KR102326863B1 - Manufacturing apparatus for molded articles, method thereof and molded articles - Google Patents

Abstract

The present invention relates to a method for manufacturing a molded article and a molded article, comprising: preparing a raw material including slag, plastic, and a modifier; modifying the surface of the slag with the modifier to have the same properties as the plastic; and a process of manufacturing a molded body by extruding a mixture containing the modified slag and the plastic; including, by improving the affinity between the slag and the plastic, it is possible to manufacture a high strength and high quality molded body.

Description

Molded article manufacturing equipment, molded article manufacturing method and molded article

The present invention relates to a molded body manufacturing facility, a molded body manufacturing method, and a molded body, and more particularly, a molded body manufacturing facility capable of manufacturing a molded body with excellent mechanical properties by utilizing by-products and waste plastics generated in an ironworks, a molded body manufacturing method and a molded body is about

The steelmaking process generates a large amount of various types of by-products while manufacturing steel products. One example of these by-products is slag, and the slag is largely classified into blast furnace slag, steelmaking slag, and ferronickel slag. Some of these slags are used as raw materials for cement, fertilizers, paints, and aggregates for civil engineering, but most of them are disposed of in landfills.

On the other hand, plastic has excellent convenience, chemical resistance, etc., and is used as an industrial material not only for various household items, but also for parts manufacturers and molding companies. A large amount of plastic is manufactured as a single-use product, and after use, it can be collected as waste plastic and recycled. However, waste plastic is supplied very cheaply, and despite excellent physical properties such as strength and chemical resistance, a large amount is incinerated or disposed of in landfills. In this case, there is a problem in that air, soil and water quality are polluted.

US 10-1998-044182 A

The present invention provides a molded article manufacturing facility, a molded article manufacturing method, and a molded article capable of manufacturing a molded article having excellent mechanical properties.

The present invention provides a molded article manufacturing facility, a molded article manufacturing method, and a molded article capable of improving the durability and lifespan of the equipment.

The present invention provides a molded article manufacturing facility, a molded article manufacturing method, and a molded article capable of reducing manufacturing cost and reducing environmental pollution.

A molded article manufacturing facility according to an embodiment of the present invention includes: a reforming unit for reforming the surface of slag to have the same properties as plastic; and a molding unit for manufacturing a molded body by extruding the slag and plastic.

The reforming unit may include: a container forming a space capable of accommodating the slag therein; a modifier feeder capable of supplying a modifier for reforming the surface of the slag to the vessel; and a stirrer installed in the vessel to stir the slag.

The reforming unit may include: a container rotatable and forming a space capable of accommodating the slag therein; and a modifier supplier capable of supplying a modifier for reforming the surface of the slag to the container.

The reforming unit may include a first heating means formed in the container to heat the slag.

The molding part forms a space therein, a first inlet for injecting the plastic, a second inlet for injecting the reformed slag, and an outlet for discharging a mixture containing the reformed slag and the plastic The extruder body is formed; a screw formed in the extruder body to move the reformed slag and the plastic from the first inlet and the second inlet to the outlet; a die formed to have an inner diameter smaller than the inner diameter of the extruder body and connected to the outlet; a second heating means formed in the extruder body; and a control unit capable of controlling the second heating means, wherein the second inlet may be formed between the first inlet and the outlet.

A method for manufacturing a molded article according to an embodiment of the present invention includes a process of preparing a raw material including slag, a plastic, and a modifier; modifying the surface of the slag with the modifier to have the same properties as the plastic; and extruding a mixture containing the modified slag and the plastic to manufacture a molded body; may include.

The process of preparing the raw material may include a component adjustment process of adjusting the CaO content of the slag.

The process of preparing the raw material, the process of collecting waste plastic; and crushing the waste plastic.

The process of preparing the raw material may include a process of preparing the modifier in a solution state.

The process of modifying the surface of the slag may include: spraying the modifier to the slag; mixing the modifier and the slag; and reacting the slag with the modifier at ambient temperature.

The process of preparing the modifier may include preparing the modifier in a liquid state by dissolving 0.1 to 0.5% by weight of the modifier in a solvent based on the total of the slag and the modifier.

The process of modifying the surface of the slag may include a process of drying the modified slag by reacting with a modifier, and the drying process may include a process of heating the reformed slag to a temperature higher than the boiling point of the solvent. can

The process of modifying the surface of the slag may include a process of imparting hydrophobicity to the slag.

The process of manufacturing the molded body may include: dissolving the plastic to prepare a plastic melt; When the plastic melt is prepared, the process of injecting the modified slag into the plastic melt; dispersing the reformed slag in the plastic melt; and extruding the plastic melt in which the modified slag is dispersed.

The process of preparing the plastic melt may include adding at least one of a compatibilizer, a colorant, and a UV stabilizer.

The process of manufacturing the molded body may include, before the process of injecting the modified slag into the plastic melt, heating the modified slag to a temperature equal to or higher than the melting point of the plastic.

The extruding process may include maintaining the plastic melt and the modified slag at a temperature equal to or higher than the melting point of the plastic.

The process of preparing the raw material may include the process of preparing ferronickel slag generated in the process of manufacturing molten ferronickel steel.

A molded article according to an embodiment of the present invention is plastic; slag disposed to be dispersed in the form of particles in the plastic; and a modifier chemically bonded to the slag and positioned between the slag and the plastic.

The slag may contain 10 wt% or less of CaO based on the total weight of the slag.

The slag may include at least one of blast furnace slag, steelmaking slag, and ferronickel slag, and the plastic may include waste plastic.

The particle size of the slag may be 0.01 to 0.15 mm.

The slag may include angled polyhedral particles.

The modifier may include a siloxane oligomer.

The plastic may include one of polyethylene terephthalate (PET), polyethylene (PolyEthylene, PE), polypropylene (PolyPropylene, PP), polystyrene (PS) and polycarbonate (PolyCarbonate, PC).

The plastic includes at least two of polyethylene terephthalate (PET), polyethylene (PolyEthylene, PE), polypropylene (PolyPropylene, PP), polystyrene (PS) and polycarbonate (PolyCarbonate, PC), and two It may further include a compatibilizer positioned between the above plastics.

According to the embodiment of the present invention, it is possible to manufacture a molded article having excellent mechanical properties by using slag and waste plastic generated in the ironmaking process. Such a molded body may be used as a building material, a civil engineering material, etc., and has excellent strength and corrosion resistance, and thus the durability and lifespan of a structure constructed using the molded body may be improved. In particular, since the surface of the slag is modified and used, adhesion between the slag and the waste plastic can be improved, and the slag can be evenly dispersed in the melt of the waste plastic. Therefore, a high-strength and high-quality molded object can be manufactured.

