CN117625050A - Preparation process of aluminum plastic film and aluminum plastic film - Google Patents
Preparation process of aluminum plastic film and aluminum plastic film Download PDFInfo
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- CN117625050A CN117625050A CN202311706955.4A CN202311706955A CN117625050A CN 117625050 A CN117625050 A CN 117625050A CN 202311706955 A CN202311706955 A CN 202311706955A CN 117625050 A CN117625050 A CN 117625050A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 117
- 239000002985 plastic film Substances 0.000 title claims abstract description 67
- 229920006255 plastic film Polymers 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000001723 curing Methods 0.000 claims abstract description 88
- 239000011888 foil Substances 0.000 claims abstract description 62
- 239000004743 Polypropylene Substances 0.000 claims abstract description 54
- -1 polypropylene Polymers 0.000 claims abstract description 39
- 229920001155 polypropylene Polymers 0.000 claims abstract description 39
- 238000002161 passivation Methods 0.000 claims abstract description 35
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000001070 adhesive effect Effects 0.000 claims abstract description 27
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000853 adhesive Substances 0.000 claims abstract description 26
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 26
- 239000011651 chromium Substances 0.000 claims abstract description 26
- 239000004952 Polyamide Substances 0.000 claims abstract description 20
- 229920002647 polyamide Polymers 0.000 claims abstract description 20
- 229920000098 polyolefin Polymers 0.000 claims abstract description 18
- 238000013329 compounding Methods 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims abstract description 14
- 125000005442 diisocyanate group Chemical group 0.000 claims abstract description 14
- 239000003822 epoxy resin Substances 0.000 claims abstract description 14
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000000725 suspension Substances 0.000 claims abstract description 9
- 238000005238 degreasing Methods 0.000 claims abstract description 8
- 238000009832 plasma treatment Methods 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 19
- 239000012790 adhesive layer Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 229920006267 polyester film Polymers 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 4
- 150000001844 chromium Chemical class 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- 229920001083 polybutene Polymers 0.000 claims description 3
- 238000007756 gravure coating Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 9
- 230000032683 aging Effects 0.000 description 7
- 238000004080 punching Methods 0.000 description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- 229910000423 chromium oxide Inorganic materials 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000011265 semifinished product Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000013035 low temperature curing Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- Laminated Bodies (AREA)
Abstract
The invention aims to disclose a preparation process of an aluminum plastic film and the aluminum plastic film, and relates to the technical field of aluminum plastic films, comprising the following steps of: step S1: coating degreasing passivation solution containing trivalent chromium on the front surface and the back surface of the aluminum foil respectively; step S2: drying the aluminum foil through a suspension oven; step S3: the front surface of the aluminum foil is coated with an adhesive consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and solvent; step S4: drying the aluminum foil obtained in the step S3 through a suspension oven; step S5: preheating and preserving the surface of the adhesive of the aluminum foil obtained in the step S4; step S6: carrying out plasma treatment on the polypropylene film and thermally compounding the polypropylene film on the surface of the aluminum foil adhesive obtained in the step S5; step S7: dry-compounding the polyamide film to the back surface of the aluminum foil obtained in the step S6; step S8: and (3) sending the aluminum foil obtained in the step (S7) into a curing chamber for gradient curing to obtain an aluminum-plastic film, and the beneficial effects are that: the front surface of the aluminum foil is coated with an adhesive, so that the adhesion between the polypropylene film layer and the aluminum foil is stronger.
Description
Technical Field
The invention relates to the technical field of aluminum plastic films, in particular to a preparation process of an aluminum plastic film and the aluminum plastic film.
Background
The aluminum plastic film of the lithium ion battery is one of important materials of the flexible package lithium battery, and compared with the battery packaged by an aluminum shell, the flexible package lithium battery has the advantages of shape plasticity, portability, good safety performance and the like, and has wide application in the lithium battery industry.
At present, in the aluminum plastic film industry, a certain adhesive property and peeling strength are required between a polypropylene film and an aluminum foil, and the adhesive force between the polypropylene film and the aluminum foil at present has the defect of influencing the electrolyte resistance of the aluminum plastic film.
