WO2021086082A1 - 폴리에스테르 필름, 이의 제조 방법, 및 이를 이용한 폴리에틸렌테레프탈레이트 용기의 재생 방법 - Google Patents
폴리에스테르 필름, 이의 제조 방법, 및 이를 이용한 폴리에틸렌테레프탈레이트 용기의 재생 방법 Download PDFInfo
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- WO2021086082A1 WO2021086082A1 PCT/KR2020/014956 KR2020014956W WO2021086082A1 WO 2021086082 A1 WO2021086082 A1 WO 2021086082A1 KR 2020014956 W KR2020014956 W KR 2020014956W WO 2021086082 A1 WO2021086082 A1 WO 2021086082A1
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- polyester film
- temperature
- polyethylene terephthalate
- heat
- film
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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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
Definitions
- the embodiment relates to a polyester film, a method for manufacturing the same, and a method for regenerating a polyethylene terephthalate container using the same. Specifically, the embodiment relates to a polyester film having excellent recyclability by controlling crystallinity, a method for manufacturing the same, and a method for regenerating a polyethylene terephthalate (PET) container provided with such a polyester film.
- PET polyethylene terephthalate
- Heat-shrinkable labels and packaging materials utilize the property of a polymer film to shrink in a form before stretching again at a specific temperature or higher after stretching orientation.
- a heat-shrinkable film is cut and printed in a desired design, rolled up, bonded at both ends with an adhesive solvent, and then loosely covered in a container and heat is applied to shrink it.
- the film applied to the heat shrinking process is required not only to have basic properties such as heat resistance, chemical resistance, weather resistance, and printability, but also container sealing property, heat shrink uniformity, running characteristics in the longitudinal direction, and crack resistance.
- Polyvinyl chloride film, polystyrene film, polypropylene film, etc. have been conventionally used for this heat shrinking process, and recently, polyester films having properties such as high heat resistance, weather resistance, ease of incineration, and excellent printability have been widely used. .
- Korean Laid-Open Patent Publication No. 2002-0062838 is formulated to contain 5% by weight or more of polyester elastomer in a heat-shrinkable polyester film to suppress the occurrence of wrinkles, shrinkage stains, distortions, etc. due to heat shrinkage during full packaging of plastic bottles. It is starting.
- polyester films used in the heat shrinking process are manufactured with lower crystallinity by blending a soft component in a polyester resin, and thermal properties such as shrinkage rate and shrinkage stress by temperature, and chemical resistance suitable for the seaming process, And it is being developed to have recyclability, which has recently emerged as a waste plastic problem.
- thermoplastic polymers In addition, as concerns about environmental issues have recently increased, there is a demand for a response response to the recycling problem of products manufactured using thermoplastic polymers.
- PET polyethylene terephthalate
- thermoplastic resin with excellent properties such as heat resistance, processability, transparency, and non-toxicity, is widely used to manufacture a wide range of products such as films, fibers, bottles, containers, etc., so research to improve the regeneration rate Is going on.
- Patent Document 1 Korean Patent Application Publication No. 2002-0062838
- the embodiment is a polyester film in which crystallinity is controlled, shrinkage characteristics are excellent, and recyclability is excellent, and clamping which is irregularly agglomerated even during high-temperature drying for a long time in the regeneration process rarely occurs, a method of manufacturing the same, And it is intended to provide a method for regenerating a polyethylene terephthalate container using the same.
- the polyester film according to an embodiment is a polyester film comprising a copolymerized polyester resin in which diol and dicarboxylic acid are copolymerized, and the crystallization temperature (Tc) measured by Differential Scanning Calorimetry is not measured, or When the flakes obtained by grinding the polyethylene terephthalate (PET) container provided with the polyester film are heat-treated for 90 minutes at a temperature of 210° C., the clumping ratio is 10% or less.
- a method for producing a polyester film includes the steps of preparing a copolymerized polyester resin in which a diol and a dicarboxylic acid are copolymerized; Melt-extruding the copolymerized polyester resin at a temperature of 250°C to 300°C to prepare an unstretched sheet; And a step of preparing a polyester film by stretching the unstretched sheet at a temperature of 70° C. to 100° C. and then heat setting at a temperature of 65° C. to 90° C., wherein the polyester film is subjected to a differential scanning calorimeter.
- the crystallization temperature (Tc) measured by calorimetry) is not measured, or the flakes of the polyethylene terephthalate (PET) container equipped with the polyester film are heat treated for 90 minutes at a temperature of 210°C. If so, the clumping ratio is 10% or less.
- a method for regenerating a polyethylene terephthalate container includes: preparing a polyethylene terephthalate (PET) container provided with the polyester film; Pulverizing the polyethylene terephthalate (PET) container provided with the film to obtain flakes; And heat-treating the flakes to prepare a recycled polyester chip, wherein when the flakes are heat-treated at a temperature of 210° C. for 90 minutes, a clumping ratio is 10% or less, and the flakes are the polyethylene terephthalate.
- PET A first flake obtained by pulverizing a container and a second flake obtained by pulverizing the polyester film are included.
- the crystallization temperature (Tc) measured by a differential scanning calorimeter is not measured or satisfies 70°C to 130°C, so that crystallinity can be easily controlled. Therefore, the occurrence of clumping is suppressed even during long-term high-temperature drying during the regeneration process, and thus can be applied to the regeneration process.
- the clumping fraction is very low, it is possible to improve recyclability while preventing environmental pollution, thus improving the quality, yield, and productivity of recycled polyester chips manufactured through the recycling method of the polyethylene terephthalate container using the polyester film. I can make it.
- the method of regenerating a polyethylene terephthalate container according to an embodiment does not require a separate process for separating the container from the film, and thus time and cost are saved, which is economical.
- Figure 5 shows a method of measuring the shrinkage stress of the polyester film.
- Heat-shrinkable labels or packaging made of polyester film are difficult to recycle even though they have excellent thermal properties and chemical resistance, and most of them have been discarded after use. This is because, when a polyester film is introduced into the current recycling process, that is, the recycling process, the polyester film causes various process defects during a high-temperature process for a long time, resulting in an increase in cost. Alternatively, even if recycling is possible, there is a problem in that seaming characteristics are poor when applying the variable sleeve offset printing (VSOP) method due to the high crystallinity of the polyester film.
- VSOP variable sleeve offset printing
- the polyethylene terephthalate (PET) container recovered from the general consumer is pelletized after liquid specific gravity separation, dehydration drying and/or wind specific gravity separation in order to remove a large amount of film contained in the pulverized product after washing and pulverization.
- PET polyethylene terephthalate
- the recycled polyester chips may be colored due to the ink contained in the film.
- due to the thermal characteristics of the film there is a problem in that clumping occurs in which the recycled polyester chips are irregularly agglomerated in the regeneration process, especially in the heat treatment process.
