JPH0711602A - Ballast consolidation method - Google Patents

Abstract

PURPOSE:To prevent the scatter of ballast by spraying two-part curable urethane elastomer having specific performance on the ballast by means of a spray, a consolidating it without preventing draining efficiency, etc., to combine them with each other. CONSTITUTION:Two-part curable flame retardent urethane elastomer wherein tack-free time after mixing a main agent with a hardener at 25 deg.C of atmospheric temperature is 0.5 seconds - 30 minutes, surface intrinsic resistance value is more than 1X10<8>OMEGA with dynamic elastic modulus 1X10<5>-1X10<11>dyne/cm<2> at -20 deg.C to 40 deg.C of atmospheric temperature and 0.01-2.0 of loss tangent value (tandelta) is sprayed on the surface of ballast on a rail road bed, etc., by means of a spray, so that foaming magnification reaches 1.1-10 times. Ballast is consolidated in a state to have voids among ballast and is formed together as a unit, and train load dispersion efficiency, vibration absorbing efficiency, electric insulation efficiency, lateral pressure resistance efficiency, draining efficiency, etc., are not prevented. According to the constitution, ballast can be prevented from being scattered by strong wind, snowing, suction cleaning, etc.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for consolidating ballast.

[0002]

2. Description of the Related Art Ballast is used in track beds, parks, roads, etc., and is cemented to prevent scattering. There are two types of trackbeds, slab type and ballast type with crushed stones and gravel, etc., to distribute the train load transmitted from the sleepers, absorb vibration during train passage, and electrically insulate the lines to control the signal system. Have an important role in.
In the case of the ballast method, the wind pressure that occurs when the train runs at high speed and snow damage caused by melting and falling of snowflakes adhering to the train in the cold areas where there is snow in the winter, ballast scatters and damages the vehicle and may affect track maintenance personnel. The ballast's compaction state changes due to damage or repeated vibrations due to passing trains, and in the worst case, ballast collapses, and it becomes impossible to withstand the lateral pressure (lateral pressure resistance value) applied to the sleepers when the train is running. Or, there is a problem that the train may not run due to the collapse of ballast due to rainfall. In addition, cigarette butts and dust are thrown into the ballast just below the platform, which blocks the ballast's voids and deteriorates drainage.
Since the vacuum cleaner also sucks in ballast, the station staff remove it manually each time, but it is a great effort and there is a strong demand for the development of an easy cleaning method that can be performed with a vacuum cleaner. Therefore, a mixture of acrylic emulsion (JP-A-4-296385) or synthetic rubber latex and cement (JP-A-52-16).
No. 810) and the like to fix the ballast.

[0003]

However, when the acrylic emulsion is sprayed, since it is a low-viscosity Newtonian liquid, it flows deep into the bed before drying and almost no resin is left between the ballasts of the bed, and The problem is that only sufficient adhesive strength is obtained to allow ballast to collapse when walking on the floor, preventing ballast scattering and improving lateral pressure resistance during train travel. Is long and poor in workability, and if there is train running before drying, vibration will cause ballast movement and sticking cannot be done, or if there is rainfall when not dry, resin will be washed away with water and water pollution will occur, water absorption in rainy weather Then, there was a problem that the electric insulation was deteriorated and the signal system control became impossible. When a mixture of synthetic rubber latex and cement was sprinkled, there was a problem that although the fixing performance was good, the vibration absorbing property, the load dispersive property, and the sticking workability were poor.

[0004]

DISCLOSURE OF THE INVENTION The inventors of the present invention have made it possible to prevent ballast from scattering, lateral pressure resistance, and adhesion between ballasts without impairing train load dispersion, vibration absorption, drainage, etc. of a roadbed. As a result of diligent study for the purpose of obtaining a ballast consolidating method with good strength, curability, sturdiness workability (malti workability), electric insulation, sound insulation, easy cleaning and flame retardancy The present inventors have found that the above-mentioned various performances can be satisfied by a method of using a urethane elastomer having high performance and using a specific spraying device, and thus reached the present invention. That is, the present invention is
A ballast consolidating method for consolidating ballast laid for a ballast ballast orbit with a two-component curable urethane elastomer, wherein the two-component curable urethane elastomer has an ambient temperature of 25 ° C. The tack-free time after mixing the main agent and curing agent below is 0.5 seconds ~
It has a surface resistivity of 1 × 10 ⁸ Ω or more and a dynamic elastic modulus of 1 × 10 ⁵ to 1 × 10 ¹¹ dyne / cm in an ambient temperature range of −20 ° C. to 40 ° C. ² ,
The loss tangent (tan δ) value is 0.01 to 2.0,
(2) Each component liquid of the two-component curing type urethane elastomer is applied on the ballast by using a two-component mixing type resin spray device having a self-cleaning mechanism, and the ballasts are bonded to each other to form an integrated ballast layer. This is a ballast consolidating method characterized by:

