CN111393702A - Preparation method of high-temperature-resistant electrically-insulated BOPET (biaxially oriented polyethylene terephthalate) film - Google Patents
Preparation method of high-temperature-resistant electrically-insulated BOPET (biaxially oriented polyethylene terephthalate) film Download PDFInfo
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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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—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
- 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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- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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Abstract
The invention relates to the technical field of biaxially oriented film preparation, and discloses a preparation method of a high-temperature-resistant electrically-insulated BOPET biaxially oriented film, which comprises the following steps: s1, mixing ingredients, and preparing quantitative polyethylene terephthalate resin, an antibacterial agent, a heat stabilizer and an additive; s2, crystallizing and drying, namely preparing a packed tower with a crystallization bed, enabling the packed tower to be provided with an air compressor, a molecular sieve dehumidifier and a heater, and putting the polyethylene terephthalate resin into the packed tower for continuous drying, so that the moisture content of the polyethylene terephthalate resin is below 50 ppm. The preparation method of the high-temperature-resistant electrically-insulated BOPET biaxially oriented film has the advantage that the plastic film has excellent high-temperature-resistant electrically-insulated protective performance, and the BOPET biaxially oriented film is not suitable for use in certain specific packaging fields due to large static electricity on the film surface, so that the BOPET biaxially oriented film has a large limitation problem in practical use.
Description
Technical Field
The invention relates to the technical field of biaxially oriented film preparation, in particular to a preparation method of a high-temperature-resistant electrically-insulated BOPET biaxially oriented film.
Background
The BOPET film is a biaxially oriented polyester film. The BOPET film has the characteristics of high strength, good rigidity, transparency, high glossiness and the like; the BOPET film has the advantages of no smell, no color, no toxicity, outstanding toughness and wide application in the field of packaging due to good performance.
At present, the main production mode of domestic PET antistatic films is coating type, namely antistatic liquid is coated on the surfaces of the films, and the method has the problems of environmental pollution, quick decline of antistatic effect and the like; a few manufacturers also produce the PET antistatic film in an internal mixing mode, but due to the problems of raw material formulas and production processes, the haze of the film is large, so that the BOPET biaxially oriented film is not suitable for use in certain specific packaging fields due to large static electricity on the film surface, and does not have good high-temperature resistance and gas insulation resistance, so that the BOPET biaxially oriented film is greatly limited in practical use.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of a high-temperature-resistant electrically-insulated BOPET (biaxially oriented polyethylene terephthalate) film, which has the advantage that a plastic film has excellent high-temperature-resistant electrically-insulated protective performance, and solves the problem that the BOPET film is not suitable for use in certain specific packaging fields due to large film surface static electricity and does not have good high-temperature-resistant electrically-insulated performance, so that the BOPET film is greatly limited in actual use.
(II) technical scheme
In order to realize the purpose of enabling the plastic film to have excellent high-temperature-resistant electric insulation protection performance, the invention provides the following technical scheme: a preparation method of a high-temperature-resistant and electrically-insulated BOPET biaxially oriented film comprises the following steps:
s1, mixing ingredients
Preparing quantitative polyethylene terephthalate resin, an antibacterial agent, a heat stabilizer and an additive;
s2, crystallizing and drying
Preparing a packed tower with a crystallization bed, enabling the packed tower to be provided with an air compressor, a molecular sieve dehumidifier and a heater, and putting the polyethylene terephthalate resin into the packed tower for continuous drying to enable the moisture content of the polyethylene terephthalate resin to be below 50 ppm;
s3. melt extrusion
Feeding the polyethylene terephthalate resin subjected to crystallization and drying treatment in the S2 into a single-screw extruder for melting and plasticizing, then performing coarse filtration operation on the melted and plasticized material through a coarse filter through a melt pipeline, stably conveying the material into a fine filter through a melt metering pump for filtering, homogenizing the melt temperature of the filtered material through a static mixer, and then feeding an antibacterial agent, a heat stabilizer and an additive into the single-screw extruder to obtain a melt;
s4, cooling cast sheet
Feeding the two molten materials in the step S3 into a die head to enable the melt to flow out in a viscous state, and rapidly cooling the flowing melt through a casting sheet roller to enable the melt to form a glass-state casting sheet with uniform thickness for later use;
s5, longitudinal stretching
Placing the cast piece obtained in the step S4 into a longitudinal stretching machine, and performing longitudinal stretching in a heated state;
s6, transversely stretching
Putting the longitudinally stretched cast sheet into a transverse stretcher again, and performing transverse stretching in a heating state to obtain a biaxially oriented film;
s7, final treatment
The film obtained in the S6 is firstly subjected to film thickness detection through a thickness gauge, then corona discharge is generated on an electrode through a corona processor, the surface of the plastic film is impacted under the action of a strong electric field, the surface of the film is activated, the surface moisture tension of the film is increased, effective static electricity removing operation is performed, then the film is wound through a film winding machine, and after the winding is completed, the plastic film is cut through a part to ensure that a cutting machine finished product is formed, and the manufacturing of the film is completed.
