KR20090039293A - Modified asphalt composition used in treated fine waste tire powder with the propylene wax - Google Patents

Abstract

A method for manufacturing fine waste tire powder modified with propylene wax and a manufacturing method of modified asphalt using the modified fine waste tire powder are provided to offer environment-friendly function with a wide ripple effect of whole recycling industry by performing recycle of the waste materials with the fine waste tire powder. A composition of waste tire powder modified with propylene wax includes a propylene wax mixture and fine waste tire powder. The propylene wax mixture and fine waste tire powder are mixed with a ratio of 1:1 or 1:5 on the basis of weight. The propylene wax mixture includes propylene wax mixture of 2~20 weight% on the basis of total amount of the fine waste tire powder and aromatic process oil on the basis of weight of propylene wax with a ration of 1:1 or 1:5.

Description

Process for producing fine waste tire powder modified with propylene wax and process for producing modified asphalt using modified fine waste tire powder {modified asphalt composition used in treated fine waste tire powder with the propylene wax}

The present invention is after stirring and mixing 2 to 20% by weight of propylene wax with aromatic process oil (1: 1 to 1: 5 ratio by weight of propylene wax) based on the total amount, 80 to 98% by weight based on the total amount Added to the fine waste tire powder and modified, 5-15% by weight of fine waste tire (80mesh) modified with propylene wax, 85-90% by weight of straight asphalt (AP-5), 1-3% by weight of SBS, activated It relates to a method for producing fine waste tire powder modified with propylene wax consisting of 0.1 to 3.0% by weight and a method for producing modified asphalt using the modified fine waste tire powder.

Asphalt is an important material for road paving. Mixing of straight asphalt consists of approximately 94-96% aggregate and 4-6% asphalt binder. Such straight asphalt is likely to cause plastic deformation and cracking due to climate change. Straight asphalt has a low road pavement cost, but has a high maintenance cost.

Many efforts have been made to improve road durability. Materials such as polyethylene, glass powder, and fine sand have been added to asphalt to improve road durability. The use of these materials and their ineffective aspects are well known and have been published in the literature.

The foregoing techniques fail to show the differentiation between the problems related to plastic deformation, elongation, tensile strength, elasticity and adhesion, which are related to the polymer properties of asphalt binders for road paving. And plastic road deformation due to the impact associated with the aggregate after the pavement, problems arise that the durability is not good.

Styrene-butadiene-sstyrene (SBS) rubber has been added to the asphalt for road paving. The addition of styrene-butadiene-styrene (SBS) rubber to asphalt improved the crack resistance and resistance to plastic deformation. However, the addition of styrene-butadiene-styrene (SBS) rubber was not satisfactory for improving the performance of polymer modified asphalt against plastic deformation by impact after pavement. In the case of polymer modified asphalt, there is a problem in that storage stability such as gel formation due to excessive reactivity between the crosslinking agent and the polymer is somewhat lowered, such as precipitation in asphalt. In addition, polymer modified asphalt is not only environmentally expensive due to its high manufacturing cost, but also does not contain any recycled materials.

Attempts have been made to add waste tire powder to straight asphalt. Generally, it consists of approximately 70% of straight asphalt and 30% of waste tire powder. Waste tire powder modified asphalt is not only environmentally friendly, but also has excellent resistance to plastic deformation due to impact after pavement. However, the waste tire powder-modified asphalt not only has poor adhesive strength with aggregate, but also has problems of high temperature plastic deformation and poor crack resistance. In addition, the interaction between the waste tire powder and the asphalt was low, resulting in separation from each other, resulting in poor storage stability. In addition, when the waste tire powder and asphalt are mixed, the viscosity is too high, making it difficult to pave the road, there was a problem that must be mixed at a high temperature of 200 ℃ or more.

