregation of the core material 1 occur. Therefore, the resin 2 is 40 parts by weight or less with respect to 100 parts by weight of the core material 1. Preferably there is.

Next, the manufacturing method of the paving material comprised by the paving material constituent particles 100 will be described below.
A predetermined amount of the core material 1 and the liquid resin 2 that is not solidified are mixed using, for example, a mortar mixer, and the core material 1 is covered with the resin 2.

  And in order to arrange the infrared shielding particles 5 on the outer surface of the paving material constituting particles 100, the infrared shielding particles 5 are added after the core material 1 and the resin 2 are mixed. Before or simultaneously with the addition of the infrared shielding particles 5, an extender such as calcium carbonate may be added as necessary.

  The added infrared shielding particles 5 are bonded and fixed to the surface of the core material 1 by the resin 2. Further, the resin 2 having adhesive force exists between the core material 1 and the infrared shielding particles 5, and the infrared shielding particles 5 are located on the outer surface of the paving material constituting particles 100, so that the paving material constituting particles 100 Since no adhesive force acts between them, the pavement material constituting particles 100 are separated from each other, that is, granular.

  And the paving material which consists of paving material constituent particles 100 can be obtained by hardening resin 2. The resin 2 is cured by adding a catalyst or the like in advance and curing the cured infrared heat shielding particles after mixing them. In addition to this, a thermosetting resin is used for heating and curing. Alternatively, there are various methods when cured by irradiating ultraviolet rays or the like, and can be appropriately selected according to the type of the resin 2.

  In the case of obtaining a pavement material composed of pavement material constituting particles 100 in which the infrared shielding particles 5 are distributed in the resin 2, for example, the resin 2 and the infrared shielding particles 5 are mixed in advance, and then the core material 1 is added. is there. In this case, the uncured resin 2 having adhesive force is located on the outer surface of the pavement material constituting particle 100. For this reason, in order to obtain a granular paving material in which the paving material constituting particles 100 are not bonded to each other, the resin 2 and the infrared shielding particles 5 are preliminarily mixed, and the core material 1 is further mixed, For example, a step of forming particles using a rotary kiln may be used.

  The paving material comprising the paving material constituting particles 100 thus obtained is used as an aggregate, and after adding a resin such as urethane as a binder, it is laid on a target paving body such as a road and the binder is cured. A pavement can be obtained. The amount of the binder used is preferably 5 to 40 parts by weight with respect to 100 parts by weight of the paving material composed of the paving material constituting particles 100.

  In this way, the manufactured pavement has a high heat shielding effect and suppresses the temperature increase of the pavement because the pavement material constituting particle 100 scatters the wavelength of the infrared ray in the solar ray incident on the pavement. It becomes possible to do.

  FIG. 2 is a view showing a cross section of the pavement material constituting particles 200 constituting the pavement material which is a modification example included in the first embodiment. The resin 2 has a hollow body 3. The other parts are the same as the paving material constituting particles 100. The hollow body 3 has, for example, a gas such as air whose inside is normal pressure or reduced pressure, or a vacuum, and the outside is made of glass, ceramics, resin, metal, or a composite material thereof, and the inside is hollow. It functions as a heat insulating material.

  When the outer shape of the hollow body 3 is substantially spherical, the outer diameter is preferably 1 to 100 μm. The outer shape is not limited to a substantially spherical shape, and may be any shape such as an oval shape. Preferred hollow bodies are, for example, glass balloons and shirasu balloons.

  Preferably, the hollow body 3 is mixed with the resin 2 before the infrared shielding particles 5 and the resin 2 are mixed. This is because the infrared shielding particles 5 are distributed on the surface of the pavement material constituting particles 200. The hollow body 3 is preferably added in an amount of 1 to 10 parts by weight with respect to 100 parts by weight of the core material 1.

  Thus, the pavement material created using the pavement material constituting particles 200 including the hollow body 3 having a heat insulating effect further improves the heat shielding effect, and the pavement using the pavement material has a further temperature rise suppressing effect. It is possible to obtain.

