JP2002338813A - Pavement bonding material, preparation process of pavement bonding material, modifier for pavement bonding material and its preparation process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pavement bonding material variety of which material can be prepared in a preparation line in a short period of time and to provide a preparation process of the pavement bonding material, a modifier to prepare the pavement bonding material and a preparation process of the modifier. SOLUTION: A base bonding material is prepared by grinding and mixing a straight asphalt and a styrene/butadiene/styrene block copolymer (SBS) of an average molecular weight of 150,000 with a mill 12 and dissolving it uniformly in a preparation tank for a short period of time. Simultaneously, a modifier is prepared by dissolving an SBS of an average molecular weight of 250,000 in an aromatic oil at 160 deg.C to 180 deg.C. Then, a pavement bonding material is completed by mixing the modifier with the base bonding material. Various pavement bonding materials can be prepared by changing the amount of the modifier to mix.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pavement binder containing asphalt as a main component and to which a modifier made of a high-molecular polymer is added, a method for producing the same, and a modifier and a method for producing the same.

[0002]

2. Description of the Related Art In modern society, paved roads play the most important role in terms of transportation. Asphalt is inexpensive, can be obtained in large quantities, and is widely used as a binder for paving. Asphalt is mixed with an aggregate such as gravel or crushed stone, and is laid on a road to form a pavement.

[0003] Road pavements have been required to be durable enough to support vehicle traffic for many years. A major factor affecting the durability of the pavement is the environmental temperature in addition to the traffic volume and the vehicle weight of the vehicle. A pavement using asphalt as a binder for pavement softens and easily deforms due to the weight of the vehicle when the temperature rises in summer, resulting in a rut on the road surface. Also, when the temperature falls in winter, the pavement hardens and loses its flexibility, and breaks such as cracks easily occur. In order to solve this problem, a polymer such as rubber or thermoplastic resin is added to asphalt as a modifier to prevent softening in the high-temperature region, ensure flexibility in the low-temperature region, and further increase abrasion resistance. Conventionally, asphalt has been modified so as to improve the property.

[0004] Vehicle weight and vehicle traffic are continually increasing, and road pavements are being improved over time to be more durable. In recent years, the ratio of bridges or tunnels to roads that have been created has increased, and therefore, binders for bridge surface pavement with improved flexibility compared to those for general roads have been developed. For tunnels where repair work is difficult due to difficulties in traffic regulation or height restrictions, pavement binders with further improved durability have been developed. Further, as a material for use in cold regions, a pavement binder that has flexibility in a lower temperature region than that for general roads has been developed. Furthermore, road environmental problems include noise generated by vehicles passing through the road and poor drainage due to the road surface being covered with pavement.To address these problems, sound absorption or drainage is required. Pavement binders with pavement properties have been developed. As described above, various types of pavement binders have been developed according to applications, and manufacturers are required to have the ability to supply various pavement binders according to demand.

[0005] Conventionally, pavement binders have been manufactured by a batch-type manufacturing method. FIG. 2 is an explanatory view showing a conventional method for manufacturing a pavement binder by a batch method. Reference numeral 10 in the figure denotes a production tank. In the production tank 10, a modifier for improving the characteristics of asphalt is dissolved in straight asphalt refined from crude oil to produce a binder for pavement. The straight asphalt is put into the production tank 10 in a liquid state, and a modifier such as a polymer such as rubber is also put into the production tank 10. Production tank 10
Then, the straight asphalt and the modifier are agitated, and at a predetermined temperature that does not cause thermal deterioration, the modifier is uniformly dispersed in the straight asphalt and dissolved for a predetermined time until the pavement binder is completed. The binder is removed from the production tank 10 and shipped or stored. In order to produce a plurality of types of pavement binders, the amount of the straight asphalt or the amount of the modifier is adjusted, and if necessary, various additives such as an anti-peeling agent are further added to the production tank 10. By adding and manufacturing, the properties of the pavement binder are adjusted.

[0006] In the above-mentioned batch-type production method, the material is put into the production tank and the pavement binder is completed in the production tank, so that only one kind of pavement binder can be produced in one production line. Manufacturers of binders for surfacing are equipped with a plurality of production lines and a plurality of types of storage equipment corresponding to a plurality of types to meet the demand for a wide variety of pavement binders.