The addition of waste tire powder to asphalt has not been satisfactory due to three major drawbacks: Firstly, the waste tire powder is swelled during processing to reduce aggregate enhancement properties, one of its desired properties. Second, waste tire powder with a large surface area absorbs the asphalt and reduces the asphalt's ability to bind aggregates. Third, if the size of the waste tire powder is too large, the viscosity of the asphalt becomes high, making it difficult to process, causing a problem that the mixing with the aggregate is not easy.

Korean Patent Registration No. 10-479194 discloses a fouling resistance composition composed of synthetic rubber latex, hard polymer, emulsifier, asphalt, pigment, modified silicone resin emulsion, paraffin wax compound, stain resistant resin, dispersant, ion exchange water and thickener. Color modified asphalt mortar admixture having a

Publication No. 10-563005 discloses radial styrene-butadiene-styrene mixed base resins, tackifying resins, graft polymerized ethylene-A-olefin copolymers, styrene-acrylonitrile resins, and ethylene-vinylacetate resins. Asphalt modifiers, asphalt and aggregates composed of 1wqhd or more resins, mineral process oils, liquid resins and liquid butadiene rubbers, polybutenes, polyisobutylenes, substituted functional groups selected from polar functional oils, and processing aids selected from fatty oils. Asphalt mixtures containing high viscosity drainage asphalt modifiers are described,

Korean Patent Publication No. 10-462405 discloses a modified asphalt mixture of waste tire rubber powder composed of asphalt, waste tire powder, gilsonite resin, and gilsonite resin, and a manufacturing method thereof, and a method of producing asphalt concrete using the same. There is,

Korean Patent Publication No. 10-651350 describes a modified asphalt composition composed of modified asphalt of asphalt, petroleum pitch, natural asphalt gilsonite, and a method for preparing an asphalt mixture using the same.

Publication No. 10-711270 discloses a modified asphalt containing a styrene-butadiene-styrene block copolymer modified with a polymer block polymer as butadiene, a conjugated diene monomer composed of a polymer block made of an aromatic vinyl monomer and a conjugated diene polymer. Compositions are described,

Publication No. 10-639893 discloses a modified asphalt composition comprising a styrene-butadiene copolymer having an asymmetrical styrene block comprising an asymmetrical styrene block composed of a modified asphalt composition to which a conventional asymmetric linear triblock copolymer is added. Asphalt compositions containing styrene-butadiene-styreneblock copolymers are described.

The present invention is to reduce the amount of styrene-butadiene- styrene (SBS) in the polymer-modified asphalt and to reduce the generation of gel by using a fine waste tire powder (80mesh) modified with propylene wax to improve the storage stability and at the same time, fine waste Physical and chemical bonds between the tire powder (80 mesh) and asphalt were induced to reduce the separation, thereby improving plastic deformation and crack resistance. In addition, by improving the rheological properties, the effect of suppressing the noise generated when the vehicle is on the road is also improved.

In the present invention, a method for modifying fine waste tire powder with propylene wax, homogeneously dispersing the modified fine waste tire powder on asphalt, and inducing physical and chemical bonds to improve plastic deformation and crack resistance and improve storage stability It is an important technique to do.

The fine waste tire powder used in the present invention is modified to finely disperse the fine waste tire powder using propylene wax in order to disperse homogeneously in the asphalt, thereby giving the slippage characteristics of the polymers in the fine waste tire powder, thereby improving the dispersing characteristics and storing. Stability can be secured. In order to induce physico-chemical bonds between fine waste tire powder and asphalt, appropriate activators can be used to reduce the mutual separation. Since the activator is partially used to impart interaction force between fine waste tire powder and asphalt before the gelation of styrene-butadiene-styrene (SBS) occurs, excessive reaction can be suppressed to prevent gelation. have. By adding a compatibilizer to the fine waste tire powder, the additives in the fine waste tire powder may be extracted to enhance the binding force between the fine waste tire powder and the asphalt. By expressing all these properties, it is possible to improve plastic deformation, crack resistance, storage stability, elongation, tensile strength, elastic properties, and adhesion in the case of road pavement.

