JP2012132219A - Elastic pavement block and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic pavement block capable of preventing the generation of a warp while maintaining wear resistance of a surface.SOLUTION: The elastic pavement block is formed by the laminated structure of at least two layers that are a surface layer 1 formed by binding granular rubber chip materials by a binder and a cushion layer 2 formed by thermally compressing and molding rubber powder without containing the binder. Since the surface of the elastic pavement block is formed of the surface layer 1 formed by binding the granular rubber chip materials by the binder, the wear resistance of the surface of the elastic pavement block is maintained. Since the cushion layer 2 formed by thermally compressing and molding the rubber powder without containing the binder is laminated on the surface layer 1, the cushion layer 2 not containing the binder is not easily degraded, and even when the binder of the surface layer 1 is degraded, the warp deformation of the surface layer 1 is prevented by the cushion layer 2 and the generation of the warp deformation of the elastic pavement block is prevented.

Description

  The present invention relates to an elastic pavement block used by being laid on the ground or the like and a method for manufacturing the same.

  Elastic pavement blocks are laid on the ground to absorb the impact of falling or falling when playing with playground equipment, to prevent injury, and to reduce the impact on the knees when walking. Has been done. Recently, in horse-riding facilities, elastic paving blocks have been installed in outdoor horse-riding passages that lead to stables and horse riding to prevent impacts and noise when horses walk and to protect horses from cold floors. Has been done.

  As an elastic pavement block used for the above-mentioned applications, those manufactured from waste rubber products have been widely used recently. For example, an elastic pavement block produced by using a rubber chip material obtained by pulverizing a waste tire or the like and bonding the granular rubber chip material with a binder is widely used (see, for example, Patent Documents 1 and 2).

JP-A-7-9459 JP 2010-24647 A

  The elastic pavement block in which the above-mentioned granular rubber chip material is bonded with a binder, as seen in Patent Documents 1 and 2, has a single layer structure composed only of a combined layer in which the rubber chip material is bonded with a binder. Many.

  Here, the elastic pavement block is often used in an outdoor environment exposed to direct sunlight, and the binder near the surface of the elastic pavement block may be deteriorated by heat or ultraviolet rays while being laid for a long time. is there. When the binder near the surface deteriorates in this way, the vicinity of the surface of the elastic pavement block contracts, and the elastic pavement block is warped as if the end portion is lifted. In addition, not only the vicinity of the surface of the elastic pavement block but also the entire binder deteriorates over time, and due to such aged deterioration of the binder, deformation of the elastic pavement block occurs.

  However, if the elastic pavement block is warped and deformed in this way, the elastic pavement block will rattle due to the load of the person walking on the elastic pavement block, the feet of the walking person become unstable, and the adjacent elastic pavement There is a risk of injuries, such as tripping over a step between blocks. For this reason, when warp deformation occurs after laying an elastic paving block, there is a problem that it is necessary to peel it off in just a few years and replace it with a new one.

  Therefore, the product thickness of the elastic pavement block is set to keep the bonding strength between the rubber chip materials by the binder at a certain level or more and to prevent the progress of warpage due to the deterioration of the binder while ensuring the wear resistance of the surface. Increasing the rigidity by increasing the size is performed. However, when the thickness of the elastic pavement block is increased, there arises a problem that the product weight is increased, the handleability is deteriorated and the cost is increased. Moreover, the warpage due to the shrinkage of the binder in the vicinity of the surface is not solved, and it is possible to extend the replacement time of the elastic pavement block by suppressing the progress speed of the warp. It was not.

  The present invention has been made in view of the above points, and aims to provide an elastic pavement block that can prevent warping while maintaining the wear resistance of the surface, It is another object of the present invention to provide a method for manufacturing an elastic pavement block that can be manufactured at a low cost by simplifying the manufacturing process.

  The elastic pavement block according to claim 1 of the present invention includes a surface layer 1 formed by bonding granular rubber chip materials with a binder, and a cushion layer formed by hot compression molding rubber powder without containing the binder. 2. It is characterized by being formed of a laminated structure of at least two layers.

  Since the surface of the elastic pavement block is formed of the surface layer 1 formed by bonding the granular rubber chip material with a binder, the wear resistance of the surface of the elastic pavement block can be kept high. Since the cushion layer 2 formed by hot compression molding of rubber powder without containing a binder is laminated on the cushion layer 2, the cushion layer 2 not containing a binder is hardly subject to deterioration, Even if the binder is deteriorated, the warp deformation of the surface layer 1 can be prevented by the cushion layer 2, and the warp deformation can be prevented from occurring in the elastic pavement block.

