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KR-102960710-B1 - Method for Manufacturing Recycling Plastic Composite, and Recycling Plastic Composite Manufactured thereby

KR102960710B1KR 102960710 B1KR102960710 B1KR 102960710B1KR-102960710-B1

Abstract

The present invention relates to a method for manufacturing recycled plastic and recycled plastic manufactured thereby. More specifically, the method for manufacturing recycled plastic comprises the steps of: adding and mixing materials including recycled plastic, silica, and an initiator; heating the materials in an extruder to produce a compound; cooling the compound; producing pellets from the cooled compound; and producing specimens from the pellets.

Inventors

  • 배재영
  • 이종탁

Assignees

  • 계명대학교 산학협력단

Dates

Publication Date
20260507
Application Date
20230227

Claims (14)

  1. A step of adding and mixing a material comprising recycled polyethylene plastic in the form of pellets of 5 mm or less, additives, and a peroxide initiator; A step of manufacturing a compound by heating the above material in an extruder; A step of cooling the above compound using a chiller cooler while maintaining a temperature of 25±5℃ ; A step of producing round and cylindrical pellets of 5 mm or less from the cooled compound in a pelletizer; and The above pellet includes the step of preparing a specimen according to ASTM standards, The above additive is, A method for manufacturing recycled plastic characterized by nanoparticles such as nanoclay, CaCO3 , CNT, SiO2 , mica, and graphene, and porous silica having a specific surface area of 1000 m2/g to 1200 m2/g.
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  4. In claim 1, The step of manufacturing the above compound is, A method for manufacturing recycled plastic characterized by heating at a temperature of 150~160℃.
  5. In claim 1, A method for manufacturing recycled plastic characterized by mixing the above-mentioned recycled plastic : initiator : silica in a ratio of 100 : 0.1~1.0 : 5~20.
  6. In claim 5, The above initiator is, It comprises at least one of DCP (Dicummyl peroxide), PBP (perbutyle peroxide), benzoyl peroxide (BPO), and 2,4-dichlorobenzoyl peroxide, wherein A method for manufacturing recycled plastic characterized by using a peroxide with a half-life of 200 degrees or less.
  7. In claim 1, The above silica is, (a) A step of adding 40 ml of water glass (sodium silicate solution) as a silica precursor to 700 ml of distilled water and stirring; (b) a step of adding 17 to 23 ml of cetyltrimeThyl ammonium chloride (CTACl), a surfactant, to the water glass solution formed in step (a) above and stirring for 30 minutes; (c) a step of adding hydrochloric acid and stirring so that the pH concentration of the CTACl added solution formed in step (b) above is adjusted to between 9 and 10; and (d) The silica obtained by filtering after stirring at room temperature for a predetermined time is prepared by including a step of synthesizing porous silica by washing with a washing solution mixed with distilled water and ethanol after filtration. The above step (d) is, A step of redispersing the above silica in an HCl/ethanol solution with a concentration of 0.8~1.2M to remove surfactants and stirring for 24 hours; A step of washing the above silica, after stirring is finished, by filtering it again in a washing solution mixed with distilled water and ethanol in a 50:50 ratio; and A step of drying the above-mentioned silica, after washing is complete, in an oven set to a temperature of 50℃; A method for manufacturing recycled plastic characterized by further including
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  10. In a recycled plastic manufactured by any one of the methods for manufacturing recycled plastics of claims 1, 4, 5, 6 and 7, The above recycled plastic is, Tensile strength is 80~90 kg/cm2, Growth rate is 7000~9000 % , Flexural strength is 100~120kg/cm2, Recycled plastic characterized by a flexural modulus of 8000 to 9000 kg/cm2.
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Description

Method for Manufacturing Recycling Plastic Composite, and Recycling Plastic Composite Manufactured thereby The present invention relates to a method for manufacturing recycled plastic and recycled plastic using the same, and more specifically, to a method for manufacturing recycled plastic with improved physical properties using porous silica and to a technology regarding recycled plastic manufactured thereby. Generally, recycled plastic is a type of plastic formed by the reprocessing of waste plastic and is produced to reduce plastic waste that pollutes the environment. Recycled plastic is produced based on resins such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), vinyl chloride (PVC), and polystyrene (PS). It has many applications, including clothing, carpets, bottles, plastic wood, pipes, floor tiles, compost bins, and egg cartons, and is widely utilized as a core component in end-use industries such as packaging, textiles, architecture and construction, automotive, and electrical and electronics. Recently, due to environmental issues, the development of recycling technologies for waste plastics is underway. Research aimed at improving the physical properties of these recycled plastics involves the active introduction of various inorganic additives, with diverse nanoparticles such as nanoclay, CaCO3, CNT, SiO2, mica, and graphene being primarily used. Among these nanomaterials, nanosilica is the most cost-effective option. Currently, commercially available silica is mainly classified into fumed silica and wet silica, but their specific surface area is limited to a maximum of 400 m²/g, which poses a significant limitation to their use. If the specific surface area is increased, the amount of silica contained in recycled plastic can be reduced, and improvements in the physical properties of the plastic are expected. Silica, a nano-filler, is widely used in industry as a filler that enhances polymer properties, so it is considered suitable for this development in terms of cost and performance. However, commercially available products have a specific surface area of about 400 m²/g, so improvement in this area is necessary. Therefore, this invention aims to improve the properties of recycled plastics by utilizing nano-silica with a specific surface area of 1000 m²/g or more. FIG. 1 is a process flow diagram for manufacturing recycled plastic according to one embodiment of the present invention. FIG. 2 is a flowchart of a method for manufacturing recycled plastic according to an embodiment of the present invention. Figures 3 and 4 are photographs of specimens manufactured according to one embodiment of the present invention. FIG. 5 is a manufacturing process diagram of porous silica according to one embodiment of the present invention. The present invention will be described below with reference to the attached drawings. However, the present invention may be implemented in various different forms and is therefore not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals. Throughout the specification, when it is stated that a part is "connected (connected, in contact, combined)" with another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components. The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Embodiments of the present invention will be described in detail below with reference to the attached drawings. FIG. 1 is a process diagram for manufacturing recycled plastic according to one embodiment of the present invention, and FIG. 2 is a flowchart for a method for manufacturing recycled plastic according to one embodiment of the present invention. Referring to FIGS. 1 and 2, the manufacture of recycled plastic according to one embodiment of the present invention comprises the steps of: adding and mixing materials including recycled plastic, silica, and an initiator (S110); heating the materials in an e