WO2009131368A2 - Polyethyleneterephthalate layered sheet, and method and apparatus for producing the same - Google Patents

Polyethyleneterephthalate layered sheet, and method and apparatus for producing the same Download PDF

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Publication number
WO2009131368A2
WO2009131368A2 PCT/KR2009/002087 KR2009002087W WO2009131368A2 WO 2009131368 A2 WO2009131368 A2 WO 2009131368A2 KR 2009002087 W KR2009002087 W KR 2009002087W WO 2009131368 A2 WO2009131368 A2 WO 2009131368A2
Authority
WO
WIPO (PCT)
Prior art keywords
pet
resin
melting point
layered sheet
unit
Prior art date
Application number
PCT/KR2009/002087
Other languages
French (fr)
Other versions
WO2009131368A3 (en
Inventor
Wan-Kil Kim
Kwang Soo Lee
Original Assignee
Aylyn Mp Tech Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020080037529A external-priority patent/KR20090111917A/en
Priority claimed from KR1020080080370A external-priority patent/KR100897631B1/en
Priority claimed from KR1020080094694A external-priority patent/KR100897630B1/en
Application filed by Aylyn Mp Tech Co., Ltd. filed Critical Aylyn Mp Tech Co., Ltd.
Publication of WO2009131368A2 publication Critical patent/WO2009131368A2/en
Publication of WO2009131368A3 publication Critical patent/WO2009131368A3/en

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Definitions

  • the present invention relates to a polyethyleneterephthalate (PET) layered sheet including a PET layer, and an adhesive layer formed on either surface or both surfaces of the PET layer from a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145°C with an ester type polyurethane resin so as to provide various release extrusion products that enable ultraviolet rays (UV) protection and adhesion of carbon fibers, glass fibers, etc.
  • DSC differential scanning calorimetry
  • the present invention also relates to a method and apparatus for producing the PET layered sheet.
  • PET resins Since polyethyleneterephthalate (PET) resins have excellent moldability and recyclability, show high density and strength, and are inexpensive, they are expected to bring considerable benefit when processed into release extrusion products, including pipes, sheets, sashes, etc.
  • PET polyethyleneterephthalate
  • PET resins are not adhesive to other materials in nature. Thus, there is a certain limitation in producing reinforced products including PET resins and other materials adhered thereto. Due to this, PET resins are limited in their applications. Moreover, when PET resins are used in outdoor applications, they cause discoloration of molded articles in a short time due to their poor UV stability, and thus are significantly limited in practical use.
  • KR Patent Publication No. 10-2003-0075478 discloses a method for producing a layered sheet, which includes providing and stretching a sheet to provide a film, applying a coating solution containing a polyurethane resin, acrylic resin or nylon resin dissolved therein alone to the film, and laminating the coated film with another medium, such as a mat.
  • the method requires a solution coating process, in which adhesion of the medium is carried out before the solvent is evaporated. Therefore, the resultant layered sheet is not able to maintain the adhesive layer for a long time by itself, and thus the method cannot provide a finished layered sheet to be used by end-users.
  • the solution coating process suggested by the above method entails degradation of the transparency of the layered sheet due to the poor compatibility between the PET layer as a substrate and the adhesive layer, when the solvent is evaporated. Further, the layered sheet obtained from the above method causes partial interlayer separation between the PET layer and the adhesive layer, resulting in generation of defected products.
  • PET polyethyleneterephthalate
  • the PET layered sheet disclosed herein includes an adhesive layer formed on either surface or both surfaces of a PET layer from a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145°C with an ester type polyurethane resin.
  • DSC differential scanning calorimetry
  • a method and apparatus for producing the PET layered sheet are provided.
  • PET polyethyleneterephthalate
  • DSC differential scanning calorimetry
  • the PET layered sheet having an adhesive layer formed by the coextrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin has good compatibility with a PET layer, provides excellent adhesion at the adhesion interface, and enables ultraviolet rays (UV) protection and adhesion of carbon fibers, glass fibers, etc.
  • UV ultraviolet rays
  • the term 'PET resin' generally means the resin component in a substrate layer used for forming a PET molded article, and the term 'PET resin having no melting point as determined by DSC or having a melting point of 50-145°C' means a PET resin forming the adhesive layer.
  • a PET layered sheet including a PET layer and an adhesive layer formed on either surface or both surfaces of the PET layer, wherein the adhesive layer is formed by the coextrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin.
  • the PET layer includes a PET resin having a melting point (T m ) of 210-270°C.
  • the PET resin having such a low melting point of 50-145°C in forming the adhesive layer of the PET layered sheet disclosed herein provides more improved compatibility with the ester type polyurethane resin. Further, it is possible to realize improved miscibility with the ester type polyurethane resin in an extruder upon the coextrusion, so that a very uniform adhesive layer is formed and the adhesive layer has significantly improved surface smoothness and gloss.
  • the ester type polyurethane resin which is a highly elastic material having strong tensile property, is mixed with the PET resin having no melting point as determined by DSC or having a melting point of 50-145°C to impart excellent adhesion upon the adhesion to a substrate layer or to another resin.
  • the resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin is obtained by blending 10-300 parts by weight of the ester type polyurethane resin with 100 parts by weight of the PET resin having no melting point as determined by DSC or having a melting point of 50-145°C.
  • a horizontal extrusion process for producing the PET layered sheet which includes: melt extruding a PET resin in a first extruder of a horizontal extrusion apparatus; conveying the melt extruded PET resin to a die, introducing a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin to a second extruder installed at one side of the die, and carrying out horizontal coextrusion to form an adhesive layer on either surface or both surfaces of the PET layer; carrying out horizontal cooling of the PET layered sheet having the adhesive layer formed by the horizontal coextrusion in a first multi-stage cooling unit having a plurality of temperature profiles; and processing the PET layered sheet after the horizontal cooling.
  • a horizontal extrusion apparatus for producing the PET layered sheet, which includes: a first extruder in which a PET resin is introduced and melt extruded; a coextrusion unit including a die linked to one end of the first extruder, and a second extruder installed at one side of the die to perform melt extrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin, so that the resin or resin blend is introduced into the die and horizontally coextruded through the die; a first multi-stage cooling unit for cooling the resultant PET layered sheet discharged from the coextrusion unit, and having an adhesive layer formed from the polycarbonate resin or the resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin, wherein the first multi-stage cooling unit is linked integrally
  • Fig. 4 is a schematic view showing the horizontal extrusion apparatus for producing the PET layered sheet according to one embodiment.