In the present invention, examples of the two-component curing type urethane elastomer include those comprising a main agent containing an organic polyisocyanate compound as a main component and a curing agent containing an active hydrogen-containing compound as a main component. Examples of the organic polyisocyanate compound include (a) carbon number [excluding carbon in NCO group, the same applies to (b) to (d)] 2 to 12
Aliphatic polyisocyanate of (b) having 4 to 15 carbon atoms
Alicyclic polyisocyanate, (c) araliphatic polyisocyanate having 8 to 12 carbon atoms, (d) 6 to 30 carbon atoms
And (e) modified products of these polyisocyanates and mixtures thereof.

Specific examples of the aliphatic polyisocyanate (a) include ethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), dodecamethylene diisocyanate, 2,
2,4-trimethylhexamethylene diisocyanate,
Examples thereof include lysine diisocyanate and 1,3,6-hexamethylene triisocyanate.

Specific examples of the alicyclic polyisocyanate (b) include isophorone diisocyanate (IPDI),
Dicyclohexylmethane-4,4′-diisocyanate (hydrogenated MDI), 1,4-cyclohexane diisocyanate, methylcyclohexane-2,4-diisocyanate (hydrogenated TDI), 1,4-bis (2-isocyanatoethyl) cyclohexane, etc. can give.

Specific examples of the araliphatic polyisocyanate (c) include p-xylene diisocyanate and tetramethyl xylene diisocyanate.

Specific examples of the aromatic polyisocyanate (d) include 1,4-phenylene diisocyanate, 2,
4- or 2,6-toluene diisocyanate (TD
I), diphenylmethane-2,4'- or 4,4'-
Diisocyanate (MDI), naphthalene-1,5-diisocyanate, 3,3′-dimethyldiphenylmethane-4,4′-diisocyanate, o-tolidine diisocyanate, crude TDI, polyphenylmethane polyisocyanate (crude MDI) and the like can be mentioned.

Specific examples of the modified polyisocyanate (e) include carbodiimide groups (a) to (d),
Examples thereof include modified products in which a uretdione group, a uretoimine group, a urea group, a buret group, an isocyanurate group, a urethane group and the like are introduced. A specific example is a urethane prepolymer having an isocyanate group at the terminal derived from castor oil and MDI. Preferred among (a) to (e) are (b), (c), (d) and (e).

Examples of the active hydrogen-containing compound include polyhydric alcohols (a), polyoxyalkylene polyols (b), polyester polyols (c), polyolefin polyols (d), acrylic polyols (e), castor oil-based polyols (f ), Polymer polyol (G), organic amine compound (H), and mixtures thereof.

Specific examples of the polyhydric alcohol (a) include aliphatic dihydric alcohols (ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, neopentyl glycol, 1,6- Hexanediol, 1,8-octamethylenediol, etc.), low-molecular-weight diols having a cyclic group [1,4-bis (hydroxymethyl) cyclohexane, m- and p-xylylene glycol, 1,4
-Bis (2-hydroxyethoxy) benzene, 1,4-
Bis (α-hydroxyisopropyl) benzene, 2,2
-Bis (4-hydroxyethoxyphenyl) propane, etc.] Trihydric alcohols (glycerin, trimethylolpropane, hexanetriol, etc.), tetrafunctional or higher polyhydric alcohols (sorbitol, sucrose, etc.), alkanolamines ( Triethanolamine,
Methyldiethanolamine etc.) and the like.

Examples of the polyoxyalkylene polyol (b) include active hydrogen-containing compounds [polyhydric alcohols (as exemplified above), low molecular weight amines (low molecular weight polyamines such as ethylenediamine, tetramethylenediamine and hexamethylenediamine) , Low-molecular monoamines such as n-butylamine and stearylamine), phenols (hydroquinone, bisphenol A, etc.)],
Examples thereof include those to which alkylene oxides (alkylene oxides having 2 to 4 carbon atoms, such as ethylene oxide, propylene oxide, butylene oxide and combinations thereof) have been added (in the case of combination, block or random addition may be used). Specific examples of the polyoxyalkylene polyol (b) include polyoxypropylene glycol, polyoxypropylene triol, polyoxyethylene polyoxypropylene glycol, polyoxyethylene polyoxypropylene triol, polyoxypropylene tetraol, and polyoxytetramethylene glycol. And so on.

As the polyester polyol (c),
Condensed polyester polyols obtained by reacting the polyhydric alcohols (a) exemplified above with dicarboxylic acids, polylactone polyols obtained by ring-opening polymerization of lactones, obtained by reacting ethylene carbonate with 1,6-hexanediol Polycarbonate polyols and the like are included.

