JPH0396504A - Finish method of elastic paving surface - Google Patents

Abstract

PURPOSE:To make it possible to execute the paving surface having an excellent sense of use without having any sense of disharmony by spraying a substance containing a specific volume of granulated rubber chips having a limited size on an elastic paying material layer to form a surfacing layer. CONSTITUTION:A mixture of polyurethane prepolymer and hardener compound is applied to ground treated asphalt concrete, it is naturally solidified to form an elastic paving material layer 9, granulated rubber chips having a size limited over 0.1mm up to 1.0mm of an average particle diameter are contained 15-100 wt.% against total volume of the polyurethane prepolymer and hardener, viscos ity (20 C) sets 3,000 - 30,000 cps and thixotropy index (TI) to 1.2 - 4 to spray, a surfacing layer 6 is formed, and it is naturally solidified to form a surface layer. A projection and recess surfce having a large number of projections with roundish tops is formed. According to the constitution, during the travelling or in the the event croushing starts, even if fingers touch thereon, a sense of disharmony is eliminated and, at the same time, a paving surface having an excellent sense of use can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a finishing method for elastic pavement surfaces used in athletic stadiums, multi-purpose sports fields, etc. It has excellent abrasion resistance, usability, etc., and is easy to install. This relates to a finishing method that allows for easy repair, dirt removal, etc.

[Conventional technology and its issues]

BACKGROUND ART Conventionally, all-weather paved track and field stadiums and multipurpose sports fields have been given a textured surface to prevent athletes from slipping.

For example, Japanese Patent Publication No. 52-65-40 proposes a method of spreading and curing chips (made of Gokai Resin) before the pavement surface is hardened. However, with this method,
In addition to requiring time and effort to collect unattached surplus chips, the adhesive strength of the chips is weak and the chips easily peel off.

Furthermore, since only the base side of the chip is fixed and the tip side is easily movable, a runner may skid and fall at a corner during a short-distance race or the like. Furthermore, since irregular chips are exposed on the pavement surface, dirt tends to accumulate at the roots of the chips, making cleaning difficult and making the pavement surface prone to staining.

On the other hand, Japanese Patent Application Laid-Open No. 57-165505 discloses that after the chips are scattered and adhered in the same manner as the above method, a two-component curing polyurethane is applied to the surface of the chips in the form of a film, thereby fixing the chips. Some proposals have been made to strengthen the structure and prevent dirt from accumulating. However, even with this method, it is still necessary to collect surplus chips, and furthermore, an extra spraying step is required to form a film, which increases the construction period and costs.

In addition, with this method, when repairing the surface, the repair work must be carried out from the step of scraping off the chips and attaching the chips, making the repair work difficult.

Furthermore, if the two-component urethane paving material hardens too much, the chips will not adhere to the pavement surface, so there is the problem that it requires skill to judge when to spray the chips. Meanwhile, on the pavement surface, mix polyurethane foam chips (
A method of spray painting a two-component curing type polyurethane composition containing
Publication No. 6) has been proposed. This method is easy to install and allows the chips to be sprayed smoothly; however,
The disadvantage is that the polyurethane foam chips have low mechanical strength and are easily worn out. In addition, if the viscosity of the spraying material is low, 3000 to 8000 cps (20°C), rubber chips or inorganic fillers with a high specific gravity may deteriorate over time in the supply tank for supplying the spraying material to a ricing gun, etc. Separated from liquid urethane (two-component curing type).
As the particles settle, the concentration of chips in the spray material changes between the early and late stages of spraying, resulting in an uneven finished layer. Therefore, during construction, it is necessary to manually stir the inside of the tank many times, which is time-consuming. In addition, in a ricing gun or the like, the spraying material falls from the supply tank to the injection port under its own weight, so the movement of the spraying material is relatively slow, resulting in poor spraying efficiency.

Furthermore, if the viscosity is high (10,000 cps or more) or the thixotropy index (hereinafter referred to as rTI value) is 3 or more, it becomes difficult for the liquid to fall under its own weight and flow, and the discharge amount is not constant, making spraying difficult.

Furthermore, Japanese Patent Publication No. 56-40205 discloses a multi-component type curable resin composition which is modified by adding a thixotropic additive to a smooth pavement surface paved using a urethane resin composition. A method has been proposed in which the urethane resin is sprayed to create an uneven pavement surface, but this method has the drawback that the urethane resin hardens and the uneven shape becomes uneven over time.