  • the horizontal extrusion apparatus for producing the PET layered sheet having an adhesive layer may include a horizontal extrusion unit 100, a first extruder 110, a material introducing unit 111, a die 130, a coextrusion unit 140, a second extruder 150, and a first cooling unit 170.
  • the horizontal extrusion apparatus may further include a second cooling unit 200 in the downstream of the horizontal extrusion of the PET layered sheet having an adhesive layer.
  • the horizontal extrusion apparatus may include a drawing unit 310, a drying unit 330, an adhesion unit 350 and a compressing unit 370, as a processing section 300 for producing various articles.
  • the PET layered sheet disclosed herein may be obtained through the following horizontal extrusion process using the continuous type horizontal extrusion apparatus.
  • the horizontal extrusion process may include melt extruding a PET resin in the first extruder of the horizontal extrusion apparatus as mentioned above.
  • the PET resin that may be used includes not only general PET resins but also waste PET resins, recycled PET resins, etc.
  • the melt extrusion may be carried out at a temperature higher than the melting point of PET, particularly at a temperature of 250°C to 350°C, more particularly 250°C to 300°C. When the melt extrusion temperature is lower than 250°C, non-molten PET may still remain. On the other hand, a melt extrusion temperature higher than 350°C may cause a waste of energy needed to increase the temperature.
  • the melt extruded PET resin is conveyed to a die, while a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin is introduced into a second extruder installed at one side of the die, so that horizontal coextrusion is performed to form an adhesive layer on either surface or both surfaces of the PET layer.
  • a PET layer with an adhesive layer is provided.
  • the second extruder may have a melt extrusion temperature of 180-210°C.
  • Such horizontal extrusion prevents the extrudate from dropping in the vertical direction, thereby playing an important role in maintaining the shape of the extrudate.
  • ester type polyurethane resin serves to improve the adhesion via chemical reactions with an adhesive, when the adhesive, such as an epoxy or polyurethane adhesive, is additionally applied for the subsequent adhesion of a functional material that imparts functionality, such as strength reinforcement. In this manner, it is possible to obtain a PET layered sheet having an adhesive layer with excellent adhesive property.
  • the ester type polyurethane resin may include an ester type urethane resin or thermoplastic polyurethane (TPU) resin.
  • the die 130 may have a shape depending on the particular use, and non-limiting examples of the die shape include a sheet, pipe, profile, etc.
  • the resultant extrudate may have a thickness of 3 mm or higher.
  • the resultant extrudate may be produced to have a thickness of 5-20 mm depending on the particular use.
  • the PET layered sheet having a horizontally coextruded adhesive layer is subjected to horizontal cooling in a first multi-stage cooling unit having a plurality of temperature profiles.
  • the horizontal cooling prevents the PET layered sheet having an adhesive layer from dropping in the direction of gravity, after it is discharged from the coextrusion unit. In this manner, the PET layered sheet is allowed to maintain its shape while being conveyed to the first cooling unit.
  • the first cooling unit 170 may include an oil cooling unit or electric cooling unit.
  • the oil cooling unit controls cooling temperatures using hot oil, while the electric cooling unit controls cooling temperatures gradually using electricity.
  • the first cooling unit 170 including an oil cooling unit or electric cooling unit is provided right after the PET layered sheet having an adhesive layer is coextruded and discharged from the coextrusion unit in a molten state while maintaining the die shape.
  • the first cooling unit gradually controls the cooling temperature to perform gelling of the PET layered sheet.
  • the number and length of the stages of the first cooling unit may be determined depending on particular application in consideration of temperature-dependent shrinking of the PET layered sheet.
  • the first cooling unit may control the cooling temperature using hot oil or electricity, and the temperature may be controlled within 80-230°C.
  • the first cooling unit having a plurality of temperature profiles may be a three-stage or five-stage system.
  • temperature control may be performed gradually to 160°C, 145°C and 110°C.
  • temperature control may be performed through an increased number of stages, for example, gradually to 180°C, 160°C, 145°C, 110°C and 90°C.
  • the first cooling unit having a plurality of temperature profiles prevents distortion of the extrudate to improve the surface smoothness. Without such a multi-stage temperature profile, horizontal extrusion may not be realized in principle and may not be allowed in practice. For this reason, horizontal extrusion of a PET resin into a sheet-like or film-like shape has not been allowed to date.
  • the multi-stage cooling with a plurality of temperature profiles in the method disclosed herein allows the sheet or film to maintain its surface smoothness, thereby realizing excellent stability.
  • a second cooling unit 200 may be further provided in the downstream of the first cooling unit to perform further cooling with cooling water at 10-40°C.
  • the PET layered sheet having an adhesive layer may be processed through an additional processing section to obtain high-strength advanced materials and products.
  • the processing section includes a horizontal extrusion apparatus for the PET layered sheet having an adhesive layer, which may have a drawing unit, a drying unit, a functional material introducing unit, an adhesion unit and a compressing unit.
  • the PET sheet, pipe or profile having an adhesive layer is passed through the adhesion unit, in which an adhesive is applied thereto via a coating device, a functional material is adhered, and then the resultant product is compressed in the compressing unit.
  • the processing section may be adopted mainly for the production of high-strength advanced products.
  • the adhesive that may be applied to the PET layered sheet disclosed herein to enhance the adhesion includes an epoxy, polyurethane, phenol, fiber reinforced plastics (FRP), rubber adhesive, etc., but is not limited thereto.
  • the functional materials that may be used in this context include glass fibers, carbon fibers, aluminum, iron, rubber, fabric or combinations thereof, but are not limited thereto.
  • the press compressing system includes applying an adhesive, such as epoxy, to the PET layered sheet having an adhesive layer, and compressing the functional material as mentioned above against the PET layered sheet using a press.
  • the roll compressing system includes binding an adhesive, such as epoxy, to the PET layered sheet having an adhesive layer during the coextrusion thereof, wrapping the PET layered sheet with the functional material and compressing the resultant product with a roll.
  • the aforementioned adhesion and compressing operation may be repeated several times to obtain materials having more improved strength and quality.
