WO2023055165A1

WO2023055165A1 - Rapid-setting non-adhesive rubber-based modified emulsified asphalt composition comprising high-functional latex, and method for manufacturing same

Info

Publication number: WO2023055165A1
Application number: PCT/KR2022/014743
Authority: WO
Inventors: 심성훈; 고현동
Original assignee: 에이원유화(주)
Priority date: 2021-09-30
Filing date: 2022-09-30
Publication date: 2023-04-06
Also published as: KR102513530B1

Abstract

Disclosed is a modified emulsified asphalt composition comprising: asphalt particles; rubber particles; petroleum resin; water; and an emulsifier, wherein at least a portion of the surface of the asphalt particles is coated with a petroleum resin, and at least a portion of the petroleum resin and dispersed rubber particles are combined.

Description

Super-fast, non-adhesive rubber-based modified emulsified asphalt composition containing high-functional latex and manufacturing method thereof

It relates to an ultra-fast, non-adhesive rubber-based modified emulsified asphalt composition including high-functional latex with excellent curing speed and non-tackiness and a manufacturing method thereof.

In general, road pavement using asphalt uses a method of constructing by laminating asphalt in several layers. If the bonding of the laminated layers is not sufficient, there is a risk that the asphalt layer is easily damaged when a concentrated load is applied to a specific area. Therefore, it is preferable to construct so that several layers of asphalt concrete layers are integrated during construction.

In general, emulsified asphalt is prepared by dispersing the asphalt in a particulate state in water by mixing an emulsifier and an additive with general asphalt. When emulsified asphalt is used, solid or semi-solid asphalt (straight asphalt) can be used at room temperature without heating. Emulsified asphalt is cured or hardened by removing moisture in contact with the aggregate. However, emulsified asphalt may have poor durability when water evaporates after pavement because the bonding force of asphalt particles is weaker than that of heated asphalt.

On the other hand, rapid construction is required for smooth traffic flow during bridge surface pavement, night work, or pavement of old roads. To this end, it is required to reduce the curing time compared to conventional emulsified asphalt. A technique for improving the curing speed by improving the adhesion of emulsified asphalt through additives has been attempted.

In addition, there is a problem that the asphalt concrete layer is damaged due to the adhesion of the asphalt to the tire during driving of a construction machine, a construction vehicle, or a truck after pavement during work. That is, in general, there is a trade-off relationship between improving the curing speed by improving the adhesion of emulsified asphalt and improving durability by reducing the adhesiveness to the tire.

It is to provide an ultra-fast curing non-adhesive rubber-based modified emulsified asphalt composition and a manufacturing method thereof, which simultaneously improve the trade-off relationship between curing speed and non-tackiness compared to conventional emulsified asphalt.

According to one aspect, asphalt particles; rubber particles; petroleum resin; water; and an emulsifier, wherein at least a portion of the surface of the asphalt particle is coated with the petroleum resin, and a modified emulsified asphalt composition in which at least a portion of the petroleum resin and the dispersed rubber particles are combined is provided.

In one embodiment, the modified emulsified asphalt composition includes 57 to 73 parts by weight of asphalt particles, 1 to 8 parts by weight of rubber particles, 0.5 to 12 parts by weight of petroleum resin, 30 to 40 parts by weight of water, and 0.5 to 1.5 parts by weight of an emulsifier. can do.

In one embodiment, the rubber particles may be styrene-butadiene rubber (SBR) latex.

In one embodiment, the rubber particles may be functionalized with an additive.

In one embodiment, the additive may be octylphenol ethoxylate.

In one embodiment, the emulsifier may be tall oil fatty acids.

In one embodiment, the petroleum resin may be a coumarone-indene resin.

In one embodiment, the petroleum resin may be softened with a softening agent.

According to another aspect, (a) preparing an asphalt mixture by mixing asphalt particles and petroleum resin; (b) preparing emulsified water by mixing water and an emulsifier; (c) preparing emulsified asphalt by mixing the asphalt mixture and emulsified water; and (d) preparing a modified emulsified asphalt by mixing rubber particles with the emulsified asphalt.

In one embodiment, the petroleum resin, the petroleum resin and the softener may be softened in a weight ratio of 1: 0.01 to 1.

In one embodiment, the asphalt mixture may include 3 to 15 parts by weight of petroleum resin based on 100 parts by weight of asphalt particles.

In one embodiment, the emulsified water may include 1 to 5 parts by weight of an emulsifier based on 100 parts by weight of water.