Preferably, in the step S4, cooling water at 30 ℃ is introduced into the casting sheet roller to ensure that the casting sheet is cooled to below 60 ℃.
Preferably, the antibacterial agent is a nano magnesium oxide antibacterial agent.
Preferably, the heat stabilizer is a mixture of neopentyl glycol and 1, 4-cyclohexanedimethanol.
Preferably, the additive is a mixture of silica, calcium carbonate and barium sulfate.
Preferably, the temperature in the filling tower of S2 is kept between 150 ℃ and 170 ℃, the steam pressure is kept between 0.3 MPa and 0.5MPa, and the drying time is kept between 4 hours and 5 hours.
Preferably, the temperature of the single-screw extruder in S3 from the feeding port to the head is set to be 220-270 ℃.
Preferably, the melt metering pump in S3 is embodied as a three-gear pump, and the temperature of the melt metering pump is kept between 250 ℃ and 280 DEG C
Preferably, the preheating temperature of the longitudinal stretching is 60-80 ℃, the stretching temperature is 85-110 ℃, and the stretching ratio is 3-3.5 times.
Preferably, the preheating temperature of the transverse stretching is 80-100 ℃, the stretching temperature is 80-100 ℃, and the stretching magnification is 3-4 times.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of a high-temperature-resistant electrically-insulated BOPET (biaxially oriented polyethylene terephthalate) film, which has the following beneficial effects:
the preparation method of the high-temperature-resistant electrically-insulated BOPET biaxially oriented film comprises the steps of arranging polyethylene terephthalate resin, an antibacterial agent, a heat stabilizer and an additive, wherein the antibacterial agent is a nano-magnesium oxide antibacterial agent, the heat stabilizer is a mixture of neopentyl glycol and 1, 4-cyclohexanedimethanol, the additive is a mixture of silicon dioxide, calcium carbonate and barium sulfate, and steric hindrance and shielding effects of groups of the neopentyl glycol and the 1, 4-cyclohexanedimethanol on structural units in a high molecular chain enhance the stability of polyester macromolecules, hydrolysis and degradation of the macromolecules are inhibited under the subsequent thermal processing condition, so that the plastic film has excellent high-temperature-resistant electrically-insulated protective performance, corona discharge is generated on an electrode through a corona processor, the surface of the plastic film is impacted under the action of a strong electric field, and the surface of the film is activated, the surface wet tension of the film is increased, so that effective static electricity removing operation is performed, the plastic film has good antistatic performance, and the biaxially oriented film can better meet the actual production requirement.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation method of a high-temperature-resistant and electrically-insulated BOPET biaxially oriented film comprises the following steps:
s1, mixing ingredients
Preparing quantitative polyethylene terephthalate resin, an antibacterial agent, a heat stabilizer and an additive;
s2, crystallizing and drying
Preparing a packed tower with a crystallization bed, enabling the packed tower to be provided with an air compressor, a molecular sieve dehumidifier and a heater, and putting the polyethylene terephthalate resin into the packed tower for continuous drying to enable the moisture content of the polyethylene terephthalate resin to be below 50 ppm;
s3. melt extrusion
Feeding the polyethylene terephthalate resin subjected to crystallization and drying treatment in the S2 into a single-screw extruder for melting and plasticizing, then performing coarse filtration operation on the melted and plasticized material through a coarse filter through a melt pipeline, stably conveying the material into a fine filter through a melt metering pump for filtering, homogenizing the melt temperature of the filtered material through a static mixer, and then feeding an antibacterial agent, a heat stabilizer and an additive into the single-screw extruder to obtain a melt;
s4, cooling cast sheet
Feeding the two molten materials in the step S3 into a die head to enable the melt to flow out in a viscous state, and rapidly cooling the flowing melt through a casting sheet roller to enable the melt to form a glass-state casting sheet with uniform thickness for later use;
s5, longitudinal stretching
Placing the cast piece obtained in the step S4 into a longitudinal stretching machine, and performing longitudinal stretching in a heated state;
s6, transversely stretching
Putting the longitudinally stretched cast sheet into a transverse stretcher again, and performing transverse stretching in a heating state to obtain a biaxially oriented film;
s7, final treatment
The film obtained in the S6 is firstly subjected to film thickness detection through a thickness gauge, then corona discharge is generated on an electrode through a corona processor, the surface of the plastic film is impacted under the action of a strong electric field, the surface of the film is activated, the surface moisture tension of the film is increased, effective static electricity removing operation is performed, then the film is wound through a film winding machine, and after the winding is completed, the plastic film is cut through a part to ensure that a cutting machine finished product is formed, and the manufacturing of the film is completed.
