Heat-seal layer material for al-plastic film, al-plastic film, and method for producing the same

Abstract

The application relates to the field of packaging materials, and particularly discloses an aluminum-plastic film heat-sealing layer material, an aluminum-plastic film and a preparation method thereof. The aluminum-plastic film heat-sealing layer material is composed of the following raw materials in parts by weight: 100 parts of polypropylene masterbatch, 10-18 parts of a modified repairing agent, 3-5 parts of a curing agent and 0.5-2 parts of an additive; the modified repairing agent is a microcapsule with hyperbranched polypropylene as a shell and bisphenol A type epoxy resin as a core. In the application, the polypropylene masterbatch is used as the main material of the heat-sealing layer, and the modified repairing agent and the curing agent are used in combination, which improves the crosslinking strength of the heat-sealing layer and the self-repairing performance of the heat-sealing layer, thereby improving the puncture resistance of the heat-sealing layer; on the other hand, the polypropylene is modified by the hyperbranched polypropylene, the residual orientation at the interface of the heat-sealing layer is reduced, the interface fitting is promoted, and the heat-sealing strength between the heat-sealing layers is significantly improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of packaging materials, in particular to a heat-sealing layer material for an aluminum-plastic film, an aluminum-plastic film and a preparation method thereof. BACKGROUND

[0002] The aluminum-plastic film is an outer packaging material for a soft-packaged lithium battery, and the main structure thereof generally comprises an outer protective layer, an intermediate aluminum foil layer and an inner heat-sealing layer which are sequentially stacked. The three layers are bonded and formed by an adhesive. The outer protective layer of the aluminum-plastic film is mainly used for protecting the intermediate aluminum foil layer, so that the aluminum foil layer is scratch-free; the intermediate aluminum foil layer can play a good barrier role to prevent moisture from invading and block oxygen; and the inner heat-sealing layer can play a role of resisting electrolyte corrosion. The inner heat-sealing layer of the aluminum-plastic film is heated and bonded, and the cell packaging is completed.

[0003] However, in the actual cell packaging process, the aluminum-plastic film needs to be subjected to multiple vacuum extraction treatments, and in addition, the cell itself has burrs. When the heat-sealing layer is bonded, the burrs can pierce the inner heat-sealing layer, which easily causes the heat-sealing layer to have notches, thereby affecting the electrolyte resistance of the aluminum-plastic film.

[0004] In the related art, high-strength fillers such as graphene are generally added to the heat-sealing layer in the expectation that the puncture resistance of the heat-sealing layer can be improved. However, since the heat-sealing layer material is generally polypropylene, the compatibility of the graphene filler with the polypropylene is poor, and the addition of the graphene filler to the polypropylene easily causes the heat-sealing strength of the polypropylene to decrease and the heat-sealing performance to deteriorate.

[0005] In view of the above problems, there is an urgent need in the industry to develop a heat-sealing layer material which can simultaneously have excellent heat-sealing strength and puncture resistance. SUMMARY

[0006] In order to solve the problem that the heat-sealing layer material cannot simultaneously have excellent puncture resistance and heat-sealing strength, the application provides a heat-sealing layer material for an aluminum-plastic film, an aluminum-plastic film and a preparation method thereof.

[0007] In a first aspect, the application provides a heat-sealing layer material for an aluminum-plastic film, which adopts the following technical solution:

[0008] The heat-sealing layer material for the aluminum-plastic film is composed of the following raw materials by weight:

[0009]

[0010] The modified repair agent is a microcapsule with hyperbranched polypropylene as a shell and bisphenol A type epoxy resin as a core.

[0011] In the application, polypropylene masterbatch is used as the main material of the heat-sealing layer, and the use of the modified repair agent and the curing agent in combination enables the heat-sealing layer material for the aluminum-plastic film prepared in the application to have the following advantages:

[0012] Firstly, since the outer layer of the modified repair agent is hyperbranched polypropylene, the hyperbranched polypropylene has excellent compatibility with the polypropylene masterbatch, so that the modified repair agent can be uniformly dispersed in the polypropylene masterbatch, so that the heat sealing layer is uniformly distributed with bisphenol A type epoxy resin. When the burr pierces the modified repair agent, the bisphenol A type epoxy resin inside the modified repair agent flows out and contacts the curing agent in the heat sealing layer, which can be quickly cured; on the one hand, by reducing the possibility of holes in the heat sealing layer during the heat sealing process, the heat sealing layer has excellent puncture resistance; on the other hand, even if part of the bisphenol A type epoxy resin leaks during the flow film forming process, it can also react with the curing agent, thereby improving the crosslinking strength of the heat sealing layer and further improving the puncture resistance of the heat sealing layer.

