JP4486139B2 - Paving materials and artificial grass - Google Patents

Description

  The present invention relates to a pavement material and artificial turf.

  Conventionally, elastic pavement materials having elasticity may be used for road pavements, sports facility grounds, ball games, and the like. A typical example of an elastic pavement is a rubber piece bonded with a resin binder such as urethane. The rubber pieces are made by scraping old tires, melting waste rubber, or the like.

  The following Patent Document 1 discloses an example of an elastic pavement material. This document proposes an elastic pavement material with high utilization efficiency of elastic chip materials such as waste tires, and claims that the cost can be greatly reduced as compared with the conventional one.

JP 2004-190441 A

  In recent years, further promotion of resource reuse has been demanded from the viewpoint of environmental protection, and in that respect, it can be said that the elastic pavement material that efficiently uses waste tires and the like in Patent Document 1 is effective. However, in recent years, there has been a tendency for waste tires and the like to be insufficient, and at the same time, there are resources that are discarded without being reused. Therefore, it is desired to develop a pavement material that promotes the reuse of resources by looking beyond the waste material considered in Patent Document 1.

  There is a rubber piece generated at the time of manufacturing a tire that can be used as a paving material but is only discarded at present. Tires are usually manufactured by injection molding, but at this time, the rubber remaining in the vicinity of the injection port is hardened as it is. Since this part becomes an unnecessary part as a tire, it is removed and discarded. If a pavement material is created using this rubber piece, reuse of waste material is promoted, which is preferable. However, in the prior art, it has not been proposed to produce a pavement material using the rubber piece.

  In general, when performing injection molding, a release agent for facilitating removal from a mold is often used. The surface of the rubber piece may also be covered with, for example, a release agent containing silicon as a component. Therefore, when such a rubber piece is used as a paving material, it is necessary to consider some treatment so that the adhesive performance between the rubber piece and the urethane resin binder is not reduced by the release agent.

  Therefore, in view of the above problems, the problem to be solved by the present invention is a pavement created by using a rubber material that has been discarded in the past and further devising not to reduce the adhesion performance between the rubber material and the urethane resin. To provide materials.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, a pavement material according to the present invention is a pavement material for performing elastic pavement, and in a tire manufactured by rubber by injection molding, the rubber remaining in the vicinity of the injection port is solidified. The stick-shaped rubber protrusion formed in this way is formed by removing from the tire with the release agent adhering to the surface, and the release agent adhering to the surface is removed by the toluene solvent, rubber material 20mm in the axial direction length of exposed 1mm, and the rod of the trim range from radial length 1mm of 7 mm, were mixed with the trim to adhere to what its trim, and a resin binder by a urethane resin , Provided.

  Thus, in the pavement according to the present invention, in the pavement in which the material including the rubber piece and the resin is mixed, the rubber piece uses a portion removed as an unnecessary portion after molding in the rubber injection-molded product. Therefore, it is possible to effectively use waste materials that have not been reused in the past, and to deal with shortages of other waste materials such as waste tires.

  Further, the material may include a separating material having a performance of separating a release agent on the surface of the rubber piece.

  Thereby, when the unnecessary part in the rubber injection-molded product is reused, it is possible to suppress the release agent from reducing the adhesive performance between the rubber piece and the resin. Therefore, combined with the above effects, it is possible to realize a pavement material that does not reduce the bonding performance while effectively using the waste material that has been discarded so far.

  Further, the material may include an adhesion reinforcing material that reinforces the adhesion between the rubber piece and the resin.

  Thereby, it can suppress that the adhesive performance of a rubber piece and resin reduces by a mold release agent by mixing an adhesion reinforcing material when reusing the unnecessary part in the injection-molded product of rubber. Therefore, combined with the above effects, it is possible to realize a pavement material that does not reduce the bonding performance while effectively using the waste material that has been discarded so far.

