KR102118024B1 - Modified ascon composition having high durability - Google Patents

Abstract

The present invention relates to a modified ascon composition with high weather resistance. The modified ascon composition with high weather resistance according to the present invention comprises: mixed aggregate; modified asphalt; and a fiber additive. The present invention according to the above configuration, prevents the plastic deformation and improves crack resistance at a low temperature in winter by producing ascon through mixing the fiber additive.

Description

High-weather modified ascon composition{MODIFIED ASCON COMPOSITION HAVING HIGH DURABILITY}

The present invention relates to a high-weather modified ascon composition, and more specifically, a modified asphalt containing a high-weather modified additive and a fiber additive designed for weather-resistant ascon are mixed to prepare ascon, thereby preventing plastic deformation and at low temperatures in winter. It relates to a high-weather modified ascon composition that can improve crack resistance.

In general, road pavers are largely divided into cement concrete (hereafter, ready-mixed concrete) and asphalt concrete. The ready-mixed concrete has the advantages of excellent strength of the packaging material and good durability after construction, but it is difficult to maintain, so the noise and driving characteristics of the driver are not good.

On the other hand, the durability of Ascon is less than that of the ready-mixed concrete, but partial repair is easy, and the riding comfort and noise felt by the vehicle are excellent.

Ascon is divided into heated ascon, medium-temperature ascon, and normal-temperature ascon according to the production method.The heated ascon is produced by mixing aggregate, the raw material for production, to 180~190℃ and mixing asphalt, which is a binder heated to 150~160℃, and medium temperature. Ascon is an asphalt that is produced by lowering the production temperature of aggregate and asphalt to 100~120℃. Ascon at room temperature is asphalt as the production temperature of ascon is room temperature.

There are several types of asphalt concrete, general asphalt concrete paved on general roads, modified fluid asphalt concrete applied to roads with high traffic loads by improving aggregates or asphalt, and drainage asphalt concrete, which is a functional asphalt concrete manufactured by giving special functions to asphalt concrete, There are low noise asphalt and special asphalt concrete for bridges.

Drainage Ascon is an asphalt cone for vehicles to prevent accidents by draining water on the road in a short time when a large amount of water enters the road for any reason. Ascon is an excellent noise reduction package compared to cement concrete. Among them, low noise ascon is an asphalt designed to reduce noise generation than general asphalt.

The special asphalt concrete for bridges is a special asphalt concrete used for bridges. The asphalt concrete packaged in general bridges is basically a concrete layer of concrete after laying a certain thickness of waterproof layer on the bridge deck to prevent the inflow of water. It is applied after applying only emulsified asphalt coating, which is performed during general asphalt construction on the bridge deck. The special asphalt concrete for bridges is that the asphalt concrete itself forms a perfect waterproof layer and replaces the waterproof layer of the asphalt concrete lower layer.

Ascon has a porosity in the mixture of 4 to 5% after application. As time passes after paving, through the passage of vehicles, the air gap decreases and begins to reach 0%, resulting in plastic deformation, that is, a phenomenon in which the package descends to the lower layer at vertical pressure. When the porosity of the asphalt mixture is mainly determined through the mixing of aggregates, detailed adjustment is made with the content of asphalt. As a result, asphalt and additives other than aggregates must play a role in maintaining the designed porosity.

Modified in-flow ascons installed in areas with heavy traffic, low-concentration asphalt concrete with a porosity of around 10%, and drainage ascons with an ascon porosity of around 20% are also designed to replace the waterproofing of bridges. Special ascons for dragons, these ascons have to be maintained for a long period of time in severe conditions already under construction. The effect of the low noise, drainage-type asphalt concrete will be reduced as the porosity decreases, and the modified fluid-resistant asphalt concrete and special asphalt concrete for bridges should be kept at the maximum porosity at the time of design to escape plastic deformation.

Due to this reason, the above-mentioned ascons basically require higher physical properties. In addition, the temperature of the pavement gradually increases due to the recent global warming, and especially in summer, the internal temperature of the pavement rises by 60°C or more and affects the deformation of asphalt. The road is prone to damage, and in winter, cracks at low temperatures, i.e., cracks, may cause road damage, and the development of high-weather modified ascons that can improve the performance of these asphalts is desperate. to be.

Domestic registered patent No. 10-0483756 (registered on April 08, 2005) Domestic registered patent No. 10-2021346 (Registered on September 06, 2019) Domestic registered patent No. 10-1906757 (registered on October 02, 2018)

The present invention provides a high-weather modified ascon composition capable of preventing plastic deformation and improving crack resistance at low temperatures in winter by preparing ascon by mixing a modified asphalt containing a high weather-resistant modifying additive and a fiber additive designed for weather-resistant ascon. To provide.

In addition, the present invention is to provide a high-weather modified ascon composition that can prevent product defects that may occur during field application by improving the vulnerable physical properties of conventional ascon by mixing the fiber additives to produce ascon.

Various problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The high-weather modified asphalt concrete composition according to the present invention includes a mixed aggregate, a modified asphalt and a fiber additive, the mixed aggregate 91 to 96 parts by weight, 3 to 8 parts by weight of the modified asphalt, and 0.1 to 0.4 parts by weight of the fiber additive The mixed aggregate is used by mixing aggregate, stone powder, and filler, and the fiber additive is used by mixing cellulose fiber, natural hemp fiber, Wollastonite fiber, and sepiolite fiber. , The cellulose fiber, natural hemp fiber, wallacetonite fiber and sepiolite fiber may be mixed in a weight ratio of 1:1:1:1.

