KR20220097567A - Manufacturing method of recycled PET pellets using waste PET bottles - Google Patents
Manufacturing method of recycled PET pellets using waste PET bottles Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/10—Making granules by moulding the material, i.e. treating it in the molten state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/10—Extrusion moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/80—Solid-state polycondensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
- B29B2017/0015—Washing, rinsing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0203—Separating plastics from plastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B2017/0424—Specific disintegrating techniques; devices therefor
- B29B2017/0468—Crushing, i.e. disintegrating into small particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
Description
본 발명은 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법에 관한 것이며, 보다 구체적으로는 폐PET병을 활용하여 높은 고유점도를 갖는 리싸이클 PET 펠릿의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing recycled PET pellets using a waste PET bottle, and more particularly, to a method for manufacturing recycled PET pellets having a high intrinsic viscosity using a waste PET bottle.
폴리에틸렌테레프탈레이트(polyethylene terephthalate; PET)는 물리적·화학적 특성이 우수하여 섬유, 필름, 타이어코드, 음료 용기 등의 다양한 용도에 사용되고 있으며 특히, 탄산음료, 생수, 과즙음료 등의 음료시장의 성장과 더불어 유리 용기 및 유해성 플라스틱 용기의 대체물인 병(bottle)용으로 그 수요가 꾸준히 증가하고 있으므로 이러한 PET병은 사용 후 다른 용도로 사용되지 않는 한 생활폐기물로서 취급되며, 적절하게 처리되지 않는 경우 공해물질로 남게된다.Polyethylene terephthalate (PET) has excellent physical and chemical properties and is used in various applications such as fibers, films, tire cords, and beverage containers. Since the demand for bottles, which is a substitute for glass containers and hazardous plastic containers, is steadily increasing, these PET bottles are treated as household waste unless they are used for other purposes after use. will be left
폐PET의 재활용 방법으로는 기계적 재활용, 화학적 재활용, 및 소각에 의한 에너지 회수 등의 재활용 방법이 있으나, 폐PET의 분쇄 및 연삭을 통해 크기를 줄이고 열에 의한 압출성형 및 개질하는 기계적 재활용 방법과 폐PET를 해중합하여 단량체 또는 올리고머 단위로 제조하여 PET 제품을 생산하는 화학적 재활용방법이 주로 이용되고 있다.As recycling methods for waste PET, there are recycling methods such as mechanical recycling, chemical recycling, and energy recovery by incineration. Chemical recycling is mainly used to produce PET products by depolymerizing them into monomer or oligomer units.
근래 들어 음료용 병 등과 같은 용기의 소재로 PET 사용량은 매우 급격히 증가되고 있고, 이로 인한 환경문제에 대한 관심도가 높아지면서 사용된 폐PET 용기를 재사용하는 방법이 다양하게 개발되고 있으며, 그 중 가장 주목 받고 있는 방법중 하나로 폐PET 용기를 스크랩(Scrap)형태의 플레이크(flake)로 잘게 절단하여 고상중합하고 다시 압출 후 펠릿으로 만들어 재사용하는 방법을 알려져 있다.In recent years, the use of PET as a material for containers such as beverage bottles is increasing very rapidly, and as interest in environmental problems increases, various methods of reusing used PET containers are being developed. As one of the accepted methods, it is known that the waste PET container is cut into scrap-type flakes, solid-state polymerization, extruded again, and reused as pellets.