  The rubber injection-molded product may be a tire. Accordingly, by reusing unnecessary portions at the time of injection molding that are discarded in large quantities when tires are mass-produced, it is possible to contribute to effective use of resources and environmental protection, and it is possible to cope with a shortage of waste tires.

  Moreover, you may use the said pavement material as a filler in artificial turf. Thereby, the artificial turf which has moderate cushioning property by the cushioning property which the rubber piece contained in the pavement material has, and has a touch close to natural turf is obtained. Furthermore, since the rubber piece that effectively uses the waste material is used, an artificial turf can be realized by effectively using the waste material.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 shows a paving material 1 as a first embodiment of the present invention and a manufacturing process thereof.

  FIG. 1A shows a material for making the pavement material 1. The material is trim 4 (also called spill or dent), solvent (separator) such as toluene 5, and urethane resin 6. The solvent such as toluene 5 may be liquid, and the urethane resin 6 may be liquid before the treatment shown below. The trim 4 includes a rubber piece 2 and a silicon film 3 that covers the surface of the rubber piece 2. A method of creating the trim 4 is shown in FIG. 1, 2 and 3 are sectional views. In the drawing, the thickness of the silicon film 3 and the like is exaggerated.

  As shown in FIG. 3, the trim 4 is made from the tire 10. The tire 10 is created by injection molding. At that time, the rubber remaining in the vicinity of the injection port is solidified to form the protrusion 2. The surface of the tire 10 is covered with a release agent film 3 (silicon film) containing, for example, silicon as a component for facilitating removal from the mold. Since the protrusion 2 is an unnecessary part for the tire, it is removed.

  The removed protrusion 2 and the silicon film 3 on the surface thereof are referred to as a trim 4 (or spill or dent). The shape of the trim 4 is, for example, a rod shape, and the size thereof is about 1 to 20 mm in the axial direction and about 1 to 7 mm in the radial direction (diameter) depending on the size of the tire 10. Since the protrusion 2 is removed to form a rubber piece, the rubber piece is also indicated by the same symbol 2.

  Returning to FIG. 1, a method for creating the pavement material 1 will be described. First, trim 4 and toluene 5 are mixed. The trim 4 may be mixed with other rubber chips. As a result, toluene 5 adheres to the surface of the trim 4 as shown in FIG. 1B. By continuing mixing in this state, the toluene 5 cleans the trim 4 and the silicon film 3 on the surface of the trim 4 is removed. Is done. When the trim 4 is washed at room temperature for about 4 to 10 minutes, the toluene 5 evaporates.

  Therefore, only the rubber piece 2 remains as shown in FIG. Thereafter, the urethane resin 6 and the rubber piece 2 are mixed, whereby the urethane resin 6 covers the rubber piece 2 as shown in FIG. After mixing with the rubber piece 2, the urethane resin 6 becomes all solid at room temperature for 12 to 48 hours. In this way, (elastic) paving material 1 is obtained.

  Next, FIG. 2 shows a paving material 1a as a second embodiment of the present invention and its manufacturing process. FIG. 2A shows a material for making the pavement material 2. The materials are trim 4, surface treatment agent 7 (adhesion reinforcing material), and urethane resin 6. Both the surface treatment agent 7 and the urethane resin 6 may be liquid at the stage before the following treatment. The surface treating agent 7 may be polyhydric alcohols such as polybutadiene.

  First, the trim 4 and the surface treatment agent 7 are mixed. Thereby, the surface treatment agent 7 coats the surface of the trim 4 as shown in FIG. In this case, for example, when the surface treatment agent 7 has a solvent portion, only the solid content of the surface treatment agent 7 is coated on the trim 4 and the remaining solvent component evaporates.

  In this state, the urethane resin 6 is further mixed. As a result, as shown in FIG. 2C, the urethane resin 6 further covers the rubber pieces 2 (and the silicon film 3 and the surface treatment agent 7) from the outside, and bonds the rubber pieces 2 together. At this time, the surface treatment agent 7 functions as an adhesion reinforcing agent that reinforces the adhesion between the rubber piece 2 and the urethane resin 6. As described above, the urethane resin 6 becomes a solid in about 12 to 48 hours at room temperature after mixing. In this way, (elastic) paving material 1a is obtained.