- the polyester film according to the embodiment has excellent shrinkage properties and seaming properties in various printing methods as well as excellent recyclability because crystallinity is controlled, and clumping hardly occurs even during long-time high-temperature drying in the regeneration process. Accordingly, it is possible to improve the quality, yield, and productivity of the recycled polyester chips manufactured through the recycling method of the polyester film or a polyethylene terephthalate (PET) container using the same.
- PET polyethylene terephthalate
- the polyester film according to an embodiment is a polyester film comprising a copolymerized polyester resin in which diol and dicarboxylic acid are copolymerized, and the crystallization temperature (Tc) measured by Differential Scanning Calorimetry is not measured, or When the flakes obtained by grinding the polyethylene terephthalate (PET) container provided with the polyester film are heat-treated for 90 minutes at a temperature of 210° C., the clumping ratio is 10% or less.
- the crystallization temperature (Tc) measured by differential scanning calorimetry of the polyester film according to the embodiment is not measured or is 70°C to 130°C.
- the crystallization temperature (Tc) measured by the differential scanning calorimeter of the film is not measured, or 80°C to 130°C, 85°C to 125°C, 90°C to 123°C, 96°C to 120°C, 98°C to It may be 120 °C or 99.5 °C to 118 °C.
- the polyester film has a very low clumping fraction during the regeneration process of the film or the polyethylene terephthalate (PET) container including the film because the crystallinity of the polyester film is effectively controlled to prevent environmental pollution. Recyclability can be improved.
- PET polyethylene terephthalate
- the differential scanning calorimeter may be specifically a modulated differential scanning calorimeter (modulated DSC, MDSC), and more specifically, a temperature-modulated differential scanning calorimeter (TMDSC).
- modulated DSC modulated differential scanning calorimeter
- MDSC modulated differential scanning calorimeter
- TMDSC temperature-modulated differential scanning calorimeter
- the crystallization temperature may be measured by scanning at a heating rate of 10° C./min using a differential scanning calorimeter (DSC) mode.
- the first endothermic temperature is the glass transition temperature (Tg, Glass Transition Temperature)
- the exothermic temperature measured after Tg is the crystallization temperature (Tc, CrystallizationTemperature)
- Tm melting point
- the calorific value of crystallization was calculated as an integral value at Tc, and the higher the calorific value of crystallization, the faster the crystallization rate and the higher the transition rate to the crystal phase.
- the clumping fraction may be 10% or less.
- the clumping fraction may be 8% or less, 6% or less, 5% or less, 4% or less, preferably 3% or less, 2% or less, 1.5% or less, 1% or less, 0.8% or less, It may be less than 0.5%.
- the clumping refers to an agglomerate that may be formed during a regeneration process, and the size of the agglomerate may be, for example, 3 times or more of the size of the flake particle before the heat treatment.
- the clumping fraction means a weight ratio of the aggregate based on the total weight of the flakes before the heat treatment.
- flakes obtained by crushing the flakes are passed through a sieve and then subjected to a heat treatment process.
- the flakes can form agglomerates by sticking to each other, and such agglomerates are referred to as clumping.
- the formed agglomerates are again filtered through a sieve, and the weight is measured, and the weight ratio of the agglomerates is calculated based on the total weight of the flakes before the heat treatment, thereby obtaining a clumping fraction. Therefore, the higher the value of the clumping fraction, the lower the recyclability.
- polyester film according to the embodiment is effectively controlled in crystallinity, wrinkles or crushing of the polyethylene terephthalate container do not occur when applied as a label for a polyethylene terephthalate (PET) container.
- PET polyethylene terephthalate
- the clumping fraction is very low, so recyclability can be improved, as well as the quality and yield of recycled polyester chips manufactured by recycling. And productivity can be improved.
- the American Association of Plastic Recycling Companies has established a procedure (APR PET-S-08) to evaluate the clumping fraction (%). I'm doing it.
- the clumping fraction is obtained by pulverizing 3 parts by weight of the polyester film and 97 parts by weight of a polyethylene terephthalate container to a particle diameter of 9.5 mm or less, respectively, and a pressure of 8.7 kPa (with respect to a cylinder having a diameter of 6 cm) at a temperature of 210°C. After heat treatment for 90 minutes under an applied load of 2.5 kgf), there may be a ratio that does not pass through a sieve with a hole size of 11.2 mm (0.625" sieve).
- the polyester film may have a melting point (Tm) of 170° C. or higher as measured with a differential scanning calorimeter.
- Tm melting point
- the melting point may be 175°C or higher, 180°C or higher, or 190°C or higher, and 170°C to 240°C, 175°C to 235°C, 180°C to 235°C, 185°C to 230°C, 190°C to 225 It may be °C or 195 °C to 225 °C.
- the melting point of the polyester film exceeds the above range, the adhesive strength of the polyester film by the solvent decreases, and thus it may be difficult to use in the seaming process, and when the melting temperature is less than the above range, the clumping fraction may increase. .
- the crystallization temperature of the polyester film is 96°C to 120°C and the melting point is 170°C or higher, more preferably, when the crystallization temperature of the polyester film is 96°C to 120°C and the melting point is 190°C or higher, It is possible to maximize the effect of preventing the clumping phenomenon that may occur in the regeneration process.
- the amount of heat of crystallization of the film measured at the crystallization temperature (Tc) may be 0.01 J/g to 50 J/g.
- the heat of crystallization of the film measured at the crystallization temperature (Tc) is 0.01 J/g to 40 J/g, 0.05 J/g to 30 J/g, 0.1 J/g to 20 J/g, 0.1 J/g to 10 J/g, 0.1 J/g to 8 J/g, 0.2 J/g to 6 J/g, or 0.3 J/g to 5.7 J/g.
- the polyester film has a very low clumping fraction during the regeneration process of the film or the polyethylene terephthalate (PET) container including the film because its crystallinity is effectively controlled to prevent environmental pollution. Recyclability can be improved.
- PET polyethylene terephthalate
- the shrinkage rate in the main contraction direction for each temperature may be adjusted within a specific range.
- the range of T 70 , T 80 , T 90 and T 100 may be adjusted when the shrinkage rate in the main contraction direction is defined as T X.
- the heat treatment for obtaining the T X may specifically be immersing the polyester film in hot water at X° C. for 10 seconds.
- the thermal contraction rate (T 70 ) in the first direction may be 0% to 50%.
- T 70 may be 0% or more, 5% or more, 10% or more, 15% or more, or 20% or more, and 50% or less, 40% or less, 35% or less, 30% or less, 25% or less, or 20 May be less than or equal to %.
- the first direction may be a transverse direction (TD) or a longitudinal direction (MD), and the second direction perpendicular to the first direction may be a longitudinal direction (MD) or a transverse direction (TD).
- the first direction may be a main contraction direction. More specifically, the first direction may be a transverse direction TD as a main contraction direction, and the second direction may be a longitudinal direction MD.
- the thermal contraction rate (T 80 ) in the first direction may be 30% or more.
- T 80 may be 35% or more, 45% or more, 50% or more, or 55% or more, and 30% to 85%, 40% to 80%, 50% to 80%, 55% to 75% or 58 % To 71%.
