KR20200065260A - eco-friendly recycled asphalt additives having high handling property and asphaltic paving material that contains same - Google Patents

Abstract

The present invention relates to an eco-friendly recycling additive with improved handling properties and an asphalt pavement material containing the same. The present invention is to provide the eco-friendly recycling additive which adds a wax obtained by thermally decomposing high-density polyethylene in an aromatic oil-based recycled additive, a styrene-butadiene-styrene block copolymer-based viscosity stabilizer, and a liquid phosphorus aging improver, thereby having excellent temperature sensitivity and improved handling properties.

Description

Eco-friendly recycled asphalt additives having high handling property and asphaltic paving material that contains same}

The present invention relates to an environmentally friendly recycled additive with improved handling properties and an asphalt pavement comprising the same.

As for the production of asphalt, aging progresses while the components continuously change due to exposure to the external environment such as heat, air, ultraviolet rays, and water during the heating temperature and common period. The biggest cause affecting the aging of asphalt after public use is the rapid decrease in aromatics and increase in asphaltenes due to the increase in resin. The increase in asphaltene can be said to be the ultimate cause of hardening of asphalt and loss of adhesion.

Conventionally, the regeneration additive technology suppressed aging through a method of adding aromatics that decreases with aging, and materials mainly composed of aromatic oils, etc., which have been reduced to asphaltenes by using aromatics, have been used.

However, when a material containing the aromatic oil as the main component is used, the viscosity of the regenerating additive increases at low temperature, making it difficult to handle, and the material contains many polycyclic aromatic hydrocarbons (PAHs). There were potential problems with sheep included that could have a fatal effect on the environment and the human body.

In particular, when looking at the current circulation heating asphalt mixture quality standards (GR F 4005), the viscosity criterion of 60°C is 50 cps or more. If this standard is met, the viscosity actually rises rapidly to 500 cps or higher at 25°C, which is the normal temperature, resulting in difficulties in transportation and maintenance.

On the other hand, attempts have been made to mix and use low-flow liquid components to solve the above-mentioned handling difficulties, but the quality standards of the circulating heating asphalt mixture have not been satisfied.

Korean Registered Patent No. 10-1732098 relates to an asphalt modifier containing modified sulfur, a reaction product of sulfur and a polyolefin having a double bond as a side chain, the method for preparing the asphalt modifier, a method for preparing the asphalt concrete composition comprising the same, and a composition thereof As a thing, a composition for modifying asphalt, including wax, is provided, but a composition for an asphalt regeneration additive that can facilitate handling with good fluidity at room temperature while satisfying the quality standards of a circulating heated asphalt mixture is not provided. .

Korean Registered Patent No. 10-1732098

It is an object of the present invention to provide a recycled additive having a low viscosity so as to be easily handled at room temperature while satisfying a 60°C viscosity standard, which is a circulating heated asphalt mixture quality standard (GR F 4005). In addition, it is intended to provide a sustainable and eco-friendly recycled additive with low PHAs content.

The object of the present invention is not limited to the object mentioned above. The object of the present invention will be more apparent from the following description, and will be realized by means described in the claims and combinations thereof.

According to the present invention, a regenerating additive comprising an aromatic oil, a fluidizing agent and an aliphatic saturated hydrocarbon-based oil; And a wax obtained by thermally decomposing polyethylene having a density of 0.93 to 0.97 g/cc; it provides an environment-friendly recycled additive with improved handling properties.

The additive may further include one selected from the group consisting of styrene-butadiene-styrene block copolymers, aging improvers, and combinations thereof.

The aromatic oil content of polycyclic aromatic hydrocarbons (polycyclic aromatic hydrocarbons, PHAs) is less than 5mg / kg, the aniline point may be 60 to 80 ℃.

The fluidizing agent may be a vegetable oil having a viscosity of 60 cps or less at 25°C.

The aliphatic saturated hydrocarbon-based oil may be a paraffinic hydrocarbon having a flash point of 230°C or higher and a pour point of -15°C or lower.