In addition, the aluminum plastic film is produced by two production processes, namely a dry process and a thermal process, wherein the dry process is generally adopted in the manner that an adhesive is coated on a material substrate, an outer layer material is compounded after drying, a compounded semi-finished product is placed in a curing chamber for primary curing (curing), the semi-finished product is taken out for compounding an inner layer material after the primary curing (curing) is finished, and the material is placed in the curing chamber again for secondary curing (curing);
the same product is cured twice, so that the production cost of the product is increased, and the industrialization of the product is not facilitated; meanwhile, the same product is cured twice, so that the adhesive cured at first time can be aged, the service life of the product is shortened, the processing aid in the composite film can be separated out due to long curing time, the product has peculiar smell, and the performance can not meet the product requirement seriously.
Therefore, there is a need to develop a process for preparing an aluminum plastic film and an aluminum plastic film to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to disclose a preparation process of an aluminum plastic film and the aluminum plastic film.
The invention provides a preparation process of an aluminum plastic film.
The second invention aims to provide an aluminum plastic film.
In order to achieve the first object, the invention provides a preparation process of an aluminum plastic film, comprising the following steps:
step S1: coating degreasing passivation solution containing trivalent chromium on the front surface and the back surface of the aluminum foil respectively;
step S2: the aluminum foil obtained in the step S1 is dried through a suspension oven;
step S3: the front surface of the aluminum foil obtained in the step S2 is coated with an adhesive consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and solvent;
step S4: drying the aluminum foil obtained in the step S3 through a suspension oven;
step S5: preheating and preserving the surface of the adhesive of the aluminum foil obtained in the step S4;
step S6: carrying out plasma treatment on the polypropylene film and thermally compounding the polypropylene film on the surface of the aluminum foil adhesive obtained in the step S5;
step S7: dry-compounding the polyamide film to the back surface of the aluminum foil obtained in the step S6;
step S8: and (3) conveying the aluminum foil obtained in the step (S7) into a curing chamber for gradient curing to obtain the aluminum-plastic film.
Preferably, the degreasing passivation solution is an aqueous passivation solution and comprises a silane coupling agent, trivalent chromium salt, nitrate and phosphate.
Preferably, the maleic anhydride modified polyolefin is one or more of maleic anhydride modified polybutene, maleic anhydride modified polyoctene and maleic anhydride modified polypropylene.
Preferably, the coating in step S1 and step S3 is a gravure coating.
Preferably, the plasma treatment causes the surface tension of the polypropylene film to be equal to or greater than 42dyn/cm.
Preferably, the preheating in step S5 comprises a first preheating roll and a second preheating roll, both of which have a temperature of 60 ℃ to 70 ℃.
Preferably, the method further comprises a step S71, wherein the polyester film is laminated on the back surface of the aluminum foil in a dry mode in the step S7.
Preferably, the compounding temperature in step S7 and step S71 is 50 ℃ to 70 ℃.
Preferably, the gradient curing in step S8 includes first stage curing, second stage curing, third stage curing and fourth stage curing;
the curing temperature of the first stage is 40-45 ℃ and the curing time is 3-8H;
the second stage curing temperature is 50-55 ℃ and the curing time is 3H-8H;
the third stage curing temperature is 65-70 ℃ and the curing time is 72-96H;
the fourth stage curing temperature is 40-45 ℃ and the curing time is 1H-3H.
Based on the same principle of the invention, in order to achieve the second object, the invention provides an aluminum plastic film, which sequentially comprises a polypropylene film layer, an adhesive layer composed of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and a solvent, a first trivalent chromium passivation layer, an aluminum foil layer, a second trivalent chromium passivation layer, a first adhesive layer and a polyamide film layer from top to bottom;
or comprises a polypropylene film layer, an adhesive layer consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and a solvent, a first trivalent chromium passivation layer, an aluminum foil layer, a second trivalent chromium passivation layer, a first adhesive layer, a polyamide film layer, a second adhesive layer and a polyester film layer from top to bottom.
