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CN112210315A - Polyester film functional material and preparation method and application thereof - Google Patents

Polyester film functional material and preparation method and application thereof Download PDF

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Publication number
CN112210315A
CN112210315A CN202011065814.5A CN202011065814A CN112210315A CN 112210315 A CN112210315 A CN 112210315A CN 202011065814 A CN202011065814 A CN 202011065814A CN 112210315 A CN112210315 A CN 112210315A
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China
Prior art keywords
release agent
polyester film
silicon release
layer
silicon
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Granted
Application number
CN202011065814.5A
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Chinese (zh)
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CN112210315B (en
Inventor
何森财
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Guangdong Donlee New Materials Technology Lncorporated Co
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Guangdong Donlee New Materials Technology Lncorporated Co
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Priority to CN202011065814.5A priority Critical patent/CN112210315B/en
Publication of CN112210315A publication Critical patent/CN112210315A/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/255—Polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/401—Adhesives in the form of films or foils characterised by release liners characterised by the release coating composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention relates to the technical field of electrolyte-resistant materials, and particularly provides a polyester film functional material and a preparation method and application thereof. The first aspect of the invention provides a polyester film functional material, which comprises a release layer, a substrate layer and a glue layer from top to bottom; the substrate layer is selected from any one of PET substrate, BOPP substrate, PI substrate.

Description

Polyester film functional material and preparation method and application thereof
Technical Field
The invention relates to the technical field of electrolyte-resistant materials, and particularly provides a polyester film functional material and a preparation method and application thereof.
Background
With the rapid development of industries such as mobile phones, electric vehicles, digital products and the like, the demand for new energy batteries will be continuously increased; meanwhile, under the drive of national policies, new energy automobiles have wide development prospects, and lithium batteries serving as core components are also good opportunities for development. Therefore, the termination adhesive tape applied to the new energy battery industry has a huge market demand.
The existing termination adhesive tape for the lithium battery is mainly used for fixing the termination end of a circular or square lithium battery cell and needs to bear the condition of working for a long time in the soaking condition of lithium battery electrolyte. The film pasting process of the lithium battery generally adopts the processes of upper edge sealing → film pasting → vacuum baking → liquid injection → vacuum edge sealing → reshaping → formation and the like, wherein the vacuum baking condition is 85-90 ℃/16-24H, and the reshaping process adopts an upper clamp and a lower clamp to flatten the battery in a cold and hot manner. Therefore, the termination tape for lithium batteries is required to withstand the electrolyte immersion test at 85 ℃.
In the existing termination adhesive tape, the adhesive is generally a rubber type adhesive or a polyisocyanate crosslinked acrylate pressure-sensitive adhesive, and can bear long-time soaking of electrolyte at normal temperature, but once the temperature is higher than 40 ℃, an adhesive layer can be dissolved, faded and shed quickly. The adhesive tape comprises: bear the area, locate the rubber type pressure sensitive glue layer on bearing the area, this sticky tape has following weak point: the cost is high, and the manufacturing process is complicated; after being soaked in the electrolyte for three days, the electrolyte is degummed, discolored and shed, and can not completely meet the application requirements of lithium battery manufacturers.
Disclosure of Invention
In order to solve the technical problems, the invention provides a polyester film functional material, which comprises a release layer, a substrate layer and a glue layer from top to bottom; the substrate layer is selected from any one of PET substrate, BOPP substrate, PI substrate.
In a preferred embodiment of the present invention, the release layer is selected from one of a non-silicon release agent, an organic silicon release agent, a fluorine release agent, and a UV release agent.
As a preferable technical scheme of the invention, the non-silicon release agent comprises a non-silicon release agent A and a non-silicon release agent B.
As a preferable technical scheme of the invention, the melting point of the non-silicon mold release agent A is 87-95 ℃.
As a preferable technical scheme of the invention, the dropping point of the non-silicon release agent B is 83-86 ℃.
As a preferable technical scheme of the invention, the weight ratio of the non-silicon release agent A to the non-silicon release agent B is 1: (0.8 to 1).
As a preferred technical scheme of the invention, the preparation raw materials of the acrylate pressure-sensitive adhesive comprise an acrylate adhesive, a curing agent, a diluent, color paste and tackifying resin.