The present invention relates to a method for producing fine waste tire powder modified with propylene wax and a method for producing modified asphalt using the modified fine waste tire powder. The production of modified asphalt at a relatively low temperature reduces the occurrence of odor, thereby improving the working environment. I think you can expect the effect. In addition, since fine waste tire powder is used, the recycling of waste materials is expected, so the ripple effect of the entire recycling industry is very high and environmentally friendly products.

The present invention provides a method for producing fine waste tire powder modified with propylene wax and a method for producing modified asphalt using the modified fine waste tire powder, and has excellent storage stability due to excellent dispersion characteristics in fine waste tire powder and asphalt. After road pavement, plastic deformation, crack resistance, storage stability, elongation, tensile strength, elastic properties, and adhesion are greatly improved. Therefore, the maintenance cost after pavement can be expected to be reduced.

Since the manufacture of the modified asphalt using the fine waste tire powder modified with propylene wax of the present invention at a low temperature of less than 180 ℃, it is possible to reduce the manufacturing cost and contribute to securing the price competitiveness.

In the case of producing modified asphalt using fine waste tire powder modified with propylene wax in the manufacturing process of the present invention, since the viscosity is lower than 2.0 poise, it is easy to mix with aggregate during road pavement, thereby greatly improving workability. think.

The present invention relates to a method for producing fine waste tire powder modified with propylene wax and a method for producing modified asphalt using the modified fine waste tire powder, and fine waste tire by physical and chemical bonding between asphalt and fine waste tire powder. It is not only excellent in storage stability by reducing the separation phenomenon between the powder and asphalt, it is characterized by improved mechanical and rheological properties compared to straight asphalt. In the manufacturing process, the production temperature is characterized by mixing and dispersing at 180 ° C. or less, more preferably at 170 ° C.

The greatest characteristic of the present invention is that the fine waste tire powder is modified with propylene wax and used for asphalt, so that the fine waste tire powder in the modified asphalt is uniformly dispersed, which has excellent storage stability and low viscosity.

Modified asphalt using fine waste tire powder modified with propylene wax of the present invention is produced in a free mixer type.

When the fine waste tire powder is modified with propylene wax, the slippage characteristics of the polymers in the fine waste tire powder are expressed, thereby improving the dispersion property, thereby improving storage stability. As a method of modifying the fine waste tire powder with propylene wax, propylene wax is used in an amount of 2 to 20% by weight, more preferably 8 to 15% by weight based on the total amount. Aromatic process oils are used at a ratio of 1: 1 to 1: 5 based on the amount of propylene wax and dissolved by stirring at a temperature of 60 ° C. for 1 to 2 hours. Dissolved propylene wax is mixed with 80 to 98% by weight of fine waste tire powder based on the total amount and stirred and mixed for about 2 hours to modify the fine waste tire powder. When the amount of propylene wax used is less than 2% by weight, the slipperiness of the fine waste tire powder is poor, and the storage stability is inferior, and when the amount of the propylene wax used is 20% by weight or more, the price increases. In addition, the aromatic process oil acts as a compatibilizer to extract additives in the fine waste tire powder to enhance the binding force between the fine waste tire powder and the asphalt, as well as to improve the miscibility between the asphalt and the fine waste tire powder. In charge.

Styrene-butadiene-sstyrene (SBS) rubber has the function of causing physical bonding with asphalt. If the styrene-butadiene-styrene (SBS) rubber is subjected to excessive reaction by excessive use of an activator, such physical bonding is unlikely to occur. Because physical bonding is caused by high molecular weight entanglement, the higher the crosslinking density, the narrower the gap between styrene-butadiene-styrene (SBS) and the lower the probability of causing physical bonding with asphalt. As for the usage-amount of the styrene-butadiene- styrene (SBS) rubber in this invention, it is preferable to use 1-3 weight% on a total basis.

