JP2006233130A - Particulate regenerative additive composition of asphalt binder for paving - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regenerative additive composition for drainage pavement which enables pelletization to small particles, excels in handling properties, and enables quick and uniform dispersion in an asphalt material-mixing plant, by the addition of an additive composition having low tack and being less prone to blocking. <P>SOLUTION: The regenerative additive composition for a deteriorated asphalt used in drainage pavement is obtained by compounding 100 pts.wt. heavy oil having a flash point of ≥240°C and an aromatic content (% CA) of 10-30% CA, 10-150 pts.wt. thermoplastic elastomer having a styrene content of 5-50 wt% and an MFR (200°C, 5 kg) of ≤40, and 10-40 pts.wt. synthetic wax having a molecular weight of 800-5,000, heat-mixing the resulting compound, and molding the obtained compound to pellets having a particle diameter of ≤50 mm. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a regeneration additive for an asphalt pavement generating material. Specifically, when producing asphalt mixture for drainage pavement using general pavement generation material and / or drainage pavement generation material, new aggregate and new asphalt binder, regenerate degraded asphalt adhering to the generated material. The present invention relates to a regenerative additive suitable for the purpose.

In recent years, effective use of pavement-generating materials has been promoted from the viewpoint of aggregate resources, waste disposal, or nature protection. In many cases, the pavement generating material is recycled to a straight asphalt mixture by adding petroleum heavy oil alone to the recycled aggregate.
On the other hand, a regenerative additive for regenerating degraded asphalt binder into high-viscosity asphalt binder for drainage paving has been proposed, characterized by containing petroleum heavy oil and thermoplastic elastomer as constituent components ( Patent Document 1).
The above proposal is useful as a method of recycling the pavement generating material into a drainage pavement mixture.
JP 2003-003071 A

  In the method described in Patent Document 1, since the regenerative additive to be added is a composition comprising a petroleum heavy oil and a thermoplastic elastomer, the regenerated additive composition obtained is semisolid or solid at room temperature. Since it has tackiness and blocking, it was difficult to form a pellet. For this reason, it has been unavoidable to use it as a lump or plate (300 to 300 grams) and put it in a polyethylene bag. Therefore, when producing the asphalt mixture using the generated material, the regenerative additive must be manually put into the mixture plant, and so-called handling property is poor.

Furthermore, the mixing time of the asphalt binder and the aggregate during the production of the asphalt mixture is usually as short as about 40 seconds to 2 minutes. In such a short time mixing, the regenerated addition with a large unit capacity such as a lump or plate In the form of the agent, short-time solubility is poor and mixing is insufficient. Therefore, when using the said regenerative additive, mixing time had to be lengthened, As a result, manufacture of asphalt compound material took time, and there existed a possibility of reducing productivity.
Therefore, conventionally, in order to avoid this, the regenerative additive is separately added to a heating kettle or the like first, and this is heated in advance to reduce its viscosity to ensure the mixing property in a short time. The operation was performed. For this reason, productivity and workability were bad.
Therefore, improvement of productivity and workability is demanded for conventional regeneration additives.
Here, in order to ensure the productivity and workability of the asphalt mixture, a technique of uniformly dispersing and mixing in a short time is important. Therefore, there has been a demand for a regenerative additive having good handling properties and good mixing properties with deteriorated asphalt binders and aggregates.
That is, this can be achieved by pelletizing the regenerative additive to reduce the particle size.

In order to solve the drawbacks and difficulties of the conventional regenerative additive, it is essential to reduce the tackiness of the regenerative additive and at the same time reduce the shape.
In other words, it becomes possible to pelletize by lowering the tackiness of the regenerated additive, thereby reducing the size and improving the compatibility and mixing properties with the deteriorated asphalt binder in the asphalt mixture plant, resulting in good quality It becomes possible to produce a recycled asphalt mixture for drainage pavement. Furthermore, handling performance is improved in these series of operations.
In order to solve the above problems, the regenerative additive composition of the present invention is tacky by blending synthetic wax as an essential component in addition to petroleum heavy oil and thermoplastic elastomer as a blending material. As a result, pelletization is possible.

