CN113764122A - Conductive aluminum foil mylar - Google Patents
Conductive aluminum foil mylar Download PDFInfo
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- CN113764122A CN113764122A CN202111236758.1A CN202111236758A CN113764122A CN 113764122 A CN113764122 A CN 113764122A CN 202111236758 A CN202111236758 A CN 202111236758A CN 113764122 A CN113764122 A CN 113764122A
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- Prior art keywords
- polyester
- aluminum foil
- temperature
- polyester film
- foil mylar
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 51
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000011888 foil Substances 0.000 title claims abstract description 51
- 229920002799 BoPET Polymers 0.000 title claims abstract description 43
- 239000005041 Mylar™ Substances 0.000 title claims abstract description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 113
- 239000004005 microsphere Substances 0.000 claims abstract description 75
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229920000728 polyester Polymers 0.000 claims abstract description 59
- 229920006267 polyester film Polymers 0.000 claims abstract description 53
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 21
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 16
- 238000005886 esterification reaction Methods 0.000 claims abstract description 14
- 239000005030 aluminium foil Substances 0.000 claims abstract description 8
- 239000003054 catalyst Substances 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 4
- 230000032050 esterification Effects 0.000 claims abstract description 3
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 24
- 238000002360 preparation method Methods 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical group [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000006068 polycondensation reaction Methods 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 230000003301 hydrolyzing effect Effects 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 9
- 230000001070 adhesive effect Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 9
- 238000013329 compounding Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000032683 aging Effects 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 7
- 238000009998 heat setting Methods 0.000 description 7
- 239000000725 suspension Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 241000209140 Triticum Species 0.000 description 2
- 235000021307 Triticum Nutrition 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- LTCGPBFXHHQAIG-UHFFFAOYSA-N C(C)O[SiH](OCC)OCC.OCCN(CCC)CCO Chemical compound C(C)O[SiH](OCC)OCC.OCCN(CCC)CCO LTCGPBFXHHQAIG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
-
- 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
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
-
- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The application belongs to the technical field of aluminum foil mylar, and particularly relates to a conductive aluminum foil mylar which comprises a polyester film and an aluminum foil, wherein the polyester film and the aluminum foil are bonded and fixed through an adhesive, and the polyester film is obtained by extruding, casting, stretching, shaping, cooling and rolling polyester; the polyester is obtained by adding terephthalic acid, ethylene glycol, modified silicon dioxide hollow microspheres and a catalyst into a polymerization kettle for esterification and polymerization. The utility model provides a modified silica hollow microsphere has been added in the used polyester of polyester film in electrically conductive aluminium foil mylar, through the silica particle who contains the hole to introducing inside in the polyester film, can effectively reduce polyester film's dielectric constant, and then reduce the dielectric loss of aluminium foil mylar, in addition because silica hollow microsphere adds the polyester system after the modification, can homodisperse and firmly fix in the polyester, play better effect that reduces dielectric constant.
Description
Technical Field
The application belongs to the technical field of aluminium foil wheat, concretely relates to electrically conductive aluminium foil wheat.
Background
The aluminum foil mylar is formed by taking a metal aluminum foil as a base material, gluing the metal aluminum foil with a back glue and then attaching a polyester tape, wherein thin aluminum foils with the thickness of 7 mu m and 9 mu m are selected, and along with the trend of tiny and thin products in the electronic industry, aluminum foils with the thickness of 4 mu m are gradually increased in recent years and are different in the application industry and the final application.
Polyester film (PET), especially biaxially oriented polyester film (BOPET), has become a common polyester material in aluminum foil Mylar due to its characteristics of high strength, strong toughness, good wear resistance, high gloss and good transparency. Chinese patent document CN 105489291A discloses a Mylar tape for packaging cables or optical cables and a manufacturing method thereof, wherein 50-65 parts of polyethylene terephthalate, 5-10 parts of polycarbonate, 5-10 parts of high-density polyethylene, 5-10 parts of polypropylene, 5-10 parts of polyolefin thermoplastic elastomer, 1-3 parts of polyethylene wax, 0.5-1.5 parts of tricresyl phosphate, 0.5-1.5 parts of triphenyl phosphate and 1-3 parts of antioxidant 1010 are adopted to prepare the Mylar tape for a Mylar layer, and the prepared polyester tape is improved in strength, toughness, aging resistance, stripping resistance and the like.
