KR102722087B1 - Petroleum resin binder applied to recycled aggregate for auxiliary base layer - Google Patents

Abstract

The present invention relates to a petroleum resin binder applied to a recycled aggregate for a subbase layer, comprising: water; a petroleum resin; waste plastic; a liquefier for liquefying the waste plastic; and an emulsifier for emulsifying the water, the petroleum resin, and the liquefied waste plastic, wherein the petroleum resin and the liquefied waste plastic exist as colloidal particles in the water. According to this, since a petroleum resin binder to which liquefied waste plastic prepared through a room temperature liquefaction treatment is added can be manufactured, a petroleum resin binder having environmental friendliness due to recycling of waste plastic in addition to the environmental friendliness of the petroleum resin can be provided.

Description

{PETROLEUM RESIN BINDER APPLIED TO RECYCLED AGGREGATE FOR AUXILIARY BASE LAYER}

The present invention relates to a petroleum resin binder applied to a recycled aggregate for a subbase layer, and to a petroleum resin binder manufactured using waste plastic.

Waste plastics, which have been continuously generated since industrialization, have recently increased exponentially, and are being pointed out as a major factor in environmental pollution and ecosystem destruction. Up until now, waste plastics have been processed by exporting them to developing countries including China, but due to export regulations in the target countries, even this has become difficult, and so methods for processing waste plastics through recycling are being sought.

In particular, cases of recycling waste plastics in the road paving sector are increasing because road paving involves large-scale construction and the number of construction projects is higher than in other sectors, so a significant amount of waste plastics can be recycled and processed.

As an example of its use in road paving, there is the case where solid waste plastic is processed at high temperatures to obtain liquefied waste plastic, which is then added to the production of emulsified asphalt binder. Adding waste plastic can help improve the properties of the binder and reduce the proportion of harmful asphalt used, which can further improve environmental friendliness.

However, since high-temperature treatment of solid waste plastics generates harmful gases, causing air pollution, and asphalt is still used as the main material for binders, emulsified asphalt binders using solid waste plastics have limitations in improving environmental friendliness.

Therefore, there is a growing need for an environmentally friendly binder that does not use asphalt and can recycle waste plastic in an environmentally friendly manner.

Accordingly, the purpose of the present invention is to provide a petroleum resin binder applied to a subbase recycled aggregate, which has environmental friendliness due to recycling of waste plastic in addition to the environmental friendliness of the petroleum resin by adding liquefied waste plastic prepared through room temperature liquefaction treatment.

The above-mentioned object of the present invention is a petroleum resin binder applied to a recycled aggregate for a subbase layer, comprising: water; petroleum resin; waste plastic; a liquefier for liquefying the waste plastic; and an emulsifier for emulsifying the water, the petroleum resin, and the liquefied waste plastic, wherein the petroleum resin and the liquefied waste plastic can be achieved by the petroleum resin binder existing in the water as colloidal particles.

According to this, since it is possible to manufacture a petroleum resin binder by adding liquefied waste plastic prepared through room temperature liquefaction treatment, it is possible to provide a petroleum resin binder that has environmental friendliness through recycling of waste plastic in addition to the environmental friendliness of the petroleum resin.

The above liquefying agent includes a hydrophilic solvent. Accordingly, a petroleum resin binder having a further improved emulsification degree of liquefied waste plastic in water can be provided compared to when a hydrophilic solvent is used.

The emulsifier comprises sodium hydroxide which enhances the emulsifying power between the water, the petroleum resin and the liquefied waste plastic. Accordingly, a petroleum resin binder having a further enhanced emulsifying power of the liquefied waste plastic and the petroleum resin in water can be provided.

It is manufactured with 30 to 80 parts by weight of the water, 20 to 70 parts by weight of the petroleum resin, 20 to 50 parts by weight of the waste plastic, 10 to 15 parts by weight of the liquefier, and 0.5 to 10 parts by weight of the emulsifier. According to this, a petroleum resin binder with improved convenience and usability can be provided.

The above-described object of the present invention can also be achieved by a step of mixing two or more different kinds of liquefied waste plastics with a petroleum resin; a step of mixing the mixed petroleum resin and the two or more liquefied waste plastics with water together with an emulsifier to produce a petroleum resin binder; and a step of mixing at least one molten waste plastic-coated recycled aggregate and the manufactured petroleum resin binder to produce regenerated asphalt.

According to this, since a large amount of waste plastic can be used to coat the recycled aggregate, the environmental friendliness of recycling waste plastic can be further improved.

According to the present invention, by adding liquefied waste plastic prepared through room temperature liquefaction treatment to a petroleum resin binder applied to a recycled aggregate for a subbase layer, a petroleum resin binder having environmental friendliness due to recycling of waste plastic in addition to the environmental friendliness of the petroleum resin can be provided.

FIG. 1 illustrates a composition of a petroleum resin binder and recycled asphalt according to one embodiment of the present invention.
Figure 2 illustrates the manufacturing process of a petroleum resin binder and recycled asphalt.
Figure 3 illustrates an experimental example for confirming the degree of reduction in hazardous substances in relation to the petroleum resin binder of Figure 1.
Figure 4 illustrates an experimental example for confirming the degree of improvement in emulsification by a hydrophilic liquefying agent in relation to the petroleum resin binder of Figure 1.
Figure 5 illustrates an experimental example for confirming the degree of improvement in emulsification by a natural emulsifier and an emulsifying assistant in relation to the petroleum resin binder of Figure 1.
FIG. 6 illustrates a composition of a petroleum resin binder and recycled asphalt according to another embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. This is intended to describe in detail enough to enable a person having ordinary knowledge in the technical field to which the present invention belongs to to easily carry out the invention, and it is to be understood that the technical idea and scope of the present invention are not limited thereby.

FIG. 1 illustrates a composition of a petroleum resin binder and recycled asphalt according to one embodiment of the present invention.

