KR102348472B1 - Rubber modified asphalt and its manufacturing method - Google Patents

Abstract

100 parts by weight of asphalt; 8 to 15 parts by weight of waste tire powder; 18 to 25 parts by weight of a styrene-butadiene block copolymer (SBS); 10 parts by weight to 20 parts by weight of vegetable oil; And 5 parts by weight to 15 parts by weight of the tackifying resin; rubber-modified asphalt comprising a.

Description

Rubber modified asphalt and its manufacturing method

It relates to rubber-modified asphalt and a method for manufacturing the same.

Currently, about 70% of waste tires are recycled as cement kilns and heat aids, and about 20% of waste tires are used for powder processing.

<Treatment status by waste tire usage method>

As for the use of powder, rubber pavement block is a representative recycled product in Korea, but other than that, it is not activated due to economic problems.

Conventional asphalt has cracks or holes due to the temperature difference between winter and summer, and must be filled with asphalt to repair it. It is not easy to combine. Since rubber has a _{negative freezing point (T g} ), it has durability and elasticity to temperature changes in winter and summer, so it is suitable as a material used to fill holes.

Rubber asphalt can be found in a patent in 1843 (see Patent Document 1), and recently in a patent applied in the 1940s (see Patent Document 2), in this patent, a method of manufacturing rubber asphalt by recycling waste tires this is me Also, rubber asphalt was used for highways in the United States in the 1960s, and since the 1970s, the use has been expanded to the United States, Sweden, Canada, Belgium, France, and Australia. In 1991, the 'Comprehensive Transportation Economic Act', a bill that added 5% of waste tires to asphalt was passed by the US Congress. The Russian Ministry of Transport also used waste rubber for pavement and showed the effect of reducing traffic accidents on frozen roads in winter. In the UK, it has been reported that rubber asphalt reduces noise by 70%.

Despite these advantages, the reason that waste tires are not widely used on roads is that the bond between the used waste tires and asphalt is not due to a chemical bond but is composed of a physical bond, so a complete bond is not achieved, so the temperature difference between winter and summer This is because the asphalt becomes incomplete and cannot withstand the stress caused by the vehicle. For this reason, the bonding force with the hole is weak during the repair of the hole in the asphalt, and the coupling is incomplete.

US88765A US2310712A

Accordingly, in the present invention, it is an object of the present invention to provide a modified rubber asphalt for road repair that improves the conventional incomplete bonding force and withstands temperature differences well for the purpose of using it for asphalt repair work.

In order to achieve the above object, in one aspect of the present invention

100 parts by weight of asphalt; 8 to 15 parts by weight of waste tire powder; 18 to 25 parts by weight of a styrene-butadiene block copolymer (SBS); 10 parts by weight to 20 parts by weight of vegetable oil; And 5 parts by weight to 15 parts by weight of the tackifying resin; rubber-modified asphalt comprising a.

In addition, in another aspect of the present invention

100 parts by weight of asphalt; 8 parts by weight to 10 parts by weight of waste tire powder; 20 to 24 parts by weight of a styrene-butadiene block copolymer (SBS); 12 parts by weight to 14 parts by weight of vegetable oil; And 7 parts by weight to 13 parts by weight of the tackifying resin; rubber-modified asphalt comprising a.

Furthermore, in another aspect of the present invention

100 parts by weight of asphalt; 8 parts by weight to 10 parts by weight of waste tire powder; Styrene-butadiene block copolymer (SBS) 23 parts by weight to 24 parts by weight; 12 parts by weight to 14 parts by weight of vegetable oil; and 7 parts by weight to 13 parts by weight of the tackifying resin;

The mixing ratio of the styrene-butadiene block copolymer, vegetable oil and tackifying resin is 1: 0.5-0.6: rubber-modified asphalt is provided in a weight ratio of 0.3-0.4.

Furthermore, in another aspect of the present invention

heating 100 parts by weight of asphalt to form a gum state;

Forming a mixture by mixing 10 parts by weight to 20 parts by weight of vegetable oil while stirring the asphalt in a gum state;

mixing 18 to 25 parts by weight of a styrene-butadiene copolymer (SBS) to the mixture, and mixing an amount corresponding to 1/2 of 8 to 15 parts by weight of waste tire powder; and

Mixing 5 to 15 parts by weight of the tackifying resin to the mixture, and mixing the waste tire powder corresponding to the remaining 1/2; is provided a method for producing rubber-modified asphalt comprising.

