TW201634552A - Asphalt additive - Google Patents

Abstract

The invention pertains to an additive for asphalt to be used for laying down the roadway of an asphalt pavement. The invention provides an asphalt mixture for a roadway pavement, an asphalt composition, and an asphalt additive with which it is possible to reduce the viscosity of the asphalt and the temperature when the asphalt and an aggregate are mixed and when the asphalt mixture is laid, and with which an asphalt pavement having exceptional stability in the laid-down roadway can be obtained.

Description

Asphalt additive

The present patent application claims priority to Japanese Patent Application No. 2015-016954 (filed Jan. 30, 2015), the entire disclosure of which is incorporated herein by reference. .

The present invention relates to an additive for asphalt used in road construction for asphalt pavement. Here, the asphalt is a bitumen used for asphalt paving.

In the case of road construction where asphalt pavement is carried out, the asphalt is heated and mixed with the aggregate in an asphalt mixing place to form an asphalt mixture, and then transported to a construction site for use. In general, the viscosity of the asphalt changes due to temperature, and the higher the temperature, the lower the viscosity, and the lower the temperature, the higher the viscosity and the lower the fluidity. Since the viscosity of the asphalt is required to be sufficiently low when it is heated and mixed in the asphalt mixing place or when the road is applied, it is necessary to appropriately set the temperature at the time of mixing or construction depending on the type of the asphalt.

When the straight-run asphalt and the aggregate are mixed, the heating and mixing in the asphalt mixing place is performed at about 160 ° C, and the construction temperature in the construction site is 110 ° C to 150 ° C. Therefore, the asphalt mixture is shipped from the asphalt mixing place at a temperature of about 160 ° C, but the viscosity is lowered due to cooling during transportation to the construction site. Further, it is known that the asphalt is liable to be deteriorated by heating, and the performance of the deteriorated asphalt after the construction, particularly the stability or the grip strength of the aggregate, is lowered, and the viscosity is increased. Therefore, in order not to cause such deterioration, it is preferred to Heat mixing or construction at low temperatures.

As a pavement road for increasing traffic load in high-load traffic routes In the industry, a pitch (modified pitch H type, etc.) which is modified with a polymer such as SBS (styrene, butadiene or styrene block copolymer) to reform straight asphalt is used. The modified bitumen must have a higher viscosity than the straight-run bitumen and be heated and mixed with the aggregate at a temperature higher than that of the straight-run bitumen. When using the modified asphalt H type, the heating and mixing temperature is usually about 170 ° C ~ 180 ° C, and the construction temperature is 140 ° C ~ 170 ° C.

In addition, in order to further improve the durability of the asphalt pavement, in order to further improve the durability of the asphalt pavement, in recent years, an asphalt which is more highly modified than the modified asphalt H-type to further increase the amount of SBS is developed. However, since such an asphalt must be heated and mixed at a higher temperature, it is liable to cause deterioration. Therefore, in order to avoid such deterioration, it is required to lower the viscosity of the asphalt without increasing the heating mixing or the application temperature.

The bituminous mixture used in the asphalt pavement is repaired as it deteriorates with the increase in the number of years, at which time the asphalt mixture peeled off from the road is recycled. However, the repeated use of the asphalt mixture for regeneration causes the asphalt in the asphalt mixture to deteriorate considerably, so that the viscosity becomes very high as compared with the new asphalt. In addition, the recycling of the asphalt mixture is mainly carried out on the straight-run asphalt, but the repair of the paving material using the modified asphalt will be mixed with the recycled asphalt in the recycled product of the straight-run asphalt, and as a result, the recycled product is used. The viscosity of the asphalt becomes higher. Therefore, it is required to reduce the viscosity of the asphalt during the heating and mixing of the asphalt and the construction work.

Conventionally, as a technique for lowering the viscosity of the asphalt, a method of adding an oil component such as mineral oil to the pitch to lower the viscosity of the asphalt at a high temperature has been known. However, in the method of adding an oil component, since the pitch after the addition of the oil component becomes soft, the grip strength of the asphalt mixture after cooling is lowered, and the stability of the road after the construction is insufficient.

In addition, as a medium temperature technique for reducing the mixing temperature of the material of the asphalt mixture and the temperature at the time of paving construction, a method of adding a specific organic foaming agent and a foaming aid as a medium temperature agent has been proposed (Patent Document 1). However, the method of adding the medium temperature agent Although the temperature during mixing can be lowered, it can only be applied to a method of adding a medium temperature agent in an asphalt mixing place (factory mixing method). In the method of adding a medium temperature agent to the asphalt in advance (premixing method), foaming occurs at the time point when the medium temperature agent is added to the pitch, the asphalt becomes unstorable, and the bone cannot be subsequently formed. Mix of materials. Therefore, the grip strength of the asphalt mixture is lowered, and the stability of the road after construction is insufficient.

Further, a method of adding a wax (fatty acid) is also carried out, but the asphalt pavement obtained by the method is also insufficient in terms of stability or dynamic stability.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-131321

As such, the industry has previously studied techniques for reducing the viscosity of asphalt, but since these techniques all impair the workability or the characteristics of the asphalt mixture at the time of addition, it is expected that a mixture temperature of the asphalt and the aggregate and the asphalt mixture are expected. The temperature at the time of construction is lowered, and the asphalt additive for the workability in the production of the asphalt mixture and the excellent grip strength of the aggregate after the construction can be achieved at the same time.

The invention provides an asphalt additive and asphalt combination for asphalt pavement which can reduce the viscosity of the asphalt, mix the asphalt and the aggregate, and reduce the temperature when the asphalt mixture is applied, and obtain the stability of the road after the construction. Asphalt mixture for objects and road paving.

