CN110920187A - Low-friction low-temperature heat-sealing BOPET film and preparation method thereof - Google Patents
Low-friction low-temperature heat-sealing BOPET film and preparation method thereof Download PDFInfo
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- 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
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- 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
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
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- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
- C08K7/20—Glass
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Abstract
The invention discloses a low-friction low-temperature heat-sealing BOPET film and a preparation method thereof, the film consists of an upper surface layer, a core layer and a lower surface layer, the lower surface layer is a low-temperature heat-sealing layer, the raw material of the film is a copolymerization modified PETG polyester heat-sealing master batch, and the film is obtained by copolymerizing terephthalic acid, ethylene glycol, neopentyl glycol and oxalic acid, wherein the molar ratio of the terephthalic acid, the ethylene glycol, the neopentyl glycol and the oxalic acid is (40-45): (40-45): (5-10): (5-10); the upper surface layer is an anti-sticking layer and is prepared from the following raw materials in percentage by weight: 40-50% of bright polyester chips, 5-10% of smooth master batch and 40-50% of anti-sticking master batch; the core layer is made of polyester chip with bright color. The low-friction low-temperature heat-sealing BOPET film prepared by the invention has stable performance and good low-temperature heat-sealing performance, and simultaneously, the application field of the expanded BOPET heat-sealing film reduces the heat-sealing energy consumption.
Description
Technical Field
The invention relates to the technical field of films, in particular to a low-friction low-temperature heat-sealing BOPET film and a preparation method thereof.
Background
The BOPET film is a packaging film with relatively comprehensive performance. The transparency is good and the gloss is good; has good air tightness and fragrance retention. The film has excellent mechanical performance, the toughness is the best of all thermoplastics, and the tensile strength and the impact strength are much higher than those of the common film; and the product has good stiffness and stable size, and is suitable for secondary processing of printing, paper bags and the like. The BOPET film also has excellent heat resistance, cold resistance and good chemical resistance and oil resistance.
In recent years, the BOPET film industry in China is rapidly developed, the application field of the industry market is continuously expanded, the specialization degree of products is higher and higher, and the step of import substitution is accelerated. Industry enterprises increase investment in product innovation and technical improvement, product quality is further improved in the fields of packaging and industry, application is further expanded in the fields of special packaging, electronics, precision coating, photoelectricity, aviation, building, agriculture and the like, and the industry gradually forms a differentiated, specialized and high-end product supply mode.
The BOPET film has excellent comprehensive performance and also has some defects: conventional BOPET films cannot be heat sealed directly. For use in heat sealing applications, it usually requires complex and expensive compounding procedures with other resins, greatly limiting its application. Because the common BOPET film does not have the heat sealing performance, the method of compounding the BOPET and the CPP or PE film has to be adopted to solve the problem of package sealing. For example, the composite mode of BOPET/adhesive/CPP or BOPET/adhesive/PE or BOPET/AL/adhesive/CPP is adopted, so that the packaging cost is greatly increased, and the sanitation of packaged food is influenced and the health of people is influenced due to the existence of residual solvent during the composite. Therefore, BOPET heat-sealing films are produced at the same time and are rapidly applied in the fields of packaging, building, electronics and the like. However, with the development trend of high speed and automation in the packaging industry, the BOPET heat sealing film still needs to have the performance of low-temperature instantaneous heat sealing and excellent heat sealing strength, and meanwhile, in order to meet the requirement of high-speed packaging of different types of packaging machines, the film friction coefficient is also required to be lower. At present, the initial heat sealing temperature of the domestic common BOPET heat sealing film is about 95 ℃, and the friction coefficient is between 0.4 and 0.5. In order to keep pace with the high-speed step of the packaging industry, the invention aims to develop the low-friction low-temperature heat-sealing BOPET film.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a low-friction low-temperature heat-sealing BOPET film and a preparation method thereof.
The invention provides a low-friction low-temperature heat-sealing BOPET film which is composed of an upper surface layer, a core layer and a lower surface layer, and is characterized in that the lower surface layer is a low-temperature heat-sealing layer, the raw material is copolymerization modified PETG polyester heat-sealing master batch, and the low-friction low-temperature heat-sealing BOPET film is obtained by copolymerizing terephthalic acid, ethylene glycol, neopentyl glycol and oxalic acid, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the neopentyl glycol to the oxalic acid is (40-45): (40-45): (5-10): (5-10).
Preferably, the upper surface layer is an anti-sticking layer and is prepared from the following raw materials in percentage by weight: 40-50% of bright polyester chips, 5-10% of smooth master batch and 40-50% of anti-sticking master batch.