The rubber-modified asphalt provided in one aspect of the present invention has a softening point of 86° C. or higher, and performances such as cone penetration, elastic recovery rate, flow chart, and elongation are suitable for use of asphalt for repair.

1 is a graph showing the softening point of rubber-modified asphalt prepared in Examples 1 to 3 and Comparative Example 1;
2 is a graph showing the softening point of the rubber-modified asphalt prepared in Examples 4, 5, Comparative Examples 2 and 3;
3 is a graph showing the softening point of the rubber-modified asphalt prepared in Example 6 and Comparative Examples 4 to 6;

In one aspect of the invention

100 parts by weight of asphalt; 8 to 15 parts by weight of waste tire powder; 18 to 25 parts by weight of a styrene-butadiene block copolymer (SBS); 10 parts by weight to 20 parts by weight of vegetable oil; And 5 parts by weight to 15 parts by weight of the tackifying resin; rubber-modified asphalt comprising a.

Hereinafter, the rubber-modified asphalt provided in one aspect of the present invention will be described in detail.

The rubber-modified asphalt includes 100 parts by weight of asphalt, and 8 to 15 parts by weight of waste tire powder based on 100 parts by weight of asphalt. As a preferred example, the waste tire powder in the rubber-modified asphalt may include 8 parts by weight to 12 parts by weight, more preferably 8 parts by weight to 10 parts by weight, and most preferably 9 parts by weight to 10 parts by weight. It may include parts by weight, preferably 9 parts by weight to 9.5 parts by weight. By including waste tire powder in the content of the above range in the rubber-modified asphalt, the softening point is 86°C or higher, more preferably 88°C or higher, most preferably 89°C or higher, cone penetration, elastic recovery rate, flow rate, elongation, etc. performance is excellent.

In addition, the waste tire powder preferably has an average particle size of 50 mesh to 100 mesh, and more preferably 60 mesh to 80 mesh. By applying the waste tire powder having a small average particle size as described above, the mixing can be performed uniformly by overcoming the specific gravity difference, which is one of the problems that may occur when mixing asphalt and waste tire powder.

The rubber-modified asphalt includes 100 parts by weight of asphalt, and 18 to 25 parts by weight of styrene-butadiene block copolymer (SBS) based on 100 parts by weight of asphalt. As a preferred example, the styrene-butadiene block copolymer (SBS) in the rubber-modified asphalt may include 19 parts by weight to 24 parts by weight, more preferably 20 parts by weight to 24 parts by weight, most preferably may include 23 parts by weight to 24 parts by weight. By including a styrene-butadiene block copolymer (SBS) in the content of the above range in the rubber-modified asphalt, the softening point is 86°C or higher, more preferably 88°C or higher, most preferably 89°C or higher, cone penetration, elasticity It has excellent performance such as recovery rate, flow chart, and elongation.

The rubber-modified asphalt includes 100 parts by weight of asphalt, and 10 to 20 parts by weight of vegetable oil based on 100 parts by weight of asphalt. As a preferred example, the vegetable oil in the rubber-modified asphalt may include 10 parts by weight to 18 parts by weight, more preferably 10 parts by weight to 16 parts by weight, and most preferably 12 parts by weight to 14 parts by weight. may include wealth. By including vegetable oil in the content of the above range in the rubber-modified asphalt, the softening point is 86 ° C. or higher, more preferably 88 ° C. or higher, and most preferably 89 ° C. or higher, and cone penetration, elastic recovery rate, flow rate, elongation, etc. Performance is excellent.

The rubber-modified asphalt includes 100 parts by weight of asphalt, and 5 to 15 parts by weight of a tackifying resin based on 100 parts by weight of asphalt. As a preferred example, the tackifying resin in the rubber-modified asphalt may include 6 parts by weight to 14 parts by weight, more preferably 7 parts by weight to 13 parts by weight, and most preferably 7.5 parts by weight to 12.5 parts by weight. It may contain parts by weight. By including the tackifying resin in the content of the above range in the rubber-modified asphalt, the softening point is 86 ° C. or higher, more preferably 88 ° C. or higher, and most preferably 89 ° C. or higher, and cone penetration, elastic recovery rate, flow rate, elongation, etc. performance is excellent.

