JP2006214096A - Method for finishing surface of elastic pavement body for sports - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for finishing a surface of an elastic pavement body for sports, which enables an antislip effect and a heat-shield/heat-insulating effect to be maintained over a long period of time, and which uses a paint friendly to both people and the environment. <P>SOLUTION: The surface of the elastic pavement body for sports is coated with the paint containing a water base paint composition, non-porous polymer beads, hollow beads and a heat-shield pigment. Thus, a surface-finished layer randomly protruded from the surface is formed in a state wherein the non-porous polymer beads and the hollow beads are at least partially coated with the water base paint composition. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for finishing a surface of an elastic pavement for sports such as an all-weather urethane track, a jogging track, a multipurpose playground, a tennis court, and a park.

  The surface of sports elastic pavements used in athletic fields, jogging tracks, multipurpose sports fields, etc. has been conventionally finished to give appropriate motion performance and anti-slip effect. It has been proposed to further improve the performance by adjusting.

For example, Patent Document 1 discloses a method of applying slippage when wet by applying a paint containing a fine hollow sphere of alumina silicate to a polyurethane material having thixotropy on a resin pavement surface made of polyurethane resin having an uneven finish. A finishing method that provides more resistance is disclosed. Further, for example, Patent Document 2 discloses a finishing method for applying a heat-shielding and heat-insulating effect to a pavement surface by applying an acrylic-modified paint containing organic micro hollow spheres to the resin pavement surface having an uneven finish. It is disclosed.
Japanese Patent No. 2666484 JP 2004-156347 A

  Recently, sick house syndrome in the construction field and the like has become a social problem, and the reduction of volatile organic compounds (VOC), which is one of the causes, has been strongly demanded. In response, the Ministry of Education, Culture, Sports, Science and Technology and the Ministry of Land, Infrastructure, Transport and Tourism, etc. have issued regulations on indoors, but countermeasures in all fields are urgently required, not limited to the construction field.

  Therefore, paints widely used at construction sites in the construction and civil engineering fields, of course, have a tendency to shift from solvent-based to water-based paints, and the development of water-based paints that are not inferior in performance to solvent-based paints is strong. It is desired. However, the solvent-based paint is applied to the surface of the elastic pavement that has been constructed in many sports facilities, and the paint described in Patent Document 1 is also solvent-based and compatible with the environment. Not done. Moreover, in the above-mentioned Patent Document 1, since the micro hollow sphere contained in the paint is brittle in physical properties and structure, it tends to wear out early due to external pressure due to sports shoes or spikes during competition, as a pavement It has been pointed out that the anti-slip effect as the main point is not sustained due to its poor durability. Also, in summer, the temperature of the elastic pavement surface may reach 60 ° C or higher, and the grounding temperature is high, and cooling measures such as temporary sprinkling may be taken. Accumulating this can cause significant damage to the player's motor function.

  On the other hand, according to the method described in Patent Document 2, the organic micro-hollow spheres contained in the paint can be integrated with the paint resin even if a certain heat shielding / heat insulating effect is obtained in the surface layer. Because it is scarce and structurally hollow and relatively fragile, it is easy for them to wear out or detach at an early stage due to the external pressure of sports shoes or spikes. There is a problem that only persists.

  Therefore, there is a demand for a method for finishing the surface of an elastic pavement that is a construction method using a safe paint that does not contain VOC, and that has an excellent anti-slip effect and heat insulation / heat insulation effect over a long period of time. In fact, such a method has not yet been established.

  The present invention has been made in view of such circumstances, and can provide an anti-slip effect and a heat-shielding / heat-insulating effect over a long period of time, and can also be used for an elastic pavement for sports using a paint that is friendly to the environment and people. Its purpose is to provide a surface finishing method.

  In order to achieve the above-mentioned object, the present invention applies the above-mentioned coating composition containing a water-based coating composition, nonporous polymer beads, hollow beads, and a heat-shielding pigment to the surface of an elastic pavement for sports. A method for finishing a surface of an elastic pavement for sports in which at least a part of non-porous polymer beads and hollow beads are coated with an aqueous coating composition to form a surface finish layer randomly protruding from the surface. This is the first gist.