Therefore, prior to this invention, the applicant has developed a pavement surface construction method that solves the various drawbacks mentioned above and has already filed an application (Japanese Patent Application No. 177538/1983, July 1, 1988).
(filed on 6th). The invention of this application is directed to a polyurethane brebolymer composed of a polymeric polyol and an organic polyisocyanate and having two or more free isocyanate groups, and at least one selected from the group of polymeric polyols, aromatic diamines, and aliphatic diamines. A curing agent, a reaction accelerator, an inorganic filler, and a substantially non-porous material having an average particle diameter of 1 to 6 mm, the proportion of which is set to 53 to 180% by weight relative to the total amount of the above-mentioned blepolymer and curing agent. The main component is granular rubber chips, and the viscosity (20°C) is 30%.
A spraying material composition of 00 to 30,000 cps and a TI value of 1.2 to 4 is sent to the vicinity of the nozzle of the spray gun using a bomb without stirring, and then sprayed onto the surface of the elastic paving material layer and left to harden. be. This method not only provides a finishing layer with excellent non-slip properties, abrasion resistance, and chip detachment resistance, but also allows for easy construction. Easy to repair and remove dirt. It has the advantage of being easy and very accessible. However, as shown in Fig. 7, the finish layer obtained by this method has sharp protrusions 4 formed on the surface, which makes it difficult to feel when running or crouching when starting, or when engaging with spikes. It was found that there was some discomfort and there was room for improvement. In FIG. 7, ■ is a base, 2 is a primer, 3 is an elastic paving material layer, and 5 is a finishing layer.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a finishing method for an elastic pavement surface that can form a finishing layer that has no problems in construction/repair workability and cleaning workability and is also comfortable to use. That purpose.

[Means to solve the problem]

In order to achieve the above object, the elastic pavement surface finishing method of the present invention contains the following components (A) to (D), and the following components (E) are combined with the above (A) component. (B)
Contains 15 to 100% by weight based on the total amount of components, and has a viscosity (
20°C) is set at 3,000 to 30,000 cps and a thixotropy index (T I ) is set to 1.2 to 4. a step of sending the flow to the
By spraying the spraying material composition from the injection port of the spray gun toward the surface of the elastic paving material layer, an uneven layer having a large number of projections with rounded tops is formed on the elastic paving material layer. The structure is such that the uneven layer is cured as it is.

(A) A polyurethane prepolymer consisting of a polymer polyol and an organic polyisocyanate and having two or more free isocyanate groups. (B) At least one curing agent selected from the group consisting of a polymer polyol, an aromatic diamine, and an aliphatic diamine. .

(C) Reaction accelerator.

(D) Inorganic filler.

(E) Substantially non-porous and has an average particle diameter of more than 0.1 ribs1. Granular rubber chips set to be within a range of less than 0 wm.

[Effect]

That is, in this invention, spraying is carried out by adding a predetermined amount of granular rubber chips of a limited size to a spraying material composition containing a special composition of ingredients. Due to this action, the surface of the elastic polyurethane obtained by spray curing becomes an uneven surface with a large number of projections (including projections having a certain length and extending in no direction) having rounded tops. Therefore, the paved surface is comfortable to use even if you touch it with your finger while driving or when starting from a crawling start. Furthermore, the elastic polyurethane firmly adheres to the surface of the base (elastic paving material layer) and has high strength itself, so it is hardly abraded or damaged by biking or the like. Furthermore, since the uneven surface is integrally shaped, it is difficult for dust to accumulate and cleaning is easy. In addition, since the particle size of the granular rubber chips contained in the sprayed material composition of this invention is small, once uniformly mixed, the overall uniformity is maintained, making it easy to handle and feed while stirring. No special spray equipment is required.

Therefore, a uniform finished layer can be obtained using any type of spray gun, such as an air gun or a spray gun. Repair work is also simple, similar to the construction work described above.

Next, this invention will be explained in detail.

The spray material composition used in this invention has the following five components as main components.

(A) A polyurethane brevolimer made of a polymeric polyol and an organic polyisocyanate and having two or more free isocyanate groups. (B) At least one curing agent selected from the group consisting of a polymeric polyol, an aromatic diamine, and an aliphatic diamine. .

(C) Reaction accelerator.

(D) Inorganic filler.

(E) Granular rubber chips that are substantially non-porous and have an average particle diameter of more than 0.1 mm and less than 1.0 mm.

Any polyurethane prebolymer (component A) comprising the above-mentioned polymeric polyol and organic polyisocyanate and having two or more free isocyanates may be used, but for example, it may contain three or more free isocyanate groups. A polyether urethane prepolymer or acrylic urethane brevolomer (X) having
) in a ratio of X:Y of 2:8 to 9:1 on a weight basis is particularly preferred. Polyurethanes and polyureaurethanes derived from such brevolimers have high crosslink density and strength. This is because it has excellent elasticity, heat resistance, etc.