폐PET의 재활용 방법과 관련한 선행기술로 예를 들면, 특허문헌1에 페트병을 색상별로 선별 분리하고 일정 크기로 분쇄하여 PET칩이 형성되는 분쇄단계와, 상기 분쇄단계에서 분쇄된 PET칩을 냉수와 온수를 이용하여 이물질 및 라벨용 본드, 약품을 제거하는 세척단계와, 세척단계에서 세척된 PET칩에 잔류하는 습기 및 이물질을 제거하는 건조단계와, 선별단계, 분쇄단계, 세척단계, 건조단계에서 발생되는 오염물질을 포집제거하는 집진부로 이루어진 페트병 재생방법을 개시하고 있으며, 특허문헌 2에는 폐 PET 용기를 절단 및/또는 분쇄하여 얻은 플레이크를 고상중합하는 방법에 있어서, 상기 플레이크를 고상 중합반응기내에 크기별로 적재한 후에 플레이크의 크기 별로 각기 다른 반응온도를 적용하되 플레이크의 크기가 작을수록 반응온도를 낮게 하는 것을 특징으로 하는 폐 폴리에스테르 플레이크의 고상중합방법을 개시하고 있다.As a prior art related to the recycling method of waste PET, for example, in Patent Document 1, a crushing step in which PET chips are formed by sorting and separating PET bottles by color and pulverizing them to a certain size; In the washing step to remove foreign substances, label bonds, and chemicals using hot water, the drying step to remove moisture and foreign substances remaining on the PET chip washed in the washing step, the sorting step, the crushing step, the washing step, and the drying step Disclosed is a PET bottle regeneration method comprising a dust collecting unit for collecting and removing generated contaminants, and Patent Document 2 discloses a method for solid-state polymerization of flakes obtained by cutting and/or pulverizing waste PET containers, wherein the flakes are placed in a solid-state polymerization reactor. Disclosed is a solid-state polymerization method of waste polyester flakes, characterized in that, after loading by size, different reaction temperatures are applied to each size of flakes, but the reaction temperature is lowered as the size of the flakes is smaller.
또 특허문헌 3에 폐폴리에스테르 제품을 분쇄하여 플레이크(flake)를 제조하는 공정; 잔류 수분율이 0.1 중량% 이하가 되도록 상기 플레이크를 건조하는 공정; 및 상기 건조된 플레이크를 녹여 재생 폴리에스테르 용융액을 제조하는 공정을 포함하되, 상기 플레이크를 건조하는 공정은 60 내지 200 ℃의 온도 및 1 내지 24 시간 동안 수행되는 재생 폴리에스테르 중합체의 제조방법을 개시하고 있다.In addition, in Patent Document 3, a process of pulverizing a waste polyester product to produce flakes; drying the flakes so that the residual moisture content is 0.1% by weight or less; and a process of preparing a regenerated polyester melt by melting the dried flakes, wherein the drying of the flakes discloses a method for producing a recycled polyester polymer performed at a temperature of 60 to 200° C. and for 1 to 24 hours, and have.
본 출원의 발명자는 기존의 폐PET 플레이크(flake)를 이용하여 기존의 고상중합에 의한 재생기술에 비하여 높은 제습과정을 통하여 고유점도가 높은 리싸이클 PET 펠릿의 제조방법을 개발하고 본 발명을 완성하였다.The inventor of the present application developed a method for manufacturing recycled PET pellets with high intrinsic viscosity through a high dehumidification process compared to the existing regeneration technology by solid-state polymerization using existing waste PET flakes and completed the present invention.
본 발명에서 해결하려는 과제는 폐PET(polyethylene terephthalate; PET)병의 플레이크를 이용하여 리싸이클 PET 펠릿을 제조하는 방법의 제공에 관한 것이며, 보다 상세하게는 폐PET병를 분쇄한 폐PET병 플레이크를 이용하여 재생과정에서 수분에 의한 가수분해를 억제하고, 고상중합에 의해 높은 고유점도의 리싸이클 PET 필릿을 제조하는 방법을 제공하는 것을 목적으로 하는 것이다.The problem to be solved in the present invention relates to the provision of a method for manufacturing recycled PET pellets using the flakes of waste PET (polyethylene terephthalate; PET) bottles, and more particularly, using the waste PET bottle flakes pulverized by waste PET bottles. An object of the present invention is to provide a method for inhibiting hydrolysis due to moisture in the regeneration process and manufacturing a recycled PET fillet having high intrinsic viscosity by solid-state polymerization.
본 발명에 따른 과제의 해결수단으로 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법은 수집된 폐PET병으로부터 투명 폐PET병만의 선별 및 플레이형태로 분쇄하고, 결정화 및 건조한 다음 고상중합 및 고상중합물을 펠릿 형태로 성형하여 리싸이클 PET 펠릿을 제조하는 공정을 포함하는 것으로 이루어진다.As a means of solving the problem according to the present invention, the manufacturing method of recycled PET pellets using waste PET bottles is selected from the collected waste PET bottles and pulverized in a play form only for transparent waste PET bottles, crystallized and dried, then solid-state polymerization and solid-state polymerization It consists of including a process of manufacturing a recycled PET pellets by molding in the form of a pellet.