(2) Embodiment 2
3 and 4 are views showing a cross section of the pavement material constituting particles 300 constituting the pavement material according to the second embodiment of the present invention. A core material 1 and a resin 2 covering the core material 1 are arranged, and particulate water-absorbing polymer 4 (water-absorbing polymer 4 ′ in FIG. 4) is dispersedly arranged inside the resin 2. The water-absorbing polymer 4 shown in FIG. 3 has absorbed water and expanded. Since the surface of the water-absorbing polymer 4 is in contact with the resin 2 and is restrained by the resin 2, the surface of the water-absorbing polymer 4 cannot absorb water and cannot expand.

  On the other hand, the water-absorbing polymer 4 ′ in FIG. 4 shows a state in which water is discharged and contracted, and voids are recognized around the water-absorbing polymer 4 ′.

  In the pavement using the pavement material which is an aggregate of the pavement material constituting particles 300, water is supplied to the pavement surface by, for example, a water truck, and the water-absorbing polymer 4 absorbs water. Thereafter, the water-absorbing polymer 4 slowly discharges water over time, and while the water is completely discharged (water-absorbing polymer 4 ′) shown in FIG. Takes away heat from the body and suppresses temperature rise.

  Further, since the water-absorbing polymer 4 is surrounded by the resin 2, the water-absorbing polymer 4 does not protrude from the surface of the pavement due to expansion during water absorption in the pavement according to the present embodiment. Therefore, it is not necessary to provide an additional layer such as an elastic layer for suppressing the protrusion of the water-absorbing polymer on the pavement using the pavement made of the pavement constituting particles 300. In addition, even if the volume of the water-absorbing polymer 4 changes due to expansion and contraction, the outer shape of the pavement material constituting particle 300 does not change, so that the bonding between the pavement material constituting particles 300 is ensured by the binder resin when forming the pavement. By doing, the strength of the paving body can be easily secured.

  As the water-absorbing polymer 4, commercially available water-absorbing polymers can be used, but polyacrylic acid soda, polyvinyl alcohol, and cellulose compounds are preferable. The water-absorbing polymer 4 preferably has a water absorption capacity (a ratio of the mass of water that can be absorbed with respect to the mass of the water-absorbing polymer) of 50 times or more, more preferably 100 times or more.

  A space in which the water-absorbing polymer 4 can be expanded inside the resin 2 by allowing the water-absorbing polymer 4 to absorb water in advance and then mixing with the resin 2 to cure the resin 2 while the water-absorbing polymer 4 has absorbed water. (A space around the water-absorbing polymer 4 ′ in FIG. 4) can be secured. A specific manufacturing method will be described later.

  If the amount of water absorbed in the water-absorbing polymer 4 is too small, the water 2 is surrounded by the resin 2 in a state in which the small amount of water is absorbed, so that there is sufficient space for the water-absorbing polymer 4 to expand inside the resin 2. Cannot be secured. On the other hand, if the amount of water to be absorbed is too large, the voids that can be formed in the resin 2 are increased, and the pavement using the pavement material constituting particles 300 is likely to be cracked and the strength of the pavement may be reduced. Therefore, the amount of water to be preliminarily absorbed by the water-absorbing polymer 4 is preferably 5 to 50 times, more preferably 5 to 30 times the weight of the water-absorbing polymer 4.

  In addition, it is preferable that the water absorption capability of the water absorbing polymer 4 is at least twice the amount of water to be absorbed in advance. Even if the same amount of water is absorbed, the water absorption capacity is much greater than the water absorption capacity compared to the case where the water absorption capacity is close to the actual water absorption capacity. This is because the time required for absorption of is short. This characteristic is particularly useful for preventing the water sprayed from being lost by evaporation when water is absorbed by the water-absorbing polymer in the pavement under hot weather.

  On the other hand, if the amount of the water-absorbing polymer is too large, sufficient strength cannot be secured when processed into a pavement, and if it is too small, a sufficient temperature rise suppressing effect cannot be obtained. Preferably, the water-absorbing polymer 4 is in a range of 0.5 to 10 parts by weight in a dry state with respect to 100 parts by weight of the core material 1.

