JP2002047610A - Surface finishing method of elastic pavement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a uniform and beautiful pavement surface for reducing nonuniformity of painting even at a high temperature by executing the pavement surface on various recess-projection surfaces of polyurethane elastic pavement by this improved painting method. SOLUTION: This surface finishing method of elastic pavement is characterized in that a polyurethane material blended with a high boiling point solvent having a boiling point not less than 140 deg.C under atmospheric pressure is continuously supplied to a force feed roller machine, and is leveled in the right-angled direction to the advancing direction of the painting, and is continuously applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for finishing a surface of elastic pavement with polyurethane.

[0002]

2. Description of the Related Art A remarkable progress has been made in an elastic pavement method using polyurethane, and various proposals have been made for improvement of a construction method. The present invention particularly relates to an improvement in a surface finishing method for a surface layer. In the polyurethane elastic pavement, an embossing process of a surface layer according to a use is indispensable, and a method of obtaining an uneven surface using a spray or a roller is performed.
For example, an uneven surface suitable for the track of an athletic stadium has been obtained, and there are many construction results. Reinforcement, contamination prevention on uneven surface,
A sealing material, that is, a top coat, is applied for the purpose of preventing slippage and aesthetics.

[0003]

Since the top coat is the last finish, emphasis is placed on aesthetics. The top coat is applied by a method such as spraying or a roller, but coating with a roller is recommended from the viewpoint of preventing pollution. The drawback of this method is that the rollers are striped and the aesthetics are easily impaired. Since various irregularities are usually applied to the surface of the polyurethane elastic pavement depending on the application, it is not easy to apply a top coat particularly uniformly. The conventional construction method is a method in which a polyurethane material is kneaded, then poured on a pavement surface, and finished by lining up and down with a manual roller. According to this method, the material thickens with the passage of time, so that there is a drawback that the material becomes uneven, the roller has a stripe pattern, and other finish patterns become non-uniform, and the appearance is impaired. This has been a problem especially during construction at high temperatures in the summer. Accordingly, an object of the present invention is to provide a method for coating a uniform top coat with small coating unevenness.

[0004]

As a result of various studies on a method of applying a uniform top coat, the present inventors have found that a polyurethane material containing a special high-boiling solvent is continuously supplied to a pressure feed roller to continuously apply the same. By overcoming the drawbacks described above, the present inventors succeeded in obtaining a uniform and beautiful pavement surface, and completed the present invention. As a method for continuous application, specifically, a particularly remarkable effect can be obtained by performing continuous application in a direction perpendicular to the direction of construction. The mechanism that brings about the effect of the present invention is as follows. First, the polyurethane material is continuously supplied at a uniform speed by using a pressure roller. Next, rapid drying of the coating material can be prevented by using a high boiling point solvent. In particular, this effect is great in construction at high temperatures in summer. In addition, as described later, as described later, the amount of the applied material can be made uniform by performing the application while slightly overlapping the direction in which the surface finishing proceeds in a direction perpendicular to the direction of the surface finishing by the pressure feeding roller. This is a synergistic effect of the above factors.

That is, the present invention is as follows (1) to (3). (1) A surface finishing method for an elastic pavement, characterized by continuously supplying a polyurethane material containing a high boiling point solvent having a boiling point of 140 ° C. or higher under normal pressure to a pressure roller machine and continuously applying the same. (2) The surface finishing method for elastic pavement according to (1), wherein the high boiling point solvent is a glycol ether ester-based polar solvent. (3) The surface finishing method for an elastic pavement according to (1) or (2), wherein the pressure feeding roller machine is a continuous pressure feeding airless roller machine.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As a polyurethane material containing a high boiling point solvent, a polyurethane material containing a solvent having a boiling point of 140 ° C. or more under normal pressure, particularly a glycol ether ester polar solvent, is used. Further, a matting agent, a non-slip agent and the like can be added as required.