[0007] In the conventional batch-type manufacturing method,
Since it takes time to dissolve in the production tank, Nissan
The limit is about 40 tons, and when a large amount of pavement binder is required, such as when a road is constructed by a public project, the conventional batch-type production volume cannot meet the demand. was there. To solve this problem, straight asphalt and a polymer modifier are ground and mixed with a mill, and the modifier is forcibly dissolved in the asphalt to shorten the dissolution time and reduce the production volume of Nissan. Increasing continuous mixing manufacturing methods have been used.

[0008]

By using the continuous mixing method, it has become possible to produce a large amount of pavement binder in a short time. However, since only one product type can be manufactured on one production line, to supply multiple product types,
Multiple production lines and various types of storage equipment are required.
As mentioned above, the types of pavement binders are expected to be further subdivided in the future, and it is not practical to increase the types of production lines and storage facilities any more. There is a demand for a production method capable of producing various types of pavement binders.

By the way, as a modifying agent for producing a pavement binder by adding to asphalt, a modifying effect such as expansion of usable temperature range or improvement of durability in usable temperature range is high. Therefore, a styrene / butadiene / styrene block copolymer (hereinafter, referred to as SBS) has been widely used. In order to enhance the effect of modifying asphalt, the larger the average molecular weight of SBS, the better. However, when the average molecular weight of SBS is 200,000 or more, to dissolve SBS in asphalt,
The temperature at the time of melting must be 200 ° C. or higher,
Above ° C, asphalt and SBS undergo thermal degradation, so that SBS having an average molecular weight of 200,000 or more has not been used as a modifier.

The present invention has been made in view of such circumstances, and an object of the present invention is to manufacture a basic binder having basic properties as a pavement binder by using a continuous mixing method. Then, a modifier is prepared by dissolving SBS having an average molecular weight of 200,000 or more in a solvent, and an amount of the modifier corresponding to the desired property is mixed with the basic binder, whereby a variety of products can be produced in one production line. A pavement binder, a method for producing the pavement binder, a modifier for producing the pavement binder, and a method for producing the modifier. To provide.

[0011]

According to a first aspect of the present invention, there is provided a pavement binder comprising asphalt and SBS, wherein the pavement binder comprises SBS having an average molecular weight of 200,000 or more. And

According to a second aspect of the present invention, there is provided a method for producing a pavement binder by dissolving a polymer in asphalt, wherein the asphalt and the polymer are ground and mixed, and dissolved for a predetermined time to form a base. A binder is prepared, and SBS having an average molecular weight of 200,000 or more is added to a solvent.
The method is characterized in that a modifier is prepared by dissolving at 0 ° C. or lower, and the modifier is mixed with the base binder to produce a pavement binder.

According to a third aspect of the present invention, there is provided a method for manufacturing a pavement binder by dissolving SBS in asphalt to produce a pavement binder.
Of SBS having a mean molecular weight of 200,000 or more.
Add BS to aromatic or naphthenic process oil
The method is characterized in that a modifier is prepared by dissolving at 10 to 18% by mass at 0 to 180 ° C., and the modifier is mixed with the basic binder to produce a binder for paving.

The modifier for a pavement binder according to the fourth invention is:
It is characterized in that SBS having an average molecular weight of 200,000 or more is dissolved in an aromatic or naphthenic process oil by 10 to 18% by mass.

According to a fifth aspect of the present invention, there is provided a method for producing a modifier for a pavement binder, comprising: converting SBS having an average molecular weight of 200,000 or more into an aromatic or naphthenic process oil at 160 to 180 ° C.
0 to 18% by mass is dissolved.

As described above, S having an average molecular weight of 200,000 or more
BS did not readily dissolve in asphalt and was difficult to use as a modifier. However, the present inventor has found that SBS having an average molecular weight of 200,000 or more is dissolved in aromatic or naphthenic oil at 160 to 180 ° C. Therefore, the oil in which the SBS is dissolved can be used as a modifier for modifying asphalt.

In the first invention, a pavement binder mainly composed of asphalt has an average molecular weight of 200,000 or more.
By including the BS, it is possible to obtain a high quality pavement binder, and it is possible to obtain a pavement binder of the same quality as the conventional one using a smaller amount of SBS than before.

In the second invention, a base binder having basic properties as a pavement binder is manufactured by using a continuous mixing type manufacturing method, and SBS having an average molecular weight of 200,000 or more is produced.
Is dissolved in a solvent to produce a modifier, and an amount of the modifier corresponding to the desired properties of the pavement binder is mixed with the base binder to produce a pavement binder. The pavement binder is completed only by mixing the base binder and the modifier, and it is not necessary to spend time for dissolving the modifier, so that the desired pavement binder can be manufactured in a short time. In addition, the base binder and the modifier are always manufactured, and the amount of the modifier mixed with the base binder is changed to change the characteristics of the pavement binder as a product. Thus, various kinds of pavement binders can be manufactured.