The wax may have a viscosity of 200 to 500 cps at 130°C.

The wax may have a melting point of 115 to 125°C.

The styrene-butadiene-styrene block copolymer may have a styrene content of 28 to 33% by weight, a styrene-butadiene diblock content of 20 to 60%, and a molecular weight of 80,000 to 11,000 g/mol.

The aging improver may be a liquid phosphorus aging improver.

The aging improving agent may be one selected from the group consisting of tri(nonylphenyl) phosphite, triphenyl phosphite, and combinations thereof.

The regenerating additive may include 25 to 50% by weight of an aromatic oil, 20 to 50% by weight of a fluidizing agent, and 15 to 30% by weight of an aliphatic saturated hydrocarbon-based oil.

The wax may include 0.3 to 1.5 parts by weight based on 100 parts by weight of the mixture.

The styrene-butadiene-styrene may include 0.5 to 2 parts by weight based on 100 parts by weight of the mixture.

The aging improving agent may include 2 to 10 parts by weight based on 100 parts by weight of the mixture.

According to the present invention, it is possible to provide an asphalt pavement material characterized in that an eco-friendly recycled additive having improved handling properties is added to any one selected from the group consisting of new aggregates, asphalt pavement waste materials, and combinations thereof.

The regenerative additive according to the present invention provides an effect of easy handling because it does not have a high viscosity at room temperature while satisfying the circulating heating asphalt mixture quality standards.

The regenerative additive according to the present invention provides the effect of having the highest grade in the quality criteria of the circulating heated asphalt mixture.

The regenerative additive according to the present invention provides the effect of being sustainable and eco-friendly due to low PHAs content.

The effects of the present invention are not limited to the effects mentioned above. It should be understood that the effects of the present invention include all effects that can be deduced from the following description.

The above objects, other objects, features and advantages of the present invention will be readily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed contents are thorough and complete and that the spirit of the present invention is sufficiently conveyed to those skilled in the art.

In describing each drawing, similar reference numerals are used for similar components. In the accompanying drawings, the dimensions of the structures are shown to be enlarged than the actual for clarity of the present invention. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this specification, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, actions, components, parts or combinations thereof are not excluded in advance. In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case of being "directly above" the other part but also another part in the middle. Conversely, when a portion of a layer, film, region, plate, or the like is said to be “under” another portion, this includes not only the case “underneath” another portion, but also another portion in the middle.

Unless otherwise specified, all numbers, values, and/or expressions expressing the amounts of ingredients, reaction conditions, polymer compositions, and blends used herein are those numbers that occur in obtaining these values, among others. As these are approximations that reflect the various uncertainties of the measurement, it should be understood that in all cases they are modified by the term "about". In addition, when numerical ranges are disclosed in this description, these ranges are continuous, and include all values from the minimum value in this range to the maximum value including the maximum value, unless otherwise indicated. Further, when such a range refers to an integer, all integers including the minimum value to the maximum value including the maximum value are included unless otherwise indicated.

In the present specification, when a range is described for a variable, it will be understood that the variable includes all values within the described range including the described endpoints of the range. For example, a range of “5 to 10” includes values of 5, 6, 7, 8, 9, and 10, as well as any subrange of 6 to 10, 7 to 10, 6 to 9, 7 to 9, and the like. It will be understood to include, and include any value between integers pertinent to the stated range of ranges such as 5.5, 6.5, 7.5, 5.5 to 8.5 and 6.5 to 9, and the like. Also, for example, the range of “10% to 30%” is 10% to 15%, 12% to 10%, 11%, 12%, 13%, etc., and all integers including up to 30%. It will be understood that it includes any subranges such as 18%, 20% to 30%, etc., and also includes any value between valid integers within the scope of the stated range, such as 10.5%, 15.5%, 25.5%, and the like.

