Additive for asphalt regeneration, method for regenerating waste asphalt, regenerated asphalt composition, and regenerated asphalt mixture

Abstract

To provide an additive for asphalt regeneration that is liquid at room temperature, easy to handle, and has a low content of mineral oil components. [Solution] An asphalt rejuvenation additive contains vegetable oil and polyalkyl methacrylate. A method for regenerating waste asphalt includes a mixing step of mixing the asphalt rejuvenation additive with recovered waste asphalt. The content of the asphalt rejuvenation additive in the regenerated asphalt composition is in the range of 1 to 15 mass%. The content of the asphalt rejuvenation additive in the regenerated asphalt mixture is in the range of 0.02 to 0.75 mass%.

Description

[Technical Field]

[0001] The present invention relates to an additive for asphalt regeneration, a method for regenerating waste asphalt, a regenerated asphalt composition, and a regenerated asphalt mixture. [Background technology]

[0002] Bituminous materials such as asphalts are widely used as road pavement materials. Asphalt mixtures are obtained by mixing asphalt with aggregate and various fillers and heating the mixture. Over time, these road pavement materials are affected by ultraviolet light, oxygen, and temperature, which causes oxidation and compositional changes in the asphalt in the asphalt mixture, resulting in a decrease in penetration and an increase in its softening point and viscosity. These deteriorations can lead to cracks in the road pavement surface and the scattering of crushed stone.

[0003] To address this issue, road pavement repair and re-laying are required, resulting in the generation of large amounts of waste asphalt mixture. The recovered waste asphalt mixture is washed, its particle size adjusted, and mixed with new asphalt mixture to be used as paving material. In this process, asphalt regeneration additives are used to restore the composition and properties of the waste asphalt.

[0004] Patent Document 1 discloses an asphalt regenerating additive composition containing two specific vacuum distilled oils, a vegetable oil, and a specific alkylbenzene and / or alkylnaphthalene. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-204549 Summary of the Invention [Problem to be solved by the invention]

[0006] The mineral oil components contained in conventional asphalt regeneration additives have high melting points and are solid at room temperature, making them difficult to handle. Furthermore, their production requires a large amount of energy.

[0007] The problem to be solved by the present invention is to provide an additive for asphalt regeneration that is liquid at room temperature, easy to handle, and has a low content of mineral oil components. [Means for solving the problem]

[0008] The present inventors have conducted extensive research in light of the above-mentioned problems and have found that an asphalt regeneration additive containing vegetable oil and polyalkyl methacrylate is liquid at room temperature, easy to handle, and has a low mineral oil content. The present invention was completed based on these findings.

[0009] The present invention relates to vegetable oil , mineral oil and polyalkyl methacrylate The content of the mineral oil in the asphalt regeneration additive is in the range of 5 to 20 mass % and is liquid at room temperature. This relates to additives for asphalt reclamation.

[0010] The copolymerization ratio of alkyl methacrylate in the polyalkyl methacrylate is preferably in the range of 50 to 100 mol %.

[0011] The alkyl methacrylate preferably comprises methyl methacrylate.

[0012] The vegetable oil preferably comprises palm oil.

[0013] The present invention relates to a method for regenerating waste asphalt, comprising a mixing step of mixing the asphalt regeneration additive with recovered waste asphalt.

[0014] The content of the asphalt regeneration additive in the reclaimed asphalt composition is preferably in the range of 1 to 15 mass %.

[0015] The present invention relates to a recycled asphalt composition, in which the content of the asphalt regeneration additive in the recycled asphalt composition is in the range of 1 to 15 mass %.

[0016] The present invention further relates to a recycled asphalt mixture, in which the content of the additive for asphalt regeneration in the recycled asphalt mixture is in the range of 0.02 to 0.75 mass %. [Effects of the Invention]

[0017] The asphalt regeneration additive of the present invention is liquid at room temperature and easy to handle. Furthermore, since the asphalt regeneration additive of the present invention has a low mineral oil content, it contributes to reducing carbon emissions. In other words, the vegetable oil contained in the asphalt regeneration additive of the present invention contributes to achieving carbon neutrality. The waste asphalt regeneration method of the present invention provides a method for regenerating waste asphalt using the asphalt regeneration additive. The regenerated asphalt composition and regenerated asphalt mixture of the present invention contain the asphalt regeneration additive and recovered waste asphalt. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will now be described in further detail.

[0019] Unless otherwise specified, the symbol "to" in a numerical range indicates a range from above to below, and both ends of the range are included. Furthermore, when a numerical range is indicated, the upper and lower limits can be combined as appropriate, and the resulting numerical range is also considered to be disclosed.

