CN113698651A - Anti-rainbow-pattern polyester film - Google Patents

Anti-rainbow-pattern polyester film Download PDF

Info

Publication number
CN113698651A
CN113698651A CN202111010579.6A CN202111010579A CN113698651A CN 113698651 A CN113698651 A CN 113698651A CN 202111010579 A CN202111010579 A CN 202111010579A CN 113698651 A CN113698651 A CN 113698651A
Authority
CN
China
Prior art keywords
coating
rainbow
layer
film
base film
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202111010579.6A
Other languages
Chinese (zh)
Inventor
吴培服
吴迪
王琪
顾洋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Original Assignee
Jiangsu Shuangxing Color Plastic New Materials 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
Application filed by Jiangsu Shuangxing Color Plastic New Materials Co Ltd filed Critical Jiangsu Shuangxing Color Plastic New Materials Co Ltd
Priority to CN202111010579.6A priority Critical patent/CN113698651A/en
Publication of CN113698651A publication Critical patent/CN113698651A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/418—Refractive

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The application discloses an anti-rainbow-pattern polyester film, which at least comprises a polyester base film with a refractive index of 1.63-1.65, at least one surface of the polyester base film is provided with an on-line coating with a refractive index of 1.55-1.60, and a hardened layer with a refractive index of 1.40-1.50 is formed on the outer side of the on-line coating. This application provides the online coating of one deck between polyester base film and sclerosis layer, and its refracting index just is between polyester base film and sclerosis layer, and the technical effect of eliminating the rainbow line is obtained in the gradient matching through the refracting index, and the scheme of this application need not add the solid particle thing of high refractive index, has avoided the problem that the luminousness descends. In addition, the scheme of not containing incompatible substances is adopted, the influence of stretching and curing in the process of online coating on the uniformity of the coating thickness is relatively low, the good flatness is kept, and the coating has good adhesion.