The inventors of the present invention have conducted an effort to study an asphalt additive having a viscosity-reducing effect of asphalt and a mixture of asphalt and a bituminous mixture during construction and an excellent grip of the aggregate, and as a result, it has been found that it can be expressed by a specific formula. The compound eliminates the above problems, thereby completing the present invention.

That is, the present invention includes the following.

[1] An additive for asphalt comprising a compound represented by formula (1) or a salt thereof.

[wherein, n and m are each independently an integer from 1 to 20, l is an integer from 1 to 4, and p and q are each independently 0 or 1, and A ¹ and A ² independently represent -CO-, -CH ₂ - , -O-, -CO ₂ -, or -OCO-, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may also be bonded. Forming a ring structure]

[2] The additive for the asphalt according to the above [1], wherein the compound represented by the above formula (1) or a salt thereof is a compound represented by the formula (3) or a salt thereof.

[wherein, n and m are each independently an integer from 1 to 20, and p and q are each independently 0 or 1, and A ¹ and A ² independently represent -CO-, -CH ₂ -, -O-, -CO ₂ -, or -OCO-, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may be bonded to form a cyclic structure]

[3] The additive for the asphalt according to the above [1], wherein the compound represented by the formula (1) or a salt thereof is a compound represented by the formula (4) or a salt thereof, or a compound represented by the formula (5) Or its salt.

[wherein, t and u are each independently an integer of 2 to 6, and R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may also be bonded. Forming a ring structure]

[4] The additive for the asphalt according to the above [1], wherein the compound represented by the above formula (1) or a salt thereof is a compound represented by the formula (6) or a salt thereof.

[where t and u are independent integers of 2~6, respectively]

[5] The additive for pitch according to any one of [1] to [4] wherein the salt is a carboxylate.

[6] The additive for asphalt according to any one of the above [1] to [5], further comprising at least one selected from the group consisting of petroleum-based mixed oils and lubricating oils.

[7] The additive for pitch according to [6], wherein the content of the compound represented by the formula (1) or a salt thereof is from 0.01 part by weight to 200 parts by weight per 100 parts by weight of the oil.

[8] The additive for asphalt described in [6] or [7], which further comprises a surfactant.

[9] The additive for pitch according to [8], wherein the content of the surfactant is 0.01 parts by weight to 100 parts by weight based on 100 parts by weight of the compound represented by the formula (1) or a salt thereof.

[10] An asphalt composition containing the additive for pitch as described in any one of the above [1] to [9], and an asphalt.

[11] The asphalt composition according to the above [10], which contains 0.005 parts by weight to 20 parts by weight of the compound represented by the formula (1) or a salt thereof, based on 100 parts by weight of the pitch.

[12] A bituminous mixture for road paving, comprising the bituminous composition and the aggregate according to the above [10] or [11].

[13] The asphalt mixture according to [12] above, which is used for production and construction at a temperature of from 100 to 300 °C.

[14] A surfacing body comprising the road paving according to the above [12] or [13] Asphalt mixture.

According to the present invention, the viscosity of the asphalt mixture during the mixing of the asphalt and the aggregate and the asphalt construction can be lowered, and the temperature of the asphalt and the aggregate and the temperature during the asphalt construction can be lowered. Moreover, since the grip strength of the aggregate can be improved, an asphalt pavement excellent in stability of the road after construction can be obtained.

Hereinafter, the present invention will be described in detail.

The additive for asphalt of the present invention contains a compound represented by the following formula (1) or a salt thereof.

[wherein, n and m are each independently an integer of 1 to 20, preferably an integer of 2 to 6, more preferably an integer of 2 to 3, and l is an integer of 1 to 4, preferably an integer of 2 to 4. More preferably, 2, p and q are each independently 0 or 1, and A ¹ and A ² independently represent -CO-, -CH ₂ -, -O-, -CO ₂ -, or -OCO-, preferably And -CO-, or -CH ₂ -, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may be bonded to form a cyclic structure]

The compound represented by the formula (1) or a salt thereof is preferably a compound represented by the following formula (3) or a salt thereof.

[wherein, n and m are each independently an integer of 1 to 20, preferably an integer of 2 to 6, more preferably an integer of 2 to 3, and p and q are independently 0 or 1, respectively, and A ¹ and A ² are respectively Independently represents -CO-, -CH ₂ -, -O-, -CO ₂ -, or -OCO-, preferably -CO-, -CH ₂ -, R ¹ , R ² , R ³ and R ⁴ respectively Independently represents a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may also bond to form a cyclic structure]

The compound represented by the formula (1) or a salt thereof is more preferably a compound represented by the following formula (4) and/or formula (5) or a salt thereof.

[In the formulas (4) and (5), t and u are each independently an integer of 1 to 20, preferably an integer of 2 to 6, more preferably an integer of 2 to 3, and p and q are each independently 0 or 1, preferably 0, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may also bond to form a cyclic structure]

The compound represented by the formula (1) or a salt thereof is more preferably a compound represented by the following formula (6) or a salt thereof.

