KR20180119716A - Asphalt modifier and method for preparing the same - Google Patents

Abstract

The present invention provides an asphalt modifier comprising a polyolefin having a double bond as a side chain and modified sulfur which is a reaction product of sulfur, a method for manufacturing the asphalt modifier, a method for manufacturing the asphalt concrete composition, and a composition thereof. The asphalt modifier according to the present invention can enhance the workability of the asphalt modifying work by enhancing the flowability of the asphalt.

Description

[0001] ASPHALT MODIFIER AND METHOD FOR PREPARING THE SAME [0002]

The present invention relates to an asphalt modifier comprising sulfur and a process for producing an asphalt modifier.

Conventional road pavement methods are classified into asphalt concrete (also called 'ascon'), commonly called asphalt pavement, and cement concrete pavement, commonly called concrete pavement.

Among them, asphalt pavement refers to road pavement covered with asphalt and it can be freely packed according to the purpose such as traffic volume, traffic load, roadbed support force of road. In addition, asphalt pavement is a soft pavement with low noise and resistance, high water resistance, dust and the like are not easily generated, and the vehicle can pass immediately after construction, which is widely used for road pavement.

On the other hand, since the abrasion and plastic deformation are large, the use period is shorter than that of the concrete pavement, and the maintenance cost is large. The advantages of such an asphalt pavement need to be further improved while solving the drawbacks.

Recently, various attempts have been made to solve problems of conventional asphalt pavement using sulfur as a concrete modifier. As one of them, attempts have been made to solve the disadvantages of asphalt pavement by modifying sulfur with dicyclopentadiene (DCPD).

However, DCPD conventionally used as a modifier for reforming sulfur has a bad smell due to the generation of unpleasant odors, resulting in a poor working environment, and even if it is modified. Further, in the case of asphalt modified with the conventional modified sulfur-based binder, there is a problem that the stretchability is low, the adhesion to the aggregate and the stretchability of the packaging are poor.

Further, a technique using sulfur modified SBS (sulfur modified polymer) in which sulfur is reacted with SBS (styrene butadiene styrene) as an asphalt modifier is disclosed. However, when the polymer is a modifier for SBS alone in the sulfur-modified polymer, there is a high possibility that brittle deformation, that is, breaking of the asphalt is likely to occur.

The present invention relates to a sulfur-modified polymer and an asphalt modifier composition and a modified asphalt composition containing the same, which are capable of eliminating the odor generated by using dicyclopentadiene in the production of a conventional modified sulfur molecular bond and improving the stretchability of the modified asphalt And an asphalt concrete composition.

Further, the present invention provides an asphalt modifier composition, a modified asphalt composition and an asphalt concrete composition containing sulfur-modified polymer having remarkably improved occurrence of brittle distortion as one embodiment.

The present invention also provides a process for producing the sulfur-modified polymer and an asphalt modifying process.

The present invention is not limited to the above-mentioned problems, but is intended to solve at least one of various results obtained from the matters described in the specification of the present invention.

The present invention provides an asphalt modifier, wherein the asphalt modifier provided in the present invention is a styrene butadiene styrene block copolymer (SBS); At least one polymer selected from the group consisting of polybutene, polyisobutylene, polyethylene (PE) and ethylene-vinyl acetate (EVA); And sulfur.

The asphalt modifier comprises 50 to 80% by weight of styrene butadiene styrene block copolymer (SBS), 10 to 40% by weight of the polymer and 10 to 30% by weight of sulfur.

The polyethylene may be HDPE, LDPE, LLDPE or a mixture of two or more thereof.

The asphalt modifier may further comprise at least one of slaked lime, diatomaceous earth and a viscosity. The amount of the asphalt modifier may be 0.1 to 15 parts by weight per 100 parts by weight of the sum of the styrene butadiene styrene block copolymer (SBS), the polymer and the sulfur have.

The asphalt modifier may further comprise at least one of wax and waste tire powder in an amount of 5 to 30 parts by weight based on 100 parts by weight of the sum of the styrene butadiene styrene block copolymer (SBS), the polymer and the sulfur.

