JP2001139732A - Pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pavement capable of attaining remarkable enhancement of mechanical strengths such as a tensile strength, tear strength and the like of the pavement together with intergranular adhesiveness and excellent in practical properties such as noise reduction of vehicular traffics, abrasion resistance, water resistance, solvent resistance, durability and the like. SOLUTION: This pavement is provided by curing a paving material comprising rubber-based granules and a polyurethane-based binder on a base or adhering a cured paving material on the base. The rubber-based granules are obtained by activating the surface of the rubber-based granules and treating them with an acidic reaction retarder corresponding to isocyanate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement on a highway, a general road, a sidewalk, a park, a sports facility, a schoolyard, and the like, and more particularly, to water resistance, solvent resistance, durability, abrasion resistance, and mechanical properties. The present invention relates to an elastic pavement having excellent mechanical strength and the like.

[0002]

2. Description of the Related Art Conventionally, when a rubber-based pulverized material, particularly a pulverized material such as a hard-to-adhere SBR or a natural tire mainly composed of natural rubber, or a rubber scrap, is bonded with a polyurethane-based binder or an epoxy resin binder, these materials are previously determined. It is known to knead the pulverized product with a solvent such as toluene, xylene, normal hexane, or a polypropylene polyol.Also, an aromatic polyamine, a polyol, a catalyst, a pigment, a weather stabilizer, and a weather stabilizer are required. The pre-treatment agent with stirring and mixing agents is kneaded and coated on rubber-based pulverized material,
Next, a method is known in which a pavement material obtained by stirring and mixing this and a polyurethane-based binder is spread in a sheet shape on a substrate treated with a primer and cured (Japanese Patent Laid-Open No. 8-413).
No. 14, the surface of rubber-based particles is treated with an activating gas such as chlorine or oxygen, or the surface of the particles is activated by corona discharge treatment, and then the particles are activated with a polyurethane-based binder, an epoxy binder, or the like. Methods of joining are known. In other words, in all of these conventionally known techniques, the surface of the rubber-based pulverized material or particle is roughened by pre-treating the surface of the rubber-based pulverized material or particle before bonding and curing the rubber-based pulverized material or particle with a polyurethane-based binder, an epoxy binder or the like. This is a technique for improving the adhesive strength by making the surface or activating the surface.

[0003]

However, in the pretreatment method using the above-mentioned solvent, polypropylene polyol or the like, the removal of the ultrafine powder and moisture on the surface of the rubber-based pulverized product is not sufficient, so that the pavement for vehicle traffic is insufficient. Are insufficient in practical strength, that is, adhesive strength, strength, elastic elongation, etc., that can withstand running of a vehicle on a road. Also, JP-A-8-41314
In the technology described in the publication, the surface treatment of the rubber-based pulverized product is insufficient, especially moisture remains, and the surface activation is poor, so that it can be used under severe conditions as a pavement for vehicle traffic. It is difficult to obtain physical properties such as strength. Furthermore, in the method of activating the surface of rubber-based particles with chlorine, oxygen, or the like, the bonding force between the rubber-based particles and the polyurethane-based binder is significantly improved by removing dust on the particle surface and removing moisture.
When oxygen is used as a gas for surface activation, there is a high risk of spontaneous ignition of rubber-based particles and the like. In addition, if a chlorine / oxygen mixed gas is used for the surface activation, the activation of the particle surface can be sufficiently achieved. However, in the surface treatment with this mixed gas,
During storage of the treated particles, moisture is absorbed and the adhesive strength tends to vary. This tendency is remarkable especially in a humid environment such as Japan. Also, the activation of the particle surface by corona discharge improves the adhesive force between the particles and the polyurethane-based binder or the like. However, when the pavement for vehicle traffic is constructed on site, the adhesive force varies due to moisture absorption. For example, even if a pavement is produced in a factory where humidity is controlled in advance, and the pavement is attached and constructed on site, it is difficult to obtain a sufficient adhesive strength to a base without variation.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above problems and to improve the bonding force between the rubber-based powdery material and the polyurethane-based binder without variation. By activating the surface of the granular material and then treating it with an acidic type reaction retarder for isocyanate, bonding, mechanical strength of the cured product, elongation, abrasion resistance, adhesion between the granular material, water resistance It has been found that the solvent resistance, durability and the like can be greatly improved, and the present invention has been completed.

