CN115991957A - Coating, aluminum plastic film and lithium battery - Google Patents
Coating, aluminum plastic film and lithium battery Download PDFInfo
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- CN115991957A CN115991957A CN202211708864.XA CN202211708864A CN115991957A CN 115991957 A CN115991957 A CN 115991957A CN 202211708864 A CN202211708864 A CN 202211708864A CN 115991957 A CN115991957 A CN 115991957A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 94
- 238000000576 coating method Methods 0.000 title claims abstract description 93
- 239000011248 coating agent Substances 0.000 title claims abstract description 89
- 239000002985 plastic film Substances 0.000 title claims abstract description 83
- 229920006255 plastic film Polymers 0.000 title claims abstract description 83
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 46
- 239000000049 pigment Substances 0.000 claims abstract description 45
- 239000000945 filler Substances 0.000 claims abstract description 32
- 238000009736 wetting Methods 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 229920000642 polymer Polymers 0.000 claims abstract description 17
- 229920000098 polyolefin Polymers 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000003960 organic solvent Substances 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 claims description 37
- 239000004952 Polyamide Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 17
- 229920002647 polyamide Polymers 0.000 claims description 17
- 239000011888 foil Substances 0.000 claims description 16
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000012790 adhesive layer Substances 0.000 claims description 12
- 239000006229 carbon black Substances 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 10
- -1 polypropylene Polymers 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 9
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol Substances OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 7
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 6
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 6
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 claims description 6
- 239000002105 nanoparticle Substances 0.000 claims description 5
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 4
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000012948 isocyanate Substances 0.000 claims description 4
- 150000002513 isocyanates Chemical class 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 239000004645 polyester resin Substances 0.000 claims description 4
- 229920001225 polyester resin Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 3
- JMMWKPVZQRWMSS-UHFFFAOYSA-N isopropanol acetate Natural products CC(C)OC(C)=O JMMWKPVZQRWMSS-UHFFFAOYSA-N 0.000 claims description 3
- 229940011051 isopropyl acetate Drugs 0.000 claims description 3
- GWYFCOCPABKNJV-UHFFFAOYSA-N isovaleric acid Chemical compound CC(C)CC(O)=O GWYFCOCPABKNJV-UHFFFAOYSA-N 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229920005749 polyurethane resin Polymers 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 abstract description 35
- 230000000694 effects Effects 0.000 abstract description 29
- 238000000034 method Methods 0.000 abstract description 14
- 230000032683 aging Effects 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 239000000853 adhesive Substances 0.000 abstract description 7
- 230000001070 adhesive effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 14
- 230000008859 change Effects 0.000 description 9
- 239000002344 surface layer Substances 0.000 description 7
- 239000003292 glue Substances 0.000 description 5
- 238000013329 compounding Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
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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
Abstract
The invention discloses a coating, an aluminum plastic film and a lithium battery. The coating comprises main resin, polyolefin modified polymer, nanoscale pigment, micron filler, wetting dispersant, drier, curing agent and organic solvent. The coating formed by the coating can simultaneously show black and matte effects, so that the black and matte effects of the aluminum-plastic film can be realized through one process, the preparation process is simple, the operation is convenient, and the production efficiency is high; meanwhile, the coating formed by the coating has good adhesive force, black, bright and uniform color and excellent electrolyte resistance; the aluminum plastic film prepared by the coating is uniform and fine in color, good in electrolyte resistance and aging resistance, and high in yield.
Description
Technical Field
The invention belongs to the technical field of aluminum plastic films, and particularly relates to a coating, an aluminum plastic film and a lithium battery.
