Decomposition agent composition for asphalt emulsion and use of the same

Abstract

To provide a decomposition agent composition for asphalt emulsion that exhibits excellent decomposition properties for the asphalt emulsion, and is also excellent in stability, and enables uniform spraying.SOLUTION: (A decomposition agent composition for asphalt emulsion of the first aspect) A decomposition agent composition for asphalt emulsion comprising anionic surfactant (A) in which forming properties with effective concentration of 0.5 wt.% at 25°C by the Ross-Miles method is 40 nm or less immediately after falling. (A decomposition agent composition for asphalt emulsion of the second aspect) A decomposition agent composition for asphalt emulsion comprising anionic surfactant (A) and water in which light transmittance of wavelength of 670 nm at 25°C is 60% or more.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a decomposer composition for asphalt emulsion and its use. [Background technology]

[0002] Asphalt is the final refined product obtained after petroleum distillation to extract naphtha, gasoline, kerosene, diesel, etc., and has long been used as a paving material. Asphalt is a highly viscous semi-solid or solid at room temperature, and its high adhesiveness makes it very difficult to handle. As one method for improving the workability during handling at room temperature, the use of asphalt in a form emulsified in water using an emulsifier is known, and such emulsion is called asphalt emulsion. One method of classifying asphalt emulsions is to classify them as cationic, anionic, nonionic, etc. depending on the emulsifier used, and the majority of asphalt emulsions used for road paving are cationic asphalt emulsions.

[0003] Required properties of asphalt emulsion include storage stability from the time of its production until its use at the construction site, and mechanical stability so that the emulsion does not break down even when external forces such as shear and compression are applied by pumps used for transporting and spraying the emulsion. Furthermore, it is strongly desired that the asphalt emulsion separates into water and asphalt in a short time after being sprayed at the construction site. This is because if moisture remains in the asphalt, it will not achieve its inherent adhesiveness and will result in poor adhesion; however, after spraying asphalt emulsion, it is generally necessary to wait until the water in the agent has evaporated and fully decomposed, during which time traffic on the road must be restricted, resulting in a long time before the road can be reopened to traffic.

[0004] In order to solve such problems, a method of using a decomposer that breaks down the emulsion of the asphalt emulsion is known, and specific decomposers for cationic asphalt emulsions are proposed in Patent Documents 1 and 2. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-122352 A [Patent Document 2] JP 2016-164345 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the decomposition properties of the decomposing agents disclosed in Patent Documents 1 and 2 for asphalt emulsions are not sufficient. In addition, it is desirable for the decomposer to be water-based in order to ensure the safety of workers and reduce the impact on the surrounding environment after construction. However, if a large amount of salts such as inorganic sulfates or condensed phosphates are mixed, the stability of the decomposer itself decreases, and phase separation and solid precipitation occur. If such phase separation or solid precipitation occurs when spraying the decomposer, it will not be possible to spray uniformly, resulting in uneven spraying, or problems such as solids clogging the pipes, which will not only prevent the asphalt emulsion from being fully decomposed, but will also cause equipment failure. Furthermore, the incorporation of an anionic surfactant increases foaming properties, which can lead to air bubbles during spraying, causing uneven application of the product, and air bubbles remaining on the road surface after spraying can inhibit contact between the asphalt emulsion and the decomposer.

[0007] An object of the present invention is to provide an asphalt emulsion decomposer composition which exhibits excellent decomposition ability for asphalt emulsion, is also excellent in stability, and enables uniform spraying. [Means for solving the problem]

[0008] As a result of intensive research, the present inventors have found that the above problems can be solved by a decomposing agent composition for asphalt emulsion that contains specific components and exhibits specific physical properties, and have arrived at the present invention.

[0009] That is, the asphalt emulsion decomposer composition of the first aspect of the present invention is an asphalt emulsion decomposer composition containing an anionic surfactant (A), and the foaming power at an effective concentration of 0.5% by weight at 25°C as measured by the Ross Miles test method is 40 mm or less immediately after flowing.

[0010] It is preferable that the decomposing agent composition for the first asphalt emulsion of the present invention satisfies at least one of the following 1) to 7). 1) The foaming power of an effective concentration of 0.5% by weight at 25°C according to the Ross Miles test is 20 mm or less 5 minutes after pouring. 2) It contains at least one of a water-soluble inorganic compound (B) and an organic compound (C) having a solubility in water at a temperature of 20°C of 20 g / 100 g or less. 3) The compound (B) includes at least one of a sulfate and a phosphate. 4) The compound (C) has a hydrocarbon group having 1 to 22 carbon atoms. 5) The compound (C) has at least one of an oxyalkylene group and a hydroxy group. 6) The compound (A) contains an anionic surfactant (a1) containing a sulfur atom. 7) The viscosity at 25°C is 0.1 to 500 mPa s.

[0011] The asphalt emulsion decomposer composition of the second aspect of the present invention is a composition for decomposing an asphalt emulsion that contains an anionic surfactant (A) and water, and has a light transmittance at a wavelength of 670 nm at 25°C of 60% or more.

[0012] It is preferable that the decomposing agent composition of the second asphalt emulsion of the present invention satisfies at least one of the following 8) to 13). 8) It contains at least one of a water-soluble inorganic compound (B) and an organic compound (C) having a solubility in water at a temperature of 20°C of 20 g / 100 g or less. 9) The compound (B) includes at least one of a sulfate and a phosphate. 10) The compound (C) has a hydrocarbon group having 1 to 22 carbon atoms. 11) The compound (C) has at least one of an oxyalkylene group and a hydroxy group. 12) The compound (A) contains an anionic surfactant (a1) containing a sulfur atom. 13) The viscosity at 25°C is 0.1 to 500 mPa s.