[wherein, t and u are each independently an integer of 1 to 20, preferably an integer of 2 to 6, more preferably an integer of 2 to 3]

The hydrocarbon group which may have a substituent of R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ , preferably a hydrocarbon group having 1 to 30 carbon atoms which may have a substituent, may be a saturated hydrocarbon group, It may be an unsaturated hydrocarbon group, may be a linear or branched hydrocarbon group, or may have a cyclic structure in one part of the base. Further, examples of the substituent include a hetero atom-containing group and a halogen atom. The hetero atom-containing group may have one hetero atom, and may contain the same or different plural hetero atoms. Examples thereof include a hydroxyl group and an alkoxy group having 1 to 20 carbon atoms. In the above hydrocarbon group, examples of the hydrocarbon group having 3 to 20 carbon atoms include propyl, butyl, pentyl, hexyl, heptyl, octyl, decyl, decyl, undecyl, and dodecane. , tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, stearyl, lauryl, meat Myristyl, 2-ethylhexyl, 9-hexadecenyl, cis-9-octadecyl, 11-octadecenyl, cis, cis-9,12-octadecaene , 9,12,15-octadecatrienyl, 6,9,12-octadecatrienyl, 9,11,13-octadecatrienyl, octadecyltetraal, twenty Carbonyl, 11,14-eicosadienyl, 13,16-docosadienyl, 5,8,11,14-eicosatetraenyl, cis-15-twenty-four Alkenyl or alkenyl group such as hexenyl, eicosapentaenyl, docosylpentenyl, docosylhexenyl, 11-hydroxy-8-cis heptadecenyl; hexylphenyl , heptylphenyl, octylphenyl, nonylphenyl, nonylphenyl, undecylphenyl, dodecylphenyl, tridecylphenyl, tetradecylphenyl, ten Pentaalkylphenyl, An alkylphenyl group such as hexadecylphenyl, heptadecylphenyl or octadecylphenyl; and a phenyl group. Among these, an alkyl group having 3 to 20 carbon atoms, a phenyl group and an alkylphenyl group having 7 to 18 carbon atoms are preferable, and a linear alkyl group having 6 to 18 carbon atoms is more preferable. Of these, it is further preferably hexyl, heptyl, octyl, decyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, Heptadecyl, octadecyl, and 11-hydroxy-8-cis heptadecenyl. Furthermore, in the present specification, the above alkenyl group includes not only one double bond but also two or more double bonds, such as an alkadienyl group, an alkanetrienyl group and the like.

In the formula (1), R ^{1 is} preferably the same as R ⁴ , preferably R ² is the same as R ³ , preferably A ¹ is the same as A ² , preferably n is the same as m, preferably p and q. the same.

In the formula (3), R ¹ and R ⁴ are preferably the same, preferably R ² is the same as R ³ , preferably A ¹ is the same as A ² , preferably n is the same as m, preferably p and q. the same.

In the formula (4), R ¹ and R ⁴ are preferably the same, and it is preferred that R ² is the same as R ³ , and it is preferable that t is the same as u.

In the formula (5), R ¹ and R ⁴ are preferably the same, and R ² and R ³ are preferably the same, and t is preferably the same as u.

In the formula (6), t is preferably the same as u.

As a compound represented by the formula (1), it is preferred that l is an integer of 2 to 4, and n and m are each independently an integer of 2 to 6, and p and q are each independently 0 or 1, and A ¹ and A ² are respectively a compound represented by the formula (1) which is independently -CO- or -CH ₂ -, R ² and R ³ are a hydrogen atom, and R ¹ and R ⁴ are each independently a hydrogen atom or an alkyl group having 3 to 20 carbon atoms; l is an integer from 2 to 4, n and m are each an integer of 2 to 6, and p and q are each independently 0 or 1, and A ¹ and A ² are independently -CO-, or -CH ₂ -, R ² And R ³ is a hydrogen atom, and R ¹ and R ⁴ each independently represent a compound represented by the formula (1) of a hydrogen atom, a phenyl group or an alkylphenyl group having 7 to 18 carbon atoms; and l is an integer of 2 to 4, n And m are independently an integer of 2-6, p and q are each independently 0 or 1, and A ¹ and A ² are independently -CO-, or -CH ₂ -, and R ² and R ³ are hydrogen atoms, R ¹ And R ⁴ are each independently a hydrogen atom or a compound represented by the formula (1) having a linear alkyl group having 6 to 18 carbon atoms; 1 is an integer of 2 to 4, and n and m are the same and an integer of 2 to 6, p and q are 1, and A ¹ and A ^{2 are the} same and are -CO-, R ² and R ³ are hydrogen atoms, and R ¹ and R ^{4 are the} same and are represented by the formula (1) having an alkyl group having 3 to 20 carbon atoms. a compound; l is an integer from 2 to 4, n and m The same and is an integer of 2 to 6, p and q is 1, and A ¹ and A ² is the same as CO-, R ² and R ³ is a hydrogen atom, R ¹ and R are the same and a carbon number of ⁴⁶ to 18 a linear alkyl group of the compound represented by the formula (1); l is an integer of 2 to 4, n and m are the same and an integer of 2 to 6, p and q are 0, and R ² and R ³ are a hydrogen atom. R ¹ and R ⁴ are a compound represented by the formula (1) which is a hydrogen atom or the same and is an alkyl group having 3 to 20 carbon atoms; and l is an integer of 2 to 4, and n and m are the same and are 2 to 6 a compound represented by the formula (1) in which an integer, p and q are 0, R ² and R ³ are a hydrogen atom, and R ¹ and R ⁴ are a hydrogen atom or a linear alkyl group having the same carbon number of 6 to 18 .

