JPH0718614A - Paving elastic block and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve durability and weather resistance and to color a block in an arbitrary color without limitations on an used pigment by forming a block of a multi-layer structure comprising a surface layer formed by at least one-layer sheet-like rubber and a lower layer formed by hardening soft elastic aggregate, hard aggregate or a mixture thereof by a binder. CONSTITUTION:A cross linking agent, a vulcanizing agent, a hardening agent, and a pigment are mixed with unvulcanized rubber which becomes a surface layer 2 and made into a sheet by a roll or the like, and cut to such a size as to be put into a metal mold to be placed in the metal mold. Subsequently, soft elastic aggregate, hard aggregate or a mixture thereof which is a material for a lower layer 3 and a binder are prepared in the metal mold, and vulcanization of the surface layer 2, hardening of the binder and horming are simultaneously performed by heat pressing to obtain a paving elastic block 1 by taking out it from the metal mold. Thus, the block can be hard to discolor and colored in various colors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement elastic block most suitable for pedestrian passages, golf course paths or poolsides, and a method for producing the same. More specifically, it has excellent durability and weather resistance. (EN) Provided are a water-impermeable, non-water-permeable pavement elastic block which is excellent in color and can be colored in any desired color, and a method for producing an elastic pavement block which can be produced extremely easily.

[0002]

2. Description of the Related Art The floor surface of pedestrian passages, walking paths of golf courses, etc. used to have a soil pavement structure in the old days, but there are many problems such as dust when the wind dries and mud when it rains. It was As a pavement structure that eliminates these drawbacks, is easy to maintain, and can effectively use waste rubber, an elastic pavement structure in which rubber chips are used as aggregates and which is fixed with a binder is widely used.

As such an elastic pavement structure, there is an elastic pavement block in which a rubber chip such as a waste tire is hardened into a block shape with a resin binder such as urethane. This elastic pavement block is elastic, has a small impact when it falls, and is safe, and is being widely used on the sidewalks of parks where infants gather. In addition, since there is only need to spread elastic blocks for pavement on site construction, there is an advantage that construction can be done in a short period of time. Further, instead of such an elastic block, a composite elastic pavement structure has also been proposed in which rubber chips are hardened with a resin binder by site construction and the surface is subjected to sealing treatment with urethane. This composite elastic pavement structure has an advantage that surface durability can be improved as compared with the case where no sealing treatment is performed.

[0004]

However, in the former case, since the rubber chip is hardened with the resin binder, there is a limit to the increase in strength. Also, since most of the resin binders use urethane resin, which has a problem of weather resistance, there is a drawback in that yellowing is severe and the usable binder colors are limited, so that it is not possible to manufacture brightly colored pavement materials. The weather resistance can be improved by using an EPDM rubber chip having excellent weather resistance to form a thick block, but it becomes expensive. Therefore, using inexpensive tire tire rubber chips etc.,
An elastic block for paving, which is colored by mixing a pigment with a resin binder, is also provided, but when used to a certain extent, the pigment on the surface wears out, and the color of rubber chips such as black appears and the paving surface becomes dirty. There is.

Therefore, there is also proposed a two-layer structure elastic block for paving in which a rubber chip hardened with a urethane binder is used as a lower layer and a rubber chip colored with a pigment is hardened with a urethane binder as an upper layer. The elastic layer for paving of this two-layer structure does not wear the pigment unlike the elastic block for paving described above, but as mentioned above, the urethane binder has poor weather resistance and has a drawback that it deteriorates the appearance due to discoloration. In order to make it inconspicuous, it is necessary to use a pigment with a strong color for coloring the rubber chip. Therefore, it is not preferable for the light colored elastic block for paving. Furthermore, the one in which the rubber chips are hardened with a urethane binder is not sufficiently durable in nature and is water permeable, so when installed in a place with water such as poolside,
There is a drawback that water leaks out when walking on it and causes discomfort.

The latter composite elastic pavement structure has a urethane surface and thus has poor weather resistance as described above, and the usable pigments are limited. In addition, surface treatment must be performed to prevent slipping in the rain. Not only does the process increase and the construction cost is high, but it requires skill and skill of a craftsman to spread and spread it, and it may not be possible to perform construction in rainy weather or depending on the moisture content of the underlying concrete. Has the drawback of becoming longer.