In addition, by manufacturing the molded body, which is a high value-added product, using waste, the manufacturing cost of the molded body can be reduced, and environmental pollution caused by the waste can be suppressed or prevented.

In the case of extruding slag and waste plastic to produce a molded body, direct contact of the high hardness slag with the screw and the inner surface of the extruder body can be suppressed by introducing the slag and the waste plastic into the extruder body with a time difference. Therefore, it is possible to extend the life of the extruder body by suppressing the wear or damage of the screw and the extruder body due to contact with the slag.

1 is a view schematically showing a molded body manufacturing facility according to an embodiment of the present invention.
Figure 2 is a flowchart sequentially showing a process of manufacturing a molded body by the molded body manufacturing method according to an embodiment of the present invention.
3 is a flowchart sequentially showing a process of manufacturing a molded body in the molded body manufacturing method according to an embodiment of the present invention.
Figure 4 is a cross-sectional view conceptually showing the internal structure of the molded body manufactured by the method for manufacturing the molded body according to an embodiment of the present invention.
5 is a photograph showing examples of products manufactured by the method for manufacturing a molded body according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and the scope of the invention to those of ordinary skill in the art completely It is provided to inform you. In the drawings, like reference numerals refer to like elements.

The present invention relates to a technology for manufacturing a product having excellent mechanical properties by using slag generated in a steelmaking process, and waste plastics collected from household waste and industrial waste. Hereinafter, an example of manufacturing a molded body used as a building material, a civil engineering material, etc. from slag and waste plastic will be described. Here, the slag may contain a CaO component in an amount of 10% by weight or less based on the total weight of the slag. And the waste plastic may include a thermoplastic that melts when heat is applied, and changes back to a solid state when cooled. Since slag has different physical properties from waste plastics, wettability during extrusion is poor, and slag is not uniformly dispersed in the melt of waste plastics. Therefore, the slag may be modified to improve wettability with plastics using a modifier having an amphiphilic property, and a molded article may be manufactured using the modified slag. Accordingly, by improving the affinity between the slag and the waste plastic, the slag can be uniformly dispersed in the melt of the waste plastic, and the adhesion between the slag and the waste plastic can be improved to manufacture a high-strength molded article.

1 is a view schematically showing a molded body manufacturing facility according to an embodiment of the present invention.

Referring to FIG. 1, the molded body manufacturing facility according to an embodiment of the present invention includes a reforming unit 100 for reforming slag and a molded body by melt-extruding slag and plastic, for example, a slag-molding unit for manufacturing a plastic composite ( 200) may be included. In addition, the molding manufacturing facility may include a cutting unit 300 for cutting the formed body, and a controller (not shown) for controlling the operations of the reforming unit 100 , the molding unit 200 , and the cutting unit 300 .

The reforming unit 100 may modify the surface of the slag so that the plastic can be easily attached to the surface of the slag. The reformer 100 may include a container 110 that forms a space capable of accommodating slag therein, and a modifier supplier 120 for supplying a reformer to the interior of the container 110 . In addition, the reforming unit 100 may include a stirrer 140 installed in the vessel 110 to mix the slag and the modifier and a first heating means 130 capable of heating the space inside the vessel 110 . .

The container 110 may form a space for accommodating the slag and the modifier accommodated therein. The container 110 may have an open top so that the modifier and the slag can be injected.

The modifier feeder 120 may include a reservoir 122 for accommodating the modifier, and a nozzle 124 for supplying the modifier discharged from the reservoir 122 into the container 110 . In this case, the nozzle 124 may be installed on one side of the upper portion of the container 110 to supply or spray the modifier into the container 110 . Alternatively, the nozzle 124 may be installed inside the container 110 or may be installed outside and inside the container 110 so as to spray the modifier to the slag accommodated in the container 110 .

The stirrer 140 may be partially inserted into the container 110 and installed to be rotatable. The stirrer 140 may include a rotating shaft 142 and at least one blade 144 formed to protrude from the outer surface of the rotating shaft 142 . At this time, the rotating shaft 142 is disposed to penetrate the container 110 and extend in the vertical direction, and the rotating shaft 142 may be rotated by the rotational force provided by the power unit 146 . However, if the slag accommodated in the container 110 can be stirred, the agitator 140 may be formed to have various other structures. When the agitator 140 rotates the rotation shaft 142 in a state in which the blade 144 is inserted into the container 110 , the blade 144 may agitate the slag accommodated in the container 110 . Accordingly, when the modifier is supplied or sprayed into the container 110 , the modifier may be evenly attached to the slag surface while the slag and the modifier are stirred.

Here, it is described that the modifier is attached to the slag surface using the stirrer 140 , but the vessel 110 itself may be rotatably formed without the stirrer 140 to mix or stir the slag and the modifier. In this case, the container 110 may include a drum mixer that can be tilted to one side and rotated.

On the other hand, the modifier may be provided in a liquid state so that it can adhere well to the slag surface. For example, the modifier may be prepared in a liquid state, that is, a solution in which the modifier in a solid state is dissolved in a solvent such as ethanol. Accordingly, after the modifier is attached to the surface of the slag by spraying a solution containing the modifier to the slag, the slag to which the modifier is attached may be heated and dried. From now on, the slag before the modifier is attached is called slag, and the slag after the modifier is attached is called the modified slag.

When the reformed slag is wet, the solvent contained in the modifier evaporates during extrusion to generate steam, and defects such as bubbles in the molded body may be generated by the steam. Since these defects have a problem of lowering the strength of the compact, it is preferable to dry the modified slag so that defects such as air bubbles do not occur in the compact.

Therefore, by installing the first heating means 130 in the container 110, it is possible to dry the reformed slag. In this case, the first heating means 130 may heat the vessel 110 to a temperature sufficient to evaporate the solvent contained in the reformed slag. When the slag is introduced into the container 110 through this configuration, the modifier may be supplied or sprayed into the container 110 through the modifier feeder 120 while rotating the stirrer 140 or the vessel 110 . Accordingly, the slag accommodated in the container 110 may be in contact with the modifier supplied or sprayed into the container 110 while being stirred. And the slag reacts with the modifier attached to the surface, and as shown in FIG. 1, the reactant is adsorbed on the surface of the slag (s) to form a coating film (c). Thereafter, the reformed slag inside the container 110 may be dried by stopping the supply or spraying of the modifier and heating the container 110 using the first heating means 130 . The first heating means 130 may heat the reformed slag to a temperature greater than or equal to the melting point of the plastic. The reformed slag may be used to manufacture a compact immediately after drying, or may be stored in a separate storage location and used to manufacture the compact.

