JPH0227003A - Construction method for surface layer of track and field sports stadium, multipurpose play-ground, or the like - Google Patents

Abstract

PURPOSE:To facilitate the construction of the surface layer of an athletic sports ground by jetting, while stirring, polyurethane prepolymer, curing agent, reaction accelerator, inorganic filler, and granular rubber chips, so that they can be sprayed on the surface of an elastic paving material layer. CONSTITUTION:A spraying material composition is stirred which has viscosity of 3000 to 30000CPS and TI of 1.2 to 4, and whose main components are polyurethance prepolymer consisting of polymeric polyol and organic polyisocynate and having at least two free isocyanate group; curing agent consisting of at least one of polymeric polyol, aromatic diamine, and aliphatic diamine; reaction accelerator; inorganic filler; and granular rubber chips whose mean grain diameter of 53 to 100% by weight is 1 to 6mm. Then, it is sprayed on the surface of an elastic paving material layer 5, and is hardened. Thus, an athletic sports ground having a high sliding resistance and abrasion resistance can be easily constructed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to athletic fields (all-weather, indoor, etc.), multipurpose sports fields (schoolyards and gardens that also serve as playing fields, jogging paths, tennis courts, volleyball courts, basketball poles, etc.). courts, handball courts, badminton courts, etc.)
This invention relates to a construction method for forming a surface layer.

In detail, it has excellent non-slip properties (slip resistance), abrasion resistance, resistance to detachment of chips protruding from the surface, and usability (feel when driving or exercising), and is easy to install, repair, and remove dirt. The present invention relates to an improved construction method that is simple and easy and can easily form the above-mentioned surface layer (for stadiums, athletic fields, etc.).

Below is a blank space (conventional π phase) Conventionally, it is well known that anti-slip processing is applied to the pavement surface of track and field stadiums, athletic fields, etc., in order to adapt to the competition or exercise concerned.

However, Japanese Patent Publication No. 61-37402 (page 1) describes a method (Japanese Patent Publication No. 526540) in which chips (made of synthetic resin) are scattered and hardened before the pavement surface hardens. Because the adhesive strength of the chips is weak, they tend to peel off easily, and in addition, chips of unspecified shapes are exposed and attached to the pavement surface, causing dirt to accumulate at the roots of the chips. It is easy to get stuck, and it is difficult to clean the dirt, so it is delivered that the paved surface becomes dirty quickly. It is also well known that chips attached by this method tend to slide around some corners of stadiums, etc., as the chips move during driving because they are not sufficiently fixed.

The method described in JP-A-57-165505 involves scattering and adhering chips in the same manner as the above-mentioned method, and then applying 44 coats of two-component curing polyurethane to the surface of the chips to form a paving surface. By forming a polyurethane coating layer on the surface as well, it is possible to achieve improved effects such as prevention of peeling of the previous chip and prevention of dust accumulation on the root portion of the chip and the chip surface (easy cleaning).

However, this improved paving method still has the disadvantage of having to collect the excess chips after dispersing the chips, and it also requires a lot of spraying steps to form a coating layer, which is time-consuming and takes a long time. However, it also has the disadvantage of increasing costs.

Furthermore, in this method, when the surface is worn out and requires repair, the process must be carried out from the step of scraping off the surface layer and then attaching chips, and repair is not easy.

An even more difficult problem is that it takes a lot of skill to know when to spread the chips, and if the liquid-curing urethane paving material hardens too much, the chips will not adhere to the pavement (Japanese Patent Application Laid-Open No. 1983-1999). (See page 1 of Publication No. 106126).

On the other hand, polyurethane foam chips are mixed on the pavement surface (
A method of spray painting a two-component curing type polyurethane composition containing
No. 6), even if it is sprayed smoothly, the polyurethane foam depth has poor mechanical properties (low abrasion resistance, low strength and elongation, and softness). Since the amount of foam chips is relatively small (2 to 30% by weight based on the resin solid content), the surface finishing layer of the pavement has low wear resistance against spikes, low chip detachment resistance, and low slip resistance. They are also unable to improve their sexual performance to a satisfactory degree.

Moreover, in the Shingan used for this method,
The viscosity of the spray material in the cup (7 in Figure 7) is 300
In the case of a low viscosity of 0 to 8000 CPS (20°C), the rubber chips and inorganic fillers with high specific gravity will separate from the liquid urethane (two-component curing type) and settle down over time, so the spraying material The concentration of chips inside changes and tends to form an inhomogeneous surface layer, which requires manual stirring many times, which is time-consuming, and the sprayed material falls under its own weight, causing it to fall near the injection port. The flow rate is relatively small, so the spraying efficiency is low and the work efficiency (approximately 20
rr? /hour) is also lower than that of the spray machine described later (FIG. 6) (approximately 250rr?/hour). In addition, high viscosity (
], 0000 CP S or more) or the TI value is 3 or more, it will be difficult to fall or flow due to its own weight, and the discharge amount will not be constant.
Spraying tends to be difficult.