As a preferable technical scheme of the invention, the tackifying resin is selected from one or a combination of more of epoxy resin, rosin resin, terpene phenol resin and phenolic resin.
The second aspect of the invention provides a preparation method of the polyester film functional material, which at least comprises the following steps:
(1) the base material is subjected to bidirectional stretching and surface corona treatment, so that the surface tension of the glue coating surface of the base material reaches more than 42 dyne/cm;
(2) preparing a non-silicon release agent into a concentration of 0.25-2 wt%, and printing the non-silicon release agent on the back of a base material to enable the release force to reach 20-40 g/25 mm;
(3) coating the acrylate pressure-sensitive adhesive on the adhesive-coated surface of the base material to obtain an adhesive layer, drying, coiling, rewinding and slitting to obtain the acrylic pressure-sensitive adhesive.
The third aspect of the invention provides application of the polyester film functional material to fixing and insulating protection of a pole lug and a termination part of a lithium ion battery cell.
Has the advantages that: the invention provides a polyester film functional material and a preparation method and application thereof, when a release layer prepared by selecting a specific release agent is applied to a lithium ion battery, the phenomena of precipitation and transfer of semiconductor elements can not occur, so that the battery is safer and has more stable performance; in the preparation of the glue layer, the excellent bonding strength can be brought by selecting the specific tackifying resin and controlling the adding amount, the bonding is rapid and durable, and compared with the traditional rubber type pressure-sensitive adhesive, the cost is low and the preparation process is simple. In addition, each component interacts with each other, and the environment-friendly color paste can be coated, so that the battery can resist the soaking of electrolyte for a long time, and the battery can be better applied to the fixation and insulation protection of the electrode lug and the termination part of the lithium ion battery cell.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular.
In order to solve the technical problems, the invention provides a polyester film functional material, which comprises a release layer, a substrate layer and a glue layer from top to bottom; the substrate layer is selected from any one of PET substrate, BOPP substrate, PI substrate.
In the invention, the PET is an abbreviation of polyethylene terephthalate; the BOPP is an abbreviation of biaxially oriented polypropylene film; the PI is an abbreviation for polyimide.
Release layer
The release layer is selected from any one of non-silicon release agents, organic silicon release agents, fluorine release agents and UV release agents.
In a preferred embodiment, the release layer is prepared from a non-silicon release agent.
In a more preferred embodiment, the non-silicon release agent comprises non-silicon release agent a and non-silicon release agent B.
In a more preferred embodiment, the non-silicon mold release agent A has a melting point of 87-95 ℃; more preferably, the melting point of the non-silicon mold release agent A is 87-93 ℃.
In a more preferred embodiment, the non-silicon release agent A is purchased from RL-600 of Meigu chemical Co., Ltd, Guangzhou.
In a more preferred embodiment, the dropping point of the non-silicon release agent B is 83-86 ℃; more preferably, the dropping point of the non-silicon release agent B is 85 ℃.
In a more preferred embodiment, the non-silicon release agent B is purchased from PEELOIL 1010 from sequoia chemical (shanghai) ltd.
The melting point is the temperature at which a solid changes (melts) its state from solid to liquid; the dropping point is the lowest temperature at which a certain fluidity is achieved under specified conditions.
In a more preferred embodiment, the weight ratio of the non-silicon release agent a and the non-silicon release agent B is 1: (0.8 to 1); more preferably, the weight ratio of the non-silicon release agent A to the non-silicon release agent B is 1: 0.9.
substrate layer
The base material layer is a PET base material.
The PET substrate is commercially available, including but not limited to from Yili electronic technology, Inc.
Glue layer
The glue layer is acrylate pressure-sensitive adhesive.
In a preferred embodiment, the raw materials for preparing the acrylate pressure-sensitive adhesive comprise an acrylate adhesive, a curing agent, a diluent, color paste and tackifying resin.
In a more preferable embodiment, the preparation raw materials of the acrylate pressure-sensitive adhesive comprise, by weight, 90-110 parts of acrylate adhesive, 0.8-1.2 parts of curing agent, 80-90 parts of diluent, 5-6 parts of color paste and 10-12 parts of tackifying resin.
In a more preferred embodiment, the raw materials for preparing the acrylate pressure-sensitive adhesive comprise 100 parts by weight of acrylate adhesive, 1 part by weight of curing agent, 85 parts by weight of diluent, 5.5 parts by weight of color paste and 11 parts by weight of tackifying resin.