  The size of the water-absorbing polymer 4 is preferably in the range of 100 to 1000 μm in diameter while absorbing water. In FIG. 3, the cross section of the water-absorbing polymer is substantially circular, but is not limited to this, and can have any cross-sectional shape such as an ellipse or a rod. In this case, the diameter of the water-absorbing polymer 4 is the diameter of a sphere having the same volume.

Next, the resin 2 used in Embodiment 2 will be described in detail. The resin 2 according to the present embodiment is a curable resin similarly to the resin 2 of the first embodiment.
Furthermore, as described above, in the present embodiment, since the resin 2 surrounds the water-absorbing polymer 4, the water-absorbing polymer 4 needs to absorb and discharge water through the resin 2. Therefore, the resin 2 must be able to permeate water during use (after curing).

Further, a hole may be formed in a non-permeable (non-permeable) resin by a chemical or physical method so that water can permeate.
The inventors have found that a urethane resin can be used as such a resin.

  Conventionally, urethane resin is used to cover water-containing substances such as water-absorbing polymers because when it comes into contact with water before curing, its isocyanate group reacts with water and foams violently to expand its volume rapidly. Was considered unsuitable. However, as a result of intensive studies by the inventors, the water-absorbing polymer 4 that has previously absorbed moisture slowly discharges the absorbed water, so that the amount of water in contact with the urethane resin is very small and abrupt due to foaming. It was found that the urethane resin after curing did not have a significant volume expansion and had an appropriate water permeability.

  FIG. 5 is an enlarged view of a portion A shown in FIG. 3, and schematically shows a mechanism that is estimated for water permeability expressed in the urethane resin. In the embodiment shown in FIG. 5, the resin 2 is a urethane resin. A small amount of water present on the surface of the water-absorbing polymer that has absorbed water in advance reacts with the resin (urethane resin) 2 to foam, and bubbles 10 are generated around the surface of the water-absorbing polymer 4. Since a very small amount of moisture is supplied into the resin 2 through the bubbles 10, new bubbles 10 are generated at positions away from the water-absorbing polymer 4 (in the upward direction in the case of FIG. 5). A part of these bubbles 10 are continuously connected, penetrate the resin 2 as shown in FIG. 5, and form a through passage connecting the water-absorbing polymer 4 and the outer surface of the resin 2. This through passage exists as it is after the urethane resin is cured, and water can pass therethrough. Therefore, it is estimated that the resin 2 made of the urethane resin has water permeability.

  On the other hand, since the moisture present on the surface of the water-absorbing polymer 4 is very small as described above, the foaming is local, and therefore, no significant volume expansion occurs in the resin 2.

  The core material 1 used in the present embodiment may be the same as the core material 1 described in the first embodiment, and may be any color including white, black, and transparent. In Embodiment 2, since the temperature rise of the pavement material composed of the pavement material constituting particles 300 is suppressed by the vaporization heat of the water discharged from the water-absorbing polymer 4, the core material 1 and / or the resin 2 is white. Even if it does not exist, the temperature rise inhibitory effect equivalent to or more than the paving material using the conventional white heat-shielding pigment can be acquired. Moreover, in the use which can be used even if the coating body is white, by making the core material 1 and / or the resin 2 of the present embodiment white, a more significant heat shielding effect can be obtained as compared with the conventional pavement material.

Next, a method for producing a pavement made of the pavement constituent particles 300 will be described below.
The core material 1 and the resin 2 are mixed using, for example, a mortar mixer, and the periphery of the core material 1 is covered with the resin 2. Next, the particulate water-absorbing polymer 4 in which a predetermined amount of water has been absorbed in advance as described above is mixed. As a result, the water-absorbing polymer 4 is dispersed inside the resin 2 and the water-absorbing polymer 4 that has previously absorbed water is disposed around the core material 1. At this point in time, the resin 2 is not cured, and there are a plurality of core materials 1 and a plurality of water-absorbing polymers 4 surrounding them in the liquid resin 2.

  Here, when a urethane resin is used as the resin 2, local foaming of the urethane resin is started mainly on the surface portion of the water absorbent polymer 4 by a small amount of water discharged from the water absorbent polymer 4. And the penetration path which connects the water absorption polymer 4 and the outer surface of resin 2 as mentioned above is formed.