That is, the first of the present invention is to regenerate a pavement generating material into a drainage pavement asphalt mixture, characterized by containing petroleum heavy oil, thermoplastic elastomer and synthetic wax as constituent components. It is a regeneration additive composition.
By blending a synthetic wax, the regenerative additive exhibits antiblocking properties, improves handling, and enables pelletization.
A second aspect of the present invention is characterized in that, in the first aspect of the present invention, 10 to 150 parts by weight of a thermoplastic elastomer and 10 to 40 parts by weight of a synthetic wax are contained with respect to 100 parts by weight of a petroleum heavy oil. A regenerative additive composition.
Such a blending amount is preferable for exhibiting anti-blocking properties.
A third aspect of the present invention is the regeneration additive composition according to the first or second aspect of the present invention, wherein the synthetic wax has a weight average molecular weight (Mw) of 800 to 5,000.
A synthetic wax having such a weight average molecular weight (Mw) is preferable for exhibiting antiblocking properties.
A fourth aspect of the present invention is a pellet having a molded diameter of 1 to 50 mm made of any one of the first to third regeneration additive compositions of the present invention.
Pellets with a size in the above range are suitable for mixing in an asphalt mixture plant, including handling properties.
5th of this invention is 1 to 3 of the reproduction | regeneration additive composition in any one of 1st to 3rd of this invention with respect to 100 weight part of deteriorated asphalt binders adhering to the reproduction | regeneration aggregate as a pavement generating material. It is a regenerated drainage pavement asphalt mixture that is 30 parts by weight heated and mixed.
In order to regenerate and recover the deteriorated asphalt binder adhering to the recycled aggregate to a practical range, it is appropriate that the regenerative additive is blended within the above range.

The regenerated additive composition of the present invention can be molded into a pellet form because of its anti-blocking property, and is excellent in handling without blocking during storage and transport. In addition, it is possible to quickly and uniformly disperse the asphalt mixture for reclaimed drainage pavement with a mixer in a mixture plant.
And by adding the regenerative additive composition of the present invention, the deteriorated asphalt binder attached to the regenerated aggregate obtained from the pavement generating material is substantially different from the modified asphalt as an asphalt binder for new drainage pavement. It becomes possible to recover and regenerate the same physical properties.
Thereby, effective use of the degraded pavement generating material generated in large quantities is achieved.

The present invention is described in detail below.
The regenerative additive composition of the present invention is composed of 10 to 150 parts by weight, preferably 15 to 120 parts by weight of a thermoplastic elastomer having a predetermined property described later, based on 100 parts by weight of a petroleum heavy oil having the predetermined property described later. And 10 to 40 parts by weight, preferably 15 to 35 parts by weight of a synthetic wax having the predetermined properties described below.
When the blending amount of the thermoplastic elastomer is less than 10 parts by weight with respect to 100 parts by weight of the petroleum heavy oil, the tackiness of the composition that can increase the ratio of the petroleum heavy oil in the regenerated additive composition is high. Even if it becomes high and cannot be pelletized, it is not preferable because it becomes easy to block even if pelletized.
On the other hand, when the blending amount of the thermoplastic elastomer exceeds 150 parts by weight, the proportion of petroleum heavy oil in the regeneration additive composition becomes low, and the asphalt binder hardened due to deterioration in the pavement generating material is softened. Since the effect is small, it is not preferable.
Moreover, when the compounding quantity of a synthetic wax is less than 10 weight part with respect to 100 weight part of petroleum heavy oil, since the reproduction | regeneration additive composition obtained becomes easy to block and cannot pelletize, it is unpreferable. On the other hand, when the compounding amount of the synthetic wax exceeds 40 parts by weight, the compatibility with the deteriorated asphalt binder and the novel asphalt binder is deteriorated, which is not preferable.