Background
At present, the lithium ion battery technology is mature, and is widely applied to the fields of 3C electronic products, power batteries, energy storage and the like, so that the lithium ion battery packaging material is in greater demand. In the field of lithium battery packaging, the packaging forms are mainly divided into three types at present: cylindrical, square, and soft pack. In the high-end products of 3C electronics such as mobile phones, the aluminum plastic film soft package has the advantages of light weight, safety and the like. In recent years, black aluminum plastic films are popular, on one hand, black matte presented by the black aluminum plastic films gives people a luxury feeling, on the other hand, the black aluminum plastic films present black with higher chromaticity, and further, blue, red, yellow or green light-colored characters, especially white characters, printed on the aluminum plastic films can be better highlighted, and the black aluminum plastic films have both surface character salience and color variability, so that the market share of the black aluminum plastic films is larger and larger. At present, the appearance of the black aluminum plastic film effect is mostly realized through the scheme design of a black layer and a dummy layer, and the working procedure is relatively complex. For example, after adding carbon black into an outer layer adhesive to design the adhesive into black glue, performing matte oil coating on the outermost layer, wherein the addition of the carbon black in the adhesive in the scheme easily causes obvious reduction of stripping force and has a certain influence on the performance of the outer layer; the other method is to coat black ink on the inner layer of the polyamide film, then compound, and finally coat a layer of matt oil on the outer layer of the polyamide film. In addition, the outer layer of the existing aluminum plastic film has no electrolyte resistant effect, and in the liquid injection process of manufacturing the soft package battery, the surface layer of the aluminum plastic film is easy to corrode when being dripped into electrolyte, so that the loss rate of a finished product is relatively high. Therefore, the existing black aluminum plastic film needs to be improved.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, an object of the present invention is to propose a coating, an aluminum plastic film and a lithium battery. The coating formed by the coating can simultaneously show black and matte effects, so that the black and matte effects of the aluminum-plastic film can be realized through one process, the preparation process is simple, the operation is convenient, and the production efficiency is high; meanwhile, the coating formed by the coating has good adhesive force, black, bright and uniform color and excellent electrolyte resistance; the aluminum plastic film prepared by the coating is uniform and fine in color, good in electrolyte resistance and aging resistance, and high in yield.
In one aspect of the invention, the invention provides a coating. According to an embodiment of the invention, the coating comprises: the main resin, polyolefin modified polymer, nano-scale pigment, micro-scale filler, wetting dispersant, drier, curing agent and organic solvent.
The coating according to the embodiment of the invention comprises a main resin, a polyolefin modified polymer, a nano-scale pigment, a micro-scale filler, a wetting dispersant, a drier, a curing agent and an organic solvent. The main resin can promote the adhesion effect of the paint and the base material; the nanoscale pigment enables a coating formed by the paint to have a color effect; the micron-sized filler not only can enable the coating formed by the coating to have a matte effect, but also has a certain smooth characteristic, can reduce the friction coefficient of the aluminum plastic film prepared by the micron-sized filler, and improves the deep-drawing stability of the aluminum plastic film, thereby improving the yield of the aluminum plastic film. Meanwhile, as the nanoscale pigments with different particle sizes are matched and combined with the micron-sized filler, the filling and embedding effects are achieved, the nanoscale pigments are dispersed more uniformly, and the color blackness and glossiness of a coating formed by the coating are also more uniform; the polyolefin modified polymer is added, so that the coating formed by the coating has good electrolyte resistance, and the aluminum plastic film has the electrolyte resistance; the wetting dispersant is distributed on the surface of the nanoscale pigment molecules, one end of the wetting dispersant is wound and adsorbed with the resin, and the other end of the wetting dispersant is coated with pigment particles, so that the wetting dispersant can be uniformly coated in a resin system, and the nanoscale pigment is flocculated and stabilized through the steric hindrance effect of the wetting dispersant, so that the pigment system is prevented from generating flooding and flowery. Therefore, the coating formed by the coating can simultaneously show black and matte effects, so that the black and matte effects of the aluminum plastic film can be realized through one process, the preparation process is simple, the operation is convenient, and the production efficiency is high; meanwhile, the coating formed by the coating has good adhesive force, black, bright and uniform color and excellent electrolyte resistance; the aluminum plastic film prepared by the coating is uniform and fine in color, good in electrolyte resistance and aging resistance, and high in yield.
In addition, the paint according to the embodiment of the invention can also have the following technical characteristics:
in some embodiments of the present invention, the main resin is 10 to 35 parts by weight, the polyolefin modified polymer is 5 to 12 parts by weight, the nano-sized pigment is 10 to 40 parts by weight, the micro-sized filler is 5 to 20 parts by weight, the wetting dispersant is 5 to 15 parts by weight, the drier is 1 to 3 parts by weight, the curing agent is 1 to 8 parts by weight, and the organic solvent is 30 to 60 parts by weight. Thus, the formed coating exhibits both black and matte effects and is excellent in electrolyte resistance.
In some embodiments of the invention, the nanoscale pigment has a particle size of no greater than 100nm. Therefore, the nano-scale pigment is distributed more uniformly, and the formed coating has black, bright and uniform color.