  Next, in order to obtain a particulate paving material in which the paving material constituting particles 300 are separated one by one, the particles are granulated using a rotary kiln as in the first embodiment. Depending on the type of the resin 2, the resin is cured by the heat of the rotary kiln. Or it hardens | cures with the hardening | curing agent added according to the kind of resin 2, or it hardens | cures by irradiation of an ultraviolet-ray etc., for example.

  Instead of using a rotary kiln, after mixing the water-absorbing polymer 4 described above, an infrared shielding particle is mixed in the first embodiment by mixing a filler such as calcium carbonate and talc, and the pavement constituent particles are separated one by one. A granular pavement material may be obtained by the same mechanism as the granular pavement material.

  In addition, about the manufacture of the paving material which consists of the paving material constituent particle 300, the order of mixing the core material 1, the resin 2 and the water-absorbing polymer 4 previously absorbed is not important, for example, after the core material 1 and the water-absorbing polymer 4 are mixed. The resin 2 may be mixed.

  The pavement material comprising the pavement material constituting particles 300 thus obtained is used as an aggregate, and a room temperature curable resin such as urethane, epoxy, or MMA is added as a binder and laid on a target pavement such as a road, Thereafter, the pavement having a predetermined shape can be obtained by curing the binder. At this time, the resin used as a binder is also preferably a water-permeable resin so that the water-absorbing polymer 4 of the pavement material constituting particles 300 can reliably absorb and discharge water. The amount of the binder to be used is preferably 5 to 40 parts by weight with respect to 100 parts by weight of the paving material composed of the paving material constituting particles 300.

  In this way, the manufactured pavement sprinkles water on the pavement and causes the water absorption polymer 4 of the pavement material constituting particles 300 to absorb water, so that the water absorption polymer 4 discharges water, which is the surface of the pavement. It becomes possible to suppress the temperature rise of the pavement due to the heat of vaporization at the time of evaporation.

FIG. 6 is a diagram illustrating a cross section of a pavement material constituting particle 400 that is a modified example of the pavement material constituting particle 300 included in the second embodiment.
The resin 2 has a hollow body 3. The other parts are the same as the pavement material constituting particles 300. Since the hollow body 3 is the same as that shown in Embodiment 1 and contributes as a heat insulating material, the temperature rise of the pavement can be more effectively suppressed.

  In the manufacturing process of the paving material comprising the paving material constituting particles 400, the hollow body 3 is preferably mixed after the water-absorbing polymer 4 is mixed. The hollow body 3 is preferably added with 1 to 10 parts by weight of the core material 1 with respect to 100 parts by weight.

FIG. 7 is a diagram showing a cross section of a pavement material constituting particle 500 that is another modified example of the pavement material constituting particle 300 included in the second embodiment.
The paving material constituting particles 500 include infrared shielding particles 5 surrounding the core material 1 with the resin 2 interposed therebetween. The infrared shielding particles 5 are the same as those shown in the first embodiment. The amount of the infrared shielding particles 5 to be mixed is preferably 5 to 100 parts by weight and more preferably 20 to 100 parts by weight with respect to 100 parts by weight of the core material 1.

  When the pavement material made of the pavement material constituting particle 500 is produced, after the same manufacturing process as the pavement material made of the pavement material constituting particle 400, the infrared shielding particles 5 are mixed to the outer surface of the pavement material constituting particle 500. Since the infrared shielding particles 5 are located and the adhesive force by the resin 2 does not act between the paving material constituting particles 500, each grain of the paving material constituting particles 500 is separated without using a rotary kiln, that is, granular. Can be obtained.

As a further modification of the pavement material composed of the pavement material constituting particles 500, a pavement material having the same pavement material constituting particles as the pavement material constituting particles 500 but not having the hollow body 3 may be obtained.
As described above, the pavement produced using either the pavement material made of the pavement material constituting particles 400 and the pavement material made of the pavement material constituting particles 500 is the same as the pavement using the pavement material made of the pavement material constituting particles 300, The vaporization heat of the water discharged from the water-absorbing polymer 4 suppresses the temperature rise of the pavement.

