JP2000273809A - Water-permeable elastic pavement material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve function by binding vulcanized rubber chip aggregates with an urethane resin, polishing the surface to expose the aggregates, and setting the porosity of a pavement material to a specific value. SOLUTION: Vulcanized rubber chip aggregates are bound by an urethane resin binder, the whole surface is polished to expose the aggregates on the surface, and a water-permeable elastic pavement material having the porosity of 20-40% is formed. Fibered rubber chips having the width of 1-2 mm and the length of 1-15 mm or granular rubber chips having the diameter of 2-10 mm are contained in the aggregates at the weight ratio of 90% or above for the whole vulcanized rubber chips. This pavement material can eliminate the effect of a slip caused by the existence of the highly slippery urethane resin on the pavement surface when fine scars are formed on the urethane resin binder stuck on the vulcanized rubber chip surface or the binder on the surface is removed. The frictional resistance on the pavement material surface can be sharply increased in the wet state, and excellent water permeability, elasticity and sound absorbing characteristic can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic pavement material having a large frictional force when wet and having excellent water permeability, elasticity and sound absorbing properties.

[0002]

2. Description of the Related Art In recent years, various resin pavements have been used for floors on paved roads, floors of outdoor sports facilities such as tennis courts and grounds, and floors above floors. Among them, pavement with polyurethane resin is easy to construct, wear resistance,
It is widely used because of its excellent properties such as smoothness and appearance. However, slippage is high because the pavement surface is excellent in smoothness, and slip tends to occur particularly when the floor surface is wet in rainy weather or the like.

[0003] Therefore, before the resin on the pavement surface is cured, inorganic aggregates such as sand and glass beads are sprayed, and these aggregates are exposed on the floor surface to form projections.
Attempts have been made to increase the frictional force of the pavement floor surface with a polyurethane-based resin by physical resistance. However, although inorganic bone has high strength of the bone itself,
Since the adhesive strength with a binder such as a polyurethane resin is weak, the aggregate is easily peeled off to generate dust, and the strength of the pavement floor is reduced.

JP-A-6-146209 discloses a resin-paved surface in which a material containing micro-hollow spheres is applied to a thixotropic polyurethane material to expose the micro-hollow spheres on the surface. But in this case
(1) There is a problem that the water permeability of the pavement surface cannot be obtained, and (2) the thixotropic property (thixotropic property) of the resin varies depending on the season, and a constant performance cannot be obtained.

[0005] Further, in place of the above-mentioned inorganic aggregates, vegetable aggregates such as walnut shells, peach nuclei, and corn cobs are used so that even if dust is generated, the influence on the environment is reduced. However, since the aggregate is a natural material, there is a problem that mold grows or rots, the adhesive strength with the binder is reduced, and the appearance is impaired.

[0006]

Problems to be Solved by the Invention
In JP-A No. 1 (1993) -2000, a rubber chip elastic layer obtained by solidifying a rubber chip with a urethane resin binder and a synthetic resin layer containing an inorganic aggregate are laminated in this order on a water-permeable base, and the inorganic aggregate is subjected to buffing or the like. An elastic pavement block formed to be exposed on a surface is disclosed.

This elastic pavement block is provided with a large number of slits of about 3 to 6 mm on the surface in order to ensure water permeability, has a large slip resistance (BPN) of 55 when wet, and has a pavement even when wet. The surface has sufficient frictional resistance. However, the synthetic resin layer of the elastic pavement block must be free of voids (or air bubbles) in order to prevent the inorganic aggregate from slipping off. It is easily presumed that some excellent sound absorbing properties are significantly impaired. This sound absorption characteristic leads to a noise reduction effect, and is particularly important in an urban area with a large traffic volume.

Further, since the synthetic resin layer does not have voids, the above-mentioned slit is required to ensure the water permeability of the elastic pavement block. Therefore, it is disadvantageous from the viewpoint of manufacturing cost. Further, the synthetic resin layer itself needs to have a high hardness in order to hold a high strength inorganic aggregate, and in the above-mentioned publication, a resin having a high hardness of 80 to 100 as JIS A hardness after curing is used. ing. Therefore, it is necessary to form a two-layer structure with the rubber chip elastic layer in order to secure the elasticity of the entire pavement block, and such a point is disadvantageous in terms of manufacturing cost.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a highly durable elastic pavement material which has a high sliding friction force when wet and can be formed by a simple method. An object of the present invention is to provide an elastic pavement material having excellent properties.

[0010]

In order to solve the above-mentioned problems, a water-permeable elastic pavement material according to the present invention has an aggregate made of vulcanized rubber chips joined with a urethane resin binder so that the aggregate is exposed on the surface. In addition, the entire surface is polished, and the porosity of the elastic pavement material is 20 to 40%.