In one embodiment, the rubber particles may be prepared by mixing rubber with an additive mixture in which water and additives are mixed in a weight ratio of 1:1.5 to 5.

In one embodiment, 1 to 8 parts by weight of the rubber particles may be mixed with respect to 100 parts by weight of the modified emulsified asphalt composition.

In one embodiment, step (c) may be performed with a colloid mill.

According to one aspect, the modified emulsified asphalt composition has an excellent curing speed compared to the conventional emulsified asphalt, so it is possible to open traffic early by reducing working time. In addition, non-adhesiveness is improved to prevent road damage caused by tires of work vehicles and traffic vehicles, and durability is improved to reduce road repair costs.

Effects of one aspect of the present specification are not limited to the above effects, and should be understood to include all effects that can be inferred from the configuration described in the detailed description or claims of this specification.

Hereinafter, one aspect of the present specification will be described through specific examples. However, the descriptions in this specification may be implemented in many different forms, and thus are not limited to the embodiments described herein.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another member interposed therebetween. . In addition, when a part "includes" a certain component, it means that it may further include other components without excluding other components unless otherwise stated.

When ranges of numerical values are set forth herein, unless the specific range is stated otherwise, the values have the precision of significant digits provided in accordance with the standard rules in chemistry for significant digits. For example, 10 includes the range 5.0 to 14.9, and the number 10.0 includes the range 9.50 to 10.49.

Modified emulsified asphalt composition

The modified emulsified asphalt composition according to one aspect includes asphalt particles; rubber particles; petroleum resin; water; and an emulsifier, wherein at least a portion of the surface of the asphalt particle is coated with the petroleum resin, and at least a portion of the petroleum resin and the dispersed rubber particles may be combined.

The modified emulsified asphalt composition may be obtained by dispersing asphalt particles in water and forming a kind of bonding structure between the asphalt particles and the petroleum resin and rubber particles. Unlike the conventional modified emulsified asphalt in which asphalt particles, petroleum resin, and rubber particles are dispersed in the emulsion, the modified emulsified asphalt composition coats at least a part of the surface of the asphalt particle with a petroleum resin and binds it to the rubber particle, thereby increasing the curing speed and It can significantly improve durability and at the same time realize non-adhesiveness.

The modified emulsified asphalt composition may include 57 to 73 parts by weight of asphalt particles, 1 to 8 parts by weight of rubber particles, 0.5 to 12 parts by weight of petroleum resin, 30 to 40 parts by weight of water, and 0.5 to 1.5 parts by weight of an emulsifier. The total weight of the modified emulsified asphalt composition may be 100 parts by weight, but is not limited thereto.

The asphalt particles may be straight asphalt. The straight asphalt is a main component of the modified emulsified asphalt composition and may serve to impart adhesion between aggregates. The straight asphalt is extracted from crude oil without changing the asphalt components as much as possible.

In general, asphalt is a form in which a high-molecular solid material called asphaltene is dispersed in a high-viscosity oil or resin material called petroleum or marten. The straight asphalt is mainly governed by the properties of gasoline and has excellent elasticity and adhesive strength, so it can exhibit physical properties suitable as a road pavement material. As a non-limiting example, the straight asphalt may be selected from AP-3, AP-5, etc., but is not limited thereto.

The content of the asphalt particles may be 57 to 73 parts by weight, for example, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, It may be 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight or 73 parts by weight, but is not limited thereto. If the content of the asphalt particles is out of the above range, it may be difficult to coat the petroleum resin or the bonding strength as an asphalt binder may be reduced.

At least a portion of the surface of the asphalt particle may be coated with the petroleum resin. By coating the petroleum resin on the asphalt particles, it is possible to improve the fast-setting property by improving the bonding force between the compositions. For example, the petroleum resin may be coated on at least a portion of the surface of the asphalt particle, and the petroleum resin may improve the curing speed by combining with the surface of the asphalt particle, the petroleum resin, or the rubber particle.

The softening point of the modified emulsified asphalt composition including the asphalt particles coated with the petroleum resin may be improved. In addition, the petroleum resin may combine with the rubber particles dispersed in the composition to improve the non-adhesiveness of the modified emulsified asphalt composition. Therefore, the adhesion of the modified emulsified asphalt composition to the tires of a moving vehicle is reduced during the construction work or after the construction is completed, thereby preventing damage to the road.