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The modified ascon may be any one selected from general modified asphalt, low noise modified asphalt, drainage modified asphalt, or special asphalt concrete for bridges.

The fiber additive may be any one or more selected from cellulose fiber or synthetic fiber, or any one or more selected from recycled newspaper, recycled wallpaper or recycled kraft paper, and the fiber additive may have a length of 0.3 to 3 mm.

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The fiber additive further comprises a binder, the binder is contained in a weight ratio of 5 to 15 parts by weight relative to 100 parts by weight of the fiber additive, the binder is 10 to 30 parts by weight of a silicone mixed solution, polyvinyl alcohol (polyvinyl alcohol) 3 To 6 parts by weight, natural rubber 0.1 to 1 part by weight, water repellent 1 to 5 parts by weight, thiourea compounds 0.1 to 1.5 parts by weight, polyacrylic acid 10 to 20 parts by weight, ethylene glycol 1 to 3 Weight parts, 0.1 to 2 parts by weight of potassium formate (PF), 0.5 to 1.5 parts by weight of sodium gluconate, 0.01 to 0.1 parts by weight of antifoaming agent, 0.01 to 0.1 parts by weight of preservative and 5 to 10 parts by weight of distilled water Can be.

Specific details of other embodiments are included in the detailed description.

The high-weather modified ascon composition according to the present invention can prevent plastic deformation and improve crack resistance at low temperatures in winter by preparing ascon by mixing a modified asphalt containing a high-weather modified additive and a fiber additive designed for weather-resistant ascon. have.

In addition, the high-weather modified ascon composition according to the present invention can improve the vulnerable physical properties of conventional ascon by mixing the fiber additives to prepare ascon, thereby preventing product defects that may occur during field application.

It will be fully understood that embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed contents are thorough and complete and that the spirit of the present invention is sufficiently conveyed to those skilled in the art.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

Hereinafter, the high-weather modified ascon composition according to the present invention will be described in detail with reference to preferred examples.

The high-weather modified asphalt concrete composition according to the present invention comprises a mixed aggregate, modified asphalt and a fiber additive.

In addition, in the present invention, the high-weather modified ascon composition may be included in a weight ratio of 91 to 96 parts by weight of the mixed aggregate, 3 to 8 parts by weight of the modified asphalt, and 0.1 to 0.4 parts by weight of the fiber additive.

Further, in the present invention, the modified asphalt may be any one selected from general modified asphalt, low noise modified asphalt, drainage modified asphalt, or special asphalt for bridges.

The mixed aggregate means aggregate, stone powder, and filler. For example, the aggregate may have different types of aggregate depending on the type of ascon mentioned above, 19 mm, 13 mm, 10 mm, 8 mm, special drainage and thin layer In the case of packaging fluid-resistant asphalt concrete, one having a particle diameter of 5 mm may be used, and the stone powder may be used having a particle diameter of 6 mm or less, and the filler may include limestone powder, slaked lime, cement, fly ash, recovered dust, steelmaking dust, etc. Can be used, the water content should be less than 1%, the particle size can be used according to the standards of KS F 3501.

The particle size of the aggregate used in the high-weather modified ascon composition according to the present invention varies depending on the type of ascon mentioned above. What is shown in [Table 1] below is described as an example of the particle size standard of the general flow-resistant asphalt concrete.

Standard particle size of aggregate Sieve size Type of mixture WC-2 WC-3 WC-4 WC-5 13F ^a 20 20F 20R ^a



Passing mass
Percentage (%) 25 mm - 100 100 100 20 mm 100 90~100 95~100 90~100 13 mm 95~100 72~90 75-90 69~84 10 mm 84~92 56~80 67~84 56~74 5 mm 55~70 35~65 45~65 35~55 2.5mm 35~50 23~49 35~50 23~38 0.6mm 18~30 10~28 18~30 10~23 0.3mm 10~21 5~16 10~21 5~16 0.15mm 6~16 3~13 6~16 3~12 0.08mm 4-8 2-8 4-8 2~10

Note) ^a WC (Wearing course) means a heated asphalt mixture for the surface layer, F is a mixture containing a large amount of mineral fillers (stone powder), and R is a mixture having high resistance to plastic deformation.

(1) First embodiment

The modified asphalt is, for example, 85 to 95 parts by weight of asphalt, 2 to 6 parts by weight of ethylene vinyl acetate A, 1 to 5 parts by weight of ethylene vinyl acetate B, styrene ethylene butylene styrene copolymer (SEBS) 0.65 to 4 parts by weight , Styrene Butylene Styrene (SBS) 1 to 2 parts by weight, 0.15 to 0.3 parts by weight of the crosslinking agent and 0.2 to 1.0 parts by weight of the adhesion promoter may be included to be prepared as PG 76-22 and PG 82-22.

In addition, the modified asphalt is, for example, 85 to 95 parts by weight of asphalt, 1 to 4 parts by weight of ethylene vinyl acetate A, 1 to 3 parts by weight of ethylene vinyl acetate B, styrene ethylene butylene styrene copolymer (SEBS) 2 to 6 parts by weight Part, styrene isoprene styrene (SIS) 0.5 to 4 parts by weight, styrene butylene styrene (SBS) 0.5 to 1.5 parts by weight, crosslinking agent 0.15 to 0.3 parts by weight and adhesion promoter 0.2 to 1.0 parts by weight contained in PG 82-34 Can be manufactured as.

