KR101505829B1 - Modifier Composition for Warm Mixing Asphalt, and Warm Mixing Asphalt Mixture manufactured using the same - Google Patents

Abstract

The present invention relates to a warm asphalt modifier composition and a warm asphalt mixture satisfying at least 76-22 performance grade (PG) manufactured by using the same, the warm asphalt modifier comprising 1-70 wt% of an amide wax; the remaining amount of a dispersing agent; and additionally 50 or less wt% of a polyethylene wax.

Description

Modifier Composition for Warm Mixing Asphalt, and Warm Mixing Asphalt Mixture Produced Using the Same "

More particularly, the present invention relates to an asphalt modifier composition comprising a modified wax and a dispersant, and a mesophilic asphalt mixture satisfying the public grade PG 76-22 or higher produced by using the modified asphalt modifier composition.

During the first commitment period (2008-2012) of the Kyoto Protocol, 36 countries, including Europe and Japan, are obliged to reduce the average of 5.2% of GHG emissions by 1990. This means that new and renewable energy sources and technologies, It is expected to grow rapidly. Recently, the issue of 'low-carbon green growth' which has emerged as a national issue has led to the construction industry, and eco-friendly public law research has been vigorously developed and technologies are being developed continuously.

In the construction industry, asphalt pavement technology is used to coat asphalt aggregate by using the thermoplasticity of asphalt, and it is used as an indispensable technique in the construction industry. Specifically, in the asphalt pavement technology, the technique of optimizing the amount of asphalt coating on the aggregate is very important, and the mixing temperature is very important for realizing this.

Currently, ascon, which is mainly manufactured in Korea and overseas, is a hot mixed asphalt mixture (hereinafter referred to as "HMA"). However, asphalt (AP-3, AP-5), which is one of the HMAs currently used in Korea, has four seasons as in Korea and has cracks in the winter when the temperature is strongly strengthened and insufficient heat resistance in summer There are disadvantages. As a result, AP-3 and AP-5 asphalt which are used in the domestic market are classified into PG 58-22 and PG 64-22, so the PG grade should be improved.

However, the HMA method is disadvantageous in that it consumes a large amount of spent fuel because it is at a high temperature during manufacturing, and also produces a relatively large amount of carbon dioxide, which is a major contributor to greenhouse gases, due to a large amount of harmful emissions generated during production or packaging. Specifically, conventional asphalt pavement is constructed by a mixture of asphalt and aggregate called ascon. In order to mix asphalt and aggregate, it must be heated to a high temperature of 160 to 200 ° C. This high temperature asphalt pavement has a problem that the opening time is delayed for the time required to cool down to room temperature and the workers are exposed to the risk of safety accident due to the harmful gas generated in the asphalt pavement. Especially, it requires a lot of energy to heat the aggregate and the asphalt, and it also involves a problem of increasing the emission of harmful gas such as carbon dioxide (CO ₂ ) during the production and construction of the ascon.

Therefore, in order to overcome the disadvantages of the HMA method, studies have been actively conducted on a method of using a medium temperature asphalt mixture (Warm Mixing Asphalt, hereinafter referred to as "WMA") at a lower temperature than the HMA method. This mesophase asphalt pavement refers to the packing of asphalt at a temperature of about 30 ° C lower than that of conventional asphalt pavement at 140-170 ° C.

In the development of such a mesophase asphalt mixture, it is practically impossible to improve the fluidity of the asphalt raw material in order to increase the PG grade of the asphalt, and studies have been actively made to improve the fluidity of the asphalt by adding the asphalt modifier. When the PG grade is improved by using the asphalt modifier, the mixing temperature of the asphalt and the aggregate is largely lowered, thereby reducing the plastic deformation, improving the resistance, improving the low temperature characteristics, reducing the curing time and reducing the amount of harmful steam dust.