As an example, the petroleum resin may be a coumarone-indene resin, a C9 petroleum resin, or a mixture thereof. The coumarone-indene resin is a thermoplastic aromatic resin prepared by polymerizing components such as styrene, coumaron, and indene. The coumarone-indene resin may have a softening point of 90 to 100°C. For example, the softening point of the coumarone-indene resin may be 90 ° C, 91 ° C, 92 ° C, 93 ° C, 94 ° C, 95 ° C, 96 ° C, 97 ° C, 98 ° C, 99 ° C or 100 ° C, but is limited thereto. it is not going to be The softening point of the C9 petroleum resin may be 150-160 ° C, for example, 150 ° C, 151 ° C, 152 ° C, 153 ° C, 154 ° C, 155 ° C, 156 ° C, 157 ° C, 158 ° C, 159 ° C or 160 ° C It may be ℃, but is not limited thereto. If the softening point is less than 90 ° C., the non-adhesiveness of the modified emulsified asphalt composition may decrease, and if the softening point exceeds 160 ° C., kneadability between compositions may decrease.

The content of the petroleum resin may be 0.5 to 12 parts by weight. For example, the content of the petroleum resin is 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, It may be 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight or 12 parts by weight, but is not limited thereto. If the content of the petroleum resin is less than 0.5 parts by weight, rapid hardening may be reduced, and if it is greater than 12 parts by weight, stability between compositions may be reduced, resulting in aggregation or deterioration in non-adhesiveness.

As an example, the petroleum resin may further include a softening agent. For example, after pre-mixing and softening a petroleum resin and a softener, the mixture may be mixed with asphalt particles to easily coat the petroleum resin on the asphalt particles. The mixing may be performed in a static mix method. The softener can soften hard petroleum resin, and the softened petroleum resin can be evenly coated on the surface of asphalt particles without agglomeration. Specifically, when the petroleum resin and the softener are pre-mixed and added to the asphalt particles, the rapid hardening of the modified emulsified asphalt composition can be significantly improved compared to mixing the petroleum resin and the softener separately with the asphalt particles. .

The type of the softener is not limited as long as the softening point is lower than that of the petroleum resin. For example, the emollient may be a vegetable oil, an animal oil, a process oil, a heavy oil, a lubricating oil, or a mixture of two or more thereof. For example, when C9 petroleum resin having a softening point of 150 to 160 ° C is used as the petroleum resin, the coumarone-indene resin can be used as a softening agent. When the coumarone-indene resin is used as the petroleum resin, vegetable oil such as soybean oil, animal oil, tall oil, C5 petroleum resin, paraffin wax, process oil, heavy oil, lubricating oil, etc. having a lower softening point can be used.

As a non-limiting example, the modified emulsified asphalt composition may further include an additive, but is not limited thereto. The additive can be adjusted so that the asphalt particles coated with petroleum resin can be evenly mixed and coated. The type of the additive may be one selected from an activation promoter, a regeneration additive, an anti-stripping agent, and a combination of two or more of these, but is not limited thereto.

Meanwhile, the modified emulsified asphalt composition may be prepared in a form in which at least a portion of the surface of the asphalt particle is coated with the petroleum resin, and at least a portion of the petroleum resin is combined with the dispersed rubber particles. Non-adhesiveness may be improved by combining the rubber particles with the petroleum resin instead of directly bonding to the surface of the asphalt particles. In addition, durability of the modified emulsified asphalt composition modified with the rubber particles may be improved.

Conventional modified emulsified asphalt was prepared by including a styrene-butadiene-styrene block copolymer. However, when the styrene-butadiene-styrene block copolymer is used, since the styrene-butadiene-styrene block copolymer must be melted at a high temperature of 180 to 200 ° C., excessive energy is consumed and the manufacturing cost increases. there is.

The rubber particles of the present specification may be derived from styrene-butadiene rubber (SBR) latex. As a non-limiting example, the solid content based on the styrene-butadiene rubber latex may be 60 to 70% by weight, for example, 60% by weight, 61% by weight, 62% by weight, 63% by weight, 64% by weight wt%, 65 wt%, 66 wt%, 67 wt%, 68 wt%, 69 wt%, or 70 wt%, but is not limited thereto.

As a non-limiting example, the styrene-butadiene rubber latex may have a viscosity of 1,000 to 1,800cps at 25°C. For example, the viscosity of the styrene-butadiene rubber latex at 25° C. may be 1,000cps, 1,100cps, 1,200cps, 1,300cps, 1,400cps, 1,500cps, 1,600cps, 1,700cps or 1,800cps, but is not limited thereto . When the viscosity of the styrene-butadiene rubber latex falls within the above range, the modified emulsified asphalt composition including the styrene-butadiene rubber latex may have excellent non-adhesiveness and improved durability.