[0013] Secondly, since the hyperbranched polypropylene has high branching degree and low crystallinity, on the one hand, it can reduce the hot melting temperature of the heat sealing layer and reduce the possibility of heat aging of the heat sealing layer, thereby prolonging the service life of the aluminum plastic film and improving the electrolyte resistance of the aluminum plastic film; on the other hand, the hyperbranched polypropylene has many branches, which can effectively reduce the residual orientation at the interface of the heat sealing layer, help to promote the intercalation between the polymers of the heat sealing layer, so that the melts of the two heat sealing layers can be completely merged in a short time, and the interface intercalation reaches a high strength, thereby the heat sealing strength between the heat sealing layers is significantly improved, and the initial packaging strength can reach 118N / 15mm, and the packaging strength after 28 days can also be maintained at 88N / 15mm.

[0014] In summary, by using the modified repair agent and the curing agent in the application, the heat sealing layer material can have excellent puncture resistance and excellent heat sealing strength.

[0015] Optionally, the preparation method of the modified repair agent is as follows:

[0016] Under a nitrogen atmosphere, preheat to a reaction temperature of 35-60℃, first add bisphenol A type epoxy resin, then mix propylene monomer and diimine nickel / palladium transition metal catalyst into the bisphenol A type epoxy resin, stir and disperse at a speed of 1000-3000rpm, and react for 6-12h, then purify to obtain the modified repair agent;

[0017] The weight ratio of the propylene monomer, the bisphenol A type epoxy resin and the diimine nickel / palladium transition metal catalyst is 1:(1.2-1.8):(0.01-0.02).

[0018] By adopting the above technical scheme, the diimine nickel / palladium transition metal catalyst includes but is not limited to di-(2,6-diisopropylphenyl) butanediamine nickel bromide and di-(phenyl) pentanediamine nickel bromide; the diimine nickel / palladium transition metal catalyst can make the propylene monomer undergo chain transfer in the polymerization process to form hyperbranched polypropylene; since the bisphenol A type epoxy resin has no reactive functional group with the hyperbranched polypropylene, the bisphenol A type epoxy resin can be coated by the hyperbranched polypropylene to form a microcapsule structure with the bisphenol A type epoxy resin as the core and the hyperbranched polypropylene as the shell.

[0019] Preferably, the weight ratio of the propylene monomer, the bisphenol A type epoxy resin and the diimine nickel / palladium transition metal catalyst is 1:(1.2-1.4):0.015.

[0020] Preferably, in the preparation method of the modified repair agent, the reaction temperature is 40-45℃.

[0021] By adopting the above technical scheme, the ratio of the propylene monomer, the bisphenol A type epoxy resin and the catalyst and the reaction temperature are adjusted to adjust the content of the bisphenol A type resin and the hyperbranched polypropylene in the modified repair agent, so that the aluminum-plastic film can improve the puncture resistance and have excellent heat sealing strength.

[0022] Optionally, the weight ratio of the polypropylene master batch and the modified repair agent is 1:(0.12-0.15). Preferably, the weight ratio of the polypropylene master batch and the modified repair agent is 1:0.14.

[0023] By adopting the above technical scheme, the addition amount of the modified repair agent is adjusted to make the melt flow rate of the heat sealing layer material moderate, so as to avoid the problem that when the addition amount of the modified repair agent continuously increases, the interfacial cohesion of the heat sealing layer material is destroyed, and the heat sealing strength is instead reduced.

[0024] Optionally, the weight ratio of the polypropylene master batch and the curing agent is 1:0.04.

[0025] Preferably, the curing agent is compounded by a fatty amine and an aromatic amine according to a weight ratio of 1:(0.5-1).

