KR20220102131A - Eco-friendly elastic coat and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an elastic flooring material and a method for constructing the same, and more particularly, to an elastic court for an eco-friendly sports facility that can be used as a tennis court and a method for manufacturing the same. The elastic court according to the present invention includes a base layer; an elastic layer formed on top of the base layer; a primer layer formed on top of the elastic layer; a resurfacer layer formed on top of the primer layer; and a top coating layer formed on top of the resurfacer layer, wherein a lower reinforcing layer made of a binder containing PVA fibers is provided between the elastic layer and the primer layer, and the resurfacer layer includes PVA fibers.

Description

Eco-friendly elastic coat using PVA and photoluminescent pigment and manufacturing method thereof

The present invention relates to an elastic flooring material and a method for constructing the same, and more particularly, to an elastic court for an eco-friendly sports facility that can be used as a tennis court, and a method for manufacturing the same.

In general, among the composite elastic flooring materials for acrylic sports facilities, in the case of tennis stadiums, an elastic layer is formed by mixing and installing a pre-formed Roll-Matt type elastic layer or acrylic resin on a base layer formed of asphalt, concrete or asphalt. After forming, it is finally installed as an acrylic top-coating layer mixed with an intermediate adhesive layer and pigment.

In the case of a roll mat type elastic layer, a space is created in the connection part between the mat and the mat, and this is often called a joint. cracks occur.

In order to prevent this, before finishing the final surface layer, there is a method of attaching a roll-type product prepared in a lattice or non-directional manner, such as glass or carbon fiber, on the upper intermediate layer to form a reinforcing layer, and then finishing the final upper layer. This method has the effect of preventing cracks with the reinforcing layer and strengthening the tension of the elastic coat to improve the ball speed, but since the reinforcing layer is attached in the form of a layer, there is a gap between the middle layer and the final upper layer in the area where the adhesive strength is somewhat insufficient. On the contrary, there was a problem of quality deterioration in that the adhesive strength did not come out or another joint part was formed, causing partial or entire surface layer surface to float.

In addition, since it is attached and installed using oil-based liquid materials such as polyurea and polyurethane to install the layer-type fiber layer and increase the tensile strength of the joint, it is different from the water-based acrylic resin, which is the final upper layer. There was a problem that the separation phenomenon occurred.

Accordingly, instead of reinforcing the upper layer, a method of forming a reinforcing layer by powder coating of urea between the elastic layer and the primer to withstand the temperature-dependent change of the base layer and the influence of moisture from the base layer under the middle layer was proposed. However, the urea powder coating has a problem in that it is difficult to form a reinforcing layer of a uniform thickness due to a rapid curing rate, and a problem in that the acrylic top coating layer is cracked due to ball impact arises.

Accordingly, a method has been proposed to solve the problem caused by the joint between the mat and the mat by mixing and laying rubber chips in the acrylic resin to form an elastic layer. , reacts more sensitively to changes in the base layer according to temperature, cracks and bubbles are generated due to the flow of the base layer, and as time passes, the elastic memory and the bonding force between rubber particles due to hardening decrease due to the nature of the acrylic resin. Unlike pre-formed mats, such as wrinkling, the installed elastic layer has many irregularities, so it cannot be installed before the final upper layer of the cotton-type fiber-reinforced layer, which fundamentally cannot solve the problem.

In addition, in the case of summer among the four seasons like our country, due to high temperature, sports games are frequently conducted outdoors at night, and generally due to the contrast caused by users and facilities illuminated by lights during night games. As a result, it was difficult to distinguish the court boundary line, making it difficult to proceed with the game.

The problem to be solved in the present invention is due to the lack of adhesiveness of glass or carbon fibers inserted between the intermediate layer and the top coating layer in an elastic coat including an elastic layer and a primer layer, an intermediate layer and a top coating layer using a conventional preformed mat. It is to provide a new elastic coat capable of preventing the floating phenomenon.

The problem to be solved in the present invention is a problem due to the non-uniformity of urea inserted between the elastic layer and the primer layer in an elastic coat including an elastic layer and a primer layer, an intermediate layer and a top coating layer using a conventional mat, It is to provide a new elastic coat capable of resolving cracks caused by impact of the top coating layer.