Examples of the dicarboxylic acids constituting the condensed polyester polyol include aliphatic dicarboxylic acids (succinic acid, adipic acid, sebacic acid, glutaric acid, azelaic acid, maleic acid, fumaric acid, etc.) and aromatic dicarboxylic acids (terephthalic acid). Acid, isophthalic acid, etc.), anhydrides of these dicarboxylic acids, lower alkyl (C1-C4) esters or halides (chloride, etc.), and mixtures of two or more thereof. Examples of the lactone include ε-caprolactone.

Specific examples of these polyester polyols (c) include polyethylene adipate, polybutylene adipate, polyhexamethylene adipate, polyneopentyl adipate, polyethylene propylene adipate, polyethylene butylene adipate, polybutylene hexamethylene adipate, polydiethylene adipate. , Poly (polytetramethylene ether) adipate,
Examples thereof include polyethylene azelate, polyethylene sebacate, polybutylene azelate, polybutylene sebacate, polyethylene terephthalate, polycaprolactone diol, and polycarbonate diol.

Specific examples of the polyolefin polyol (d) include polybutadiene polyol, hydrogenated polybutadiene polyol, polyisoprene polyol and the like.

As the acrylic polyol (e), a hydroxyl group-containing ethylenically unsaturated monomer [hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, etc.] and other than that are disclosed in JP-A-4-292683.
Examples thereof include a copolymer of an ethylenically unsaturated monomer described in JP-A No. 1994-242242. Specific examples of the acrylic polyol (e) include copolymers of hydroxyethyl acrylate and ethyl acrylate, copolymers of hydroxyethyl acrylate, ethyl acrylate and styrene, and the like.

As the castor oil-based polyol (f), for example, castor oil, polyester polyol of castor oil fatty acid and polyhydric alcohol (a) or polyoxyalkylene polyol (mono- or diglyceride of castor oil fatty acid, castor oil fatty acid and Mono-, di- or triesters with trimethylolpropane, mono- or diesters with castor oil fatty acid and polyoxypropylene glycol), castor oil with alkylene oxide added, and mixtures of two or more thereof.

Examples of the polymer polyol (g) include (b)
Polymeric polyols obtained by polymerizing the ethylenically unsaturated monomer [II] described in JP-A-4-292683 in each of the polyols [I] exemplified in the items (1) to (4) are mentioned. The content of the ethylenically unsaturated monomer [II] constituting the polymer polyol (g) is usually 0.1 to 90.
%, Preferably 5.0 to 80% by weight. As a method for producing the polymer polyol (g), for example, a method of polymerizing an ethylenically unsaturated monomer [II] in a polyol [I] in the presence of a polymerization initiator (radical generator, etc.) (US Patent No. 3383351, Japanese Patent Publication No. 39
No. 24737, Japanese Patent Publication No. 47-47999, and Japanese Patent Laid-Open No. 5
0-15894).

The organic amine compound (H) is C2
~ C6 alkylenediamine (ethylenediamine, tetramethylenediamine, hexamethylenediamine, etc.);
Polyalkylene (per alkylene group, C2-C6)
Polyamine [diethylenetriamine, iminobispropylamine, bis (hexamethylene) triamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, methylaminopropylamine, methyliminobispropylamine, etc.]; alicyclic or heterocyclic polyamine Class (C4-C15) [N-aminoethylpiperazine, 1,3-diaminocyclohexane, isophoronediamine, hydrogenated methylenedianiline, etc.];
Aliphatic polyamines having an aromatic ring (C8 to C15)
[Xylenediamine, tetrachloro-p-xylenediamine, etc.]; Aromatic polyamines (C6 to C20)
[Phenylenediamine, toluenediamine, methylenedianiline, diaminodiphenylsulfone, benzidine,
Thiodianiline, methylenebis (o-chloroaniline), m-aminobenzylamine, 4,4'-diamino-3,3'-dimethyldiphenylmethane, 1-methyl-
3,5-diethyl-2,4-diaminobenzene, 1-methyl-3,5-diethyl-2,6-diaminobenzene,
2,2 ′, 3,3′-tetrachloro-4,4′-diaminodiphenylmethane and the like]; and polyoxyalkylene polyamine (polyoxypropylene diamine, polyoxypropylene triamine and the like) and the like.

The active hydrogen equivalent of the active hydrogen-containing compound is usually 31 to 10,000, preferably 31 to 5,
It is 000. The number of functional groups is usually 2 to 10, preferably 2 to 8. The equivalent ratio of the NCO group in the main agent to the active hydrogen group in the curing agent (active hydrogen / NCO) is usually 0.5 to 2.0, preferably 0.6 to 1.5, and more preferably 0. 8 to 1.2.