The wax may have a weight average molecular weight of 1,000 to 100,000, a softening point of 100 to 300 and a viscosity at 150 of 10 to 250 cps.

The sulfur may be at least one selected from the group consisting of sulfur, polymerized sulfur, sulfur modified with DCPD, and sulfur combined with rubber modified with dicyclopentadiene.

The vulcanization accelerator may be added in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the total of the styrene butadiene styrene block copolymer (SBS), the polymer and sulfur.

The present invention relates to a process for preparing an asphalt modifier by mixing at least one polymer selected from the group consisting of styrene butadiene styrene copolymer (SBS), polybutene, polyisobutylene, PE and EVA, and sulfur, The method comprising the steps of:

Further, the present invention relates to a process for producing a sulfur-modified polymer by mixing at least one polymer selected from the group consisting of polybutene, polyisobutylene, PE and EVA and sulfur and reacting at 120-160 ° C, Mixing the modified polymer with a styrene butadiene styrene copolymer (SBS), and reacting the mixture at 120 to 160 캜 to prepare a sulfur-modified polymer.

The asphalt modifier of the present invention is inexpensive because the content of SBS is low as compared with the conventional asphalt modifier of SBS alone, and maintains its performance as an asphalt modifier even though the SBS content is small.

The asphalt modifier according to the present invention improves the flowability of the asphalt to improve the workability of the asphalt reforming operation.

Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention can be modified into various other forms, and the present invention is not limited to the embodiments described below.

The present invention provides an asphalt modifier obtained by reacting SBS, a polymer other than the SBS, and sulfur, and the asphalt modifier provided in the present invention provides a function of lowering the viscosity of the asphalt.

Conventionally, styrene butadiene styrene (SBS) has been used as such an asphalt modifier. This SBS provides a role to prevent plastic deformation by improving Marshall stability of asphalt concrete. However, the SBS is expensive and causes a large cost for asphalt reforming. Further, the addition of SBS to asphalt causes an increase in the viscosity of the asphalt, thereby causing a problem of significantly lowering the workability.

Accordingly, the present invention provides an asphalt modifier having an excellent workability by lowering the viscosity of the asphalt while maintaining the effect obtained when the SBS alone is used, by replacing a part of the SBS with other inexpensive components, and further, I want to.

As described above, the SBS is reacted with a polymer other than SBS and sulfur to produce an asphalt modifier.

Polybutene, polyisobutylene, polyethylene (PE), and ethylene vinyl acetate (EVA) are examples of polymers other than SBS that can be used in the present invention (hereinafter, simply referred to as "polymer" for convenience). These polymers can replace costly SBS, which can save costs and maintain SBS performance when used alone.

The polyethylene is not particularly limited, and HDPE, LDPE, and LLDPE can be used. Also, PE can suitably be used not only in new PE but also in recycled PE and waste PE.

The polybutene, polyisobutylene, polyethylene or ethylene vinyl acetate, which functions to improve the crack resistance of the asphalt concrete, can be used singly or in combination.

The polybutene, polyisobutylene, PE or EVA may be contained in an amount of 10 to 40% by weight based on 100% by weight of the sum of SBS, polymer and sulfur as the asphalt modifier provided in the present invention. If the amount is less than 10% by weight, the effect of reducing the cost due to SBS is small. If the amount is more than 40% by weight, the content of SBS is excessively decreased to lower the quality as a modifier. As a result, the temperature at low temperature is increased and low-temperature performance is deteriorated, or the asphalt becomes viscous when exposed to high temperature, resulting in deterioration of the holding performance at a high temperature. This eventually serves as a cause for lowering the grade as an asphalt modifier.

The asphalt modifier of the present invention comprises sulfur. The sulfur is not particularly limited and can be suitably used in the present invention as long as it is generally used. Generally, sulfur is a substance which is melted at a temperature of a melting point of 119 or more and is solid at room temperature, and is not particularly limited as long as it has such a general sulfur property and can be suitably used in the present invention.

