Aluminum-plastic film processing technology based on modified polypropylene glue

Abstract

The embodiment of the present invention provides an aluminum-plastic film processing technology based on modified polypropylene glue, which includes obtaining a first film layer including a passivated aluminum foil layer, a nylon adhesive layer coated on one side of the passivated aluminum foil layer, and a nylon film bonded on the nylon adhesive layer and sequentially heated and matured; coating the other side of the passivated aluminum foil layer with modified polypropylene glue and bonding a modified polypropylene film on the surface of the modified polypropylene glue layer to form a second film layer; the modified polypropylene is less mixed with a modified polypropylene emulsion and an organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 65-95%. The above-mentioned aluminum-plastic film processing technology based on modified polypropylene glue can improve the sealing strength and puncture strength of the aluminum-plastic film by preparing a modified polypropylene emulsion, and coating the modified polypropylene glue obtained based on the modified polypropylene emulsion and then bonding the modified polypropylene film, thereby greatly improving the reliability of the aluminum-plastic film in lithium battery products.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum-plastic film processing and manufacturing, in particular to an aluminum-plastic film processing technology based on modified polypropylene glue. Background Art

[0002] Biaxially oriented polymer film is widely used as a flexible packaging material. It has the excellent properties of high tensile strength and high barrier properties. It also has excellent puncture resistance and chemical solvent resistance. It can be used in the production process of many products such as electronic and electrical packaging, pharmaceutical packaging, and food packaging.

[0003] The outer layer of the rechargeable battery can be packaged with a flexible packaging material. However, the existing flexible packaging materials have insufficient tensile strength during use, which makes them easy to be punctured. Once the flexible packaging material on the outer layer of the rechargeable battery is punctured, it is very easy to cause the rechargeable battery to catch fire, thereby affecting the safety of the rechargeable battery. Therefore, the flexible material used for packaging in the prior art method has the problem of insufficient puncture resistance. Summary of the invention

[0004] The embodiment of the present invention provides an aluminum-plastic film processing technology based on modified polypropylene glue, aiming to solve the problem of insufficient puncture resistance of flexible materials used for packaging in the prior art methods.

[0005] The embodiment of the present invention provides an aluminum-plastic film processing technology based on modified polypropylene glue, which includes the following steps:

[0006] Obtaining a first film layer including a passivated aluminum foil layer, a nylon adhesive layer coated on one side of the passivated aluminum foil layer, and a nylon film laminated on the nylon adhesive layer and then heated and aged in sequence;

[0007] The modified polypropylene glue is coated on the other side of the passivated aluminum foil layer and a modified polypropylene film is attached to the surface of the modified polypropylene glue layer to form a second film layer; the modified polypropylene glue includes a modified polypropylene emulsion and an organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 65-95%;

[0008] The preparation method of the modified polypropylene emulsion comprises: mixing 16%-35% castor oil and 65%-84% propylene by mass fraction, performing reflux condensation reaction at 60-90° C. for 1.5-4 hours, adding an active agent, and stirring during the reaction;

[0009] Adding DMPA and a chain extender to the mixed solution after the above reaction to further carry out a chain extension reaction;

[0010] Add epoxy resin and TMP to the reaction solution, and heat it in a water bath to 55-65°C for 2.4-5 hours;

[0011] After the reaction solution reaches room temperature, add triethylamine in an amount of 20-45% of the reaction solution volume, add deionized water, and perform high-speed centrifugation at 8500-12500 rpm for 3-5 minutes;

[0012] Ethylene diamine is added to the solution after centrifugation to react and obtain the modified polypropylene emulsion.

[0013] Preferably, the organic solvent is composed of 35-60% butanone and 40-65% cyclohexane by mass percentage.

[0014] Preferably, the activator is IPDI, and the added mass of the activator is 2.5-5% of the mass of the reflux condensation reaction solution.

[0015] Preferably, the added mass of the active agent is 2.5-5% of the mass of the reflux condensation reaction solution; the active agent is composed of 75-95% IPDI and 5-25% DBTDL in mass percentage.

[0016] Preferably, after adding the DMPA and the chain extender, the mixed solution is subjected to a chain extension reaction at 75-100° C. for 1.5-2.5 hours.

[0017] Preferably, the amount of ethylenediamine added is 15-35% of the volume of the solution after centrifugation.

[0018] Preferably, the ratio of the added amount of the epoxy resin to the added propylene is 1:(6-9).

[0019] Preferably, the added mass of the TMP is 25-40% of the added mass of the epoxy resin.

[0020] Preferably, the surface layer of the second film layer is also covered with a lubricant layer; the lubricant layer is composed of 25-80% erucamide and 20-75% ethanol in mass percentage.

[0021] Preferably, the nylon adhesive layer is composed of 20-40% polyurethane resin, 12-50% isocyanate, and 15-30% ethyl acetate in mass percentage.