(Problems to be Solved by the Invention) In order to solve all the difficulties of the prior art, the present inventors have
As a result of intensive research, when adopting the configuration described below, (1) the spraying material composition has appropriate thixotropic properties (structural viscosity) (TI value of 12 to 4);
Even in the case of high viscosity (10,000 to 30,000 CPS),
The shear force (
Shear), the viscosity decreases moderately and it flows smoothly (flowing), and the compressed air (propulsive force)
sprayed evenly onto the surface of the workpiece. After spraying, the viscosity increases rapidly to thicken the surface coating of the rubber chip and contribute to strong adhesion and fixation to the substrate.

(2) In this case, the flow using the pump can increase the amount of liquid fed, improve the spraying efficiency, and shorten the work.

(3) The sprayed composition smoothly promotes the curing reaction, and the generated elastic polyurethane coats and protects the protrusion surface of each rubber chip with a thick film, and fills the root gap of the chip and troughs ( It forms the bottom surface of the recess (recess) and the wall surface, and is also firmly adhered to the surface of the base (elastic paving material layer).

(4) The surface layer of the present invention having such a structure and form has non-slip properties (slip resistance), wear resistance, resistance to detachment of chips protruding from the surface, and feeling of use (during running or exercise). It should be easy to install, repair, remove dirt, etc.

Based on these findings, we have arrived at the present invention.

A first object of the present invention is to provide an improved method for easily forming the surface layer (for stadiums, sports fields, etc.) as detailed in the technical field (introduction). It is.

A second object of the present invention is to provide an improved surface layer in which the above-mentioned excellent surface layer is formed on various elastic paving material layers described below.
-Providing construction methods for stadiums and multipurpose sports fields.

Means for Solving Problem C) In order to achieve the above-mentioned object, the present invention consists of a polymeric polyol and an organic polyisocyanate-1.
! Hikone having two or more 2-isocyanate groups,
at least one curing agent, a reaction accelerator, an inorganic filler, and 53 to 180% by weight (wt% is based on the total weight of the prepolymer and curing agent specified in n1j) of substantially non-porous and average particles. It contains granular rubber chips with a diameter of 1 to 6 mm as the main component, and has a viscosity (at 20°C) of 3000 to 3000.
0 CPS, thixotropy index (TI) 12
The spraying material composition of ~4 is sent near the injection port (nozzle) of the spray gun with a pump while stirring, and is sprayed onto the surface of the elastic paving material layer formed on the foundation by the driving force of compressed air. Then, a surface layer on which the granular rubber chips protrude is formed, and then the surface layer is cured three times.

Hereinafter, embodiments of the present invention will be explained in detail.

The high-molecular polyol that can be used in the present invention is a high-molecular compound (polymer) that can react with an organic polyisocyanate and has two or more hydroxyl groups, such as ethylene glycol, propylene glycol, etc. diol, or trimedylolpropane, glycerin,
A triol such as hegyzantriol is phase-polymerized with an alkylene oxide such as ethylene oxide, propylene oxide, or trimethylene oxide.
or more, and has an average molecular H400 to 4.00
0 polyalkylene needle polyol, known polyester polyol, acrylic polyol (acnol copolymer having two or more free hydroxyl groups, such as β
- Hydroxyl group-containing monomers such as hydroxyl (meth)acrylate-1 and β-hydroxypropyl (meth)acrylate; monomers that can provide hard polymers such as SM and methacrylic acid ester; and carboxylic acid groups such as (meth)acrylic acid. A copolymer with a containing monomer is preferable, for example, Hilotite 3001.300'4.3006 manufactured by Hitachi Chemical.
, Lasdrazol A-801, A30 manufactured by Dainippon Ink
2. A305A807. etc.), but are not limited to these.

Further, the above-mentioned aromatic polyisocyanate is one having two or more isocyanate groups in the molecule, for example, l
4-phenylene diisocyanate, 2 4-h lylene diisocyanate 726 tolylene diisocyanate, l 5
-naphthalene diisocyanate, 44'-methylene-bis(phenylisocyanate), cumene-24 diisocyanate-1 and mixtures of two or more thereof.

Examples of the above-mentioned aromatic diamines include methylenebisorthochloroaniline, 2,2'-dichlorobencinine, and 13-bisaminonulbenzene. Preferred examples include m-tolylenediamine. Examples of the aliphatic diamine include ethylene diamine, propylene diamine, hexamethylene diamine, and 1,2-propylene diamine. However, it is not limited to these.

Further, as the polyurethane prepolymer having two or more free isocyanate groups, for example, a polyether urethane prepolymer or an acrylic urethane prepolymer has 20 to 90% by weight of a polyether urethane prepolymer having three or more free isocyanate groups. Alternatively, a mixture of an acrylic urethane polymer and a polyether urethane prepolymer or an acrylic urethane prepolymer having 10 to 80% by weight of two free isocyanate groups is particularly preferred. Polyurethane and polyureaurethane derived from these prepolymers have a high degree of crosslinking and are excellent in strength, elasticity, heat resistance, and the like.

As the reaction accelerator, organic metal salts such as lead octylate, tin quinylate, and sibutyldinlaure-1, and tertiary amines such as triethylenediamine are used. The amount used is preferably 0.01 to 1% by weight.

Inorganic fillers that can be blended and used in elastic paving materials include, for example, heavy calcium carbonate, aluminum hydroxide, silica, higher fatty acid metal salts (salts, potassium salts, calcium salts). , magnesium salt, aluminum salt), etc., is preferable. Especially high class. The amount used is usually 10-50% by weight.
It is.