In some embodiments of the invention, the nanoscale pigment comprises at least one of nanoscale carbon black powder, pigment carbon black, and oily ink.
In some embodiments of the invention, the micron-sized filler has a particle size of 1 μm to 5 μm. Therefore, the formed coating simultaneously presents black and matte effects, and has dark, bright and uniform color.
In some embodiments of the invention, the micron-sized filler comprises at least one of titanium dioxide, aluminum powder, and silicon dioxide.
In some embodiments of the invention, the primary resin comprises at least one of a polyester resin, an acrylic resin, and a polyurethane resin.
In some embodiments of the invention, the polyolefin modified polymer comprises at least one of polyethylene-maleic anhydride grafts, polypropylene-maleic anhydride grafts, polyethylene-glycerol methacrylate grafts, and polypropylene-glycerol methacrylate grafts.
In some embodiments of the invention, the wetting dispersant comprises a polymeric dispersant having a molecular weight of 5000-10000.
In some embodiments of the invention, the polymeric dispersant includes at least one of a polyurethane dispersant, an acrylate dispersant, a polyacrylamide dispersant, and a polyester dispersant.
In some embodiments of the invention, the drier includes at least one of an organotin drier, an organoamine drier, and an organobismuth drier.
In some embodiments of the invention, the curing agent comprises at least one of an isocyanate and an epoxy resin.
In some embodiments of the invention, the organic solvent comprises at least one of propylene glycol methyl ether, isopropanol, ethyl acetate, butyl acetate, isopropyl acetate, n-butanol, methyl isobutyl ketone, acetone, butanone, cyclohexanone, propylene glycol methyl ether acetate, and isophorone.
In a second aspect of the present invention, the present invention provides an aluminum plastic film. According to an embodiment of the present invention, the aluminum plastic film includes a coating layer, a polyamide film layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, and a polypropylene film layer in this order, the coating layer being formed by applying the above-mentioned coating on the polyamide film layer. Therefore, the aluminum plastic film with black and matte effects can be prepared by adopting one-step process, and the aluminum plastic film is uniform and fine in color, good in electrolyte resistance and ageing resistance, and high in yield.
In addition, the aluminum plastic film according to the embodiment of the invention can also have the following technical characteristics:
in some embodiments of the invention, the coating has a thickness of 0.5 μm to 10 μm. Therefore, the aluminum plastic film has uniform and fine color and luster and good electrolyte resistance and aging resistance.
In some embodiments of the invention, the polyamide film layer has a thickness of 15 μm to 30 μm.
In some embodiments of the invention, the first adhesive layer has a thickness of 1 μm to 5 μm.
In some embodiments of the invention, the aluminum foil layer has a thickness of 20 μm to 50 μm.
In some embodiments of the invention, the second adhesive layer has a thickness of 1 μm to 5 μm.
In some embodiments of the invention, the polypropylene film layer has a thickness of 30 μm to 80 μm.
In a third aspect of the present invention, a lithium battery is provided. According to the embodiment of the invention, the aluminum plastic film is adopted in the lithium battery. Thus, the lithium battery exhibits a black and noble appearance and has good electrolyte resistance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of an aluminum plastic film structure according to an embodiment of the present invention;
FIG. 2 is a graph showing the results of the electrolyte resistance test of the aluminum plastic films of examples 1-2 and comparative example 1 according to the present invention.
Detailed Description
The following detailed description of the embodiments of the invention is intended to be illustrative of the invention and is not to be taken as limiting the invention.
In one aspect of the invention, the invention provides a coating. According to an embodiment of the invention, the coating comprises: the main resin, polyolefin modified polymer, nano-scale pigment, micro-scale filler, wetting dispersant, drier, curing agent and organic solvent.