Further, the curing agent (component B) used in this invention includes polymer polyols, aromatic diaphragms, aliphatic diamines, etc., and they may be used alone or in combination of two or more.

The above-mentioned polymer polyol is a polymer compound (polymer) having two or more free hydroxyl groups and capable of an addition reaction with an organic polyisocyanate, such as ethylene glycol,
Polyalkylene ether polyols obtained by addition polymerizing alkylene oxides such as ethylene oxide, propion oxide, trimethylene oxide, etc. to diols such as propylene glycol or triols such as trimethylolpropane, glycerin, and hexanetriol (
Has two or more hydroxyl groups in one molecule and has an average molecular weight of 40
0 to 4000).

Acrylic polyols, which are acrylic copolymers having two or more free hydroxyl groups, can also be used, such as β-hydroxyethyl acrylate, β-hydroxyethyl methacrylate, β-hydroxypropyl acrylate. A hydroxyl group-containing monomer such as β-hydroxypropyl methacrylate, a monomer capable of forming a hard polymer such as SM, methacrylic acid ester, and acrylic acid. A copolymer with a carboxylic acid group-containing heptanomer such as methacrylic acid is preferred. Such commercially available products include Hirotite 3001, 3004, and 3006 manufactured by Hitachi Kakai Co., Ltd., and Lastrazol A-801 manufactured by Dainippon Ink Company. A802, A805
, A807, etc.

Preferred examples of the aromatic diamine include methylene bis-orthochloroaniline, 2,2'-dichlorobenzidine, and 1,3-bisaminomethylbenzene m-1 lylene diamine.

Furthermore, examples of the aliphatic diamine include ethylene diamine, propylene diamine, hexamethylene diamine, and 12-brobylene diamine.

As the reaction accelerator (C) used in this invention, organic metal salts such as lead octylate, tin octylate, dibutyltin laurate, and tertiary amines such as triethylenediamine are used. The amount of these used is 0.00% for the entire sprayed material assembly. It is preferable to set it to 1 to 1% by weight (hereinafter abbreviated as "%").

Further, as the inorganic filler (component D), any filler may be used as long as it can be mixed and used in ordinary elastic paving materials, such as heavy calcium carbonate. Preferably, calcium carbonate is surface-treated with aluminum hydroxide, silica, or a higher fatty acid metal salt (sodium salt, potassium salt, calcium salt, magnesium salt, aluminum salt, etc.). In particular, calcium carbonate surface-treated with the above-mentioned higher fatty acid metal salt is optimal because it also exhibits the effect of a thixotropy imparting agent.

The amount of these used is 10~
It is preferable to set it to 50%.

Furthermore, the granular chips (component E) used in this invention include polyurethane chips, polyureaurethane chips. Ethylene-propylene rubber (EPG) chips. Ethylene-propylene-diene copolymer rubber (EPDM) chips and the like are suitable. In addition to these, there are also chloroprene rubber chips and natural rubber vulcanizates. Crushed old tires can also be used.

However, the average particle diameter is 0. More than 1-1. 0
It is necessary to set it within a range less than wn. 1.
If it is 0 mm or more, the shape of the granular rubber chips is too large, and as shown in Figure 6, the protrusions on the finished surface become acute angular protrusions, the spikes do not engage sufficiently, the feeling of use is poor, and the ability to improve recording is poor. This is because you cannot hope for it. Moreover, the average particle diameter is 0. At 1 ttm or less, during spraying construction,
It is unsuitable because the uneven surface that is formed will lose its shape over time.

Note that the granular rubber chips must be substantially non-porous, but "substantially non-porous" generally means that they are not porous (sponge-like), It is acceptable for a few holes or cracks to be present. Also,
Preferably, the granular rubber chips have good mechanical properties and have an inorganic filler dispersed therein. The amount of the granular rubber chips used is 15 to 100% of the total amount of the polyurethane prebolimer (component A) and curing agent (component B).
It is necessary to set it to . If it is less than 15%, the uneven shape formed during spraying will collapse over time during spraying, and the height of the protrusions will become lower, resulting in poor non-slip properties. On the other hand, if it exceeds 100%, the size of the unevenness will be uneven, the spike resistance (wear resistance) will be poor, and the recesses will have an unspecified shape, and dirt will accumulate in these recesses, making cleaning difficult. This is because disadvantages such as the following occur.

In addition to the above-mentioned essential ingredients, the spray material composition of the present invention may optionally contain organic solvents (aromatic solvents such as toluene and xylene, and acetic acid alkyl esters that do not react with isocyanate groups). , weathering stabilizer, coloring pigment,
Conventional additive components such as light stabilizers and plasticizers can be blended.

