JPH073146A - Moisture-curable elastic paving material and application of the same to surface of elastic pavement - Google Patents

Abstract

PURPOSE:To provide the material having an unlimited pot life, providing a good surface finish, and excellent in slip and wear resistances and apply the same onto the surface of an elastic pavement. CONSTITUTION:An elastic paving material prepared by mixing 100 pts.wt. one- pack curable resin composition comprising an urethane prepolymer having at least two isocyanate groups at the terminals and a blocked amine compound being substantially unreactive with isocyanate groups and forming prim. or sec. amino groups with 10-300 pts.wt. particulate rubber chips 2a of a mean particle diameter of 0.1-10mm is sprayed by means of pneumatic pressure onto an elastic paving material layer 4 to form a rugged area 4a having round protrusions 3a containing particulate rubber chips on the surface, and this area 4a is cured into a surface layer 5a by allowing it to stand in air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-curable elastic pavement material and a method for constructing an elastic pavement surface using the elastic pavement material, and more particularly to an athletic field, athletic field, tennis court, volleyball court, basketball court, handball court. The present invention relates to a moisture-curable elastic pavement material suitable for forming a surface layer such as a badminton coat, a jogging track, and a golf course cart road, and a method for constructing an elastic pavement surface.

[0002]

2. Description of the Related Art Conventionally, in an athletic field, athletic field, etc., non-slip (slip resistance) and wear resistance are imparted, a feeling of movement is improved, and knee fatigue is reduced. It is common practice to make the pavement surface anti-slip to prevent it.

For example, Japanese Patent Laid-Open No. 3-96504 (invention relating to "finishing method for elastic pavement surface") discloses an elastic pavement obtained by curing a two-component curing type polyurethane with a predetermined amount of granular rubber chips for the above means. It is designed to spray onto the surface of a material layer. Japanese Patent Publication No. 61-37402 (invention related to "paving method for stadiums using all-weather spikes") is a two-component curing type polyurethane on a cured elastic paving material layer. The pavement material is poured, polyurethane chips are sprayed until the liquid hardens, and the pavement material is coated on the chip.

However, the two-part curing type polyurethane is composed of a two-part composition of a polyurethane prepolymer having two or more free isocyanate groups and a curing agent containing an aromatic diamine as a main component. As it progresses, the pot life is limited. Especially in summer, the temperature rises and the pot life is shortened. If it is not used immediately, it will thicken and become unusable. In addition, since the viscosity of the mixed liquid is different immediately after mixing and after standing, the atomized state at the time of spraying is different, and the finished state of the adherend surface is different. For this reason, although it is possible to add a thinner to extend the pot life, the thinner cannot be used because it has a problem of safety against fire and human body, and further, the cured resin has a drawback that the cured resin becomes lean over time.

Japanese Patent Publication No. 2-31165 (invention relating to "color elastic pavement") discloses a method in which a one-component curing type polyurethane having a terminal isocyanate group and a rubber chip are mixed and used. The one disclosed in the same publication uses a one-component curing type polyurethane as an adhesive for a rubber chip and is constructed by applying pressure on a roll of asphalt with a roll. It becomes difficult to increase resistance. When the compounding amount of the one-component curable polyurethane having a terminal isocyanate group is increased in order to make it difficult to release the rubber, the carbon dioxide gas generated causes foaming and a predetermined strength cannot be obtained.

The present invention has been made in view of the above problems of the prior art, and the object thereof is not to limit the pot life, the finished condition of the surface is good, and the slip resistance and An object of the present invention is to provide an elastic pavement material having excellent wear resistance and a method for constructing an elastic pavement surface using the elastic pavement material.

[0007]

In order to achieve the above object, the present invention is directed to a urethane prepolymer having two or more isocyanate groups at its terminals and a primary or The average particle diameter is 0.1 to 1 with respect to 100 parts by weight of a one-pack curable resin composition containing a block amine compound that generates a secondary amino group.
The first invention is a moisture-curable elastic pavement material characterized by containing 10 to 300 parts by weight of 0 mm granular rubber chips, and the elastic pavement material of the first invention is blown onto a base by air pressure, A second invention is a method of constructing an elastic pavement surface, which is characterized in that an uneven portion having rounded protrusions having a built-in granular rubber chip is formed on the surface and the uneven portion is allowed to harden by being left to stand.