The petroleum resin binder (20) according to the present embodiment is a mixture that is applied to the recycled aggregate (10) so that the recycled aggregate (10) can be recycled as regenerated asphalt concrete (15) for a subbase layer. Here, the subbase layer is a component of multiple layers forming a paved road and is located in the middle of the base layer and the subgrade. The subbase layer disperses the traffic load transmitted from the upper surface layer and the base layer and transmits it to the subgrade, and prevents fine particles of the subgrade soil from penetrating the base layer. In addition, it acts as a waterproof layer that prevents the penetration and stagnation of moisture between the base layer and the subgrade, thereby minimizing damage to the pavement structure due to moisture freezing. However, the recycled aggregate (10) is not limited to the recycled asphalt concrete (15) for a subbase layer, and may be recycled for a surface layer, a base layer, etc., depending on the situation.

Recycled aggregate (10) is obtained by crushing waste asphalt, construction waste, etc. In particular, in the case of recycled aggregate (10) crushed from waste asphalt, the properties required for subbase are reduced due to oxidation by oxygen in the air for a long period of time, molecular cutting by ultraviolet rays, drying due to evaporation of asphalt, etc., and therefore, it is necessary to supplement the properties.

In addition, when the recycled aggregate (10) crushed from waste asphalt is used as is, a large amount of environmental hormones such as benzopyrene are released from the aged asphalt remaining on the surface of the recycled aggregate (10). If the leakage of environmental hormones contaminates living water through rainwater or pollutes the air through the wind, it can seriously result in causing many cancer patients in nearby residences. Therefore, it is necessary to block the source of environmental pollution.

Therefore, for these reasons of performance restoration and environmental improvement, recycled aggregate (10) is applied as a binder and recycled in road pavement for subbase. However, although asphalt binder helps in performance restoration, toxic substances such as carbon monoxide (CO) and hydrogen sulfide ( _H2S ) are emitted during the manufacturing and management process, and if used in road pavement for subbase, there is still a risk of environmental hormones being released due to rainwater, etc.

In order to overcome the harmfulness of asphalt binder, the petroleum resin binder (20) according to the present embodiment uses petroleum resin (12) that is environmentally friendly compared to asphalt binder, and is manufactured so that the petroleum resin (12) is dispersed in water (11) as colloidal particles. In particular, since the petroleum resin (12) can be mixed with recycled aggregate (10) at room temperature, it is not subject to temperature constraints. The petroleum resin (12) will be described in more detail later.

In addition, since the petroleum resin binder (20) according to the present embodiment is manufactured using waste plastic, the environmental friendliness due to the use of petroleum resin (12) can be further improved. Waste plastic is relatively stable at high temperatures and can not only improve the adhesiveness between recycled aggregates (10), but also helps with the elasticity between recycled aggregates (10), so it also acts advantageously to improve durability.

In particular, waste plastic utilized in the petroleum resin binder (20) is liquefied waste plastic (3) in which room temperature liquefaction treatment is performed on solid waste plastic (1) using a liquefying agent (2). The liquefied waste plastic (3) manufactured through the room temperature liquefaction treatment is emulsified in water (11) together with the petroleum resin (12) so that it exists dispersed as colloidal particles in the water (11). Hereinafter, with reference to FIG. 1, the composition of the petroleum resin binder (20) manufactured using the petroleum resin (12) and the liquefied waste plastic (3) and the manufacturing process of the petroleum resin binder (20) will be described in more detail.

The solid waste plastic (1) is composed of a plastic resin having a solid form and refers to a thermoplastic resin. For example, the solid waste plastic (1) includes at least one of poly amide, poly vinyl chloride (PVC), acrylonitrile butadiene styrene (ABS), poly styrene, poly styrol, poly ethylene, poly urethane, methyl methacrylate, poly butadiene, an ethylene-butene copolymer, an ethylene-octene copolymer, a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, or an elastomer. The solid waste plastic (1) may be any one of the various thermoplastic plastic resins described above, or a combination thereof. Of course, the types of the solid waste plastic (1) are not limited to those described above, so waste plastics of various components may be used as long as they have thermoplastic properties.

Solid waste plastic (1) can be obtained from a waste plastic collection plant. Typically, waste plastic collection plants first separate and collect waste plastic from recycling bins and recycling centers scattered throughout the country, and then secondarily classify the separated waste plastic into more precise categories by size, type, color, and composition. Then, the classified waste plastic is cut into solids such as chips or pellets for easy storage and recycling. The solid waste plastic (1) used in this embodiment is brought in after being cut at a waste plastic collection plant, and may have been washed to remove foreign substances on the outside, if necessary.

The liquefier (2) is a solvent used for room temperature liquefaction treatment of solid waste plastic (1). Therefore, even if the solid waste plastic (1) is changed into liquefied waste plastic (3) by the liquefier (2), the properties of the plastic resin are maintained as is, and only the particles of the plastic resin are decomposed.

The liquefier (2) includes a hydrophilic solvent. For example, the hydrophilic solvent may include acetone, methyl ethyl ketone, etc. The hydrophilic solvent enables room temperature liquefaction treatment of solid waste plastic (1) and has excellent solubility in water (11). On the other hand, lipophilic solvents or bipolar solvents such as toluene, benzene, etc., even though they enable room temperature liquefaction treatment of solid waste plastic (1), have low solubility in water (11) compared to the hydrophilic solvent. The solubility in water (11) is related to the emulsification degree of the liquefied waste plastic (3) in water (11) described below, which will be described in detail in the relevant section.