[0013] The method for applying an asphalt pavement of the present invention includes the step of contacting the asphalt emulsion with the asphalt emulsion decomposer composition. Effect of the Invention

[0014] The asphalt emulsion decomposer composition of the present invention exhibits excellent decomposition properties for asphalt emulsions, and further has excellent stability and can be uniformly dispersed. The asphalt pavement application method of the present invention uses the above-mentioned asphalt emulsion decomposer composition, so that asphalt pavement can be applied efficiently. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The asphalt emulsion decomposer composition of the first embodiment of the present invention contains an anionic surfactant (A), and has a foaming power of 40 mm or less at an effective concentration of 0.5% by weight at 25°C according to the Ross Miles test method immediately after flowing down. Hereinafter, the asphalt emulsion decomposer composition may be referred to as a decomposer composition.

[0016] The decomposer composition of the first aspect of the present invention has a foaming power of 40 mm or less at an effective concentration of 0.5% by weight at 25°C according to the Ross Miles test immediately after flowing. If the foaming power exceeds 40 mm, the amount and strength of the foam generated increases, and air bubbles are introduced during spraying, causing unevenness in the amount of the decomposer composition sprayed, or air bubbles remain on the road surface after spraying, hindering contact between the asphalt emulsion and the decomposer composition, causing unevenness in the decomposition of the emulsion, resulting in a long time until the entire sprayed surface is decomposed. The foaming power is preferably 30 mm or less, more preferably 20 mm or less, even more preferably 15 mm or less, and particularly preferably 10 mm or less. The lower limit of the foaming power is preferably 0 mm. In addition, if the foaming power is 0 mm, it is preferable in that the effect of the present application is more effectively achieved.

[0017] The decomposer composition of the first aspect of the present invention is not particularly limited, but preferably has a foaming power of 20 mm or less at an effective concentration of 0.5% by weight at 25°C as measured by the Ross Miles test immediately after pouring and 5 minutes later. If the foaming power is 20 mm or less, there is a tendency for unevenness in spraying to be reduced. The foaming power is more preferably 15 mm or less, even more preferably 10 mm or less, and particularly preferably 5 mm or less. The lower limit of the foaming power is preferably 0 mm. In addition, if the foaming power is 0 mm, it is preferable in that the spraying can be performed uniformly.

[0018] The decomposing agent composition of the second embodiment of the present invention contains an anionic surfactant (A) and water, and has a light transmittance of 60% or more at a wavelength of 670 nm at 25° C. If the light transmittance is less than 60%, phase separation and solid precipitation occur over time, making uniform spraying difficult. The light transmittance is preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more. The upper limit of the light transmittance is preferably 100%. The light transmittance of the decomposition composition at a wavelength of 670 nm at 25° C. is measured by the method described in the Examples.

[0019] The specific gravity of the decomposing agent composition of the present invention at 20°C is not particularly limited, but is preferably 0.90 to 1.30. If the specific gravity is 0.90 or more, the permeability of the decomposing agent composition into the asphalt emulsion tends to improve, and if the specific gravity is 1.30 or less, the oil droplets of the asphalt emulsion tend to be destroyed and the coalescence of the asphalt tends to be promoted. The lower limit of the specific gravity is more preferably 0.95, and even more preferably 1.00. On the other hand, the upper limit of the specific gravity is more preferably 1.25, even more preferably 1.20, and particularly preferably 1.15. The specific gravity of the decomposition composition of the present invention at 20° C. is measured by the method described in the Examples. The decomposing agent composition of the present invention means at least one of the decomposing agent compositions of the first embodiment and the second embodiment.

[0020] The viscosity of the decomposing agent composition of the present invention at 20°C is not particularly limited, but is preferably 0.1 to 500 mPa·s. If the viscosity is within the above range, it can be sprayed more uniformly over a wider area, and furthermore, after spraying, it tends to be easily mixed with the asphalt emulsion, and the permeability of the decomposing agent composition into the asphalt emulsion tends to be improved. The viscosity is more preferably 0.1 to 400 mPa·s, even more preferably 0.1 to 300 mPa·s, and particularly preferably 0.1 to 200 mPa·s. The viscosity of the decomposing agent composition of the present invention at 20° C. is measured by the method described in the Examples.

[0021] The surface tension of the decomposer composition of the present invention at an effective concentration of 0.5% by weight at 25°C is not particularly limited, but is preferably 0.1 to 55 mN / m. If the surface tension is within the above range, the permeability of the decomposer composition into the asphalt emulsion tends to be improved, and further, uneven decomposition caused by uneven spraying tends to be reduced. The surface tension is more preferably 0.1 to 50 mN / m, even more preferably 0.1 to 45 mN / m, and particularly preferably 0.1 to 40 mN / m. The surface tension of the decomposition composition at an effective concentration of 0.5% by weight at 25° C. can be measured by, for example, the Wilhelmy plate method.

[0022] The decomposer compositions of the first and second embodiments of the present invention contain an anionic surfactant (A) (hereinafter, sometimes referred to as surfactant (A)) as described above. The surfactant (A) is a component that neutralizes the electric charge of the cationic emulsifier present on the oil droplet surfaces of the asphalt emulsion, and because the hydrophobic group portion has an affinity for the asphalt emulsion, it breaks down the oil droplets and promotes the coalescence of the asphalt.

