A new energy battery packaging film and its preparation method

Abstract

This invention relates to the field of aluminum-plastic film outer layer materials for battery packaging, and discloses a new energy battery packaging film and its preparation method. The preparation method is as follows: under the action of a free radical initiator in a molten state, a self-made graft monomer is grafted onto the molecular backbone of LLDPE resin through a free radical graft copolymerization reaction to obtain epoxy-based LLDPE masterbatch; based on the epoxy-amine ring-opening reaction mechanism, the epoxy-based LLDPE masterbatch is melt-blended with PA6 resin to generate a bridged PA6-LLDPE composite masterbatch, which is then blow-molded to obtain a PA6-LLDPE film; the PA6-LLDPE film is used to replace the outer PA6 film in the aluminum-plastic film to obtain the new energy battery packaging film. The PA6-LLDPE film product prepared by this invention can replace the pure PA6 film on the outer layer of the aluminum-plastic film for packaging batteries with high drop risk and low burr during assembly, thereby achieving the beneficial technical effect of reducing the overall production cost of aluminum-plastic film.

Description

Technical Field

[0001] This invention relates to the technical field of aluminum-plastic film outer layer materials for battery packaging, and particularly to a new energy battery packaging film and its preparation method. Background Technology

[0002] New energy batteries refer to advanced battery technologies used to store and release electrical energy. Currently, the mainstream technologies include lithium-ion batteries, sodium-ion batteries, and solid-state batteries. The packaging materials for lithium-ion batteries, which dominate the market, include steel shells, aluminum shells, and soft packaging. The preferred material for soft packaging is aluminum-plastic film. The main structure of the product consists of an inner heat-sealing layer (made of cast polypropylene CPP, polyethylene PE, and ethylene-acrylic acid copolymer EAA), an aluminum foil layer, and an outer buffer protective layer. The material of this protective layer is mainly polyamide PA.

[0003] Because the raw material cost of PA6 is relatively high (PA6 price is about 10,300-21,500 RMB / ton), while the raw material price of polyethylene LLDPE is relatively low (only 7,000-7,500 RMB / ton), in the outer layer design, it is proposed to use LLDPE to replace part of PA6 to reduce the overall production cost of aluminum-plastic film.

[0004] However, LLDPE is a non-polar polymer, while PA6 is a highly polar polymer. This significant difference in polarity results in extremely poor interfacial compatibility between LLDPE and PA6, with very weak intermolecular forces. It is difficult to achieve a strong and reliable bond between LLDPE and PA6 at the contact surface through a simple co-extrusion process. In other words, the interlayer bonding force of directly extruded composite films is very low, and they are prone to delamination, which cannot meet the performance requirements of aluminum-plastic films.

[0005] The references cited in this invention are as follows:

[0006] Zhang Wenhong's master's thesis, "Synthesis and Characterization of Functionalized POSS Monomers," published by Zhejiang University in 2010, disclosed the chemical structure and synthesis method of isobutoxyheptaphenyltitanium silsesquioxane Ti-POSS. Summary of the Invention

[0007] To address the problem of poor interfacial compatibility between LLDPE and PA6 resins when replacing some of the high-cost PA6 resin with low-cost LLDPE resin, this invention develops a graft monomer containing siloxane groups to bridge the interface between LLDPE and PA6. The resulting PA6-LLDPE film product maintains mechanical properties close to those of pure PA6 film while partially replacing expensive PA6 raw materials and directly replacing commonly used maleic anhydride polyethylene adhesive, thereby achieving the technical goal of reducing the overall production cost of aluminum-plastic film.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for preparing a new energy battery packaging film includes the following steps:

[0010] Step 1: Based on the siloxane condensation reaction mechanism, using diphenyldimethoxysilane or dihydroxyphenylsiloxy Ti-POSS as the bridging structure, and providing functional group raw materials from vinyldimethylethoxysilane and (3-epoxypropoxypropyl)dimethylethoxysilane, siloxane-type graft monomers containing vinyl and epoxy groups or siloxane@Ti-POSS-type graft monomers are synthesized.