The present invention is an environmentally friendly recycled additive with improved handling properties, comprising: an aromatic oil, a fluidizing agent and an aliphatic saturated hydrocarbon-based oil; And wax obtained by thermally decomposing polyethylene having a density of 0.93 to 0.97 g/cc. In addition, a feature selected from the group consisting of styrene-butadiene-styrene block copolymers, aging improvers, and combinations thereof may be additionally added to the regenerated additive.

The wax is a viscosity stabilizer, and serves to form a network of fine crystal structures in a regenerated additive. The styrene-butadiene-styrene block copolymer serves to stabilize the network formed by the viscosity stabilizer as a viscosity improver.

The aromatic oil may be prepared through a vacuum distillation process of crude oil through two or more extraction and purification processes, and the content of polycyclic aromatic hydrocarbons (PHAs) is less than 5 mg/kg, and the aniline point is 60 to 80°C. to be. At this time, if the extraction and purification process is not performed twice or more, it is difficult to lower the content of PHAs at the source.

The aromatic oil is contained 25 to 50% by weight based on the mixture. At this time, if it is less than 25% by weight, the compatibility with the viscosity improving agent is deteriorated, and if it exceeds 50% by weight, the viscosity is high and the fluidity at low temperature is deteriorated.

The fluidizing agent is a vegetable oil whose main component is a fatty acid ester system, and the fatty acid ester system combines with asphaltenes of asphalt to provide flexibility to enhance the regeneration effect of aged asphalt.

The fluidizing agent is characterized by having a viscosity of 60 cps or less at 25°C. The fluidizing agent may be one selected from the group consisting of castor oil, cottonseed oil, amines, canola oil, soybean oil and combinations thereof.

The vegetable oil, which is the fluidizing agent, is preferably used after removing the solids after leaving the spent oil for more than 48 hours. Waste oil, which has been used, has a high viscosity and is effective in improving viscosity at 60°C.

The fluidizing agent is contained 20 to 50% by weight based on the mixture. At this time, if it is less than 20% by weight, the regeneration effect of aged asphalt is reduced, and if it is 50% by weight, the viscosity of the reclaimed additive at 60° C. is low.

The aliphatic saturated hydrocarbon-based oil is a paraffinic hydrocarbon having a flash point of 230°C or higher and a pour point of -15°C or lower. The aliphatic saturated hydrocarbon-based oil serves to improve low temperature fluidity.

The aliphatic saturated hydrocarbon-based oil is 15 to 30% by weight based on the mixture. At this time, if it is less than 15% by weight, the effect of improving low-temperature fluidity is not large, and if it is more than 30% by weight, it is miscible with asphalt and may affect physical properties, and it is impossible to satisfy the saturate standard among GR F 4005 standards.

The wax used as the viscosity stabilizer is a wax obtained by thermally decomposing polyethylene having a density of 0.93 to 0.97 g/cc, and plays a role in preventing the difference in viscosity between low and high temperatures by forming a network of fine crystal structures in the regenerant additive. At this time, when it is out of the density range of the polyethylene, it is impossible to obtain a wax having a desired melting point and viscosity.

The viscosity stabilizer has a melting point of 115 to 125°C, and a viscosity of 200 to 500 cps at 130°C. At this time, if the melting point is less than 115°C, the crystallinity is low, and the effect is minimal. In addition, if the viscosity is less than 200 cps, the molecular weight is too low to form a desired network, and if it exceeds 500 cps, the molecular weight is too large to aggregate with each other so that a network is not formed.

The viscosity stabilizer is included in an amount of 0.3 to 1.5 parts by weight based on 100 parts by weight of the mixture. At this time, if it is less than 0.3 parts by weight, the concentration may be low, and network formation may be difficult. If it is more than 1.5 parts by weight, the concentration may be high, and the wax particles may clump together and aggregate, and there is a concern that the regenerant additive becomes a gel at room temperature.