The asphalt may be "AP-5", which is one of the asphalt grades that is refined and left in the refinery (usually used for pavement).

The amount of the asphalt may be used in an amount of 85 to 95 parts by weight based on 100 parts by weight of the whole modified asphalt. When the content of the asphalt is less than 85 parts by weight, a large amount of SBS or EVA is used. , In this case, the materials are unstable in the asphalt, and thus, it is difficult to be uniformly dispersed in general. If it exceeds 95 parts by weight, it is difficult to obtain good asphalt properties at high and low temperatures.

The standard for distinguishing the physical properties of asphalt is the PG grade according to the "KS F 2389" asphalt commonality grade, which determines the temperature range in which the manufactured asphalt can be used. Generally, PG 64-22 is used for AP-5 (for general asphalt concrete). Asphalt grade), and PG 76-22 is a modified asphalt. In the low-noise ascon, drainage-ascon, and bridge-specific ascons of the present invention, modified ascons having better performance are used, which are modified asphalts represented by PG 82-22 and PG 82-34. The first number is high temperature, and the last number is low temperature, which means the temperature below zero.

Here, the physical property test for high temperature is measured by rheometer through a measuring instrument called rheometer. In the case of low temperature, the strength test of asphalt is performed at low temperature.

Asphalt composition according to the present invention, based on the total 100 parts by weight of the composition, VA content of 10 to 25% by weight of ethylene vinyl acetate A 2 to 6 parts by weight or 1 to 4 parts by weight, and VA content of 25 to 50% by weight Phosphorus ethylene vinyl acetate B 1 to 5 parts by weight or 1 to 3 parts by weight.

Here, ethylene vinyl acetate B having a high VA content has a low viscosity and may even exist as a liquid at room temperature. In addition, ethylene vinyl acetate A, which has a low VA content, has a high self-hardness and thus has a low dispersibility in asphalt. For this reason, by adjusting the VA content in an appropriate combination, the VA content is relatively high to increase adhesion, and the VA content is low to improve physical properties at high temperature.

The styrene butylene styrene (Styrene Butylene Styrene, SBS) is a polymer containing a double bond by itself, and tends to have poor weather resistance. Although it goes through a process of reacting a double bond through crosslinking, it is basically a polymer having poor weather resistance, and its amount can be appropriately adjusted.

Styrene Butylene Styrene (SBS) is used in an amount of 1 to 2 parts by weight or 2 to 6 parts by weight based on 100 parts by weight of the whole modified asphalt, and Styrene Ethylene Butylene Styrene (SEBS) aerial The coalescence can be used in an amount of 0.65 to 4 parts by weight.

The styrene isoprene styrene (Styrene-Isoprene Styrene) was used to secure the low-temperature properties of the modified asphalt, and when increasing the amount in the whole modified asphalt, it has a positive effect on the high-temperature properties, but the amount is 0.5-4 parts by weight.

(2) Second embodiment

The modified asphalt is, for example, 83 to 92 parts by weight of asphalt, 2 to 6 parts by weight of a polyester elastomer, 1 to 5 parts by weight of a thermoplastic polyurethane resin (TPU), acrylonitrile-butadiene rubber (NBR; acrylonitrile butadiene rubber) 0.5 to 2 parts by weight, styrene ethylene butylene styrene copolymer (SEBS) 1 to 4 parts by weight, styrene isoprene styrene (SIS) 0.5 to 4 parts by weight, styrene butylene styrene (SBS) 0.5 to 1.5 parts by weight, arc Included in the weight ratio of 0.3 to 0.8 parts by weight of UV stabilizer, 0.2 to 0.5 parts by weight of antioxidant, 0.15 to 0.3 parts by weight of crosslinking agent and 0.2 to 1.0 parts by weight of adhesion promoter, to PG 76-22, PG 82-22 and PG 82-34 Can be manufactured.

The asphalt may be "AP-5", which is one of the asphalt grades that is refined and left in the refinery (usually used for pavement).

The amount of the asphalt may be used in an amount of 85 to 95 parts by weight based on 100 parts by weight of the entire modified asphalt. When the content of the asphalt is less than 85 parts by weight, the amount of the polyester elastomer or SBS in the asphalt is relatively relatively. A large amount is used. In this case, the materials are unstable in the asphalt, and thus, it is difficult to disperse them uniformly. If it exceeds 95 parts by weight, it is difficult to obtain good asphalt properties at high and low temperatures.

The standard for distinguishing the physical properties of asphalt is the PG grade according to the "KS F 2389" asphalt commonality grade, which determines the temperature range in which the manufactured asphalt can be used. Generally, PG 64-22 is used for AP-5 (for general asphalt). Asphalt grade), and PG 76-22 is a modified asphalt. In the low-noise ascon, drainage-type asphalt, and special asphalt for bridges of the present invention, a modified asphalt with better performance is used, which uses modified asphalt represented by PG 82-22 and PG 82-34. The first number is high temperature, and the last number is low temperature, which means the temperature below zero.

Here, the physical property test for high temperature is measured through a measuring instrument called a rheometer, and in the case of low temperature, the strength test of asphalt is performed at low temperature.