  The experimental results regarding the pavement materials 1 and 1a are shown in FIGS. First, FIG. 4 shows the blending ratio (weight ratio) of the four specimens used in the experiment. Test bodies 1-1 and 1-2 are paving materials 1a, and test bodies 2-1 and 2-2 are paving materials 1. For example, a polyurethane prepolymer may be used as the urethane resin in FIG.

  FIG. 5 shows the results of tensile strength tests performed on the test specimens 1-1, 1-2, 2-1, and 2-2. Usually, the tensile strength of a paving material obtained by mixing a rubber piece such as rubber waste material and a urethane resin binder often shows a value of 0.5 MPa or less. Therefore, the tensile strength of the pavement materials 1 and 1a according to the present invention shown in FIG. 5 is a good numerical value as a pavement material.

  In addition, FIG. 6 shows the results of an elongation test performed on the test specimens 1-1, 1-2, 2-1, and 2-2. Usually, the elongation of a pavement material in which a rubber piece such as rubber waste material and a urethane resin binder are mixed often shows a value of around 50%. Therefore, the value of the elongation of the pavement materials 1 and 1a according to the present invention shown in FIG. 6 is a good value as a pavement material. In the test of FIGS. 5 and 6, F-4 and F-10 manufactured by Yokohama Elastic Pavement System Co., Ltd. were used for the urethane resin and toluene in the components of FIG. As described above, the surface treating agent 7 was a polybutadiene-based polyhydric alcohol or polybutadiene polyol. The tests of FIGS. 5 and 6 were performed in accordance with the standard of JIS K 6251.

  The results shown in FIGS. 5 and 6 indicate that the pavement materials 1 and 1a having good performance can be obtained from the trim 4 by cleaning the silicon film 3 with toluene 5 and reinforcing adhesion with the surface treatment agent 7 described above. It is shown that. The good results as shown in FIGS. 5 and 6 are not limited to the specimen shown in FIG. 4. For example, the weight ratio of the trim 4 may be between 80 and 100, and the range of 10% above and below the value shown in FIG. Good results can be obtained even with specimens having a weight ratio of. Moreover, the knowledge that the effect equivalent to the above or a more favorable effect is acquired by the composite process which performs the adhesion reinforcement | strengthening by the surface treating agent 7 after washing | cleaning with toluene 5 is also acquired.

  As described above and as shown in FIG. 4, other rubber chips may be mixed with the trim 4 in the pavement materials 1, 1 a. Here, the other rubber chips may be prepared by cutting old tires, melting waste rubber, or the like. The blending ratio of trim 4 and other rubber chips is the same as in FIGS. 5 and 6 even if trim 4 is 10%, rubber chip is 90%, trim 4 is 100% and rubber chip is 0%. can get.

  The pavement materials 1 and 1a of the present invention described above can be used for roads, track and field stadiums, and the like. However, the embodiments of the paving material of the present invention are not limited thereto. Another embodiment is shown in FIG. FIG. 7 shows an example of an artificial turf using the pavement materials 1 and 1a of the present invention described above as a filler.

  The artificial turf 20 includes an artificial turf thread 11, a cushion yarn 12, a base fabric 13, and a base 14. The artificial turf yarn 11 may be, for example, a long pile (leaf stem) artificial turf. The cushion yarn 12 is disposed in order to enhance cushion performance. For example, the base fabric 13 may be front permeable. This makes it possible to play with a small amount of precipitation. The base 14 may be, for example, an open grain ascon layer or a water permeable layer.

  The artificial turf 20 includes the pavement materials 1 and 1a of the present invention as a filler. The gap between the artificial turf yarns 11 is filled with the fillers (paving materials) 1 and 1a. With such a configuration, the feel of the artificial turf 20 is close to that of natural turf due to the elasticity of the fillers 1, 1 a, and burns and frictional scratches are less likely to occur during sliding.