In addition to the above-mentioned essential components, the spray composition of the present invention may optionally contain organic solvents (aromatic solvents such as toluene and xylene, and compounds that are non-reactive with isocyanate groups such as acetic acid alkyl esters). ), weathering stabilizer 0, coloring pigments, light stabilizers, plasticizers, and other commonly used additive components can be blended.

As the granular rubber chips, polyurethane, polyureaurethane, ethylene-propylene rubber (EPG), ethylene-propylene-diene copolymer rubber (EPDM), etc. are particularly preferred. In addition, chloropre, rubber 7 nitrile-butadiene rubber, styrene-buxene rubber, vulcanized product of natural rubber, crushed product of old tires, etc. can also be used. Its average particle diameter is 1 to 6 mm. ], if it is less than 6 mm, the non-slip and abrasion resistance will be poor, and if it exceeds 6 mm, the spike-resistant chip will have poor detachment resistance, which is not preferable.

Furthermore, although granular rubber chips are substantially non-porous, common sense means that they are not porous (sponge-like), and the presence of a few pores or cracks is acceptable. Further, granular rubber chips having an inorganic filler dispersed inside are preferable because they have good mechanical properties. The amount of granular rubber chips used is 53 to 180% by weight as described above. If it is less than 53% by weight, the non-slip property will be poor, and if it exceeds 180% by weight, it will be poor in wear resistance and chip detachment resistance, which is not preferable.

If the viscosity (at 20°C) of the spraying material is less than 3000CPS or the TI value is less than 12, the non-snopping property (9ml) and the chip detachment resistance will be poor and the viscosity will be less than 30000CPS.
If it exceeds S or if the TI value exceeds 4, wear resistance, chip detachment resistance, etc. will deteriorate, which is not preferable.

In order to adjust the TI value within a predetermined range, it is desirable to add calcium carbonate whose surface has been treated with higher fatty acids, higher alcohols, higher fatty acid metal salts, etc., and liquid thixotropic agents (known ones). Calcium carbonate (supra) surface-treated with a metal salt of a higher fatty acid is most preferred.

On the other hand, when the granular rubber chips are polyureaurethane containing an inorganic filler phase and the spray material composition containing the rubber chips contains aromatic diamine and/or aliphatic diamine, It is preferable because it can form a surface layer with excellent resistance to detachment, abrasion resistance, heat resistance, etc. of the rubber chip.

The above-mentioned spraying material composition may be prepared in advance, or the spraying material components may be mixed and prepared in a material container of a spraying machine as shown in FIG.

While being stirred by the stirring screw (1), the spraying material composition having the above-mentioned structure is delivered near (in front of) the injection port (8) of the spray gun (7) according to the direction of the arrow by the pump (3).
The driving force of the compressed air flow (6) (pressure is usually 3
-7 Kg/cm2) is sprayed from the injection port onto the surface of the elastic paving material layer. In this case, since the spraying material composition used in the present invention has the above-mentioned specific thixotropy index value (structural viscosity), the viscosity decreases moderately and greatly even at high viscosity when subjected to shear force due to stirring,
Moreover, the rubber chips can be smoothly sprayed in a uniformly dispersed state. In addition, the flow using a pump increases the amount of liquid sent,
The spraying efficiency can be increased and the working time can be significantly shortened.

Another feature of the present invention is that the spraying machine as shown in FIG. 6 is well adapted to the characteristics of the spray material composition of the present invention and can exhibit useful and significant effects.

The spraying amount of the spraying material composition is preferably within a range that satisfies the following formula (1).

F-cho≦SQ≦1■x3,5 −・(1) However, SQ
Spraying amount (Kg/m21d, average particle diameter of the granular rubber chips used (mm)) In addition, the protrusions of the granular rubber chips formed by spraying on the surface of the elastic paving material layer were rolled with a roller equipped with a wire mesh to the extent that they would not be buried. When the rubber chip is dried and cured, the root part of the rubber chip goes deeper into the polyurethane elastomer layer, and the peeling resistance and spike resistance of the rubber chip can be further improved.

Next, as a preferable elastic paving material layer, (11) a form in which an inorganic filler exists in a dispersed state inside a polyurethane resin layer (inorganic filler-containing polyurethane resin layer).

(2) A polyurethane resin layer in which substantially non-porous or porous elastic chips and an inorganic filler coexist in a dispersed state.

(3) Substantially non-porous or porous elastic chips are adhered to each other by a binder attached to their surfaces and form a layer, and the non-adhered portions between the elastic chips are A structure that forms voids (water-permeable elastic chip layer).

(4) A device comprising the above-mentioned water-permeable elastic chip layer and the above-mentioned inorganic filler-containing polyurethane resin layer adhered to the elastic chips arranged on the surface thereof.

(5) Plate-shaped molded synthetic rubber.

Note that the elastic paving material layer in (1) above is as shown in FIG. 1 and Example 1.
This structure is a cured product of a two-part curable polyurethane composition as used in the spray material of the present invention.

The elastic paving material layer in (2) above includes substantially non-porous or porous elastic chips (rubber chips made from waste automobile tires, urethane chips, polyethylene chips, etc.) in the elastic paving material in (1) above. Depth, polypropylene chip, polyvinyl chloride chip, cork, polyurethane foam chip,
This is a structure in which ethylene-vinyl acetate copolymer foam chips, foamed polystyrene chips, etc.) exist in a dispersed state.