Concretely, the key point of middle-temperature asphalt pavement technology is to add asphalt additive that lowers the viscosity at mid-temperature or to make foamed asphalt, and it is effective to lower the temperature of ascon production and pavement temperature by about 30 ℃ compared with normal heated asphalt . As a result, the emission of carbon dioxide gas and harmful gas released into the atmosphere is drastically reduced, the oxidation aging of the asphalt binder is slowed to prolong the life of the packaging, and the reduction of the temperature of the ascon production reduces the petroleum-based fuel by about 30% .

Therefore, in order to improve these effects, mid-temperature asphalt pavement technology has been focused on development and test application to lower the asphalt mixing temperature. Particularly, it is most typical to prepare an asphalt mixture by adding an asphalt modifier which can lower the mixing temperature of the asphalt and the aggregate and improve the resistance to plastic deformation while suppressing the deterioration of the low temperature characteristics of the asphalt. As the modifier, Is most widely used.

Korean Pat. Nos. 10-0800121 and 10-0823352 propose a WMA manufacturing technique capable of producing and compaction of an asphalt mixture at a temperature of about 25 to 40 ° C lower than that of a conventional HMA by using a small bit wax and a polyethylene resin.

Korean Patent No. 10-0912403 proposes a modifier composition for a mesophase asphalt mixture which expresses a public grade of PG 76-22 or higher by using an asphalt modifier comprising a polyamide-based polymer compound, a low-density polyethylene resin, and a process oil.

However, in the conventional asphalt, the stiffness is increased while the aging evaluation of the asphalt over a long period of time, and the rate of change of the stiffness is decreased. As a result, the low temperature characteristics of the asphalt are generally degraded. Therefore, the asphalt produced using the conventional wax-based modifier has a disadvantage that it acts as a factor causing low-temperature cracking.

This patent is aimed at providing a medium-temperature ascon production method as a novel composition modifier that complements the disadvantages of a general polyethylene wax-based resin and also as a preferable utilization method of a new wax-based modifier.

1. Korean Patent No. 10-0800121 2. Korean Patent No. 10-0823352 3. Korean Patent No. 10-0912403

It is an object of the present invention to provide an asphalt modifier composition capable of exhibiting a public grade of PG 76-22 or higher at a lower optimum temperature and compaction temperature than a conventional high temperature asphalt mixture (HMA), and a mesophilic asphalt mixture prepared using the same.

The asphalt modifier composition according to the present invention may contain an amide wax and a dispersant.

In the asphalt modifier composition according to the present invention, the asphalt modifier composition may contain 1 to 70% by weight of the amide wax.

In the asphalt modifier composition according to the present invention, the asphalt modifier composition may further contain 50 wt% or less of polyethylene wax.

In the asphalt modifier composition according to the present invention, the amide wax may be a condensation reaction product of a fatty acid having a carbon number of 14 or more and a polyamine.

In the asphalt modifier composition according to the present invention, the polyethylene wax may be a polyethylene-modified wax.

In the asphalt modifier composition according to the present invention, the dispersant may be at least one selected from amide, amine, polybutene succinimide, polyolefin amines, polyether amines, paraffin dispersants which are derivatives of fatty amines, paraffin block copolymers which are derivatives of fatty amines, , Amidoalkanols containing condensation products of alkylarylamines, polycyclic acids, derivatives of polycyclic acids, saturated / unsaturated fatty acid derivatives, 4-alkyl-2-morpholinone and alkylphenoxypolyoxyalkyleneamines Amines, and polyisobutylene amines. [0033] The term " a "

In the asphalt modifier composition according to the present invention, the asphalt modifier composition can be mixed and prepared by heating and melting the amide wax and the dispersant.

In the asphalt modifier composition according to the present invention, the asphalt modifier composition can be mixed and prepared by heating and melting the amide wax and the dispersant.

Meanwhile, in the asphalt mixture containing the aggregate and the asphalt, the asphalt mixture may be prepared by adding 0.5 to 20 parts by weight of the asphalt modifier composition to 100 parts by weight of the asphalt.

At this time, the asphalt mixture may have a public grade of PG 76-22 or higher.