Of the compounds exemplified as the active hydrogen-containing compound, the preferable ones have an oxyethylene group content of 50.
It excludes polyoxyalkylene polyol in an amount of not less than wt%. If the content of oxyethylene groups is 50% by weight or more, the water absorption rate increases and the surface resistivity decreases, which impedes signal system control. The surface resistivity is preferably 1 × 10 ⁸ or more when the elastomer is wet, and when it is less than 1 × 10 ^8, it becomes a semiconductor or conductor and loses electrical insulation. However, it is necessary to pay particular attention to the electric resistance value during rainfall, as it may cause malfunctions such as signals.

To impart flame retardancy, a method of introducing a flame retardant into the molecule of the main agent, a method of blending it with a curing agent, and the like can be mentioned. By imparting flame retardancy, it is possible to prevent fire hazards from pantograph sparks and vehicle fires. As flame retardants, non-halogen phosphates (triphenyl phosphate, cresyl diphenyl phosphate, ammonium polyphosphate, etc.), halogen-containing phosphates [trischloroethyl phosphate, trisdichloropropyl phosphate, tris
(Tribromophenyl) phosphate, trisdibromopropylphosphate, tris (tribromoneopentyl) phosphate, etc.], active hydrogen-containing flame retardant [di (isopropyl) N, N-bis (2-hydroxyethyl) aminomethylphosphonate] Nate, alkylene oxide adduct of brominated bisphenol A, dibromoneopentyl glycol, etc.], halogen-based flame retardant (tetrabromobisphenol A, decabromodiphenyl ether, tribromophenol, chlorinated paraffin, etc.),
Urea, urea derivatives (reactants of urea and formalin, etc.),
Thiourea, melamine, melamine derivatives (reactants of melamine and formalin, etc.), metal oxides (antimony trioxide, animony pentoxide, zinc oxide, etc.), metal hydroxides (aluminium hydroxide, magnesium hydroxide, etc.), red Examples include phosphorus. The above examples are
One kind or two or more kinds may be used. Elastomers for the purpose of the present invention are often exposed to wind and rain or sunlight for a long period of time, hydrolyzed by water or sunlight, photolyzed, thermally decomposed, flame retardant method difficult to be extracted with water. Is preferred. A preferable flame retarding method is to use, for example, an active hydrogen-containing flame retardant, a heat decomposable flame retardant, or a water-insoluble flame retardant. Suitable flame retardants are non-halogen phosphate esters, halogen-containing phosphate esters, active hydrogen-containing flame retardants, metal oxides, metal hydroxides, halogen-based flame retardants, melamine, melamine derivatives, and red phosphorus. The amount of the flame retardant used is usually 0.1 to 40 parts with respect to 100 parts of the urethane elastomer. Flame retardance is JIS-D1
It is judged to be 201, and those having ranks of self-extinguishing property or flame retardant grade 1 to flame retardant grade 4 are preferable.

The curing speed may be set according to the purpose by, for example, changing the type and amount of the catalyst and blending it with the curing agent. As the catalyst, dibutyltin dilaurate, alkyl titanate, organosilicon titanate, stannas octoate, lead octylate, zinc octylate, bismuth octylate, bismuth neodecanoate, dibutyltin diorthophenylphenoxite, tin oxide. -Based catalysts such as reaction products of ester and ester compounds (dioctyl phthalate, etc.), monoamines [triethylamine, etc.], diamines [N, N, N ′, N′-tetramethylethylenediamine, etc.], triamines [N, N , N ', N ",
N "-pentamethyldiethylenetriamine, etc.], amines such as cyclic amines [triethylenediamine, etc.], etc. The catalyst may be a metal-based or amine-based alone or a combination of metal-based and amine-based catalysts. The amount of catalyst may be adjusted according to the purpose of consolidating ballasts. Normally, for the purpose of preventing scattering and easy cleaning, only the ballasts of the three surface layers of the ballast ballast should be consolidated. For the purpose of improving lateral pressure resistance and preventing ballast collapse, the amount of catalyst is reduced to the middle and lower layers of ballast ballast to reduce the amount of catalyst and tack-free. The liquid injection distance is adjusted by lengthening the time, and the amount of the catalyst is usually 0.001 to 10 parts by weight with respect to 100 parts by weight of the curing agent.
The tack free time is usually 0.5 seconds to 30 minutes. For the purpose of preventing scattering and easy cleaning, it is preferably 0.5 seconds to 10 minutes. When the purpose is to improve lateral pressure resistance and prevent ballast collapse, it is 10 seconds to 30 minutes. Workability is good if construction is performed using materials adjusted to tack-free time within this range.For example, even if the construction time is only after the last train until the first train, the urethane elastomer is sufficiently cured and the vibration of the first power generation vehicle causes vibration. Ballast collapse does not occur and construction can be performed without problems.

