KR101242313B1 - Asphalt composition with high temperature stability - Google Patents

Abstract

The present invention relates to an asphalt composition having improved thermal stability by suppressing deterioration due to oxygen or heat at a high temperature, comprising 100 parts by weight of asphalt; And 1 to 20 parts by weight of a vinyl branched aromatic hydrocarbon-conjugated diene block copolymer, a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer, and a vinyl aromatic hydrocarbon-conjugated diene block copolymer composition comprising an antioxidant. To provide. According to the present invention, it is possible to provide an asphalt composition having improved thermal stability at high temperature by using a triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer.

Description

Asphalt composition with high temperature stability

The present invention relates to an asphalt composition, and more particularly, to an asphalt composition that can significantly improve thermal stability by using a triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer.

Unmodified asphalt is limited in use due to problems such as plastic deformation at high temperatures and cracks at low temperatures. In order to improve these problems, studies have been conducted to improve physical properties by adding various polymers.

Vinyl aromatic hydrocarbon-conjugated diene block copolymers such as styrene-butadiene-styrene block copolymers exhibit excellent effects at high temperature and low temperature properties, and thus they are most widely used in industrial fields such as road pavement and roof waterproofing as contained in asphalt.

In the case of road or waterproof asphalt composition, the flow resistance at high temperature and the bending property at low temperature are the main property evaluation factors. The asphalt composition for roads should be stored for several hours or sometimes several days at 150 to 160 ° C., which is hot due to the transport or pavement atmosphere for paving the roads, and the styrene-butadiene-styrene air contained in the asphalt composition due to the high temperature. The coalescence decomposes, causing a problem that the softening point of the asphalt composition is lowered.

US Patent US04485201 discloses an antioxidant that provides heat resistance to a blend composed mainly of waste tire rubber powder and styrene-butadiene-styrene block copolymer (linear or branched) on asphalt, and a hydrogenated rosin-based tackifier for increasing adhesion. An asphalt composition to which a processing oil is added as a tackifying agent, a plasticizer or a softener is provided.

Disclosure of Invention The present invention aims to provide an asphalt composition capable of suppressing deterioration due to oxygen or heat by using a tri-branched vinyl aromatic hydrocarbon-conjugated diene block copolymer. .

The present invention 100 parts by weight of asphalt to achieve the above object; And 1 to 20 parts by weight of a vinyl branched aromatic hydrocarbon-conjugated diene block copolymer, a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer, and a vinyl aromatic hydrocarbon-conjugated diene block copolymer composition comprising an antioxidant. To provide.

In the present invention, the asphalt composition is a vinyl aromatic hydrocarbon-conjugated diene block copolymer composition is a linear vinyl aromatic hydrocarbon to the total content of the tri-branched vinyl aromatic hydrocarbon-conjugated diene block copolymer and the linear vinyl aromatic hydrocarbon-conjugated diene block copolymer The weight ratio of conjugated diene block copolymer is 0.1 to 0.8, more preferably 0.15 to 0.45.

In the present invention, the antioxidant is at least one selected from the group consisting of phenolic antioxidants, amine antioxidants, and sulfur-based antioxidants.

In the present invention, the vinyl aromatic hydrocarbon monomers include styrene, alpha methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 1-vinylnaphthalene, 4-cyclohexylstyrene, 4- (p-methylphenyl) styrene, And 1-vinyl-5hexyl naphthalene.

In the present invention, conjugated diene monomers include 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, piperiene, 3-butyl-1,3-octadiene, isoprene, and 2-phenyl-1, It is 1 or more types chosen from the group which consists of 3-butadiene.

In the present invention, the vinyl aromatic hydrocarbon-conjugated diene block copolymer is characterized in that the content of the vinyl aromatic hydrocarbon is 5 to 50 parts by weight based on 100 parts by weight of the vinyl aromatic hydrocarbon-conjugated diene block copolymer.

In the present invention, the vinyl aromatic hydrocarbon-conjugated diene block copolymer has a number average molecular weight of 10,000 to 1,000,000 g / mol.