The urethane prepolymer having two or more isocyanate groups at the terminals (hereinafter referred to as "urethane prepolymer") used in the present invention is a monool and polymethylene polyphenyl isocyanate described below (hereinafter referred to as "C-
MDI "), a reaction product of a polyol and an organic polyisocyanate, and the like.

Examples of monools include methanol,
The monool etc. which were obtained by adding ethylene oxide and propylene oxide to ethanol and butanol can be mentioned.

Examples of the polyol include mono-di- and tri-propylene glycol, mono-di- and triethylene glycol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, castor oil,
Castor oil polyol, polybutadiene containing 2-3 terminal hydroxyl groups, mono-di- and triethanolamine,
Aniline, polytetramethylene glycol, bisphenol A, hydroquinone, etc. alone or in a mixture, or a polyol obtained by addition-polymerizing alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, styrene oxide, etc., and ethylene glycol, propylene Examples thereof include polyester polyols obtained by condensing polyhydric alcohols such as glycol, diethylene glycol and trimethylolpropane with polybasic acids such as malonic acid, succinic acid, adipic acid and phthalic acid.

As the organic polyisocyanate, for example, 2,4- / 2,6-80 / 20- and 65/35.
-Tolylene diisocyanate (hereinafter referred to as "TDI"), diphenylmethane diisocyanate (hereinafter referred to as "MD
I ”), C-MDI, naphthalene diisocyanate, xylylene diisocyanate (hereinafter referred to as“ XDI ”), tetramethylxylylene diisocyanate, hexamethylene diisocyanate, triphenylmethane triisocyanate, hydrogenated TDI, hydrogenated MDI, hydrogenated XDI. , Isophorone diisocyanate, etc., or a mixture thereof, a buret body, an isocyanurate body, or a carbodiimide-modified product.

The NCO / OH equivalent ratio of the organic polyisocyanate to the polyol is 1.5 to 10.0, preferably 2.0 to 5.0. In addition, as the organic polyisocyanate, firstly tolylene diisocyanate was NC.
After reacting with a polyol at an O / OH equivalent ratio of about 1.5 to 3.0, C-MDI or the like is further added and mixed to make the overall NCO / OH equivalent ratio 3.0 to 10.0. Good.

If necessary, an organic inert diluent may be added to the obtained urethane prepolymer in order to improve workability. Examples of the organic inert diluent include toluene, xylene, 1.1.1-trichloroethane, methyl ethyl ketone, dibutyl and dioctyl phthalate, dibasic acid esters such as dimethyl succinate, dimethyl glutamate and dimethyl adipate, ethylene glycol diacetate. , Glycol fatty acid esters such as diethylene glycol diacetate, isoparaffin, chlorinated paraffin, and process oil. The addition amount of these organic inert diluents is such that they are present in the urethane prepolymer in an amount of 1 to 60% by weight, preferably 10 to 30% by weight.

The blocked amine includes, for example, aldimine, ketimine, enamine, oxazolidine, etc., and has, for example, at least one primary or secondary amino group, and a primary or secondary amino group. Group, a compound having active hydrogen such as a hydroxyl group (hereinafter referred to as "compound (A)") with an aldehyde or a ketone, a ketimine alcohol obtained from the compound (A) with an aldehyde or a ketone. 2 oxazolidine in the molecule reacted with organic polyisocyanate
Examples thereof include individual compounds.