Acrylate type adhesive
The acrylate-based adhesives of the present invention are commercially available, including but not limited to LOCTITE AA 3311 from the CIS INDUSTRIAL CERAL.
Curing agent
The curing agent is isocyanate curing agent and/or epoxy curing agent.
In a preferred embodiment, the curing agent is an isocyanate-based curing agent.
In a more preferred embodiment, the isocyanate-based curing agent is an aliphatic polyisocyanate.
In a more preferred embodiment, the aliphatic polyisocyanate has an isocyanate-based content of 17 to 21% and a viscosity of 300 to 700 mPas at 25 ℃; more preferably, the aliphatic polyisocyanate has an isocyanate group content of 18.5 to 19.5% and a viscosity of 400 to 600 mPas at 25 ℃.
In a more preferred embodiment, the aliphatic polyisocyanate is purchased from Shinshi 3390 of Wuhanshi Quanxing New materials science and technology, Inc.
The aliphatic polyisocyanate is a clear and transparent liquid at normal temperature, and the solid content is about 90 percent.
The isocyanate group content is a mass of isocyanate (-NCO) groups contained in 100g of a sample, and the test method is not limited.
Diluent
The diluent is selected from one or a combination of more of ethyl acetate, petroleum ether, toluene, xylene, butanone and butyl acetate.
In a preferred embodiment, the diluent is ethyl acetate.
Color paste
The color paste of the invention includes but is not limited to green color paste, dark green color paste, blue color paste and red color paste.
In a preferred embodiment, the color paste is a blue color paste.
The blue color paste can be obtained by commercial purchase, and comprises but is not limited to Jiacai industry Co., Ltd.
Tackifying resins
The tackifying resin is selected from one or a combination of more of epoxy resin, rosin resin, terpene phenol resin and phenolic resin.
In a preferred embodiment, the tackifying resin comprises a rosin resin and a terpene phenol resin.
In a more preferred embodiment, the rosin resin comprises rosin resin a and rosin resin B.
In a more preferred embodiment, the softening point of the rosin resin A is 95-105 ℃, and the acid value is 2-8; more preferably, the softening point of the rosin resin A is 100 ℃, and the acid value of the rosin resin A is 2-8.
In a more preferred embodiment, the softening point of the rosin resin B is 77-83 ℃, and the acid value is 7-15; more preferably, the softening point of the rosin resin B is 80 ℃ and the acid value is 8.
In a more preferred embodiment, the rosin resin a is purchased from RE100F of asian sangana; rosin resin B was purchased from RE80HP of asian sonna company.
In a more preferred embodiment, the terpene-phenol resin has a softening point of 94 to 98 ℃; more preferably, the terpene-phenol resin has a softening point of 96 ℃.
In a more preferred embodiment, the terpene phenol resin is purchased from TP96 of asian sanguina.
In a more preferred embodiment, the weight ratio of the rosin resin a, the rosin resin B and the terpene phenol resin is (1.2 to 1.4): 1: (1.2-1.4); more preferably, the weight ratio of the rosin resin A, the rosin resin B and the terpene phenol resin is 1.3: 1: 1.3.
the softening point (softening point) refers to a temperature at which a substance is softened, and can be obtained by a Vicat (Vicat) method and a ring and ball method, and the test method is not limited by the invention.
The acid value is a number of milligrams of potassium hydroxide (KOH) required for neutralizing 1 gram of the chemical substance, and may be measured by a titration method, a test paper method, a colorimetric method, or the like, and the measurement method is not limited in the present invention.
The preparation method of the acrylate pressure-sensitive adhesive comprises the following steps: adding an acrylate adhesive, a diluent, rosin resin A, rosin resin B, terpene phenol resin and color paste into a reaction kettle, stirring at the temperature of 27 ℃ at 800r/min for 1h, adding a curing agent, continuously stirring for 1h, standing and defoaming to obtain the acrylate pressure-sensitive adhesive.