As the compound represented by the formula (3), it is preferred that n and m are each independently an integer of 2 to 6, and p and q are each independently 0 or 1, and A ¹ and A ² are independently -CO- or -CH, respectively. ₂ -, R ² and R ³ are each a hydrogen atom, and R ¹ and R ⁴ each independently represent a compound represented by the formula (3) of a hydrogen atom or an alkyl group having 3 to 20 carbon atoms; n and m are each independently 2 to 6 The integers, p and q are each independently 0 or 1, and A ¹ and A ² are independently -CO- or -CH ₂ -, R ² and R ³ are each a hydrogen atom, and R ¹ and R ⁴ are each independently a hydrogen atom. a compound represented by the formula (3) of a phenyl group or an alkylphenyl group having 7 to 18 carbon atoms; n and m are each independently an integer of 2 to 6, and p and q are each independently 0 or 1, and A ¹ and A ^{2 are respectively} Independently being -CO- or -CH ₂ -, R ¹ and R ³ are each a hydrogen atom, and R ¹ and R ⁴ are each independently a hydrogen atom or a linear alkyl group having 6 to 18 carbon atoms; a compound represented by n; m and m are the same and an integer of 2 to 6, p and q are 1, A ¹ and A ^{2 are the} same and are -CO-, R ² and R ³ are hydrogen atoms, and R ¹ and R ^{4 are the} same and a compound represented by the formula (3) having an alkyl group having 3 to 20 carbon atoms; n and m are the same and an integer of 2 to 6, p and q are 1, and A ¹ and A ^{2 are the} same and are -CO-, R ² and R ³ are hydrogen atoms, R ¹ and R ⁴ phases A compound represented by the formula (3) which is a linear alkyl group having 6 to 18 carbon atoms; n and m are the same and an integer of 2 to 6, p and q are 0, and R ² and R ³ are a hydrogen atom. And R ¹ and R ⁴ are a compound represented by the formula (3) which is a hydrogen atom or the same and is an alkyl group having 3 to 20 carbon atoms; and n and m are the same and are integers of 2 to 6, and p and q are 0. A compound represented by the formula (3) wherein R ² and R ³ are a hydrogen atom, and R ¹ and R ⁴ are a hydrogen atom or a linear alkyl group having the same carbon number of 6 to 18.

As a compound represented by the formula (4), t and u are each independently an integer of 2 to 6, and R ² and R ³ are each a hydrogen atom, and R ¹ and R ⁴ are each independently an alkyl group having 3 to 20 carbon atoms. a compound represented by the formula (4); t and u are each independently an integer of 2 to 6, R ² and R ³ are each a hydrogen atom, and R ¹ and R ⁴ are each independently a linear alkyl group having 6 to 18 carbon atoms; a compound represented by the formula (4); t and u are the same and are an integer of 2 to 6, R ² and R ³ are a hydrogen atom, and R ¹ and R ^{4 are the} same and are an alkyl group having 3 to 20 carbon atoms. (4) the compound represented; and t and u are the same and are an integer of 2 to 6, R ² and R ³ are a hydrogen atom, and R ¹ and R ^{4 are the} same and are a linear alkyl group having 6 to 18 carbon atoms. a compound represented by the formula (4).

As a compound represented by the formula (5), it is preferred that t and u are each independently an integer of 2 to 6, R ² and R ³ are each a hydrogen atom, and R ¹ and R ⁴ are each independently a hydrogen atom or a carbon number of 3 to 3; a compound represented by the formula (5) of 20 alkyl groups; t and u are each independently an integer of 2 to 6, R ² and R ³ are each a hydrogen atom, and R ¹ and R ⁴ are each independently a hydrogen atom or a carbon number of 6~ a linear chain alkyl group of the formula (5); t and u are the same and an integer of 2 to 6, R ² and R ³ are a hydrogen atom, and R ¹ and R ⁴ are a hydrogen atom or the same a compound represented by the formula (5) having an alkyl group having 3 to 20 carbon atoms; and t and u are the same and an integer of 2 to 6, R ² and R ³ are a hydrogen atom, and R ¹ and R ⁴ are a hydrogen atom; Or a compound represented by the formula (5) which is the same and is a linear alkyl group having 6 to 18 carbon atoms.

The additive for pitch of the present invention may contain a salt of the above compound, for example, a salt of an organic acid such as a carboxylic acid or a sulfonic acid of the above compound, or a salt of an inorganic acid such as hydrochloric acid, hydrobromic acid, sulfuric acid or phosphoric acid. In the present invention, examples of the carboxylate of the above compound include hexanoate, heptanoate, octoate, decanoate, decanoate, undecanoate, laurate, and tridecanoate. Myristate, pentadecanoate, palmitate, heptadecanoate, stearate, alpha-linolenic acid oleate, linoleate, oleate, ricinoleate, citric acid Salt, succinate, tartrate, malate, myristate, palm oleate, hexadecenoate, oleate, isooleate, oleate, dodecene Acid salt Salt, tetracosenoate, eicosadienoate, behenodiate, octadecatrienoate, octoate, mead acid , eicosatrienoic acid, octadecatetraenoate, arachidonic acid, eicosatetraenoic acid, adrenic acid ), octadecapentate, eicosapentaenoate, docosapentaenoate, salmonate, docosapentaenoate, docosahexaenoate, A saturated or unsaturated carboxylic acid having 2 to 30 carbon atoms such as tetradecane hexaenoate, rosinate, dehydroabietic acid salt, neo-rosin acid salt, sea pine acid salt, isopimasone salt, long-leafed pine acid salt Salt and so on. Among these, a saturated or unsaturated carboxylic acid salt having a carbon number of 8 to 24 is preferred, and a saturated or unsaturated carboxylic acid salt having a carbon number of 10 to 20 is more preferred, and more preferably a decanoate or a laurate. Myristate, pentadecanoate, palmitate, heptadecanoate, stearate, oleate, linoleate, linolenate, and ricinoleate.

The compound represented by the formula (1) can be produced, for example, by a known method such as the method described in "Journal of Organic Chemistry" by Jaesung Choi et al., 1995, vol. 60, p. 3266-3267.