In order to solve the above problems, the present invention

understratum;

an elastic layer formed on the base layer;

a primer layer formed on the elastic layer;

a resurfacer layer formed on the primer layer; and

In the elastic coat comprising a top coating layer formed on the surface of the resurfacing layer,

and a lower reinforcing layer made of a binder including PVA fibers between the elastic layer and the primer layer,

It provides an elastic coat, characterized in that the resurfacer layer comprises PVA fibers.

Although not limited in theory, in the elastic coat according to the present invention, a high-strength binder layer in which PVA having excellent strength and elasticity is uniformly dispersed at the bottom is formed between the lower elastic layer and the primer layer, and the lower elastic layer according to the temperature change of the base layer It prevents changes due to layer shrinkage and expansion, and at the top, PVA is uniformly dispersed in the resurfacer to form a resurfacer to reinforce the strength. A new elastic coat with high tensile strength and excellent ball speed is provided because there is no other lifting phenomenon, it is possible to solve the problem of curing properties such as urea, and the upper and lower portions of the elastic coat are reinforced uniformly.

In the present invention, the PVA fiber is a polyvinyl alcohol fiber, and preferably, PVA for concrete reinforcing material (FRC) having high strength and elasticity may be used, for example, having a strength of 10 g/d or more, 300 g It is recommended to use PVA fibers with elasticity of /d or more.

In the present invention, the PVA fiber preferably has a length of 15 mm or less to prevent entanglement with each other in the process of spraying the binder or the resurfacer resin, and more preferably the strength reinforcement by the fiber. It is preferable to have a length of 10 mm or more so that it can be sufficiently secured. It is preferable to use a bundled PVA fiber so that the PVA fiber can be uniformly dispersed in the binder and the resurfacer, and the fineness is preferably 1,200 to 2,500 d.

In the practice of the present invention, the PVA fiber can be purchased and used commercially, and can be purchased from Kuraray, Unitica, and the like.

In the present invention, the lower reinforcing layer may be a binder in which PVA is dispersed, and may preferably contain 0.1 to 1.0 parts by weight, preferably 0.3 to 0.8 parts by weight, in 100 parts by weight of the one-component binder.

In the present invention, the one-component binder used in the lower reinforcing layer is a binder whose viscosity is adjusted so that PVA fibers can be dispersed, and preferably 800 to 5,000 mPas so that PVA fibers having a length of 10 to 15 mm can be dispersed. , more preferably, it is good to use a binder having a viscosity in the range of 820 to 3,400 mPas. If the viscosity of the binder is lower than the above range, it is difficult to disperse the PVA fibers, and if it is higher than the above range, there is a problem in that it is difficult to form a coating film to a predetermined thickness.

In the practice of the present invention, as the one-component binder, a urethane-based one-component binder, an acrylic one-component binder, a butadiene-based one-component binder, etc. may be used, and may be commercially purchased and used.

In the present invention, the lower reinforcing layer may further include silica sand to increase bonding strength with the primer layer, and preferably, may contain 20 to 50 parts by weight based on 100 parts by weight of the binder. In the practice of the present invention, the silica sand may be a silica sand having a particle size of 0.25 to 0.7mm.

In the present invention, the resurfacing layer may be an acrylic resurfacing layer in which PVA is dispersed. The acrylic resurfacer layer may use an eco-friendly water-soluble acrylic resin to increase compatibility with the upper top coating layer.

In the practice of the present invention, the resurfacer layer may contain 0.1 to 1.0 parts by weight, preferably 0.3 to 0.8 parts by weight of PVA based on 100 parts by weight of the water-soluble acrylic resin.

In one embodiment of the present invention, the resurfacer layer may further include silica sand to improve bonding strength and strength with the upper top coating layer, and preferably contains 20 to 50 parts by weight based on 100 parts by weight of the water-soluble acrylic resin. can In the practice of the present invention, the silica sand may be a silica sand having a particle size of 0.25 to 0.7mm.

The present invention in one aspect,

providing a substrate;

forming an elastic layer on the base layer;

forming a reinforcing layer for preventing primary cracking made of silica sand, a fiber reinforcing agent, and a one-component binder on the elastic layer;

forming a primer layer on the first crack prevention layer;

forming a resurfacer layer for preventing secondary cracking made of silica sand, fiber reinforcement, and acrylic resin on the primer layer; and

It provides an elastic coat construction method comprising the step of forming a top coating layer on top of the resurfacer layer.