In addition, the present invention includes, in particular, the surface of an elastic pavement for sports, in which the aqueous coating composition is a two-component aqueous urethane polymer and contains the following components A and B: The finishing method is the second gist.
(A) An aqueous polyol component in which a polymer having a plurality of hydroxyl groups and at least one of a carboxylic acid group and a sulfonic acid group is prepared in at least one of a state dissolved in water and a state dispersed in water.
(B) An organic polyisocyanate component which is present in the aqueous polyol component A in an emulsified form, has a viscosity of about 50 to 10,000 mPa · s at 23 ° C., and has a plurality of isocyanate groups.

  And among these, especially this invention is the finishing method of the elastic pavement surface for sports in which the said nonporous polymer bead is contained in the ratio of 5-100 weight part with respect to 100 weight part of hollow beads. A fourth gist is a method for finishing a surface of an elastic pavement for sports, in which the water-based coating composition contains an anti-algae / anti-mold agent.

  That is, the present inventors use a water-based resin paint instead of a solvent-based paint on the surface of an elastic pavement for sports, and have a surface finish capable of maintaining an anti-slip effect and a heat-insulating / insulating effect over a long period of time. As a result of earnest research on the method to be performed, when a finish layer is formed on the surface of an elastic pavement for sports with a paint containing a water-based paint composition, nonporous polymer beads, hollow beads, and a thermal barrier pigment, The action of the coated non-porous polymer beads makes it difficult for the hollow beads contained in the surface finish layer to come off, and at the same time, prevents the paint film containing the heat-shielding pigment from being worn or peeled off, so that it can slip for a long time. It is possible to maintain the effect of stopping and insulating / insulating heat, and because it uses water-based paint composition, it has been found to be safe and friendly to the environment and people. It has been reached.

  In the present invention, in particular, when a special coating composition composed of a two-component aqueous urethane polymer containing the A component and the B component is used, the workability is excellent and a more excellent surface finish layer is obtained. Among them, in particular, when a paint in which the content ratio of the nonporous polymer beads and the hollow beads is set in a predetermined range is used, the uniform dispersibility of both in the paint is further improved, Excellent durability performance can be exhibited in an economically considered category.

  In addition, the use of paints that contain algae / antifungal agents combined with the high durability of this surface finish layer makes it possible to create a beautiful exterior elastic pavement that does not produce algae or wrinkles over a long period of time. Has the advantage of being able to provide a body.

  Next, the best mode for carrying out the present invention will be described.

  The method for finishing the surface of an elastic pavement for sports according to the present invention comprises applying a paint containing an aqueous coating composition, nonporous polymer beads, hollow beads, and a heat shielding pigment to the surface of an elastic pavement for sports. In this method, a surface finish layer that randomly protrudes from the surface is formed in a state in which at least a part of the nonporous polymer beads and the hollow beads are coated with the aqueous coating composition.

  The aqueous coating composition is an aqueous system prepared in a state where the polymer component of the coating is dissolved in water (including the case where a small part of water is replaced with a solvent compatible with water, the same applies hereinafter). Water or water as a solvent or dispersion medium, such as emulsions prepared with the polymer component of the paint dispersed in water, or those prepared with the polymer aqueous solution and emulsion mixed. It refers to a coating composition. Since these water-based coating compositions contain no or very little VOC as described above, they are friendly to the environment and people at the time of on-site construction where the paint is applied.

  The water-based paint composition is not particularly limited, but since it is used for finishing the surface of an elastic pavement, it is desirable that the coating film has flexibility to follow this. What uses the urethane polymer by which the hydrophilic property was improved by introduction | transduction of a carboxylic acid group or a sulfonic acid group as a polymer component is suitable. In the present invention, the carboxylic acid group and the sulfonic acid group are intended to include cases where they are in the form of salts or esters.