The elastic paving material layer of (3) above is shown in FIG. 5 and Example 12,
Japanese Patent Publication No. 62-21922, Japanese Patent Publication No. 52-1342
This is a water-permeable elastic pavement body as shown in Publication No. 35.

The elastic paving material layer of (4) above is used in Section 3, Example 11, Japanese Patent Publication No. 56-24043, Japanese Patent Publication No. 5734424, Japanese Patent Publication No. 57-43709, Japanese Patent Publication No. 57-4
This is a structure as shown in Japanese Patent No. 4785.

The elastic paving material layer (5) above is a plate-shaped molded synthetic rubber as shown in Example 14, and the synthetic rubber includes polyurethane, polyureaurethane, polychloroprene, and ethylene-propylene diene. Polymerized rubber (EPDM)
), styrene-butadiene rubber, nitrile-butadiene rubber, and the like.

(Example) Examples will be described below. In addition, parts shown in Examples mean parts by weight, and % means weight %.

In addition, the slip resistance coefficient (C3R value), wear resistance,
Test methods and evaluation methods for chip detachment, dirt and ease of removal, ease of spraying, ease of repair, viscosity, and thixotropy index (TI value) are as follows.

(1) Viscosity (unit: CPS) It was measured using a BH type rotational viscometer at a rotation speed of 2 Orpm and a sample temperature of 20°C.

(2) Measuring method of thixotropy index (TI value) Using a BH type rotational viscometer, at a sample temperature of 20°C,
The viscosity at a rotation speed of Zrp and 2 Orpm was measured, and the TI value was determined from the following formula.

Viscosity at 2 Orpm (CPS) (3) Abrasion resistance ① The spike resistance test was carried out by the method described on page 8 of JP-A-62-37403. That is, using the test device shown in Figure 5 on page 10 of this publication, a load of 20 kg was used.
The abrasion loss when the spike bottle was rubbed against the sample 1000 times was measured, and the spike resistance was determined from the degree.

■The wear-resistant wheel test was conducted according to JIS-7204, with the wear wheel being C5-17 and the load being 1 kg.
It is shown as the wear loss after 00 rotations.

(4) Chip detachment resistance Based on the above spike resistance or wear resistance test results, the degree of chip detachment was visually observed, and those with a small amount of detached chips were marked as ○, and those with a slightly large amount of detached chips were marked as △. Items with a very large number of items were evaluated as ×.

(5) Measurement of slip resistance coefficient (C3R) In order to evaluate the non-slip property,
``Method for measuring slip resistance coefficient'' described on page 3 of No. 59
According to , instead of the sole of the tennis shoe, the slippery piece
CSR (Co
efficient of 5lip Re5ista
nce) was measured and the (2,3) value was displayed. In the case of the spiked shoes mentioned above, please see below.

C5R value Evaluation less than 0.8 Easy to slip 0°8~1.3 No slip (appropriate value) 1.3
For jogging shoes that are too slippery, see below.

C3R value Evaluation less than 0.6 Slippery 0.6-0.8 Non-slip (appropriate value) 0.8
In the case of the above-mentioned spiked shoes, the surface layer for track and field stadiums was evaluated, and in the case of jogging shoes, the surface layer for multi-purpose exercise was evaluated.

(6) Ease of removing dirt Adhering dirt caused by dust, etc. can be removed by washing with water (spraying water).
If it is easy to remove, it is marked as easy, and if it is difficult, it is marked as difficult.

(7) Workability of spraying construction In order to evaluate the difficulty of spraying construction, a spraying test was conducted by five experienced spray painters, and if there was no scattering of granular rubber chips in the surface finishing material, a score of 4, If there was a little amount, it was given 3 points; if there was a little amount, it was given 2 points; if there was a lot, it was given 1 point; the total score was used for evaluation (expression).

(8) Ease of repair After grinding the surface layer of the central part (5Q cm x 50 cm space) of the 1M specimen, a skilled construction engineer can perform the surface finishing on that part, repair it, and make the work easier. If it is easy, it is indicated as O5, if it is somewhat difficult, it is indicated as △, and if it is extremely difficult, it is indicated as ×.

Example 1 ■Construction of 1 layer of elastic paving material (5 in Figure 1) A layer of 1:3 of acrylic resin emulsion and Portland cement was applied on top of the dense-grained asphalt concrete that had been cast as a base for an athletic stadium. Primer treatment was performed by applying polymer cement mixed in a weight ratio, and after about 10 hours, an epoxy resin-based water-based primer was applied. Next, about 1
After 0 hours, the following polyurethane prepolymer (A)
A mixture of curing agent composition (B) and the following curing agent composition (B) in a weight ratio of 1:2 was applied onto the primer layer and allowed to naturally harden to form an elastic paving material layer (filler-containing polyurethane resin) with a thickness of 10 mm. formed.

■1 Surface layer construction according to the present invention (1) Polyurethane prepolymer used (^) Excess amount of tolylene diisocyanate (2. 4/2・
Curing agent composition (B) using polyurethane polymer (2) with a terminal isocyanate group content of 3.0% obtained by addition reaction of 6-80/20) by a conventional method 3.5 parts, 20 parts of polyoxypropylene glycol with an average molecular weight of 2000,
25 parts of polyoxypropylene triol with an average molecular weight of 4000, 30 parts of dioctyl phthalate, 110 parts of heavy calcium carbonate, 6.5 parts of red iron, 2.5 parts of lead octylate (reaction accelerator), and 2.5 parts of a weathering stabilizer. C25) (A composition obtained by mixing 2).