[0026] By adopting the above technical scheme, the selection of the curing agent includes but is not limited to polyamide, fatty amine (high-carbon fatty amine), aromatic amine and alicyclic amine; in this application, the fatty amine and the aromatic amine are compounded, the long chain of the fatty amine improves the compatibility between the curing agent and the polypropylene material, and the stable benzene ring structure contained in the aromatic amine endows the heat sealing layer with excellent electrolyte resistance and improves the heat sealing strength after 28 days; therefore, the fatty amine and the aromatic amine have a synergistic effect in improving the heat sealing strength of the heat sealing layer.

[0027] Optionally, the auxiliary agent is compounded by an antioxidant and an anti-hydrolysis agent in a weight ratio of 1:(1-1.5).

[0028] The auxiliary agent includes but is not limited to an antioxidant and an anti-hydrolysis agent. The antioxidant includes but is not limited to 2,6-tert-butyl-4-methylphenol, bis(3,5-tert-butyl-4-hydroxyphenyl) sulfide, and tetra[β-(3,5-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester. The anti-hydrolysis agent includes but is not limited to a carbodiimide. By adopting the above technical solution, the antioxidant and the anti-hydrolysis agent are compounded, which plays a synergistic role in improving the puncture resistance, heat sealing performance, and electrolyte resistance of the aluminum-plastic film; the antioxidant reduces the possibility of aging of the heat sealing layer material, and the carbodiimide can further react with bisphenol A type epoxy resin to generate polyurea, thereby improving the heat sealing performance and electrolyte resistance of the heat sealing layer material.

[0029] In a second aspect, the application provides an aluminum-plastic film, which adopts the following technical solution:

[0030] An aluminum-plastic film includes a heat sealing layer, which is obtained by flow casting the aluminum-plastic film heat sealing layer material.

[0031] By adopting the above technical solution, the aluminum-plastic film has excellent puncture resistance, and the maximum load can reach N. Even if the needle is inserted into the heat sealing layer and then pulled out, no hole will appear in the heat sealing layer after heating. In addition, the initial packaging strength of the aluminum-plastic film can reach 118 N / 15 mm, and the packaging strength after 28 days can also be maintained at 88 N / 15 mm, which has excellent heat sealing performance and electrolyte resistance.

[0032] In a third aspect, the application provides a preparation method of an aluminum-plastic film, which adopts the following technical solution:

[0033] The preparation method of the aluminum-plastic film includes the following steps:

[0034] Flow casting the aluminum-plastic film heat sealing layer material to obtain a heat sealing layer base film;

[0035] Passivating the aluminum foil to obtain an aluminum foil layer;

[0036] Coating a primer on the heat sealing layer base film, and extruding and bonding the aluminum foil layer to the heat sealing layer base film, and aging;

[0037] Taking an outer protective layer base film, coating a primer on the outer protective layer base film, extruding and bonding the aluminum foil layer to the outer protective layer base film, and aging to obtain the aluminum-plastic film.

[0038] By adopting the above technical solution, the preparation process of the aluminum-plastic film is simple, the performance is excellent, and the aluminum-plastic film has broad market prospects.

[0039] In summary, the application has the following beneficial effects:

[0040] 1、The application uses modified repair agent and curing agent to make the heat-sealing layer material of aluminum-plastic film have puncture repair performance and high cross-linking strength, thereby having excellent puncture resistance. At the same time, due to the high branching degree and low crystallinity of hyperbranched polypropylene, the residual orientation at the interface of the heat-sealing layer can be effectively reduced, which helps to promote the intercalation between the heat-sealing layer polymers, so that the melts of the two heat-sealing layers can completely merge in a short time, the interface intercalation reaches a high strength, thereby significantly improving the heat-sealing strength between the heat-sealing layers, and the initial packaging strength can reach 118 N / 15 mm, and the packaging strength after 28 days can also be maintained at 88 N / 15 mm.

[0041] 2、The application uses a mixture of aliphatic amine and aromatic amine to further improve the heat-sealing strength of the heat-sealing layer.