  • the polyethyleneterephthalate (PET) layered sheet disclosed herein includes an adhesive layer formed by coating either surface or both surfaces of the PET layer with a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145°C with an ester type polyurethane resin, wherein the resin or resin blend has UV protectability and high adhesion, as well as high heat resistance and impact resistance.
  • the PET layered sheet allows production of articles having excellent UV protectability and weather resistance and enables adhesion of carbon fibers, glass fibers, etc.
  • the PET layered sheet disclosed herein may provide various release extrusion articles for various applications and purposes.
  • the PET layered sheet obtained by the horizontal extrusion process disclosed herein may have a relatively larger thickness of 3 mm or higher, and may be processed into various shapes, including pipes or profiles, which, otherwise, are difficult to be formed.
  • the method for producing a PET layered sheet disclosed herein includes the use of a multi-stage cooling unit having a plurality of temperature profiles, and thus results in significant improvements in the uniformity, smoothness and stability of the extrudate.
  • the horizontal extrusion apparatus disclosed herein performs a series of operations, including extrusion, cooling and processing of functionalized products, in a continuous manner, thereby realizing improved productivity.
  • Fig. 1 is an enlarged sectional view of the polyethyleneterephthalate (PET) layered sheet according to one embodiment.
  • PET polyethyleneterephthalate
  • Fig. 2 is an enlarged sectional view of the PET layered sheet according to another embodiment.
  • Fig. 3 is an enlarged sectional view of the PET layered sheet according to still another embodiment.
  • Fig. 4 is a schematic view showing the horizontal extrusion apparatus for producing the PET layered sheet according to one embodiment.
  • the polyethyleneterephthalate (PET) layered sheet disclosed herein includes an adhesive layer formed by coating either surface or both surfaces of a PET layer with a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145°C with an ester type polyurethane resin through the coextrusion during the extrusion of the PET resin in an extruder.
  • DSC differential scanning calorimetry
  • the ester type polyurethane resin that may be compatibilized with the PET resin having no melting point as determined by DSC or having a melting point of 50-145°C is generally used in various footwear soles or footwear parts.
  • the ester type polyurethane resin there is no particular limitation in particular types of the ester type polyurethane resin.
  • the mixing ratio of the PET resin having no melting point as determined by DSC or having a melting point of 50-145°C to the ester type polyurethane resin forming the adhesive layer 10-300 parts by weight, more specifically 70-150 parts by weight, of the ester type polyurethane resin may be mixed with 100 parts by weight of the PET resin having no melting point as determined by DSC or having a melting point of 50-145°C.
  • the 'PET resin having no melting point as determined by DSC or having a melting point of 50-145°C' may be determined by thermal analysis through a differential scanning calorimeter.
  • the thermal analysis may be performed using Perkin-Elmer DSC-7, wherein a given sample is preheated to 260°C at a heating rate of 200°C/min, maintained at this temperature for 2 minutes, and then cooled to 0°C. After the preheating, the sample is subjected to DSC from 40°C to 300°C at a scanning rate of 10°C/min.
  • Figs. 1 to 3 are enlarged sectional views of several embodiments of the PET layered sheets disclosed herein.
  • a PET resin is extruded at about 280°C in a conventional manner.
  • a polycarbonate resin is coextruded at about 250°C, so that an adhesive layer 2 is formed by coating on the surface of the PET layer 1.
  • the polycarbonate resin is formed by coating on the surface of the PET layer 1 to a coating thickness of 0.4 mm, regardless of the thickness of the PET layer, thereby forming the adhesive layer 2.
  • the adhesive layer 2 formed by coating the surface of the PET layer 1 with a polycarbonate resin has ultraviolet rays (UV) protectability by virtue of the polycarbonate having excellent weather resistance. Therefore, the resultant PET layered sheet having the adhesive layer solves the problem of weak UV resistance unique to PET resins, and thus realizes excellent weather resistance.
  • UV ultraviolet rays
  • the PET resin may be blended with the polycarbonate resin in a weight ratio of 1:3, and then the resin blend may be extruded to obtain a PET layered sheet having an adhesive layer 2.
  • Extrusion of the resin blend of the PET resin with the polycarbonate and formation of the adhesive layer 2 on the extrudate result in products having excellent moldability and strength.
  • the polycarbonate resin forming the adhesive layer 2 on the surface of the PET layer 1 may further include a UV protecting agent to provide an improved UV protecting effect.
  • the adhesive layer 2 formed by coating the polycarbonate resin on the surface of the PET layer 1 may be further coated with a paint 3 to provide an improved UV protecting effect and excellent moldability.
  • the resultant PET layered sheet may enable coloration with various colors, and thus may be processed into various products, such as window sashes, etc.
  • the adhesive layer 2 formed on the PET layer 1 by coating a polycarbonate resin has not only UV protectability but also high adhesive property, and thus facilitates adhesion of carbon fibers, glass fibers, etc. thereto.
  • reinforcing materials 4 such as carbon fibers, glass fibers, etc. may be adhered to release extrusion products of the PET layer 1 so as to obtain various release extrusion products having excellent strength and useful for various applications.
  • the surface of the adhesive layer 2 formed on the PET layer 1 by coating a polycarbonate resin, or the surface of the reinforcing materials 4 formed on the adhesive layer 2 may be subjected to plasma coating, so that the resultant products may be provided with excellent hardness.
  • a resin blend containing 100 parts by weight of a PET resin having a melting point of 75.3°C and 100 parts by weight of an ester type urethane resin (Bayer, 2102A) is melt kneaded and extruded at 195°C, while a PET resin having a melting point of 225°C is coextruded at 280°C.
  • the resin blend of the PET resin having a melting point of 75.3°C with the ester type urethane resin is laminated with the PET layer to provide a PET layered sheet having an adhesive layer.
  • the PET resin having a melting point of 75.3°C and the ester type urethane resin are blended in chip states in the above weight ratio before the resin blend is introduced to the extruder. While the PET resin having a melting point of 75.3°C is blended and molten with the ester type urethane resin, the resin blend is coated on the surface of the PET layer and coextruded therewith.
  • the resultant PET layered sheet includes a PET layer having a thickness of 2 mm, and an adhesive layer coextruded and laminated with the PET layer and having a thickness of 0.47 mm.
  • the PET layered sheet is subjected to a peeling test (KSMISO8510-1, 90 peel test). After the test, there is no evidence of interlayer separation.
  • the coextruded surface is very smooth and uniform as demonstrated by the absence of surface irregularities.