That is, the present invention relates to a pavement obtained by curing a pavement material containing a rubber-based powder and a one- or two-part curable polyurethane-based binder on a substrate, The body activates the surface of the rubber-based powder and granular material,
Next, the pavement is a rubber-based granular material treated with an acidic type reaction retarder for isocyanate.

[0006] The present invention also relates to a pavement obtained by bonding a cast and cured product of a pavement material containing a rubber-based powdery granular material and a one- or two-component curable polyurethane-based binder on a base. The above-mentioned pavement, wherein the rubber-based granular material is a rubber-based granular material obtained by activating the surface of a rubber-based granular material and then treating the surface with an acidic type reaction retarder for isocyanate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The rubber-based powder used in the pavement material of the present invention includes all kinds of rubber-based powders, granules, molded powders, and granules. Is preferred. Particularly, from the viewpoint of economy, particles and chips obtained by crushing and refining the collected used tires of automobiles are most suitable. When using recovered tires, it is necessary to remove dust and dirt before grinding. The rubber-based granular material has a particle size of 0.5 depending on the purpose of improving various physical properties.
mm-10mm, further 0.8mm-8mm, especially 0.8mm
It is preferable to use it classified into mm-3.5 mm and 3.5-7 mm. In particular, in the case of a pavement that emphasizes water permeability without giving much importance to strength, the particle size is 1-10.
A mixture of particles of mm and particles of different shapes may be used. These particle diameters are selected according to the base material of the particles and the application thereof.
It is preferable to keep the physical properties of the pavement road surface uniform by aligning the particles to -3 mm and 3-6 mm in particle size, respectively.

[0008] In the activation treatment of the surface of the rubber-based granular material in the present invention, the surface of the rubber-based granular material is oxidized to oxidize the polar group (>
(CO, -COOH, -OH) to obtain a strong bonding force with the polyurethane-based binder. Specifically, it is preferable to treat the surface of the rubber-based powdery granular material with a gas containing chlorine gas or to activate the surface by corona discharge treatment. As a gas containing this chlorine gas,
Specifically, a chlorine (single) gas, a mixed gas of chlorine and oxygen, a mixed gas of chlorine and air, and a mixed gas of chlorine and an inert gas such as nitrogen can be preferably exemplified. In the case of a mixed gas, chlorine is added at 50 to 90 Vol. % Is preferable. Since a strong bonding force with the polyurethane-based binder cannot be obtained simply by the moisture adhering to the particle surface, it is preferable that all of these gases have a moisture content of 0.05% or less. It is preferable to use a dry gas having a dew point of -40 ° C. These gases in the present invention have an advantage that the rubber-based powdery material has no risk of spontaneous ignition as compared with the case where only oxygen gas is used. When the particle surface is treated only with chlorine gas, the chlorine gas adheres to the surface of the particles. Therefore, it is preferable to remove the chlorine gas by post-treatment with dry air or dry nitrogen having a dew point of -40 ° C. The rubber-based powdery material which has been surface-activated in a gas containing chlorine gas (for example, for 3 to 60 minutes) is further subjected to a surface treatment at a construction site with an acid-type reaction retarder for isocyanate. May be stored in a moisture-proof container and taken out before use. Activation of the surface of the granular material by corona discharge treatment can be performed by a known method such as passing a rubber-based granular material in a high-voltage electric field (Polyurethane Resin Handbook P448-45 edited by Keiji Iwata).
1, see Nikkan Kogyo Shimbun).

The acid-type reaction retarder for isocyanate in the present invention is specifically exemplified by phosphoric acid, paratoluenesulfonic acid, methyl paratoluenesulfonate,
Examples thereof include ethyl paratoluenesulfonate, sulfamic acid, sulfanilic acid, benzoyl chloride, and benzoic acid. The amount used is preferably 0.3 to 7% by mass, more preferably 0.5 to 5% by mass, and particularly preferably 0.6 to 3% by mass, based on the polyurethane binder. If the amount is less than 0.3% by mass, the effect of use is low and insufficient. If the amount exceeds 7% by mass, not only the reaction with the polyurethane-based binder becomes extremely slow, but also the adhesive force between the particle surface and the binder decreases. , And variations easily occur. These compounds are used to process rubber-based powdery granules at room temperature. If the amount is small, it is preferable to dilute with a polyether, a plasticizer, or the like, and to uniformly treat the particle surface.