The asphalt modifier composition according to the present invention improves the resistance to plastic deformation without increasing the viscosity of asphalt when mixed with asphalt, and has an effect of compensating a phenomenon of degradation of low temperature properties of asphalt.

According to the asphalt mixture according to the present invention, when the asphalt pavement is applied, the construction temperature can be lowered to enable the middle temperature construction, the cost of the ascon produced fuel can be reduced, the generated noxious gas can be reduced, It has the effect of reducing the traffic regulation time by shortening the time.

Hereinafter, the asphalt modifier composition according to the present invention and the asphalt mixture prepared using the same will be described in detail with reference to the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the following drawings may be exaggerated in order to clarify the spirit of the present invention. Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

 The present invention relates to an asphalt modifier composition which is used by mixing asphalt, aggregate and the like to prepare an asphalt mixture so as to lower the compaction temperature of the heated asphalt mixture.

In the modifier composition for an asphalt mixture according to the present invention, polyethylene wax, amide wax derived from plants, or a mixture thereof may be used as the modified wax. Preferably, such a modified wax may be made of a mixture by heating and melting with a dispersant.

Specifically, the modifier composition for an asphalt mixture according to the present invention may be prepared to contain an amide wax and a dispersant. The asphalt modifier composition according to the present invention may be prepared to contain 1 to 70% by weight of an amide wax.

In the asphalt modifier composition according to the present invention, the amide wax may be derived from a plant. Specifically, the amide wax may be a plant-derived long chain fatty acid such as myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, And condensation reaction products of polyamines such as ethylenediamine, propylenediamine, butylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and the like. Such amide wax may have a melting point in the range of 120 캜 to 150 캜. At this time, the long-chain fatty acid may have a carbon number of 14 or more, but as a practical example, the long-chain fatty acid may preferably have a carbon number of 14 or more and 30 or less. It is more preferable to use a long chain fatty acid having 14 to 20 carbon atoms.

At this time, the amide wax may be contained in an amount of 1 to 70% by weight to improve the viscosity increase inhibition efficiency of the asphalt mixture by the addition of the asphalt modifier composition. On the other hand, if the amount of the amide wax is less than 1 wt%, it is difficult to expect the asphalt viscosity increase inhibition effect by the prepared asphalt modifier composition. If the amide wax content exceeds 70 wt%, the viscosity of the asphalt mixture Is excessively lowered to produce an asphalt mixture unsuitable for asphalt construction.

The dispersant constituting the remaining amount of the asphalt modifier composition according to the present invention may affect not only the asphalt modifier composition according to the present invention but also the uniform mixture of the asphalt mixture prepared using the same. Such a dispersant may be selected from among amides, amines, polybutene succinimides, polyolefin amines, polyether amines, and the like, and more specifically amides, amines, polybutene succinic acids, Paraffin block copolymers which are derivatives of fatty amines, polyolefin amines, alkylaryl amines, polycyclic acids, derivatives of polycyclic acids, saturated or unsaturated fatty acids, such as, for example, amines, polyolefin amines, polyether amines, paraffin dispersants which are derivatives of fatty amines, Derivatives, amido alkanolamine containing a condensation product of 4-alkyl-2-morpholinone and alkylphenoxy polyoxyalkylene amine, and polyisobutylene amine. Lt; / RTI >

And, the asphalt modifier composition according to the present invention can be produced so as to further contain polyethylene wax. The polyethylene wax regulates the degree of crystallization of the asphalt mixture by the addition of the asphalt modifier composition, which may compensate for the lowering of the low temperature properties of the asphalt.

And, in the asphalt modifier composition according to the present invention, such a polyethylene wax may be a polyethylene-modified wax. Specifically, the polyethylene wax may be a polyethylene oxide wax. More specifically, the polyethylene oxide wax may preferably have a melt index of 0.3 g / 10 min to 3.0 g / 10 min (ASTM D1238) It may be more preferable that the softening point is 85 占 폚 to 115 占 폚 (ASTM D1525).

