CN116285732A - Precoating film and preparation method and application thereof - Google Patents
Precoating film and preparation method and application thereof Download PDFInfo
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- CN116285732A CN116285732A CN202310287173.5A CN202310287173A CN116285732A CN 116285732 A CN116285732 A CN 116285732A CN 202310287173 A CN202310287173 A CN 202310287173A CN 116285732 A CN116285732 A CN 116285732A
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- film
- polyolefin
- adhesive
- precoating
- pet
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229920000098 polyolefin Polymers 0.000 claims abstract description 41
- 230000001070 adhesive effect Effects 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000000853 adhesive Substances 0.000 claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- -1 polyethylene terephthalate Polymers 0.000 claims abstract description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 3
- 239000011248 coating agent Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 17
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 12
- 150000008064 anhydrides Chemical class 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000002194 synthesizing effect Effects 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 239000011976 maleic acid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- OFNISBHGPNMTMS-UHFFFAOYSA-N 3-methylideneoxolane-2,5-dione Chemical compound C=C1CC(=O)OC1=O OFNISBHGPNMTMS-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- 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
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/06—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
- 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
-
- 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
- C09J2451/00—Presence of graft polymer
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a precoating film, a preparation method and application thereof, wherein a polyolefin adhesive is coated on pet (polyethylene terephthalate) through an online coating process, wherein a specific polyolefin adhesive is selected for use, and the prepared precoating film has the technical effects of high production efficiency, low cost, thinner precoating film, strong adhesive property, good corrosion resistance and the like.
Description
Technical Field
The invention relates to the technical field of lithium battery materials, in particular to a precoating film, a preparation method and application thereof.
Background
Under the normal condition of pet, the adhesion force and other corrosion resistance of pet can be increased by the way of coating polyolefin glue after the pet is stretched into a film, and the pet belongs to off-line coating, and the effect is achieved by taking the technical scheme into consideration. The off-line coating needs to stretch pet out firstly and then to coat the coating, the working procedure is composed of two steps, and the time-consuming precoating film which cannot be thinner exists; the on-line coating can be completed in one step, so that the cost is saved, and the on-line coating can be thinner. The present company solution was designed as an in-line coating solution for a one-step process.
At present, pet is coated on line, generally some coatings such as polyester, acrylic acid, silicone oil and the like are coated, the adhesive force of the coatings is increased, and the corrosion resistance of the coatings is poor, so that high-corrosion materials such as strong acid, strong alkali and electrolyte cannot be achieved. The company modifies the material and adopts polyolefin corrosion-resistant glue to achieve the effect of electrolyte corrosion resistance.
Disclosure of Invention
The invention aims to provide a preparation method of a precoating film, which realizes one-step preparation of the precoating film.
The invention is realized by the following technical scheme:
a method for producing a precoating film, comprising: the polyolefin adhesive is coated on pet (polyethylene terephthalate) by an in-line coating process.
The on-line coating process is to directly coat chemical substances on the film by an on-line coater on the production line of the film so as to enhance and improve the surface function and special physical and chemical indexes of the film and meet the use requirements of special products. The coated product, we generally refer to as a pre-coat film.
Further, in the in-line coating process, the stretching of the pet and the coating are completed in one step.
Further, the polyolefin adhesive is made of unsaturated polyolefin.
Further, the unsaturated polyolefin is synthesized from unsaturated carboxylic acid, anhydride thereof and olefin copolymer, and the weight average molecular weight of the adhesive of the unsaturated polyolefin is 3-30 ten thousand. The special adhesive is selected as coating, so that a good adhesive effect can be achieved, namely, if the molecular weight is lower than 3 ten thousand, the cohesive force is insufficient, and the adhesive force is insufficient in later use; if the molecular weight is higher than 30 ten thousand, it is difficult to maintain stable construction in the later stage. The unsaturated carboxylic acid and its anhydride are selected from one or more of maleic acid, fumaric acid, itaconic acid, maleic anhydride, fumaric anhydride, itaconic anhydride, acrylic acid, glycidyl methacrylate, and other low molecular weight compounds containing carboxylate or anhydride; the olefin copolymer is selected from olefin copolymers containing ethylene, propylene, butylene and other alpha-olefin components.
Further, the unsaturated polyolefin has an acid value of 1 to 300mgKOH/g resin, and a melting point Tm of more than 40 ℃ and less than 170 ℃. This range includes the acid number of the polyolefin backbone. If the acid value is less than the minimum value, there may be cases where the adhesion is poor, and if it is higher than the maximum value, there may be cases where the adhesion is severely reduced after the electrolyte resistance. The melting point is lower than 40 ℃, the crystallinity is low, the cohesion is poor, and the adhesion is insufficient; the temperature is preferably higher than 80 ℃, and the winding can be performed after the glue is used, so that the phenomenon of stickiness in the winding process is avoided; the melting point is higher than 170 ℃, the crystallinity is too high, the solution state cannot exist stably at normal temperature, and the solution still can be crystallized, so that the method cannot be industrially used.