  Furthermore, since the pavement material constituting particle 400 has the hollow body 3 having a heat insulating effect, the pavement using the pavement material constituting particle 400 exhibits a more excellent temperature rise suppressing effect. Since the pavement using the pavement material constituting particles 500 further includes the infrared shielding particles 5, the pavement constituting particles 500 exhibit a further excellent temperature rise suppressing effect.

  Of course, any pavement material composed of the pavement material constituting particles 300, 400 or 500 can be changed from black to a color other than white by changing the colors of the core material 1 and the resin 2.

  Furthermore, in the pavement produced using the pavement material comprising any one or more of the pavement material constituting particles 300, 400, 500, the cured resin 2 surrounds the water-absorbing polymer 4 as described above. Even if the water-absorbing polymer 4 absorbs water, the water-absorbing polymer 4 does not protrude from the surface of the pavement even if a new layer is not added to the pavement because of the restraint by the resin 2.

  In addition, the pavement produced using the pavement material comprising any one or more of the pavement material constituting particles 300, 400, 500 has the resin 2 as the outer surface of the pavement and the water absorbing polymer 4 as the outer surface of the pavement. Therefore, it is possible to ensure high bonding strength when bonding the paving material constituting particles with the binder. Therefore, this pavement has a strength with no practical problem.

1. Example (1) Effect of Inhibiting Temperature Rise of Infrared Shielding Particles According to Embodiment 1 100 parts by weight of waste rubber material (tire ground material) having a particle diameter of 1 to 5 mm is used as a core material (or aggregate). As shown, 15 parts by weight of resin (urethane resin for molding rubber mortar) was added and stirred using a mortar mixer. Furthermore, as a hollow body (hollow material) shown in Table 1, a vacuum balloon manufactured by Tokai Kogyo Co., Ltd., Cellstar Z-25 (glass balloon, average particle size 65 μm, bulk density 0.16 g / cm ³ , hereinafter this example and examples) 3 parts by weight of the same hollow body used in 2) was added and further stirred.

In Example 1-1, white infrared shielding particles made of white TiO ₂ having an average diameter of 1.0 μm and black infrared shielding particles made of iron oxide having an average particle diameter of 1.0 μm were mixed at 63: 7. As a whole, 70 parts by weight of gray infrared shielding particles whose appearance was gray as a whole were mixed and stirred. In Example 1-2, 70 parts by weight of the above-described white infrared shielding particles were mixed and stirred.

  On the other hand, in Comparative Example 1-1, 70 parts by weight of a white pigment manufactured by Ishihara Sangyo Co., Ltd., which has been conventionally known to have a heat shielding effect, is mixed and stirred. 70 parts by weight of a gray pigment manufactured by Ishihara Sangyo Co., Ltd. having substantially the same color tone as the shielding particles was mixed. Each sample was made into a granular form in which each particle of the paving material constituting particles was separated by mixing infrared shielding particles or pigments. This granular mixture was cured in the air for 24 hours to cure the resin and obtain a paving material. The appearance of the pavement material of Example 1-1 and Comparative Example 1-2 is substantially the same gray as the added gray infrared shielding particles or gray pigment, and the pavement material of Example 1-2 and Comparative Example 1-1 is added. The white infrared shielding particles or white pigments were almost the same white color,

  Furthermore, as shown in Table 1, after adding 22 parts by weight of urethane resin as a binder to 100 parts by weight of each pavement material and stirring using a mortar mixer, the thickness is thickened on a 30 mm thick polyethylene insulator. A rectangular parallelepiped having a length of 10 mm, a length of 100 mm, and a width of 100 mm was molded, cured for one week, and the binder was cured to obtain a paved body of each sample. In addition, even if any sample was processed into the paving body, it was almost the same color as the paving material.

  Next, the temperature rise inhibitory effect of the pavement was evaluated. The effect of suppressing the temperature rise is that an infrared lamp (100V-270W) is installed at a position 30 cm vertically from the surface of the pavement, and the surface of the pavement is irradiated with infrared rays for 3 hours (180 minutes). It was evaluated by measuring. In addition, since the influence of environmental temperature is large in the measurement of surface temperature, it evaluated in the temperature-controlled room which maintained temperature at 27 +/- 1 degreeC.

