KR20060104966A - Modifiers for imparting high toughness and high elasticity to asphalt and asphalt compositions comprising the same - Google Patents

Abstract

The present invention relates to asphalt used for road pavement and the like, characterized in that the asphalt is mixed with polyolefin, which is a polymer that gives toughness, and an organic peroxide that can impart elasticity, asphalt modifier, and modified asphalt with improved physical properties of asphalt. A composition, and modified asphalt, and a method for producing the same.

Asphalt, Polyolefin, Toughness, Elasticity, Organic Peroxide, Modified Asphalt

Description

Modifier endowing high toughness and elasticity to asphalt, and Asphalt Composition comprising the modifier}

The present invention relates to asphalt used for road pavement and the like, and relates to a modified asphalt in which plastic deformation and cracking are prevented by mixing polyolefin and organic peroxide in asphalt.

In general, the pavement of the road is asphalt pavement or cement pavement, most of the road is paved with asphalt. The reason is that it is inexpensive, has some elasticity, and is easy to maintain surface flatness. However, the asphalt (straight asphalt) is sensitive to the ambient temperature, so brittle in the low temperature environment, such as winter, there is a problem that cracks on the pavement, and in the high temperature environment, such as summer, the surface of the pavement road Hanging causes a so-called rutting. Such cracking and repetition of plastic deformation cause a problem of rapidly shortening the life of asphalt.

In order to overcome this problem, an asphalt modification method for adding stiffness to asphalt by adding a polymer to asphalt has been actively studied. Among them, many polymers that are studied and used are rubbers such as styrene-butadiene rubber (SBR) and styrene-butadiene-styrene (SBS), and plastics such as polyethylene and ethyl acrylate. Asphalt modified with rubber-like polymers has a blast furnace elasticity having a network structure, thereby improving crack resistance at low temperatures and reducing plastic deformation at high temperatures.

However, such a rubber polymer has a very low miscibility with asphalt, and also has a problem that the asphalt modified with the rubber polymer has too high viscosity and greatly degrades workability.

Asphalt modified with plastic polymers has rigidity, so that the plastic deformation at high temperature is reduced, and the viscosity is not so high, so it is compatible with asphalt and has excellent workability. However, the asphalt modified with this plastic polymer is easy to undergo phase separation and is too hard at low temperatures and thus lacks elasticity. The reason is that it does not have a network structure.

The technical problem to be achieved by the present invention is to provide a new asphalt modifier that can impart high toughness and high elasticity to the asphalt in order to suppress plastic deformation and cracking of the asphalt.

Another technical problem to be achieved by the present invention is to provide an asphalt composition comprising the asphalt modifier that can impart high toughness and high elasticity to asphalt.

The present invention to achieve the above technical problem,

Provided are asphalt modifiers comprising polyolefins and organic peroxides.

The modified asphalt of the present invention is characterized by mixing a plastic deformation, a strong polyolefin and a network forming agent. Polyolefins do not break themselves at temperatures below zero and are very tough at room temperature. At high temperatures the melt viscosity is very low. Asphalt modified with plastic polymers is superior in terms of cost, workability and strength compared to asphalt modified with rubber polymers. However, low temperature characteristics are not very good. This is due to the lack of elasticity. In comparison, asphalt modified with rubber polymers has elasticity. This is due to the network structure of the rubber polymer. Therefore, if it is possible to modify the asphalt with plastic polymers and introduce the network structure using the network forming agent therein, it will be a shortcut to solve all the problems such as high temperature characteristics, low temperature characteristics, cost, workability and so on.

Polyolefins consisting only of carbon and hydrogen form a network when reacted with organic peroxides. The organic peroxide is intended to trap and deodorize hydrogen of the polyolefin so that the polyolefins form a network. The polyolefin network then takes the shape of confining asphalt within the various networks, thereby providing elasticity to the structure, that is, the modified asphalt, and suppressing the phenomenon of polyolefin rising upward due to the density difference at high temperature, that is, the phase separation phenomenon. .

According to one embodiment of the invention, the polyolefin comprises at least one of low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and high density polyethylene (HDPE).

According to one embodiment of the invention, the polyolefin further comprises polyacrylate, polymethacrylate and mixtures thereof.