Therefore, the object of the present invention is to provide excellent durability,
It is an object of the present invention to provide a water-impermeable elastic block for paving, which has good weather resistance, can be colored in any color without limiting the pigment to be used, and can be used to construct an elastic pavement by paving.

Another object of the present invention is to provide a method for manufacturing an elastic paving block which can manufacture such an elastic paving block by an extremely simple process.

[0009]

The elastic block for paving of the present invention is obtained by curing a surface layer composed of at least one sheet rubber and a soft elastic aggregate or a hard aggregate or a mixture thereof with a binder. It has a multilayer structure with the lower layer.

According to the method for manufacturing an elastic pavement block of the present invention, an unvulcanized sheet rubber is charged into a mold having a predetermined block shape, and a soft elastic aggregate or a hard aggregate, or a mixture thereof and each aggregate. Alternatively, it is characterized in that a binder sufficient for the mixture is charged on a sheet-shaped rubber in a mold, and the sheet-shaped rubber is vulcanized by the mold and the binder is cured and molded at the same time.

[0011]

[Function] This elastic block for paving has a sheet-shaped rubber on the surface, so it can be made stronger and has high weather resistance, so it does not discolor easily and can be colored in various colors. An elastic block can be provided. Further, the material of the rubber of the surface layer can be appropriately selected according to the required amphiphilic property and slidability. Furthermore, it is possible to provide a highly elastic layer with good shock absorption in the lower layer, it is possible to provide an elastic block for paving with high safety, and it is possible to use inexpensive waste rubber chips etc. You can also Since this lower layer can also use two or more types of granular materials having different hardnesses, it can also have an elastic force suitable for the intended use.

According to the method for manufacturing the elastic block for pavement, the sheet rubber is vulcanized by the mold and the binder is cured and molded at the same time, and the productivity is improved and the cost can be reduced. it can. Also, since the surface layer is charged with unvulcanized rubber, it flows into the gap between the rubber chips of the lower layer and cures during vulcanization, resulting in an adhered form, increasing the adhesive strength between the surface layer and the lower layer, and for a long time. Does not cause the two layers to separate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. A pavement elastic block 1 has a surface layer 2 made of a sheet-like rubber excellent in weather resistance, elasticity and strength.
And a soft elastic aggregate (soft granular material) or hard aggregate (hard granular material) or a mixture thereof, which is located on the lower surface of the surface layer 2, and a resin binder sufficient to bond them. It is composed of two layers, a lower layer 3 and a lower layer 3. The surface layer 2 is SBR, BR, IR, IIR, NB
Rubbers such as R, CR, EPM, and EPDM are preferable, and CR and E are particularly taken into consideration when weather resistance, elasticity and strength are taken into consideration.
PM, EPDM alone or SBR, BR, IR, I
It is preferably composed of a mixture of IR, NBR, CR, EPM, EPDM and the like, and additives such as fillers may be mixed depending on the case. The surface layer 2 preferably has a thickness of 20 mm or less in terms of cost.

As the soft elastic aggregate for imparting elasticity to the lower layer 3, there is used a soft crushed chip having a particle size of 0.05 to 30.00 mm or a hijiki shape and a hardness of A70 or less according to JIS standard. . As such a soft granular material, a rubber chip, a foamed rubber chip, a waste tire rubber chip, a sponge, a cork, or the like is preferable, but a rubber chip is preferable in consideration of elasticity and fatigue. Particularly, waste rubber chips are preferable from the viewpoint of recycling and environmental problems. To make the lower layer 3 hard, the particle size is 0.05 to 30.0
0 mm hard granular material A hard aggregate having a hardness of D30 or more according to JIS standard is used. As such a granular aggregate,
Natural stone, wood chips, walnut chips, bamboo scraps, shells, ceramic grains,
Hard plastic granules, hard rubber or crushed materials are preferred. The resin binder is preferably a soft one having excellent water resistance, and examples thereof include urethane, soft epoxy, and soft polyester. Moisture-curing urethane resins are preferable in consideration of water resistance, elasticity and moldability. The amount of resin binder mixed is 7 in volume ratio (granular material / binder).
/ 1 to 15/1 is preferable, and if it is 7/1 or less, the surface looks bad and costs are high. On the other hand, if it is 15/1 or more, the strength will be reduced. The thickness of the lower layer 3 is preferably 10 mm or less in terms of elasticity.