Typical compounds (A) are, for example, compounds having a primary amino group and a hydroxyl group, secondary compounds
Compound having primary amino group and hydroxyl group, compound having primary amino group and secondary amino group, compound having primary amino group / secondary amino group and hydroxyl group, two first Examples thereof include compounds having a secondary amino group, compounds having two secondary amino groups, compounds having a secondary amino group and two hydroxyl groups, and specifically, for example, 2- ( 2-aminoethoxy) ethanol, N- (2-aminoethyl) piperazine, ω-
Hydroxyhexylamine, N-methyl-1,6-hexanediamine, diethylenetriamine, N- (2-hydroxyethyl) ethylenediamine, 3-aminoethylpiperidine, N- (2-hydroxyethyl) piperazine,
1-amino-3-aminomethyl-3,5,6-trimethylcyclohexane, N- (methylaminoethyl) piperazine, aniline, toluidine, xylidine, isophoronediamine, diaminocyclohexane, diaminodiphenylmethane, xylylenediamine, diaminobenzene, diamino Methyl norbonane, diaminomethylbicycloheptane, ethanolamine, diethanolamine, dipropanolamine, hexanolamine and the like can be mentioned.

Examples of aldehydes or ketones include formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, trimethylacetaldehyde, valeroaldehyde, acrolein, crotonaldehyde, furfural, benzaldehyde,
Acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, diisobutyl ketone, methyl heptenone, cyclohexanone, isophorone, acetophenone and the like can be mentioned. The reaction of compound (A) with aldehydes or ketones can be carried out under known reaction conditions.

The amount of the block amine added is preferably 1 to 50 parts by weight based on 100 parts by weight of the urethane prepolymer. When the urethane prepolymer and block amine are used in combination, an inorganic filler, a thixotropic agent, a plasticizer, a solvent, an adhesion agent, a colorant, a stabilizer, a leveling agent, a defoaming agent, and an antioxidant are appropriately used. It is also possible to use an ultraviolet absorber or the like together.

As the granular rubber chips, polyurethane,
Ethylene-propylene rubber, ethylene-propylene-diene rubber, chloroprene rubber, nitrile-butadiene rubber, styrene-butadiene rubber, natural rubber and crushed old tires can be used. The average particle size of the rubber is preferably 0.1 to 10 mm, more preferably 1 to 7 mm
Is good. If it is less than 0.1 mm, slip resistance and abrasion resistance are poor, and if it exceeds 10 mm, spike resistance and rubber chip detachment resistance are poor, which is not preferable. The granular rubber chip may be one in which an inorganic filler is kneaded therein, and the amount is 10 parts by weight based on 100 parts by weight of the total weight of the prepolymer and the block amine.
To 300 parts by weight, more preferably 50 to 2
00 parts by weight is preferred. If it is less than 10 parts by weight, the slip resistance is inferior, and if it exceeds 300 parts by weight, the detachment resistance of the rubber chip is inferior, which is not preferable. The shape of the granular rubber chips is square,
It may be circular, hinge-shaped or the like.

The granular rubber chips may be mixed immediately before the construction, or may be mixed when the urethane prepolymer and the block amine compound are mixed in advance. Alternatively, the one-part curable resin composition comprising a urethane prepolymer and block amine and the granular rubber chips may be simultaneously sprayed with a spray gun and coated on the adherend in a mixed state.

By blending such granular rubber chips, thixotropic property is imparted, and the resin composition retains an appropriate fluidity.

The moisture-curable elastic pavement agent of the present invention contains a thixotropic agent, a weather resistance-imparting agent, an antioxidant, an ultraviolet absorber, a coloring pigment, a plasticizer, a diluent, a reaction catalyst, an inorganic filler and the like. can do. As the inorganic filler, calcium carbonate, silica, talc, aluminum hydroxide, sodium sulfate, calcium sulfate, calcium hydroxide, calcium oxide, organic matter treatment (fatty acid treatment, fatty acid ester treatment,
Fatty acid metal salt treatment, rosin acid treatment, silane treatment, acrylic treatment) Calcium carbonate, organic substance-treated talc, organic substance-treated silica, etc. can also be added.

