KR101349931B1 - Dry mix asphalt modifier comprising polypropylene non-woven fabrics dispersed therein and manafacturing method thereof - Google Patents

Abstract

The present invention relates to 100 parts by weight of styrene-butadiene-styrene block copolymer, ii) aromatic hydrocarbon petroleum resin, aliphatic hydrocarbon petroleum resin, dicyclopentadiene petroleum resin, polybutene, coumarone-indene resin, 5 to 60 parts by weight of one or more tackifying resins selected from the group consisting of polyterpene resins, terpene phenol resins, rosin, rosin esters, and hydrogenated additives thereof, i) 20 to 80 parts by weight of process oil, and iii) poly 5 to 35 parts by weight of propylene nonwoven fabric, wherein iii) the polypropylene nonwoven is dispersed in a molten mixture of iii) styrene-butadiene-styrene block copolymer, ii) tackifying resin and iii) process oil It relates to a dry asphalt modifier and a method for producing the same. The dry asphalt modifier according to the present invention maintains a polypropylene nonwoven fabric in a dispersed form without melting in the modifier, and when the asphalt concrete is manufactured in a dry method in a plant, the polypropylene nonwoven fabric was present in a dispersed form in the modifier. While melting, it is possible to improve the dissolution rate of the modifier.

Description

DRY MIX ASPHALT MODIFIER COMPRISING POLYPROPYLENE NON-WOVEN FABRICS DISPERSED THEREIN AND MANAFACTURING METHOD THEREOF}

The present invention relates to a dry asphalt modifier, and more particularly, a polypropylene nonwoven fabric which is capable of producing asphalt concrete having a high common grade by improving the dissolution rate of the modifier when preparing the modified asphalt mixture by the dry method. It relates to a dry asphalt modifier and a method for producing the same.

Asphalt is black at room temperature and has a very solid semi-solid viscosity. It is classified into several grades based on its rigidity. Asphalt is tested using the asphalt penetration test result of ASTM D946 and PG grade of ASTM D6373. Can be classified.

Asphalt has different characteristics depending on the temperature, and at high temperatures, it becomes highly viscous and soft, while it is hard at low temperatures, and thus has good cracking properties. Therefore, when manufacturing ascon with asphalt having such characteristics and constructing it on the road, high temperature firing of ascon occurs when the air temperature rises as in summer, and low temperature of ascon when the air temperature decreases as in winter. There is a problem that causes cracking.

In order to improve the temperature characteristics of such asphalt, modified asphalt which has improved physical properties by mixing various additives with asphalt is widely used. Examples of the modifier used in the modified asphalt include additives such as styrene-butadiene-styrene block copolymers, polyolefin resins or styrene-butadiene rubbers. Of these, styrene-butadiene-styrene block copolymers are most widely used.

Modified asphalt is classified according to asphalt performance grade (PG) specification, and specifically, it is classified by five performances such as aging, plastic deformation, fatigue cracking and low temperature cracking using equipment such as DSR and BBR. Can be. Asphalt compatibility grade is expressed as PG ○○-○○, for example, PG 76-22 has a physical property that can maintain the durability and bearing capacity as asphalt up to at least 76 ℃, up to -22 ℃ as a binder for road pavement It indicates the durability against low temperature. Therefore, modified asphalt is classified as high performance modified asphalt as the asphalt's common grade is higher.

In general, the higher the molecular weight of the styrene-butadiene-styrene block copolymer, the higher the molecular weight, the higher the softening point, the viscosity and the common grade of asphalt when dissolved in asphalt, but the more time required to dissolve in asphalt there is a problem.

The method of manufacturing modified asphalt for road is a wet type in which a pellet or crumb-type modifier is melted at high temperature in a large melting facility and melted at a high temperature, and then transferred to an asphalt concrete plant and mixed with aggregate and asphalt, and aggregate in an asphalt concrete plant. When mixing asphalt with a modifier may be divided into a dry type for producing ascone.