  • a mixture of PET chips having a melting point of 225°C with waste PET chips (40:60) is introduced into the material introducing unit 111 of the horizontal extrusion unit 100 as shown in Fig. 4 so that the mixture is melt extruded at 265°C in the first extruder 110.
  • a resin blend of a PET resin having a melting point of 75.3°C with an ester type urethane resin (Bayer, 2102A) (50:50) is introduced, so that the resin blend is coextruded into a sheet-like form at 200°C.
  • the coextruded PET layered sheet having an adhesive layer is cooled in a first cooling unit 170, whose temperature profile is controlled in a five-stage manner including 10 seconds at 200°C, 10 seconds at 180°C, 10 seconds at 160°C, 10 seconds at 145°C, and then 10 seconds at 110°C.
  • the PET layered sheet cooled in the first cooling unit is further cooled in a second cooling unit 200 controlled to 19°C, passed through a drawing unit 310, and dried in a drying unit 330.
  • an epoxy adhesive is adhered thereto in an adhesion unit 350, glass fibers are introduced through a functional material introducing unit 331, and then the PET layered sheet is compressed in a roll compressing unit 370 to finish a high-strength PET layered sheet having a thickness of 5 mm.
  • a mixture of PET chips having a melting point of 225°C with waste PET chips (40:60) is introduced into the material introducing unit 111 of the horizontal extrusion unit 100 as shown in Fig. 4 so that the mixture is melt extruded at 265°C in the first extruder 110.
  • a resin blend of a PET resin having a melting point of 78.5°C with an ester type urethane resin (Bayer, 2102A) (50:50) is introduced, so that the resin blend is coextruded into a pipe-like form at 200°C.
  • the coextruded PET pipe having an adhesive layer is cooled in a first cooling unit 170, whose temperature profile is controlled in a five-stage manner including 10 seconds at 200°C, 10 seconds at 180°C, 10 seconds at 160°C, 10 seconds at 145°C, and then 10 seconds at 110°C.
  • the PET layered sheet cooled in the first cooling unit is further cooled in a second cooling unit 200 controlled to 20°C, passed through a drawing unit 310, and dried in a drying unit 330.
  • an epoxy adhesive is adhered thereto in an adhesion unit 350, glass fibers are introduced through a functional material introducing unit 331, and then the PET pipe is compressed in a roll compressing unit 370 to finish a high-strength PET pipe having a thickness of 7 mm.
  • Example 2 is repeated, except that an ether type urethane resin (Bayer, 2101AU) is used instead of the resin blend of the PET resin having a melting point of 75.3°C with the ester type urethane resin (Bayer, 2102A) used in the adhesive layer of Example 2.
  • an ether type urethane resin (Bayer, 2101AU) is used instead of the resin blend of the PET resin having a melting point of 75.3°C with the ester type urethane resin (Bayer, 2102A) used in the adhesive layer of Example 2.
  • Example 2 is repeated, except that a resin blend of a PET resin having a melting point of 75.7°C with an ether type urethane resin (Bayer, 2101AU) (50:50) is used instead of the resin blend of PET resin having a melting point of 75.3°C with the ester type urethane resin (Bayer, 2102A) used in the adhesive layer of Example 2.
  • a resin blend of a PET resin having a melting point of 75.7°C with an ether type urethane resin (Bayer, 2101AU) (50:50)
  • the resin blend of PET resin having a melting point of 75.3°C with the ester type urethane resin (Bayer, 2102A) used in the adhesive layer of Example 2.
  • Comparative Example 2 the adhesive layer shows increased turbidity and low transparency due to the poor compatibility thereof. Comparative Examples 1 and 2 both show poor adhesive property as demonstrated by the presence of interlayer separation.

Abstract

Provided is a polyethyleneterephthalate (PET) layered sheet including a PET layer and an adhesive layer formed on either surface or both surfaces of the PET layer from a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-1450C with an ester type polyurethane resin. Provided also is a PET layered sheet(laminate) from which various release extrusion products that enables ultraviolet rays (UV) protection and adhesion of carbon fibers or glass fibers may be provided. A method and apparatus for producing the PET layered sheet are further provided.

Description

POLYETHYLENETEREPHTHALATE LAYERED SHEET, AND METHOD AND APPARATUS FOR PRODUCING THE SAME
The present invention relates to a polyethyleneterephthalate (PET) layered sheet including a PET layer, and an adhesive layer formed on either surface or both surfaces of the PET layer from a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145℃ with an ester type polyurethane resin so as to provide various release extrusion products that enable ultraviolet rays (UV) protection and adhesion of carbon fibers, glass fibers, etc. The present invention also relates to a method and apparatus for producing the PET layered sheet.
Since polyethyleneterephthalate (PET) resins have excellent moldability and recyclability, show high density and strength, and are inexpensive, they are expected to bring considerable benefit when processed into release extrusion products, including pipes, sheets, sashes, etc.
On the other hand, PET resins are not adhesive to other materials in nature. Thus, there is a certain limitation in producing reinforced products including PET resins and other materials adhered thereto. Due to this, PET resins are limited in their applications. Moreover, when PET resins are used in outdoor applications, they cause discoloration of molded articles in a short time due to their poor UV stability, and thus are significantly limited in practical use.
Many attempts have been made to solve the above-mentioned problem. For example, KR Patent Publication No. 10-2003-0075478 discloses a method for producing a layered sheet, which includes providing and stretching a sheet to provide a film, applying a coating solution containing a polyurethane resin, acrylic resin or nylon resin dissolved therein alone to the film, and laminating the coated film with another medium, such as a mat. However, the method requires a solution coating process, in which adhesion of the medium is carried out before the solvent is evaporated. Therefore, the resultant layered sheet is not able to maintain the adhesive layer for a long time by itself, and thus the method cannot provide a finished layered sheet to be used by end-users. In addition, the solution coating process suggested by the above method entails degradation of the transparency of the layered sheet due to the poor compatibility between the PET layer as a substrate and the adhesive layer, when the solvent is evaporated. Further, the layered sheet obtained from the above method causes partial interlayer separation between the PET layer and the adhesive layer, resulting in generation of defected products.