[0023] The surfactant (A) is not particularly limited, and examples thereof include fatty acid salts, alkyl sulfates, polyoxyalkylene alkyl sulfates, acyl N-methyl amino acid salts, acyl amino acid salts, polyoxyalkylene alkyl ether acetates, fatty acid alkanolamide ether carboxylates, acyl lactates, polyoxyalkylene alkylamine sulfates, fatty acid alkanolamide sulfates, fatty acid glyceride sulfates, alkylbenzene polyoxyalkylene sulfates, salts of sulfated oils and fats, olefin sulfonates, alkyl sulfosuccinates, polyoxyalkylene alkyl ether sulfosuccinates, alkylbenzene sulfonates, alkylnaphthalene sulfonates, alkanesulfonates, α-sulfo fatty acid methyl ester salts, acyl isethionates, alkyl glycidyl ether sulfonates, alkyl sulfoacetates, polyoxyalkylene alkyl ether phosphates, alkyl phosphates, polyoxyalkylene alkyl aryl ether phosphates, alkylaryl phosphates, fatty acid amide phosphates, phospholipids, and silicone-based anionic surfactants, and the like. One or more of these may be used in combination. The salt is not particularly limited, but examples thereof include metal salts such as sodium and potassium salts; alkanolamine salts such as monoethanolamine salts, diethanolamine salts, and triethanolamine salts; and ammonium salts. The surfactant (A) may be composed of one type of these salts or two or more types of them.

[0024] The number of carbon atoms in the hydrocarbon group of the surfactant (A) is not particularly limited, but from the viewpoint of affinity with the asphalt emulsion, it is preferably 4 to 30. The lower limit of the carbon number is more preferably 6, and even more preferably 8. On the other hand, the upper limit of the carbon number is more preferably 22, and even more preferably 18. The hydrocarbon group of the surfactant (A) may be either a straight-chain type or a branched type, or may be composed of both types. The hydrocarbon group may also have a cyclic structure such as an aromatic ring structure or an alicyclic structure. The hydrocarbon group contained in the surfactant (A) may be either a saturated hydrocarbon group or an unsaturated hydrocarbon group, or may be composed of both of these groups.

[0025] When the surfactant (A) has an oxyalkylene group in the molecule, the number of carbon atoms in the oxyalkylene group is not particularly limited, but is preferably 2 to 4. When the surfactant (A) has an oxyalkylene group in the molecule, the number of moles of the oxyalkylene group added is not particularly limited, but is preferably 1-30. The average number of moles of oxyalkylene groups added in the surfactant (A) is not particularly limited, but is preferably 1-30.

[0026] The surfactant (A) is not particularly limited, but it is preferable that the surfactant (A) contains an anionic surfactant (a1) containing a sulfur atom (hereinafter, sometimes referred to as surfactant (a1)) in that the affinity with the asphalt emulsion is improved. The surfactant (a1) is not particularly limited, and examples thereof include alkyl sulfates, polyoxyalkylene alkyl ether sulfates, alkyl phenyl sulfates, polyoxyalkylene alkyl phenyl ether sulfates, polyoxyalkylene fatty amine sulfates, fatty acid alkanolamide sulfates, fatty acid glyceride sulfates, olefin sulfonates, alkyl sulfosuccinates, polyoxyalkylene alkyl ether sulfosuccinates, alkylamide sulfosuccinates, alkyl benzene sulfonates, alkoxy benzene sulfonates, naphthalene sulfonates, alkyl naphthalene sulfonates, naphthalene sulfonate-formaldehyde condensate salts, melamine sulfonates, melamine sulfonate-formaldehyde condensate salts, alkanesulfonates, α-sulfo fatty acid methyl ester salts, acyl isethionates, alkyl glycidyl ether sulfonates, salts of sulfated oils and fats, salts of sulfated hardened oils and fats, and salts of sulfated unsaturated fatty acid esters. One or more of these may be used in combination. The surfactant (a1) is not particularly limited, but in terms of achieving the effects of the present invention, it is preferable for the surfactant to include an anionic surfactant containing an aromatic sulfur atom.

[0027] When the surfactant (A) contains the surfactant (a1), the weight ratio of the surfactant (a1) in the surfactant (A) is not particularly limited, but is preferably 30 to 100% by weight. If the weight ratio is 30% by weight or more, the decomposition property of the asphalt emulsion tends to improve. The weight ratio is more preferably 35 to 100% by weight, even more preferably 40 to 100% by weight, and particularly preferably 50 to 100% by weight.

[0028] The decomposition agent composition of the present invention may contain at least one of a water-soluble inorganic compound (B) (hereinafter, sometimes referred to as compound (B)) and an organic compound (C) (hereinafter, sometimes referred to as compound (C)) having a solubility in water of 20 g / 100 g or less at a temperature of 20° C.

[0029] The decomposition agent composition of the present invention is preferably one that contains the compound (B) in that it improves the permeability of the decomposition agent composition into the inside of the asphalt emulsion, reduces the amount of undecomposed emulsion, and efficiently promotes the coalescence of asphalt. When the decomposition agent composition of the present invention contains the compound (C), it is believed to function as a compatibilizer between the asphalt and the surfactant (A), which is preferable in that it reduces the function of the emulsifier in the asphalt emulsion, promotes the destruction of oil droplets, and promotes the coalescence of the asphalt.

[0030] In particular, when the compound (C) is contained, it is considered that the compound (C) has an effect of reducing bubbles in the decomposer composition by adsorbing to the interface of bubbles generated together with the surfactant (A) and destroying the foam film, and it is preferable because it makes it easier to obtain a decomposer composition having a specific foaming power.

[0031] The compound (B) preferably has a solubility in water of 1 g / 100 g or more at 20° C., more preferably 5 g / 100 g or more, and further preferably 10 g / 100 g or more. When the solubility in water at 20° C. of the compound (B) is within the above range, the stability of the decomposition agent composition tends to be improved.