Compared with the prior art, the invention has the beneficial effects that:
(1) The front surface of the aluminum foil is coated with an adhesive composed of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and solvent, on one hand, an adhesive compound composed of diisocyanate and glycidyl ether type epoxy resin can enable the polypropylene film to be adhered to the front surface of the aluminum foil; on the other hand, the trivalent chromium passivation layer is formed on the front surface of the aluminum foil after degreasing and passivation, the trivalent chromium passivation layer is provided with chromium oxide and aluminum oxide, the aluminum foil is isolated from being contacted with oxygen, and when the aluminum foil is thermally compounded at a certain temperature, maleic anhydride modified polyolefin is melted and is subjected to interfacial chemical reaction with the chromium oxide and the aluminum oxide to generate a chromium-carbonyl compound and an aluminum-carbonyl compound.
(2) The shrinkage stress of the composite material can be reduced by a low-temperature preheating mode when the polypropylene film is compounded; secondly, the materials are subjected to stepwise heating during gradient curing, so that layered tunnel effect caused by inconsistent shrinkage of the materials of each layer is avoided; meanwhile, the gradient curing obviously improves the yield of the aluminum plastic film, and the stability of the friction coefficient of the surface of the polypropylene film and the deep drawing performance of the product; the method of primary gradient curing avoids the ageing of the adhesive caused by multiple curing, reduces the risk of performance degradation, and can also reduce the production and manufacturing cost of the product.
Drawings
FIG. 1 is a flow chart of the preparation process of the aluminum plastic film.
Fig. 2 is a diagram of the relative positions of a first preheat roll and a second preheat roll according to the present invention.
FIG. 3 is a cross-sectional view of an aluminum plastic film of the present invention.
FIG. 4 is a cross-sectional view of an aluminum plastic film of the present invention.
1, a first preheating roller; 2. a second pre-heating roller; 3. a polypropylene film layer, 4 and an adhesive layer; 5. an aluminum foil layer; 51. a first trivalent chromium passivation layer; 52. the second trivalent chromium passivation layer, 6, the first adhesive layer; 7. a polyamide film layer; 8. a second adhesive layer; 9. a polyester film layer.
Detailed Description
The present invention will be described in detail below with reference to the embodiments shown in the drawings, but it should be understood that the embodiments are not limited to the present invention, and functional, method, or structural equivalents and alternatives according to the embodiments are within the scope of protection of the present invention by those skilled in the art.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The following describes embodiments of the present invention.
Embodiment one:
referring to fig. 1, the embodiment discloses a preparation process of an aluminum plastic film, which comprises the following steps:
step S1: coating degreasing passivation solution containing trivalent chromium on the front surface and the back surface of the aluminum foil respectively; specifically, the coating is micro-concave coating, and the micro-concave coating has the characteristic of uniform coating; the degreasing passivation solution is an aqueous passivation solution and comprises a silane coupling agent, trivalent chromium salt, nitrate and phosphate, wherein the silane coupling agent plays a role in cleaning the front and back surfaces of the aluminum foil, meanwhile, the trivalent chromium salt, the nitrate and the phosphate serve as passivation solutions, trivalent chromium passivation layers are respectively formed on the front and back surfaces of the aluminum foil, and the trivalent chromium passivation layers are provided with chromium oxide and aluminum oxide and isolate the aluminum foil from contact with oxygen.
Step S2: the aluminum foil obtained in the step S1 is dried through a suspension oven; the suspension drying efficiency is high and scratches do not appear on the aluminum foil surface.
Step S3: the front surface of the aluminum foil obtained in the step S2 is coated with an adhesive consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and solvent; specifically, the coating is micro-concave coating, and the micro-concave coating has the characteristic of uniform coating; the maleic anhydride modified polyolefin is one or more of maleic anhydride modified polybutene, maleic anhydride modified polyoctene and maleic anhydride modified polypropylene; the adhesive compound composed of diisocyanate and glycidyl ether type epoxy resin can enable the polypropylene film to be adhered to the front surface of the aluminum foil; on the other hand, the front surface of the aluminum foil forms a trivalent chromium passivation layer after degreasing and passivation, and the trivalent chromium passivation layer is provided with chromium oxide and aluminum oxide and isolates the contact of the aluminum foil and oxygen.
