JP4036374B2 - Recycle additive composition for asphalt pavement waste - Google Patents

Description

  The present invention relates to a paving asphalt regeneration additive. Specifically, asphalt regeneration is excellent in safety to the environment and the human body, and has the ability to recover the hardened asphalt contained in pavement waste materials to the initial softness, that is, the ability to restore reduced penetration and elongation. It relates to an additive composition.

  To recycle pavement waste, mix pavement waste, new aggregate, and new asphalt with a mixer at the asphalt mixture factory, and the penetration and elongation of asphalt hardened due to deterioration contained in the pavement waste. In order to restore the initial softness, a method for regenerating degraded asphalt by adding an asphalt regeneration additive has been performed. This asphalt regeneration additive uses mineral oil with high aromaticity, for example, extract oil obtained from the solvent extraction process of petroleum refining, for the purpose of supplementing aromatic components in asphalt lost due to deterioration. Is the current situation (see, for example, Patent Documents 1 and 2).

Such mineral oil with high aromaticity compensates for the aromatic component in the deteriorated asphalt, and therefore has a high ability to recover the penetration and elongation greatly reduced due to deterioration. In particular, in order to greatly recover the elongation, the added mineral oil is required to have high aromaticity. However, since mineral oils with high aromaticity contain a large amount of polycyclic aromatics (PCA), there is a heavy burden on the environment and the human body, and there is a demand for the development of an asphalt regeneration additive that is currently safe for the environment and human body. Is high.
Japanese Patent Laid-Open No. 02-091303 JP 08-333515 A

  There is a need for an asphalt regeneration additive that is excellent in safety to the environment and the human body, and that recovers hardened asphalt contained in pavement waste to its original softness, that is, greatly reduces the reduced penetration and elongation. ing.

  As a result of intensive research on the above problems, the present inventors confirmed that the fatty acid alkyl ester compound has the ability to greatly recover the penetration and elongation of degraded asphalt, and the safety to the environment and the human body is improved. It has been found that a high-performance asphalt regeneration additive composition can be obtained that is high and can greatly improve the penetration and elongation of deteriorated asphalt in paving waste, and has led to the completion of the present invention. .

That is, the first of the present invention is a composition obtained by blending mineral oil and a fatty acid alkyl ester compound having a kinematic viscosity at 40 ° C. of 300 to 900 mm ² / s and a polycyclic aromatic content (PCA) of less than 3% by mass. An asphalt regeneration additive composition having a kinematic viscosity at 40 ° C. of 40 to 400 mm ² / s, a polycyclic aromatic content (PCA) of less than 3% by mass, and a flash point of 210 ° C. or higher. Related to things.

  The second aspect of the present invention is the first asphalt regeneration additive composition of the present invention, wherein the blending ratio of mineral oil and fatty acid alkyl ester compound is 60 to 90% by mass of mineral oil, 40 to 10% by mass of fatty acid alkyl ester compound (total). 100% by mass).

  A third aspect of the present invention is a saturated fatty acid, an unsaturated fatty acid, or a mixture thereof, wherein the fatty acid portion of the fatty acid alkyl ester compound has 3 to 18 carbon atoms in the first and second asphalt regeneration additive compositions of the present invention. It is characterized by being.

  A fourth aspect of the present invention is characterized in that in the first to third asphalt regeneration additive compositions of the present invention, the fatty acid alkyl ester compound is made from animal oil or vegetable oil.

  A fifth aspect of the present invention is characterized in that, in the first to third asphalt regeneration additive compositions of the present invention, the fatty acid alkyl ester compound is made from a waste oil of animal oil or vegetable oil. is there.

  The asphalt regeneration additive composition of the present invention is excellent in safety to the environment and the human body, and has a high ability to regenerate the asphalt that has been hardened due to deterioration contained in pavement waste, so that the penetration and elongation are large. Can be recovered.