본 발명에 따른 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법의 일 실시 형태는 a). 수집된 폐PET병으로부터 투명 폐PET병만을 선별하고 여러 형태의 오염물질을 제거한 다음 압착하는 정선공정, b). 정선된 폐PET병을 폐PET 플레이크 형태로 분쇄하 다음, 투명 PET 플레이크만을 선별한 선별공정, c). 선별된 투명 PET 플레이크를 일정온도에서 일정시간 결정화하는 결정화공정, d). 결정화된 PET 플레이크를 일정온도로 가열하면서 압출하여 폐PET 칩으로 성형한 후 상온으로 냉각 및 건조하는 수분제거공정 및 e), 폐PET 칩에 가수분해 억제제를 배합하고, 불활성 분위기에서 일정온도 하에 고상중합시키는 고상중합공정 및 f). 고상중합물을 용융온도 조건에서 압출하여 펠릿으로 성형하는 리싸이클 PET 펠릿 제조공정을 포함하는 것으로 이루어진다.One embodiment of a method for manufacturing recycled PET pellets using a waste PET bottle according to the present invention is a). Selection process in which only transparent waste PET bottles are selected from the collected waste PET bottles, various types of contaminants are removed, and then pressed; b). A screening process in which the selected waste PET bottles are pulverized into waste PET flakes, and then only transparent PET flakes are selected, c). A crystallization process in which the selected transparent PET flakes are crystallized at a certain temperature for a certain time, d). A water removal process of extruding crystallized PET flakes while heating them to a certain temperature, molding them into waste PET chips, and cooling and drying them to room temperature. solid-state polymerization process for polymerization and f). It consists of including a recycling PET pellet manufacturing process in which the solid-state polymer is extruded under melting temperature conditions and molded into pellets.
본 발명에 따른 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법의 또 다른 실시 형태는 a). 수집된 폐PET병으로부터 투명 폐PET병만을 선별하고 여러 형태의 오염물질을 제거한 다음 압착하는 정선공정, b). 정선된 폐PET병을 3 ~ 5㎜ 크기의 폐PET 플레이크 형태로 분쇄하 다음, 투명 PET 플레이크만을 선별한 선별공정, c). 선별된 투명 PET 플레이크를 140 ~ 165℃에서 일정시간 결정화하는 결정화공정, d). 결정화된 PET 플레이크를 용융온도 조건에서 압출하여 0.5 ~ 1㎜ 크기의 폐PET 칩으로 성형한 후 상온으로 냉각 및 건조하는 수분제거공정, 및 e). 폐PET 칩에 가수분해 억제제를 배합하고, 진공하에서 질소가스를 충진하고 180 ~ 220℃ 하에 고상중합시키는 고상중합공정, 및 f). 고상중합물을 용융온도 조건에서 압출하여 펠릿으로 성형하는 리싸이클 PET 펠릿 제조공정을 포함하는 것으로 이루어진다.Another embodiment of a method for manufacturing recycled PET pellets using a waste PET bottle according to the present invention is a). Selection process in which only transparent waste PET bottles are selected from the collected waste PET bottles, various types of contaminants are removed, and then pressed; b). A screening process in which the selected waste PET bottles are pulverized into waste PET flakes with a size of 3 to 5 mm, and then only transparent PET flakes are selected, c). Crystallization process in which the selected transparent PET flakes are crystallized at 140 ~ 165℃ for a certain period of time, d). A water removal process in which crystallized PET flakes are extruded under melting temperature conditions, molded into waste PET chips having a size of 0.5 to 1 mm, and then cooled and dried to room temperature, and e). A solid-state polymerization process in which a hydrolysis inhibitor is blended into the waste PET chip, filled with nitrogen gas under vacuum, and solid-state polymerization is carried out at 180 to 220° C., and f). It consists of including a recycling PET pellet manufacturing process in which the solid-state polymer is extruded under melting temperature conditions and molded into pellets.