The styrene-butadiene-styrene block copolymer used as the viscosity improving agent serves to stabilize the network formation of the viscosity stabilizer and the effect of improving the viscosity of the regenerant additive. Specifically, the viscosity improving agent has a styrene content of 28 to 33% by weight, a styrene-butadiene diblock content of 20 to 60%, and a molecular weight of 80,000 to 11,000 g/mol. At this time, if the diblock content is less than 20%, a gel may be formed, and if it exceeds 60%, the viscosity is lowered so that the effect of improving the viscosity is not large. In addition, if the molecular weight is less than 80,000 g/mol, the viscosity is low, so the effect of improving the viscosity is not large. If it is more than 11,000 g/mol, the compatibility is poor, which may cause precipitation or form a gel. There can be difficulties.

The viscosity improving agent is included in 0.5 to 2 parts by weight based on 100 parts by weight of the mixture. At this time, if it is less than 0.5 part by weight, the effect of improving the viscosity will not be large, and if it is more than 2 parts by weight, the viscosity will be too high, and low-temperature fluidity may deteriorate.

The aging improving agent serves to improve the long-term durability of the asphalt binder. The aging improving agent should be free from phase separation when mixed with a regenerating additive, preferably a phosphite-based phosphorus aging improving agent that is liquid at room temperature. Typically, it may be one selected from the group consisting of tri(nonylphenyl)phosphite, triphenyl phosphite, and combinations thereof.

The aging-improving agent contains 2 parts by weight to 10 parts by weight based on 100 parts by weight of the mixture. It is preferably 3 parts by weight to 10 parts by weight. At this time, if it is out of the above range, there is a problem in storage and dispersibility due to phase separation in the regenerated additive, so that the effect of improving long-term durability is not large.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples for helping the understanding of the present invention, and the scope of the present invention is not limited thereto.

Ingredient preparation

Aromatic oil: PHAs ?3mg/kg and oil with aniline point 70℃ after two extraction and purification processes

Fluidizing agent A: Soybean oil with solid content removed from the used soybean oil after precipitation.

Fluidizing agent B: Soybean oil that has never been used

Aliphatic oil: Paraffinic aliphatic saturated hydrocarbon oil with pour point of -16℃ and flash point of 250℃

Viscosity stabilizer A: High density polyethylene (HDPE) wax with a melting point of 118°C and a viscosity of 350 cps at 140°C.

Viscosity stabilizer B: Low density polyethylene (LDPE) wax with a melting point of 102°C and a viscosity of 350 cps at 140°C.

Viscosity stabilizer C: polypropylene wax with a melting point of 153°C and a viscosity of 350 cps at 170°C.

Viscosity improving agent A: Styrene-butadiene-styrene block copolymer having a styrene content of 30% by weight, a diblock content of 50%, and a molecular weight of 10,000 g/mol.

Viscosity improving agent B: Styrene-butadiene-styrene block copolymer having a styrene content of 30% by weight, a diblock content of 10%, and a molecular weight of 10,000 g/mol.

Aging improver: triphenyl phosphite (TNPP)

Assessment Methods

<Evaluation of viscosity stability according to temperature>

60℃ Viscosity: If the viscosity of 60℃ is 50 cps or more using a rotary viscometer, it is passed, and if it is 50 cps or less, it is rejected.

Room temperature (25℃) Viscosity: If there is no flow when the 20℃ viscosity is over 500cps or tilted at 90° for 1 minute using a rotary viscometer, it is rejected.

Low-temperature flowability: After standing for 4 hours at 5°C in a 100 ml vial and tilting 90° for 1 minute, there is a flow, and if there is no flow, it is judged as rejected.

<Renewable additive effect>

After mixing the old asphalt and the new asphalt at 6:4, an asphalt binder was prepared, and a recycled additive was added thereto to perform a performance grade (PG) evaluation.

If it shows a PG64-22 value similar to that of new asphalt, it is passed, otherwise it is rejected. In addition, for relative comparison, the penetration value was measured at 25°C. If the same regeneration additive is used, the higher the penetration value, the better the regeneration effect is evaluated.