[0011] Step 2: Under the action of a molten state and a free radical initiator, the grafting monomer is grafted onto the molecular backbone of LLDPE resin through a free radical graft copolymerization reaction to obtain epoxy-based LLDPE masterbatch.

[0012] Step 3: Based on the epoxy-amine ring-opening reaction mechanism, epoxy-based LLDPE masterbatch and PA6 resin are melt-blended to generate a bridged PA6-LLDPE composite masterbatch. The composite masterbatch is then blow-molded to produce a PA6-LLDPE film.

[0013] Step 4: Replace the outer layer of PA6 film in the aluminum-plastic film with PA6-LLDPE film to obtain a new energy battery packaging film.

[0014] Preferably, the method for preparing the siloxane-type grafted monomer is as follows:

[0015] Using toluene and deionized water as a mixed solvent, diphenyldimethoxysilane is first hydrolyzed, and then undergoes a condensation reaction with the hydrolysis product of vinyldimethylethoxysilane under the catalysis of dibutyltin dilaurate. Subsequently, it undergoes a condensation reaction with the hydrolysis product of (3-epoxypropoxypropyl)dimethylethoxysilane. The molar ratio of diphenyldimethoxysilane, vinyldimethylethoxysilane and (3-epoxypropoxypropyl)dimethylethoxysilane is controlled to be 1:(0.9-0.99):(1.0-1.1) to prepare a siloxane-type grafted monomer.

[0016] Preferably, the method for preparing the siloxane@Ti-POSS type grafted monomer is as follows:

[0017] The isobutoxy functional group in isobutoxyheptaphenyltitanium silsesquioxane Ti-POSS undergoes a deisobutanol reaction with the silanol functional group obtained from the hydrolysis of phenyltrimethoxysilane to generate dihydroxyphenylsiloxy Ti-POSS;

[0018] Using toluene and deionized water as a mixed solvent, under the catalysis of dibutyltin dilaurate, 1 molar equivalent of dihydroxyphenylsiloxy Ti-POSS first undergoes a condensation reaction with the hydrolysis product of (0.9-0.99) molar equivalents of vinyldimethylethoxysilane, and then undergoes a condensation reaction with the hydrolysis product of (1.0-1.1) molar equivalents of (3-epoxypropoxypropyl)dimethylethoxysilane to generate siloxane@Ti-POSS type grafted monomer.

[0019] Preferably, the initiator is dicumyl peroxide or tert-butyl peroxide.

[0020] Preferably, the epoxy-based LLDPE masterbatch is prepared by melt extrusion granulation using a twin-screw extruder, with the temperatures of zones 1-4 being 105-115℃, 120-130℃, 130-140℃, and 130-140℃ respectively.

[0021] Preferably, the PA6-LLDPE film is prepared by blow molding the film using an extruder. The temperatures of the three zones of the extruder barrel are: 170-190℃ in the fixed conveying zone, 210-230℃ in the melting zone, 210-230℃ in the melt conveying zone, and 210-220℃ in the die head.

[0022] Preferably, the new energy battery packaging film is an aluminum-plastic film, the outer layer of which is a PA6-LLDPE film, and the formula of the PA6-LLDPE film is: (70-90)wt% PA6 resin and (10-30)wt% epoxy-based LLDPE masterbatch.

[0023] The formulation of the epoxy-based LLDPE masterbatch is: (79.85-89.95)wt% LLDPE resin, (0.05-0.15)wt% dicumyl peroxide and (10-20)wt% siloxane-type or siloxane@Ti-POSS-type grafted monomers.

[0024] Preferably, the thickness of the PA6-LLDPE film is 15-30 μm.

[0025] The beneficial effects of this invention are as follows:

[0026] Based on molecular design principles, siloxane-type graft monomers containing vinyl and epoxy groups and siloxane@Ti-POSS-type graft monomers were synthesized. The specific mechanism is as follows:

[0027] Mechanism 1: Based on the silanol condensation reaction mechanism, using diphenyldimethoxysilane as the bridging structure and vinyldimethylethoxysilane and (3-epoxypropoxypropyl)dimethylethoxysilane as functional group raw materials, siloxane-type grafted monomers are synthesized.