The polyurethane-based binder in the present invention may be either one having a terminal isocyanate group which is cured by moisture in one liquid, or a two-part type which is cured by using an organic polyisocyanate and an active hydrogen compound in combination. However, a one-component moisture-curable polyurethane-based binder that cures at room temperature is preferable because of easy handling. The one-component moisture-curable polyurethane-based binder in the present invention is obtained by reacting an organic polyisocyanate and an active hydrogen compound with an excess of isocyanate groups relative to active hydrogen groups. As the organic polyisocyanate, specifically, 2,4-tolylene diisocyanate, 2,6
-Aromatic diisocyanates such as tolylene diisocyanate, xylene-1,4-diisocyanate, 4,4'-diphenylmethane diisocyanate, crude diphenylmethane diisocyanate including diphenylmethane diisocyanate and polyphenylmethane polyisocyanate, and tetramethylene diisocyanate, hexamethylene diisocyanate, etc. An aliphatic diisocyanate,
Isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, diisocyanates such as alicyclic diisocyanates such as tetramethylxylene diisocyanate, and polymers or modified polyisocyanates of these diisocyanates are suitable. Two or more kinds can be used as a mixture. The active hydrogen compound contains an active hydrogen (group) in the molecule, and preferably has a (number average) molecular weight of 18 to 20,000. In particular,
It is preferable to use one or more of a polyol, a polyamine containing an amino group or the like, a urea resin, a melamine resin, an epoxy resin, a polyester resin, an acrylic resin, and polyvinyl alcohol. Among them, a polyol is particularly preferable. Examples of the polyol include polyester polyols, polyester amide polyols, polyether polyols, polyether / ester polyols, polycarbonate polyols, hydroxyl-terminated liquid polybutadiene, and the like. Of these, polyether polyols are preferable in terms of physical properties. As polyester polyols and polyesteramide polyols, for example, succinic acid, adipic acid,
Terephthalic acid, dicarboxylic acids such as isophthalic acid, their acid esters, acid anhydrides and the like, ethylene glycol,
1,2-propylene glycol, 1,4-butylene glycol, 1,5-pentane glycol, 1,6-hexane glycol, 3-methyl-1,5-pentane glycol, neopentyl glycol, trimethylolpropane, glycerin, quadrol Alternatively, a dehydration condensation reaction with glycol such as ethylene oxide or propylene oxide adduct of bisphenol A, diamine such as hexamethylene diamine, xylene diamine, monoethanolamine, isopropanol triamine, triamine or amino alcohol alone, or a mixture thereof. Obtained ones are listed. Further, lactone-based polyester polyols obtained by ring-opening polymerization of cyclic ester (ie, lactone) monomers such as ε-caprolactone and δ-valerolactone are exemplified.
Examples of the polyether polyol include polyethylene glycol, polypropylene ether polyol (such as polypropylene glycol), and polytetramethylene ether polyol. Examples of the polyether / ester polyol include those produced from the above polyether polyol and the above dicarboxylic acid or acid anhydride. Examples of the polycarbonate polyol include those obtained from the reaction of hexane glycol, 1,4-cyclohexane dimethanol or the like with diethyl carbonate, diphenyl carbonate or the like. Examples of the hydroxyl-terminated liquid polybutadiene include Polybd R45HT and R1 manufactured by Idemitsu Petrochemical Co., Ltd.
5HT. Further, monomolecular diols, triols, and the like listed as the raw materials of the polyester polyol can also be suitably used as the polyol. Examples of the polyamine containing an amino group or the like include monomolecular diamines, triamines, aromatic diamines, and polyether polyamines in which the terminal of a polyether is an amino group. In addition, urea resin, melamine resin, epoxy resin, polyester resin, acrylic resin, polyvinyl alcohol, polysiloxane containing molecular terminal -OH or -COOH, polyethylene oxide, copolymer of polypropylene oxide, and the like have active hydrogen (group). If contained, it can be used as all or part of the active hydrogen compound. The one-component moisture-curable polyurethane-based binder can be synthesized by either the one-shot method or the two-shot method, and in that case, a known urethanization catalyst such as an organic metal compound, an organic amine or a salt thereof can also be used. The organic polyisocyanate and the active hydrogen compound have an isocyanate group / active hydrogen group equivalent ratio of 1.5 to 20, especially 3.0 to 1
The reaction is preferably performed at 0.0. The isocyanate group-terminated prepolymer (one-pack moisture-curable polyurethane-based binder) thus obtained preferably has an isocyanate group content of 1.5 to 25.0% by mass, more preferably 3.0 to 25.0% by mass.
10.0% by mass is preferred. If the isocyanate group content is less than 1.5% by mass, the molecular weight becomes too large, the viscosity increases and the workability decreases, and sufficient adhesiveness cannot be obtained due to a small number of crosslinking points. When the isocyanate group content exceeds 25.0% by mass, the molecular weight after curing is too small, and it becomes difficult to develop mechanical strength. The two-component curable polyurethane-based binder in the present invention comprises two components of the organic polyisocyanate and the active hydrogen compound. In the present invention, the compounding amount of the polyurethane-based binder depends on the type of the material of the rubber-based granular material,
The shape of the particles, the physical properties of the target pavement, the construction method, determined by taking into account the molding method, etc., 3-50 parts by mass, and 5-40 parts by mass with respect to 100 parts by mass of the rubber-based powder and granular material Preferably, there is. The amount of the polyurethane binder is 3
If the amount is less than 50 parts by mass, the adhesive strength tends to be insufficient.
In addition, the foaming phenomenon occurs during curing, and the appearance is likely to be impaired.