Asphalt composition according to the present invention, 2 to 6 parts by weight of a polyester-based elastic body is used in the total content of the composition, and the polyester-based elastic body is a thermoplastic resin having various properties of flexible plastics, which has excellent impact resistance, elasticity, creep resistance, It has good flexibility at low temperature, good physical properties at high temperature, strong resistance to chemicals, oils and solvents, and excellent UV resistance.

The thermoplastic polyurethane resin (TPU) is a linear polymer formed by the reaction of isocyanate and polyol, and an acrylic modified polyurethane resin that does not undergo a chemical crosslinking reaction may be used. The acrylic modified polyurethane resin is acrylic prepared by the following manufacturing method. Modified polyurethane resins can be used.

First, a diisocyanate (Diisocyanate), polyol (Polyol) and an organic solvent (Organic Solvent) can be prepared and mixed to prepare a mixed solution, wherein the mixed solution is diisocyanate 1 mol (mol) and polyol 0.4 to 1.4 mol (mol) Prepared in a ratio of, the organic solvent may be included in the total content of the mixed solution to 65 to 75% by weight (wt%).

The diisocyanate is toluene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), Any one or more selected from the group consisting of isophorone diisocyanate (IPDI) and 4,4'-methylenebis (cyclohexyl isocyanate) (HMDI) can be used. .

The polyol may be any one or more selected from polyether polyols or polyester polyols.

The organic solvent may be any one or more selected from the group consisting of toluene, methyl ethyl ketone, ethyl acetate, acetone and dimethylformamide.

Next, by reacting the mixed solution composed of the diisocyanate, polyol, and organic solvent, a polyurethane having an isocyanate end group may be prepared, wherein the reaction is performed at a temperature of 80 to 85° C. for 3.5 to 4.5 hours. It can be done.

Next, while adding 0.1 to 0.3 mol (mol) of a monomer containing a hydroxy group to a polyurethane having an isocyanate end group (Isocyanate terminated Polyurethane), a temperature of 80 to 85°C In the reaction for 1 to 3 hours, a polyurethane having a vinyl end group (Vinyl terminated Polyurethane) may be prepared.

The monomer containing the hydroxy group (Monomer (containing hydroxy group)) is 2-hydroxyethyl methacrylate (2-Hydroxyethyl methacrylate), 2-hydroxypropyl methacrylate (2-Hydroxypropyl methacrylate), 2-ha Any one or more selected from the group consisting of 2-hydroxyethyl acrylate and allyl alcohol may be used.

Subsequently, an acrylic-modified polyurethane resin may be prepared by reacting while introducing a monomer into the polyurethane having the vinyl terminal group (Vinyl terminated Polyurethane), wherein the polyurethane and monomer having the vinyl terminal group each have a vinyl terminal group Polyurethane may be included in a weight ratio of 70 to 90% by weight and 10 to 30% by weight of the monomer.

In addition, the acrylic modified polyurethane resin may be prepared by reacting the polyurethane having the vinyl end group at a temperature of 75 to 80° C. for 1 to 3 hours while introducing a monomer.

The monomer may be any one or more selected from the group consisting of styrene, methyl methacrylate, acrylonitrile, acrylic acid, and acrylic monomer.

The acrylonitrile-butadiene-based rubber (NBR) is prepared by copolymerizing acrylonitrile and butadiene by batch or continuous low-temperature emulsion polymerization, and has a nitrile group having a strong polarity and a petroleum-based solubility parameter of 9 or more. It is said to be the most representative oil-resistant rubber because it is strong in solvents, and has excellent compatibility with vinyl chloride resin, nitrocellulose, and phenol resin.

In addition, the acrylonitrile-butadiene-based rubber (NBR) has not only excellent oil resistance than natural rubber, styrene-butadiene rubber (SBR), but also has good abrasion resistance and aging resistance, low gas permeability, and strong cohesion, It is widely used in oil-resistant hoses, belts, rollers, tank linings, adhesives, shoe soles, tubes, sealers, and packing agents.

The styrene butylene styrene (Styrene Butylene Styrene, SBS) is a polymer containing a double bond by itself, and tends to have poor weather resistance. Although it goes through a process of reacting a double bond through crosslinking, it is basically a polymer having poor weather resistance, and its amount can be appropriately adjusted.

Styrene Butylene Styrene (SBS) is used in an amount of 1 to 2 parts by weight or 2 to 6 parts by weight based on 100 parts by weight of the whole modified asphalt, and Styrene Ethylene Butylene Styrene (SEBS) aerial The coalescence can be used in an amount of 0.65 to 4 parts by weight.

The styrene isoprene styrene (Styrene-Isoprene Styrene) was used to secure the low-temperature properties of the modified asphalt, and when increasing the amount used in the whole modified asphalt, it has a positive effect on the high-temperature properties, but the amount is 0.5-4 parts by weight.

The UV stabilizer used as the additive uses 0.3 to 0.8 parts by weight, and its types include 2-HYDROXYBENZOPHENONES, 2-HYDROXY PHENYL BENZOTRIAZOLES, HINDERED AMINES, ORGANIC NICKEL compounds, SALICYLATES, CINNAMATE DERIVATIVES, RESORCINOL MONOBENZOATES, OXANI Stability to UV is important in the development of high-weather modified ascons.

The antioxidant used as the additive uses 0.2 to 0.5 parts by weight, and a phenol-based, phosphite & phosphonite-based antioxidant is also the main role of high-weather modified ascon.