Hereinafter, the present invention will be described in detail.
(Kinematic viscosity of mineral oil)
The kinematic viscosity at 40 ° C. of the mineral oil according to the present invention needs to be 300 to 900 mm ² / s. When the kinematic viscosity at 40 ° C. is lower than 300 mm ² / s, the light fraction is increased. Therefore, when making an asphalt pavement mixture, white smoke is undesirably generated when it comes into contact with high-temperature aggregate. On the other hand, when the kinematic viscosity at 40 ° C. exceeds 900 mm ² / s, the fluidity is lowered and handling properties are deteriorated, and a large amount of mineral oil is required to recover the penetration and elongation. It is not preferable. For this reason, the lower limit of the kinematic viscosity at 40 ° C. is preferably 350 mm ² / s or more, and more preferably 400 mm ² / s or more. The upper limit is preferably 800 mm ² / s or less, more preferably 700 mm ² / s.
Here, the kinematic viscosity at 40 ° C. means a kinematic viscosity (mm ² / s) measured by JIS K2283 “Crude oil and petroleum products—Kinematic viscosity test method and viscosity index calculation method”.

(Content of polycyclic aromatics in mineral oil)
The polycyclic aromatic content (PCA) in the mineral oil according to the present invention needs to be less than 3% by mass. If the PCA in the mineral oil is 3% by mass or more, the load on the environment and the human body may increase, such being undesirable. For this reason, PCA is preferably less than 2.8% by mass, more preferably less than 2% by mass, and even more preferably less than 1% by mass. If it says further, less than 0.3 mass% is especially preferable.
The polycyclic aromatics (PCA) here refers to “The Institute of Petroleum” IP346 / 92 “Determination of polycyclic aromatics in unused lubricant base oils and asphaltene free petroleum fractions-Dimethyl sulphoxide extraction refractive index method”. It means the content (% by mass) of the polycyclic aromatic hydrocarbon compound obtained according to the method.

(The flash point of mineral oil)
The flash point of the mineral oil according to the present invention is preferably 220 ° C. or higher. When the flash point of mineral oil is less than 210 ° C., the safety during production of the asphalt pavement mixture is lowered, which is not preferable. For this reason, the flash point is more preferably 230 ° C. or higher, and further preferably 250 ° C. or higher. The flash point here means the flash point (° C.) measured by the Cleveland open-type flash point test method of JIS K2265 “Crude oil and petroleum products—Flash point test method”.

(Mineral oil density)
The density of the mineral oil according to the present invention at 15 ° C. is preferably 0.88 to 0.95 / cm ³ . If the density of the mineral oil at 15 ° C. is less than 0.88 g / cm ³ , since it contains a lot of light components, white smoke is likely to be generated during the regeneration of the paving waste, which is not preferable. Therefore, the lower limit of the density is more preferably 0.90 g / cm ³ or more. On the other hand, if the upper limit of the density exceeds 0.95 g / cm ³ , the ratio of the aromatic component is high, PCA may be 3% by mass or more, and the load on the environment and the human body increases. For this reason, 0.94 g / cm ³ or less is more preferable.
In addition, the density here means the density (g / cm ³ ) at 15 ° C. measured by JIS K2249 “Crude oil and petroleum products—density test method”.

(% CA of mineral oil)
The% CA of the mineral oil according to the present invention is preferably less than 20%. If% CA is 20% or more, PCA may be 3% by mass or more, which increases the load on the environment and the human body. For this reason, it is more preferably 18% or less, and further preferably 15% or less.
The% CA here means the percentage of the number of aromatic ring carbons to the total number of carbons measured by ASTM D3238 “Standard Test Method for Calculation of Carbon Distribution and Structural Group Analysis of Petroleum Oils by the ndM Method” (% ).

(Aniline point of mineral oil)
The aniline point of the mineral oil according to the present invention is preferably 70 ° C. or higher. If the aniline point is less than 70 ° C., the PCA may be 3% by mass or more, which increases the load on the environment and the human body. For this reason, 80 ° C. or higher is more preferable, and 85 ° C. or higher is more preferable.
Here, the aniline point means an aniline point (° C.) measured by JIS K2256 “Petroleum product aniline point and mixed aniline point test method”.

(Change rate of heating mass of mineral oil)
The thin film heating mass change rate of the mineral oil according to the present invention is preferably −3.0 mass% or less (thin film heating loss is 3.0 mass% or less). When the thin film heating mass change rate exceeds −3.0 mass% (thin film heating loss exceeds 3.0 mass%), since it contains a large amount of light components, white smoke is likely to be generated during the regeneration of paving waste, which is not preferable. For this reason, −2.0 mass% or less (thin film heating loss is 2.0 mass% or less) is more preferable, and −1.0 mass% or less (thin film heating loss is 1.0 mass% or less) is more preferable. If it says further, -0.5 mass% or less (a thin film heating loss will be 0.5 mass% or less) is more preferable.
The thin film heating mass change rate here refers to the thin film heating mass change rate (mass%) measured by JIS K2207 “Petroleum Asphalt—Thin Film Heating Test Method”, and a negative value means a weight loss. .