The dynamic elastic modulus and the loss tangent (tan δ) of the two-component curing type urethane elastomer are characteristic values showing scattering prevention property, lateral pressure resistance property, vibration absorption property, sound insulation property, and are important. . The dynamic elastic modulus is 1 × 10 ⁵ to 1 × 10 ¹¹ dyne / cm ² in the ambient temperature range of −20 ° C. to 40 ° C., which is the normal ballast surface temperature, and preferably 1 × 10 ⁷ to 1 ×. It is 10 ¹¹ dyne / cm ² . If the dynamic elastic modulus is less than 1 × 10 ⁵ dyne / cm ^2, it is too soft and lateral pressure resistance is insufficient. Loss tangent (tan δ)
Is the normal ballast surface temperature of -20 ° C to 40 ° C.
In the ambient temperature range of 0.01 to 2.0, it is preferably 0.05 to 2.0. tan δ is 0.01
When it is less than 1, the vibration absorbing property and the sound absorbing property are insufficient.

When the two-component curing type urethane elastomer is made of a foamed material, the adhesion area between the ballasts is increased, the adhesion strength is enhanced, and the vibration absorbing property and the sound absorbing property are improved, which is preferable.
Examples of the foam include a method in which water or a Freon-based foaming agent is added to the curing agent to form the foam. A preferred method is a method of adding water that does not pollute the environment. The expansion ratio can be adjusted by the amount of water, freon-based foaming agent, or the like added. The expansion ratio is usually 1.1 to 10 times, preferably 1.1 to 5 times. If the expansion ratio exceeds 10 times, the dynamic elastic modulus of the elastomer decreases, which is not preferable.

The main agent and curing agent of the present invention may contain, as other components, a filler, a plasticizer, an antiaging agent, a thixotropy imparting agent and its imparting auxiliary agent. However, even if the commonly used solvent is not mixed in the two-component curing type urethane elastomer consisting of the main agent and the curing agent of the present invention, the respective component liquids have sufficiently low viscosities, and a solvent having a self-cleaning mechanism is used. It is not necessary because it can be installed using a liquid-mixing type resin spray device, and it is not preferable because it causes environmental pollution and fire caused by the scattering of the solvent. Examples of the filler include fillers (heavy calcium carbonate, talc, mica, etc.), resins (vinyl chloride, polyethylene, etc.), and the like. Examples of the plasticizer include dioctyl phthalate, dibutyl phthalate, dioctyl adipate, dioctyl sebacate, petroleum resin and the like. As an anti-aging agent, hindered amine-based [4-benzoyloxy-2,2,6,6
-Tetramethylpiperidine (Sankyo LS-74 manufactured by Sankyo)
4) etc.], hindered phenolic [octadecyl-
3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate (Irganox 1076 manufactured by Ciba-Geigy, Japan, etc.), benzophenone-based (2-hydroxy-4-methoxybenzophenone, etc.), benzotriazole-based [2- (5-methyl-2-hydroxyphenyl) benzotriazole and the like] and the like. Examples of the thixotropy imparting agent include ultrafine silica powder, hydrogenated castor oil, bentonite, carbon black, and precipitated calcium carbonate. Examples of the thixotropy imparting aid include polyoxyethylene diol, polyoxyethylene polyoxypropylene triol, dimethyl sulfoxide, and the like.

As an example of a method for producing a modified product of polyisocyanate as a main agent, for example, a reaction vessel is charged with an organic polyisocyanate and a polyol, and a reaction temperature is 50 to 120 ° C.
It can be produced by reacting with. In addition, the production method of the curing agent is exemplified, for example, it can be produced by kneading an active hydrogen compound and a flame retardant with a planetary mixer.

As the construction method of the present invention, [a] a method for spray construction while collision-mixing the main agent and the curing agent using a two-liquid mixing type resin spraying apparatus equipped with a self-cleaning mechanism, [b] self-cleaning mechanism And a spraying method using a sprayer of a type in which a main agent and a curing agent are mixed with a static mixer or a mixing head driven by air or electric. A preferred method is to have a self-cleaning mechanism [a]
Is the method. As a concrete model, a combination of the proportion unit of Model H-2000 or Model FF-1600 of Gasmer and GX-7 or D spray gun can be cited.

The spray amount of the two-component curing type urethane elastomer is 0.1 to 0.1 for the purpose of preventing scattering and easy cleaning.
It is 5 Kg / m ² . Preferably, 0.5 to 3 Kg / m ²
Is. For the purpose of improving lateral pressure resistance and preventing ballast collapse, it is 1 to 30 kg / m ² . Preferably,
It is 1 to 20 Kg / m ² .