The reformed slag can be fed directly into the plastic melt during the extrusion process. Therefore, in order to prevent the temperature drop of the plastic melt during the extrusion process, the modified slag may be heated in the container 110 by the first heating means 130 to a temperature at least higher than the melting point of the plastic and then used in the extrusion process. Although it has been described here that the reforming unit 100 heats the reformed slag, the reformed slag may be heated in a separate heating device (not shown).

The molding unit 200 may manufacture the molded body E by extruding the modified slag and plastic. The molding unit 200 includes an extruder body 212 that forms a space for accommodating the modified slag and plastic, and a screw 230 and extruder body 212 that are rotatably formed inside the extruder body 212. It may include a die 220 to which it is connected. In addition, the molding unit 200 may include a second heating means 240 formed in the extruder body 212 to melt the plastic accommodated in the extruder body 212 . In addition, the molding unit 200 may include a mixing container (not shown) for uniformly mixing the plastic with additives such as a UV stabilizer, a colorant, and a compatibilizer before injecting the plastic into the extruder body 212 .

The extruder body 212 may form a space capable of receiving a mixture of modified slag and plastic or a mixture comprising modified slag, plastic and additives. The extruder body 212 may be formed in a hollow shape extending in one direction, for example in a horizontal direction, and may be formed, for example, in a substantially cylindrical shape with both sides open. One side of the extruder body 212 is formed to be opened to install the screw 230 , and the other side of the extruder body 212 may be used as an outlet 216 for discharging the mixture to the die 220 . In addition, a first inlet 214 for injecting plastic or plastic and additives and a second inlet 215 for injecting the modified slag may be formed on the upper portion of the extruder body 212 . The first inlet 214 and the second inlet 215 may be formed in a funnel shape or a hopper shape so that plastics, additives and modified slag can be easily injected into the extruder body 212 . The first inlet 214 and the second inlet 215 may be formed to be spaced apart from each other in the longitudinal direction of the extruder body 212 . The second inlet 215 may be formed between the first inlet 214 and the outlet 216 . The first inlet 214 is formed in the rear side in the direction in which the mixture moves or the mixture is extruded in the extruder body 212, and the second inlet 215 is the front in the direction in which the mixture moves or the mixture is extruded. can be formed on the side. The plastic and the modified slag may be injected into the extruder body 212 with a time difference. For example, the plastic may be injected through the first inlet 214 , and when the plastic is dissolved, the modified slag may be injected into the plastic melt through the second inlet 215 . However, in the initial stage of manufacturing the molded body, the plastic and the modified slag may be sequentially injected with a time difference, but since the extrusion process is performed continuously, the plastic and the modified slag are mixed with the extruder body 212 during the production of the molded body by the extrusion process. ) can be continuously injected. In addition, at the end of the extrusion process in which the production of the molded body is completed, the injection of the plastic may be stopped and the injection of the modified slag may be stopped after a predetermined time has elapsed. As such, by forming the first inlet 214 for injecting the plastic into the extruder body 212 and the second inlet 215 for injecting the reformed slag spaced apart, the reformed slag can be injected into the plastic melt, It is possible to suppress or prevent abrasion of the extruder body 212 or the screw 230 by the modified slag.

The die 220 may be connected to the outlet 216 of the extruder body 212, has an inner diameter smaller than the inner diameter of the extruder body 212, and may be formed in a hollow shape with both sides open. The inner space of the die 220 may be formed in various shapes so that the die 220 may form a molded body E having a desired shape by forming a mixture of the modified slag and plastic. For example, when the molded body E is formed to have a rectangular plate shape, the inner space of the die 220 may be formed to have a rectangular slit cross-sectional shape. Alternatively, when the molded body E is formed to have a cylindrical bar shape, the inner space of the die 220 may be formed to have a circular cross-sectional shape.

The screw 230 may be disposed in the extruder body 212 along the direction in which the extruder body 212 extends. At this time, one side of the screw 230 may be rotatably connected to the open side of the extruder body 212 through a connection means 231 such as a bearing. And the other side of the screw 230 may be arranged to extend to a connection portion between the extruder body 212 and the die 220 . The screw 230 is rotated by the driving of the actuator 232 provided in the extruder body 212 to move the mixture injected into the extruder body 212 toward the outlet 216 and through the die 220 to the extruder body ( 212) can be extruded to the outside.

The second heating means 240 may be formed in the extruder body 212 to heat the extruder body 212 . The second heating means 240 can heat the extruder body 212 to a temperature above the melting point of the plastic, and the length direction of the extruder body 212 so that the plastic can maintain a temperature above the melting point of the extruder body 212 inside the extruder body 212. can be formed according to

The control unit may control the second heating means 240 to adjust the temperature of the extruder body 212 in the direction in which the extruder body 212 is extended or the mixture is extruded. At this time, the controller may control the second heating means 240 to adjust the temperature of the second inlet 215 side into which the modified slag is injected higher than the temperature of the first inlet 214 side into which the plastic is injected. . Alternatively, the controller may control the second heating means 240 to increase the temperature from the extruder body 212 toward the outlet 216 through which the mixture is extruded from the first inlet 214 to which the plastic is injected. This is to uniformly disperse the modified slag in the melt of plastic by lowering the viscosity of the plastic melt because the modified slag is injected into the extruder body 212 after the plastic is melted. When the mixture is heated in this way, the plastic component in the mixture is dissolved to form a plastic melt, and the molten plastic, such as the modified slag, can be uniformly dispersed in the plastic melt.

Through this configuration, the plastic and the modified slag are injected into the extruder body 212 and then move along the inside of the extruder body 212 by the rotation of the screw 230, and through the die 220, the extruder body 212 outside. It can be extruded into a molded body (E).

The molding unit 200 may continuously form the molded body (E) by extruding the mixture. The molded body E thus formed may be cut to have a predetermined length or a desired length by the cutting part 300 . The cut portion 300 may be disposed to be spaced apart from the extruder body 212 in the front of the extruder body 212, or in front of the die 220 in the direction in which the molded body is discharged.

Here, it has been described that the molding unit 200 extrudes a mixture of slag and plastic through the die 220 to manufacture a molded body. However, the molded body may be manufactured by injecting a mixture of slag and plastic extruded through the die 220, for example, a slag-plastic composite into a separate mold (not shown) and then cooling.