  The elastic pavement block according to claim 2 of the present invention is arranged between the surface layer 1 and the back surface layer 3 formed by bonding granular rubber chip materials with a binder, and between the surface layer 1 and the back surface layer 3, The cushion layer 2 is formed by hot compression molding of rubber powder without containing, and is formed by a laminated structure of at least three layers.

  Since the surface of the elastic pavement block is formed of the surface layer 1 formed by bonding the granular rubber chip material with a binder, the wear resistance of the surface of the elastic pavement block can be kept high. Since the cushion layer 2 formed by hot compression molding of rubber powder without containing a binder is laminated on the cushion layer 2, the cushion layer 2 not containing a binder is hardly subject to deterioration, Even if the binder is deteriorated, the warp deformation of the surface layer 1 can be prevented by the cushion layer 2, and the elastic pavement block can be prevented from warping deformation, and the surface layer 1 and the back surface layer 3 having the same structure can be prevented. Are symmetrically laminated on the front and back of the cushion layer 2, the warpage of the front surface layer 1 and the back surface layer 3 is offset, and warpage deformation is less likely to occur.

  The invention according to claim 3 is characterized in that at least one of the granular rubber chip material and the rubber powder is a recycled product of rubber waste, and contributes to resource saving by recycling the waste. It is something that can be done.

  The invention of claim 4 is characterized in that the particle size of the granular rubber chip material is 0.3 to 10.0 mm, and the water permeability is ensured while ensuring the strength of the surface layer 1 and the back surface layer 3. It can be obtained satisfactorily.

  The invention according to claim 5 is characterized in that the rubber powder has a particle size of 3 to 80 μm, and the rubber powder can be filled with no gap, and the contact area of the rubber powder interface is increased. Thus, the bonding strength can be ensured and the strength and elastic force of the cushion layer 2 can be obtained.

  In the method for producing an elastic pavement block according to claim 6 of the present invention, a layer 7 of a material containing rubber powder not containing the binder is laminated between layers 5 and 6 of a material containing granular rubber chip material and a binder. These are thermally compressed and simultaneously formed into a single piece, and are arranged between the surface layer 1 and the back layer 3 formed by bonding the granular rubber chip material with a binder, and between the surface layer 1 and the back layer 3, It is characterized by producing an elastic pavement block formed of a laminated structure of at least three layers of the cushion layer 2 formed by hot compression molding of rubber powder without containing.

  Formed by bonding granular rubber chip material with binder by thermally compressing granular rubber chip material and layers 5 and 6 of material containing binder and layer 7 of material containing rubber powder not containing binder at the same time. The elastic pavement block can be manufactured by laminating each layer simultaneously with forming the front surface layer 1 and the back surface layer 3 and the cushion layer 2 formed by heat compression molding of rubber powder without using a binder. Compared to the method of manufacturing the elastic pavement block by individually molding the surface layer 1 and the back surface layer 3 and the cushion layer 2 and bonding them together, the manufacturing process can be reduced and simplified. An elastic pavement block can be manufactured at low cost.

  According to the elastic pavement block of the present invention, since the surface of the elastic pavement block is formed of the surface layer 1 formed by bonding the granular rubber chip material with the binder, the resistance of the surface of the elastic pavement block is improved. Since the cushion layer 2 formed by heat compression molding of rubber powder without containing a binder can be laminated on the surface layer 1 while being able to maintain high wear resistance, the cushion layer does not contain a binder. 2 is difficult to be deteriorated, and even when the binder of the surface layer 1 is deteriorated, the warp deformation of the surface layer 1 can be prevented by the cushion layer 2, and the warp deformation of the elastic pavement block is prevented. It is something that can be done.

  According to the elastic pavement block according to claim 2 of the present invention, the surface of the elastic pavement block is formed of the surface layer 1 formed by bonding the granular rubber chip material with the binder, so that the resistance of the surface of the elastic pavement block is improved. A cushion layer that does not contain a binder because the cushion layer 2 formed by heat compression molding rubber powder without containing a binder can be laminated on the surface layer 1 while maintaining high wearability. 2 is difficult to be deteriorated, and even if the binder of the surface layer 1 deteriorates, the warp deformation of the surface layer 1 can be prevented by the cushion layer 2, and the elastic pavement block can be prevented from warping deformation. In addition, since the front surface layer 1 and the back surface layer 3 having the same structure are symmetrically laminated on the front and back surfaces of the cushion layer 2, the warpage of the front surface layer 1 and the back surface layer 3 is offset. , In which warpage is hardly more occur.