Preferable examples of the water-based coating composition containing the above-mentioned hydrophilic polyurethane as a polymer component include, for example, a two-component water-based urethane polymer containing the following component A and component B, specifically: Is preferably a two-component paint composition described in JP-B-8-32851.
(A) An aqueous polyol component in which a polymer having a plurality of hydroxyl groups and at least one of a carboxylic acid group and a sulfonic acid group is prepared in at least one of a state dissolved in water and a state dispersed in water.
(B) An organic polyisocyanate component which is present in the aqueous polyol component A in an emulsified form, has a viscosity of about 50 to 10,000 mPa · s at 23 ° C., and has a plurality of isocyanate groups.

  Further, the water-based paint composition used in the present invention is not limited to the above examples, and various water-based paint compositions such as a water-based acrylic-modified resin paint, a water-based urethane-modified resin paint, and an acrylic silicon-modified resin paint are exemplified. And as a suitable commercial item, SBU NYW (made by Sumika Bayer Urethane Co., Ltd.) which is a water-based acrylic modified resin coating material is mentioned.

  In addition, the nonporous polymer beads of the present invention used together with the above-mentioned aqueous coating composition are granular materials made of an organic polymer, and are artificially manufactured even if they are made of natural polymers existing in nature. It may be. And what was shape | molded in granularity without making it foaming intentionally or forming a hole is called "non-porous." Therefore, there is no problem even if small holes or cracks occur spontaneously.

  The material of the nonporous polymer beads is not particularly limited. For example, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, polyethylene, polyvinyl acetate copolymer, polycarbonate, polystyrene copolymer Examples include coal, polypropylene, polyvinyl ether, polyamide, copolymerized polyamide, polyester, copolymerized polyester, phenoxy resin, polyisoprene, polyurethane, thermoplastic elastomer, and the like used as hot melt adhesives. Of these, copolymerized polyamide and copolymerized polyester are preferably used because of their high adhesive strength with aqueous coating compositions.

  Moreover, it is preferable to set the compounding quantity of the said nonporous polymer bead in the range of 5-100 parts with respect to the below-mentioned hollow bead 100 weight part (henceforth "part") used with this. That is, if the blending amount of the nonporous polymer beads is less than 5 parts, the effectiveness of maintaining the anti-slip effect and the heat insulation / heat insulation effect over a long period of time becomes poor, and if it exceeds 100 parts, the heat insulation / heat insulation is not achieved. It tends to lead to a decrease in effectiveness.

  The hollow beads of the present invention used together with the nonporous polymer beads generally have names such as “micro hollow spheres” or “balloons”. Depending on the material, inorganic beads and organic beads are used. Two are widely known, but any of them may be used. Moreover, you may mix and use both. Since the hollow beads have a small specific gravity and excellent heat insulating properties and are spherical, the water-based coating composition can be highly filled.

  Among the hollow beads, inorganic hollow beads include, for example, glass beads, silica beads, shirasu beads, alumina beads, zirconia beads, aluminosilicate beads, and the like. Particularly preferred is an aluminosilicate bead. Those having a particle diameter set in the range of 0.01 to 1.00 mm are preferred, and those having a particle diameter in the range of 0.02 to 0.50 mm are particularly preferred. That is, when the average particle diameter of the hollow beads is less than 0.01 mm, the viscosity of the composition becomes high due to the filling into the aqueous coating composition, and the high heat filling cannot be performed and the heat insulating property may be lowered. On the other hand, when the average particle diameter of the hollow beads exceeds 1.00 mm, the strength of the coating film decreases due to high filling, which is not preferable. The specific gravity is preferably from 0.3 to 1.5, and particularly preferably from 0.5 to 1.2. If it is less than 0.3, it is difficult to obtain sufficient balloon strength, and if it exceeds 1.5, the heat insulating property is lowered, which is not preferable. And the filling amount with respect to an aqueous coating composition has the preferable range of 1-10%, and the range of 2-8% is suitable especially.

