CN216584834U - BOPP (biaxially-oriented polypropylene) base film for adhesive tape and lithium battery protection adhesive tape applying BOPP base film - Google Patents
BOPP (biaxially-oriented polypropylene) base film for adhesive tape and lithium battery protection adhesive tape applying BOPP base film Download PDFInfo
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Abstract
The utility model provides a BOPP (biaxially-oriented polypropylene) base film for an adhesive tape and a lithium battery protection adhesive tape applying the BOPP base film. This BOPP base film for sticky tape includes two surfaces of setting up back to back, one of them form on the surface and be used for with the compound corona face of glue film, another form on the surface be used for with from the compound non-corona face of type layer. Carry out corona treatment to BOPP base film one side and can improve the surface energy of BOPP base film, and then improve the adhesive force between BOPP base film and the glue film, non-corona surface coating is from type layer then can play the guard action to the BOPP base film for the BOPP base film has good high temperature resistance ability, prevents the adhesion. The BOPP base film for the adhesive tape is applied to the lithium battery protective adhesive tape, and can solve the problems of warping, foaming, degumming and adhesion in the using process of the traditional protective adhesive tape.
Description
Technical Field
The utility model relates to the technical field of protective film adhesive tapes, in particular to a BOPP (biaxially-oriented polypropylene) base film for an adhesive tape and a lithium battery protective adhesive tape using the same.
Background
The protective adhesive tape is an adhesive tape used for surface protection in the production, assembly and transportation processes of electronic devices, particularly in the procedures of electrode winding, pole piece protection, core protection and the like of lithium batteries, and is usually a pressure-sensitive adhesive tape. The pressure-sensitive adhesive tape is characterized by easy adhesion, easy removal and no damage by peeling. The protective adhesive tape has the general performance of the pressure-sensitive adhesive tape, and has special requirements on aspects such as substrate selection, adhesion, chemical resistance and the like, and is a special pressure-sensitive adhesive product.
Tapes generally comprise a substrate layer and an adhesive layer. At present, in the research on adhesive tapes for protecting lithium batteries during production and assembly processes, the research on adhesive layers is mainly focused, the focus is on whether the peeling force and the peeling process are degummed and adhered, but the research on substrate layers for realizing the protection effect is less. The conventional lithium battery protection adhesive tape mostly adopts a PET (polyethylene terephthalate) or BOPP (biaxially-oriented polypropylene) material as a base material layer, but the PET material is hard, and has the problems that edges and corners are easy to warp and bubble marks are easy to generate; the BOPP material has the problems of degumming and back adhesion in the protection process through vacuum baking.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a BOPP (biaxially-oriented polypropylene) base film for an adhesive tape and a lithium battery protection adhesive tape applying the BOPP base film, and aims to solve the problems of warping, foaming, degumming and adhesion in the using process of the traditional adhesive tape.
According to a first aspect of the present invention, there is provided a BOPP-based film for tape, comprising two oppositely disposed surfaces, wherein one surface is formed with a corona side for lamination with a glue layer, and the other surface is formed with a non-corona side for lamination with a release layer.
Compared with a PET (polyethylene terephthalate) base film, the BOPP base film for the adhesive tape is a biaxially oriented polypropylene film, is not easy to warp and bubble, one surface of the BOPP base film is subjected to corona treatment (corona surface), the other surface of the BOPP base film is not subjected to corona treatment (non-corona surface), the corona surface of the BOPP base film is used for being compounded with an adhesive layer, and the non-corona surface is used for being compounded with a release layer. BOPP base film has low surface energy, the glue film has high surface energy, its surface energy improves after the corona treatment of BOPP base film, be favorable to improving the adhesive force between BOPP substrate and the glue film, can solve the problem of coming unstuck, and the one side of the BOPP base film that does not have the corona treatment has low surface energy, also have low surface energy from the type layer, make to compound mutually with the non-corona face of BOPP base film more easily from the type layer, it plays the guard action to the base film at BOPP base film surface to adhere to from the type layer, make BOPP base film have good high temperature resistance, can solve the adhesion problem that the BOPP base film appears in the use.
According to a second aspect of the utility model, a lithium battery protection tape is provided, which comprises the BOPP base film, and further comprises an adhesive layer and a release layer, wherein the adhesive layer is compounded with the corona surface of the BOPP base film, and the release layer is compounded with the non-corona surface of the BOPP base film.