[0028] Mechanism 2: The hydrolysis product of phenyltrimethoxysilane undergoes a deisobutanol reaction with isobutoxyheptaphenyltitanium silsesquioxane (i.e., Ti-POSS) to generate dihydroxyphenylsiloxyTi-POSS; based on the silanol condensation reaction mechanism, using dihydroxyphenylsiloxyTi-POSS as the bridging structure and vinyldimethylethoxysilane and (3-epoxypropoxypropyl)dimethylethoxysilane as functional group raw materials, a siloxane@Ti-POSS type graft monomer is synthesized;

[0029] Under the action of a free radical initiator and in the molten state, a graft monomer containing vinyl groups is grafted onto the main chain of LLDPE resin through a free radical graft copolymerization reaction to obtain epoxy-siloxane type LLDPE masterbatch or siloxane@Ti-POSS type epoxy-siloxane LLDPE masterbatch.

[0030] Based on the epoxy-amine ring-opening mechanism, epoxy-siloxane type LLDPE masterbatch or siloxane@Ti-POSS type epoxy-siloxane LLDPE masterbatch is used as a compatibilizer and melt-blended with polyamide PA6, and PA6-LLDPE film is obtained by blow molding process.

[0031] Experimental results confirm that the PA6-LLDPE membrane product prepared by this invention maintains properties close to those of pure PA6 membrane in terms of fracture resistance and puncture resistance, while achieving significant improvements in impact resistance and water absorption.

[0032] PA6-LLDPE film products can replace the outer layer of pure PA6 film in aluminum-plastic film for packaging batteries with high drop risk and low burr during assembly, achieving the beneficial technical effect of reducing the overall production cost of aluminum-plastic film. Detailed Implementation

[0033] Experimental Example 1:

[0034] The synthesis mechanism of siloxane-type grafted monomers is as follows: based on the silanol condensation reaction mechanism, diphenyldimethoxysilane first reacts with vinyldimethylethoxysilane to introduce vinyl functional groups, and then reacts with (3-epoxypropoxypropyl)dimethylethoxysilane to introduce epoxy functional groups, thereby generating siloxane-type grafted monomers.

[0035] The experimental procedure for siloxane-type grafted monomers is as follows:

[0036] 2.50 g of diphenyldimethoxysilane was added to 30 mL of toluene and 5 mL of deionized water and hydrolyzed at 70 °C for 1.5 h. Then, 10 mg of dibutyltin dilaurate and 1.33 g of vinyldimethylethoxysilane were added and reacted at 70 °C for 1.5 h. Then, 2.23 g of (3-epoxypropoxypropyl)dimethylethoxysilane was added and reacted at 60 °C for 3 h. Toluene and small molecule byproducts were removed by rotary evaporation under reduced pressure to obtain a siloxane-type grafted monomer.

[0037] The chemical structural formula of the siloxane-type grafted monomer is:

[0038] ;

[0039] The proton NMR characterization results of the siloxane-type grafted monomers are as follows:

[0040] 1 H NMR (CDCl3, 400MHz) δ: 0.08 (s, 6H), 0.16 (s, 6H), 0.82-0.86 (t, 2H), 1.53-1.60 (m, 2H), 2.90-3.04 (m, 2H), 3.34-3.44 (m , 3H), 3.49-3.59(m, 2H), 5.74-5.86(m, 2H), 6.06-6.12(t, 1H), 7.23-7.26(m, 4H), 7.33-7.36(m, 2H), 7.45-7.47(m, 4H).