[0032] Examples of the compound (B) include carbonates, sulfates, nitrates, phosphates, hydrochlorides, etc., and these may be used alone or in combination of two or more kinds. The carbonate is not particularly limited, but examples thereof include sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, lithium carbonate, and lithium hydrogen carbonate. The sulfate is not particularly limited, but examples thereof include sodium sulfate, potassium sulfate, magnesium sulfate, calcium sulfate, aluminum sulfate, iron sulfate, cobalt sulfate, nickel sulfate, copper sulfate, zinc sulfate, silver sulfate, zirconyl sulfate, ammonium sulfate, ammonium iron sulfate, aluminum ammonium sulfate, aluminum potassium sulfate, sodium sulfite, sodium hydrogensulfite, sodium thiosulfate, potassium thiosulfate, magnesium thiosulfate, and ammonium thiosulfate.

[0033] The nitrate is not particularly limited, but examples thereof include sodium nitrate, potassium nitrate, and aluminum nitrate. The phosphate is not particularly limited, but examples include sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, potassium phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, sodium pyrophosphate, potassium pyrophosphate, copper pyrophosphate, tin pyrophosphate, disodium dihydrogen pyrophosphate, calcium hydrogen pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium tetrapolyphosphate, sodium hexametaphosphate, potassium metaphosphate, and the like. The hydrochloride is not particularly limited, but examples thereof include sodium chloride, potassium chloride, magnesium chloride, calcium chloride, aluminum chloride, iron chloride, and ammonium chloride.

[0034] The compound (B) is not particularly limited, but it is preferable that the compound (B) contains at least one of a sulfate and a phosphate, since this improves the affinity with the asphalt emulsion. When compound (B) contains at least one of sulfate and phosphate, the total weight percentage of sulfate and phosphate in compound (B) is not particularly limited, but is preferably 40 to 100% by weight, more preferably 50 to 100% by weight, further preferably 60 to 100% by weight, and particularly preferably 70 to 100% by weight. When compound (B) contains sulfate or phosphate, the weight percentage of each is preferably within the above numerical range.

[0035] The compound (C) is an organic compound having a solubility in water of 20 g / 100 g or less at a temperature of 20° C. The compound (C) excludes anionic surfactants. The solubility of compound (C) in water at 20° C. is more preferably 15 g / 100 g or less, and further preferably 10 g / 100 g or less. The lower limit of the solubility of compound (C) in water at 20° C. is 0 g / 100 g. Moreover, the compound (C) may be in a solid state or in a liquid state at 20° C. When the compound (C) is in a liquid state at 20° C., it is preferable in terms of achieving the effects of the present invention.

[0036] Compound (C) may have a hydrocarbon group having 1 to 22 carbon atoms. Compound (C) having such a hydrocarbon is preferable in that it improves the affinity with the asphalt emulsion. The number of carbon atoms in the hydrocarbon group is more preferably 1 to 20, further preferably 1 to 18, and particularly preferably 1 to 12. The hydrocarbon group is not particularly limited, but examples thereof include an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aryl group, an allyl group, and a vinyl group. When compound (C) has the above-mentioned hydrocarbon group, the hydrocarbon group may be linear or branched, and may have a cyclic structure such as an aromatic ring structure or an alicyclic structure. The hydrocarbon group contained in the compound (C) may be either a saturated hydrocarbon group or an unsaturated hydrocarbon group, or may be composed of these two types.

[0037] The compound (C) may have at least one of an oxyalkylene group and a hydroxyl group. When the compound (C) has the above group, it is preferable because the affinity with the surfactant (A) is improved. When the compound (C) has an oxyalkylene group, the number of carbon atoms in the oxyalkylene group is not particularly limited, but is preferably 2-4, and more preferably 2-3. When compound (C) has an oxyalkylene group, the number of moles of the oxyalkylene group added is not particularly limited, but is preferably 1 to 50, more preferably 1 to 40, further preferably 1 to 30, and particularly preferably 1 to 20. The average number of moles of oxyalkylene groups added in compound (C) is not particularly limited, but is preferably 1-50, more preferably 1-40, further preferably 1-30, and particularly preferably 1-20. When the compound (C) has oxyalkylene groups having different numbers of carbon atoms, the oxyalkylene groups may be added randomly or in a block form.

[0038] When compound (C) has a hydroxy group, the number of hydroxy groups contained therein is not particularly limited, but is preferably 1-10, further preferably 1-6, even more preferably 1-4, and particularly preferably 1-3.

[0039] The compound (C) is not particularly limited as long as it has a solubility in water of 20 g / 100 g or less at a temperature of 20° C., and examples thereof include polyoxyalkylene alkyl ethers such as polyoxyalkylene methyl ether, polyoxyalkylene ethyl ether, polyoxyalkylene propyl ether, polyoxyalkylene butyl ether, polyoxyalkylene hexyl ether, polyoxyalkylene octyl ether, polyoxyalkylene lauryl ether, polyoxyalkylene myristyl ether, polyoxyalkylene oleyl ether, polyoxyalkylene stearyl ether, polyoxyalkylene benzyl ether, polyoxyalkylene dibutyl ether, polyoxyalkylene dihexyl ether, polyoxyalkylene dioctyl ether, polyoxyalkylene dilauryl ether, polyoxyalkylene dioleyl ether, and polyoxyalkylene distearyl ether; polyoxyalkylene phenyl ether, polyoxyalkylene alkyl phenyl ether, and polyoxyalkylene dialkyl phenyl ether; polyoxyalkylene aryl ethers such as polyoxyalkylene styrenated phenyl ether, polyoxyalkylene distyrenated phenyl ether, and polyoxyalkylene tristyrenated phenyl ether; polyoxyalkylene glycols such as polypropylene glycol and polyoxyethylene polyoxypropylene glycol, polyoxyalkylene glyceryl ether, polyoxyalkylene trimethylolpropane, polyoxyalkylene pentaerythritol, and 2,2-bis(4-polyoxyalkyleneoxyphenyl)propane; fatty acid esters such as polyoxyalkylene fatty acid esters, polyoxyalkylene fatty acid diesters, polyoxyalkylene glyceryl ether fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, glycerin fatty acid esters, and sorbitan fatty acid esters; alcohols such as butyl alcohol, octyl alcohol, lauryl alcohol, oleyl alcohol, stearyl alcohol, and pentaerythritol;Examples of the phenol include phenols such as phenol, alkylphenols, alkoxyphenols, styrenated phenol, distyrenated phenol, tristyrenated phenol, and 2,2-bis(4-hydroxyphenyl)propane; amines such as alkylamines, polyoxyalkylene alkylamines, and polyoxyalkylene ethylene diamines; and fatty acid amides such as fatty acid amides and polyoxyalkylene fatty acid amides, and these may be used alone or in combination of two or more kinds.

