KR100986718B1 - Modified asphalt composition used in treated fine waste EPDM powder - Google Patents

Abstract

The present invention is based on the total amount of fine waste EDM (EPDM) powder (30 ~ 200 mesh) 1 ~ 15% by weight, straight asphalt (AP-5) 80 ~ 90% by weight, styrene-butadiene- styrene (SBS) rubber It relates to a method for producing asphalt modified with fine waste EDM (EPDM) powder (30 to 200 mesh) consisting of 1 to 4% by weight, 0.5 to 10% by weight of process oil, and 0.2 to 3.0% by weight of activator.

Modified asphalt. Fine lung EPDM powder. Process oil

Description

Modified asphalt composition used in treated fine waste EPDM powder

The present invention is fine waste EDM (EPDM) powder (hereinafter referred to as "waste EPDM powder") based on the total amount (30 ~ 200 mesh) 1 ~ 15% by weight, straight asphalt (AP-5) 80 ~ 90% by weight , Styrene-butadiene-Styrene (SBS) rubber 1 to 4% by weight, process oil 0.5 to 10% by weight, and relates to a method for producing modified asphalt modified with fine waste EPDM powder consisting of 0.2 to 3.0% by weight of activator. .

With the recent development of the automobile industry, developed countries and Korea have established a recovery rate of nearly 100% by law to recover and recycle materials in automobiles, such as metals, non-metals, plastics, and rubbers, at the end of their lifetime. Worry is deepening. Among these materials, EPDM (hereinafter referred to as “EPDM”) used for weather strips and hoses generates a large amount of waste EPDM, which is still insufficient to recover and recycle it. It can be expected to be a demand source for new recycling of waste EPDM by using modified asphalt as a modifier in asphalt production.

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 construction cost, the maintenance cost is high.

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 previous techniques failed to show the differentiation between the problems related to plastic deformation, elongation, tensile strength, elastic recovery 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 is composed 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 is not only a simple dispersion effect, but also has poor adhesive strength with aggregates, and also has problems such as poor high temperature plastic deformation and 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 exchanged 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 at least one resin selected from mineral processing oils, liquid resins and liquid butadiene rubbers, polybutenes, polyisobutylenes, oils substituted with polar functional groups, and processing aids selected from fatty oils. Asphalt mixtures containing high viscosity drainage asphalt modifiers composed of

In Korean Patent Publication No. 10-1998-082220, the modifier is ethylene vinyl acetate (EVA), atactic polypropylene (APP), polyethylene (PE), styrene-butadiene rubber (SBR), styrene-butadiene-styrene block Modified asphalt solids selected from copolymers (SBS), styrene-ethylene-butadiene-styrene (SEBS) and ethylene-propylene-diene monomers (EPDM) are disclosed,

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 method for producing the asphalt concrete using the same. And

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 producing an asphalt mixture using the same,

Korean Patent Publication No. 10-0291581 relates to additives for asphalt pavement and mixtures thereof. In particular, additives obtained by mixing asphalt with cellulose fibers and polymer compounds (SBS, SBR, EVA, EPDM, PE, etc.) are used for asphalt, aggregate and stone powder. Asphalt pavement additives and mixtures that can minimize the plastic deformation of the asphalt surface by increasing the resistance to plastic deformation and inducing the delay of cracking by mixing together aggregates when the asphalt mixtures are ideally composed. Has been written about,

Publication No. 10-711270 describes 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 conjugated diene polymer and a polymer block made of an aromatic vinyl monomer. Compositions are described,

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

The present invention reduces the amount of styrene-butadiene-styrene (SBS) in polymer-modified asphalt and expresses the sliding property between asphalt and fine waste EPDM powder (30-200 mesh) using process oil, and has a high shear force and strong stirring. It improves the dispersing characteristics and improves the storage stability, and at the same time induces physical and chemical bonds between the fine waste EPDM powder (30 ~ 200 mesh) and asphalt to reduce the separation between each other, thereby improving plastic deformation and crack resistance. . In addition, the asphalt modified with waste EPDM powder (30 ~ 200 mesh) has improved the adhesive strength with aggregates by improving the rheological properties such as viscoelastic properties, elastic recovery force, etc. The effect of suppressing noise is also improved.