According to one embodiment of the invention, the polyolefin further comprises ethylene vinyl acetate.

According to an embodiment of the present invention, the organic peroxide includes a dialkyl peroxide.

According to an embodiment of the present invention, the organic peroxide includes diacyl peroxide.

According to an embodiment of the present invention, the organic peroxide includes diperoxychital.

According to one embodiment of the present invention, the organic peroxide includes a peroxyester.

The present invention to achieve the above other technical problem,

It provides an asphalt composition comprising the asphalt modifier and asphalt.

According to one embodiment of the present invention, the content of the polyolefin in the composition is 0.1 to 20 parts by weight or less based on 100 parts by weight of asphalt.

According to one embodiment of the invention, the content of the polyolefin in the composition is 3 to 10 parts by weight based on 100 parts by weight of asphalt.

According to one embodiment of the invention, the content of the polyolefin in the composition is 3 to 5 parts by weight based on 100 parts by weight of asphalt.

According to one embodiment of the invention, the content of the organic peroxide in the composition is 0.1 to 10 parts by weight or less based on 100 parts by weight of asphalt.

According to one embodiment of the invention, the content of the organic peroxide in the composition is 0.1 to 5 parts by weight based on 100 parts by weight of asphalt.

According to one embodiment of the invention, the content of the organic peroxide in the composition is 0.5 to 2 parts by weight based on 100 parts by weight of asphalt.

According to one embodiment of the present invention, examples of the asphalt in the composition include Gilsonite, Glenpitch, Grahamite, Straight Asphalt, Asphalt Cement, Cutback Asphalt, Emulsified Asphalt, Blown Asphalt, Modified Asphalt, and the like.

According to one embodiment of the invention, the composition may further comprise one or more aggregates, pigments, fragrances and the like, the content of which is 0.1 to 10 parts by weight based on 100 parts by weight of asphalt.

Hereinafter, the present invention will be described in more detail.

Asphalt modifier according to the present invention comprises a small amount of polyolefin and a small amount of organic peroxide, thereby improving the physical properties of the asphalt concrete produced using the asphalt composition obtained by adding them to the asphalt, thereby plastic deformation and cracking of the paved road Preventing the formation, greatly improving the durability of the road to further extend the life of the asphalt road to reduce the direct and indirect maintenance costs, and provide a modified asphalt to maintain a more pleasant and safe road.

Polyolefins usable in the present invention include both new and remanufactured products and are not limited in their component and form. It is also possible to use them without the need for separate separation processes, whether they are single or mixtures.

Organic peroxides usable in the present invention are readily available on the market and as dialkyl peroxides, dicumyl peroxide, dibutyl peroxydimethylhexine, and diacyl peroxides are known as lauroyl peroxide and decanoyl. Diamylperoxycyclohexane and dibutyl peroxy trimethylcyclohexane are peroxides and diperoxychitals, and butylperbezoate and amyl perocate are most easily handled as peroxyesters.

The modified asphalt mixed in this way is endowed with low melt viscosity and ductility of polyolefin, which improves workability, and is resistant to cracking at low temperatures. It can be maintained to ensure excellent road flatness.

Asphalt composition according to the invention comprises an asphalt modifier and asphalt containing the polyolefin and the organic peroxide.

According to one embodiment of the present invention, the content of the asphalt modifier in the composition is 0.1 to 20 parts by weight, 0.1 to 10 parts by weight or less, preferably 3 to 10, respectively, of polyolefin and organic peroxide, based on 100 parts by weight of asphalt. It is weight part, 0.1-5 weight part, More preferably, they are 3-5 weight part and 0.5-2 weight part, respectively. When the content of the polyolefin and the organic peroxide exceeds 20 parts by weight and 10 parts by weight, respectively, the viscosity of the composition is excessively high, which may lower the workability and increase the manufacturing cost, which is not preferable.

As the asphalt used in the asphalt composition of the present invention, any one used in the art can be used without limitation, but it is generally used in asphalt, and it is generally used for asphalt, and oil is impregnated with asphalt for many years due to petroleum infiltration such as cracks and impurities. This is the generic name of this almost pure asphalt, gilsonite, glenpi pitch, grahamite and the like, and the products obtained in the process of refining petroleum products such as petroleum refining, such as straight asphalt, asphalt cement, cutback asphalt, emulsified asphalt, Blown asphalt, modified asphalt, and the like, and these may be used without limitation.