The wet type is generally used for pavement as it is suitable for mass production. However, if the transport distance is far, the asphalt may age and cause performance deterioration. In the case of using a small amount of asphalt due to the short paving interval, it is not suitable for the operation of the process, and phase separation phenomenon occurs in which the modifier and the asphalt are separated during storage or transportation. Can be.

In the dry type, there is no storage process, so it is possible to minimize the deterioration of physical properties due to high temperature in the phase separation phenomenon and manufacturing process, and the short section pavement, road pavement, road maintenance and drainage that are difficult to apply wet type It can be widely used for special asphalt pavement. In particular, in the dry type, it is important to allow the modifier to dissolve in asphalt in a short time. If the melting time is late, a problem arises in that the working time is delayed in the production of the asphalt mixture, or the modifier is not sufficiently melted, so that it cannot exhibit sufficient performance as the modified asphalt.

In order to solve this problem, dry asphalt modifier composition using a styrene-butadiene-styrene block copolymer mixed with a tackifying resin and a processing aid is known, but these dry modifiers are also used to improve the common grade of asphalt When using a high viscosity styrene-butadiene-styrene block copolymer there is a limit to the melt rate.

Therefore, when the modified asphalt mixture using the asphalt modifier is manufactured by the dry method, it is necessary to improve the dissolution rate of the asphalt modifier and dissolve it evenly in a short time, and to obtain a higher common grade when using the same amount of the dry modifier. Dry asphalt modifiers are required.

When the modified asphalt mixture is prepared by the dry method, the polypropylene nonwoven fabric dispersed in the asphalt modifier is melted to improve the dissolution rate of the asphalt modifier and to produce the asphalt concrete having a high common grade. It is an object of the present invention to provide a dry asphalt modifier in which is dispersed and a method for producing the same.

The dry asphalt modifier of the present invention for solving the above problems iii) aromatic petroleum resin, aliphatic hydrocarbon petroleum resin, dicyclopentadiene petroleum resin with respect to 100 parts by weight of styrene-butadiene-styrene block copolymer 5 to 60 parts by weight of at least one tackifying resin selected from the group consisting of polybutene, coumarone-indene resin, polyterpene resin, terpene phenol resin, rosin, rosin ester, and hydrogenated products thereof, i) process oil 20 to 80 parts by weight, and iii) 5 to 35 parts by weight of a polypropylene nonwoven fabric, wherein iii) the polypropylene nonwoven fabric comprises iii) a styrene-butadiene-styrene block copolymer, ii) a tackifying resin and the iii) process And dispersed in a molten mixture of oil.

In addition, the method for producing the dry asphalt modifier of the present invention includes: i) aromatic hydrocarbon petroleum resin, aliphatic hydrocarbon petroleum resin, dicyclopentadiene petroleum resin, and polybutene based on 100 parts by weight of styrene-butadiene-styrene block copolymer. , 5 to 60 parts by weight of one or more tackifying resins selected from the group consisting of coumarone-indene resins, polyterpene resins, terpene phenol resins, rosin, rosin esters, and hydrogenated additives thereof, and 20 to 80 parts by weight of process oil. Melt mixing; And ii) dispersing 5 to 35 parts by weight of polypropylene nonwoven with respect to 100 parts by weight of the styrene-butadiene-styrene block copolymer in the molten mixture of vi).

The dry asphalt modifier according to the present invention maintains a polypropylene nonwoven fabric in a dispersed form without melting in the modifier, and when the asphalt concrete is manufactured in a dry method in a plant, the polypropylene nonwoven fabric was present in a dispersed form in the modifier. While melting, it is possible to improve the dissolution rate of the modifier.

In addition, since polypropylene has excellent mechanical rigidity, it is possible to obtain asphalt concrete having a high common grade by the molten polypropylene nonwoven in the asphalt concrete manufacturing step.