The additive for asphalt of the present invention may contain at least one oil selected from the group consisting of petroleum-based mixed oils and lubricating oils. Examples of the petroleum-based mixed oil include an aromatic system having an aromatic carbon number of 35% by weight or more, a naphthenic system having a carbon number of 30 to 45% by weight of the total carbon number, and an alkane branch. The chain carbon number is an alkane system or the like having a total carbon number of 50% by weight or more. In the present invention, one or two or more of these may be used as appropriate. Examples of the lubricating oil include a petroleum-based lubricating oil, a synthetic lubricating oil, and a fatty oil. One or two or more of these may be used as appropriate. The term "oil-based lubricating oil" refers to a heavy oil having a boiling point of about 30 ° C or more obtained by distillation of crude oil at atmospheric distillation by vacuum distillation into various distillates, for example, dewaxing, sulfuric acid treatment, solvent extraction, respectively. , deasphalting, clay treatment, and other appropriate refining treatment, and finishing into the final product. The synthetic lubricating oil refers to a lubricating oil which is produced by an organic synthesis method and is generally classified according to the use, and for example, a spindle can be cited. Oil, compressor oil, motor oil, turbine oil, engine oil, engine oil, jet engine oil, hydraulic oil, etc. The fatty oil is mainly used in a petroleum-based lubricating oil, and is used as a blended oil for applications requiring oiliness or emulsifying properties. In the present invention, synthetic lubricating oil is preferably used. When the petroleum-based mixed oil and the lubricating oil are used in combination, the total amount thereof may be a specific amount.

When the additive for asphalt of the present invention contains an oil, the content of the compound represented by the formula (1) or a salt thereof is usually from 0.01 part by weight to 200 parts by weight, preferably 0.1 part by weight, per 100 parts by weight of the oil. 150 parts by weight, more preferably 1 to 100 parts by weight.

The additive for pitch of the present invention may contain a surfactant in addition to the above oil. As the surfactant, any of an ionic surfactant and a nonionic surfactant can also be used.

The ionic surfactant may, for example, be an anionic surfactant such as polyoxyethylene alkyl ether phosphate (salt), polyoxyethylene alkyl sulfosuccinate, alkyl sulfate, fatty acid salt or the like; Surfactants such as quaternary ammonium salts, fatty amide amines, and the like; amphoteric surfactants such as alkyl betaines, alkylated amines, and the like.

Examples of the nonionic surfactant include an ester surfactant having an ester structure, such as a sorbitan fatty acid ester, and an ether surfactant having an ether structure, such as polyoxyalkylene oxide. Alkyl ether, polyoxyethylene derivative, polyoxyethylene polyoxypropylene diol, and the like.

The additive for asphalt of the present invention may contain two or more kinds of surfactants. In the case where the additive for the pitch of the present invention contains a surfactant, the content of the surfactant is usually from 0.01 part by weight to 100 parts by weight per 100 parts by weight of the compound represented by the formula (1) or a salt thereof, preferably 0.05 parts by weight to 80 parts by weight, more preferably 0.1 parts by weight to 50 parts by weight.

Further, the present invention also provides an asphalt composition containing the above-mentioned additive for asphalt. The bitumen used in the present invention is not particularly limited, and examples thereof include natural asphalt such as lake asphalt; blended asphalt, petroleum raft, pitch, straight-run asphalt, blown asphalt, and semi-blowing. Petroleum asphalt such as asphalt and solvent deasphalting (for example, propane deasphalting). Examples of the natural pitch include hard pitch, brittle pitch, Trinidad lake pitch, and the like. These pitches may be used singly or in combination of two or more. Further, the artificial asphalt may be used as the raw material pitch by mixing the artificial pitch into the above pitch at an arbitrary ratio. An example of the artificial pitch which can be used in the present invention is a petroleum-based mixed oil of a petroleum-based mixed oil and an adhesion-imparting agent resin: an adhesive-imparting agent resin (0 to 100% by weight): The ratio of 100 to 0% by weight is obtained by blending.

In the asphalt composition of the present invention, as the asphalt, modified asphalt may be used, such as modified asphalt type I, modified asphalt type II, modified asphalt type H, high viscosity modified asphalt, and higher viscosity modified asphalt. The modified asphalt with higher viscosity is called asphalt of recycled asphalt.

As the modified asphalt, those obtained by modifying the straight-run asphalt with rubber and/or a thermoplastic elastomer can be used. As the rubber, natural rubber or chloroprene rubber can be cited. Examples of the thermoplastic elastomer include a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, and an acrylate. A methacrylate, a homopolymer of styrene, a copolymer of the above, and the like are preferably a styrene-butadiene block copolymer or a styrene-isoprene block copolymer. The total amount of the rubber and the thermoplastic elastomer is preferably from 0.1 to 25 parts by weight, more preferably from 1 to 20 parts by weight, still more preferably from 3 to 15 parts by weight, based on 100 parts by weight of the pitch.

The recycled asphalt is not particularly limited, and examples thereof include asphalt which is used for asphalt paving waste after road construction. In the present invention, various types of asphalt paving waste can be cited, and various types of asphalt paving wastes generated during various engineering operations, such as subway works, underground piping works, road paving works, and the like, can be cited. According to the present invention, in the case of any of the above-mentioned asphalts, the viscosity of the asphalt during heating mixing and construction can be reduced, and the effect of improving the grip strength of the aggregate can be exerted.