Asphalt composition according to the present invention may further include one or more additives such as aggregates, pigments (inorganic pigments or organic pigments) and flavorings. Their content is preferably used 0.1 to 10 parts by weight based on 100 parts by weight of the asphalt. If their content exceeds 10 parts by weight, the properties of the asphalt itself may be impaired. If the content is less than 0.1 part by weight, the improvement effect on the asphalt is insignificant, which is not preferable.

The aggregates used in the present invention may improve the drainage and / or strength of the asphalt composition, and such improvement of physical properties can be controlled by appropriately adopting the particle size of the aggregates, and using a method known in the art. Can be. Such aggregates can also use recycled aggregates, and recycled aggregates can be used at a rate of 0 to 100% by weight of the total aggregates.

Particularly, in case of emphasizing drainage in asphalt composition, the viscosity should be high so as to increase the film thickness at the time of laying and to be favorable for weather resistance and resistance to plastic deformation. Such a viscosity improvement can be achieved through the addition of the modifier of the present invention as described above. It also has the advantage of being able to achieve it.

Pigments and fragrances used in the asphalt composition according to the present invention are used to give color and direction to the asphalt. Pigments may also be added to serve as fillers, either inorganic or organic pigments may be used. Examples of usable materials include talc, clay, titanium dioxide, iron oxide, and the like, and any of those known in the art can be used without any limitation. By using such a pigment to give a color to the final asphalt, it can be particularly useful for lane markings such as bus lanes. The fragrance can remove the disgusting smell of asphalt, and can implement a fragrant road having different directions for each road. Any inorganic or organic flavor can be used for this. Usable include rosemary, mint, phytoncide, avender and the like, in addition to these, those known in the art can be used without any limitation.

In the method of producing an asphalt composition according to the present invention, the premix method using the modified asphalt made by mixing the asphalt modifier according to the present invention to the asphalt when mixing the aggregates and asphalt, and when mixing the aggregate and asphalt Both plant mixes prepared by putting the modifier according to the present invention can be used. In particular, the plant mixing method is more preferable because it does not require a process of mixing asphalt and a modifier, and there is no fear of deterioration of physical properties due to phase separation and high temperature during storage.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are only presented to aid the understanding of the present invention, but the present invention is not limited thereto.

<Examples 1 to 5>

In a reactor maintained at 180 ° C, flakes of low density polyethylene (LDPE) were added to 100 parts by weight of straight asphalt (AP-5) at the ratio shown in Table 1 below, and a homogeneous mixer (model: J-UV) was added. The modified asphalt was prepared by mixing at 4000 rpm for 1 hour.

<Comparative Example 1>

A modified asphalt was prepared in the same manner as in Example 1, except that low density polyethylene (LDPE) was not used.

<Experimental Example 1 to 3>

In order to understand the physical properties of the modified asphalt prepared in Examples 1 to 5 and Comparative Example 1, the overall properties were measured by the following experimental method and the results are shown in Table 1 together.

1. Viscosity Analysis

Rheometer (model: MCR 300) is used to measure the flow of asphalt at a temperature of 60 ℃. This temperature is the surface temperature of summer asphalt roads. Therefore, the larger the numerical value (viscosity), the smaller the deformation, i.e., the stronger the plastic deformation.

2. Tine City (tensile strength)

Tensile strength tester (model: large diameter UTM) is used to measure the stiffness of asphalt at a temperature of 25 ° C. The larger the value, the greater the durability.

3. Toughness (amount of work)

The toughness of the asphalt at a temperature of 25 ° C. was measured using a tensile strength tester (model: large diameter UTM). The larger the value, the greater the durability.

TABLE 1

In Table 1, it can be seen that the viscosity at 60 ° C. is significantly increased as LDPE is added, thereby resisting plastic deformation, and the tensile strength is increased as LDPE is added to increase durability. The amount of work also increased significantly with the addition of LDPE, indicating that the durability increased. As such, it can be seen that in all formulations in which the amount of LDPE added is 10 parts by weight or less, all physical properties are superior to those of pure asphalt added without LDPE.