The petroleum heavy oil used in the regeneration additive composition of the present invention needs to have a flash point of 240 ° C. or higher. When the flash point is less than 240 ° C., the regenerated additive component is liable to evaporate at the time of manufacturing the asphalt mixture, and the steam causes white smoke, which is not preferable. For this reason, the flash point is preferably 250 ° C. or higher, and more preferably 260 ° C. or higher.
The heavy petroleum oil used in the regenerative additive composition of the present invention contains less than 3% by mass of condensed polycyclic aromatic (PCA) from the viewpoint of environmental impact and safety to the human body. Is preferred. Here, the condensed polycyclic aromatic content (PCA) to say, "The Institute of Petroleum" of IP346 / 92 "Determination of polycyclic aromatics in unused lubricating base oils and asphaltene free petroleum fractions - Dimethyl sulphoxide extraction refractive index method" method of Means the content (% by mass) of the polycyclic aromatic hydrocarbon compound measured according to the above.

In addition, the aromatic content (% CA) of the petroleum heavy oil used in the regeneration additive composition of the present invention needs to be 10 to 30% CA. The lower limit of the aromatic content is required to be 10% CA or more from the viewpoint of solubility and dispersibility of the thermoplastic elastomer in petroleum heavy oil, preferably 12% CA or more, and more preferably 15% CA or more. Is more preferable. On the other hand, the upper limit needs to be 30% CA or less because the reforming effect is reduced by increasing the solubility of the thermoplastic elastomer in petroleum heavy oil, and 25% CA or less is required. preferable.
Here, the aromatic content (% CA) refers to ASTM D3238 “Standard Test Method for Calculation of Carbon Distribution and Structural Group of Petroleum Oil M It means the percentage (%) of the number of aromatic ring carbons.

The kind of petroleum heavy oil used in the regeneration additive composition of the present invention is not particularly limited as long as the above properties are satisfied. For example, the crude oil used in producing the petroleum heavy oil used in the regenerative additive composition of the present invention is selected according to the type of petroleum heavy oil required, but Pencil Veneer crude oil, Minas crude oil, Daqing Paraffin-based crude oil such as crude oil, California crude oil, Texas crude oil, Venezuela crude oil and other naphthenic crude oil, mid-continuous crude oil, Arabian crude oil, Gucci Saran crude oil, Kafuji crude oil, Maya crude oil, neutral zone special crude oil, foot crude oil, Kuwait crude oil, Lataway crude oil In addition, mixed base crude oils such as Allian crude oil, eosin crude oil, and Solus crude oil can be preferably used.
In particular, a distillate furfural raffinate obtained by subjecting an atmospheric distillation residue to vacuum distillation, and a refined furfural raffinate obtained by subjecting it to further hydrorefining and / or MEK dewaxing treatment, propane as a vacuum distillation residue. A PDA extract obtained by deflaking, a PDA furfural extract obtained by furfural extraction of the PDA extract, and a PDA furfural raffinate obtained at the same time are subjected to MEK dewaxing and / or hydrorefining treatment to obtain a high purification amount. A petroleum heavy oil obtained by mixing one or more of these refined petroleum heavy oils such as a viscosity fraction (bright stock) is preferably used. Of these, naphthenic heavy oils obtained by treating naphthenic crude oils are preferred.