The consolidation method of the present invention is applied to load dispersion, vibration absorption, sound absorption, sound absorption, drainage, scattering prevention, lateral pressure resistance, adhesive strength, curability, and staking workability. ,
It is suitable for consolidating ballasts of roadbeds that require electrical insulation, flame retardancy, weather resistance, heat resistance, water resistance, and the like.

[0033]

The present invention will be further described with reference to the following examples, but the present invention is not limited thereto. In the following, “part” means “part by weight”, “%” means “% by weight”, and “ratio” means “weight ratio”. The meaning of the abbreviations in the examples and the evaluation test method are shown below. (Abbreviation) C-O; number average molecular weight = 1060, low acid number castor oil,
[Made by Toyokuni Oil Co., Ltd., trade name: ELA-DR] GP-1000; number average molecular weight = 1000, polyoxypropylene triol, [Sanyo Chemical Co., Ltd.]
Product name: Sannix GP-1000] TP-400; number average molecular weight = 400, polyoxypropylene triol [manufactured by Sanyo Kasei Co., Ltd.,
Product name: Sannix TP-400] TBE; halogen-based active hydrogen-containing flame retardant, [Sanyo Chemical Industry Co., Ltd. product name: TBE-20G] Y-24; phosphorus-based active hydrogen-containing flame retardant, [SANYO KASEI Kogyo Co., Ltd., trade name: Y-24] TCP; flame retardant, tricresyl phosphate, [NOF CORPORATION, trade name: Anfram TCP] CR-900; flame retardant, Tris (tribromoneo). Pentyl) phosphate, manufactured by Daihachi Chemical Co., Ltd., trade name: C
R-900] Al; Aluminum hydroxide DTD; Dibutyltin dilaurate Pb: Lead octylate, [Sankyo Machine Gosei Co., Ltd., trade name: LL-690D] TEA; Triethylenediamine, [Sankyo Airpro, trade name: DABCO-33LV] DOP; dioctyl phthalate MDI; diphenylmethane diisocyanate MR; crude MDI [Nippon Polyurethane Co., Ltd., trade name: Millionate MR-100]

(Evaluation test method) (1) Tack free time (TFT): After spraying the two-component curing type urethane elastomer on ballast in an atmosphere of 25 ° C.,
Find the time to lose tack. (Unit = second) (2) Walkable time: After spraying the two-component curing type urethane elastomer on the ballast in the atmosphere of 25 ° C., the time for walking to lose the tackiness is calculated. (Unit = minutes) (3) Setting time: After spraying the two-component curing type urethane elastomer on the ballast in the atmosphere of 25 ° C., walk to find the time during which the ballast does not collapse. (Unit = min) (4) Penetration of the solidifying material into the roadbed; 50 × 50 × 70 (c
The empty container of m) is filled with ballast, and the two-component curing type urethane elastomer is sprinkled. After the elastomer is cured, the container is disassembled and the permeation distance of the two-component curing type urethane elastomer is measured. (Unit = cm) (5) Water permeability; 100 kg / m ² after the two-component curing type urethane elastomer is sprayed on the ballast and the elastomer is cured.
Sprinkle all of the water and measure the water penetration time. (Unit = second) (6) Disintegration property: The two-component curable urethane elastomer is sprayed on the ballast, and after the elastomer is cured, the disintegration property is measured by walking on the ballast. (Display method) ◎: No disintegration, ×: Disintegration (7) Multi-tie workability; Two-component curing type urethane elastomer is sprinkled on the ballast, and after the elastomer is cured, it is pierced and firmed to check the multi-tie workability. (Display method) ⊚: easily possible, ×: difficult (8) electrical insulation; surface specific resistance value is measured according to JIS K6911. (Unit = Ω) Curing condition during drying: After curing, 24 at 20 ° C. and 65% RH
Recover for hours. Curing condition when wet: After curing, it is immersed in water at 20 ° C. for 24 hours and subjected to a test in a wet state. (9) Dynamic elastic modulus (E ′) and loss tangent (tan δ) It was measured under a frequency condition of 10 Hz using a viscoelasticity tester. (Unit: E ′: × 10 ⁷ dyne / cm ² ) (10) Flammability: According to JIS D1201. (Display method) ◎: self-extinguishing, ×: slow-flammability, non-combustible: non-combustible (11) Water resistance After dipping the elastomer in warm water at 70 ° C for 20 days,
It was dried at 70 ° C. for 5 hours and subjected to a combustion test according to JIS D1201. (Display method) ⊚: self-extinguishing, ×: slow-flammability, non-combustible: non-combustible (12) Foaming ratio: Average liquid specific gravity of main agent and curing agent / density of cured product

Production Examples 1 to 3 of Main Agent [A] The components such as polyol (1) and organic polyisocyanate (2) shown in Table 1 were charged in a 4-necked Kolben in the amounts shown in Table 1, and the mixture was heated at 90 ° C. for 5 hours. The main agent <1> of the present invention is reacted to
<3> was obtained.