The pavement elastic block 1 is made by kneading an unvulcanized rubber, which will be the surface layer 1, with a cross-linking agent, a vulcanizing agent, a curing agent, and a pigment by a roll or the like to form a sheet, which is then molded into a mold. Cut into a size that fits in and put in the mold. Then, the soft elastic aggregate and / or the hard aggregate, which are the materials for the lower layer 3, and a mixture of both are charged in a mold and heated and pressed to vulcanize the surface layer 1 and cure the binder. , And molding at the same time, and remove from the mold. When the anti-slip process is applied to the surface of the surface layer 2, the anti-slip process can be easily performed by adding a non-slip pattern to the mold without increasing the steps.

The elastic pavement block 1 thus produced is directly laid on concrete, asphalt pavement, or a ground such as gravel, or is laid or bonded on these pavements. In addition, a primer may be applied if necessary.

Next, an embodiment of the present invention and its characteristics will be described in comparison with two conventional elastic blocks for paving. As a specific example of the present invention, the surface layer 2 is composed of 520.0 g of unvulcanized EPDM rubber, 20.8 g of a red pigment and 2.8 of sulfur.
g was kneaded with a roll to form a sheet having a thickness of 10 mm, which was cut to 110 × 210 mm according to the mold used. As the lower layer 3, 480 g of waste tire rubber chips sold by Sumitomo Rubber Industries, Ltd. under the trade name "H-15" was used as a soft elastic aggregate. As a resin binder, M, which is commercially available from Sumitomo Rubber Industries, Ltd. under the trade name "Grip Coat C-928"
DI-based one-part moisture-curable urethane resin 10: 1 (vo
Using the ratio of 1), that is, 48.0 g, the soft elastic aggregate and the resin binder were mixed and stirred, and the mixture was placed on the sheet-shaped surface layer 2 in the mold. And temperature 160 ℃, pressure 10Kg
/ Sq cm for 30 minutes after hot pressing and then demolding, 48
I was allowed to cure for hours. The porosity of the completed pavement elastic block 1 is 20% (specific gravity d of waste tire rubber chips d = 1.1
g / cubic cm, specific gravity of resin binder d = 1.1 g / cubic cm). The size of the mold is 1 vertical
The length is 00 mm, the width is 200 mm, and the thickness is 40 mm.

Comparative Example 1 as a conventional elastic block for paving
In EPDM rubber chip 194 g sold by Sumitomo Rubber Industries, Ltd. under the trade name "GO-R13" as a soft elastic aggregate in the surface layer, and as a resin binder, the same MDI-based one-component moisture-curing urethane as in the specific example. The resin was mixed and stirred at a ratio of about 10: 1 (vol) of 16.0 g and charged into a mold having the same size as the specific example. Then, as the lower layer, 480 g of the same waste tire rubber chips as the lower layer 3 of the above-described specific example and 48.0 g of the same MDI-based one-component moisture-curing urethane resin as the specific example in a ratio of 10: 1 (vol) were mixed and stirred. Then, the mixture was charged on the surface layer in the mold, heated and pressed at a temperature of 150 ° C. and a pressure of 10 Kg / cm 2 for 15 minutes, demolded, and cured for 48 hours. The porosity of the completed pavement elastic block of Comparative Example 1 was 20.
% (Specific gravity of EPDM rubber chip d = 1.3 g / cubic c
m, specific gravity of waste tire rubber chips d = 1.1 g / cubic c
m, the specific gravity of the resin binder d = 1.1 g / cubic cm).

In Comparative Example 2, 160 g of waste tire rubber chips, which are the same as the lower layer 3 of the specific example, were used as the surface layer, and a red inorganic pigment of 0.
64 g and 16.0 g of the same MDI one-component moisture-curing urethane resin as in the specific example at a ratio of 10: 1 (vol) were mixed and stirred, and charged into a mold having the same size as in the specific example.
Next, 480 g of the same waste tire rubber chip as the lower layer and the same MDI-based one-component moisture-curing urethane resin as the concrete example
48.0 g of a ratio of 0: 1 (vol) was mixed and stirred and charged on the surface layer in the mold. And temperature 15
After hot pressing at 0 ° C. and a pressure of 10 Kg / cm 2 for 15 minutes, the mold was removed, and curing was carried out for 48 hours. The porosity of the completed elastic block for paving of Comparative Example 2 was 20% (calculated with the specific gravity d of waste tire rubber chips d = 1.1 g / cubic cm and the specific gravity d of the resin binder d = 1.1 g / cubic cm).