Step S4: drying the aluminum foil obtained in the step S3 through a suspension oven;
step S5: preheating and preserving the surface of the adhesive of the aluminum foil obtained in the step S4; specifically, referring to fig. 2, the preheating includes a first preheating roller 1 and a second preheating roller 2, the temperatures of the first preheating roller 1 and the second preheating roller 2 are 60 ℃ to 70 ℃, and the shrinkage stress of the composite material can be reduced by adopting a low-temperature preheating mode.
Step S6: carrying out plasma treatment on the polypropylene film and thermally compounding the polypropylene film on the surface of the aluminum foil adhesive obtained in the step S5; specifically, the surface tension of the polypropylene film is more than or equal to 42dyn/cm by plasma treatment, so that the wettability of the surface of the polypropylene film after the plasma treatment and the surface of an adhesive are closer and more attached; in the thermal compounding process, maleic anhydride modified polyolefin is melted, so that carbonyl brought by maleic anhydride is subjected to interfacial chemical reaction with chromic oxide and aluminum oxide of a trivalent chromium passivation layer to generate a chromium-carbonyl compound and an aluminum-carbonyl compound, and in addition, the polypropylene film has good wettability and adhesiveness with the maleic anhydride modified polyolefin in the thermal compounding process, so that the adhesiveness between the polypropylene film layer and an aluminum foil is stronger, and the final aluminum plastic film can bear the corrosion of electrolyte.
Step S7: dry-compounding the polyamide film to the back surface of the aluminum foil obtained in the step S6; specifically, a polyamide film is compounded on the surface of a trivalent chromium passivation layer on the back side of the aluminum foil in a dry mode, wherein the polyamide film plays a role of a protective layer; in different usage scenarios, in order to further increase the protection capability of the protection layer, the method further includes step S71, and in step S7, the surface of the aluminum foil polyamide film is dry-laminated with a polyester film.
Step S8: and (3) conveying the aluminum foil obtained in the step (S7) into a curing chamber for gradient curing to obtain the aluminum-plastic film. Specifically, the material is subjected to stepwise temperature rise during gradient curing, so that layered tunnel effect caused by inconsistent shrinkage of each layer of material is avoided; meanwhile, the gradient curing obviously improves the yield of the aluminum plastic film, and the stability of the friction coefficient of the surface of the polypropylene film and the deep drawing performance of the product; the method of primary gradient curing avoids the ageing of the adhesive caused by multiple curing, reduces the risk of performance degradation, and can also reduce the production and manufacturing cost of the product.
In a preferred embodiment, the gradient curing includes a first stage curing, a second stage curing, a third stage curing, and a fourth stage curing; the curing temperature of the first stage is 40-45 ℃ and the curing time is 3-8H; the second stage curing temperature is 50-55 ℃ and the curing time is 3H-8H; the third stage curing temperature is 65-70 ℃ and the curing time is 72-96H; the fourth stage curing temperature is 40-45 ℃ and the curing time is 1H-3H.
In the gradient curing process, a coiled aluminum-plastic film semi-finished product is placed in the same curing chamber and subjected to stepped heating, an adhesive consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and a solvent and the initial adhesive force of a dry composite polyamide film or a polyester film can be increased in a temperature range of the first-stage curing and the second-stage curing, and meanwhile, the temperature rise of the temperature range of the first-stage curing and the second-stage curing is favorable for migration of small molecule auxiliary agents, particularly slipping agents, in the polypropylene film, the polyamide film and the polyester film, but the curing temperature does not reach the softening temperature of the polypropylene film, the polyamide film and the polyester film, the thermal shrinkage degree of the polypropylene film, the polyamide film and the polyester film is low, the aluminum-plastic film can maintain the compounded form to the greatest extent, and the small molecule auxiliary agents, particularly slipping agents, are pulled into the polypropylene film through the attraction of the adhesive, so that the content of the slipping agents on the outer surface of the polypropylene film is reduced, the friction coefficient of the outer surface of the film is improved, the random aluminum-plastic film is prevented from slipping due to the low surface friction coefficient of the coiled aluminum-plastic film, and the problem of the aluminum-plastic film can be effectively avoided in the process of forming a barrel; the third stage of curing temperature interval fixes the product performance in a low-temperature curing mode, and the fourth stage of curing sets a cooling program to reduce the temperature of the whole product to above normal temperature so as to avoid the influence of sudden temperature drop on the product performance. Meanwhile, the gradient curing obviously improves the yield of the aluminum plastic film, and the stability of the friction coefficient of the surface of the polypropylene film and the deep drawing performance of the product; the method of primary gradient curing avoids the ageing of the adhesive caused by multiple curing, reduces the risk of performance degradation, and can also reduce the production and manufacturing cost of the product.