- the thermal contraction rate in the first direction satisfies the above range, so that the film is easy to label during a process surrounding at least a part of the container.
- the film is applied as a label for a polyethylene terephthalate (PET) container, wrinkles or crushing of the polyethylene terephthalate container do not occur.
- PET polyethylene terephthalate
- the thermal contraction rate (T 90 ) in the first direction may be 50% or more.
- T 90 may be 55% or more, 60% or more, or 65% or more, and may be 50% to 90%, 60% to 85%, 65% to 83%, or 69% to 80%.
- the thermal contraction rate in the first direction satisfies the above range, so that the film is easy to label during a process surrounding at least a part of the container.
- the film is applied as a label for a polyethylene terephthalate (PET) container, wrinkles or crushing of the polyethylene terephthalate container do not occur.
- PET polyethylene terephthalate
- the thermal contraction rate (T 100 ) in the first direction may be 40% to 90%.
- T 100 may be 40% or more, 50% or more, 60% or more, or 70% or more, and may be 90% or less, 85% or less, 80% or less, 75% or less, or 70% or less. That is, the polyester film may have a heat contraction rate of 50% to 80% in the first direction when heat-treated at a temperature of 100° C. for 10 seconds.
- the shrinkage rate in the first direction and the second direction perpendicular to the first direction may be adjusted within a specific range for each temperature.
- the shrinkage in the second direction is defined as T X ', T 70 ', T 75 ', T 80 ', T 90 'and T
- the range of 100 ' can be adjusted within a specific range.
- the heat treatment to obtain the T X ' may be immersing the polyester film in hot water at X° C. for 10 seconds.
- T 70 ′, T 75 ′, T 80 ′, T 90 ′, and T 100 ′ of the polyester film may each independently be -10% to 10%.
- T 70 ′, T 75 ′, T 80 ′, T 90 ′, and T 100 ′ of the polyester film are respectively -10% or more, -8% or more, -6% or more, -4% or more, It may be -2% or more or 0% or more, and may be 10% or less, 8% or less, 6% or less, 4% or less, or 2% or less.
- the polyester film according to the embodiment may have excellent adhesion by a solvent, that is, seaming properties.
- the polyester film may have a peel force of 300 gf/in or more after bonding with 1,3-dioxolane.
- the peeling force after adhesion by the 1,3-dioxolane may be 300 gf/in or more, 400 gf/in or more, 500 gf/in or more, 600 gf/in or more, or 700 gf/in or more, It may be 3000 gf/in or less, 2500 gf/in or less, 2000 gf/in or less, or 1500 gf/in or less.
- the peeling force of the polyester film is adjusted within the above range, it may be suitable for use in the seaming process of the polyester film.
- the peeling force is obtained by applying a solvent to the polyester film and laminating another sheet of polyester film thereon, applying a pressure of 160 Pa to the area to which the solvent is applied for 1 hour, and then applying the polyester film to 300 It can be measured under conditions of peeling at a speed of mm/min and an angle of 180°.
- FIG. 4 shows a method of measuring the adhesive property of a polyester film by a solvent.
- 1,3-dioxolane was applied to the first polyester film 100 in the form of a band having a width of 2 mm to form the adhesive portion 120 with an area of 0.6 cm 2 .
- a second polyester film 200 is attached thereon, a weight of 2 kg is placed on the adhesive part 120 and aged for 1 hour, and the two polyester films are placed at a speed of 300 mm/min and an angle of 180° The maximum force was measured while peeling with.
- the polyester film was cut into a rectangle having dimensions (x, y) of 9 cm and 3 cm long.
- the shrinkage stress in the main contraction direction may be adjusted within a specific range.
- the maximum stress in the main contraction direction may be 7.0 N or 6.0 N.
- the residual stress in the main contraction direction may be 6.0 N or 5.5 N.
- the heat treatment for obtaining the shrinkage stress may be specifically fixing the polyester film in the main shrinkage direction and immersing it in hot water at 90°C for 1 minute.
- the stress at the highest point may be the maximum stress
- the stress at the end of the contraction time may be the residual stress.
- Figure 5 shows a method of measuring the shrinkage stress of the polyester film.
- the first polyester film 100 has an initial dimension (x) 110 mm in a direction to be measured, an extra dimension (z) 5 mm at both ends, and a dimension (y) 15 mm in a direction perpendicular thereto It was cut (Fig. 5(a)).
- the cut film was mounted on the stress tester 2, and both ends of the film were fixed to the jig 21 at 100 mm intervals (FIG. 5(b)).
- the stress tester 2 equipped with the film was immersed in a water bath at 90° C. for 1 minute, and the maximum stress (S MAX ) in the contraction process, and the residual stress after contraction (S RES ) were measured with the load cell 22 (Fig. 5(c)).
- the polyester film according to the embodiment may have a skirt ratio adjusted within a specific range.
- the skirt ratio is the difference in length before and after contraction measured by fixing the polyester film with respect to the main contraction direction, and measuring the length before and after contraction in a direction perpendicular to the main contraction direction of the polyester film. It may be calculated as a ratio by dividing by the length of the polyester film with respect to the main contraction direction. More specifically, the skirt ratio measured under the condition of heat-treating the polyester film at a temperature of 90° C. for 10 seconds may be 17.4%.
- the polyester film 100 was cut into an initial dimension (x1) of 60 mm in the direction to be measured, and fixed with a jig 21 to a heat setting frame having a width (y) of 115 mm (Fig. 6 (a)). ). This was immersed in a 90° C. water bath for 10 seconds and then the reduced dimension (x2) was measured (FIG. 6(b)).
- the length after the contraction in the width direction TD which is the main contraction direction, is fixed, and the length after contraction in the longitudinal direction MD perpendicular thereto is measured and calculated according to the following equation.
- ⁇ SR (mm) x1 (mm)-x2 (mm)
- SR% (%) ⁇ SR (mm) / y (mm) ⁇ 100
- the glass transition temperature (Tg) measured by differential scanning calorimetry of the film may be 60°C or higher.
- the glass transition temperature (Tg) of the film measured with a differential scanning calorimeter may be 60°C or higher, 65°C or higher, 70°C or higher to less than 80°C, or 70°C to 75°C.
- the film may have a light transmittance of 90% or more at a wavelength of 550 nm.
- the light transmittance measured at 550 nm wavelength of the film before and after immersion in a 1% concentration of sodium hydroxide (NaOH) aqueous solution at a temperature of 85° C. is 90.5% or more, 91% or more, 92% or more, or 93% or more. I can.
- the amount of change in light transmittance before and after the film is immersed in a 1% concentration of sodium hydroxide (NaOH) aqueous solution at a temperature of 85° C. may be 0.7% or less.
- the amount of change in the light transmittance of the film before and after the immersion may be 0.6% or less or 0.5% or less.
- the amount of change in light transmittance refers to an absolute value of the difference between the light transmittance of the film measured at 550 nm wavelength before the immersion and the light transmittance of the film measured at 550 nm wavelength after the immersion.