Hereinafter, a method for manufacturing a molded body according to an embodiment of the present invention will be described.

2 is a flowchart sequentially showing a process of manufacturing a molded body by the method for manufacturing a molded body according to an embodiment of the present invention, and FIG. am. 4 is a cross-sectional view conceptually showing the internal structure of a molded body manufactured by the method for manufacturing a molded body according to an embodiment of the present invention, and FIG. 5 is a photograph showing examples of products manufactured by the method for manufacturing a molded body according to an embodiment of the present invention. .

Referring to FIG. 2 , the method for manufacturing a molded body according to an embodiment of the present invention includes a process ( S110 , S112 , S120 ) of preparing a raw material including slag, plastic, and a modifier, and using the modifier to have the same properties as plastic. It may include a process of modifying the surface of the slag (S130) and a process of manufacturing a molded body by extruding a mixture containing the modified slag and plastic (S140).

A slag for manufacturing a molded body may be prepared (S110). In this case, the slag may include various slags generated in the ironmaking process, and may contain CaO in an amount of 10 wt% or less. Alternatively, the slag may contain CaO in an amount of 0 wt% to 5 wt%, or 0.01 to 2.0 wt%. Such slag may include ferronickel slag generated in the process of manufacturing ferronickel molten steel. Alternatively, the slag may include slag whose composition is adjusted to contain 10 wt% or less of CaO by mixing ferro nickel slag, blast furnace slag, converter slag and electric furnace slag, or by mixing a separate auxiliary material with the slag. may be In this case, the smaller the CaO content contained in the slag, the better.

Table 1 below shows the content of major components according to the type of slag.

Blast Furnace Slag steel slag Furnace Slag (oxidation) Furnace slag (reduction) ferronickel slag CaO (wt%) 41.8 46.1 13.85 44.96 0.28 SiO ₂ (wt%) 33.50 41.8 17.57 23.21 54.7 Al ₂ O ₃ (wt%) 13.6 1.5 7.45 12.98 1.93 MgO (wt%) 6.4 6.3 5.15 9.90 33.1 Others (wt%) 4.7 4.3 55.98 8.95 9.99

As shown in Table 1, it can be seen that the CaO content of ferronickel slag is very small compared to blast furnace slag, steelmaking slag, and electric furnace slag. Since CaO has a property of absorbing moisture, when a molded body is manufactured using blast furnace slag, steelmaking slag, and electric furnace slag containing a large amount of CaO, the moisture absorbed in the slag evaporates at a temperature of 100℃ or higher. do. The water evaporated in this way generates bubbles in the molded body, thereby reducing the strength of the molded body. Therefore, it is possible to manufacture a high-strength molded body by using ferronickel slag containing less CaO component than other slags alone. Alternatively, ferronickel slag, blast furnace slag, converter slag and electric furnace slag are mixed to contain 10% by weight or less of CaO based on the total weight of the slag, and the composition of the slag is adjusted and used to prepare a molded article. Alternatively, a separate auxiliary material is mixed with at least one slag of ferronickel slag, blast furnace slag, converter slag, and electric furnace slag to contain 10 wt% or less of CaO based on the total weight of the slag, and then the composition of the slag is adjusted It can also be used to manufacture a molded object. In other words, the slag used in the compact can be prepared by mixing slags having different CaO contents with each other. At this time, by mixing slag having a high CaO content and slag having a low CaO content, the CaO content may be adjusted to 10 wt% or less. Alternatively, by mixing slag having a CaO content of more than 10% by weight and _{an auxiliary material containing a large amount of SiO 2} , the slag whose CaO content is adjusted to 10% by weight or less may be used for manufacturing a molded body. For example, 10% by weight of blast furnace slag and 90% by weight of ferronickel slag and ferronickel slag are mixed with respect to the total weight of the blast furnace slag and ferronickel slag, and a molded body may be manufactured using the mixture. Alternatively, 15% by weight of electric furnace slag (oxidation) and 85% by weight of ferronickel slag are mixed with respect to the total weight of the combined electric furnace slag (oxidation) and ferronickel slag, and a molded body can be manufactured using this. At this time, the CaO content can be easily controlled by mixing electric furnace slag (oxidation) with less CaO content than blast furnace slag or steelmaking slag with ferronickel slag. As described above, a molded body can be manufactured by extruding various slags and plastics generated in the ironmaking process. Hereinafter, an example of manufacturing a molded body using ferronickel slag will be described. Ferronickel slag has a very low CaO content compared to other slags, and has a very high hardness (Mohs hardness) of 7 to 7.5 Mohs. In addition, as shown in FIG. 4, ferronickel slag is a polyhedral particle with angular ridges, and the particle shape is very irregular. When a molded article is manufactured using such ferronickel slag, the contact area between the slag particles or between the slag particles and the plastic is increased compared to slag having a spherical particle shape. Through this, the density of the ferronickel slag in the molded body is increased, and thus a high-strength molded body having excellent mechanical properties can be manufactured. In an embodiment of the present invention, an example of using ferronickel slag as slag used as a raw material for a molded body will be described, and ferronickel slag is hereinafter referred to as slag.

The particle size of the slag can be selected to produce a compact. Slag generated in the process of manufacturing ferronickel molten metal can be crushed. When the slag is crushed, 90% or more of the slag has a particle size of 6 mm or less. Among them, slag having a particle size of about 0.01 to 0.15 mm or 0.05 to 0.1 mm can be selected and used as a raw material for a molded body. At this time, the smaller the particle size of the slag, the better, but if the particle size of the slag is processed too small, the cost for crushing the slag may increase. On the other hand, when the particle size of the slag exceeds 0.15 mm, it is difficult to sufficiently secure a contact area between the slag and the plastic, so there is a problem in that it is difficult to sufficiently improve the strength of a molded article manufactured using the same.