In addition, the mixing ratio of the styrene-butadiene block copolymer, vegetable oil and tackifying resin is preferably 1: 0.5-0.6: 0.3-0.4 by weight. By mixing the styrene-butadiene block copolymer, vegetable oil and tackifying resin in the content within the above range, the softening point is 86°C or higher, more preferably 88°C or higher, and most preferably 89°C or higher, cone penetration degree, elastic recovery rate , flow chart, elongation, etc. performance is excellent.

The rubber-modified asphalt has a softening point of preferably 86 ° C. or higher, preferably 86 ° C. to 95 ° C., more preferably 88 ° C. or higher, most preferably 89 ° C. or higher, and preferably 88 ° C. to 95 ° C., Most preferably, it is 89°C to 95°C. The rubber-modified asphalt according to an embodiment of the present invention may exhibit excellent stability with a softening point of 86°C or higher, preferably 88°C or higher, and 89°C or higher.

In addition, in another aspect of the present invention

heating 100 parts by weight of asphalt to form a gum state;

Forming a mixture by mixing 10 parts by weight to 20 parts by weight of vegetable oil while stirring the asphalt in a gum state;

mixing 18 to 25 parts by weight of a styrene-butadiene copolymer (SBS) to the mixture, and mixing an amount corresponding to 1/2 of 8 to 15 parts by weight of waste tire powder; and

Mixing 5 to 15 parts by weight of the tackifying resin to the mixture, and mixing the waste tire powder corresponding to the remaining 1/2; is provided a method for producing rubber-modified asphalt comprising.

Hereinafter, each step will be described in detail with respect to the manufacturing method of the rubber-modified asphalt provided in another aspect of the present invention.

First, the method for producing rubber-modified asphalt provided in another aspect of the present invention includes heating 100 parts by weight of asphalt to form a gum state.

In the above step, the asphalt is heated to form a liquid state of gum.

Specifically, the heating may be performed at a temperature of 180 °C to 200 °C, and may be performed at a temperature of 185 °C to 190 °C. In addition, stirring may be performed at a rotation speed of 300 rpm to 600 rpm, and stirring may be performed at a rotation speed of 400 rpm to 500 rpm.

Next, the method for producing rubber-modified asphalt provided in another aspect of the present invention includes the step of mixing 10 to 20 parts by weight of vegetable oil while stirring the asphalt in a gum state to form a mixture.

In the above step, before mixing the waste tire powder with the asphalt, the asphalt in a gum state is stirred and vegetable oil is added and mixed.

Specifically, the step of mixing the asphalt and vegetable oil in the gum state to form a mixture may be performed by stirring at a temperature of 180 ° C. to 200 ° C. and a rotation speed of 1000 rpm to 4000 rpm, and at 185 ° C. to 190 ° C. It can be carried out by stirring at a rotation speed of 3000 rpm to 4000 rpm at a temperature. From the mixing process of the asphalt and vegetable oil, by mixing at a high temperature and a high agitation speed, the viscosity of the mixture is lowered and the delivery speed is increased, so that uniform mixing can be performed.

As a preferred example, the vegetable oil may be mixed with 10 parts by weight to 18 parts by weight, more preferably from 10 parts by weight to 16 parts by weight, most preferably from 12 parts by weight to 14 parts by weight. have.

Next, in the method for producing rubber-modified asphalt provided in another aspect of the present invention, 18 to 25 parts by weight of a styrene-butadiene copolymer (SBS) is mixed with the mixture, and 8 to 15 parts by weight of waste tire powder is 1/ and mixing an amount corresponding to 2.

In the above step, before mixing the waste tire powder with the asphalt, the styrene-butadiene copolymer is added to the mixture of the asphalt and vegetable oil in the gum state and mixed, and it is 1/2 of the content of the waste tire powder set for mixing The amount to be mixed first to form a mixture.

At this time, it is preferable to mix the mixture until the mixture becomes a uniform and complete mixture.