In the third invention, a base binder having basic properties as a pavement binder is manufactured by using a manufacturing method of a continuous mixing system, and SBS having an average molecular weight of 200,000 or more is produced.
Is dissolved in an aromatic or naphthenic oil to produce a modifier, and an amount of the modifier corresponding to the desired properties of the pavement binder is mixed with the base binder to produce a pavement binder. . The pavement binder is completed just by mixing the base binder and the modifier, and there is no need to spend time dissolving the modifier.
A desired pavement binder can be manufactured in a short time.
In addition, the base binder and the modifier are always manufactured, and the amount of the modifier mixed with the base binder is changed to change the characteristics of the pavement binder as a product. Thus, various kinds of pavement binders can be manufactured.

In the fourth invention, as an asphalt modifier used for a binder for paving, SB having an average molecular weight of 200,000 or more dissolved in an aromatic or naphthenic oil is used.
Since S is used, it is possible to obtain a high-quality pavement binder, and it is possible to obtain a pavement binder of the same quality as the conventional one by adding a smaller amount than the conventional one.

In the fifth invention, SBS having an average molecular weight of 200,000 or more is dissolved in an aromatic or naphthenic oil at 160 to 180 ° C., so that when mixed with asphalt, asphalt and SBS undergo thermal degradation. Without
In addition, since it is quickly mixed with asphalt, a desired pavement binder can be easily obtained.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on its embodiments. The pavement binder of the present invention is a base binder produced by grinding and mixing straight asphalt and SBS having an average molecular weight of 200,000 or less, and SBS having an average molecular weight of 200,000 or more into aromatic or naphthenic oil. It is obtained by mixing the modifier of the present invention produced by dissolution.

[0023]

[Table 1]

First, SBS having an average molecular weight of 200,000 or more will be described in comparison with SBS having an average molecular weight of 200,000 or less. Table 1 shows the physical properties of asphalt when 5% by mass of SBS having an average molecular weight of 150,000 or SBS having an average molecular weight of 250,000 was added to straight asphalt. Asphalt to which SBS having an average molecular weight of 250,000 has been added has a higher softening point temperature and higher viscosity at 60 ° C than asphalt to which SBS having an average molecular weight of 150,000 has been added. This shows that the effect of increasing the temperature at which the asphalt softens to increase the usable temperature range as a binder for paving and increasing the viscosity to prevent rutting is higher for SBS having an average molecular weight of 250,000. .

[0025]

[Table 2]

[0026]

[Table 3]

[0027]

[Table 4]

5% by mass of SBS having an average molecular weight of 150,000 or SBS having an average molecular weight of 250,000
Table 2 shows the dissolution time when dissolving, and Table 3 shows the dissolution time when each SBS was dissolved at 15% by mass in aromatic oil.
Shown in As shown in Table 2, SBS having an average molecular weight of 250,000
To dissolve directly in straight asphalt,
Although a long time is required even at a high temperature of 180 ° C. or higher, it is relatively easily dissolved in an aromatic oil even at a temperature of 180 ° C. or lower, as shown in Table 3. Table 4 shows the kinematic viscosity at 180 ° C. when 15% by mass of SBS having an average molecular weight of 150,000 or SBS having an average molecular weight of 250,000 was dissolved in an aromatic oil. It can be seen that the oil in which SBS having an average molecular weight of 250,000 is dissolved has a lower viscosity and is easier to mix with asphalt.

As described above, SBS having an average molecular weight of 250,000 has a high effect of modifying asphalt, and it is possible to modify asphalt by dissolving it in an aromatic oil at 160 ° C. to 180 ° C. and mixing with the asphalt. It became clear that it was. When the amount of SBS having an average molecular weight of 250,000 dissolved in oil is small, the effect of modifying asphalt is low, and when the amount is large, the viscosity of the modifier is increased and work becomes difficult. % Is good.

Next, a method for producing a pavement binder of the present invention,
And a method for producing a modifier will be described with reference to the drawings showing the embodiments. FIG. 1 is a block diagram showing a production line for a pavement binder and a modifier according to the present invention, wherein arrows in the figure indicate the flow of materials or products. First, a basic binder having basic properties as a pavement binder is manufactured by a conventional continuous mixing method. The straight asphalt passes through the flow meter F1 in a liquid state, is charged into the pre-mixing tank 11, and is supplied with SB having an average molecular weight of 150,000.
S is measured in a solid state by a weighing device M1 and is put into the premixing tank 11. The ratio of SBS having an average molecular weight of 150,000 is 7% by mass. Straight asphalt and SBS having an average molecular weight of 150,000 are appropriately mixed in a pre-mixing tank 11 and charged into the next mill 12.