  According to the method for producing an elastic pavement block according to claim 6 of the present invention, the layers 5 and 6 of the material containing the granular rubber chip material and the binder and the layer 7 of the material containing the rubber powder containing no binder are thermally compressed. The surface layer 1 and the back surface layer 3 formed by combining the granular rubber chip material with a binder, and the cushion layer 2 formed by heat compression molding of rubber powder without containing the binder. At the same time as molding, each layer can be laminated to produce an elastic pavement block. The surface layer 1, the back layer 3 and the cushion layer 2 are individually molded and bonded together to produce an elastic pavement block. Compared to the construction method, the manufacturing process can be simplified and simplified, and the elastic pavement block can be manufactured at a low cost.

The elastic pavement block which concerns on this invention is shown, (a) (b) is a perspective view of each aspect, respectively. The manufacturing method of the elastic pavement block concerning this invention is shown, (a) (b) is sectional drawing of each process, respectively.

  Embodiments of the present invention will be described below.

  In the present invention, the granular rubber chip material forming the front surface layer 1 and the back surface layer 3 of the elastic pavement block A and the rubber powder forming the cushion layer 2 are not particularly limited, but can be obtained from rubber waste. It is preferable to use one. The rubber waste may be waste before vulcanizing the rubber or waste after vulcanizing the rubber. The granular rubber chip material can be obtained, for example, by crushing or pulverizing rubber waste, and the rubber powder can be obtained as abrasive powder of rubber waste. By using rubber waste in this way, it is possible to effectively reuse the waste to save resources, and it is possible to manufacture a cheaper elastic pavement block A because the material cost is hardly required. Is. Here, for example, when the waste of the transmission belt is used as the rubber waste, in addition to the rubber, the transmission belt is made of fibers such as cotton, nylon 6, para-aramid, meta-aramid, vinylon, etc. A fiber such as polyester is contained as a core wire. For this reason, the elastic pavement block A can contain fibers in addition to the rubber chip material, and the elastic pavement block A excellent in strength and elasticity can be obtained.

  In addition, the rubber component of the granular rubber chip material and rubber powder is not particularly limited, and chloroprene rubber, EPDM rubber, natural rubber rubber, butadiene rubber, styrene butadiene rubber, hydrogenated nitrile rubber, ACSM ( Alkylated chlorosulfonated polyethylene) rubber is optional.

  The particle size of the granular rubber chip material forming the surface layer 1 and the back layer 3 of the elastic pavement block A is important for obtaining high water permeability while ensuring the tensile strength and durability of the surface layer 1 and the back layer 3. The range of 0.3 to 10.0 mm is preferable, and the range of 2 to 6 mm is more preferable. If the particle size of the granular rubber chip material exceeds 6 mm, particularly exceeding 10.0 mm, the bonding strength between the granular rubber chip materials decreases, and therefore the surface layer 1 and the back surface layer 3 are liable to be damaged and worn. This is not preferable because it is too fast. On the other hand, when the particle size of the granular rubber chip material is less than 2 mm, particularly less than 0.3 mm, it becomes difficult to form a gap between the granular rubber chip materials. Since voids cannot be formed in the back layer 3, it becomes difficult to obtain water permeability.

  The particle size of the rubber powder forming the cushion layer 2 of the elastic pavement block A is important for ensuring strength and elasticity, and is preferably in the range of 3 to 80 μm. When the particle size of the rubber powder is less than 3 μm, the rubber powder becomes bulky, so that the handling property may be lowered when the rubber powder is put into the mold during molding. Conversely, when the particle size of the rubber powder is more than 80 μm, it is impossible to fill the rubber powder without gaps, and it becomes impossible to secure a large contact area at the interface of the rubber powder, and the bonding strength between the rubber powders is high. It becomes low, there exists a possibility that a defect | deletion may arise in the cushion layer 2, and it becomes difficult to obtain required intensity | strength and elastic force.

  Then, a liquid binder is added to the granular rubber chip material as an adhesive, and this is sufficiently stirred and mixed to disperse and infiltrate the binder over the entire surface of the granular rubber chip material, and the mixture of the granular rubber chip material and the binder is cast into a mold. Then, the surface layer 1 or the back surface made of a rubber chip bonded body in which granular rubber chip materials are bonded with a binder by curing the binder by heating and pressing, or by naturally curing the binder with moisture in the air. The layer 3 can be formed. The conditions for heat and pressure molding are not particularly limited, but it is preferable to set the mold temperature in the range of 140 to 180 ° C., time of 3 to 30 minutes, and surface pressure of 0.1 to 15 MPa.