As a method for spraying the moisture-curable elastic pavement material onto the base by air pressure, this elastic pavement material is placed in the vicinity of the injection port of a known spray gun, and the compressed air flow of the spray gun blows it onto the base. By attaching it, it is possible to form a concavo-convex portion having rounded projections having a granular rubber chip built-in on its surface. The foundation may be a soil layer, a concrete layer, an asphalt layer, a quarry stone layer, or
A prepaved elastic layer, for example, a urethane layer or a urethane layer containing rubber chips, urethane chips, expanded polystyrene chips, expanded polyethylene chips, or expanded ethylene-vinyl acetate copolymer chips may be used. It may be an elastic layer constructed with a material. further,
Before spraying the elastic pavement material of the present invention onto a substrate, a urethane primer, an acrylic primer, an epoxy primer, or the like can be previously applied to the substrate.

[0023]

[Function] Block amine is hydrolyzed by moisture in the air or moisture on the surface of granular rubber chips to generate a primary amine or secondary amine, which reacts with the isocyanate group of the urethane prepolymer and is cured. A strong skeleton having rubber elasticity is formed without compounding a curing agent. In this way, since it is not necessary to mix the two liquids, it is easy to handle, and by mixing the granular rubber chips, the unevenness portion having rounded projections is formed on the surface thereof, and the sliding resistance is excellent. Can be finished on elastic pavement surface.

[0024]

EXAMPLES Next, examples of the present invention will be sequentially described. First,
A production example of the one-pack curable resin composition will be described. [Production Example-1 of one-component curable resin composition] 100 parts by weight of lauric acid-treated calcium carbonate, 30 parts by weight of dioctyl phthalate, and red iron oxide 20 in a planetary mixer.
Charge 1 part by weight, knead for 15 minutes at room temperature, then 1
While kneading at 00 ° C., dehydration operation was performed in vacuum for 1 hour.

Next, polyoxypropylene / polyoxyethylene glycol (average molecular weight 2000, oxyethylene chain content 20% by weight) and polyoxypropylene / polyoxyethylene triol (average molecular weight 4000, oxyethylene chain content 20% by weight) were added. Prepolymer I containing a terminal NCO group obtained by reacting this mixture with 2,4 tolylene diisocyanate at an NCO / OH equivalent ratio = 2.1 / 1 by mixing in a weight ratio of 2: 1 (terminal NCO Group content = 3.7% by weight) 100 parts by weight, 11.5 parts by weight of a block amine compound obtained from 2 mol of ketimine alcohol obtained by reacting hexanolamine and cyclohexanone in equimolar amounts and 1 mol of tolylene diisocyanate, And 10 parts by weight of xylene are mixed into the kneaded product in the planetary mixer. Kneaded for a further 15 minutes at room temperature, to obtain a one-component curable resin composition. The viscosity of this resin composition is 8
It was 000 mPa · s / 25 ° C.

[Production Example-2 of One-Component Curing Resin Composition] In Production Example 1, calcium calcium palmitate treated in place of the lauryl acid-treated calcium carbonate is replaced by polyoxypropylene glycol in place of the prepolymer I.
Polyoxyethylene glycol (average molecular weight 2000,
The prepolymer II obtained by reacting an oxyethylene chain content of 10% by weight) with diphenylmethane diisocyanate at an NCO / OH equivalent ratio of 3.0 is a block amine compound 1
Production Example 1 except that 15.3 parts by weight of an enamine compound obtained from 1 mol each of dimer acid tall oil fatty acid, anhydrous piperazine and 1 mol of trimethylcyclohexane was used as a block amine compound instead of 1.5 parts by weight.
A one-pack curable resin composition was obtained under the same conditions as above. The viscosity of this resin composition was 12000 mPa · s / 25 ° C.