The rubber particles may be functionalized with additives. For example, if the latex further contains additives, phase separation when mixing styrene-butadiene rubber particles with emulsified asphalt can be suppressed, and the rubber particles are dispersed inside the modified emulsified asphalt composition and bonded to the petroleum resin on the surface of the asphalt particles. It is possible to improve the mechanism that carries out

As an example, the additive may be alkylphenol ethoxylate, for example, octylphenol ethoxylate. The additive may be added to the latex in the form of an additive mixture mixed with water. The water and additives may be diluted in a weight ratio of 1:1.5 to 5. The additive mixture may be mixed with latex to impart functionality to the rubber particles, thereby forming highly functional rubber particles.

When the modified emulsified asphalt composition is prepared using the high-functional rubber particles, the kneading property between the rubber particles and the emulsified asphalt may be improved, and phase separation may be prevented. Accordingly, the anti-peeling effect, durability and non-adhesiveness of the modified emulsified asphalt composition may be improved.

The styrene-butadiene rubber may have a styrene content of 15 to 30% by weight. For example, the styrene content is 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt% %, 26%, 27%, 28%, 29% or 30%. Outside the above range, the effect of improving durability may be insufficient or non-adhesiveness may not be realized. The styrene-butadiene rubber may be a copolymer composed of a unit derived from a styrene monomer and a unit derived from a butadiene monomer.

The content of the rubber particles may be 1 to 8 parts by weight, for example, the content of the rubber particles is 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight Or it may be 8 parts by weight, but is not limited thereto. If the content of the rubber particles is less than 1 part by weight, non-adhesiveness or durability may be reduced, and if it is greater than 8 parts by weight, stability between the asphalt particles, petroleum resin and rubber particles may be reduced, resulting in a decrease in the workability of the modified emulsified asphalt composition. can

The water may be mixed with the emulsifier to produce emulsified water. In the emulsified water, the rubber particles may be dispersed by first coating the asphalt particles with petroleum resin and secondarily adding latex. As a result, at least a portion of the surface of the asphalt particle is coated with a petroleum resin, and rubber particles dispersed in at least a portion of the petroleum resin may be bonded. The water content may be 30 to 40 parts by weight, for example, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight It may be part, 39 parts by weight or 40 parts by weight, but is not limited thereto. If the water content is less than 30 parts by weight and more than 40 parts by weight, the curing rate may decrease.

The emulsifier may allow asphalt to be dispersed in the form of particles without phase separation in water. In addition, the emulsifier may induce coating of the petroleum resin on the surface of the asphalt particles dispersed in the particle form. The content of the emulsifier may be 0.5 to 1.5 parts by weight, for example, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, 1 part by weight, 1.1 parts by weight, 1.2 parts by weight, 1.3 parts by weight. It may be parts by weight, 1.4 parts by weight or 1.5 parts by weight, but is not limited thereto. If the content of the emulsifier is out of the above range, the asphalt may not form particles or the petroleum resin may not be coated.

For example, the emulsifier may be fatty acid salts, for example, tall oil fatty acid. The tall oil fatty acid has a high fatty acid content and low rosin acid and unsaponifiables, so it has excellent drying properties, and a petroleum resin coating layer can be easily formed on the surface of the asphalt particle. Accordingly, the curing speed of the modified emulsified asphalt composition can be significantly improved. When the curing speed of the modified emulsified asphalt is improved, the construction work can be efficiently shortened and workability can be improved.

In a non-limiting example, the emulsified water may further include additives such as calcium chloride and hydrochloric acid. The calcium chloride may be included in an amount of 0.1 to 1.5 parts by weight, and by controlling the salt concentration, it is possible to prevent water from penetrating into the asphalt particles and causing sedimentation. The hydrochloric acid may be included in an amount of 0.01 to 0.3 parts by weight, and by controlling the pH of the emulsified water, the effect of the emulsifier may be improved and the dispersibility of the rubber particles may be improved.

Manufacturing method of modified emulsified asphalt composition

A method for preparing a modified emulsified asphalt composition according to another aspect includes (a) preparing an asphalt mixture by mixing asphalt particles and a petroleum resin; (b) preparing emulsified water by mixing water and an emulsifier; (c) preparing emulsified asphalt by mixing the asphalt mixture and emulsified water; (d) preparing a modified emulsified asphalt by mixing rubber particles with the emulsified asphalt; may include.

In step (a), an asphalt mixture may be prepared by including 3 to 15 parts by weight of petroleum resin based on 100 parts by weight of asphalt particles.

