CN113462303A - High-corrosion-resistance electronic adhesive tape for lithium battery and preparation method thereof - Google Patents
High-corrosion-resistance electronic adhesive tape for lithium battery and preparation method thereof Download PDFInfo
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- CN113462303A CN113462303A CN202110780158.5A CN202110780158A CN113462303A CN 113462303 A CN113462303 A CN 113462303A CN 202110780158 A CN202110780158 A CN 202110780158A CN 113462303 A CN113462303 A CN 113462303A
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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
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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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
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
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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
- C09J7/20—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
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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
- C09J7/20—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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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- 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
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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
- 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
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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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
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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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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- 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 Kinetics & Catalysis (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Abstract
The invention discloses a high-corrosion-resistance electronic adhesive tape for a lithium battery, which is composed of the following raw materials: the electronic adhesive tape comprises an adhesive main material, a modifier, a solvent and a base film, wherein the adhesive main material is mixed and modified by the modifier in the solvent and then coated on the base film to obtain the electronic adhesive tape; the main material of the adhesive is polyester acrylate; the modifier comprises: polyether acrylates, electrolyte resistant modifiers, styrene-indene resins, neopentyl glycol diglycidyl ether, triallyl isocyanurate and diallyl phthalate. The high-corrosion-resistance electronic tape for the lithium battery is applied to the processing of the lithium battery, is less influenced by the electrolyte of the lithium battery, has better initial viscosity and peel strength, can keep excellent high-temperature resistance, aging resistance and electrolyte resistance in the electrolyte on the basis of keeping excellent mechanical strength and realizing the basic gluing effect of the electronic tape, can not fall off or dissolve in an extreme lithium battery electrolyte soaking environment for a long time, and keeps stable performance.
Description
Technical Field
The invention relates to the technical field of electronic tapes, in particular to a high-corrosion-resistance electronic tape for a lithium battery and a preparation method thereof.
Background
The electronic adhesive tape is a consumable material frequently used in the process of fixing and installing electronic components, electronic products are continuously updated along with the development of science and technology, and the requirements on the used electronic adhesive tape are higher and higher. In the lithium cell production process, the electronic adhesive tape is also an indispensable consumptive material, and it is fixed mainly to be applied to insulating protection, the encapsulation of the outside positive negative pole lead wire of battery and circuit in the lithium cell production process, and the electric core terminates the fixed seepage of placing electrolyte of end insulation, battery tab insulation protection etc.. The electronic adhesive tape plays an important role in the production process of the lithium battery.
At present, the electronic adhesive tape applied to the processing process of the lithium battery mostly adopts the acrylic ester electronic adhesive tape. Acrylate is a raw material which is widely applied in the field of adhesives, has the advantages of easily available raw materials, relatively good stability, simple process and the like, but also has the defects of poor solvent resistance, poor water resistance, easy stickiness at high temperature, easy embrittlement at low temperature and the like, so that an acrylate monomer is rarely directly adopted as an adhesive for use, and is mixed with other raw materials to modify acrylate to obtain an adhesive with more excellent performance so as to meet different use requirements. For the electronic adhesive tape applied to the processing of the lithium battery, the electronic adhesive tape is required to have proper viscosity and better high-temperature resistance and aging resistance, and can keep stable performance for a long time in an extreme lithium battery electrolyte environment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an electrolyte-resistant high-corrosion-resistance electronic adhesive tape for a lithium battery, and simultaneously provides a preparation method of the electronic adhesive tape.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high corrosion resistance electronic tape for a lithium battery, comprising: the electronic adhesive tape comprises an adhesive main material, a modifier, a solvent and a base film, wherein the adhesive main material is mixed and modified by the modifier in the solvent and then coated on the base film to obtain the electronic adhesive tape;
the main material of the adhesive is polyester acrylate;
the modifier comprises: polyether acrylates, electrolyte resistant modifiers, styrene-indene resins, neopentyl glycol diglycidyl ether, triallyl isocyanurate and diallyl phthalate.
Preferably, the adhesive main material, the solvent and the modifier comprise the following raw materials in parts by weight: 100 parts of polyester acrylate, 10-30 parts of polyether acrylate, 10-20 parts of electrolyte-resistant modifier, 5-10 parts of styrene-indene resin, 1-5 parts of neopentyl glycol diglycidyl ether, 180 parts of solvent 130-acrylate, 0.5-2 parts of triallyl isocyanurate and 0-2 parts of diallyl phthalate.