The second aspect of the present invention provides a method for preparing a polyester film functional material, comprising the following steps:
(1) the base material is subjected to bidirectional stretching and surface corona treatment, so that the surface tension of the glue coating surface of the base material reaches more than 42 dyne/cm;
(2) preparing a non-silicon release agent into a concentration of 0.25-2 wt%, and printing the non-silicon release agent on the back of a base material to enable the release force to reach 20-40 g/25 mm;
(3) coating the acrylate pressure-sensitive adhesive on the adhesive-coated surface of the base material to obtain an adhesive layer, drying, coiling, rewinding and slitting to obtain the acrylic pressure-sensitive adhesive.
In a preferred embodiment, the coating manner in the step (3) is selected from any one of knife coating, roll coating, gravure coating, dimple coating, slot extrusion coating, spray coating, and die coating; preferably, the coating mode in the step (3) is blade coating.
The method for testing the release force is a test method known to those skilled in the art and is not particularly required.
The non-silicon release agent is prepared to have a concentration of 0.25-2 wt%, and the used solvent comprises one or a combination of ethyl acetate, toluene and xylene; preferably, the solvent is ethyl acetate.
Wherein, the release layer is very thin, the thickness of the substrate layer is 0.018-0.02 mm, and the thickness of the glue layer is 0.009-0.01 mm.
In order to improve the adhesion of the adhesive to the substrate layer, the surface of the substrate is treated to improve the surface energy. Corona treatment is most commonly used. Application of a high-frequency voltage between the two electrodes can form a corona or a spark. When a high-frequency voltage is applied between two electrodes on the surface of the polyester film serving as a base material, corona is irradiated to the surface of the polyester film. In this high energy discharge state, electron pairs and ion pairs of the corona collide with the surface of the polyester film, causing the surface to generate charged ions. Simultaneously, the corona also ionizes oxygen, nitrogen, water and other molecules in the environment, and then the molecules react with plastic molecules on the surface to generate polar groups such as hydroxyl, carboxyl, alkoxy and the like. The polar groups and the charged ions on the surface of the polyester film greatly increase the polarity of the surface of the polyester film, and the surface energy is improved, so that the wettability and the adhesive force of the adhesive on the surface of the base material are enhanced, and the operation requirements of printing or bonding and the like on the surface of the polyester film are met. Through corona treatment, the surface tension of the glue-coated surface of the polyester film reaches more than 42 dyne/cm.
The third aspect of the invention provides application of the polyester film functional material, which is applied to fixing and insulating protection of a pole lug and a termination part of a lithium ion battery cell.
The invention adopts a non-silicon mold release agent A with a melting point of 87-95 ℃ and a non-silicon mold release agent B with a dropping point of 83-86 ℃, and the weight ratio of the non-silicon mold release agent A to the non-silicon mold release agent B is limited to 1: (0.8-1) the release layer is prepared, and when the release layer is applied to a lithium ion battery, the phenomena of precipitation and transfer of semiconductor elements cannot occur, so that the battery is safer and has more stable performance; in the preparation of the glue layer, rosin resin A with a softening point of 95-105 ℃ and an acid value of 2-8, rosin resin B with a softening point of 77-83 ℃ and an acid value of 7-15 and terpene phenol resin with a softening point of 94-98 ℃ are selected, and the weight ratio of the rosin resin A to the rosin resin B to the terpene phenol resin is (1.2-1.4): 1: (1.2 to 1.4) the adhesive composition can provide excellent adhesive strength and can be bonded quickly and durably. In addition, each component interacts with each other, the environment-friendly color paste can be coated, so that the environment-friendly color paste can endure electrolyte soaking for a long time, the attached copper foil and the aluminum foil are soaked in the electrolyte and soaked in 72Hrs at 85 ℃, the situations of liquid seepage, bulging, color fading and the like can be avoided, the attachment is tight, the falling does not occur, the service life is long, and the environment-friendly color paste can be better applied to the fixation and insulation protection of the electrode lug and the termination part of the lithium ion battery.
Examples
In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.
Example 1
The embodiment 1 of the invention provides a polyester film functional material, which comprises a release layer, a substrate layer and a glue layer from top to bottom; the substrate layer is a PET substrate.
The PET substrate is purchased from Yifeihai electronic technology, Inc.
The release layer is prepared from a non-silicon release agent.
The non-silicon release agent comprises a non-silicon release agent A and a non-silicon release agent B; the non-silicon release agent A is purchased from RL-600 of Meigu chemical Co., Ltd, Guangzhou; the non-silicon release agent B was purchased from PEELOIL 1010 of sequoia chemical (shanghai) ltd.