In the asphalt modifier composition according to the present invention, the polyethylene wax is prepared so as to be contained in an amount of 50 wt% or less. When the polyethylene wax is contained in an amount of more than 50 wt% in the asphalt modifier composition according to the present invention, An unsuitable asphalt mixture may be produced that causes low temperature property deterioration in which cracking occurs at a temperature. At this time, the polyethylene wax may be contained in an amount of 50 wt% or less, but may be preferably 5 wt% or more and 50 wt% or less.

The asphalt modifier composition prepared by mixing as described above may be a mixture prepared by mixing, heating and melting the plant-derived amide wax and the dispersant. Or the asphalt modifier composition may be a mixture prepared by mixing, heating and melting plant-derived amide wax, dispersant and modified polyethylene wax. At this time, the prepared mixture may be in the form of spherical, pellet, paste, or molten compound.

Meanwhile, the asphalt mixture may be prepared by adding the asphalt modifier composition according to the present invention. The asphalt mixture may be a mesophase asphalt mixture. Specifically, the asphalt mixture according to the present invention is an asphalt mixture comprising an aggregate and asphalt, wherein 0.5 to 50 parts by weight of the asphalt modifier composition according to the present invention is further added to 100 parts by weight of the asphalt prepared beforehand .

If the addition amount of the asphalt modifier composition according to the present invention is less than 0.5 parts by weight based on 100 parts by weight of the asphalt, the value of G * / sin? Before aging of the modified asphalt at 76 ° C becomes lower than 1.0 kPa, G * | / sin? Value after the RTFO treatment was lower than 2.2 kPa, so that the high temperature grade of PG 76 could not be obtained and at m-12 ° C (PG-22) Value value is lower than 0.30, so it may not be possible to satisfy the low temperature grade of PG-22 according to the regulations.

If the addition amount of the asphalt modifier composition according to the present invention exceeds 20 parts by weight based on 100 parts by weight of the asphalt, the asphalt prepared according to the present invention at 76 占 폚 satisfies the value of | G * | / sin? Before aging of 1.0 kPa , The value of G * | / sin δ after the RTFO treatment satisfies 2.2 kPa to obtain the high-temperature rating of PG 76 and the m-value at minus 12 ° C (PG-22) It is possible that the asphalt modifier composition is excessively added during the production of the asphalt mixture, which may be undesirable from the economical point of view.

That is, in order to satisfy the commercial grade "PG 76-22 " of the mixed asphalt mixture according to the addition of the asphalt modifier composition according to the present invention, the asphalt modifier composition according to the present invention The addition may be preferably added in an amount of 0.5 to 50 parts by weight based on 100 parts by weight of the asphalt prepared in advance. Further, in consideration of a more economical aspect, it may be more preferable to add 0.5 to 20 parts by weight to 100 parts by weight of the asphalt prepared in advance.

Hereinafter, specific examples of the asphalt modifier composition according to the present invention and the asphalt mixture prepared therefrom are provided. However, it should be understood that these specific embodiments are provided for the purpose of experimentally demonstrating the superiority of the present invention, and the present invention can not be construed as limited by these experimental embodiments.

≪ Preparation of asphalt modifier composition >

(Example 1)

In a 1 L reactor, 250 g of stearic acid bisethylene amide wax and 250 g of succinic acid imide dispersant were added to a 250 mL beaker, which was melted by heating at 150 캜, followed by melt mixing with a stirrer for 30 minutes. The composition ratio of the thus prepared Example 1 is shown in Table 1 below.

(Example 2)

In a 1 L reactor, 125 g of stearic acid bisethylene amide wax, 125 g of a polyethylene oxide wax having a melting point of 2.0 and a melting point of 114 캜, and 250 g of succinic acid imide dispersant were placed in a 250 mL beaker, and the mixture was melted by heating at 150 캜 and melted and mixed by a stirrer for 30 minutes Respectively. The composition ratio of the thus prepared Example 2 is shown in Table 1 below.

