KR20010079273A - Method for manufacturing and modify agent for drainage asphalt - Google Patents

Abstract

PURPOSE: A modifier for the use of drainage asphalt is provided to improve arsenate resistance, weather resistance, water resistance, fluidity resistance and strength of aggregate necessary for manufacturing drainage asphalt for pavement. CONSTITUTION: A method for manufacturing a modifier for drainage asphalt for the use of road pavement is comprised of the steps of: adding 60-65 wt.% of styrene-butadiene-styrene linear block copolymer to 10-15 wt.% of process oil and burning the mixture; adding 23-27 wt.% of adhesion promotor, 0.3-0.5 wt.% of antioxidant, and 0.1-0.3 wt.% of ultraviolet stabilizer; and extruding the resultant at the nozzle temperature of 160-180 deg.C. Preferably, styrene-butadiene-styrene copolymer is polar pellet type, having the average molecular weight at 70,000-110,000.

Description

Modifier for drainage asphalt and its manufacturing method {METHOD FOR MANUFACTURING AND MODIFY AGENT FOR DRAINAGE ASPHALT}

The present invention is a plant mix method mainly comprising a thermoplastic elastomer, styrene-butadiene-styrene copolymer, in order to improve physical properties in the manufacture of drainage asphalt for pavement with high porosity, in particular, general asphalt as a high viscosity binder for drainage pavement. The present invention relates to a modifying agent for drainable asphalt and a method for producing the same. More specifically, the thermoplastic elastomer used as the main component is a material that is difficult to be dissolved in asphalt alone, but it is easily dissolved and bonded to general asphalt even by the plant mix method by adopting the master batch method based on the components in the asphalt and the polymer blending technology. It can be reformed into high quality binders.

In general, the drainable asphalt composition is susceptible to water, air, and sunlight due to its large porosity, and thus, the physical property of the drainable asphalt composition is better than that of the conventional dense asphalt composition. That is, the drainage asphalt composition uses asphalt having a large grasp, specifically, a toughness and a large tenness to improve the scattering resistance of the aggregate, and the viscosity of the asphalt must be high so that the weather resistance is large and the film thickness can be thickened. . In addition, in order to increase water resistance, asphalt with high adhesion (peel resistance) to aggregate should be used, and the softening point and high asphalt viscosity at 60 ° C increase resistance to plastic deformation (difficult to generate wheel marks). Fluidity is improved.

On the other hand, the Cantabro loss rate test (%), which is one of the properties evaluation methods of drainage asphalt composition, is a test for evaluating the scattering resistance of aggregates. Generally, the loss rate tends to decrease as the amount of asphalt increases. In this case, the minimum asphalt amount can be obtained. In addition, the drain down test is a test for evaluating whether the asphalt sag during transportation or construction. As the amount of asphalt increases, the amount of downflow increases, and when applied to a compound design, the maximum amount of asphalt can be obtained from this result.

Based on the above, the high-viscosity modified asphalt used in the conventional drainage asphalt composition is pre-mixed by dissolving and modifying a predetermined modifier on straight asphalt in a factory in advance to transport the asphalt truck with a minimum transport volume of about 5 tons. It should be stored while heated in an asphalt tank or the like. In addition, phase separation may occur during storage, and the asphalt that has passed more than a week in the asphalt tank after manufacture cannot be used due to the deformation of physical properties, resulting in economic losses that must be discarded. In addition, it is difficult to confirm the quality of the mixing amount of the modifier and the quality cannot be adjusted during the mixing unless other modified asphalt is carried in.

Therefore, an object of the present invention for solving the problems as described above is to transport only a small amount of the modifier in a small car in the method of reforming by adding a modifier in the manufacture of drainage asphalt for road pavement, storage place and period of use If there is no restriction and increase the amount of addition, it is possible to produce a more durable drainage asphalt, and to provide a plant mix method for modifying drainage asphalt using only the required amount at all times according to the construction scale and a method of manufacturing the same.

Another object of the present invention is to manufacture the drainage asphalt for pavement pavement by the plant mix method, the container for dissolving is unnecessary, and can be applied to large-scale construction as well as large-scale construction by automatic weighing and automatic input device, asphalt The present invention provides a reformer for drainage asphalt for pavement that requires no cleaning of supply pipes, and a method of manufacturing the same.

The present invention according to the first aspect for achieving the object as described above is plasticized by adding 10 to 15% by weight of process oil to 60 to 65% by weight of styrene-butadiene-styrene linear block copolymer, and then bonded to it Modifier for drainage asphalt consisting of 25-30% by weight enhancer, 0.3-0.5% by weight antioxidant and 0.1-0.3% by weight UV stabilizer were added and mixed into the extruder and extruded at a nozzle temperature of 160-180 ° C. The manufacturing method of the.