Further, the polyolefin adhesive is solvent-based.
Specifically, the in-line coating process comprises the following steps:
s1, stretching a Pet film longitudinally on line;
s2, online coating of a polyolefin adhesive;
s4, preheating to 110-120 ℃;
s5.120-135 ℃ transverse stretching;
s6.210-230 ℃ shaping;
s7.100-30 ℃ cooling and rolling to obtain the BOPET film.
The precoating film prepared by the preparation method comprises a pet film and a polyolefin adhesive coated on the pet film.
Further, the pet film has a thickness of 3-12 microns. While off-line coating is difficult to achieve a pet film thickness of 6 microns, it is more difficult to achieve a pet film thickness of 3 microns.
Further, the polyolefin adhesive is coated to a thickness of 0.2 to 1 μm. It is difficult to uniformly coat polyolefin adhesives on pet films using off-line coating techniques, and 0.2 microns of 0.5 microns or less is achieved.
The precoating film is used for a battery current collector, meets corresponding technical indexes of the current collector, and has excellent electrolyte corrosion resistance.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
(1) The invention adopts on-line coating to prepare the precoating film, and has the technical effects of high production efficiency, low cost, thinner precoating film and the like;
(2) The precoating film prepared by using the polyolefin glue has good bonding performance and corrosion resistance.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated herein may be arranged and designed in a wide variety of different configurations.
The preparation method of the adhesive comprises the following steps:
the unsaturated carboxylic acid and the anhydride thereof are maleic acid, the olefin copolymer is an olefin copolymer containing ethylene, and the preparation method comprises the following steps: mixing 2 parts of maleic acid and 90 parts of olefin copolymer containing ethylene in a double-screw extruder, adding 0.1 part of peroxide, and grafting by adopting a screw melt grafting method at 260 ℃ to prepare an adhesive; the molecular weight of the adhesive is 15 ten thousand, the acid value of the polyolefin main chain in the adhesive is about 150mgKOH/g resin, and the melting point is 100 ℃. The specific adhesive is prepared by controlling the process conditions of raw material selection, raw material proportion, initiator consumption, reaction temperature and the like.
Example 1
A method for preparing a precoating film, comprising the steps of:
s1, stretching a Pet film longitudinally on line;
s2, synthesizing the adhesive of unsaturated polyolefin by using unsaturated carboxylic acid and anhydride thereof and olefin copolymer. Selecting a polyolefin adhesive with a weight average molecular weight of 3-30 ten thousand, an acid value of 1-300mgKOH/g and a melting point Tm of more than 40 ℃, and then performing online coating;
preheating at S4.110 ℃;
transversely stretching the coating at the temperature of S5.120 ℃;
shaping at S6.210 ℃;
cooling and rolling at the temperature of S7.100 ℃ to obtain the BOPET film.
The thickness of the BOPET film obtained was 6 μm.
Example 2
A method for preparing a precoating film, comprising the steps of:
s1, stretching a Pet film longitudinally on line;
s2, synthesizing the adhesive of unsaturated polyolefin by using unsaturated carboxylic acid and anhydride thereof and olefin copolymer. Selecting a polyolefin adhesive with a weight average molecular weight of 3-30 ten thousand, an acid value of 1-300mgKOH/g and a melting point Tm of more than 80 ℃, and then performing online coating;
s4.120 ℃ preheating;
transversely stretching the coating at the temperature of S5.130 ℃;
shaping at S6.220 ℃;
and cooling and rolling at the temperature of S7.50 ℃ to obtain the BOPET film.
The thickness of the BOPET film obtained was 5 μm.
Comparative example 1
An adhesive for unsaturated polyolefin is synthesized by unsaturated carboxylic acid and its anhydride and olefin copolymer. Selecting a polyolefin adhesive with a weight average molecular weight of 3-30 ten thousand, an acid value of 1-300mgKOH/g and a melting point Tm of more than 40 ℃, and then performing off-line coating on the Pet film to obtain a precoating film, wherein the thickness of the precoating film is 13 micrometers.
Comparative example 2
A method for preparing a precoating film, comprising the steps of:
s1, stretching a Pet film longitudinally on line;
s2, carrying out online coating by using a polyurethane mixed solution;
s4.120 ℃ preheating;
transversely stretching the coating at the temperature of S5.130 ℃;
shaping at S6.220 ℃;
and cooling and rolling at the temperature of S7.50 ℃ to obtain the BOPET film.
The thickness of the BOPET film obtained was 5 μm.