In the present invention, additives such as a urethanizing catalyst, a coloring agent, a coupling agent, a tackifier, a filler, a thixotropic agent, and a stabilizer are added to the polyurethane binder according to the purpose. be able to. As the urethanization catalyst, for example, organic lead compounds such as lead octoate and lead naphthoate, and organic tin compounds such as dibutyltin dilaurate and stannas octoate are preferable. The compounding amount is 0.01 to 100 parts by mass of the rubber-based powdery granular material.
It is preferably 1.0 part by mass. The addition of the urethanizing catalyst facilitates the wet curing, and the synergistic effect with the reaction retarder provides a strong bond with the activated terminal active groups on the particle surface. When a pavement or the like is constructed on site, the urethane-forming catalyst is preferably blended immediately before use in order to prevent gelation of the polyurethane-based binder. On the other hand, curing can be promoted by heating using a roller or a finisher, but by adding a urethane-forming catalyst, curing can be promoted irrespective of the applied thickness. As the colorant, for example, chromium oxide, red iron oxide, inorganic pigments such as carbon black,
Known pigments prepared for polyurethane (which does not react with the polyurethane binder) of organic pigments such as phthalocyanine blue and azo pigment can be used. The compounding amount is 0.1% with respect to the total amount of the polyurethane binder.
It is preferably -10% by mass. The coloring agent must be added with care in absorbing water, and colored in a waterproof atmosphere. The coupling agent is used for improving the adhesion of the particles, and examples thereof include a silane coupling agent and a titanium coupling agent. The tackifier is added for the purpose of imparting initial tack when the viscosity of the polyurethane binder is low. Specific examples include terpene resins, phenol resins, terpene phenol resins, rosin resins, xylene resins, melamine resins, and the like. Although the initial tackiness of the binder can be adjusted by adding these resins, the final adhesive strength is reduced, so that the binder may be used according to the purpose. The filler is used to increase the amount of the pavement material and to control shrinkage and expansion during the curing thereof and to reinforce the cured product.Specifically, calcium carbonate, clay, titanium oxide, carbon black, Barium sulfate and the like. Examples of the far-changing agent include aerosil and disparone, which are added and blended to adjust the viscosity of the polyurethane binder. The stabilizer includes a weather resistance stabilizer, an ultraviolet absorber, an antioxidant, a heat resistance stabilizer, a hydrolysis inhibitor and the like. Specific examples of the weather resistance stabilizer include nickel dithiocarbamates of Nocrack NBC (Ouchi Shinko), no-block amines such as Nocrack # 300, Nocrack NS-6 (Ouchi Shinko), Tinuvin 144 (Chiba Geigy), and Irga. Knox 1
Positionally hindered phenols such as 010, 1076 (Ciba-Geigy), benzotriazoles such as Tinuvin P-327, 328 (Ciba-Geigy), benzophenones such as Tomisorp 800 (Yoshitomi Pharmaceutical), Sanol LS-744, 770 (Sankyo), etc. Can be mentioned.