  The thermoplastic elastomer used in the regeneration additive composition of the present invention is composed of a block copolymer comprising a styrene block as a thermoplastic block and a block of another monomer as an elastomer block. Any one is used as long as the rate (MFR) is satisfied. These include, for example, a diblock copolymer having one thermoplastic block or a triblock copolymer having two thermoplastic blocks. Preferably, a thermoplastic elastomer such as a styrene-butadiene-styrene block copolymer (SBS), a styrene-isoprene-styrene block copolymer (SIS), or a styrene-ethylene-butylene-styrene block copolymer (SEBS). Can be suitably used, and these thermoplastic elastomers can be appropriately blended singly or in combination of two or more. Among them, a styrene-butadiene block copolymer, more specifically, a styrene-butadiene-styrene triblock copolymer (SBS), a styrene-butadiene diblock copolymer (SB) or a mixture thereof is more preferably used. The

As a thermoplastic elastomer, it is necessary for styrene content to satisfy 5-50 mass%. If the styrene content of the thermoplastic elastomer is less than 5% by mass, the compatibility with the deteriorated asphalt in the recycled aggregate decreases, and the regeneration effect on the modified asphalt for drainage pavement cannot be expected. % By mass or more is preferable, and 15% by mass or more is more preferable. On the other hand, the upper limit increases the compatibility of the regenerated additive with deteriorated asphalt, and the properties as a high-viscosity modified asphalt for drainage pavement, particularly the viscosity at 60 ° C. cannot be obtained. Preferably it is 45 mass% or less, More preferably, it is 40 mass% or less.
The melt flow rate (based on MFR: ASTM D1238, measured at 200 ° C., 5 kg) of the thermoplastic elastomer is preferably 40 or less. If it exceeds 40, the regeneration effect of the deteriorated asphalt binder on the high-viscosity modified asphalt for drainage pavement cannot be expected. Therefore, the melt flow rate is more preferably 35 or less, and more preferably 30 or less.
The higher the molecular weight of the thermoplastic elastomer, the better. Therefore, the lower limit value of the melt flow rate is not particularly limited, but is selected within a range compatible with each component of the regeneration additive.

The weight average molecular weight (Mw) of the synthetic wax used in the regeneration additive composition of the present invention needs to be 800 to 5,000. The lower limit of the weight average molecular weight is preferably 1000 or more, more preferably 1200 or more, from the viewpoint of preventing blocking of the regenerated additive composition molded into a pellet. On the other hand, the upper limit is required to be 5000 or less because solubility in petroleum heavy oil and thermoplastic elastomer is lowered, preferably 4000 or less, and more preferably 3500 or less. The weight average molecular weight here refers to the value of the weight average molecular weight (Mw) determined by gel permeation chromatography (GPC).
The type of synthetic wax used in the regeneration additive composition of the present invention is not particularly limited as long as it satisfies the above-mentioned properties, but a polyolefin wax obtained by a production method such as normal polymerization / synthesis type, modified type, decomposition type, Examples include Fischer-Tropsch synthetic wax (FT synthetic wax) obtained by Fischer-Tropsch synthesis.
The polyolefin wax is obtained by, for example, a polymerization method in which one or more olefin monomers are mainly used as a raw material and polymerized with a radical catalyst, a Ziegler-Natta catalyst, a metallocene catalyst, or the like, a decomposition method in which these polymers are decomposed, and the like. be able to. Typical examples include polyethylene wax, polypropylene wax, and ethylene-propylene copolymer wax. Modified polyolefin waxes obtained by processing or modifying these polyolefin waxes by chemical or physical means in order to improve the compatibility of the polymer can be preferably used.
The FT synthetic wax can be produced, for example, by synthesizing (FT synthesis) using a FT catalyst from a synthetic gas produced by gasification cracking of natural gas or petroleum heavy residual oil.

  Further, the above-mentioned regeneration additive composition of the present invention includes rubbers such as styrene-butadiene rubber, chloroprene rubber and natural rubber, ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA). You may mix petroleum resins, such as ethylene-type copolymers, such as aliphatic hydrocarbon resin, alicyclic hydrocarbon resin, and aromatic hydrocarbon resin. The mixing ratio in this case is preferably 100 parts by weight or less of these ethylene copolymers and petroleum resins with respect to 100 parts by weight of the thermoplastic elastomer. Furthermore, conventionally known amine-based, phosphate ester-based or amphoteric aggregate peeling inhibitors may be added as necessary.