  Examples of the organic hollow beads include polymer beads such as vinylidene chloride resin, acrylonitrile resin, methyl methacrylate resin, and phenol resin, and those having an average particle diameter of 0.003 to 0.10 mm are particularly preferable. Is from 0.008 to 0.09 mm. The specific gravity is preferably in the range of 0.02 to 0.20, more preferably 0.02 to 0.15. When the particle diameter is less than 0.003 mm, the heat shielding and heat insulating effects are undesirably lowered, and when it exceeds 0.10 mm, the stability of the coating film is impaired. And the filling amount with respect to a water-based coating composition has the preferable range of 0.5-5%, and the range of 1-3% is especially suitable.

  Furthermore, the heat-shielding pigment used in the present invention is not particularly limited with respect to the material and type, but the evaluation standard of JIS R3106 “Testing method of transmittance, reflectance, emissivity, and solar heat gain of plate glass” Unless the wavelength of the near infrared region is specified as 750 to 2100 nm and the spectral reflectance in that region is 5% or more, the heat shielding effect must be achieved. Don't be. More preferably, 10% or more of pigment is used. In addition, the measurement conditions of the said spectral reflectance are as follows.

[Measurement conditions of spectral reflectance]
Sample: According to the evaluation standard of JIS R3106 “Testing method of transmittance, reflectance, emissivity, and solar heat gain of plate glass”, a composition in which 30% of a pigment is blended with melamine alkyd resin is 10 mil (0. A sample having a thickness of 01 mm) and dried is used as a sample.
Measuring instrument: Spectrophotometer (330 type, manufactured by Hitachi, Ltd.)
Measurement conditions: wavelength range 400-2500 nm
Light source: D light source

  As such a heat-shielding pigment, for example, 0.01 to 100% of an azo organic pigment, 1 to 100% of rutin-type titanium oxide, and 0.01 to 100% of a metal compound such as titanium are blended. A composite pigment is preferred. And it is suitable for the compounding quantity of the said heat-shielding pigment to set to 0.5 to 30.0% with respect to an aqueous coating composition, More preferably, it is 0.5 to 10.0%. That is, if it is less than 0.5%, the heat shielding and heat insulating effect in the surface finish layer obtained may be insufficient. Conversely, if it exceeds 30.0%, no further effect can be obtained. This is because it is no longer an economic category.

  In addition to the water-based coating composition, nonporous polymer beads, hollow beads, and heat-shielding pigment, various additives are added to the coating material used in the present invention in order to give a higher added value to the surface finish layer. Can be blended. Examples of the additive include an antialgae / antifungal agent, a flame retardant, a deterioration inhibitor, and the like. When these additives are blended and used, the durability of the surface finish layer obtained by the finishing method of the present invention is very excellent. Play.

  Examples of the algae / antifungal agents generally include organic nitrogen compounds, organic halogen compounds, benzimidazole compounds, organic iodine compounds, organic nitrogen sulfur compounds, triazine compounds, and the like. It is preferable to use a chemical substance that is soluble in the water-based coating composition used in the above and does not extremely adversely affect the environment. For example, a mixed compound of organic nitrogen halogen type and benzimidazole type is suitable. Such an anti-algae / anti-mold agent is preferably added to the paint in an amount of 0.1 to 3%, especially 1 to 2%.

Further, thixotropic properties can be imparted to the paint used in the present invention if desired. Examples of the modifier for imparting thixotropy include calcium carbonate surface-treated with higher fatty acids, higher alcohols, higher fatty acid metal salts, and the like, and known thixotropic agents such as SiO _2. Calcium carbonate surface-treated with a fatty acid metal salt is preferred.

  In the present invention, a paint having the above-mentioned special composition is applied to the surface of an elastic pavement for sports with an appropriate thickness to form a surface finish layer, and at least a part of the nonporous polymer beads and hollow beads are This is a method for finishing the surface of an elastic pavement for sports, which is randomly projected from the surface in a state where it is coated with a water-based paint composition.