10 mm of the surface layer of each of these concrete examples and comparative examples 1 and 2 was cut and punched in a dumbbell shape, and a tensile test according to JIS standard K6301 and a safety (elasticity) according to JIS standard A6519. A sex) test (Gmax) was performed. The results are shown in Table 1.

[0021]

[Table 1] From this Table 1, it can be seen that the surface layer achieved high strength and elongation. According to JIS standard A6519, 100G or less is acceptable, but 70G or less is desirable when more safety is required, but in the specific example, 62G, which is substantially the same as that of Comparative Example 2, is shown. It turned out that it is also excellent in safety.

A weather resistance test was conducted using a sunshine weather meter manufactured by Suga Test Instruments Co., Ltd. Regarding the weather resistance test, the degree of discoloration was evaluated by a color difference value using a color difference meter commercially available from Minolta Co., Ltd. under the trade name "CR-310". The results are shown in Table 2.

[0023]

[Table 2] From Table 2, it was found that after 100 hours, the color difference values were obviously lower than those of Comparative Examples 1 and 2, and there was little discoloration.

This pavement elastic block 1 has a sheet-like rubber surface, and is a non-water permeable pavement elastic block. Even when it is constructed in a place with water such as poolside, when walking on it. The water does not seep out, and it is possible to provide a poolside or the like with a good walking feeling. on the other hand.
Since it is a block type, it is possible to make joints permeable, and if joint permeable construction is performed, it is possible to make a permeable pavement as a whole.

[0025]

INDUSTRIAL APPLICABILITY As described above, in the elastic paving block of the present invention, the surface layer composed of at least one sheet of rubber and the soft elastic aggregate or the hard aggregate or a mixture thereof are cured with the binder. It has a multilayer structure with the lower layer, and the sheet-shaped rubber is located on the surface. It is possible to provide an elastic pavement block that is resistant to discoloration because it can be strengthened and has high weather resistance, and can also be colored in various colors to provide blocks of various colors. Further, the material of the rubber of the surface layer can be appropriately selected according to the required amphiphilic property and slidability. Furthermore, it is possible to provide a highly elastic layer with good shock absorption in the lower layer,
Since it is possible to provide a highly safe elastic block for paving and use inexpensive waste rubber chips and the like, it is possible to reduce costs. Since the lower layer can also use two or more types of granular materials having different hardnesses, it is possible to obtain an elastic amount suitable for the intended use.

According to a second aspect of the present invention, in the method for manufacturing an elastic pavement block according to the present invention, an unvulcanized sheet rubber is charged into a mold having a predetermined block shape to form a soft elastic aggregate or a hard elastic material. It is an integral molding in which aggregate or a mixture thereof and binder sufficient for each aggregate or mixture are charged on a sheet rubber in a mold, and the sheet rubber is vulcanized by the mold and the binder is simultaneously cured and molded. The productivity can be improved and the product can be provided at a low cost.
Furthermore, since the surface layer is charged with unvulcanized rubber, it flows into the gap between the rubber chips of the lower layer and cures during vulcanization, resulting in a bonded form, and the adhesive strength between the surface layer and the lower layer increases,
The two layers do not separate even after long-term use.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an elastic paving block according to the present invention.

[Explanation of symbols]

 1 Elastic block for paving 2 Surface layer 3 Lower layer

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[Procedure amendment]

[Submission date] September 30, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

As such an elastic pavement structure, there is an elastic pavement block in which a rubber chip such as a waste tire is hardened into a block shape with a resin binder such as urethane. This elastic pavement block is elastic, has a small impact when it falls, and is safe, and is being widely used on the sidewalks of parks where infants gather. In addition, since there is only need to spread elastic blocks for pavement on site construction, there is an advantage that construction can be done in a short period of time. Further, instead of such an elastic block, a composite elastic pavement structure has also been proposed in which rubber chips are hardened with a resin binder by site construction and the surface is subjected to sealing treatment with urethane. This composite elastic pavement structure has an advantage that surface durability can be improved as compared with the case where no sealing treatment is performed.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