1 is a specimen photograph of 0.2 mm thick formed by pressing the modifiers of Example 1 and Comparative Example 6 at 120 ° C., respectively.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

One aspect of the present invention is iii) 100 parts by weight of styrene-butadiene-styrene block copolymer, ii) aromatic hydrocarbon petroleum resin, aliphatic hydrocarbon petroleum resin, dicyclopentadiene petroleum resin, polybutene, coumarone- 5 to 60 parts by weight of one or more tackifying resins selected from the group consisting of indene resins, polyterpene resins, terpene phenol resins, rosin, rosin esters, and hydrogenated products thereof, i) 20 to 80 parts by weight of process oil, and Iii) 5 to 35 parts by weight of a polypropylene nonwoven, wherein iii) the polypropylene nonwoven is dispersed in a molten mixture of iii) styrene-butadiene-styrene block copolymer, ii) tackifying resin and iii) process oil It relates to a dry asphalt modifier, characterized in that.

Styrene-butadiene-styrene block copolymer included in the dry asphalt modifier according to an aspect of the present invention is used as an asphalt modifier to improve the physical properties of the asphalt with temperature.

The styrene-butadiene-styrene block copolymer may be used without particular limitation as long as it is generally used in the art, but specifically, the styrene content is 25 to 40% by weight, and the weight average molecular weight is in the range of 80,000 to 250,000 g / mol. Phosphorus linear or branched copolymers can be used.

If the styrene content of the styrene-butadiene-styrene block copolymer is less than 25% by weight, the elasticity is insufficient, so that physical properties such as softening point may be lowered when the asphalt is modified.In the case of more than 40% by weight, the plastic properties become stronger due to the asphalt modification effect. There is not a big problem.

In addition, when the weight average molecular weight of the styrene-butadiene-styrene block copolymer is less than 80,000 g / mol, the asphalt modification effect may not be large. If the weight-average molecular weight exceeds 250,000 g / mol, the viscosity and the phase transition temperature may be too high, thereby modifying the asphalt as a modifier. There is a difficulty in melting, the pellet processing temperature is too high during the manufacture of the modifier to melt the polypropylene nonwoven fabric during the process is difficult to disperse the modifier during asphalt concrete manufacturing.

The tackifying resin included in the dry asphalt modifier according to an aspect of the present invention serves to improve the physical properties of the asphalt mixture by increasing the adhesion between the asphalt and the aggregate when preparing the asphalt mixture.

The tackifying resin is preferably included in the range of 5 to 60 parts by weight based on 100 parts by weight of the styrene-butadiene-styrene block copolymer. When the amount of the tackifying resin is less than 5 parts by weight with respect to 100 parts by weight of the styrene-butadiene-styrene block copolymer, the adhesion between the asphalt and the aggregate is weak during the production of the asphalt mixture, and when the amount is greater than 60 parts by weight, the aggregation phenomenon occurs. Machining becomes difficult and leads to additional processing cost increase.

Tackifying resins include aromatic hydrocarbon petroleum resins, aliphatic hydrocarbon petroleum resins, dicyclopentadiene petroleum resins, polybutenes, coumarone-indene resins, polyterpene resins, terpene phenol resins, rosin, rosin esters, and hydrogens thereof It is preferable that it is at least 1 type selected from the group which consists of an additive.

In particular, it is preferable to use an aromatic hydrocarbon-based petroleum resin having a softening point of 70 to 170 ° C in terms of improving physical properties by increasing adhesion between asphalt and aggregate.

Process oil included in the dry asphalt modifier according to an aspect of the present invention is used as a processing aid, aromatic process oil, paraffin process oil or mixtures thereof may be used.