[0040] The compound (C) is not particularly limited, but in terms of achieving the effects of the present application, it is preferably at least one selected from polyoxyalkylene polyols and organic compounds having at least one group selected from an oxyalkylene group and a hydroxy group and having a hydrocarbon group having a carbon number of 1 to 22. In addition, when the compound (C) is one of the above, it is preferable in that a decomposing agent composition having a specific foaming power and a decomposing agent composition having a specific light transmittance are easily obtained.

[0041] The molecular weight of the compound (C) is not particularly limited, but is preferably 3000 or less. When the molecular weight is 3000 or less, the stability of the decomposition agent composition is improved, and phase separation and solid precipitation tend to be more suppressed. The upper limit of the molecular weight is more preferably 2500 or less, even more preferably 2000 or less, particularly preferably 1500 or less, and most preferably 1000 or less. On the other hand, the lower limit of the molecular weight is 90. In addition, when the compound (C) has a repeating unit such as the oxyalkylene group in the molecule, the molecular weight is the weight average molecular weight. The weight average molecular weight of the compound (C) is measured by the method described in the Examples.

[0042] When the decomposer composition of the first aspect of the present invention contains at least one of the compounds (B) and (C), the total content of the compounds (B) and (C) is not particularly limited relative to 100 parts by weight of the surfactant (A), but is preferably 10 to 900 parts by weight. If the content is 10 parts by weight or more, there is a tendency to break down the oil droplets of the asphalt emulsion and promote the coalescence of the asphalt, and if it is 900 parts by weight or less, there is a tendency to improve the stability of the decomposer composition. In addition, if the content is within the above range, the decomposer composition is likely to have a specific foaming power. The upper limit of the content is more preferably 20 parts by weight, even more preferably 30 parts by weight, and particularly preferably 50 parts by weight. On the other hand, the upper limit of the content is more preferably 700 parts by weight, even more preferably 500 parts by weight, particularly preferably 400 parts by weight, and most preferably 300 parts by weight. In addition, in the decomposition agent composition of the first aspect of the present invention, when the compound (B) or the compound (C) is contained, the content of the compound (B) or the compound (C) relative to 100 parts by weight of the surfactant (A) is preferably in the above-mentioned numerical range.

[0043] When the decomposition composition of the first aspect of the present invention contains compound (B) and compound (C), the weight ratio (C / B) of compound (C) to compound (B) is not particularly limited, but is preferably 5 / 95 to 99 / 1. When the weight ratio is 5 / 95 or more, there is a tendency to break oil droplets in the asphalt emulsion and promote the coalescence of asphalt, and when the weight ratio is 99 / 1 or less, there is a tendency to improve the permeability of the decomposition composition into the inside of the asphalt emulsion. The lower limit of the weight ratio is more preferably 10 / 90, even more preferably 20 / 80, and particularly preferably 30 / 70. On the other hand, the upper limit of the weight ratio is more preferably 98 / 2, even more preferably 95 / 5, and particularly preferably 90 / 10.

[0044] When the decomposing agent composition of the second aspect of the present invention contains at least one of the compounds (B) and (C), the total content of the compounds (B) and (C) is not particularly limited relative to 100 parts by weight of the surfactant (A), but is preferably 10 to 900 parts by weight. If the content is 10 parts by weight or more, there is a tendency to break the oil droplets of the asphalt emulsion and promote the coalescence of the asphalt, and if it is 900 parts by weight or less, there is a tendency to improve the stability of the decomposing agent composition. In addition, if the content is within the above range, the decomposing agent composition is likely to have a specific light transmittance. The upper limit of the content is more preferably 20 parts by weight, even more preferably 30 parts by weight, and particularly preferably 50 parts by weight. On the other hand, the upper limit of the content is more preferably 700 parts by weight, even more preferably 500 parts by weight, particularly preferably 400 parts by weight, and most preferably 300 parts by weight. In addition, in the decomposition agent composition of the second aspect of the present invention, when the compound (B) or the compound (C) is contained, the content of the compound (B) or the compound (C) relative to 100 parts by weight of the surfactant (A) is preferably in the above-mentioned numerical range.

[0045] When the decomposing agent composition of the second aspect of the present invention contains compound (B) and compound (C), the weight ratio (C / B) of compound (C) to compound (B) is not particularly limited, but is preferably 5 / 95 to 99 / 1. When the weight ratio is 5 / 95 or more, there is a tendency to break oil droplets in the asphalt emulsion and promote the coalescence of asphalt, and when the weight ratio is 99 / 1 or less, there is a tendency to improve the permeability of the decomposing agent composition into the inside of the asphalt emulsion. The lower limit of the weight ratio is more preferably 10 / 90, even more preferably 20 / 80, and particularly preferably 30 / 70. On the other hand, the upper limit of the weight ratio is more preferably 98 / 2, even more preferably 95 / 5, and particularly preferably 90 / 10.