The fiber additive may use cellulose fiber or synthetic fiber, and the fiber additive may have a length of 0.3 to 3 mm. For example, the fiber additive may be any one selected from recycled newspaper, recycled wallpaper, or recycled kraft paper. The above may also be used.

In addition, in order to reduce the volume in the ascon production process, 0.3 to 3 mm of the fiber additive, short fibers, is processed into cylindrical pellets having a diameter of 4 mm and a length of 5 mm to 30 mm to be input into the asphalt.

Alternatively, the fiber additive may be used by mixing cellulose fiber, natural hemp fiber, Wollastonite fiber and sepiolite fiber, wherein the cellulose fiber, natural hemp fiber, wallacetonite fiber and Sepiolite fibers may be mixed in a weight ratio of 1:1:1:1 to constitute a fiber additive.

The cellulose fiber may impart construction stability to prevent material from sagging or falling during the construction of modified asphalt, and may be integrated with the modified asphalt to increase crack resistance to impart dimensional stability.

The cellulose fiber may be a synthetic resin-based fiber or a fiber extracted from natural wood, and preferably a fiber extracted from natural wood. The fiber extracted from the natural wood is environmentally friendly, and since the fiber surface is hydrophilic, it is easy to adsorb physical moisture and thus may have good wettability.

The natural hemp fiber can be prevented from being destroyed by controlling the growth of cracks occurring in the asphalt, which is short and randomly dispersed in the asphalt. That is, the natural hemp fiber can stop or delay the growth of cracks inside the asphalt and can improve the drawing characteristics and crack resistance of the asphalt as a result, the natural fiber is the characteristics as shown in [Table 2] below. Can have

Characteristics of natural hemp fiber Elastic modulus (GPa) Density(g/mm ³ ) Fiber length(mm) Fiber diameter(mm) Tensile strength (MPa) Surface 61 1.26 3 0.015 510 Hydrophilic

The Wallacetonite fiber and the sepiolite fiber are natural mineral fibers, which have recently been replaced by asbestos fibers, and are increasing in application. The properties of the fibers are shown in Table 3 below.

The Wallacetonite fiber has many research results that can be applied to concrete and cement products overseas to secure excellent mechanical performance and durability. The main chemical composition of the Wallacetonite fiber is shown in [Table 4] below. As it is.

The sepiolite is also referred to as a seagrass stone because the fibrous and earthy crystals are collected to form an aggregate such as leather, and the lump is light and difficult to make into a powder, and the dry one floats in water. The sepiolite has a hardness of 2 to 2.5, a specific gravity of 2, has a white, gray, light brown, light green, etc., streak color is white, and has a ground luster or silk gloss. The main chemical composition of the sepiolite fiber is as follows 5].

Characteristics of mineral fiber division  Wallacetonite Fiber Sepiolite fiber Length (mm) <10 4~5 Diameter (㎛) 25~40 30~80 Density (g/mm3) 2.9 2.0

Main chemical composition of Wallacetonite fiber ingredient SiO ₂ CaO MgO Al ₂ O ₃ Fe ₂ O ₃ K ₂ O Mixing ratio (%) 40~55 40-50 3-5 <1.0 <1.0 <1.0

Main chemical composition of sepiolite fiber ingredient SiO ₂ CaO MgO Al ₂ O ₃ Fe ₂ O ₃ FeO Mixing ratio (%) 48.51 17.60 20.33 0.35 0.36 0.01

The fiber additive used in the present invention requires production processing through a special binder, and the binder may be included in a weight ratio of 5 to 15 parts by weight with respect to 100 parts by weight of the fiber additive.

The binder is 10 to 30 parts by weight of a silicone mixed solution, 3 to 6 parts by weight of polyvinyl alcohol, 0.1 to 1 part by weight of natural rubber, 1 to 5 parts by weight of a water repellent agent, thiourea compounds 0.1 to 1.5 parts by weight, 10 to 20 parts by weight of polyacrylic acid, 1 to 3 parts by weight of ethylene glycol, 0.1 to 2 parts by weight of potassium formate (PF), 0.5 to 1.5 parts by weight of sodium gluconate, 0.01 to 0.1 parts by weight of antifoaming agent, It may be prepared by mixing in a weight ratio of 0.01 to 0.1 parts by weight of preservative and 5 to 10 parts by weight of distilled water.

The silicone mixed solution may be prepared by mixing a solvent with a mixture of polydimethylsiloxane, polyacrylic silicone and alkenyl group-containing organopolysiloxane, followed by sequentially adding a silane coupling agent and a catalyst.

In the above step, the silicone mixed solution is blended in a weight ratio of 30 to 40 parts by weight of polydimethylsiloxane, 40 to 70 parts by weight of polyacrylic silicone and 15 to 25 parts by weight of alkenyl group-containing organopolysiloxane based on 100 parts by weight of the solvent, and a silane coupling agent. 1 to 3 parts by weight and the catalyst may be included in a weight ratio of 0.05 to 0.1 parts by weight.

The solvent is a mixture of toluene (toluene), methyl ethyl ketone (MEK), and ethyl acetate (EA). A mixed solvent is used. The toluene, methyl ethyl ketone and ethyl acetate are mixed in a weight ratio of 2:3:2. May be prepared by mixing the toluene, methyl ethyl ketone and ethyl acetate to prepare a mixed solvent, and then stirring the mixed solvent at a rate of 750 to 850 rpm for 5 to 10 minutes, and the fibers aggregated in a pellet form ascon It is distributed within each fiber bundle and serves to facilitate mixing.