[0022] The embodiment of the present invention provides an aluminum-plastic film processing technology based on modified polypropylene glue, which includes obtaining a first film layer including a passivated aluminum foil layer, a nylon glue layer coated on one side of the passivated aluminum foil layer, and a nylon film bonded on the nylon glue layer and subjected to sequential heating and maturation; coating the other side of the passivated aluminum foil layer with modified polypropylene glue and bonding a modified polypropylene film on the surface of the modified polypropylene glue layer to form a second film layer; the modified polypropylene is less mixed with a modified polypropylene emulsion and an organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 65-95%. The above-mentioned aluminum-plastic film processing technology based on modified polypropylene glue can improve the sealing strength and puncture strength of the aluminum-plastic film by preparing a modified polypropylene emulsion, and coating the modified polypropylene glue obtained based on the modified polypropylene emulsion and then bonding the modified polypropylene film, thereby greatly improving the reliability of the aluminum-plastic film in lithium battery products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0024] Figure 1 A flow chart of a method for processing aluminum-plastic film based on modified polypropylene glue provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the cross-sectional structure of an aluminum-plastic film provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Introduction of raw materials and equipment in the examples:

[0028] Castor oil, purchased from Shanghai Yuanye Biotechnology Co., Ltd., model number 8001-79-4;

[0029] Propylene, purchased from Haiwei Petrochemical Co., Ltd., model number 115-07-1;

[0030] DMPA (2,2-dihydroxymethylpropionic acid) was purchased from Hebei Zhentian Food Additive Co., Ltd., model number 4767-03-7;

[0031] Aluminum foil, produced in-house, 0.045 mm thick;

[0032] Chain extender, purchased from Shandong AVIC Technology Service Co., Ltd., model DETDA;

[0033] Epoxy resin, purchased from Hebei Zhentian Food Additive Co., Ltd., model number 61788-97-4;

[0034] TMP (trimethylolpropane), purchased from Shanghai Yuanye Biotechnology Co., Ltd., model number 77-99-6;

[0035] Triethylamine, purchased from Henan Tianfu Chemical Co., Ltd., model number 121-44-8;

[0036] Ethylenediamine, purchased from Shanghai Dingmiao Chemical Technology Co., Ltd., model number 6780-13-8;

[0037] Butanone, purchased from Sinopharm Chemical Reagent Co., Ltd., model number 78-93-3;

[0038] IPDI (isophorone diisocyanate), purchased from Shanghai Biyang Industrial Co., Ltd., model number 4098-71-9;

[0039] DBTDL (dibutyltin dilaurate), purchased from Shanghai Biyang Industrial Co., Ltd., model number 77-58-7;

[0040] Erucic acid amide, purchased from Shanghai Huayi Chemical Additives Co., Ltd., model 98%-20kg;

[0041] Ethanol, purchased from Changzhou Qidi Chemical Co., Ltd., model 64-17-5;

[0042] Polyurethane resin, purchased from Qingdao Ocean New Material Technology Co., Ltd., model number AMMT-045;

[0043] Isocyanate, purchased from Hebei Zhentian Food Additive Co., Ltd., model number 75-13-8;

[0044] Ethyl acetate, purchased from Hebei Guanlang Biotechnology Co., Ltd., model number 141-78-6;

[0045] Cyclohexane, purchased from Shanghai Kaisai Chemical Co., Ltd., model number 110-82-7;

[0046] Phosphorus, purchased from Shanghai Jinjinle Industrial Co., Ltd., model number 7723-14-0;

[0047] Passivation solution, purchased from Dongguan Biliang Cleaning Technology Co., Ltd., model SG-612;

[0048] The oven was purchased from Rongzheng Yida Electronic Technology Co., Ltd., model RZYD-GZ-01;

[0049] Condensation reflux reactor, purchased from Guangdong Hanhong Industrial Group Co., Ltd., model HH-5412;

[0050] Water bath, purchased from Jiaxing Zhongxin Medical Instrument Co., Ltd., model DKS;

[0051] Centrifuge, purchased from Hunan Kaida Scientific Instrument Co., Ltd., model KH20R;

[0052] The puncture tester was purchased from Shenzhen Lai Te Instrument Equipment Co., Ltd., model number is LT-CH20A.

[0053] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0054] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0055] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0056] See also Figure 1 , Figure 1 A method flow chart of an aluminum-plastic film processing technology based on modified polypropylene glue provided in an embodiment of the present invention. The aluminum-plastic film processing technology based on modified polypropylene glue is used to process and obtain the second film layer of the aluminum-plastic film in the above embodiment. As shown in the figure, the aluminum-plastic film processing technology based on modified polypropylene glue includes steps S110 to S120.