Hereinafter, preferred embodiments of the present invention will be described in detail. It should be noted that in the following description, only parts necessary for understanding the present invention will be described, and descriptions of other parts will be omitted so as not to obscure the subject matter of the present invention.

Looking at the concept of the present invention implemented first, to improve the physical properties than the general asphalt composition (density mixture), such as splash resistance, weather resistance, water resistance, flow resistance of the drainage asphalt composition and asphalt aggregate. Namely, an aromatic hydrocarbon resin-based adhesion promoter having a softening point of 90 to 125 ° C in an elastomer mainly composed of styrene-butadiene-styrene (hereinafter referred to as "SBS") linear block copolymer having a weight average molecular weight in the range of 70,000 to 110,000, After mixing process oil, antioxidant, and ultraviolet stabilizer, the present invention proposes a method for producing drainage asphalt modifier by extrusion at nozzle temperature of 160 ° C., cooling in water, and cutting into pellets having a size of 2-3 mm.

As described above, according to the present invention, the modifier used in the drainage asphalt composition may increase the softening point and the viscosity at 60 ° C., thereby preventing the improvement of the flow resistance at high temperature and the clogging between the gaps. And based on the above-mentioned SBS copolymer, by appropriately selecting the additive type and content of the adhesion promoter and process oil, preferably paraffinic, naphthenic, aromatic, etc., the separation resistance is excellent and the elasticity and the grasp of the aggregate are large. Modifiers can be prepared, and the aggregate can also be improved in peeling, cracking and scattering resistance. In particular, by suppressing the softness at high temperature, there is no falling down of the asphalt and material separation of the mixture, less adhesion to the transport vehicle, there is an advantage of easy installation and manual use.

Meanwhile, the high viscosity modified asphalt used in the drainage asphalt composition having a porosity of about 20 to 27% so that the water penetrated into the drainage layer during rainy weather can be drained quickly to the drainage treatment facility. To make.

Table 1 Properties of high viscosity modified asphalt

Item standard Test Methods Penetration Degree (25 ℃) 1 / 10mm 40 or more JIS K 2207 Softening point (℃) 70.0 or more JIS K 2207 Elongation (15 ℃) (cm) 50 or more JIS K 2207 Flash point (℃) 260 or more JIS K 2265 Furas embrittlement shop (℃) -20 or less JIS K 2207 Thin film heating mass change rate (%) 0.6 or less JIS K 2207 Thin film heating penetration change rate (%) 65 or more JIS K 2207 Toughness (kgf / cm) More than 200 JEAAS Tennessee (kgf / cm) More than 150 JEAAS Density (15 ° C) (g / cm ² ) 1.000 or more JIS K 2207 Peeling area ratio of coarse aggregate (%) 5 or less Package Test Manual Viscosity (60 ℃) poise More than 200,000 JAA-001

※ JEAAS: Japan Emulsified Aspalt Association

JAA: Japan Aspalt Association

First, determine the total amount of modified asphalt to be produced (500 to 1,000 g is appropriate), weigh the modifier against the amount of asphalt, put it in the prepared metal container, mix the same amount of asphalt as the modifier, and heat it on the heater ( 170-180 ° C.) and knead evenly. At this time, when the modifier starts to melt and the viscosity increases and it becomes difficult to knead, the asphalt is added little by little while finally adding all of the asphalt and confirming that the modifier is uniformly kneaded on the asphalt.

In this way, by adding 11 to 13% of the modifier to the amount of asphalt and mixing the high-viscosity modified asphalt with a viscosity of 600,000 or more at 60 ° C with aggregate, sand, and filler mixture having a maximum particle diameter of about 20 to 27% The porosity of the aggregate, but also has the advantage of producing a porous pavement asphalt with better physical properties than the mixture of the density of the aggregate, such as scattering resistance, weather resistance, water resistance, flow resistance, strength of the mixture.

Hereinafter, the present invention will be described in detail based on the preferred embodiment of the present invention, but the present invention is not limited to the embodiment.

{Example 1}

After preliminary plasticization by adding 12% by weight of process oil to 63% by weight of the porous pellet-type SBS linear block copolymer having a weight average molecular weight in the range of 70,000 to 110,000, the aromatic hydrocarbon resin system having a softening point of 90 to 125 ° C. 24.5% by weight of adhesion promoter, 0.3% by weight of antioxidant, and 0.2% by weight of UV stabilizer were mixed and then placed in an extruder hopper of two-winscrew, extruded at a nozzle temperature of 160-180 ° C, preferably 170 ° C. After cooling in, it was cut again into pellets of the size of 3mm to prepare a drainage asphalt modifier, wherein the physical properties of the modifier prepared by the above-described method is shown in detail in Table 2 below.