  Although it does not specifically limit as said binder adhesive agent, 1 liquid urethane binder etc. can be used. The one-component urethane binder is mainly composed of an NCO-terminated prepolymer, and the effect of increasing the strength and durability of the elastic pavement block A can be obtained by bonding the granular rubber chip material with the NCO-terminated prepolymer. is there. As the binder, in addition to such a polyurethane type, a known adhesive such as an epoxy resin type or an acrylic resin type can also be used.

  In addition, rubber powder is used as a single rubber powder without mixing with a binder, and a rubber powder compact that does not contain any binder by putting agglomerates of rubber powder into a mold, heating and pressurizing and hot compression molding The cushion layer 2 made of can be formed. The heat compression conditions for heating and pressurization are not particularly limited, but are set within the range of mold temperature 100 to 180 ° C. (more preferably 140 to 180 ° C.), time 3 to 30 minutes, and surface pressure 1 to 15 MPa. It is preferable to do this.

  Rubber powder obtained from rubber products contains vulcanizing agents and vulcanization accelerators that did not contribute to vulcanization in rubber products and remained in the rubber powder during hot compression molding by heating and pressing. They are bonded together by co-vulcanization at the interface and solidified as a molded body, and since the rubber powder is a powder with a small particle size, the rubber powder is filled without gaps, and the contact area of the interface is It becomes large and the bonding force between the rubber powders by co-vulcanization increases. Therefore, the cushion layer 2 can be molded as a compressed body of rubber powder by hot compression molding without the need to bind the rubber powder using a binder.

  An elastic pavement block having a two-layer laminated structure of the surface layer 1 and the cushion layer 2 as shown in FIG. 1A by overlapping and adhering the cushion layer 2 to the lower surface of the surface layer 1 molded as described above. A can be produced. Further, the cushion layer 2 is overlapped between the surface layer 1 and the back surface layer 3 formed as described above, that is, the surface layer 1 is overlapped on the upper surface of the cushion layer 2, and the back surface layer 3 is overlapped on the lower surface of the cushion layer 2. By bonding, an elastic pavement block A having a three-layer structure of a surface layer 1, a cushion layer 2, and a back layer 3 as shown in FIG. 1B can be produced. Any adhesive can be used as an adhesive for bonding the surface layer 1 or the back layer 3 and the cushion layer 2. For example, the adhesive used as a binder for bonding the granular rubber chip material as described above can be used. Can do.

  FIG. 1A shows an elastic pavement block A having a laminated structure of only two layers in which the surface layer 1 and the cushion layer 2 are in contact with each other. The laminated structure described above may be used. FIG. 1B shows an elastic pavement block A having a laminated structure of only three layers in which the surface layer 1, the cushion layer 2 and the back surface layer 3 are in contact with each other, but other layers are laminated below the back surface layer 3. For example, a laminated structure of four or more layers may be used.

  In the elastic pavement block A having a structure in which the surface layer 1 and the cushion layer 2 are laminated as shown in FIG. 1 (a), the surface layer 1 is composed of a rubber chip bonded body in which granular rubber chip materials are bonded with a binder. The abrasion resistance of the surface can be maintained high by the cured binder. Further, since the cushion layer 2 is made of a rubber powder layer containing no binder, the elasticity of the rubber is maintained as it is, and the elastic pavement block A can be provided with high impact absorption.

  Here, since the binder is contained in the surface layer 1 as described above, the surface layer 1 may shrink when the binder is deteriorated with time due to irradiation with sunlight or the like. However, since the cushion layer 2 laminated on the back side of the surface layer 1 does not contain any binder, the cushion layer 2 is not easily deteriorated over time. Maintained for a long time. For this reason, the stress (tensile force) repelling against the force that the surface layer 1 contracts and warps acts on the cushion layer 2 and can prevent the elastic pavement block A from warping. . Therefore, the thickness of the product of the elastic pavement block A can be reduced within the range that does not have an excessive impact on the shock absorbing performance, and it is possible to avoid the weight increase, so the handling property is improved and the material cost is reduced. It can suppress and can manufacture at low cost.