(3) Granular rubber chips used: 7 parts of methylenebisorthochloroaniline, average molecular weight: 4
000 polyoxypropylene triol 12 parts, dioctyl phthalate 20 parts 2 heavy calcium carbonate 54 parts,
4 parts of Hengara, 0.5 parts of lead octylate and 2 parts of weathering stabilizer
．． A composition prepared by mixing 5 parts of the curing agent composition (C) and the polyurethane prepolymer (A) at a weight ratio of 1:1 is put into a hat and cured, and the cured product is obtained. Granular urethane rubber chips (hengara color) with an average particle size of 3 mm obtained by pulverizing.

(4) Surface layer construction by spraying of the present invention 50 parts of the polyurethane prepolymer (A) of the above (1) and the above (2)
) 50 parts of curing agent composition (C), 60 parts of non-porous granular urethane rubber chips (black color), 6 parts of calcium carbonate fine powder surface-treated with calcium stearate (thixotropy imparting agent), toluene. A spraying machine (Structure Matic, manufactured by Elasthau, Arena, West Germany)
5100E) and continued stirring by rotating the stirring screw. next,
To start spraying construction, operate the air compressor 00) and liquid feed pump (3), and turn on the bypass cock (
12) was opened and closed, and the amount of liquid fed (amount of material to be sprayed) and pressure of compressed air were adjusted to perform trial blowing of the material to be sprayed. Then, under the determined spraying conditions, it is uniformly sprayed onto the surface of the elastic paving material layer (5 in Figure 1) and left to harden naturally. In this case, the spray (=Jsu+, 1 (4)) in the container is stirred by the stirring screw and the liquid feeding pump (3), and flows through the liquid feeding hose 03 in the direction of the arrow, and the injection port ( 8), and due to the driving force of the compressed air sent from the air compressor, the amount of spraying from the injection port (8) to the surface of the elastic paving material layer (5) is 3.5 kg/n (3.5 kg/n). The surface layer (the upper part of the granular rubber chips (6) is protruding and the lower part (root) thereof is for forming polyurethane) is sprayed as shown in FIG. A surface (2 g layer) was formed which was embedded in the layer of the component.

The viscosity of the spraying material at the start of spraying is 6000CP.
S,,TI value is 1.8 and viscosity when spraying is completed is 80
00CPS, T, T value was 1.9, compressed air pressure was approximately 5 kg/crA.

After spraying, leave it as it is, and after about 10 hours, the reaction (curing reaction) between the polyurethane prepolymer and the curing agent component in the spraying material is completed, and it is completely cured, leaving a surface layer with a thickness of about 3 mm ( 81 has been completed.

In the completed surface layer, as shown in Figure 1, the elastic polyurethane produced by the curing reaction covers (adheres) and protects the protruding surface of each rubber chip, forming each recess (valley), and the elastic paving material. It was strongly adhered to the surface of the polyurethane layer (polyurethane layer of the same quality). This was confirmed by the fact that the layers (5 and 8) did not peel off in the spike resistance test.

Next, as mentioned above, various tests were conducted on the specimen with this surface layer, and the spike resistance test showed that the amount of wear was Log, and the amount of detachment (peeling M) of surface chips was small. Veri resistance value (C3R value) is 1.12,
It had excellent non-slip properties, spike resistance, and chip detachment resistance. Furthermore, as a result of running tests (usage tests), there was no risk of skidding and the running feeling was good. Furthermore, even after one year of construction, there was little dirt and grime, and it was easily removed by washing with water. Furthermore, the result regarding the ease of spraying construction (total score) was 17 points, and it was reported that there was little splashing of the granular rubber chips and the construction was carried out easily (smoothly). It was also found that repair of the surface layer was simple and easy.

Example 2 (1) Construction of the elastic paving material layer (5 in Figure 2) I of Example 1
Composition 100, which was prepared by mixing the polyurethane prepolymer (A) and curing agent composition (B) used in Example 1 at a weight ratio of 1:2, was applied to the surface of the buimer layer (1b) constructed in the same manner as above.
A mixture of 7 parts of foamed polyurethane chips (3 in Figure 2) with an average particle diameter of 21 (3 in Figure 2) was cast onto the 10 mm thick mixture, and the mixture was naturally hardened to give elasticity. A base layer (2 in Figure 2) was formed.

Next, a mixture of the polyurethane prepolymer ~ (8) used in Example 1 and the curing agent composition (B) (weight ratio 1:2) was poured onto the surface of this elastic base layer to a thickness of 2 mm. The mixture was spread and naturally cured to form an intermediate coating layer (4 in FIG. 2).

(2) Surface construction by spraying of the present invention On the surface of the intermediate coating layer applied in (1) above, spraying is performed in the same manner as H-+41 in Example 1 to form a surface layer (8 in Figure 2). did.

The viscosity and Go value of the sprayed material at the start and end of spraying were the same as in Example 1.

