JP2000352004A - Elastic pavement structure and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve tensile strength and durability by adding chlorine- containing compound to vulcanized rubber chips, kneading the same, and adding urethane resin binder to form a hardened rubber chip layer on a pavement base material. SOLUTION: After the ground in a pavement place is leveled and compressed, asphalt, concrete or the like is cast to obtain a pavement base material 2. A rubber chip layer 3 is formed on the upper surface of the base material 2, and a coat layer 4 is formed at need. The rubber chip layer 3 is formed by adding a pre-treatment agent to vulcanized rubber, kneading the same for coating, and then adding urethane resin binder to be hardened. The pre- treatment agent is chlorine containing compound, and inorganic or organic compounds such as hydrochloric acid, thionyl chloride, carbon tetrachloride and the like, and the rubber chip is formed by crushing vulcanized rubber such as natural rubber, styrene butadiene rubber and the like. Waste material obtained by crushing rubber products such as a tire or the like may be used. Thus, tensile strength and durability can be improved, and it can be manufactured at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic pavement structure used for a general pavement, a road, a promenade on a riverbed, a golf course, a tennis court, a stadium, and the like. In particular, the present invention relates to an elastic pavement structure that can be used in a place where people walk with shoes having metal projections such as spikes, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as an elastic pavement structure paved on a tennis court, an athletic stadium or a variety of athletic grounds, or a footpath of a golf course, when a person exercises or competes,
An elastic pavement structure made of vulcanized rubber is often used because no load is applied to the waist, knees, and the like, and the repair is simple. In this kind of elastic pavement structure, a urethane resin-based binder is injected into a vulcanized rubber chip to bond and integrate the vulcanized rubber chip with each other, but the bonding force is not always sufficient and there is a problem in durability. Therefore, there is the following conventional technique for solving the problem.

[0003] Japanese Patent Application Laid-Open No. 2-128003 discloses that before a vulcanized rubber chip and a predetermined amount of a binder are charged and mixed in a mixer, a silane coupling agent is added to the vulcanized rubber chip stirred by the mixer. Spraying in the form of a mist in a state of being dissolved in an inert organic solvent, performing surface treatment of the vulcanized rubber chip, then adding the predetermined amount of the binder and stirring with a mixer to produce an elastic pavement. Is disclosed.

Japanese Patent Application Laid-Open No. Hei 7-268005 discloses a rubber chip pretreatment method comprising a solution containing a triazine derivative, and an elastic pavement structure obtained by the method.

However, these vulcanized rubber surface treatment methods are generally expensive and impractical. Further, the elastic pavement structure obtained by these methods does not always have sufficient tensile strength and durability.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an elastic pavement structure using a vulcanized rubber chip, which improves the tensile strength and durability of the elastic pavement structure and can be manufactured at low cost. The purpose is to provide.

[0007]

According to the present invention, there is provided an elastic pavement structure having a vulcanized rubber chip layer formed on a pavement substrate, wherein the vulcanized rubber chip is pretreated with a chlorine-containing compound. It is the said elastic pavement structure.

The present invention further provides a vulcanized rubber chip, on which a pretreatment agent comprising a chlorine-containing compound is added and kneaded to cover the vulcanized rubber chip, and then a urethane resin binder is added and cured to cure the rubber chip layer. A method for producing an elastic pavement structure, characterized in that:

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

In the elastic pavement structure of the present invention, as shown in FIG. 1, a rubber chip layer 3 is laminated on a pavement base material 2 with a binder such as urethane resin, and the upper surface thereof is optionally provided. The coating layer 4 is formed of urethane resin to prevent the rubber chip layer from being partially peeled. Here, the pavement substrate 2 is a layer made of asphalt, concrete or asphalt-concrete.

In the present invention, as the chlorine-containing compound for pre-treating the vulcanized rubber chip, inorganic and organic compounds such as sodium hypochlorite, hydrochloric acid, thionyl chloride, calcium hypochlorite, chloroform, carbon tetrachloride, chlorinated alkyl and the like can be used. A chlorine-containing compound can be used, and chlorine gas can also be used. Here, when an inorganic compound is used, it is preferably used as an aqueous solution, and when an organic compound is used, it is preferably used after being diluted with an organic solvent.

Suitable organic solvents include ethyl acetate, acetone, toluene, methyl ethyl ketone and the like.
Ethyl acetate and acetone are particularly preferred. The reason is that it is easy to handle in terms of solubility, workability and economy. The viscosity of the organic solvent used in the pretreatment agent of the present invention is 2000 c.
P or less, and particularly preferably 500 cP or less. If the viscosity of the pretreatment agent is too high, the rubber chip cannot be uniformly wetted when the rubber chip and the pretreatment agent are kneaded.

The treating agent of the present invention is obtained by mixing the above essential components. Further, the pretreatment agent used in the present invention may contain additives such as a triazine solution, a silane coupling agent, and chlorinated polyolefins, if necessary, in addition to the above essential components.

As the rubber chips used in the elastic pavement structure of the present invention, those obtained by pulverizing vulcanized rubber such as natural rubber, styrene butadiene rubber, nitrile rubber, butyl rubber, polyurethane rubber, polybutadiene rubber, and ethylene propylene rubber are used. What can be used as the above-mentioned rubber chip may be a crosslinked rubber, and may be a waste material obtained by grinding rubber products such as tires and belts of belt conveyors. Particle size of vulcanized rubber is 0.3-5m
m, especially 0.5 to 2.5
mm. If the particle size is less than 0.3 mm, the porosity cannot be sufficiently secured and the water permeability becomes insufficient, and if it exceeds 5 mm, the finished surface is not uniform.