The content of the petroleum resin may be 3 to 15 parts by weight based on 100 parts by weight of the asphalt particles, for example, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight It may be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight or 15 parts by weight, but is not limited thereto. If the content of the petroleum resin is less than 3 parts by weight, non-adhesiveness may be reduced, and if it is greater than 15 parts by weight, stability between compositions may be reduced, and durability of the modified emulsified asphalt composition may be reduced.

As an example, the petroleum resin, the petroleum resin and the softener may be softened in a weight ratio of 1: 0.01 to 1. After pre-mixing the petroleum resin and the softener, the mixture may be mixed with asphalt particles to more easily coat the petroleum resin on the asphalt particles. The softening agent can activate the softening action of the petroleum resin having a hard property so that the petroleum resin can be evenly coated on the surface of the asphalt particles without agglomeration. For example, when the petroleum resin and the softener are pre-mixed and added to the asphalt particles, the rapid setting of the modified emulsified asphalt composition can be significantly improved compared to mixing the petroleum resin and the softener separately with the asphalt particles. there is. The types of softeners are as described above.

The asphalt mixture may further include 0.1 to 6 parts by weight of an additive based on 100 parts by weight of the asphalt particles. The additive may enable the petroleum resin to be evenly mixed and coated with the asphalt particles. The type of the additive may be one selected from an activation promoter, a regeneration additive, an anti-stripping agent, and a combination of two or more of these, but is not limited thereto. The content of the additive is, for example, 0.1 part by weight, 0.2 part by weight, 0.3 part by weight, 0.4 part by weight, 0.5 part by weight, 0.6 part by weight, 0.7 part by weight, 0.8 part by weight, 0.9 part by weight, 1 part by weight, 2 parts by weight. It may be part, 3 parts by weight, 4 parts by weight, 5 parts by weight or 6 parts by weight, but is not limited thereto.

In the step (b), emulsified water may be prepared by including 1 to 5 parts by weight of an emulsifier based on 100 parts by weight of water. As an example, the emulsifier may be fatty acid salts, for example, tall oil fatty acid. The characteristics of the tall oil fatty acids and the effects thereof are as described above. The content of the emulsifier may be 1 to 5 parts by weight, for example, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight or 5 parts by weight, but is not limited thereto.

In the above manufacturing method, step (b) may be performed after step (a), step (a) may be performed after step (b), or step (a) and step (b) may be performed simultaneously.

In step (b), emulsified water may be prepared by further including calcium chloride and hydrochloric acid, and 0.1 to 1.5 parts by weight of calcium chloride and 0.01 to 0.3 parts by weight of hydrochloric acid may be added to 100 parts by weight of water. no.

The calcium chloride and hydrochloric acid may be included in the emulsified water to play a role in adjusting the pH. The pH can be adjusted in the range of 1 to 4, and the stability of the emulsified water can be improved. The amount of calcium chloride may be 0.1 to 1.5 parts by weight. For example, 0.1 part by weight, 0.2 part by weight, 0.3 part by weight, 0.4 part by weight, 0.5 part by weight, 0.6 part by weight, 0.7 part by weight, 0.8 part by weight, 0.9 part by weight, 1 part by weight, 1.1 part by weight, 1.2 part by weight Part, 1.3 parts by weight, 1.4 parts by weight or 1.5 parts by weight may be, but is not limited thereto.

In addition, the content of the hydrochloric acid may be 0.01 to 0.3 parts by weight. For example, 0.01 part by weight, 0.02 part by weight, 0.03 part by weight, 0.04 part by weight, 0.05 part by weight, 0.06 part by weight, 0.07 part by weight, 0.08 part by weight, 0.09 part by weight, 0.1 part by weight, 0.2 part by weight, or 0.3 part by weight. It may be negative, but is not limited thereto. The calcium chloride and hydrochloric acid are included in an amount within the above range so that the subsequent steps of preparing emulsified asphalt and preparing modified emulsified asphalt can be stably performed.

In step (c), emulsified asphalt may be prepared by mixing the asphalt mixture of step (a) and the emulsified water of step (b). The asphalt mixture and emulsified water are mixed, and the asphalt particles, petroleum particles, and additives are dispersed in the emulsified water to prepare emulsified asphalt. In the step (c), the petroleum particles may be coated on at least a part of the surface of the asphalt particles to prepare emulsified asphalt. The step (c) may be to prepare emulsified asphalt by mixing the softened petroleum resin with straight asphalt in a static mix method.

