KR20020091556A - Waste polyethylene plastic compounds reinforced with incinerated fly-ashes, and methods of manufacturing goods using them - Google Patents

Abstract

The present invention has been researched and developed to solve the conventional problems caused by recycling waste plastic waste as a raw material, recycling the resources by mixing and reprocessing waste polyethylene (multi-layer composite film) plastic and incineration ash (incineration fugitive dust). And an incineration circuit-reinforced high strength waste polyethylene plastic composition capable of increasing tensile strength, tensile modulus and flexural modulus even with a simple structure together with environmental protection, and a method of manufacturing a molded article using the same.

The high-strength waste polyethylene plastic composition is a waste polyethylene plastic molded product which is formed by pulverizing, melting (softening) waste polyethylene plastic wave support material, and processing 95 to 70 wt% waste by kneading and processing 5 to 30 wt% incineration ash. And polyethylene glycol and 5 to 30% by weight of incineration ash, wherein the incineration ash is preferably limited to 15 to 25% by weight, and the pure polyethylene polymer raw material is used instead of the waste polyethylene plastic phage raw material. By further comprising up to 50% by weight may further supplement the original polyethylene properties.

Description

Waste polyethylene plastic compounds reinforced with incinerated fly-ashes, and methods of manufacturing goods using them}

The present invention relates to a high-strength waste polyethylene (multilayer composite film) plastic composition reinforced by incineration ash (incineration fly ash dust) and a method for producing a molded article using the same, and more particularly, by mixing and reprocessing waste polyethylene plastic and incineration ash. The present invention relates to an incineration circuit-strengthened high strength waste polyethylene plastic composition capable of increasing tensile strength, tensile modulus and flexural modulus even with a simple structure with recycling and environmental protection.

Waste plastics are representative of various synthetic plastics. Polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyester, and the like are mixed, and they are almost decomposed and remain in their original state for a long time in the air or in water. , It causes disadvantages such as landfill. In addition, when burned to treat plastics, high heat is emitted, but there is a problem in that a large amount of air is required during combustion, and harmful gases and soot are generated.

Therefore, recycling and recycling waste plastics has not only solved pollution problems but also a lot of research and development in terms of recycling resources.

Among them, "Plastic composition obtained from mixed waste plastic and waste fiber and its molded article" disclosed in Japanese Patent Application Laid-Open No. 2000-0072326 is a waste rayon, a waste surface, or a waste paper mixed with a mixed waste plastic mixed with waste plastics. After the addition of waste cellulose (waste cellulose), such as sawdust to dissolve to obtain a plastic composition, it is injected or extruded to produce a plastic molding having a tubular or plate-like shape. The plastic composition of the present invention and its moldings are cheaper, harder and harder than the plastics themselves and can be used in artificial wood, formwork, fences and various construction and civil engineering materials and contribute to the recycling of waste plastics.

In addition, "Multi-layered plastic fume pipe using waste plastic and its manufacturing method and apparatus", which was invented by one of the applicants and filed in 1999 Patent Application No. 21280, uses an inner pipe (endothelium by regenerating waste plastic wave support material). ) To form a plastic fume pipe by forming a structure and extruding and bonding the plastic wave support material, which is not recycled, to the outer surface of the endothelium, and collecting and crushing the collected waste plastic wave support material (polyethylene, nylon, polypropylene, etc.) 300 It is made to form a spiral tubular shape by heating, mixing, melting, and extruding at a temperature before and after the temperature of 3 ° C. for 7 minutes, and extruding and forming the shell thereon to obtain strength and to enhance the appearance.

However, molding a plate or tubular product with waste plastic grips has a problem that the tensile strength and tensile modulus (or flexural modulus) are lower than that of a product processed from synthetic resin that has not been recycled.