Next, as a result of various tests on the constructed surface layer, the slip resistance value (C3R) was 1.14. The amount of wear for spike resistance is 10g, the amount of chip detachment is small (○), dirt can be easily removed by washing with water, the ease of spraying is 17 points, repair is easy (○), and the usability is good. Met.

Examples 3 and 4 and Comparative Examples 1 and 2 The same procedure as Example 2 was carried out except that the amount of granular rubber chips was changed as follows. The results are shown in Table 1.

1st table field j3 Prostitute? f! +l! 14 Upward request column 1
Amount of granular rubber chips in row 2 (%)
53 180 40 200 Viscosity of spray material (CPS) 4000
TI value of 20000 3500 28000〃 1.5 2.0 1.2
2.0 Slip resistance value (C5R) 1
．． 10 1.15 0.70 0.8
5 Spike resistance (g) 15
25 15 40 chip detachment resistance ○ ○ ○
× ease of construction ω number) 16
14 10 B repair α・
○ ○ △
×As is clear from these results, if the blending amount of granular rubber chips is less than 53% by weight, the non-slibbing property will be poor, and if it exceeds 180% by weight, the spike resistance (wear resistance) and chip detachment resistance will be poor. Inferior, construction and repair become difficult.

Examples 5-6. Comparative Examples 3 to 4 The same procedure as in Example 2 was carried out except that the viscosity and TI value of the spraying material were changed as described below.

The results are shown in Table 2.

In Example 5, the amount of toluene used was 30 parts. In Example 6, the amount of calcium carbonate surface-treated with calcium stearate was 20 parts, and 20 parts of heavy calcium carbonate was added, and toluene was not used.

In Comparative Example 3, the amount of toluene used was 35 parts.

In Comparative Example 4, the amount of heavy calcium carbonate was 30 parts, the amount of calcium carbonate surface-treated with calcium stearate was 25 parts, and toluene was not used.

Viscosity of sprayed material (CPS) TI value Slip resistance value (C5R) Spike resistance (g) Chip detachment resistance Table 2 □15 □16 1.2 4.0 1.10 1.14 11 p Ikuri 3 11 Puken Kumi [4141,14,
5 0,780,85 × × Ease of construction (,!a 16 1
5 12 10 Ease of repair
O○ △ × As is clear from the results in Table 2, when the viscosity is less than 3000 CPS or the TI value is less than 1.2, the non-slip property, spike resistance, and chip detachment resistance are poor, and when the viscosity exceeds 30000 CPS, the If the TI value exceeds 4.0, the spike resistance and chip detachment resistance will deteriorate, and construction and repair will become difficult.

Examples 7-8. Comparative Examples 5 to 6 The same procedure as in Example 2 was conducted except that the average particle diameter of the granular rubber chips was changed as described below. The results are shown in Table 3.

Table 3 Broth carp 7 1.2 m18 Hi U5 Kasu Higashi 2 gauze 1165
0.5 8 5.0 1.0 7.0 1.22 1.4 0.75 0.550.5
- Q, 3 Average particle diameter of rubber chips (mm) Amount of sprayed material (kg/%) 5R-1 5R-2 Abrasion resistance -1 (g) Abrasion resistance -2 (g) t'2h"+ Chip JMI resistance of ○ ○
○ × Ease of construction (score)
17 16 1.1
10 Ease of repair ○
○ △ ×In addition, the above C3R~1
For C3R-2, spiked shoes were used for the sliding pieces, and for C3R-2, jogging shoes were used for the sliding pieces. Further, wear resistance -1 is spike resistance, and wear resistance -2 is wear loss due to worn wheels. As is clear from the results in Table 3, if the average particle diameter of the rubber chips is less than 1 mm, the non-slip properties and abrasion resistance will be poor even in multi-purpose playgrounds, and if it exceeds 6 mm,
It has poor spike resistance and chip detachment resistance, and is difficult to install and repair.

Examples 9-10. Comparative Examples 7 to 8 The same procedure as in Example 2 was carried out except that the amount of spraying material was changed as described below. The results are shown in Table 4.

Table 4 11i119 'j Shikoh i Kanofuri 1j10 Zaisu 7 1] ko1 cho ≧ Iku 118 Spraying amount of spraying material (kg/n() 1.7 6.0 1.
2 6.5 Slip resistance value (C5R)
0.95 1.16 0.75
0.70 Spike resistance (g)
15 18 40 35
Chip detachment resistance ○ ○
△ ○ Ease of construction ω Stiffness
16 17 12 1
0 Ease of repair ○ ○
△ × From the results in Table 4, it is clear that the spraying amount of the spraying material is the lower limit value determined by the following formula (1) (the average particle diameter of the chips is 3 mm in Example 2).
If it is less than 1.7 kg/rrr), the non-slip property and spike resistance will be poor, and if it exceeds the upper limit (6.0 kg/g if the average particle diameter of the chip is 3 mm as in Example 2), The chips are completely buried in the polyurethane layer and there are almost no surface protrusions (this results in a surface layer that has poor non-slip properties and is prone to skidding, making it impractical as a stadium or multi-purpose sports field). easy.

a≦SQ≦ l×3.5 ・・・・・・・・・ (
1) However, SQ: Spraying amount (kg / I) d: Average particle diameter of rubber chips (mm) Example 11 A polyurethane primer was applied on open-grained asphalt concrete poured as a base for an athletics stadium, Subsequently, a mixture of 100 parts of SBR rubber chips (No. 10 in Figure 3) with an average particle size of 2 mm and 25 parts of a toluene solution of a one-component moisture-curing urethane (a toluene solution M9 of a prepolymer having 7% free isocyanate groups) was paved to a thickness of 10 mm. did.