[0041] Experimental Example 2:

[0042] The synthesis process of siloxane@Ti-POSS type grafted monomers is as follows:

[0043] In the first step, the isobutoxy functional group in isobutoxyheptaphenyltitanium silsesquioxane (i.e., Ti-POSS) undergoes a deisobutanol reaction with the silanol functional group obtained from the hydrolysis of phenyltrimethoxysilane to generate dihydroxyphenylsiloxy Ti-POSS;

[0044] The second step involves reacting dihydroxyphenylsiloxy Ti-POSS with vinyldimethylethoxysilane to introduce vinyl functional groups, and then reacting with (3-epoxypropoxypropyl)dimethylethoxysilane to introduce epoxy functional groups, thereby generating siloxane@Ti-POSS type grafted monomers.

[0045] The experimental procedure for grafting siloxane@Ti-POSS type monomers is as follows:

[0046] Step 1: Add 0.38g of phenyltrimethoxysilane to 10mL of toluene and 2mL of deionized water, add 3 drops of glacial acetic acid, and stir at 60℃ for 1h to hydrolyze. Cool to room temperature, separate the organic phase and dry with anhydrous magnesium sulfate to obtain the dried hydrolysis product. Under dehydration and deoxygenation conditions and an ice bath, add the dried hydrolysis product dropwise to 30mL of anhydrous toluene solution containing 2g of isobutoxyheptaphenyltitanium silsesquioxane (Ti-POSS). After the addition is complete, continue stirring the reaction under an ice bath for 0.5h. Remove the ice bath, raise the temperature to 25℃ and react for 4h. Concentrate under reduced pressure by rotary evaporation, precipitate the solid with cold anhydrous acetonitrile while stirring, filter and wash the filter cake with anhydrous acetonitrile to obtain dihydroxyphenylsiloxy Ti-POSS.

[0047] The chemical structural formula of dihydroxyphenylsiloxy Ti-POSS is:

[0048] ;

[0049] The 1H NMR characterization results of dihydroxyphenylsiloxy Ti-POSS are as follows:

[0050] 1 H NMR (CDCl3, 400MHz) δ: 6.99 (s, 2H), 7.26-7.33 (m, 24H), 7.50-7.53 (m, 8H), 7.54-7.58 (m, 8H);

[0051] Step 2: Add 11.56g of dihydroxyphenylsiloxy Ti-POSS to 80mL of toluene and 5mL of deionized water, stir to dissolve for 10min, add 10mg of dibutyltin dilaurate and 1.33g of vinyldimethylethoxysilane, stir at 70℃ for 1.5h, then add 2.23g of (3-epoxypropoxypropyl)dimethylethoxysilane, stir at 60℃ for 3h, remove toluene and small molecule byproducts by rotary evaporation under reduced pressure to obtain siloxane@Ti-POSS type grafted monomer;

[0052] The chemical structural formula of the siloxane@Ti-POSS type grafted monomer is as follows:

[0053] ;

[0054] The proton NMR characterization results of the siloxane@Ti-POSS type grafted monomers are as follows:

[0055] 1H NMR (CDCl3, 400MHz) δ: 0.10 (s, 6H), 0.16 (s, 6H), 0.84-0.88 (t, 2H), 1.62-1.69 (m, 2H), 2.98-3.12 (m, 2H), 3.41-3.51 (m, 3H), 3.59-3.72(m, 2H), 5.89-5.99(m, 2H), 6.18-6.23(t, 1H), 7.26-7.33(m, 24H), 7.50-7.52(m, 8H), 7.55-7.57(m, 8H).

[0056] Experiment Example 3:

[0057] The epoxy-siloxane type LLDPE masterbatch has the following raw material formulation: 84.9 wt% linear low-density polyethylene LLDPE resin (its grade is DFDA-7042), 0.1 wt% dicumyl peroxide and 15 wt% siloxane type grafted monomer.

[0058] The preparation process of epoxy-siloxane type LLDPE masterbatch is as follows: linear low-density polyethylene LLDPE resin, dicumyl peroxide and siloxane type grafted monomer are added to a high-speed mixer, stirred and mixed, and then poured into a twin-screw extruder for melt extrusion granulation to obtain epoxy-siloxane type LLDPE masterbatch.