Description

Anti-rainbow-pattern polyester film
Technical Field
The invention relates to a polyester film which can be used in the photoelectric field, in particular to a polyester film with anti-interference rainbow lines.
Background
The polyester film has excellent optical, mechanical, electrical, thermal and mechanical properties, and has wide application in the photoelectric field. Polyester films used in the field of optoelectronics are usually hardened by coating a UV resin on the surface of the polyester film, which is used as a base film, to improve the abrasion resistance of the polyester film. However, the hardened polyester film is likely to have a phenomenon of reflected light interference, i.e., rainbow fringes, due to factors such as a difference in thickness between the base film and the hardened layer, a variation in coating composition, and a mismatch in refractive index. The presence of rainbow lines can affect the transmittance and visual effect of the product.
CN 102514275A discloses an optical polyester film and a preparation method thereof, the film comprises a polyester base film stretched in two directions and a bottom coating coated on at least one surface of the polyester base film, the bottom coating contains a filler with a refractive index of 1.55-2.50, and the content of solid components in a coating liquid for forming the bottom coating is 5-10% by weight. This prior art increases the under coat through the mode of online coating between polyester base film and sclerosis layer to this rainbow line problem that appears after solving the hardcoat processing. However, this prior art specifically mentions that the key to solving the problem of refractive index mismatch is the inclusion of high refractive index incompatible solid oxide components in the primer coating solution.
The on-line coating is a process of directly coating chemicals on the film by an on-line coating machine on a production line of the film so as to enhance and improve the surface function and the special physical and chemical indexes of the film and meet the use requirements of special products. Corresponding to the in-line coating is an off-line coating in which the film is produced and then coated. The online coating is different from the offline coating, and has the biggest characteristics of no need of rewinding, thin and uniform coating, high speed, high efficiency and low cost. Compared with the off-line coating technology, the on-line coating has the quality basically the same as that of off-line coating, but the cost is greatly reduced.
The on-line coating adopted in the prior art is to coat the primer solution before the polyester base film is stretched, and then to perform biaxial stretching. Since the coating thickness of the primer liquid is much reduced after the biaxial stretching, the solid oxide particles distributed in the primer liquid easily scratch the surface during the biaxial stretching, and if the particles are aggregated or have excessively large particle diameters, bubbles are formed around the particles during the stretching, further causing non-uniformity in the thickness of the primer layer and seriously affecting the transparency of the primer layer. To reduce the adverse effects of the solid oxide, strict control of the dispersion of the solid components, coating equipment, and processes is required, which severely increases the cost and production efficiency of on-line coating.
Disclosure of Invention
The technical problem to be solved by the present application is to provide a rainbow-grain-resistant polyester film to reduce or avoid the aforementioned problems.
In order to solve the technical problem, the application provides a rainbow-pattern-resistant polyester film, which at least comprises a polyester base film with a refractive index of 1.63-1.65, at least one surface of the polyester base film is provided with an online coating with a refractive index of 1.55-1.60, and a hardened layer with a refractive index of 1.40-1.50 is formed on the outer side of the online coating.
Preferably, the in-line coating layer is formed by curing acrylic adhesives, polycarbonate, ethyl acrylate, polyethylene oxide, tetrahydrofuran and ethylene-vinyl acetate copolymer through in-line coating.
Preferably, the mass ratio of each component of the on-line coating is respectively that the acrylic adhesive: polycarbonate (C): ethyl acrylate: polyethylene oxide: tetrahydrofuran: the ethylene-vinyl acetate copolymer is 100: (5-10): 100: (10-15): (2-3): (10-15).
Preferably, the polyester-based film is a three-layer composite structure.
In addition, the application also provides a preparation method of the rainbow-pattern-resistant polyester film, which comprises the following steps:
preheating and drying PET slices at 160-180 ℃, adding the PET slices into a double-screw extruder, adjusting the temperature of the double-screw extruder to 270-280 ℃, melting, filtering, and extruding thick slices;
preheating the thick sheet at the temperature of 50-90 ℃, feeding the thick sheet into an infrared heating zone at the temperature of 300-500 ℃, and longitudinally stretching at the linear speed of 40-150 m/min, wherein the longitudinal stretching ratio is 3.0-4.5, so as to obtain a stretched sheet;
uniformly mixing the components of the on-line coating according to the weight ratio of the raw materials to form a bottom coating liquid, preheating to 120 ℃, and then coating the bottom coating liquid on a stretching sheet on line;
preheating a stretching sheet at the temperature of 90-120 ℃, and performing transverse stretching at the temperature of 100-160 ℃, wherein the transverse stretching ratio is 3.0-4.5;
then shaping at 160-240 ℃, cooling at 100-50 ℃, shaping, cooling, and finally rolling to obtain a polyester base film;
and then, uniformly coating the bottom coating liquid of the hardened layer on the surface of the polyester base film, and curing to form the hardened layer, thereby preparing the rainbow-grain-resistant polyester film, and finally receiving the coil.
This application provides the online coating of one deck between polyester base film and sclerosis layer, and its refracting index just is between polyester base film and sclerosis layer, and the technical effect of eliminating the rainbow line is obtained in the gradient matching through the refracting index, and the scheme of this application need not add the solid particle thing of high refractive index, has avoided the problem that the luminousness descends. In addition, the scheme of not containing incompatible substances is adopted, the influence of stretching and curing in the process of online coating on the uniformity of the coating thickness is relatively low, the good flatness is kept, and the coating has good adhesion.
Drawings
The drawings are only for purposes of illustrating and explaining the present application and are not to be construed as limiting the scope of the present application.
Fig. 1 is a schematic structural view of an anti-iridescence polyester film according to an embodiment of the present application.
Fig. 2a and 2b show light reflectance curves for prior art and present application polyester films, respectively.
Fig. 3 is a schematic structural view showing an apparatus for manufacturing an anti-iridescence-moire polyester film according to an embodiment of the present application.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present application, embodiments of the present application will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