Since the liquefied waste plastic (3) may contain various impurities, even if the waste plastic has been washed, it may be additionally subjected to a purification process. For example, the liquefied plastic (3) may be purified using sulfuric acid and sulfuric clay. When sulfuric acid is added to the liquefied plastic (3), the sulfuric acid burns and settles the impurities in the liquefied plastic (3), and the impurities are precipitated together with the residual sulfuric acid in the lower layer of the liquefied plastic (3). When activated clay is additionally added, the activated clay may adsorb and precipitate the impurities that were not removed by the sulfuric acid. The residual sulfuric acid or sulfuric clay and the precipitated impurities are removed from the liquefied plastic (3) through centrifugation, and a high-purity liquefied plastic (3) can be obtained through the centrifugation process. However, the method for removing impurities in the liquefied plastic (3) is not limited to the above and may be variously provided.

Petroleum resin binder (20) is manufactured by mixing water (11), petroleum resin (12), and liquefied waste plastic (3). Water (11) is a dispersion medium for petroleum resin (12), and can be prepared to have a neutral pH of 7 so that petroleum resin binder (20) can be manufactured more easily. Purified water, distilled water, etc. can be used as water (11).

Petroleum resin (12) is a dispersant that is dispersed in water (11) and exists as colloidal particles. Petroleum resin (12) is an oil fraction obtained as a by-product of the petroleum refining process or the petrochemical industry, and is made of raw materials containing olefin or diolefin. The petroleum resin (12) may be an aromatic or aliphatic resin, or a combination thereof. As an example, the petroleum resin (12) includes HIKOTACK® P-90 of KOLON INDUSTRIES ^TM . HIKOTACK® P-90 is an aromatic C9 petroleum resin, and is a light yellow thermoplastic resin obtained through the polymerization of aromatic olefin generated in the naphtha thermal cracking process.

Petroleum resin (12) coats the surface of the recycled aggregate (10) so that the recycled aggregate (10) has properties as a sub-base layer, thereby improving strength, wear resistance, erosion resistance, durability, adhesiveness, and stickiness. In addition, it covers the aged surface of the recycled aggregate (10) and asphalt, thereby fundamentally blocking environmental pollutants that may leak out from it.

The petroleum resin binder (20) includes an emulsifier (4). The emulsifier (4) may be an anionic emulsifier used for emulsifying water (11), petroleum resin (12), and liquefied waste plastic (3). That is, the emulsifier (4) is selected to have an anionic property in consideration of not only the emulsification degree of the petroleum resin (12) in water (11) but also the emulsification degree of the liquefied waste plastic (3) in water (11). For example, fatty acid salts, carbonate salts, sulfuric acid ester salts, sulfonate salts, phosphoric acid ester salts, SS-1, SS-1H, etc. may be used as the emulsifier (4).

In the case of anionic emulsifiers, since the emulsifying property for water (11) is excellent, the solubility of petroleum resin (12) and liquefied waste plastic (3) in water (11) can be improved. In addition, when anionic emulsifiers are used, the phenomenon of the plastic resin of the petroleum resin (12) and liquefied waste plastic (3) being peeled off from water (11) can be prevented. On the other hand, in the case of cationic emulsifiers, since the emulsifying property for water (11) is inferior to that of anionic emulsifiers, not only is the curing period of the petroleum resin binder (20) prolonged, but also the peeling phenomenon of the petroleum resin (12) and the plastic resin can be caused.

In this way, the petroleum resin binder (20) according to the present embodiment is not only more environmentally friendly than when asphalt is used in that it uses petroleum resin (12), but also, since the petroleum resin (12) is dispersed in water (11) and exists as colloidal particles and can be mixed with recycled aggregate (10) at room temperature, it is more convenient to use than a simple heating mixing method that heats asphalt at high temperatures and applies it to road paving, and can be easily utilized at work sites.

In addition, there may be cases where liquefied waste plastic (23 in FIG. 3) obtained through high-temperature melting treatment of solid waste plastic (1) is mixed with petroleum resin (12), but since the high-temperature melting treatment process of 200 degrees Celsius or higher may emit toxic gases that cause asphyxiation, such as hydrogen chloride (HCl) and hydrogen cyanide (HCN), and formaldehyde (HCHO), which causes atopy, the utilization of waste plastic may undermine the purpose of environmental improvement through petroleum resin (12).

As in this embodiment, by using liquefied waste plastic (3) obtained by subjecting solid waste plastic (1) to room temperature liquefaction treatment, the generation of toxic gases that are fatal to the human body can be prevented, and thus a petroleum resin binder (20) with improved environmental friendliness due to the use of petroleum resin (12) can be provided.

According to various embodiments, the petroleum resin binder (20) includes an emulsifying agent (6) that increases the solubility of the emulsifier (4) in water (11). For example, the emulsifying agent (6) includes sodium hydroxide. Sodium hydroxide induces the emulsifier (4) to have an anion, thereby allowing the emulsifier (4) to have higher solubility in water (11). When the solubility of the emulsifier (4) in water (11) increases, the solubility of the petroleum resin (12) and liquefied waste plastic (3) in water (11) also improves, thereby preventing agglomeration of the petroleum resin (12) and liquefied waste plastic (3) existing as colloidal particles in water (11) and helping to maintain a dispersed state.

According to various embodiments, the emulsifier (4) includes a natural emulsifier (5) including a natural resin component. The natural resin component may be extracted from a natural tree or natural resin. For example, it may be manufactured based on a resin extracted from a copaiba tree, a carnauba palm tree, a Brazil nut tree, etc., but is not limited thereto, and may be manufactured based on a resin extracted from various forests in tropical regions.

Natural emulsifier (5) is superior in environmental friendliness and biocompatibility compared to emulsifiers containing organic compounds, and has high solubility in water (11), so it can be easily diluted in water (11) even at room temperature. If sodium hydroxide is used together or a liquefaction treatment is performed on a natural resin component to prepare a liquefied emulsifier, the solubility and dilution of the natural emulsifier (5) in water (11) can be further improved.