The weight ratio of the non-silicon mold release agent A to the non-silicon mold release agent B is 1: 0.8.
the glue layer is acrylate pressure-sensitive adhesive; the preparation raw materials of the acrylate pressure-sensitive adhesive comprise, by weight, 100 parts of acrylate adhesive, 1 part of curing agent, 85 parts of diluent, 5.5 parts of color paste and 11 parts of tackifying resin.
The acrylate-type adhesive was purchased from LOCTITE AA 3311 from the cis industrial mall.
The curing agent is aliphatic polyisocyanate; the aliphatic polyisocyanate was purchased from Shi Quanxing 3390 of Wuhan Shi Quanxing New materials science and technology GmbH.
The diluent is ethyl acetate.
The color paste is blue color paste and is purchased from Jiacai industry Co., Ltd, Dongguan city.
The tackifying resin comprises rosin resin and terpene phenol resin.
The rosin resin comprises a rosin resin A and a rosin resin B; rosin resin a was purchased from RE100F of asian sonna company; rosin resin B was purchased from RE80HP of asian sonna company.
The terpene phenol resin was purchased from TP96 of asian sangna company.
The weight ratio of the rosin resin A to the rosin resin B to the terpene-phenol resin is 1.2: 1: 1.2.
the preparation method of the acrylate pressure-sensitive adhesive comprises the following steps: adding an acrylate adhesive, a diluent, rosin resin A, rosin resin B, terpene phenol resin and color paste into a reaction kettle, stirring at the temperature of 27 ℃ at 800r/min for 1h, adding a curing agent, continuously stirring for 1h, standing and defoaming to obtain the acrylate pressure-sensitive adhesive.
The preparation method of the polyester film functional material comprises the following steps:
(1) the base material is subjected to bidirectional stretching and surface corona treatment, so that the surface tension of the glue coating surface of the base material reaches more than 42 dyne/cm;
(2) preparing a non-silicon release agent into a concentration of 1 wt%, and printing the non-silicon release agent on the back of a base material to enable the release force to reach 30g/25 mm;
(3) coating the acrylate pressure-sensitive adhesive on the adhesive-coated surface of the base material to obtain an adhesive layer, drying, coiling, rewinding and slitting to obtain the acrylic pressure-sensitive adhesive.
The coating mode in the step (3) is blade coating.
Example 2
The embodiment 2 of the invention provides a polyester film functional material, which comprises a release layer, a substrate layer and a glue layer from top to bottom; the substrate layer is a PET substrate.
The PET substrate is purchased from Yifeihai electronic technology, Inc.
The release layer is prepared from a non-silicon release agent.
The non-silicon release agent comprises a non-silicon release agent A and a non-silicon release agent B; the non-silicon release agent A is purchased from RL-600 of Meigu chemical Co., Ltd, Guangzhou; the non-silicon release agent B was purchased from PEELOIL 1010 of sequoia chemical (shanghai) ltd.
The weight ratio of the non-silicon mold release agent A to the non-silicon mold release agent B is 1: 1.
the glue layer is acrylate pressure-sensitive adhesive; the preparation raw materials of the acrylate pressure-sensitive adhesive comprise, by weight, 100 parts of acrylate adhesive, 1 part of curing agent, 85 parts of diluent, 5.5 parts of color paste and 11 parts of tackifying resin.
The acrylate-type adhesive was purchased from LOCTITE AA 3311 from the cis industrial mall.
The curing agent is aliphatic polyisocyanate; the aliphatic polyisocyanate was purchased from Shi Quanxing 3390 of Wuhan Shi Quanxing New materials science and technology GmbH.
The diluent is ethyl acetate.
The color paste is blue color paste and is purchased from Jiacai industry Co., Ltd, Dongguan city.
The tackifying resin comprises rosin resin and terpene phenol resin.
The rosin resin comprises a rosin resin A and a rosin resin B; rosin resin a was purchased from RE100F of asian sonna company; rosin resin B was purchased from RE80HP of asian sonna company.
The terpene phenol resin was purchased from TP96 of asian sangna company.