<Examples 6 to 11>

In a reactor maintained at 180 ° C., 5 parts by weight of flakes of low density polyethylene (LDPE) and 100 parts by weight of straight asphalt (AP-5) and dicumyl peroxide (DP), which is one of organic peroxides, are shown in Table 2 below. The modified asphalt was prepared by adding at the ratio shown in the Table and mixing the mixture at 4000 rpm for 1 hour using a homogeneous mixer (model: J-UV).

<Comparative Example 2>

A modified asphalt was prepared in the same manner as in Example 6 except that dicumyl peroxide (DP) was not used.

<Experimental Examples 4 to 6>

In order to understand the physical properties of the modified asphalt prepared in Examples 6 to 11 and Comparative Example 12, the overall properties were measured by the same method as Experimental Examples 1 to 3 and the results are shown together in Table 2.

TABLE 2

In Table 2, the viscosity at 60 ° C can be seen that the addition amount is greatly increased up to 2 parts by weight as DP is added to resist plastic deformation, the tensile strength is added as the DP is added It can be seen that the durability was increased by greatly increasing up to 2 parts by weight, and as the amount of work was also added, the addition amount was greatly increased up to 2 parts by weight, and the durability was increased. As such, it can be seen that in all formulations in which the amount of DP added is 2 parts by weight or less, all the physical properties are superior to those of the asphalt added without DP. This can be seen that the modified asphalt prepared according to the present invention has a great effect of preventing plastic deformation of the paved road and enhancing durability.

<Examples 12 to 17>

In a reactor maintained at 180 ° C., 5 parts by weight of flakes of low density polyethylene (LDPE) and 100 parts by weight of straight asphalt (AP-5) and rhoyl peroxide (LP), which is one of organic peroxides, are shown in Table 3 below. The modified asphalt was prepared by adding at the ratio shown in the Table and mixing the mixture at 4000 rpm for 1 hour using a homogeneous mixer (model: J-UV).

<Comparative Example 3>

A modified asphalt was prepared in the same manner as in Example 12, except that loroyl peroxide (LP) was not used.

<Experimental Examples 7 to 9>

In order to determine the physical properties of the modified asphalt prepared in Examples 12 to 17 and Comparative Example 18, the overall properties were measured in the same manner as in Experimental Examples 1 to 3 and the results are shown in Table 3.

TABLE 3

In Table 3, the viscosity at 60 ° C can be seen that the addition amount is greatly increased up to 2 parts by weight as LP is added to resist plastic deformation, the tensile strength is added as the LP is added It can be seen that the durability was increased by greatly increasing up to 2 parts by weight, and as the amount of work was also added, the addition amount was greatly increased up to 2 parts by weight, indicating that the durability was increased. As such, it can be seen that in all formulations in which the addition amount of LP is 2 parts by weight or less, all the physical properties are superior to that of the asphalt added without LP. This can be seen that the modified asphalt prepared according to the present invention has a great effect of preventing plastic deformation of the paved road and enhancing durability.

<Examples 18 to 23>

In a reactor maintained at 180 ° C., 5 parts by weight of flakes of low density polyethylene (LDPE) and 100 parts by weight of straight asphalt (AP-5) and dicumyl peroxide (DP), which is one of organic peroxides, are represented in Table 4 below. The modified asphalt was prepared by adding at the ratio shown in the Table and mixing the mixture at 4000 rpm for 1 hour using a homogeneous mixer (model: J-UV).

<Comparative Example 4>

A modified asphalt was prepared in the same manner as in Example 18, except that dicumyl peroxide (DP) was not used.

Experimental Example 10

In order to determine the elasticity of the modified asphalt prepared in Examples 18 to 23 and Comparative Example 4, by measuring the G '(storage modulus) of asphalt at 60 ℃ using a rheometer (model: MCR 300) Is shown in Table 4.