As a natural emulsifier (5), emulsifen G5000 from POLYTRADE ^TM can be used. G5000 is not only environmentally friendly compared to organic compound emulsifiers because it has a small impact on the soil ecosystem, but also has a low manufacturing cost, so it has high efficiency in terms of cost. When G5000 is used, octylphenol ethoxylate can be added as an emulsifying auxiliary agent (6) to improve the emulsifying power of G5000. Octylphenol ethoxylate can be a product of TRITON ^TM with HLB 17.6 (e.g., X-405).

In this way, when manufacturing a petroleum resin binder (20) with added liquefied waste plastic (3), if a natural emulsifier (5) is used, not only is the environmental friendliness improved through recycling, but biocompatibility can also be further improved compared to when an emulsifier containing an organic compound component is used.

In addition, when a natural emulsifier (5) is used, adding an emulsifying auxiliary agent (6) such as octylphenol ethoxylate can more easily improve the emulsification degree between water (11), petroleum resin (12), and liquefied waste plastic (3) by the natural emulsifier (5). Of course, since the emulsification degree can be improved by adjusting the solubility with sodium hydroxide, octylphenol ethoxylate and sodium hydroxide can be used together to improve the emulsification degree.

According to various embodiments, the petroleum resin binder (20) may include an anti-stripping agent as an additive (7). When the petroleum resin binder (20) is applied to the recycled aggregate (10) and moisture evaporates, the petroleum resin (12) and the plastic resin of the liquefied waste plastic (3) remain coated on the recycled aggregate (10). However, when moisture evaporates, the petroleum resin (12) and the plastic resin may peel off from the surface of the recycled aggregate (10), and the anti-stripping agent serves to prevent this peeling phenomenon. The peeling phenomenon may also occur due to the aging of the petroleum resin (12) and the plastic resin over time, and the anti-stripping agent can improve the adsorption durability of the petroleum resin (12) and the plastic resin, and thus can prevent peeling due to the passage of time and aging.

It is preferable that the anti-stripping agent be prepared as a heat-resistant component. For example, the anti-stripping agent is an anionic anti-stripping agent, and includes fatty acid-based, straight-chain alkyl benzene-based, alpha-olefin-based, normal paraffin-based, etc. Fatty acid-based agents include fatty acid salts, alpha-sulfonated fatty acid ester salts, etc., and straight-chain alkyl benzene-based agents include straight-chain alkyl benzene sulfonates. Alpha-olefin-based agents and normal paraffin-based agents include alpha-olefin sulfonates and alkyl sulfonates.

According to various embodiments, the additive (7) includes a water-based acrylic emulsion adhesive. The water-based acrylic emulsion adhesive is used to improve the adhesion between the petroleum resin (12) and the recycled aggregate (10) by the plastic resin.

The water-based acrylic emulsion adhesive contains an acrylic component as its main component, and by cross-linking a styrene monomer used as an adhesive strength regulator and an N-methylol acrylamide monomer used as a heat-resistant agent with acrylic acid, the surface adhesion of a petroleum resin (12) to a recycled aggregate (10) is improved, and by the adhesive strength, water resistance, wear resistance, light resistance, elasticity resistance, fire resistance, chemical resistance, soundproofing, and thermal insulation can be improved.

According to various embodiments, the petroleum resin binder (20) includes an auxiliary resin (8) for improving adhesion. The auxiliary resin (8) for improving adhesion is for improving adhesion between the recycled aggregate (10) by the petroleum resin (12), and includes at least one of rosin and rosin ester. The auxiliary resin (8) can be added to the petroleum resin (12) before the petroleum resin (12) is mixed with water (11).

However, since the natural emulsifier (5) can also perform the function of improving adhesion, if the required adhesion is achieved only with the natural emulsifier (5) depending on the road paving environment, the auxiliary resin (8) for improving adhesion may be omitted.

In this way, by using a water-based acrylic emulsion adhesive and auxiliary resin (8) as additives (7), the adhesiveness and tackiness by the petroleum resin (12) can be further improved.

Referring again to FIG. 1, water (11), petroleum resin (12), and liquefied waste plastic (3) are mixed together with the above-mentioned emulsifier (4), etc. The mixing process can be performed at high speed by a mixing device (13) such as a colloid mill. Through the mixing process, the petroleum resin (12) and the plastic resin of the liquefied waste plastic (3) exist as colloidal particles having an average particle diameter of 1 to 5 ㎛. During the mixing process, charges are imparted to the surfaces of the petroleum resin (12) and the plastic resin, thereby preventing agglomeration between the particles. Since the mixing device (13) is not limited to a colloid mill, a crushing device, a grinder, etc. may be used in addition to or together with the colloid mill.

The mixer (14) mixes the petroleum resin binder (20) and the recycled aggregate (10) prepared through the manufacturing process described above. The stirring process can be performed at room temperature, and the recycled aggregate (10) is applied by the petroleum resin binder (20) through the stirring process. When the recycled aggregate (10) is applied by the petroleum resin binder (20), regenerated asphalt (15) that can be used for road paving, such as for a subbase layer, is prepared.

In order for the recycled aggregate (10) to be recycled as regenerated asphalt concrete (15) for the sub-base layer, it must satisfy the particle size according to the standard specification, which is the quality standard for the sub-base layer. However, depending on the manufacturing environment of the recycled aggregate (10), the particle size range of the recycled aggregate (10) is somewhat wide, between 0.08 mm and 75 mm, so it may be difficult to satisfy the quality standard for the sub-base layer. In this case, the quality standard can be satisfied by appropriately mixing recycled aggregate (10) prepared by at least three types of particle sizes.