  FIG. 8 shows the evaluation result of the surface temperature. The temperature of the paving body of Example 1-1 whose appearance is gray is stable within a range of 47 to 49 ° C. after 1 hour from the start of irradiation, and is a surface temperature as compared with Comparative Example 1-2 having the same color tone. Is clearly lower. Further, in Example 1-1, the surface temperature is equal to or lower than that of Comparative Example 1-1 in which the surface color is white, and although it is gray, the temperature is equal to or higher than that of the conventional white pavement. It shows the rise suppression effect.

  On the other hand, in Example 1-2, the temperature of the pavement surface is stable at 40 to 42 ° C. after 1 hour from the start of infrared irradiation due to the effect of the infrared heat shielding particles and the heat shielding effect due to the white color. It showed a heat shielding effect.

(2) Influence of the addition amount of the infrared shielding particles In order to investigate the influence of the addition amount of the infrared shielding particles, as shown in Table 2, the addition amount of the gray infrared shielding particles was changed to prepare a paving material. None of the samples shown in Table 2 contains a hollow body. In addition, the sum of infrared shielding particles and calcium carbonate is used to compensate for fluctuations in the amount of infrared particles and to form a granular pavement in which the particles constituting the pavement are separated without using a rotary kiln. Calcium carbonate particles were added so as to be 70 parts by weight with respect to 100 parts by weight. Moreover, the addition amount of the binder at the time of manufacturing a pavement was 16 parts by weight with respect to 100 parts by weight of the pavement material.

  The same material and the same manufacturing method as those described in “(1) Heat shielding effect of infrared shielding particles” were used for the production of paving materials and paving bodies composed of paving material constituting particles, unless otherwise described. In addition, mixing and stirring of calcium carbonate were performed simultaneously with the infrared particles.

  The heat shielding properties of the obtained pavement samples were evaluated by measuring the surface temperature of the pavement as described in “(1) Effect of suppressing temperature rise of infrared shielding particles”. The infrared heat shielding time was 120 minutes. The measurement result of the surface temperature is shown in FIG. Compared with Comparative Example 1-3 which does not contain infrared shielding particles, the surface temperature of 120 minutes after the start of irradiation of the pavement of Examples 1-3 to 1-7 containing infrared shielding particles is lower. In particular, Example 1-7 containing 70 parts by weight of the most gray infrared shielding particles is stable at a temperature in the vicinity of 57 ° C., which is lower by about 10 ° C. or more than Comparative Example 1-3, and exhibits an excellent temperature rise suppressing effect. It was.

(3) Influence of the addition amount of the hollow body In order to investigate the influence of the addition amount of the hollow body, the addition amount of the hollow body was changed as shown in Table 3 to prepare a pavement material. In addition, the amount of resin was increased as the amount of the hollow body added increased so that the resin surrounded the hollow body more reliably. Furthermore, the amount of binder added during the production of pavement was also increased for samples with a higher amount of hollow body added.

  Except where otherwise specified, the same materials and the same manufacturing method as described in “(1) Inhibition of temperature increase of infrared shielding particles” were used for the manufacture of the paving material and the paving body. In the sample shown in Table 3, calcium carbonate is not added.

  The heat shielding properties of the obtained pavement samples were evaluated by measuring the surface temperature of the pavement as described in “(1) Heat shielding effect of infrared shielding particles” (infrared irradiation time 120 minutes). The measurement result of the surface temperature is shown in FIG. The surface temperature after irradiation with infrared rays for 120 minutes is 50 to 55 ° C., and the temperature rise is suppressed. Moreover, the surface temperature is low in the order of Examples 1-10, 1-9, and 1-8, that is, in the order of increasing addition amount of the hollow body, and the temperature rise suppressing effect is increased.