And S4, introducing cooling water with the temperature of 30 ℃ into the casting sheet roller to ensure that the casting sheet is cooled to below 60 ℃.
The antibacterial agent is specifically a nano magnesium oxide antibacterial agent.
The heat stabilizer is a mixture of neopentyl glycol and 1, 4-cyclohexanedimethanol.
The additive is specifically a mixture of silica, calcium carbonate and barium sulfate.
And S2, keeping the temperature in the filling tower at 150-170 ℃, keeping the steam pressure at 0.3-0.5 MPa, and keeping the drying time for 4-5 hours.
The temperature of the single-screw extruder from the feed inlet to the head in S3 was set to 220 ℃ to 270 ℃.
The melt metering pump in S3 is specifically a three-gear pump, and the temperature of the melt metering pump is kept between 250 ℃ and 280 DEG C
The preheating temperature of the longitudinal stretching is 60-80 ℃, the stretching temperature is 85-110 ℃, and the stretching ratio is 3-3.5 times.
The preheating temperature of the transverse stretching is 80-100 ℃, the stretching temperature is 80-100 ℃, and the stretching ratio is 3-4 times.
In summary, the preparation method of the high-temperature-resistant electrically-insulated BOPET biaxially oriented film comprises the steps of preparing quantitative polyethylene terephthalate resin, an antibacterial agent, a heat stabilizer and an additive; preparing a packed tower with a crystallization bed, enabling the packed tower to be provided with an air compressor, a molecular sieve dehumidifier and a heater, and putting the polyethylene terephthalate resin into the packed tower for continuous drying to enable the moisture content of the polyethylene terephthalate resin to be below 50 ppm; feeding the crystallized and dried polyethylene terephthalate resin into a single-screw extruder for melting and plasticizing, then performing coarse filtration operation on the melted and plasticized material through a coarse filter through a melt pipeline, stably conveying the material into a fine filter through a melt metering pump for filtering, homogenizing the melt temperature of the filtered material through a static mixer, and then introducing an antibacterial agent, a heat stabilizer and an additive into the single-screw extruder to obtain a melt; feeding the two molten materials into a die head to enable the melt to flow out in a viscous state, and rapidly cooling the flowing melt through a sheet casting roller to enable the melt to form a glassy cast sheet with uniform thickness for later use; putting the obtained cast sheet into a longitudinal stretching machine, and stretching longitudinally under a heating state; putting the longitudinally stretched cast sheet into a transverse stretcher again, and performing transverse stretching in a heating state to obtain a biaxially oriented film; the obtained film is firstly subjected to film thickness detection by a thickness gauge, then an electrode is subjected to corona discharge by a corona processor, the surface of the plastic film is impacted under the action of a strong electric field, so that the surface of the film is activated, the surface moisture tension of the film is increased, effective static electricity removal operation is carried out, then the film is wound by a film winding machine, the plastic film is cut by a splitting machine after the winding is finished to ensure that a finished product is obtained, the film is manufactured, the antibacterial agent, the heat stabilizer and the additive are arranged, the antibacterial agent is a nano magnesium oxide antibacterial agent, the heat stabilizer is a mixture of neopentyl glycol and 1, 4-cyclohexanedimethanol, the additive is a mixture of silicon dioxide, calcium carbonate and barium sulfate, and the steric hindrance and shielding effect of groups of neopentyl glycol and 1, 4-cyclohexanedimethanol on structural units in a macromolecular chain are achieved, the stability of polyester polymer has been strengthened, under the hot working condition afterwards, the hydrolysis and the degradation of polymer have been inhibited, make plastic film have outstanding high temperature resistant electrical insulation's protective properties, and make the electrode take place corona discharge through the corona treatment machine, impact plastic film's surface under the strong electric field effect, make film surface activation, in order to increase the surface wet tension of film, thereby carry out effectual destaticizing operation, make plastic film have fine antistatic properties, make satisfying the actual production needs that biaxial stretching film can be better.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A preparation method of a high-temperature-resistant and electrically-insulated BOPET biaxially oriented film is characterized by comprising the following steps: the method comprises the following steps:
s1, mixing ingredients
Preparing quantitative polyethylene terephthalate resin, an antibacterial agent, a heat stabilizer and an additive;
s2, crystallizing and drying