Hereinafter, the composition ratio or mixing ratio of each raw material for manufacturing a petroleum resin binder (20) will be described in detail. The petroleum resin binder (20) is composed of 30 to 80 parts by weight of water (11), 20 to 70 parts by weight of petroleum resin (12), 20 to 50 parts by weight of liquefied waste plastic (3), 10 to 15 parts by weight of a liquefier (2), and 0.5 to 10 parts by weight of an emulsifier (4). If sodium hydroxide is included as an emulsifying auxiliary agent (6), 0.1 to 1.0 parts by weight of sodium hydroxide may be included in the above composition.

If the amount of water (11) is less than 30 parts by weight, the concentration of various additives such as emulsifier (4) and petroleum resin (12) becomes thick, so that the mixing resistance may increase, and thus, it may be difficult to manufacture the petroleum resin binder (20). On the other hand, if the amount of water (11) is greater than 80 parts by weight, the concentration of various additives such as emulsifier (4) becomes diluted, so that the intended effect through the additive may not be achieved. For example, the degree of emulsification by the emulsifier (4) may decrease, or the solubility of the emulsifier (4) in water (11) may decrease.

If the petroleum resin (12) is less than 20 parts by weight, the strength of the recycled aggregate (10) may be reduced, and if it is more than 70 parts by weight, the strength may be strengthened too much, causing cracks to occur in the recycled aggregate (10).

If the amount of the liquefier (2) is less than 10 parts by weight, the penetration power may be reduced due to low viscosity, which may reduce the adhesion of the plastic resin to the recycled aggregate (10), and if it is greater than 15 parts by weight, the hardening of the liquefied waste plastic (3) may be delayed.

If the amount of liquefied waste plastic (3) is less than 20 parts by weight, the strength of the recycled aggregate (10) may be reduced, and if it is more than 50 parts by weight, the strength may be strengthened too much, causing cracks to occur in the recycled aggregate (10).

If the emulsifier (4) is less than 0.1 part by weight, the curing period of the petroleum resin binder (20) may be delayed, and if it is greater than 0.5 part by weight, a phase separation phenomenon between water (11), petroleum resin (12), and liquefied waste plastic (3) may occur.

Meanwhile, if the sodium hydroxide is less than 0.1 part by weight, the solubility of the emulsifier (4) in water (11) is not sufficient, so that the curing period of the petroleum resin binder (20) may be delayed, and if it is greater than 1.0 part by weight, a phase separation phenomenon between the water (11), the petroleum resin (12), and the liquefied waste plastic (3) may occur.

With this mixing ratio, the performance as a binder can be improved, so that a petroleum resin binder (20) with improved usability and usability can be provided.

According to various embodiments, the petroleum resin binder (20) is composed of 30 to 80 parts by weight of water (11), 20 to 70 parts by weight of petroleum resin (12), 20 to 50 parts by weight of liquefied waste plastic (3), 10 to 15 parts by weight of a liquefier (2), 0.1 to 0.5 parts by weight of a natural emulsifier (5), 0.1 to 1.0 parts by weight of sodium hydroxide, and 0.1/3 to 0.5/3 parts by weight of octylphenol ethoxylate. The reason why water (11), etc. must be composed in an optimal ratio according to the present embodiment overlaps with the above-described content, and therefore, will be omitted.

If the amount of natural emulsifier (5) is less than 0.1 part by weight, the environmental friendliness is reduced and the curing period of the petroleum resin binder (20) may be delayed, and if it is greater than 0.5 part by weight, a phase separation phenomenon between water (11), petroleum resin (12) and liquefied waste plastic (3) may occur.

If the amount of octylphenol ethoxylate is less than 0.1/3 part by weight, the degree of emulsification by the natural emulsifier (5) is not sufficiently improved, so that the curing period of the petroleum resin binder (20) may be delayed, and if it is greater than 0.5/3 part by weight, the degree of emulsification may be excessively improved, so that a phase separation phenomenon between water (11), petroleum resin (12), and liquefied waste plastic (3) may occur.

With this mixing ratio, a petroleum resin binder (20) with improved environmental friendliness and emulsification can be provided.

According to various embodiments, the petroleum resin binder (20) is composed of 0.1 to 3.0 parts by weight of an anti-stripping agent and 0.1 to 3.0 parts by weight of an aqueous acrylic emulsion adhesive as an additive (7) with respect to the mixing ratio for water (11), petroleum resin (12), liquefied waste plastic (3), a liquefying agent (2), a natural emulsifier (5), sodium hydroxide, and octylphenol ethoxylate.

If the amount of anti-stripping agent is less than 0.1 part by weight, the petroleum resin (12) and plastic resin are easily stripped from the surface of the recycled aggregate (10), and if it is greater than 3.0 parts by weight, the duration of the anti-stripping effect may be reduced.

If the amount of the water-based acrylic emulsion adhesive is less than 0.1 part by weight, the strength of the circulating aggregate (10) may be reduced, and if the amount of the water-based acrylic emulsion adhesive is greater than 3.0 parts by weight, the strength may be strengthened too much, causing cracks to occur in the circulating aggregate (10).

According to this mixing ratio, a petroleum resin binder (20) with improved adhesion and tackiness of the petroleum resin (12) and plastic resin to the recycled aggregate (10) can be provided.

According to various embodiments, the petroleum resin binder (20) may be composed of 1 to 30 parts by weight of an auxiliary resin (8) in addition to the above mixing ratio for water (11), petroleum resin (12), liquefied waste plastic (3), liquefier (2), natural emulsifier (5), sodium hydroxide, and octylphenol ethoxylate.

If the auxiliary resin (8) is less than 1 part by weight, the strength of the recycled aggregate (10) may be reduced, and if the auxiliary resin (8) is greater than 30 parts by weight, the strength may be strengthened too much, causing cracks to occur in the recycled aggregate (10).

Figure 2 illustrates the manufacturing process of a petroleum resin binder and recycled asphalt.

As shown in Fig. 2, liquefied waste plastic (3) is produced through liquefaction treatment of solid waste plastic (1) (S21). The liquefaction treatment is performed at room temperature, and a liquefier (2) is used.