Examples of such sulfur include natural sulfur or sulfur produced by desulfurization of petroleum or natural gas. Further, in the present invention, a modified sulfur in which the sulfur is modified by DCPD or the like and the general properties of sulfur may be used. Further, polymerized sulfur formed by melting at a temperature of 150 캜 or higher and then cooling can be used. At this time, it is preferable that the melting for polymerizing sulfur is not exceeded 180 占 폚 in order to prevent gelation. Further, sulfur modified with rubber modified with sulfur such as dicyclopentadiene (DCPD) may be used.

The sulfur can be used not only by melting a solid sulfur in a lump form, but also by using it in powder form.

Such sulfur contributes to the reduction of the SBS content in the asphalt modifier, thereby providing a cost saving effect and also improving the flowability of the asphalt modifier. That is, it contributes to lowering the viscosity and improving the workability of the asphalt. Also, it provides a function to improve adhesion to aggregates and the like, and asphalt is modified by sulfur, so that the concrete containing such asphalt can maintain stability even when it is exposed to water, and thus durability can be improved.

The sulfur is preferably contained in an amount of 10 to 30% by weight based on 100% by weight of the asphalt modifier. If the content of sulfur is less than 10% by weight, the addition amount of SBS is relatively increased, and the effect of reducing the cost is small, and the effect of improving the flowability and water resistance due to the use of sulfur can not be sufficiently obtained. The flowability of the asphalt is excessively lowered, and the workability may be lowered, and the stability of the Marshall may be lowered, which may cause deformation of the asphalt.

In the present invention, by adding at least one of polybutene, polyisobutylene, PE and EVA to SBS which is generally used as an asphalt modifier together with sulfur and reacting, the amount of SBS to be used is reduced to reduce the cost, To improve the disadvantages of the above. The asphalt modifier of the present invention can be obtained by reacting sulfur with polyolefin or SBS, and can be produced by first reacting SBS with sulfur and then reacting a polymer such as polybutene, polyisobutylene, PE or EVA But also SBS may be reacted first with a polymer such as polybutene, polyisobutylene, PE and EVA. The reaction is not particularly limited as it is a method of reacting sulfur, SBS, and polymer by melting.

For example, the reaction between sulfur and SBS can be carried out by melting sulfur, melting SBS and mixing, melting any one of sulfur and SBS, melting the other material by mixing with the molten material in the solid phase, . Thereafter, a polymer such as polybutene, polyisobutylene, PE, or EVA may be added to the sulfur-modified SBS and melted to be reacted.

As another embodiment, a sulfur-modified polymer can be prepared by first reacting a polymer such as polybutene, polyisobutylene, PE and EVA with sulfur, modifying the polymer to sulfur, and reacting the polymer with SBS. The reaction between sulfur and the polyolefin is not particularly limited as long as it can be conducted in the same manner as in the case of reacting sulfur and SBS. Subsequently, the asphalt modifier of the present invention can be prepared by mixing SBS and reacting with a polymer such as polybutene, polyisobutylene, PE, or EVA modified with sulfur.

As another embodiment, the reforming reaction may be performed by mixing the sulfur, SBS, and polymers such as polybutene, polyisobutylene, PE, and EVA in one unit.

The reaction between the sulfur and the SBS and the polymer is not particularly limited, but an asphalt modifying gel may be prepared by melting in a temperature range of 120 to 160 ° C and reacting for 1 to 30 minutes, for example, 1 to 20 minutes or the like .

The asphalt modifier of the present invention can be produced in the same manner as described above. The asphalt modifier thus obtained can suppress the extensibility of the asphalt concrete at low temperature and high temperature, in particular, the problem that the extensibility of asphalt is drastically reduced at low temperatures The grade of the asphalt can be improved. Furthermore, it is possible to reduce the use of expensive SBS while realizing such high quality, thereby contributing to cost reduction.

Also, the asphalt modified with the asphalt modifier according to the present invention can improve the workability when mixing the aggregate, improve the interlocking of the asphalt and the aggregate, and improve the durability and chemical resistance of the asphalt concrete have. Further, the resistance to moisture of the asphalt concrete can be improved.