Accordingly, the present invention has been researched and developed in order to solve the conventional problems caused by recycling the above-mentioned waste plastic phage as a raw material, and a simple structure with recycling of resources and environmental protection by mixing and reprocessing waste polyethylene plastic and incineration ash. The present invention also provides a high strength waste polyethylene plastic composition reinforced by incineration, which can increase tensile strength, tensile modulus, and flexural modulus, and a method of manufacturing a molded article using the same.

Furthermore, the present invention is a high-strength waste polyethylene plastic composition reinforced by incineration so that not only waste plastic but also incineration ash (flying dust) remaining after incineration of general wastes can be recycled without having to worry about the landfill problem, and molded articles using the same. It is an additional object to provide a manufacturing method.

1 is a part of the manufacturing apparatus for explaining the manufacturing method of the plastic fume pipe of the two-layer structure is a high-strength waste polyethylene (multilayer composite film) plastic molded reinforced by incineration ash (incineration dust scattering) according to an embodiment of the present invention Showing a configuration diagram,

FIG. 2 is a schematic diagram illustrating an embodiment of a tertiary melter for supplying, extruding, and recycling waste polyethylene plastic and incineration ash in FIG. 1;

Figure 3 is a schematic configuration diagram showing an embodiment of the shell extrusion apparatus for extruding the shell,

FIG. 4 is a schematic enlarged schematic view showing a portion of a double screw for heating, conveying and pulverizing primary and secondary crushing melters of the extrusion apparatus of FIG.

5 is a front view showing the external structure of the distribution box of FIG.

Explanation of symbols on the main parts of the drawings

1: plastic fume tube 2: endothelial

3: jacket 10: endothelial extruder

10a: 3rd twin screw extruder 10b, 10c: 2nd and 1st twin screw extruder

14a, 14b, 14c: Double screw part 14d: Boiler part (heating burner part)

14e, 16b: electric heater 14 ': cylinder

16: Inlet tube 17: Inlet

18: dispenser 19: extrusion roller

20: shell extruder 30: tensioner

31: rotary roller

In order to achieve this object, an incineration circuit-reinforced high strength waste polyethylene plastic composition according to one embodiment of the present invention is used for waste polyethylene plastic composition formed by grinding and melting (softening) waste polyethylene plastic wave support material (multilayer composite film). It is characterized in that it comprises 95 to 70% by weight of waste polyethylene plastics and 5 to 30% by weight of incineration ash by mixing, regenerating and processing incineration ash (incinerator fly ash dust) of 5 to 30% by weight. .

In this case, the incineration ash is preferably limited to 15 to 25% by weight, and the pure polyethylene polymer raw material is further included up to 50% by weight instead of the waste polyethylene plastic wave support so that the original polyethylene properties can be further supplemented. do.

The present invention is a method for producing a waste polyethylene plastic composition, which is formed by pulverizing, melting (softening) waste polyethylene plastic wave support material, selecting only waste polyethylene plastic waste, and mixing incineration ash of 5 to 30% by weight. It provides an incineration circuit reinforced high strength waste polyethylene plastic molded article characterized in that it comprises a step of mixing, crushing, melting at least once by a screw extruder.

After such a step, the molten incineration mixed waste polyethylene plastic is put into a mold to cool to a certain shape, a molten molding step, an extrusion processing step of extruding with a screw and cooling to a desired shape, and a compression processing step of pressing. By including the high-strength waste polyethylene plastics molded directly reinforced by incineration can be produced, it is also possible to be used as a raw material for injection by pulverizing the pellets of high-strength waste polyethylene reinforced by incineration in the above-described step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention has been made through a variety of reprocessing by mixing the waste polyethylene plastic containing waste vinyl and coal ash to incineration ash, the experimental examples are as follows.