These additives, except for the urethanization catalyst, can also be used in the form of an acid type reaction retarder for isocyanate. Further, after activating the surface of the rubber-based powder or granular material, before the treatment with the reaction retarder, it may be treated with an additive or a solution containing the additive,
After activating the surface of the rubber-based granular material and then treating it with a reaction retarder, it may be treated with an additive or a solution containing an additive. preferable. Note that coloring is preferably performed after a surface activation treatment using a gas containing chlorine gas.

In the present invention, the pavement may be cured by laying the pavement material in a sheet shape on a base and curing the pavement material in a mold such as a mold or a wooden mold. A cured product of the mold may be adhered on a substrate. Specifically, for example, the sheet can be formed by blending a rubber-based powder and a polyurethane-based binder and the like, pouring the mixture into a wooden frame having a thickness of 10 mm, and pressing the upper portion with a hot iron or the like.

As a base on which the pavement is constructed, asphalt concrete, concrete, mortar-like base, polymer cement layer and the like are used.
Asphalt concrete with good adhesion to rubber-based paving materials is optimal. Further, in order to further improve the adhesiveness with the rubber-based pavement material, it is preferable to perform a primer treatment on the surface of the base. As such a primer, a one-component moisture-curable polyurethane-based primer is most suitable. In this case, when a solvent is used in combination with the primer, it is necessary to use a solvent that does not attack asphalt, concrete, and the like.

[0015]

The present invention will be described in more detail with reference to the following examples. In Production Examples, Examples and Comparative Examples, “%” means “% by mass” unless otherwise specified. Production Example 1 (Production of polyurethane binder) 350 g of diphenylmethane diisocyanate (pure product, manufactured by Sumitomo Bayer Urethane) and number average molecular weight of 2,000
250 g of polypropylene glycol (made by Asahi Denka Kogyo)
And 400 g of polypropylene glycol having a number average molecular weight of 3000 (manufactured by Takeda Pharmaceutical Co., Ltd.) are uniformly mixed, and reacted at 70 ° C. for 2 hours in a nitrogen stream to obtain a terminal isocyanate group content of 9.5% and a viscosity of 3,500 mPa · s / 25. C (one-part moisture-curable) polyurethane was produced. Production Example 2 (1) Preparation of Additive-Containing Acidic Reaction Retarder Solution (1) For 16 g of polyether polyol, 2 g of phosphoric acid, 10100.6 g of Irganox, and Tinuvin 328 0.6
The mixture was mixed at a rate of g in a nitrogen stream at room temperature while preventing water absorption to prepare an acidic reaction retarder solution (1) containing an additive. (2) Preparation of Additive-Containing Acidic Reaction Retarder Solution (2) To 19.2 g of the additive-containing acidic reaction retarder solution (1), 9.6 g of bengara (for urethane), 0.53 g of lead octoate, The mixture was mixed at a rate of 0.64 g of Nocrack NBC in a nitrogen stream at room temperature while preventing water absorption to prepare an acidic reaction retarder solution (2) containing an additive.

Example 1 A rubber chip # 800H obtained by crushing and collecting a collected used tire.
(Particle size 1-3 mm, manufactured by Misawa Toyo) 900 g of chlorine gas 80 Vol. %, Oxygen gas 20Vol. % In a mixed gas stream and stored in a waterproof container. Next, the surface-activated rubber chip is treated with 20 g of the acid-containing reaction retarder solution (1) containing the additive obtained in Production Example 2, and then mixed with 205 g of the one-component moisture-curable polyurethane binder obtained in Production Example 1 to obtain a wood chip. Poured into a frame, averaged thickness, cured at room temperature and cured for another week. A test piece was prepared by punching out the cured product with a dumbbell No. 1 of JIS K-6251 so that N = 5. Example 2 Rubber chip # 1540 obtained by crushing and collecting recovered old tires
Same as Example 1 except that -C (particle size: 3-6 mm, manufactured by Muraoka Rubber Co., Ltd.) was used, and that benzoyl chloride was used instead of phosphoric acid in the additive-containing acidic reaction retarder solution (1). I went. Example 3 900 g of a rubber chip # 800H was supplied with chlorine gas 60 Vo
l. %, Oxygen gas 40 Vol. % In the same manner as in Example 1 except that the surface-activated treatment with the mixed gas of 10% and the one contained in the waterproof container were treated with 30 g of the acidic reaction retarder solution (2) containing the additive obtained in Production Example 2. I went.