본 발명에 따른 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법은 폐PET병의 재생과정에서 수분에 의한 가수분해를 억제하고, 고상중합에 의해 높은 0.72 ~ 0.8dl/g의 고유점도(IV)를 갖는 리싸이클 PET 펠릿을 제조하는 것으로 이루어진다.The manufacturing method of recycled PET pellets using waste PET bottles according to the present invention suppresses hydrolysis due to moisture in the regeneration process of waste PET bottles, and has a high intrinsic viscosity (IV) of 0.72 to 0.8 dl/g by solid-state polymerization It consists in producing a recycling PET pellets having.
본 발명에 따른 리싸이클 PET 펠릿 제조방법은 반복되는 제습과정 및 수분에 의한 가수분해을 억제하면서 고상중합에 의해 높은 고유점도(IV)를 갖는 PET 펠릿을 제조하는 효과가 있으며 또 본 발명의 보다 높은 고유점도(IV)를 갖는 리싸이클 PET 펠릿은 보다 고품질의 PET 성형제품을 생산할 수 있어 상업적으로 매우 유리한 장점을 지니고 있다.The recycling PET pellet manufacturing method according to the present invention has the effect of producing PET pellets having high intrinsic viscosity (IV) by solid-state polymerization while suppressing the repeated dehumidification process and hydrolysis by moisture, and the higher intrinsic viscosity of the present invention Recycled PET pellets with (IV) have a commercially very advantageous advantage because they can produce higher quality PET molded products.
이하에서는 본 발명을 실시하기 위하여 보다 구체적으로 설명하지만 아래 기재 내용에 의해 본 발명이 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail in order to carry out the present invention, but the present invention is not limited by the contents described below.
본 발명에 따른 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법은 a). 수집된 폐PET병으로부터 투명 폐PET병만을 선별하고 여러 형태의 오염물질을 제거한 다음 압착하는 정선공정, b). 정선된 폐PET병을 3 ~ 5㎜ 크기의 폐PET 플레이크 형태로 분쇄하 다음, 투명 PET 플레이크만을 선별한 선별공정, c). 선별된 투명 PET 플레이크를 140 ~ 165℃에서 일정시간 결정화하는 결정화공정, d). 결정화된 PET 플레이크를 용융온도 조건에서 압출하여 0.5 ~ 1㎜ 크기의 폐PET 칩으로 성형한 후 상온으로 냉각 및 건조하는 수분제거공정, e). 폐PET 칩에 가수분해 억제제를 배합하고, 진공하에서 질소가스를 충진하고 180 ~ 220℃ 하에 고상중합시키는 고상중합공정 및 f). 고상중합물을 용융온도 조건에서 압출하여 펠릿으로 성형하는 리싸이클 PET 펠릿 제조공정을 포함하는 것으로 이루어진다.The method for manufacturing recycled PET pellets using waste PET bottles according to the present invention is a). Selection process in which only transparent waste PET bottles are selected from the collected waste PET bottles, various types of contaminants are removed, and then pressed; b). A screening process in which the selected waste PET bottles are pulverized into waste PET flakes with a size of 3 to 5 mm, and then only transparent PET flakes are selected, c). Crystallization process in which the selected transparent PET flakes are crystallized at 140 ~ 165℃ for a certain period of time, d). A water removal process in which crystallized PET flakes are extruded under melting temperature conditions, molded into waste PET chips with a size of 0.5 to 1 mm, and then cooled and dried to room temperature, e). A solid-state polymerization process in which a hydrolysis inhibitor is blended into the waste PET chip, filled with nitrogen gas under vacuum, and solid-state polymerization is performed at 180 to 220° C. and f). It consists of including a recycling PET pellet manufacturing process in which the solid-state polymer is extruded under melting temperature conditions and molded into pellets.
본 발명에 따른 상기 a). 정선공정은 PET 폐기물로부터 분리수거한 폐PET병으로부터 투명 폐PET병을 선별하고 오염물질, 라벨 등을 제거하여 정선된 투명 폐PET병만을 분리한 후 분쇄효율을 높이기 위하여 압착하는 공정으로 이루어진다.Said a) according to the invention. The selection process consists of sorting transparent waste PET bottles from waste PET bottles separated and collected from PET waste, removing contaminants, labels, etc.