- the amount of change ( ⁇ L) of Col-L before and after immersion of the film in a 1% concentration of sodium hydroxide (NaOH) aqueous solution at a temperature of 85° C. may be 0.7 or less, and the amount of change ( ⁇ a) of Col-a is 0.5 It may be less than or equal to, and the amount of change ( ⁇ b) of Col-b may be less than or equal to 0.5.
- the change amount ( ⁇ L) of Col-L before and after the immersion may be 0.65 or less, 0.6 or less, 0.55 or less, or 0.5 or less
- the change amount ( ⁇ a) of Col-a is 0.3 or less, 0.1 or less, 0.08 or less , 0.06 or less or 0.05 or less
- the change amount ( ⁇ b) of Col-b may be 0.3 or less, 0.1 or less, 0.08 or less, or 0.07 or less.
- the change amount ( ⁇ L) of Col-L means the absolute value of the difference between the Col-L value before the immersion and the value of Col-L after the immersion
- the change amount of Col-a ( ⁇ a) is the Col before the immersion It means the absolute value of the difference between the -a value and the Col-a value after the immersion
- the change amount ( ⁇ b) of the Col-b is the absolute difference between the Col-a value before the immersion and the Col-a value after the immersion Means value.
- the Col-L, Col-a, and Col-b are color systems established by the International Standard Color Measurement Organization (CIE (Commission International d'Eclairage)), and Color is L (brightness), a (green to red). Complementary colors) and b (complementary colors from yellow to blue) to express colors, and can be measured using UltraScan PRO (manufacturer: Hunterlab), but is not limited thereto.
- CIE Commission International d'Eclairage
- Color is L (brightness), a (green to red).
- Complementary colors) and b complementary colors from yellow to blue) to express colors, and can be measured using UltraScan PRO (manufacturer: Hunterlab), but is not limited thereto.
- the polyester film according to the embodiment includes a copolymerized polyester resin.
- the copolymerized polyester resin may be a polymerization of two or three or more diols and dicarboxylic acids, and more specifically, may be a copolymerized polyethylene terephthalate (Co-PET) resin.
- the diol is ethylene glycol, diethylene glycol, neopentyl glycol, propanediol substituted or unsubstituted with an alkyl group, butanediol substituted or unsubstituted with an alkyl group, pentanediol substituted or unsubstituted with an alkyl group, substituted with an alkyl group, or It may include at least one selected from the group consisting of unsubstituted hexanediol, octanediol substituted or unsubstituted with an alkyl group, and combinations thereof.
- the diol is ethylene glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 1,2-octanediol, 1,3-octanediol, 2,3-butanediol, 1,3-butanediol , 1,4-butanediol, 1,5-pentanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1,5-pentanediol, 2,4-diethyl- It may contain at least one selected from the group consisting of 1,5-pentanediol, 3-methyl-1,5-pentanediol, and 1,1-dimethyl-1,5-pentanediol.
- the dicarboxylic acid may include an aromatic dicarboxylic acid, an aliphatic dicarboxylic acid, an alicyclic dicarboxylic acid, or an esterified product thereof.
- the dicarboxylic acid may be terephthalic acid, dimethyl terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, orthophthalic acid, adipic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, esterified products thereof, or a combination thereof.
- the dicarboxylic acid may include at least one selected from the group consisting of terephthalic acid, dimethyl terephthalate, naphthalenedicarboxylic acid, and orthophthalic acid.
- the copolymerized polyester resin may be a polymerization of two or three or more diols and an aromatic dicarboxylic acid.
- the copolymerized polyester resin may be a diol containing ethylene glycol and one or more comonomers, and an aromatic dicarboxylic acid polymerized.
- the diol may include ethylene glycol, and may include at least one comonomer selected from the group consisting of neopentyl glycol and diethylene glycol.
- the diol may contain 50 to 90 mol% of ethylene glycol based on the total number of moles of the diol.
- the diol contains 60 mol% to 90 mol%, 65 mol% to 88 mol%, 68 mol% to 85 mol%, 70 mol% to 83 mol% or ethylene glycol based on the total number of moles of the diol. It may include 71 mol% to 80 mol%.
- the diol may contain 15 mol% or more of at least one comonomer selected from the group consisting of neopentyl glycol and diethylene glycol.
- the diol may contain at least one comonomer selected from the group consisting of neopentyl glycol and diethylene glycol in 17 mol% or more, 19 mol% or more, 20 mol% or more based on the total number of moles of the diol. It may include 15 mol% to 50 mol%, 15 mol% to 40 mol%, 17 mol% to 35 mol%, 19 mol% to 30 mol%, or 20 mol% to 29 mol%.
- the content of the comonomer satisfies the above range, it is possible to more effectively control crystallinity while having excellent heat contraction rate in the main contraction direction.
- the heat shrinkage property of the polyester film may be deteriorated.
- the heat shrinkage rate in the main shrinkage direction of the polyester film may not be sufficient at a specific temperature, and the heat shrinkage rate in the direction perpendicular to the main shrinkage direction of the polyester film may be too high at a specific temperature.
- the diol may contain diethylene glycol as a comonomer.
- the content of diethylene glycol in the diol may be 1 mol% to 10 mol%, 1 mol% to 8 mol%, 3 mol% to 6 mol%, or 3.5 mol% to 5.5 mol%.
- the diol may contain neopentyl glycol as a comonomer.
- the content of neopentyl glycol in the diol is 5 mol% to 35 mol%, 7 mol% to 33 mol%, 10 mol% to 30 mol%, 13 mol% to 28 mol%, or 15 mol% to 25 It may be mole percent.
- the thermal contraction rate in the first direction or in the second direction perpendicular to the first direction is easily adjusted when the film is thermally contracted, so that when the film is applied to a container, wrinkles or deformation are formed. This can be prevented more effectively from happening.
- the polyester-based resin may further contain a monohydric alcohol in addition to the diol component.
- the monohydric alcohol may be methanol, ethanol, isopropyl alcohol, allyl alcohol, or benzyl alcohol.
- the polyester-based resin contains 10 mol% to 30 mol%, 13 mol% to 25 mol%, or 15 mol% to 22 mol% of the monohydric alcohol based on the total number of moles of the diol component and the monohydric alcohol. It may be included in %, but is not limited thereto.
- the dicarboxylic acid may include an aromatic dicarboxylic acid.
- the dicarboxylic acid includes 80 mol% or more, 90 mol% or more, 95 mol% or more, 99 mol% or more, or 100 mol% of terephthalic acid or dimethyl terephthalic acid based on the total number of moles of the dicarboxylic acid. can do.
- the diol and the dicarboxylic acid may be polymerized after passing through a transesterification reaction to form a copolymerized polyester resin.
- a catalyst for the transesterification reaction one or more catalysts selected from the group consisting of manganese acetate tetrahydrate, calcium, and zinc may be used.
- the content of the catalyst may be 0.02 parts by weight to 0.2 parts by weight, 0.02 parts by weight to 0.1 parts by weight, or 0.05 parts by weight to 0.08 parts by weight based on the total weight of the dicarboxylic acid.