In the reaction of the sulfur with the polymers such as polybutene, polyisobutylene, PE and EVA, a vulcanization accelerator may be further added to accelerate the crosslinking reaction. It forms a crosslinked structure between the rubber molecules and controls the elasticity of the rubber to control the extensibility of the modified asphalt. The vulcanization accelerator may be suitably used in the present invention as long as it is generally used. Examples of the vulcanization accelerator include guanidines, thio acid salts, isothiourea salts and amines, and amines are more preferably used.

The vulcanization accelerator is added in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the total of SBS, sulfur and the polymer. If the content of the vulcanization accelerator is less than 0.01 part by weight, the effect obtained by the use of the vulcanization accelerator is insufficient and the vulcanization reaction does not occur smoothly. If the content exceeds 1 part by weight, the cross- It becomes difficult to manufacture products of the present invention.

The asphalt modifier of the present invention may contain a SBS, sulfur and a reaction initiator in the polymer. Examples of the reaction initiator include DCP (dicumyl peroxide), DBP (dibenzoyl peroxide), MEKP (methyl-ethyl-ketone peroxide), t-butyl peroxybenzoate, di-2-ethylhexyl peroxyneodecano Butyl peroxypivalate, di-isopropyl peroxydicarbonate, bis (2,4-dichlorobenzoyl) peroxide, 1,1-bis (t-butylperoxy) -3,3,5-trimethyl Butyl peroxyneodecanoate, t-butyl peroxy-2-ethylhexanoate, di-3- (2-ethylhexyl) Organic peroxides such as methoxybutyl peroxydicarbonate, di-3,5,5-trimethylhexanonyl peroxide, and t-butylperoxy acetate, or organic peroxides such as FeCl ₃ , BCl ₃ , TiCl ₄ , AlCl ₃ And / or SnCl ₄ can be used as a reaction initiator. Any of these reaction initiators may be used singly or in combination of two or more.

The asphalt modifier of the present invention may comprise slaked lime, diatomaceous earth or clay in the SBS, sulfur and the polymer. They may include any one of them alone, or two or more of them at the same time. The reforming reaction of SBS, which is an asphalt modifier, is usually carried out at a temperature in the range of 120 to 160 DEG C, and SBS is easily burned in the above temperature range. At this time, when the slaked lime or the like is included, SBS contributes to suppress the property of burning during the reforming reaction. These may be added in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the total of SBS, sulfur and the polymer.

In addition, the asphalt modifier of the present invention increases the flowability of the asphalt by adding sulfur, and when the flowability is excessively high, the workability may be deteriorated. At this time, when the slaked lime is included, the viscosity can be increased, and the excessive flowability can be improved, thereby providing an effect of improving workability.

Furthermore, the asphalt modifier obtained by the present invention is preferably pulverized after being produced, and contributes to improving the pulverizability in the pulverization process for pulverization.

The slaked lime is preferably added in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the total of SBS, sulfur and polymer. The slaked lime is not particularly limited as long as it contains a small amount and can exhibit a predetermined effect due to the addition of the slaked lime in the present invention. For example, the slaked lime can be added in an amount of 0.1 part by weight or more. On the other hand, when the added amount of the slaked lime is more than 15 parts by weight, the viscosity is excessively increased and the workability can be impaired.

Further, the asphalt modifier of the present invention may further include at least one of wax and waste tire powder. The wax contributes to improving the asphalt properties at low temperatures, thereby lowering the freezing failure temperature to improve the low temperature grade of the asphalt. On the other hand, the waste tire powder plays a role of improving the characteristics at high temperature, and contributes to a higher temperature range in which the asphalt becomes viscous.