[0020] In this specification, when a substituent has a dissociable hydrogen atom (a group in which the hydrogen atom dissociates upon the action of a base), this substituent includes the form of an ion or a salt.

[0021] In this specification, substituents, linking groups, etc. (hereinafter referred to as "substituents, etc.") that are not specified as substituted or unsubstituted mean that the group may have an appropriate substituent. Therefore, even when the specification simply states "group" (e.g., "alkyl group"), this "group" (e.g., "alkyl group") encompasses not only an embodiment that does not have a substituent (e.g., "unsubstituted alkyl group"), but also an embodiment that further has a substituent (e.g., "substituted alkyl group"). This also applies to compounds that are not specified as substituted or unsubstituted. Preferred substituents include the substituent T described below.

[0022] In the present specification, when the term "substituent" is simply used, a substituent selected from the substituent T described below is preferably applied.

[0023] In this specification, when there are multiple substituents, etc., designated by a specific symbol, or when multiple substituents, etc., are simultaneously or alternatively defined, this means that the respective substituents, etc., may be the same or different from each other. Furthermore, even if not otherwise specified, when multiple substituents, etc., are adjacent, they may be linked to each other or condensed to form a ring.

[0024] In this specification, when a polymer has multiple components with the same designation (represented by the same general formula), the components may be the same or different from each other.

[0025] <Asphalt reclamation additive> (vegetable oil) The asphalt regeneration additive of the present invention contains vegetable oil. The vegetable oil may contain edible oils and fats. The edible oils and fats are typical edible oils and fats used in the food industry. Examples of the edible oils and fats include rapeseed oil, soybean oil, sunflower oil, cottonseed oil, peanut oil, rice oil, corn oil, safflower oil, olive oil, kapok oil, sesame oil, perilla oil, linseed oil, evening primrose oil, palm oil, shea butter, sal fat, cocoa butter, coconut oil, palm kernel oil, palm olein, and waste vegetable oil. Processed vegetable oils and fats obtained by subjecting the vegetable oils to at least one of deep hydrogenation, fractionation, and interesterification may also be used. These oils and fats may be used alone or in combination. Among these, the edible oils and fats preferably include palm oil, rapeseed oil, soybean oil, palm kernel oil, and at least one of these processed oils and fats, more preferably palm oil, and even more preferably palm oil. The iodine value of palm oil is preferably 56 to 72, more preferably 60 to 72, from the viewpoint of maintaining a liquid state at room temperature.

[0026] (Polyalkyl methacrylate) The asphalt regeneration additive of the present invention contains a polyalkyl methacrylate. The polyalkyl methacrylate may be a copolymer. The copolymerization ratio of the alkyl methacrylate in the polyalkyl methacrylate is preferably in the range of 50 to 100 mol%, more preferably in the range of 70 to 100 mol%, and even more preferably 100 mol%.

[0027] The alkyl group of the alkyl methacrylate, which is a structural unit of the polyalkyl methacrylate, preferably has a carbon number of 1 to 36, more preferably 1 to 18, still more preferably 1 to 6, and particularly preferably 1 to 3. Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, and hexyl.

[0028] As described above, the alkyl group may have a substituent T. Examples of the substituent T include the following.

