JP2007170039A - Elastic paving material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic paving material capable of ensuring adhesion to an underlayer even if a primer is not used, carrying out construction work within a short time accordingly and having no problem in terms of safety. <P>SOLUTION: The elastic paving material contains a rubber chip and/or rubber powder, aggregate and a urethane binder, and the elastic paving material is applied on the underlayer without making use of the primer. The urethane binder contains 25 to 35 vol.%. The material preferably contains 45 to 65 vol.% of the rubber chip and/or the rubber powder and 10 to 30 vol.% of the aggregate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elastic pavement material, and more particularly, to an improvement in adhesion of an elastic pavement material using a urethane binder to a base.

  Conventionally, a low noise elastic pavement using a curable resin such as urethane or epoxy as a binder is known as a method of using vulcanized rubber in the form of powder or chips. In addition, an elastic pavement in which rubber chips are mixed with a binder and press-molded is used on sidewalks, playgrounds, roadways, and the like.

  These elastic pavements using rubber chips have excellent effects such as shock absorption during walking and safety during falls due to the elasticity of the rubber chips, and since there are voids inside, in addition to drainage and breathability Therefore, it is also attracting attention as a functional elastic pavement material for reducing traffic noise in urban areas because it is effective in reducing noise generated on tires and road surfaces.

Regarding such an elastic pavement material, for example, in Patent Document 1, as a technique for promoting material recycling, a crushed material of a thermosetting resin molded product and a rubber chip are mixed at a predetermined mixing ratio, and a urethane resin is used as a binder. Pavement materials formed into blocks or plates have been proposed. In Patent Document 2, a lightweight waste such as rubber or plastic is crushed to an appropriate size as an aggregate, and a composition obtained by mixing the aggregate and a binder such as urethane resin is cured. A pavement block is disclosed.
JP 2002-322602 A (Claims etc.) JP 2000-34702 A (Claims etc.)

  By the way, in general, elastic pavement using urethane as a binder is applied by applying a primer to the surface after placing a semi-flexible pavement on the foundation and then applying the elastic pavement on site. Is done. However, in this case, since the solvent system is mainly used for the primer, there is a problem of safety in operation, and it takes time for the primer to be cured.

  Accordingly, an object of the present invention is to provide an elastic pavement material that can ensure adhesion to a base without using a primer, and can therefore be constructed in a short time and has no safety problems.

  As a result of intensive studies to solve the above problems, the present inventor has found that an elastic pavement material capable of ensuring adhesion without a primer can be obtained by limiting the blending amount of the urethane binder to be used within a predetermined range. Thus, the present invention has been completed.

  That is, the elastic pavement material of the present invention is an elastic pavement material containing a rubber chip and / or rubber powder, an aggregate, and a urethane binder, and is constructed on a base without a primer. It contains 25 to 35% by volume of a binder.

  The elastic pavement material of the present invention preferably contains 45 to 65% by volume of the rubber chip and / or rubber powder and 10 to 30% by volume of the aggregate.

  According to the present invention, an elastic pavement material that can secure adhesiveness to the ground without using a primer, and can be constructed in a short time, and has no safety problem, because of the above configuration. It became possible to realize.

Hereinafter, preferred embodiments of the present invention will be described in detail.
The elastic pavement material of the present invention contains a rubber chip and / or rubber powder, an aggregate, and a urethane binder, and is constructed on a base without a primer. It is characterized by containing 35% by volume.

  By setting the proportion of the urethane binder to 25% by volume or more, it is possible to ensure sufficient adhesion to the substrate without using a primer. There will be no problem of conversion. On the other hand, when the urethane binder is used in an amount exceeding 35% by volume, the voids are crushed and the sound absorbing effect is lowered, and it is not preferable from the viewpoint of pavement strength, water permeability, and the like.

  In the elastic pavement material of this invention, what is necessary is just to satisfy | fill the said conditions about the ratio of a urethane binder, About a point other than that, it can comprise suitably according to a conventional method, and it does not restrict | limit in particular.

  The urethane binder in the present invention is not particularly limited, but particularly as a two-component urethane binder, preferably an isocyanate group terminal prepolymer and a polyol in an equivalent ratio of hydroxyl group / isocyanate group, for example, 0. What mixed in 2-0.8 is used. The one-component urethane binder is very difficult to adjust the curing time compared to the two-component urethane binder, is not versatile, and has a difficulty in shortening the curing time.

  An example of an isocyanate-terminated prepolymer of a two-component urethane binder is an isocyanate-terminated prepolymer having an isocyanate content of 5 to 25%, a viscosity of 1000 to 5000 cP (25 ° C.), and an average number of functional groups of the isocyanate-terminated prepolymer of 2 to 3. Can be mentioned. Examples of the isocyanate for the prepolymer include diphenylmethane diisocyanate polyisocyanate. As the active hydrogen compound used for modification, polyalkylene glycol having a molecular weight of about 1000 to 3000 is usually used.

  On the other hand, as an example of the polyol, it is preferable that the average number of functional groups is 2 to 6, the average molecular weight is 1000 or less, and more than half of the hydroxyl groups are primary hydroxyl groups from the viewpoint of reactivity. Examples include glycol, diethylene glycol, and polyalkylene ether glycol.