A plastic used as a raw material of the molded body may be prepared (S120). Plastics may include thermoplastics that melt when heated and change back to a solid state when cooled. At this time, the plastic is polyethylene terephthalate (Polyethylene Terephtalate, hereinafter referred to as PET), polyethylene (Polyethylene, hereinafter, referred to as PE), polypropylene (Polypropylene, hereinafter, referred to as PP), polystyrene (hereinafter referred to as PS). , polycarbonate (hereinafter, referred to as PC), and the like. Here, the polyethylene may include high-density polyethylene (HDPE) and low-density polyethylene (LDPE). Such plastics may include waste plastics collected from domestic and industrial waste. Collected plastic, such as waste plastic, may be washed to remove impurities and then crushed. In this case, the plastic may be crushed to have a size of 5 mm or less or about 1 to 4 mm, or about 2 to 3 mm. The size of the crushed plastic may be 5 mm or less in the largest part of width, length, and thickness. If the size of the crushed plastic is too small, the crushed plastic may be scattered when it is put into the container 110 or the extruder body 212 . On the other hand, if the size of the plastic is too large, it is not easily dissolved during the extrusion process, so that the molten material of the plastic may not be formed before the modified slag is injected into the second inlet 215 . Accordingly, it is difficult to uniformly disperse the modified slag in the melt of plastic, and thus there is a problem in that the strength, quality, etc. of the molded body are deteriorated.

When the slag and the plastic are provided in this way, the slag and the plastic may be prepared in a predetermined amount in order to manufacture a molded body. At this time, with respect to the total combined slag and plastic, slag may be prepared in an amount of 20 to 90% by weight, and plastic in an amount of 10 to 80% by weight. Alternatively, with respect to the total combined slag and plastic, the slag is 40 to 70% by weight, the plastic can be prepared in about 30 to 60% by weight. If the content of the slag is too small, the content of the plastic having a lower strength than that of the slag is relatively increased, so that the mechanical strength of the molded article manufactured using the content cannot be sufficiently secured. On the other hand, when the content of the slag is excessively large, the content of the plastic that binds the slag is relatively decreased, so that the bonding force between the slags may be reduced. The content of slag and plastic may vary depending on the use of the molded article to be manufactured. For example, if the molded article is used for a purpose requiring high impact strength, the content of the plastic may be higher than that of the slag. On the other hand, when the molded article is used for a purpose requiring high flexural strength, the content of slag can be adjusted to be higher than that of plastic.

The specific gravity of the slag is about 2 to 3, and the specific gravity of the plastic is about 0.8 to 0.95. In addition, the molded article manufactured using the slag and the plastic may have a specific gravity smaller than the specific gravity of the slag and greater than the specific gravity of the plastic, for example, about 1 to 2. Therefore, the mixing ratio of the slag and the plastic can be appropriately adjusted according to the intended use of the molded body. For example, when the compact is used as a wet flooring material, the effect of buoyancy caused by rain can be reduced by increasing the specific gravity of the compact by increasing the content of slag.

On the other hand, the slag contains a large amount of at least one _{of SiO 2 and MgO and has a hydrophilic property.} On the other hand, plastic is more hydrophobic than slag. Accordingly, when slag and plastic are melt-extruded to produce a molded article, the slag and the plastic melt do not mix well like water and oil, and the slag particles agglomerate and are not uniformly dispersed in the plastic melt. Therefore, the slag can be reformed or pre-treated so that the slag can be uniformly dispersed in the melt of plastic.

Accordingly, a modifier for reforming the slag may be prepared (S112). The modifier can improve the affinity between the slag and the plastic by giving the hydrophilic slag a property similar to or identical to that of the plastic, ie, hydrophobicity. Therefore, the slag, for example, the modified slag can be uniformly dispersed in the plastic melt, and the bonding force between the slag and the plastic can be improved. The modifier may mean a coupling agent or a surface activator, and may include a silane having two types of functional groups having different reactivity in one molecule. Silane may be used by dissolving it in a solvent such as ethanol or water. When silane is dissolved in a solvent, it may be hydrolyzed by water and partially condensed to form an oligomer state, that is, a silane oligomer. The silane oligomer may be adsorbed to the slag, which is the object to be treated, through hydrogen bonding. In addition, the silane oligomer is converted into a siloxane oligomer by a dehydration condensation reaction through a subsequent drying treatment, so that it can be strongly attached or adsorbed to the surface of the slag. For example, the silane may include dimethyl silane, dimethyl dichlorosilane, 3-amino propyl tri ethoxysilane, etc., and a siloxane oligomer through the above-described reaction. It can be converted to slag and adsorbed to the slag.

The modifier may be provided in an amount of 0.1 to 0.5% by weight, or 0.2 to 0.3% by weight based on the total of the slag and the modifier. In this case, the modifier may be used in a hydrolyzed state by being dissolved in a solvent so that it can easily contact and react with the slag. For example, 0.3% by weight of dimethyl silane is prepared with respect to the entire slag, and dimethyl silane is dissolved in ethanol as a solvent to be used as a modifier. Here, the content of the modifier may mean an amount excluding the content of the solvent.

When the modifier is provided in this way, the slag may be reformed (S130).

The process of reforming the slag may include a process of spraying a solution containing a modifier onto the slag, a process of mixing the solution containing the modifier with the slag, and a process of reacting the slag with the modifier.

First, the slag whose composition and particle size are adjusted may be added to the container 110 . And a modifier, that is, a solution containing the modifier may be supplied to the inside of the container 110 . In this case, the solution may be injected into the container 110 using the nozzle 124 of the modifier supply 120 . In addition, the solution may be supplied into the container 110 in various ways. And while supplying the solution to the inside of the vessel at ambient temperature, for example, room temperature, the slag may be stirred. As described above, the slag may be stirred by rotating the vessel 110 , or the slag may be stirred using the stirrer 140 . Alternatively, the vessel 110 and the stirrer 140 may be rotated to stir the slag. Accordingly, the slag accommodated in the container 110 is mixed with the solution containing the modifier, and the modifier, that is, the solution containing the modifier may be attached or contacted on the surface of the slag. When the modifier is attached to the slag, the slag and the modifier react with each other at room temperature, and a reactant formed by the reaction may be formed on the surface of the slag.

Thereafter, the supply or spraying of the modifier may be stopped, and the slag and the modifier may be stirred for about 5 to 20 minutes, or 10 to 15 minutes so that the slag and the modifier can sufficiently react. And the slag reacted with the modifier may be dried by heating. The drying process may be performed by heating the container 110 with the first heating means 130 . The drying process may be conducted at a temperature above the boiling point of the solvent used to prepare the modifier. For example, when ethanol having a boiling point of 78° C. is used as a solvent, the drying process may be performed at about 80 to 100° C. or 85 to 95° C. higher than the boiling point of ethanol. And when water having a boiling point of 100° C. is used as the solvent, the drying process may be performed at about 110 to 120° C. higher than the boiling point of water. The temperature range in which the drying process is performed may be variously changed depending on the type of solvent used to prepare the modifier. When the slag reacted with the modifier is dried as described above, the siloxane oligomer generated by the reaction of the slag and the modifier is dehydrated and condensed to form a coating film on the entire or part of the surface of the slag. Due to this, the surface of the slag can have the same hydrophobicity as plastic. The coating film may be formed to have an extremely thin thickness of 10 nm or less on the surface of the slag.