In addition, the waste tire powder is pulverized by a room temperature grinding process, so that the average particle size is preferably 50 mesh to 100 mesh, and more preferably 60 mesh to 80 mesh. By using the waste tire powder pulverized by the room temperature grinding process, it is possible to economically manufacture rubber-modified asphalt. The room temperature grinding process may be performed as a three-step process of a crushing process, a grinding process, and a fine powdering process. By applying the waste tire powder having a small average particle size as described above, the mixing can be performed uniformly by overcoming the specific gravity difference, which is one of the problems that may occur when mixing asphalt and waste tire powder.

Furthermore, the waste tire powder may be mixed in an amount corresponding to 1/2 of 8 parts by weight to 15 parts by weight, 4 parts by weight to 7.5 parts by weight, 4 parts by weight to 6 parts by weight, preferably 4 parts by weight to 5 parts by weight may be mixed, more preferably 4.5 parts by weight to 5 parts by weight may be mixed, and most preferably 4.5 parts by weight to 4.75 parts by weight may be mixed.

In addition, the styrene-butadiene block copolymer (SBS) may be mixed in an amount of 19 parts by weight to 24 parts by weight, more preferably 20 parts by weight to 24 parts by weight, and most preferably 23 parts by weight to 24 parts by weight. Parts by weight may be mixed.

Next, the method for producing rubber-modified asphalt provided in another aspect of the present invention includes mixing 5 parts by weight to 15 parts by weight of a tackifying resin in the mixture, and mixing waste tire powder corresponding to the remaining 1/2. .

In the above step, before finally mixing the waste tire powder in the amount corresponding to the other half, the tackifying resin is mixed with the mixture formed in the previous step, and the waste tire powder corresponding to the other half is mixed.

Specifically, the tackifying resin may be mixed with 6 parts by weight to 14 parts by weight, more preferably from 7 parts by weight to 13 parts by weight, and most preferably from 7.5 parts by weight to 12.5 parts by weight. have.

In addition, the waste tire powder may be mixed in an amount corresponding to 1/2 of 8 parts by weight to 15 parts by weight, and 4 parts by weight to 7.5 parts by weight may be mixed, and 4 parts by weight to 6 parts by weight may be mixed, preferably 4 parts by weight to 5 parts by weight may be mixed, more preferably 4.5 parts by weight to 5 parts by weight may be mixed, and most preferably 4.5 parts by weight to 4.75 parts by weight may be mixed.

The rubber-modified asphalt prepared by the above manufacturing method includes: 100 parts by weight of asphalt; 8 parts by weight to 10 parts by weight of waste tire powder; 20 to 24 parts by weight of a styrene-butadiene block copolymer (SBS); 12 parts by weight to 14 parts by weight of vegetable oil; and 7 parts by weight to 13 parts by weight of the tackifying resin.

In addition, the rubber-modified asphalt produced by the above manufacturing method includes 100 parts by weight of asphalt; 8 parts by weight to 10 parts by weight of waste tire powder; Styrene-butadiene block copolymer (SBS) 23 parts by weight to 24 parts by weight; 12 parts by weight to 14 parts by weight of vegetable oil; and 7 parts by weight to 13 parts by weight of the tackifying resin; the mixing ratio of the styrene-butadiene block copolymer, vegetable oil and tackifying resin may be 1: 0.5-0.6: 0.3-0.4 by weight.

The rubber-modified asphalt has a softening point of preferably 86 ° C. or higher, preferably 86 ° C. to 95 ° C., more preferably 88 ° C. or higher, most preferably 89 ° C. or higher, and preferably 88 ° C. to 95 ° C., It is more preferable that it is 89 degreeC - 95 degreeC. The rubber-modified asphalt according to an embodiment of the present invention may exhibit excellent stability with a softening point of 86°C or higher, preferably 88°C or higher, and 89°C or higher.

Hereinafter, the present invention will be described in detail through Examples and Experimental Examples.

However, the following examples and experimental examples are only for illustrating the present invention, and the content of the present invention is not limited by the following examples and experimental examples.

<Production Example 1> Preparation of fine waste tire powder

Waste tire powder was pulverized by a room temperature grinding process (three-step process (step 1: crush, step 2: grinding, step 3: fine powdering)) to prepare waste tire powder having an average particle size of 80 mesh. The physical properties of the prepared waste tire powder are shown in Table 1 below.

waste tire powder Density (g/cm ³ ) 0.37 Crosslinking density (mol/cm ³ ) 3.125E-03 sol content(%) 1.35%

< Example 1> rubber modification Production of Asphalt-1

Add 455 g of asphalt to a metal can. The metal can was heated to a temperature of 185° C. to form asphalt in a liquid (gum) state. The asphalt was mixed by stirring at a rotation speed of 500 rpm.