(Mineral oil)
The crude oil used in producing the mineral oil of the present invention is not particularly limited, and examples thereof include paraffin-based crude oils such as Pencil Veneer crude oil, Minas crude oil, and Daqing crude oil, and naphthenic crude oils such as California crude oil, Texas crude oil, and Venezuela crude oil. Preferred are crude crude oil, mid-continuous crude oil, Arabic crude oil, Gucci Saran crude oil, Kafuji crude oil, Maya crude oil, neutral zone special crude oil, Foot crude oil, Kuwait crude oil, Rataway crude oil, Allian crude oil, Eosin crude oil, Solish crude oil and the like. Of these, mixed base crude oil and naphthene base crude oil are preferable.

  If the mineral oil of the present invention has a kinematic viscosity of 40 ° C. and the PCA content is in the above range, and the asphalt regeneration additive composition obtained by blending this with a fatty acid alkyl ester compound satisfies the predetermined properties, Although it is not particularly limited, it is possible to use a fraction that has been purified by appropriately combining solvent removal, solvent extraction, hydrocracking solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, clay treatment, and the like. In particular, the oil fraction obtained by distilling crude oil under reduced pressure is extracted with a solvent extraction such as furfural extraction using a furfural to remove aromatics and resin content in the oil fraction, and using liquid propane from the oil obtained by distillation under reduced pressure. Solvent dewaxing, such as MEK dewaxing, which removes wax using a solvent such as MEK, and hydrorefining A high-viscosity high-grade lubricating oil component (bright stock) or the like obtained by combining these is preferably used. Preferably, it is a high viscosity high-grade lubricating oil component (bright stock) obtained by processing mixed base crude oil and naphthenic base crude oil.

(Fatty acid alkyl ester compound)
As the fatty acid alkyl ester compound of the present invention, glyceride compounds (animal fats and vegetable fats and oils) composed of fatty acids and glycerin produced from animal lipid parts and plant seeds as raw materials are generally used as alcohols under an alkali catalyst. Examples thereof include a fatty acid alkyl ester mixture obtained by chemical reaction, and then separating and removing residual raw materials and by-products such as glycerin and catalyst. In the present invention, fatty acid alkyl ester compounds obtained by other chemical synthesis techniques can also be used.

Animal fats and oils include animal fats such as beef tallow, milk fat (butter), pork tallow, sheep fat, whale oil, fish oil, liver oil, etc., and vegetable fats and oils include coconut palm, palm palm, olive, Benibana, rapeseed ( Rape blossom), rice bran, sunflower, cottonseed, corn, soybeans, sesame seeds and other parts obtained from vegetable oils and the like. Moreover, in this invention, the waste fats and oils which used these animal fats and vegetable fats and oils for consumer use, industrial use, food use, etc. can also be used as a raw material after adding the removal process of miscellaneous matters.
It is preferable that the fatty acid part of the glyceride constituting these fats and oils is a saturated fatty acid having 3 to 18 carbon atoms, an unsaturated fatty acid having one or more unsaturated bonds, or a mixture thereof.

Examples of saturated fatty acids having 3 to 18 carbon atoms include butyric acid (C ₃ H ₇ COOH), caproic acid (C ₅ H ₁₁ COOH), caprylic acid (C ₇ H ₁₅ COOH), capric acid (C ₉ H ₁₉ COOH) ), Lauric acid (C ₁₁ H ₂₃ COOH), myristic acid (C ₁₃ H ₂₇ COOH), palmitic acid (C ₁₅ H ₃₁ COOH), stearic acid (C ₁₇ H ₃₅ COOH), and the like. Examples of unsaturated fatty acids having 3 to 18 carbon atoms include oleic acid (C ₁₇ H ₃₃ COOH), linoleic acid (C ₁₇ H ₃₁ COOH), linolenic acid (C ₁₇ H ₂₉ COOH), and ricinolenic acid (C ₁₇ H ₃₂ (OH) COOH) and the like. In general, the hydrocarbon portion of these fatty acids in natural substances is generally linear, but in the present invention, even a structure having a side chain, that is, an isomer can be used. Moreover, the position of the unsaturated bond in the molecule of the unsaturated fatty acid is not limited to those generally confirmed in nature in the present invention, but can also be used at any position set by chemical synthesis. .
The above-mentioned raw material fats and oils (animal fats and oils, vegetable fats and oils) have one or more of these fatty acid groups, and the fatty acids they have vary depending on the type of raw material fats and oils. For example, coconut oil has a relatively large amount of saturated fatty acids such as lauric acid and myristic acid, while rapeseed oil and soybean oil have a large amount of unsaturated fatty acids such as oleic acid and linoleic acid.