- the thickness of the polyester film may be 10 ⁇ m to 100 ⁇ m.
- the thickness of the base layer may be 20 ⁇ m to 80 ⁇ m, 30 ⁇ m to 70 ⁇ m, 35 ⁇ m to 65 ⁇ m, 35 ⁇ m to 55 ⁇ m, 40 ⁇ m to 60 ⁇ m, or 35 ⁇ m to 45 ⁇ m.
- a method for producing a polyester film includes the steps of preparing a copolymerized polyester resin in which a diol and a dicarboxylic acid are copolymerized; Melt-extruding the copolymerized polyester resin at a temperature of 250°C to 300°C to prepare an unstretched sheet; And a step of preparing a polyester film by stretching the unstretched sheet at a temperature of 70° C. to 100° C. and then heat setting at a temperature of 65° C. to 90° C., wherein the polyester film is subjected to a differential scanning calorimeter.
- the crystallization temperature (Tc) measured by calorimetry) is not measured, or the flakes of the polyethylene terephthalate (PET) container equipped with the polyester film are heat treated for 90 minutes at a temperature of 210°C. If so, the clumping ratio is 10% or less.
- composition and process conditions of the polyester film finally produced by the above method are adjusted to satisfy the above-described characteristics (crystallization temperature, shrinkage characteristics, etc.). Specifically, in order for the final polyester film to satisfy the characteristics described above, the composition of the copolymerized polyester resin is adjusted, and its extrusion temperature, casting temperature, preheating temperature during stretching, stretching ratio in each direction, stretching temperature, stretching speed, etc. Alternatively, the heat treatment temperature and relaxation rate may be adjusted while performing heat treatment and relaxation after stretching.
- a copolymerized polyester resin is prepared.
- the description of the copolymerized polyester resin is as described above.
- the polymerization of the copolymerized polyester resin may be carried out through a conventional transesterification reaction and a polycondensation reaction, and the diol and dicarboxylic acid components used at this time and their contents are as exemplified above.
- the copolymerized polyester resin is melt-extruded at a temperature of 250°C to 300°C or 260°C to 280°C, and then cooled to obtain an unstretched sheet. Chamber while transferring the unstretched sheet at a speed of 10 m/min to 110 m/min, 25 m/min to 90 m/min, 40 m/min to 80 m/min or 50 m/min to 60 m/min It can be preheated while passing through.
- the preheating may be performed at 90° C. to 120° C. for 0.01 to 1 minute.
- the preheating temperature T1 may be 95°C to 115°C or 97°C to 113°C, and the preheating time may be 0.05 to 0.5 minutes, and 0.08 to 0.2 minutes.
- the preheated unstretched sheet is stretched at a temperature of 70°C to 95°C.
- the stretching may be uniaxial stretching or biaxial stretching.
- the stretching may be uniaxial stretching performed in the transverse direction (TD), or biaxial stretching performed in the transverse direction (TD) after being performed in the longitudinal direction (MD).
- the stretching may be performed at a temperature of 10° C. to 20° C. lower than the preheating temperature T1.
- the stretching may be performed at 70°C to 100°C, 75°C to 100°C, 80°C to 98°C, or 83°C to 96°C.
- the stretching when the stretching is uniaxial stretching, the stretching may be performed at a stretching ratio of 3.5 times to 5 times, 3.5 times to 4.8 times, or 3.8 times to 4.6 times in the transverse direction (TD).
- the stretching when the stretching is biaxial stretching, the stretching is performed at a stretching ratio of 1.1 to 2 times or 1.1 to 1.5 times in the longitudinal direction (MD), and then 3.5 to 5 times, and 3.5 times in the transverse direction (TD). It can be carried out at a draw ratio of times to 4.8 times or 3.8 times to 4.6 times.
- a coating process may be additionally performed after the stretching. Specifically, a coating process may be additionally performed before uniaxial stretching in the transverse direction (TD) or before stretching in the transverse direction (TD) after stretching in the longitudinal direction (MD). More specifically, a coating process of forming an accelerating layer or the like capable of imparting functionality such as antistatic or the like to the film may be additionally performed. The coating process may be performed by spin coating or in-line coating, but is not limited thereto.
- the stretched sheet is heat-set at a temperature of 65°C to 90°C to prepare a polyester film.
- the heat setting may be annealing, and may be performed at a temperature of 65° C. to 90° C. for 0.01 to 1 minute.
- the heat setting temperature T2 may be 65°C to 85°C or 69°C to 81°C, and the heat setting time may be performed for 0.05 to 0.5 minutes or 0.08 to 0.2 minutes.
- a method for regenerating a polyethylene terephthalate container includes: preparing a polyethylene terephthalate (PET) container provided with the polyester film; Pulverizing the polyethylene terephthalate (PET) container provided with the film to obtain flakes; And heat-treating the flakes to prepare a recycled polyester chip, wherein when the flakes are heat-treated at a temperature of 210° C. for 90 minutes, a clumping ratio is 10% or less, and the flakes are the polyethylene terephthalate.
- PET A first flake obtained by pulverizing a container and a second flake obtained by pulverizing the polyester film are included.
- PET polyethylene terephthalate
- PET polyethylene terephthalate
- a recycled polyester chip can be manufactured without performing a separate process of removing a film surrounding a polyethylene terephthalate (PET) container, thereby reducing cost.
- PET polyethylene terephthalate
- the polyethylene terephthalate (PET) container is provided with the polyester film on the outer surface.
- the film may be shrunk by steam or hot air to wrap at least a part of the outer surface of the polyethylene terephthalate container.
- the polyester film may be a label of the polyethylene terephthalate container as a heat-shrinkable film, but is not limited thereto.
- polyester film The description of the polyester film is as described above.
- PET polyethylene terephthalate
- PET polyethylene terephthalate
- the flake includes a first flake obtained by pulverizing the polyester-based container and a second flake obtained by pulverizing the film.
- the first flake may have a particle size of 0.1 mm to 25 mm
- the second flake may have a particle size of 0.1 mm to 25 mm.
- the particle size of the first flake is 0.3 mm to 23 mm, 0.5 mm to 20 mm, 1 mm to 20 mm, 0.5 mm to 15 mm, 0.5 mm to 13 mm, 1 mm to 18 mm, 1 mm To 15 mm, 1 mm to 13 mm, or 2 mm to 10 mm
- the particle size of the second flake is 0.3 mm to 23 mm, 0.5 mm to 20 mm, 1 mm to 20 mm, 0.5 mm to 15 mm , 0.5 mm to 13 mm, 1 mm to 18 mm, 1 mm to 15 mm, 1 mm to 13 mm, or 2 mm to 10 mm, but is not limited thereto.
- a step of washing the pulverized flakes may be additionally performed.
- the washing step may be performed with a washing solution containing water and/or 1 part by weight of an aqueous sodium hydroxide solution at a temperature of 85°C to 90°C.
- the pulverized flakes may be first washed with water, second washed with the washing solution, and then third washed again with water.