Process oil is preferably included in the range of 20 to 80 parts by weight based on 100 parts by weight of styrene-butadiene-styrene block copolymer. When the amount of the process oil is less than 20 parts by weight based on 100 parts by weight of the styrene-butadiene-styrene block copolymer, the flowability during processing is low, solubility in asphalt is reduced, and the pellet processing temperature is too high when the modifier is manufactured, so that the poly The propylene nonwoven fabric has a problem that it is difficult to melt the modifier during asphalt concrete production. On the other hand, when the amount of the process oil exceeds 80 parts by weight with respect to 100 parts by weight of the styrene-butadiene-styrene block copolymer, the physical properties of the modified asphalt composition have no significant effect, but after the preparation of the modifier, the process oil in the modifier elutes to the surface of the modifier. This will cause difficulties in handling.

The polypropylene nonwoven fabric included in the dry asphalt modifier according to an aspect of the present invention is present in a dispersed form without melting in the prepared modifier, but is melted in the asphalt concrete manufacturing step to improve the dissolution rate of the modifier and to the polypropylene. It is possible to produce asphalt concrete of high compatibility grade.

The polypropylene nonwoven fabric is preferably included in the range of 5 to 35 parts by weight based on 100 parts by weight of styrene-butadiene-styrene block copolymer. When the amount of the polypropylene nonwoven fabric is less than 5 parts by weight based on 100 parts by weight of the styrene-butadiene-styrene block copolymer, there is a fear that the dissolution rate of the modifier is lowered when the modifier is melted on the asphalt, and when the amount is greater than 35 parts by weight. Due to poor flowability, the process of molding the modifier into pellets may cause an excessive load on the equipment and affect the low temperature properties of the modifier.

Polypropylene nonwovens can be made using short polypropylene fibers.

Polypropylene short fibers used in the production of polypropylene nonwovens are fibers made using a polypropylene resin, but the type thereof is not particularly limited, but the thickness of the fibers is preferably about 7 to 100 μm.

It is preferable that melt temperature of polypropylene short fiber is 146-170 degreeC. If the melting temperature of the short polypropylene fiber is less than 146 ° C, since the nonwoven fabric made of the short polypropylene fiber cannot be melted and dispersed in the modifier at the time of producing the modifier, the dissolution rate of the modifier may be affected during asphalt concrete production. do. On the other hand, when the melting temperature exceeds 170 ℃ there is a difficulty in melting the modifier in the asphalt when manufacturing asphalt concrete.

Processes for preparing nonwoven fabrics from short polypropylene fibers are well known in the art, for example, polypropylene short fibers may be prepared in the form of fabrics by binding the fiber aggregates through mechanical, chemical or thermal treatments. It is not limited.

By using the polypropylene nonwoven fabric as described above, it can be more uniformly and easily dispersed in the modifier at the time of preparation of the modifier than the short fiber itself.

The polypropylene nonwovens may not be particularly limited in size or shape depending on the modifier manufacturing equipment, or the size may be limited to a range, for example about 3 cm or less.

In one embodiment, the dry asphalt modifier according to the aspect may further comprise one or more selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants.

In one embodiment, the dry asphalt modifier according to the aspect may be in the form of pellets.

According to another aspect of the present invention, i) aromatic hydrocarbon based petroleum resin, aliphatic hydrocarbon based petroleum resin, dicyclopentadiene based petroleum resin, polybutene, coumarone-indene based on 100 parts by weight of styrene-butadiene-styrene block copolymer Melt mixing 5 to 60 parts by weight of one or more tackifying resins selected from the group consisting of resins, polyterpene resins, terpene phenol resins, rosin, rosin esters, and hydrogenated additives thereof and 20 to 80 parts by weight of the process oil; And ii) dispersing 5 to 35 parts by weight of polypropylene nonwoven with respect to 100 parts by weight of the styrene-butadiene-styrene block copolymer in the molten mixture of vi).

The melt-kneading apparatus and conditions used for melt mixing of i) can use well-known polymer melt mixing equipment and conditions, as long as it does not deviate from the objective of this invention.

