Decomposer composition for asphalt emulsion and use thereof

Abstract

To provide a decomposer composition for asphalt emulsion which exhibits excellent decomposability for asphalt emulsion, has excellent stability, and enables uniform spraying.SOLUTION: A decomposer composition for asphalt emulsion preferably contains the following components (A) and (B); a component (B) having at least one group selected from an oxyalkylene group and a hydroxyl group; a component (A): anionic surfactant; the component (B): an organic compound having a solubility in water of 20 g / 100 g or less at a temperature of 20°C.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 reduce the safety of workers and 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, making it more likely to undergo phase separation or solid precipitation. In addition, if phase separation or solid precipitation occurs in the decomposer during spraying, 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 may also cause equipment failure.

[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 extensive research, the present inventors have found that the above problems can be solved by a decomposing agent composition for asphalt emulsion containing specific components, and have arrived at the present invention. That is, the decomposer composition for an asphalt emulsion of the present invention contains the following components (A) and (B). Component (A): Anionic surfactant Component (B): An organic compound whose solubility in water at 20°C is 20 g / 100 g or less

[0009] It is preferable that the decomposing agent composition for an asphalt emulsion of the present invention satisfies at least one of the following 1) to 6). 1) The component (B) has at least one group selected from an oxyalkylene group and a hydroxyl group. 2) The component (B) has a hydrocarbon group having 1 to 22 carbon atoms. 3) The molecular weight of the component (B) is 3,000 or less. 4) The content of the component (B) is 1 to 700 parts by weight based on 100 parts by weight of the component (A). 5) The component (A) contains an anionic surfactant (a1) containing a sulfur atom. 6) Specific gravity at 20°C is 0.9 to 1.3.

[0010] 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

[0011] 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

[0012] The decomposer composition for asphalt emulsion of the present invention (hereinafter, sometimes simply referred to as the decomposer composition) contains the following components (A) and (B). Component (A): Anionic surfactant Component (B): An organic compound whose solubility in water at 20°C is 20 g / 100 g or less First, each component contained in the decomposing agent composition of the present invention will be explained, and then the decomposing agent composition will be described in detail.

[0013] [Component (A)] The decomposer composition of the present invention contains an anionic surfactant as component (A), which neutralizes the electric charge of the cationic emulsifier present on the surface of the oil droplets of the asphalt emulsion and promotes the coalescence of the asphalt by breaking down the oil droplets because the hydrophobic group portion has an affinity for the asphalt emulsion.

[0014] Examples of component (A) 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 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. Component (A) may be composed of one or more of these salts.

[0015] The number of carbon atoms in the hydrocarbon group of component (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 contained in component (A) 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 component (A) may be either a saturated hydrocarbon group or an unsaturated hydrocarbon group, or may be composed of both.

[0016] When component (A) has an oxyalkylene group in the molecule, the number of carbon atoms in the oxyalkylene group is not particularly limited, but is preferably 2-4. When component (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 component (A) is not particularly limited, but is preferably 1-30.

[0017] Component (A) is not particularly limited, but it is preferable for it to contain a sulfur atom-containing anionic surfactant (a1) (hereinafter sometimes simply referred to as component (a1)) in that it improves the affinity with the asphalt emulsion. The component (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-sulfofatty 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. Furthermore, the component (a1) is not particularly limited, but in terms of achieving the effects of the present invention, it is preferable for the component (a1) to contain an anionic surfactant containing an aromatic sulfur atom.

[0018] When component (A) contains component (a1), the weight ratio of component (a1) in component (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.

[0019] [Component (B)] The decomposer composition of the present invention contains component (B), an organic compound having a solubility in water of 20 g / 100 g or less at a temperature of 20° C. By containing component (B) having a predetermined hydrophobicity that exhibits the above-mentioned properties, the decomposer composition is thought to function as a compatibilizer between asphalt and component (A), reducing the function of the emulsifier in the asphalt emulsion to promote the destruction of oil droplets and enhance the effect of promoting the coalescence of asphalt, and further suppressing phase separation and solid precipitation in the decomposer composition, improving stability and making it possible to uniformly spray the decomposer composition. Component (B) excludes anionic surfactants.

[0020] The solubility of component (B) in water at 20° C. is 20 g / 100 g or less, preferably 15 g / 100 g or less, more preferably 10 g / 100 g or less. The lower limit of the solubility of component (B) in water at 20° C. is 0 g / 100 g. Furthermore, component (B) may be either solid or liquid at 20° C. Component (B) being liquid at 20° C. is preferred in terms of achieving the effects of the present invention.

