JP6871779B2 - Road surface or floor surface display material - Google Patents

Description

The present invention relates to a road surface or floor display material installed on the surface of a road or floor, and more specifically, is installed on the surface of a road or floor so that a printed image can be clearly seen and has excellent resistance. The present invention relates to a slippery road surface or floor surface display material.

The paved road is provided with various road markings such as signs indicating that smoking is prohibited on the road, warnings regarding road traffic, and arrows indicating the direction to the destination. In addition, on the floors of buildings such as factories, stations, and commercial facilities, guidance indicating the positions of escalators and exits, various alerts, logos, patterns, patterns, and other floor markings are provided.

As a conventional technique for road marking and floor marking, for example, in Patent Document 1, a translucent aggregate is fixed with a synthetic resin binder, and the binder contains short fibers and a phosphorescent material. The structure is disclosed. Such a structure is formed in the shape of an arrow or the like and functions as a guide display, and has an advantage that the surface is not slippery because a part of the aggregate is exposed to form an uneven surface. doing. However, since the road surface structure of Patent Document 1 functions as a guide display or the like by molding itself into a desired shape, it is possible to express complicated shapes, fine characters, figures, patterns, and the like. There was a problem that it could not be done.

As a means for solving such a problem, Patent Document 2 discloses a patterned floor having an undercoat layer, a pattern layer and a surface layer in this order on the base. In the patterned floor of Patent Document 2, a pattern printed on a base material such as paper can be used as a pattern layer, so that a complicated design can be freely expressed.

However, in the patterned floor of Patent Document 2, as a result of making the surface layer transparent and smooth so that people can clearly see the pattern of the pattern layer, the slip resistance is greatly impaired, and pedestrians can use it. There was a problem that it was easy to slip.

Japanese Unexamined Patent Publication No. 2008-215061 No. 54-081629

Therefore, an object of the present invention is to provide a road surface or floor surface display material capable of clearly visually recognizing a printed image and having excellent slip resistance.

According to the present invention, the road surface or floor surface display material is installed on the surface of a road or floor, and the base layer, the printing layer, and the transparent resin layer are provided in this order.
Alumina particles are sprayed and fixed on the surface of the transparent resin layer at ^{an amount of 50 to 500 g / m 2.}
In the alumina particle group, the total content ratio of the small alumina particles having a particle size of 0.1 mm or more and less than 1.0 mm and the large alumina particles having a particle size of 1.0 to 1.2 mm is 90 to 100% by mass. A characteristic road surface or floor surface display material is provided.

In the alumina particle group, the total content ratio of the small alumina particles and the large alumina particles is 90 to 100% by mass, and the content ratio of the large alumina particles is 10% by mass or less. The material is a preferred embodiment of the present invention.

A road surface or floor surface display material in which a top coat layer is further provided on the alumina particle group sprayed and fixed on the surface of the transparent resin layer is a preferred embodiment of the present invention, and the top coat layer is made of acrylic resin. The road surface or floor surface display material is a more preferable aspect of the present invention.

The road surface or floor surface display material in which the transparent resin layer is made of acrylic resin is a preferred embodiment of the present invention.

In the road surface or floor surface display material of the present invention, the printing layer is covered with a transparent resin layer, and alumina particles are scattered and fixed on the surface of the transparent resin layer. Alumina particles are translucent to white in the air and are not transparent, but surprisingly, they are transparent when buried in a transparent resin layer. The reason why the alumina particles become transparent in this way is not clear, but the present inventors speculate as follows. That is, the alumina particles generally have an angular shape such as a substantially cubic shape. When the alumina particles are irradiated with light from the air, a lot of light is reflected inside the particles, and the reflected light is large and the transmitted light is small. Therefore, the alumina particles are opaque in the air. However, when the alumina particles are partially embedded in the transparent resin, the proportion of light reflected inside the alumina particles decreases, and the proportion of transmitted light that goes out into the air increases instead. Therefore, in the present invention, the alumina particles are sprayed and fixed on the transparent resin layer to obtain slip resistance, and at the same time, the printed image under the transparent resin layer can be clearly visually recognized.