Known polyurethane materials include two-component urethane compounds of prepolymer method, partial prepolymer method and one-shot method, one-component urethane compounds of moisture-curable type, solvent-type thermoplastic urethane compounds, There are urethane emulsion formulations and the like. As the raw material polyisocyanate, polyol, polyamine, catalyst, filler, plasticizer, pigment, and the like, known ones are used.

For example, in the case of a two-component urethane blend prepared by the prepolymer method, the urethane prepolymer is prepared by mixing an organic polyisocyanate and a polyol in a nitrogen stream according to a conventional method.
It can be manufactured by a method of heating at １００100 ° C. for several hours. Equivalent ratio of isocyanate groups in urethane prepolymer to hydroxyl groups in polyol (NCO / O
H) is usually 2 to 20, and the free isocyanate group contained in the urethane prepolymer is about 1 to 15% by weight.

The raw material polyisocyanate is 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate and a mixture thereof (hereinafter abbreviated as TDI), especially 2,4-isomer / 2,6-isomer. Weight ratio of 80/20 (TDI-80) and 65/35 (TDI-80)
65), crude tolylene diisocyanate, metaphenylene diisocyanate, diphenylmethane diisocyanate (MDI), polymethylene polyphenyl polyisocyanate (crude MDI), hexamethylene diisocyanate,
4,4′-dicyclohexylmethane diisocyanate,
Isophorone diisocyanate, etc., which are used alone or in combination. Particularly preferred in terms of weather resistance and durability are non-aromatic ones such as hexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate and their biuret and isocyanurate derivatives.

As the polyol, various polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, castor oil, polytetramethylene ether glycol and the like can be used. Polyoxyalkylene glycol obtained by adding propylene oxide or propylene oxide and ethylene oxide to water, propylene glycol, and the like, and glycerin, polyoxyalkylene triol obtained by adding propylene oxide and propylene oxide and ethylene oxide to trimethylolpropane, and the like are common. . However, particularly preferred from the viewpoints of weather resistance and durability are acrylic copolymers having two or more OH groups, for example, OH groups such as β-hydroxyethyl (meth) acrylate and β-hydroxypropyl (meth) acrylate. It is a so-called acrylic polyol which is a copolymer of a contained monomer, a hard monomer such as styrene and methacrylic acid ester, and a carboxylic acid-containing monomer such as (meth) acrylic acid. The polyol is used alone or in combination of two or more. The average molecular weight of the polyol is preferably from 75 to 10,000.

The curing agent is a polyamine and / or a polyol as an active hydrogen compound, and the polyamine is ethylenediamine, tetramethylenediamine,
Hexamethylene diamine, p-phenylenediamine,
3,3'-Dichloro-4,4'-diaminodiphenylmethane (MOCA), 3,3'-dimethyl-4,4'-diaminodiphenylmethane and the like are used. As the polyol, a known polyether polyol, polyester polyol, polymer polyol, or the like is used. The amount of active hydrogen compound used (equivalent ratio) is NCO / H (active hydrogen) =
The amount is 0.95 to 2.0.

Examples of the catalyst include known amines,
Organometallic compounds (tin, lead) are suitable. For example, tin octoate, dibutyltin dilaurate, lead octoate, lead naphthenate and the like are used alone or in combination. The amount used is preferably 0.1 to 5% by weight based on the total amount of the curing agent. As the filler, for example, calcium carbonate, talc, clay, carbon black, silicic anhydride (white carbon), zeolite, and titanium dioxide are preferable. These fillers can be used alone or as a mixture. The amount used is 2 to 50% by weight based on the total amount of the curing agent.
Is preferred.

Examples of the plasticizer include dioctyl phthalate (DOP), dibutyl phthalate (DBP), dioctyl adipate (DOA), and tricresyl phosphate (TC).
P), chlorinated paraffin, U-Rex (alicyclic polymer-modified natural resin ester, manufactured by Tokyo Resin Kogyo KK) and the like.
Examples of the pigment include inorganic pigments such as chromium oxide and red iron oxide, and organic pigments such as a phthalocyanine pigment and an azo pigment.