Preferably, the subbing layer comprises a primer layer which is compounded with the corona side of the BOPP base film.
Preferably, the base coat is prepared from a modified chlorinated polyolefin. The adhesive force of the adhesive layer and the BOPP base film can be effectively improved by the aid of the base coat, and the problem of degumming is further solved.
Preferably, the thickness of the primer layer is 0.05 to 1 μm.
Preferably, the glue layer further comprises an adhesive layer, and the release layer, the BOPP base film, the bottom coating and the adhesive layer are sequentially compounded.
Preferably, the thickness of the release layer is 0.05-1 μm
Preferably, the thickness of the BOPP-based film is 50-65 μm
Preferably, the adhesive layer has a thickness of 9 to 15 μm.
Preferably, the release layer is prepared from the following raw materials in parts by weight: 8 parts of hexafunctional group urethane acrylate, 10 parts of modified urethane acrylate, 2 parts of nine-functional group urethane acrylate, 2.5 parts of organic silicon monomer, 2.5 parts of photoinitiator and 75 parts of diluent.
Preferably, the modified urethane acrylate is at least one selected from dimethyl siloxane modified urethane acrylate and fluorocarbon modified urethane acrylate.
Preferably, the modified urethane acrylate is a dimethylsiloxane modified urethane acrylate.
Preferably, the photoinitiator includes photoinitiator 1173 and photoinitiator 184.
Preferably, the diluent is selected from at least one of ethanol, isopropanol, ethyl ester, toluene, acetone, butanone.
Preferably, the lithium battery protection tape is prepared by the following method: selecting a BOPP base film with a certain thickness, carrying out corona treatment on one surface of the BOPP base film to obtain a corona surface, carrying out corona treatment on the other surface of the BOPP base film without corona treatment to obtain a non-corona surface, coating a release layer on the non-corona surface, and sequentially coating a bottom coating and an adhesive layer on the corona surface after curing to obtain the lithium battery protection adhesive tape.
The utility model has the beneficial effects that: the utility model provides a BOPP base film for adhesive tapes, which is a biaxially oriented polypropylene film and can avoid warping and foaming, one surface of the BOPP base film is subjected to corona treatment (corona surface) and the other surface is not subjected to corona treatment (non-corona surface), the corona surface is coated with an adhesive layer, so that the adhesive force between the BOPP base film and the adhesive layer can be improved, the degumming problem can be solved, the non-corona surface is coated with a release layer, the surface of the BOPP base film is protected, the BOPP base film has excellent high temperature resistance, and the BOPP base film can be prevented from being adhered at high temperature. The BOPP base film is applied to a lithium battery protection adhesive tape, wherein the adhesive layer comprises a bottom coating and an adhesive layer, the use of the bottom coating can further improve the adhesive force between the BOPP base film and the adhesive layer, and the degumming risk is further reduced. Therefore, when the BOPP base film for the adhesive tape is used in the lithium battery protection adhesive tape, the problems of warping, foaming, degumming and adhesion in the use process of the traditional protection adhesive tape can be solved.
Drawings
Fig. 1 is a schematic structural view of a protective tape for a lithium battery according to the present invention.
The reference signs are: 1 release layer, 2 base film layer, 3 bottom coating layer and 4 adhesive layer.
Detailed Description
Technical features in the technical solutions provided by the present invention are further clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 60-micron BOPP base film as a base film layer 2, carrying out corona treatment on one surface of the base film layer 2, wherein the corona treatment is called a corona surface, and the other surface of the base film layer 2 is not subjected to corona treatment and is called a non-corona surface;
(2) uniformly mixing 8 parts of hexafunctional group urethane acrylate, 10 parts of dimethyl siloxane modified urethane acrylate, 2 parts of nine-functional group urethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on a non-corona surface of a BOPP base film, and carrying out UV (ultraviolet) curing to obtain a release layer 1;
(3) preparing a primer by using modified chlorinated polyolefin, and coating the primer on the corona surface of the BOPP base film to obtain a primer 3;
(4) coating acrylic glue on the bottom coating to obtain an adhesive layer 4, and drying to obtain the lithium battery protection adhesive tape with the structure shown in figure 1;
the thickness of the release layer is 0.05 μm;
the thickness of the primer layer was 0.05 μm;
the thickness of the adhesive layer was 12 μm.