However, in the process of realizing the present application, the inventors found that a higher dielectric constant of the polyester tape leads to a larger dielectric loss, and therefore, it is necessary to develop a polyester tape having a lower dielectric constant to reduce the dielectric loss of the aluminum foil mylar.
Disclosure of Invention
In order to solve the problems, the application discloses a conductive aluminum foil mylar, wherein modified silica hollow microspheres are added into polyester used by a polyester film, silica particles with holes inside are introduced into the polyester film, so that the dielectric constant of the polyester film can be effectively reduced, the dielectric loss of the aluminum foil mylar is further reduced, and the silica hollow microspheres are added into a polyester system after being modified, so that the silica hollow microspheres can be uniformly dispersed and firmly fixed in the polyester, and a better effect of reducing the dielectric constant is achieved.
The application provides a conductive aluminum foil mylar, adopts following technical scheme:
a conductive aluminum foil Mylar comprises a polyester film and an aluminum foil, wherein the polyester film and the aluminum foil are bonded and fixed through an adhesive, and the polyester film is obtained by extruding polyester, casting, stretching in two directions, shaping, cooling and rolling; the polyester is obtained by adding terephthalic acid, ethylene glycol, modified silicon dioxide hollow microspheres and a catalyst into a polymerization kettle for esterification and polymerization.
Preferably, the molar ratio of terephthalic acid to ethylene glycol is 1: 1.1-2; the dosage of the modified silicon dioxide hollow microspheres is 2-5% of the total mass of terephthalic acid and ethylene glycol.
Preferably, the modified silica hollow microspheres are silica hollow microspheres modified with silane coupling agent a 1111.
Preferably, the modified silica hollow microsphere is a silica hollow microsphere modified by a dihydroxyl long-chain silane coupling agent, and the structural formula of the dihydroxyl long-chain silane coupling agent is as follows:
the preparation method of the dihydroxyl long-chain silane coupling agent comprises the following steps: adding 1, 3-propanediol-2- (9-decenyl) and trimethoxy silane into a reaction kettle according to the molar ratio of 1:1, adding 20ppm of Pt catalyst, heating to 90 ℃ under stirring, and reacting for 8 hours, wherein the reaction equation is as follows:
preferably, the silica hollow microspheres have a particle size of 5 to 15 μm.
Preferably, the preparation method of the modified silica hollow microsphere comprises the following steps: dispersing a silane coupling agent in an ethanol water solution with the volume fraction of ethanol of 95%, hydrolyzing for 5min, then adding the silicon dioxide hollow microspheres, stirring for 30min at 40 ℃, filtering, washing, drying and grinding to obtain the modified silicon dioxide hollow microspheres.
Preferably, the silane coupling agent is used in an amount of 1 to 2wt% based on the silica hollow microspheres.
Preferably, the catalyst is tetrabutyl titanate.
Preferably, the specific preparation method of the polyester comprises the following steps: adding terephthalic acid, ethylene glycol, modified silica hollow microspheres and a catalyst into a polymerization kettle together, reducing the pressure in the kettle to 0.7MPa, raising the temperature to 260 ℃, carrying out esterification reaction for 1h, then enabling the pressure in the kettle to reach 1.0MPa, raising the temperature to 280 ℃, carrying out polycondensation reaction for 3h, and cooling to obtain the polyester.