[0046] The decomposing agent composition according to the first embodiment of the present invention may contain water, and may be in the form of an aqueous solution or a dispersion in water. When the decomposer composition of the first aspect of the present invention contains water, the content of water is not particularly limited, but is preferably 50 to 4000 parts by weight relative to 100 parts by weight of the surfactant (A). If the content is 50 parts by weight or more, the stability of the decomposer composition tends to improve, and if it is 4000 parts by weight or less, the oil droplets of the asphalt emulsion tend to be destroyed and the coalescence of the asphalt tends to be promoted. The lower limit of the content is more preferably 75 parts by weight, and even more preferably 100 parts by weight. On the other hand, the upper limit of the content is more preferably 3000 parts by weight, and even more preferably 2000 parts by weight.

[0047] The weight ratio of water in the decomposing agent composition of the first embodiment of the present invention is not particularly limited, but is preferably 20 to 90% by weight. When the weight ratio is 20% by weight or more, the stability of the decomposing agent composition tends to be improved, and when the weight ratio is 90% by weight or less, the oil droplets of the asphalt emulsion tend to be broken down and the coalescence of the asphalt tends to be promoted. The lower limit of the weight ratio is more preferably 30% by weight, even more preferably 40% by weight, and particularly preferably 50% by weight. On the other hand, the upper limit of the weight ratio is more preferably 85% by weight, even more preferably 80% by weight, and particularly preferably 75% by weight. The weight ratio of water in the decomposition agent composition is determined by the method described in the Examples.

[0048] The decomposing agent composition according to the second embodiment of the present invention contains water. The decomposing agent composition according to the second embodiment of the present invention may be an aqueous solution or may be dispersed in water. Furthermore, by containing water, the dispersant composition according to the second aspect of the present invention can have a specific light transmittance.

[0049] The content of water in the decomposer composition of the second aspect of the present invention is not particularly limited, but is preferably 50 to 4000 parts by weight relative to 100 parts by weight of the surfactant (A). If the content is 50 parts by weight or more, the stability of the decomposer composition tends to improve, and if it is 4000 parts by weight or less, the oil droplets of the asphalt emulsion tend to be destroyed and the coalescence of the asphalt tends to be promoted. The lower limit of the content is more preferably 75 parts by weight, and even more preferably 100 parts by weight. On the other hand, the upper limit of the content is more preferably 3000 parts by weight, and even more preferably 2000 parts by weight.

[0050] The weight ratio of water in the decomposing agent composition of the second aspect of the present invention is not particularly limited, but is preferably 20 to 90% by weight. When the weight ratio is 20% by weight or more, the stability of the decomposing agent composition tends to be improved, and when the weight ratio is 90% by weight or less, the oil droplets of the asphalt emulsion tend to be destroyed and the coalescence of the asphalt tends to be promoted. The lower limit of the weight ratio is more preferably 30% by weight, even more preferably 40% by weight, and particularly preferably 50% by weight. On the other hand, the upper limit of the weight ratio is more preferably 85% by weight, even more preferably 80% by weight, and particularly preferably 75% by weight.

[0051] [Other ingredients] The decomposer composition of the present invention may contain other components such as a water-soluble solvent, a surfactant other than an anionic surfactant, a defoamer, and a tack inhibitor, in addition to the above components. The water-soluble solvent has a solubility in water at 20° C. of more than 20 g / 100 g, and is not particularly limited. Examples of the water-soluble solvent include methanol, ethanol, propanol, ethylene glycol, diethylene glycol, propylene glycol, 2-ethoxyethanol, 2-(2-ethoxyethoxy)ethanol, 2-butoxyethanol, 2-(2-butoxyethoxy)ethanol, 3-methoxy-3-methyl-1-butanol, dimethylformamide, and dimethyl sulfoxide, and one or more of these may be used in combination.

[0052] The surfactant other than the anionic surfactant is not particularly limited, but examples thereof include cationic surfactants, amphoteric surfactants, and nonionic surfactants having a solubility in water at 20° C. of more than 20 g / 100 g, and one or more of these may be used in combination. The defoaming agent is not particularly limited, but examples thereof include ester-based defoaming agents, polyether-based defoaming agents, mineral oil-based defoaming agents, silicone-based defoaming agents, powder defoaming agents, and the like, and one or more of these may be used in combination.

[0053] The decomposing agent composition of the first aspect of the present invention contains the anionic surfactant (A) as described above, exhibits specific foaming properties, exhibits excellent decomposition properties for asphalt emulsions, and further has excellent stability and can be sprayed uniformly. The decomposition agent composition of the second aspect of the present invention contains the anionic surfactant (A) and water as described above, exhibits a specific light transmittance, exhibits excellent decomposition ability for asphalt emulsions, and further has excellent stability and can be uniformly sprayed. The decomposer compositions of the first and second aspects of the present invention are particularly capable of decomposing cationic asphalt emulsions, such as the cationic asphalt emulsion "PK-4" specified in JIS-K2208 or "PKM-T" and "PKM-TQ" specified in the Japan Asphalt Emulsion Association standard JEAAS.