- impurities that may remain in the pulverized flakes can be removed, as well as the ink components can be effectively removed, so that the quality and purity of the manufactured recycled polyester-based chips are improved to improve recyclability. Can be maximized.
- a step of drying the washed flakes at 60° C. to 175° C. for 10 minutes to 90 minutes may be additionally performed.
- the drying step is at 65°C to 175°C, 70°C to 170°C, 90°C to 165°C, 100°C to 165°C, 120°C to 165°C, 140°C to 165°C or 150°C to 165°C It may be performed for 10 minutes to 85 minutes, 10 minutes to 70 minutes, and 15 minutes to 30 minutes.
- the washing and drying step may be repeatedly performed 1 to 5 times. For example, by repeatedly performing the washing and drying steps 2 to 5 times or 3 to 5 times in order, impurities remaining in the flakes can be effectively removed.
- the flake includes a first flake obtained by pulverizing the polyethylene terephthalate (PET) container and a second flake obtained by pulverizing the polyester film.
- PET polyethylene terephthalate
- the heat treatment may be performed at 200° C. to 220° C. for 60 to 120 minutes.
- the heat treatment may be performed at 200°C to 215°C or 205°C to 220°C for 70 minutes to 120 minutes or 80 minutes to 120 minutes.
- the clumping fraction is 10% or less. Accordingly, since the clumping fraction that may occur due to the first flake and the second flake sticking together is low, the quality of the manufactured recycled polyester chip is excellent. Specifically, since the flake includes the second flake obtained by pulverizing the polyester film according to the embodiment, it is possible to improve the quality of the produced recycled polyester chip by effectively reducing or preventing the formation of aggregates.
- a recycled polyester chip After passing through the heat treatment process, a recycled polyester chip can be obtained. Specifically, after passing through the heat treatment process, a recycled polyester chip including the first flake and the second flake may be obtained. For example, after melt-extruding the flake, it may be cut to obtain a recycled polyester-based chip, but the present invention is not limited thereto.
- Recycled polyester chips according to another embodiment are manufactured by the method of recycling the polyethylene terephthalate container.
- the recycled polyester-based chip may include a first flake including polyethylene terephthalate (PET) and a second flake including a polyester resin.
- PET polyethylene terephthalate
- the intrinsic viscosity (IV) of the recycled polyester-based chip may be 0.55 dl/g or more.
- the intrinsic viscosity of the recycled polyester-based chip may be 0.58 dl/g or more or 0.59 dl/g or more, 0.55 dl/g to 3.0 dl/g, 0.55 dl/g to 2.0 dl/g, 0.55 dl /g to 1.0 dl/g, 0.58 dl/g to 0.85 dl/g, or 0.58 dl/g 0.7 dl/g.
- the recycled polyester chip may contain 70% to 99% by weight of polyethylene terephthalate based on the total weight of the recycled polyester chip, and 1% to 30% by weight of a copolymerized polyester resin.
- the recycled polyester chip contains 80% to 99% by weight, 90% to 99% by weight, or 95% to 99% by weight of polyethylene terephthalate based on the total weight of the recycled polyester chip. It may include, and may include 1% to 20% by weight, 1% to 10% by weight, or 1% to 5% by weight of a copolymerized polyester resin.
- TPA Terephthalic acid
- EG ethylene glycol
- a comonomer ethylene glycol
- a comonomer ethylene glycol
- manganese acetate as a catalyst for transesterification was added to 0.07 based on 100 parts by weight of dicarboxylic acid. After adding parts by weight, the reaction was carried out by removing methanol as a by-product while raising the temperature to 220°C.
- the copolymer polyester resin prepared in step (1) was extruded with a T-die at 270° C. and then cooled to obtain an unstretched sheet. Thereafter, the unstretched sheet was passed through a roll while being transferred at a speed of 55 m/min to adjust the thickness. The unstretched sheet was preheated at 105° C. for 0.1 minutes while being transferred at a speed of 55 m/min, and stretched 4.3 times in the transverse direction (TD) at 83° C. Thereafter, the stretched sheet was heat-set at a temperature of 69° C. for 0.1 minutes to prepare a polyester film having a thickness of 40 ⁇ m.
- a polyester film was prepared in the same manner as in Example 1-1, except that each composition, content, and process conditions were changed as described in Table 1 below.
- Example 1-1 100 72 24 - 4 83 69
- Example 1-2 100 80 16 - 4 88 75
- Example 1-3 100 80 16 - 4 90 71
- Example 1-4 100 80 16 - 4 90 80
- Example 1-5 100 78 17 - 5 96 81
- Example 1-6 100 71 24 - 5 85 70 Comparative Example 1-1 100 70 - 25 5 96 81
- the first endothermic temperature is the glass transition temperature (Tg, Glass Transition Temperature)
- the exothermic temperature measured after Tg is the crystallization temperature (Tc, CrystallizationTemperature)
- Tc CrystallizationTemperature
- Tm MetingTemperature
- the integral value at Tc was calculated as the calorific value of crystallization, and the higher the calorific value of crystallization, the faster the crystallization rate and the higher the transition rate to the crystal phase.
- Figure 3 shows a method of measuring the heat shrinkage rate of the polyester film.
- the polyester films 100 of Examples 1-1 to 1-6 and Comparative Example 1-1 prepared above were cut into 300 mm in a direction to be measured and 15 mm in a direction perpendicular thereto. I did.
- the 300 mm is the first dimension (x1) before contraction
- the 15 mm is the second dimension (Fig. 3(a)).
- the cut polyester film 100 is immersed in a water bath heated at 80°C or 90°C for 10 seconds, and then the contracted dimension of the polyester film 100a after contraction, that is, the first dimension after contraction (x2) was measured (Fig. 3(b)), and calculated according to the following formula.
- the thermal contraction rate (%) in this experimental example was obtained with respect to the main contraction direction (TD) of the film.
- Example 1-1 69.7% 79.3% 99.5 5.7 210.2
- Example 1-2 60.7% 69.7% 101.1 4.0 208.2
- Example 1-3 63.3% 75.7% 99.9 4.5 223.9
- Example 1-4 59.4% 71.7% 99.9 4.5 223.9
- Example 1-5 58.0% 70.0% - - 199
- Example 1-6 70.7% 78.8% 115.8 5.0 185.1 Comparative Example 1-1 68.0% 78.0% 82.0 0.1 166
- the thermal contraction rate, crystallization temperature (Tc) according to each temperature in the main contraction direction (TD), and the amount of heat of crystallization and melting point ( Tm) were all included within the preferred range.
- PET container 30 g
- PET container 30 g
- the polyester film of Example 1-1 was shrunk at a temperature of 90° C. and hot air conditions to obtain a polyethylene terephthalate container equipped with a polyester film.
- the container provided with the polyester film prepared in step (1) was pulverized with a grinder to obtain flakes.