The spray material composition obtained by mixing these components must have a viscosity of 3,000 to 30,000 cps at 20°C and a TI value of 1.2 to 4. In other words, if the viscosity is less than 3000 or the TI value is less than 1.2, the resulting finished layer will have poor non-slip properties and wear resistance, and if the viscosity exceeds 30000 cps or the TI value exceeds 4. This is because the size of the unevenness becomes non-uniform, creating a concave portion with an unspecified shape, and as mentioned above, dirt accumulates in the concave portion, making it difficult to clean.

To adjust the viscosity and TI value within the above range, higher fatty acids, higher alcohols. It is desirable to add calcium carbonate whose surface has been treated with a metal salt of a higher fatty acid or a liquid thixotropic agent (known in the art), and among these, calcium carbonate whose surface has been treated with a metal salt of a higher fatty acid (mentioned above) is the most suitable. preferable.

In addition, among the above-mentioned certain combinations, the granular rubber chips are polyureaurethane containing an inorganic filler,
In addition, it is preferable that the spray material composition containing the granular rubber chips contains at least one of an aromatic diamine and an aliphatic diamine, since this forms a surface layer with excellent abrasion resistance and heat resistance. be.

In this invention, the surface of the elastic paving material layer is finished by spraying the above-mentioned spraying material composition onto the surface of the elastic paving material layer using an appropriate spray gun. The spray gun may be of any type. That is, the granular rubber chips contained in the above spray material composition have an average particle diameter of 0.1 to 1. Since the granular rubber chips are very small and are limited to O tm, after the whole is mixed uniformly, the granular rubber chips will not settle and separate or be separated by shearing force. Therefore, there is no need to feed the liquid to the injection port while stirring, and the type of spray gun is not particularly selected.

As shown in FIG. 1, the finished layer 6 obtained in this manner has a large number of projections 7 with rounded tops, so that it does not hurt when you put your fingers on it and put your weight on it, and it does not cause any discomfort when driving. It's something that doesn't exist. In the figure, 8 is a granular rubber chip, 9 is an elastic paving material layer shaped by a polyurethane resin containing an inorganic filler 10 dispersed therein, 1 is a base, and 2 is a single layer of primer.

In addition to the structure shown in FIG. 1, the elastic pavement structure obtained by the present invention includes the following types.

(1) As shown in FIG. 2, the elastic paving material layer 9 is formed of a polyurethane resin containing 1 l of large elastic chips and an inorganic filler 10 dispersed therein, and is located between the base 1 and the primer layer 2. A base treatment layer 12 is formed on the surface.

(2) As shown in FIG. 3, the elastic paving material N9 is divided into two layers, the lower layer 13 is made of polyurethane resin containing large elastic chips 11 and an inorganic filler 10 dispersed therein, and the upper layer 14 is made of a polyurethane resin containing an inorganic filler 10 dispersed therein, and a base treatment layer 12 is formed between the base 1 and the primer layer 2.

(3) As shown in FIG. 4, the elastic paving material layer 9 has large elastic chips 15 adhered to each other with a binder, and the non-adhered portions between the elastic chips 15 are left as voids 16 for water permeability. It is constructed with a molded elastic chip layer.

(4) As shown in FIG. 5, the elastic paving material layer 9 is divided into two layers, the lower layer 17 is formed of the water-permeable elastic chip layer, and the upper layer 18 is made of polyurethane containing inorganic filler 10 dispersed therein. Something shaped by resin. However, 19 is a sealing layer.

(5) As shown in FIG. 6, the elastic paving material layer 9 is composed of a rubber plate-like structure.

Next, examples will be described together with comparative examples.

[Example 1]

<Formation of elastic paving material layer> On top of the dense-grained asphalt concrete that was cast as the base for an athletics stadium, a polymer cement containing an acrylic resin emulsion and Boltland cement in a weight ratio of 1:3 was applied. Apply, perform base treatment, and apply approximately IO
After a period of time, an epoxy resin-based water-based brimer was applied.

'''Finally, after about 10 hours, a mixture of the following polyurethane prebolymer (A+) and the following curing agent composition (Bl) mixed at a weight ratio of 1:2 was applied on the primer layer. The material was naturally cured to form an elastic paving material layer (corresponding to 9 in FIG. 1) having a thickness of 13 In[Il].

Polyurethane brevolimer (A,) Polyoxybrobylene glycol with an average molecular weight of 11,000 or polyoxypropylene triol with an average molecular weight of 3,000, excess tolylene diisocyanate} (2.4 adduct/2,6 adduct = 80 /20) by a conventional method (content of terminal isocyanate groups =
3.0%).