The polydimethylsiloxane may be represented by the following [Chemical Formula 1] as a silicone-based resin, wherein the polydimethylsiloxane serves as a binder for immobilizing the fiber bundle of the crude oil additive in the form of pellets and adding ascon to the production temperature of ascon. Phosphorus participates in a curing reaction at around 160°C, and serves to improve the durability of ascon.

[Formula 1]

In [Formula 1], m is an integer of 10 to 300, n is an integer of 10 to 300, and the viscosity of the polydimethylsiloxane may be 500 to 10,000 cps. When the viscosity of the polydimethylsiloxane is less than 500 cps, Coating and dryness problems may occur, and when it exceeds 10,000 cps, flatness problems due to viscosity increase may occur.

The polyacrylic silicone is 60 parts by weight of toluene, 25 parts by weight of silicone oil in which dimethyl silicone and silicone acrylate are mixed at a weight ratio of 1:1, 15 parts by weight of metamethyl acrylic (methyl methacrylate, methamethyl acryl), methacrylic acid (methacrylic acid) 0.8 parts by weight, 2-HEMA (hydroxyethyl methacrylate) 4 parts by weight and 0.5 parts by weight of BPO (benzoyl peroxide) was added, and then polyacrylic silicone prepared by reacting at 115 to 125°C for 4 to 6 hours can be used. have.

The alkenyl group-containing organopolysiloxane is a silicone polymer for forming silicone, and an alkenyl group-containing organopolysiloxane having a viscosity of 520 to 550 mpa·s may be used. For example, the alkenyl group is a vinyl group, a propenyl group, and a pen. The organopolysiloxane may be any one or more selected from the group consisting of tenyl groups, and the organopolysiloxane is a dimethylpolysiloxane blocked with dimethylvinylsiloxy groups at both ends of the molecular chain, and a dimethylsiloxane·methylvinylsiloxane blocked with dimethylvinylsiloxane groups at both ends of the molecular chain. It may be any one or more selected from the group consisting of a dimethylsiloxane/methylphenylsiloxane copolymer in which dimethyl vinylsiloxy groups at both ends of the molecular chain are blocked, and a methylvinylpolysiloxane in which trimethylsiloxy groups at both ends of the molecular chain are blocked.

The silane coupling agent may be any one or more selected from the group consisting of epoxy silane-based, aminosilane-based, and isocyanate-silane-based, for example, GPTMS (glycidoxypropyl trimethoxy silane) may be used as the silane coupling agent.

The catalyst may be platinum or a platinum-based chelate catalyst including platinum, for example, the platinum-based chelate catalyst may be one of platinum group elements (eg, Pt, Pd, Hr, Ru, Os, Ir). It may mean a catalyst having a single or multiple coordination bond with an organic molecule containing chlorine ion or oxygen and/or nitrogen.

The polyvinyl alcohol has properties such as excellent linearity, flat zig-zag conformation, high crystallinity, excellent alkali resistance to withstand even at pH 13.5 or higher, and excellent adhesion. Due to these properties, polyvinyl alcohol can be applied to high strength and high modulus polyvinyl alcohol fibers. Polyvinyl alcohol fibers have been in the spotlight as industrial fibers such as reinforcing materials such as cement, concrete or plastic, asbestos replacement materials, and tire cords.

The application of the polyvinyl alcohol has been expanded due to the excellent physical properties and various application ranges as described above. In particular, many studies have been conducted on the production of high strength and high modulus gels using polyvinyl alcohol and high performance polyvinyl alcohol fibers.

As an example, polyvinyl alcohol is applicable to a membrane separation technology using a polymer film. Polymer films are used in a wide range of fields, including the chemical industry, biotechnology, resources, energy, and the environment. In particular, the pervaporation method for separating a liquid organic mixture or an aqueous organic solution has many advantages such as energy saving and device miniaturization compared to a conventional distillation method, and is widely used for anhydrous alcohol production and separation of organic mixtures. Therefore, it can be said that polyvinyl alcohol is highly utilized in the field of polymer films.

In addition, polyvinyl alcohol can be applied to the technology of manufacturing microfibers by electrospinning technology. The method of manufacturing the microfibers by electrospinning technology induces the formation of a liquid jet in a solution discharged from a spinneret by applying a high voltage to the polymer resin solution, which is caused by electrical repulsion during volatilization of the solvent. It is characterized in that a fine fiber is obtained by continuous stretching.

Particularly, when electrospinning technology is used, the fiber yarns are accumulated in the collector in the form of a web, which is a three-dimensional network structure. These microfibers have high specific surface area and tension, mechanical properties, chemical properties, and cell biomaterial recognition. do. Therefore, polyvinyl alcohol can be applied to a wide range of fields such as microfibers, industrial materials including filters, photochemical sensor materials, biomedical materials, and beauty materials.

The natural rubber (Natural rubber: NR) is a rubber using a raw material produced from plants, mainly using a raw material produced from a rubber tree. The natural rubber may be a general natural rubber or a modified natural rubber.

General natural rubber can be used as long as it is known as natural rubber, and the origin and the like are not limited. In addition, the general natural rubber contains cis-1,4-polyisoprene as the main chain, but may also contain trans-1,4-polyisoprene depending on the required properties.