  The rubber chip and / or rubber powder used in the present invention is blended in an elastic pavement material in order to impart elasticity to the pavement surface, and the material is not particularly limited. Natural rubber, isoprene rubber, styrene -Butadiene rubber, butyl rubber, ethylene-propylene rubber or the like can be used. Such rubber chips and / or rubber powders can also be obtained from waste materials of used vulcanized rubber products such as rubber tires, weather strips, hoses, etc., unnecessary end materials generated during molding, molding defects, and the like. In addition, the particle size of the rubber chip and / or rubber powder can be suitably used from a fine one of 1 mm or less to about 10 mm, especially those having a particle size of about 1 to 5 mm. This is more preferable because it is effective in forming voids.

  The ratio of the rubber chip and / or rubber powder in the elastic pavement material of the present invention is preferably 50 to 60% by volume. If this ratio is too small, the effect as an elastic pavement material is not sufficient. On the other hand, if the ratio is too large, sufficient physical properties to be applied to pavement cannot be obtained, so that neither is preferable.

  Moreover, there is no restriction | limiting in particular as an aggregate used in this invention, Recycled aggregates, such as natural aggregates, such as river gravel and river sand, and crushed stone, slag, concrete, glass, and FRP, can be used. The stone, sand, and the like used for the aggregate are for ensuring the strength and wear resistance of the completed pavement and for exposing to the surface to obtain an anti-slip effect. The stone materials preferably have a function of meshing with each other to disperse the load. For this reason, a sharp object such as a crushed stone is suitable. Further, it is preferable to mix 5% by volume or more of fine aggregate having a particle size of 0.5 mm or less with respect to coarse aggregate having a particle size of 0.5 to 30 mm. As the coarse-grained aggregate, a hard one having a sharp shape like a crushed stone that meshes with each other to form a gap is suitable. On the other hand, the fine-grained aggregate adheres to the surface of the large-sized coarse-grained aggregate and brings about an anti-slip action (polishing effect like sandpaper) on the tire or the like.

  The ratio of the aggregate in the elastic pavement material of the present invention is preferably 15 to 20% by volume. If the ratio of the aggregate in the elastic pavement material is too small, the strength is not sufficient. On the other hand, if the proportion is too large, sufficient elasticity and bass effect cannot be obtained, which is not preferable.

  In addition, in the elastic pavement material of the present invention, the organic silane is added in an amount of 0.1 to 10% by volume with respect to the urethane binder, thereby increasing the bonding strength between the urethane binder and the aggregate, thereby improving the strength and durability. Improvements can be made. As such an organic silane, an epoxy silane, mercapto silane or the like can be used.

  Furthermore, the elastic pavement material of the present invention may contain a urethane binder curing accelerator and other additives such as an antioxidant and an ultraviolet absorber.

  The elastic pavement material of the present invention can be obtained by mixing a urethane binder and an additive that is added as necessary to a mixture of aggregate, rubber chip and / or rubber powder. The mixing method in this case is not particularly limited, and any method that can uniformly mix these may be used. The temperature at the time of addition and mixing of the urethane binder to the aggregate may be normal temperature, but curing is delayed at a low temperature, and curing is accelerated at a high temperature. Therefore, it is preferable to adjust the temperature as necessary.

  Such an elastic pavement material is usually applied to a thickness of about 10 to 50 mm so that voids with a porosity of about 10 to 40% are formed and cured.

Hereinafter, the present invention will be described in more detail with reference to examples.
As shown in FIG. 1A, a 30 cm × 30 cm × 5 cm semi-flexible pavement 10 was prepared, and a mold 1 having a diameter of 10 cm and a height of 3 cm was installed thereon. Then, rubber powder, aggregate and binder were mixed and kneaded according to the formulation shown in Table 1 below to prepare elastic pavement materials for each comparative example and example.

  Each elastic pavement material was put into the mold 1, rolled, and allowed to stand at room temperature for 1 week, and then a jig 2 was attached as shown in FIG. In addition, if adhesive force is 0.7 Mpa or more, it is favorable practically without a problem.

＊１）ゴム粉：骨材比＝７５：２５
＊２）粒径２〜５ｍｍ
＊３）混合珪砂
＊４）ウレタンプレポリマー ＲＢ−０８，日本ポリウレタン工業（株）製（粘度２７００〜３０００ｍＰａ・ｓ）

* 1) Rubber powder: aggregate ratio = 75:25
* 2) Particle size 2-5mm
* 3) Mixed silica sand * 4) Urethane prepolymer RB-08, manufactured by Nippon Polyurethane Industry Co., Ltd. (viscosity 2700-3000 mPa · s)

  As can be seen from the results in Table 1 above, in the elastic pavement material of the example in which the ratio of the urethane binder is in the range of 25 to 35% by volume, even if no primer is used, it is between the base semi-flexible pavement. It was confirmed that good adhesion could be secured.

(A), (b) is explanatory drawing which shows the outline | summary of the adhesion test in an Example.

Explanation of symbols

1 Mold 2 Jig 10 Semi-flexible pavement

Claims (2)

  An elastic pavement material containing a rubber chip and / or rubber powder, an aggregate, and a urethane binder, and constructed on a base without a primer, and containing 25 to 35% by volume of the urethane binder. Elastic paving material characterized by.   The elastic pavement material according to claim 1, comprising 45 to 65% by volume of the rubber chip and / or rubber powder and 10 to 30% by volume of the aggregate.

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