[0029] Alkenyl groups (preferably alkenyl groups having 2 to 20 carbon atoms, for example, vinyl, allyl, oleyl, etc.), alkynyl groups (preferably alkynyl groups having 2 to 20 carbon atoms, for example, ethynyl, butadiynyl, phenylethynyl, etc.), cycloalkyl groups (preferably cycloalkyl groups having 3 to 20 carbon atoms, for example, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, etc.), aryl groups (preferably aryl groups having 6 to 26 carbon atoms, for example, phenyl, 1-naphthyl, 4-methoxyphenyl, etc.), heterocyclic groups (preferably heterocyclic groups having 2 to 20 carbon atoms, more preferably 5- or 6-membered heterocyclic groups having at least one oxygen atom, sulfur atom or nitrogen atom. Heterocyclic groups include aromatic heterocyclic groups and aliphatic heterocyclic groups. For example, a tetrahydropyran ring group, a tetrahydrofuran ring group, 2-pyridyl, 4-pyridyl, 2-imidazolyl, 2-benzimidazolyl, 2-thiazolyl, 2-oxazolyl, etc.), alkoxy groups (preferably Alkoxy groups such as methoxy, ethoxy, isopropyloxy, and benzyloxy), aryloxy groups (preferably aryloxy groups having 6 to 26 carbon atoms, such as phenoxy, 1-naphthyloxy, 3-methylphenoxy, and 4-methoxyphenoxy), heterocyclic oxy groups (groups in which an -O- group is bonded to the above heterocyclic groups), alkoxycarbonyl groups (preferably alkoxycarbonyl groups having 2 to 20 carbon atoms, such as ethoxycarbonyl and 2-ethylhexyloxycarbonyl), and aryloxycarbonyl groups. (preferably an aryloxycarbonyl group having 6 to 26 carbon atoms, for example, phenoxycarbonyl, 1-naphthyloxycarbonyl, 3-methylphenoxycarbonyl, 4-methoxyphenoxycarbonyl, etc.), amino group (preferably an amino group having 0 to 20 carbon atoms, including an alkylamino group and an arylamino group, for example, amino (-NH), N,N-dimethylamino, N,N-diethylamino, N-ethylamino, anilino, etc.), sulfamoyl group (preferably a sulfamoyl group having 0 to 20 carbon atoms, for example, N,N-dimethylsulfamoyl, N-phenylsulfamoyl, etc.), acyl groups (including alkylcarbonyl groups, alkenylcarbonyl groups, alkynylcarbonyl groups, arylcarbonyl groups, and heterocyclic carbonyl groups, preferably acyl groups having 1 to 20 carbon atoms, for example, acetyl, propionyl, butyryl, octanoyl, hexadecanoyl, acryloyl, methacryloyl, crotonoyl, benzoyl, naphthoyl, and nicotinoyl), acyloxy groups (alkylcarbonyloxy groups, alkenylcarbonyloxy groups, alkynylcarbonyloxy groups, arylcarbonyl groups, etc.), Examples of such groups include aryloxy groups and heterocyclic carbonyloxy groups, and are preferably acyloxy groups having 1 to 20 carbon atoms, such as acetyloxy, propionyloxy, butyryloxy, octanoyloxy, hexadecanoyloxy, acryloyloxy, methacryloyloxy, crotonoyloxy, benzoyloxy, naphthoyloxy, and nicotinoyloxy; aryloyloxy groups (preferably aryloyloxy groups having 7 to 23 carbon atoms, such as benzoyloxy); carbamoyl groups (preferably carbamoyl groups having 1 to 20 carbon atoms, such as N,N-dimethylcarbamoyl, N-phenylcarbamoyl, etc.), acylamino groups (preferably acylamino groups having 1 to 20 carbon atoms, for example, acetylamino, benzoylamino, etc.), alkylthio groups (preferably alkylthio groups having 1 to 20 carbon atoms, for example, methylthio, ethylthio, isopropylthio, benzylthio, etc.), arylthio groups (preferably arylthio groups having 6 to 26 carbon atoms, for example, phenylthio, 1-naphthylthio, 3-methylphenylthio, 4-methoxyphenylthio, etc.), heterocyclic thio groups (groups in which an -S- group is bonded to the above heterocyclic groups), alkylsulfonyl groups (preferably or alkylsulfonyl groups having 1 to 20 carbon atoms, for example, methylsulfonyl, ethylsulfonyl, etc.), arylsulfonyl groups (preferably arylsulfonyl groups having 6 to 22 carbon atoms, for example, benzenesulfonyl, etc.), alkylsilyl groups (preferably alkylsilyl groups having 1 to 20 carbon atoms, for example, monomethylsilyl, dimethylsilyl, trimethylsilyl, triethylsilyl, etc.), arylsilyl groups (preferably arylsilyl groups having 6 to 42 carbon atoms, for example, triphenylsilyl, etc.), phosphoryl groups (preferably phosphate groups having 0 to 20 carbon atoms, for example, -OP(=O)(R, P )2), a phosphonyl group (preferably a phosphonyl group having 0 to 20 carbon atoms, for example, —P(═O)(R P )2), a phosphinyl group (preferably a phosphinyl group having 0 to 20 carbon atoms, for example, —P(R P ) 2), sulfo group (sulfonic acid group), carboxy group, hydroxy group, sulfanyl group, cyano group, halogen atom (e.g., fluorine atom, chlorine atom, bromine atom, iodine atom, etc.). P is a hydrogen atom or a substituent (preferably a group selected from the substituent T).

[0030] Each of these groups exemplified as the substituent T may further have the substituent T as a substituent.

[0031] The viscosity range of the asphalt regeneration additive of the present invention is preferably 80 to 1000 mm at 60°C. 2 / s range, more preferably 80-100 mm2 The contents of the vegetable oil, polyalkyl methacrylate, and auxiliary materials described below are preferably adjusted appropriately so that the viscosity falls within the above range.

[0032] <Secondary material> The asphalt rejuvenation additive of the present invention may contain an alkyl methacrylate which may be contained in a polyalkyl methacrylate.