<PHAs evaluation>

Analyzing PHAs content of 18 kinds by analyzing to SGS

<Mixture evaluation>

30% of recycled aggregate and 70% of new aggregate are used, and the optimum regeneration additive content is determined according to KSM2247 "Asphalt absolute viscosity test method", the formulation is designed accordingly, and the mixture is prepared at 150℃ to evaluate the mixture performance by marshall test.

<GR F 4005 evaluation criteria>

Regenerative additives according to GR F 4005 (quality standards for circulating heated asphalt mixtures)

Manufacturing example

Mixtures of TEST1 to TEST6 were prepared according to the component ratios shown in Table 1 below.

TEST1 TEST2 TEST3 TEST4 TEST5 TEST6 Aromatic oil 100 70 55 35 35 35 Fluidizing agent A - 15 30 55 45 - Fluidizing agent B - - - - - 45 Aliphatic oil - 15 15 10 20 20 Sum(%) 100 100 100 100 100 100

Example

Aromatic oil, fluidizing agent and aliphatic oil are mixed and heated to 140°C based on the composition content ratio of Table 2 below to prepare a regenerated additive, and a viscosity stabilizer, a viscosity improver and an aging improver based on 100 parts by weight of the regenerated additive. The mixture was stirred for 2 hours at 300 rpm, and cooled to prepare regenerated additives of Examples 1 to 3 and Comparative Examples 1 to 11.

room
city
Yes
One room
city
Yes
2 room
city
Yes
3 ratio
School
Yes
One ratio
School
Yes
2 ratio
School
Yes
3 ratio
School
Yes
4 ratio
School
Yes
5 ratio
School
Yes
6 ratio
School
Yes
7 ratio
School
Yes
8 ratio
School
Yes
9 ratio
School
Yes
10 Aromatic
oil
(wt%) 35 35 35 35 35 35 35 35 35 35 35 35 35 Fluidizing agent A
(wt%) 45 45 45 45 45 45 45 45 45 45 - 55 45 Fluidizing agent B
(wt%) - - - - - - - - - 45 - - Aliphatic oil
(wt%) 20 20 20 20 20 20 20 20 20 20 20 10 20 Sum 100 100 100 100 100 100 100 100 100 100 100 100 100 Viscosity stabilizer A
(phr) 0.5 0.5 0.5 0.5 - 0.5 2.0 - 0.5 0.5 0.5 0.5 Viscosity stabilizer B
(phr) - - - - - - - 0.5 - - - - - Viscosity stabilizer C(phr) - - - - - - - - 0.5 - - - - Viscosity improving agent A(phr) One 1.5 One - One 3.0 One One One - One One One Viscosity improving agent B(phr) - - - - - - One - - - TNPP(phr) - - 9 - - - - - - - - - 15

Experimental Example 1

(Evaluation of fluidity according to content and type of regenerated additive)

The composition of TEST1 to TEST6 of the above preparation example was evaluated for viscosity stability according to temperature at 60°C, room temperature and low temperature, as shown in Table 3 below, to select the optimum ratio of the regeneration additive.

TEST1 TEST2 TEST3 TEST4 TEST5 TEST6 60℃ viscosity (cps) 140 90 75 33 32 24 Room temperature viscosity (cps) 1,800 1,200 900 350 330 280 Low temperature flowability fail fail fail pass pass pass

As a result of evaluating the viscosity stability according to the above temperature, in the case of TEST1 to TEST3 having a high content of aromatic oil, the viscosity at 60°C is more than 50 cps, which satisfies the temperature specification of GR F 4005, but the viscosity is high at room temperature and there is no flow at low temperature. It is expected that there will be difficulties.

It can be seen that the TEST4 to TEST6 have flowability at a low temperature, and the viscosity is stably low at room temperature.

When comparing the results of TEST4 and TEST5, the difference in the ratio of the viscosity increase compared to TEST5 at room temperature is larger than the ratio of TEST4 having a high content of fluidizing agent A compared to TEST5 at 60°C, and as a result, TEST5 is higher than TEST4 It can be expected that the mixture shows more efficient results.