In the present invention, the vinyl aromatic hydrocarbon-conjugated diene block copolymer is polymerized with at least one monomer in which the vinyl aromatic hydrocarbon is selected from the group consisting of styrene and methylstyrene, and the conjugated diene is at least one monomer selected from the group consisting of butadiene and isoprene. It is characterized in that the polymerization.

According to the present invention, since the asphalt composition includes a tri-branched vinyl aromatic hydrocarbon-conjugated diene block copolymer, the effect of cleavage of double bonds in the vinyl aromatic hydrocarbon-conjugated diene block copolymer by oxygen or heat when stored for a long time at high temperature Compared with conventional asphalt compositions containing linear vinyl aromatic hydrocarbon-conjugated diene block copolymers, the effect of oxygen or heat deterioration of the double bonds contained in the butadiene block on the asphalt composition is reduced even after prolonged storage at high temperature, thereby reducing the softening point. It is possible to provide asphalt compositions with new and heterogeneous effects in which the reduction is markedly reduced and the thermal stability is greatly improved.

FIG. 1 is a graph showing gel permeation chromatography results of an asphalt composition comprising a linear diblock copolymer and an asphalt composition simultaneously comprising a tribranched block copolymer and a linear block copolymer according to 5 hours at 180 ° C. in an oven.
FIG. 2 is a graph illustrating gel permeation chromatography results of an asphalt composition including a linear diblock copolymer and a asphalt composition including a triple branched block copolymer and a linear block copolymer according to 10 hours of 180 ° C. oven storage.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail including an Example.

In order to increase the elastic modulus and strength of asphalt, to prevent low temperature embrittlement, and to increase the viscosity at high temperatures, it is generally known to use an existing vinyl aromatic hydrocarbon-conjugated diene block copolymer mixed with asphalt. When triarm vinyl aromatic hydrocarbon-conjugated diene block copolymers are mixed into the asphalt composition, they are included in the butadiene block even after prolonged storage at high temperature, compared to the case of using a conventional linear vinyl aromatic hydrocarbon-conjugated diene block copolymer. Degradation by the oxygen or heat of the double bond is reduced to the asphalt composition is significantly reduced the reduction of the softening point, to confirm the new and heterogeneous effect that the thermal stability is significantly improved to complete the present invention.

Tri-branched vinyl aromatic hydrocarbon-conjugated diene block copolymer

In order to minimize the effect of the breakage of the double bond in the vinyl aromatic hydrocarbon-conjugated diene block copolymer by oxygen or heat when stored for a long time at high temperature, and to keep the decrease in softening point temperature small compared with the conventional asphalt composition, and to improve thermal stability, Asphalt compositions according to the invention comprise triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymers.

The reaction mechanism for heat and oxygen oxidation in which hydrocarbon double bonds are cleaved by heat or oxygen oxidation is shown in Scheme 1.

[Reaction Scheme 1]

As shown in Scheme 1, the double bond is cleaved by oxygen (O ₂ ) to form a carbonyl group. In particular, the cleavage of the double bond by oxygen occurs easily. In deterioration by oxygen, oxygen concentration, temperature, etc. are influential factors.

Compared with the existing linear vinyl aromatic hydrocarbon-conjugated diene block copolymers, the triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer has a small effect of molecular weight reduction when the double bonds present in the butadiene block are cleaved by oxygen or heat. . Therefore, the softening point reduction of the asphalt composition containing the tri-branched vinyl aromatic hydrocarbon-conjugated diene block copolymer is significantly reduced compared to the softening point reduction of the asphalt composition including the conventional linear vinyl aromatic hydrocarbon-conjugated diene block copolymer.

Asphalt composition according to the present invention is to increase the elastic modulus and strength, 100 parts by weight of asphalt to prevent the increase in low temperature brittleness; And 1 to 20 parts by weight of a vinyl branched aromatic hydrocarbon-conjugated diene block copolymer, a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer, and a vinyl aromatic hydrocarbon-conjugated diene block copolymer composition comprising an antioxidant. To provide.