  Further, as described above, the cushion layer 2 is formed by hot compression molding of rubber powder and does not contain any binder. Therefore, the cushion layer 2 is more than the surface layer 1 in which the binder is cured to bind the granular rubber chip material. In general, the hardness is set to be low, and the elasticity of the elastic pavement block A is ensured to be high by the cushion layer 2. And even if the surface layer 1 becomes hard due to deterioration with time of the binder of the surface layer 1, the cushion layer 2 that does not contain the binder has a small change in hardness due to change over time, and the hardness at the time of manufacture is maintained for a long time. Therefore, the elastic change of the elastic pavement block A is small, and the impact absorption performance of the elastic pavement block A can be kept high over a long period of time.

  As described above, the wear resistance of the surface of the elastic pavement block A is the surface layer 1, the shock absorption is the cushion layer 2, and the respective characteristics are shared by each layer. Therefore, these characteristics are individually designed by adjusting the wear resistance by adjusting the bulk density of the surface layer 1 and the amount of binder added, and adjusting the shock absorption by the bulk density and thickness of the cushion layer 2. It is possible to respond to the user's request more easily than the conventional single layer structure.

  Further, the elastic pavement block A having the structure in which the front surface layer 1 and the back surface layer 3 and the cushion layer 2 in FIG. 1B are laminated has the same advantages as described above. Moreover, in this case, since the back surface layer 3 is provided in addition to the front surface layer 1, it is formed in a vertically symmetrical layer structure with the cushion layer 2 interposed therebetween. Since the surface layer 1 and the back surface layer 3 are each formed to contain a binder, even if the binder of the surface layer 1 and the back surface layer 3 deteriorates and shrinks with time, the same dimensions above and below the cushion layer 2. A change will occur, the warpage of the front surface layer 1 and the back surface layer 3 is offset, and the elastic pavement block A is less likely to warp. Therefore, it is preferable to form the front surface layer 1 and the back surface layer 3 with the same composition, and it is preferable to set the thicknesses to be the same.

The thickness of the elastic pavement block A is not particularly limited, but the thickness of the surface layer 1 and the back layer 3 is set to about 2 to 10 mm, the thickness of the cushion layer 2 is set to about 5 to 40 mm, and the surface layer 1 and It is preferable to set the ratio of the thickness of the back surface layer 3 and the cushion layer 2 in the range of 1: 2 to 1: 5. Further, the bulk density of the elastic pavement block A is not particularly limited, but the bulk density of the surface layer 1 and the back layer 3 is about 0.6 to 1.3 g / cm ³ , and the bulk density of the cushion layer 2 is 0. It is preferable to set to about 5 to 1.2 g / cm ³ .

  In the above embodiment, the surface layer 1, the back surface layer 3, and the cushion layer 2 are respectively formed in advance, and the surface layer 1 is formed on the top surface of the cushion layer 2, and the back layer 3 is formed on the bottom surface of the cushion layer 2. The elastic pavement block A having a three-layer laminated structure of the surface layer 1, the cushion layer 2 and the back surface layer 3 as shown in FIG. 1B is manufactured by bonding with an adhesive, respectively. The elastic pavement block A can also be manufactured by the simultaneous integral molding method.

  That is, first, a binder is mixed with a granular rubber chip material to prepare materials 5 and 6 for the surface layer 1 and the back surface layer 3, and a material 7 for the cushion layer 2 is prepared with rubber powder not containing the binder. 2A, the material 6 for the surface layer 1, the material 7 for the cushion layer 2, and the material 5 for the back layer 3 are supplied into the cavity recess 10 of the mold 9, and the cavity recess The materials 6, 7, 5 are deposited in 10. Next, while heating the materials 6, 7, 5 in the cavity recess 10 with the molding die 9, the materials 6, 7, 5 in the cavity recess 10 are added with the pressure plate 11 as shown in FIG. And hot compression molding. By heat compression molding in this way, it is possible to mold the surface layer 1 and the back layer 3 composed of a rubber chip bonded body in which granular rubber chip materials are bonded with a binder, and at the same time, to mold the cushion layer 2 as a compressed body of rubber powder. At the same time, the surface layer 1 and the back surface layer 3 can be bonded to the cushion layer 2 with a binder for bonding the granular rubber chip material. An elastic pavement block A having a three-layer laminated structure of the cushion layer 2 and the back surface layer 3 can be obtained.

  In this manner, the front surface layer 1 and the back surface layer 3 formed by bonding granular rubber chip materials with a binder, and the cushion layer 2 formed by hot compression molding of rubber powder without using a binder are simultaneously formed. The elastic pavement block A can be manufactured by laminating the layers 1, 2, and 3. Therefore, after forming the front surface layer 1 and the back surface layer 3 and the cushion layer 2 individually, the manufacturing process can be reduced as compared with the case where the elastic pavement block A is manufactured by bonding these layers. The elastic pavement block A can be manufactured at a low cost.