(Example 3)

In a 1 L reactor, 375 g of stearic acid bisethylene amide wax and 125 g of succinic acid imide dispersant were added to a 250 mL beaker, and the mixture was melted by heating at 150 캜, followed by melt mixing with a stirrer for 30 minutes. The composition ratio of the thus prepared Example 3 is shown in Table 1 below.

(Example 4)

In a 1 L reactor, 250 g of stearic acid bisethylene amide wax, 250 g of a melt index of 2.0, 125 g of a polyethylene oxide wax having a melting point of 114 캜 and 125 g of succinic acid imide dispersant were placed in a 250 mL beaker and melted by heating at 150 캜 for 30 minutes, Respectively. The composition ratio of the thus prepared Example 4 is shown in Table 1 below.

(Example 5)

In a 1 L reactor, 125 g of stearic acid bisethylene amide wax, a melt index of 2.0, 250 g of polyethylene oxide wax having a melting point of 114 캜, and 125 g of succinic acid imide dispersant were placed in a 250 mL beaker and melted by heating at 150 캜 for 30 minutes, Respectively. The composition ratio of the thus prepared Example 5 is shown in Table 1 below.

(Example 6)

In a 1 L reactor, 125 g of stearic acid bisethylene amide wax, a melt index of 2.0, 300 g of polyethylene oxide wax having a melting point of 114 캜, and 75 g of succinic acid imide dispersant were placed in a 250 mL beaker, melted by heating at 150 캜 and melt- Respectively. The composition ratio of the thus prepared Example 6 is shown in Table 1 below.

(Comparative Example 1)

In a 1 L reactor, 500 g of stearic acid bisethylene amide wax was added to a 250 mL beaker, and the mixture was melted by heating at 150 DEG C, and then melt-mixed by a stirrer for 30 minutes. The composition ratio of Comparative Example 1 thus prepared is shown in Table 1 below.

(Comparative Example 2)

In a 1 L reactor, 375 g of stearic acid bisethylene amide wax and a melt index of 2.0 and 125 g of polyethylene oxide wax having a melting point of 114 DEG C were placed in a 250 mL beaker, heated at 150 DEG C for melting, and then melt-mixed for 30 minutes with a stirrer. The composition ratio of Comparative Example 2 thus prepared is shown in Table 1 below.

(Comparative Example 3)

In a 1 L reactor, 250 g of stearic acid bisethylene amide wax and 250 g of a melt index of 2.0 and 250 g of polyethylene oxide wax having a melting point of 114 캜 were added to a 250 mL beaker, which was melted by heating at 150 캜 and melt-mixed for 30 minutes with a stirrer. The composition ratio of Comparative Example 3 thus prepared is shown in Table 1 below.

Plant-derived amide wax (wt.%) Modified polyethylene wax (wt%) Dispersant (wt.%) Example 1 50 - 50 Example 2 25 25 50 Example 3 75 - 25 Example 4 50 25 25 Example 5 25 50 25 Example 6 25 60 15 Comparative Example 1 100 - - Comparative Example 2 75 25 - Comparative Example 3 50 50 -

≪ Preparation of asphalt mixture >

(Examples 6 to 10 and Comparative Examples 4 to 6)

Asphalt mixtures were prepared by using the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 3, and were shown in Examples 6 to 10 and Comparative Examples 4 to 6 in order. 3 parts by weight of each asphalt modifier composition was added to 100 parts by weight of AP-5 (asphalt) heated to 130 캜 at the time of preparation, and then the mixture was stirred for 30 minutes using a high temperature shear mixer at 2,000 rpm to completely add the asphalt modifier composition And melted.

(Comparative Example 7)

The asphalt mixture was prepared as described above but without adding the asphalt modifier composition.