  For example, silica sand may be mixed in the fillers 1 and 1a. By mixing silica sand with the pavement materials 1 and 1a, it becomes closer to the touch of the natural ground. Therefore, it can be made closer to the feeling that natural grass is planted on the natural ground. In that case, for example, it has been found that if silica sand is distributed at 10 to 40 kg per square meter and fillers 1 and 1a are distributed at 5 to 30 kg per square meter, it is suitable for the above effect. Similarly, the length of the fillers 1 and 1a is preferably 25 to 100 mm for the above effect.

  As shown in FIG. 3, the rubber piece 2 of the present invention is an unnecessary part in the injection molding, so that the shape is almost uniform. Therefore, the pavement materials 1 and 1a have a good appearance with a uniform surface and also have an effect that the elastic performance becomes uniform.

  In the above embodiment, the silicon film 3 constitutes a release agent. Toluene 5 constitutes a separating material. The surface treatment agent 7 constitutes an adhesion reinforcing material.

The figure which shows the pavement material in Example 1 of this invention, and its manufacturing process. The figure which shows the pavement material in Example 2 of this invention, and its manufacturing process. The figure which shows the manufacturing method of a rubber piece. The figure which shows the compounding ratio of a test body. The figure which shows the result of a tensile strength test. The figure which shows the result of an elongation test. The figure which shows the artificial turf using the pavement material of this invention as a filler.

Explanation of symbols

1, 1a Pavement material (filler)
2 Rubber pieces 3 Silicon film (release agent)
4 Trim 5 Toluene (separating material)
6 Urethane (urethane resin, urethane resin binder)
7 Surface treatment agent (adhesion reinforcement)
20 Artificial grass

Claims (5)

A pavement material for performing elastic pavement,
In a tire manufactured from rubber by injection molding, a stick-shaped rubber protrusion formed by solidifying the rubber remaining in the vicinity of the injection port is removed from the tire with a release agent attached to the surface. is, with the release agent adhering to the surface is removed by the solvent toluene, and 20mm from 1mm axial length material is exposed rubber, radial length of the rod-shaped ranges from 1mm to 7mm trim surface,
The mixed trim to adhere to what its trim, and a resin binder by a urethane resin,
A pavement material characterized by comprising. A pavement material for performing elastic pavement,
In a tire manufactured from rubber by injection molding, a stick-shaped rubber protrusion formed by solidifying the rubber remaining near the injection port is formed by removing it from the tire with a release agent attached to the surface. A rod-shaped trim having an axial length of 1 mm to 20 mm and a radial length of 1 mm to 7 mm ;
A surface treatment agent for polyhydric alcohols mixed with the trim having a release agent attached to the surface and coated with the trim ;
A resin binder made of urethane resin mixed with the trim to bond the trims coated with the surface treatment agent of polyhydric alcohol ;
A pavement material characterized by comprising. A pavement material for performing elastic pavement,
In a tire manufactured from rubber by injection molding, a stick-shaped rubber protrusion formed by solidifying the rubber remaining near the injection port is formed by removing it from the tire with a release agent attached to the surface. A rod-shaped trim having an axial length of 1 to 20 mm and a radial length of 1 to 7 mm in which the release agent attached to the surface is removed by a solvent of toluene and the rubber material is exposed on the surface;
A surface treatment agent for polyhydric alcohols, the surface of which is mixed with the exposed rod-shaped trim of the rubber material to coat the surface,
A resin binder made of urethane resin mixed with the trim to bond the trims coated with the surface treatment agent of the polyhydric alcohol ;
A pavement material characterized by comprising.   The pavement material according to claim 2 or 3, wherein the surface treatment agent is a polybutadiene-based polyhydric alcohol.   Artificial grass using the pavement according to any one of claims 1 to 4 as a filler.

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