Asphalt exists in the solid or semi-solid state at room temperature, but has the property of melting and liquefaction upon heating. In the present invention, a modified asphalt composition was prepared using AP-5 (penetration degree 60 to 80, S-OIL product). Use amount is 85 to 90% by weight of the total amount.

The activator not only increases the interaction force between asphalt and fine waste tire powder, but also plays a role in enhancing the bond between styrene-butadiene-styrene (SBS) rubber. A suitable amount of 0.1 to 3.0% by weight is used. If the amount is less than 0.1% by weight, the role of promoting the bonding between the styrene-butadiene-styrene (SBS) rubber becomes worse, and if the amount is more than 3.0% by weight, the styrene-butadiene- Excessive bonding between styrene (SBS) rubbers results in the formation of gels and poor storage stability.

In asphalt production, the raw materials used are manufactured at a low temperature of 170 ° C. or less using fine waste tire powder (80mesh) modified with propylene wax while the asphalt is heated and melted at 170 ° C. in advance to maintain a solution state. It is possible to reduce the deterioration phenomenon of these can express a stable characteristic. Moreover, it has a characteristic which can maintain 2 poises or less in a viscosity characteristic, and can make road paving work easy.

Example 1

First step (production of modified fine waste tire powder)

20 g of propylene wax and 80 g of aromatic process oil were placed in a 200 ml container, heated to 80 degrees, and stirred and mixed for about 2 hours to dissolve 16 g of mixed propylene wax mixed solution and 144 g of fine waste tire powder in a 300 ml container to uniformly mix for about 1 hour. To prepare fine waste tire powder (A-1) modified with propylene wax,

Second Process (Manufacture of Modified Asphalt)

Asphalt AP-5 grade asphalt (S-OIL product) 2kg was put in a hot air dryer to melt at 160 ℃ to have fluidity, it was put into a 3 liter reactor with a heating mantle attached. After heating to 170 ° C, 160g of fine waste tire powder (A-1) modified with propylene wax prepared in the first step is added and homogeneously mixed at 170 ° C for about 2 hours. 40 g of styrene-butadiene-styrene (SBS) rubber was added thereto, followed by homogeneous mixing at 170 ° C. for about 2 hours, and 20 g of activator was added to mix for about 1 hour to prepare modified asphalt.

Example 2

First step (production of modified fine waste tire powder )

20 g of propylene wax and 80 g of aromatic process oil were placed in a 200 ml container, heated to 80 ° C., stirred and mixed for about 2 hours, and 16 g of propylene wax mixed solution and 144 g of fine waste tire powder were mixed in a 300 ml container and uniformly mixed for about 1 hour. Prepared and prepared fine waste tire powder (A-2) modified with propylene wax,

Second process (production of modified asphalt)

Asphalt AP-5 grade asphalt (S-OIL product) was put into a hot air dryer to melt at 160 ° C to have fluidity, and then put into a 3 liter reactor equipped with a heating mantle, followed by heating to 170 ° C. After adding 160 g of fine waste tire powder (A-2) modified with propylene wax prepared in the process and homogeneously mixing at 170 ° C. for about 2 hours, 40 g of styrene-butadiene-styrene (SBS) rubber was added at 170 ° C. After homogeneous mixing for about 2 hours, 20 g of an activator was added and mixed for about 1 hour to prepare modified asphalt.

The fine waste tire powder (80mesh) modified with the propylene wax prepared as described above is composed of the propylene wax mixed solution and the fine waste tire powder in a ratio of 1: 1 to 1: 5 by weight,

It can be seen that the propylene wax mixed solution is composed of propylene wax of 2 to 20% by weight based on the total amount of fine waste tire powder and aromatic process oil in a ratio of 1: 1 to 1: 5 based on the propylene wax weight. have.

The composition of the modified asphalt using fine waste tire powder modified with propylene wax is 5 to 15 wt% of fine waste tire powder (80mesh) modified with propylene wax, 85 to 90 wt% of straight asphalt (AP-5), styrene- Butadiene- styrene (SBS) It can be seen that the composition is composed of 1 to 3% by weight of rubber, 0.1 to 3.0% by weight of the activator.