[Production Example-3 of one-component curable resin composition] 180 parts by weight of dioctyl phthalate, 200 parts by weight of lauric acid-treated calcium carbonate, 50 parts by weight of red iron oxide, and 0.3 part of carbon are added to a planetary mixer. Department,
After 10 parts by weight of the antioxidant was charged, the mixture was kneaded at room temperature for 10 minutes, and subsequently, the mixture was kneaded at 100 ° C., and dehydration operation was performed for 1 hour under vacuum. Next, polyoxypropylene / polyoxyethylene glycol (average molecular weight 2000, oxyethylene chain content 20% by weight) and polyoxypropylene triol (average molecular weight 3000) were mixed at a weight ratio of 2: 1 and this mixture was prepared. 100 parts by weight of a prepolymer (terminal NCO group content = 2.0% by weight) obtained by reacting 2,4 tolylene diisocyanate with an NCO / OH equivalent ratio = 1.5 / 1, and diaminomethylbicycloheptane 8.0 parts by weight of dialdimine obtained by the equivalent reaction of triethylacetaldehyde as a block amine compound was mixed into the kneaded product in the planetary mixer, and kneaded at room temperature for 15 minutes in vacuum to prepare a one-component curable resin. A composition was obtained. The viscosity of this resin composition is 110
It was 00 mPa · s / 25 ° C.

Next, each of the examples will be described since the elastic pavement surface was constructed by using each one-pack curable resin composition obtained as described above. [Example 1] 100 parts by weight of the one-component curable resin composition of Production Example 1 and red iron oxide rubber chips (average particle size 3 m)
m) 50 parts by weight are uniformly mixed and placed in a container of a mortar gun, and as shown in FIG. 1, on the surface of the elastic pavement material layer 1 preliminarily constructed with the one-component curable resin composition of Production Example 1, The amount of air blown by the high pressure air of the air compressor is 3.5 kg /
It was sprayed so as to be m ² . As a result, the concavo-convex portion 4 having the rounded protrusions 3a containing the granular rubber chips 2a therein is provided.
A surface layer 5a having a thickness of about 3 mm and having a formed thereon was obtained. The surface layer 5a cured after a certain period of time is firmly adhered to the surface of the elastic pavement material layer 1, and there is no detachment (peeling) of the surface chips even when running with spike shoes for athletic stadiums.
The driving feeling was good. Also, there was no skidding.

The "slip resistance coefficient" measured by the Architectural Institute of Japan was 1.2, which was "non-slip (proper value)". The one-component curable resin composition of the present invention does not change the viscosity of the composition immediately after mixing Bengalala-colored urethane rubber chips or after standing for 1 hour after mixing, and also shows the condition of the sprayed surface and the physical properties of the cured product. There was no change.

Example 2 100 parts by weight of the one-pack curable resin composition of Production Example 2 and 35 parts by weight of red iron oxide urethane rubber chips (average particle diameter 1 mm) were uniformly mixed and put in a container for resin gun. As shown in 2, on the surface of the rubber chip adhesive layer 6 obtained by pressing the roller with a ratio of 100 parts by weight of the ethylene / propylene / diene rubber chip having an average particle diameter of 3 mm and 20 parts by weight of the moisture-curable urethane adhesive, The amount of air blown by the high pressure air of the air compressor is 3.5.
It was sprayed so as to be kg / m ² . As a result, a surface layer 5b having a thickness of about 3 mm was obtained in which an uneven portion 4b having a rounded protrusion 3b containing a granular rubber chip 2b was formed.
The surface layer 5b, which has been cured after a certain period of time, is firmly adhered to the surface of the rubber chip adhesive layer 6, and the surface chips are detached (peeled) even when running with spike shoes for an athletic field.
The feeling of running was good. Also, there was no skidding. The above-mentioned "slip resistance coefficient" was 0.9, which corresponds to "not slip (proper value)".

Example 3 100 parts by weight of the one-pack curable resin composition of Production Example 3 and 50 parts by weight of red iron oxide urethane rubber chips (average particle diameter 5 mm) were uniformly mixed, and this mixture was used in Production Example 3. The same method as in Example 1 was applied to the surface of the elastic pavement material layer applied with the one-pack curable resin composition.
As a result, an elastic paving material layer having the same surface layer as in FIG. 1 was obtained. When the cured surface layer was run with spike shoes for athletic stadiums, the surface chips were not detached (peeled) and the running feeling was good. Also, there was no skidding. The above-mentioned "slip resistance coefficient" was 0.9, which corresponds to "not slip (proper value)".