Curing agent composition (B.) 3.5 parts by weight of methylene bis-orthochloroaniline (hereinafter abbreviated as "parts"), 20 parts of polyoxypropylene glycol with an average molecular weight of 2000, average molecular weight ffl4 00
0 boroxypropylene triol, 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. Mixed composition.

<Formation of surface finishing layer> Next, 50 parts of the above polyurethane prebolymer (AI), 7 parts of methylenebisorthochloroaniline, and 1 part of polyoxypropylene triol having an average molecular weight of 4000
A hardening agent composition (B2
), 35 parts of non-porous granular urethane rubber chips (red color), 6 parts of calcium carbonate fine powder surface-treated with calcium stearate (thixotropy imparting agent), and 15 parts of toluene were uniformly mixed. A spraying machine (manufactured by Arena Elastobau, Str.
The mixture was placed in a material container of uctur Matic SIOOE) and stirred by rotating the stirring screw. Next, in order to start spraying construction, we operated the air compressor and liquid pump, opened and closed the bypass cock, adjusted the amount of liquid sent (spray amount) and the pressure of the compressed air, and tested the spray material assembly. After the spraying, it was sprayed onto the surface of the elastic paving material layer 9 at a spraying amount of 2 kg/rd. As a result of this spraying, a finish layer (corresponding to 6 in FIG. 1) with many rounded tops or non-directional protrusions with unevenness was formed. Then, the obtained finish N6 was left as it was to be naturally cured, and a surface layer with a thickness of about 3 mm was completely cured after about 10 hours.

The viscosity of the spraying material at the start of spraying is 6000c.
ps, TI value is 1.8, viscosity at completion of spraying is 80
00cps, TI value is 1.9, compressed air pressure is about 8
kg/cffl.

As shown in FIG. 1, the finish N6 thus obtained is such that the elastic polyurethane portion of the finishing layer 6 formed by a curing reaction forms on the surface of the elastic paving material layer 9 made of the same material. It is strongly adhered to. Regarding this finishing layer 6, the following various tests and evaluations were performed.

<Viscosity> Measured using a BH type rotational viscometer at a rotational speed of 20 rpm and a sample temperature of 20°C. The unit is cpS.

<Method for Measuring TI Value> Using a BH-type rotational viscometer, the viscosity at a rotational speed of 2 rpm and 20 rpm at a sample temperature of 20°C was measured, and then the TI value was determined from the following formula.

<Abrasion Resistance: ■Spike Resistance Test> This was carried out by the method described on page 8 of Japanese Patent Application Laid-open No. 62-37403. That is, using the test equipment shown in Figure 5 of Section 10 of this publication, the wear loss (g) when a spike pin with a load of 20 kg is rubbed against the sample 1000 times is measured, and based on that degree, the spike resistance is determined. The sex was determined.

<Abrasion resistance: ■Abrasion resistant wheel test> Performed according to JIS-K7204, and the abrasion wheel was CS-17.
, Wear loss after 1000 rotations (g) when the load is 1 kg.
It was shown in

<Coefficient of Slip Resistance (CSR)> In order to evaluate the non-slip property, it was carried out according to the "Method for Measuring Coefficient of Slip Resistance" described on page 3 of Architectural Institute of Japan Structural Paper Report No. 359.

However, instead of the sole of a slip-on tennis shoe, the sole of a track and field spike shoe is used when evaluating the finishing touch of an athletics field, and when evaluating the finishing touch of a multipurpose athletic field, the sole of a jogging shoe is used. I used the soles of my shoes. Then, the following evaluations were performed based on the obtained measured values (CSR values).

■CSR value for track and field spiked shoes: Less than 0.8 Easy to slip 0. 8-1.3 No slipping (appropriate value) 1.
3 or more Too non-slip (unsuitable) ■CSR value for jogging shoes Evaluation: 0. Less than 6 Easy to slip 0.6 to 0.8 Not slippery (appropriate value) 0.8
Above: Too slippery (unsuitable) (Easy to remove stains) If the adhered stains due to dust, etc. can be easily removed by washing with water (spraying water), it is marked as easy, and if it is difficult, it is marked as difficult.

<Workability of spraying construction> In order to evaluate the difficulty of spraying construction, five experienced spray painters conducted a spraying test for each formulation, and the painters found that the unevenness of the surface was uniformly and efficiently achieved. If you judge it yourself, you will receive 3 points, if the unevenness is slightly uneven, you will receive 2 points, and if you judge that the unevenness is extremely uneven and inefficient, you will receive 1 point, and the total score will be displayed as a total score of 5 people. did.