  The above-mentioned sports elastic pavement may be any conventionally known elastic pavement laid on an all-weather urethane track, jogging track, multipurpose playground, tennis court, park or the like. Examples thereof include polyurethane resins and other synthetic resins, or elastic granular materials bonded and agglomerated and solidified with these resins, such as elastic pavements made of polyurethane, EPDM, natural rubber, synthetic rubber, and the like.

The coating method for the paint is not particularly limited, and examples thereof include spray coating, roller brush coating, brush brush coating, and the like. Further, the coating amount is preferably set in the range of 0.05 to 1.0 kg per 1 m ² of the surface of the elastic pavement material layer, particularly preferably in the range of 0.1 to 0.7 kg. That is, when the coating amount is less than 0.05 kg / m ² , the coating film is too thin and the nonporous polymer beads and the hollow beads may easily fall off. Conversely, the coating amount is 1.0 kg / m ^2. This is because if it exceeds m ² , the coating film is too thick and the original physical properties of the elastic pavement as a base may be impaired.

  The elastic pavement for sports having a surface finish layer formed in this manner has a surface finish layer formed of a paint containing a water-based paint composition, nonporous polymer beads, hollow beads, and a heat shielding pigment. Because of the action of the non-porous polymer beads coated with paint resin, the hollow beads contained in this layer are difficult to separate, and at the same time, it suppresses abrasion and peeling of the coating film containing the heat-shielding pigment. The anti-slip effect and the heat-insulating / insulating effect will last. Moreover, since the water-based paint composition is used, it is safe for the environment and for humans.

  Examples of the present invention will be described below together with comparative examples.

[Examples 1-8]
<Preparation of Sample 1>
First, an excess of tolylene diisocyanate (2,4 adduct / 2,6 adduct = 80/20) relative to polyoxypropylene glycol (average molecular weight 2,000) and polyoxypropylene triol (average molecular weight 5,000). Was reacted by a conventional method to prepare a prepolymer having a terminal isocyanate group (—NCO) content of about 3.0%. Also, 36 parts of a liquid polyol / polyamine containing methylenebisorthochloroaniline, polyoxypropylene glycol (average molecular weight 3,000) and polyoxypropylene triol (average molecular weight 5,000), 4 parts of pigment, 57 parts of calcium carbonate, A curing agent containing a terminal active hydrogen group (—H) consisting of 1 part of a reaction accelerator and 2 parts of a weathering stabilizer was prepared. And the said prepolymer and hardening | curing agent were mixed in the ratio of NCO / H equivalence ratio about 1.1, and the base elastic pavement of thickness of 300x300x1.2cm was produced. Then, the surface of the base elastic pavement, a material obtained by blending a thixotropic agent as a main component the above prepolymer and a curing agent and SiO ₂ was applied to the embossed by a spray method, an average height of about 0 An elastic pavement surface with 2 cm irregularities was formed.

And on the surface of the above-mentioned elastic pavement, it is nonporous with a blending ratio shown in Table 1 below to a two-component acrylic modified aqueous urethane polymer (SBU NYW, manufactured by Sumika Bayer Urethane Co., Ltd./solid content of about 50%). Polymer beads (copolymerized polyamide beads, average particle size 0.2 mm, specific gravity 1.08), hollow beads (Philite FG, manufactured by Nippon Philite Co., Ltd./inorganic micro hollow spheres) and thermal barrier pigments (thermal barrier toning pigments, oriental paints) Kogyo Co., Ltd.) and an anti-algae / anti-mold agent (antibacterial / algae-control agent, manufactured by Oriental Paint Industry Co., Ltd.) are prepared, and an airless spray machine is applied so that the applied amount is 0.3 kg / m ^2. It was applied evenly. And this was hardened at room temperature (23 degreeC, 60% RH), and eight types of samples 1 (Examples 1-8 goods) in which the surface finish layer by this invention was formed were obtained.