When the content of the vinyl aromatic hydrocarbon-conjugated diene block copolymer composition is less than 1 part by weight based on 100 parts by weight of asphalt, the effect of improving the thermal stability of the modified asphalt composition is less, and when the content of the vinyl aromatic hydrocarbon is greater than 20 parts by weight. -It is difficult to uniformly dissolve the conjugated diene block copolymer composition in asphalt, the processability of the modified asphalt is poor, and the production cost increases because the vinyl aromatic hydrocarbon-conjugated diene block copolymer composition is higher than that of asphalt, resulting in economical efficiency of the modified asphalt composition. This decreases.

The vinyl aromatic hydrocarbon-conjugated diene block copolymer composition is a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer with respect to the total content of a tri-branched vinyl aromatic hydrocarbon-conjugated diene block copolymer and a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer. The weight ratio of is 0.1 to 0.8, more preferably 0.15 to 0.45. When the weight ratio of the linear vinyl aromatic hydrocarbon-conjugated diene block copolymer and the linear vinyl aromatic hydrocarbon-conjugated diene block copolymer to the total content of the triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer is less than 0.1, the triple branch vinyl aromatic It is not preferable because the time for dissolving the composition of the hydrocarbon-conjugated diene block copolymer and the linear vinyl aromatic hydrocarbon-conjugated diene block copolymer increases in asphalt, and if it exceeds 0.8, the triple branched vinyl aromatic hydrocarbon-conjugated diene block Since the content of the copolymer is small, the stability against deterioration of the asphalt composition by oxygen or heat is not preferable because there is no improvement effect compared with the conventional asphalt composition.

Hereinafter, unless otherwise specified, the vinyl aromatic hydrocarbon-conjugated diene block copolymer includes triple branched and linear vinyl aromatic hydrocarbon-conjugated diene block copolymers.

In the preparation of the vinyl aromatic hydrocarbon-conjugated diene block copolymer, the content ratio of the triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer and the linear vinyl aromatic hydrocarbon-conjugated diene block copolymer can be controlled by coupling reaction with various coupling agents. . For example, a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer can be prepared using a dichloro silane, an alkyl ester, or an aromatic ester, which has two reactor coupling agents, and trichloro silane as a coupling agent having three reactors. , Monoepoxy aromatic esters, monoepoxy alkyl esters, epoxidized soybean oil oils can be used to prepare triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymers, and to control the molar ratio of the coupling agent having three reactors or A mixture of triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymers and linear vinyl aromatic hydrocarbon-conjugated diene block copolymers having various content ratios is obtained by simultaneously using a coupling agent having three reactors and a coupling agent having three reactors. Can be.

Vinyl aromatic hydrocarbon monomers used in the tri-branched and linear vinyl aromatic hydrocarbon-conjugated diene block copolymers of the vinyl aromatic hydrocarbon-conjugated diene block copolymer of the present invention are styrene, alpha methyl styrene, 3-methyl styrene, 4-methyl styrene, 4-propyl styrene, 1-vinyl naphthalene, 4-cyclohexyl styrene, 4- (p-methylphenyl) styrene, or 1-vinyl-5 hexyl naphthalene can be used individually or in combination of 2 or more types.

In addition, 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, piperiene, 3-butyl-1,3-octadiene, isoprene, or 2-phenyl-1,3- as a conjugated diene monomer Butadiene can be used individually or in combination of 2 or more types.

Here, more preferably, styrene or methyl styrene can be used alone or in parallel as the vinyl aromatic hydrocarbon, butadiene or isoprene can be used alone or in parallel as the conjugated diene.

When the block copolymer is used, the content of each block may be varied and mixed. The vinyl aromatic hydrocarbon-conjugated diene block copolymer preferably has a content of vinyl aromatic hydrocarbon of 5 to 50 parts by weight based on 100 parts by weight of the vinyl aromatic hydrocarbon-conjugated diene block copolymer. When the content of the vinyl aromatic hydrocarbon is less than 5 parts by weight with respect to 100 parts by weight of the vinyl aromatic hydrocarbon-conjugated diene block copolymer, the vinyl aromatic hydrocarbon block is difficult to form a physical crosslinking point, resulting in a decrease in the physical properties of the asphalt and exceeding 50 parts by weight. Has poor solubility in asphalt and low temperature properties.