As an example, step (c) may be performed with a colloid mill. The asphalt mixture prepared in step (a) and the emulsified water prepared in step (b) are put into a colloid mill to cause an emulsification reaction by a mechanical method under the condition of MILL SPEED 2500 to 3500, and uniformly dispersed to obtain emulsified asphalt. can be manufactured.

In step (d), the modified emulsified asphalt composition may be prepared by mixing 1 to 8 parts by weight of the rubber particles with respect to 100 parts by weight of the modified emulsified asphalt composition. The rubber particles may be dispersed in the emulsified asphalt and combined with at least a portion of the petroleum resin coated on a portion of a surface of the asphalt particle. Non-adhesiveness of the rubber particles may be improved by binding to the petroleum resin instead of directly to the surface of the asphalt particles.

The rubber particles may be, for example, cationic latex or styrene-butadiene rubber (SBR) latex. As a non-limiting example, the styrene-butadiene rubber latex may have a viscosity of 1,000 to 1,800cps at 25°C. For example, the viscosity of the styrene-butadiene rubber latex at 25° C. may be 1,000cps, 1,100cps, 1,200cps, 1,300cps, 1,400cps, 1,500cps, 1,600cps, 1,700cps or 1,800cps, but is not limited thereto . When the viscosity of the styrene-butadiene rubber latex falls within the above range, the curing rate of the modified emulsified asphalt composition containing the styrene-butadiene rubber latex can be stably improved, and durability can be improved while having excellent non-adhesiveness.

As an example, the rubber particles may be prepared by mixing the rubber particles with an additive mixture in which water and additives are mixed in a weight ratio of 1:1.5 to 5. The types and effects of the additives are as described above.

For example, the additive may be mixed with water at 40 to 80° C., diluted in the form of an additive mixture, and then mixed with rubber particles. The water and additives may be diluted in a weight ratio of 1:1.5 to 5. Functionality may be imparted to the rubber particles by mixing the additive mixture and the rubber particles, and thus, highly functional rubber particles may be formed.

The content of the rubber particles may be 1 to 8 parts by weight based on 100 parts by weight of the modified emulsified asphalt composition. For example, it may be 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight or 8 parts by weight, but is not limited thereto. If the content of the rubber particles is less than 1 part by weight, the curing speed and durability may be reduced, and if it is more than 8 parts by weight, stability between the asphalt particles, the petroleum resin and the rubber particles is reduced due to excessive content of the rubber particles, thereby reducing the amount of the modified emulsified asphalt composition. properties may deteriorate.

In a non-limiting example, steps (a) and (d) may be performed with a static mixer, but are not limited thereto. The static mixer can be continuously kneaded only by passing through the tube without a rotating part or special power. For example, in the step (a), an asphalt mixture may be prepared by introducing a pre-mixed mixture of asphalt particles, a petroleum resin, and a softener into a static mixer. In addition, in step (d), a modified emulsified asphalt composition may be prepared by adding high-functionality rubber particles to the emulsified asphalt in a static mixer.

Hereinafter, the embodiments of the present specification will be described in more detail. However, the following experimental results are only representative experimental results among the above examples, and cannot be interpreted as the scope and contents of the present specification are reduced or limited by the examples. Each effect of the various embodiments of the present specification that is not explicitly presented below is to be described in detail in the corresponding section.

Example 1

In the first mixer, 10 parts by weight of coumaron-indene resin having a softening point of 95 ° C., 1.2 parts by weight of an activation promoter, 1.5 parts by weight of a regeneration additive and 0.5 parts by weight of an anti-stripping agent were added to 100 parts by weight of straight asphalt in the first mixer, and the mixture was stirred at a temperature of 120 ° C. for 60 minutes. While stirring to prepare an asphalt mixture.

3 parts by weight of tall oil fatty acids, 1 part by weight of calcium chloride, and 0.9 parts by weight of hydrochloric acid were added to a second mixer based on 100 parts by weight of water, and stirred at a temperature of 50° C. for 60 minutes to prepare emulsified water.

The prepared asphalt mixture and emulsified water were put into a colloid mill that is mixed at a high speed of 3,000 rpm and stirred at a temperature of 35 ° C. for 30 minutes to prepare emulsified asphalt.

After preparing emulsified asphalt, 3.5 parts by weight of styrene-butadiene rubber (SBR) latex having a viscosity of 1,500 cps at 25 ° C was added to a colloid mill, and mixed at a high speed of 3,000 rpm / min for 30 minutes at a temperature of 30 ° C to modify emulsification An asphalt composition was prepared.