In the present invention, Korean Patent Application No. 10-2006-0075067, Name of the invention; Waterproof paper using asphalt modified with waste tire rubber powder and its manufacturing method and modified asphalt, as well as dispersing fine waste EPDM powder (30 ~ 200 mesh) in asphalt homogeneously and plastic deformation by inducing physical and chemical bonds Improving over-crack resistance and improving storage stability are important techniques.

The fine waste EPDM powder (30 to 200 mesh) used in the present invention may use a process oil to homogeneously disperse in asphalt, and induce a homogeneous dispersion by passing a stirrer of high shear force together with the improvement of the sliding characteristics of each other. In addition, it is possible to reduce the mutual separation by using an appropriate activator to induce physical and chemical bonding between the fine waste EPDM powder and asphalt. Since the activator is partially used to impart interaction force between the fine waste EPDM powder and asphalt before the gelation of styrene-butadiene-styrene (SBS) occurs, excessive reaction can be suppressed to prevent the gelation phenomenon. have. By expressing all these properties, it is possible to improve plastic deformation, crack resistance, storage stability, elongation, tensile strength, elastic recovery and adhesion in the case of road pavement.

The present invention relates to a method for producing asphalt modified with fine waste EPDM powder (30 to 200 mesh). By producing modified asphalt at a relatively low temperature, odor is less likely to be expected to improve the working environment. And since the use of fine waste EPDM powder (30 ~ 200 mesh) is expected to recycle the waste materials, the ripple effect of the entire recycling industry is not only very high but also environmentally friendly.

The present invention provides a method for producing modified asphalt using fine waste EPDM powders (30 to 200 mesh), which provides slip characteristics between fine waste EPDM powders and asphalt by use of process oil, and by stirring and mixing by high shear force. Its excellent dispersion stability makes it excellent in storage stability. After road pavement, plastic deformation, crack resistance, storage stability, elongation, tensile strength, elastic recovery and adhesion are greatly improved. Therefore, the life expectancy of road pavement after road pavement can be improved and maintenance cost can be expected to be reduced.

When manufacturing asphalt modified with fine waste EPDM powder (30 ~ 200 mesh) of the present invention because it is manufactured at a low temperature of less than 175 ℃, it can reduce the manufacturing cost can contribute to securing the price competitiveness.

When the asphalt modified with fine waste EPDM powder (30-200 mesh) is manufactured by 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. I think.

The present invention relates to a method for producing modified asphalt modified with fine waste EPDM powder (30-200 mesh), and the separation between the fine waste EPDM powder and asphalt by physical and chemical bonding between asphalt and fine waste EPDM powder. It is characterized by lowering not only excellent storage stability but also improved mechanical and rheological properties compared to straight asphalt. And it is characterized by having a low viscosity while mixing and dispersing the production temperature in the manufacturing process at 175 ℃ or less, more preferably 160 ~ 170 ℃.

Modified asphalt using the fine waste EPDM powder (30 ~ 200 mesh) of the present invention is produced in a free mixer type. The process oil is used to generate the sliding characteristics between the asphalt and the fine waste EPDM powder, and at the same time, the fine waste EPDM powder (30 ~ 200 mesh) is used by the high shear force stirrer to improve the dispersion characteristics by the strong stirring force. Can improve.

Fine waste EPDM powder can be used in the powder of 30 ~ 200 mesh size, the finer the powder size, the more specific surface area, the greater the interaction force with the asphalt, it shows excellent rheological properties. The amount of waste EPDM powder is 1 to 15% by weight, but more preferably 5 to 13% by weight. When used below 1% by weight, rheological properties such as viscoelastic properties and elastic recovery are hardly expressed, and when used above 15% by weight, the viscosity rises too much when mixed with asphalt, resulting in a significant decrease in agitation mixing and paving properties. .

Process oil plays a role in improving the compatibility with each other by generating a slip characteristic between asphalt and fine waste EPDM powder. Process oils can be classified into paraffinic, naphthalene and aromatic, but any may be used. The amount of process oil used is preferably 0.5 to 10% by weight. When 0.5% by weight or less is used, it is difficult to express slip characteristics between the fine waste EPDM powder and asphalt, and when 10% by weight or more is used, durability decreases due to excessive use, resulting in poor plastic deformation characteristics.

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 1-4 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). The amount used is 80 to 90% by weight of the total amount.

The activator is any one compound selected from polyethylene resin, polypropylene resin, acrylic resin, epoxy resin or two or more compounds, and not only increases the interaction force between asphalt and fine waste tire powder, but also styrene-butadiene It plays a role in promoting the bond between 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.