In the asphalt composition of the present invention, it is adjustable as long as it does not hinder the effect of the present invention. It is also known as a petroleum-based mixed oil for processing oil. Examples of the petroleum-based mixed oil include an aromatic system having an aromatic carbon number of 35% by weight or more, a naphthenic system having a carbon number of 30 to 45% by weight of the total carbon number, and an alkane branch. The chain carbon number is an alkane system or the like having a total carbon number of 50% by weight or more. In the present invention, one or two or more of these may be used as appropriate. Further, a lubricating oil may be used instead of the petroleum-based mixed oil, or both may be used in combination. When the two are used together, the total amount may be a specific amount. Examples of the lubricating oil include a petroleum-based lubricating oil, a synthetic lubricating oil, and a fatty oil. These may be used singly or in combination of two or more kinds. The term "oil-based lubricating oil" refers to a heavy oil having a boiling point of about 30 ° C or more obtained by distillation of crude oil at atmospheric distillation by vacuum distillation into various distillates, for example, dewaxing, sulfuric acid treatment, solvent extraction, respectively. , deasphalting, clay treatment, and other appropriate refining treatment, and finishing into the final product. The synthetic lubricating oil refers to a lubricating oil which is produced by an organic synthesis method and is generally classified according to the use, and examples thereof include spindle oil, compressor oil, motor oil, turbine oil, engine oil, engine oil, jet engine oil, and hydraulic pressure. Oil, etc. The fatty oil is mainly used in a petroleum-based lubricating oil, and is used as a blended oil for applications requiring oiliness or emulsifying properties. In the present invention, synthetic lubricating oil is preferably used.

In the asphalt additive and the asphalt composition of the present invention, various additives may be further prepared as long as the effects of the present invention are not impaired. The additive is not particularly limited, and examples thereof include fillers such as stone powder, talc, and calcium carbonate, and fibrous reinforcing agents such as cement, activated carbon, slaked lime, methyl cellulose, and polyvinyl alcohol, and 2,6-di-t-butyl group. An antioxidant such as -4-methylphenol, an ultraviolet absorber, a light stabilizer, and the like.

In the asphalt additive and the asphalt composition of the present invention, the adhesion-imparting resin may be blended as long as the effects of the present invention are not impaired. As the adhesion-imparting resin, any of a natural resin and a synthetic resin can be used. As the natural resin, a terpene resin can be used. Further, as the synthetic resin, a polymer resin such as a petroleum resin, a kumquat-tank resin, or a styrene resin can be used. The petroleum resin is a fraction having a boiling point of 20 to 60 ° C (C5 fraction) separated by distillation of a naphtha decomposition product. An aliphatic (C5-based) petroleum resin, an aromatic (C9-based) oil mainly composed of a fraction having a boiling point of 160 to 260 ° C (C9 fraction) separated by distillation of a naphtha decomposition product. An aliphatic/aromatic copolymerized (C5/C9-based) petroleum resin produced by copolymerizing these C5-based and C9-based petroleum resins, and mainly by distillation of a product obtained by decomposition of naphtha An alicyclic resin (DCPD-based), which is a high-purity dicyclopentadiene as a main component, is a nonylphenol resin obtained by copolymerizing a terpene resin with a phenol. In addition to these, as the petroleum resin, a petroleum system such as a natural wax, a synthetic wax, or a blending wax can be used, and various waxes of a coal-based or polymer-based system can be used in the same manner. Examples of such may include paraffin wax, microcrystalline wax, pine wax, Fischer-Tropsch wax, ramie wax, hydrogenated wax, montan wax, polyethylene wax, polypropylene wax, and the like. In the present invention, one of these may be used. Either two or more types are mixed and used.

In the asphalt additive and the asphalt composition of the present invention, sulfur or an organic peroxide may be further formulated as long as the effects of the present invention are not impaired. Examples of the sulfur include fine powder sulfur, colloidal sulfur, precipitated sulfur, and dispersible sulfur, and are not limited thereto. Examples of the organic peroxide include dicumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, and 1,3-bis(2- Tributylperoxyisopropyl)benzene, ditributyl peroxide, 2,5-dimethyl-2,5-bis(t-butylperoxy)-3-hexyne, and the like.

Further, the additive for asphalt of the present invention and the asphalt composition containing the same may contain water in an amount that does not impair the effects of the present invention.

The bituminous composition of the present invention contains preferably from 0.005 parts by weight to 20 parts by weight, more preferably from 0.01 part by weight to 15 parts by weight, even more preferably from 0.1 part by weight to 10 parts by weight, based on 100 parts by weight of the bitumen ( 1) A compound or a salt thereof.

The asphalt composition of the present invention may also be applied to a premixing method of adding and mixing the additive for asphalt of the present invention to the asphalt before adding the aggregate, and to the additive of the present invention when the asphalt and the aggregate are mixed in the asphalt mixing place. Any method of factory mixing. In the case of the premixing method, there is an advantage in eliminating the labor and time of inputting materials in the asphalt mixing place. In the premixing method, a homomixer, a dispersing mixer, a paddle mixer, a belt mixer, The components are mixed by a screw mixer, a planetary mixer, a vacuum countercurrent mixer, or the like. In the case of the factory mixing method, each component may be stirred and mixed using a kneading mixer, a cyclone mixer, a screw mixer, or the like.

Moreover, the method of adding the additive for pitch of the present invention to the pitch is not particularly limited, and the pitch or the mixture is heated and melted at 100 to 300 ° C, preferably 120 to 280 ° C, more preferably 150 to 250 ° C. When a mixture of asphalt and aggregate is stirred, a specific amount may be added. Further, since the additive of the present invention has good solubility and affinity for pitch, it is also mixed under the degree of vibration during heat convection or transportation, and therefore, stirring may not be performed. However, it is preferable to require immediate effect. Mix and mix. Further, in the case where a rubber and/or a thermoplastic elastomer is added to the pitch, the additive for pitch of the present invention and the rubber and/or the thermoplastic elastomer may be simultaneously added to the heated pitch or may be separately added. When it is added separately, the order of addition is not specifically limited.