Preferably, the smooth master batch comprises the following raw materials in percentage by weight: 2-4% of pentaerythritol stearate and the balance of super bright polyester chips.
Preferably, the anti-sticking master batch comprises the following raw materials in percentage by weight: 4-6% of spherical transparent glass beads and the balance of bright polyester chips; preferably, the spherical transparent glass beads have a particle size of 2.0 to 2.5 μm.
Preferably, the raw material of the core layer is a large bright polyester chip.
Preferably, the thickness of the upper surface layer accounts for 12-15% of the total thickness of the film, and the thickness of the lower surface layer accounts for 15-20% of the total thickness of the film.
The preparation method of the low-friction low-temperature heat-sealing BOPET film comprises the following steps:
s1, respectively melting and extruding the raw material of the core layer, the raw material of the upper surface layer and the raw material of the lower surface layer to obtain a core layer melt, an upper surface layer melt and a lower surface layer melt; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer structure die head to obtain a membrane, wherein the converging and extruding temperature is 270-275 ℃;
s2, cooling the membrane by a cold roll to form a cast sheet, wherein the cooling temperature is 25-30 ℃;
s3, preheating the cast sheet and then longitudinally stretching the cast sheet, wherein the preheating temperature is 60-95 ℃, the stretching temperature is 100-110 ℃, and the stretching ratio is 3.0-3.5 times;
s4, preheating the film obtained after the longitudinal stretching in the step S3, then transversely stretching the film, wherein the preheating temperature is 80-90 ℃, the stretching temperature is 100-110 ℃, then shaping the film at the temperature of 180-230 ℃, and cooling the film at the temperature of 23-27 ℃ to obtain the low-friction low-temperature heat-sealing BOPET film.
Preferably, in the step S1, the melt extrusion temperature of the raw material of the lower surface layer is 245-.
The invention has the beneficial effects that the anti-sticking master batch with the spherical transparent glass microspheres with the particle size of 2.0-2.5 mu m as the effective component is adopted, the appearance quality of the film surface is improved, the flatness of the film surface is improved and the optical performance of the film is improved under the condition of ensuring normal rolling; the smooth master batch with the effective component of pentaerythritol stearate is adopted, so that the friction coefficient of the film can be effectively reduced, the problems of film surface scratch, adhesion, large static electricity and the like caused by large surface friction are solved, and the processing performance of the film is improved; the copolymerization modified PETG polyester heat-sealing master batch obtained by copolymerizing terephthalic acid, ethylene glycol, neopentyl glycol and oxalic acid in a proper proportion is used as the raw material of the lower surface layer, compared with the common heat-sealing master batch, the glass transition temperature is reduced by 10-15 ℃, the initial heat-sealing temperature of the film can be effectively reduced, the initial heat-sealing temperature of the common heat-sealing film is about 95 ℃, the initial heat-sealing temperature of the film is about 85 ℃, and the heat-sealing strength reaches more than 2.5N/15 mm. The low-friction low-temperature heat-sealing BOPET film prepared by the invention has stable performance and good low-temperature heat-sealing performance, simultaneously expands the application field of the BOPET heat-sealing film and reduces the heat-sealing energy consumption.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A low-friction low-temperature heat-sealing BOPET film comprises an upper surface layer, a core layer and a lower surface layer.
The upper surface layer is an anti-sticking layer and consists of the following raw materials in percentage by weight: 45% of bright polyester chips, 5% of smooth master batch and 50% of anti-sticking master batch. The smooth master batch comprises the following raw materials in percentage by weight: 2% of pentaerythritol stearate and the balance of super bright polyester chips. The anti-sticking master batch comprises the following raw materials in percentage by weight: 4% of spherical transparent glass beads and the balance of bright polyester chips; the grain diameter of the spherical transparent glass bead is 2.0-2.5 μm.
The core layer is made of polyester chip with bright color.
The lower surface layer is a low-temperature heat sealing layer, the raw material is copolymerization modified PETG polyester heat sealing master batch, and the PETG polyester heat sealing master batch is obtained by copolymerizing terephthalic acid, glycol, neopentyl glycol and oxalic acid, wherein the molar ratio of the terephthalic acid to the glycol to the neopentyl glycol to the oxalic acid is 40: 40: 10: 10.
the thickness of the upper surface layer accounts for 12% of the total thickness of the film, and the thickness of the lower surface layer accounts for 15% of the total thickness of the film.