The coating according to the embodiment of the invention comprises a main resin, a polyolefin modified polymer, a nano-scale pigment, a micro-scale filler, a wetting dispersant, a drier, a curing agent and an organic solvent. The main resin can promote the adhesion effect of the paint and the base material; the nanoscale pigment ensures that the coating formed by the paint has a color effect; the micron-sized filler not only can enable the coating formed by the coating to have a matte effect, but also has a certain smooth characteristic, can reduce the friction coefficient of the aluminum plastic film prepared by the micron-sized filler, and improves the deep-drawing stability of the aluminum plastic film, thereby improving the yield of the aluminum plastic film. Meanwhile, as the nano-level pigments with different particle sizes are matched and combined with the micron-level filler, the filling and embedding effects are achieved, the dispersion of the nano-level pigments is more uniform, and the color blackness and glossiness of a coating formed by the coating are also more uniform; the polyolefin modified polymer is added, so that the coating formed by the coating has good electrolyte resistance, and the aluminum plastic film has the electrolyte resistance; the wetting dispersant is distributed on the surface of the nanoscale pigment molecules, one end of the wetting dispersant is wound and adsorbed with the resin, and the other end of the wetting dispersant is coated with pigment particles, so that the wetting dispersant can be uniformly coated in a resin system, and the nanoscale pigment is flocculated and stabilized through the steric hindrance effect of the wetting dispersant, so that the pigment system is prevented from generating flooding and flowery. Therefore, the coating formed by the coating can simultaneously show black and matte effects, so that the black and matte effects of the aluminum plastic film can be realized through one process, the preparation process is simple, the operation is convenient, and the production efficiency is high; meanwhile, the coating formed by the coating has good adhesive force, black, bright and uniform color and excellent electrolyte resistance; the aluminum plastic film prepared by the coating is uniform and fine in color, good in electrolyte resistance and aging resistance, and high in yield.
The main resin, the polyolefin modified polymer, the nano-sized pigment, the micro-sized filler, the wetting dispersant, the drier, the curing agent and the organic solvent are conventional materials in the art, and may be selected according to the actual practice by those skilled in the art. For example, the main resin includes at least one of a polyester resin, an acrylic resin, and a polyamide resin; the polyolefin modified polymer comprises at least one of polyethylene-maleic anhydride graft, polypropylene-maleic anhydride graft, polyethylene-glycerol methacrylate graft and polypropylene-glycerol methacrylate graft; the nanoscale pigment comprises at least one of nanoscale carbon black powder, pigment carbon black and oily ink; the micron-sized filler comprises at least one of titanium dioxide, aluminum powder and silicon dioxide; the wetting dispersant comprises a high molecular type dispersant, the molecular weight of the high molecular type dispersant is 5000-10000, and the high molecular type dispersant comprises at least one of polyurethane dispersant, acrylate dispersant, polyacrylamide dispersant and polyester dispersant; the drier comprises at least one of an organotin drier, an organoamine drier and an organobismuth drier; the curing agent comprises at least one of isocyanate and epoxy resin; the organic solvent comprises at least one of propylene glycol methyl ether, isopropanol, ethyl acetate, butyl acetate, isopropyl acetate, n-butanol, methyl isobutyl ketone, acetone, butanone, cyclohexanone, propylene glycol methyl ether acetate and isophorone.
According to the embodiment of the invention, 10 to 35 parts by weight of the main resin, 5 to 12 parts by weight of the polyolefin modified polymer, 10 to 40 parts by weight of the nano-sized pigment, 5 to 20 parts by weight of the micro-sized filler, 5 to 15 parts by weight of the wetting dispersant, 1 to 3 parts by weight of the drier, 1 to 8 parts by weight of the curing agent and 30 to 60 parts by weight of the organic solvent are used. The inventor finds that when the weight ratio of the main resin is too small, the film forming property is poor, and when the weight ratio of the main resin is too large, the electrolyte resistance of a coating formed by the paint is reduced; when the weight ratio of the polyolefin modified polymer is too small, the electrolyte resistance of a coating formed by the coating is weak, and when the weight ratio of the polyolefin modified polymer is too large, the heat resistance is reduced; the weight ratio of the nanoscale pigment is too small, the hiding power is insufficient, the blackness is insufficient, the weight ratio of the nanoscale pigment is too large, and the coating wettability of the resin on the pigment is poor; when the weight ratio of the micron-sized filler is too small, the glossiness is higher, and when the weight ratio of the micron-sized filler is too large, the coating formed by the coating is grey and has insufficient blackness; when the weight ratio of the wetting dispersant is too small, the coating property on the pigment and filler is poor, the dispersibility is poor, and when the weight ratio of the wetting dispersant is too large, the overall viscosity of the coating is higher, and the coating leveling property is affected. Therefore, the coating formed by the coating with the weight ratio of the components simultaneously shows black and matte effects, and has excellent electrolyte resistance.