[0042] 3、The application adds an anti-hydrolysis agent carbodiimide to the heat-sealing layer material, which can further react with bisphenol A type epoxy resin to generate polyurea, thereby improving the heat-sealing performance and electrolyte resistance of the heat-sealing layer material. DETAILED DESCRIPTION

[0043] The application will be further described in detail below in combination with preparation examples and examples.

[0044] Preparation example of diimine nickel / palladium transition metal catalyst

[0045] Preparation example A

[0046] The di-(2,6-diisopropylphenyl)butanediamine nickel bromide was prepared according to the following steps:

[0047] S1, 141.6g of 2,6-diisopropylaniline and 17.2g of butanedione were mixed in a weight ratio, then dissolved in 400mL of toluene, and 1g of p-methylbenzenesulfonic acid was added; the obtained solution was stirred and refluxed at 80℃ for 24h, and then refluxed at 120℃ for 3 days until the raw materials were completely reacted. The obtained reaction solution was cooled to 20℃, then part of the toluene was evaporated under reduced pressure until yellow solid appeared, then the evaporated reaction solution was diluted with 300mL of anhydrous ethanol, at this time a large amount of yellow solid was precipitated; the obtained yellow solid was collected by filtration and washed with ethanol to obtain pure α-diimine ligand;

[0048] S2, under a nitrogen atmosphere, 56.2g of α-diimine ligand, 6.2g of (DME)NiBr2 and 50mL of dichloromethane were taken. The obtained mixture was stirred at 20℃ overnight, and the solvent was removed under reduced pressure to obtain red solid, which was washed with 3×100mL of anhydrous ether to obtain pure di-(2,6-diisopropylphenyl)butanediamine nickel bromide.

[0049] Preparation example of modified repair agent

[0050] Preparation Example 1

[0051] The modified repair agent was prepared according to the following preparation method:

[0052] Take propylene monomer 100 g, bisphenol A type epoxy resin (brand: NPEL-128) 120 g, and nickel bromide of di-(2,6-diisopropylphenyl) butanediamine prepared in preparation example a 1 g;

[0053] First, dry the reactor at 90°C under vacuum for at least 1 hour, then adjust the reactor to the desired polymerization temperature of 35°C; add bisphenol A type epoxy resin to the reactor under nitrogen atmosphere;

[0054] Then add the mixed solution of dichloromethane and propylene monomer to the reactor under nitrogen atmosphere, and then inject the dichloromethane solution containing the desired diimine palladium catalyst into the polymerization system through a syringe. Under the premise of continuous stirring at 1000 rpm, the reactor is pressurized and maintained at a propylene pressure of 4 atm for 12 h, then the reactor is vented, the copolymer is precipitated with ethanol, and the polymer is vacuum dried at 50°C for 12 h to obtain the modified repair agent.

[0055] Preparation Examples 2-5

[0056] The modified repair agent is different from preparation example 1 in that the weight ratio of propylene monomer, bisphenol A type epoxy resin and diimine nickel / palladium transition metal catalyst is different;

[0057] Among them, in preparation example 2, take propylene monomer 100 g, bisphenol A type epoxy resin (brand: NPEL-128) 140 g, and nickel bromide of di-(2,6-diisopropylphenyl) butanediamine prepared in preparation example a 1 g;

[0058] In preparation example 3, take propylene monomer 100 g, bisphenol A type epoxy resin (brand: NPEL-128) 180 g, and nickel bromide of di-(2,6-diisopropylphenyl) butanediamine prepared in preparation example a 1 g;

[0059] In preparation example 4, take propylene monomer 100 g, bisphenol A type epoxy resin (brand: NPEL-128) 140 g, and nickel bromide of di-(2,6-diisopropylphenyl) butanediamine prepared in preparation example a 2 g;

[0060] In preparation example 5, take propylene monomer 100 g, bisphenol A type epoxy resin (brand: NPEL-128) 140 g, and nickel bromide of di-(2,6-diisopropylphenyl) butanediamine prepared in preparation example a 1.5 g.