The wax and the waste tire powder may contain any one of them and may be added to the wax and the waste tire powder. The wax and the waste tire powder may contain sulfur and polybutene, polyisobutylene, PE and EVA By weight of a total of 100 parts by weight of the polymer of 5 to 30 parts by weight. If it is less than 5 parts by weight, it is insufficient to perform a role as a surfactant in a mixture of a polymer and sulfur. On the other hand, as described above, the wax is for uniform mixing of the polymer and sulfur, but if it is too large, it may interfere with the reaction between the polymer and sulfur. It is not preferable that the wax is added in an amount exceeding 30 parts by weight.

For example, the wax may have a weight average molecular weight of 1,000 to 100,000, a softening point of 100 to 300, such as 100 to 200 and 100 to 250, a viscosity at 150 of 10 to 250 cps, For example, 10 to 100 cps and 10 to 200 cps.

The wax having a property of melting usually at 20 to 150 may be used. For example, polymer waxes such as petroleum paraffin, Fischer-Tropsch paraffin, amide wax, Montan wax, polyethylene wax, and polypropylene wax, or esters of glycerol, and vegetable waxes are also suitably used Can be used.

In the present invention, the waste tire powder is an EPDM which is a rubber-based resin polymer as a synthetic rubber rubber powder recovered from a waste tire for a vehicle. In general, asphalt with added waste tires has high viscosity at high temperature and low stiffness at low temperature compared to general asphalt (AP-5). High viscosity maintenance at high temperature is resistant to high stress and deformation caused by traffic load So that the occurrence of plastic deformation is suppressed, and the low rigidity at low temperature increases the resistance to temperature cracking.

The waste tire fine powder used in the present invention may be a fine powder having an average particle size ranging from 70 mesh (211 탆) to 200 mesh (75 탆). If the average particle size is out of the predetermined range, the EPDM particles filling the pores of the asphalt mixture will not be able to function as rubber-based resin polymers due to the expansion of the EPDM particles. Of course, it is difficult to perform the test for the asphalt performance test. On the other hand, if the average particle size is smaller than a certain size, it is advantageous that the modified asphalt admixture is improved in compatibility with the asphalt in the early stage, but the EPDM fine powder is deteriorated due to the volume and scattering of the fine powder, There is a disadvantage that economical problems arise.

The asphalt modifier of the present invention may also comprise a rubber compounding oil. The rubber compounded oil 150 penetrates into the rubber molecules of the waste tire rubber powder to improve the dispersing ability by activating the softening action and the lubricating action on the rubber properties. The rubber compounded oil 150 is an aromatic rubber (Ca), a paraffin type (Cp) and stearic acid-based ones.

The Ca (aromatic) rubber compounding oil uses natural rubber, regenerated rubber, SBR, etc., and all the rubber oil penetrates into the rubber molecules and softens and lubricates swelling property and rubber property. In addition, Cp (paraffinic) rubber blend oils may be used in some parts of raw rubber, SBR. In addition, the stearic acid rubber compounded oil is a solid material prepared by adding an oxidizing agent to animal fats and plant fats as raw materials, and may be added in an amount of 5% by weight or more based on 100% by weight of the rubber raw material.

Furthermore, antioxidants may also be included. The antioxidant serves to prevent aging of the waste tire rubber powder. Since the waste tire rubber powder may cause aging due to oxygen, ozone, alkali, ultraviolet rays, wind speed, etc., antioxidants may be used in an amount of about 1 to 2% by weight based on 100% by weight of the rubber of the waste tire rubber powder . Here, the antioxidant may be selected from one or two kinds selected from amine-based antioxidants and phenol-based antioxidants.

The asphalt modifier of the present invention may also optionally contain carbon black. The carbon black may be industrially produced by collecting soot generated by incomplete combustion of natural gas or tar, or by pyrolyzing them. The carbon black contributes to stabilizing the aged properties of the waste tire fine powder and maintaining the black color of the asphalt mixture at the same time. It is preferable that the particles do not have a fine chain-like bond and carbon black powder having an average particle size of 100 mesh (152 탆) to 200 mesh (75 탆) is used.