[0021] Component (B) may have at least one group selected from an oxyalkylene group and a hydroxyl group. When component (B) has at least one of the above groups, it is preferable because the affinity with component (A) is improved. When component (B) 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 component (B) has an oxyalkylene group, the number of moles of the oxyalkylene group added is not particularly limited, but is preferably 1-50, more preferably 1-40, even more preferably 1-30, and particularly preferably 1-20. The average number of moles of oxyalkylene groups added in component (B) is not particularly limited, but is preferably 1-50, more preferably 1-40, further preferably 1-30, and particularly preferably 1-20. When component (B) has oxyalkylene groups having different numbers of carbon atoms, the oxyalkylene groups may be added randomly or in a block form.

[0022] When component (B) has hydroxyl groups, the number of hydroxyl groups contained is not particularly limited, but is preferably 1-10, more preferably 1-6, even more preferably 1-4, and particularly preferably 1-3.

[0023] Component (B) may have a hydrocarbon group having 1 to 22 carbon atoms. It is preferable that component (B) has such a hydrocarbon group in that it has improved affinity with the asphalt emulsion. The number of carbon atoms in the hydrocarbon group is more preferably 1 to 20, even more 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 component (B) 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 component (B) may be either a saturated hydrocarbon group or an unsaturated hydrocarbon group, or may be composed of these two types.

[0024] The component (B) 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 such phenols include 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. Component (B) is not particularly limited, but in terms of achieving the effects of the present application, it is preferable that the component (B) is at least one selected from polyoxyalkylene polyols and organic compounds having at least one group selected from an oxyalkylene group and a hydroxyl group and having a hydrocarbon group having 1 to 22 carbon atoms.

[0025] The molecular weight of component (B) 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 precipitation of solid matter 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. When the molecule of component (B) contains a repeating unit such as the oxyalkylene group, the molecular weight is the weight average molecular weight. The weight average molecular weight of component (B) is measured by the method described in the Examples.

[0026] [Component (C)] The decomposing agent composition of the present invention may further contain, but is not particularly limited to, the following component (C). Component (C): Inorganic salts When the decomposing composition of the present invention contains component (C), the permeability of the decomposing composition into the inside of the asphalt emulsion is improved, which is preferable in that it reduces the amount of undecomposed emulsion and efficiently coalesces the asphalt.

[0027] There are no particular limitations on component (C), but it is preferable that the component (C) is water-soluble in order to achieve the effects of the present invention. The solubility of component (C) in water at 20°C is not particularly limited, but is preferably 1g / 100g or more. When the solubility is within the above range, the stability of the decomposition agent composition tends to be improved. The solubility is more preferably 5g / 100g or more, and even more preferably 10g / 100g or more.

[0028] Examples of the component (C) include carbonates, sulfates, nitrates, phosphates, and hydrochlorides, and these may be used alone or in combination of two or more. 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.

[0029] 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.

[0030] Furthermore, although there are no particular limitations on component (C), it is preferable for the component (C) to contain at least one selected from sulfates and phosphates, as this improves the affinity with the asphalt emulsion. When component (C) contains a sulfate and a phosphate, the total weight percentage of the sulfate and the phosphate in component (C) 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 component (C) contains a sulfate or a phosphate, the respective weight percentages are preferably in the above-mentioned numerical ranges.

[0031] [Other ingredients] The decomposing agent composition of the present invention may contain other components such as a water-soluble solvent, a surfactant other than an anionic surfactant, an antifoaming agent, water, and the like, 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.

[0032] 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 these may be used alone or in combination of two or more kinds. 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.

[0033] [Asphalt emulsion decomposer composition and its manufacturing method] The asphalt emulsion decomposer composition of the present invention contains the above-mentioned components (A) and (B), and exhibits excellent decomposition properties for asphalt emulsions, and further has excellent stability and can be uniformly dispersed. The decomposition composition of the present invention is 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.

[0034] The content of component (B) is not particularly limited, but is preferably 1 to 700 parts by weight relative to 100 parts by weight of component (A). If the content is 1 part by weight or more, the oil droplets of the asphalt emulsion tend to be broken down and the coalescence of the asphalt tends to be promoted, and if the content is 700 parts by weight or less, the stability of the decomposer composition tends to be improved. The lower limit of the content is more preferably 5 parts by weight, even more preferably 10 parts by weight, and particularly preferably 20 parts by weight. On the other hand, the upper limit of the content is more preferably 500 parts by weight, even more preferably 300 parts by weight, and particularly preferably 250 parts by weight.

[0035] When the decomposer composition of the present invention contains component (C), the content of component (C) is not particularly limited, but is preferably 5 to 300 parts by weight relative to 100 parts by weight of the content of component (A). When the content is 5 parts by weight or more, the permeability of the decomposer composition into the asphalt emulsion tends to improve, and when it is 300 parts by weight or less, the stability of the decomposer composition tends to improve. The lower limit of the content is more preferably 10 parts by weight, and even more preferably 15 parts by weight. On the other hand, the upper limit of the content is more preferably 200 parts by weight, and even more preferably 100 parts by weight.