In this way, since high-temperature melting treatment of solid waste plastic (12) is not required to obtain liquefied waste plastic (3), not only environmental damage due to harmful gases generated during high-temperature melting treatment but also human damage can be prevented in advance.

Liquefied waste plastic (3) is mixed with petroleum resin (12) (S22). If the liquefied waste plastic (3) is first added to water (11), a coagulation phenomenon or a tangle phenomenon occurs, and even if the petroleum resin (12) and emulsifier (4) are added thereafter, it may be difficult to improve the emulsification degree of the liquefied waste plastic (3) in water (11).

Therefore, first mixing the liquefied waste plastic (3) with the petroleum resin (12) may be advantageous in improving the emulsification of the liquefied waste plastic (3) in water (11). In addition, in order to facilitate mixing between the petroleum resin (12) and the liquefied waste plastic (3), they may be mixed while each is heated to 150 degrees Celsius.

Mixed petroleum resin (12) and liquefied waste plastic (3) are mixed with water (11) together with an emulsifier (4) to produce a petroleum resin binder (20) (S23). When the water (11) is heated to 50 degrees Celsius and the mixed petroleum resin (12) and liquefied waste plastic (3) are heated to 150 degrees Celsius and mixed, the emulsification degree of the petroleum resin (12) and liquefied waste plastic (3) in water (11) can be improved.

When sodium hydroxide is added as needed, the plastic resin of the petroleum resin (12) and the liquefied waste plastic (3) can be more easily emulsified in water (11) by the emulsifier (4). Of course, the environmental friendliness can be further improved by the use of the natural emulsifier (5), and the emulsification degree of the natural emulsifier (5) can be further improved by the use of octylphenol ethoxylate.

Sodium hydroxide or octylphenol ethoxylate is first mixed with an emulsifier (4) and then added to water (11), or is added to water (11) together with an emulsifier (4). Meanwhile, when an auxiliary resin (8) is used, the auxiliary resin (8) is added to a petroleum resin (12), and when a water-based acrylic emulsion adhesive is used, the water-based acrylic emulsion adhesive is added to a petroleum resin binder (20) produced by a mixing process.

The petroleum resin binder (20) manufactured by mixing water (11), petroleum resin (12), and liquefied waste plastic (3) undergoes a cooling process (S24). The cooling process is a post-processing process that can help prevent coagulation or entanglement between the petroleum resin (12) existing as colloidal particles in water (11) and the plastic resin of the liquefied waste plastic (3). The petroleum resin binder (20) can be cooled to room temperature, but is not limited thereto, and may be cooled to a temperature lower than that.

In this way, the mixing process in a heated environment facilitates mixing between water (11), petroleum resin (12) and liquefied waste plastic (3), and the cooling process maintains the dispersion state of the petroleum resin (12) and the plastic resin, thereby improving the production convenience and quality of the petroleum resin binder (20).

A regenerated asphalt concrete (15) for road paving is manufactured by mixing a petroleum resin binder (20) and recycled aggregate (10) (S25). Since the mixing process is performed at room temperature, a separate heating mixing device is not required, which not only improves environmental friendliness but also improves work convenience.

In this way, according to the manufacturing process of the petroleum resin binder (20) and the regenerated asphalt concrete (15) according to the present embodiment, a more environmentally friendly binder can be manufactured, and regenerated asphalt concrete (15) can be manufactured more easily.

Figure 3 illustrates an experimental example for confirming the degree of reduction in hazardous substances in relation to the petroleum resin binder of Figure 1.

In the case of asphalt binders, harmful gases are mainly generated during the mixing process by a mixer (14), but in the case of petroleum resin binders (20) that utilize solid waste plastics (1), harmful gases are mainly generated during the manufacturing process of liquefied waste plastics (3).

Hereinafter, with reference to FIG. 3, the hazardous gases generated during the process of manufacturing a first petroleum resin binder (31) using liquefied waste plastic (3) through room temperature liquefaction treatment and the hazardous gases generated during the process of manufacturing a second petroleum resin binder (32) using liquefied waste plastic (23) through high temperature melting treatment are compared and explained. The high temperature melting treatment was performed at 250 degrees Celsius or higher, but is not limited thereto and may be performed at 200 degrees Celsius or higher depending on the performance of the melting device. The measured hazardous gases are representative evaporated gases, such as ammonia, trimethyl amine, isobutyr aldehyde, valer aldehyde, toluene, xylene, and stillen.

As a result of the analysis, in the manufacturing process of the first petroleum resin binder (31), hydrogen chloride, which is fatal to the human body, was not detected, whereas in the manufacturing process of the second petroleum resin binder (31), 0.3 ppm of hydrogen chloride was detected. In addition, isobutyraldehyde, valeraldehyde, toluene, xylene, and styrene were also detected in large amounts in the manufacturing process of the second petroleum resin binder (31) compared to the manufacturing process of the first petroleum resin binder (31). Of course, even in the manufacturing process of the first petroleum resin binder (31), some harmful gases are generated due to the room temperature reaction between the solid waste plastic (1) and the liquefier (2), but it can be confirmed that the level is minimal compared to the harmful gases generated during high-temperature melting treatment.

In this way, manufacturing liquefied waste plastic (3) through room temperature liquefaction treatment of solid waste plastic (1) can be more environmentally friendly than manufacturing liquefied waste plastic (23) through high temperature melting treatment.

Figure 4 illustrates an experimental example for confirming the degree of improvement in emulsification by a hydrophilic liquefying agent in relation to the petroleum resin binder of Figure 1.