In the present invention, the elastic coat construction method may further include the step of forming a line marking comprising a photoluminescent pigment on the surface of the top coating layer.

In the present invention, the step of providing the base layer may be a step of providing a concrete base layer from which foreign substances are cleanly removed from the asphalt concrete or the surface. In the practice of the present invention, if another coating layer is formed on the surface of the base layer, it may be the base layer from which the pre-constructed coating surface is removed. In order to remove the pre-coated surface, grinding and washing and drying processes using high-pressure water and weak acid may be included.

In the present invention, the step of constructing the elastic layer may be a step of constructing an elastic layer by installing a ready-made mat on the trimmed base layer or by mixing and installing an elastic chip and a binder. In the practice of the present invention, the elastic layer is a ready-made structure or material selected from EPDM or SBR in a state of being cut, compressed, and manufactured in the form of scrap of 0.5 to 1.5 mm particle size and pressurized by combining two or more It may have a built-in structure composed of a mixture of rubber chips and water-soluble acrylic resin.

In the present invention, the step of forming the reinforcing layer for preventing primary cracking is 0.3 to 0.8 parts by weight of PVA fibers having a length of 10 to 15 mm in 100 parts by weight of a one-component binder having a viscosity of 820 to 3,400 mPas, 0.25 to 0.7 mm of particle thickness. It can be formed by mixing 20 to 50 parts by weight of silica sand and installing and curing 0.2 to 0.6 liters per 1 m 2 .

In the present invention, the water-soluble epoxy primer of the water-dispersible structure of the film layer is composed of POLYAMIDE RESIN, polyoxypropylene diglycidyl ether, diglycidyl ether polymer, or trimethylol propane, Dimethylol It may be formed by powder coating a one-component or two-component structure selected from any one of propionic acid and HDI.

In the present invention, the step of forming the resurfacer layer for preventing secondary cracking is 0.3 to 0.8 parts by weight of a PVA-based fine reinforcing agent having a length of 10 to 15 mm in 100 parts by weight of a water-soluble acrylic resin, and silica sand having a particle size of 0.25 to 0.7 mm 60 It can be formed by mixing 0.2 to 0.6 liters per 1 m 2 by mixing 100 parts by weight and curing.

In the present invention, the upper top coating layer may be formed by mixing 5 to 10 parts by weight of a liquid or solid pigment with 100 parts by weight of a water-soluble acrylic resin, and applying 0.6 to 1.0 liters per 1 m 2 .

* In the present invention, the line marking (Line-Marking) is after the first application of an acrylic primer, 3 to 10 weight of a long photoluminescent pigment of 200 to 300 mesh in 100 parts by weight of a water-soluble translucent or white acrylic resin It can be formed by mixing parts, installing 0.1 to 0.5 liters per 1 m2, and curing.

The present invention in one aspect,

understratum;

an elastic layer formed on the base layer;

a lower reinforcing layer made of a binder including PVA fibers formed on the elastic layer;

a primer layer formed on the lower reinforcing layer;

a resurfacer layer formed on the primer layer and reinforced with PVA fibers; and

a top coating layer formed on the resurfacer layer; and

It provides a tennis elastic court including a photoluminescent line marking layer formed on the top coating layer.

In the present invention, the tennis court has a tensile strength of 0.4 MPa, preferably 0.6 MPa or more, more preferably 0.8 MPa or more, for example, 1.0 MPa, 1.1 MPa, 1.2 MPa, It may have a tensile strength of 1.3 MPa, 1.4 MPa or 1.5 Mpa.

Through the present invention, due to the combination of the lower reinforcing layer comprising PVA and the upper resurfacing layer comprising PVA, an elastic coat with excellent durability that can withstand the thermal expansion of the elastic layer according to the temperature change of the base layer was provided.

In the elastic coat according to the present invention, since PVA having excellent strength and elasticity is dispersed in the resurfacing layer to reinforce the strength of the resurfacing layer itself, there is no need to separately form a glass fiber or carbon fiber layer for strength reinforcement on the upper portion, thus The lifting problem caused by the use of such an additional strength reinforcing layer can be prevented.

The elastic coat according to the present invention has a line marking layer containing a phosphorescent pigment formed on the surface, so that it is easy to distinguish the court boundary line due to the contrast generated by the user and the facilities illuminated by the lights during the night game.