[Function] This elastic block for paving has a sheet-shaped rubber on the surface, so it can be made stronger and has high weather resistance, so it does not discolor easily and can be colored in various colors. An elastic block can be provided. The material of the rubber of the surface layer can be appropriately selected according to the required elasticity and slipperiness. Furthermore, it is possible to provide a highly elastic layer with good shock absorption in the lower layer, it is possible to provide an elastic block for paving with high safety, and it is possible to use inexpensive waste rubber chips etc. You can also Since this lower layer can also use two or more types of granular materials having different hardnesses, it can also have an elastic force suitable for the intended use.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

As the soft elastic aggregate for imparting elasticity to the lower layer 3, there is used a soft crushed chip having a particle size of 0.05 to 30.00 mm or a hijiki shape and a hardness of A70 or less according to JIS standard. . As such a soft granular material, a rubber chip, a foamed rubber chip, a waste tire rubber chip, a sponge, a cork, or the like is preferable, but a rubber chip is preferable in consideration of elasticity and fatigue. Particularly, waste rubber chips are preferable from the viewpoint of recycling and environmental problems. To make the lower layer 3 hard, the particle size is 0.05 to 30.0
0 mm hard granular material A hard aggregate having a hardness of D30 or more according to JIS standard is used. As such a granular aggregate, natural stone, wood pieces, walnut pieces, bamboo waste, shells, ceramic particles, hard plastic particles, hard rubber or crushed materials are preferable. The resin binder is preferably a soft one having excellent water resistance, and examples thereof include urethane, soft epoxy, and soft polyester. Moisture-curing urethane resins are preferable in consideration of water resistance, elasticity and moldability. The amount of resin binder mixed is 7 in volume ratio (granular material / binder).
/ 1 to 15/1 is preferable, and if it is 7/1 or less, the surface looks bad and costs are high. On the other hand, if it is 15/1 or more, the strength will be reduced. The thickness of the lower layer 3 is preferably 10 mm or more in terms of elasticity.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

The pavement elastic block 1 is made by kneading an unvulcanized rubber, which will be the surface layer 1, with a cross-linking agent, a vulcanizing agent, a curing agent, and a pigment by a roll or the like to form a sheet, which is then molded into a mold. Cut into a size that fits in and put in the mold. Then, the soft elastic aggregate or the hard aggregate, which is a material of the lower layer 3, or a mixture of both, and a binder are charged into a mold and heated and pressed to vulcanize the surface layer 1 and cure the binder. , And molding at the same time, and remove from the mold. When the anti-slip process is applied to the surface of the surface layer 2, the anti-slip process can be easily performed by adding a non-slip pattern to the mold without increasing the steps.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025]

INDUSTRIAL APPLICABILITY As described above, in the elastic paving block of the present invention, the surface layer composed of at least one sheet of rubber and the soft elastic aggregate or the hard aggregate or a mixture thereof are cured with the binder. It has a multilayer structure with the lower layer, and the sheet-shaped rubber is located on the surface. It is possible to provide an elastic pavement block that is resistant to discoloration because it can be strengthened and has high weather resistance, and can also be colored in various colors to provide blocks of various colors. The material of the rubber of the surface layer can be appropriately selected according to the required elasticity and slipperiness. Furthermore, it is possible to provide a highly elastic layer with good shock absorption in the lower layer,
Since it is possible to provide a highly safe elastic block for paving and use inexpensive waste rubber chips and the like, it is possible to reduce costs. Since the lower layer can also use two or more types of granular materials having different hardnesses, it is possible to obtain an elastic amount suitable for the intended use.

Claims (2)

[Claims] 1. A pavement elastic comprising a surface layer composed of at least one layer of sheet rubber and a lower layer obtained by curing a soft elastic aggregate or a hard aggregate or a mixture thereof with a binder. block. 2. An unvulcanized sheet rubber is charged into a mold having a predetermined block shape, and soft elastic aggregate or hard aggregate or a mixture thereof and each aggregate or a binder sufficient for the mixture is added to the metal mold. A method for manufacturing an elastic pavement block, which comprises charging on the sheet-shaped rubber in a mold, and simultaneously vulcanizing the sheet-shaped rubber and curing and molding the binder by the mold.