In addition, the vinyl aromatic hydrocarbon-conjugated diene block copolymer may have a number average molecular weight of 10,000 to 1,000,000 g / mol and may be linear or branched. When the number average molecular weight of the vinyl aromatic hydrocarbon-conjugated diene block copolymer is less than 10,000 g / mol, the number average molecular weight of the vinyl aromatic hydrocarbon block is too small to degrade the high temperature properties, and when the vinyl aromatic hydrocarbon-conjugated diene block copolymer exceeds 1,000,000 g / mol, Solubility is bad.

Styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS) block copolymers, etc. may be used as the tri-branched or linear vinyl aromatic hydrocarbon-conjugated diene block copolymer polymerized with the monomer. You may mix and use it above, and it is more preferable to use styrene-butadiene-styrene (SBS).

Antioxidant

Antioxidants that can be used in the asphalt composition of the present invention include phenolic antioxidants, amine antioxidants, sulfur antioxidants, and the like. N-octadecyl-3- (3,5-di-t-butyl 4-hydroxyphenyl) propionate, 2,6-di-tert-butyl-p-cresol, 4,6-bis (dodecylthiomethyl) -o-cresol, 4,6-bis (octylthiomethyl ) -o-cresol, Bbenzenepropionic acid, 3,5-bis (1,1-dimethyl-ethyl) -4-hydroxy-C7-9 branched alkyl ester, tris (nonylphenyl) phosphite, 4,4 '-Butylidene-bis (3-methyl-6-tert-butylphenyl) tridecanyl phosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl) octylphosphite, tris (2 , 4-di-tert-butylphenyl) phosphite, poly 4,4'-isopropylidenediphenol-C12-15 alcohol phosphite may be used alone or in combination of two or more, and known as antioxidants. Can be used without

In the present invention, the content of the antioxidant is based on 100 parts by weight of the triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer, or the triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer and the linear vinyl aromatic hydrocarbon-conjugated diene block air It is preferably 0.1 to 3 parts by weight, more preferably 0.3 to 1.5 parts by weight based on 100 parts by weight of the total content of the copolymer. When the content of the antioxidant is less than 0.1 parts by weight based on 100 parts by weight of the vinyl aromatic hydrocarbon-conjugated diene block copolymer, it is not preferable to effectively prevent oxidation of the vinylaromatic hydrocarbon-conjugated diene block copolymer, which is more than 3 parts by weight. In this case, the absolute amount of the polymer product is reduced, which may cause a decrease in the properties of the application field, and an antioxidant more than necessary for the antioxidant effect is added, which is not commercially desirable due to the increase in the cost of the product.

asphalt

Asphalt is obtained as a residue when refining crude oil, mainly composed of hydrogen and carbon, consisting of hydrocarbon compounds combined with a small amount of nitrogen, sulfur or oxygen.

Examples of asphalt include straight asphalt, cutback asphalt, goose asphalt, blown asphalt, emulsified asphalt or sebum (PG) grade asphalt.

Straight asphalt is a final residue obtained by distilling crude oil in atmospheric pressure distillation tower (CDU) and then distilling the atmospheric residual oil (AR) under reduced pressure again. It contains a lot of bitumen which does not decompose and can be used as a raw material for various petroleum asphalt. have. Commercialized straight asphalt is AP-3, AP-5, etc. supplied by SK Energy or GS Caltex.

According to the present invention, a mixture of an antioxidant, a triple branched vinyl aromatic hydrocarbon-conjugated diene block copolymer and a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer is combined with asphalt in a high speed shear mixer to obtain a modified asphalt composition.

The mixing procedure of the modified asphalt composition is as follows. The mixing procedure of the modified asphalt composition is as follows. The asphalt is placed in a 1 L container and maintained at a temperature of 150 ° C. for 1 hour to 1 hour 30 minutes, and when the mixture is sufficiently melted, the vinyl aromatic hydrocarbon-conjugated diene block copolymer composition is introduced into the asphalt while gradually increasing the stirring speed. The stirrer speed is maintained at 2500 rpm and stirred for 2 hours while adjusting to 170 ° C. The modified asphalt composition thus prepared is stored in an oven at 180 ° C. for a certain period of time, and then the softening point at high temperature is measured.