[0059] The process parameters for the twin-screw extruder are as follows: screw speed is 40 r / min, and temperatures in zones 1-4 are 110℃, 125℃, 135℃, and 135℃, respectively.

[0060] Experiment Example 4:

[0061] The epoxy-based siloxane@Ti-POSS type LLDPE masterbatch has the following raw material formulation: 84.9 wt% linear low-density polyethylene LLDPE resin (its grade is DFDA-7042), 0.1 wt% dicumyl peroxide and 15 wt% siloxane@Ti-POSS type grafted monomer.

[0062] The only difference between the preparation process of epoxy-siloxane@Ti-POSS type LLDPE masterbatch and that of epoxy-siloxane type LLDPE masterbatch is that the siloxane@Ti-POSS type grafted monomer is used instead of the siloxane type grafted monomer. Example 1:

[0063] PA6-LLDPE film I-1, its raw material formula is: 90wt% polyamide 6 (PA6) resin and 10wt% epoxy siloxane type LLDPE masterbatch;

[0064] The preparation process of PA6-LLDPE film I-1 is as follows: polyamide 6 (PA6) resin (brand name CM1046) is placed in a vacuum drying oven at 80℃ and dried for 24h to obtain dried polyamide 6 (PA6) resin.

[0065] Polyamide 6 (PA6) resin and epoxy siloxane type LLDPE masterbatch were added to a high-speed mixer, mixed at low speed for 5 min, and then mixed at high speed for 5 min. After that, the mixture was added to an extruder for blow molding to obtain a PA6-LLDPE film I-1 with a thickness of 25 μm.

[0066] The extruder's process parameters are as follows: the barrel temperature in the three zones is 180℃ for the fixed conveying zone, 220℃ for the melting zone, 220℃ for the melt conveying zone, 215℃ for the die head, and 20r / min for the screw speed. Example 2:

[0067] PA6-LLDPE film I-2, its raw material formula is: 75wt% polyamide 6 (PA6) resin and 25wt% epoxy siloxane type LLDPE masterbatch;

[0068] The only difference between the preparation process of PA6-LLDPE membrane I-2 and that of PA6-LLDPE membrane I-1 is that the raw material formulation of PA6-LLDPE membrane I-2 is used instead of that of PA6-LLDPE membrane I-1. Example 3:

[0069] PA6-LLDPE film I-3, its raw material formula is: 70wt% polyamide 6 (PA6) resin and 30wt% epoxy siloxane type LLDPE masterbatch;

[0070] The only difference between the preparation process of PA6-LLDPE membrane I-3 and PA6-LLDPE membrane I-1 is that the raw material formula of PA6-LLDPE membrane I-3 is used instead of the raw material formula of PA6-LLDPE membrane I-1. Example 4:

[0071] PA6-LLDPE film II-1, its raw material formula is: 90wt% polyamide 6 (PA6) resin and 10wt% epoxy siloxane@Ti-POSS type LLDPE masterbatch;

[0072] The only difference between the preparation process of PA6-LLDPE membrane II-1 and PA6-LLDPE membrane I-1 is that the raw material formulation of PA6-LLDPE membrane II-1 is used instead of that of PA6-LLDPE membrane I-1. Example 5:

[0073] PA6-LLDPE film II-2, its raw material formula is: 75wt% polyamide 6 (PA6) resin and 25wt% epoxy siloxane@Ti-POSS type LLDPE masterbatch;

[0074] The only difference between the preparation process of PA6-LLDPE membrane II-2 and PA6-LLDPE membrane I-1 is that the raw material formulation of PA6-LLDPE membrane II-2 is used instead of that of PA6-LLDPE membrane I-1. Example 6:

[0075] PA6-LLDPE film II-3, its raw material formula is: 70wt% polyamide 6 (PA6) resin and 30wt% epoxy siloxane@Ti-POSS type LLDPE masterbatch;

[0076] The only difference between the preparation process of PA6-LLDPE membrane II-3 and PA6-LLDPE membrane I-1 is that the raw material formula of PA6-LLDPE membrane II-3 is used instead of the raw material formula of PA6-LLDPE membrane I-1.