<Preparation of Sample 2>
Further, the prepolymer and the curing agent were mixed at an NCO / H equivalent ratio of about 1.1 to prepare a base elastic pavement having a thickness of 300 × 300 × 0.2 cm. Then, the embossed coating as in the sample 1 is not performed, and the same surface finishing layer as that in the case of the sample 1 is formed on the flat surface of the base elastic pavement. Examples 1 to 8 were obtained.

[Comparative Examples 1-4]
In the same manner as in the above Examples 1 to 8, four types of samples 1 and 2 (Comparative Examples 1 to 4) were prepared. However, as a coating material used for the surface finish layer, hollow beads 1 are mixed in a two-component type acrylic urethane coating material (Topcoat GS, manufactured by Taisei E.L, solid content 50%) at a blending ratio shown in Table 2 below. (Phylite FG [52/7], manufactured by Nippon Philite) or hollow beads 2 (Expancel DE, manufactured by Nippon Philite) was used.

  Using these samples 1 and 2, the wet slip resistance value, wear mass, and bead durability (estimated detachment rate, estimated residual rate, duration coefficient of imparting effect) of each example product and comparative product were measured. These results are also shown in Tables 1 and 2 below. In addition, the measuring method of each item is as showing below.

[Slip resistance when wet]
With respect to each finished surface layer of Sample 1, the wet skid resistance value of the surface was measured using a portable skid resistance measuring instrument defined in ASTME-303-74.

[Wear mass]
For each finished surface layer of sample 2, the wear mass X of the surface was measured using a Taber abrasion tester (wear wheel CS-17, 1 kg load, 1000 rotations) defined in JIS K7204.

[Durability of beads]
First, the amount of loss Y in a state where each finished surface layer of sample 2 (coating amount 0.3 kg / m ² ) was worn 100% was calculated. Then, using this value Y and the value X measured in the item [Wear mass], the estimated detachment amount P of the hollow beads was calculated according to the following formula 1. Moreover, the estimated residual amount Q was calculated according to the following formula 2, and the sustainability coefficient R of the effect imparted according to the following formula 3 was calculated, thereby estimating the long-term sustainability of the effect.

  From the above results, the estimated detachment amount of beads imparting anti-slip and heat-shielding / heat-insulating effects of the products of Examples 1 to 8 is about ½ that of the products of Comparative Examples 1 to 4, and the sustaining coefficient of the application effect Is about 3 times. These effects are obtained by combining non-porous polymer beads and hollow beads, and it can be seen that the anti-slip effect and the heat shield effect by the finished surface layer can be maintained well over a long period of time.

Example 9
A paint having the same composition as in Example 3 was used as the paint for forming the surface finish layer. However, by selecting the color of the heat-shielding pigment, paints of three different colors of brick color, green color, and blue color are prepared, and the samples 1 of Examples 1 to 8 are prepared using the respective paints. Three types of samples 3 to 5 having different surface finish layer colors were prepared in the same manner as the case of preparation.

Example 10
A paint having the same composition as in Example 6 was used as a paint for forming the surface finish layer. Other than that was carried out similarly to the said Example 9, and produced three types of samples 3-5 in which the color of a surface finish layer differs.

[Comparative Example 5]
A sample having an elastic pavement surface was prepared in the same manner as in the case of preparing Sample 1 of Examples 1-8. However, the surface finish layer is not formed thereon, and the surface of the elastic pavement is colored using pigments of three different colors of brick color, green color, and blue color, whereby three types of samples 3 having different colors are obtained. It was set to ~ 5.

[Comparative Example 6]
As a paint for forming the surface finish layer, the conventional two-component acrylic urethane resin-based topcoat paint (SBU NY, manufactured by Sumika Bayer Urethane Co., Ltd./solid content of about 50%), hollow beads (Philite FG, Japan) A paint in which 5.5% of Philite / Inorganic micro hollow sphere) was added and mixed was used. Other than that was carried out similarly to the said Example 9, 10, and produced three types of samples 3-5 from which the color of a surface finish layer differs.