[0061] Preparation Example 6

[0062] A modified repair agent is prepared according to the following preparation method:

[0063] Take 100 g of propylene monomer, 140 g of bisphenol A type epoxy resin (brand: NPEL-128), and 1.5 g of nickel bis-(2,6-diisopropylphenyl) butanediamine prepared by preparation example a;

[0064] First, dry the reactor at 90°C under vacuum for at least 1 hour, then adjust the reactor to the desired polymerization temperature of 60°C; add bisphenol A type epoxy resin to the reactor under a nitrogen atmosphere;

[0065] Then add a mixed solution of dichloromethane and propylene monomer to the reactor under a nitrogen atmosphere, and then inject a dichloromethane solution containing the desired diimine palladium catalyst into the polymerization system through a syringe. Under the premise of continuous stirring at 3000 rpm, the reactor is pressurized and maintained at a propylene pressure of 4 atm for 6 h, then the reactor is vented, the copolymer is precipitated with ethanol, and the polymer is vacuum dried at 50°C for 12 h to obtain the modified repair agent.

[0066] Preparation examples 7-8

[0067] The modified repair agent differs from example 6 in that the reaction temperature and reaction time are different;

[0068] The reaction temperature of preparation example 7 is 40°C, and the reaction time is 10 h;

[0069] The reaction temperature of preparation example 8 is 45°C, and the reaction time is 8 h.

[0070] Example

[0071] Example 1

[0072] A heat-sealing layer material for an aluminum-plastic film is prepared according to the following steps:

[0073] Take 100 parts by weight of polypropylene masterbatch (brand: kjml-01), 10 parts by weight of the modified repair agent prepared by preparation example 1, 3 parts by weight of curing agent aliphatic diamine (brand: ) and 1010 parts by weight of antioxidant;

[0074] Mix and melt the polypropylene masterbatch, the curing agent aliphatic diamine and the antioxidant 1010, add the modified repair agent to the melt, and then pour it into a flow machine to form a film, to obtain the heat-sealing layer material.

[0075] Examples 2-8

[0076] An aluminum-plastic film, which differs from example 1 in that the source of the modified repair agent in the heat-sealing layer material is different, as shown in the following table 3:

[0077] Table 1. Sources of the modified healing agent

[0078] Item Source of modified repair agent Item Source of modified repair agent Example 1 Preparation 1 Example 5 Preparation 5 Example 2 Preparation 2 Example 6 Preparation 6 Example 3 Preparation 3 Example 7 Preparation 7 Example 4 Preparation 4 Example 8 Preparation 8

[0079] Examples 9-23

[0080] Aluminum-plastic film, the difference between the example 8 is that the polypropylene masterbatch, modified healing agent, curing agent and the type and amount of additives in the heat-sealing layer, as shown in Table 2 below.

[0081] Table 2. Composition of heat-sealing layer material

[0082]

[0083]

[0084] Comparative example

[0085] Comparative example 1

[0086] Aluminum-plastic film, the difference between the example 1 is that the use of hyperbranched polypropylene instead of modified healing agent;

[0087] The preparation method of the hyperbranched polypropylene is as follows:

[0088] First, dry the reactor at 90°C under vacuum for at least 1 hour, then adjust the reactor to the desired polymerization temperature of 35°C. Add a mixed solution of dichloromethane, 220 g of propylene monomer to the reactor under nitrogen atmosphere, then inject a dichloromethane solution containing bis-(2,6-diisopropylphenyl) butanediamine nickel bromide into the polymerization system through a syringe. After rapid stirring, the reactor is pressurized and maintained at a propylene pressure of 4 atm for 12 h, then antioxidant 1010 is added and stirred, the reactor is vented, the copolymer is precipitated with ethanol, and the polymer is vacuum dried at 50°C for 12 h to obtain the hyperbranched polypropylene.

[0089] Comparative examples 2-4

[0090] Aluminum-plastic film, the difference between the example 1 is that the composition of the heat-sealing layer material is different, the specific composition is shown in Table 3 below.