The preparation method comprises the following steps:
s1, drying the raw material of the core layer by a fluidized bed at 140 ℃ for 4h, heating and melting in a single-screw extruder, filtering by a 20-micron disc filter, and obtaining a core layer melt, wherein the water content of the core layer melt is less than or equal to 50ppm after filtering; respectively adding the raw material of the upper surface layer and the raw material of the lower surface layer into two double-screw extruders for melting and vacuumizing, and removing oligomers, water and impurities in the raw materials to obtain an upper surface layer melt and a lower surface layer melt, wherein the temperature of the double-screw extruders for the raw materials of the lower surface layer is 245 ℃; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer structure die head to obtain a membrane, wherein the converging and extruding temperature is 270 ℃;
s2, attaching the membrane to a chill roll by electrostatic adsorption to be quenched to form a cast piece, wherein the quenching temperature of the cast piece is 25 ℃;
s3, preheating the cast sheet, and then longitudinally stretching the cast sheet, wherein the preheating temperature is 60 ℃, the stretching temperature is 100 ℃, and the stretching ratio is 3.0 times;
and S4, preheating the film obtained after the longitudinal stretching in the step S3, transversely stretching the film, wherein the preheating temperature is 80 ℃, the stretching temperature is 100 ℃, then shaping the film at 180 ℃, and cooling the film at 23 ℃ to obtain the low-friction low-temperature heat-sealing BOPET film.
Example 2
A low-friction low-temperature heat-sealing BOPET film comprises an upper surface layer, a core layer and a lower surface layer.
The upper surface layer is an anti-sticking layer and consists of the following raw materials in percentage by weight: 40% of bright polyester chips, 10% of smooth master batch and 50% of anti-sticking master batch. The smooth master batch comprises the following raw materials in percentage by weight: 3% of pentaerythritol stearate and the balance of super bright polyester chips. The anti-sticking master batch comprises the following raw materials in percentage by weight: 5% of spherical transparent glass beads and the balance of bright polyester chips; the grain diameter of the spherical transparent glass bead is 2.0-2.5 μm.
The core layer is made of polyester chip with bright color.
The lower surface layer is a low-temperature heat sealing layer, the raw material is copolymerization modified PETG polyester heat sealing master batch, and the PETG polyester heat sealing master batch is obtained by copolymerizing terephthalic acid, glycol, neopentyl glycol and oxalic acid, wherein the molar ratio of the terephthalic acid to the glycol to the neopentyl glycol to the oxalic acid is 40: 45: 10: 5.
the thickness of the upper surface layer accounts for 14% of the total thickness of the film, and the thickness of the lower surface layer accounts for 18% of the total thickness of the film.
The preparation method comprises the following steps:
s1, drying the raw material of the core layer by a fluidized bed at 160 ℃ for 5h, heating and melting the raw material in a single-screw extruder, filtering the raw material by a 20-micron disc filter, and obtaining a core layer melt, wherein the water content of the core layer melt is less than or equal to 50ppm after filtering; respectively adding the raw material of the upper surface layer and the raw material of the lower surface layer into two double-screw extruders for melting and vacuumizing, and removing oligomers, water and impurities in the raw materials to obtain an upper surface layer melt and a lower surface layer melt, wherein the temperature of the double-screw extruders for the raw materials of the lower surface layer is 260 ℃; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer structure die head to obtain a membrane, wherein the converging and extruding temperature is 275 ℃;
s2, attaching the membrane to a chill roll by electrostatic adsorption to be quenched to form a cast piece, wherein the quenching temperature of the cast piece is 30 ℃;
s3, preheating the cast sheet, and then longitudinally stretching the cast sheet, wherein the preheating temperature is 95 ℃, the stretching temperature is 110 ℃, and the stretching ratio is 3.5 times;
and S4, preheating the film obtained after the longitudinal stretching in the step S3, transversely stretching the film at the preheating temperature of 90 ℃ and the stretching temperature of 110 ℃, shaping the film at the temperature of 230 ℃, and cooling the film at the temperature of 25 ℃ to obtain the low-friction low-temperature heat-sealing BOPET film.
Example 3
A low-friction low-temperature heat-sealing BOPET film comprises an upper surface layer, a core layer and a lower surface layer.
The upper surface layer is an anti-sticking layer and consists of the following raw materials in percentage by weight: 50% of bright polyester chips, 10% of smooth master batch and 40% of anti-sticking master batch. The smooth master batch comprises the following raw materials in percentage by weight: pentaerythritol stearate 4%, and the balance of super bright polyester chips. The anti-sticking master batch comprises the following raw materials in percentage by weight: 6 percent of spherical transparent glass beads and the balance of bright polyester chips; the grain diameter of the spherical transparent glass bead is 2.0-2.5 μm.