Such examples include single screw or twin screw extruders, kneader or balm mixers, and the like. When using a single or twin screw extruder, the polypropylene nonwoven fabric should be cut to an appropriate size, for example about 3 cm or less, for ease of feeding, and the size and shape of the polypropylene nonwoven fabric is limited when using a kneader or balvarie mixer. It doesn't work.

The melt mixing of iii) and the dispersion of ii) are 110 to 100 in terms of the temperature range in which the propylene-butadiene-styrene block copolymer, the tackifying resin and the process oil are melted, and the polypropylene nonwoven fabric can be dispersed without melting. It is preferable to make it at the temperature of 145 degreeC.

If the temperature at which the melt mixing of i) and the dispersion of ii) is less than 110 ° C. is too low, the melt mixing becomes difficult, and the viscosity of the modifier is high, making processing difficult. If the temperature exceeds 145 ° C, the polypropylene nonwoven fabric may not be present in the form of molten and dispersed in the modifier during manufacture of the modifier, thereby affecting the melt rate of the modifier during asphalt concrete production.

In one embodiment, after step ii), it may further comprise the step of cooling the mixture, and molding the cooled mixture in the form of pellets.

In one embodiment, in the step iii), it may further comprise mixing at least one additive selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants.

In the method for producing the dry asphalt modifier, the styrene-butadiene-styrene block copolymer, the tackifying resin, and the process oil are melt mixed, and the polypropylene nonwoven fabric is dispersed in the melt mixture.

However, in the method for producing a dry asphalt modifier according to another aspect of the present invention, a styrene-butadiene-styrene block copolymer, a tackifying resin, a process oil, and a polypropylene nonwoven fabric are styrene-butadiene-styrene block copolymers. While the tackifying resin and process oil are melted, the polypropylene nonwovens may be mixed together at a temperature that does not melt. By mixing at such temperature conditions, it is possible to produce a dry asphalt modifier in which a polypropylene nonwoven fabric is dispersed in a molten mixture of styrene-butadiene-styrene block copolymers, tackifying resins, and process oils.

Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are illustrative of the present invention, and the scope of the present invention is not limited to the following examples.

[ Example ]

1. Experimental material

AP 5: Asphalt Grade 60 to 80 with Asphalt Grade 70 (PG 64-22)

SBS 1: Linear styrene-butadiene-styrene block copolymer having a weight average molecular weight of 100, OO g / mol and a styrene content of 33% by weight

SBS 2: Linear styrene-butadiene-styrene block copolymer having a weight average molecular weight of 150, OOO g / mol and a styrene content of 33% by weight

SBS 3: Linear styrene-butadiene-styrene block copolymer having a weight average molecular weight of 300, OOO g / mol and a styrene content of 33% by weight

Tackifying Resin: Aromatic Hydrocarbon Petroleum Resin with Softening Point of 110 ℃

Process oil: paraffinic oil with 40 ° C kinematic viscosity of 100 cSt

PP nonwoven fabric: 0.5mm thick polypropylene nonwoven fabric consisting of short polypropylene with melting temperature of 155 ° C

PP: Pellet-shaped polypropylene with a melting temperature of 155 DEG C and a diameter of 0.5 to 1.0 mm

2. Experimental Method

(1) For the evaluation of solubility in asphalt, which is the most important item in dry asphalt modifier, the dissolution time of the modifier in asphalt was measured by referring to the "Sampling Method of Modified Asphalt" described in the Pavement Test Manual established by the Japan Road Association. And the results are shown in Tables 3 and 4. Asphalt used was AP 5, and 8 wt% of the modifier was added to the asphalt at 180 ° C., and the mixture was mixed at 3,000 rpm to evaluate the time when the modifier was completely dissolved.