In order to solve the defects of the background art, the present application provides an anti-rainbow-pattern polyester film, as shown in fig. 1, the anti-rainbow-pattern polyester film at least comprises a polyester base film 1 with a refractive index of 1.63-1.65, at least one surface of the polyester base film 1 is provided with an online coating layer 2 with a refractive index of 1.55-1.60, and a hardened layer 3 with a refractive index of 1.40-1.50 is formed on the outer side of the online coating layer 2. In the illustrated embodiment, an in-line coating layer 2 having a refractive index of 1.55 to 1.60 is formed on both surfaces of the polyester-based film 1 by in-line coating.
The basic idea of this application anti rainbow line is that it is located polyester base film 1 and online coating 2 between the sclerosis layer 3 to provide one deck, and its refracting index just lies in polyester base film 1 and hardens between layer 3, and the gradient through the refracting index matches the technological effect that obtains eliminating the rainbow line.
In one embodiment, the in-line coating layer 2 is formed by curing an acrylic adhesive, polycarbonate, ethyl acrylate, polyethylene oxide, tetrahydrofuran, and ethylene-vinyl acetate copolymer by in-line coating. The hardened layer 3 may be formed by curing a material commonly used in the art, and preferably, a water-soluble resin material, such as an acrylic resin material, may be used. Of course, those skilled in the art may also use the UV hardening resin and the like used in the prior art cited in the background art.
Specifically, the mass ratio of each component of the on-line coating 2 is, respectively, acrylic acid adhesive: polycarbonate (C): ethyl acrylate: polyethylene oxide: tetrahydrofuran: the ethylene-vinyl acetate copolymer is 100: (5-10): 100: (10-15): (2-3): (10-15). Wherein, the acrylic adhesive can be SAA1451 acrylic adhesive produced by Sichuan space Sanwa chemical company Limited, and the solid content is 40-45% by mass. The ethylene-vinyl acetate copolymer may be an ethylene-vinyl acetate copolymer available from Mitsui corporation of Japan and having a trade name of Evaflex 550, wherein the vinyl acetate polymer is contained in an amount of 14% by mass.
Fig. 2a and 2b show the light reflectivity curves of the prior art and the polyester film of the present application, respectively, wherein it can be clearly seen that the reflectivity of the prior art polyester film without the on-line coating layer is different for the light with different wavelengths, while the polyester film of the present application has a structure with matched refractive index gradient, so that the reflectivity of the light with the wavelength range of 500nm-700nm is substantially consistent, and therefore the polyester film of the present application eliminates the problem of mutual interference of the light with different wavelengths in the visual sensitive area, so as to obtain the technical effect of rainbow texture resistance.
The refractive index of the primer layer adopted in the prior art CN 102514275 a is very high, and incompatible high refractive index solid particles need to be added, however, in the biaxial stretching process, these particles can cause coating pores, which affects light transmittance, and is very unfavorable for the application in the field of photoelectricity. This application has adopted the scheme of middle refracting index, need not add the solid particulate matter of high refracting index, has avoided the problem that the luminousness descends. The scheme that the coating does not contain incompatible substances is adopted, the influence of stretching and curing on the uniformity of the thickness of the coating during online coating is relatively low, the good flatness is kept, and the adhesiveness of the coating is relatively good.
In another embodiment of the present application, the refractive index of the polyester base film 1 is preferably 1.64, the refractive index of the in-line coating layer 2 is 1.57 to 1.59, and the refractive index of the hardened layer 3 is 1.40 to 1.50. In a further embodiment of the present application, the thickness of the polyester-based film 1 is 50 to 100 μm, the thickness of the on-line coating layer 2 is preferably 0.5 to 5 μm, and the thickness of the hardened layer 3 is 1 to 10 μm.
Example 1
The preparation method comprises the steps of taking PET slices as raw materials, obtaining a single-layer thick sheet through melt extrusion, longitudinally stretching after preheating, coating a mixture of components of the online coating after longitudinally stretching, transversely stretching, sizing, cooling, rolling, and coating a hardened layer off line to obtain the rainbow-pattern-resistant polyester film.
Polyester base film: PET, thickness 50 μm
And (3) online coating: thickness of 0.5 μm
A hardened layer: thickness of 1 μm
In this example, the polyester-based film was a single-layer structure made of PET.
The method for manufacturing the rainbow-streak-resistant polyester film of this embodiment is further described below with reference to fig. 3, wherein fig. 3 is a schematic structural diagram of an apparatus for manufacturing the rainbow-streak-resistant polyester film according to an embodiment of the present application.
As shown in the figure, the manufacturing apparatus of the rainbow-vein-resistant polyester film of the present application sequentially comprises a mixing bin 100, a feeder 201, a twin-screw extruder 202, a longitudinal stretching mechanism 203, a transverse stretching mechanism 204 and a film winding mechanism 205 according to a film stretching process flow. Wherein, the above parts of the manufacturing equipment of the application can adopt the existing parts in the prior art.
In one embodiment of the present application, an in-line coating mechanism 300 is disposed between the longitudinal stretching mechanism 203 and the transverse stretching mechanism 204. The inline coating mechanism 300 includes at least one pair of coating rollers 301 for coating the drawn sheet formed by the longitudinal drawing mechanism 203 on both sides to form an inline coating. The inline coating mechanism 300 further includes a common liquid bath 303 for supplying the substrate liquid to the pair of coating rollers 301 through the pipes. The person skilled in the art can also apply the liquid to the surface of the film by other known application means than an application roller, based on the prior art. Of course, the manufacturing equipment is not limited to coating only the specific on-line coating liquid disclosed herein, but may also be used to coat any one of the coating liquids on the surface of the stretch sheet to produce a polyester film that achieves any other desired functionality.
In addition, the manufacturing apparatus of the present application further includes a hardened layer coating mechanism 400 that forms a hardened layer by coating, wherein the hardened layer coating mechanism 400 further includes a hardened layer coating roller 401 that coats the hardened layer on the surface of the polyester base film obtained by the polyester base film winding mechanism 205 and a hardened layer liquid tank 402 that conveys the hardened layer to the hardened layer coating roller 401. The hardened layer coating mechanism 400 may further include an ultraviolet light irradiation device (not shown in the drawings) for performing UV irradiation curing on the hardened layer using UV curing, depending on the composition of the hardened layer.