Moreover, in the present invention, the transparent resin for forming the transparent resin layer can be freely selected in order to make the above-mentioned alumina particles transparent. More specifically, in light of the conventional wisdom of those skilled in the art, alumina particles sprayed and fixed on a layer made of a transparent resin (for example, acrylic resin) having a large difference in refractive index from alumina (refractive index: about 1.79). It was completely unthinkable to make it transparent. However, as a result of repeated studies by the present inventors and others, it is extremely surprising that even if a transparent resin having a large difference in refractive index such as acrylic resin is adopted, the alumina particles become transparent. It became clear. Therefore, in the present invention, a resin having a large difference in refractive index from alumina may be used, or a transparent resin having a small difference in refractive index may be used, that is, the transparent resin can be freely used according to the application environment of the display material and the like. You can choose.

As described above, the road surface or floor surface display material of the present invention has succeeded in achieving both slip resistance and visibility of the printed image by utilizing the phenomenon that the alumina particles sprayed and adhered to the transparent resin layer become transparent. However, in addition, by using a group of alumina particles containing alumina particles of a specific particle size in a specific ratio, it is harsh that people and vehicles such as roads and floors pass through and are exposed to rain and wind. Dirt and peeling of alumina particles are effectively suppressed in a favorable environment, and slip resistance and visibility of a printed image are not impaired.

As described above, the road surface or floor surface display material of the present invention not only obtains slip resistance by spraying and fixing alumina particles on the transparent resin layer, but also utilizes the transparency phenomenon of the alumina particles to print an image. By specifying the particle size and proportion of the alumina particles, the slip resistance and the visibility of the printed image are not impaired by the peeling and dirt of the alumina particles. It has become like.

It is schematic cross-sectional view which shows an example of the structure of the road surface to floor surface display material of this invention.

FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the road surface or floor surface display material of the present invention. As shown in FIG. 1, the road surface to floor surface display material (hereinafter, may be abbreviated as the display material of the present invention) 1 of the present invention is installed on the road or the surface of the floor 2 for use. It is provided and has a base layer 3, a printing layer 4, and a transparent resin layer 5 in this order. Alumina particle group 6 containing alumina particles having a specific particle size in a specific ratio is sprayed and fixed on the surface of the transparent resin layer 5.

<Road or floor 2>
As used herein, "road or floor" means a place where people or vehicles can pass, whether indoors or outdoors. Specific examples include roads, passageways or parking lot floors, building floors (including floors such as balconies, balconies, and rooftops), and treads of stairs. The road or floor is preferably paved with cement concrete, cement mortar, asphalt or the like.

<Underground layer 3>
The base layer 3 is formed by using a known thermosetting resin. Examples of known thermosetting resins include silicone resins, urethane resins, epoxy resins, acrylic resins, unsaturated polyester resins, phenol resins, melamine resins, urea resins, alkyd resins and the like, but from the viewpoint of weather resistance. , Acrylic resin is preferable, and methyl methacrylate resin is particularly preferable. The base layer 3 may have a single-layer structure or a laminated structure.

The base layer 3 is preferably colored according to the color tone of the printed image in the print layer 4 described later. This is because if the base sheet (for example, paper, mesh, etc.) on which the printed image is formed is thin, the color of the base layer 3 affects the color tone of the printed image. In particular, the base layer 3 is preferably white so that the printed image can be visually recognized more clearly. As a means for making the base layer 3 white, for example, a means for blending a white pigment such as titanium oxide can be mentioned. The blending amount of the white pigment in the base layer 3 is usually 5 to 15% by mass.