[0054] The method for producing the decomposing agent composition of the present invention is not particularly limited, and examples thereof include a method of mixing the surfactant (A) with, if necessary, the compound (B) or compound (C) and other components, or a method of preparing a mixed liquid in which the surfactant (A) is dissolved or dispersed in water at a high concentration in advance, and adding, if necessary, the compound (B) or compound (C) and other components to the prepared mixed liquid and mixing them, etc. In the method for producing the decomposing agent composition, the order of mixing, etc. is not particularly limited, and all the components may be mixed at the same time, or may be mixed in order, or some components may be mixed in advance, and the remaining components or mixtures thereof may be added to the obtained mixture, mixed, dispersed, or dissolved. There are no particular limitations on the mixing method, and the device used is equipped with a very simple mechanism such as a container and agitating blades. This can be done using:

[0055] The method for applying an asphalt pavement of the present invention includes the step of contacting the asphalt emulsion with the asphalt emulsion decomposer composition. The decomposing agent composition may be sprayed simultaneously with the asphalt emulsion to bring the decomposing agent composition into contact with the asphalt emulsion, or the decomposing agent composition may be sprayed on top of the asphalt emulsion after it has been sprayed to bring the decomposing agent composition into contact with the asphalt emulsion. The decomposing agent composition and the asphalt emulsion may be heated before spraying.

[0056] Asphalt emulsions are sprayed onto roadbeds, base layers, and surface layers, and are also used for spray-on waterproofing of slopes, walls, etc., and the decomposition agent composition has excellent decomposability and can therefore also be used for these purposes. When spraying the decomposition composition, it is preferable to spray it in the form of a mist in order to make it uniform. For small-scale paving, an engine sprayer, gear sprayer, air sprayer, hand sprayer, airless pump sprayer, etc. may be used, and for large-scale paving, a device for spraying asphalt emulsion, such as an asphalt sprayer, asphalt distributor, or asphalt finisher with an emulsion spraying function, may be used. The amount of the decomposition agent composition to be sprayed is not particularly limited, but is preferably 10 parts by weight or more based on 100 parts by weight of the asphalt emulsion. EXAMPLES

[0057] The present invention will be specifically described below with reference to examples and comparative examples. The present invention is not limited to these examples. In the following examples and comparative examples, "%" means "% by weight" and "parts" means "parts by weight" unless otherwise specified. In the following, the decomposer composition of the asphalt emulsion may be referred to as the "decomposer composition" and the solubility in water at 20°C may be referred to as the "solubility". The physical properties and performance of the decomposition agent compositions in the following Examples and Comparative Examples were evaluated by the methods described below.

[0058] [Preparation of decomposition composition] The decomposing agent compositions of Examples 1 to 22 and Comparative Examples 1 to 7 were produced so as to have the weight ratios shown in Tables 1 and 2. The physical properties of the produced decomposing agent compositions were measured. The results are shown in Tables 1 and 2. In addition, a decomposition test of asphalt emulsion using the prepared decomposition composition was carried out. The results are shown in Table 3.

[0059] [Method of measuring weight average molecular weight] The weight average molecular weight of the compound (C) was measured by gel permeation chromatography (GPC). Compound (C) was dissolved in tetrahydrofuran so that the concentration was about 0.2% by weight to prepare an eluent. Using the prepared eluent, the weight average molecular weight of compound (C) was measured under the following conditions. Polyethylene glycol with a known molecular weight was used to create a calibration curve. Device name: HLC-8220 (Tosoh Corporation) Column: KF-G, KF-402HQ, and KF-403HQ connected in series (all manufactured by Shodex) Eluent: Tetrahydrofuran Injection volume: 10μL Eluent flow rate: 0.3mL / min Temperature: 40℃

[0060] [Measurement of weight percentage of water] The weight proportion of water in the decomposition agent composition was measured by volumetric titration in accordance with JIS K0068 using the following Karl Fischer titrator as a measuring instrument. Karl Fischer titrator: Kyoto Electronics MKA-510N In the present invention, the effective concentration of the decomposition agent composition refers to the weight ratio excluding the weight ratio of water measured by the above method from the total weight of the decomposition agent composition.

[0061] [Method of measuring specific gravity] The specific gravity of the decomposition composition at a temperature of 20° C. was measured using the following density / specific gravity meter as a measuring instrument in accordance with the method of JIS Z8804-9. Density and specific gravity meter: Kyoto Electronics Manufacturing Co., Ltd. DA-200

[0062] [Method of measuring viscosity] The viscosity of the decomposing agent composition at a temperature of 20° C. was measured using a Brookfield viscometer.

[0063] [Measurement of foaming power] The foaming power of the decomposition composition at an effective concentration of 0.5% by weight was measured under measurement conditions at a temperature of 25° C. by the Ross Miles test method in accordance with JIS K3362. Specifically, a water mixture containing a decomposition composition with an effective concentration of 0.5% by weight was used as the test liquid, and 50 ml of the test liquid was poured along the tube wall of the Ross Miles measuring device, and 200 ml of the test liquid was also poured into the upper flow pipette to prepare the test liquid. The pipette was set so that droplets of the test liquid would fall into the center of the cylinder of the Ross Miles measuring device, and the test liquid was allowed to flow down from a height of 90 cm, and the foam height immediately after the flow had finished (immediately after the flow) and 5 minutes after the flow had ended were measured.