When the reforming or pre-treatment of the slag is completed in this way, a molded body may be manufactured using the modified slag and plastic. Referring to FIG. 3 , the process of manufacturing the molded body includes a process of injecting plastic into the extruder body 212 ( S141 ), a process of melting the plastic ( S142 ), and a process of injecting modified slag into the plastic melt ( S143 ). ) and extruding while dispersing the modified slag in the plastic melt to manufacture a molded body (S144).

Prior to extruding the slag and plastic, the extruder body 212 may be heated. The extruder body 212 may be heated by the second heating means 240 , and may be heated to a temperature higher than the melting point of the plastic, for example, 50 to 100° C. higher than the melting point of the plastic. For example, in the case of manufacturing a molded body using PE having a melting point of about 130°C, the extruder body 212 may be heated to about 180 to 230°C. Alternatively, when a molded article is manufactured using PET having a melting point of about 240°C or PET is contained in the plastic injected into the extruder body 212, the extruder body 212 may be heated to about 290 to 340°C. And the extruder body 212 may be heated so that the temperature of the plastic injection side is lower than the modified slag injection side or the plastic and the modified plastic mixture is extruded. This is to uniformly disperse the modified slag in the plastic melt by sufficiently melting the plastic to lower the viscosity of the plastic melt because the modified slag is added to the plastic melt.

When the extruder body 212 is sufficiently heated, the plastic may be injected into the first inlet 214 of the extruder body 212 . When the plastic is injected into the extruder body 212, additives such as compatibilizers, UV stabilizers and colorants may be added as necessary. For the plastic, one of PET, PE, PP, PS and PC may be injected, or two or more plastics may be injected. Most of these plastics have hydrophobicity, but PET has hydrophobicity and hydrophilicity. Therefore, when PET and at least one of PE, PP, PS, and PC are mixed and used in manufacturing a molded article, a problem that plastics do not mix well may occur. For example, PET and PE do not mix as well as water and oil because PET has hydrophilicity and PE has hydrophobicity. Accordingly, when PET and PE are melt-extruded, PET and PE do not mix well, and PET and PE form lumps, respectively, to form an interface between PET and PE. In a molded article manufactured using these, an interface may be formed between PET and PE. Therefore, the molded body is prone to cracks or to be destroyed by external force. In order to solve this problem, in the case of manufacturing a molded article using two or more plastics having different physical properties, a compatibilizer that allows the plastics to mix well with each other may be used. The compatibilizer is used to mix well when high molecular substances having different physical properties are dissolved, and can play the same role as a surfactant that mixes water and oil well. The compatibilizer may further increase the strength of the molded article by suppressing the formation of an interface between different types of plastics when the molded article is cooled. The compatibilizer may include an epoxy functional group capable of reacting with a hydroxyl group (-OH), a carboxyl group (-COOH) of PET, and a maleic anhydride functional group. As such, since the compatibilizer reacts with PET, it may be used in an amount of 1 to 5% by weight based on the content of PET contained in the plastic. Through this, when a molded article is manufactured using plastics having different physical properties, such as PET and PE, since PET reacts with a compatibilizer and is modified to have properties similar to PE, an interface between PET and PE is not formed and is mixed evenly can be In this case, the compatibilizer reacts with PET and does not react with PE, and may be located between PET and PE in the molded body.

In addition, depending on the use of the molded article, a colorant, an ultraviolet stabilizer, or the like may be additionally used. For example, when color is imparted to the molded article for aesthetics, a colorant may be further used, and when the molded article is used in a portion exposed to sunlight, a UV stabilizer may be further used. In this case, the additive may be used in an amount of 0.01 to 0.05 parts by weight when the entire molded body is 1. When the content of the additive is too small, the effect of the additive cannot be sufficiently exhibited. On the other hand, when the content of the additive is too large, the cost due to the use of the additive increases, and the content of the additive in the molded article increases, thereby reducing the strength of the molded article.

When the additive is prepared as described above, at least one of a compatibilizer, a UV stabilizer, and a colorant may be mixed with plastic as necessary and injected into the extruder body 212 through the first injection port 214 . The plastic may move while being melted toward the outlet 216 of the extruder body 212 by the rotation of the screw 230 .

After injecting plastic or plastic and additives into the extruder body 212 , the modified slag may be injected through the second inlet 215 of the extruder body 212 . The reformed slag may be injected into the extruder body 212 after the plastic is melted to form a plastic melt, and the plastic melt passes through at least the lower portion of the second inlet 215 . This is because, when the modified slag is in direct contact with the inner surface of the extruder body 212, the inner surface of the extruder body 212 may be worn or damaged by the slag of high hardness. When the reformed slag is injected into the plastic melt, the plastic melt acts as a lubricating agent to suppress or prevent direct contact of the modified slag with the inner surface of the extruder body 212 . Therefore, it is possible to suppress the inner surface of the extruder body 212 from being worn or damaged, thereby improving the lifespan of the extruder body 212 and extending the maintenance period or replacement period.

The reformed slag may be heated to a temperature above the melting point of the plastic before being injected into the extruder body 212 and then injected into the extruder body 212 . This is because when the temperature of the reformed slag has a temperature lower than the melting point of the plastic, the temperature of the plastic melt decreases due to the temperature difference with the reformed slag. When the temperature of the plastic melt is lowered, there is a problem in that the modified slag is not uniformly dispersed in the plastic melt because the viscosity of the plastic melt increases or a solid is formed. Therefore, the reformed slag may be heated to a temperature above the melting point of the plastic or to the temperature of the heated extruder body 212 to be injected into the extruder body 212 .

As such, when the plastic and the modified slag or plastic, the additive and the modified slag are injected into the extruder body 212, the melt of the plastic and the modified slag are moved toward the outlet 216 by the rotation of the screw 230, The reformed slag can be uniformly dispersed in the plastic melt. That is, since the surface of the modified slag has hydrophobicity, which is the same property as plastic, by the modifier, wettability by the plastic melt can be improved. The slag modified thereby can be easily incorporated into the plastic melt, and can be uniformly dispersed in the plastic melt.