<Ease of repair> After grinding the surface layer of the central part (50C11 x 50C111 square space) of the lrrf sample, that part was repaired by a skilled construction engineer. Then, the case where the work is easy is shown as O, the case where it is somewhat difficult is shown as Δ, and the case where it is extremely difficult is shown as ×.

As a result of evaluating the finishing layer 6 of Example 1 based on the above-mentioned tests, the wear amount in the spike resistance test was 10 g, and the CSR value (based on spiked shoes; the same applies hereinafter unless otherwise specified) was 1. 12, and was found to have excellent non-slip properties and spike resistance. Additionally, as a result of running tests, there was no danger of skidding and the driving feel was good. Furthermore, it was easy to remove dust, and even one year after construction, there was little dirt caused by dust. Furthermore, the ease of spraying construction was rated 14 points, indicating that the construction was carried out smoothly and easily. Repairs were also rated ○.

[Example 2] Formation of elastic paving material layer> The polyurethane brevolimer (A
A mixture of 7 parts of foamed polyurethane chips having an average particle diameter of 2 film was mixed with 100 parts of Kumikaimono, which is a mixture of I) and curing agent composition (Bl) at a weight ratio of 1:2, to a thickness of 10 m.
The elastic base layer (corresponding to the lower layer 13 in FIG. 3) was formed by casting to form an elastic base layer (corresponding to the lower layer 13 in FIG. 3). Then, on the surface of this elastic base layer, a composition prepared by mixing the polyurethane brevolomer (A1) and the curing agent composition (B1) used in Example 1 at a weight ratio of 1:2 was spread to a thickness of 3 m.
The intermediate coating layer (corresponding to the upper layer 14 in FIG. 3) was formed by casting to a thickness of m and allowing it to harden naturally.

Formation of Finishing Layer> A finishing layer 6 was formed on the surface of the intermediate coating layer (upper layer 4) by spraying in the same manner as in Example 1.

In this way, a pavement structure similar to that shown in FIG. 3 was obtained.

The viscosity and TI value of the spraying material composition at the start and end of spraying were the same as in Example 1 above.

Next, the obtained finishing layer 6 was subjected to the same tests and evaluations as in Example 1 above, and as a result, the wear amount in the spike resistance test was 10 g, the CSR value was 1.14, and the non-slip property and resistance It was found that it has excellent spike properties. In addition, it was easy to remove dirt, and there was little dirt caused by dirt even one year after construction. Furthermore, the ease of spraying construction was rated 14 points, indicating that construction was carried out smoothly and easily. Repairs were also rated ○. The usability was also good. [Examples 3 and 4, Comparative Example 1.2] In Example 2, the blending amount of granular rubber chips was changed as shown in Table 1 below. Finishing work was carried out in the same manner as in Example 2 except for this. The evaluation results for the obtained finishing layer 6 are also shown in Table 1 below.

(Leaving space below) Table 1 From the above results, if the amount of granular rubber chips is less than 5%, the non-slip property will be poor, and if it exceeds 100%, the spike resistance (abrasion resistance) and usability will be poor, and it will be difficult to install. It can be seen that repair becomes difficult.

[Examples 5 and 6, Comparative Examples 3 and 4] In Example 2, the viscosity and Tl of the spray material composition were
The values were varied as shown in Table 2 below. Finishing work was carried out in the same manner as in Example 2 except for this. The resulting finish N
The evaluation results for No. 6 are also shown in Table 2 below.

However, in Example 5, the amount of toluene used was 20 parts. Further, in Example 6, the amount of calcium carbonate whose surface was treated with calcium stearate was 15 parts, and toluene was not used. Furthermore, in Comparative Example 3, the amount of toluene used was 30 parts. In Comparative Example 4, the amount of calcium bicarbonate was 10 parts, the amount of calcium carbonate surface-treated with calcium stearate was 20 parts, and toluene was not used.

From the above results, it can be seen that when the viscosity is less than 3000 cps or the TI value is less than 1.2, the non-slip property is poor. Spike resistance, poor usability, and viscosity exceeding 30,000 cps or T
It can be seen that when the I value exceeds 4.4, the spike resistance and usability deteriorate, and construction and repair become difficult.

[Examples 7 and 8, Comparative Examples 5 and 6] Finishing work was carried out in the same manner as in Example 2, except that the average particle diameter of the granular rubber chips was changed as described below. The evaluation results for the obtained finishing layer 6 are also shown in Table 3 below. (Left below) From the above results, the average particle diameter of the rubber chips is 0.1al.
Non-slip performance even on multi-purpose playgrounds below l1. Poor wear resistance, on the contrary 1. It was found that when the temperature exceeds O rrm, the spike resistance and usability are poor, and construction and repair become difficult.