The rainbow-pattern-resistant polyester film obtained in the steps can be directly conveyed to a production line for production. Of course, in most cases, the produced iridescence-resistant polyester film will need to be wound up for packaging for shipment and sale. In addition, the manufacturing equipment of the application can further comprise a material collecting roller 600 for winding the prepared rainbow-vein-resistant polyester film, and the rainbow-vein-resistant polyester film can be packaged for transportation and sale after being wound into a roller shape by the material collecting roller 600.
The preparation method of the rainbow-streak-resistant polyester film of the embodiment comprises the following steps.
The PET slices are measured by an electronic scale, enter a mixing bin 100, are preheated at 160-180 ℃, dried and mixed, then the mixture is added into a double-screw extruder 202 through a feeder 201, the temperature of the double-screw extruder is adjusted to 270-280 ℃, and after melting, the mixture is filtered and extruded into thick slices.
Preheating the thick sheet at the temperature of 50-90 ℃, entering an infrared heating zone at the temperature of 300-500 ℃, and longitudinally stretching the thick sheet through a longitudinal stretching mechanism 203 at the linear speed of 40-150 m/min, wherein the longitudinal stretching ratio is 3.0-4.5, so as to obtain the stretched sheet.
The components of the on-line coating are respectively and uniformly mixed into the bottom coating liquid according to the weight ratio of the raw materials in the subsequent table, the bottom coating liquid is transferred into the liquid tank 303 and preheated to 120 ℃, and then the bottom coating liquid is coated on the stretching sheet on line through the coating roller 301.
Preheating the stretching sheet at the temperature of 90-120 ℃, and transversely stretching the stretching sheet at the temperature of 100-160 ℃ by a transverse stretching mechanism 204, wherein the transverse stretching magnification is 3.0-4.5.
Then shaping is carried out at the temperature of 160-240 ℃, and then cooling, shaping and cooling are carried out at the temperature of 100-50 ℃, and finally the polyester base film is rolled by a film rolling mechanism 205 to obtain the polyester base film.
And then, uniformly mixing the purchased or prefabricated raw material components of the hardened layer to obtain the hardened layer bottom coating liquid. The mixed bottom liquid of the hardened layer is transferred to a hardened layer liquid tank 402. And then uniformly coating the hardened layer bottom coating liquid on the surface of the polyester base film through a hardened layer coating roller 401, and curing to form a hardened layer, so that the rainbow-pattern-resistant polyester film is prepared, and finally, a material is received through a material receiving roller 600 to form a roll for subsequent transportation, sale and the like.
The on-line coating adopts the scheme of not containing incompatible substances, so that the bottom liquid coating can be relatively thin, and the integrity of the surface of the on-line coating can be better ensured under the condition of a small stretching multiplying power before the longitudinal stretching and the transverse stretching are selected for the on-line coating. In the prior art, as the coating contains solid particles, the bottom liquid coating cannot be too thin, otherwise the particles easily damage the surface quality of the base film and damage the optical performance; however, if the coating is selected before stretching, the defect of surface quality degradation due to too high stretching ratio is difficult to avoid, and particularly the defect of occurrence of holes under large stretching ratio is difficult to overcome.
Example 2
The anti-rainbow-grain polyester film is prepared by taking a PETG (polyethylene terephthalate) slice as a surface layer and a bottom layer raw material, taking the PET slice as a core layer raw material, carrying out melt co-extrusion to obtain a thick sheet with a three-layer structure, longitudinally stretching after preheating, coating a mixture of each component of the online coating of the application on line after longitudinally stretching, then transversely stretching, sizing, cooling and rolling, and coating a hardened layer off line at last.
Polyester base film: PETG/PET/PETG with a thickness of 10 μm/80 μm/10 μm, respectively
And (3) online coating: thickness of 5 μm
A hardened layer: thickness of 10 μm
In this embodiment, the polyester-based film is a three-layer composite structure, in which the surface layer and the bottom layer are PETG, and the core layer is PET. In addition, compared with example 1, the preparation method of this embodiment is different only in that single-layer extrusion is changed into three-layer co-extrusion, which are mature technologies in the prior art.
Example 3
The method comprises the steps of taking a PET slice containing 0.1-0.5 wt% of silicon dioxide as a surface layer raw material and a bottom layer raw material, taking a common PET slice as a core layer raw material, carrying out melt co-extrusion to obtain a thick slice with a three-layer structure, carrying out longitudinal stretching after preheating, carrying out online coating on a mixture of components of the online coating after the longitudinal stretching, then carrying out transverse stretching, sizing, cooling and rolling, and finally carrying out offline coating on a hardened layer to obtain the rainbow-streak-resistant polyester film.
Polyester base film: PET (SiO)2)/PET/PET(SiO2) The thickness is 15 μm/50 μm/15 μm respectively
And (3) online coating: thickness of 2 μm
A hardened layer: thickness of 5 μm
In this embodiment, the polyester-based film is a three-layer composite structure made of PETG/PET/PETG, wherein the PETG is a surface layer and a bottom layer, and the core layer is PET. In addition, compared with example 1, the preparation method of this embodiment is different only in that single-layer extrusion is changed into three-layer co-extrusion, which are mature technologies in the prior art.
The raw material components (parts by weight) and performance parameters of the above examples 1 to 3 are shown in the following table.
Figure BDA0003238370410000081
For the raw material components (parts by weight) and performance parameters of the comparative examples of the above examples, see the following table.
Figure BDA0003238370410000082
Figure BDA0003238370410000091
The polyester films of comparative examples 1 to 3 all had rainbow patterns visible to the naked eye.
It should be appreciated by those skilled in the art that while the present application is described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is thus given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including all technical equivalents which are encompassed by the claims and are to be interpreted as combined with each other in a different embodiment so as to cover the scope of the present application.
The above description is only illustrative of the present invention and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of this application shall fall within the scope of this application.