Preferably, the specific preparation method of the polyester film comprises the following steps: transferring the polyester into an extruder, extruding, casting, stretching, sizing, cooling and rolling, wherein the extrusion temperature is 220-260 ℃, the casting roller temperature is not higher than 35 ℃, the longitudinal stretching temperature is 80-100 ℃, the stretching ratio is 3-4 times, the transverse stretching temperature is 100-120 ℃, the stretching ratio is 3-4 times, the sizing temperature is 200-220 ℃, and the cooling temperature is not higher than 80 ℃.
The application has the following beneficial effects:
(1) the utility model provides a modified silica hollow microsphere has been added in the used polyester of polyester film in electrically conductive aluminium foil mylar, through the silica particle who contains the hole to introducing inside in the polyester film, can effectively reduce polyester film's dielectric constant, and then reduce the dielectric loss of aluminium foil mylar, in addition because silica hollow microsphere adds the polyester system after the modification, can homodisperse and firmly fix in the polyester, play better effect that reduces dielectric constant.
(2) The modified silica hollow microsphere used in the application is a silica hollow microsphere modified by a silane coupling agent A1111 or a dihydroxy long-chain silane coupling agent, the surface of the modified silica hollow microsphere is grafted with a dihydroxy structure, the structure can be polymerized with terephthalic acid, and the structure is introduced into polyester in a polymerization mode, so that the silica hollow microsphere is fixed in the polyester, the effect of reducing the dielectric constant for a long time is achieved, and the condition that the dielectric constant is greatly increased due to the migration and precipitation of the silica hollow microsphere after a period of time can not occur.
(3) The silica hollow microspheres in the application can play a role similar to 'pinning' after being fixed in polyester through the esterification reaction of a surface grafted dihydroxyl structure and terephthalic acid, so that a network with uniformly distributed 'pinning points' is formed, the stability of the polyester film is favorably improved, and the condition that the mechanical property of the polyester film is obviously reduced due to the increase of porosity in the traditional method for reducing the dielectric constant of the polyester film by compounding inorganic materials containing holes in the interior is effectively avoided.
(4) Because the silica hollow microspheres can be subjected to esterification reaction with terephthalic acid through the surface-grafted dihydroxy structure, the silica hollow microspheres can be dragged to be more uniformly arranged in the reaction bonding process, and compared with a common silane coupling agent which cannot react, the uniform dispersion of the silica hollow microspheres is more facilitated, so that the polyester film can be helped to obtain better mechanical properties and performances.
Detailed Description
The present application will now be described in further detail with reference to examples.
The modified silicon dioxide hollow microsphere A is prepared by the following method:
dispersing 10g of silane coupling agent A1111(3- [ bis (2-hydroxyethyl) amino ] propane triethoxysilane) in 4L ethanol aqueous solution with the volume fraction of ethanol of 95%, ultrasonically oscillating and hydrolyzing for 5min, then adding 1kg of silicon dioxide hollow microspheres, stirring for 30min at 40 ℃, filtering, washing, drying and grinding to obtain the modified silicon dioxide hollow microspheres A.
The modified silicon dioxide hollow microsphere B is prepared by the following method:
dispersing 15g of silane coupling agent A1111 in 4L ethanol water solution with the volume fraction of ethanol being 95%, carrying out ultrasonic oscillation hydrolysis for 5min, then adding 1kg of silicon dioxide hollow microspheres, stirring for 30min at 40 ℃, filtering, washing, drying and grinding to obtain modified silicon dioxide hollow microspheres B.
The modified silicon dioxide hollow microsphere C is prepared by the following method:
dispersing 20g of silane coupling agent A1111 in 4L ethanol water solution with the volume fraction of ethanol being 95%, carrying out ultrasonic oscillation hydrolysis for 5min, then adding 1kg of silicon dioxide hollow microspheres, stirring for 30min at 40 ℃, filtering, washing, drying and grinding to obtain modified silicon dioxide hollow microspheres C.