(2) Evaluation of the physical properties of each asphalt (AP 5) including the modifier was based on the PG test. To determine the PG grade, the low and high temperature properties are measured. First, in order to evaluate the low temperature properties, the asphalt was measured by PAV (Pressure Aging Vessel), and then mvalue value by BBR (Bending Beam Rheometer). The low grade grade of PG was determined by the temperature at which the m-value value was greater than 0.3 in the BBR test at 12 ° C. In order to evaluate the high temperature properties of asphalt, DSR (DynamicShear), which is mixed with aggregate at high temperature in the early stage of the production of ascon, and then subjected to the Rolling Thin Film Oven Test (RTFO), which simulates the aging of the process of moving and laying the site G * / sinδ was measured at 64 ° C., 70 ° C., 76 ° C., and 82 ° C. using a Rheometer, and the temperature at which the G * / sin δ value was 2.2 Pa or more was determined as the high temperature grade of PG. At this time, the higher the G * / sin δ at the same temperature has a higher temperature stability.

3. Modifier  Of asphalt and modified asphalt

(1) Example 1

100 parts by weight of a linear styrene-butadiene-styrene block copolymer having a weight average molecular weight of 100,000 g / mol and a styrene content of 33% by weight, 30 parts by weight of tackifying resin, 40 parts by weight of process oil, and 10 parts by weight of polypropylene nonwoven fabric The mixture was placed in a vari mixer and mixed at a temperature of 135 ° C., which is an optimal temperature at which components other than the polypropylene nonwoven fabric was melted, was mixed for 20 minutes. Alternatively, 100 parts by weight of a linear styrene-butadiene-styrene block copolymer having a weight average molecular weight of 100,000 g / mol and a styrene content of 33% by weight, 30 parts by weight of a tackifying resin, and 40 parts by weight of the process oil were placed in a chestnut mixer. After 20 minutes of mixing at a temperature of 10 parts by weight of a polypropylene nonwoven fabric, the mixture was further mixed. The mixed mixture was passed through an extruder having a L / D of 6 at a temperature of 135 ° C., which is the same as that of the Bambari mixer, and a pellet modifier having a diameter of about 2 to 3 mm was prepared using an under water cutter.

8% by weight of the asphalt modifier prepared above was added to asphalt (AP5) having a penetration rate (25 ° C., 100 g, 5 seconds, 0.1 mm) of 70 ° C., a softening point of 50 ° C., and PG 64-22. And melt-mixing at 3,000 rpm to produce a modified asphalt. In this case, the time at which the modifier is dissolved and the PG test results of the modified asphalt are shown in Table 3.

(2) Example  2 to 6

In the same manner as in Example 1, a modifier was prepared according to the composition ratios shown in Table 1. The processing temperature at the time of preparation of the modifier was the optimum temperature at which components other than the polypropylene nonwoven fabric were melted.

8% by weight of the asphalt modifier prepared above was introduced into asphalt (AP5) having a penetration rate (25 ° C., 100 g, 5 seconds, 0.1 mm) of 70 ° C. and a softening point of 50 ° C., at 3,000 rpm. Melt mixing to produce modified asphalt. In this case, the time at which the modifier is dissolved and the PG grade determination result of the modified asphalt are shown in Table 3.

(3) Comparative Example  1 to 6

In the same manner as in Example 1, a modifier was prepared according to the composition ratios shown in Table 1. In Comparative Examples 1 to 4, the processing temperature at the time of preparation of the modifier was an optimum temperature at which the remaining components were melted except for polypropylene nonwoven fabric or pellet-shaped polypropylene. Comparative Example 6 was carried out by artificially adjusting the processing temperature to 170 ℃ to completely melt the polypropylene nonwoven fabric.