The elastic coat according to the present invention increases the tear and torsion resistance, cut and tear resistance according to the contraction and expansion of the base layer by applying the PVA fiber in the first and second stages in the laying type, and is the best use for the user with its excellent rebound elasticity and shock absorption power It can provide an environment, and unlike the conventional invention, it is more eco-friendly as a water-based material, and it is characterized by being able to dramatically improve product durability, tensile strength, and defect rate through the integration of the materials used. In addition, as cracks are suppressed through this, the conventional use environment and performance can be maintained for a long period of time, and repair costs and time according to the number of years of use can be greatly reduced. In addition, by applying the phosphorescent pigment in the line marking of the stadium, it is possible to provide the best sports environment without being limited by the contrast of users and facilities or night games.

1 is a view showing a cross-sectional structure of an elastic coat constructed according to the present invention.
Figure 2 shows a photograph of the PVA fiber used in the present invention.
3 is a photograph showing the surface of the PVA-based dispersed lower reinforcing layer in the elastic coat constructed according to the present invention.
Figure 4 is a view showing the day and night form of the elastic coat constructed according to the present invention.
5 is a photograph of a composition obtained by mixing a binder and PVA having the same viscosity as in Experimental Example 1 of the present invention, (a) a state contained in a container, and (b) a photograph showing a state lifted from the container.
6 is a photograph of a composition in which a low-viscosity binder and PVA are mixed as in Comparative Experimental Example 2 of the present invention, (a) a state contained in a container, and (b) a photograph showing a state lifted from the container.

Hereinafter, the present invention will be described in detail through examples. The following examples are not intended to limit the present invention, but to illustrate the present invention.

Experimental Example 1. Lower reinforcing layer synthesis test

0.5 parts by weight of a bundled polyvinyl alcohol fiber having a length of 15 mm and a thickness of 1,200 d and a strength of 12 g/d to 100 parts by weight of a one-component polyurethane binder (Pneta's 3132C, Viscosity: 800 to 1,600 cps, 25°C) After input and stirring to disperse, 30 parts by weight of silica sand having a size of 0.3 mm were mixed and stirred again, and then the dispersion state was observed with the naked eye, and it is shown in Table 1.

Experimental Example 2.

The same procedure was carried out except that the length of the polyvinyl alcohol fiber was reduced to 10 mm in Experimental Example 1, which is shown in Table 1.

Experimental Example 3

In Experimental Example 1, the same procedure was performed except that Pneta's 3231 (Viscosit; 1,500 to 2,500, 25°C) was used as the one-component polyurethane binder, and it is shown in Table 1.

Comparative Experimental Example 1

In Experimental Example 1, PVA was performed in the same manner except that a length of 18 mm was used.

Comparative Experimental Example 2

In Experimental Example 1, the same procedure was performed except that 3000 (Viscosit; 100 to 500, 25° C.) of Pneta was used as the one-component polyurethane binder, which is shown in Table 1.

PVA was performed in the same manner except that a length of 18 mm was used.

After adding 0.5 parts by weight of bundled polyvinyl alcohol fibers having a thickness of 1,200 d and a strength of 12 g/d and stirring to disperse them, here again 30 parts by weight of silica sand 0.3 mm in size was mixed and stirred, and the dispersion state was visually observed. observed, and it is shown in Table 1.

Item Experimental Example 1 Experimental Example 2 Experimental Example 3 Comparative Experiment Example 1 Comparative Experimental Example 2 situation Good Good Good error error

Good: The state in which the PVA fibers are dispersed in the binder. Poor: The state in which the PVA fibers are entangled with each other and the dispersion is poor.

Experimental Example 4

In order to prepare a reinforced resurfacer composition, it has a length of 15 mm in 100 parts by weight of an aqueous acrylic resin (TMS-100K of Taeyoung Techpol Co., Ltd., a viscosity of 2,000 to 3,000, 25 ℃), a thickness of 1,200 d and a strength of 12 g/ 0.5 parts by weight of the bundled polyvinyl alcohol fiber of d was added and dispersed by stirring, and then 70 parts by weight of silica sand having a size of 0.3 mm of silica sand was mixed and stirred to confirm that the polyvinyl alcohol fibers were dispersed.

Experimental Example 5

In Experimental Example 4, the same procedure was performed except that the length of the polyvinyl alcohol fiber was 10 mm to prepare a reinforced resurfacing composition.