When comparing the TEST5 and TEST6, it can be confirmed that the viscosity of TEST5 using the fluidizing agent A was slightly higher than TEST6 using the fluidizing agent B.

Experimental Example 2

(Viscosity characteristics evaluation of recycled additives according to the content of viscosity stabilizer A and viscosity improver A)

The viscosity and flowability at 60°C, room temperature and low temperature of the regenerated additives of Examples 1 to 2 and Comparative Examples 1 to 4 were evaluated and are shown in Table 4 below.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Aromatic
oil
(wt%) 35 35 35 35 35 35 Fluidizing agent A
(wt%) 45 45 45 45 45 45 Aliphatic oil
(wt%) 20 20 20 20 20 20 Sum 100 100 100 100 100 100 Viscosity stabilizer A
(phr) 0.5 0.5 0.5 - 0.5 2.0 Viscosity improving agent A
(phr) One 1.5 - One 3.0 One 60℃ viscosity
(cps) 53 57 35 37 75 65 25℃ viscosity
(cps) 383 470 360 380 Gelation 860 5℃ Flowability pass pass pass pass fail fail

Looking at the results of Table 4, when only the viscosity stabilizer or only the viscosity improver was used separately, the viscosity specification (above 50 cps) of the 60°C was not satisfied, and when the viscosity stabilizer and the viscosity improver were outside the content range, the viscosity was at room temperature and low temperature. Was formed too high or became fluid. Based on this, it can be seen that in the case of the viscosity stabilizer, the wax is finely dispersed in the regenerant additive to form a network and increase the viscosity, but when the content increases, the slurry phenomenon occurs and the viscosity increases rapidly at room temperature and low temperature. In addition, the viscosity improving agent satisfies the viscosity standard of 60 ℃, it can be seen that the viscosity increases rapidly at room temperature and low temperature.

On the other hand, Examples 1 and 2 show excellent viscosity characteristics at all temperatures, and it can be confirmed that the flowability was good at low temperatures. It can be seen that Example 2, which increased the content of the viscosity improving agent more than Example 1, forms a slightly higher viscosity than Example 1 at 60°C and 25°C.

Experimental Example 3

(Evaluation of viscosity characteristics of regenerated additives according to the type of fluidizing agent, viscosity stabilizer and viscosity improving agent)

The viscosity and flowability at 60° C., room temperature and low temperature for the regenerated additives of Examples 1 and Comparative Examples 5 to 8 were evaluated and are shown in Table 5 below.

Example 1 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Aromatic
oil
(wt%) 35 35 35 35 35 Fluidizing agent A
(wt%) 45 45 45 45 - Fluidizing agent B
(wt%) - - - - 45 Aliphatic oil
(wt%) 20 20 20 20 20 Sum 100 100 100 100 100 Viscosity stabilizer A
(phr) 0.5 - - 0.5 0.5 Viscosity stabilizer B
(phr) - 0.5 - - - Viscosity stabilizer C
(phr) - - 0.5 - - Viscosity improving agent A
(phr) One One One - One Viscosity improving agent B
(phr) - - - One - 60℃ viscosity
(cps) 53 37 35 54 48 25℃ viscosity
(cps) 383 382 388 420 370 5℃ Flowability pass pass pass pass pass

Looking at the results of Table 5, it can be seen that when using the PE wax of a specific structure through Example 1, Comparative Example 5 and Comparative Example 6, there was an effect of improving the viscosity. Comparing Example 1 and Comparative Example 8, when the waste oil was not used, the viscosity specification of 60°C was not satisfied. Comparing Example 1 and Comparative Example 7, it can be seen that the use of a viscosity improving agent having many diblocks is advantageous in securing fluidity at room temperature and low temperature.

Experimental Example 4

(Binder PG evaluation)

With the recycled additive of Example 1, it was confirmed whether the effect of the recycled additive was obtained through a binder PG evaluation.