8% by weight of the asphalt modifier prepared above was introduced into asphalt (AP5) having a penetration rate (25 ° C., 100 g, 5 seconds, 0.1 mm) of 70 ° C. and a softening point of 50 ° C., at 3,000 rpm. Melt mixing to produce modified asphalt. In this case, the time at which the modifier is dissolved and the PG grade determination result of the modified asphalt are shown in Table 4.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Optimum mixing temperature 135 ℃ 137 ℃ 140 ° C 135 ℃ 135 ℃ 140 ° C Modifier
Composition SBS 1 100 100 100 100 SBS 2 100 100 Tackifying Resin (phr) 30 30 30 30 30 30 Process oil
(phr) 40 40 40 60 40 40 PP nonwoven (phr) 10 20 30 20 10 20

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Optimum mixing temperature 135 ℃ 156 ℃ 162 ℃ 125 ℃ 142 ℃ 170 ℃ Modifier
Composition SBS 1 100 100 100 100 100 SBS 3 100 Tackifying Resin (phr) 30 30 30 30 30 30 Process oil
(phr) 40 10 40 40 40 40 PP nonwoven (phr) 0 10 10 40 10 PP (phr) 10

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Dissolution time (min) 40min 30min 20min 25min 45min 32min PG rating PG 76-22 PG 76-22 PG 82-22 PG 76-22 PG 82-22 PG 82-22 RTFO DSR
G * / sinδ (KPa) 76 ℃ 2.9 3.3 4.3 3.0 4.2 4.8 82 ° C 1.5 1.9 2.3 1.8 2.3 2.7

* PG rating of AP5 is PG 64-22

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Dissolution time (min) 75 min 65 min 85 min 65 min 17min 60min PG rating PG 70-22 PG 76-22 PG 82-22 PG 76-22 PG 82-16 PG 76-22 RTFO DSR
G * / sinδ (KPa) 76 ℃ 2.1 3.4 4.9 3.0 4.8 2.9 82 ° C 1.1 2.0 2.7 1.5 2.5 1.5

* PG rating of AP5 is PG 64-22

* Comparative Example 5 is not good pellet state due to heavy equipment load

1 is a specimen photograph of 0.2 mm thickness formed by pressing the modifiers of Example 1 and Comparative Example 6 at 120 ° C., respectively, showing the state of the polypropylene nonwoven fabric present in the modifier. In Example 1, the polypropylene nonwoven fabric was dispersed without melting to show an opaque state, whereas in Comparative Example 6, the polypropylene nonwoven fabric was melted and semitransparent.

From Tables 3 and 4, in the case of the embodiment using the modifier in which the polypropylene nonwoven fabric according to the present invention is dispersed, Comparative Example 1 using a modifier in which the rate of dissolution of the modifier to asphalt is not included in the production of asphalt concrete And it can be seen that the increase compared to 2.

Specifically, Examples 1 to 3, when compared with Comparative Example 1 that does not include a polypropylene nonwoven fabric, the dissolution rate of the modifier during the manufacture of asphalt concrete significantly increased according to the presence or absence of the polypropylene nonwoven fabric. In addition, in Examples 1 to 3, it was confirmed that as the amount of polypropylene nonwoven fabric included in the modifier increases, the dissolution rate of the modifier increases during asphalt concrete production.

In addition, in Example 1, in which the polypropylene nonwoven fabric is not melted and dispersed in the modifier because the composition ratio is the same but the processing temperature is low, compared to Comparative Example 6 in which the polypropylene nonwoven fabric is melted in the modifier, the processing temperature is artificially increased. It can be seen that the polypropylene nonwoven fabric is present in a dispersed state without melting, which significantly increases the dissolution rate of the modifier during asphalt concrete production.

In addition, it can be seen from Example 1 and Comparative Example 4 that there is a difference in the dissolution rate of the modifier during asphalt concrete production according to the polypropylene shape distributed in the modifier. Example 1, Example 5 and Comparative Example 3 shows that the molecular weight of the styrene-butadiene-styrene block copolymer also affects the processing temperature, there is a difference in the dissolution rate of the modifier when producing asphalt concrete.

In addition, it can be seen through Examples 1 to 3 and Comparative Example 1 that the polypropylene nonwoven fabric dispersed in the modifier improves the dissolution rate of the modifier during asphalt concrete production, and the asphalt concrete produced may have a high common grade. .