[0064] [Measurement of light transmittance] The light transmittance of the decomposition agent composition at a wavelength of 670 nm at 25° C. was measured using the following measurement cell and the following spectrophotometer. Spectrophotometer: Shimadzu UV-1800 Measurement cell: 10mm thick, made of glass

[0065] [Method of measuring stability] The decomposition composition was placed in a glass container, which was then sealed and allowed to stand in thermostatic chambers at 5° C., 20° C. and 40° C. for 12 hours, and the state of the decomposition composition was visually observed. ○ Uniform transparency × Phase separation or solids settling

[0066] [Asphalt emulsion decomposition test] On a slate board measuring 150 mm in length, 150 mm in width and 3 mm in thickness, 0.4 L / m of cationic asphalt emulsion PK-4 was applied. 2 The test substrate was then cured for at least 4 hours in thermostatic chambers at 5°C and 20°C, and the cationic asphalt emulsion and decomposer composition were cured for at least 4 hours in a thermostatic chamber at 20°C. 0.4 L / m of cationic asphalt emulsion PK-4 was applied to the test substrate cured at each temperature. 2 Then, immediately after spraying the decomposition composition at 10 wt% of the asphalt emulsion amount from above, the sample was returned to the thermostatic chambers at 5°C and 20°C and allowed to stand. The state of decomposition of the emulsion was observed 1 minute, 3 minutes, 5 minutes, and 10 minutes after spraying the decomposition composition. ○ Asphalt is coated and decomposed down to the lower layer △1 The surface is decomposed and a film is formed, but the lower layer contains undecomposed emulsion. △2 Decomposition occurred down to the bottom layer, but no film formed, and the aggregates settled. △3: The part where the emulsion has decomposed to the lower layer and formed a film is mixed with the part where the emulsion remains or the aggregates have settled. × Asphalt does not form a film, and undecomposed emulsion remains If the asphalt emulsion decomposed to the lower layer within 10 minutes and formed a film, it was considered to have passed; if the asphalt emulsion remained without decomposing even after 10 minutes, or if the separated asphalt did not form a film, it was considered to have failed.

[0067] The molecular weights and solubilities (g / 100 g) in 100 g of water at 20° C. of the compounds shown in Tables 1 and 2 are as follows. POP(1) butyl ether Molecular weight: 132, solubility: 6.8 POE(3)POP(5)Butyl Ether Weight average molecular weight: 497, solubility: 16.0 POE(1) Lauryl Ether Weight average molecular weight: 234, solubility: less than 0.1 POE(1) Phenyl Ether Molecular weight: 138, Solubility: 2.8 POP(3) phenyl ether Weight average molecular weight: 268, solubility: less than 0.1 Distyrenated phenol Molecular weight: 302, Solubility: less than 0.1 2,2-Bis(4-POP(2)oxyphenyl)propane Weight average molecular weight: 461, solubility: less than 0.1 POE(5)POP(35) Stearyl Ether Stearate Weight average molecular weight: 2924, solubility: less than 0.1 Polypropylene glycol 2000 Weight average molecular weight: 2000, solubility: less than 0.1 POE(15) Lauryl Ether Weight average molecular weight: 847, solubility: over 20 POE(20) Sorbitan monooleate Weight average molecular weight: 1309, solubility: over 20 Glycerin Molecular weight: 92, Solubility: over 20 Dimethyl sulfoxide Molecular weight: 78, Solubility: >20 In Tables 1 and 2, POE means polyoxyethylene, and POP means polyoxypropylene. The numbers in parentheses following POE or POP indicate the number of moles of oxyethylene or oxypropylene added. In addition, in Tables 1 and 2, Na means sodium, K means potassium, and Mg means magnesium.

[0068] [Table 1]

[0069] [Table 2]

[0070] [Table 3]

[0071] As can be seen from Tables 1 to 3, the decomposing compositions according to Examples 1 to 22 contain an anionic surfactant (A), and have foaming power of 40 mm or less at an effective concentration of 0.5% by weight at 25°C immediately after pouring down according to the Ross Miles test. Also, the decomposing compositions according to Examples 1 to 22 contain anionic surfactant (A) and water, and have a light transmittance of 60% or more at a wavelength of 670 nm at 25°C, and therefore the problem of the present application can be solved. On the other hand, in the cases where the anionic surfactant (A) is not included (Comparative Examples 1 to 4), where the foaming power at an effective concentration of 0.5% by weight at 25°C as measured by the Ross Miles test exceeds 40 mm immediately after pouring (Comparative Examples 5 to 7), and where the light transmittance at a wavelength of 670 nm at 25°C is less than 60% (Comparative Examples 5 to 7), the problem of the present application is not solved.

Claims

1. A composition for decomposing an asphalt emulsion comprising an anionic surfactant (A), A decomposer composition for asphalt emulsion, which has a foaming power of 40 mm or less at an effective concentration of 0.5% by weight at 25°C according to the Ross Miles test method immediately after flowing.

2. The asphalt emulsion decomposer composition according to claim 1, which has a foaming power of 20 mm or less at an effective concentration of 0.5% by weight at 25°C according to the Ross Miles test method 5 minutes after the flow.

3. A composition for decomposing an asphalt emulsion, comprising an anionic surfactant (A) and water, A decomposer composition for an asphalt emulsion, having a light transmittance of 60% or more at a wavelength of 670 nm at 25°C.

4. The asphalt emulsion decomposer composition according to any one of claims 1 to 3, comprising at least one of a water-soluble inorganic compound (B) and an organic compound (C) having a solubility in water of 20 g / 100 g or less at a temperature of 20°C.

5. The asphalt emulsion decomposer composition according to claim 4, wherein the compound (B) comprises at least one of a sulfate and a phosphate.

6. The decomposing agent composition for asphalt emulsion according to claim 4, wherein the compound (C) has a hydrocarbon group having 1 to 22 carbon atoms.

7. The asphalt emulsion decomposer composition according to claim 4, wherein the compound (C) has at least one group selected from the group consisting of an oxyalkylene group and a hydroxyl group.

8. The asphalt emulsion decomposer composition according to any one of claims 1 to 3, wherein the compound (A) comprises an anionic surfactant (a1) containing a sulfur atom.

9. The asphalt emulsion decomposer composition according to any one of claims 1 to 3, having a viscosity at 25°C of 0.1 to 500 mPa·s.

10. A method for applying asphalt pavement, comprising a step of contacting an asphalt emulsion with the asphalt emulsion decomposer composition according to any one of claims 1 to 3.

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