Asphalt is manufactured in the low temperature of 170 ℃ or less using fine waste EPDM powder (30 ~ 200 mesh) while maintaining the solution state by melting asphalt by heating 160 ~ 170 ℃ in advance. Degradation can be reduced and stable characteristics can be expressed. In addition, it is possible to maintain 2 poises or less in the viscosity characteristic, which makes it easy to pave the road.

Example 1

Asphalt AP-5 grade asphalt (S-OIL product) 2.4kg was put in a hot air dryer to melt at 160 ℃ to have fluidity, it was put into a capacity 4 liter reactor with a heating mantle. After heating to 170 ° C, 0.3 kg of waste EPDM powder passed through a 50 mesh sieve and 0.12 kg of process oil (N-2, unchanged petroleum) were added and mixed homogeneously with a high shear force stirrer at 170 ° C for about 2 hours. 0.12 kg of styrene-butadiene-styrene (SBS) rubber (KTR-101, Kumho Petrochemical) was added to the mixture and homogenized at 170 ° C. for about 2 hours, and then 0.06 kg of epoxy resin was added as an activator for about 1 hour. Mixing produced a modified asphalt.

Example 2

Asphalt AP-5 grade asphalt (S-OIL product) 2.7kg was put in a hot air dryer to melt at 160 ℃ to have fluidity, it was put into a capacity 4 liter reactor with a heating mantle attached. After heating to 170 ° C, 0.15kg of waste EPDM powder passed through 80 mesh sieve and 0.03kg of process oil (N-2, unchanged petroleum) are added and homogeneously mixed at 170 ° C with a high shear force for about 2 hours. 0.11kg of styrene-butadiene-styrene (STR) rubber (KTR-101, Kumho Petrochemical) was added to the mixture and homogenized at 170 ° C for about 2 hours, and then 0.01kg of epoxy resin was added as an activator for about 1 hour. Mixing produced a modified asphalt.

The composition of the modified asphalt using the waste EPDM powder prepared as described above is 5-15 wt% of fine waste EPDM powder (30-200 mesh), 85-90 wt% of straight asphalt (AP-5), styrene-butadiene-styrene (SBS) 1 to 4% by weight of rubber, 0.5 to 10% by weight of process oil, 0.2 to 3.0% by weight of any one compound selected from polyethylene resin, polypropylene resin, acrylic resin, epoxy resin or two or more compounds as an activator It can be seen that the composition consists of.

Experimental Example 1

The results of measuring the PG grade of the modified asphalt using the fine waste EPDM powder prepared in Example 1 are shown.

A certain amount of samples were taken and measured at 135 degrees with a Brookfield viscometer and the viscosity was 1.98 poise.

PG grade measurement result

Item
Temperature DSR ¹ Original
G * / sinδ RTFO ²
G * / sinδ BBR ³ stiffness m-Value  76 ℃ 1.58 2.54 - - -12 ℃ - - 166 0.33 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 Pass 76-22

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 results of measuring the PG grade of the modified asphalt using the fine waste EPDM powder prepared in Example 1 are shown.

A certain amount of samples were taken and measured at 135 degrees with a Brookfield viscometer and the viscosity was 1.85 poise.

 PG grade measurement result

Item
Temperature DSR ¹ Original
G * / sinδ RTFO ²
G * / sinδ BBR ³ stiffness m-Value  76 ℃ 1.20 2.35 - - -12 ℃ - - 151 0.31 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 (4)

delete delete delete In the method for producing the modified asphalt, Asphalt AP-5 grade asphalt 80 ~ 90% by weight in a hot air dryer to melt at 160 ℃ to have fluidity, and then put into a reactor with a heating device heated to 160 ~ 170 ℃, 1 to 15% by weight of fine waste EPDM powder (30 to 200mesh) and 0.5 to 10% by weight of process oil were added to the stirrer with high shear force at 160 to 170 ° C for 1 to 4 hours. After homogeneous mixing, 1 to 4% by weight of styrene-butadiene-styrene (SBS) rubber was added and homogeneously mixed at 160 to 170 ° C. for about 1 to 4 hours, and then polyethylene ethylene resin, polypropylene resin, A method for producing modified asphalt in which any compound selected from acrylic resins and epoxy resins or 0.2 to 3.0% by weight of two or more compounds is added and mixed for about 0.5 to 2 hours.