The modified silicon dioxide hollow microsphere D is prepared by the following method:
dispersing 15g of dihydroxy long-chain silane coupling agent in 4L of ethanol aqueous solution with the volume fraction of ethanol of 95%, ultrasonically oscillating for hydrolysis for 5min, then adding 1kg of silicon dioxide hollow microspheres, stirring for 30min at 40 ℃, filtering, washing, drying and grinding to obtain modified silicon dioxide hollow microspheres D.
The modified silicon dioxide hollow microsphere E is prepared by the following method:
dispersing 15g of silane coupling agent KH570 in 4L of ethanol aqueous solution with the volume fraction of ethanol of 95%, ultrasonically oscillating for hydrolysis for 5min, then adding 1kg of silicon dioxide hollow microspheres, stirring for 30min at 40 ℃, filtering, washing, drying and grinding to obtain modified silicon dioxide hollow microspheres E.
Example 1
Preparation of polyester: 10kg of terephthalic acid, 4.12kg of ethylene glycol, 0.28kg of modified silica hollow microsphere A and 15g of tetrabutyl titanate are added into a polymerization kettle together (wherein the modified silica hollow microsphere A is added in the form of ethylene glycol suspension), the pressure in the kettle is reduced to 0.7MPa, the temperature is raised to 260 ℃, esterification reaction is carried out for 1h, then the pressure in the kettle is raised to 1.0MPa, the temperature is raised to 280 ℃, polycondensation reaction is carried out for 3h, and the polyester is obtained after cooling.
Preparation of polyester film: transferring the polyester into an extruder, extruding the polyester through a T-shaped die head, controlling the extrusion temperature at 220 ℃, then casting a sheet, controlling the temperature of a sheet casting roller to be lower than 35 ℃, then longitudinally stretching at the stretching temperature of 80 ℃ and the stretching multiple of 3 times, then transversely stretching at the stretching temperature of 100 ℃ and the stretching multiple of 3 times, then performing heat setting at the temperature of 200 ℃, and then cooling below 80 ℃ to obtain the polyester film.
Preparing aluminum foil mylar: and bonding and compounding the aluminum foil and the polyester film together through an adhesive, and cutting to obtain the aluminum foil mylar.
Example 2
Preparation of polyester: 10kg of terephthalic acid, 7.47kg of ethylene glycol, 0.87kg of modified silica hollow microsphere C and 15g of tetrabutyl titanate are added into a polymerization kettle together (wherein the modified silica hollow microsphere C is added in the form of ethylene glycol suspension), the pressure in the kettle is reduced to 0.7MPa, the temperature is increased to 260 ℃, esterification reaction is carried out for 1h, then the pressure in the kettle is increased to 1.0MPa, the temperature is increased to 280 ℃, polycondensation reaction is carried out for 3h, and the polyester is obtained after cooling.
Preparation of polyester film: transferring the polyester into an extruder, extruding the polyester through a T-shaped die head, controlling the extrusion temperature to be 260 ℃, then casting a sheet, controlling the temperature of a sheet casting roller to be lower than 35 ℃, then longitudinally stretching at the stretching temperature of 1000 ℃ and the stretching multiple of 4 times, then transversely stretching at the stretching temperature of 120 ℃ and the stretching multiple of 4 times, then performing heat setting at the temperature of 220 ℃, and then cooling below 80 ℃ to obtain the polyester film.
Preparing aluminum foil mylar: and bonding and compounding the aluminum foil and the polyester film together through an adhesive, and cutting to obtain the aluminum foil mylar.
Example 3
Preparation of polyester: 10kg of terephthalic acid, 6.3kg of ethylene glycol, 0.65kg of modified silica hollow microspheres B and 15g of tetrabutyl titanate are added into a polymerization kettle together (wherein the modified silica hollow microspheres B are added in the form of ethylene glycol suspension), the pressure in the kettle is reduced to 0.7MPa, the temperature is raised to 260 ℃, esterification reaction is carried out for 1h, then the pressure in the kettle is raised to 1.0MPa, the temperature is raised to 280 ℃, polycondensation reaction is carried out for 3h, and the polyester is obtained after cooling.