  And these samples 3-5 evaluated the heat insulation and heat insulation in a room | chamber interior, and the heat insulation and heat insulation in the outdoors according to the following method. The results are shown in Tables 3 and 4 below.

[Insulation and heat insulation in the room]
In a room set at a room temperature of 26 ° C., the surfaces of Samples 3 to 5 were irradiated with a 200 W infrared lamp from above 15 cm, and the surface temperature after 10 minutes, 30 minutes, 60 minutes, and 90 minutes from the start of irradiation. (° C.) was measured, and it was evaluated that the lower the surface temperature of Comparative Example 5 (without the surface finish layer), the higher the heat shielding and heat insulating properties.

[Outdoor heat insulation and heat insulation]
On a clear summer day (July 23, 2004) when the outside temperature exceeded 30 ° C., the samples 3 to 5 were left outdoors with their surfaces facing upward. Then, the surface temperature (° C.) was measured every hour after standing, and it was evaluated that the lower the surface temperature of Comparative Example 5 (without the surface finish layer), the higher the heat shielding and heat insulating properties. In addition, the change of the outside air temperature in the outdoors is as follows.
10:30 33 ° C
11:30 35 ° C
13:30 35 ° C
14:30 37 ° C
15:30 35 ° C

  From the above results, it was found that the example product had a remarkable heat shield / heat insulation effect compared to the comparative example product. In addition, there is almost no temperature difference between each color tone (brick color, green color, blue color).

  Furthermore, using the sample 2 in Example 2 and Comparative Example 6, tests on the antialgae / antifungal effect were carried out according to the following method. The results are also shown in Table 5.

[Algae control test]
As a weathering operation, the sample 2 was immersed in 200 ml / sheet of water for 24 hours, and then the room temperature drying operation was performed twice for 24 hours. Then, five kinds of mixed algae of Chlamydomonas reinhardtii, Chlorella vulgalis, Oscillatoria tenuis, Ulothrix variabilis, and Englena gracilis were pasted on the sample surface, and the growth state of the algae after 4 weeks was visually evaluated.

[Anti-mold effect test]
As a weathering operation, the sample 2 was immersed in 200 ml / sheet of water for 24 hours, and then the room temperature drying operation was performed twice for 24 hours. Then, five types of Aspergillus niger, Penicillium funculosm, Cladosporum cladosporoides, Gliocladium virens, and Aureobasidium pullulans were pasted on the sample surface, and the growth state after 4 weeks was visually evaluated.

  From the above results, it can be seen that the example product exhibits an excellent antialgae / antifungal effect as compared with the comparative example product.

Claims (4)

  At least a part of the nonporous polymer beads and the hollow beads is applied to the surface of the elastic pavement for sports by applying a paint containing an aqueous coating composition, nonporous polymer beads, hollow beads, and a heat shielding pigment. A method for finishing a surface of an elastic pavement for sports, wherein a surface finish layer randomly protruding from the surface is formed in a state of being covered with a water-based paint composition. The method for finishing a surface of an elastic pavement for sports according to claim 1, wherein the aqueous coating composition is a two-component aqueous urethane polymer and contains the following components A and B.
(A) An aqueous polyol component in which a polymer having a plurality of hydroxyl groups and at least one of a carboxylic acid group and a sulfonic acid group is prepared in at least one of a state dissolved in water and a state dispersed in water.
(B) An organic polyisocyanate component which is present in the aqueous polyol component A in an emulsified form, has a viscosity of about 50 to 10,000 mPa · s at 23 ° C., and has a plurality of isocyanate groups.   The method for finishing a surface of an elastic pavement for sports according to claim 1 or 2, wherein the nonporous polymer beads are contained in a proportion of 5 to 100 parts by weight with respect to 100 parts by weight of hollow beads.   The method for finishing a surface of an elastic pavement for sports according to any one of claims 1 to 3, wherein the water-based paint composition contains an antialgae / antifungal agent.