Preparing a packed tower with a crystallization bed, enabling the packed tower to be provided with an air compressor, a molecular sieve dehumidifier and a heater, and putting the polyethylene terephthalate resin into the packed tower for continuous drying to enable the moisture content of the polyethylene terephthalate resin to be below 50 ppm;
s3. melt extrusion
Feeding the polyethylene terephthalate resin subjected to crystallization and drying treatment in the S2 into a single-screw extruder for melting and plasticizing, then performing coarse filtration operation on the melted and plasticized material through a coarse filter through a melt pipeline, stably conveying the material into a fine filter through a melt metering pump for filtering, homogenizing the melt temperature of the filtered material through a static mixer, and then feeding an antibacterial agent, a heat stabilizer and an additive into the single-screw extruder to obtain a melt;
s4, cooling cast sheet
Feeding the two molten materials in the step S3 into a die head to enable the melt to flow out in a viscous state, and rapidly cooling the flowing melt through a casting sheet roller to enable the melt to form a glass-state casting sheet with uniform thickness for later use;
s5, longitudinal stretching
Placing the cast piece obtained in the step S4 into a longitudinal stretching machine, and performing longitudinal stretching in a heated state;
s6, transversely stretching
Putting the longitudinally stretched cast sheet into a transverse stretcher again, and performing transverse stretching in a heating state to obtain a biaxially oriented film;
s7, final treatment
The film obtained in the S6 is firstly subjected to film thickness detection through a thickness gauge, then corona discharge is generated on an electrode through a corona processor, the surface of the plastic film is impacted under the action of a strong electric field, the surface of the film is activated, the surface moisture tension of the film is increased, effective static electricity removing operation is performed, then the film is wound through a film winding machine, and after the winding is completed, the plastic film is cut through a part to ensure that a cutting machine finished product is formed, and the manufacturing of the film is completed.
2. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: and (3) introducing cooling water with the temperature of 30 ℃ into the casting sheet roller in the step S4 to ensure that the casting sheet is cooled to below 60 ℃.
3. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: the antibacterial agent is specifically a nano magnesium oxide antibacterial agent.
4. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: the heat stabilizer is a mixture of neopentyl glycol and 1, 4-cyclohexanedimethanol.
5. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: the additive is specifically a mixture of silicon dioxide, calcium carbonate and barium sulfate.
6. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: and the temperature in the filling tower in the S2 is kept at 150-170 ℃, the steam pressure is kept at 0.3-0.5 MPa, and the drying time is kept for 4-5 hours.
7. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: the temperature of the single-screw extruder in the S3 from the feed inlet to the head is set to be 220-270 ℃.
8. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: the melt metering pump in the S3 is specifically a three-gear pump, and the temperature of the melt metering pump is kept between 250 ℃ and 280 ℃.
9. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: the preheating temperature of the longitudinal stretching is 60-80 ℃, the stretching temperature is 85-110 ℃, and the stretching ratio is 3-3.5 times.
10. The method for preparing the high-temperature-resistant and electrically-insulating BOPET biaxially oriented film according to claim 1, wherein the method comprises the following steps: the preheating temperature of the transverse stretching is 80-100 ℃, the stretching temperature is 80-100 ℃, and the stretching ratio is 3-4 times.
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| CN114149665A (en) * | 2021-12-22 | 2022-03-08 | 安徽和怡光电新材料有限公司 | Preparation method and system of high-reflectivity PET film |
| CN114229549A (en) * | 2021-12-15 | 2022-03-25 | 南京兰埔成新材料有限公司 | Preparation method and device of double-pull polyester reflecting film |
| CN114262504A (en) * | 2021-12-27 | 2022-04-01 | 安徽和怡光电新材料有限公司 | Preparation method and system of high-temperature-resistant PET film |
| CN116479683A (en) * | 2023-06-25 | 2023-07-25 | 烟台泰和新材高分子新材料研究院有限公司 | Preparation method of adhesive-free insulating composite paper and insulating composite paper |
| CN116945661A (en) * | 2023-08-14 | 2023-10-27 | 广东宝佳利新材料股份有限公司 | Antibacterial polyester film and preparation process thereof |
| CN117164909A (en) * | 2023-08-30 | 2023-12-05 | 浙江建兴科技有限公司 | Preparation method of melt straight-pull weather-resistant solar backboard base film |
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