70 g of vegetable oil was added to the asphalt in the gum state, and the stirring speed was increased to 1000 rpm and mixed. Then, the stirring speed of 3000 ~ 3500 rpm was increased and mixed.

To the mixture, 105 g of a styrene-butadiene copolymer (SBS) was added and mixed.

To the mixture, 21 g of the waste tire powder prepared in Preparation Example 1 was slowly added over 5 minutes and mixed.

The mixture was stirred for 60 minutes to mix to a complete mixture.

Finally, 28 g of a tackifying resin was mixed with the mixture, and 21 g of waste tire powder was slowly added over 5 minutes and stirred for 40 minutes to prepare rubber-modified asphalt.

< Example 2> rubber modification Production of Asphalt-2

A rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 63 g of vegetable oil, 105 g of SBS, 35 g of tackifying resin, and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< Example 3> rubber modification Production of Asphalt-3

A rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 56 g of vegetable oil, 105 g of SBS, 42 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< Example 4> rubber modification Production of Asphalt-4

A rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 77 g of vegetable oil, 98 g of SBS, 28 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< Example 5> rubber modification Production of Asphalt-5

Rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 63 g of vegetable oil, 98 g of SBS, 42 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< Example 6> rubber modification Production of Asphalt-6

A rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 56 g of vegetable oil, 91 g of SBS, 56 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< comparative example 1> rubber modification Production of Asphalt-7

Rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 77 g of vegetable oil, 105 g of SBS, 21 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< comparative example 2> rubber modification Production of Asphalt-8

A rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 70 g of vegetable oil, 98 g of SBS, 35 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< comparative example 3> rubber modification Production of Asphalt-9

Rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 74 g of vegetable oil, 98 g of SBS, 21 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< comparative example 4> rubber modification Manufacturing of Asphalt-10

A rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 77 g of vegetable oil, 91 g of SBS, 35 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< comparative example 5> rubber modification Preparation of Asphalt-11

Rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 70 g of vegetable oil, 91 g of SBS, 42 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

< comparative example 6> rubber modification Manufacturing of Asphalt-12

A rubber-modified asphalt was prepared in the same manner as in Example 1, except that 455 g of asphalt, 63 g of vegetable oil, 91 g of SBS, 49 g of tackifying resin and 42 g of waste tire powder were used to prepare rubber-modified asphalt. was prepared.

The formulation tables of the rubber-modified asphalt prepared in Examples 1 to 6 and Comparative Examples 1 to 6 are shown in Table 2 below.

asphalt
(g) SBS
(g) vegetable
oil (g) Tackifying resin (g) Waste tire powder (g) Example 1 455 105 70 28 42 Example 2 455 105 63 35 42 Example 3 455 105 56 42 42 Example 4 455 98 77 28 42 Example 5 455 98 63 42 42 Example 6 455 91 56 56 42 Comparative Example 1 455 105 77 21 42 Comparative Example 2 455 98 70 35 42 Comparative Example 3 455 98 84 21 42 Comparative Example 4 455 91 77 35 42 Comparative Example 5 455 91 70 42 42 Comparative Example 6 455 91 63 49 42

< Experimental example 1> Softening point analysis

The softening points of the rubber-modified asphalts prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were checked, and the results are shown in FIGS. 1 to 3 .

As shown in FIG. 1 , it was confirmed that the softening point of Comparative Example 1 in which an excessive amount of vegetable oil was added was as low as 85° C., while the rubber-modified asphalt of Examples 1 to 3 had a high softening point of 87° C. or higher. In particular, it was confirmed that the rubber-modified asphalt of Examples 2 and 3 had an excellent softening point of 89°C.

As shown in FIG. 2 , it could be confirmed that the softening point changed according to the ratio of SBS, vegetable oil and adhesive resin, and in the case of Examples 4 and 5, it was confirmed that the softening points were 86°C and 87°C, respectively. .

As shown in FIG. 3 , in the case of Example 6, it was confirmed that the softening point was 88°C.