Therefore, the natural rubber includes, in addition to natural rubber containing cis-1,4-polyisoprene as the main chain, for example, trans-1,4-polyisoprene such as Valata, which is a kind of rubber from South America sapota family, as the main chain. Natural rubber may also be included.

The modified natural rubber means that the general natural rubber is modified or purified. For example, the modified natural rubber includes epoxidized natural rubber, deprotein natural rubber, hydrogenated natural rubber, and the like.

The water repellent agent is selected from the group consisting of methylhydrogenpolysiloxane, dimethylpolysiloxane, polytetrafluoroethylene, fluoroethylenepropylene, tetrafluoroethylene perfluoroalkyl vinyl ether, polyvinylidene fluoride and homopolymer polyvinylidene fluoride. One or more may be used.

The thiourea compounds may be included to keep the admixture stable, the thiourea compounds are thiourea (NH ₂ ) ₂ CS or general formula (R1R2N)(R3R4N)C=S (where R1, R2 , R3, R4 may each independently include a thiourea derivative represented by a hydrogen atom, an ethyl group or a methyl group.

The polyacrylic acid may be used to impart fluidity as a water reducing agent. In the present invention, the polyacrylic acid may be a conventional material known in the art, for example, WRM50 (LG Chemical Co.) may be used as the polyacrylic acid.

The ethylene glycol (ethylene glycol) may be used to reduce the freezing temperature.

Since the potassium formate (PF) has a very low freezing point and performs a condensation promoting function at a low temperature, it can be used as an anti-freeze agent, and when mixed with modified asphalt, it can also play a role of enhancing strength.

The sodium gluconate (sodium gluconate) can be used to prevent rapid, the anti-foaming agent can be used to remove the air bubbles generated when mixing the components, the anti-foaming agent can be used in the conventional material known in the art For example, Agitan 295 (Munzing, Germany) may be used as the antifoaming agent.

The preservative is used to prevent decay during long-term storage of the admixture, and the preservative may be a conventional material known in the art, for example, as the preservative, PG100 (CDIA Co., Ltd. )) can be used.

The distilled water is used to mix the components included in the admixture, and is not limited to a type, but it is preferable to use clean purified distilled water without impurities.

Hereinafter, examples of the high-weather modified ascon composition according to the present invention will be described in more detail. The following examples illustrate some of the various specifications and are not exhaustive.

1. General Modified Ascon

(1) General modified ascon production example
division Mixture composition (% by weight) Mixed aggregate Textile additive Reform
asphalt Aggregate (13mm) Stone powder (6mm) filler Example 1-1 45.2 46 3 0.2 5.6 Example 1-2 45.2 46 3 0.2 5.6 Example 1-3 45.1 46 3 0.3 5.6 Example 1-4 45.1 46 3 0.3 5.6 Comparative Example 1-1 45.4 46 3 0 5.6 Comparative Example 1-2 45.4 46 3 0 5.6

(2) General modified ascon quality standards Mixture type Assembly drawing
Ascon Tightness
Ascon Fineness
Ascon Consolidation gap
Ascon Tightness
Ascon Maximum particle size (20mm) (20mm) (13mm) (13mm) (13mm) (20F) (13F) Compaction number (times) 50 (75) 50 Stability (N)  More than 6,000 More than 6,000
(Over 7,500) More than 6,000 Flow value
(1/100 cm) 20-40 Void룔 (%) 3~7 3~6 3~7 3-5 Saturation (%) 65~85 70~85(65~80) 65~85 75~85 Indirect tensile strength
(N/㎟) 0.8 or more Toughness
(N*㎜) More than 8,000 Tensile strength after immersion
Indices 0.7 or more

(3) Results division PG rating Marshall stability
(N) Flow value
(1/100 cm) Seal
Intensity ratio
(TSR) dynamic
Stability
(Times/mm) 6000
More than Baseline
20~40 Baseline
0.75 or more More than 2000 Example 1-1 76-22 11258 32 0.77 4523 Example 1-2 76-22 11598 31 0.79 4685 Example 1-3 76-22 12501 33 0.82 4589 Example 1-4 76-22 12011 31 0.84 4956 Comparative Example 1-1 76-22 9500 32 0.76 3200 Comparative Example 1-2 76-22 9365 35 0.78 2891

2. Drainage modified ascon

(1) Manufacturing example of drainage modified ascon
division Mixture composition (% by weight) Mixed aggregate Textile additive Reform
asphalt Aggregate (13mm) Stone powder (6mm) filler Example 2-1 71.7 17 5.7 0.2 5.4 Example 2-2 71.7 17 5.7 0.2 5.4 Example 2-3 71.6 17 5.7 0.3 5.4 Example 2-4 71.6 17 5.7 0.3 5.4 Comparative Example 2-1 71.9 17 5.7 0 5.4 Comparative Example 2-2 71.9 17 5.7 0 5.4

(2) Drainage modified ascon quality standards Item standard Ahn Jung-do 5,000 or more Porosity (%) 20±2 Tensile Strength Ratio (TSR) 0.85 or more Cantabro loss rate (%) 20 or less Dynamic stability (times/mm) More than 3,000 Permeability coefficient (cm/sec) 0.01 or more Compaction Double-sided 75 times