The core layer is made of polyester chip with bright color.
The lower surface layer is a low-temperature heat sealing layer, the raw material is copolymerization modified PETG polyester heat sealing master batch, and the PETG polyester heat sealing master batch is obtained by copolymerizing terephthalic acid, ethylene glycol, neopentyl glycol and oxalic acid, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the neopentyl glycol to the oxalic acid is 45: 45: 5: 5.
the thickness of the upper surface layer accounts for 15% of the total thickness of the film, and the thickness of the lower surface layer accounts for 20% of the total thickness of the film.
The preparation method comprises the following steps:
s1, drying the raw material of the core layer by a fluidized bed at the drying temperature of 150 ℃ for 4.5 hours, heating and melting the raw material in a single-screw extruder, filtering the raw material by a 20-micron disc filter, and obtaining a core layer melt, wherein the water content of the filtered raw material is less than or equal to 50 ppm; respectively adding the raw material of the upper surface layer and the raw material of the lower surface layer into two double-screw extruders for melting and vacuumizing, and removing oligomers, water and impurities in the raw materials to obtain an upper surface layer melt and a lower surface layer melt, wherein the temperature of the double-screw extruders for the raw materials of the lower surface layer is 250 ℃; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer structure die head to obtain a membrane, wherein the converging and extruding temperature is 272 ℃;
s2, attaching the membrane to a chill roll by electrostatic adsorption to be quenched to form a cast piece, wherein the quenching temperature of the cast piece is 28 ℃;
s3, preheating the cast sheet, and then longitudinally stretching the cast sheet, wherein the preheating temperature is 70 ℃, the stretching temperature is 105 ℃, and the stretching ratio is 3.2 times;
and S4, preheating the film obtained after the longitudinal stretching in the step S3, transversely stretching the film at the preheating temperature of 85 ℃ and the stretching temperature of 105 ℃, shaping the film at the temperature of 200 ℃, and cooling the film at the temperature of 27 ℃ to obtain the low-friction low-temperature heat-sealing BOPET film.
Comparative example 1
A heat-sealing BOPET film comprises an upper surface layer, a core layer and a lower surface layer.
The upper surface layer is an anti-sticking layer and consists of the following raw materials in percentage by weight: 50% of bright polyester chips and the balance of common anti-sticking master batch. The core layer is made of polyester chip with bright color. The raw material of the lower surface layer is common heat-sealing master batch.
The thickness of the upper surface layer accounts for 15% of the total thickness of the film, and the thickness of the lower surface layer accounts for 20% of the total thickness of the film.
The preparation method comprises the following steps:
s1, drying the raw material of the core layer by a fluidized bed at the drying temperature of 150 ℃ for 4.5 hours, heating and melting the raw material in a single-screw extruder, filtering the raw material by a 20-micron disc filter, and obtaining a core layer melt, wherein the water content of the filtered raw material is less than or equal to 50 ppm; respectively adding the raw material of the upper surface layer and the raw material of the lower surface layer into two double-screw extruders for melting and vacuumizing, and removing oligomers, water and impurities in the raw materials to obtain an upper surface layer melt and a lower surface layer melt, wherein the temperature of the double-screw extruders for the raw materials of the lower surface layer is 250 ℃; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer structure die head to obtain a membrane, wherein the converging and extruding temperature is 272 ℃;
s2, attaching the membrane to a chill roll by electrostatic adsorption to be quenched to form a cast piece, wherein the quenching temperature of the cast piece is 28 ℃;
s3, preheating the cast sheet, and then longitudinally stretching the cast sheet, wherein the preheating temperature is 70 ℃, the stretching temperature is 105 ℃, and the stretching ratio is 3.2 times;
s4, preheating the film obtained after the longitudinal stretching in the step S3, then transversely stretching the film, wherein the preheating temperature is 85 ℃, the stretching temperature is 105 ℃, then shaping the film at 200 ℃, and cooling the film at 27 ℃ to obtain the film.
The samples obtained in examples 1 to 3 and comparative example 1 were subjected to comparative tests, and the results are shown in Table 1:
TABLE 1 Main physical Properties indexes of examples 1 to 3 and comparative example 1
As shown in Table 1, the modified copolymerized PETG heat-sealing master batch is used, the glass transition temperature of the heat-sealing master batch is effectively reduced, the initial heat-sealing temperature is reduced by about 10 ℃ compared with that of a common heat-sealing film, the heat-sealing strength is superior to that of the common heat-sealing film, in addition, the special anti-adhesion master batch and the smooth master batch are added, the film friction coefficient is reduced to about 0.15, the production efficiency of downstream quick packaging and bag making of the BOPET heat-sealing film is improved, the heat-sealing energy consumption is reduced, and the energy-saving and environment-.