[0077] Comparative Example 1:

[0078] PA6 film, its raw material formula is: 100wt% polyamide 6 (PA6) resin;

[0079] The only difference between the preparation process of PA6 membrane and that of PA6-LLDPE membrane I-1 is that the raw material formulation of PA6 membrane is used instead of that of PA6-LLDPE membrane I-1.

[0080] Performance testing:

[0081] I. Tensile Strength: According to GB / T 1040.3-2006 "Determination of Tensile Properties of Plastics - Part 3: Test Conditions for Films and Sheets", a universal testing machine was used for tensile testing. The sample film was cut into strips with a length of 150 mm and a width of 20 mm, with a clamping distance of 50 mm and a testing speed of 150 mm / min.

[0082] II. Puncture strength: According to GB / T 37841-2019 "Test method for puncture resistance of plastic films and sheets", a sample film with a diameter of 100mm×100mm was loaded onto a tensile testing machine. The thickness of each sample film was measured at 4 points around its perimeter and the arithmetic mean was calculated. Five samples were tested in each group, and the test was carried out at a puncture rate of 100mm / min.

[0083] III. Impact Strength: According to GB / T 1843-2008 "Determination of Impact Strength of Plastic Cantilever Beams", the notch type is Type A, the pendulum impact energy is 5.5J, and three parallel tests are conducted, with the average value taken.

[0084] IV. Water Absorption Rate: According to GB / T 1034-2008 "Determination of Water Absorption of Plastics", a sample film cut into 60mm×60mm pieces was placed in an oven and dried at 80℃ for 24 hours. The sample was then weighed and recorded as m1 (g). After that, the sample was soaked in distilled water at room temperature for 48 hours. The sample was then removed, the surface moisture was blotted with filter paper, and the sample was weighed and recorded as m2 (g). The water absorption rate was calculated as (m2-m1) / m1×100%.

[0085] The test results are shown in Table 1 below;

[0086] Table 1 Performance test results of PA6-LLDPE membrane

[0087]

[0088] The experimental results above show that:

[0089] When the content of siloxane-type LLDPE masterbatch or siloxane@Ti-POSS type LLDPE masterbatch is reduced to 10wt%, the fracture resistance and puncture resistance of PA6-LLDPE film products are close to those of pure PA6 film products.

[0090] When the content of siloxane-type LLDPE masterbatch or siloxane@Ti-POSS type LLDPE masterbatch is increased to 30wt%, the fracture resistance and puncture resistance of PA6-LLDPE film products show a significant downward trend compared with pure PA6 film products.

[0091] Both siloxane-type LLDPE masterbatch and siloxane@Ti-POSS type LLDPE masterbatch can significantly improve the impact resistance and water absorption of PA6-LLDPE film products.

[0092] Increasing the content of siloxane-type LLDPE masterbatch or siloxane@Ti-POSS type LLDPE masterbatch has a significant effect on improving the impact resistance and water absorption properties of PA6-LLDPE film products.

[0093] Compared to siloxane-based LLDPE masterbatch, siloxane@Ti-POSS type LLDPE masterbatch not only significantly improves the impact resistance and water absorption of PA6-LLDPE film products, but also noticeably improves their tear resistance and puncture resistance.

Claims

1. A method for preparing a new energy battery packaging film, characterized in that, Includes the following steps: Step 1: Based on the siloxane condensation reaction mechanism, using diphenyldimethoxysilane or dihydroxyphenylsiloxy Ti-POSS as the bridging structure, and providing functional group raw materials from vinyldimethylethoxysilane and (3-epoxypropoxypropyl)dimethylethoxysilane, siloxane-type graft monomers containing vinyl and epoxy groups or siloxane@Ti-POSS-type graft monomers are synthesized. Step 2: Under the action of a molten state and a free radical initiator, the grafting monomer is grafted onto the molecular backbone of LLDPE resin through a free radical graft copolymerization reaction to obtain epoxy-based LLDPE masterbatch. Step 3: Based on the epoxy-amine ring-opening reaction mechanism, epoxy-based LLDPE masterbatch and PA6 resin are melt-blended to generate a bridged PA6-LLDPE composite masterbatch. The composite masterbatch is then blow-molded to produce a PA6-LLDPE film. Step 4: Replace the outer layer of PA6 film in the aluminum-plastic film with PA6-LLDPE film to obtain a new energy battery packaging film.