[0036]

[Table 1]

Production Examples 1 to 3 of Curing Agent [B] The amounts of the curing agent components shown in Table 2 are charged in a 4-necked Kolben, and the mixture is stirred and mixed at 110 ° C. for 1 hour to obtain the curing agent of the present invention [ 1] to [3] were obtained.

[0038]

[Table 2]

Examples 1 and 2 [A] and [B] shown in Table 3 in which the liquid temperature was adjusted to 40 ° C were placed on a ballast in an atmosphere of 25 ° C, and a two-liquid collision-mixing airless sprayer equipped with a self-cleaning mechanism was used. The coating amount shown in Table 3 was applied using a machine (equipped with GX-7 spray gun on Gasmer Model H-2000).
Table 3 shows the results of tests of the permeability of the solidified material into the roadbed, the walkable time, the solidification time, the water permeability, the walking disintegration property, and the Marutai workability using this test body. In addition, Table 3 shows the results of tests on electric insulation, flammability, etc., using a test piece having a thickness of 3 mm obtained by applying the same onto a mold.

[0040]

[Table 3]

Examples 3 and 4 [A] shown in Table 3 and Table 3 in which the liquid temperature was adjusted to 40 ° C.
[B] 100 parts of [B] shown in FIG. 2 and 0.2 parts of water are thoroughly mixed and mixed on a ballast in an atmosphere of 25 ° C. to form a two-liquid collision mixing type airless sprayer equipped with a self-cleaning mechanism (Gasmer Model H). A GX-7 spray gun was attached to -2000) to apply the coating amounts shown in Table 3.
Table 3 shows the results of tests of the permeability of the solidified material into the roadbed, the walkable time, the solidification time, the water permeability, the walking disintegration property, and the Marutai workability using this test body. In addition, similarly, the test piece having a thickness of 3 mm obtained by coating on a mold was used.
Table 3 shows the results of the tests for electric insulation, flammability, etc., and the expansion ratio.

Comparative Example 1 Acrylic emulsion [L-603: Morton Co., Ltd.
[Production] 100 parts of water and 100 parts of water were mixed and homogenized under an atmosphere temperature of 25 ° C. to 2 Kg / m ² on ballast.
Table 4 shows the results of tests of the penetration of the solidified material into the roadbed, the walkable time, the curing time, the water permeability, the walking disintegration property, and the multi-tasking workability using the test body obtained by coating. Also,
Similarly, Table 4 shows the results of an electrical insulation and flammability test conducted using a test piece having a thickness of 2 mm obtained by coating on a mold.

[0043]

[Table 4]

Comparative Example 2 Ethylene Vinyl Acetate Emulsion [Sumika Flex 40
0: Sumitomo Chemical Co., Ltd.]] 45 parts, sodium alkylbenzene sulfonate 1 part, calcium chloride 1 part, Portland cement 200 parts, water 55 parts are mixed, and the temperature of the atmosphere is 20 ° C. and the ballast is mixed. Using the test body obtained by applying ² Kg / m ² , the permeability of the solidifying material into the trackbed,
Table 4 shows the results of the tests on the walkable time, the curing time, the water permeability, the disintegration property, and the multi-tasking workability. Similarly, Table 4 shows the results of the electrical insulation and flammability tests carried out using the test pieces obtained by coating on the mold.

Comparative Example 3 Newport 80-4000 "manufactured by Sanyo Chemical Industry Co., Ltd., polyoxyethylene oxypropylene polyol, number average molecular weight = 4000, oxyethylene group content 80%" 400 parts and MDI 250 parts in a 4-necked Kolben. Charge 9
After reacting at 0 ° C for 5 hours, the mixture was cooled to 30 ° C and charged with 160 parts of dichloromethane to give a uniform liquid to obtain a main agent. The curing agent was prepared by weighing 70 parts of urea and 930 parts of water in a beaker and sufficiently dissolving urea. Using a test piece obtained by applying ² kg / m ² on ballast under a condition of an ambient temperature of 25 ° C with a two-head gun sprayer capable of mixing the main agent and the curing agent in a ratio of 100: 100, a solidifying material Table 4 shows the results of the tests on the permeability of the roadbed, the walkable time, the curing time, the water permeability, the walking disintegration property, and the Marutai workability. In addition, similarly, the results of the test for electrical insulation, the flammability, etc., and the foaming ratio, which were carried out using a test body having a thickness of 3 mm obtained by coating on a mold, are shown in Table 4.