Example 2
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 50-micron BOPP base film as a base film layer 2, carrying out corona treatment on one surface of the base film layer 2, wherein the corona treatment is called a corona surface, and the other surface of the base film layer 2 is not subjected to corona treatment and is called a non-corona surface;
(2) uniformly mixing 8 parts of hexafunctional group urethane acrylate, 10 parts of dimethyl siloxane modified urethane acrylate, 2 parts of nine-functional group urethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on a non-corona surface of a BOPP base film, and carrying out UV (ultraviolet) curing to obtain a release layer 1;
(3) preparing a primer by utilizing modified chlorinated polyolefin, and coating the primer on the corona surface of the BOPP base film to obtain a primer layer 3;
(4) coating acrylic glue on the bottom coating to obtain an adhesive layer 4, and drying to obtain the lithium battery protection adhesive tape with the structure shown in figure 1;
the thickness of the release layer is 1 mu m;
the thickness of the primer layer is 1 μm;
the thickness of the adhesive layer was 9 μm.
Example 3
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 65-micron BOPP base film as a base film layer 2, carrying out corona treatment on one surface of the base film layer 2, wherein the corona treatment is called a corona surface, and the other surface of the base film layer 2 is not subjected to corona treatment and is called a non-corona surface;
(2) uniformly mixing 8 parts of hexafunctional group urethane acrylate, 10 parts of dimethyl siloxane modified urethane acrylate, 2 parts of nine-functional group urethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on a non-corona surface of a BOPP base film, and carrying out UV (ultraviolet) curing to obtain a release layer 1;
(3) preparing a primer by using modified chlorinated polyolefin, and coating the primer on the corona surface of the BOPP base film to obtain a primer 3;
(4) coating acrylic glue on the bottom coating to obtain an adhesive layer 4, and drying to obtain the lithium battery protection adhesive tape with the structure shown in figure 1;
the thickness of the release layer is 0.5 mu m;
the thickness of the primer layer was 0.5 μm;
the thickness of the adhesive layer was 15 μm.
Example 4
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 60-micron BOPP base film as a base film layer 2, carrying out corona treatment on one surface of the base film layer 2, wherein the corona treatment is called a corona surface, and the other surface of the base film layer 2 is not subjected to corona treatment and is called a non-corona surface;
(2) uniformly mixing 8 parts of hexafunctional group polyurethane acrylate, 10 parts of fluorocarbon modified polyurethane acrylate, 2 parts of nine-functional group polyurethane acrylate, 2.5 parts of organic silicon monomer, 11741.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a parting agent, coating the parting agent on a non-corona surface of a BOPP base film, and carrying out UV (ultraviolet) curing to obtain a parting layer 1;
(3) preparing a primer by using modified chlorinated polyolefin, and coating the primer on the corona surface of the BOPP base film to obtain a primer 3;
(4) coating acrylic glue on the bottom coating to obtain an adhesive layer 4, and drying to obtain the lithium battery protection adhesive tape with the structure shown in figure 1;
the thickness of the release layer is 0.05 μm;
the thickness of the primer layer was 0.05 μm;
the thickness of the adhesive layer was 12 μm.
Comparative example 1
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 50-micron PET base film as a base film layer, carrying out corona treatment on one surface of the base film layer to obtain a corona surface, and enabling the other surface of the base film layer not to be subjected to corona treatment to obtain a non-corona surface;
(2) uniformly mixing 8 parts of hexafunctional group polyurethane acrylate, 10 parts of dimethyl siloxane modified polyurethane acrylate, 2 parts of nine-functional group polyurethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on a non-corona surface of a PET (polyethylene terephthalate) base film, and carrying out UV (ultraviolet) curing to obtain a release layer;
(3) preparing a primer by utilizing modified chlorinated polyolefin, and coating the primer on the corona surface of the PET base film to obtain a primer;
(4) coating acrylic glue on the bottom coating to obtain an adhesive layer, and drying to obtain the lithium battery protective adhesive tape;
the thickness of the release layer is 1 mu m;
the thickness of the primer layer is 1 μm;
the thickness of the adhesive layer was 9 μm.