And the plastic melt in which the modified slag is uniformly dispersed, that is, the mixture of the modified slag and the plastic melt may be extruded out of the extruder body 212 through the die 220 to manufacture a molded body. The molded body may be continuously manufactured while continuously injecting the plastic and the modified slag prepared in this way into the first inlet 214 and the second inlet 215 . After the molded body extruded through the die 220 is cooled, it may be cut to a predetermined length or a target length using the cutting unit 300 installed to be spaced apart from the die 220 . 5 (a) is a photograph showing a state in which the molded body extruded through the die 220 is cut, and shows an example in which the molded body is formed in a hexahedral shape. The shape of the molded body or product may be variously changed according to the inner shape of the die 220 . In this way, a molded body can be manufactured in large quantities using slag and plastic.

Here, a method for manufacturing a molded body by extruding a mixture of plastic and modified plastic through the die 220 has been described, but a separate mold (not shown) is connected to the die 220, and the extruded plastic and the modified plastic Plastic, for example, a slag-plastic composite may be injected into the mold to be reprocessed (S145). 5 (b) shows a molded article manufactured using a mold, and in addition, molded articles or products having various shapes can be manufactured according to the mold.

When the molded body is manufactured in this way, the slag can be uniformly dispersed in the plastic melt, so that the high strength and high quality molded body can be manufactured. In addition, by preventing the extruder body 212 and the screw 230 from being worn by the slag, the durability and service life of the extruder body 212 and the screw 230 can be improved. In addition, by manufacturing high value-added products such as building materials and civil engineering materials using waste slag and waste plastics, it is possible to reduce environmental pollution caused by waste and reduce construction costs.

Hereinafter, an experimental example for verifying the mechanical properties of the molded article manufactured by the method for manufacturing the molded article according to an embodiment of the present invention will be described.

The slag, plastic and modifier were prepared to produce the molded body. At this time, the slag was prepared to have an average particle size of 0.1 mm or less by crushing and screening ferronickel slag. The plastic was prepared so that the thickness of 100 to 200㎛ by crushing each waste vinyl containing high-density polyethylene (HDPE), and the length or width is 3 mm or less. And the modifier was prepared as a solution in which 3 g of polydimethyl silane was dissolved in 100 g of ethanol. Each of the experimental examples described below was performed using slag, plastic, and modifier having the same conditions.

Experimental Example 1

997 g of slag was put into a container, and a solution containing a modifier was supplied into the container while stirring the slag. Then, the slag and the modifier were reacted by stirring the slag and the modifier at ambient temperature, that is, at room temperature for 10 minutes. Thereafter, 1000 g of reformed slag was obtained by heating the vessel to 80° C. to evaporate ethanol adhering to the slag. And the reformed slag was heated to about 220 to 240 ℃.

Thereafter, 1000 g of plastic and 1000 g of the modified slag were injected into the extruder body heated to a temperature above the melting point of the plastic, and a mixture of the plastic and the modified slag was extruded. At this time, the temperature of the first inlet side of the extruder body was maintained at 210 to 230 ℃, and the temperature at the die side was maintained at 240 to 280 ℃.

Then, the extruded mixture was cooled using a separate mold to prepare a molded body having a size suitable for strength measurement.

Experimental Example 2

The slag was reformed in the same manner as in Experimental Example 1, and 1500 g of plastic and 1000 g of the modified slag were injected into the extruder body. And a molded article was prepared in the same manner as in Experimental Example 1.

Experimental Example 3

The slag was reformed in the same manner as in Experimental Example 1, and 2000 g of plastic and 1000 g of the modified slag were injected into the extruder body. And a molded article was prepared in the same manner as in Experimental Example 1.

Experimental Example 4

1000 g of plastic and 997 g of unmodified slag were mixed at room temperature, and the mixture was injected into the extruder body through the first inlet. And a molded article was prepared in the same manner as in Experimental Example 1.

Experimental Example 5

1000 g of plastic was injected into the extruder body through the first inlet, and 997 g of unmodified slag was heated to 220 to 240° C., and then injected into the extruder body through the second inlet. And a molded article was prepared in the same manner as in Experimental Example 1.

The flexural strength and impact strength of each of the molded articles prepared by Experimental Examples 1 to 5 were measured. Flexural strength was measured according to KS M ISO 178, and impact strength was measured according to KS M ISO 179-1. Table 2 below shows the results of measuring the flexural strength and impact strength of each molded article.

Slag content (g)
(ferronickel slag) Plastic content (g)
(HDPE) slag reforming slag heating Individual slag/plastic input flexural strength
(MPa) impact strength
(kj/㎡) Experimental Example 1 997 1000 ○ ○ ○ 35.8 4.3 Experimental Example 2 997 1500 ○ ○ ○ 33.5 4.9 Experimental Example 3 997 2000 ○ ○ ○ 30.1 5.4 Experimental Example 4 997 1500 × × × 10.5 1.8 Experimental Example 5 997 1500 × ○ ○ 13.6 1.7

Looking at Table 2, Experimental Examples 1 to 3, in which a molded article was prepared using the modified slag, were significantly higher in flexural strength and impact strength than in Experimental Examples 4 and 5 in which a molded article was prepared using unmodified slag. It can be seen that the measurement is very high. This is because, in the case of Experimental Examples 1 to 3, the slag was modified to have properties similar to or identical to those of plastic and used. That is, the modified slag is imparted with hydrophobicity to its surface, so that adhesion or bonding force with the plastic melt having hydrophobicity is improved, and it can be easily incorporated into the plastic melt. The modified slag can be uniformly dispersed in the plastic melt, and can be well maintained in a bonded state without being separated from the plastic melt. For this reason, it is judged that the molded articles manufactured by Experimental Examples 1 to 3 exhibited higher flexural strength and impact strength compared to the molded articles manufactured by Experimental Examples 4 and 5. However, in the case of Experimental Examples 4 and 5, in the process of extruding plastic and slag particles having different surface properties, the slag particles were not uniformly dispersed in the placenta, indicating that sufficient flexural strength and impact strength were not expressed. is judged

Meanwhile, in Experimental Examples 4 and 5, molded articles were prepared using unmodified slag. However, in Experimental Example 4, the impact strength was measured to be 0.1 kj/m2 higher than in Experimental Example 5, but the flexural strength was measured to be lower by about 3 MPa. That is, it can be seen that Experimental Examples 4 and 5 have similar impact strength, but have a large difference in flexural strength. In Experimental Example 4, a molded article was manufactured using slag and plastic in a conventional manner, because slag and plastic having different properties were not uniformly mixed while extruding. On the other hand, in Experimental Example 5, although the slag was not reformed, the plastic was melted and then heated slag was injected into the plastic melt, so that the slag was well dispersed in the plastic melt compared to Experimental Example 4.