Claims (16)

Iii) 100 parts by weight of styrene-butadiene-styrene block copolymer,
Ii) aromatic hydrocarbon petroleum resin, aliphatic hydrocarbon petroleum resin, dicyclopentadiene petroleum resin, polybutene, coumarone-indene resin, polyterpene resin, terpene phenol resin, rosin, rosin ester, and hydrogenated additives thereof 5 to 60 parts by weight of one or more tackifying resins selected from the group consisting of,
Iii) 20 to 80 parts by weight of process oil, and
Iii) 5 to 35 parts by weight of a polypropylene nonwoven fabric,
(Iii) the polypropylene nonwoven fabric is dispersed in a molten mixture of (iv) styrene-butadiene-styrene block copolymer, (ii) tackifying resin and (iii) process oil.
Dry asphalt modifier.
The method of claim 1,
Iii) the styrene-butadiene-styrene block copolymer is a linear or branched copolymer having a styrene content of 25 to 40% by weight and a weight average molecular weight in the range of 80,000 to 250,000 g / mol.
Dry asphalt modifier. The method of claim 1,
Said ii) tackifying resin is an aromatic hydrocarbon petroleum resin having a softening point of 70 ~ 170 ℃
Dry asphalt modifier.
The method of claim 1,
Iii) the process oil is selected from the group consisting of aromatic process oils, paraffinic process oils and mixtures thereof.
Dry asphalt modifier.
The method of claim 1,
Iii) the polypropylene nonwoven fabric is characterized in that it is manufactured using short polypropylene fibers
Dry asphalt modifier.
5. The method of claim 4,
The short polypropylene fiber is characterized in that the melting temperature is 146 ~ 170 ℃
Dry asphalt modifier.
The method of claim 1,
(Iii) the polypropylene nonwoven fabric has a thickness in the range of 0.1 to 10 mm.
Dry asphalt modifier.
The method of claim 1,
The dry asphalt modifier is characterized in that the pellet form
Dry asphalt modifier.
The method of claim 1,
It further comprises one or more additives selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants
Dry asphalt modifier.
Iii) Aromatic hydrocarbon petroleum resin, aliphatic hydrocarbon petroleum resin, dicyclopentadiene petroleum resin, polybutene, coumarone-indene resin, polyterpene resin, terpene based on 100 parts by weight of styrene-butadiene-styrene block copolymer Melt mixing 5 to 60 parts by weight of one or more tackifying resins selected from the group consisting of phenol resins, rosin, rosin esters, and hydrogenated additives thereof and 20 to 80 parts by weight of the process oil; And
Ii) dispersing 5 to 35 parts by weight of polypropylene nonwoven with respect to 100 parts by weight of the styrene-butadiene-styrene block copolymer in the molten mixture of vi)
Process for preparing dry asphalt modifier.
The method of claim 10,
Steps iii) and ii) are performed at a temperature of 110 to 145 ° C.
Process for preparing dry asphalt modifier.
The method of claim 10,
After step ii),
Cooling the mixture; And
Molding the cooled mixture into pellets;
Process for preparing dry asphalt modifier.
The method of claim 10,
In the step iii), further comprising mixing at least one additive selected from the group consisting of antioxidants, heat stabilizers, antistatic agents and lubricants
Process for preparing dry asphalt modifier.
The method of claim 10,
The polypropylene nonwoven fabric is characterized in that manufactured using short polypropylene fibers
Process for preparing dry asphalt modifier.
15. The method of claim 14,
The short polypropylene fiber is characterized in that the melting temperature is 146 ~ 170 ℃
Process for preparing dry asphalt modifier.
15. The method of claim 14,
The polypropylene nonwoven fabric is characterized in that the thickness is in the range of 0.1 to 10 mm
Process for preparing dry asphalt modifier.

Images