  The method for producing the fatty acid alkyl ester compound of the present invention is not particularly limited. As a typical example, stirring is performed at 70 ° C. for about 1 hour in the presence of an alkali metal (sodium methylate, caustic soda, etc.) Directly reacting to obtain ester compounds (transesterification reaction), and feed oil is hydrolyzed by high temperature and high pressure process (50-60 atm, 250-260 ° C, 2-3 hours, non-catalyst) to fatty acid and glycerin A method (esterification reaction) in which the fatty acid obtained by separation is reacted with an alcohol in the presence of an acid catalyst (sulfuric acid, paratoluenesulfonic acid, etc.) to obtain an ester compound.

Examples of the alcohol include methanol (CH ₃ OH), ethanol (C ₂ H ₅ OH), propanol (C ₃ H ₇ OH), butanol (C ₄ H ₉ OH), hexanol (C ₅ H ₁₁ OH), and the like. These isomers can also be used, but methanol and ethanol are preferably used mainly from the viewpoint of economy and property stabilization upon esterification.
Examples of the fatty acid methyl ester compound obtained by the above production method include butyric acid methyl ester (C ₃ H ₇ COOCH ₃ ), caproic acid methyl ester (C ₅ H ₁₁ COOCH ₃ ), and caprylic acid methyl ester (C ₇ H ₁₅ COOCH _3). ), Capric acid methyl ester (C ₉ H ₁₉ COOCH ₃ ), lauric acid methyl ester (C ₁₁ H ₂₃ COOCH ₃ ), myristic acid methyl ester (C ₁₃ H ₂₇ COOCH ₃ ), palmitic acid methyl ester (C ₁₅ H ₃₁₎ COOCH ₃ ), stearic acid methyl ester (C ₁₇ H ₃₅ COOCH ₃ ), oleic acid methyl ester (C ₁₇ H ₃₃ COOCH ₃ ), linoleic acid methyl ester (C ₁₇ H ₃₁ COOCH ₃ ), linolenic acid methyl ester (C _{1 7} H ₂₉ COOCH ₃ ), ricinolenic acid methyl ester (C ₁₇ H ₃₂ (OH) COOCH ₃ ) and the like, and as ethyl ester compounds, butyric acid ethyl ester (C ₃ H ₇ COOC ₂ H ₅ ), caproic acid ethyl ester (C ₅ H ₁₁ COOC ₂ H ₅ ), caprylic acid ethyl ester (C ₇ H ₁₅ COOC ₂ H ₅ ), capric acid ethyl ester (C ₉ H ₁₉ COOC ₂ H ₅ ), lauric acid ethyl ester (C ₁₁ H ₂₃₎ COOC ₂ H ₅ ), myristic acid ethyl ester (C ₁₃ H ₂₇ COOC ₂ H ₅ ), palmitic acid ethyl ester (C ₁₅ H ₃₁ COOC ₂ H ₅ ), stearic acid ethyl ester (C ₁₇ H ₃₅ COOC ₂ H ₅ ) , ethyl oleate _{(C 17} H 33 COOC _{2 5),} linoleic acid ethyl ester _{(C 17 H 31 COOC 2 H} 5), linolenic acid ethyl ester _{(C 17 H 29 COOC 2 H} 5), ricinoleic acid ethyl ester _{(C 17 H 32 (OH)} COOC 2 H 5) Etc. Moreover, when vegetable fats and oils are used for a raw material, a fatty-acid alkylester compound contains 1 type or multiple types of the above-mentioned ester compound.