The old asphalt and the new asphalt were mixed at 6:4 and 7:3 as shown in Table 6, and then the asphalt binder was prepared, and then the regenerated additive of Example 1 was added at 2 or 3 phr to evaluate PG.

Old asphalt
(wt%) 40 40 40 30 30 30 - New asphalt
(wt%) 60 60 60 70 70 70 100 Sum 100 100 100 100 100 100 100 Regeneration additive of Example 1 - 2 3 - 2 3 - DSR before RTFO
G*/sinδ
(70℃, kPa) 2.6 1.7 1.4 2.3 1.5 1.2 1.1 DSR after RTFO
G*/sinδ
(64℃, kPa) 3.9 2.7 2.5 3.5 2.6 2.3 2.4 M-value after PAV (-18℃) 0.23 0.30 0.31 0.25 0.32 0.33 0.34 PG rating PG 70-18 PG 64-22 PG 64-22 PG 70-18 PG 64-22 PG 64-22 PG 64-22

Looking at the results of Table 6, when mixing old asphalt and new asphalt, PG was 70-18. When the regeneration additive of the present invention was mixed in 2 to 3 phr, it can be confirmed that the same properties as those of new asphalt. Through this, it can be seen that the regenerative additive of the present invention is effective as a regenerative additive.

Experimental Example 5

(Long-term durability evaluation)

To improve long-term durability, a liquid phosphorus-based aging improver can be used. To confirm this, the change in penetration after going through an asphalt short-term aging (RTFO) process was examined.

At this time, after mixing the old asphalt and the new asphalt at a ratio of 3:7, the recycled additives of Examples 1, 3, and 10 were added 3 phr, respectively, and the change in penetration was examined. If aging is less, the change in invasion rate after short-term aging becomes small.

Example 1 Example 3 Comparative Example 10 Reference Old asphalt
(wt%) 30 30 30 - New asphalt
(wt%) 70 70 70 100 Sum 100 100 100 100 Intrusion before RTFO
(dm) 67 66 68 68 Intrusion degree after RTFO
(dm) 49 54 48 50 Rate of change (%) 26.9 18.2 29.4 26.5

When comparing the results of Example 1, Example 3, and Comparative Example 10 in the results of Table 7 with reference (100% of new asphalt), the change in the penetration value after short-term aging is not large as the liquid phosphorus-based aging improver enters. It can be seen that short-term aging is less. In the case of Comparative Example 10, phase separation and the like occurred, and thus the effect of improving aging was not large due to dispersibility. Through this, it can be seen that the aging performance of the asphalt is improved.

Experimental Example 6

(18 PHAs analysis and evaluation)

18 types of PHAs were analyzed for the conventional regenerant additives in general commercialization with the regenerant additives of Example 1, and the results are shown in Tables 8 and 9. This is the result obtained by requesting a Korean SGS analysis agency. (The results in Table 8 are the results for 0.139 mg/kg (ppM) of regenerated additive in Example 1, and Table 9 is the results for 63 mg/kg (ppm) of conventional regenerated additive.)

Comparing the results of Table 8 and Table 9, it can be confirmed that there are almost no PHAs of the regenerant additive of the present invention. As a result, it can be confirmed that the regeneration additive of the present invention is a sustainable and eco-friendly regeneration additive.

Experimental Example 7

(GR F 4005 quality evaluation)

The recycled additives of Example 1, Example 3 and Comparative Example 11 were evaluated to see if the recycled additive of the present invention satisfies the recycled additive criteria listed in GR F 4005 (Circulation Heating Asphalt Mixture Quality Criteria).