폐PET병에 부착된 오염물질, 라벨 등은 최종 리싸이틀 PET 펠릿의 품질에 영향을 주기 때문에 정밀한 정선작업이 요구되며, 폐PET병에 부착된 오염물질, 라벨 등을 완전히 게거하는 것이 바람직하다.Since contaminants and labels attached to waste PET bottles affect the quality of the final recital PET pellets, precise selection work is required, and it is desirable to completely remove contaminants and labels attached to waste PET bottles.
본 발명에 따른 상기 b). 선별공정은 압착된 폐PET병을 플레이크 형상으로 분쇄한 다음, 투명 PET 플레이크만을 선별하는 것으로 이루어지며, 압착된 폐PET병을 3 ~ 5㎜ 크기의 플레이크 형태로 분쇄는 것이 바람직하며, 폐PET 플레이크로부터 광학플레이크 선별기에 의해 육안으로 구분이 어려운 유색 폐PET 플에이크 등을 분리하고, 투명 폐PET 플레이크만을 선별하여 보다 높은 순도의 리싸이클 PET 펠릿을 제조하는 것으로 이루어진다.b) according to the invention. The sorting process consists of crushing the compressed waste PET bottle into flakes, and then sorting only the transparent PET flakes. It is preferable to grind the compressed waste PET bottle into flakes with a size of 3 to 5 mm, and waste PET flakes. It consists of separating colored waste PET flakes, etc., which are difficult to distinguish visually by an optical flake sorter, and selecting only transparent waste PET flakes to produce recycled PET pellets of higher purity.
본 발명에 따른 상기 c). 결정화공정은 선별된 투명 PET 플레이크를 140 ~ 165℃에서 일정시간 결정화하는 공정이며, 투명 PET 플레이크의 투입량 및 결정화온도에 따라 결정화 시간이 다를 수 있으나, 일반적으로 1 ~ 2시간 정도 결정화하는 것으로 이루어진다. c) according to the invention. The crystallization process is a process in which the selected transparent PET flakes are crystallized at 140 ~ 165 ° C. for a certain period of time, and the crystallization time may vary depending on the input amount of the transparent PET flakes and the crystallization temperature, but in general, crystallization is performed for about 1 to 2 hours.
일반적으로 PET는 결정화 온도 즉 140 ~ 165℃로 가열하면 분자사슬이 배열하면서 미이크로미터 수준의 단위체를 만들어 불투명하게 변하며, 내열도가 향상되는 특성을 나타낸다. In general, when PET is heated to a crystallization temperature, that is, 140 to 165° C., the molecular chains are aligned to form micrometer-level units, which turns opaque, and exhibits improved heat resistance.
본 발명에서는 결정화가 되지 않은 투명한 폐PET 플레이크를 그대로 후속하는 수분제거공정에서 칩으로 성형하는 경우 성형기 등에 융착하여 성형 칩의 분리가 용이하지 않는 등의 문제점이 발생하므로 후속하는 수분제거공정의 효율성을 높이기 위하여 결정화 공정을 채용하는 것으로 이루어진다.In the present invention, when transparent waste PET flakes that have not been crystallized are molded into chips in the subsequent water removal process as they are, there are problems such as not being easy to separate the molded chips due to fusion in the molding machine, etc., so the efficiency of the subsequent water removal process It consists in employing a crystallization process in order to increase it.
상기 결정화 공정은 본 발명이 속하는 기술분야에 널리 채용되고 있는 결정화 설비로 예를 들면, 가열이 가능한 용기를 화전시키면서 내용물을 유동시켜 결정화하는 로타리방식의 결정화 설비 내지 가열호퍼 내부에 장착된 고속교반기로 내용물을 유동시키면서 결정화 화는 설비 등을 채용하여 결정화 한다.The crystallization process is a crystallization facility widely employed in the technical field to which the present invention pertains. For example, a rotary type crystallization facility that crystallizes by flowing the contents while heating a container that can be heated or a high-speed stirrer mounted inside a heating hopper. Crystallization is carried out by employing equipment for crystallization while flowing the contents.