The asphalt modifier of the present invention may also comprise process oil to be produced in a plant mixing type if desired. Said process oil can contribute to the rapid dissolution of SBS by improving the SBS solubility in asphalt. The process oil may be paraffin oil, naphthene oil, aromatic oil or the like. In particular, the aromatic oil is more preferable because it weakens the PS (polystyrene) domain of the SBS to improve the solubility of SBS. The process oil may be contained in an amount of 8 to 12 parts by weight based on 100 parts by weight of the sum of SBS, the polymer and sulfur of the present invention.

Further, the asphalt modifier of the present invention may be added with a petroleum resin in order to react rapidly in the plant mixing method in the production of asphalt concrete to further increase the dissolution rate. The petroleum resin is a kind of tackifier resin and performs the function of improving the adhesive force of asphalt and the softening point and viscosity at high temperature properties. Examples of the petroleum resin applicable to the present invention include rosin resin, C ₅ resin, C ₉ resin, terpene resin and the like, and the softening point is preferably 90 to 150 degrees. The petroleum resin may be added in an amount of 22 to 27 parts by weight based on 100 parts by weight of the total of SBS, the polymer and sulfur.

The asphalt modifier obtained by the present invention is preferably used in an amount of 1 to 15 parts by weight based on 100 parts by weight of the asphalt. When the content of the asphalt modifier satisfies the above range, the effect of improving the extensibility of the asphalt concrete at a high temperature and a low temperature can be obtained. Particularly, it is possible to prevent a problem that the extensibility of asphalt is drastically lowered at a low temperature and plastic deformation at a high temperature. Also, it is excellent in resistance to moisture and can improve the adhesion to aggregate.

In the present invention, the asphalt modifier is not particularly limited so long as it can be mixed and modified with asphalt by a conventional method. For example, the asphalt may be melted, the asphalt modifier may be added to the molten asphalt, and the molten asphalt may be added in a solid phase.

The melting of the asphalt can be carried out in a hot-air dryer to have fluidity. At this time, the temperature for providing fluidity by the hot air dryer can be performed by heating to 160 or more.

In this case, when the asphalt modifier is added to the molten asphalt, it is desirable that the asphalt is maintained in a molten state to improve the workability and to mix the asphalt modifier with the asphalt modifier. Preferably, the asphalt is maintained at a temperature of 160 or more, .

Further, in mixing the asphalt modifier with the flowable asphalt, it is preferable that the asphalt modifier is also mixed in a molten state. The asphalt modifier of the present invention has a characteristic of being melted at a temperature of 120 or more and 120 to 160, and can be mixed with asphalt after being heated to a temperature above the melting temperature and melted.

Meanwhile, the asphalt modifier of the present invention can be added to the molten asphalt as a solid phase. At this time, the asphalt modifier may be added in the form of a lump or powder. When the asphalt modifier is powdered and added by pulverization or the like, the rate of melting in the asphalt can be improved, which is more preferable. After the asphalt modifier is added to the asphalt, it can be homogeneously mixed with a stirrer having a high shear force for about 1 to 4 hours, for example.

As described above, modified asphalt having improved properties according to low temperature and high temperature of asphalt can be obtained by including the asphalt modifier according to one embodiment of the present invention.

The modified asphalt of the present invention may contain an odor remover if necessary. The deodorizing agent is added to remove asphalt peculiar odors generated during the field construction or production process. Especially, it is known that it produces the most odor in the production of asphalt mixture, and it gives discomfort to the constructor and the surrounding city center in the asphalt pavement site. Accordingly, the modified asphalt according to the embodiment of the present invention is intended to reduce the discomfort of the customer by improving the smell of the asphalt, which is the raw material that is the source of the smell.

The deodorizer according to the embodiment of the present invention is a phytoncide component of essential oil extracted from 100% natural plants (200 kinds), harmless to human body, electrostatically binds to a substance causing odor, converts into an organic salt form, At this time, the smell can be removed with a high dilution rate at a low cost, and the smell removing agent has a dilution ratio of 200 ppm to 5,000 ppm. Here, Phytoncide is a term that refers to all the materials with bactericidal properties produced by the plants in the forest, and the main ingredient is terpenes.