Preferably, the electrolyte-resistant modifier is a composite of dodecafluoroheptyl methacrylate and modified lac resin, wherein the mass ratio of the dodecafluoroheptyl methacrylate to the modified lac resin is 2-4: 1.
Preferably, the modified shellac resin is shellac resin modified by methyl methacrylate, and the preparation method of the modified shellac resin is as follows: the mass ratio of the lac resin to the methyl methacrylate is 3-5: 2, potassium permanganate is used as an initiator, the concentration of the initiator is 0.0005-0.002mol/L, and the modified lac resin is obtained after reaction for 2-3h at the temperature of 42-45 ℃.
Preferably, the solvent is 2-butanone and toluene, and the mass part ratio of the solvent to the toluene is 1-2: 1.
Preferably, the base film is a mylar film, a PI film, or a PET film.
The preparation method of the high-corrosion-resistance electronic adhesive tape for the lithium battery comprises the following steps of:
(1) placing polyester acrylate, polyether acrylate, an electrolyte-resistant modifier, styrene-indene resin, neopentyl glycol diglycidyl ether and a part of solvent in a reaction vessel according to the formula weight, and heating to a specified temperature under a stirring state;
(2) uniformly mixing triallyl isocyanurate and diallyl phthalate with the rest of solvent, dropwise adding the solvent mixed with triallyl isocyanurate and diallyl phthalate into the reaction container in the step (1) within a certain time, keeping the heat preservation and stirring state of the reaction container in the process of adding the solvent, and continuously keeping the heat preservation and stirring state of the reaction container for a certain time after dropwise adding is finished, and then cooling to obtain the adhesive material;
(3) and (3) uniformly coating the adhesive obtained in the step (2) on a base film, and drying at a certain temperature to obtain the electronic adhesive tape.
Preferably, the process conditions in the preparation method of the high corrosion resistance electronic adhesive tape for the lithium battery are controlled as follows: in the step (1), part of solvent is 1/2-2/3 of the total amount of the solvent, and the temperature is controlled to be raised to 70-80 ℃; the time for dripping the solvent in the step (2) is controlled to be 1-2h, and the holding time after finishing dripping is 2-3 h; the drying temperature in the step (3) is 60-80 ℃, and the thickness of the prepared electronic adhesive tape dry glue is 30 +/-5 mu m.
In the invention, the main material of the adhesive is the main material of the adhesive performance of the electronic adhesive tape, and the mechanical property, the electrolyte resistance, the thermal stability and the aging resistance of the electronic adhesive tape are determined, the polyester acrylate is used as the main material, has good electrolyte resistance, and the property determines that the polyester acrylate can show good high corrosion resistance when being used as the raw material of the electronic adhesive tape for the lithium battery, but the mechanical property of the polyester acrylate is not good, and the polyester ester group has stronger polarity and is easy to react with the electrolyte resistance modifier and the neopentyl glycol diglycidyl ether to form hydrogen bonds to increase the strength, so that a chain-shaped structure and a net-shaped structure are formed when the finished product adhesive is cured, and the mechanical properties of the finished product adhesive, such as tensile strength, bending strength, compressive strength, impact strength and the like, are improved; the lac resin can improve the mechanical property of the sizing material, but the lac resin is rich in free hydroxyl and carboxyl, and has poor weather resistance, heat resistance and aging resistance, the lac resin modified by methyl methacrylate graft copolymerization can improve the defects, so that the modified lac resin shows excellent mechanical properties such as tensile property, and the like, and simultaneously, the aging resistance, the heat resistance and the solvent resistance are obviously improved, so that the lac resin can be blended with the dodecafluoroheptyl methacrylate to be used as an electrolyte-resistant modifier of the adhesive main material. The bond energy of C-F bonds in the fluorine-containing methacrylic acid dodecafluoroheptyl ester is large, the stability is high, fluorine atoms are closely and regularly arranged around a carbon chain, a good shielding effect is achieved on a carbon main chain, the carbon atoms and the carbon chain are prevented from being exposed, the polymer shows good surface performance and chemical stability, and the polymer has excellent chemical medium resistance, corrosion resistance and weather resistance. The polyether acrylate has good flexibility and yellowing resistance, can effectively adjust the toughness strength of a sizing material finished product, and overcomes the defect of poor yellowing resistance of the sizing material caused by the main material of the polyester acrylate. The styrene-indene resin has good tackifying effect and softening effect, can offset the hard brittleness of the modified lac resin, improves the viscosity, strength and extensibility of the finished rubber material, has better initial viscosity and viscosity maintenance of the rubber material, and has no adverse effect on the physical and mechanical properties of the rubber material.