TABLE 4

In Table 4, it can be seen that the storage modulus of the asphalt at 60 ° C. increases as much as 2 parts by weight of DP is added, thereby significantly increasing the elasticity of the asphalt. As such, it can be seen that in all formulations in which the amount of DP added is 5 parts by weight or less, the elasticity is superior to that of the asphalt added without non-DP. It can be seen that when the organic peroxide is used together with the polyolefin, the reforming effect is more improved than when the polyolefin is used alone, and the modified asphalt prepared according to the present invention has a large effect of improving the elasticity of the paved road. You can see the effect.

<Examples 24 to 29>

In a reactor maintained at 180 ° C., 5 parts by weight of flakes of low density polyethylene (LDPE) and 100 parts by weight of straight asphalt (AP-5) and rhoyl peroxide (LP), which is one of organic peroxides, are represented in Table 5 below. The modified asphalt was prepared by adding at the ratio shown in the Table and mixing the mixture at 4000 rpm for 1 hour using a homogeneous mixer (model: J-UV).

<Comparative Example 5>

A modified asphalt was prepared in the same manner as in Example 24, except that loroyl peroxide (LP) was not used.

<Experiment 11>

In order to determine the elasticity of the modified asphalt prepared in Examples 24 to 29 and Comparative Example 5, by measuring the G '(storage modulus) of asphalt at 60 ℃ using a rheometer (model: MCR 300) Is shown in Table 5.

TABLE 5

In Table 5, it can be seen that the storage modulus of the asphalt at 60 ° C. increases as much as 2 parts by weight of LP is added, thereby significantly increasing the elasticity of the asphalt. As such, it can be seen that in all formulations in which the addition amount of LP is 5 parts by weight or less, the elasticity is superior to that of the added asphalt, not LP. It can be seen that when the organic peroxide is used together with the polyolefin, the modification effect is further improved than when the polyolefin is used alone, and the modified asphalt prepared according to the present invention has a great effect of enhancing the elasticity of the paved road. have.

Therefore, the asphalt modifier of the present invention made and functioned as described above and the asphalt composition comprising the same further improve the reforming effect in the modification of asphalt using a polymer (polyolefin) by using the first organic peroxide, and the second organic peroxide. Silver polyolefin network greatly improves the toughness and elasticity of asphalt concrete, thereby greatly preventing plastic deformation and durability of paved roads, thereby prolonging the life of the pavement, thereby dramatically reducing the cost of asphalt pavement and maintenance. This will provide a reduction effect.

Claims (12)

Asphalt modifier comprising a polyolefin and an organic peroxide. The asphalt modifier of claim 1, wherein the polyolefin comprises at least one of low density polyethylene, linear low density polyethylene, and high density polyethylene. The asphalt modifier of claim 1, wherein the polyolefin further comprises polyacrylate, polymethacrylate, ethylene vinyl acetate, and mixtures thereof. The asphalt modifier of claim 1, wherein the organic peroxide comprises at least one of dialkylperoxide, diacylperoxide, diperoxychital and peroxyester. The asphalt modifier of claim 1, wherein the organic peroxide further comprises dicumyl peroxide, rocyl peroxide, dibutyl peroxytrimethylcyclohexane, butyl perbenzoate and mixtures thereof. An asphalt composition comprising an asphalt modifier according to any one of claims 1 to 5, and asphalt. The method of claim 6, wherein the content of the asphalt modifier is 3 to 10 parts by weight, 0.1 to 5 parts by weight or less, preferably 3 to 5 parts by weight, 0.5 to 5 parts by weight of polyolefin and organic peroxide, respectively, based on 100 parts by weight of asphalt. Asphalt composition, characterized in that 2 parts by weight. 7. The asphalt according to claim 6, wherein the asphalt is at least one selected from the group consisting of gilsonite, glandpitch, grahamite, straight asphalt, asphalt cement, cutback asphalt, emulsified asphalt, blown asphalt and modified asphalt. Composition. 7. The asphalt composition of claim 6, further comprising aggregates, pigments, flavors or mixtures thereof. A method of producing an asphalt composition, comprising mixing the asphalt modifier according to any one of claims 1 to 5 to the asphalt when mixing the aggregate with the asphalt. Method for producing an asphalt composition, characterized in that when mixing the aggregate and asphalt, the asphalt modifier according to any one of claims 1 to 5 together. Modified asphalt, characterized in that it contains a composition according to any one of claims 6 to 9.