The water-permeable elastic pavement material of the present invention uses a vulcanized rubber chip as an aggregate, and the adhesiveness between the vulcanized rubber chip and the urethane resin binder is good. Very unlikely to occur. Therefore, an elastic pavement material having excellent durability can be obtained. In addition, since the vulcanized rubber chips are bonded to each other by a urethane resin binder and have a sufficient gap so that the porosity is within a predetermined range, sufficient water permeability can be obtained without providing a separate slit or the like. Can be demonstrated and maintained.

An elastic pavement block formed by molding a rubber chip material with a urethane resin binder and having a porosity of 30 to 40% has already been proposed (JP-A-4-131404). However, in the above-mentioned elastic pavement block, a rubber chip is bonded with a predetermined amount of a urethane resin binder,
Sufficient water permeability is realized only by setting the porosity within a predetermined range, and therefore no consideration is given to polishing the surface.

On the other hand, in the above-mentioned elastic pavement material of the present invention, fine scratches are formed on the urethane resin binder adhering to the surface of the vulcanized rubber chip by subjecting the entire surface of the water-permeable elastic pavement material to a polishing treatment. And removes the binder itself on the surface.As a result, the effect of slippage caused by the presence of highly slippery urethane resin on the pavement surface is eliminated as much as possible. The remarkable effect of remarkably improving the frictional resistance of the pavement material surface is obtained. It should be noted that such findings have not been found at all, and have been newly found by the present inventors.

Furthermore, the water-permeable elastic pavement material of the present invention has a simpler structure than the elastic pavement members disclosed in JP-A-4-52301 and JP-A-8-109604, and can reduce the manufacturing cost. There are advantages.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the water-permeable elastic pavement material of the present invention will be described in detail. The vulcanized rubber chip used as an aggregate in the water-permeable elastic pavement floor of the present invention includes, for example, a fibrous rubber chip obtained by grinding a tire tread portion at the time of manufacturing a recycled tire, or a vulcanized rubber such as a waste tire. Granular rubber chips obtained by crushing with a crusher can be used.

In the present invention, the aggregates having a weight ratio of 90% or more of all vulcanized rubber chips have a width of 1 to 2%.
It is preferably a fiber-shaped rubber chip having a diameter of 1 to 15 mm or a granular rubber chip having a diameter of 2 to 10 mm. That is, the ratio of the fiber-shaped rubber chips having a relatively large aspect ratio to the total vulcanized rubber chips, or the particle size is large enough not to hinder the smoothness of the pavement surface, and the particle size is large enough that the voids between the rubber chips are not too small. It is preferable that the ratio of the granular rubber chips having a small diameter is 90% or more by weight.

When the content of the vulcanized rubber chips having the width, length or diameter in the above-mentioned range is less than 90% by weight, the frictional force on the pavement surface cannot be made sufficient, or vulcanization cannot be performed. When bonding the rubber chips with the urethane resin binder, it is not possible to secure a sufficient space, and there is a possibility that the porosity of the pavement material is reduced. The urethane resin binder used to bind the skeleton in the water-permeable elastic pavement floor of the present invention is not particularly limited, but from the viewpoint of good moldability, one-part urethane resin, especially moisture It is preferable to use a curable one-component urethane resin.

A surface treatment agent or a catalyst may be used in the urethane resin binder in order to improve the adhesion to the vulcanized rubber chip or to promote the curing. The porosity of the water-permeable elastic pavement material of the present invention is 20 to 40%, preferably 30 to 40%.
It is set in the range of ~ 35%. If the porosity is less than 20%, the water permeability becomes low, and the dimensional change when the mold is released from the mold becomes large. Conversely, if the porosity exceeds 40%, the strength required for the elastic pavement material cannot be obtained,
The durability of the elastic pavement floor decreases. The strength required for the elastic pavement material is, for example, 10 kg / cm in tensile strength.
² or more, preferably 15 kg / cm ² or more, more preferably 15~30kg / cm ^2.

In the water-permeable elastic pavement material of the present invention, the above-described aggregate and the urethane resin binder are mixed at a ratio corresponding to a desired porosity, and the mixture is charged into a mold having a desired shape.
It is obtained by subjecting the surface to a polishing treatment after press working with a press molding machine. As described above, the mixing ratio of the aggregate and the urethane resin binder is appropriately set in accordance with the porosity of the elastic pavement material. ~ 3
What is necessary is just to mix | blend in the range of about 0 weight part. By setting the porosity in such a range, the porosity can be set in the aforementioned range.

The conditions for the pressing are not particularly limited, but usually, the pressing may be performed at 120 to 160 ° C. for about 10 to 20 minutes. The polishing treatment is performed for the purpose of making a fine scratch on the urethane resin binder attached to the surface of the vulcanized rubber chip as the aggregate, or removing the urethane resin binder. The method of the polishing treatment is not particularly limited, and various conventionally known methods can be used as long as the above object can be achieved. The degree of the polishing treatment is, for example, 1
A process of polishing about 0 reciprocations is sufficient.

The water-permeable elastic pavement material of the present invention is used, for example, by fixing it on a paved surface (base) via an adhesive.