Experimental Example 1

The result of measuring the PG grade of the modified asphalt using fine waste tire powder modified with propylene wax prepared in Example 1 is shown.

A certain amount of samples were taken and measured at 135 degrees with a Brookfield viscometer and the viscosity was 1.72 poise.

PG Grade measurement result

     Item temperature DSR ¹ Original G * / sinδ RTFO ² G * / sinδ BBR ³ stiffness m-Value 76 ℃ 1.34 2.24 - - -12 ℃ - - 190 0.340 Test Methods AASHTO TP5 AASHTO TP5 AASHTO TP1 AASHTO TP1 PG Class 76-22 Standard 1.0 kPa or more 2.2 kPa or more 300 MPa or less 0.3 or more PG grade 76-22 passed

1. Dynamic Shear Rheometer (DSR): Investigation of asphalt characteristics at high temperature

2. RFTO (Rolling Thin Film Oven): Investigate the deterioration characteristics of asphalt

3. BBR (Bending Beam Rheometer): Investigation of asphalt characteristics at low temperature

Experimental Example 2

    The result of measuring the PG grade of the modified asphalt using fine waste tire powder modified with propylene wax prepared in Example 2 is shown.

   A certain amount of samples were taken and measured at 135 degrees with a Brookfield viscometer and the viscosity was 1.70 poise.

 PG grade measurement result

     Item temperature DSR ¹ Original G * / sinδ RTFO ² G * / sinδ BBR ³ stiffness m-Value 76 ℃ 1.34 2.24 - - -12 ℃ - - 190 0.340 Test Methods AASHTO TP5 AASHTO TP5 AASHTO TP1 AASHTO TP1 PG Class 76-22 Standard 1.0 kPa or more 2.2 kPa or more 300 MPa or less 0.3 or more PG grade 76-22 passed

Claims (3)

In the manufacturing method of fine waste tire powder modified with propylene wax, 1 to 20 wt% of propylene wax and 80 to 98 wt% of aromatic process oil were mixed by stirring and dissolving the mixed propylene wax mixed solution and fine waste tire powder for 1 hour by weight. Method for producing a fine waste tire powder modified with propylene wax, characterized in that by mixing in a container with a ratio of 1: 5 to 1 hour and stirred at 80 ℃. In the composition of the fine waste tire powder modified with propylene wax, Propylene wax mixed solution and fine waste tire powder are composed of 1: 1 to 1: 5 ratio by weight, The propylene wax mixed solution is composed of propylene wax of 2 to 20% by weight based on the total amount of fine waste tire powder and aromatic process oil in a ratio of 1: 1 to 1: 5 based on the propylene wax weight. A composition of fine waste tire powder modified with propylene wax. In the manufacturing method of modified asphalt using fine waste tire powder modified with propylene wax, 1 to 20 wt% of propylene wax and 80 to 98 wt% of aromatic process oil were mixed by stirring and dissolving the mixed propylene wax mixed solution and fine waste tire powder for 1 hour by weight. To 1: 5 ratio into a container and stirred and mixed at 80 ℃ for 1 hour to prepare a fine waste tire powder (A-1) modified with propylene wax, Asphalt AP-5 grade asphalt (S-OIL product) 85 ~ 90% by weight is put in a hot air dryer to melt at 160 ℃ to have fluidity, and then put into a 3 liter reactor equipped with a heating mantle and heated to 170 ℃. Then, 5-15 wt% of the fine waste tire powder (A-1) modified with propylene wax was added thereto, followed by homogeneous mixing at 170 ° C. for 2 hours. Propylene, characterized in that 1 to 3% by weight of styrene-butadiene-styrene (SBS) rubber is added and homogenously mixed at 170 ° C. for 2 hours, and then mixed with 0.1 to 3.0% by weight of activator for 1 hour. Method for producing modified asphalt using fine waste tire powder modified with wax.