Compared with the prior art, the invention has the beneficial effects that:
the high-corrosion-resistance electronic tape for the lithium battery is applied to the processing of the lithium battery, is less influenced by the electrolyte of the lithium battery, has better initial viscosity and peel strength, can keep excellent high-temperature resistance, aging resistance and electrolyte resistance in the electrolyte on the basis of keeping excellent mechanical strength and realizing the basic gluing effect of the electronic tape, can not fall off or dissolve in an extreme lithium battery electrolyte soaking environment for a long time, and keeps stable performance.
Detailed Description
The technical solutions of the present invention will be further described below with reference to specific embodiments, and it is apparent that the described embodiments are only a part of examples, but not all examples of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Example 1: a high corrosion resistance electronic tape for a lithium battery, comprising: the electronic adhesive tape comprises an adhesive main material, a modifier, a solvent and a base film, wherein the adhesive main material is mixed and modified by the modifier in the solvent and then coated on the base film to obtain the electronic adhesive tape;
the main material of the adhesive is polyester acrylate; the modifier comprises: polyether acrylates, electrolyte resistant modifiers, styrene-indene resins, neopentyl glycol diglycidyl ether, triallyl isocyanurate and diallyl phthalate.
Further, the adhesive main material and the modifier comprise the following raw materials in parts by weight: 100 parts of polyester acrylate, polyether acrylate: 20 parts of electrolyte-resistant modifier, 15 parts of styrene-indene resin, 3 parts of neopentyl glycol diglycidyl ether, 155 parts of solvent, 1.2 parts of triallyl isocyanurate and 1 part of diallyl phthalate.
Further, the electrolyte-resistant modifier is a compound of dodecafluoroheptyl methacrylate and modified lac resin, wherein the mass ratio of the dodecafluoroheptyl methacrylate to the modified lac resin is 3: 1.
Further, the modified lac resin is a lac resin modified by methyl methacrylate, and the preparation method of the modified lac resin comprises the following steps: the mass ratio of the lac resin to the methyl methacrylate is 2: 1, potassium permanganate is used as an initiator, the concentration of the initiator is 0.001mol/L, and the modified lac resin is obtained after reaction for 2.5h at the temperature of 43 ℃.
Further, the solvent is 2-butanone and toluene, and the mass part ratio of the solvent to the toluene is 3: 2; the base film is a polyester film.
Example 2: the high-corrosion-resistance electronic adhesive tape for the lithium battery is different from the electronic adhesive tape in example 1 in that the adhesive main material and the modifier comprise the following raw materials in parts by weight: 100 parts of polyester acrylate, 10 parts of polyether acrylate, 10 parts of electrolyte-resistant modifier, 5 parts of styrene-indene resin, 1 part of neopentyl glycol diglycidyl ether, 130 parts of solvent and 0.5 part of triallyl isocyanurate.
Further, the electrolyte-resistant modifier is a compound of dodecafluoroheptyl methacrylate and modified lac resin, wherein the mass ratio of the dodecafluoroheptyl methacrylate to the modified lac resin is 2: 1.
Further, the modified lac resin is a lac resin modified by methyl methacrylate, and the preparation method of the modified lac resin comprises the following steps: the mass ratio of the lac resin to the methyl methacrylate is 3: 2, potassium permanganate is used as an initiator, the concentration of the initiator is 0.0005mol/L, and the modified lac resin is obtained after reaction for 3h at 42 ℃.
Further, the solvent is 2-butanone and toluene, and the mass part ratio of the solvent to the toluene is 1: 1; the base film is a PI film.
Example 3: the high-corrosion-resistance electronic adhesive tape for the lithium battery is different from the electronic adhesive tape in example 1 in that the adhesive main material and the modifier comprise the following raw materials in parts by weight: 100 parts of polyester acrylate, 30 parts of polyether acrylate, 20 parts of electrolyte-resistant modifier, 10 parts of styrene-indene resin, 5 parts of neopentyl glycol diglycidyl ether, 180 parts of solvent, 2 parts of triallyl isocyanurate and 2 parts of diallyl phthalate.
Further, the electrolyte-resistant modifier is a compound of dodecafluoroheptyl methacrylate and modified lac resin, wherein the mass ratio of the dodecafluoroheptyl methacrylate to the modified lac resin is 4: 1.