2. Example according to Embodiment 2 Hereinafter, an example according to Embodiment 2 containing a water-absorbing polymer will be described.
(1) Heat shielding effect by addition of water-absorbing polymer As in Embodiment 1, 100 parts by weight of waste rubber material (tire pulverized material) having a particle diameter of 1 to 5 mm is used as a core material. 18 parts by weight of the same rubber mortar molding urethane resin as 1) was added and stirred using a mortar mixer.

  Next, “Aquakeep SA-60N” manufactured by Sumitomo Seika Co., Ltd., which can absorb 400 times the weight of the polymer as the water-absorbing polymer (average diameter 100 μm before water absorption) is 20 times the weight (40 Part by weight of water was absorbed. In Example 2-1, the absorbed water-absorbing polymer was further mixed with the above-mentioned mixture of the core material and the resin and stirred. On the other hand, the water-absorbing polymer was not mixed in Comparative Example 2-1.

  In order to make the pavement into a granular form in which the particles constituting the pavement are separated from each other, 70 parts by weight of calcium carbonate is added to each sample, mixed and stirred, and then cured in air for 24 hours to cure the resin. The pavement material was obtained. The appearance of the pavement material of Example 2-1 and Comparative Example 2-1 was gray.

  Furthermore, as shown in Table 4, after adding 18 parts by weight of a urethane resin as a binder to 100 parts by weight of each paving material and stirring in a mortar mixer, the thickness was increased on a 30 mm thick polyethylene insulator. A rectangular parallelepiped having a size of 10 mm, a length of 100 mm, and a width of 100 mm was molded, cured for one week, and the binder was cured to obtain a paved body of each sample. In addition, even if any sample was processed into the paving body, it was almost the same gray as the paving material.

  Next, the temperature rise inhibitory effect of the pavement was evaluated. The same evaluation method as shown in Embodiment 1 was used. FIG. 11 shows the evaluation results. The surface temperature after 120 minutes of irradiation with infrared rays was 50 ° C. in Example 2-1, which was about 20 ° C. compared to 69 ° C. in Comparative Example 2-1, and showed a remarkable temperature rise suppressing effect.

(2) Heat shielding effect by water-absorbing polymer, infrared shielding particles and hollow body Table 5 shows the composition of the pavement and the pavement according to Examples 2-2 to 2-4. It was manufactured by the following procedure. Unless otherwise specified, the same material as described in “(1) Effect of suppressing temperature increase by addition of water-absorbing polymer” was used, and the same manufacturing method was used.

  27 parts by weight of resin was mixed with 100 parts by weight of the core material and stirred. Next, as shown in Table 5, with respect to 2 parts by weight of the water-absorbing polymer, the amount of water to be absorbed was changed from 20 parts by weight to 80 parts by weight, and the water-absorbing polymer that absorbed water was mixed and stirred.

  Further, 12 parts by weight of the same hollow body as in Example 1 was mixed and stirred, and then 70 parts by weight of the same gray infrared shielding particles as in Example 1 were mixed and stirred. And after making the particle | grains which the particle | grains of the pavement material separated into grains one by one, they were cured in the air for 24 hours to cure the resin and obtain a pavement material. Examples 2-1 to 2-3 Each of the pavement materials had the same gray appearance as the added gray infrared shielding particles.

  Furthermore, as shown in Table 5, 18 parts by weight of urethane resin as a binder is added to 100 parts by weight of each paving material, and the mixture is stirred in a mortar mixer. A rectangular parallelepiped having a size of 10 mm, a length of 100 mm, and a width of 100 mm was molded, cured for one week, and the binder was cured to obtain a paved body of each sample. In addition, even if any sample was processed into the pavement, it was almost gray with the pavement material.

  FIG. 12 shows the results of evaluating the temperature rise suppression effect of the pavement for each sample by the same method as in the first embodiment. The surface temperature after irradiation with infrared rays for 120 minutes was 43 to 47 ° C. and lower than 50 ° C. in all of Examples 2-2 to 2-4, and showed a remarkable heat shielding effect. In addition, although it is a slight difference, the surface temperature after 120 minutes of infrared rays irradiation is so low that the amount of the water previously absorbed by the water absorption polymer is large.