Comparative example 2
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 60-micron BOPP base film as a base film layer, and carrying out corona treatment on two surfaces of the base film layer, wherein the base film layer is called a corona surface;
(2) uniformly mixing 8 parts of hexafunctional group urethane acrylate, 10 parts of dimethyl siloxane modified urethane acrylate, 2 parts of nine-functional group urethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on one corona surface of a BOPP base film, and carrying out UV (ultraviolet) curing to obtain a release layer;
(3) preparing a primer by using the modified chlorinated polyolefin, and coating the primer on the other corona surface of the BOPP base film to obtain a primer;
(4) coating acrylic glue on the bottom coating to obtain an adhesive layer, and drying to obtain the lithium battery protection adhesive tape;
the thickness of the release layer is 0.05 μm;
the thickness of the primer layer was 0.05 μm;
the thickness of the adhesive layer was 12 μm.
Comparative example 3
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 60-micron BOPP base film as a base film layer, wherein both sides of the base film layer are not subjected to corona treatment and are called non-corona sides;
(2) uniformly mixing 8 parts of hexafunctional group urethane acrylate, 10 parts of dimethyl siloxane modified urethane acrylate, 2 parts of nine-functional group urethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on a non-corona surface of a BOPP base film, and carrying out UV (ultraviolet) curing to obtain a release layer;
(3) preparing a primer by using modified chlorinated polyolefin, and coating the primer on the other non-corona surface of the BOPP base film to obtain a primer;
(4) coating acrylic glue on the bottom coating to obtain an adhesive layer, and drying to obtain the lithium battery protection adhesive tape;
the thickness of the release layer is 0.05 μm;
the thickness of the primer layer was 0.05 μm;
the thickness of the adhesive layer was 12 μm.
Comparative example 4
A lithium battery protection adhesive tape is prepared by the following steps:
(1) selecting a 60-micron BOPP base film as a base film layer, carrying out corona treatment on one surface of the base film layer, wherein the corona treatment is called a corona surface, and the other surface of the base film layer is not subjected to corona treatment and is called a non-corona surface;
(2) preparing a primer by using modified chlorinated polyolefin, and coating the primer on the corona surface of the BOPP base film to obtain a primer;
(3) coating acrylic glue on the bottom coating to obtain an adhesive layer, and drying to obtain the lithium battery protection adhesive tape;
the thickness of the primer layer was 0.05 μm;
the thickness of the adhesive layer was 12 μm.
Comparative example 5
A preparation method of a protective adhesive tape for a lithium battery comprises the following steps:
(1) selecting a 60-micron BOPP base film as a base film layer, carrying out corona treatment on one surface of the base film layer, wherein the corona treatment is called a corona surface, and the other surface of the base film layer is not subjected to corona treatment and is called a non-corona surface;
(2) uniformly mixing 8 parts of hexafunctional group urethane acrylate, 10 parts of dimethyl siloxane modified urethane acrylate, 2 parts of nine-functional group urethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on a non-corona surface of a BOPP base film, and carrying out UV curing to obtain a release layer;
(3) coating acrylic glue on the corona surface of the BOPP base film to obtain an adhesive layer, and drying to obtain the lithium battery protection adhesive tape;
the thickness of the release layer is 0.05 μm;
the thickness of the adhesive layer was 12 μm.
Comparative example 6
A preparation method of a protective adhesive tape for a lithium battery comprises the following steps:
(1) selecting a 60-micron BOPP base film as a base film layer, carrying out corona treatment on one surface of the base film layer, wherein the corona treatment is called a corona surface, and the other surface of the base film layer is not subjected to corona treatment and is called a non-corona surface;
(2) uniformly mixing 8 parts of hexafunctional group polyurethane acrylate, 10 parts of fluorocarbon modified polyurethane acrylate, 2 parts of nine-functional group polyurethane acrylate, 2.5 parts of organic silicon monomer, 11731.5 parts of photoinitiator, 1841.0 parts of photoinitiator and 75 parts of diluent to obtain a release agent, coating the release agent on the non-corona surface of the BOPP base film, and carrying out UV curing to obtain a release layer;
(3) coating acrylic glue on the corona surface of the BOPP base film to obtain an adhesive layer, and drying to obtain the lithium battery protection adhesive tape;
the thickness of the release layer is 0.05 μm;
the thickness of the adhesive layer was 12 μm.