Comparative Example 4 Table 4 shows the results of the same test as in Comparative Example 1 except that 10 kg / m ^{2 was} sprayed on the ballast.

The following is clear from Tables 3 and 4. For the purpose of preventing scattering of ballast and easy cleaning (Examples 1, 3 and 4 and Comparative Examples 1 to 3) In Example 1, Comparative Example 1 (acrylic emulsion) and Comparative Example 2 (ethylene having the same coating amount) were used. Compared with a vinyl acetate emulsion), the resin efficiently adheres to the surface layer in terms of permeability, and the disintegration property and the water permeability are also good, which is the purpose. In addition, walking time and setting time are short and workability is excellent. Furthermore, the surface resistivity when wet is high, and there is no danger in controlling the signal system. Further, it can be seen that both the dynamic elastic modulus and the loss tangent are within the usable range, and are well balanced as a whole. In Examples 3 and 4, as compared with Comparative Example 3 (water-based urethane foam) of the same foaming type, it is economical even if the coating amount is small, and it is high in surface resistivity when wet, and There is no danger in system control. Further, it can be seen that both the dynamic elastic modulus and the loss tangent are within the usable range, and are well balanced as a whole. Further, in Example 4, it is found that the water resistance is excellent and the flame retardance does not disappear for a long period of time, and that it is suitable for ballast consolidating of a roadbed exposed to sunlight and wind and rain.

For the purpose of improving lateral pressure resistance for preventing lateral deviation of the line and preventing collapse of ballast on the road shoulder (Example 2 and Comparative Example 4) In Example 2, Comparative Example 4 (acrylic emulsion, poly Compared with the oxyethylene group content of oxyalkylene polyol (80% by weight), the resin efficiently adheres to the middle and lower layers in terms of permeability, and the disintegration property and water permeability are also good, which is the purpose. Also, walking time,
It has a short setting time, excellent workability, high surface resistivity when wet, and there is no danger in controlling the signal system. Further, it can be seen that the water resistance is excellent and the flame retardance does not disappear for a long period of time, and that it is suitable for ballast consolidation of a roadbed exposed to sunlight and wind and rain. Further, it can be seen that both the dynamic elastic modulus and the loss tangent are within the usable range, and are well balanced as a whole.

[0049]

Industrial Applicability The ballast consolidating method of the present invention comprises: train load dispersion of roadbed, vibration absorption, sound absorption, drainage, ballast scattering prevention, lateral pressure resistance, adhesive strength between ballasts,
It has excellent curability, workability for sticking (malti workability), electrical insulation, water resistance, heat resistance, weather resistance, movement followability, and flame retardancy. In addition, there is no air pollution caused by organic solvents or CFCs, and no water pollution caused by resin emulsions.
The ballast consolidating method of the present invention is particularly useful for track bed ballast consolidating on the track because it has the above effects.

Claims (5)

[Claims] 1. A ballast consolidating method for consolidating ballast laid for a ballast ballast orbit with a two-component curable urethane elastomer, wherein (1) the two-component curable urethane elastomer comprises: The tack-free time after mixing the main agent and the curing agent under an ambient temperature of 25 ° C. is 0.5 seconds to 30 minutes, and has a surface specific resistance value of 1 × 10 ⁸ Ω or more. Dynamic elastic modulus of 1 × 10 ⁵ to 1 × in an ambient temperature range of 40 ° C. to 40 ° C.
10 ¹¹ dyne / cm ² , loss tangent (tan δ) value of 0.01 to 2.0, (2) two-component mixed type with self-cleaning mechanism for each component liquid of the two-component curable urethane elastomer A method for consolidating ballasts, characterized in that the ballasts are applied onto ballasts using a resin spraying device, and the ballasts are bonded together to form an integrated ballast layer. 2. The consolidation method according to claim 1, wherein the two-component curing type urethane elastomer is a flame retardant elastomer. 3. The flame-retardant elastomer is an active hydrogen-containing flame retardant, a non-halogen phosphate ester, a halogen-containing phosphate ester, a metal oxide, a metal hydroxide, a halogen-based flame retardant,
1 selected from melamine, melamine derivatives and red phosphorus
3. A flame retardant of one or more types is used.
The consolidation method described. 4. The consolidation method according to any one of claims 1 to 3, wherein the base resin and the curing agent do not contain a solvent that does not chemically contribute to the curing reaction. 5. The consolidation method according to claim 1, wherein the two-component curing type urethane elastomer is a foam, and the expansion ratio after curing is 1.1 to 10 times.