Quantification of these fatty acid alkyl ester compounds and fatty acids in raw oils and fats can be performed using a gas chromatograph. Analytical conditions are shown below. By using a free fatty acid type column (FFAP), these substances can be easily and accurately quantified.
Column: FFAP (φ0.32mm × 25m)
Carrier gas: He (26 psi)
Detector: FID
Injection temperature: 280 ° C
Detector temperature: 300 ° C
Oven temperature: 100-260 ° C (10 minutes)
Temperature increase rate: 5 ° C./min Injection amount: 0.4 μL (methanol solution)

(Combination)
The asphalt regeneration additive composition of the present invention has a mineral oil blending ratio of 90 to 60 with respect to the total amount of the asphalt regeneration additive composition in order to sufficiently secure the regeneration ability of paving waste materials and further the ability of repeated regeneration. It is preferable that it is mass%. Moreover, it is preferable that the mixture ratio of the above-mentioned fatty-acid alkylester compound is 10-40 mass% with respect to the asphalt reproduction | regeneration additive composition whole quantity. Here, the sum total of mineral oil and a fatty-acid alkylester compound is 100 mass%. When the blending ratio of the fatty acid alkyl ester compound is less than 10% by mass, the elongation of the deteriorated asphalt in the pavement waste material cannot be sufficiently recovered depending on the mineral oil used. Is more preferable. On the other hand, when the blending ratio of the fatty acid alkyl ester compound exceeds 40% by mass, the amount of addition necessary to restore the penetration and elongation is extremely reduced. However, there is a concern that the asphalt pavement mixture may be regenerated unevenly and the flash point of the asphalt regeneration additive composition may be lower than 210 ° C. For this reason, the blending ratio of the fatty acid alkyl ester compound is preferably 35% by mass or less, and more preferably 30% by mass or less.

(Kinematic viscosity of regenerated additive composition)
The kinematic viscosity (40 ° C.) of the asphalt regeneration additive composition of the present invention needs to be 40 to 400 mm ² / s. When kinematic viscosity (40 degreeC) is 400 mm < ² > / s or more, the required addition amount for recovering the penetration of the degradation asphalt in a paving waste material becomes large, and the handleability on handling falls. On the other hand, when the kinematic viscosity (40 ° C.) is 40 mm ² / s or less, the amount of addition required for recovering the penetration and elongation of deteriorated asphalt in the paving waste material is extremely reduced. There is a concern that the regenerated additive does not spread uniformly over the deteriorated asphalt, resulting in a non-uniformly regenerated asphalt pavement mixture. For this reason, the kinematic viscosity (40 ° C.) of the asphalt regeneration additive composition of the present invention is preferably 50 mm ² / s or more, and more preferably 80 mm ² / s or more. On the other hand, the upper limit is preferably at most 350 mm ² / s, more preferably at most 300 mm ² / s.

(Flash point of regenerated additive composition)
The flash point of the asphalt regeneration additive composition of the present invention needs to be 210 ° C. or higher. When the flash point of the asphalt regeneration additive composition is less than 210 ° C., the safety during production of the asphalt pavement mixture decreases, which is not preferable. For this reason, the flash point is more preferably 220 ° C. or higher, and further preferably 230 ° C. or higher.
The flash point here means the flash point (° C.) measured by the Cleveland open-type flash point test method of JIS K2265 “Crude oil and petroleum products—Flash point test method”.

(Content of polycyclic aromatics in the regeneration additive composition)
The polycyclic aromatic content (PCA) of the asphalt regeneration additive composition of the present invention needs to be less than 3% by mass. If the PCA in the mineral oil is 3% by mass or more, the load on the environment and the human body may increase, such being undesirable. For this reason, PCA is preferably less than 2.8% by mass, more preferably less than 2% by mass, and even more preferably less than 1% by mass. If it says further, less than 0.2 mass% is especially preferable.
The polycyclic aromatics (PCA) here refers to “The Institute of Petroleum” IP346 / 92 “Determination of polycyclic aromatics in unused lubricant base oils and asphaltene free petroleum fractions-Dimethyl sulphoxide extraction refractive index method”. It means the content (% by mass) of the polycyclic aromatic hydrocarbon compound obtained according to the method.

(Thin film heating mass change rate of regeneration additive composition)
The thin film heating mass change rate of the asphalt regeneration additive composition of the present invention is preferably -3.0 mass% or less (thin film heating loss is 3.0 mass% or less). When the thin film heating mass change rate exceeds −3.0 mass% (thin film heating loss exceeds 3.0 mass%), since it contains a large amount of light components, white smoke is likely to be generated during the regeneration of paving waste, which is not preferable. For this reason, −2.0 mass% or less (thin film heating loss is 2.0 mass% or less) is more preferable, and −1.0 mass% or less (thin film heating loss is 1.0 mass% or less) is more preferable. If it says further, -0.5 mass% or less (a thin film heating loss will be 0.5 mass% or less) is more preferable.
The thin film heating mass change rate here refers to the thin film heating mass change rate (mass%) measured by JIS K2207 “Petroleum Asphalt—Thin Film Heating Test Method”, and a negative value means a weight loss. .