The modified asphalt composition thus prepared is stored in an oven at 180 ° C. for a predetermined time, and a softening point having high temperature properties is measured.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

[Example]

Example 1

4,560 g of purified cyclohexane and 279 g of styrene were injected into a 10 L reactor with nitrogen, and then maintained at 60 ° C. 1.05 g of n-butyllithium as an initiator was added to the reactor to polymerize styrene. Five minutes after the polymerization temperature reached the highest temperature, 621 g of butadiene was injected to produce a butadiene block at the end of the polymerized styrene block. After the completion of the butadiene polymerization, 0.82 g of trichloromethylsilane, a coupling agent, was administered to proceed with the coupling reaction, and 0.3 g of water was added to the polymerization solution to terminate the polymerization reaction. N-octadecyl-3- (3) 3.6 g of, 5-di-t-butyl-4-hydroxyphenyl) propionate and 8.1 g of trisnonyl phenyl phosphite were added to give a triple branched styrene-butadiene weight ratio of styrene and butadiene 31:69. A styrene block copolymer composition was obtained. The prepared styrene-butadiene-styrene block copolymer composition has a content ratio of the linear styrene-butadiene-styrene block copolymer to the total content of the triple branched styrene-butadiene-styrene block copolymer and the linear styrene-butadiene-styrene block copolymer. Became.

The triple branched styrene-butadiene-styrene block copolymer composition prepared above was subjected to high performance gel permeation chromatography (GPC) to measure the number average molecular weight. The detector used a Waters 2414 refractive index detector, the column temperature was 38 ° C. and the solvent was THF. As a result, the number average molecular weight of the styrene-butadiene-styrene block copolymer was 165,000 g / mol and the coupling efficiency was 85%.

The prepared tri-branched styrene-butadiene-styrene block copolymer composition solution was introduced into hot water at 95 ° C. with a dispersant to remove the solvent, thereby obtaining a tri-branched styrene-butadiene-styrene block copolymer composition. Thereafter, the remaining solvent and water were removed through vacuum dehydration and oven drying to obtain a styrene-butadiene-styrene block copolymer. The resulting crumbs were sifted and only 2 mesh through 14 mesh residues were used in the experiment to minimize the effect of particle size.

N-octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propio, an antioxidant, based on 100 parts by weight of the triple branched styrene-butadiene-styrene block copolymer obtained by the method described above A styrene-butadiene-styrene block copolymer composition was prepared such that 0.4 parts by weight of nate and 0.9 parts by weight of tris (nonyl phenylphosphite).

32 g of the triple branched styrene-butadiene-styrene block copolymer composition including the prepared antioxidant and 600 g of asphalt were blended with a high-speed shear mixer for 2 hours to obtain a modified asphalt composition, and the mixture was dried at 180 ° C. in 0, 5, Softening point was measured after storage for 10, 17 and 24 hours. The asphalt used is an AP 5 grade product with a softening point of 47 ° C and 180 ° C viscosity of 125 cPs.

Softening point

It was measured according to KS M 2250.

Example 2

The coupling agent is trichloromethylsilane so that the content ratio of the linear styrene-butadiene-styrene block copolymer to the total content of the triple branched styrene-butadiene-styrene block copolymer and the linear styrene-butadiene-styrene block copolymer is 0.45. It is the same as Example 1 except the coupling reaction was carried out by administering 1.06 g.

Comparative Example 1

In order that the content ratio of the linear styrene-butadiene-styrene block copolymer to the total content of the triple branched styrene-butadiene-styrene block copolymer and the linear styrene-butadiene-styrene block copolymer becomes 0.05, the trichloromethylsilane The same procedure as in Example 1 except that 0.74 g was administered for the coupling reaction.

Comparative Example 2

In order to obtain a linear styrene-butadiene-styrene block copolymer, the coupling agent was the same as in Example 1 except that the coupling reaction was carried out by administering 1.04 g of dichlorosilane.

Comparative Example 3

The coupling agent is trichloromethylsilane so that the content ratio of the linear styrene-butadiene-styrene block copolymer to the total content of the triple branched styrene-butadiene-styrene block copolymer and the linear styrene-butadiene-styrene block copolymer is 0.77. It is the same as Example 1 except the coupling reaction was carried out by administering 1.14 g.