As the matting agent, fine-particle silica (trade name: Esilyl, Carbosil, Carplex, etc.), polyolefin oligomer, etc. are used. As the anti-slip agent, for example, alumina silicate-based hollow granular material (trade name: Philite, silica balloon, Sankilite, etc.)
Is preferably used.

[0015] As the high boiling point solvent, a boiling point of 140 at normal pressure
An organic solvent having a temperature of not less than ° C. is used, and ordinary aromatic and aliphatic solvents can be used. However, in practice, glycol ether ester solvents are particularly preferable. Examples of glycol ether ester-based high boiling solvents include ethylene glycol ethyl ether acetate (cellosolve acetate), propylene glycol methyl ether acetate (PGMAC), ethylene glycol methyl ether acetate (methoxy cellosolve acetate), propylene glycol ethyl ether propionate, ethylene Glycol ethyl ether propionate and the like and a mixture of two or more thereof are used. Each of these solvents has a boiling point of 140 ° C. or higher, and has excellent solubility because of its polarity.

As the pressure feeding roller machine, any one capable of continuous coating by a pressure feeding method can be used. Normally, a commercially available continuous pressure airless roller is suitable, and for example, Seiwa Sangyo Co., Ltd. TB-9 type, RC-9 type, RR-1 type, Wagner CRG-8 type and the like are suitably used. The coating method using a roller is performed by continuously applying a polyurethane material continuously supplied to a pressure feeding roller machine. As a specific application method, for example, the surface finishing of the track of the athletic stadium is performed in units of lanes, but the construction of one lane is performed as shown in FIG.
It is preferable to apply while slightly overlapping in the direction (2) at right angles to the direction. According to the conventional method of kneading the polyurethane material and then pouring it on the pavement surface and finishing it horizontally and horizontally with a manual roller, the material thickens with the passage of time. Although a pattern was formed and other finished patterns became non-uniform, according to the method of the present invention, a uniform pavement surface with small coating unevenness can be obtained.

As a base elastic pavement on which the surface finishing method of the present invention is applied, all known pavement systems can be used. As the paving material, all known materials such as polyurethane, acrylate copolymer, styrene / butadiene rubber (SBR), ethylene / vinyl acetate copolymer (EVA), polyamide, polyester, and polyepoxide are used alone or in combination. It is used as a composite material by the above combination. Most preferably used are polyurethanes, all known material systems, i.e. prepolymer, partial prepolymer and one-shot two-part urethane formulations, moisture-curable one-part urethane formulations. A solution-type thermoplastic urethane compound, a urethane emulsion compound, and the like are used. These resins may contain various rubber chips. The pavement method differs depending on the type of the resin. For example, a known method is used as the polyurethane elastic pavement method. That is, a base conditioner, a primer, and the like are applied as needed to a base such as ascon, concrete, mortar, and the like, and then a polyurethane layer is applied. Known polyurethane materials described above are used for the polyurethane layer. In addition, the surface can be finished according to the intended use, such as, for example, uneven surface finish by spray embossing or roller embossing.

[0018]

The present invention will be specifically described below with reference to examples. Parts in the examples represent parts by weight. In each of the examples and the comparative examples, both the air temperature and the liquid temperature were about 30 ° C., and the surface temperature of the construction place was 40 to 50 ° C. First, a urethane prepolymer used as a polyurethane layer and a curing agent were produced.

[Production of urethane prepolymer] 430 parts of polyoxypropylene diol having an average molecular weight of 2,000,
400 parts of polyoxypropylene triol having an average molecular weight of 5000, TDI-65 (2,4-form / 2,6-form = 65/35)
Of tolylene diisocyanate), and uniformly mixed at 80 ° C. for 2 hours in a nitrogen stream, then at 100 ° C.
For 2 hours. A urethane prepolymer having an NCO group content of 2.9% by weight and a viscosity of 6,000 cps / 25 ° C. was obtained.