Further, the modified lac resin is a lac resin modified by methyl methacrylate, and the preparation method of the modified lac resin comprises the following steps: the mass ratio of the lac resin to the methyl methacrylate is 5: 2, potassium permanganate is used as an initiator, the concentration of the initiator is 0.002mol/L, and the modified lac resin is obtained after reaction for 2 hours at the temperature of 45 ℃.
Further, the solvent is 2-butanone and toluene, and the mass part ratio of the solvent to the toluene is 2: 1; the base film is a PET film.
Example 4: the high-corrosion-resistance electronic adhesive tape for the lithium battery is different from the electronic adhesive tape in example 1 in that the adhesive main material and the modifier comprise the following raw materials in parts by weight: 100 parts of polyester acrylate, 30 parts of polyether acrylate, 10 parts of electrolyte-resistant modifier, 10 parts of styrene-indene resin, 1 part of neopentyl glycol diglycidyl ether, 180 parts of solvent, 0.5 part of triallyl isocyanurate and 2 parts of diallyl phthalate.
Further, the electrolyte-resistant modifier is a compound of dodecafluoroheptyl methacrylate and modified lac resin, wherein the mass ratio of the dodecafluoroheptyl methacrylate to the modified lac resin is 2: 1.
Further, the modified lac resin is a lac resin modified by methyl methacrylate, and the preparation method of the modified lac resin comprises the following steps: the mass ratio of the lac resin to the methyl methacrylate is 5: 2, potassium permanganate is used as an initiator, the concentration of the initiator is 0.0005mol/L, and the modified lac resin is obtained after reaction for 2h at 45 ℃.
Further, the solvent is 2-butanone and toluene, and the mass part ratio of the solvent to the toluene is 2: 1; the base film is a polyester film.
Example 5: the high-corrosion-resistance electronic adhesive tape for the lithium battery is different from the electronic adhesive tape in example 1 in that the adhesive main material and the modifier comprise the following raw materials in parts by weight: 100 parts of polyester acrylate, 15 parts of polyether acrylate, 18 parts of electrolyte-resistant modifier, 6 parts of styrene-indene resin, 4 parts of neopentyl glycol diglycidyl ether, 140 parts of solvent, 1.5 parts of triallyl isocyanurate and 0.5 part of diallyl phthalate.
Further, the electrolyte-resistant modifier is a compound of dodecafluoroheptyl methacrylate and modified lac resin, wherein the mass ratio of the dodecafluoroheptyl methacrylate to the modified lac resin is 5: 2.
Further, the modified lac resin is a lac resin modified by methyl methacrylate, and the preparation method of the modified lac resin comprises the following steps: the mass ratio of the lac resin to the methyl methacrylate is 9: 4, potassium permanganate is used as an initiator, the concentration of the initiator is 0.0015mol/L, and the modified lac resin is obtained after reaction for 2 hours at 44 ℃.
Further, the solvent is 2-butanone and toluene, and the mass part ratio of the solvent to the toluene is 2: 1; the base film is a polyester film.
Comparative example 1: a highly corrosion-resistant electronic tape for a lithium battery, which is different from example 1 in that it does not contain an electrolyte-resistant modifier.
Comparative example 2: a highly corrosion-resistant electronic tape for a lithium battery, which does not contain styrene-indene resin, unlike example 1.
Comparative example 3: a highly corrosion-resistant electronic tape for a lithium battery, which is different from example 1 in that polyether acrylate and polyester acrylate are replaced with the same parts by weight of acrylate.
The preparation method of the high-corrosion-resistance electronic adhesive tape for the lithium battery comprises the following steps of:
(1) placing polyester acrylate, polyether acrylate, an electrolyte-resistant modifier, styrene-indene resin, neopentyl glycol diglycidyl ether and a part of solvent in a reaction vessel according to the formula weight, and heating to a specified temperature under a stirring state;
(2) uniformly mixing triallyl isocyanurate and diallyl phthalate with the rest of solvent, dropwise adding the solvent mixed with triallyl isocyanurate and diallyl phthalate into the reaction container in the step (1) within a certain time, keeping the heat preservation and stirring state of the reaction container in the process of adding the solvent, and continuously keeping the heat preservation and stirring state of the reaction container for a certain time after dropwise adding is finished, and then cooling to obtain the adhesive material;
(3) and (3) uniformly coating the adhesive obtained in the step (2) on a base film, and drying at a certain temperature to obtain the electronic adhesive tape.