- the flakes were first washed with water. Thereafter, a second washing was performed for 15 minutes with a washing solution (a mixture of 0.3 parts by weight of Triton X-100 solution and 1.0 parts by weight of NaOH solution) stirred in a water bath at 88° C. at a speed of 880 rpm. Thereafter, the secondary washed flakes were third washed with water at room temperature to remove the residual washing solution, and dried at 160° C. for 20 minutes.
- a washing solution a mixture of 0.3 parts by weight of Triton X-100 solution and 1.0 parts by weight of NaOH solution
- FIG. 2 shows a method of measuring the clumping of a polyethylene terephthalate (PET) container equipped with a polyester film.
- PET polyethylene terephthalate
- a product 1 in which a polyester film is provided as a label 11a in a polyethylene terephthalate (PET) container 20 is pulverized in a pulverizer 6, and the hole size is 9.5 mm.
- a sieve 0.374" sieve, not shown
- mixing consisting of 97 g of the first flakes 20a in which polyethylene terephthalate (PET) is crushed and 3 g of the second flakes 10a in which the polyester film is crushed I got a flake.
- the mixed flake was put into a cylinder having a diameter of 6 cm and a height of 8 cm, and a weight 7 of 2.5 kg was placed thereon to apply a load. Thereafter, the additionally raised cylinder was heat-treated in a convection oven at 210° C. for 90 minutes, and then cooled at room temperature.
- the cooled mixed flakes were placed on a second sieve (8, 0.625" sieve) with a hole diameter (d) of 11.2 mm, filtered, and then placed on the second sieve (8).
- the remaining agglomerated mixed flakes (10b) were collected and weighed.
- Clumping fraction (%) weight of agglomerated mixed flakes / weight of initial mixed flakes ⁇ 100
- Example 2-1 0 0.59
- Example 2-2 0.3 0.60
- Example 2-3 0 0.65
- Example 2-4 0 0.61
- Example 2-5 0.7 0.60
- Example 2-6 3.5 0.60 Comparative Example 2-1 22.6 0.65
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Abstract
Description
구분 | TPA (몰%) |
EG (몰%) |
NPG (몰%) |
CHEM (몰%) |
DEG (몰%) |
연신온도 (℃) |
열고정온도 (℃) |
실시예 1-1 | 100 | 72 | 24 | - | 4 | 83 | 69 |
실시예 1-2 | 100 | 80 | 16 | - | 4 | 88 | 75 |
실시예 1-3 | 100 | 80 | 16 | - | 4 | 90 | 71 |
실시예 1-4 | 100 | 80 | 16 | - | 4 | 90 | 80 |
실시예 1-5 | 100 | 78 | 17 | - | 5 | 96 | 81 |
실시예 1-6 | 100 | 71 | 24 | - | 5 | 85 | 70 |
비교예 1-1 | 100 | 70 | - | 25 | 5 | 96 | 81 |
구분 | TD 열수축률 (80℃) |
TD 열수축률 (90℃) |
Tc(℃) | 결정화 열량(J/g) |
Tm(℃) |
실시예 1-1 | 69.7% | 79.3% | 99.5 | 5.7 | 210.2 |
실시예 1-2 | 60.7% | 69.7% | 101.1 | 4.0 | 208.2 |
실시예 1-3 | 63.3% | 75.7% | 99.9 | 4.5 | 223.9 |
실시예 1-4 | 59.4% | 71.7% | 99.9 | 4.5 | 223.9 |
실시예 1-5 | 58.0% | 70.0% | - | - | 199 |
실시예 1-6 | 70.7% | 78.8% | 115.8 | 5.0 | 185.1 |
비교예 1-1 | 68.0% | 78.0% | 82.0 | 0.1 | 166 |
no. | 상대 점도 |
고유 점도 |
no. | 상대 점도 |
고유 점도 |
no. | 상대 점도 |
고유 점도 |
no. | 상대 점도 |
고유 점도 |
1 | 1.840 | 0.590 | 31 | 1.870 | 0.608 | 61 | 1.900 | 0.627 | 91 | 1.930 | 0.645 |
2 | 1.841 | 0.591 | 32 | 1.871 | 0.609 | 62 | 1.901 | 0.627 | 92 | 1.931 | 0.645 |
3 | 1.842 | 0.591 | 33 | 1.872 | 0.610 | 63 | 1.902 | 0.628 | 93 | 1.932 | 0.646 |
4 | 1.843 | 0.592 | 34 | 1.873 | 0.610 | 64 | 1.903 | 0.629 | 94 | 1.933 | 0.647 |
5 | 1.844 | 0.592 | 35 | 1.874 | 0.611 | 65 | 1.904 | 0.629 | 95 | 1.934 | 0.647 |
6 | 1.845 | 0.593 | 36 | 1.875 | 0.611 | 66 | 1.905 | 0.630 | 96 | 1.935 | 0.648 |
7 | 1.846 | 0.594 | 37 | 1.876 | 0.612 | 67 | 1.906 | 0.630 | 97 | 1.936 | 0.648 |
8 | 1.847 | 0.594 | 38 | 1.877 | 0.613 | 68 | 1.907 | 0.631 | 98 | 1.937 | 0.649 |
9 | 1.848 | 0.595 | 39 | 1.878 | 0.613 | 69 | 1.908 | 0.631 | 99 | 1.938 | 0.650 |
10 | 1.849 | 0.595 | 40 | 1.879 | 0.614 | 70 | 1.909 | 0.632 | 100 | 1.939 | 0.650 |
11 | 1.850 | 0.596 | 41 | 1.880 | 0.615 | 71 | 1.910 | 0.633 | 101 | 1.940 | 0.651 |
12 | 1.851 | 0.597 | 42 | 1.881 | 0.615 | 72 | 1.911 | 0.633 | 102 | 1.941 | 0.651 |
13 | 1.852 | 0.597 | 43 | 1.882 | 0.616 | 73 | 1.912 | 0.634 | 103 | 1.942 | 0.652 |
14 | 1.853 | 0.598 | 44 | 1.883 | 0.616 | 74 | 1.913 | 0.635 | 104 | 1.943 | 0.653 |