Experimental method, using a twin-screw extruder (Twin-Screw Extruder) as shown in Figure 1 after obtaining the waste polyethylene plastic plate (heating temperature of the twin screw extruder was maintained at 150 to 300 ℃) crusher Crushed in. In addition, by using a test twin screw extruder, a mixture of waste polyethylene resin and filler (coal ash or incineration ash) was prepared for each 900g of samples for each condition (the heating temperature of the twin screw extruder was maintained at 150 to 250 ° C). Broke again. After that, a specimen suitable for the tensile test and the bending test was prepared using a small injection molding machine. At this time, the cooling water temperature of the mold was 30 to 70 ℃, the mold time is 1 to 3 minutes, the heating temperature of the injection machine was maintained at 200 to 300 ℃. Tensile test was performed to determine the maximum stress (tensile stress at yield point), maximum stress point elongation, elongation at break and slope (tensile modulus) (tensile test was performed at Instron 4466 (Series IX, V1022) at a temperature of about 10 ° C). The crosshead speed was tested at 50 mm / min). Flexural modulus and maximum stress (bending stress at yield point) were measured by the flexural test. (The flexural test was performed at 23 ° C. with an Instron 6022 apparatus at a support interval of 50 mm and a pressure rod moving speed of 13 mm / min.).

In the first experiment, LDPE as a raw material was used as a filler (Filler), and coal ash (Fly-Ash, containing 15% unburned carbon) and incineration ash (powder collected from incinerator exhaust gas) as fillers (5 to 30% by weight). The results of the experiment with different) showed that the tensile modulus (tilt) increased from 34 to 36 Kgf / mm to 41 to 42 Kgf / mm and the flexural modulus increased from 80 Kgf / mm2 to 97 to 105 Kgf / mm2, but the tensile strength (maximum stress) Decreased from about 2.42 Kgf / mm 2 to 2.1 to 2.3 Kgf / mm 2. Therefore, even forming pure LDPE mixed with coal ash or incineration ash did not improve both elastic modulus and tensile strength.

Next, in the second experiment, 10 wt% twin screws (waste polyethylene as a raw material) were filled with coal ash (Fly-Ash thermal power plant, containing 15% unburned carbon) and incineration ash (powder collected from the incinerator exhaust). ), And then crushed, melted, molded, and tested, as shown in Table 2 and Table 3 (Table 1 is an experimental result for waste polyethylene alone). As a result, 10% by weight of coal ash was included. As shown in Table 2, the tensile modulus increased from an average of 16.04 Kgf / mm to an average of 17.212 Kgf / mm, and the flexural modulus increased from an average of 27 Kgf / mm2 to an average of 34 Kgf / mm2, but the tensile strength (maximum stress) was average. It decreased from 1.21 Kgf / mm 2 to 1.1378 Kgf / mm 2. Therefore, it was found that even when molded from waste polyethylene plastic mixed with coal ash, both elastic modulus and tensile strength could not be improved at the same time. However, in case of containing 10% by weight of incineration ash, the tensile modulus increases from 16.04 Kgf / mm to 19.40 Kgf / mm on average, and the flexural modulus increases from 27 Kgf / mm2 to 36 Kgf / mm2 on average, and the tensile strength (maximum stress ) Increased from 1.21 Kgf / mm 2 to 1.262 Kgf / mm 2 on average. Therefore, it was found that molding of waste polyethylene plastic mixed with incineration ash improved both elastic modulus and tensile strength.