Therefore, when the modified asphalt is mixed with the aggregate to produce the asphalt concrete, excellent ductility can be obtained and excellent physical properties can be obtained even at low temperature and high temperature. In addition, it is resistant to moisture and excellent in adhesion to aggregates, so that high-quality asphalt concrete can be obtained.

At this time, the modified asphalt may be mixed with 100 parts by weight of the aggregate according to the mixing ratio conventionally used. For example, the modified asphalt may be used in an amount of 4 to 10 parts by weight.

The aggregate may be suitably used in the present invention as long as it is generally used in the production of asphalt concrete. For example, the aggregate includes sand, gravel, and crushed stone, and various kinds of industrial waste, fly ash, silica, silica, quartz, clay, and glass powder that can be recycled are available.

The asphalt concrete composition may also include resins such as epoxy resin, MMA (Methyl Methacrylate) resin, and latex resin.

The asphalt concrete composition may further include various minerals such as natural aggregate, artificial aggregate, slag, coal ash, fly ash, and silica fume as mineral powders. The above-mentioned mineral fine powder has a particle diameter of 70 mu m or less. These mineral fine powders may contain an amount of 20 to 50 parts by weight based on 100 parts by weight of the modified sulfur binding material.

As described above, the modified asphalt concrete composition of the present invention can produce asphalt concrete by mixing the asphalt modifier with the molten asphalt, modifying the asphalt, and mixing the asphalt with the aggregate.

Meanwhile, the asphalt concrete composition comprising the asphalt modified by the asphalt modifier according to a preferred embodiment of the present invention can improve the temperature characteristics at high temperature and low temperature compared with the conventional one.

Therefore, it is possible to further reduce the noise and resistance during driving, further increase the resistance to moisture, and increase the curing speed, thereby enabling the vehicle to pass immediately after the road construction, which is one of the advantages of the asphalt pavement, It is more preferable to extend the lifetime of the asphalt pavement due to the high durability against low temperature and high temperature.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And additions should be considered as falling within the scope of the following claims.

Example

The present invention will be described in more detail with reference to the following examples. The following examples are illustrative of one embodiment of the present invention, but the present invention is not limited thereto.

Example  1 to 4

SBS, LDPE and sulfur were mixed at the contents (% by weight) as shown in Table 1, and they were melted at 130 to 150 캜 and reacted for about 20 minutes. During the reaction, the total amount of SBS, LDPE and sulfur (Parts by weight) as shown in Table 1 to prepare an asphalt modifier.

On the other hand, during the reaction, wax or waste tire powder (CMR) was added in an amount (parts by weight) as shown in Table 1 to 100 parts by weight of the total of SBS, LDPE and sulfur.

As a result, an asphalt modifier was obtained and the obtained asphalt modifier was pulverized to prepare an asphalt modifier powder.

After the asphalt was melted at a temperature of 140 ° C, the asphalt modifier powder was added in an amount of 5 parts by weight based on 100 parts by weight of the molten asphalt, and the resulting mixture was mixed by a shear force mixer for about 2 hours to prepare modified asphalt.

Example No. 2. SBS LDPE brimstone Lime lime Wax CRM One 60 30 10 2 - - 2 60 30 10 2 10 - 3 60 30 10 2 - 15

The physical properties of the modified asphalt obtained in Examples 1 to 3 were evaluated, and the results obtained in the Examples are shown in Tables 2 and 3, respectively. Table 2 shows the results of evaluating the low-temperature characteristics, and Table 3 shows the results of evaluating the high-temperature characteristics.