Claims (5)

1. The rainbow-pattern-resistant polyester film at least comprises a polyester base film (1) with a refractive index of 1.63-1.65, at least one surface of the polyester base film (1) is provided with an online coating layer (2) with a refractive index of 1.55-1.60, and a hardening layer (3) with a refractive index of 1.40-1.50 is formed on the outer side of the online coating layer (2).
2. The rainbow-grain-resistant polyester film as claimed in claim 1, wherein the in-line coating layer (2) is formed by curing an acrylic adhesive, polycarbonate, ethyl acrylate, polyethylene oxide, tetrahydrofuran, and ethylene-vinyl acetate copolymer by in-line coating.
3. The rainbow-grain-resistant polyester film as claimed in claim 2, wherein the on-line coating layer (2) comprises the following components in mass ratio: polycarbonate (C): ethyl acrylate: polyethylene oxide: tetrahydrofuran: the ethylene-vinyl acetate copolymer is 100: (5-10): 100: (10-15): (2-3): (10-15).
4. The rainbow-streak-resistant polyester film according to any one of claims 1 to 3, wherein the polyester-based film (1) is a three-layer composite structure.
5. A method for preparing the rainbow-streak-resistant polyester film according to any one of claims 1 to 3, comprising the steps of:
preheating and drying PET slices at 160-180 ℃, adding the PET slices into a double-screw extruder, adjusting the temperature of the double-screw extruder to 270-280 ℃, melting, filtering, and extruding thick slices;
preheating the thick sheet at the temperature of 50-90 ℃, feeding the thick sheet into an infrared heating zone at the temperature of 300-500 ℃, and longitudinally stretching at the linear speed of 40-150 m/min, wherein the longitudinal stretching ratio is 3.0-4.5, so as to obtain a stretched sheet;
uniformly mixing the components of the on-line coating according to the weight ratio of the raw materials to form a bottom coating liquid, preheating to 120 ℃, and then coating the bottom coating liquid on a stretching sheet on line;
preheating a stretching sheet at the temperature of 90-120 ℃, and performing transverse stretching at the temperature of 100-160 ℃, wherein the transverse stretching ratio is 3.0-4.5;
then shaping at 160-240 ℃, cooling at 100-50 ℃, shaping, cooling, and finally rolling to obtain a polyester base film;
and then, uniformly coating the bottom coating liquid of the hardened layer on the surface of the polyester base film, and curing to form the hardened layer, thereby preparing the rainbow-grain-resistant polyester film, and finally receiving the coil.
CN202111010579.6A 2021-08-31 2021-08-31 Anti-rainbow-pattern polyester film Pending CN113698651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111010579.6A CN113698651A (en) 2021-08-31 2021-08-31 Anti-rainbow-pattern polyester film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111010579.6A CN113698651A (en) 2021-08-31 2021-08-31 Anti-rainbow-pattern polyester film