In the second experiment, under the same conditions, 30% by weight of pure LDPE and 50% by weight with respect to 0% and 10% by weight of coal ash and incineration ash as fillers were mixed with twin screws. , Crushed, melted, molded, and tested, as shown in Tables 4 to 9, and as a result, when containing 10% by weight of coal ash, the tensile modulus as shown in Table 5 and Table 8 average 21.272Kgf / mm And 23.542 Kgf / mm and 28.805 Kgf / mm from 24.92 Kgf / mm and flexural modulus increased from 38 Kgf / mm 2 and 52 Kgf / mm 2 to 44 Kgf / mm 2 and 55 Kgf / mm 2 on average, but tensile strength (maximum stress) The average decrease was 1.661 Kgf / mm 2 and 1.9185 Kgf / mm 2 to 1.546 Kgf / mm 2 and 1.7898 Kgf / mm 2. Therefore, it can be seen that even when the coal ash is mixed with the waste polyethylene plastic and the pure LDPE, it does not improve both the modulus and the tensile strength. However, in the case of the incineration ash, the tensile modulus is 21.272 Kgf / mm on average. And 24.92 Kgf / mm to 25.942 Kgf / mm and 29.688 Kgf / mm, flexural modulus increases from 38Kgf / mm2 and 52Kgf / mm2 to 44Kgf / mm2 and 57Kgf / mm2 on average, as well as tensile strength (maximum stress ) The average reduction ratio was 1.6835 Kgf / mm2 and 1.9185 Kgf / mm2 to 1.5835 Kgf / mm2 and 1.8212Kgf / mm2, indicating that the reduction ratio was insignificant compared to coal ash. It turns out that you can.

In order to know the results of the various ratios for the incineration ash in the third experiment inferred from the above results, the experiments were conducted with 0% by weight, 10% by weight and 20% by weight of incineration ash as a filler in waste polyethylene plastic as a raw material. Tables 10 to 12 show that the tensile modulus increased from an average of 14.35 Kgf / mm to 19.37 Kgf / mm and 26.75 Kgf / mm when the incineration ash was increased from 0% by weight to 10% and 20% by weight. In addition, the tensile strength (maximum stress) also increased from 1.127 Kgf / mm2 to 1.202 Kgf / mm2 and 1.292 Kgf / mm2 on average. When incineration was more than 30% by weight, moldability was deteriorated. . Accordingly, it was found that the addition of incineration ash to 5 to 30% by weight of waste polyethylene plastic has the strength of the waste polyethylene plastic molded article.

The difference in the values of Table 1 and Table 10 above is determined to be due to the difference in the type of plastic contained in the waste polyethylene according to the experimental order. In other words, the composition of the raw material is different or the mixing effect is considered (the tensile strength (maximum stress) and the modulus of elasticity increase similarly with the increase of the filler input).

Experimental results of 0% by weight, 10% by weight and 20% by weight of incineration ash as a filler for 50% by weight of pure LDPE and 50% by weight of waste polyethylene plastics were shown in Tables 13 to 15. is increased to 10 wt% and 20 wt% from a tensile elastic modulus, but a significant 27.27Kgf / mm and 32.85Kgf / mm increase from the average 23.35Kgf / mm (average flexural modulus is 52Kgf / from mm ² 61Kgf / mm ² and 70Kgf / mm ² ), tensile strength (maximum stress) slightly decreased from 1.929 Kgf / mm 2 to 1.901 Kgf / mm 2 and 1.830 Kgf / mm 2. Accordingly, it was found that the addition of incineration ash to each of 5 to 30% by weight of waste polyethylene plastic and 50% by weight of pure LDPE also had the strength of the waste polyethylene molded plastic product. In addition, the fracture curve singularity (Rubber characteristics) observed in Table 5 (when 10% by weight of coal ash was added to 70% by weight of waste polyethylene plastic and 30% by weight of pure LDPE mixed resin) was observed, and the occurrence frequency was increased with increasing filler input. It can be seen that increases.

On the other hand, it is preferable that the kneading and processing apparatus is configured to volatilize the solvent, such as printing materials contained in waste polyethylene plastics such as food packaging vinyl.