Provided is a polyethyleneterephthalate (PET) layered sheet that solves the above-mentioned problem related to poor ultraviolet rays (UV) stability of a PET resin. The PET layered sheet disclosed herein includes an adhesive layer formed on either surface or both surfaces of a PET layer from a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145℃ with an ester type polyurethane resin. Provided also is a PET layered sheet having an adhesive layer capable of providing release extrusion products that enable UV protection and adhesion of carbon fibers, glass fibers, etc. Further, provided are a method and apparatus for producing the PET layered sheet.
In one aspect, there is provided a polyethyleneterephthalate (PET) layered sheet(laminate) using a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145℃ with an ester type polyurethane resin.
The PET layered sheet having an adhesive layer formed by the coextrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin has good compatibility with a PET layer, provides excellent adhesion at the adhesion interface, and enables ultraviolet rays (UV) protection and adhesion of carbon fibers, glass fibers, etc.
Unless otherwise stated, the term 'PET resin' generally means the resin component in a substrate layer used for forming a PET molded article, and the term 'PET resin having no melting point as determined by DSC or having a melting point of 50-145℃' means a PET resin forming the adhesive layer.
In another aspect, there are provided a method and apparatus for producing the PET layered sheet disclosed herein.
Hereinafter, the embodiments of the present invention will be described in detail.
In one aspect, there is provided a PET layered sheet including a PET layer and an adhesive layer formed on either surface or both surfaces of the PET layer, wherein the adhesive layer is formed by the coextrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin.
The PET layer includes a PET resin having a melting point (Tm) of 210-270℃.
Use of the PET resin having such a low melting point of 50-145℃ in forming the adhesive layer of the PET layered sheet disclosed herein provides more improved compatibility with the ester type polyurethane resin. Further, it is possible to realize improved miscibility with the ester type polyurethane resin in an extruder upon the coextrusion, so that a very uniform adhesive layer is formed and the adhesive layer has significantly improved surface smoothness and gloss. In addition, the ester type polyurethane resin, which is a highly elastic material having strong tensile property, is mixed with the PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ to impart excellent adhesion upon the adhesion to a substrate layer or to another resin.
The resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin is obtained by blending 10-300 parts by weight of the ester type polyurethane resin with 100 parts by weight of the PET resin having no melting point as determined by DSC or having a melting point of 50-145℃.
The PET layered sheet disclosed herein is obtained via the following horizontal extrusion process. In another aspect, there is provided a horizontal extrusion process for producing the PET layered sheet, which includes: melt extruding a PET resin in a first extruder of a horizontal extrusion apparatus; conveying the melt extruded PET resin to a die, introducing a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin to a second extruder installed at one side of the die, and carrying out horizontal coextrusion to form an adhesive layer on either surface or both surfaces of the PET layer; carrying out horizontal cooling of the PET layered sheet having the adhesive layer formed by the horizontal coextrusion in a first multi-stage cooling unit having a plurality of temperature profiles; and processing the PET layered sheet after the horizontal cooling.
In still another aspect, there is provided a horizontal extrusion apparatus for producing the PET layered sheet, which includes: a first extruder in which a PET resin is introduced and melt extruded; a coextrusion unit including a die linked to one end of the first extruder, and a second extruder installed at one side of the die to perform melt extrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin, so that the resin or resin blend is introduced into the die and horizontally coextruded through the die; a first multi-stage cooling unit for cooling the resultant PET layered sheet discharged from the coextrusion unit, and having an adhesive layer formed from the polycarbonate resin or the resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin, wherein the first multi-stage cooling unit is linked integrally with the die, has a plurality of temperature profiles and is formed horizontally; and a processing section for processing the PET layered sheet having passed through the first cooling unit.
Exemplary embodiments now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. In the drawings, like reference numerals in the drawings denote like elements. In the description of the present invention, details of well-known feature and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments.
Fig. 4 is a schematic view showing the horizontal extrusion apparatus for producing the PET layered sheet according to one embodiment. Referring to Fig. 4, the horizontal extrusion apparatus for producing the PET layered sheet having an adhesive layer may include a horizontal extrusion unit 100, a first extruder 110, a material introducing unit 111, a die 130, a coextrusion unit 140, a second extruder 150, and a first cooling unit 170. The horizontal extrusion apparatus may further include a second cooling unit 200 in the downstream of the horizontal extrusion of the PET layered sheet having an adhesive layer. Subsequently, the horizontal extrusion apparatus may include a drawing unit 310, a drying unit 330, an adhesion unit 350 and a compressing unit 370, as a processing section 300 for producing various articles.
The PET layered sheet disclosed herein may be obtained through the following horizontal extrusion process using the continuous type horizontal extrusion apparatus.
The horizontal extrusion process may include melt extruding a PET resin in the first extruder of the horizontal extrusion apparatus as mentioned above.
The PET resin that may be used includes not only general PET resins but also waste PET resins, recycled PET resins, etc. In addition, the melt extrusion may be carried out at a temperature higher than the melting point of PET, particularly at a temperature of 250℃ to 350℃, more particularly 250℃ to 300℃. When the melt extrusion temperature is lower than 250℃, non-molten PET may still remain. On the other hand, a melt extrusion temperature higher than 350℃ may cause a waste of energy needed to increase the temperature.
Then, the melt extruded PET resin is conveyed to a die, while a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin is introduced into a second extruder installed at one side of the die, so that horizontal coextrusion is performed to form an adhesive layer on either surface or both surfaces of the PET layer.
More particularly, the polycarbonate resin or the resin bled of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin, melt extruded from the second extruder 150 installed at one side of the die 130, is subjected to horizontal coextrusion in a coextrusion unit 140 installed in such a manner that the resin or resin blend is ejected horizontally in combination with the PET resin melt extruded and conveyed from the first extruder 110. In this manner, a PET layer with an adhesive layer is provided. The second extruder may have a melt extrusion temperature of 180-210℃.
Such horizontal extrusion prevents the extrudate from dropping in the vertical direction, thereby playing an important role in maintaining the shape of the extrudate.
In addition, use of the resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin causes a phase separation between the PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ and the PET resin extruded from the first extruder 110 due to a difference in their physical properties, thereby forming a layered structure. Further, the ester type polyurethane resin serves to improve the adhesion via chemical reactions with an adhesive, when the adhesive, such as an epoxy or polyurethane adhesive, is additionally applied for the subsequent adhesion of a functional material that imparts functionality, such as strength reinforcement. In this manner, it is possible to obtain a PET layered sheet having an adhesive layer with excellent adhesive property. The ester type polyurethane resin may include an ester type urethane resin or thermoplastic polyurethane (TPU) resin.