Example 2

A petroleum resin mixture was prepared by mixing 8 parts by weight of a C9 petroleum resin having a softening point of 155 ° C and 2 parts by weight of a coumaron-indene resin having a softening point of 95 ° C in a first mixer. 10 parts by weight of the petroleum resin mixture prepared in 100 parts by weight of straight asphalt, 1.2 parts by weight of an activator, and 0.5 parts by weight of an anti-stripping agent were added to a static mixer and stirred at a temperature of 120 ° C. for 60 minutes to prepare an asphalt mixture.

Emulsified water was prepared by adding 3 parts by weight of tall oil fatty acid, 1 part by weight of calcium chloride, and 0.9 part by weight of hydrochloric acid to 100 parts by weight of water in a second mixer and stirring at a temperature of 50° C. for 60 minutes.

After preparing an additive mixture by mixing water and additives in a ratio of 1: 2 in a third mixer, it is added to styrene-butadiene rubber (SBR) latex having a viscosity of 1,500 cps at 25 ° C and stirred to obtain high-functional rubber particle latex was manufactured.

The asphalt mixture and the emulsified water were put into a colloid mill that was mixed at a high speed of 3,000 rpm and stirred at a temperature of 35 ° C. for 30 minutes to prepare emulsified asphalt. A modified emulsified asphalt composition was prepared by adding 3.5 parts by weight of high-functional rubber particle latex to the emulsified asphalt and mixing at a high speed of 3,000 rpm for 30 minutes at a temperature of 30 °C.

Comparative Example 1

A modified emulsified asphalt composition was prepared in the same manner as in Example 1, except that the asphalt mixture was prepared by omitting the coumarone-indene resin.

Comparative Example 2

A modified emulsified asphalt composition was prepared in the same manner as in Example 1, except that the rubber particles were changed to 3.5 parts by weight of styrene-butadiene-styrene.

Comparative Example 3

A modified emulsified asphalt composition was prepared in the same manner as in Example 1, except that 3 parts by weight of ethanolamine was included as an emulsifier.

Comparative Example 4

A modified emulsified asphalt composition was prepared in the same manner as in Example 1, except that styrene-butadiene rubber (SBR) latex was added to the first mixer.

Experimental Example 1: Property Evaluation 1 of Modified Emulsified Asphalt

In order to evaluate the non-adhesion of the modified emulsified asphalt composition prepared according to Examples and Comparative Examples, an adhesion test was conducted.

The adhesion test was cured after applying the modified emulsified asphalt compositions of Examples and Comparative Examples on the surface of the asbestos packing. A rubber plate of the same material as the tire of the dump truck was laid on the cured modified emulsified asphalt, and after driving the roller with a constant load, the rubber plate was removed, and the amount of the rubber plate was calculated according to the following formula, and the results are shown in Table 1 .

-Adhesion rate (%): (Weight of modified emulsified asphalt on rubber board/amount of modified emulsified asphalt applied to asbestos packing) X 100

구분division	부착률(%)Adhesion rate (%)
실시예 1Example 1	6.26.2
실시예 2Example 2	3.43.4
비교예 1Comparative Example 1	30.130.1
비교예 2Comparative Example 2	21.521.5
비교예 3Comparative Example 3	22.922.9
비교예 4Comparative Example 4	17.317.3

Referring to Table 1, it can be confirmed that the adhesion rates of the modified emulsified asphalt compositions of Examples 1 and 2 were 6.2% and 3.4%, respectively, and the non-adhesiveness was significantly improved compared to the comparative example. It can be seen that the modified emulsified asphalt composition of Example has improved durability so that the asphalt particles, the coumarone-indene resin, and the styrene-butadiene rubber latex have excellent bonding strength, so that they are not easily separated even under high external pressure. In particular, the modified emulsified asphalt composition of Example 2 showed the best adhesion rate. It can be confirmed that the modified emulsified asphalt composition of Example 2 has the most excellent durability and non-adhesiveness in that it is pre-mixed with a softener and coated with a petroleum resin and modified with high-functional rubber latex. The modified emulsified asphalt composition of Comparative Example exhibited a decrease in non-adhesiveness due to a high adhesion rate, and in particular, it can be confirmed that durability of Comparative Example 1 in which rubber particles are directly bonded to asphalt particles is most decreased. In Comparative Example 4, non-adhesiveness may not be realized because the petroleum resin is not coated on the surface of the asphalt particles.

Experimental Example 2: Property Evaluation 2 of Modified Emulsified Asphalt

The physical properties of the modified emulsified asphalt compositions prepared according to Examples and Comparative Examples were evaluated, and the results are shown in Table 2.