Preparation of polyester film: transferring the polyester into an extruder, extruding the polyester through a T-shaped die head, controlling the extrusion temperature to be 250 ℃, then casting a sheet, controlling the temperature of a sheet casting roller to be lower than 35 ℃, then longitudinally stretching the sheet at the stretching temperature of 95 ℃ and the stretching multiple of 3.8 times, then transversely stretching the sheet at the stretching temperature of 115 ℃ and the stretching multiple of 3.8 times, then performing heat setting at the temperature of 215 ℃, and then cooling below 80 ℃ to obtain the polyester film.
Preparing aluminum foil mylar: and bonding and compounding the aluminum foil and the polyester film together through an adhesive, and cutting to obtain the aluminum foil mylar.
Example 4
Preparation of polyester: 10kg of terephthalic acid, 5.6kg of ethylene glycol, 0.47kg of modified silica hollow microspheres B and 15g of tetrabutyl titanate are added into a polymerization kettle together (wherein the modified silica hollow microspheres B are added in the form of ethylene glycol suspension), the pressure in the kettle is reduced to 0.7MPa, the temperature is raised to 260 ℃, esterification reaction is carried out for 1h, then the pressure in the kettle is raised to 1.0MPa, the temperature is raised to 280 ℃, polycondensation reaction is carried out for 3h, and the polyester is obtained after cooling.
Preparation of polyester film: transferring the polyester into an extruder, extruding the polyester through a T-shaped die head, controlling the extrusion temperature to be 240 ℃, then casting a sheet, controlling the temperature of a sheet casting roller to be lower than 35 ℃, then longitudinally stretching the sheet at the stretching temperature of 90 ℃ and the stretching multiple of 3.5 times, then transversely stretching the sheet at the stretching temperature of 110 ℃ and the stretching multiple of 3.5 times, then performing heat setting at the temperature of 210 ℃, and then cooling below 80 ℃ to obtain the polyester film.
Preparing aluminum foil mylar: and bonding and compounding the aluminum foil and the polyester film together through an adhesive, and cutting to obtain the aluminum foil mylar.
Example 5
Preparation of polyester: 10kg of terephthalic acid, 5.6kg of ethylene glycol, 0.47kg of modified silica hollow microspheres D and 15g of tetrabutyl titanate are added into a polymerization kettle together (wherein the modified silica hollow microspheres D are added in the form of ethylene glycol suspension), the pressure in the kettle is reduced to 0.7MPa, the temperature is raised to 260 ℃, esterification reaction is carried out for 1h, then the pressure in the kettle is raised to 1.0MPa, the temperature is raised to 280 ℃, polycondensation reaction is carried out for 3h, and the polyester is obtained after cooling.
Preparation of polyester film: transferring the polyester into an extruder, extruding the polyester through a T-shaped die head, controlling the extrusion temperature to be 240 ℃, then casting a sheet, controlling the temperature of a sheet casting roller to be lower than 35 ℃, then longitudinally stretching the sheet at the stretching temperature of 90 ℃ and the stretching multiple of 3.5 times, then transversely stretching the sheet at the stretching temperature of 110 ℃ and the stretching multiple of 3.5 times, then performing heat setting at the temperature of 210 ℃, and then cooling below 80 ℃ to obtain the polyester film.
Preparing aluminum foil mylar: and bonding and compounding the aluminum foil and the polyester film together through an adhesive, and cutting to obtain the aluminum foil mylar.
Comparative example 1
Preparation of polyester: 10kg of terephthalic acid, 5.6kg of ethylene glycol, 0.47kg of modified silica hollow microspheres E and 15g of tetrabutyl titanate are added into a polymerization kettle together (wherein the modified silica hollow microspheres E are added in the form of ethylene glycol suspension), the pressure in the kettle is reduced to 0.7MPa, the temperature is raised to 260 ℃, esterification reaction is carried out for 1h, then the pressure in the kettle is raised to 1.0MPa, the temperature is raised to 280 ℃, polycondensation reaction is carried out for 3h, and the polyester is obtained after cooling.