Publications (1)

Publication Number Publication Date
CN113698651A true CN113698651A (en) 2021-11-26

Family

ID=78657832

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111010579.6A Pending CN113698651A (en) 2021-08-31 2021-08-31 Anti-rainbow-pattern polyester film

Country Status (1)

Country Link
CN (1) CN113698651A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111944411A (en) * 2020-08-17 2020-11-17 江苏三房巷薄膜有限公司 Low-rainbow-pattern polyester optical film coating liquid and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111944411A (en) * 2020-08-17 2020-11-17 江苏三房巷薄膜有限公司 Low-rainbow-pattern polyester optical film coating liquid and preparation method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
瓦茨拉夫•谢迪维奇 等: "《有机溶剂分析手册》", 30 June 1984, 化学工业出版社 *
高占先: "《有机化学实验》", 30 June 2004, 高等教育出版社 *

Similar Documents

Publication Publication Date Title
JP5389568B2 (en) Transparent conductive film
JP2016060158A (en) Release film for producing ceramic sheet
JP7172045B2 (en) Biaxially oriented polyester film roll for transfer material
CN110626029A (en) Purple biaxially oriented polyester film and preparation method thereof
CN113683806A (en) Release film for stacking ceramic blank sheets and preparation method thereof
CN215904093U (en) Anti-rainbow-pattern polyester film and manufacturing equipment thereof
CN113698651A (en) Anti-rainbow-pattern polyester film
JP2001322218A (en) Coextrusion laminated polyester film
KR101805083B1 (en) Colored release film and preparation method thereof
CN215903925U (en) Release film for stacking ceramic blank sheets and manufacturing equipment thereof
JP7144715B2 (en) Release film roll for manufacturing ceramic green sheets
CN113320307B (en) Light blue BOPET (biaxially oriented polyethylene terephthalate) film base for medical thermosensitive films
CN215849785U (en) Pearl-lustre polyester film and manufacturing equipment thereof
JP2017132255A (en) Laminated film and method for producing the same
JP2017132990A (en) Polyester film
JP7456200B2 (en) film roll
CN113682019B (en) Pearlescent polyester film and preparation method thereof
JP2010214627A (en) Laminated polyester film
KR20160093422A (en) High transparent anti-static polyester film and method for manufacturing the same
JP2016210098A (en) Biaxially oriented laminated polyester film for pasting on window
JP7129018B2 (en) Release polyester film
KR101282433B1 (en) Apparatus and method for producing film
WO2019123979A1 (en) Biaxially oriented multilayer film
CN218989141U (en) Multilayer plastic envelope membrane
JP6163867B2 (en) Optical polyester film

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination