CN109943027B - Low-rainbow-grain polyester film and preparation method thereof - Google Patents
Low-rainbow-grain polyester film and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low rainbow texture polyester film and a preparation method thereof, wherein the low rainbow texture polyester film is prepared by melting and mixing a mixture of polyester and a surface modification material, then extruding, casting, stretching longitudinally and transversely and bidirectionally, and heat setting; the polyester is selected from polyester with the intrinsic viscosity of 0.62-0.68 dL/g, the melting point of 255-265 ℃ and the molecular weight of 20000-30000; the surface modification material is a surface modification material with the viscosity of 0.60-0.75 dL/g, and consists of 0.2-10% of nano material and 99.8-90% of copolyester with the molecular weight of 20000-30000 in percentage by mass. The invention has the advantages that: the invention has simple production process, and the prepared low rainbow texture film has good optical property and excellent processing property, and is particularly suitable for conductive films, protective films, release films and the like in the field of various optical display devices.
Description
Technical Field
The invention belongs to the field of polyethylene terephthalate (polyester or PET) films and preparation thereof, and particularly relates to a low-rainbow-pattern polyester film and a preparation method thereof.
Background
With the widespread use of displays in recent years, low rainbow texture polyester films have been used for further improvement of high definition display effects. At present, the control of low-rainbow patterns in the production of polyester films has great difficulty. The core technical problem is the lack of raw materials that can meet the requirements of low rainbow patterns. In the prior art, a layer of high-folding resin is coated on the surface of a polyester film to solve the secondary problem, but the method increases the processing link, greatly influences the quality, has poor low rainbow pattern stability, and has complex production process and increased cost.
Disclosure of Invention
The invention aims to provide a low-rainbow-grain polyester film which can simplify the production process, reduce the cost and ensure the stability of low rainbow grains and a preparation method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: the low rainbow texture polyester film has the innovation points that: the low rainbow texture polyester film is a single layer and is prepared by melting and mixing a mixture of 90-50% of polyester and 10-50% of surface modification material in percentage by mass, extruding, casting, stretching longitudinally and transversely and bidirectionally, and heat setting;
the polyester is selected from polyester with the intrinsic viscosity of 0.62-0.68 dL/g, the melting point of 255-265 ℃ and the molecular weight of 20000-30000;
the surface modification material is a surface modification material with the viscosity of 0.60-0.75 dL/g, and consists of 0.2-10% of nano material and 99.8-90% of copolyester with the molecular weight of 20000-30000 in percentage by mass.
Further, the polyester is one or more of FG600 base material type film grade polyester chips provided by China petrochemical and characterized chemical fiber, Inc., CZ-5011 super bright polyester chips provided by Jiangsu three-rood roadway group, Inc., and TN8065S film grade polyester chips provided by Japan emperor corporation.
Further, the nano material is an inorganic nano material or an organic nano material, and the inorganic nano material is one or more of zirconium dioxide, zinc oxide, magnesium oxide and titanium dioxide; the organic nano material is one or more of polymethyl methacrylate, polycarbonate, alicyclic polyimide, phenyl quinoxaline and benzothiazole hydrosulfuryl ester.
The preparation method of the low rainbow texture polyester film has the innovation points that: the preparation method comprises the following steps:
step 1: preparing nano slurry: at room temperature, 100 parts by mass of 50-2000 nm nano material and 500 parts by mass of ethylene glycol are put into a mixer with ultrahigh-speed stirring and are uniformly stirred to prepare nano slurry for later use;
step 2: preparing a surface modification material: adding 1000 parts by mass of phthalic acid, 370-385 parts by mass of ethylene glycol, 1-1.5 parts by mass of a catalyst and 0.5-1 part by mass of a stabilizer into a reactor, filling nitrogen, carrying out esterification reaction at 230-260 ℃ for 2-3 hours, then finishing the reaction, keeping the temperature of the reactor at 270-290 ℃ under the vacuum degree of 0.08-0.09 MPa, carrying out polycondensation reaction, adding 2.0-111.1 parts by mass of nano slurry when the viscosity of the resin is 0.30-0.40 dL/g, stopping the polycondensation reaction when the viscosity of the resin reaches 0.60-0.75 dL/g, cooling and granulating to obtain a surface modification material with the viscosity of 0.60-0.75 dL/g, the melting point of 250-265 ℃, the carboxyl end content of 15-30 mol/t, the molecular weight of 20000-30000, of 99.8-90% of a copolymer and the nano material of 0.2-10% of the nano material for later use;
and step 3: preparing the low rainbow texture polyester film: feeding a dried mixture of 90-50% of polyester and 10-50% of surface modification material by mass percent into an extruder I, melting at 265-295 ℃, accurately metering by a metering pump according to a set thickness, extruding from a lip die head, casting on a cold drum at 15-50 ℃, entering a longitudinal stretching section with the length of 3-5 m and the temperature of 65-95 ℃ at the speed of 5-70 m/min, stretching by 3.0-3.8 times, cooling to 20-45 ℃ by a cooling section, entering a preheating and transverse drawing box at the speed of 15-266 m/min, preheating at the length of 5-9 m and the temperature of 80-145 ℃, stretching by 3.0-4.5 times at a transverse stretching section with the length of 8-12 m and the temperature of 100-170 ℃, shaping by a heat shaping section with the length of 10-16 m and the temperature of 220-245 ℃, cooling at 30-35 ℃ and at room temperature, and rolling, obtaining the finished product of the polyester film with low rainbow patterns.
Further, the phthalic acid is a mixture of three phthalic acids of terephthalic acid, isophthalic acid and phthalic acid; the catalyst is one or more of antimony acetate, antimony trioxide and ethylene glycol antimony titanium system, and the stabilizer is one or two of trimethyl phosphate and triphenyl phosphate.
The low rainbow texture polyester film has the innovation points that: the polyester composite base film with low rainbow patterns is formed by three layers which are formed by coextrusion and compounding of a film A, a film B and a film C in sequence;
the film A and the film C layer are prepared by melting and mixing a mixture of 80-40% of polyester and 20-60% of surface modification material in percentage by mass, extruding, casting, stretching longitudinally and transversely, and heat setting;
the film B layer is prepared by polyester through melt mixing, extrusion, sheet casting, longitudinal and transverse stretching and heat setting;
the polyester is selected from polyester with the intrinsic viscosity of 0.62-0.68 dL/g, the melting point of 255-265 ℃ and the molecular weight of 20000-30000;
the surface modification material is a surface modification material with the viscosity of 0.60-0.75 dL/g, and consists of 0.2-10% of nano material and 99.8-90% of copolyester with the molecular weight of 20000-30000 in percentage by mass.
Further, the polyester is one or more of FG600 base material type film grade polyester chips provided by China petrochemical and characterized chemical fiber, Inc., CZ-5011 super bright polyester chips provided by Jiangsu three-rood roadway group, Inc., and TN8065S film grade polyester chips provided by Japan emperor corporation.
Further, the nano material is an inorganic nano material or an organic nano material, and the inorganic nano material is one or more of zirconium dioxide, zinc oxide, magnesium oxide and titanium dioxide; the organic nano material is one or more of polymethyl methacrylate, polycarbonate, alicyclic polyimide, phenyl quinoxaline and benzothiazole hydrosulfuryl ester.
The preparation method of the low rainbow texture polyester film has the innovation points that: the preparation method comprises the following steps:
step 1: preparing nano slurry: at room temperature, 100 parts by mass of 50-2000 nm nano material and 500 parts by mass of ethylene glycol are put into a mixer with ultrahigh-speed stirring and are uniformly stirred to prepare nano slurry for later use;
step 2: preparing a surface modification material: preparing a surface modification material: adding 1000 parts by mass of phthalic acid, 370-385 parts by mass of ethylene glycol, 1-1.5 parts by mass of a catalyst and 0.5-1 part by mass of a stabilizer into a reactor, filling nitrogen, carrying out esterification reaction at 230-260 ℃ for 2-3 hours, then finishing the reaction, keeping the temperature of the reactor at 270-290 ℃ under the vacuum degree of 0.08-0.09 MPa, carrying out polycondensation reaction, adding 2.0-111.1 parts by mass of nano slurry when the viscosity of the resin is 0.30-0.40 dL/g, stopping the polycondensation reaction when the viscosity of the resin reaches 0.60-0.75 dL/g, cooling and granulating to obtain a surface modification material with the viscosity of 0.60-0.75 dL/g, the melting point of 250-265 ℃, the carboxyl end content of 15-30 mol/t, the molecular weight of 20000-30000, of 99.8-90% of a copolymer and the nano material of 0.2-10% of the nano material for later use;
and step 3: preparing the low rainbow texture polyester film: respectively feeding the dried mixture of 90-50% by mass of polyester and 10-50% by mass of surface modification material and 100% by mass of polyester into extruders I, II and III, melting at 265-295 ℃, accurately metering by a metering pump according to the set thickness of three layers of a film A layer, a film B layer and a film C layer, co-extruding from three lip die heads sequentially through the up and down sequence of three layers of film A, B, C, casting on a cold drum at 15-40 ℃, feeding the sheet into a longitudinal stretching section with the length of 3-5 m and the temperature of 65-90 ℃ at the speed of 5-70 m/min for 3.0-3.8 times, cooling to 20-45 ℃ through a cooling section, feeding the longitudinally stretched sheet into a preheating and transverse drawing box at the speed of 15-266 m/min, feeding the sheet into a transverse drawing box with the length of 5-9 m and the temperature of 60-120 ℃, then stretching the sheet into a transverse drawing section with the length of 8-12 m and the temperature of 115-170 ℃ for 3.0-4.5 times, and then the polyester film is shaped by a heat setting section with the temperature of 10-16 m and the temperature of 220-245 ℃, and then the polyester film is cooled at two stages of 30-35 ℃ and room temperature and then is rolled to obtain the polyester film finished product with low rainbow patterns.
Further, the phthalic acid is a mixture of three phthalic acids of terephthalic acid, isophthalic acid and phthalic acid; the catalyst is one or more of antimony acetate, antimony trioxide and ethylene glycol antimony titanium system, and the stabilizer is one or two of trimethyl phosphate and triphenyl phosphate.
The invention has the advantages that:
(1) the invention adopts the nano-scale slurry and the copolyester to prepare the surface modification material, and the nano material is agglomerated in the polyester material and is difficult to disperse, thereby laying the foundation of the technology and the core material for directly solving the rainbow patterns of the polyester film;
(2) the invention adopts the technical scheme that the surface modification material prepared from the nano-grade material is used for preparing the polyester film with low rainbow patterns, solves the problems of rainbow patterns and rolling operability, and also plays a role in being used as an opening agent. The nano-scale particles realize the stable and uniform dispersion effect in the copolyester material, thereby ensuring the stability of the opening performance and the surface energy of the copolyester film surface in the processing and using processes;
(3) the low rainbow texture polyester film has the characteristics of good optical performance and reprocessing performance;
(4) the low rainbow texture polyester film product of the invention has simple and convenient preparation process, easy operation, strong practicability and low cost.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Examples
1. Preparing nano slurry:
at room temperature, 100 kg of 50-500 nm nano material and 500 kg of ethylene glycol are put into a mixer with ultrahigh-speed stirring and are uniformly stirred to prepare nano slurry for later use.
The nano material is inorganic nano material or organic nano material, and the inorganic nano material is zirconium dioxide (ZrO)2) Zinc oxide (ZnO), magnesium oxide (MgO), titanium dioxide (TiO)2) The organic nano material is polymethyl methacrylate (abbreviation: PMMA), polycarbonate (PC for short), alicyclic polyimide, phenyl quinoxaline and benzothiazole sulfydryl ester.
Examples of nanopastes the amounts of nanomaterial used for "slurries 01 to 15" are given in table 1 below.
Table 1: the consumption of the nanomaterials in the nanopaste (units: Kg)
2. Preparing a surface modification material:
adding 1000 parts by mass of phthalic acid, 370-385 parts by mass of ethylene glycol, 1-1.5 parts by mass of a catalyst and 0.5-1 part by mass of a stabilizer into a reactor, filling nitrogen, carrying out esterification reaction at 230-260 ℃ for 2-3 hours, then finishing the reaction, keeping the temperature of the reactor at 270-290 ℃ under the condition that the vacuum degree is 0.08-0.09 MPa, carrying out polycondensation reaction, adding 2.0-111 parts by mass of nano slurry when the viscosity of the resin is 0.30-0.40 dL/g, stopping the polycondensation reaction when the viscosity of the resin reaches 0.60-0.75 dL/g, cooling and granulating to obtain a surface modification material with the viscosity of 0.60-0.75 dL/g, the melting point of 250-265 ℃, the terminal carboxyl content of 15-30 mol/t, the molecular weight of 20000-30000, the copolymer of 99.8-90% and the nano material of 0.2-10%, and keeping for later use;
the phthalic acid is a mixture of terephthalic acid, isophthalic acid and phthalic acid;
the catalyst is one or more of antimony acetate, antimony trioxide, ethylene glycol antimony and titanium series;
the stabilizer is one or two of trimethyl phosphate and triphenyl phosphate;
the nano-slurry is one of the above example number slurries 01 to 15.
In Table 2 below, examples 1-1 correspond to the nanopaste made using example slurry 01, examples 1-2 correspond to the nanopaste made using example slurry 02, and so on.
Table 2: examples 1-1 to 1-12 ratios and amounts of materials used to prepare surface-modified materials (units: kg)
3. Preparing a single-layer low-rainbow-grain polyester film:
feeding a dried mixture of 90-50% of polyester and 10-50% of surface modification material by mass percent into an extruder I, melting at 265-295 ℃, accurately metering by a metering pump according to a set thickness of 20-300 mu m, extruding from a lip die head, casting on a cold drum at 15-50 ℃, entering a longitudinal stretching section with the length of 3-5 m and the temperature of 65-95 ℃ at the speed of 5-70 m/min, stretching for 3.0-3.8 times, cooling to 20-45 ℃ by a cooling section, entering a preheating and transverse drawing box at the speed of 15-266 m/min, entering a preheating section with the length of 5-9 m and the temperature of 80-145 ℃, stretching for 3.0-4.5 times by a transverse stretching section with the length of 8-12 m and the temperature of 100-170 ℃, then entering a heat setting section with the length of 10-16 m and the temperature of 220-245 ℃ and then cooling at 30-35 ℃ and room temperature, obtaining a finished product of the polyester film with low rainbow patterns;
the surface-modified material is prepared from the first part of the surface-modified material. In Table 3 below, example 2-1 corresponds to example 1-1, example 2-2 corresponds to the surface modifier prepared in example 1-2, and so on.
Table 3: partial process condition for preparing low rainbow texture polyester base film
Table 4: the thickness of the polyester film prepared in examples 2-1 to 2-15 and the corresponding performance table are as follows:
note: the low rainbow pattern detection method comprises the following steps: the black glass water was filled with a layer of distilled water, the hardened film was adhered to the glass, and the glass was observed in the sun or under irradiation from a D65 lamp, and the following six ratings were recorded. (level 0: no rainbow pattern on the whole surface, level 1: light rainbow pattern on the whole surface, level 2: local serious; level 3: serious overall.)
T/%: light transmittance, which is the percentage of the luminous flux transmitted through a transparent or translucent body to the luminous flux incident thereon;
h/%: haze, which is the percentage of the transmitted light intensity that deviates from the incident light by more than 2.5 ° from the total transmitted light intensity;
c/%: definition, which is the degree of obstruction that occurs when particles in a transparent or translucent body transmit light;
commercial products refer to single layer extruded PET films that exist on the market, having the same purpose. The product A is treated by coating, the product B is optical grade polyester basal membrane, and the product C is common polyester basal membrane.
4. Preparing a three-layer low-rainbow-pattern polyester film:
feeding the dried mixture of 90-50% by mass of polyester and 10-50% by mass of surface modification material and 100% by mass of polyester into extruders I, II and III respectively, melting at 265-295 ℃, accurately metering the thicknesses of three layers of film A layer 1-30 μm, film B layer 18-240 μm and film C layer 1-30 μm by a metering pump, co-extruding the three layers of film A, B, C from top to bottom in sequence from three lip die heads, casting on a cold drum at 15-40 ℃, feeding the cold drum into a longitudinal stretching section with the length of 3-5 m and the temperature of 65-90 ℃ at the speed of 5-70 m/min for 3.0-3.8 times, cooling to 20-45 ℃ by a cooling section, feeding the longitudinally stretched thin blank sheet into a preheating and transverse stretching box at the speed of 15-266 m/min, feeding the cold drum into a preheating box with the length of 5-9 m and the temperature of 60-120 ℃, then stretching the film by 3.0-4.5 times in a transverse stretching section with the length of 8-12 m and the temperature of 115-170 ℃, then shaping the film by a heat shaping section with the length of 10-16 m and the temperature of 220-245 ℃, and then rolling the film after cooling at two stages of 30-35 ℃ and room temperature to obtain a polyester composite base film finished product with low rainbow patterns;
the polyester can be one or more of FG600 base material type film grade polyester chips provided by China petrochemical characterization chemical fiber Limited liability company, CZ-5011 super bright polyester chips provided by Jiangsu three-roon group Limited company and TN8065S film grade polyester chips provided by Japan emperor corporation, and the polyester has the intrinsic viscosity of 0.62-0.68 dL/g, the melting point of 255-265 ℃ and the molecular weight of 20000-30000;
the surface modification material is prepared from the surface modification material. In Table 5 below, example 2-1 corresponds to example 1-1, example 2-2 corresponds to the surface modifier prepared in example 1-2, and so on.
Table 5: partial process condition for preparing low rainbow texture polyester composite base film
Table 6: examples 3-1 to 3-15 preparation of polyester base films with low rainbow texture and the corresponding performance tables:
note: the low rainbow pattern detection method comprises the following steps: the black glass water was filled with a layer of distilled water, the hardened film was adhered to the glass, and the glass was observed in the sun or under irradiation from a D65 lamp, and the following six ratings were recorded. (level 0: no rainbow pattern on the whole surface, level 1: light rainbow pattern on the whole surface, level 2: local serious; level 3: serious overall.)
T/%: light transmittance, which is the percentage of the luminous flux transmitted through a transparent or translucent body to the luminous flux incident thereon;
h/%: haze, which is the percentage of the transmitted light intensity that deviates from the incident light by more than 2.5 ° from the total transmitted light intensity;
c/%: definition, which is the degree of obstruction that occurs when particles in a transparent or translucent body transmit light;
the market product refers to a multilayer co-extruded PET film which exists in the market and has the same purpose, the market product D is treated by a coating, the market product E is an optical-grade polyester base film, and the market product F is a common polyester base film.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A low rainbow line polyester film is characterized in that: the low rainbow texture polyester film is a single layer and is prepared by melting and mixing a mixture of 90-50% of polyester and 10-50% of surface modification material in percentage by mass, extruding, casting, stretching longitudinally and transversely and bidirectionally, and heat setting;
the polyester is selected from polyester with the intrinsic viscosity of 0.62-0.68 dL/g, the melting point of 255-265 ℃ and the molecular weight of 20000-30000;
the surface modification material is a surface modification material with the viscosity of 0.60-0.75 dL/g, and consists of 0.2-10% of nano material and 99.8-90% of copolyester with the molecular weight of 20000-30000 in percentage by mass;
the nano material is one or more of polymethyl methacrylate, polycarbonate, alicyclic polyimide, phenyl quinoxaline and benzothiazole sulfydryl ester.
2. The low rainbow texture polyester film of claim 1, wherein: the polyester is one or more of FG600 base material type film grade polyester chips provided by China petrochemical industry characterized chemical fiber Limited liability company, CZ-5011 super bright polyester chips provided by Jiangsu three-roon roadway group Limited company and TN8065S film grade polyester chips provided by Japan emperor corporation.
3. A method for preparing the polyester film with low rainbow texture of claim 1, which is characterized in that: the preparation method comprises the following steps:
step 1: preparing nano slurry: at room temperature, 100 parts by mass of 50-2000 nm nano material and 500 parts by mass of ethylene glycol are put into a mixer with ultrahigh-speed stirring and are uniformly stirred to prepare nano slurry for later use;
step 2: preparing a surface modification material: adding 1000 parts by mass of phthalic acid, 370-385 parts by mass of ethylene glycol, 1-1.5 parts by mass of a catalyst and 0.5-1 part by mass of a stabilizer into a reactor, filling nitrogen, carrying out esterification reaction at 230-260 ℃ for 2-3 hours, then finishing the reaction, keeping the temperature of the reactor at 270-290 ℃ under the vacuum degree of 0.08-0.09 MPa, carrying out polycondensation reaction, adding 2.0-111.1 parts by mass of nano slurry when the viscosity of the resin is 0.30-0.40 dL/g, stopping the polycondensation reaction when the viscosity of the resin reaches 0.60-0.75 dL/g, cooling and granulating to obtain a surface modification material with the viscosity of 0.60-0.75 dL/g, the melting point of 250-265 ℃, the carboxyl end content of 15-30 mol/t, the molecular weight of 20000-30000, of 99.8-90% of a copolymer and the nano material of 0.2-10% of the nano material for later use;
and step 3: preparing the low rainbow texture polyester film: feeding a dried mixture of 90-50% of polyester and 10-50% of surface modification material by mass percent into an extruder I, melting at 265-295 ℃, accurately metering by a metering pump according to a set thickness, extruding from a lip die head, casting on a cold drum at 15-50 ℃, entering a longitudinal stretching section with the length of 3-5 m and the temperature of 65-95 ℃ at the speed of 5-70 m/min, stretching by 3.0-3.8 times, cooling to 20-45 ℃ by a cooling section, entering a preheating and transverse drawing box at the speed of 15-266 m/min, preheating at the length of 5-9 m and the temperature of 80-145 ℃, stretching by 3.0-4.5 times at a transverse stretching section with the length of 8-12 m and the temperature of 100-170 ℃, shaping by a heat shaping section with the length of 10-16 m and the temperature of 220-245 ℃, cooling at 30-35 ℃ and at room temperature, and rolling, obtaining the finished product of the polyester film with low rainbow patterns.
4. The method for preparing a polyester film with low rainbow texture as claimed in claim 3, wherein: the phthalic acid is a mixture of terephthalic acid, isophthalic acid and phthalic acid; the catalyst is one or more of antimony acetate, antimony trioxide and ethylene glycol antimony titanium system, and the stabilizer is one or two of trimethyl phosphate and triphenyl phosphate.
5. A low rainbow line polyester film is characterized in that: the polyester composite base film with low rainbow patterns is formed by three layers which are formed by coextrusion and compounding of a film A, a film B and a film C in sequence;
the film A and the film C layer are prepared by melting and mixing a mixture of 80-40% of polyester and 20-60% of surface modification material in percentage by mass, extruding, casting, stretching longitudinally and transversely, and heat setting;
the film B layer is prepared by polyester through melt mixing, extrusion, sheet casting, longitudinal and transverse stretching and heat setting;
the polyester is selected from polyester with the intrinsic viscosity of 0.62-0.68 dL/g, the melting point of 255-265 ℃ and the molecular weight of 20000-30000;
the surface modification material is a surface modification material with the viscosity of 0.60-0.75 dL/g, and consists of 0.2-10% of nano material and 99.8-90% of copolyester with the molecular weight of 20000-30000 in percentage by mass;
the nano material is one or more of polymethyl methacrylate, polycarbonate, alicyclic polyimide, phenyl quinoxaline and benzothiazole sulfydryl ester.