- Angler degree viscosity: measured according to KS M 2203.

- Penetration Index (dm): Penetration of 1/10 mm of a needle when a weight of 100 g is pressed with a needle for 5 seconds at 25 ° C under standard conditions was measured as penetration 1.

- Softening point (℃): measured according to KS M 2250.

- Touch drying time: It means the time to reach a state in which the asphalt composition does not adhere to the finger, although there is adhesiveness when lightly applied with a finger on the dry surface.

구분division	앵글러도 점도(25℃)Angler degree viscosity (25℃)	침입도 (dm)Penetration (dm)	연화점(℃)Softening point (℃)	지촉건조시간(분)Touch dry time (minutes)
실시예 1Example 1	2.62.6	7676	5858	3838
실시예 2Example 2	2.12.1	8585	6262	2727
비교예 1Comparative Example 1	5.75.7	3434	4848	7575
비교예 2Comparative Example 2	3.63.6	6464	5252	5252
비교예 3Comparative Example 3	3.43.4	5757	5353	5959

Referring to Table 2, it can be seen that the viscosity of the modified emulsified asphalt composition of Example is lower than that of Comparative Example, and the penetration rate and softening point are excellent, so that the curing rate is improved compared to the conventional emulsified asphalt. In particular, the curing speed of the modified emulsified asphalt composition of Example 2 is improved, and the touch drying time is 27 minutes, which is the shortest drying time, so it can be predicted that the hardening speed is fast and the work can be done quickly when applied to road pavement. On the other hand, it can be predicted that the modified emulsified asphalt composition of Comparative Example has higher viscosity and lower penetration and softening point than those of Example, so that it is not suitable for paved roads requiring short working time.

The above description of the present specification is for illustrative purposes, and those skilled in the art to which one aspect of the present specification pertains can easily be modified into other specific forms without changing the technical spirit or essential features described in the present specification. you will be able to understand Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

Claims

A method for producing a modified emulsified asphalt composition in which 1 to 8 parts by weight of the rubber particles are mixed with respect to 100 parts by weight of the modified emulsified asphalt composition.
According to claim 1,

The modified emulsified asphalt composition includes 57 to 73 parts by weight of asphalt particles, 1 to 8 parts by weight of rubber particles, 0.5 to 12 parts by weight of petroleum resin, 30 to 40 parts by weight of water, and 0.5 to 1.5 parts by weight of an emulsifier.
According to claim 1,

The rubber particle is a modified emulsified asphalt composition of styrene-butadiene rubber (SBR) latex.
According to claim 1,

The modified emulsified asphalt composition wherein the rubber particles are functionalized with an additive.
According to claim 4,

The modified emulsified asphalt composition wherein the additive is octylphenol ethoxylate.
According to claim 1,

The emulsifier is a tall oil fatty acid modified emulsified asphalt composition.
According to claim 1,

The petroleum resin is a modified emulsified asphalt composition of coumarone-indene resin, C9 petroleum resin, or a mixture thereof.
According to claim 1,

The modified emulsified asphalt composition wherein the petroleum resin is softened with a softening agent.
(a) preparing an asphalt mixture by mixing asphalt particles and petroleum resin;

(b) preparing emulsified water by mixing water and an emulsifier;

(c) preparing emulsified asphalt by mixing the asphalt mixture and emulsified water; and

(d) preparing a modified emulsified asphalt by mixing rubber particles with the emulsified asphalt;
According to claim 9,

The petroleum resin,

A method for producing a modified emulsified asphalt composition in which a petroleum resin and a softener are softened in a weight ratio of 1: 0.01 to 1.
According to claim 9,

The asphalt mixture,

A method for producing a modified emulsified asphalt composition comprising 3 to 15 parts by weight of petroleum resin based on 100 parts by weight of asphalt particles.
According to claim 9,

The emulsified water,

A method for producing a modified emulsified asphalt composition comprising 1 to 5 parts by weight of an emulsifier based on 100 parts by weight of water.
According to claim 9,

The rubber particles,

A method for producing a modified emulsified asphalt composition prepared by mixing rubber with an additive mixture in which water and additives are mixed in a weight ratio of 1: 1.5 to 5.
According to claim 9,

A method for producing a modified emulsified asphalt composition in which 1 to 8 parts by weight of the rubber particles are mixed with respect to 100 parts by weight of the modified emulsified asphalt composition.
According to claim 9,

The step (c) is a method for producing a modified emulsified asphalt composition performed with a colloid mill.