본 발명에 따른 상기 d). 수분제거공정은 결정화된 폐PET 플레이크를 용융온도로 가열하면서 압출하여 0.5 ~ 1㎜ 크기의 폐PET 칩으로 성형한 후 상온으로 냉각 및 건조하는 것으로 이루어지며, 상기 용융온도는 폐PET의 성상에 따라 다르수 있으므로 용융온도 270 ~ 280℃ 범위에서 적절히 가열하는 것이 바람직하다.d) according to the invention. The water removal process consists of extruding the crystallized waste PET flakes while heating them to a melting temperature, molding them into waste PET chips with a size of 0.5 to 1 mm, and cooling and drying them to room temperature, and the melting temperature depends on the properties of the waste PET. It may be different, so it is preferable to properly heat the melting temperature in the range of 270 ~ 280 ℃.
상기 수분제거공정은 상기한 결정화 공정과 함께 폐PET에 함유된 수분을 제거하는 공정이며, 결정화된 폐PET 플레이크를 PET의 용융온도로 가열하면서 압출하여 칩형태로 성형하고, 건조된 공기 등으로 상온까지 냉각하면서 건조하는 것으로 이루어진다.The water removal process is a process for removing moisture contained in waste PET together with the crystallization process, and extrudes the crystallized waste PET flakes while heating them to the melting temperature of PET to form a chip, and uses dried air at room temperature. It consists of drying while cooling to
본 발명에 따른 상기 e). 고상중합공정은 폐PET 칩에 가수분해 억제제를 배합하고, 1 torr의 진공상태에서 질소를 충진하고 180 ~ 220℃ 하에 고상중합시키는 것으로 이루어지며, 고상중합에 의해 낮은 고유점도의 폐PET부터 보다 높은 고유점도를 갖는 리싸이클 PET기 제조된다.e) according to the invention. The solid-state polymerization process consists of mixing a hydrolysis inhibitor in waste PET chips, filling nitrogen in a vacuum of 1 torr, and solid-state polymerization at 180 ~ 220 ° C. A recycled PET machine with intrinsic viscosity is manufactured.
상기 가수분해 억제제는 고상중합 과정에서 폐PET에 함유된 수분에 의해 가수분해에 PET의 중합도가 저하되는 것을 방지하기 위한 조성하며 또한 중합반응물을 고온에서 압출성형 할 때 폐PET에 함유된 수분에 의해 가수분해에 PET의 중합도가 저하되는 것을 방지하는 작용을 나타낸다.The hydrolysis inhibitor is a composition to prevent the polymerization degree of PET from being lowered due to hydrolysis by moisture contained in waste PET during solid-state polymerization. It shows the action of preventing the polymerization degree of PET from being lowered by hydrolysis.
상기 가수분해억제제는 본 발명이 속하는 기술분야에 널리 알려져 시판하고 있는 키르보디이미계 화합물이 조성되며 예를 들면, 비스(2,6-디이소프로필페닐)카르보디이미드가 조성되며, 상기 가수분해억제제는 폐PET 칩 100중량부에 대하여 0.2 ~ 0.5중량부로 조성하는 것이 바람직하다.The hydrolysis inhibitor is a commercially available kyrbodiimi compound widely known in the art to which the present invention belongs, for example, bis(2,6-diisopropylphenyl)carbodiimide is composed, and the hydrolysis The inhibitor is preferably formulated in an amount of 0.2 to 0.5 parts by weight based on 100 parts by weight of the waste PET chip.
본 발명에 따른 상기 f). 리싸이클 PET 펠릿 제조공정은 고상중합물을 용융온도 조건에서 압출하여 3 ~ 5㎜ 크기의 펠릿으로 성형하는 공정이며, 0.72 ~ 0.80dl/g 정도의 고유점도(IV)를 갖는 리싸이클 PET 칩이 제조된다.f) according to the invention. The recycling PET pellet manufacturing process is a process of extruding a solid polymer under melting temperature conditions and molding it into pellets with a size of 3 to 5 mm, and a recycled PET chip having an intrinsic viscosity (IV) of about 0.72 to 0.80 dl/g is manufactured.