(Additive composition other than mineral oil and fatty acid alkyl ester compound)
The asphalt regeneration additive composition of the present invention, in addition to mineral oil and fatty acid alkyl ester compound, coconut palm, palm palm, olive, Benibana, rapeseed (rapeseed), rice bran, sunflower, Vegetable oils and fats obtained from cotton seeds, corn, soybeans, sesame seeds and other parts, beef tallow, milk lipids (butter), pork tallow, sheep fat, whale oil, fish oil, liver oil, and other animal fats and oils Oil from which animal oil is removed, waste oil in which vegetable oil is used for consumer use, industrial use, food use, butyric acid (C ₃ H ₇ COOH), caproic acid (C ₅ H ₁₁ COOH), caprylic acid (C ₇ H ₁₅ COOH), caprin Acid (C ₉ H ₁₉ COOH), Lauric acid (C ₁₁ H ₂₃ COOH), Myristic acid (C ₁₃ H ₂₇ COOH), Palmitic acid (C ₁₅ H ₃₁ COO) H), saturated fatty acid having a carbon number of 3 to 24 such as stearic acid _{(C 17} H 35 COOH), oleic acid _{(C 17} H 33 COOH), linoleic acid _{(C 17} H 31 COOH), linolenic acid _(C 17 _{H 29} COOH), may be added ricinoleic acid _{(C 17 H 32 (OH)} COOH) an unsaturated fatty acid having a carbon number of 3 to 24 such as one or more kinds.

(How to use regenerative additives)
The asphalt regeneration additive composition of the present invention can be used in both a plant regeneration method and a road regeneration method. In the plant regeneration method, regeneration is performed in a batch plant or a continuous plant, but the asphalt regeneration additive composition of the present invention can be used regardless of the type of these plants. A regenerated asphalt mixture can be produced by adding a predetermined amount of the asphalt regenerating additive composition of the present invention to a plant mixer for mixing aggregate, asphalt, and regenerated aggregate, and mixing. On the other hand, in the road regeneration method, there are a remix method and a repave method, but the asphalt regeneration additive composition of the present invention can be used regardless of these methods. That is, in the remix method, the asphalt regeneration additive composition of the present invention can be added to an existing surface mixture heated and loosened, and this and the new asphalt mixture can be mixed and spread and compacted. In addition, in the repebing method, the asphalt regeneration additive composition of the present invention is added to the existing surface mixture heated and cracked, and the mixture is stirred and laid, and then the new asphalt mixture is laid on the top and simultaneously compacted. be able to.

The amount of the asphalt regeneration additive composition of the present invention added to the paving waste is an amount necessary to restore the penetration and elongation of the deteriorated asphalt in the paving waste to desired values,
The amount is preferably 4 to 30 parts by weight with respect to 100 parts by weight of the deteriorated asphalt in the pavement waste material. When this amount is less than 4 parts by weight, the additive does not spread throughout the deteriorated asphalt, resulting in uneven regeneration. On the other hand, when the amount exceeds 30 parts by weight, the regeneration effect becomes excessive, and in particular, the penetration exceeds a desired value. For this reason, the preferred addition amount is 5 to 25 parts by weight, and more preferably 6 to 20 parts by weight.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited at all by these.

[Examples and Comparative Examples]
(Mineral oil)
Mineral oil includes bright stock (mineral oil A) obtained by processing mixed base crude oil, lubricating oil fraction (mineral oil B) obtained by processing naphthenic base crude oil, and furfural obtained by processing mixed base crude oil Three types of extract (mineral oil C) were used. Specifically, mineral oil A used Bright Stock manufactured by Nippon Oil Corporation. Mineral oil B used was Sankyo Yuka SNH440. Mineral oil C used was Aromax 3 from Fuji Kosan. Table 1 shows the properties of A, B, and C. The properties of the mineral oil were analyzed by the following method.
The density (15 ° C.) refers to the density (g / cm ³ ) at 15 ° C. measured by JIS K2249 “Crude oil and petroleum products—Density test method”.
The flash point (COC) refers to the flash point (° C.) measured by the Cleveland open-type flash point test method of JIS K2265 “Crude oil and petroleum products—flash point test method”.
The kinematic viscosity (40 ° C., 60 ° C., 100 ° C.) is the kinematic viscosity at 40 ° C., 60 ° C., and 100 ° C. (mm ² / s).
The aniline point refers to the aniline point (° C.) measured by JIS K2256 “Petroleum product aniline point and mixed aniline point test method”.
% CP,% CN and% CA are paraffin, naphthene ring and aromatic ring carbon for all carbon numbers measured by ASTM D3238 “Standard Test Method for Calculation of Carbon Distribution and Structural Group Analysis of Petroleum Oils by the ndM Method” respectively. Refers to the percentage (%) of the number.
PCA content is polycyclic aromatic carbonization obtained in accordance with “The Institute of Petroleum” IP346 / 92 “Determination of polycyclic aromatics in unused lubricating base oils and asphaltene free petroleum fractions-Dimethyl sulphoxide extraction refractive index method” It refers to the content (% by mass) of the hydrogen compound.
Thin film heating mass change rate refers to the thin film heating mass change rate (mass%) measured by JIS K2207 “Petroleum Asphalt-Thin Film Heating Test Method”. A positive value indicates an increase in mass and a negative value indicates a decrease in mass. means.

(Fatty acid alkyl ester compound)
For the production of the fatty acid alkyl ester compound, three kinds of rapeseed oil, soybean oil, used salad oil (waste cooking oil) mainly composed of rapeseed oil and soybean oil were used. Each oil and fat is heated to 70 ° C., sodium methoxide (MeONa) obtained from sodium hydroxide and methanol is added, stirred for 1 hour, allowed to stand, separated and removed from glycerin, and purified by distillation under reduced pressure. To obtain a fatty acid alkyl ester (transesterification reaction). Table 2 shows the composition of the fatty acid alkyl ester compound used in the present invention.
The fatty acid composition of the fat was analyzed by gas chromatography using the above-mentioned free fatty acid type column (FFAP).

(Asphalt regeneration additive)
The above mineral oil and fatty acid alkyl ester compound were mixed at a predetermined weight ratio and stirred and mixed at 60 ° C. for 15 minutes to obtain uniform asphalt regeneration additive composition: Additives 1-9. Table 3 shows the mixing ratio and the properties after mixing.
The PCA content of Comparative Example 4 (Additive 9) is very high at 20.5% by mass, and exceeds 3% by mass. Therefore, the load on the environment and the human body is high, and safety may be a concern. I understand.
The properties of the asphalt regeneration additive composition shown in Table 3 were analyzed by the following method.
The density (15 ° C.) refers to the density (g / cm ³ ) at 15 ° C. measured by JIS K2249 “Crude oil and petroleum products—Density test method”.
The flash point (COC) refers to the flash point (° C.) measured by the Cleveland open-type flash point test method of JIS K2265 “Crude oil and petroleum products—flash point test method”.
Kinematic viscosity (40 ℃, 60 ℃, 100 ℃) is JIS K2283 - 40 ° C. as measured by the "Crude petroleum and petroleum products kinematic viscosity and calculation of viscosity index", 60 ° C., a kinematic viscosity at 100 ℃ (mm ² / s).
The mass change rate after the thin film heating test refers to the thin film heating mass change rate (% by mass) measured by JIS K2207 “Petroleum Asphalt-Thin Film Heating Test Method”. A positive value indicates an increase in mass and a negative value indicates a mass. Means weight loss.
The kinematic viscosity ratio (60 ° C.) after the thin film heating test is the kinematic viscosity at 60 ° C. of the sample after testing in accordance with JIS K2207 “Petroleum Asphalt—Thin Film Heating Test Method”. The value divided by the kinematic viscosity at
PCA content is polycyclic aromatic carbonization obtained in accordance with “The Institute of Petroleum” IP346 / 92 “Determination of polycyclic aromatics in unused lubricating base oils and asphaltene free petroleum fractions-Dimethyl sulphoxide extraction refractive index method” It refers to the content (% by mass) of the hydrogen compound.