The base layer 3 may further contain a known additive, if necessary. Known additives include, for example, curing agents, curing aids, lubricants, fillers (silica sand, calcium carbonate, etc.), antioxidants, UV absorbers, viscosity modifiers and the like.

The average thickness of the base layer 3 may be appropriately determined according to the installation environment of the display material of the present invention, but is usually 0.2 to 6.0 mm, preferably 0.3 to 6.0 mm. .. In particular, when the surface of the road or floor 2 is paved with concrete and there is a large amount of unevenness, or when the road or floor 2 is paved with asphalt, the thickness of the base layer 3 may be 2 to 6 mm. preferable. If the base layer 3 is too thin, the display material may be damaged when a high load is applied due to the passage of a large vehicle, for example. Further, if the base layer 3 is too thick, not only the material cost increases, but also the resin floats due to the separation of the synovial fluid, which may cause curing shrinkage and cause cracks in the surface layer.

The base layer 3 is preferably made larger than the print layer 4 described later, and depends on the size of the print layer 4 and the like. For example, when both the base layer and the print layer are quadrangular, the length of each side of the base layer is long. Is preferably made 5 to 15 mm larger than the length of each side of the print layer.

<Print layer 4>
A print layer 4 is provided on the base layer 3. The print layer 4 is a base sheet on which characters, figures, patterns, patterns, and the like are printed. As the base material sheet, a sheet having liquid permeability, specifically, a sheet made of woven fabric, non-woven fabric, paper, mesh or the like is used. Woven fabrics and non-woven fabrics are made of natural fibers such as cotton and silk, synthetic fibers such as polyester and polyamide, and glass fibers. Paper consists of, for example, wood pulp. The mesh is made of a metal such as stainless steel, iron, copper, nickel or titanium. As the base sheet, a woven fabric or a mesh is preferable, and a mesh is particularly preferable.

For printing, a known printing method such as gravure printing, flat plate printing, flexo printing, dry offset printing, pad printing, screen printing, etc. is appropriately selected according to the application of the display material of the present invention and the material of the base sheet. Will be printed. The print layer 4 may have a single-layer structure or a laminated structure.

<Transparent resin layer 5>
In the present invention, the printing layer 4 is covered with the transparent resin layer 5. As described above, the alumina particle group 6 is sprayed and fixed on the transparent resin layer 5, and as a result, the alumina particles constituting the alumina particle group 6 are made transparent.

As the resin for forming the transparent resin layer, a known transparent resin can be used. That is, such as polyurethane resin (general refractive index: 1.49), acrylic resin (general refractive index: 1.49 to 1.53), and fluororesin (general refractive index: 1.35). , A transparent resin having a large difference from the refractive index of alumina (general refractive index: 1.79) may be used, or an unsaturated polyester resin (general refractive index: 1.6), an epoxy resin ( A transparent resin having a small difference in refractive index from alumina, such as general refractive index: 1.55 to 1.61), may be used. As described above, the refractive index of the transparent resin is not limited to this as long as the effect of the present invention is not impaired, but is preferably 1.3 to 1.7 when measured by a method according to JIS K0062-1992. is there.

In addition, in this specification, "transparency" means that the total light transmittance measured according to JIS K 7105 is 90% or more.

As the transparent resin, it is preferable to use an acrylic resin, and it is particularly preferable to use a methyl methacrylate resin, from the viewpoint that the alumina particles are easily made transparent and also have excellent weather resistance and durability.

The transparent resin layer 5 may have a single-layer structure or a laminated structure. Further, the transparent resin layer 5 may contain a known additive such as a curing agent, if necessary.