<Physical Properties of Asphalt Mixture>

The long-term aging simulation (PAV) of asphalt and packaged asphalt after the short-term aging (RFTO) treatment of asphalt and packaging asphalt of each of the asphalt mixtures prepared in Examples 6 to 11 and Comparative Examples 4 to 7 was conducted. Table 2 shows the physical properties of the asphalt after the pressure aging treatment.

For the evaluation of physical properties, the stiffness and m-value of asphalt after PAV KSF 2392: 2004 for pre-aging asphalt viscosity, KSF 2393: 2009 for G * | / sinδ (76 ° C, kPa) It was analyzed by the test method specified in KSF 2390: 2009.

division Asphalt before aging
(Original) Asphalt after RFTO Asphalt after PAV Viscosity
(95 &lt; 0 &gt; C, cP) Viscosity
(125 &lt; 0 &gt; C, cP) Viscosity
(145 &lt; 0 &gt; C, cP) | G * | / sin?
(76 DEG C, kPa) | G * | / sin?
(76 DEG C, kPa) Stiffness
(-12 &lt; 0 &gt; C, MPa) m-value
(-12 C) Example 6 16200 458 188 1.91 2.58 259 0.319 Example 7 15800 650 215 1.58 2.65 229 0.319 Example 8 13150 721 245 1.69 2.51 230 0.315 Example 9 12170 540 200 1.70 2.67 235 0.311 Example 10 49000 678 230 1.64 2.46 240 0.310 Example 11 42000 650 220 1.54 2.26 220 0.302 Comparative Example 4 16210 968 348 1.56 2.12 212 0.280 Comparative Example 5 9040 876 316 1.32 2.02 223 0.312 Comparative Example 6 4632 660 248 0.98 1.45 198 0.270 Comparative Example 7 6784 828 296 0.62 1.20 189 0.313

Referring to [Table 2], it can be seen that, in the asphalt viscosity measurement before aging of the Examples and Comparative Examples, the viscosity decreases as the temperature is generally increased.

In the case of the asphalt mixture to which the asphalt modifier composition according to the present invention of Examples 6 to 10 is added, the value of | G * | / sin? Satisfies 1.0 kPa and the value of | G * | / It is confirmed that the high temperature grade of PG 76 can be obtained satisfying the 2.2 kPa and the m-value becomes higher than 0.30 at -12 ° C (PG-22), thus satisfying the low temperature grade of PG-22 .

On the other hand, it can be seen that Comparative Examples 4 to 7 do not satisfy the public grade "PG 76-22 ".

Thus, it can be seen that the addition of the asphalt modifier composition according to the present invention makes it possible to produce a mesophase asphalt mixture of excellent quality satisfying the public grade "PG 76-22 ".

As described above, the asphalt modifier composition according to the present invention improves the resistance to plastic deformation without increasing the viscosity of asphalt and improves the low temperature property of asphalt when mixed with asphalt.

Further, according to the asphalt mixture according to the present invention, when the asphalt pavement is applied, the construction temperature can be lowered to enable the middle temperature construction, the cost of the ascon produced fuel can be reduced, the generated noxious gas can be reduced, There is an effect that can be done.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will recognize that many modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (10)

An amide wax, a polyethylene wax, and a succinate imide, wherein the amide wax is a condensation product of a fatty acid having a carbon number of 14 or more and a polyamine. The method according to claim 1,
The asphalt modifier composition
And 1 to 70% by weight of the amide wax. 3. The method according to claim 1 or 2,
Wherein said asphalt modifier composition further comprises up to 50 weight percent of polyethylene wax. delete The method of claim 3,
Wherein the polyethylene wax is a polyethylene modified wax. delete The method according to claim 1,
The asphalt modifier composition
Wherein the amide wax, the polyethylene wax and the succinate imide as a dispersant are mixed by heating and melting. delete In an asphalt mixture comprising aggregate and asphalt,
With respect to 100 parts by weight of the asphalt,
And 0.5-20 parts by weight of the asphalt modifier composition according to claim 1. 10. The method of claim 9,
Said asphalt mixture having a public grade PG 76-22 or higher.