The die 130 may have a shape depending on the particular use, and non-limiting examples of the die shape include a sheet, pipe, profile, etc. The resultant extrudate may have a thickness of 3 mm or higher. For example, the resultant extrudate may be produced to have a thickness of 5-20 mm depending on the particular use.
After the coextrusion, the PET layered sheet having a horizontally coextruded adhesive layer is subjected to horizontal cooling in a first multi-stage cooling unit having a plurality of temperature profiles.
The horizontal cooling prevents the PET layered sheet having an adhesive layer from dropping in the direction of gravity, after it is discharged from the coextrusion unit. In this manner, the PET layered sheet is allowed to maintain its shape while being conveyed to the first cooling unit.
The first cooling unit 170 may include an oil cooling unit or electric cooling unit. The oil cooling unit controls cooling temperatures using hot oil, while the electric cooling unit controls cooling temperatures gradually using electricity.
The first cooling unit 170 including an oil cooling unit or electric cooling unit is provided right after the PET layered sheet having an adhesive layer is coextruded and discharged from the coextrusion unit in a molten state while maintaining the die shape. The first cooling unit gradually controls the cooling temperature to perform gelling of the PET layered sheet. The number and length of the stages of the first cooling unit may be determined depending on particular application in consideration of temperature-dependent shrinking of the PET layered sheet.
The first cooling unit may control the cooling temperature using hot oil or electricity, and the temperature may be controlled within 80-230℃.
The first cooling unit having a plurality of temperature profiles may be a three-stage or five-stage system. When the horizontal coextrusion temperature is 180-200℃, temperature control may be performed gradually to 160℃, 145℃ and 110℃. When the horizontal coextrusion temperature is 200-210℃, temperature control may be performed through an increased number of stages, for example, gradually to 180℃, 160℃, 145℃, 110℃ and 90℃.
The first cooling unit having a plurality of temperature profiles prevents distortion of the extrudate to improve the surface smoothness. Without such a multi-stage temperature profile, horizontal extrusion may not be realized in principle and may not be allowed in practice. For this reason, horizontal extrusion of a PET resin into a sheet-like or film-like shape has not been allowed to date. However, the multi-stage cooling with a plurality of temperature profiles in the method disclosed herein allows the sheet or film to maintain its surface smoothness, thereby realizing excellent stability.
In addition, a second cooling unit 200 may be further provided in the downstream of the first cooling unit to perform further cooling with cooling water at 10-40℃.
Finally, the PET layered sheet after the horizontal cooling is continuously processed to obtain finished products with various functionalities.
The PET layered sheet having an adhesive layer may be processed through an additional processing section to obtain high-strength advanced materials and products.
The processing section includes a horizontal extrusion apparatus for the PET layered sheet having an adhesive layer, which may have a drawing unit, a drying unit, a functional material introducing unit, an adhesion unit and a compressing unit.
For example, in the processing section 300, the PET sheet, pipe or profile having an adhesive layer is passed through the adhesion unit, in which an adhesive is applied thereto via a coating device, a functional material is adhered, and then the resultant product is compressed in the compressing unit. The processing section may be adopted mainly for the production of high-strength advanced products.
The adhesive that may be applied to the PET layered sheet disclosed herein to enhance the adhesion includes an epoxy, polyurethane, phenol, fiber reinforced plastics (FRP), rubber adhesive, etc., but is not limited thereto. In addition, the functional materials that may be used in this context include glass fibers, carbon fibers, aluminum, iron, rubber, fabric or combinations thereof, but are not limited thereto.
Meanwhile, the compressing operation may be carried out after the adhesion of the functional material using a press or roll compressing system, but is not limited thereto. The press compressing system includes applying an adhesive, such as epoxy, to the PET layered sheet having an adhesive layer, and compressing the functional material as mentioned above against the PET layered sheet using a press. In addition, the roll compressing system includes binding an adhesive, such as epoxy, to the PET layered sheet having an adhesive layer during the coextrusion thereof, wrapping the PET layered sheet with the functional material and compressing the resultant product with a roll.
The aforementioned adhesion and compressing operation may be repeated several times to obtain materials having more improved strength and quality.
As mentioned above, the polyethyleneterephthalate (PET) layered sheet disclosed herein includes an adhesive layer formed by coating either surface or both surfaces of the PET layer with a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin, wherein the resin or resin blend has UV protectability and high adhesion, as well as high heat resistance and impact resistance. Thus, the PET layered sheet allows production of articles having excellent UV protectability and weather resistance and enables adhesion of carbon fibers, glass fibers, etc. As a result, the PET layered sheet disclosed herein may provide various release extrusion articles for various applications and purposes.
In addition, the PET layered sheet obtained by the horizontal extrusion process disclosed herein may have a relatively larger thickness of 3 mm or higher, and may be processed into various shapes, including pipes or profiles, which, otherwise, are difficult to be formed.
Further, the method for producing a PET layered sheet disclosed herein includes the use of a multi-stage cooling unit having a plurality of temperature profiles, and thus results in significant improvements in the uniformity, smoothness and stability of the extrudate. The horizontal extrusion apparatus disclosed herein performs a series of operations, including extrusion, cooling and processing of functionalized products, in a continuous manner, thereby realizing improved productivity.
The above and other aspects, features and advantages of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:
Fig. 1 is an enlarged sectional view of the polyethyleneterephthalate (PET) layered sheet according to one embodiment.
Fig. 2 is an enlarged sectional view of the PET layered sheet according to another embodiment.
Fig. 3 is an enlarged sectional view of the PET layered sheet according to still another embodiment.
[Detailed Description of Main Elements]
1: PET layer
2: adhesive layer
3: paint
4: reinforcing material
Fig. 4 is a schematic view showing the horizontal extrusion apparatus for producing the PET layered sheet according to one embodiment.
[Detailed Description of Main Elements]
100: horizontal extrusion unit
110: first extruder
111: material introducing unit
130: die
140: coextrusion unit
150: second extruder
170: first cooling unit
200: second cooling unit
300: processing section
310: drawing unit
330: drying unit
331: functional material introducing unit
350: adhesion unit
370: compressing unit
The polyethyleneterephthalate (PET) layered sheet disclosed herein includes an adhesive layer formed by coating either surface or both surfaces of a PET layer with a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145℃ with an ester type polyurethane resin through the coextrusion during the extrusion of the PET resin in an extruder.