The bituminous composition containing the additive for pitch of the present invention can be confirmed by setting the measurement conditions according to the composition, the heating and mixing temperature, the application temperature, and the like using, for example, a Brookfield B-type viscometer. In the case of upgrading the bitumen H type, the viscosity can be measured, for example, at a temperature of 150 °C. Further, in the case of reclaiming asphalt, the viscosity can be measured at, for example, a temperature of 170 °C.

The bituminous composition containing the additive for asphalt of the present invention can be used for road paving materials, roofing materials, waterproof materials, and the like. The bituminous composition of the present invention is preferably used in an asphalt mixture because of its excellent grip strength, and is suitable for use in the paving of road paving asphalt mixtures, especially high porosity and drainage pavements and water permeable pavements. High-load traffic road pavement.

The asphalt mixture of the present invention can be produced by mixing the asphalt composition of the present invention with an aggregate such as crushed stone. As the aggregate, there is no particular limitation as long as it is described in the asphalt paving outline, the pavement design and construction guide, and the pavement construction manual (issued by the Japan Road Association, which is a public interest corporation), and may include gravel, sand, sand, Slag and fillers. In addition to these materials, various low-quality aggregates, recycled aggregates, and the like can be used regardless of the material or the like. The aggregate may be used singly or in the form of a mixture of two or more. When it is used in the form of a mixture of two or more kinds, the type and the blending ratio of each of the aggregates can be appropriately selected depending on the necessary strength of the paving body, the location of the paving body, the water permeability, and the like. The asphalt mixture of the present invention preferably comprises an asphalt composition and an aggregate comprising gravel, sand and filler. In the present invention, the blending ratio of the asphalt composition to the aggregate is preferably from 1 to 15% by weight of the asphalt composition, from 99 to 85% by weight of the aggregate, based on the total weight of the asphalt mixture, more preferably 1~ 10% by weight of the asphalt composition, 99 to 90% by weight of the aggregate.

Hereinafter, the present invention will be described in more detail by way of examples, but the invention is not limited to the examples.

[Examples]

Degraded asphalt

Using the new straight-run asphalt 60-80 (manufactured by JX Nippon Mining & Energy Co., Ltd.), according to the film heating deterioration test of JIS K 2207, after heating and degrading at 163 ° C for 5 hours, according to the pavement survey and test method manual (public interest corporation) The pressure deterioration test described in the Japan Road Association) was made into a deteriorated pitch at 105 ° C and a pressure of 2.10 MPa over 21 hours. The deteriorated pitch produced by the method is considered to be effective for producing a deteriorated material because the asphalt is placed outside the house and is substantially regenerated in a state of deterioration for about five years, so that it is a simulation of the recycled asphalt.

Viscosity measurement

(Example 1)

The viscosity was measured by adding a pitch composition of 5 parts by weight of bis(3-aminopropyl)disulfide to 100 parts by weight of the deteriorated pitch at 160 ° C for 3 minutes using a Brookfield B-type viscometer. Thereafter, the viscosity at 110 ° C was continuously measured. The results are shown in Table 1. Furthermore, the unit of viscosity in the table is centipoise (cP).

(Examples 2 to 3)

Except that the bis(3-aminopropyl) disulfide was changed to the compound described in Table 1, The asphalt composition was obtained in the same manner as in Example 1 and the viscosity was measured.

(Comparative Example 1)

An asphalt composition was obtained in the same manner as in Example 1 except that bis(3-aminopropyl)disulfide was not used, and viscosity measurement was carried out.

(Comparative Example 2)

In addition to the conversion of bis(3-aminopropyl) disulfide to mineral oil manufactured by Showa Shell Oil Company (kinetic viscosity at 40 ° C (JIS K 2283) = 257 mm ² /s, pour point (JIS K 2269) = The asphalt composition was obtained in the same manner as in Example 1 except for -22.5 ° C), and the viscosity was measured.

(Examples 4 to 10)

In addition to changing the deteriorated pitch to the modified bitumen H type, the bis(3-aminopropyl) disulfide was changed to the compound described in Table 2, and the temperature of the viscosity measurement was changed to 170 ° C and 150 ° C, and the implementation was carried out. Example 1 A bituminous composition was obtained in the same manner, and viscosity measurement was carried out.

(Comparative Example 3)

The asphalt composition was obtained in the same manner as in Example 4 except that bis(3-aminopropyl)disulfide was not used, and the viscosity was measured.

(Comparative Example 4)

In addition to the conversion of bis(3-aminopropyl) disulfide to mineral oil manufactured by Showa Shell Oil Company (kinetic viscosity at 40 ° C (JIS K 2283) = 257 mm ² /s, pour point (JIS K 2269) = An asphalt composition was obtained in the same manner as in Example 4 except for -22.5 ° C), and viscosity measurement was performed.

(Comparative Example 5)

The asphalt composition was obtained in the same manner as in Example 4 except that the bis(3-aminopropyl)disulfide was changed to stearic acid, and the viscosity was measured.

(Example 11)

The weight ratio of the aggregate (gravel: sand: filler) at 170 ° C is about 80: about 15: about 5 The mixture was mixed with 5 parts by weight of the asphalt composition prepared in Example 4, and then tamped to obtain a drainage asphalt mixture having a void ratio of 20% (maximum particle diameter of the aggregate of 13 mm). The properties of the obtained asphalt mixture are shown in Table 3. The stability of the asphalt mixture was evaluated by the Marshall stability test. Regarding the Marshall stability, the stability is excellent when the value is high. The grip strength of the asphalt mixture was evaluated by the Kentaberg test. In the Kentaberg test, the loss rate due to the scattering of aggregates was lower at lower values.

(Comparative examples 6 to 8)

A drain asphalt mixture was obtained in the same manner as in Example 11 except that the asphalt composition prepared in Comparative Examples 3 to 5 was used instead of the asphalt composition prepared in Example 4, and the viscosity was measured. The results are shown in Table 3.