The weight ratio of the rosin resin A to the rosin resin B to the terpene-phenol resin is 1.4: 1: 1.4.
the preparation method of the acrylate pressure-sensitive adhesive comprises the following steps: adding an acrylate adhesive, a diluent, rosin resin A, rosin resin B, terpene phenol resin and color paste into a reaction kettle, stirring at the temperature of 27 ℃ at 800r/min for 1h, adding a curing agent, continuously stirring for 1h, standing and defoaming to obtain the acrylate pressure-sensitive adhesive.
The preparation method of the polyester film functional material comprises the following steps:
(1) the base material is subjected to bidirectional stretching and surface corona treatment, so that the surface tension of the glue coating surface of the base material reaches more than 42 dyne/cm;
(2) preparing a non-silicon release agent into a concentration of 1 wt%, and printing the non-silicon release agent on the back of a base material to enable the release force to reach 30g/25 mm;
(3) coating the acrylate pressure-sensitive adhesive on the adhesive-coated surface of the base material to obtain an adhesive layer, drying, coiling, rewinding and slitting to obtain the acrylic pressure-sensitive adhesive.
The coating mode in the step (3) is blade coating.
Example 3
Embodiment 3 of the present invention provides a functional material of a polyester film, which comprises a release layer, a substrate layer, and a glue layer from top to bottom; the substrate layer is a PET substrate.
The PET substrate is purchased from Yifeihai electronic technology, Inc.
The release layer is prepared from a non-silicon release agent.
The non-silicon release agent comprises a non-silicon release agent A and a non-silicon release agent B; the non-silicon release agent A is purchased from RL-600 of Meigu chemical Co., Ltd, Guangzhou; the non-silicon release agent B was purchased from PEELOIL 1010 of sequoia chemical (shanghai) ltd.
The weight ratio of the non-silicon mold release agent A to the non-silicon mold release agent B is 1: 0.9.
the glue layer is acrylate pressure-sensitive adhesive; the preparation raw materials of the acrylate pressure-sensitive adhesive comprise, by weight, 100 parts of acrylate adhesive, 1 part of curing agent, 85 parts of diluent, 5.5 parts of color paste and 11 parts of tackifying resin.
The acrylate-type adhesive was purchased from LOCTITE AA 3311 from the cis industrial mall.
The curing agent is aliphatic polyisocyanate; the aliphatic polyisocyanate was purchased from Shi Quanxing 3390 of Wuhan Shi Quanxing New materials science and technology GmbH.
The diluent is ethyl acetate.
The color paste is blue color paste and is purchased from Jiacai industry Co., Ltd, Dongguan city.
The tackifying resin comprises rosin resin and terpene phenol resin.
The rosin resin comprises a rosin resin A and a rosin resin B; rosin resin a was purchased from RE100F of asian sonna company; rosin resin B was purchased from RE80HP of asian sonna company.
The terpene phenol resin was purchased from TP96 of asian sangna company.
The weight ratio of the rosin resin A to the rosin resin B to the terpene-phenol resin is 1.3: 1: 1.3.
the preparation method of the acrylate pressure-sensitive adhesive comprises the following steps: adding an acrylate adhesive, a diluent, rosin resin A, rosin resin B, terpene phenol resin and color paste into a reaction kettle, stirring at the temperature of 27 ℃ at 800r/min for 1h, adding a curing agent, continuously stirring for 1h, standing and defoaming to obtain the acrylate pressure-sensitive adhesive.
The preparation method of the polyester film functional material comprises the following steps:
(1) the base material is subjected to bidirectional stretching and surface corona treatment, so that the surface tension of the glue coating surface of the base material reaches more than 42 dyne/cm;
(2) preparing a non-silicon release agent into a concentration of 1 wt%, and printing the non-silicon release agent on the back of a base material to enable the release force to reach 30g/25 mm;
(3) coating the acrylate pressure-sensitive adhesive on the adhesive-coated surface of the base material to obtain an adhesive layer, drying, coiling, rewinding and slitting to obtain the acrylic pressure-sensitive adhesive.
The coating mode in the step (3) is blade coating.
Comparative example 1
Comparative example 1 of the present invention provides a functional material of a polyester film, which is the same as example 3 in the specific embodiment, except that the weight ratio of the rosin resin a, the rosin resin B and the terpene-phenol resin is 1.3: 2: 1.3.
comparative example 2
Comparative example 2 of the present invention provides a functional material for polyester film, which is the same as example 3 except that the terpene-phenol resin has a softening point of 115 ℃ and is purchased from TRB115 of Adina corporation.