Comparative Example 1 205 g of the one-component moisture-curable polyurethane binder obtained in Production Example 1 was mixed with 900 g of rubber chip # 800H and poured into a wooden frame, the thickness was averaged, and cured at room temperature.
Cured for another week. A test piece was prepared by punching out the cured product with a dumbbell No. 1 of JIS K-6251 so that N = 5. Comparative Example 2 Comparative Example 1 except that rubber tip # 1540-C was used.
Was performed in the same manner as described above. Comparative Example 3 900 g of a rubber chip # 800H was subjected to a number average molecular weight of 200.
20 g of polypropylene glycol at room temperature, RH60
%, Then add and mix 205 g of the one-part moisture-curable polyurethane binder obtained in Production Example 1, pour into a wooden frame, average the thickness, cure at room temperature, and further cure. Cured for one week. A test piece was prepared by punching out the cured product with a dumbbell No. 1 of JIS K-6251 so that N = 5. Comparative Example 4 900 g of rubber chip # 1540-C was applied to 20 V of chlorine gas.
ol. %, Oxygen gas 80Vol. % Of the mixture, and 205 g of the one-component moisture-curable polyurethane binder obtained in Production Example 1 was added thereto, mixed and poured into a wooden frame. The thickness was averaged, and the mixture was cured at room temperature. And cured for another week. A test piece was prepared by punching out the cured product with a dumbbell No. 1 of JIS K-6251 so that N = 5. Comparative Example 5 900 g of a rubber chip # 800H was placed in a nitrogen gas stream for 5 minutes.
Surface treatment for minutes. Then, the surface (activated) -treated rubber chip is treated with 20 g of the additive-containing acidic reaction retarder solution (1) obtained in Production Example 2, and then mixed with 45 g of the one-pack moisture-curable polyurethane binder obtained in Production Example 1. Then, the mixture was poured into a wooden frame, the thickness was averaged, cured at room temperature, and further cured for one week. According to JIS, the cured product should be N = 5.
A test piece was punched out with a dumbbell No. 1 of K-6251. Comparative Example 6 900 g of a rubber chip # 800H was treated with 20 g of the acidic reaction retarder solution (1) containing the additive obtained in Production Example 2, and then 205 g of the one-part moisture-curable polyurethane binder obtained in Production Example 1 was added thereto. Mix, pour into wooden crate,
The thickness was averaged, cured at room temperature, and cured for an additional week. This cured product is JIS K-62 so that N = 5.
A test piece was prepared by punching out with a No. 51 dumbbell No. 1.

Example 4 The procedure of Example 3 was repeated except that the amount of the phosphoric acid in the additive-containing acidic reaction retarder solution (1) was changed to 3 g. Example 5 In Example 3, 2 g of phosphoric acid of the acidic-type reaction retarder solution (1) containing an additive was replaced with methyl paratoluenesulfonate 3
The procedure was performed in the same manner except that g was changed. Example 6 In Example 3, the phosphoric acid of the additive-containing acidic reaction retarder solution (1) was changed to benzoyl chloride.
The same procedure was performed except that the amount of the one-component moisture-curable polyurethane binder obtained in the above was changed to 300 g. Example 7 102.5 g of polypropylene glycol having a number average molecular weight of 2,000 (manufactured by Asahi Denka Kogyo) and 102.5 g of isocyanate prepolymer MC-50 (manufactured by Idemitsu Petrochemical) were mixed and stirred immediately before the construction work (two-component curing type). ) The procedure was performed in the same manner as in Example 1 except that 205 g of the polyurethane binder was used. Example 8 A 15% solution obtained by diluting the one-pack moisture-curable polyurethane binder obtained in Production Example 1 with a mixed solvent of toluene / xylene / MEK = 1/1/1 was used as a primer (paving for a sidewalk).
Except for spraying on the substrate, the same procedure as in Example 1
mm pavement was constructed. One month after the construction, no blistering or peeling was observed. Example 9 Chlorine gas 60 Vol. %, Air 40 Vol. %, Except that the surface activation treatment was performed with a mixed gas of 10%. Example 10 Example 1 except that the surface activation treatment was performed by corona discharge.
Was performed in the same manner as described above. Tables 1, 2 and 3 collectively show the amounts of raw materials used, the measurement results of the performance of the test pieces, and the like of these Examples and Comparative Examples.