2. The method for preparing a new energy battery packaging film according to claim 1, characterized in that, The preparation method of the siloxane-type grafted monomer is as follows: Using toluene and deionized water as a mixed solvent, diphenyldimethoxysilane is first hydrolyzed, and then undergoes a condensation reaction with the hydrolysis product of vinyldimethylethoxysilane under the catalysis of dibutyltin dilaurate. Subsequently, it undergoes a condensation reaction with the hydrolysis product of (3-epoxypropoxypropyl)dimethylethoxysilane. The molar ratio of diphenyldimethoxysilane, vinyldimethylethoxysilane and (3-epoxypropoxypropyl)dimethylethoxysilane is controlled to be 1:(0.9-0.99):(1.0-1.1) to prepare a siloxane-type grafted monomer.

3. The method for preparing a new energy battery packaging film according to claim 1, characterized in that, The preparation method of the siloxane@Ti-POSS type grafted monomer is as follows: The isobutoxy functional group in isobutoxyheptaphenyltitanium silsesquioxane Ti-POSS undergoes a deisobutanol reaction with the silanol functional group obtained from the hydrolysis of phenyltrimethoxysilane to generate dihydroxyphenylsiloxy Ti-POSS; Using toluene and deionized water as a mixed solvent, under the catalysis of dibutyltin dilaurate, 1 molar equivalent of dihydroxyphenylsiloxy Ti-POSS first undergoes a condensation reaction with the hydrolysis product of (0.9-0.99) molar equivalents of vinyldimethylethoxysilane, and then undergoes a condensation reaction with the hydrolysis product of (1.0-1.1) molar equivalents of (3-epoxypropoxypropyl)dimethylethoxysilane to generate siloxane@Ti-POSS type grafted monomer.

4. The method for preparing a new energy battery packaging film according to claim 1, characterized in that, The initiator is dicumyl peroxide or tert-butyl peroxide.

5. The method for preparing a new energy battery packaging film according to claim 1, characterized in that, The preparation method of the epoxy-based LLDPE masterbatch is as follows: melt extrusion granulation is carried out by a twin-screw extruder, and the temperatures of zones 1-4 are 105-115℃, 120-130℃, 130-140℃, and 130-140℃ respectively.

6. The method for preparing a new energy battery packaging film according to claim 1, characterized in that, The PA6-LLDPE film is prepared by blow molding the film using an extruder. The temperatures of the three zones of the extruder barrel are: 170-190℃ in the fixed conveying zone, 210-230℃ in the melting zone, 210-230℃ in the melt conveying zone, and 210-220℃ in the die head.

7. A new energy battery packaging film prepared by the method according to any one of claims 1-6, characterized in that, The new energy battery packaging film is an aluminum-plastic film, and the outer layer of the aluminum-plastic film is a PA6-LLDPE film. The formula of the PA6-LLDPE film is: (70-90)wt% PA6 resin and (10-30)wt% epoxy-based LLDPE masterbatch. The formulation of the epoxy-based LLDPE masterbatch is: (79.85-89.95)wt% LLDPE resin, (0.05-0.15)wt% dicumyl peroxide and (10-20)wt% siloxane-type or siloxane@Ti-POSS-type grafted monomers.

8. A new energy battery packaging film according to claim 7, characterized in that, The chemical structural formula of the siloxane-type grafted monomer is: 。 9. A new energy battery packaging film according to claim 7, characterized in that, The chemical structural formula of the siloxane@Ti-POSS type grafted monomer is as follows: 。 10. A new energy battery packaging film according to claim 7, characterized in that, The thickness of the PA6-LLDPE film is 15-30 μm.

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