[Production of curing agent] Polyoxypropylene diol 20 having 7.5 parts of MOCA and an average molecular weight of 3000
Parts, 20 parts of polyoxypropylene triol having an average molecular weight of 5000, 6 parts of DOP, 39.5 parts of calcium carbonate
Parts, 2 parts of lead catalyst octylate (pb content: 25%) and 5.0 parts of pigment bengara were added and uniformly kneaded with a dissolver to obtain a curing agent.

Example 1 A polyurethane elastic pavement obtained by mixing the above urethane prepolymer (base resin) and a curing agent at a weight ratio of 1/1 was applied to an asphalt concrete base so as to have a thickness of 12 mm. After curing at room temperature for one day, the main ingredient 100
Parts, 100 parts of curing agent, 7 parts of Esilyl # 200, 1 part of polyethylene glycol (molecular weight: 3,000) and 35 parts of toluene, using a tile gun equipped with a tip having a diameter of 5 mm and an air pressure of 5 kgf / cm ² To obtain a concavo-convex surface having protrusions having a height of 1 to 2 mm and a diameter of 2 to 6 mm. Next, as a top coat, 1.1 parts of ultrafine silica (Ezile 200), Filite 52/7 (F) were added to 10 parts of the main agent and 9 parts of the curing agent.
G) 1.6 parts and 11 parts of solvent cellosolve acetate were added, and the material obtained by mixing was continuously supplied to a TB-9 type press roller machine manufactured by Seiwa Sangyo Co., Ltd., in a direction perpendicular to the direction of coating. About 0.3 kg / m ² continuously with a roller. The surface after curing is uniform and uniform in coating.
A beautiful pavement surface was obtained.

Example 2 In Example 1, a top coat GS mainly composed of a two-pack type acrylic urethane resin was used as the top coat.
(Taisei Kako Co., Ltd., solid content: about 50%)
In a mixture of 0 parts / 30 parts, fillite 52/7 (FG)
Was mixed with 11 parts of a mixed solvent of PGMAC (propylene glycol methyl ether acetate) and methoxycellosolve acetate. Uniform and beautiful pavement surface with small coating unevenness was obtained.

Comparative Example 1 The procedure of Example 1 was repeated, except that 11 parts of toluene was used instead of 11 parts of cellosolve acetate as the top coat. Was big.

Comparative Example 2 In Example 1, after the top coat material was kneaded, the material was poured on a pavement surface, and finished by lining up and down with a manual roller. As a result, unevenness in the material flow and stripes of the roller appeared. And the finished pattern became non-uniform.

[0025]

According to the present invention, an improved coating method of the present invention, that is, a top coat material containing a special high-boiling solvent is applied on various uneven surfaces of a polyurethane elastic pavement at right angles to the direction of coating by using a pressure roller. The effect is remarkable because a uniform pavement surface with small coating unevenness can be obtained even at a high temperature by coating by smoothing with a roller in the direction.

[Brief description of the drawings]

FIG. 1 is a schematic view of the continuous coating of the present invention.

[Explanation of symbols]

 1: Construction direction of surface finish. 2: Direction of application by pressure roller. A: Coated surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiharu Ishibashi 3-7-10 Kojimachi, Chiyoda-ku, Tokyo Toyo Sports Facilities Co., Ltd. (72) Inventor Toshiharu Shibahara 3-7-10 Kojimachi, Chiyoda-ku, Tokyo Toyo Sports Facility Co., Ltd. (72) Inventor Kenji Kobayashi 3-7-10 Kojimachi, Chiyoda-ku, Tokyo Toyo Sports Facility Co., Ltd. F-term (reference) 2D051 AB02 AB04 AG13 AH01 EA05 EB05

Claims (3)

[Claims] 1. A method for finishing a surface of an elastic pavement, comprising continuously supplying a polyurethane material containing a high-boiling solvent having a boiling point of 140 ° C. or more under normal pressure to a pressure feeding roller machine and continuously applying the same. 2. The method according to claim 1, wherein the high boiling point solvent is a glycol ether ester-based polar solvent. 3. A method for finishing a surface of an elastic pavement according to claim 1, wherein the pressure-feeding roller machine is a continuous pressure-feeding airless roller machine.