Comparative Experimental Example 3

The same procedure was performed except that PVA was not used in Experimental Example 4. A fiber-free resurfacer composition was formed.

Comparative Experimental Example 4

The same procedure was performed except that PVA was not used in Experimental Example 1. A fiber-free bottom reinforcement mixture was formed.

Comparative Experimental Example 5

In Experimental Example 1, the same procedure was performed except that nylon 66 was used instead of PVA. The fibers were agglomerated and exhibited a non-dispersed state.

Comparative Experimental Example 6

In Experimental Example 1, the same procedure was performed except that PP fibers were used instead of PVA. The fibers were agglomerated and exhibited a non-dispersed state.

Example 1. Elastic coat construction and evaluation

In order to remove the garting as shown in FIG. 1 and the coated surface of the conventional tennis stadium surface layer, the surface is ground and washed using high pressure water and weak acid (Acid), and then dried for 1 to 2 days. A clean base layer 100 was formed with an area of m x 10 m.

The elastic layer 200 was formed on the base layer 100 using ready-made elastic mats 210 manufactured using EPDM having a particle size of 0.5 to 1.5 mm.

On the upper surface of the elastic layer 200, 0.3 liters per 1 m 2 of the polyurethane binder prepared according to Experimental Example 1 was installed and cured, and a lower reinforcing layer 300 for preventing primary cracking was formed.

A water-soluble epoxy primer was powder-coated on the surface of the lower reinforcing layer 300 at 0.3 liters per 1 m 2 to form the primer layer 400 .

On the surface of the primer layer 400, 0.2 to 0.6 liters per 1 m 2 of the resurfacer composition prepared according to Experimental Example 4 was installed and cured to form a PVA-reinforced resurfacer layer 500 for preventing secondary cracking.

After mixing liquid pigment 5 in 100 parts by weight of water-soluble acrylic resin on the upper surface of the reinforced resurfacer 500, 0.7 liters per 1 m 2 was applied to form a top coating layer 600 .

Line-Marking was performed on the surface of the top coating layer 600 . After first applying an acrylic primer before line marking, 3 to 10 parts by weight of a long photoluminescent pigment of 200 to 300 mesh is mixed with 100 parts by weight of a water-soluble white acrylic resin, and installed and cured at 0.3 liters per 1 ㎡ to form. An elastic coat (10) was prepared.

Samples were taken from the finished elastic coat 10 with an area of 30 cm x 30 cm, and tensile strength and coating properties were measured. The results are shown in Table 2.

Example 2.

The same procedure was performed except that the composition of Experimental Example 2 was used for the lower reinforcing layer 300 in Example 1. The results are shown in Table 2.

Example 3

The same procedure was performed except that the composition of Experimental Example 3 was used for the lower reinforcing layer 300 in Example 1. The results are shown in Table 2.

Example 4

The same procedure was performed except that the composition of Experimental Example 5 was used for the upper PVA-reinforced resurfacer layer 500 in Example 1. The results are shown in Table 2.

Comparative Example 1

In Example 1, using the composition of Comparative Experimental Example 3, the same procedure was performed except that a lower reinforcing layer without PVA was formed. The results are shown in Table 2.

Comparative Example 2

In Example 1, the same procedure was performed except that the composition of Comparative Experimental Example 3 without PVA was used in the second crack prevention resurfacer 500. The results are shown in Table 2.

Comparative Example 3

In Example 1, instead of using the lower reinforcing layer on the surface of the elastic layer 200, the primer layer 400 was directly applied, and the surfacer 500 of Comparative Experimental Example 3 was applied on the surface of the primer layer 400. The same procedure was performed except for

division Example 1 Example 2 Example 3 Example 4 compare
Example 1 compare
Example 2 compare
Example 3 Tensile strength (Mpa) 1.42 1.30 1.35 1.39 0.71 0.75 0.62 Elongation (%) 70 75 74 72 50 51 42

Measurement of physical properties is in accordance with the KSF3888-2 examination standard.