[Performance Test] Tensile strength, elongation and tear strength of pavement According to JIS K-6301, the test piece has a thickness of 10 mm.
Is punched out using a dumbbell JIS K-62511, and a test piece for tear strength is a JIS tear (B) type. The measurement is performed at room temperature 25 ° C ± 1 ° C and 50% RH. The speed was 10 mm / min, and the tearing speed was 500 mm / min. 2. Adhesion between particles Evaluated by bending test of pavement. The test piece is 210
(Length) x 50 (width) x 15 (thickness) mm was bent in two in the length direction, and both ends were fixed with gum tape. 25
The time required from the start of bending to breaking at a temperature of 1 ° C. ± 1 ° C. was measured.

[0020]

[Table 1]

[0021]

[Table 2]

[0022]

[Table 3]

[0023]

As described above, in the present invention, a vulcanized rubber, particularly a rubber-based powdery material such as an old recovered tire which could not be used as an elastic pavement due to insufficient adhesiveness, was used. By performing surface activation treatment of rubber-based powders and granules, followed by treatment with an acid type reaction retarder for isocyanate, the mechanical strength and elongation of the pavement, such as tensile strength and tear strength, are greatly improved, and the particles are improved. Adhesiveness between vehicles can be significantly improved, and practicality such as abrasion resistance, water resistance, solvent resistance, durability, etc. in general roads, parks, schoolyards, sports facilities, etc., including noise suppression on vehicle traffic roads It is possible to provide for the first time a pavement excellent in quality, and the present invention also contributes to recycling of used tires and the like.

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Claims (7)

[Claims] 1. A pavement obtained by curing a pavement material containing a rubber-based powder and a one-pack or two-pack-curable polyurethane-based binder on a base, wherein the rubber-based powder is a rubber The above-mentioned pavement, wherein the surface is a rubber-based powder or granular material obtained by activating the surface of the powder-based granular material, and then treating it with an acid-type reaction retarder for isocyanate. 2. A pavement obtained by bonding a cast cured product of a pavement material containing a rubber-based powder granule and a one- or two-component curable polyurethane-based binder onto a base, wherein the rubber-based powder is The above-mentioned pavement, wherein the granular material is a rubber-based granular material obtained by activating the surface of a rubber-based granular material and then treating it with an acid-type reaction retarder for isocyanate. 3. The pavement according to claim 1, wherein the pavement is a pavement containing a rubber-based granular material, a one- or two-component curable polyurethane-based binder, and an additive. 4. The rubber-based powder or granule obtained by activating the surface of the rubber-based powder or granule, and then treating with a mixture of an acid-type reaction retarder for isocyanate and an additive, or The rubber-based granular material surface contains an additive or an additive before the surface is activated and then treated with an acidic type reaction retarder for isocyanate and / or after the acidic type reaction retarder for isocyanate. 4. A rubber-based granular material treated with a solution.
A pavement according to any one of the preceding claims. 5. The pavement according to claim 1, wherein the base is a base whose surface is treated with a primer. 6. The method according to claim 1, wherein the activation treatment of the surface of the rubber-based granular material is an activation treatment of the surface of the rubber-based granular material by a gas containing chlorine gas or corona discharge. The pavement according to the above. 7. The acid type reaction retarder for isocyanate is selected from the group consisting of phosphoric acid, paratoluenesulfonic acid, methyl paratoluenesulfonate, ethyl paratoluenesulfonate, sulfamic acid, sulfanilic acid, benzoyl chloride, and benzoic acid. The pavement according to any one of claims 1 to 6, which is one or more selected compounds.