(Deteriorated asphalt)
After testing straight asphalt with a penetration of 70 in a thin film heating test at 163 ° C. for 5 hours,
Furthermore, deteriorated asphalt was obtained by the pressure accelerated deterioration test proposed by US SHRP. That is, the test was conducted for 20 hours under the conditions of a temperature of 100 ° C. and an air pressure of 2.07 MPa to obtain deteriorated asphalt. Table 4 shows the properties of the deteriorated asphalt.
The penetration (25 ° C.) refers to the penetration measured according to JIS K2207 “Petroleum Asphalt—Penetration Test Method”.
The softening point refers to a softening point (° C.) measured according to JIS K2207 “Petroleum Asphalt—Softening Point Test Method”.
Elongation (15 ° C.) refers to the elongation at 15 ° C. measured by JIS K2207 “Petroleum Asphalt—Elongation Test Method”.

(Examples 1-5, Comparative Examples 1-3)
Additives 1 to 8 were added to the deteriorated asphalt in the heat-melted state so that the target penetration was 70, and the mixture was stirred and regenerated. The physical properties of the obtained recycled asphalt were measured, and the regeneration effect was confirmed. Table 5 shows the properties of the recycled asphalt. The properties of recycled asphalt were analyzed by the following method. Note that the flash point (COC), toluene soluble content, and penetration ratio after the evaporation test not listed in Table 5 all satisfy the standards of straight asphalt for road paving established by the Japan Road Association shown in Table 6. It was a thing.
The density refers to the density (g / cm ³ ) converted to 15 ° C. measured by JIS K2207 “Petroleum Asphalt—Density Test Method”.
The penetration (25 ° C.) refers to the penetration measured according to JIS K2207 “Petroleum Asphalt—Penetration Test Method”.
The softening point refers to a softening point (° C.) measured according to JIS K2207 “Petroleum Asphalt—Softening Point Test Method”.
The elongation (15 ° C.) refers to the elongation at 15 ° C. measured by JIS K2207 “Petroleum Asphalt—Elongation Test Method”.
The penetration residual rate after the thin film heating test refers to the percentage (%) of the penetration after the thin film heating measured by JIS K2207 “Petroleum Asphalt—Thin Film Heating Test Method” with respect to the original penetration.
Thin film heating mass change rate refers to thin film heating mass change rate (% by mass) measured by JIS K2207 “Petroleum Asphalt-Thin Film Heating Test Method”. Positive value indicates mass increase, negative value indicates mass decrease. means.

The asphalt properties after regeneration in Examples 1 to 5 all satisfied the standards of straight asphalt for road paving established by the Japan Road Association shown in Table 6.
Since the additive 6 of Comparative Example 1 does not contain a fatty acid alkyl ester compound, the asphalt elongation after regeneration is as small as 50 cm, and could not be regenerated into a sample that satisfies the standard of straight asphalt for road paving established by the Japan Road Association. .
In Comparative Examples 2 and 3, Additives 7 and 8 were added to the deteriorated asphalt in a heated and melted state so that the target penetration was 70, and the mixture was stirred and regenerated. Since Additives 7 and 8 contained a fatty acid alkyl ester compound more than necessary, the amount required for regeneration was very small, and the additive did not reach the entire deteriorated asphalt and could only be regenerated unevenly. As a result, the penetration values of the regenerated samples varied greatly.

Claims (5)

A composition obtained by blending a mineral oil having a kinematic viscosity at 40 ° C. of 300 to 900 mm ² / s and a polycyclic aromatic content (PCA) of less than 3% by mass with a fatty acid alkyl ester compound, wherein the kinematic viscosity at 40 ° C. An asphalt regeneration additive composition having a viscosity of 40 to 400 mm ² / s, a polycyclic aromatic content (PCA) of less than 3% by mass, and a flash point of 210 ° C. or higher.   The asphalt regeneration additive composition according to claim 1, wherein the blending ratio of the mineral oil and the fatty acid alkyl ester compound is 60 to 90% by mass of mineral oil and 40 to 10% by mass (total 100% by mass) of the fatty acid alkyl ester compound. object.   The asphalt regeneration additive composition according to claim 1 or 2, wherein the fatty acid part of the fatty acid alkyl ester compound is a saturated fatty acid having 3 to 18 carbon atoms, an unsaturated fatty acid, or a mixture thereof.   The asphalt regeneration additive composition according to claims 1 to 3, wherein the fatty acid alkyl ester compound is derived from animal oil or vegetable oil.   The asphalt regeneration additive composition according to claim 1, wherein the fatty acid alkyl ester compound is a raw material of waste oil of animal oil or vegetable oil.