Combining the above results, it can be seen that mechanical properties such as flexural strength and impact strength of the molded body can be improved by modifying the slag to have properties similar to plastic and then manufacturing the molded body. In addition, it was confirmed that when plastic is melted and then slag is injected into the plastic melt, a high-quality molded article having superior mechanical properties can be manufactured than when a mixture of slag and plastic is melt-extruded.

Although the present invention has been described with reference to the accompanying drawings and the above-described preferred embodiments, the present invention is not limited thereto, and is defined by the claims to be described later. Accordingly, those of ordinary skill in the art can variously change and modify the present invention within the scope without departing from the spirit of the claims to be described later.

100: reforming unit 110: container
120: modifier supplier 130: first heating means
200: molding unit 212: extruder body
220: die 230: screw
240: second heating means 300: cutting part

Claims (26)

a reforming unit for reforming slag; and
A molding unit for producing a molded body by extruding the modified slag and plastic;
The reforming unit,
By adsorbing the plastic and a modifier that has affinity with the slag and can react with the slag on the surface of the slag having properties different from those of the plastic, the surface of the slag is modified to have the same properties as the plastic Molded body manufacturing equipment that can do this. The method according to claim 1,
The reforming unit,
a container forming a space capable of accommodating the slag therein;
a modifier feeder capable of supplying a modifier for reforming the surface of the slag to the vessel; and
A molded article manufacturing facility comprising a; a stirrer installed in the container to stir the slag. The method according to claim 1,
The reforming unit,
a container that is rotatable and forms a space capable of accommodating the slag therein; and
A molded article manufacturing facility comprising a; a modifier supply unit capable of supplying a modifier for reforming the surface of the slag to the container. 4. The method of claim 2 or 3,
The reforming unit includes a first heating means formed in the container to heat the slag. The method according to claim 1,
The molding part,
An extruder having a space formed therein, a first inlet for injecting the plastic, a second inlet for injecting the reformed slag, and an outlet for discharging a mixture containing the reformed slag and the plastic body;
a screw formed in the extruder body to move the reformed slag and the plastic from the first inlet and the second inlet to the outlet;
a die formed to have an inner diameter smaller than the inner diameter of the extruder body and connected to the outlet;
a second heating means formed in the extruder body; and
Including; a control unit capable of controlling the second heating means;
The second inlet is a molded body manufacturing facility formed between the first inlet and the outlet. preparing raw materials including slag, plastics and modifiers;
modifying the surface of the slag with the modifier to have the same properties as the plastic; and
The process of producing a molded body by extruding a mixture containing the modified slag and the plastic;
The process of preparing the raw material includes the process of preparing a modifier that has affinity for the plastic and the slag and can react with the slag,
The process of modifying the surface of the slag may include reacting the slag with the modifier to adsorb the reactant by the reaction on the surface of the slag. 7. The method of claim 6,
The process of preparing the raw material includes a process for adjusting a component of adjusting the CaO content of the slag. 7. The method of claim 6,
The process of preparing the raw material is,
the process of collecting waste plastics; and
The process of crushing the waste plastic; molded body manufacturing method comprising a. 7. The method of claim 6,
The process of preparing the raw material is,
A method for manufacturing a molded body comprising the step of preparing the modifier in a solution state. 10. The method of claim 9,
The process of reforming the surface of the slag,
spraying the modifier into the slag;
mixing the modifier and the slag; and
A process for producing a molded body comprising a; the process of reacting the slag and the modifier at atmospheric temperature. 11. The method of claim 10,
The process of preparing the modifier,
A method for producing a molded article comprising a step of dissolving 0.1 to 0.5 wt% of a modifier in a solvent based on the total of the slag and the modifier to prepare a liquid state. 12. The method of claim 11,
The process of reforming the surface of the slag,
and drying the reformed slag by reacting with the modifier,
The drying process includes heating the reformed slag to a temperature higher than the boiling point of the solvent. 13. The method of claim 12,
The process of reforming the surface of the slag,
A method for producing a molded body comprising the step of imparting hydrophobicity to the slag. 14. The method according to any one of claims 6 to 13,
The process of manufacturing the molded body,
dissolving the plastic to prepare a plastic melt;
When the plastic melt is prepared, the process of injecting the modified slag into the plastic melt;
dispersing the reformed slag in the plastic melt; and
The process of extruding the plastic melt in which the modified slag is dispersed; 15. The method of claim 14,
The process of preparing the plastic melt includes a process of adding at least one of a compatibilizer, a colorant, and a UV stabilizer. 15. The method of claim 14,
The process of manufacturing the molded body,
Prior to the process of injecting the modified slag into the plastic melt, the method of manufacturing a molded body comprising the step of heating the modified slag to a temperature greater than or equal to the melting point of the plastic. 15. The method of claim 14,
The extrusion process is
and maintaining the plastic melt and the modified slag at a temperature equal to or higher than the melting point of the plastic. 7. The method of claim 6,
The process of preparing the raw material includes the process of preparing ferronickel slag generated in the process of manufacturing ferronickel molten steel. plastic;
slag disposed to be dispersed in the form of particles in the plastic; and
Including; a modifier chemically bonded to the slag and positioned between the slag and the plastic;
The modifier has affinity with the plastic and the slag, and includes a reactant produced by reaction with the slag and adsorbed on the surface of the slag. 20. The method of claim 19,
The slag is a molded body containing 10% by weight or less of CaO based on the total amount of the slag. 21. The method of claim 19 or 20,
The slag includes at least one of blast furnace slag, steelmaking slag and ferronickel slag,
The plastic is a molded body including waste plastic. 22. The method of claim 21,
The slag has a particle size of 0.01 to 0.15 mm. 22. The method of claim 21,
The slag is a molded body comprising angled polyhedral particles. 22. The method of claim 21,
The reactant is a molded article comprising a siloxane oligomer. 22. The method of claim 21,
The plastic is a molded article comprising one of polyethylene terephthalate (PET), polyethylene (PolyEthylene, PE), polypropylene (PolyPropylene, PP), polystyrene (PS) and polycarbonate (PolyCarbonate, PC). 22. The method of claim 21,
The plastic comprises two or more of polyethylene terephthalate (PET), polyethylene (PolyEthylene, PE), polypropylene (PolyPropylene, PP), polystyrene (PolyStyrene, PS) and polycarbonate (PolyCarbonate, PC),
A molded article further comprising a compatibilizer positioned between two or more plastics.

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