Example 1 Example 3 Comparative Example 11 Reference (Standard RA-1) Aromatic
oil
(wt%) 35 35 35 Fluidizing agent A (wt%) 45 45 30 Aliphatic oil
(wt%) 20 20 35 Sum 100 100 100 Viscosity stabilizer A
(phr) 0.5 0.5 0.5 Viscosity improving agent A
(phr) One One One TNPP(phr) - 9 - 60℃ viscosity (cps) 53 56 54 50~175 Flash point (℃) 260 240 250 218 or more Saturate (wt%) 20 17 35 30 or less Viscosity ratio after RTFO 1.1 0.8 2.0 3 or less Mass change rate after RTFO (wt%) 0.2 0.1 One 4 or less

Looking at the results of Table 10, all of Example 1 and Example 3 corresponding to the present invention satisfied the GR F 4005 criterion, but it can be seen that Comparative Example 11 does not satisfy the criterion due to its high content of saturate. This is because the aliphatic oil content in the mixture of Comparative Example 11 exceeded the scope of the present invention.

Claims (15)

Regenerating additives including aromatic oils, fluidizing agents and aliphatic saturated hydrocarbon-based oils; And
Wax obtained by thermally decomposing polyethylene having a density of 0.93 to 0.97 g/cc; an environmentally friendly regenerating additive having improved handling properties, comprising a wax.
According to claim 1,
The regenerative additive is a styrene-butadiene-styrene block copolymer, an aging improving agent and an eco-friendly regenerating additive with improved handling characteristics, further comprising one selected from the group consisting of combinations thereof.
According to claim 1,
The aromatic oil is polycyclic aromatic hydrocarbons (polycyclic aromatic hydrocarbons, PHAs) content of less than 5mg / kg, an aniline point of 60 to 80 ℃, improved environmentally friendly recycled additives with improved handling.
According to claim 1,
The fluidizing agent is an environmentally friendly regenerating additive with improved handling, characterized in that it is a vegetable oil having a viscosity of 60 cps or less at 25°C.
According to claim 1,
The aliphatic saturated hydrocarbon-based oil is an environmentally friendly recycled additive with improved handling, characterized in that it is a paraffinic hydrocarbon having a flash point of 230°C or higher and a pour point of -15°C or lower.
According to claim 1,
The wax is an eco-friendly recycled additive with improved handling properties, characterized in that the viscosity is 200 to 500 cps at 130°C.
According to claim 1,
The wax is an environmentally friendly regenerating additive with improved handling characteristics, characterized in that the melting point is 115 to 125 ℃.
According to claim 2,
The styrene-butadiene-styrene block copolymer has a styrene content of 28 to 33% by weight, a styrene-butadiene diblock content of 20 to 60%, a molecular weight of 80,000 to 11,000 g/mol, and improved handling properties. Eco-friendly recycled additive.
According to claim 2,
The aging improver is a liquid-based phosphorus aging improver, an environmentally friendly recycled additive with improved handling.
According to claim 2,
The aging improving agent is tri (nonylphenyl) phosphite (tris (nonylphenyl) phosphite), triphenyl phosphite (triphenyl phosphite) and a combination of these environmentally friendly recycling additives with improved handling, characterized in that one selected from the group consisting of .
According to claim 1,
The recycled additive is an environmentally friendly recycled additive with improved handling, characterized in that it comprises 25 to 50% by weight of an aromatic oil, 20 to 50% by weight of a fluidizing agent and 15 to 30% by weight of an aliphatic saturated hydrocarbon-based oil.
According to claim 1,
The wax is an environmentally friendly recycled additive with improved handling, characterized in that it contains 0.3 to 1.5 parts by weight based on 100 parts by weight of the recycled additive.
According to claim 2,
The styrene-butadiene-styrene is an environmentally friendly recycled additive with improved handling, characterized in that it contains 0.5 to 2 parts by weight based on 100 parts by weight of the recycled additive.
According to claim 2,
The aging improver is an environmentally friendly recycled additive with improved handling, characterized in that it contains 2 to 10 parts by weight based on 100 parts by weight of the recycled additive.
Asphalt pavement, characterized in that added to any one selected from the group consisting of new aggregates, asphalt pavement scraps and combinations thereof, wherein the eco-friendly recycled additive with improved handling properties selected from claims 1 to 14.