6. A method for preparing the polyester film with low rainbow veins of claim 5, which is characterized in that: the preparation method comprises the following steps:
step 1: preparing nano slurry: at room temperature, 100 parts by mass of 50-2000 nm nano material and 500 parts by mass of ethylene glycol are put into a mixer with ultrahigh-speed stirring and are uniformly stirred to prepare nano slurry for later use;
step 2: preparing a surface modification material: preparing a surface modification material: adding 1000 parts by mass of phthalic acid, 370-385 parts by mass of ethylene glycol, 1-1.5 parts by mass of a catalyst and 0.5-1 part by mass of a stabilizer into a reactor, filling nitrogen, carrying out esterification reaction at 230-260 ℃ for 2-3 hours, then finishing the reaction, keeping the temperature of the reactor at 270-290 ℃ under the vacuum degree of 0.08-0.09 MPa, carrying out polycondensation reaction, adding 2.0-111.1 parts by mass of nano slurry when the viscosity of the resin is 0.30-0.40 dL/g, stopping the polycondensation reaction when the viscosity of the resin reaches 0.60-0.75 dL/g, cooling and granulating to obtain a surface modification material with the viscosity of 0.60-0.75 dL/g, the melting point of 250-265 ℃, the carboxyl end content of 15-30 mol/t, the molecular weight of 20000-30000, of 99.8-90% of a copolymer and the nano material of 0.2-10% of the nano material for later use;
and step 3: preparing the low rainbow texture polyester film: respectively feeding the dried mixture of 90-50% by mass of polyester and 10-50% by mass of surface modification material and 100% by mass of polyester into extruders I, II and III, melting at 265-295 ℃, accurately metering by a metering pump according to the set thickness of three layers of a film A layer, a film B layer and a film C layer, co-extruding from three lip die heads sequentially through the up and down sequence of three layers of film A, B, C, casting on a cold drum at 15-40 ℃, feeding the sheet into a longitudinal stretching section with the length of 3-5 m and the temperature of 65-90 ℃ at the speed of 5-70 m/min for 3.0-3.8 times, cooling to 20-45 ℃ through a cooling section, feeding the longitudinally stretched sheet into a preheating and transverse drawing box at the speed of 15-266 m/min, feeding the sheet into a transverse drawing box with the length of 5-9 m and the temperature of 60-120 ℃, then stretching the sheet into a transverse drawing section with the length of 8-12 m and the temperature of 115-170 ℃ for 3.0-4.5 times, and then the polyester film is shaped by a heat setting section with the temperature of 10-16 m and the temperature of 220-245 ℃, and then the polyester film is cooled at two stages of 30-35 ℃ and room temperature and then is rolled to obtain the polyester film finished product with low rainbow patterns.
7. The method for preparing polyester film with low rainbow texture as claimed in claim 6, wherein: the phthalic acid is a mixture of terephthalic acid, isophthalic acid and phthalic acid; the catalyst is one or more of antimony acetate, antimony trioxide and ethylene glycol antimony titanium system, and the stabilizer is one or two of trimethyl phosphate and triphenyl phosphate.
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| CN107915960A (en) * | 2017-11-17 | 2018-04-17 | 江苏东材新材料有限责任公司 | A kind of ultra low surface roughness polyester base film/compound substrate membranes and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107915960A (en) * | 2017-11-17 | 2018-04-17 | 江苏东材新材料有限责任公司 | A kind of ultra low surface roughness polyester base film/compound substrate membranes and preparation method thereof |
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