<Alumina particle group 6>
The alumina particles constituting the alumina particle group 6 are obtained by pulverizing and sizing conventionally known alumina as necessary, regardless of whether it is a single crystal or a polycrystal, under the condition that the effect of the present invention is not impaired. .. From the viewpoint of availability and manufacturing cost, alumina obtained by the acid method; alumina obtained by the Bayer process (alkali method); sintering obtained by granulating, drying, and firing calcined alumina produced by the Bayer process. Alumina; Electro-fused alumina obtained by melting the raw material in an electric furnace and then crystallizing it; White-fused alumina obtained by melting and cooling solidifying the calcined alumina produced by the Bayer process as a raw material; It is preferable to use alumina obtained by vaporizing and oxidizing in (alumina), which is pulverized and sized as necessary, and from the viewpoint of maximizing the effect of the present invention, white fused alumina is used as required. It is particularly preferable to use pulverized and sized particles.

The alumina particle group 6 contains 90 to 100% by mass in total of small alumina particles 6a having a particle size of 0.1 mm or more and less than 1.0 mm and large alumina particles 6b having a particle size of 1.0 to 1.2 mm. The display material of the present invention is applied to a harsh environment such as a road or a floor where people or vehicles pass or is exposed to rain and wind, and the fine alumina particles having a particle size of less than 0.1 mm are used. When a large amount of is sprayed on the transparent resin layer, dirt such as mud is likely to be clogged between the fine alumina particles, while when there are many giant alumina particles having a particle size larger than 1.2 mm, the corners of the giant alumina particles are soiled. Is likely to adhere, and so-called edge stains are likely to occur. As described above, when a large amount of fine alumina particles or giant alumina particles are used, stains are likely to adhere to the surface of the display material of the present invention, whereby the effect of the present invention (visibility and slip resistance of printed images) Is impaired. Further, since the fine alumina particles have few portions exposed to the outside of the transparent resin layer, excessive use of the fine alumina particles leads to a decrease in slip resistance. Furthermore, the giant alumina particles are easily peeled off from the transparent resin layer, which lowers the durability. For this reason, in the present invention, as described above, the alumina particle group 6 containing a large amount of small alumina particles 6a and large alumina particles 6b and having a suppressed content of fine alumina particles and large alumina particles is used. This is very important. From the viewpoint of more effectively preventing fouling, it is preferable to suppress the content of the large alumina particles 6b in the alumina particle group 6 and increase the content of the small alumina particles 6a. Specifically, the small alumina particles The total content ratio of 6a and the large alumina particles 6b is preferably 90 to 100% by mass, and the content ratio of the large alumina particles 6b is preferably 10% by mass or less (including 0%), and in particular, the small alumina particles. It is preferable that the total content ratio of 6a and the large alumina particles 6b is 90 to 100% by mass, and the content ratio of the large alumina particles 6b is 0.1 to 10% by mass. The particle size is measured using, for example, a Tyler standard fluid.

The amount of the alumina particle group 6 sprayed and fixed is 50 to 500 g / m ² , preferably 100 to 350 g / m ² . If the amount of the alumina particle group used is too small, the slip resistance may be insufficient. If the amount of the alumina particle group used is too large, the alumina particles may overlap each other, resulting in a decrease in the amount of light transmitted or an increase in the amount of reflection, which may impair the visibility of the printed image. In addition, dirt may easily be clogged between the alumina particles, and edge dirt may easily accumulate at the corners of the alumina particles.

The shape of the alumina particles constituting the alumina particle group 6 is preferably a shape other than a spherical shape such as a polygonal shape from the viewpoint of controlling the transmission and reflection of light and further improving the slip resistance.

In the present invention, commercially available alumina particles satisfying the above-mentioned content ratios of the small alumina particles and the above-mentioned large alumina particles may be used as they are as the alumina particle group, but two or more kinds of commercially available alumina particles are mixed and the above-mentioned content ratio is used. A group of alumina particles satisfying the above conditions may be adjusted and used. The mixing may be performed in advance prior to production, or may be performed at the production site of the display material of the present invention.

<Top coat layer 7>
In the display material 1 of the present invention, it is preferable to further provide the top coat layer 7 on the alumina particle group 6 which is sprayed and fixed to the transparent resin layer 5 from the viewpoint of preventing the alumina particles from peeling off.

As the resin for forming the top coat layer, the above-mentioned known transparent resin can be used. From the viewpoint of weather resistance, it is preferable to use an acrylic resin, and in particular, a methyl methacrylate resin is preferably used. From the viewpoint of adhesiveness, it is preferable to use a transparent resin of the same type as the transparent resin layer. The top coat layer 7 may contain a known additive such as a curing agent, if necessary, as long as the effects of the present invention are not impaired.

In the resin for forming a top coat layer, the refractive index measured by a method according to JIS K0062-1992 is preferably 1.3 to 1.7 for the same reason as the resin for forming a transparent resin layer.

The top coat layer 7 is preferably provided so that the irregularities derived from the alumina particles sprayed and fixed to the transparent resin layer are not impaired. Specifically, the basis weight is 100 to ^{300 g / m 2} , and particularly 150 to. It is preferable to provide it at 200 g / m ^2.

<Manufacturing method>
The display material of the present invention having the above-mentioned structure is produced by a known method. For example, as a pretreatment, foreign substances such as dust, dust, oil, mud, and water are removed from the surface of the road or the floor 2, and if necessary, dirt and deposits on the surface are further removed. When the surface of the road or the floor 2 is paved with cement concrete or cement mortar, it is preferable to use a surface treatment machine such as Linax or a lane marking remover. When the surface of the road or the floor 2 is paved with asphalt, it is preferable to use a polisher or the like equipped with a wire brush. If there is an old coating film or the like, it is preferable to remove it using a polishing machine or the like. The abrasive powder or the like may be removed by a known means, for example, a vacuum cleaner or the like.

Then, if necessary, a known primer such as an acrylic primer or an epoxy primer is applied. For example, if the road or floor 2 is paved with asphalt, it is not necessary to apply the primer, but if the road or floor 2 is paved with concrete, it is preferable to apply the primer.

Next, in order to form the base layer 3, a resin composition for forming a base layer, which comprises an uncured thermosetting resin and an additive appropriately used if necessary, is applied. When a primer is provided, it is preferable to apply the resin composition for forming an underlayer after confirming that the surface of the primer has solidified. A white pigment or an additive may be blended in the resin composition for forming the base layer. As already described, when the surface of the road or the floor 2 is paved with concrete and has a large amount of unevenness or is paved with asphalt, the thickness of the base layer 3 is preferably 2 to 6 mm. However, in this case, the coating amount of the resin composition for forming the base layer is preferably ^{3.2 to 10.2 kg / m 2.}

After confirming the curing of the resin composition for forming the base layer, a base sheet that has been printed in advance is placed to form the print layer 4.

Next, in order to form the transparent resin layer 5, the base sheet is impregnated with the resin composition for forming a transparent resin layer containing an uncured transparent resin and an additive appropriately used as needed. Apply. The coating amount of the transparent resin layer forming resin composition is preferably ^{200~600g / m 2, 400~500g / m} 2 is particularly preferred. If the coating amount is too small, the transparent resin layer may not be able to firmly hold the alumina particles. If the coating amount is too large, there is a risk of causing cracks in the surface layer due to curing shrinkage due to resin floating.

After the start of curing of the resin composition for forming the transparent resin layer and before complete curing, the alumina particle group 6 is sprayed. The spraying is performed so that the alumina particles are partially embedded in the transparent resin layer 5. When spraying the alumina particle group 6, known aggregates (calcium carbonate, silica sand, glass, ceramics, rubber chips, wood pieces) may be sprayed under the condition that the effect of the present invention is not impaired. , Titanium oxide may be sprayed from the viewpoint of improving antifouling property, or glass beads may be sprayed to impart heat shielding property. These may be sprayed together with the alumina particle group 6, or may be sprayed before and after the spraying of the alumina particle group 6.

The alumina particle group 6 may be sprayed by a known means, for example, by hand-spreading, sieving, spraying lysing gun, or the like. It is preferable that the alumina particle group 6 is uniformly sprayed.

When the topcoat layer 7 is provided, the resin composition for forming the topcoat layer is applied to the surfaces of the transparent resin layer 5 and the alumina particle group 6. The coating amount is preferably 150 to 200 g / m ^2. It is preferable to apply the resin composition for forming the top coat layer after confirming that the transparent resin layer 5 is completely cured.

The above-mentioned primer application, base layer forming resin composition application, transparent resin layer forming resin composition application, and top coat forming resin composition application may be applied to a roller, a brush, a trowel, a spatula, or these. It may be carried out using a similar construction machine.

Further, a known adhesive may be applied between the layers, if necessary.

Depending on the size of the display material of the present invention, the installation environment, etc., the display material 1 of the present invention may be manufactured in advance in the mold instead of directly manufacturing the display material 1 on the road or the floor 2 as described above. Then, a known primer may be applied to the road or the floor 2, and the obtained display material 1 of the present invention may be placed on it.

For example, in the case where the display material 1 of the present invention has a small area, polyethylene is provided around the portion of the road or floor 2 where the display material 1 should be provided prior to the removal of foreign matter from the surface of the road or floor 2. It is advisable to mask with a sex masking film or the like, and further protect it by covering it with a sheet made of polyethylene or the like in order to prevent stains.

<Road surface to floor display material 1>
The road surface or floor surface display material 1 of the present invention thus obtained can clearly recognize a printed image and has excellent slip resistance. The slip resistance is preferably 40 BPN or more (wet condition) in the sidewalk portion and 60 BPN or more (wet condition) in the roadway portion as a value measured by a method based on ASTM E303.

Hereinafter, the present invention will be further described with reference to Examples and Comparative Examples. The technical scope of the present invention is not limited thereto.

<Example 1>
A flat road or a part of the floor (square) of the concrete pavement outdoors is used as the construction surface, the surrounding area of the construction surface is masked, and the area is covered with a sheet to prevent the surrounding area from being soiled. did. Masking was performed by attaching a gum tape. A polyethylene sheet was used as a sheet for preventing contamination.

Next, as a pretreatment, foreign substances such as oils and fats, mud, and water on the construction surface were removed, and dirt and deposits on the surface were further removed. Specifically, the pretreatment was performed using a handy grinder Ultra Disc Sander. Abrasive powder and the like were removed with a vacuum cleaner and the like.

Next, a step of applying a primer was performed. Specifically, 15 g of the curing agent silical BPO (organic peroxide) was added to 500 g of acrylic resin silical MP2 (primer for concrete) manufactured by Mitsui Chemicals Co., Ltd., and 200 g / m ^{2 was} applied using a roller. .. After the primer was surface-hardened, a base layer was prepared with a thickness of 3 mm. Specifically, 200 g of white pigment and 60 g of silical BPO (organic peroxide) are added to 2 kg of silical MC3 (base resin) manufactured by Mitsui Chemicals, Ltd., and further, silical manufactured by Mitsui Chemicals, Ltd. 5 kg of SL (mixed silica sand for sinking self-leveling) was added, and the mixture was stirred to prepare a resin composition for forming an underlayer, which was applied at ^{5.4 kg / m 2 using a trowel.}

After confirming the curing of the base layer, a printing layer and a transparent resin layer were prepared. Each side of the base layer was made larger than the print layer by about 10 mm. The thickness of the print layer was about 0.3 mm. 25 g of silical BPO (organic peroxide) is added to 1 kg of acrylic resin silical MT3 (resin for clear top coat) manufactured by Mitsui Chemicals Co., Ltd. to prepare a resin composition for forming a transparent resin layer and impregnate the printed layer. This was applied at ^{500 g / m 2} while allowing the mixture to be applied.

^{Further, before the resin was cured, 250 g / m 2 of} an alumina particle group containing 100% by mass of small alumina particles having a particle size of 0.1 mm or more and less than 1.0 mm was sprayed. The alumina particles were sprayed by hand and as uniformly as possible. The alumina particles contained in the alumina particle group were all white fused alumina.

After confirming the curing of the transparent resin layer, the resin composition for forming the top coat layer was applied. Specifically, silical BPO (organic peroxide) is added to acrylic resin silical MT3 (resin for clear topcoat) manufactured by Mitsui Chemicals Co., Ltd. to prepare a resin composition for forming a topcoat layer, and a roller is used. This was applied at 150 g / m ^{2 using.} The prepared test body (road surface to floor display material) was evaluated for durability, dirtiness, visibility, and slip resistance.

(durability)
The obtained road surface or floor surface display material was left for 3 months, and the peeled state of the alumina aggregate was visually evaluated.
Evaluation criteria ○: There is almost no peeling.
Δ: Partially peeled part is seen. About 10 to 50% by mass.
X: Alumina of 50% by mass or more is peeled off.

(Dirty)
The obtained road surface or floor surface display material was left to stand for 3 months, and the difference from the unleaved sample was measured with a color difference meter (Konica Minolta color difference meter Color Reader CR-10) to calculate ΔL.
Evaluation Criteria ◯: ΔL value is less than 12 Δ: ΔL value is 12 or more and less than 20 ×: ΔL value is 20 or more

<Example 2>
As an alumina particle group, alumina particles containing 90% by mass of small alumina particles having a particle size of 0.1 mm or more and less than 1.0 mm and 10% by mass of large alumina particles having a particle size of 1.0 mm or more and 1.2 mm or less. A road surface or floor surface display material was prepared in the same manner as in Example 1 except that the group was used. Further, durability and stain resistance were evaluated by the same method as in Example 1. The alumina particles used in this example were all white fused alumina as in the case of Example 1.

<Comparative example 1>
Except for the fact that, as the alumina particle group, an alumina particle group containing 30% by mass of fine alumina particles having a particle size of less than 0.1 mm and 70% by mass of small alumina particles having a particle size of 0.1 mm or more and less than 1.0 mm was used. A road surface or floor surface display material was prepared in the same manner as in Example 1. Further, durability and stain resistance were evaluated by the same method as in Example 1. The alumina particles used in this comparative example were all white fused alumina as in the case of Example 1.

<Comparative example 2>
Except for the fact that the alumina particle group used was an alumina particle group containing 70% by mass of small alumina particles having a particle size of 0.1 mm or more and less than 1.0 mm and 30% by mass of giant alumina particles having a particle size larger than 1.2 mm. A road surface or floor surface display material was prepared in the same manner as in Example 1. Further, durability and stain resistance were evaluated by the same method as in Example 1. The alumina particles used in this comparative example were all white fused alumina as in the case of Example 1.

Table 1 shows the durability / stain resistance evaluation results due to the difference in the particle ratio of the alumina aggregate. The amount of alumina aggregate sprayed is constant at ^{250 g / m 2.} In Examples 1 and 2, the evaluation of durability and stain resistance was good, but as in Comparative Example 1, when there were many fine alumina particles having a particle diameter of less than 0.1 mm, dirt was likely to be clogged between the alumina particles. .. When there are many giant alumina particles having a particle size larger than 1.2 mm as in Comparative Example 2, peeling of the alumina particles and edge stains are likely to accumulate at the corners of the alumina particles.

<Example 3>
As an alumina particle group, alumina particles containing 90% by mass of small alumina particles having a particle size of 0.1 mm or more and less than 1.0 mm and 10% by mass of large alumina particles having a particle size of 1.0 mm or more and 1.2 mm or less. A road surface or floor surface display material was prepared in the same manner as in Example 1 except that the group was used and the amount of the alumina particle group sprayed was 100 g / m ^2. The alumina particles used in this example were all white fused alumina as in the case of Example 1.

Visibility and slip resistance were evaluated by the following methods.
(Visibility)
The visibility of the obtained road surface to floor display material was evaluated according to the following evaluation criteria.
Evaluation criteria ◎: Printing is clearly visible.
◯: Printing is visible.
Δ: Part of the print is difficult to see.
X: The print cannot be seen.

(Slip resistance)
The slip resistance (wet state) of the obtained road surface or floor display material was measured by a method according to ASTM E303.

<Example 4>
A road surface or floor surface display material was prepared in the same manner as in Example 3 except that the amount of the alumina particle group sprayed was 150 g / m ^2. Further, the visibility and slip resistance were evaluated by the same method as in Example 3.

<Example 5>
A road surface or floor surface display material was prepared in the same manner as in Example 3 except that the amount of the alumina particle group sprayed was 200 g / m ^2. Further, the visibility and slip resistance were evaluated by the same method as in Example 3.

<Example 6>
A road surface or floor surface display material was prepared in the same manner as in Example 3 except that the amount of the alumina particle group sprayed was 250 g / m ^2. Further, the visibility and slip resistance were evaluated by the same method as in Example 3.

<Example 7>
A road surface or floor surface display material was prepared in the same manner as in Example 3 except that the amount of the alumina particle group sprayed was 350 g / m ^2. Further, the visibility and slip resistance were evaluated by the same method as in Example 3.

<Example 8>
A road surface or floor surface display material was prepared in the same manner as in Example 3 except that the amount of the alumina particle group sprayed was 500 g / m ^2. Further, the visibility and slip resistance were evaluated by the same method as in Example 3.

<Comparative example 3>
A road surface or floor surface display material was prepared in the same manner as in Example 3 except that the amount of the alumina particle group sprayed was 1000 g / m ^2. Further, the visibility and slip resistance were evaluated by the same method as in Example 3.

<Comparative example 4>
A road surface or floor surface display material was prepared in the same manner as in Example 3 except that the amount of the alumina particle group sprayed was 2000 g / m ^2. Further, the visibility and slip resistance were evaluated by the same method as in Example 3.

Table 2 shows the evaluation results of visibility and slip resistance based on the amount of particles of the alumina aggregate sprayed. As in Examples 3 to 7, the slip resistance can be adjusted by the amount of alumina sprayed.
Further, as shown in Comparative Examples 3 and 4, when the amount of alumina sprayed is 1000 g / m ² , the visibility is lowered, and ^{when the alumina is sprayed up to 2000 g / m 2} , the print becomes invisible.

As described above, the slip resistance can be easily adjusted by the amount of alumina sprayed, and at the same time, excellent visibility can be ensured.

1: Road surface to floor surface display material 2: Road or floor 3: Base layer 4: Printing layer 5: Transparent resin layer 6: Alumina particle group 6a: Small alumina particles 6b: Large alumina particles 7: Top coat layer

Claims (4)

A road surface or floor display material that is installed on the surface of a road or floor and is provided with a base layer, a printing layer, and a transparent resin layer in this order.
Alumina particles are sprayed and fixed on the surface of the transparent resin layer at an amount of 100 to 350 g / m ^2.
In the alumina particle group, the total content ratio of the small alumina particles having a particle size of 0.1 mm or more and less than 1.0 mm and the large alumina particles having a particle size of 1.0 to 1.2 mm is 90 to 100% by mass . A road surface or floor surface display material characterized in that the content ratio of large alumina particles is 0.1 to 10% by mass. The road surface or floor surface display material according to claim 1 , wherein a top coat layer is further provided on the alumina particle group sprayed and fixed on the surface of the transparent resin layer. The road surface or floor surface display material according to claim 2 , wherein the top coat layer is made of an acrylic resin. The road surface or floor surface display material according to any one of claims 1 to 3 , wherein the transparent resin layer is made of an acrylic resin.

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