The film disclosed by the invention has the advantages that on the premise of meeting the requirements of mother roll and finished product rolling, the flatness of the film surface is improved, the scratch of the film surface is reduced, the film static electricity caused by friction is reduced, the optical performance of the film is improved, and the application of the BOPET heat sealing film in the field of buildings is expanded.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A low-friction low-temperature heat-sealing BOPET film is composed of an upper surface layer, a core layer and a lower surface layer, and is characterized in that the lower surface layer is a low-temperature heat-sealing layer, the raw material is copolymerization modified PETG polyester heat-sealing master batch, and the master batch is obtained by copolymerizing terephthalic acid, ethylene glycol, neopentyl glycol and oxalic acid, wherein the molar ratio of the terephthalic acid to the ethylene glycol to the neopentyl glycol to the oxalic acid is (40-45): (40-45): (5-10): (5-10).
2. The low-friction low-temperature heat-seal BOPET film as claimed in claim 1, wherein the upper surface layer is an anti-sticking layer and is prepared from the following raw materials in percentage by weight: 40-50% of bright polyester chips, 5-10% of smooth master batch and 40-50% of anti-sticking master batch.
3. The low-friction low-temperature heat-seal BOPET film as claimed in claim 2, wherein the smooth master batch comprises the following raw materials in percentage by weight: 2-4% of pentaerythritol stearate and the balance of super bright polyester chips.
4. The low-friction low-temperature heat-seal BOPET film according to claim 2 or 3, wherein the anti-adhesion master batch comprises the following raw materials in percentage by weight: 4-6% of spherical transparent glass beads and the balance of bright polyester chips; preferably, the spherical transparent glass beads have a particle size of 2.0 to 2.5 μm.
5. The low-friction low-temperature heat-seal BOPET film as claimed in any one of claims 1 to 4, wherein the raw material of the core layer is a large glossy polyester chip.
6. The low-friction low-temperature heat-seal BOPET film according to any one of claims 1 to 5, wherein the thickness of the upper surface layer accounts for 12 to 15 percent of the total thickness of the film, and the thickness of the lower surface layer accounts for 15 to 20 percent of the total thickness of the film.
7. A method for preparing a low-friction low-temperature heat-sealable BOPET film as claimed in any one of claims 1 to 6, comprising the steps of:
s1, respectively melting and extruding the raw material of the core layer, the raw material of the upper surface layer and the raw material of the lower surface layer to obtain a core layer melt, an upper surface layer melt and a lower surface layer melt; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer structure die head to obtain a membrane, wherein the converging and extruding temperature is 270-275 ℃;
s2, cooling the membrane by a cold roll to form a cast sheet, wherein the cooling temperature is 25-30 ℃;
s3, preheating the cast sheet and then longitudinally stretching the cast sheet, wherein the preheating temperature is 60-95 ℃, the stretching temperature is 100-110 ℃, and the stretching ratio is 3.0-3.5 times;
s4, preheating the film obtained after the longitudinal stretching in the step S3, then transversely stretching the film, wherein the preheating temperature is 80-90 ℃, the stretching temperature is 100-110 ℃, then shaping the film at the temperature of 180-230 ℃, and cooling the film at the temperature of 23-27 ℃ to obtain the low-friction low-temperature heat-sealing BOPET film.
8. The method as claimed in claim 7, wherein the melt extrusion temperature of the raw material of the lower surface layer in step S1 is 245-260 ℃.
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Cited By (4)
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| CN111634088A (en) * | 2020-05-07 | 2020-09-08 | 安徽国风塑业股份有限公司 | High-transparency antistatic BOPET release base film and preparation method thereof |
| CN111703161A (en) * | 2020-05-07 | 2020-09-25 | 安徽国风塑业股份有限公司 | High-wear-resistance BOPET film and preparation method thereof |
| CN113415057A (en) * | 2021-06-22 | 2021-09-21 | 安徽国风塑业股份有限公司 | BOPET film for lighting tiles and preparation method thereof |
| CN116442616A (en) * | 2023-03-13 | 2023-07-18 | 广东宝佳利新材料股份有限公司 | BOPET film for ultrathin packaging and preparation method thereof |
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