Preparation of polyester film: transferring the polyester into an extruder, extruding the polyester through a T-shaped die head, controlling the extrusion temperature to be 240 ℃, then casting a sheet, controlling the temperature of a sheet casting roller to be lower than 35 ℃, then longitudinally stretching the sheet at the stretching temperature of 90 ℃ and the stretching multiple of 3.5 times, then transversely stretching the sheet at the stretching temperature of 110 ℃ and the stretching multiple of 3.5 times, then performing heat setting at the temperature of 210 ℃, and then cooling below 80 ℃ to obtain the polyester film.
Preparing aluminum foil mylar: and bonding and compounding the aluminum foil and the polyester film together through an adhesive, and cutting to obtain the aluminum foil mylar.
Comparative example 2
Preparation of polyester: adding 10kg of terephthalic acid, 5.6kg of ethylene glycol and 15g of tetrabutyl titanate into a polymerization kettle together, reducing the pressure in the kettle to 0.7MPa, raising the temperature to 260 ℃, carrying out esterification reaction for 1h, then raising the pressure in the kettle to 1.0MPa, raising the temperature to 280 ℃, carrying out polycondensation reaction for 3h, and cooling to obtain the polyester.
Preparation of polyester film: transferring the polyester into an extruder, extruding the polyester through a T-shaped die head, controlling the extrusion temperature to be 240 ℃, then casting a sheet, controlling the temperature of a sheet casting roller to be lower than 35 ℃, then longitudinally stretching the sheet at the stretching temperature of 90 ℃ and the stretching multiple of 3.5 times, then transversely stretching the sheet at the stretching temperature of 110 ℃ and the stretching multiple of 3.5 times, then performing heat setting at the temperature of 210 ℃, and then cooling below 80 ℃ to obtain the polyester film.
Preparing aluminum foil mylar: and bonding and compounding the aluminum foil and the polyester film together through an adhesive, and cutting to obtain the aluminum foil mylar.
The polyester films prepared in examples 1 to 5 and comparative examples 1 to 2 were subjected to various property tests, and the test results are shown in Table 1.
TABLE 1
The aging conditions in table 1 are: the polyester film is put into an accelerated ageing oven with the temperature of 105 ℃ and the relative humidity of 100 percent RH for ageing treatment for 168 hours.
As can be seen from table 1, the polyester films prepared in embodiments 1 to 5 of the present application have a longitudinal tensile strength of 181MPa or more and a longitudinal elongation at break of 76% or more, and the longitudinal tensile strength after aging still reaches 173MPa or more, and have a low dielectric constant of 2.97 or less and a dielectric loss of 0.010 or less, and thus, by using the technical scheme of the present application, a polyester film having a good mechanical property and a low dielectric constant can be obtained, which is helpful for reducing the dielectric loss of mylar of aluminum foil. As can be seen from comparison between example 4 and example 5, when the bishydroxy long-chain silane coupling agent is used in example 5, the segment length is larger than that of the silane coupling agent A1111 used in example 4, so that the connection elasticity between the silica hollow microspheres and the polyester is possibly larger, and the elongation at break in the longitudinal direction of example 5 is higher than that of example 4 under other similar properties.