[0022]

(Production of elastic pavement material)

Example 1 and Comparative Example 1 The aggregate had a fibrous rubber chip (average width 1-2 mm, average length 2-2) obtained by grinding the tread portion of the tire.
15 mm).

100 parts by weight of the above-mentioned fiber-like rubber chip and 25 parts by weight of a urethane resin binder (“Pantex TP-1221” manufactured by Dainippon Ink and Chemicals, Inc.) were mixed.
Press molding length 300mm, width 300mm, thickness 3
It was molded to 0 mm. Press molding conditions are 150 ° C, 20
And the porosity was adjusted to be 30%. The surface of the elastic pavement material thus obtained was polished by hand using sand paper No. 60 for about 10 seconds as Example 1, and the one without polishing treatment was Comparative Example 1.

Examples 2 to 5 and Comparative Examples 2 to 5 Elastic pavement materials were prepared in the same manner as in Example 1 or Comparative Example 1, except that the compounding amount and porosity of the urethane resin binder were adjusted to the values shown in Table 1, respectively. I got Examples 2 to 5 each had a surface subjected to polishing treatment, and Comparative Examples 2 to 5.
No. 5 was not subjected to any polishing treatment.

Example 6 and Comparative Example 6 In the same manner as in Example 1 or Comparative Example 1, except that a granular rubber chip (having a diameter of 4 to 6 mm) obtained by grinding a waste tire was used instead of the fiber-like rubber chip. Thus, an elastic pavement material was obtained. Example 6 was subjected to polishing treatment, and Comparative Example 6 was not subjected to polishing treatment.

In order to measure the frictional force of the control urethane resin when wet, it is preferable to form an elastic pavement with the urethane resin itself. However, a moisture-curable one-pack polyurethane having a thickness of about 2 mm is prepared. Even in the case, bubbles are generated during curing,
Its fabrication is very difficult. Therefore, by making the porosity extremely small and increasing the ratio of resin, a uniform resin layer is formed almost entirely on the surface of the elastic pavement material corresponding to the lower side of the mold by resin dripping. Controls were used.

That is, an elastic pavement material was obtained in the same manner as in Example 1 except that the amount of the urethane resin binder and the porosity were adjusted to the values shown in Table 1, respectively. (Measurement of porosity) The porosity of the elastic pavement material obtained in each of Examples, Comparative Examples, and Controls was calculated based on the total volume of the aggregate made of vulcanized rubber and the resin binder used in the production of the elastic pavement material (raw material mixture). Volume) and the volume (mold volume) of the mold used to produce the elastic pavement material, using the following equation (1).

[0028]

(Equation 1)

(Measurement of Tensile Strength) In each of Examples, Comparative Examples and Controls, a sheet-like elastic pavement material having a thickness of 10 mm was prepared as a sample, and was subjected to the provisions of JIS K 6251 "Tensile test method for vulcanized rubber". Tensile strength (kg / cm
² ) was measured. (Sliding friction test when wet) The surface of the sample was wetted with water for about 30 minutes, and a sliding friction test was performed using a portable skid resistance tester.

The evaluation of the sliding friction test is based on the reading BPN (British Pend) of a portable skid resistance tester.
ulum Number). The greater the value of BPN, the less slippery. The BPN value when wet is preferably 55 or more, more preferably 60 or more. If the BPN value is less than 55, the effect of suppressing slippage may be insufficient.

Table 1 shows the measurement results of the blending amount of the urethane resin binder and the vulcanized rubber chip, the porosity of the elastic pavement material, and the tensile strength in each of Examples, Comparative Examples, and Controls. Table 2 shows the results of the sliding friction test.

[0032]

[Table 1]

[0033]

[Table 2]

As is clear from Tables 1 and 2, when the polishing treatment was performed, a large sliding friction force was obtained, whereas when the polishing treatment was not performed, the sliding friction force was low.
It was not enough to suppress slippage when wet. Since the elastic pavement materials of the above examples all have a sufficient porosity, they have good water permeability when wet, and can also maintain excellent sound absorbing properties. Also, the tensile strength was high, and excellent durability could be maintained.

[0035]

As described in detail above, according to the present invention,
An elastic pavement material having a large frictional force when wet and having excellent water permeability, elasticity and sound absorbing properties can be obtained. Such an elastic pavement material is suitable for various resin pavements on floors such as paved roads, floors of outdoor sports facilities such as tennis courts and grounds, and upper floors.

Claims (3)

[Claims] An elastic pavement material in which an aggregate comprising vulcanized rubber chips is bonded with a urethane resin binder, and the entire surface is polished so that the aggregate is exposed on the surface.
A water-permeable elastic pavement, wherein the porosity of the elastic pavement is 20 to 40%. 2. A vulcanized rubber chip having a weight ratio of 90%
% Or more, width 1 to 2 mm and length 1 to 15 mm
The elastic pavement material according to claim 1, which is a fiber-like rubber chip or a granular rubber chip having a diameter of 2 to 10 mm. 3. The elastic pavement material according to claim 1, wherein said urethane resin binder is a one-part urethane resin.