Test example
1. Experimental construction mode
The test subjects used in the test examples were the lithium battery protection tapes obtained in examples 1 to 4 and comparative examples 1 to 6, and the test subjects were subjected to peel strength, degumming and adhesion tests.
(1) Peel strength test
The lithium battery protection tapes prepared in examples 1 to 4 and comparative examples 1 to 6 were subjected to peel strength test according to the method of national standard GB/T2792-2014.
(2) Peel Strength test after high temperature and high pressure
The release layer of the lithium battery protection tape prepared in the examples 1-4, the comparative examples 1-3 and the comparative examples 5-6 is bonded with an aluminum foil, the adhesive layer is bonded with a casting polypropylene (CPP layer for short) in a plastic film, the BOPP base film of the lithium battery protection tape prepared in the comparative example 4 is bonded with an aluminum foil, the adhesive layer is bonded with a CPP layer, the hot pressing is carried out for 60min at the temperature of 80 ℃ under the pressure of 0.5MPa, and the peeling strength test is carried out according to the method of the national standard GB/T2792-.
(3) High temperature and high pressure degumming and adhesion test
The lithium battery protection tapes prepared in examples 1 to 4 and comparative examples 1 to 6 were adhered to a steel plate, rolled by a press roll, left to stand for 20min, baked in an oven at 85 ℃ for 8h, then the steel plate was taken out of the oven and cooled for 30min, the lithium battery protection tapes were peeled off from the steel plate uniformly, and the presence or absence of residual adhesive on the steel plate and the occurrence of warping, blistering, and adhesion of the tapes were observed.
2. Results of the experiment
Table 1 lithium battery protection tape each performance test data
The peel strength, degumming and blocking test results of the lithium battery protection tapes obtained in examples 1 to 4 and comparative examples 1 to 6 are shown in table 1. As can be seen from Table 1, compared with the lithium battery protection adhesive tapes of comparative examples 1 to 6, the lithium battery protection adhesive tape provided by the utility model has moderate viscosity and higher peel strength, and has no degumming, no bubble mark, no adhesion and no warping phenomenon after vacuum baking at 85 ℃ for 8 hours. In addition, it was observed that the lithium battery protection tape of comparative example 1, due to the PET-based film, did not exhibit the phenomena of debonding and blocking, but exhibited warpage and slight bubble marks. The above results show that the BOPP base film for the adhesive tape provided by the utility model is subjected to corona treatment (corona surface) on one side and is not subjected to corona treatment (non-corona surface), the corona surface of the BOPP base film is sequentially compounded with the base coat and the adhesive layer, the non-corona surface is compounded with the release layer, and the BOPP base film is used for preparing the lithium battery protective adhesive tape, so that the problems of warping, foaming, degumming and adhesion in the use of the traditional protective adhesive tape can be solved.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (6)
1. A lithium battery protection adhesive tape is characterized in that: the BOPP base film comprises two oppositely arranged surfaces, wherein a corona surface for compounding with an adhesive layer is formed on one surface, and a non-corona surface for compounding with a release layer is formed on the other surface;
the adhesive layer is compounded with the corona surface of the BOPP base film, and the release layer is compounded with the non-corona surface of the BOPP base film;
the glue layer comprises a bottom coating, and the bottom coating is compounded with the corona surface of the BOPP basal film.
2. The lithium battery protection tape according to claim 1, wherein: the thickness of the primer layer is 0.05-1 μm.
3. The lithium battery protection tape according to claim 1, wherein: the adhesive layer further comprises an adhesive layer, and the release layer, the BOPP base film, the bottom coating and the adhesive layer are sequentially compounded.
4. The lithium battery protection tape according to claim 1, wherein: the thickness of the release layer is 0.05-1 μm.
5. The lithium battery protection tape according to claim 1, wherein: the thickness of the BOPP basal membrane is 50-65 μm.
6. The lithium battery protection tape according to claim 3, wherein: the thickness of the adhesive layer is 0.05-1 μm.
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| CN202123024114.4U CN216584834U (en) | 2021-12-02 | 2021-12-02 | BOPP (biaxially-oriented polypropylene) base film for adhesive tape and lithium battery protection adhesive tape applying BOPP base film |
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| CN202123024114.4U CN216584834U (en) | 2021-12-02 | 2021-12-02 | BOPP (biaxially-oriented polypropylene) base film for adhesive tape and lithium battery protection adhesive tape applying BOPP base film |
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