Comparative Example 1 One-component curing type polyurethane having terminal isocyanate groups obtained by reaction of diphenylmethane diisocyanate and polyoxypropylene glycol (average molecular weight 2000) (terminal NCO group content = 8.0% by weight) 25 1 part by weight, 75 parts by weight of ethylene / propylene / diene rubber (average particle diameter 3 mm), and 3.0 parts by weight of red iron oxide are put in a mortar mixer and mixed well, and then 15 kg / m ² on a pre-treated asphalt pavement. It was applied and lightly pressed by a roller to obtain a brick-colored elastic paving material. After being left for one week, when running with spike shoes as in Example 1, the running feeling was good, but there was side slippage. Further, the rubber chips were peeled off after running for a long time. Further, the above "slip resistance coefficient" was 0.5, which corresponds to "easy to slide".

COMPARATIVE EXAMPLE 2 Polyoxypropylene glycol (average molecular weight 2000), polyoxypropylene triol (average molecular weight 3000) and tolylene diisocyanate were reacted to produce a terminal isocyanate prepolymer (terminal NCO group content = 3.0% by weight). ) Got. Also,
Methylenebis orthochloroaniline 3.5 parts by weight, polyoxypropylene glycol (average molecular weight 2000) 3
A curing agent was obtained by roll kneading 0 parts by weight, 3.5 parts by weight of dioctyl phthalate, 110 parts by weight of ground calcium carbonate, 6.5 parts by weight of red iron oxide and 2.5 parts by weight of lead octylate. 50 parts by weight of the above-mentioned prepolymer, 50 parts by weight of a curing agent, red iron oxide rubber chips (average particle diameter 3 mm)
50 parts by weight, 6 parts by weight of lauric acid-treated calcium carbonate and 10 parts by weight of xylene were uniformly mixed and placed in a container of a mortar gun, and the surface of the elastic paving material layer pre-applied with the above two-component curable resin composition was applied. The high-pressure air from the air compressor was used to blow the air at a rate of 3.5 kg / m ² . Immediately after spraying, a surface layer similar to that of Example 1 was formed, but the viscosity of the mixed composition increased with the passage of time, the "slip resistance coefficient" of the cured surface layer became small, and it became slippery.

[0034]

Since the present invention is configured as described above, it has the following effects. The one-part curable resin composition that is a base for compounding the granular rubber chips does not require the compounding / mixing operation unlike the two-part type, has good work efficiency, and is not restricted by the pot life. It cures quickly in air, and the cured surface coating film does not foam and has excellent mechanical properties. Since the one-component curable resin composition forms an uneven surface integrated with the granular rubber chips, it firmly adheres to the base and has high strength. Therefore, it is hardly worn or damaged by spikes or the like. Thus, the elastic pavement material according to the present invention has a slip resistance,
It excels in running and use feeling and does not cause fatigue to the human body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a surface of an elastic pavement made of the elastic pavement material of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of an elastic pavement surface of the elastic pavement material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Elastic pavement material layer 2a, 2b ... Granular rubber chip 3a, 3b ... Protrusion 4a, 4b ... Uneven part 5a, 5b ... Surface layer 6 ... Rubber chip adhesive layer

Claims (2)

[Claims] 1. A urethane prepolymer having two or more isocyanate groups at the terminal and a blocked amine compound which does not substantially react with the isocyanate group and produces a primary or secondary amino group by moisture. The average particle size is 0.1 to 100 parts by weight of the liquid curable resin composition.
A moisture-curable elastic pavement material characterized by containing 10 to 300 parts by weight of 10 mm granular rubber chips. 2. The elastic pavement material according to claim 1 is blown onto a base material by air pressure to form an uneven portion having rounded projections with built-in granular rubber chips on the surface, and the uneven portion is left to stand naturally. A method for constructing an elastic pavement surface, characterized by hardening.