(3) Compressive strength A pavement was produced by the same production method as in Examples 2-2 to 2-4. However, the shape of the pavement was a cylindrical shape having a diameter of 50 mm and a height of 100 mm in order to evaluate the compressive strength. Furthermore, in order to clarify the influence of the water-absorbing polymer, a pavement material containing the same weight part of the core material, the resin, the gray infrared shielding particles and the hollow body as in Examples 2-2 to 2-4 and not containing the water-absorbing polymer. It is produced as Example 1-11 according to Embodiment 1, and further 18 parts by weight of binder is mixed with this pavement material, followed by stirring, and this is a cylindrical pavement according to Examples 2-2 to 2-4 described above. In the same way, a cylindrical pavement having the same shape was obtained.

The obtained pavement was subjected to a compression test in accordance with JIS A 1108. Table 5 shows the compressive strength. Any sample showed a strength of practically no problem if it was a normal use of 0.6 N / mm ² or more. In particular, Examples 2-3 and 2-4 are 1.2 N / mm ² or more despite containing a water-absorbing polymer, that is, 85% or more of Example 1-11, which does not contain a water-absorbing polymer. Showed high strength.

It is sectional drawing of the pavement material structure particle 100 which comprises the pavement material concerning Embodiment 1 of this invention. It is sectional drawing of the pavement material structure particle 200 which comprises another pavement material concerning Embodiment 1 of this invention. It is sectional drawing of the pavement material structure particle 300 which comprises the pavement material concerning Embodiment 2 of this invention. It is sectional drawing of the paving material constituent particle 300 in a state where the water-absorbing polymer has discharged water. It is an enlarged view of the A section of FIG. It is sectional drawing of the pavement material structure particle 400 which comprises another pavement material concerning Embodiment 2 of this invention. It is sectional drawing of the pavement material structure particle 500 which comprises another pavement material concerning Embodiment 2 of this invention. It is a graph which shows the surface temperature measurement result of the paving body concerning Examples 1-1 and 1-2 and Comparative Examples 1-1 and 1-2. It is a graph which shows the surface temperature measurement result of the pavement concerning Examples 1-3 to 1-7 and Comparative Example 1-3. It is a graph which shows the surface temperature measurement result of the pavement concerning Examples 1-8 to 1-10. It is a graph which shows the surface temperature measurement result of the pavement concerning Example 2-1, and Comparative Example 2-1. It is a graph which shows the surface temperature measurement result of the pavement concerning Examples 2-2 to 2-4.

Explanation of symbols

1 core material, 2 resin, 3 hollow body, 4 water-absorbing polymer, 5 infrared shielding particle, 10 cell, 100, 200, 300, 400, 500 pavement material constituting particle

Claims (11)

An aggregate of a plurality of particles, each of which is a core material, a white first infrared shielding particle having a diameter of 0.4 to 3.0 μm, and a diameter of 0 , disposed on the outer periphery of the core material via a resin. And a second infrared shielding particle having a color other than white of 4 to 3.0 μm . The pavement material according to claim 1, wherein the first infrared shielding particles include titanium oxide. The pavement material according to claim 1, wherein the second infrared shielding particles contain iron oxide .   The pavement material according to any one of claims 1 to 3, wherein the core material is a rubber material.   The pavement material according to claim 4, wherein the rubber material is waste tire pulverized material.   The pavement material according to claim 1, wherein the resin includes a hollow body.   A pavement comprising the pavement according to any one of claims 1 to 6. A method for producing a pavement material in which each particle is an aggregate of a plurality of particles having a core material,
Surrounding the core with resin,
A first infrared shielding particle having a diameter of 0.4 to 3.0 μm and white, and a second color having a diameter of 0.4 to 3.0 μm and a color other than white are provided on the outer periphery of the outer core material through the resin . A method for producing a paving material, comprising a step of fixing the infrared shielding particles .   The method for producing a paving material according to claim 8, wherein the resin is a urethane resin.   The method for manufacturing a pavement according to claim 8 or 9, wherein the core material is a rubber material.   The method for producing a pavement material according to any one of claims 8 to 10, further comprising a step of causing the resin to contain a hollow body.

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