  In addition, it is not preferable to apply the manufacturing method of FIG. 2 to the elastic pavement block A having a structure in which the surface layer 1 and the cushion layer 2 of FIG. That is, a material 6 for the surface layer 1 prepared by mixing a granular rubber chip material with a binder and a material 7 for the cushion layer 2 prepared by rubber powder not blended with a binder in the cavity recess 10 of the mold 9. The elastic pavement block A having a two-layer structure of the surface layer 1 and the cushion layer 2 is formed by pressurizing the materials 6 and 7 in the cavity recess 10 with the pressure platen 11 and applying heat compression molding. Can be manufactured. However, since the surface layer 1 contains a binder and the cushion layer 2 does not contain a binder, the dimension that the surface layer 1 shrinks and the dimension that the cushion layer 2 shrinks during cooling after molding. 2 is greatly different, and the elastic pavement block A having a two-layer laminated structure of the surface layer 1 and the cushion layer 2 is greatly warped due to the difference in dimensional shrinkage. Therefore, it is difficult to apply the manufacturing method of FIG. . On the other hand, in the elastic pavement block A having a three-layer structure in which the cushion layer 2 is laminated between the surface layer 1 and the back surface layer 3 as shown in FIG. 1B, the surface layer 1 and the back surface layer 3 sandwich the cushion layer 2 therebetween. Since the layers are symmetrically laminated, the difference in dimensional shrinkage between the surface layer 1 and the cushion layer 2 and the difference in dimensional shrinkage between the cushion layer 2 and the back surface layer 3 are offset, and warping occurs. The elastic pavement block A can be manufactured.

  Next, the present invention will be specifically described with reference to examples.

Example 1
A vulcanized rubber product (transmission belt) made of the chloroprene rubber composition shown in Table 1 was pulverized to a particle size of 3 mm to obtain a granular rubber chip material. To 100 parts by mass of this granular rubber chip material, 30 parts by mass of a binder (one-component urethane binder: “Takenate F-188P” manufactured by Mitsui Chemicals Polyurethane Co., Ltd.) is added and mixed, and the surface layer 1 and the back layer 3 are used. Materials 5 and 6 were prepared. Further, rubber powder having a particle diameter of 10 μm obtained by polishing a vulcanized rubber product (power transmission belt) made of the chloroprene rubber composition shown in Table 1 was prepared as a material 7 for the cushion layer 2 without blending a binder. .

  Next, as shown in FIG. 2A, the material 6 for the surface layer 1, the material 7 for the cushion layer 2, and the material 5 for the back surface layer 3 were put into the cavity recess 10 of the mold 9 in this order. The material 6 for the front surface layer 1 and the material 5 for the back surface layer 3 were added in the same amount. Then, as shown in FIG. 2B, after heat compression molding was performed at 170 ° C. for 10 minutes and a surface pressure of 11 MPa, the molded product was taken out and cooled at room temperature. In this way, an elastic pavement block test piece having a length of 200 mm, a width of 100 mm, and a thickness of 43 mm, which is a three-layer laminated structure of the front surface layer 1, the cushion layer 2, and the back surface layer 3, was obtained.

(Example 2)
The input amount of the material 6 for the front surface layer 1 and the material 5 for the back surface layer 3 to the molding die 9 is set to be the same as in the first embodiment, and the input amount of the material 7 for the cushion layer 2 is smaller than that in the first embodiment. Molding was performed in the same manner as in Example 1 except for setting. In this way, the thickness and bulk density of the front surface layer 1 and the back surface layer 3 are the same as in Example 1, the bulk density of the cushion layer 2 is the same as in Example 1, and the thickness is thinner than that in Example 1, 200 mm in length. A test piece for an elastic pavement block having a width of 100 mm and a thickness of 22 mm was obtained.

(Example 3)
A vulcanized rubber product (transmission belt) made of the chloroprene rubber composition shown in Table 1 was pulverized to a particle size of 3 mm to obtain a granular rubber chip material. To 100 parts by mass of this granular rubber chip material, 30 parts by mass of a binder (one-component urethane binder: “Takenate F-188P” manufactured by Mitsui Chemicals Polyurethane Co., Ltd.) is added and mixed, and the surface layer 1 and the back layer 3 are used. Materials 5 and 6 were prepared. Further, rubber powder having a particle size of 10 μm obtained by polishing a vulcanized rubber product (power transmission belt) made of the EPDM rubber composition shown in Table 2 was prepared as a material 7 for the cushion layer 2 without blending a binder. .