According to an embodiment of the present invention, the particle size of the nanoscale pigment is no greater than 100nm. The inventors found that the particle size of the nano-sized pigment is too large, and the dispersion uniformity is poor. Therefore, the application adopts the nano-grade pigment with the grain diameter not more than 100nm, the dispersion is more uniform, and the formed coating has black, bright and uniform color.
According to an embodiment of the present invention, the micron-sized filler has a particle size of 1 μm to 5 μm. The inventor finds that if the particle size of the micron-sized filler is too large, the dispersion is poor and sedimentation is easy to occur; the effect of surface smoothness cannot be achieved if the particle size of the micron-sized filler is too small. Therefore, the application adopts the micron-sized filler with the particle size of 1-5 mu m, and the formed coating simultaneously presents black and matte effects, and has black, bright and uniform color.
In a second aspect of the present invention, the present invention provides an aluminum plastic film. According to an embodiment of the present invention, referring to fig. 1, the aluminum plastic film includes a coating layer 10, a polyamide film layer 20, a first adhesive layer 30, an aluminum foil layer 40, a second adhesive layer 50, and a polypropylene film layer 60 in this order. The coating 10 is formed by applying the above-described coating on the polyamide film layer 20. Therefore, the aluminum plastic film with black and matte effects can be prepared by adopting one-step process, and the aluminum plastic film is uniform and fine in color, good in electrolyte resistance and ageing resistance, and high in yield. It should be noted that the features and advantages described above for the coating are also applicable to the plastic-aluminum film, and are not described herein.
According to an embodiment of the present invention, referring to fig. 1, the thickness of the coating layer 10 is 0.5 μm to 10 μm. The inventors found that the coating 10 had too thick a thickness, and the coating adhesion was poor; the thickness of the coating 10 is too small, a sufficient blackness is not achieved, and the electrolyte resistance effect is poor. Therefore, the coating 10 with the thickness of 0.5-10 mu m is adopted, and the aluminum plastic film has uniform and fine color and luster and good electrolyte resistance and aging resistance. Further, the thickness of the polyamide film layer 20 is 15 μm to 30 μm; the thickness of the first adhesive layer 30 is 1 μm to 5 μm; the thickness of the aluminum foil layer 40 is 20 μm to 50 μm; the thickness of the second adhesive layer 50 is 1 μm to 5 μm; the thickness of the polypropylene film layer 60 is 30 μm to 80 μm.
In a third aspect of the present invention, a lithium battery is provided. According to the embodiment of the invention, the aluminum plastic film is adopted in the lithium battery. Thus, the lithium battery exhibits a black and noble appearance and has good electrical properties. It should be noted that the features and advantages described above for the plastic-aluminum film are also applicable to the lithium battery, and are not described herein.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not limiting in any way.
Example 1
The method comprises the steps of using 40 mu m aluminum foil, carrying out degreasing and activating treatment on the surface of the aluminum foil, referring to a cleaning method of China patent CN100545308, carrying out passivating treatment on the surface of the aluminum foil, coating 3 mu m outer layer glue on the matte surface of the aluminum foil after the passivating treatment, compounding a 25 mu m polyamide film, coating 3 mu m inner layer glue on the polished surface of the aluminum foil, compounding a 40 mu m polypropylene film to obtain a conventional silver aluminum plastic film, and finally coating a paint on the surface layer of the polyamide film of the aluminum plastic film to form a coating, thereby obtaining a black aluminum plastic film.
The paint formula is as follows: 15 parts by weight of a polyester resin; 10 parts by weight of polypropylene-maleic anhydride graft; 25 parts by weight of a nanoscale pigment carbon black pigment; 10 parts by weight of micron-sized silica filler; 5 parts by weight of polyurethane dispersant; 3 parts by weight of an organic amine drier; 2 parts by weight of an epoxy resin curing agent; 30 parts by weight of methyl isobutyl ketone/butanone (4/1). Wherein, the particle size of the nano-scale pigment is 60nm; the micron-sized filler particle size is 3um.
Example 2
The method comprises the steps of using 35 mu m aluminum foil, carrying out degreasing and activating treatment on the surface of the aluminum foil, referring to a cleaning method of China patent CN100545308, carrying out passivating treatment on the surface of the aluminum foil, coating 2 mu m outer layer glue on the matte surface of the aluminum foil after the passivating treatment, compounding 15 mu m polyamide film, coating 2 mu m inner layer glue on the polished surface of the aluminum foil, compounding 30 mu m polypropylene film, obtaining a conventional silver aluminum plastic film, and finally coating a coating on the polyamide surface layer of the aluminum plastic film to form a coating, thereby obtaining the black aluminum plastic film.