The mill 12 grinds the charged straight asphalt and SBS having an average molecular weight of 150,000, forcibly dissolves solid SBS into the straight asphalt, and forms a liquid melt as a whole to form the next production tank 1
Input to 0. The mill 12 has a processing capacity of 10 tons in one hour and pours 60 tons of melt into the production tank 10 in six hours.

[0032] The production tank 10 stirs the supplied melt and uniformly dissolves SBS in straight asphalt. Since the SBS is forcibly dissolved by the mill 12, the SBS is uniformly dissolved in 3 hours, and the basic binder is completed. The production tank 10 has a capacity of 60 tons and it takes 6 hours to produce 60 tons of melt on the mill 12, so that a total of 9 hours produces 60 tons of base binder. The above is the production line of the basic binder using the production method of the continuous mixing system, and all the steps are performed at a temperature of 180 ° C. to 200 ° C. at which the asphalt does not solidify and thermally deteriorate. The completed base binder can be directly removed from the production tank 10 and used as a pavement binder.

The modifier is produced in parallel with the production line for the base binder. The aromatic oil passes through the flow meter F2 in a liquid state and is charged into the modifier tank 20, and the SBS having an average molecular weight of 250,000 is weighed by the measuring instrument M2 and is then transferred to the modifier tank 20. It is thrown. The ratio of SBS having an average molecular weight of 250,000 is 15% by mass. The injected SBS having an average molecular weight of 250,000 is dissolved in the aromatic oil at a temperature of 160 ° C. to 180 ° C. to complete the modifier. Average molecular weight 2
As shown in Table 3, 50,000 SBS dissolves in the aromatic oil in 6 to 9 hours, so that the modifier can be completed in the time until the base binder is completed.

Next, the base binder prepared in parallel and the modifier are mixed to produce the pavement binder of the present invention. The base binder passes through the flow meter F3 and is charged into the mixer 30,
The modifying agent passes through the flow meter F4 and is mixed by an appropriate amount in the mixer 30.
It is thrown into. The mixer 30 mixes the supplied basic binder and the modifier. The base binder and modifier are both 1
Since it is a liquid of about 80 ° C., it is easily mixed and the pavement binder of the present invention is completed. Other additives, such as anti-peeling agents for preventing the pavement binder from being separated from the aggregate of the pavement, are added to the mixer 30 by a necessary amount, if necessary,
In addition, by changing the amount of the modifier to be charged into the mixer 30, a plurality of types of pavement binders can be manufactured. The produced pavement binder is stored in a storage tank or shipped by type.

As described in detail above, by using the method for manufacturing a pavement binder of the present invention, a large amount of pavement binder can be manufactured in a short time, and a plurality of types of pavement binders can be manufactured in one manufacturing line. It has become possible to produce pavement binders.

[0036]

[Table 5]

[0037]

[Table 6]

Next, examples of the binder for paving of the present invention will be described. Table 5 shows the components and physical properties of the base binder, the first binder obtained by adding a modifier to the base binder, and the second binder obtained by further adding a modifier. Compared with the base binder, the first binder and the second binder have higher penetration and lower softening point,
It is softer, but has increased viscosity and elongation and increased flexibility. Table 6 shows the components and physical properties of the third binder and the fourth binder, which are conventional pavement binders. The first binder according to the present invention corresponds to a conventional third binder, and the second binder according to the present invention corresponds to a conventional fourth binder. It can be seen that the pavement binder of the present invention has the same physical properties as the conventional one despite the low SBS content. The second binder is about 1.4 relative to the first binder.
This is a pavement binder with twice the amount of modifier added to the base binder.By changing the amount of modifier added, the physical properties of the pavement binder are changed, and demand for multiple types of pavement binders increases. It can be seen that it can be supplied in accordance with.

In this embodiment, the average molecular weight is 25
Although an aromatic oil was used as a solvent for dissolving 10,000 SBS, a similar effect can be obtained when a naphthenic oil is used instead of the aromatic oil. In the present embodiment, the average molecular weight is 2
50,000 SBS was used, but SB with higher average molecular weight
S, for example, SBS having an average molecular weight of 300,000 may be used.