The ester type polyurethane resin that may be compatibilized with the PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ is generally used in various footwear soles or footwear parts. Thus, there is no particular limitation in particular types of the ester type polyurethane resin.
Although there is no particular limitation in the mixing ratio of the PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ to the ester type polyurethane resin forming the adhesive layer, 10-300 parts by weight, more specifically 70-150 parts by weight, of the ester type polyurethane resin may be mixed with 100 parts by weight of the PET resin having no melting point as determined by DSC or having a melting point of 50-145℃.
As used herein, the 'PET resin having no melting point as determined by DSC or having a melting point of 50-145℃' may be determined by thermal analysis through a differential scanning calorimeter. The thermal analysis may be performed using Perkin-Elmer DSC-7, wherein a given sample is preheated to 260℃ at a heating rate of 200℃/min, maintained at this temperature for 2 minutes, and then cooled to 0℃. After the preheating, the sample is subjected to DSC from 40℃ to 300℃ at a scanning rate of 10℃/min.
Figs. 1 to 3 are enlarged sectional views of several embodiments of the PET layered sheets disclosed herein.
The examples will now be described. The following examples are for illustrative purposes only and not intended to limit the scope of this disclosure.
[Example 1]
A PET resin is extruded at about 280℃ in a conventional manner. During the extrusion of the PET resin, a polycarbonate resin is coextruded at about 250℃, so that an adhesive layer 2 is formed by coating on the surface of the PET layer 1.
Herein, the polycarbonate resin is formed by coating on the surface of the PET layer 1 to a coating thickness of 0.4 mm, regardless of the thickness of the PET layer, thereby forming the adhesive layer 2.
The adhesive layer 2 formed by coating the surface of the PET layer 1 with a polycarbonate resin has ultraviolet rays (UV) protectability by virtue of the polycarbonate having excellent weather resistance. Therefore, the resultant PET layered sheet having the adhesive layer solves the problem of weak UV resistance unique to PET resins, and thus realizes excellent weather resistance.
The PET resin may be blended with the polycarbonate resin in a weight ratio of 1:3, and then the resin blend may be extruded to obtain a PET layered sheet having an adhesive layer 2.
Extrusion of the resin blend of the PET resin with the polycarbonate and formation of the adhesive layer 2 on the extrudate result in products having excellent moldability and strength.
Meanwhile, the polycarbonate resin forming the adhesive layer 2 on the surface of the PET layer 1 may further include a UV protecting agent to provide an improved UV protecting effect.
In addition, the adhesive layer 2 formed by coating the polycarbonate resin on the surface of the PET layer 1 may be further coated with a paint 3 to provide an improved UV protecting effect and excellent moldability. In this case, the resultant PET layered sheet may enable coloration with various colors, and thus may be processed into various products, such as window sashes, etc.
As shown in Fig. 3, the adhesive layer 2 formed on the PET layer 1 by coating a polycarbonate resin has not only UV protectability but also high adhesive property, and thus facilitates adhesion of carbon fibers, glass fibers, etc. thereto.
Therefore, reinforcing materials 4, such as carbon fibers, glass fibers, etc. may be adhered to release extrusion products of the PET layer 1 so as to obtain various release extrusion products having excellent strength and useful for various applications.
Further, the surface of the adhesive layer 2 formed on the PET layer 1 by coating a polycarbonate resin, or the surface of the reinforcing materials 4 formed on the adhesive layer 2 may be subjected to plasma coating, so that the resultant products may be provided with excellent hardness.
[Example 2]
A resin blend containing 100 parts by weight of a PET resin having a melting point of 75.3℃ and 100 parts by weight of an ester type urethane resin (Bayer, 2102A) is melt kneaded and extruded at 195℃, while a PET resin having a melting point of 225℃ is coextruded at 280℃. In this manner, the resin blend of the PET resin having a melting point of 75.3℃ with the ester type urethane resin is laminated with the PET layer to provide a PET layered sheet having an adhesive layer.
Herein, the PET resin having a melting point of 75.3℃ and the ester type urethane resin are blended in chip states in the above weight ratio before the resin blend is introduced to the extruder. While the PET resin having a melting point of 75.3℃ is blended and molten with the ester type urethane resin, the resin blend is coated on the surface of the PET layer and coextruded therewith.
The resultant PET layered sheet includes a PET layer having a thickness of 2 mm, and an adhesive layer coextruded and laminated with the PET layer and having a thickness of 0.47 mm.
To evaluate the adhesion between the adhesive layer and the PET layer, the PET layered sheet is subjected to a peeling test (KSMISO8510-1, 90 peel test). After the test, there is no evidence of interlayer separation.
In addition, the coextruded surface is very smooth and uniform as demonstrated by the absence of surface irregularities. When the PET layered sheet is exposed to the exterior as it is, there is no change in color even after three months.
[Example 3]
A mixture of PET chips having a melting point of 225℃ with waste PET chips (40:60) is introduced into the material introducing unit 111 of the horizontal extrusion unit 100 as shown in Fig. 4 so that the mixture is melt extruded at 265℃ in the first extruder 110. To a second extruder 130, a resin blend of a PET resin having a melting point of 75.3℃ with an ester type urethane resin (Bayer, 2102A) (50:50) is introduced, so that the resin blend is coextruded into a sheet-like form at 200℃.
The coextruded PET layered sheet having an adhesive layer is cooled in a first cooling unit 170, whose temperature profile is controlled in a five-stage manner including 10 seconds at 200℃, 10 seconds at 180℃, 10 seconds at 160℃, 10 seconds at 145℃, and then 10 seconds at 110℃. To impart dimensional stability, the PET layered sheet cooled in the first cooling unit is further cooled in a second cooling unit 200 controlled to 19℃, passed through a drawing unit 310, and dried in a drying unit 330. Then, an epoxy adhesive is adhered thereto in an adhesion unit 350, glass fibers are introduced through a functional material introducing unit 331, and then the PET layered sheet is compressed in a roll compressing unit 370 to finish a high-strength PET layered sheet having a thickness of 5 mm.
[Example 4]
A mixture of PET chips having a melting point of 225℃ with waste PET chips (40:60) is introduced into the material introducing unit 111 of the horizontal extrusion unit 100 as shown in Fig. 4 so that the mixture is melt extruded at 265℃ in the first extruder 110. To a second extruder 130, a resin blend of a PET resin having a melting point of 78.5℃ with an ester type urethane resin (Bayer, 2102A) (50:50) is introduced, so that the resin blend is coextruded into a pipe-like form at 200℃.