On this layer, 30 parts of calcium carbonate surface-treated with sodium stearate was added to a mixture of the polyurethane prepolymer (A) and curing agent composition (B) used in Example 1 at a weight ratio of 1:2. In addition, it was sealed with a two-component curing urethane imparted with thixotropic properties, and the polyurethane prepolymer (A) and curing agent composition (B) were further sealed.
The mixture was cast to a thickness of 2 mm and allowed to naturally harden to form an intermediate coating layer (4).

Next, a spraying material was sprayed on this intermediate coating layer in the same manner as in Example 1 (n-+4), and the material was naturally cured.
A surface layer was formed. The viscosity of this spray material is 600
0CPS/20℃, TI value is 1.8, and slip resistance value (CS R) is 1.15. Spike resistance is 25g, chip detachment resistance is ○, dirt is easy to remove, ease of construction is 16 points, repair is easy and the usability is good, and thus the spraying construction according to the present invention was carried out. The surface layer in Figure 3 (8
) also has excellent non-slip properties, spike resistance, and chip detachment resistance, and is easy to spray and repair.

Example 12 A diphenymethane diisocyanate-based urethane primer (1b) was sprayed at 0.3 kg/m onto open-grained asphalt that had been cast as a base for an athletics stadium, followed by a one-component moisture-curing urethane binder (-N CO group content 7%
> 10 mm thick layer (5) of a mixture of +9125 parts and 0100 parts of SBR rubber chimp a with an average particle size of 2 mm.
It was paved. After about 10 hours, 100 parts of the mixture (1:1 by weight) of the polyurethane prepolymer (A) and curing agent composition (B) used in Example 1 and 1 mm of average particle size made from the same material were added. A composition (viscosity 25,000 CPS/20
℃, TI value is 4) and 2 kg in the same manner as in (4) of Example 1.
/rd amount to form a surface layer (5th layer) with a thickness of approximately 1 mm.
8) in the figure was formed. The resistance value (C3R) of this surface layer due to jogging shoes is 0.75. Amount of wear due to worn wheels is 0.6g, chip detachment resistance is good (○)
The ease of construction received a score of 14, indicating that it is easy to repair (○), feels good in use, and maintains the water permeability of the underlying elastic pavement.

It is also useful as a multipurpose playground.

Example 13 In Example 2, except that the intermediate coating layer (4) was not applied,
The same procedure as in Example 2 was carried out. A schematic diagram of this construction cross section is shown in Figure 4. The spike resistance of the surface layer (8) is 15g, the slip resistance value (C3R) is 1.15, the chip detachment resistance is ○, dirt is easy to remove, and the ease of installation is 16
On the other hand, the repair was easy and the usability was good. The viscosity of the spraying material is eooooCPs/20'C, and the TI value is 1.
．． It was 8.

Example 14 Rubber adhesive was applied to dense asphalt concrete poured as a foundation for an athletics stadium to a thickness of 10 m.
After adhering the plate-shaped molded product having chloroprene rubber as the main component (m), a spraying material was sprayed thereon in the same manner as in (4) of Example 1, and the material was allowed to harden naturally to form a surface layer.

The slip resistance value (C3R) of this surface layer is 1.15, the spike resistance is l1g, the chip detachment resistance is good (O), dirt is easy to remove, the ease of construction is 18 points, and the repair is easy. The feeling of use was also good.6 The viscosity and TI value of the sprayed material were the same as in Example 1.

Example 15 The same procedure as in Example 2 was conducted except that ethylene-propylene-diene copolymer rubber (EPDM) chips (average particle size: 2 mm) were used as the granular rubber chips. Slip resistance value of the obtained surface layer (C5R
) is 1.13, spike resistance is 18g, chip detachment resistance is ○, dirt is easy to remove, ease of construction is 15 points, repair is easy and the usability is good.

Example 16 Ten minutes after spraying the spray material in Example 2, a linear pressure of 0.1 k was applied using a roller equipped with a wire mesh.
The same procedure as in Example 2 was conducted except that the chip surface of the uncured surface layer was rolled under the condition of g/cm and then allowed to harden naturally.

The uniform resistance value (CSR) of the formed surface layer was 0.85.
, spike resistance (5g) and chip detachment resistance are further improved compared to Example 2, dirt is easy to remove, ease of construction is 17 points, repair is easy, and the usability is also good. It was good.

Example 17 The same procedure was followed except that instead of the polyurethane prepolymer (A) used in Example 1, an acrylic urethane polymer having a terminal isocyanate group derived from an acrylic polyol (100 hydroxyl groups) and tolylene diisoanate was used. The above-mentioned surface layer was formed in the same manner as in Example 1. The slip resistance (II(C3R)) of the obtained surface layer was 1.10
, spike resistance is 12g, chip detachment resistance is good (○
), dirt removal was easy, ease of construction was 17 points, repair was easy, and the usability was good.