As shown in Fig. 4, in order to confirm the degree of improvement in emulsification, a first petroleum resin binder (31) and a third petroleum resin binder (33) were prepared. The first petroleum resin binder (31) and the third petroleum resin binder (33) were manufactured by mixing water (11), petroleum resin (12), and liquefied plastic (3) through room temperature liquefaction treatment, but they differ in that the first petroleum resin binder (31) uses acetone, a hydrophilic solvent, as a liquefier, and the third petroleum resin binder (33) uses benzene, a lipophilic liquefier, as a liquefier.

The emulsification degree was measured by placing 5 ml of each petroleum resin binder in a centrifuge tube, centrifuging at 3000 g for 5 minutes at room temperature, and calculating the emulsification degree using the following <formula>.

Emulsification (%) = Height of emulsified layer / Total height of petroleum resin binder… … … … … <Formula>

As a result of the analysis, the emulsification degree of the first petroleum resin binder (31) using a hydrophilic liquefier was confirmed to be 94%, and the emulsification degree of the third petroleum resin binder (33) using a lipophilic liquefier was confirmed to be 86%. In other words, the emulsification degree of the third petroleum resin binder (33) was confirmed to be about 8% lower than that of the first petroleum resin binder (31). Similarly, when sodium hydroxide was added to both sides to improve the emulsification degree, a difference in emulsification degree of about 8% was observed.

As in this experimental example, when a hydrophilic solvent is used in the liquefaction treatment of solid waste plastic (1), an improved emulsification degree can be achieved compared to when a lipophilic solvent belt is used.

Figure 5 illustrates an experimental example for confirming the degree of improvement in emulsification by a natural emulsifier and an emulsifying assistant in relation to the petroleum resin binder of Figure 1.

As shown in Fig. 5, in order to confirm the degree of improvement in the degree of emulsification, a first petroleum resin binder (31) and a fourth petroleum resin binder (34) were prepared. The first petroleum resin binder (31) and the fourth petroleum resin binder (34) were manufactured by mixing water (11), petroleum resin (12), and liquefied plastic (3) using a hydrophilic liquefier, but they differ in that the first petroleum resin binder (31) uses a natural emulsifier (5), and the fourth petroleum resin binder (34) uses an emulsifier of an organic compound component. The degree of emulsification was measured in the same manner as described with reference to Fig. 4, and the degree of emulsification was calculated using the <Formula> of Fig. 4.

As a result of the analysis, the emulsification degree of the first petroleum resin binder (31) using a natural emulsifier (5) was confirmed to be 94%, and the emulsification degree of the fourth petroleum resin binder (34) using an organic compound emulsifier was confirmed to be 98%. In other words, the emulsification degree of the first petroleum resin binder (31) was confirmed to be about 4% lower than that of the fourth petroleum resin binder (34). Similarly, when sodium hydroxide was added to both sides to improve the emulsification degree, a difference in emulsification degree of about 4% was observed.

However, when an emulsifying assistant (6) is added to the first petroleum resin binder (31) to improve the emulsifying power of the natural emulsifier (5), the emulsifying degree of the first petroleum resin binder (31) can be improved to a level comparable to that of the fourth petroleum resin binder (34). For example, when the natural emulsifier (5) is G5000, the emulsifying assistant (6) can be octylphenol ethoxylate.

As in this experimental example, the use of a natural emulsifier (5) is effective in improving environmental friendliness, but has the disadvantage of lowering the degree of emulsification. However, if an emulsifying auxiliary agent (6) is appropriately used, the lowered degree of emulsification is compensated for, and a petroleum resin binder (20) that achieves both improved environmental friendliness and increased degree of emulsification can be provided.

FIG. 6 illustrates a composition of a petroleum resin binder and recycled asphalt according to another embodiment of the present invention.

In this embodiment, when manufacturing a petroleum resin binder (20), a plurality of liquefied waste plastics (42, 52) liquefied from a plurality of solid waste plastics (41, 42) may be used. The plastic resins of the plurality of solid waste plastics (41, 42) or the plurality of liquefied waste plastics (42, 52) may be of different types. For example, the first solid waste plastic (41) and the first liquefied waste plastic (42) may be PVC, and the second solid waste plastic (51) and the second liquefied waste plastic (52) may be PE.

When using multiple liquefied waste plastics (42, 52), multiple emulsifiers (43, 53) are used to emulsify the multiple liquefied waste plastics (42, 52) in water (11). For example, a first emulsifier (43) that is advantageous in improving the emulsification degree of the first liquefied waste plastic (42) and a second emulsifier (53) that is advantageous in improving the emulsification degree of the second liquefied waste plastic (52) can be used.

As described with reference to FIG. 1, a plurality of liquefied waste plastics (42, 52) are first mixed with a petroleum resin (12), and the mixed petroleum resin (12) and a plurality of liquefied waste plastics (42, 52) are mixed with a plurality of emulsifiers (43, 53) in water (11) to manufacture a petroleum resin binder (20). In this process, an emulsifying auxiliary agent (6), such as sodium hydroxide, may be added to improve emulsification.

In this way, when manufacturing a petroleum resin binder (20), if a variety of liquefied waste plastics (42, 52) are utilized, a large amount of waste plastics can be recycled compared to when a single type of liquefied waste plastic (3) is used, so it can be more helpful in improving environmental friendliness through recycling.

In addition, even if a plurality of liquefied waste plastics (42, 52) are added, if a single type of emulsifier (4) is used, there is a possibility that the emulsification degree of the plurality of liquefied waste plastics (42, 52) in water (11) may decrease. However, since a plurality of emulsifiers (43, 53) corresponding to each of the plurality of liquefied waste plastics (42, 52) are used, the emulsification degree of the plurality of liquefied waste plastics (42, 52) in water (11) can be prevented.

According to various embodiments, a recycled aggregate (10) coated with a first molten waste plastic (62) may be used in the production of a petroleum resin binder (20). The first molten waste plastic (62) may be prepared by high-temperature melting treatment of a third solid waste plastic (61). The third solid waste plastic (61) may be of the same type as or different from the plurality of solid waste plastics (41, 42) described above.