The coextruded PET pipe having an adhesive layer is cooled in a first cooling unit 170, whose temperature profile is controlled in a five-stage manner including 10 seconds at 200℃, 10 seconds at 180℃, 10 seconds at 160℃, 10 seconds at 145℃, and then 10 seconds at 110℃. To impart dimensional stability, the PET layered sheet cooled in the first cooling unit is further cooled in a second cooling unit 200 controlled to 20℃, passed through a drawing unit 310, and dried in a drying unit 330. Then, an epoxy adhesive is adhered thereto in an adhesion unit 350, glass fibers are introduced through a functional material introducing unit 331, and then the PET pipe is compressed in a roll compressing unit 370 to finish a high-strength PET pipe having a thickness of 7 mm.
[Comparative Example 1]
Example 2 is repeated, except that an ether type urethane resin (Bayer, 2101AU) is used instead of the resin blend of the PET resin having a melting point of 75.3℃ with the ester type urethane resin (Bayer, 2102A) used in the adhesive layer of Example 2.
[Comparative Example 2]
Example 2 is repeated, except that a resin blend of a PET resin having a melting point of 75.7℃ with an ether type urethane resin (Bayer, 2101AU) (50:50) is used instead of the resin blend of PET resin having a melting point of 75.3℃ with the ester type urethane resin (Bayer, 2102A) used in the adhesive layer of Example 2.
In Comparative Example 2, the adhesive layer shows increased turbidity and low transparency due to the poor compatibility thereof. Comparative Examples 1 and 2 both show poor adhesive property as demonstrated by the presence of interlayer separation.
While the present invention has been described with respect to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (12)

  1. A polyethyleneterephthalate (PET) layered sheet comprising a PET layer and an adhesive layer stacked on either surface or both surfaces of the PET layer, wherein the adhesive layer is formed by coextrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by differential scanning calorimetry (DSC) or having a melting point of 50-145℃ with an ester type polyurethane resin.
  2. The PET layered sheet according to claim 1, wherein the PET layer comprises a PET resin having a melting point of 210-270℃.
  3. The PET layered sheet according to claim 1, wherein the resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin is obtained by blending 100 parts by weight of the PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with 10-300 parts by weight of the ester type polyurethane resin.
  4. A horizontal extrusion process of PET, comprising:
    melt extruding a PET resin in a first extruder of a horizontal extrusion apparatus;
    conveying the melt extruded PET resin to a die, introducing a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin to a second extruder installed at one side of the die, and carrying out horizontal coextrusion to form an adhesive layer on either surface or both surfaces of the PET layer;
    carrying out horizontal cooling of the PET layered sheet having the adhesive layer formed by the horizontal coextrusion in a first multi-stage cooling unit having a plurality of temperature profiles; and
    processing the PET layered sheet after the horizontal cooling.
  5. The horizontal extrusion process of PET according to claim 4, wherein the PET layered sheet is further subjected to horizontal cooling in a second cooling unit, after the PET layered sheet is cooled in the first cooling unit.
  6. The horizontal extrusion process of PET according to claim 4, wherein the PET layered sheet is processed by applying an adhesive thereto and adhering a functional material to the PET layered sheet, followed by compression.
  7. The horizontal extrusion process of PET according to claim 6, wherein the adhesive is selected from the group consisting of epoxy, polyurethane, phenol, fiber reinforced plastics (FRP), rubber adhesives or combinations thereof, and the functional material is selected from the group consisting of glass fibers, carbon fibers, aluminum, iron, rubber, fabric or combinations thereof.
  8. The horizontal extrusion process of PET according to claim 6, wherein the compression is carried out using a press compressing system or roll compressing system.
  9. A horizontal extrusion apparatus of PET, comprising:
    a first extruder in which a PET resin is introduced and melt extruded;
    a coextrusion unit including a die linked to one end of the first extruder, and a second extruder installed at one side of the die to perform melt extrusion of a polycarbonate resin or a resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin, so that the resin or resin blend is introduced into the die and horizontally coextruded through the die;
    a first multi-stage cooling unit for cooling the resultant PET layered sheet discharged from the coextrusion unit, and having an adhesive layer formed from the polycarbonate resin or the resin blend of a PET resin having no melting point as determined by DSC or having a melting point of 50-145℃ with an ester type polyurethane resin, wherein the first multi-stage cooling unit is linked integrally with the die, has a plurality of temperature profiles and is formed horizontally; and
    a processing section for processing the PET layered sheet having passed through the first cooling unit.
  10. The horizontal extrusion apparatus of PET according to claim 9, which further comprises a second cooling unit at one end of the first cooling unit.
  11. The horizontal extrusion apparatus of PET according to claim 9, wherein the processing section comprises a drawing unit, a drying unit, a functional material introducing unit, an adhesion unit and a compressing unit.
  12. The horizontal extrusion apparatus of PET according to claim 11, wherein the compressing unit is based on press compression or roll compression.
PCT/KR2009/002087 2008-04-23 2009-04-22 Polyethyleneterephthalate layered sheet, and method and apparatus for producing the same WO2009131368A2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR10-2008-0037529 2008-04-23
KR1020080037529A KR20090111917A (en) 2008-04-23 2008-04-23 Polyethylen terephthalate having glue layer and Its methode
KR1020080080370A KR100897631B1 (en) 2008-08-18 2008-08-18 Laminated polyethyleneterephthalate sheet having good adhiveness with other layer and its preparation method
KR10-2008-0080370 2008-08-18
KR10-2008-0094694 2008-09-26
KR1020080094694A KR100897630B1 (en) 2008-09-26 2008-09-26 A method of extruding polyethyleneterephthalate horizontally and horizontal extruder

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CN115038569A (en) * 2020-02-13 2022-09-09 日立造船株式会社 Method for producing fiber-containing sheet and fiber-containing sheet
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CN115038569A (en) * 2020-02-13 2022-09-09 日立造船株式会社 Method for producing fiber-containing sheet and fiber-containing sheet
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CN115257019B (en) * 2022-06-07 2023-10-31 江苏民扬塑胶科技有限公司 High-strength PET composite board and processing technology thereof

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