The method for producing the regeneration additive composition of the present invention is not particularly limited as long as the blending ratio, properties, and the like satisfy the above ranges. Usually, the raw materials are heated, melted and mixed using a mixer such as a heat melting kettle, high shear mixer, Banbury mixer, Hensyl mixer, etc., and then used in a pelletizer, extrusion molding machine, processing molding machine, press molding machine, etc. It can be molded.
The shape of the regeneration additive composition of the present invention is not particularly limited, and can be used in any shape. For example, a pellet shape, a plate shape, a rod shape, a block shape, and the like can be mentioned. In consideration of the mixing property in the plant, a pellet shape is preferable. This shape may be in the form of a rod, and therefore the pellets herein include a small rod-like shape.
Pelletization of the regenerative additive composition is performed by, for example, mixing a predetermined amount of heavy petroleum oil, thermoplastic elastomer, and synthetic wax with a kneader at 150 to 180 ° C. for 3 to 10 minutes and then extruding them into a rod shape using a pelletizer. This can be achieved by cutting. At this time, the composition can be extruded into water from an extruder and cut into a predetermined size while cooling. Cooling water may be water at room temperature, but molding is better when controlled to 30 ° C. or lower.
Moreover, if necessary, in order to prevent blocking of the pellet, a silicon-based emulsion may be added to the cooling water to perform surface treatment of the pellet. Further, a commonly used adhesion preventing agent such as stone powder or calcium carbonate may be applied to the surface of the pellets separately molded. Since the regeneration additive of the present invention has no tackiness or is below a certain level, the use of an anti-adhesive agent is unnecessary or even if these anti-adhesive agents are used in combination, the amount used can be reduced. it can.
The diameter of the pellet is 1 to 50 mm, preferably 1 to 20 mm, and more preferably 1 to 10 mm. With such a size, it is possible to rapidly melt and disperse with the asphalt mixture containing the recycled aggregate. In the case of a rod-like shape, the diameter indicates the length of the rod or its diameter.

The regeneration additive of the present invention is usually 1 to 30 parts by weight, preferably 5 to 20 parts per 100 parts by weight of the degraded asphalt binder adhering to the recycled aggregate, although it depends on the degree of degradation of the degraded asphalt binder. Regeneration and recovery are possible by adding parts by weight. In the following, the deteriorated asphalt binder regenerated by mixing the regenerative additive may be referred to as a regenerated asphalt binder.
This recycled asphalt binder can be used alone, but depending on the degree of deterioration of the deteriorated asphalt binder, asphalt that is generally used for pavement (straight asphalt, Modified asphalt and semi-blown asphalt) can also be used. The mixing ratio of the new high-viscosity modified asphalt or the above asphalts is preferably 900 parts by weight or less with respect to 100 parts by weight of the recycled asphalt binder.

The method of using the regenerated additive of the present invention is the regenerated bone to which the deteriorated asphalt binder from the pavement generating material adheres when producing the reclaimed drainage pavement asphalt mixture using the regenerated aggregate in the asphalt mixture plant. It is used by simultaneously adding to the material and mixing.
That is, after adding a predetermined blend, a predetermined amount of recycled aggregate and a new aggregate as necessary to a mixer of a mixture plant, heating and charging at 150 to 200 ° C., and premixing for about 20 to 30 seconds, the present invention A regenerated drainage asphalt mixture for reclaimed drainage pavement is obtained by adding a predetermined amount of the above regenerated additive and, if necessary, a predetermined amount of the asphalt and mixing at 160 to 190 ° C., usually for about 40 seconds to 2 minutes.
The regeneration additive of the present invention regenerates and recovers a deteriorated pavement generating material into a drainage pavement asphalt mixture, but the pavement generating material to be regenerated can be appropriately selected as a general pavement generating material. . However, it is preferable to regenerate and recover the pavement generating material from the deteriorated drainage pavement to form an asphalt mixture for reclaimed drainage pavement, and pave this again into the drainage pavement.