[0091] Table 3. Composition of heat-sealing layer material

[0092]

[0093] Application examples and comparative examples

[0094] Application example 1

[0095] An aluminum-plastic film is prepared according to the following steps:

[0096] The heat seal layer material obtained in Example 1 was stretched to a thickness of 55 μm to obtain a heat seal layer;

[0097] The aluminum foil was subjected to surface cleaning treatment using Ar2 as working gas, and then passivated to obtain an aluminum foil layer having a thickness of 40 μm;

[0098] An epoxy primer (trade name: DY.E44) was coated on one side of the heat seal layer, and the heat seal layer and the aluminum foil layer were attached and extrusion-bonded, and then sent into a curing chamber for curing;

[0099] An epoxy primer (trade name: DY.E44) was coated on the base film of the nylon PA-66 outer protective layer, and the outer protective layer and the aluminum foil layer were attached and extrusion-bonded, and then sent into a curing chamber for curing to obtain an aluminum-plastic film.

[0100] Application Example 2-23 and Application Comparative Example 1-4

[0101] An aluminum-plastic film, which differed from that of Application Example 1 in that the source of the material used for the heat seal layer was different, and the specific sources are shown in Table 4.

[0102] Table 4. Source of heat seal layer material

[0103] Item Heat seal layer material Item Adhesive layer material Item Adhesive layer material Use Example 2 Example 2 Use Example 11 Example 11 Use Example 20 Example 20 Use Example 3 Example 3 Use Example 12 Example 12 Use Example 21 Example 21 Use Example 4 Example 4 Use Example 13 Example 13 Use Example 22 Example 22 Use Example 5 Example 5 Use Example 14 Example 14 Use Example 23 Example 23 Use Example 6 Example 6 Use Example 15 Example 15 Use Comparative Example 1 Comparative Example 1 Use Example 7 Example 7 Use Example 16 Example 16 Use Comparative Example 2 Comparative Example 2 Use Example 8 Example 8 Use Example 17 Example 17 Use Comparative Example 3 Comparative Example 3 Use Example 9 Example 9 Use Example 18 Example 18 Use Comparative Example 4 Comparative Example 4 Use Example 10 Example 10 Use Example 19 Example 19

[0104] Performance detection

[0105] Detection method

[0106] Forming depth: The sample (200 mm x 110 mm) was formed at different depths (97 mm x 55 mm), and whether the sample had cracking, grooves, pitting, delamination, etc. was observed. The punch pit depth was recorded.

[0107] Puncture resistance: According to the provisions of "6.6.13 Puncture Strength" in GB / T 10004-2008, a 1 mm puncture needle was used to puncture the aluminum-plastic film from the side of the heat seal layer, and the maximum load at which the needle penetrated the aluminum-plastic film was recorded. Then, the puncture needle was inserted into the heat seal layer and pulled out, and the heat seal layer was heated to observe whether holes appeared on the heat seal layer.

[0108] Electrolyte resistance: The aluminum-plastic film sample was heat sealed into a battery bag (100 mm x 200 mm) with a heat seal thickness controlled at 20% of the hot melt, 3 g of electrolyte (water content 1000 ppm) was injected, and the battery bag was placed in a constant temperature and humidity chamber at 60°C and 90% RH. The sealing strength of the battery bag was tested at 0 days and 28 days. The battery bag was observed for leakage and delamination, and if there was no leakage or delamination, it was considered to be in a qualified state, otherwise it was not qualified.

[0109] Detection results

[0110] Table 5. Performance detection of aluminum-plastic film

[0111]

[0112]

[0113] It can be seen from application example 1 and application comparative example 1 and table 5 that: the hyperbranched polypropylene as a modifier can only improve the forming punch depth of the heat-sealing layer material, and the processing performance is excellent, but the puncture resistance, heat-sealing performance and electrolyte resistance of the heat-sealing layer material are not improved.

[0114] It can be seen from application example 1 and application comparative examples 2-3 and table 5 that: the addition amount of the modified repair agent needs to be strictly controlled. When the addition amount of the modified repair agent is too low, the modified repair agent has no obvious improvement effect on the puncture resistance, heat-sealing performance and electrolyte resistance of the heat-sealing layer material, and it is difficult to repair the hole. The reason may be that the addition amount of the modified repair agent is too low, and the bisphenol A type epoxy resin in the heat-sealing layer cannot effectively repair.