상기 본 발명에서 폐PET의 압출성형 및 리싸이클 PET 펠릿 제조는 본 발명이 속하는 기술분야에 널리 알려져 압출기 및 펠릿타이저 수단을 채용하여 쉽게 제조할 수 있으며, 본 발명에 따른 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법에 의해 제조된 0.72 ~ 0.80dl/g 정도의 고유점도(IV)를 갖는 리싸이클 PET 펠릿은 일반적으로 PET폐기물로부터 수집된 투명 폐PET병의 고유점도(0.70dl/g 이하)에 비하여 높은 고유점도를 나타내므로 고품질의 재생PET 제품의 생산이 가능하다.In the present invention, extrusion molding of waste PET and manufacturing of recycled PET pellets are widely known in the art to which the present invention belongs, and can be easily manufactured by employing an extruder and pelletizer means, and recycling using waste PET bottles according to the present invention Recycled PET pellets having an intrinsic viscosity (IV) of about 0.72 to 0.80 dl/g produced by the method for manufacturing PET pellets generally have an intrinsic viscosity (0.70 dl/g or less) of transparent waste PET bottles collected from PET waste. Since it exhibits high intrinsic viscosity, it is possible to produce high-quality recycled PET products.
Claims (6)
b). 정선된 폐PET병을 3 ~ 5㎜ 크기의 폐PET 플레이크 형태로 분쇄하 다음, 투명 PET 플레이크만을 선별한 선별공정,
c). 선별된 투명 PET 플레이크를 140 ~ 165℃에서 일정시간 결정화하는 결정화공정,
d). 결정화된 PET 플레이크를 용융온도 조건에서 압출하여 0.5 ~ 1㎜ 크기의 폐PET 칩으로 성형한 후 상온으로 냉각 및 건조하는 수분제거공정,
e). 폐PET 칩에 가수분해 억제제를 배합하고, 진공하에서 질소가스를 충진하고 180 ~ 220℃ 하에 고상중합시키는 고상중합공정 및
f). 고상중합물을 용융온도 조건에서 압출하여 펠릿으로 성형하는 리싸이클 PET 펠릿 제조공정을 포함하는 것을 특징으로 하는 폐PET병을 활용한 리싸이클 PET 펠릿의 제조방법.a). Selection process of selecting only transparent waste PET bottles from the collected waste PET bottles, removing various types of contaminants, and then pressing;
b). A screening process in which the selected waste PET bottles are pulverized into waste PET flakes with a size of 3 to 5 mm, and then only transparent PET flakes are selected;
c). A crystallization process in which the selected transparent PET flakes are crystallized at 140 ~ 165℃ for a certain period of time,
d). A water removal process in which crystallized PET flakes are extruded under melting temperature conditions, molded into waste PET chips with a size of 0.5 to 1 mm, and then cooled and dried to room temperature;
e). A solid-state polymerization process in which a hydrolysis inhibitor is mixed with waste PET chips, filled with nitrogen gas under vacuum, and solid-state polymerization is carried out at 180 ~ 220 ℃, and
f). A method of manufacturing recycled PET pellets using waste PET bottles, characterized in that it includes a recycling PET pellet manufacturing process of extruding the solid polymer under melting temperature conditions to form pellets.
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| KR100880465B1 (en) | 2002-09-24 | 2009-01-28 | 에스케이케미칼주식회사 | Method for solid-state polymerization of waste polyester and apparatus therefor |
| KR100895529B1 (en) | 2008-08-08 | 2009-04-30 | 박용익 | A pet bottle revival method |
| KR101417193B1 (en) | 2010-09-30 | 2014-07-09 | 코오롱인더스트리 주식회사 | Recycled polyester polymer and Method for manufacturing the same, Spun bond nonwoven fabric using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100880465B1 (en) | 2002-09-24 | 2009-01-28 | 에스케이케미칼주식회사 | Method for solid-state polymerization of waste polyester and apparatus therefor |
| KR100895529B1 (en) | 2008-08-08 | 2009-04-30 | 박용익 | A pet bottle revival method |
| KR101417193B1 (en) | 2010-09-30 | 2014-07-09 | 코오롱인더스트리 주식회사 | Recycled polyester polymer and Method for manufacturing the same, Spun bond nonwoven fabric using the same |
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