Comparative Example q In Example 2, instead of spraying, three sprayed G-shaped materials were used.
The same procedure as in Example 2 was carried out except that the casting was carried out using a squeegee so that the weight was 5 Kg/m2. The slip resistance value (C3R) of this surface layer varies widely from 06 to 0.85, and the non-slip property is extremely low, and the spike resistance is also 3.
It was inferior at 5g. Also, during installation, the rubber chips were dragged by the squeegee and were not distributed evenly, so we tried to correct the distribution using a trowel, but it was extremely difficult to install.

(42 Comparative Examples IO In n-(4,) of Example 1, instead of 60 parts of granular urethane rubber (non-porous), the average particle size was 0.
．． The above-described surface layer was formed in the same manner except that 12 parts of 8 mm polyurethane foam particles were used. The slip resistance value (C3R) of this surface layer is 0.6, the spike resistance is 170 g, and the chip detachment resistance is X. It had poor separation properties and was impractical as an athletics stadium or multipurpose sports field.

[Brief explanation of the drawing]

1 to 5 are schematic diagrams of the cross-sectional structure of the pavement structure of the present invention. 1... Base, la... Base treatment, lb... Primer 2... Elastic base layer, 3... Elastic body chip, 4...
Intermediate coating layer 5... Elastic paving material layer, 6... Granular rubber chips, 7... Polyurethane, 8... Surface layer, 9...
Binder, 10...Rubber chip, 11...Void,
12...Filling layer FIG. 6 is a conceptual diagram of the spraying machine of the present invention. 1... Stirring screw, 2... Shaft, 3...
Flow pump, 4... Spraying material, 5... Liquid flow of spraying material, 6... Compressed air flow, 7... Spray gun 8... Spout nozzle, 9... Motor, 10...
Compressor 11... bypass hose, 12...
Cock, 13...liquid feeding hose, 14...air hose, 15...spraying material container FIG. 7 is a conceptual diagram of a conventional spraying machine. DESCRIPTION OF SYMBOLS 1... Spraying material, 2... Spraying material outflow amount adjustment knob, 3... Spraying phase outflow amount adjustment valve, 4... Liquid flow of spraying material, 5... Compressed air flow, 6...
Spout nozzle, 7... Spraying material cup, 8... Air boss 9... Compressor

Claims (11)

[Claims] (1) A polyurethane prepolymer having two or more free isocyanate groups, consisting of a polymeric polyol and an organic polyisocyanate, and at least one curing agent selected from the group of polymeric polyols, aromatic diamines, and aliphatic diamines. , a reaction accelerator, an inorganic filler, 53
~180% by weight (weight% is based on the total weight of the prepolymer and curing agent) that is substantially non-porous and has an average particle size of 1
A spraying material composition containing granular rubber chips of ~6 mm as a main component, a viscosity (at 20° C.) of 3,000 to 30,000 CPS, and a thixotropy index (TI) of 1.2 to 4 was sprayed with a pump while stirring. The compressed air is sent near the injection port (nozzle) and sprayed onto the surface of the elastic paving material layer formed on the base using the driving force of the compressed air, forming a surface layer with protruding granular rubber chips, and leaving it as it is. A construction method for the surface layer of track and field stadiums and multipurpose sports fields, which is characterized by hardening. (2) The spraying amount of the spraying material composition is determined by the following formula (1
) is within the range that satisfies claim No. (
Construction method described in section 1). √d≦SQ≦√d×3.5・・・・・・・・・・・・(1
) However, SQ: Spraying amount (Kg/m^2) d: Average particle diameter of the granular rubber chips used (mm) (3) At least one of the polymer polyols constituting the polyurethane prepolymer and the polymer polyol of the curing agent has an average molecular weight of 400 to
4000 polyalkylene ether polyol or acrylic polyol. (4) the granular rubber chips contain an inorganic filler;
The construction method according to claim (1), which is polyurea urethane, polyurethane, or ethylene-propylene-diene copolymer rubber (EPDM). (5) Claim (1), wherein the spray material composition contains an aromatic diamine as a curing agent component, and the granular rubber chips are polyureaurethane containing an inorganic filler. construction method (6) The protrusions of the granular rubber chips formed by spraying on the surface of the elastic paving material layer are rolled with a roller equipped with a wire mesh to an extent that they will not be buried, and then cured as they are, as described in claim (1). construction method. (7) Claim No. 1, wherein the elastic paving material layer is in a form in which an inorganic filler exists in a dispersed state inside a polyurethane resin layer (inorganic filler-containing-polyurethane resin layer). Construction method described in section. (8) Claims in which the elastic paving material layer is of a form in which substantially non-porous or porous elastic chips and an inorganic filler coexist in a dispersed state inside the polyurethane resin layer. Construction method described in paragraph (1). (9) The elastic paving material layer has substantially non-porous or porous elastic chips adhered to each other by a binder attached to the surface thereof to form a layer, and the elastic chips The non-adhesive portion between them is a structure (water-permeable elastic chip layer) forming a void.
Construction method described in ). (10) A patent in which the elastic paving material layer is comprised of the water-permeable elastic chip layer described above and the inorganic filler-containing polyurethane resin layer adhered to the elastic chips arranged on the surface thereof. A construction method according to claim (1). (11) The construction method according to claim (1), wherein the elastic paving material layer is a plate-shaped molded body of synthetic rubber.