15 | 1.854 | 0.599 | 45 | 1.884 | 0.617 | 75 | 1.914 | 0.635 | 105 | 1.944 | 0.653 |
16 | 1.855 | 0.599 | 46 | 1.885 | 0.618 | 76 | 1.915 | 0.636 | 106 | 1.945 | 0.654 |
17 | 1.856 | 0.600 | 47 | 1.886 | 0.618 | 77 | 1.916 | 0.636 | 107 | 1.946 | 0.654 |
18 | 1.857 | 0.600 | 48 | 1.887 | 0.619 | 78 | 1.917 | 0.637 | 108 | 1.947 | 0.655 |
19 | 1.858 | 0.601 | 49 | 1.888 | 0.619 | 79 | 1.918 | 0.637 | 109 | 1.948 | 0.656 |
20 | 1.859 | 0.602 | 50 | 1.889 | 0.620 | 80 | 1.919 | 0.638 | 110 | 1.949 | 0.656 |
21 | 1.860 | 0.602 | 51 | 1.890 | 0.621 | 81 | 1.920 | 0.639 | 111 | 1.950 | 0.657 |
22 | 1.861 | 0.603 | 52 | 1.891 | 0.621 | 82 | 1.921 | 0.639 | 112 | 1.951 | 0.657 |
23 | 1.862 | 0.603 | 53 | 1.892 | 0.622 | 83 | 1.922 | 0.640 | 113 | 1.952 | 0.658 |
24 | 1.863 | 0.604 | 54 | 1.893 | 0.622 | 84 | 1.923 | 0.641 | 114 | 1.953 | 0.659 |
25 | 1.864 | 0.605 | 55 | 1.894 | 0.623 | 85 | 1.924 | 0.641 | 115 | 1.954 | 0.659 |
26 | 1.865 | 0.605 | 56 | 1.895 | 0.624 | 86 | 1.925 | 0.642 | 116 | 1.955 | 0.660 |
27 | 1.866 | 0.606 | 57 | 1.896 | 0.624 | 87 | 1.926 | 0.642 | 117 | 1.956 | 0.660 |
28 | 1.867 | 0.607 | 58 | 1.897 | 0.625 | 88 | 1.927 | 0.643 | 118 | 1.967 | 0.667 |
29 | 1.868 | 0.607 | 59 | 1.898 | 0.625 | 89 | 1.928 | 0.644 | 119 | 1.968 | 0.667 |
30 | 1.869 | 0.608 | 60 | 1.899 | 0.626 | 90 | 1.929 | 0.644 | 120 | 1.969 | 0.668 |
구분 | 클럼핑 분율(%) | 고유점도(dl/g) |
실시예 2-1 | 0 | 0.59 |
실시예 2-2 | 0.3 | 0.60 |
실시예 2-3 | 0 | 0.65 |
실시예 2-4 | 0 | 0.61 |
실시예 2-5 | 0.7 | 0.60 |
실시예 2-6 | 3.5 | 0.60 |
비교예 2-1 | 22.6 | 0.65 |
Claims (9)
- 디올 및 디카르복실산이 공중합된 공중합 폴리에스테르 수지를 포함하는 폴리에스테르 필름으로서,시차주사열량계(Differential Scanning Calorimetry)로 측정한 결정화 온도(Tc)가 측정되지 않거나, 70℃ 내지 130℃이고,상기 폴리에스테르 필름이 구비된 폴리에틸렌테레프탈레이트(PET) 용기를 분쇄한 플레이크를 210℃의 온도에서 90분 동안 열처리하는 경우 클럼핑 분율(clumping ratio)이 10% 이하인, 폴리에스테르 필름.
- 제 1 항에 있어서,상기 시차주사열량계로 측정한 결정화 온도(Tc)가 96℃ 내지 120℃이고, 용융점(Tm)이 170℃ 이상인, 폴리에스테르 필름.
- 제 1 항에 있어서,상기 클럼핑 분율이 5% 이하인, 폴리에스테르 필름.
- 제 1 항에 있어서,상기 결정화 온도(Tc)에서 측정한 결정화 열량이 0.01 J/g 내지 50 J/g인, 폴리에스테르 필름.
- 제 1 항에 있어서,80℃의 온도에서 10초 동안 열처리시 제 1 방향의 열수축률이 30% 이상인, 폴리에스테르 필름.
- 제 1 항에 있어서,상기 디올이 에틸렌글리콜을 포함하고, 네오펜틸글리콜 및 디에틸렌글리콜로 이루어진 군으로부터 선택된 1종 이상의 공단량체를 15 몰% 이상으로 포함하는, 폴리에스테르 필름.
- 제 6 항에 있어서,상기 디올이 상기 네오펜틸글리콜을 5 몰% 내지 35 몰%로 포함하고, 상기 디에틸렌글리콜을 1 몰% 내지 10 몰%로 포함하는, 폴리에스테르 필름.
- 디올 및 디카르복실산이 공중합된 공중합 폴리에스테르 수지를 제조하는 단계;상기 공중합 폴리에스테르 수지를 250℃ 내지 300℃의 온도에서 용융압출하여 미연신 시트를 제조하는 단계; 및상기 미연신 시트를 70℃ 내지 100℃의 온도에서 연신한 후, 65℃ 내지 90℃의 온도에서 열고정하여 폴리에스테르 필름을 제조하는 단계를 포함하고,상기 폴리에스테르 필름을 시차주사열량계(Differential Scanning Calorimetry)로 측정한 결정화 온도(Tc)가 측정되지 않거나, 70℃ 내지 130℃이고,상기 폴리에스테르 필름이 구비된 폴리에틸렌테레프탈레이트(PET) 용기를 분쇄한 플레이크를 210℃의 온도에서 90분 동안 열처리하는 경우 클럼핑 분율(clumping ratio)이 10% 이하인, 폴리에스테르 필름의 제조 방법.
- 제1항에 따른 폴리에스테르 필름이 구비된 폴리에틸렌테레프탈레이트(PET) 용기를 준비하는 단계;상기 필름이 구비된 폴리에틸렌테레프탈레이트(PET) 용기를 분쇄하여 플레이크를 얻는 단계; 및상기 플레이크를 열처리하여 재생 폴리에스테르 칩을 제조하는 단계를 포함하고,상기 플레이크를 210℃ 온도에서 90분 동안 열처리시 클럼핑 분율(clumping ratio)이 10% 이하이고,상기 플레이크가 상기 폴리에틸렌테레프탈레이트(PET) 용기가 분쇄되어 얻어지는 제 1 플레이크 및 상기 폴리에스테르 필름이 분쇄되어 얻어지는 제 2 플레이크를 포함하는, 폴리에틸렌테레프탈레이트 용기의 재생 방법.
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US17/293,580 US20220002477A1 (en) | 2019-10-31 | 2020-10-29 | Polyester film, preparation method thereof and method for reproducing polyethyleneterephthalate container using same |
MX2021006215A MX2021006215A (es) | 2019-10-31 | 2020-10-29 | Película de poliéster, método de preparación de la misma y método para reproducir contenedor de tereftalato de polietileno que utiliza la misma. |
EP20882979.6A EP3868813A4 (en) | 2019-10-31 | 2020-10-29 | POLYESTER FILM, METHOD FOR MAKING IT AND METHOD FOR RECYCLING A POLY(ETHYLENE TEREPHTHALATE) CONTAINER USING THE SAME |
AU2020375502A AU2020375502B2 (en) | 2019-10-31 | 2020-10-29 | Polyester film, method for manufacturing same, and method for recycling polyethylene terephthalate container using same |
CN202080006621.4A CN113166528A (zh) | 2019-10-31 | 2020-10-29 | 聚酯膜、其制备方法及使用其再生聚对苯二甲酸乙二醇酯容器的方法 |
JP2021529073A JP2022510146A (ja) | 2019-10-31 | 2020-10-29 | ポリエステルフィルム、その製造方法、およびこれを用いたポリエチレンテレフタレート容器の再生方法 |
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