Waste polystyrene plastics mixed with incineration ash as described above, it is possible to produce a plastic fume tube of a two-layer structure through the device shown in Figures 1 to 5 by grinding or crushing it. That is, the collected waste plastic wave support material (polyethylene, nylon, polypropylene, etc.) is sorted, and the waste polyethylene plastic is pulverized and introduced into the raw material inlet (12c) with incineration ash of about 20% by weight, and the first twin screw extruder (10c). Crushed, melted (softened), and conveyed, and mixed by heating at a temperature of about 300 ° C. by the boiler portion (heating burner portion) 14d while being crushed by the twin screw portion 14c. . The heat source of the boiler portion (heating burner portion) 14d can be heated by gas, oil or waste materials at the time of introduction (see Fig. 2). In FIG. 1, such a step is transferred to the secondary and tertiary twin screw extruders 10b and 10a over three times to be mixed and crushed to be sufficiently homogenized by the twin screw units 14b and 14a, and at the same time, the boiler unit ( The heating burner portion 14d is continuously heated to a temperature of about 300 ° C. to be melted (softened), and the molten waste plastic support material is fed into the distribution box 18 while maintaining the temperature at around 250 ° C. It is preferable that the cylinder outer temperature, which is the screw body of the twin screw portions 14c and 14b, is maintained at about 400 ° C, and the cylinder outer temperature of the third twin screw extruder is maintained at about 300 ° C.

Thereafter, the dispenser 18 is extruded into the tensioner 30 while cooling with the feed amount controlled by the pair of rollers, and the tensioner 30 is rotated using waste polyethylene plastic in the tensioner 30. As the extruded waste polyethylene plastic wave support material forms the inner shell 2 of the spiral structure, the pipe is molded and primarily cooled, and is pushed out of the tensioner 30 to form a spiral tube.

It is possible to form the shell 3 by extruding the molten plastic raw material on the outer surface of the inner shell 2 of the spiral pipe structure which is first cooled and pushed out on the tensioner 30 using the shell extruder 20.

As described above, an apparatus and a method for manufacturing a plastic fume tube having a two-layer structure as an incineration circuit-reinforced high-strength waste polyethylene molded article of the present invention are shown and described, but the present invention is not limited to such a product, and all conventional regeneration methods Can be applied to In other words, the melt molding method of heating waste plastic to make it into a molten state and putting it into a mold to cool it to a certain form. It may be used for compression processing, softening waste plastics, and pressing.

According to the constitution and function of the incineration circuit-reinforced high strength waste polyethylene plastic molded article according to the embodiment described above and the manufacturing method thereof, the incineration ash is filled, mixed, crushed, melted and reprocessed rather than the waste polyethylene plastic alone. In addition to obtaining a high-cost, high-quality waste polystyrene plastic molded article at low cost, it is possible to recycle resources as much as possible and to protect the environment.

Claims (4)

In the waste polyethylene plastic molded article formed by grinding and melting (softening) waste polyethylene plastic wave support material (multilayer composite film), An incineration circuit comprising 95 to 70% by weight of waste polyethylene plastics and 5 to 30% by weight of incineration ash by mixing and regenerating and processing 5 to 30% by weight of incineration ash (incinerator fly ash dust) Reinforced high strength waste polyethylene plastic composition and molded articles using the same. The incineration circuit reinforced high-intensity waste of claim 1, wherein the incineration ash is limited to 15 to 25% by weight, and the pure polyethylene polymer raw material further comprises up to 50% by weight instead of the waste polyethylene plastic wave support material. Polyethylene plastic composition and molded article using the same. In the manufacturing method of the waste polyethylene plastic molded article which is formed by grinding, melting (softening) the waste polyethylene plastic wave support material, Selecting only waste polyethylene plastic waste, and mixing incineration ash of 5 to 30% by weight, and mixing, crushing and melting at least once by twin screw extruders 10a, 10b and 10c. Method for producing a high-strength waste polyethylene plastic molded article reinforced by incineration. According to claim 3, after the step of melting the incineration ash mixed waste polyethylene plastics into a mold in a molten molding step, a extrusion process by extrusion after screwing and cooling to a desired shape and a press-processing compression An incineration circuit reinforced high strength waste polyethylene plastic molded article characterized in that it comprises any one of the processing steps.