Hereinafter, the present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to these examples.
The heavy mineral oil, thermoplastic elastomer (hereinafter abbreviated as TPE) and synthetic wax used are as follows.
(Heavy oil)
The heavy oil was used by adjusting three kinds of the following properties by appropriately mixing refined furfural raffinate, refined furfural extract, PDA furfural extract and bright stock with different fractions. These heavy oils are obtained from naphthenic base oils and their PCA is less than 3% by weight.
Heavy oil-A: Flash point 242 ° C.,% CA 15%
Heavy oil-B: Flash point 244 ° C.,% CA 6%
Heavy oil-C: Flash point 230 ° C.,% CA 16%

(TPE)
TPE used the following four types of SBS having different properties.
TPE-A: styrene content 25% by weight, MFR7
TPE-B: Styrene content 3% by weight, MFR1 or less TPE-C: Styrene content 50% by weight, MFR25
TPE-D: Styrene content 20% by weight, MFR70

(Synthetic wax)
As the synthetic wax, the following three modified polyethylene wax modified types having different molecular weights were used.
Synthetic wax-A: weight average molecular weight (Mw) 2100
Synthetic wax-B: weight average molecular weight (Mw) 700
Synthetic wax-C: weight average molecular weight (Mw) 6000

(Manufacturing of regenerative additive)
Regenerative additives are added to the kneader at each compounding ratio in each mixing ratio, heated, melted, mixed and stirred at 160 ° C. for 2 hours, extruded into cold water with a pelletizer, cut in water, and 3 mm in diameter and 4 mm in length. Manufactured by cutting into pellets.
In addition to being used for various tests, this was also used for the blocking resistance test of the regenerative additive described below.

Various test methods used in the method for adjusting the simulated deteriorated asphalt for testing, Examples and Comparative Examples are as follows.
How to adjust the simulated degraded asphalt binder:
In order to simulate the actual deteriorated asphalt binder that adheres to the recycled aggregate, accelerated deterioration by conducting a thin film heating test on a high-viscosity modified asphalt for commercial drainage pavement and further performing a pressure accelerated deterioration test A simulated deteriorated asphalt binder for testing was obtained.
How to adjust recycled asphalt binder:
A regenerated high viscosity modified asphalt was prepared by adding 10% by weight of a separately produced regenerated additive to the simulated deteriorated asphalt binder obtained above and stirring at 180 ° C. for 5 minutes.
In addition, the actual use of the regenerated additive is, as described above, used by adding the regenerated additive to the regenerated aggregate to which the deteriorated asphalt is adhered. Since the degree of deterioration is not constant, for the performance comparison test, a simulated deteriorated asphalt for test was obtained as described above, and this was used for the test.
Then, a regeneration additive is added to the simulated degraded asphalt for testing, and this is recovered and regenerated into a high-viscosity modified asphalt. The physical properties of the high-viscosity modified asphalt are measured. The degree of recovery and regeneration was tested in comparison with the standard value of high-viscosity modified asphalt established by the Quality Asphalt Association.
Further, as mixability of the asphalt composite material, as described later, a regenerative additive was added to and mixed with the regenerated aggregate and evaluated by the stability of the Marshall stability test.