[0040]

According to the first aspect of the present invention, a pavement binder containing asphalt as a main component has an average molecular weight of 200,000 or more.
The inclusion of BS makes it possible to obtain a high-quality pavement binder, and it is possible to obtain a pavement binder of the same quality as the conventional one using a smaller amount of SBS than before.

In the second invention, a base binder having basic properties as a pavement binder is manufactured by using a manufacturing method of a continuous mixing system, and SBS having an average molecular weight of 200,000 or more is produced.
Is dissolved in a solvent to produce a modifier, and the modifier is mixed with the base binder to produce a pavement binder, whereby the pavement binder can be completed in a short time, and By changing the amount of the modifier to be mixed with the base binder, various kinds of pavement binders can be manufactured in one production line.

In the third invention, a base binder having basic properties as a pavement binder is manufactured using a continuous mixing type manufacturing method, and SBS having an average molecular weight of 200,000 or more is produced.
Is dissolved in an aromatic or naphthenic oil to produce a modifier, and the modifier is mixed with the base binder to produce a binder for paving, thereby completing the binder for paving in a short time. By changing the amount of the modifying agent mixed with the base binder, a variety of pavement binders can be produced in one production line.

According to a fourth aspect of the present invention, as an asphalt modifier used for a pavement binder, SB having an average molecular weight of 200,000 or more dissolved in an aromatic or naphthenic oil is used.
Since S is used, it is possible to obtain a high-quality pavement binder, and it is possible to obtain a pavement binder of the same quality as the conventional one by adding a smaller amount than the conventional one.

In the fifth invention, SBS having an average molecular weight of 200,000 or more is dissolved in an aromatic or naphthenic oil at 160 to 180 ° C., so that asphalt and SBS do not undergo thermal deterioration when mixed with asphalt. In addition, the present invention has an excellent effect such that a binder for paving can be easily obtained because it is rapidly mixed with asphalt.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a production line for a pavement binder and a modifier according to the present invention.

FIG. 2 is an explanatory view showing a conventional method for manufacturing a pavement binder by a batch method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Manufacturing tank 11 Pre-mixing tank 12 Mill 20 Modifier tank 30 Mixer F1, F2, F3, F4 Flow meter M1, M2 Measuring device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ken Omichi 1-5 Doyamacho, Kita-ku, Osaka-shi, Osaka Nichisei Co., Ltd. (72) Inventor Mutsuji Kojima 1-15 Kagurazaka, Shinjuku-ku, Tokyo Nikko Evolution (72) Inventor Hiroshi Yamanoguchi 1-15 Kagurazaka, Shinjuku-ku, Tokyo Nikko Evolution Co., Ltd. F-term (reference) AE052 AG001 BP013 GL00

Claims (5)

[Claims] 1. A pavement binder comprising asphalt and a styrene / butadiene / styrene block copolymer, comprising a styrene / butadiene / styrene block copolymer having an average molecular weight of 200,000 or more. Characteristic pavement binder. 2. A method for producing a binder for paving by dissolving a polymer in asphalt, wherein the asphalt and the polymer are ground and mixed, and dissolved for a predetermined time to prepare a basic binder, and a base binder having an average molecular weight of 200,000 or more. Styrene / butadiene / styrene block copolymer is dissolved in a solvent at 200 ° C or lower to prepare a modifier,
A method for producing a pavement binder, comprising mixing the modifier with the base binder to produce a pavement binder. 3. A styrene / butadiene / asphalt
A method for producing a pavement binder by dissolving a styrene block copolymer, wherein asphalt and a styrene / butadiene / styrene block copolymer having an average molecular weight of 200,000 or less are ground and mixed, and dissolved for a predetermined time to form a basic bond. A material is prepared, and a styrene-butadiene-styrene block copolymer having an average molecular weight of 200,000 or more is dissolved in an aromatic or naphthenic process oil at 160 to 180 ° C at 10 to 18% by mass to prepare a modifier. A method for producing a pavement binder, which comprises mixing the modifier with the base binder to produce a pavement binder. 4. A pavement binder characterized in that 10 to 18% by mass of a styrene / butadiene / styrene block copolymer having an average molecular weight of 200,000 or more is dissolved in an aromatic or naphthenic process oil. Modifier. 5. A styrene / butadiene / styrene block copolymer having an average molecular weight of 200,000 or more is added to an aromatic or naphthenic process oil at 160 to 180 ° C. for 10 to 1 hour.
A method for producing a modifier for a pavement binder, wherein the modifier is dissolved by 8% by mass.