The paint formula is as follows: 10 parts by weight of an acrylic resin; 9 parts by weight of polypropylene-glycerol methacrylate graft; 20 parts by weight of a nanoscale carbon black powder pigment; 7 parts by weight of micron-sized titanium dioxide filler; 10 parts by weight of a polyester type dispersing agent; 1 part by weight of an organotin drier; 3 parts by weight of an isocyanate curing agent; propylene glycol methyl ether acetate/ethyl acetate (4/1) 40 parts by weight. Wherein, the grain diameter of the nano-scale pigment is 40nm; the micron-sized filler particle size is 2um.
Comparative example 1
Adopts a commercially available black aluminum plastic film (the process is that black printing ink is coated on the inner layer of a polyamide film and then is compounded, and finally, a matt oil is coated on the outer layer of the polyamide film)
(1) Appearance of the aluminum plastic films of examples 1-2 and comparative example 1: the black aluminum plastic film prepared in the embodiment 1-2 has uniform visual color, black and bright color and higher blackness. Gloss test: before testing, the aluminum plastic films of examples 1-2 and comparative example 1 are placed on a flat tabletop with the black surface facing upwards after the instrument is calibrated by a self-contained standard sheet, the gloss meter is placed on the surface of the aluminum plastic film for gloss testing, the value of 60 degrees on the gloss meter is read, each sample is tested by taking three position points, the average value of test results is the final gloss value, and the gloss requirement of the black aluminum plastic film matte layer in the current market is in the range of 2.0+/-1.0. The specific results are shown in Table 1.
TABLE 1
| Color of | Gloss (60 degree) | |
| Example 1 | Deep black color | 1.6 |
| Example 2 | Deep black color | 2.8 |
| Comparative example 1 | Black gray color | 3.5 |
As can be seen from Table 1, the aluminum plastic films prepared in example 1 and example 2 are all dark black in color, have glossiness within the range of 2.0+ -1.0, and have both blackness and good matte effect.
(2) Adhesion test: the aluminum plastic films of examples 1-2 and comparative example 1 were drawn on the surface layer of the aluminum plastic film by a hundred-cell knife, the positions of the hundred cells were stuck by a 3M adhesive tape, after the air bubbles in the middle of the adhesive tape were pressed and squeezed out, the adhesive tape was rapidly torn off after holding for 1min, and no peeling of the coating was observed. The test results are shown in Table 2.
TABLE 2
| Adhesion test | |
| Example 1 | No falling off |
| Example 2 | No falling off |
| Comparative example 1 | Slight punctiform drop |
From the adhesion test results, the coatings of the aluminum plastic films prepared in examples 1-2 are free from falling off, which indicates that the coatings of the application have good adhesion. The aluminum plastic film of comparative example 1 was slightly dropped off in a dot shape, and the adhesion was weaker than that of examples 1-2.
(3) Electrolyte resistance test: 1-2 drops of electrolyte (1M LiPF6 EC:DMC:DEC =1:1:1 of commercial lithium battery electrolyte) are dripped on the surfaces of the aluminum plastic films of the examples 1-2 and the comparative example 1, the aluminum plastic films are kept stand for 1min and 12h, and after the electrolyte on the surfaces of the aluminum plastic films is erased by paper towels, the corrosion condition of the surfaces is observed. The specific test results are shown in Table 3 and FIG. 2.
TABLE 3 Table 3
| Dropping electrolyte for 1min test | Electrolyte resistance time of coating | |
| Example 1 | No surface layer abnormality | ≥12h |
| Example 2 | No surface layer abnormality | ≥12h |
| Comparative example 1 | The surface layer is corroded | <1min |
As can be seen from Table 3, after electrolyte is dropped for 1min, the surfaces of the examples 1-2 are unchanged, the surfaces of the commercially available black aluminum plastic films are corroded, and the electrolyte resistance time of the coatings of the examples 1-2 is not less than 12h, which indicates that the coatings of the application have good electrolyte resistance, and as can be seen from FIG. 2, the electrolyte resistance of the examples 1-2 is significantly better than that of the comparative example 1.