(1) Thin film heating test:
In accordance with “Thin film heating test method” described in JIS K2207.
(2) Pressurized accelerated deterioration test:
According to “Pavement Test Method Handbook” (edited by the Japan Road Association), “Accelerated Degradation Test Method for Paving Binders Using Pressure Degraded Containers”.
(3) Degree of penetration:
According to JIS K2207.
(4) Softening point:
According to JIS K2207.
(5) Elongation:
According to JIS K2207.
(6) 60 ° C. viscosity:
According to “60 ° C. Viscosity Test Method” described in “Pavement Test Method Handbook” (edited by the Japan Road Association).
(7) Toughness, Tenacity:
It conforms to the “Toughness Tenacity Test Method” described in “Handbook of Pavement Test Method” (edited by the Japan Road Association).
(8) Blocking resistance:
500 g of the regeneration additive was collected in a 1 liter beaker and left at 40 ° C. for 24 hours. After cooling to room temperature, the regeneration additive was removed from the beaker and observed by hand to see if it was blocking.
The state where it was easily separated by hand was evaluated as “◯”, and the state where the pellets were fixed to each other was evaluated as “x”. When the pellet was not moldable, “XX” was used.
(9) Homogeneity of recycled asphalt binder:
10% by weight of the regenerative additive was added to the simulated deteriorated asphalt binder for testing, stirred at 180 ° C. for 5 minutes, cooled and solidified, and the surface was visually observed.
The smooth and uniform surface was evaluated as “◯”, and the non-uniform state as “×”.
(10) Mixability of asphalt mixture:
100 parts by weight of recycled aggregate, 100 parts by weight of new aggregate, 5 parts by weight of commercially available high-viscosity modified asphalt and 10% by weight of recycled additive with respect to the deteriorated asphalt binder in the recycled aggregate, The mixture was stirred and mixed at 180 ° C. for 2 minutes to prepare a specimen for Marshall test.
The mixability of the asphalt mixture was evaluated by the stability of the Marshall stability test.
(11) Marshall stability test:
According to “Marshall stability test method” described in “Handbook of Pavement Test Method” (edited by Japan Road Association).

[Examples 1-4 and Comparative Examples 1-2, Experimental Examples 1-2]
The regeneration additives of Examples 1 to 4, Comparative Examples 1 and 2, and Experimental Examples 1 and 2 were adjusted at the blending ratios shown in Table 1, and the blocking resistance and the properties of the recycled asphalt binder were evaluated.
The regeneration additives of Examples 1 to 4 have good blocking resistance, and the properties of the regenerated asphalt binder all satisfy the standard value of the high-viscosity modified asphalt of the Japan Modified Asphalt Association standard.
In Comparative Example 1, 20 parts by weight of TPE-A is blended with 100 parts by weight of heavy oil-A, and no synthetic wax is blended. Therefore, this blend is highly tacky and cannot be molded by a pelletizer. Even blocking resistance could not be measured. In Comparative Example 2, although the amount of TPE-A was increased as compared with Comparative Example 1, synthetic wax was not blended, so pelletization was possible but blocking resistance was poor.
In Experimental Example 1, since the blending amount of TPE-A was small, the blocking resistance was poor, and the property of the regenerated asphalt binder could not satisfy the standard value of the high viscosity modified asphalt of the Japan Modified Asphalt Association. In Experimental Example 2, since the amount of TPE-A blended is large, the antiblocking property is good, but the homogeneity is poor, and furthermore, the standard value of the high viscosity modified asphalt of the Japan Modified Asphalt Association cannot be satisfied. It was.

The regeneration additives of Experimental Examples 3 to 5 were prepared at the blending ratio shown in Table 2, and 10% by weight was added to the deteriorated asphalt binder to evaluate the properties of the regeneration asphalt binder.
When the regenerated asphalt binder was prepared, the regenerated additive of Experimental Example 3 had good homogeneity, and all of the flash point, the thin film heating test mass change rate, and the viscosity at 60 ° C. satisfied the standard value of the high viscosity modified asphalt. Yes. In Experimental Example 4, the homogeneity of the recycled asphalt binder is poor because the% CA of the heavy oil of the compounding material is low. Moreover, since the flash point of a compounding material is low in Experimental Example 5, the flash point, the thin film heating test mass change rate, and the viscosity at 60 ° C. of the recycled asphalt binder do not satisfy the standard values.