< Experimental example 2> rubber modification Characterization of Asphalt

The properties of the rubber-modified asphalt prepared in Examples 2 and 3 were analyzed through the ASTM-D6690 method using a cone penetration tester, and the results are shown in Table 3 below.

Test Items unit Test result note Example 2 cone penetration
(25℃, 150g, 5s) 1/10 mm 55.1 Temperature: (24±5)℃
Humidity: (46±10)% RH elastic recovery rate
(25℃, 75g) % 87.2 Temperature: (24±5)℃
Humidity: (46±10)% RH flow chart
(60℃, 5h) mm 1.81 Temperature: (24±5)℃
Humidity: (46±10)% RH Shinto
(25℃, 5cm/min) cm 56 Temperature: (24±5)℃
Humidity: (46±10)% RH Example 3 cone penetration
(25℃, 150g, 5s) 1/10 mm 46.7 Temperature: (24±5)℃
Humidity: (46±10)% RH elastic recovery rate
(25℃, 75g) % 76.8 Temperature: (24±5)℃
Humidity: (46±10)% RH flow chart
(60℃, 5h) mm 1.72 Temperature: (24±5)℃
Humidity: (46±10)% RH Shinto
(25℃, 5cm/min) cm 58 Temperature: (24±5)℃
Humidity: (46±10)% RH

As shown in Table 3, it was confirmed that the rubber-modified asphalt of Examples 2 and 3 exhibited excellent properties in cone penetration, elastic recovery rate, flow rate, and elongation. In particular, it can be seen that the rubber-modified asphalt of Example 2 has a higher degree of cone penetration than the rubber-modified asphalt of Example 3, because the waste tire powder absorbs more oil, and it was confirmed that the penetration and flow rate were improved. The sol/sol-gel structure of asphalt was changed to a sol-gel/gel structure. As a result, it was confirmed that the temperature sensitivity was decreased and the stability to temperature and the elastic recovery rate were increased. The elastic recovery rate indicates the durability of asphalt against external impact and stress, meaning that when the elastic recovery rate increases, the fatigue resistance of asphalt becomes stronger. In terms of elongation, there was a slight increase with the increase of the tackifying resin, but there was no significant difference.

Claims (13)

100 parts by weight of asphalt; 8 parts by weight to 10 parts by weight of waste tire powder; Styrene-butadiene block copolymer (SBS) 23 parts by weight to 24 parts by weight; 12 parts by weight to 14 parts by weight of vegetable oil; and 7 parts by weight to 13 parts by weight of the tackifying resin;
The mixing ratio of the styrene-butadiene block copolymer, vegetable oil and tackifying resin is 1: 0.5-0.6: rubber-modified asphalt having a weight ratio of 0.3-0.4.
delete delete delete According to claim 1,
The rubber-modified asphalt has a softening point of 89°C to 95°C.
According to claim 1,
The waste tire powder is rubber-modified asphalt having an average particle size of 50 mesh to 100 mesh.
heating 100 parts by weight of asphalt to form a gum state;
Forming a mixture by mixing 12 parts by weight to 14 parts by weight of vegetable oil while stirring the asphalt in a gum state;
mixing 23 parts by weight to 24 parts by weight of a styrene-butadiene copolymer (SBS) in the mixture, and mixing an amount corresponding to 1/2 of 8 parts by weight to 10 parts by weight of waste tire powder; and
Including; mixing 7 parts by weight to 13 parts by weight of the tackifying resin in the mixture, and mixing waste tire powder corresponding to the remaining 1/2;
The mixing ratio of the styrene-butadiene block copolymer, vegetable oil and tackifying resin is 1: 0.5-0.6: A method of producing a rubber-modified asphalt in a weight ratio of 0.3-0.4.
8. The method of claim 7,
Forming a mixture by mixing the asphalt and vegetable oil in a gum state is a method for producing rubber-modified asphalt in which the mixture is stirred at a rotation speed of 1000 rpm to 4000 rpm at a temperature of 180°C to 200°C.
8. The method of claim 7,
The waste tire powder is pulverized by a grinding process at room temperature to produce a rubber-modified asphalt having an average particle size of 50 mesh to 100 mesh.
delete delete delete 8. The method of claim 7,
The rubber-modified asphalt has a softening point of 89 ℃ to 95 ℃ manufacturing method of the rubber-modified asphalt.

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