[0115] When the addition amount of the modified repair agent is too high, the content of the corresponding hyperbranched polypropylene is too high, and the heat-sealing strength decreases. The reason may be that the hyperbranched polypropylene promotes the intercalation effect less than the interfacial cohesive failure, thereby causing the heat-sealing strength to decrease.

[0116] It can be seen from application example 1 and application comparative example 4 and table 5 that: the addition amount of the curing agent also needs to be strictly controlled. When the addition amount of the curing agent is too high, the heat-sealing strength of the heat-sealing layer material decreases significantly due to the poor compatibility between the curing agent and the polypropylene material. When the curing agent reaches a certain amount, the hydrogen bonding between the curing agent and the electrolyte is good, thereby causing the electrolyte resistance of the heat-sealing layer material to decrease significantly.

[0117] It can be seen from application example 1 and application examples 11, 13-18 and table 5 that: when the curing agent is an aromatic amine, the initial heat-sealing strength and 28-day heat-sealing strength of the heat-sealing layer material decrease. However, when the fatty amine and the aromatic amine are compounded, the performance of the heat-sealing layer material can be significantly improved, indicating that the fatty amine and the aromatic amine have a synergistic effect in improving the heat-sealing performance and electrolyte resistance of the heat-sealing layer material.

[0118] The specific embodiments are merely illustrative of the present application, and are not intended to limit the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A heat-sealing layer material for aluminum-plastic film, characterized by: It is composed of the following raw materials in parts by weight: 100 parts of polypropylene masterbatch; 10-18 parts of modified repair agent; 3-5 parts of curing agent; 0.5-2 parts of additives; The modified repair agent is a microcapsule with hyperbranched polypropylene as the shell and bisphenol A epoxy resin as the core; The preparation method of the modified repair agent is as follows: preheating to a reaction temperature of 35 to 60° C. under a nitrogen atmosphere, first adding bisphenol A epoxy resin, then mixing propylene monomer and diimide nickel / palladium transition metal catalyst and adding them to the bisphenol A epoxy resin, stirring and dispersing at a speed of 1000 to 3000 rpm, keeping the temperature for reaction for 6 to 12 hours, and purifying to obtain the modified repair agent; The weight ratio of propylene monomer, bisphenol A epoxy resin and diimide nickel / palladium transition metal catalyst is 1:(1.2-1.8):(0.01-0.02); The curing agent is prepared by compounding aliphatic amine and aromatic amine in a weight ratio of 1: (0.5-1).

2. The heat-sealing layer material for aluminum-plastic film according to claim 1, wherein: In the preparation method of the modified repair agent, the weight ratio of the propylene monomer, bisphenol A epoxy resin and diimine nickel / palladium transition metal catalyst is 1:(1.2-1.4):0.

015.

3. The heat-sealing layer material for aluminum-plastic film according to claim 1, wherein: In the preparation method of the modified repair agent, the reaction temperature is 40-45°C.

4. The heat-sealing layer material for aluminum-plastic film according to claim 1, wherein: The weight ratio of the polypropylene masterbatch to the modifying and repairing agent is 1:(0.12-0.15).

5. The heat-sealing layer material for aluminum-plastic film according to claim 1, wherein: The weight ratio of the polypropylene masterbatch to the curing agent is 1:0.

04.

6. The heat-sealing layer material for aluminum-plastic film according to claim 1, wherein: The auxiliary agent is prepared by compounding an antioxidant and an anti-hydrolysis agent in a weight ratio of 1: (1 to 1.5).

7. Aluminum-plastic film, including a heat-sealing layer, characterized in that: The heat-sealing layer is obtained by casting the heat-sealing layer material for aluminum-plastic film according to any one of claims 1 to 6.

8. The method for preparing the aluminum-plastic film according to claim 7, wherein: The steps include: The aluminum-plastic film is cast into a film using a heat-sealing layer material, and stretched to obtain a heat-sealing layer base film; Passivation treatment of the aluminum foil to obtain an aluminum foil layer; Apply primer on the heat-sealing layer base film, extrude and bond it to the aluminum foil layer, and then cure; Then take the outer protective layer base film, apply primer on the outer protective layer base film, extrude and bond it with the aluminum foil layer, and cure it to obtain the aluminum-plastic film.

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