100: base layer
200: elastic layer
300: lower reinforcement layer
400: primer layer
500: researcher layer
600: top coating layer
700: photoluminescent line

Claims (8)

understratum;
an elastic layer formed on the base layer;
a primer layer formed on the elastic layer;
a resurfacer layer formed on the primer layer;
a top coating layer formed on the resurfacer layer; and'
In the elastic coat comprising a line on the top of the top coating layer,
It has a lower reinforcing layer between the elastic layer and the primer layer,
Here, the lower reinforcing layer is made of a one-component polyurethane binder containing fibers,
The fiber used for the lower reinforcing layer is PVA having a length of 10 to 15 mm, and
The lower reinforcing layer contains 0.1 to 1.0 parts by weight of fibers in 100 parts by weight of a one-component polyurethane binder, and
The resurfacer layer is made of a water-soluble acrylic resin containing fibers,
The fiber used in the resurfacer layer is PVA having a length of 10 to 15 mm, and
The resurfacer layer contains 0.3 to 0.8 parts by weight of fibers in 100 parts by weight of a water-soluble acrylic resin,
The line formed on the top coating layer of the elastic coat is an elastic coat, characterized in that it contains a photoluminescent pigment. According to claim 1,
The PVA fiber is an elastic coat, characterized in that it has a strength of 10 g / d or more and an elasticity of 300 g / d or more. According to claim 1,
The lower reinforcing layer is an elastic coat, characterized in that it comprises 0.1 to 1.0 parts by weight of PVA and 20 to 50 parts by weight of silica sand in 100 parts by weight of the one-component polyurethane binder. According to claim 1,
The resurfacer layer is an elastic coat, characterized in that it contains 0.3 to 0.8 parts by weight of PVA, and 20 to 50 parts by weight of silica sand in 100 parts by weight of the water-soluble acrylic resin. According to claim 1,
The elastic layer is an elastic coat, characterized in that the elastic layer made of a pre-formed mat or an elastic layer installed. providing a substrate;
forming an elastic layer on the base layer;
forming a lower reinforcing layer for preventing primary cracking made of silica sand and a fiber reinforcing agent and a one-component binder on the elastic layer;
forming a primer layer on the lower reinforcing layer for preventing the first crack;
forming a resurfacer layer for preventing secondary cracking made of silica sand, fiber reinforcing agent, and acrylic resin on the primer layer;
forming a top coating layer on the resurfacer layer; and
Forming a line marking by mixing and laying an acrylic resin and a photoluminescent pigment on the top coating layer,
Here, the step of forming the lower reinforcing layer for preventing primary cracking is 0.3 to 0.8 parts by weight of PVA fibers having a length of 10 to 15 mm, 0.25 to 0.7 mm of particle thickness in 100 parts by weight of a one-component polyurethane binder having a viscosity of 800 to 3,400 mPas. It is formed by mixing 20 to 50 parts by weight of silica sand and installing and curing 0.2 to 0.6 liters per 1 m 2 ,
The step of forming the resurfacer layer for preventing secondary cracking is mixing 0.3 to 0.8 parts by weight of a PVA-based fine root reinforcing agent having a length of 10 to 15 mm, and 60 to 100 parts by weight of silica sand having a particle size of 0.25 to 0.7 mm to 100 parts by weight of a water-soluble acrylic resin. An elastic coat construction method, characterized in that it is formed by installing and curing 0.2 to 0.6 liters per 1 m2. 7. The method of claim 6,
After the acrylic primer is first applied on the upper surface of the top coating, 3 to 10 parts by weight of a 200 to 300 mesh standard long photoluminescent pigment is mixed with 100 parts by weight of a water-soluble translucent or white acrylic resin to 0.1 to 0.5 per square meter Liter installation, curing the elastic coat construction method further comprising the step of forming a line marking. understratum;
an elastic layer formed on the base layer;
a lower reinforcing layer made of a binder including PVA fibers formed on the elastic layer;
a primer layer formed on the lower reinforcing layer;
a resurfacer layer formed on the primer layer and reinforced with PVA fibers; and
a top coating layer formed on the resurfacer layer; and
A photoluminescent line marking layer formed on the top coating layer,
here,
The lower reinforcing layer is made of a one-component polyurethane binder containing fibers, the fibers used for the lower reinforcing layer are PVA having a length of 10 to 15 mm, and the lower reinforcing layer is 0.1 to 100 parts by weight of the one-component polyurethane binder. -1.0 parts by weight, and
The resurfacer layer is made of a water-soluble acrylic resin including fibers, the fiber used in the resurfacer layer is PVA having a length of 10 to 15 mm, and the resurfacer layer is 0.3 to 100 parts by weight of the water-soluble acrylic resin. Tennis elastic coat, characterized in that it contains 0.8 parts by weight.

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