[0033] The asphalt rejuvenation additive of the present invention may contain common auxiliary materials contained in conventional asphalt rejuvenation additives, such as mineral oil, esters, and bitumen. The mineral oil content in the asphalt rejuvenation additive of the present invention is preferably 5 to 20 mass%, more preferably 6 to 15 mass%, and particularly preferably 7 to 12 mass%. The mineral oil content in the asphalt rejuvenation additive of the present invention is lower than the mineral oil content in conventional asphalt rejuvenation additives. Furthermore, the asphalt rejuvenation additive of the present invention preferably does not contain bitumen.

[0034] <Application of additives for asphalt reclamation> The asphalt regeneration additive of the present invention and recovered waste asphalt are mixed and stirred to produce the recycled asphalt composition of the present invention. The content of the asphalt regeneration additive in the recycled asphalt composition is preferably 1 to 15 mass%, more preferably 5 to 12 mass%. The recycled asphalt composition of the present invention is used as a road paving material. The content of the asphalt regeneration additive specified here is the value when the design penetration of the waste asphalt is set to 40 to 100. If the design penetration is smaller than the above range, the content of the asphalt regeneration additive may be reduced below the above range. If the design penetration is larger than the above range, the content of the asphalt regeneration additive may be increased above the above range.

[0035] The recycled asphalt composition is obtained by mixing waste asphalt with an additive for asphalt recycling, and is in a state in which the penetration of the waste asphalt has been restored, and does not contain aggregates or the like.

[0036] The recycled asphalt mixture is obtained by mixing waste asphalt, the asphalt regeneration additive, new asphalt, aggregate, and filler as materials. The recycled asphalt mixture is in a state in which the penetration of the waste asphalt has been restored and contains aggregate, etc. The content of the asphalt regeneration additive in the recycled asphalt mixture of the present invention is in the range of 0.02 to 0.75 mass%. [Example]

[0037] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0038] In the examples and comparative examples, various physical properties were measured or calculated as follows.

[0039] <Asphalt penetration test> The asphalt penetration of each sample was measured three times in accordance with JIS K 2207 (test conditions: 25°C, 100g, 5 seconds), and the average value was calculated.

[0040] [Examples 1 to 3 and Comparative Example 1] An asphalt rejuvenation additive was prepared by mixing 83% by mass of Indonesian palm oil (Bimoli, manufactured by PT Indofood Sukses Makmur Tbk), 15% by mass of mineral oil (Sunlube 1703, manufactured by Sanyo Chemical Industries, Ltd.) in which methyl methacrylate copolymer A had been dissolved, and a mixture of methyl methacrylate copolymer B and an ester (FUNCTIONAL PD-571, manufactured by Functional Products, Inc.). The asphalt rejuvenation additive had the composition shown in Table 1. The asphalt rejuvenation additive was liquid at room temperature, making it easy to handle, and had a low mineral oil content.

[0041] [Table 1]

[0042] The asphalt regeneration additive was mixed with the waste asphalt in a heated and molten state at the content shown in Table 2, and the mixture was stirred to regenerate the waste asphalt. The penetration of each of the resulting regenerated asphalt compositions was measured to confirm the regeneration effect. The results are shown in Table 2.

[0043] [Table 2]

[0044] As a result of mixing a specified amount of an asphalt regeneration additive containing palm oil and a methyl methacrylate copolymer with the recovered waste asphalt shown in Comparative Example 1, the penetration of the waste asphalt was restored according to the amount added, as shown in Examples 1 to 3.

Claims

1. Contains vegetable oil, mineral oil and polyalkyl methacrylate, The content of the mineral oil in the asphalt regeneration additive is in the range of 5 to 20 mass %, and the asphalt regeneration additive is liquid at room temperature.

2. 2. The asphalt regeneration additive according to claim 1, wherein the copolymerization ratio of alkyl methacrylate in the polyalkyl methacrylate is in the range of 50 to 100 mol%.

3. 10. The asphalt rejuvenating additive of claim 1, wherein the alkyl methacrylate comprises methyl methacrylate.

4. 10. The asphalt rejuvenating additive of claim 1, wherein the vegetable oil comprises palm oil.

5. A method for regenerating waste asphalt, comprising a mixing step of mixing the asphalt regeneration additive according to any one of claims 1 to 4 with recovered waste asphalt.

6. The method for regenerating waste asphalt according to claim 5, wherein the content of the asphalt regeneration additive in the regenerated asphalt composition obtained through the mixing step is in the range of 1 to 15% by mass. A method for regenerating waste asphalt.

7. A recycled asphalt composition, wherein the content of the asphalt regeneration additive described in any one of claims 1 to 4 in the recycled asphalt composition is in the range of 1 to 15 mass%.

8. A recycled asphalt mixture, wherein the content of the asphalt regeneration additive described in any one of claims 1 to 4 in the recycled asphalt mixture is in the range of 0.02 to 0.75 mass%. Recycled asphalt mixture.

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