Example one aluminum plastic film preparation process parameters: preheating at 65deg.C, surface tension of polypropylene film 45dyn/cm, thermal compounding at 65deg.C, first stage aging at 45deg.C, and aging for 5H; the second stage curing temperature is 55 ℃ and the curing time is 5H; the third stage curing temperature is 65 ℃ and the curing time is 96H; and the fourth stage of curing temperature is 45 ℃, the curing time is 3H, and the back of the aluminum foil is only compounded with the polyamide film.
Exemplary two aluminum plastic film preparation process parameters: preheating at 65deg.C, surface tension of polypropylene film 45dyn/cm, thermal compounding at 65deg.C, first stage aging at 45deg.C, and aging for 5H; the second stage curing temperature is 55 ℃ and the curing time is 5H; the third stage curing temperature is 65 ℃ and the curing time is 96H; and the fourth stage of curing temperature is 45 ℃, the curing time is 3H, and the back of the aluminum foil is compounded with the polyamide film and the polyester film.
The test results of the aluminum plastic film of the first example and the second example are compared with the test results of the aluminum plastic film of the traditional process according to the standard of aluminum plastic composite film for lithium ion batteries (T/CIAPS 0005-2018), and the test results of the aluminum plastic film of the first example and the second example are shown in table 1, the aluminum plastic film produced by the process of the embodiment has obvious advantages in PP/PP static friction coefficient, PP/PP dynamic friction coefficient and punching depth, the PP/PP static friction coefficient and the PP/PP dynamic friction coefficient are increased, the data distribution range is small and concentrated, the friction coefficient range is more concentrated, the friction force of the aluminum plastic film in the preparation process is increased, the phenomenon of a gun barrel of the aluminum plastic film in the coiling process is reduced, in addition, the concentration of the friction coefficient data distribution range influences the punching depth performance, and the increase of the punching depth is beneficial to improving the toughness and the stability of the aluminum plastic film.
Table 1 shows the comparative results of the aluminum-plastic film of this example and the aluminum-plastic film of the conventional process
Embodiment two:
the aluminum plastic film, see fig. 3, sequentially comprises a polypropylene film layer 3, an adhesive layer 4 composed of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and a solvent, a first trivalent chromium passivation layer 51, an aluminum foil layer 5, a second trivalent chromium passivation layer 52, a first adhesive layer 6 and a polyamide film layer 7 from top to bottom;
or, referring to fig. 4, the adhesive layer 4 composed of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and solvent, the first trivalent chromium passivation layer 51, the aluminum foil layer 5, the second trivalent chromium passivation layer 52, the first adhesive layer 6, the polyamide film layer 7, the second adhesive layer 8 and the polyester film layer 9 are sequentially included from top to bottom.
The second embodiment is prepared by the preparation process of the first embodiment, compared with the existing aluminum plastic film, referring to table 1, the aluminum plastic film produced by the process of the first embodiment has obvious advantages in PP/PP static friction coefficient, PP/PP dynamic friction coefficient and punching depth, PP/PP static friction coefficient and PP dynamic friction coefficient are increased, the data distribution range is small and concentrated, the friction coefficient range is more concentrated, friction force of the aluminum plastic film in the preparation process is increased, the phenomenon of "gun barrel" of the aluminum plastic film in the coiling process is reduced, in addition, the concentration of the friction coefficient data distribution range influences the punching depth performance, and the increase of the punching depth is beneficial to improving the toughness and stability of the aluminum plastic film.