Further, in the production of the elastic structure of the present invention, an additive such as a coloring agent may be added. The amount of the coloring agent to be added is 1 to 8 parts by weight, especially 2 to 100 parts by weight of the rubber chip.
It is preferable to use 5 parts by weight because the colorant does not adversely affect the barrier properties and physical properties.

In the method for producing an elastic pavement structure of the present invention, first, water or an organic solvent is added to the above-mentioned chlorine-containing compound,
Mix well by normal methods.

Next, in the method of pre-treating the rubber chips, the pre-treatment agent is added to the vulcanized rubber chips and kneaded, and the vulcanized rubber chips are sufficiently covered with the pre-treatment agent. The rubber chips are pretreated by a pretreatment method, and the above-mentioned kneaded material is mixed with the above-mentioned urethane resin binder, kneaded, and cured to obtain an elastic pavement structure.

In producing the elastic pavement structure of the present invention, at least a vulcanized rubber chip, a pretreatment agent, and a urethane resin binder are used. The amount of the pretreatment agent used in the production of the elastic pavement structure of the present invention depends on the urethane resin binder 1
It is preferably in the range of 1 to 20 parts by weight with respect to 00 parts by weight, and particularly preferably in the range of 2 to 5 parts by weight from the viewpoint of improvement in physical properties and production cost. The amount of the urethane resin binder is 1 to 100 parts by weight of the rubber chip.
The content is preferably in the range of 5 to 35 parts by weight, particularly preferably 20 to 35 parts by weight.
Adding in the range of 30 parts by weight, physical properties, water permeability,
It is preferable from the viewpoint of manufacturing cost.

As the urethane resin binder used in the elastic pavement structure of the present invention, an organic isocyanate such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate (TDI), or a mixture thereof, diphenylmethane isocyanate ( MDI), liquid diphenylmethane diisoanate, a composition of tolylene diisocyanate, and the like.

Specific examples include Takenate F-139-1 (manufactured by Takeda Pharmaceutical Co., Ltd.) and SBU-1-0620 (manufactured by Sumitomo Bayer Urethane Co., Ltd.).

The isocyanate (NCO) group content in the urethane resin binder is 2 to 20% by weight, preferably 5 to 20% by weight.
１５15% by weight. If it is less than 2% by weight, the bonding force between the rubber chips is not sufficient, and if it exceeds 20% by weight, the binder layer is liable to foam, the bonded product becomes hard and the whole becomes brittle.

The viscosity of the urethane binder is 1500 to 8
000 cP, particularly preferably in the range of 2,500 to 5,000 cP, is preferable in view of the kneading workability of the rubber chip and the fluidity of the binder.

The elastic pavement structure of the present invention is installed on the ground such as a general pavement, a road, a golf course, a stadium and the like. As an example of the construction method of the elastic pavement structure of the present invention, the ground leveled by setting up a hollow or a frame on the ground of the pavement site,
After the ground is compressed and compressed, asphalt, concrete or asphalt concrete material is poured and allowed to stand and molded to obtain the pavement base material 2. The rubber chip layer 3 is formed on the upper surface of the obtained base material. If desired, the coating layer 4 may be formed on the upper surface of the rubber chip layer. The coating layer 4 may be loaded or applied before or after the rubber chip layer 3 is cured.

[Examples] Vulcanized rubber chips (particle diameter: 2 to 3 mm) were coated with various surface treatment agents shown in Table 1, and a urethane resin binder was added thereto and kneaded.
mm sheet was prepared. This was sliced to a thickness of 7 mm, punched out into a JIS standard No. 2 dumbbell (JIS K6251), and a tensile test was performed. FIG. 2 shows the relationship between the amount of the surface treatment agent and the tensile strength. As can be seen from the drawing, the examples of the present invention show excellent tensile strength when the ratio of the surface treating agent to the urethane resin binder is in the range of 1 to 20% by weight.

[0025]

[Table 1]

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0027]

According to the present invention, since the rubber chips are surface-treated with a chlorine-containing compound, the rubber chips are firmly bonded to each other with a urethane resin binder, so that the tensile strength and durability of the elastic pavement structure are improved, and the elasticity is reduced at a low cost. A pavement structure can be manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view of an elastic pavement structure of the present invention.

FIG. 2 is a graph showing the relationship between the amount of a surface treatment agent and tensile strength.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elastic pavement structure 2 Pavement base material 3 Rubber chip layer 4 Coating layer

Claims (4)

[Claims] 1. An elastic pavement structure having a vulcanized rubber chip layer formed on a pavement substrate, wherein the vulcanized rubber chip is pretreated with a chlorine-containing compound. body. 2. The elastic pavement structure according to claim 1, wherein the chlorine-containing compound is a hypozinc acid-based bleach. 3. A vulcanized rubber chip, a pretreatment agent comprising a chlorine-containing compound is added and kneaded on the pavement base material to coat the vulcanized rubber chip, and then a urethane resin binder is added and cured to form a rubber chip layer. A method for producing an elastic pavement structure, characterized in that it is formed. 4. The method according to claim 3, wherein a coating layer is formed on the upper surface of the rubber chip layer.