(4) Examples 1-2 and comparative example 1 heat and humidity resistance test of aluminum-plastic films
(1) Heat resistance test: after punching the shell of the aluminum plastic film sample, taking out the aluminum plastic film sample after the aluminum plastic film sample is placed at a high temperature of 85 ℃ for 1 day, observing the apparent changes of the front and rear sample pieces, and confirming whether the defects of layering, white lines, color change and the like exist or not, and simultaneously comparing three parallel samples in each sample test.
(2) Wet heat resistance test: after the aluminum plastic film sample is punched into a shell, the aluminum plastic film sample is placed for 3 days under the condition of 60 ℃/90% RH, the apparent change of the sample wafer before and after the heat and humidity resistance is observed, whether defects such as layering, white lines, color change and the like exist is confirmed, and three parallel samples are simultaneously placed for comparison in each sample test.
The heat resistance and wet heat resistance test results of the aluminum plastic films of examples 1-2 and the aluminum plastic film of comparative example 1 are shown in Table 4.
TABLE 4 Table 4
| Heat resistance (85 ℃/1 d) | Moisture and heat resistance (60℃)&90％RH/3d) | |
| Example 1 | No change | No change |
| Example 2 | No change | No change |
| Comparative example 1 | No change | Color change |
As can be seen from Table 4, the aluminum plastic films prepared in examples 1-2 have better heat resistance and humidity resistance, which indicates that the aluminum plastic film has excellent ageing resistance and weather resistance and good stability.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A coating, comprising: the main resin, polyolefin modified polymer, nano-scale pigment, micro-scale filler, wetting dispersant, drier, curing agent and organic solvent.
2. The paint according to claim 1, wherein the main resin is 10 to 35 parts by weight, the polyolefin modified polymer is 5 to 12 parts by weight, the nano-sized pigment is 10 to 40 parts by weight, the micro-sized filler is 5 to 20 parts by weight, the wetting dispersant is 5 to 15 parts by weight, the drier is 1 to 3 parts by weight, the curing agent is 1 to 8 parts by weight, and the organic solvent is 30 to 60 parts by weight.
3. The coating according to claim 1 or 2, wherein the nanoscale pigment has a particle size of no more than 100nm;
optionally, the nanoscale pigment comprises at least one of nanoscale carbon black powder, pigment carbon black, and oily ink.
4. The coating according to claim 1 or 2, wherein the micron-sized filler has a particle size of 1 μm to 5 μm;
optionally, the micron-sized filler comprises at least one of titanium dioxide, aluminum powder, and silicon dioxide.
5. The coating of claim 1 or 2, wherein the primary resin comprises at least one of a polyester resin, an acrylic resin, and a polyurethane resin;
optionally, the polyolefin modified polymer comprises at least one of polyethylene-maleic anhydride grafts, polypropylene-maleic anhydride grafts, polyethylene-glycerol methacrylate grafts, and polypropylene-glycerol methacrylate grafts.
6. The coating according to claim 1 or 2, wherein the wetting dispersant comprises a polymeric dispersant having a molecular weight of 5000-10000;
optionally, the polymeric dispersant comprises at least one of a polyurethane dispersant, an acrylate dispersant, a polyacrylamide dispersant, and a polyester dispersant;
optionally, the drier comprises at least one of an organotin drier, an organoamine drier, and an organobismuth drier;
optionally, the curing agent comprises at least one of isocyanate and epoxy resin;
optionally, the organic solvent comprises at least one of propylene glycol methyl ether, isopropanol, ethyl acetate, butyl acetate, isopropyl acetate, n-butanol, methyl isobutyl ketone, acetone, butanone, cyclohexanone, propylene glycol methyl ether acetate, and isophorone.
7. An aluminum plastic film comprising, in order, a coating layer, a polyamide film layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, and a polypropylene film layer, wherein the coating layer is formed by applying the coating according to any one of claims 1 to 6 to the polyamide film layer.
8. The aluminum-plastic film according to claim 7, wherein the thickness of the coating layer is 0.5 μm to 10 μm.
9. The aluminum-plastic film according to claim 7 or 8, wherein the thickness of the polyamide film layer is 15 μm to 30 μm;
optionally, the first adhesive layer has a thickness of 1 μm to 5 μm;
optionally, the thickness of the aluminum foil layer is 20-50 μm;
optionally, the second adhesive layer has a thickness of 1 μm to 5 μm;
optionally, the polypropylene film layer has a thickness of 30 μm to 80 μm.
10. A lithium battery, characterized in that the aluminum plastic film according to any one of claims 7 to 9 is used.
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