The technical scheme of the aluminum plastic film disclosed in the present embodiment and the embodiment one having the same parts is described in the embodiment one, and is not repeated here.
Claims (10)
1. The preparation process of the aluminum plastic film is characterized by comprising the following steps of:
step S1: coating degreasing passivation solution containing trivalent chromium on the front surface and the back surface of the aluminum foil respectively;
step S2: the aluminum foil obtained in the step S1 is dried through a suspension oven;
step S3: the front surface of the aluminum foil obtained in the step S2 is coated with an adhesive consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and solvent;
step S4: drying the aluminum foil obtained in the step S3 through a suspension oven;
step S5: preheating and preserving the surface of the adhesive of the aluminum foil obtained in the step S4;
step S6: carrying out plasma treatment on the polypropylene film and thermally compounding the polypropylene film on the surface of the aluminum foil adhesive obtained in the step S5;
step S7: dry-compounding the polyamide film to the back surface of the aluminum foil obtained in the step S6;
step S8: and (3) conveying the aluminum foil obtained in the step (S7) into a curing chamber for gradient curing to obtain the aluminum-plastic film.
2. The process for preparing the aluminum plastic film according to claim 1, wherein,
the oil removal passivation solution is an aqueous passivation solution and comprises a silane coupling agent, trivalent chromium salt, nitrate and phosphate.
3. The process for preparing the aluminum plastic film according to claim 1, wherein,
the maleic anhydride modified polyolefin is one or more of maleic anhydride modified polybutene, maleic anhydride modified polyoctene and maleic anhydride modified polypropylene.
4. The process for preparing an aluminum plastic film according to claim 1, wherein the coating in the step S1 and the step S3 is a micro-gravure coating.
5. The process for preparing an aluminum plastic film according to claim 1, wherein the surface tension of the polypropylene film is not less than 42dyn/cm by plasma treatment.
6. The process for producing an aluminum-plastic film according to claim 1, wherein the preheating in step S5 comprises a first preheating roller and a second preheating roller, each having a temperature of 60 ℃ to 70 ℃.
7. The process for preparing an aluminum plastic film according to claim 1, further comprising step S71, wherein the aluminum foil is reverse-side dry-type composite polyester film in step S7.
8. The process for preparing an aluminum-plastic film according to claim 7, wherein the compounding temperature in the step S7 and the step S71 is 50-70 ℃.
9. The process for producing an aluminum-plastic film according to any one of claims 1 to 8, wherein the gradient curing in step S8 includes a first stage curing, a second stage curing, a third stage curing and a fourth stage curing;
the curing temperature of the first stage is 40-45 ℃ and the curing time is 3-8H;
the second stage curing temperature is 50-55 ℃ and the curing time is 3H-8H;
the third stage curing temperature is 65-70 ℃ and the curing time is 72-96H;
the fourth stage curing temperature is 40-45 ℃ and the curing time is 1H-3H.
10. The aluminum plastic film is characterized by sequentially comprising a polypropylene film layer, an adhesive layer consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and a solvent, a first trivalent chromium passivation layer, an aluminum foil layer, a second trivalent chromium passivation layer, a first adhesive layer and a polyamide film layer from top to bottom;
or comprises a polypropylene film layer, an adhesive layer consisting of maleic anhydride modified polyolefin, diisocyanate, glycidyl ether type epoxy resin and a solvent, a first trivalent chromium passivation layer, an aluminum foil layer, a second trivalent chromium passivation layer, a first adhesive layer, a polyamide film layer, a second adhesive layer and a polyester film layer from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311706955.4A CN117625050A (en) | 2023-12-13 | 2023-12-13 | Preparation process of aluminum plastic film and aluminum plastic film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311706955.4A CN117625050A (en) | 2023-12-13 | 2023-12-13 | Preparation process of aluminum plastic film and aluminum plastic film |
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| CN117625050A true CN117625050A (en) | 2024-03-01 |
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| CN202311706955.4A Pending CN117625050A (en) | 2023-12-13 | 2023-12-13 | Preparation process of aluminum plastic film and aluminum plastic film |
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