  The regeneration additives of Experimental Examples 6 to 9 were adjusted at the blending ratios shown in Table 3, and 10% by weight was added to the deteriorated asphalt binder to evaluate the properties of the regeneration asphalt binder. The regenerated additive of Experimental Example 6 has good homogeneity when the regenerated asphalt binder is prepared, and satisfies the standard value of 60 ° C. viscosity of the high viscosity modified asphalt. On the other hand, in Experimental Example 7, the homogeneity of the recycled asphalt binder was poor because the styrene content of TPE was low, and the viscosity at 60 ° C. was not measurable. In Experimental Example 8, since the styrene content of TPE is high, the viscosity at 60 ° C. is low and the standard value is not satisfied. In Experimental Example 9, since the MFR of TPE is large, the viscosity at 60 ° C. is low and the standard value is not satisfied.

  The regeneration additive of Experimental Examples 10 to 12 was adjusted at the blending ratio shown in Table 4, and the blocking resistance of the regeneration additive was evaluated. Further, the homogeneity of the recycled asphalt binder was evaluated by adding 10% by weight to the deteriorated asphalt binder. The regeneration additive of Experimental Example 10 has good blocking resistance and good homogeneity of the regenerated asphalt binder. On the other hand, since the molecular weight of the synthetic wax was small in Experimental Example 11, the blocking resistance was poor. In Experimental Example 12, since the synthetic wax had a large molecular weight, the homogeneity of the regenerated asphalt binder was poor although the blocking resistance was good.

  Reproduction additives of Experimental Examples 13 to 16 having different shapes at the blending ratios shown in Table 5 were tried. Using this additive, a regenerated high viscosity modified asphalt mixture was prepared using a Pugmill mixer, and a specimen for a Marshall stability test was prepared. The mixability of the asphalt mixture was evaluated by the stability of the Marshall test. In Experimental Example 13 and Experimental Example 14, the shape of the regenerative additive was pellets having a diameter of 0.3 mm × a length of 0.4 mm and a diameter of 3 mm × a length of 4 mm, respectively. Good results were obtained for the Marshall stability of the specimens using this regeneration additive, and it was confirmed that the asphalt mixture was sufficiently mixed. On the other hand, in Experimental Example 15 and Experimental Example 16, since the shape of the regeneration additive was large, the asphalt mixture was not sufficiently mixed and the Marshall stability was poor.

The above regenerative additive is composed of 10 to 150 parts by weight of SBS having a styrene content of 5 to 50% by weight as a thermoplastic elastomer and an MFR (200 ° C., 5 kg) of 40 or less and a synthetic wax with respect to 100 parts by weight of heavy oil. 10 to 40 parts by weight of polyethylene wax having a molecular weight of 800 to 5000 can be blended, heated and mixed, and molded into a pellet having a particle size of 50 mm or less.
The package can be subdivided into 500 g to 1 kg in a thin polyethylene bag to make a product. Such subdivision is convenient because the polyethylene bags can be put into the asphalt mixture plant. Further, when used in a large amount, the package may be a drum can, and in this case, automatic charging can be performed in an asphalt mixture plant by an air lift or the like.

Claims (5)

  A regeneration additive composition for regenerating a pavement generating material into a drainage pavement asphalt mixture, comprising petroleum heavy oil, a thermoplastic elastomer and a synthetic wax as constituent components.   The regeneration additive composition according to claim 1, comprising 10 to 150 parts by weight of a thermoplastic elastomer and 10 to 40 parts by weight of a synthetic wax with respect to 100 parts by weight of heavy petroleum oil.   The regeneration additive composition according to claim 1 or 2, wherein the synthetic wax has a weight average molecular weight (Mw) of 800 to 5,000.   A pellet having a molded diameter of 1 to 50 mm, comprising the regenerated additive composition according to any one of claims 1 to 3.   1 to 30 parts by weight of the regeneration additive composition according to any one of claims 1 to 3 is heated and mixed with respect to 100 parts by weight of the deteriorated asphalt binder adhering to the recycled aggregate as a pavement generating material. Regenerated drainage pavement asphalt mixture.