Comparative example 3
Comparative example 3 of the present invention provides a functional material of a polyester film, which is the same as example 3 except that rosin resin A is not present.
Comparative example 4
Comparative example 4 of the present invention provides a functional material of a polyester film, which is the same as example 3 except that rosin resin B is not present.
Comparative example 5
Comparative example 5 of the present invention provides a functional material of a polyester film, which is similar to example 3 except that no rosin resin a and no rosin resin B are present.
Comparative example 6
Comparative example 6 of the present invention provides a functional material for polyester film, which is the same as example 3 except that terpene-free phenol resin.
Comparative example 7
Comparative example 7 of the present invention provides a functional material of a polyester film, which is the same as example 3 in the specific embodiment, except that the weight ratio of the non-silicon release agent a to the non-silicon release agent B is 1: 2.
comparative example 8
Comparative example 8 of the present invention provides a functional material of a polyester film, which is the same as example 3 except that a non-silicon release agent B is not included.
Comparative example 9
Comparative example 9 of the present invention provides a functional material of a polyester film, which is the same as example 3 except that a non-silicon release agent a is not included.
Performance testing
1. Adhesion test
The polyester film functional materials prepared in the examples and the comparative examples are attached to a copper foil and an aluminum foil and soaked in electrolyte for 72 hours at 85 ℃, the use quality is detected, and the materials are qualified if the materials do not seep liquid, corrode, stick up edges, bulge or fade, are tightly attached and do not fall off; otherwise, the test is recorded as unqualified.
TABLE 1
Figure BDA0002713732970000121
Figure BDA0002713732970000131
As can be seen from the data in Table 1, the functional material of the polyester film prepared by the invention can be well applied to the fixation and insulation protection of the electrode lug and the termination part of the lithium ion battery cell, and can not cause the situations of liquid seepage, bulging, color fading and the like even if the functional material of the polyester film is attached to a copper foil and an aluminum foil and is soaked in an electrolyte at 85 ℃ for 72Hrs, and the functional material is tightly attached without falling off and has a long service life.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims (10)

1. A polyester film functional material is characterized by comprising a release layer, a substrate layer and a glue layer from top to bottom; the substrate layer is selected from any one of PET substrate, BOPP substrate, PI substrate.
2. The functional polyester film material according to claim 1, wherein the release layer is selected from one of non-silicon release agent, silicone release agent, fluorine release agent and UV release agent.
3. The functional polyester film material according to claim 1, wherein the non-silicon release agent comprises a non-silicon release agent A and a non-silicon release agent B.
4. The functional polyester film material as claimed in claim 3, wherein the melting point of the non-silicon release agent A is 87-95 ℃.
5. The functional polyester film material as claimed in claim 4, wherein the non-silicon release agent B has a dropping point of 83-86 ℃.
6. The functional material of polyester film according to claim 3 or 5, wherein the weight ratio of the non-silicon release agent A to the non-silicon release agent B is 1: (0.8 to 1).
7. The functional polyester film material as claimed in claim 1, wherein the glue layer is an acrylate pressure sensitive adhesive; the raw materials for preparing the acrylate pressure-sensitive adhesive comprise an acrylate adhesive, a curing agent, a diluent, color paste and tackifying resin.
8. The functional material of polyester film as claimed in claim 7, wherein the tackifying resin is selected from one or more of epoxy resin, rosin resin, terpene phenol resin and phenolic resin.
9. The method for preparing the functional material of polyester film according to any one of claims 1 to 8, characterized by comprising at least the following steps:
(1) the base material is subjected to bidirectional stretching and surface corona treatment, so that the surface tension of the glue coating surface of the base material reaches more than 42 dyne/cm;
(2) preparing a non-silicon release agent into a concentration of 0.25-2 wt%, and printing the non-silicon release agent on the back of a base material to enable the release force to reach 20-40 g/25 mm;
(3) coating the acrylate pressure-sensitive adhesive on the adhesive-coated surface of the base material to obtain an adhesive layer, drying, coiling, rewinding and slitting to obtain the acrylic pressure-sensitive adhesive.
10. The use of the functional polyester film material according to any one of claims 1 to 8, characterized in that the functional polyester film material is used for fixing and insulating the tab and the terminal of the lithium ion battery cell.
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