[0036] The decomposition agent composition of the present invention may be in the form of an aqueous solution or a dispersion in water. When the decomposition agent composition is an aqueous solution or dispersed in water, the content of water is not particularly limited, but is preferably 50 to 3000 parts by weight relative to 100 parts by weight of the total content of components (A) and (B). If the content is 50 parts by weight or more, the stability of the decomposition agent composition tends to be improved, and if it is 3000 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 2000 parts by weight, and even more preferably 1000 parts by weight.

[0037] The specific gravity of the decomposing 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 composition into the asphalt emulsion tends to be improved, 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. In addition, when the decomposing composition is an aqueous solution or dispersed in water, the specific gravity may be in the above numerical range. The specific gravity of the decomposition composition of the present invention at 20° C. is measured by the method described in the Examples.

[0038] When the decomposer composition of the present invention is an aqueous solution or a dispersion in water, the viscosity of the decomposer composition at 20°C is not particularly limited, but is preferably 500 mPa·s or less. If the viscosity is 500 mPa·s or less, the composition tends to be able to be sprayed more uniformly over a wider range. The upper limit of the viscosity is more preferably 400 mPa·s or less, even more preferably 300 mPa·s or less, and particularly preferably 200 mPa·s or less. On the other hand, the lower limit of the viscosity is preferably 0.1 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.

[0039] The method for producing the decomposer composition of the present invention is not particularly limited, and examples thereof include a method of mixing components (A) and (B) with component (C) and other components as necessary, and a method of preparing a mixed liquid in which components (A) and (B) are dissolved or dispersed in water at a high concentration in advance, and adding component (C) and other components as necessary to the prepared mixed liquid and mixing them, etc. In the method for producing the decomposer composition, the mixing order, etc. is not particularly limited, and all 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 is no particular limitation on the mixing method, and the mixing can be carried out using an apparatus equipped with a very simple mechanism such as a container and a stirring blade.

[0040] [Asphalt pavement construction method] 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.

[0041] 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

[0042] 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.

[0043] [Preparation of decomposition composition] Decomposer compositions of Examples 1 to 20 and Comparative Examples 1 to 8 were produced so as to have the weight ratios shown in Tables 1 and 2. The physical properties of the produced decomposer 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.

[0044] [Method of measuring specific gravity] The specific gravity of the decomposition composition at a temperature of 20° C. was measured in accordance with the method described in JIS-Z8804-9. Density and specific gravity meter: Kyoto Electronics Manufacturing Co., Ltd. DA-200

[0045] [Method of measuring viscosity] The viscosity of the decomposing agent composition at a temperature of 20° C. was measured using a Brookfield viscometer.

[0046] [Method of measuring weight average molecular weight] The weight average molecular weight of the component (B) was measured by gel permeation chromatography (GPC) using the method described below. Component (B) 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 component (B) 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: 0.3 mL / min Temperature: 40℃

[0047] [Evaluation of stability of decomposition agent composition] 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 occurs or solids settle

[0048] [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. × 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.

[0049] 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 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 the above compounds, POE means polyoxyethylene, POP means polyoxypropylene, and the numbers in parentheses following POE or POP indicate the number of moles of oxyethylene or oxypropylene added.

[0050] [Table 1]

[0051] [Table 2]

[0052] [Table 3]

[0053] As can be seen from Tables 1 to 3, the decomposition agent compositions of Examples 1 to 20 contain an anionic surfactant (A) and an organic compound (B) having a solubility in water of 20 g / 100 g or less at a temperature of 20° C., and therefore are able to solve the problem of the present application. On the other hand, when the component (A) is not included (Comparative Examples 2, 4 to 6) and when the component (B) is not included (Comparative Examples 1, 3, 7, and 8), the problem of the present application cannot be solved.

Claims

1. An asphalt emulsion decomposer composition comprising the following components (A) and (B): Component (A): Anionic surfactant Component (B): an organic compound having a solubility in water of 20 g / 100 g or less at a temperature of 20° C.

2. The asphalt emulsion decomposer composition according to claim 1, wherein the component (B) has at least one group selected from an oxyalkylene group and a hydroxyl group.

3. The decomposer composition for asphalt emulsion according to claim 1 or 2, wherein the component (B) has a hydrocarbon group having 1 to 22 carbon atoms.

4. The decomposer composition for asphalt emulsion according to claim 1 or 2, wherein the molecular weight of the component (B) is 3,000 or less.

5. The asphalt emulsion decomposer composition according to claim 1 or 2, wherein the content of the component (B) is 1 to 700 parts by weight relative to 100 parts by weight of the component (A).

6. The asphalt emulsion decomposer composition according to claim 1 or 2, wherein the component (A) comprises an anionic surfactant (a1) containing a sulfur atom.

7. The asphalt emulsion decomposer composition according to claim 1 or 2, having a specific gravity at 20°C of 0.9 to 1.

3.

8. 3. A method for applying asphalt pavement, comprising the step of contacting an asphalt emulsion with the asphalt emulsion decomposer composition according to claim 1 or 2.

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