Preferably, the process conditions in the preparation method of the high corrosion resistance electronic adhesive tape for the lithium battery are controlled as follows: in the step (1), part of solvent is 1/2-2/3 of the total amount of the solvent, and the temperature is controlled to be increased to 75 ℃; the time for dripping the solvent in the step (2) is controlled to be 1.5h, and the retention time after dripping is 2.5 h; the drying temperature in the step (3) is 70 ℃, and the thickness of the prepared electronic adhesive tape dry glue is 30 +/-5 mu m.
And (3) performance testing: the electronic tape products obtained in the above examples 1 to 5 and comparative examples 1 to 3 were subjected to the performance test under the identical conditions, and the results are shown in the following table.
The soaking conditions are as follows: soaking in lithium ion electrolyte at 80 deg.C for 72 h.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The high-corrosion-resistance electronic adhesive tape for the lithium battery is characterized by comprising the following raw materials: the electronic adhesive tape comprises an adhesive main material, a modifier, a solvent and a base film, wherein the adhesive main material is mixed and modified by the modifier in the solvent and then coated on the base film to obtain the electronic adhesive tape;
the main material of the adhesive is polyester acrylate;
the modifier comprises: polyether acrylates, electrolyte resistant modifiers, styrene-indene resins, neopentyl glycol diglycidyl ether, triallyl isocyanurate and diallyl phthalate.
2. The high corrosion resistance electronic tape for a lithium battery as claimed in claim 1, wherein: the adhesive comprises the following raw materials in parts by weight: 100 parts of polyester acrylate, 10-30 parts of polyether acrylate, 10-20 parts of electrolyte-resistant modifier, 5-10 parts of styrene-indene resin, 1-5 parts of neopentyl glycol diglycidyl ether, 180 parts of solvent 130-acrylate, 0.5-2 parts of triallyl isocyanurate and 0-2 parts of diallyl phthalate.
3. The high corrosion resistance electronic tape for a lithium battery as claimed in claim 1 or 2, wherein: the electrolyte-resistant modifier is a compound of decafluoroheptyl methacrylate and modified lac resin, wherein the mass ratio of the dodecafluoroheptyl methacrylate to the modified lac resin is 2-4: 1.
4. The high corrosion resistance electronic tape for a lithium battery as claimed in claim 3, wherein: the modified lac resin is lac resin modified by methyl methacrylate, and the preparation method of the modified lac resin comprises the following steps: the mass ratio of the lac resin to the methyl methacrylate is 3-5: 2, potassium permanganate is used as an initiator, the concentration of the initiator is 0.0005-0.002mol/L, and the modified lac resin is obtained after reaction for 2-3h at the temperature of 42-45 ℃.
5. The high corrosion resistance electronic tape for a lithium battery as claimed in claim 1 or 2, wherein: the solvent is 2-butanone and toluene, and the mass ratio of the solvent to the toluene is 1-2: 1.
6. The high corrosion resistance electronic tape for a lithium battery as claimed in claim 1, wherein: the base film is a polyester film, a PI film or a PET film.
7. The method for preparing a highly corrosion-resistant electronic tape for a lithium battery as claimed in any one of claims 1 to 6, comprising the steps of:
(1) placing polyester acrylate, polyether acrylate, an electrolyte-resistant modifier, styrene-indene resin, neopentyl glycol diglycidyl ether and a part of solvent in a reaction vessel according to the formula weight, and heating to a specified temperature under a stirring state;
(2) uniformly mixing triallyl isocyanurate and diallyl phthalate with the rest of solvent, dropwise adding the solvent mixed with triallyl isocyanurate and diallyl phthalate into the reaction container in the step (1) within a certain time, keeping the heat preservation and stirring state of the reaction container in the process of adding the solvent, and continuously keeping the heat preservation and stirring state of the reaction container for a certain time after dropwise adding is finished, and then cooling to obtain the adhesive material;
(3) and (3) uniformly coating the adhesive obtained in the step (2) on a base film, and drying at a certain temperature to obtain the electronic adhesive tape.
8. The method for preparing the high corrosion resistance electronic tape for a lithium battery as claimed in claim 7, wherein: the preparation method of the high-corrosion-resistance electronic adhesive tape for the lithium battery comprises the following steps: in the step (1), part of solvent is 1/2-2/3 of the total amount of the solvent, and the temperature is controlled to be raised to 70-80 ℃; the time for dripping the solvent in the step (2) is controlled to be 1-2h, and the holding time after finishing dripping is 2-3 h; the drying temperature in the step (3) is 60-80 ℃, and the thickness of the prepared electronic adhesive tape dry glue is 30 +/-5 mu m.
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| CN113462303B (en) | 2023-04-11 |
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