In addition, as can be seen from comparative example 1, when comparative example 1 is different from example 4 only in that the modifier modified to the silica hollow microspheres is replaced with the silane coupling agent KH570 of comparative example 1 from the silane coupling agent a1111 of example 4, although a relatively good dispersion effect can be obtained, since the silane coupling agent KH570 cannot perform a bonding reaction with the matrix, although the dispersion uniformity of the silica hollow microspheres is improved, there is no chemical bond connection between the silica hollow microspheres and the polyester, resulting in relatively poor tensile strength and elongation at break, and the tensile strength after aging is more remarkably reduced. It can be seen from comparative example 2 that when comparative example 2 is compared with example 4 without adding silica hollow microspheres, although the elongation at break in the machine direction is significantly higher than that of the other comparative examples and examples, the tensile strength in the machine direction, particularly after aging, is significantly reduced, and the dielectric constant and dielectric loss are relatively higher due to the absence of silica hollow microspheres, indicating that the addition of silica hollow microspheres is advantageous for reducing the dielectric constant and dielectric loss of the polyester film.
The present embodiment is merely illustrative and not restrictive, and various changes and modifications may be made by persons skilled in the art without departing from the scope of the present invention as defined in the appended claims. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The utility model provides a conductive aluminum foil mylar, includes polyester film and aluminium foil, polyester film passes through the adhesive bonding with the aluminium foil and fixes, its characterized in that: the polyester film is obtained by extruding polyester, casting, biaxially stretching, shaping, cooling and rolling; the polyester is obtained by adding terephthalic acid, ethylene glycol, modified silicon dioxide hollow microspheres and a catalyst into a polymerization kettle for esterification and polymerization.
2. The conductive aluminum foil mylar as recited in claim 1, wherein: the molar ratio of the terephthalic acid to the ethylene glycol is 1: 1.1-2; the dosage of the modified silicon dioxide hollow microspheres is 2-5% of the total mass of terephthalic acid and ethylene glycol.
3. The conductive aluminum foil mylar as recited in claim 1, wherein: the modified silica hollow microsphere is a silica hollow microsphere modified by a silane coupling agent A1111.
4. The conductive aluminum foil mylar as recited in claim 1, wherein: the modified silica hollow microsphere is a silica hollow microsphere modified by a dihydroxyl long-chain silane coupling agent, and the structural formula of the dihydroxyl long-chain silane coupling agent is as follows:
5. the conductive aluminum foil mylar as recited in claim 4, wherein: the particle size of the silicon dioxide hollow microsphere is 5-15 μm.
6. The conductive aluminum foil mylar as recited in claim 3 or 4, wherein: the preparation method of the modified silicon dioxide hollow microsphere comprises the following steps: dispersing a silane coupling agent in an ethanol water solution with the volume fraction of ethanol of 95%, hydrolyzing for 5min, then adding the silicon dioxide hollow microspheres, stirring for 30min at 40 ℃, filtering, washing, drying and grinding to obtain the modified silicon dioxide hollow microspheres.
7. The conductive aluminum foil mylar as recited in claim 6, wherein: the dosage of the silane coupling agent is 1-2wt% of the silicon dioxide hollow microsphere.
8. The conductive aluminum foil mylar as recited in claim 1, wherein: the catalyst is tetrabutyl titanate.
9. The conductive aluminum foil mylar as recited in claim 1, wherein: the specific preparation method of the polyester comprises the following steps: adding terephthalic acid, ethylene glycol, modified silica hollow microspheres and a catalyst into a polymerization kettle together, reducing the pressure in the kettle to 0.7MPa, raising the temperature to 260 ℃, carrying out esterification reaction for 1h, then enabling the pressure in the kettle to reach 1.0MPa, raising the temperature to 280 ℃, carrying out polycondensation reaction for 3h, and cooling to obtain the polyester.
10. The conductive aluminum foil mylar as recited in claim 1, wherein: the specific preparation method of the polyester film comprises the following steps: transferring the polyester into an extruder, extruding, casting, stretching, sizing, cooling and rolling, wherein the extrusion temperature is 220-260 ℃, the casting roller temperature is not higher than 35 ℃, the longitudinal stretching temperature is 80-100 ℃, the stretching ratio is 3-4 times, the transverse stretching temperature is 100-120 ℃, the stretching ratio is 3-4 times, the sizing temperature is 200-220 ℃, and the cooling temperature is not higher than 80 ℃.
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