(Embodiment 12)

A drainage asphalt mixture was obtained in the same manner as in Example 11 except that the asphalt composition prepared in Example 4 was changed to the asphalt composition prepared in Example 5, and the temperature of the mixture was changed to 150 ° C. Evaluation of the stability of the asphalt mixture and the grip strength of the aggregate.

(Comparative examples 9 to 10)

A drainage asphalt mixture was obtained in the same manner as in Example 12 except that the asphalt composition prepared in Comparative Examples 3 to 4 was changed to the asphalt composition prepared in Example 5, and the stability of the drainage asphalt mixture was carried out. Evaluation of the grip strength of the aggregate.

(Example 13)

100 parts by weight of mineral oil (JIS K 2283) = 257 mm ² /s, pour point (JIS K 2269) = -22.5 ° C) manufactured by Showa Shell Oil Co., Ltd. at room temperature, It is 25 parts by weight of bis(3-aminopropyl)disulfide, and 7.5 parts by weight of sorbitan fatty acid ester, thereby obtaining the additive A.

An asphalt composition was obtained in the same manner as in Example 1 except that 5 parts by weight of the additive A was used instead of 5 parts by weight of bis(3-aminopropyl)disulfide. And the obtained asphalt The composition was subjected to viscosity measurement. The results are shown in Table 1.

(Example 14)

A drainage asphalt mixture was obtained in the same manner as in Example 11 except that the asphalt composition prepared in Example 13 was used instead of the asphalt composition produced in Example 4. The viscosity of the obtained drainage asphalt mixture was measured. The results are shown in Table 3.

Further, in the examples and comparative examples, the physical properties of the asphalt composition and the asphalt mixture were measured or defined in the following manner.

<Measurement of Asphalt Composition>

(viscosity)

The measurement was carried out using a Brookfield B-type viscometer at the temperatures described in the respective tables.

<Measurement of asphalt mixture>

(Marshall Stability Test and Kentaberg Test)

It is carried out according to the test method described in the Handbook of the Pavement Test Method (issued by the Japan Road Association). The tamping system was carried out at a temperature lower than the mixing temperature by 15 ° C in such a manner that the pitch mixture produced in each of the examples and the comparative examples was 20%. Regarding the degree of compaction, the ratio of the density before compaction to the density of the asphalt mixture after compaction, that is, the void ratio is expressed in %.

As is clear from Table 1 or Table 2, by mixing the additives for asphalt of the present invention (Examples 1 to 10 and Example 13), the viscosity of the asphalt mixture was drastically reduced as compared with Comparative Example 1 or 3 to which no additive was added. Further, it is clear from Comparative Examples 2, 4 and 5 that the additive for asphalt of the present invention is far superior to oil or wax in reducing the viscosity of the asphalt mixture.

Further, it is clear from Table 3 or Table 4 that the asphalt mixture containing the additive for asphalt of the present invention is excellent in both Marshall stability indicating the stability of the asphalt mixture and loss rate indicating the grip strength of the aggregate.

Claims (14)

An additive for asphalt containing a compound represented by formula (1) or a salt thereof, [wherein, n and m are each independently an integer from 1 to 20, l is an integer from 1 to 4, and p and q are each independently 0 or 1, and A ¹ and A ² independently represent -CO-, -CH ₂ - , -O-, -CO ₂ -, or -OCO _- , R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may also be bonded. Form a ring structure]. The additive for asphalt according to claim 1, wherein the compound represented by the above formula (1) or a salt thereof is a compound represented by the formula (3) or a salt thereof, [wherein, n and m are each independently an integer from 1 to 20, and p and q are each independently 0 or 1, and A ¹ and A ² independently represent -CO-, -CH ₂ -, -O-, -CO ₂ -, or -OCO-, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent, and R ² and R ³ may be bonded to each other to form a cyclic structure]. The additive for the bitumen of claim 1, wherein the compound represented by the above formula (1) or a salt thereof is a compound represented by the formula (4) or a salt thereof, or a compound represented by the formula (5) or a salt thereof, [wherein, t and u are each independently an integer of 2 to 6, and p and q are each independently 0 or 1, and R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group which may have a substituent. R ² and R ³ may also be bonded to form a cyclic structure]. The additive for asphalt according to claim 1, wherein the compound represented by the above formula (1) or a salt thereof is a compound represented by the formula (6) or a salt thereof, [wherein, t and u are each independently an integer of 2 to 6]. The additive for asphalt according to any one of claims 1 to 4, wherein the above salt is a carboxylate. The additive for asphalt according to any one of claims 1 to 5, which further comprises at least one oil selected from the group consisting of petroleum-based mixed oils and lubricating oils. The asphalt additive of claim 6, wherein the content of the compound represented by the formula (1) or a salt thereof is from 0.01 part by weight to 200 parts by weight based on 100 parts by weight of the oil. An additive for asphalt according to claim 6 or 7, which further comprises a surfactant. The additive for asphalt according to claim 8, wherein the content of the surfactant is from 0.01 part by weight to 100 parts by weight based on 100 parts by weight of the compound represented by the formula (1) or a salt thereof. An asphalt composition comprising the additive for asphalt according to any one of claims 1 to 9, and asphalt. The asphalt composition of claim 10, which contains 0.005 with respect to 100 parts by weight of the asphalt The compound represented by the formula (1) or a salt thereof in an amount of up to 20 parts by weight. An asphalt mixture for road paving comprising the asphalt composition and aggregate of claim 10 or 11. The asphalt mixture of claim 12, which is used for manufacturing and construction at a temperature of 100 to 300 °C. A surfacing body comprising the asphalt mixture for road paving as claimed in claim 12 or 13.