Comparative example 3
A method for preparing a precoating film, comprising the steps of:
s1, stretching a Pet film longitudinally on line;
s2, synthesizing the adhesive of unsaturated polyolefin by using unsaturated carboxylic acid and anhydride thereof and olefin copolymer. Selecting a polyolefin adhesive with the weight average molecular weight of 1 ten thousand and the acid value of 1-300mgKOH/g resin and the melting point Tm of more than 40 ℃, and then carrying out online coating;
preheating at S4.110 ℃;
transversely stretching the coating at the temperature of S5.120 ℃;
shaping at S6.210 ℃;
cooling and rolling at the temperature of S7.100 ℃ to obtain the BOPET film.
The thickness of the BOPET film obtained was 6 μm.
Comparative example 4
A method for preparing a precoating film, comprising the steps of:
s1, stretching a Pet film longitudinally on line;
s2, synthesizing the adhesive of unsaturated polyolefin by using unsaturated carboxylic acid and anhydride thereof and olefin copolymer. Selecting a polyolefin adhesive with a weight average molecular weight of 3-30 ten thousand, an acid value of 0.1mgKOH/g resin and a melting point Tm of more than 40 ℃, and then carrying out online coating;
preheating at S4.110 ℃;
transversely stretching the coating at the temperature of S5.120 ℃;
shaping at S6.210 ℃;
cooling and rolling at the temperature of S7.100 ℃ to obtain the BOPET film.
The thickness of the BOPET film obtained was 6 μm.
Comparative example 5
A method for preparing a precoating film, comprising the steps of:
s1, stretching a Pet film longitudinally on line;
s2, synthesizing the adhesive of unsaturated polyolefin by using unsaturated carboxylic acid and anhydride thereof and olefin copolymer. Selecting a polyolefin adhesive with the weight average molecular weight of 3-30 ten thousand, the acid value of 1-300mgKOH/g resin and the melting point Tm of 30 ℃, and then carrying out online coating;
preheating at S4.110 ℃;
transversely stretching the coating at the temperature of S5.120 ℃;
shaping at S6.210 ℃;
cooling and rolling at the temperature of S7.100 ℃ to obtain the BOPET film.
The thickness of the BOPET film obtained was 6 μm.
The precoated film was used for a current collector and then subjected to performance test, and the results are shown in table 1:
therefore, the specific polyolefin binder has the technical effects of high production efficiency, low cost, thinner precoated film, strong adhesive property, good corrosion resistance and the like by coating the Pet film on line.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for producing a precoating film, comprising: the polyolefin adhesive is coated on pet (polyethylene terephthalate) by an in-line coating process.
2. The method for preparing a precoating film according to claim 1, wherein in the on-line coating process, the stretching of pet and the coating are completed in one step.
3. The method for preparing a precoating film according to claim 1, wherein the polyolefin adhesive is an unsaturated polyolefin.
4. The method for preparing a precoating film according to claim 3, wherein the unsaturated polyolefin is synthesized from unsaturated carboxylic acid, anhydride thereof and olefin copolymer, and the weight average molecular weight of the adhesive of the unsaturated polyolefin is 3 to 30 ten thousand.
5. The method for producing a precoating film according to claim 3 or 4, wherein the unsaturated polyolefin has an acid value of 1 to 300mgKOH/g resin, and a melting point Tm of more than 40 ℃ and less than 170 ℃.
6. The method for producing a precoating film according to any one of claims 1 to 4, wherein the polyolefin adhesive is solvent-borne or water-borne.
7. The method for preparing a precoating film according to claim 1, wherein the on-line coating process comprises the steps of:
s1, stretching a Pet film longitudinally on line;
s2, online coating of a polyolefin adhesive;
s4, preheating to 110-120 ℃;
s5.120-135 ℃ transverse stretching;
s6.210-230 ℃ shaping;
s7.100-30 ℃ cooling and rolling to obtain the BOPET film.
8. A precoating film produced by the production method according to any one of claims 1 to 7, characterized by comprising a pet film and a polyolefin adhesive coated on the pet film.
9. The precoating film according to claim 8, wherein said pet film has a thickness of 3-12 microns; the polyolefin adhesive is coated to a thickness of 0.2-1 micron.
10. Use of a pre-coated film according to claim 9, characterized in that the pre-coated film is used for a battery current collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310287173.5A CN116285732A (en) | 2023-03-23 | 2023-03-23 | Precoating film and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310287173.5A CN116285732A (en) | 2023-03-23 | 2023-03-23 | Precoating film and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116285732A true CN116285732A (en) | 2023-06-23 |
Family
ID=86795687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310287173.5A Pending CN116285732A (en) | 2023-03-23 | 2023-03-23 | Precoating film and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116285732A (en) |
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2023
- 2023-03-23 CN CN202310287173.5A patent/CN116285732A/en active Pending
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