The modified asphalt physical property measurement results of the above Examples and Comparative Examples are shown in Table 1.

Table 1 shows triple branched styrene-butadiene-styrene block copolymers based on 100% by weight total content of triple branched styrene-butadiene-styrene block copolymers, linear styrene-butadiene-styrene block copolymers, antioxidants, and asphalt. , The composition and softening point of the asphalt composition with a total content of linear styrene-butadiene-styrene block copolymers and antioxidants of 5% by weight.

As can be seen in Table 1, it can be seen that as the tri-branched styrene-butadiene-styrene block copolymer content increases, the retention time of 90% or more of the initial softening point of the asphalt composition increases according to the oven storage time. In the case of the existing linear styrene-butadiene-styrene block copolymer, it is decomposed at the double bond of butadiene, which is the molecular center block, as it increases in the oven storage time, so that it is decomposed into the styrene-butadiene double block copolymer, thereby rapidly decreasing the molecular weight. It is thought that this is because the softening point decreases rapidly. On the other hand, in the case of triple branched styrene-butadiene-styrene block copolymers, decomposition does not occur all at once but only one of the three may be seen that the softening point decrease is delayed compared to the linear block copolymer. This can be clearly seen from the GPC results shown in FIGS. 1 and 2.

In addition, when the content of the tri-branched block copolymer is 95% by weight based on the total weight of the tri-branched and linear block copolymer, the dissolution time is increased by about 60 minutes compared to the linear block copolymer, which increases the manufacturing time of the modified asphalt. In order to have a similar dissolution time, the linear block copolymer content ratio to the total content of the tri-branched block copolymer and the linear block copolymer should be in the range of 0.1 to 0.8 to prevent oxygen or heat without affecting the production time of the asphalt composition. It can be seen that the degradation of the asphalt composition is suppressed.

Claims (9)

100 parts by weight of asphalt; And
1 to 20 parts by weight of a vinyl branched aromatic hydrocarbon-conjugated diene block copolymer, a linear vinyl aromatic hydrocarbon-conjugated diene block copolymer, and a vinyl aromatic hydrocarbon-conjugated diene block copolymer composition comprising an antioxidant,
The vinyl aromatic hydrocarbon-conjugated diene block copolymer composition is composed of a linear aromatic hydrocarbon-conjugated diene block copolymer with respect to the total content of the tri-branched vinyl aromatic hydrocarbon-conjugated diene block copolymer and the linear vinyl aromatic hydrocarbon-conjugated diene block copolymer. Asphalt composition, characterized in that the weight ratio is 0.15 to 0.45. delete delete The asphalt composition of claim 1, wherein the antioxidant is at least one selected from the group consisting of phenolic antioxidants, amine antioxidants and sulfur-based antioxidants. The vinyl aromatic hydrocarbon monomer of claim 1, wherein the vinyl aromatic hydrocarbon monomer is styrene, alpha methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 1-vinylnaphthalene, 4-cyclohexylstyrene, 4- (p-methylphenyl) Asphalt composition, characterized in that at least one member selected from the group consisting of styrene, and 1-vinyl-5 hexyl naphthalene. The conjugated diene monomer of claim 1, wherein the conjugated diene monomer is 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, piperiene, 3-butyl-1,3-octadiene, isoprene, and 2-phenyl- Asphalt composition, characterized in that at least one selected from the group consisting of 1,3-butadiene. The asphalt composition of claim 1, wherein the vinyl aromatic hydrocarbon-conjugated diene block copolymer has a content of 5 to 50 parts by weight based on 100 parts by weight of the vinyl aromatic hydrocarbon-conjugated diene block copolymer. The asphalt composition of claim 1, wherein the vinyl aromatic hydrocarbon-conjugated diene block copolymer has a number average molecular weight of 10,000 to 1,000,000 g / mol. The vinyl aromatic hydrocarbon-conjugated diene block copolymer according to claim 1, wherein the vinyl aromatic hydrocarbon is polymerized with at least one monomer selected from the group consisting of styrene and methyl styrene, and the conjugated diene is selected from the group consisting of butadiene and isoprene. Asphalt composition characterized by polymerizing with the above monomers.

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