[Example 9] A polyurethane primer was applied on open-grained asphalt concrete poured as a foundation for an athletics stadium, and 100 SBR rubber chips with an average particle size of 2.
A mixture of 1 part and 25 parts of a toluene solution of a one-component moisture-curing urethane (a prebolimer containing 7% free isocyanate groups) was coated to a thickness of 10 mm (corresponding to 17 in Figure 5). To a mixture of the polyurethane prepolymer (AI) and curing agent compound (B1) used in Example 1 at a weight ratio of 1:2, 30 parts of calcium carbonate surface-treated with sodium stearate was added to thixotropically. It was sealed with a two-component curing type urethane that had been given properties (corresponding to 19 in Fig. 5), and then a mixture of the above polyurethane prepolymer (A1) and curing agent combination (B1) was poured to a thickness of 3 mm. extended,
Naturally harden and apply intermediate coating layer (corresponding to 18 in Figure 5)
was formed. Next, the above intermediate coating J! On top of 18, a sprayed material was sprayed in the same manner as in Example 1 and allowed to harden naturally to form the finishing layer 6. The viscosity of the above sprayed material composite was 6000 cps, and the TI value was 1.8. and,
The CSRf& of the obtained finishing layer 6 is 1. 1 5. Spike resistance is 25g, usability is ○, dirt is easy to remove,
The ease of construction was rated 14 points, and repair was easy. [Example 10] 0.0% diphenylmethane diisocyanate-based urethane primer was applied on open-grain asphalt concrete poured as a foundation for an athletics stadium. 3 kg/bo sprayed,
On top of this, a mixture of 100 parts of SBR rubber chips with an average particle size of 2M and 25 parts of a one-component moisture-curing urethane binder (-'NCO group content 7%) was painted to a thickness of 10m+ (as shown in Figure 4). 9). And about 10
After a period of time, the polyurethane prepolymer (Al) and curing agent (B2) used in Example 1 were added in a weight ratio of 1:1.
100 parts of a mixture of 100 parts and an average particle size of 0.0 parts made from the same material. A mixture of 40 parts of 5 mm red urethane rubber chips and 10 parts of calcium carbonate surface-treated with magnesium stearate (viscosity 25,000 cps, TI value 4) was added to the above painted surface. A finishing layer 6 having a thickness of about 2 cm was formed by spraying the powder at a rate of 2 kg/% in the same manner as in Example 1 above.

The CSR value (based on jogging shoes) of this finishing layer 6 was 0.75, the amount of wear due to worn wheels was 0.6 g, the usability was 0, the ease of construction was 14 points, and repair was easy. Additionally, the water permeability of the underlying elastic paving material layer was maintained over a long period of time. Therefore, it is useful as a multipurpose playground.

[Example 11] In Example 12, no intermediate coating layer was applied, and a structure as shown in FIG. 2 was obtained. The finishing layer 6 was formed in the same manner as in Example 2 except for the above. This finishing layer 6 has a spike resistance of 15 g and a CSR value of 1. 15, the usability was 0, dirt was easy to remove, ease of construction was 14 points, and repair was easy. In addition, the viscosity of the sprayed material Mibomono is 6000 cps,
The TI value is 1. 8 There was te.

[Example 12] Rubber-based adhesive was applied to dense-grained asphalt concrete poured as a foundation for an athletics stadium, and a plate-like structure mainly made of chloroprene rubber with a thickness of 10 m was placed on top of this. was glued. Then, in the same manner as in Example 1, a spraying material composition was sprayed onto this and allowed to naturally harden to form a finishing layer. The CSR value of this finishing layer was 1.15, the spike resistance was 11g, the usability was O, stain removal was easy, the ease of construction was 14 points, and repair was easy. The viscosity and TI value of the sprayed material assembly were the same as in Example 1.

[Example 13] In Example 2, EPDM chips (average particle size 0.5 mm) were used as the granular rubber chips. Other than that, the finishing layer was formed in the same manner as in Example 2. The CSR value of this finishing layer was 1.13, the spike resistance was 18 g, the usability was O, stain removal was easy, the ease of construction was 13 points, and repair was easy.

[Example 14] Instead of the polyurethane prepolymer (A) used in Example 1, an acrylic urethane prepolymer having 3% terminal isocyanate groups derived from an acrylic polyol (100 hydroxyl groups) and tolylene diisocyanate was used. The finishing layer was formed in the same manner as in Example 1. The CSR value of this finishing layer was 1.10, the spike resistance was 12 g, the usability was O, stain removal was easy, the ease of construction was 14 points, and repair was easy. The spray material composition had a viscosity of 7000 cps and a TI value of 2.0.