  Next, as shown in FIG. 2A, the material 6 for the surface layer 1, the material 7 for the cushion layer 2, and the material 5 for the back surface layer 3 were put into the cavity recess 10 of the mold 9 in this order. The material 6 for the front surface layer 1 and the material 5 for the back surface layer 3 were added in the same amount. Then, as shown in FIG. 2B, after heat compression molding was performed at 170 ° C. for 10 minutes and a surface pressure of 11 MPa, the molded product was taken out and cooled at room temperature. In this way, an elastic pavement block test piece having a length of 200 mm, a width of 100 mm, and a thickness of 22 mm having a three-layer laminated structure of the front surface layer 1, the cushion layer 2, and the back surface layer 3 was obtained.

(Examples 4 and 5)
The input amount of the material 6 for the front surface layer 1 and the material 5 for the back surface layer 3 to the molding die 9 is set to be the same as in the third embodiment, and the input amount of the material 7 for the cushion layer 2 is smaller than that in the third embodiment. Molding was performed in the same manner as in Example 3 except for setting. Thus, the thickness and bulk density of the surface layer 1 and the back surface layer 3 are the same as in Example 3, the thickness of the cushion layer 2 is the same as in Example 3, and the bulk density is smaller than that in Example 3, 200 mm in length. A test piece for an elastic pavement block having a width of 100 mm and a thickness of 22 mm was obtained.

(Example 6)
A vulcanized rubber product (transmission belt) made of the chloroprene rubber composition shown in Table 1 was pulverized to a particle size of 3 mm to obtain a granular rubber chip material. To 100 parts by mass of the granular rubber chip material, 30 parts by mass of a binder (one-component urethane binder: “Takenate F-188P” manufactured by Mitsui Chemicals Polyurethanes) was added and mixed to prepare a material 6 for the surface layer 1. . Then, this material 6 was put into the cavity recess 10 of the mold 9 and subjected to hot compression molding under conditions of 170 ° C., 10 minutes and a surface pressure of 11 MPa, then taken out and cooled to room temperature to obtain the surface layer 1.

  Further, rubber powder having a particle diameter of 10 μm obtained by polishing a vulcanized rubber product (transmission belt) made of the chloroprene rubber composition shown in Table 1 above is used as a material 7 for the cushion layer 2 without blending a binder. Got ready. Then, this material 7 was put into the cavity recess 10 of the mold 9 and subjected to hot compression molding under the conditions of 170 ° C., 10 minutes and a surface pressure of 11 MPa, then taken out and cooled to room temperature to obtain the cushion layer 2.

  Next, the surface layer 1 and the cushion layer 2 are bonded and bonded together with an adhesive (one-component urethane binder: “Takenate F-188P” manufactured by Mitsui Chemicals Polyurethane Co., Ltd.). A test piece for an elastic pavement block having a length of 200 mm, a width of 100 mm, and a thickness of 22 mm, having a two-layer structure of 2 was obtained.

(Comparative Example 1)
A vulcanized rubber product (transmission belt) made of the chloroprene rubber composition shown in Table 1 was pulverized to a particle size of 3 mm to obtain a granular rubber chip material. A material 6 was prepared by adding 30 parts by mass of a binder (one-component urethane binder: “Takenate F-188P” manufactured by Mitsui Chemicals Polyurethanes) to 100 parts by mass of the granular rubber chip material. Then, this material 6 was put into the cavity recess 10 of the mold 9 and subjected to hot compression molding under conditions of 170 ° C., 10 minutes and a surface pressure of 11 MPa, and then taken out and cooled at room temperature. In this way, a test piece for an elastic pavement block having a single layer structure of the surface layer 1 and having a thickness of 200 mm, a width of 100 mm, and a thickness of 42 mm was obtained.

(Comparative Example 2)
Molding was performed in the same manner as in Comparative Example 1 except that the amount of material 6 input to the mold 9 was set to be smaller than that in Comparative Example 1. Thus, a test piece for an elastic pavement block having a bulk density of the same as that of Comparative Example 1, a thin thickness and a single-layer structure of the surface layer 1 and having a thickness of 200 mm, a width of 100 mm, and a thickness of 22 mm was obtained.

(Comparative Example 3)
A vulcanized rubber product (transmission belt) made of the chloroprene rubber composition shown in Table 1 was pulverized to a particle size of 3 mm to obtain a granular rubber chip material. To 100 parts by mass of the granular rubber chip material, 30 parts by mass of a binder (one-component urethane binder: “Takenate F-188P” manufactured by Mitsui Chemicals Polyurethanes) was added and mixed to prepare a material 6 for the surface layer 1. . Further, rubber powder having a particle diameter of 10 μm obtained by polishing a vulcanized rubber product (transmission belt) made of the chloroprene rubber composition shown in Table 1 above is used as a material 7 for the cushion layer 2 without blending a binder. Got ready.

  Next, the material 6 for the surface layer 1 and the material 7 for the cushion layer 2 are put into the cavity recess 10 of the mold 9, and after heat compression molding at 170 ° C. for 10 minutes and a surface pressure of 11 MPa, molding is performed. The product was taken out and cooled at room temperature. In this way, a test piece for an elastic pavement block having a two-layer structure of the surface layer 1 and the cushion layer 2 and having a length of 200 mm, a width of 100 mm, and a thickness of 22 mm was obtained.

  As described above, the bulk density, wear resistance, shock absorption, and weather resistance of the elastic pavement block test pieces obtained in the examples and comparative examples were measured. The results are shown in Table 3. The measuring method is as follows.

The bulk density was calculated and calculated by the equation of mass of test piece (g) / volume of test piece (cm ³ ).
Abrasion resistance was measured by applying a load of 4.9 N (500 gf) to the test piece and performing a Taber wear test. The wear rate (%) was expressed as [wear amount (g) / mass of test piece before test ( g) × 100].
The impact absorbability is measured in accordance with a floor hardness test (JIS A6519), and the impact acceleration when a steel head body (mass 3.85 kg) is freely dropped from a height of 20 cm onto a test piece ( G value) was determined.
The weather resistance was measured using a weather resistance tester (“Strong Energy Xenon Meter” manufactured by Suga Test Instruments Co., Ltd.) using an artificial light source xenon arc, and evaluated by confirming the presence or absence of warping of the test piece with respect to the irradiation time.

  As can be seen in Table 3, in Comparative Examples 1 and 2 having a single layer structure of the surface layer, warping occurred by conducting a weather resistance test, but an example in which a cushion layer was laminated between the surface layer and the back surface layer. In Example 6 in which the cushion layer is bonded to the back side of the surface layer with an adhesive, the occurrence of warpage is not recognized, and the occurrence of warpage is caused by laminating a cushion layer that does not contain a binder. It was confirmed that can be prevented.

  Moreover, about Examples 1-5, about the elastic pavement block of the 3 layer laminated structure of a surface layer, a cushion layer, and a back layer, it was able to manufacture by simultaneous integral molding, without generate | occur | producing a curvature. On the other hand, the elastic pavement block having the two-layer structure of the surface layer and the cushion layer is warped immediately after molding as in the case of Comparative Example 3, and the simultaneous integral molding is suitable. Not confirmed.

1 Surface layer 2 Cushion layer 3 Back layer A Elastic pavement block

Claims (6)

  It is formed by a laminated structure of at least two layers of a surface layer formed by bonding granular rubber chip materials with a binder and a cushion layer formed by hot compression molding of rubber powder without containing the binder. Elastic pavement block characterized by.   A front surface layer and a back surface layer formed by bonding granular rubber chip materials with a binder, and a cushion layer that is disposed between the front surface layer and the back surface layer and is formed by heat compression molding rubber powder without containing the binder. An elastic pavement block formed of a laminated structure of at least three layers.   The elastic pavement block according to claim 1 or 2, wherein at least one of the granular rubber chip material and the rubber powder is a recycled product of rubber waste.   The elastic pavement block according to any one of claims 1 to 3, wherein the granular rubber chip material has a particle size of 0.3 to 10.0 mm.   The elastic pavement block according to any one of claims 1 to 4, wherein the rubber powder has a particle size of 3 to 80 µm.   In producing the elastic pavement block according to any one of claims 2 to 5, a layer of a material containing rubber powder not containing the binder is overlapped between a layer of granular rubber chip material and a material containing binder. In addition, it is formed by simultaneously compressing and thermally molding this to form a granular rubber chip material bonded with a binder, and is disposed between the surface layer and the back layer, and contains the binder. A method for producing an elastic pavement block comprising producing an elastic pavement block having a laminated structure of at least three layers of cushion layers formed by hot compression molding of rubber powder.

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