Example
No. Measuring temperature
℃ Measuring time
sec. Stiffness
M (MPa)
Actual stiffness M Value
(60 seconds when
inclination) Test
Status Low service
Temp. (占 폚) Failure
Temp.
(° C) One -6 60 45.5577 0.392262 Pass -22 -13 -12 60 106.6937 0.314932 Pass -13 60 122.3423 0.299373 Pass 2 -6 60 29.4668 -0.107928 Pass -22 -18 -12 60 78.4655 -0.057994 Pass -17 60 159.7129 -0.236693 Pass -18 60 184.2349 0.239214 Pass 3 -6 60 58.3753 0.406854 Pass -22 -14 -12 60 176.5695 0.304696 Pass -13 60 182.8938 0.295982 Pass

Example
No. Temperature
℃ G * / Sin? Test
Status High service
Tepm. (占 폚) Failure
Temp. (占 폚) One 64 4.63 Pass 76 78.0 70 2.32 Pass 76 1.22 Pass 82 0.66 Pass 2 64 3.63 Pass 76 78.58 70 1.99 Pass 76 1.25 Pass 82 0.74 Pass 3 64 3.67 Pass 88 96.1 70 2.73 Pass 76 2.17 Pass 82 1.76 Pass 88 1.38 Pass

Claims (13)

Styrene butadiene styrene block copolymer (SBS);
At least one polymer of polybutene, polyisobutylene, polyethylene (PE) and ethylene vinyl acetate (EVA); And
brimstone
The asphalt modifier thus reacted.
The composition according to claim 1, which comprises 50 to 80% by weight of styrene butadiene styrene block copolymer (SBS), 10 to 40% by weight of at least one polymer of polybutene, polyisobutylene, polyethylene (PE) and ethylene vinyl acetate (EVA) And 10 to 30% by weight of sulfur.
The asphalt modifier according to claim 1, wherein the polyethylene is HDPE, LDPE, LLDPE or a mixture of two or more thereof.
The asphalt modifier according to claim 1, further comprising at least one selected from the group consisting of calcium hydroxide, diatomaceous earth and clay.
5. The method according to claim 4, wherein at least one selected from the group consisting of the slaked lime, diatomaceous earth and clay is 0.1 to 15 parts by weight based on 100 parts by weight of the sum of the styrene butadiene styrene block copolymer (SBS), the polymer and the sulfur Asphalt modifier.
The asphalt modifier according to claim 2, further comprising an asphalt modifier, wherein the asphalt modifier is selected from the group consisting of styrene butadiene styrene block copolymer (SBS); At least one polymer of polybutene, polyisobutylene, PE and EVA; And 2 to 10 parts by weight based on 100 parts by weight of sulfur.
The method according to claim 2, wherein at least one of the wax and the waste tire powder is a styrene butadiene styrene block copolymer (SBS); At least one polymer of polybutene, polyisobutylene, PE and EVA; And sulfur in an amount of 5 to 30 parts by weight with respect to 100 parts by weight of the total amount of sulfur.
7. The method of claim 6, wherein at least one of the wax and the waste tire powder is a styrene butadiene styrene block copolymer (SBS); At least one polymer of polybutene, polyisobutylene, PE and EVA; And sulfur in an amount of 5 to 30 parts by weight with respect to 100 parts by weight of the total amount of sulfur.
The asphalt modifier according to claim 8, wherein the wax has a weight average molecular weight of 1,000 to 100,000, a softening point of 100 to 300, and a viscosity at 150 of 10 to 250 cps.
The asphalt modifier according to claim 1, wherein the sulfur is at least one selected from the group consisting of sulfur, polymerized sulfur, sulfur modified with DCPD, and rubber combined with dicyclopentadiene modified rubber.
The method of claim 2, wherein the styrene butadiene styrene block copolymer (SBS); At least one polymer of polybutene, polyisobutylene, PE and EVA; Wherein the vulcanization accelerator is contained in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the total of sulfur and sulfur.
A process for producing an asphalt modifier comprising the steps of mixing a styrene butadiene styrene copolymer (SBS), polybutene, polyisobutylene, PE or EVA polymer and sulfur, and reacting the mixture at 120-160 ° C to produce an asphalt modifier.
Mixing at least one of polybutene, polyisobutylene, PE and EVA with sulfur, and reacting at 120 to 160 DEG C to produce a sulfur-modified polymer; And
Mixing the sulfur-modified polymer with a styrene-butadiene styrene copolymer (SBS), and reacting at 120-150 ° C to prepare a sulfur-modified polymer
≪ / RTI >