[Example 15] Instead of the spray material composition used in Example 2, a polyurethane prebolymer (A2) with an NCO group content of 7% obtained in the same manner as the polyurethane prebolymer (Al) of Example 2 was used. 9 parts of methylene orthochloroaniline, 25 parts of polyoxypropylene glycol with an average molecular weight of 12,000, 65 parts of polyoxypropylene triol with an average molecular weight of 14,000, 90 parts of heavy calcium carbonate,
6.5 parts of red iron, 2.0 parts of lead octylate, and 2.5 parts of a weathering stabilizer were added to 1 part of the hardening agent composition (B).
= 100 parts of the composition stirred and mixed at a weight ratio of 2 and a non-porous average particle size of 0. 5 A spraying material made by uniformly mixing 40 parts of 1IIm granular EPDM rubber chips (red color), 6 parts of fine calcium carbonate powder (thixotropic agent) whose surface has been treated with calcium stearate, and 15 parts of toluene. It was used. Other than that, the finishing layer was formed in the same manner as in Example 2. CSR of this finishing layer
The value was 1.14, the spike resistance was Log, the dirt was easy to remove, the ease of spraying was 14 points, the repair was easy, and the usability was ○. The viscosity and TI value of the spraying material mKaimono at the start and end of spraying were the same as in Example 1.

[Comparative Example 7] In Example 1, instead of 35 parts of red-colored granular urethane rubber (non-porous), the average particle diameter was 0. 8mm
2 parts of polyurethane foam particles were used. Other than that, the finishing layer was formed in the same manner as in Example 1. The CSR value of this finishing layer is 0. 6. Spike resistance is 170g
Non-slip, abrasion resistant (spike resistant)
The stadium was inferior to the previous one, and had little practical use as an athletics stadium or multipurpose sports field. [Effects of the Invention] As described above, according to the present invention, since a material containing a predetermined amount of granular rubber chips of a limited size is used as a spray material assembly, elastic polyurethane obtained by spray curing is used. The top has an uneven surface consisting of many rounded protrusions or non-directional protrusions. therefore,
It provides a paved surface that is comfortable to use, with no discomfort even when you touch it with your finger while driving or when starting from Crouchinda. In addition, the polyurethane that forms the base of the finishing layer firmly adheres to the surface of the base (elastic paving material N) and has high strength itself, so it will not wear out or be damaged by cycling, etc. There aren't many.

Furthermore, since the uneven surface is integrally formed, it is difficult for dust to accumulate and cleaning is easy. In addition, since the granular rubber chips contained in the spray material composition of the present invention have a small particle size, once uniformly mixed, the overall uniformity is maintained, making it easy to handle and supply while stirring. No need for special spraying equipment. Therefore, a uniform finished layer can be obtained using any type of spray gun, such as an air gun or a spray gun. Repair work is also simple, similar to the construction work described above.

[Brief explanation of drawings]

FIG. 1 is a partially sectional perspective view showing an example of an elastic pavement structure obtained by the present invention, FIGS. 2 and 3. Figures 4 and 5
6 and 6 are respectively sectional views showing other examples of the elastic pavement structure obtained by this invention, and FIG. 7 is a partially sectional perspective view showing an example of the elastic pavement structure obtained by the invention according to the application filed prior to this invention. It is. 6... Finish N 7... Protrusion 8... Granular rubber chips 9... Elastic paving material layer

Claims (1)

[Claims] (1) Contains the following components (A) to (D), and
Contains the following component (E) in an amount of 15 to 100% by weight based on the total amount of the components (A) and (B), and has a viscosity (at 20°C).
is 3,000 to 30,000 cps and a thixotropy index (TI) is set to 1.2 to 4. A step of sending the spray material composition to the vicinity of the nozzle of the spray gun. By spraying the spraying material composition from the injection port of the spray gun toward the surface of the elastic paving material layer, an uneven layer having a large number of projections with rounded tops is formed on the elastic paving material layer. and a method for finishing an elastic pavement surface, which comprises curing the uneven layer as it is. (A) A polyurethane prepolymer comprising a polymer polyol and an organic polyisocyanate and having two or more free isocyanate groups. (B) At least one curing agent selected from the group consisting of polymer polyols, aromatic diamines, and aliphatic diamines. (C) Reaction accelerator. (D) Inorganic filler. (E) Substantially non-porous with an average particle diameter of 0.1 mm
Granular rubber chips set to be within a range of more than 1.0 mm.