(3) Results division PG rating Marshall stability
(N) Flow value
(1/100 cm) Seal
Intensity ratio
(TSR) dynamic
Stability
(Times/mm) 5000 Baseline
20~40 Baseline
More than 0.7 3000
More than Example 2-1 82-22 9914 32 0.86 3720 Example 2-2 82-22 9853 33 0.87 3815 Example 2-3 82-22 10523 33 0.89 4056 Example 2-4 82-22 10025 35 0.88 4201 Comparative Example 2-1 82-22 9521 36 0.86 3320 Comparative Example 2-2 82-22 9241 36 0.85 3425

3. Low noise modified ascon

(1) Example of low-noise modified ascon
division Mixture composition (% by weight) Mixed aggregate Textile additive Reform
asphalt Aggregate (13mm) Stone powder (6mm) filler Example 3-1 68.8 20 5.7 0.2 5.4 Example 3-2 68.8 20 5.7 0.2 5.4 Example 3-3 68.7 20 5.7 0.3 5.4 Example 3-4 68.7 20 5.7 0.3 5.4 Comparative Example 3-1 68.9 20 5.7 0 5.4 Comparative Example 3-2 68.9 20 5.7 0 5.4

(2) Low noise modified ascon quality standards Item standard Stability (N) 5.000 or more Porosity (%) 8~5, 3~8 Cantabro loss rate (%) 20 or less Dynamic stability (times/mm) More than 3,000 Compaction frequency Marshall compaction: 75 on each side

(3) Results division PG rating Marshall stability (N) Flow value
(1/100 cm) Dynamic stability
(Times/mm) 5000 Baseline
20~40 3000
More than Example 3-1 82-22 10254 32 4025 Example 3-2 82-22 10598 33 4105 Example 3-3 82-22 11542 33 4215 Example 3-4 82-22 12598 35 4521 Comparative Example 3-1 82-22 9521 36 3898 Comparative Example 3-2 82-22 9241 36 3867

4. Special modified asphalt for bridge

(1) Examples of special modified asphalt concrete for bridges
division Mixture composition (% by weight) Mixed aggregate Textile additive Reform
asphalt Aggregate (13mm) Stone powder (6mm) filler Example 4-1 40.5 45.5 5.7 0.1 8.2 Example 4-2 40.5 45.5 5.7 0.1 8.2 Example 4-3 40.4 45.5 5.7 0.2 8.2 Example 4-4 40.4 45.5 5.7 0.2 8.2 Comparative Example 4-1 40.6 45.5 5.7 0 8.2 Comparative Example 4-2 40.6 45.5 5.7 0 8.2

(2) Quality standards for special modified asphalt for bridges Item standard Stability (N) 5.000 or more Porosity (%) bottom Top 0.7% or less 2% or less Dynamic stability (times/mm) 2,000 or more Compaction frequency Marshall compaction: 75 on each side

(3) Results division PG rating Marshall stability (N) Flow value
(1/100 cm) Dynamic stability
(Times/mm) 5000 Baseline
20~40 2000
More than Example 4-1 82-34 9548 32 4025 Example 4-2 82-34 9898 33 4105 Example 4-3 82-34 10251 33 4215 Example 4-4 82-34 11254 35 4521 Comparative Example 4-1 82-34 8524 36 3898 Comparative Example 4-2 82-34 8245 36 3867

As described above, although a preferred embodiment of the present invention has been described, those of ordinary skill in the art to which the present invention pertains understand that the present invention can be implemented in other specific forms without changing its technical spirit or essential features. Will be able to. Therefore, it should be understood that the embodiment described above is illustrative in all respects and not limiting.

Claims (6)

Contains mixed aggregates, modified asphalt and fiber additives,
The mixed aggregate is contained in a weight ratio of 91 to 96 parts by weight, 3 to 8 parts by weight of modified asphalt and 0.1 to 0.4 parts by weight of the fiber additive, and the mixed aggregate is used by mixing aggregate, stone powder, and filler,
The fiber additive is a mixture of cellulose fiber, natural hemp fiber, Wallastonite fiber and Sepiolite fiber. Fiber is a high-weather modified ascon composition, characterized in that mixed in a weight ratio of 1:1:1:1.
delete According to claim 1,
The modified asphalt concrete is a high-modified asphalt concrete composition, characterized in that any one selected from general modified asphalt concrete, low noise modified asphalt concrete, drainage modified asphalt concrete or special asphalt concrete for bridge.
According to claim 1,
The fiber additive is any one or more selected from cellulose fibers or synthetic fibers, or any one or more selected from recycled newspapers, recycled wallpaper or recycled kraft paper is used, and the fiber additive has a length of 0.3 to 3 mm. High weathering modified ascon composition.
delete According to claim 1,
The fiber additive further comprises a binder, the binder is included in a weight ratio of 5 to 15 parts by weight with respect to 100 parts by weight of the fiber additive, the binder is 10 to 30 parts by weight of a silicone mixed solution, polyvinyl alcohol (polyvinyl alcohol) 3 To 6 parts by weight, 0.1 to 1 part by weight of natural rubber, 1 to 5 parts by weight of water repellent, 0.1 to 1.5 parts by weight of thiourea compounds, 10 to 20 parts by weight of polyacrylic acid, 1 to 3 of ethylene glycol Parts by weight, 0.1 to 2 parts by weight of potassium formate (PF), 0.5 to 1.5 parts by weight of sodium gluconate, 0.01 to 0.1 parts by weight of antifoaming agent, 0.01 to 0.1 parts by weight of preservative and 5 to 10 parts by weight of distilled water High weathering modified ascon composition, characterized in that.