{Table 2}

Test Items result Remarks Tensile Strength (kg / cm ² ) Tear Strength (kg / cm) Elongation Rate (%) Hardness (A-type) 200 or more 30 to 35 850 or more 77 ± 1 Rubber hardness tester

On the other hand, to apply the modifier prepared by the above method to drainage asphalt, the modifier produced by the above method in the aggregate formulation of 83%, 12% sand, 5% filler 5% of aggregate aggregate with a maximum aggregate particle diameter of 4.5% asphalt Add high viscosity modified asphalt prepared by adding 12% to the amount, and mix it in a plant mix method for 3 minutes in a mix of 180 ± 5 ℃, and then again compaction temperature (hardening temperature) of 165 ± 3 ℃ After fabrication of the specimen, the physical properties such as the Marshall test and the wheel tracking test were evaluated, which are shown in detail in Table 3 below.

{Example 2}

A high viscosity modified asphalt prepared by adding 12% of the modifier prepared in Example 1 to the aggregate amount of 5% asphalt to the aggregate blend of 86% coarse aggregate, 9% sand, and 5% filler having a maximum aggregate particle size, This was prepared in the same manner as in Example 1 to evaluate the physical properties, which are shown in detail in Table 3 below.

{Example 3}

A high viscosity modified asphalt prepared by adding 12% of the modifier prepared in Example 1 to 5.5% of the asphalt content was added to the aggregate formulation of 88% coarse aggregate, 7% sand, and 5% filler having a maximum aggregate particle size, This was prepared in the same manner as in Example 1 to evaluate the physical properties, which are shown in detail in Table 3 below.

Table 3 Properties of Drainable Asphalt with Modifiers

Test Items Example 1 Example 2 Example 3 Theoretical density (g / cm3) 2.537 2.557 2.577 Marshall test Density (g / cm 3) 2.034 2.030 2.041 Porosity (%) 21.4 19.9 21.3 Stability (KN) 3.96 5.21 4.56 Flow value (1 / 10mm) 27.0 32.7 30.7 Cantabro Loss Rate (%) 10.2 13.3 17.9 Wheel tracking Specimen density (g / cm 3) 2.038 2.021 2.038 Net high density (%) 100.2 99.6 99.9 Consolidation strain (mm) 0.4600 0.4800 0.5000 Final deformation (mm) 1.00 0.98 1.02 Dynamic Stability (times / mm) 4500 4500 4500

As described above, the present invention has an advantage that the physical properties of the mixture is better than the mixture, such as scattering resistance, weather resistance, water resistance, flow resistance, strength of the mixture, while having a porosity of about 20 to 27%.

In addition, the modifier of the present invention increases the viscosity at the softening point and 60 ℃ can prevent the flow resistance at high temperatures and clogging between the gaps, and also has excellent separation resistance and great grasp of elasticity and aggregate strength There is this.

In particular, the present invention can improve the peeling, cracking and scattering resistance of the aggregate, by suppressing softening at high temperatures, there is no falling of asphalt and material separation of the mixture, less adhesion to the transport vehicle, easy installation and manual work There is an easy synergistic effect.

Claims (5)

In the manufacturing method of drainage asphalt modifier for road pavement, 60 to 65% by weight of styrene-butadiene-styrene linear block copolymer was added to plasticize by adding 10 to 15% by weight of process oil, followed by 23 to 27% by weight of adhesion promoter, 0.3 to 0.5% by weight of antioxidant and UV stabilizer. Mixing by adding 0.1 to 0.3% by weight, and then putting it in an extruder, the extrusion process at a nozzle temperature of 160 ~ 180 ℃, characterized in that the method for producing a drainage asphalt modifier. The method of claim 1, wherein the styrene-butadiene-styrene has a weight average molecular weight in the range of 70,000 to 110,000 porous pellets. The method of claim 1, wherein the adhesion promoter is an aromatic hydrocarbon resin having a softening point of 90 to 125 ° C. The method according to any one of claims 1 to 3, Into the aggregate formulation of 85 to 87% of coarse aggregate, 8 to 10% of sand, and 4.5 to 5.5% of filler, high viscosity modified asphalt prepared by adding 11 to 13% of the modifier to the amount of 4.5 to 5.5% of asphalt was added. Method for producing a drainage asphalt modifier, characterized in that it further comprises the step of producing a specimen at a temperature of 165 ± 3 ℃ by mixing in a mix of 180 ± 5 ℃. Modifier for drainage asphalt produced by the method of any one of claims 1 to 3.