When the high-temperature melting treatment is performed at 200 degrees Celsius or higher, a large amount of toxic gases may be generated, so the high-temperature melting treatment may be performed on the third solid waste plastic (61) having a heat distortion temperature of less than 200 degrees Celsius. The heat distortion temperature refers to the temperature at which the solid state begins to transform into a liquid state, and as the third solid waste plastic (61), PVF (poly vinyl fluoride), PVDC (poly vinylidene chloride), etc. having a heat distortion temperature of 100 to 200 degrees Celsius may be used, or PVC, ABS, polystyrene, polyethylene, etc. having a heat distortion temperature of less than 100 degrees Celsius may be used.

After the first molten waste plastic (62) is coated on the surface of the recycled aggregate (10), a cooling process is performed so that the coating state can be maintained. Through the cooling process, the first molten waste plastic (62) becomes a solid state, and if it is not heated to the thermal deformation temperature, it can maintain the solid state while being coated on the surface of the recycled aggregate (10).

The recycled aggregate (10) coated with the first molten waste plastic (62) can be mixed with a petroleum resin binder (20) to produce recycled asphalt (15). Here, the petroleum resin binder (10) may be made using a single liquefied waste plastic (3) or a plurality of different liquefied waste plastics (42, 52), as described in detail above.

The mixing process is carried out in a heated environment for easy mixing between the petroleum resin binder (20) and the coated recycled aggregate (10), and it is preferable to carry out the mixing process below the heat deformation temperature so that the first molten waste plastic (62) coated on the recycled aggregate (10) is not thermally deformed.

In this way, when the recycled aggregate (10) coated with the first molten waste plastic (62) is used, a large amount of waste plastic can be utilized compared to the case where waste plastic is recycled by adding a single liquefied waste plastic (3) or multiple liquefied waste plastics (42, 52) to the petroleum resin (12), so the environmental friendliness of recycling waste plastic can be further improved.

According to various embodiments, a plurality of molten waste plastics (62, 72) of different types may be coated on the recycled aggregate (10). The plurality of molten waste plastics (62, 72) may be prepared by high-temperature melting treatment of a plurality of solid waste plastics (61, 71) having different heat deformation temperatures. For example, a first molten waste plastic (62) from a third solid waste plastic (61) having a heat deformation temperature of 100 to 200 degrees Celsius is first coated on the recycled aggregate (10), and a cooling process is performed to maintain the coating state. After the cooling process for the circular aggregate (10) coated with the first molten waste plastic (62) is completed, the second molten waste plastic (62) from the fourth solid waste plastic (71) having a heat distortion temperature of less than 100 degrees Celsius is coated for the second time on the circular aggregate (10) coated with the first molten waste plastic (62). The cooling process may be performed so that the state in which the second molten waste plastic (62) is coated on the first molten waste plastic (62) can be maintained.

If the second molten waste plastic (62) having a low heat deformation temperature is first coated on the recycled aggregate (10) and the first molten waste plastic (62) having a high heat deformation temperature is second coated, the second molten waste plastic (62) undergoes heat deformation and cannot maintain the coating state. Therefore, it is preferable to coat the first molten waste plastic (62) having a high heat deformation temperature first and then coat the second molten waste plastic (62) having a low heat deformation temperature later.

In this way, when the recycled aggregate (10) is used in which the first molten waste plastic (62) and the second molten waste plastic (62) are sequentially coated, a large amount of waste plastic can be utilized compared to when the recycled aggregate (100) is used in which a single first molten waste plastic (62) is coated, and thus the environmental friendliness through recycling of the waste plastic can be further improved.

Although the present invention has been described in detail through preferred embodiments, the present invention is not limited thereto and may be implemented in various ways within the scope of the claims.

1: Solid waste plastic
2: Liquefying agent
3: Liquefied waste plastic
4: Emulsifier
5: Natural emulsifier
6: Emulsifying Auxiliary
7: Additives
8: Auxiliary resin
10: Circular aggregate
11: Water
12; Petroleum resin
13: Mixing device
14: Mixer
15; Play Ascon

Claims (5)

In a petroleum resin binder applied to a circular aggregate for a subbase layer,
30 to 80 parts by weight of water,
20 to 70 parts by weight of C9 petroleum resin, a light yellow thermoplastic obtained through polymerization of aromatic olefins generated in the naphtha pyrolysis process.
10-15 parts by weight of liquefying agent,
20 to 50 weight parts of liquefied waste plastic by liquefying solid waste plastic with the above liquefying agent,
0.5 to 10 parts by weight of anionic emulsifier for emulsifying the water, the petroleum resin and the liquefied plastic;
0.1 to 1.0 weight part of sodium hydroxide to increase the emulsifying power between the water, the petroleum resin and the liquid waste plastic by the anionic emulsifier;
0.1 to 0.3 parts by weight of an anti-stripping agent that prevents the plastic resin of the petroleum resin and the liquid waste plastic from being stripped from the above-mentioned recycled aggregate, and
Contains 0.1 to 3.0 parts by weight of a water-based acrylic emulsion adhesive that improves the adhesion of the petroleum resin and the plastic resin to the above-mentioned recycled aggregate,
The above petroleum resin and the above liquefied plastic are first mixed together, and then emulsified in the water by the anionic emulsifier, and exist in the water as colloidal particles having an average particle size of 1 to 5 μm.
The above liquefying agent comprises a hydrophilic solvent having a higher emulsification degree of the petroleum resin binder than the lipophilic solvent,
A petroleum resin binder, wherein the anionic emulsifier comprises a natural emulsifier, and further comprises 0.1/3 to 0.5/3 weight part of octylphenol ethoxylate so that the degree of emulsification of the petroleum resin binder by the natural emulsifier corresponds to the degree of emulsification of the petroleum resin binder by the organic compound emulsifier.
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