[0057] S110, obtaining a first film layer including a passivated aluminum foil layer, a nylon adhesive layer coated on one side of the passivated aluminum foil layer, and a nylon film laminated on the nylon adhesive layer and subjected to sequential heating and curing.

[0058] S120, coating the other side of the passivated aluminum foil layer with modified polypropylene glue and laminating a modified polypropylene film on the surface of the modified polypropylene glue layer to form a second film layer.

[0059] The obtained aluminum-plastic film consists of a three-layer structure of a first film layer 1, a core layer 2 and a second film layer 3. The first film layer 1 includes a nylon adhesive layer 12 and a nylon film layer 11 attached to the surface of the nylon adhesive layer 12; the second film layer 3 includes a modified polypropylene glue layer 31 and a modified polypropylene polymer film layer 32 attached to the surface of the modified polypropylene glue layer 31.

[0060] Specifically, the modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 65-95%, and in the best embodiment, the volume fraction of the modified polypropylene emulsion is 78%. The organic solvent is composed of 35-60% butanone and 40-65% cyclohexane by mass percentage; in the best embodiment, the organic solvent includes 40% butanone and 60% cyclohexane.

[0061] The preparation method of the modified polypropylene emulsion includes: mixing 16%-35% castor oil and 65%-84% propylene by mass fraction, performing reflux condensation reaction at 60-90°C for 1.5-4 hours and adding an active agent, stirring while reacting, for example, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent. DMPA and a chain extender are added to the mixed solution after the above reaction to further perform a chain extension reaction. Specifically, after adding the DMPA and the chain extender, the mixed solution is subjected to a chain extension reaction at 75-100°C for 1.5-2.5 hours. In a specific embodiment, the amount of DMPA added is 2% of the volume of the mixed solution after the reaction, and the amount of the chain extender added is 4% of the volume of the mixed solution after the reaction. In the optimal embodiment, the mixed solution can be placed at 85°C for a chain extension reaction for 2 hours.

[0062] Add epoxy resin and TMP to the reaction solution, and keep it in a water bath at 55-65°C for 2.4-5 hours; add 20-45% of the volume of triethylamine to the reaction solution after the reaction solution reaches room temperature, add deionized water and perform high-speed centrifugation at 8500-12500 rpm for 3-5 minutes; add ethylenediamine to the solution after centrifugation, and react to obtain the modified polypropylene emulsion. Specifically, the volume of triethylamine added accounts for 40% of the volume of the reaction solution, the optimal speed of centrifugation is 12000 rpm, and the centrifugation time is 5 minutes.

[0063] Among them, the modified polypropylene emulsion exists in the form of polypropylene colloid, the melt flow rate of the polypropylene colloid is 4.68, the acid value is 1.49, the melting point of the polypropylene colloid is 164~175℃, and the glass transition temperature is 135℃.

[0064] In a more preferred embodiment, the mass fractions of castor oil and propylene are 25% and 75% respectively. The ratio of the amount of epoxy resin added to the amount of propylene added is 1:8. The added mass of TMP is 35% of the added mass of epoxy resin. The epoxy resin is used as a curing agent in the modified polypropylene glue layer.

[0065] In a specific embodiment, IPDI can be selected as the activator, and the added mass of the activator is 2.5-5 of the mass of the reflux condensation reaction solution. In the optimal implementation method, the added mass of the activator is 4.5% of the mass of the reaction solution.

[0066] In another specific embodiment, the activator can be a combination of IPDI and DBTDL, wherein the activator is composed of 75-95% IPDI and 5-25% DBTDL by mass percentage; in the optimal implementation manner, the added mass of the activator is 4.5% of the mass of the reaction solution, and the proportion of DBTDL in the activator is 12%.

[0067] In a specific embodiment, the amount of ethylenediamine added is 15-35% of the volume of the solution after centrifugation. In a specific application process, 20% of ethylenediamine by volume can be added to the solution after centrifugation.

[0068] In a specific embodiment, before the modified polypropylene film is attached to the surface layer of the modified polypropylene glue layer, the method further includes: heating and melting the modified polypropylene particles and then cooling them to obtain the modified polypropylene film, and the heating temperature for heating and melting is 180-230°C. Specifically, the heating temperature for heating and aging is 50-70°C. The modified polypropylene particles can be heated, melted, and then cooled to obtain a modified polypropylene film, wherein the modified polypropylene can be modified by adding a modifier to the polypropylene. In the specific embodiment of the present application, ethylene propylene diene monomer resin is used as a modifier, and modified polypropylene particles containing polypropylene and ethylene propylene diene monomer resin are prepared by a dynamic phosphating method. Among them, the temperature for heating the modified polypropylene particles is 180-230°C, and the temperature for heating and aging can be 50-70°C.

[0069] See also Figure 2 , Figure 2It is a schematic diagram of the cross-sectional structure of the aluminum-plastic film provided by an embodiment of the present invention. The structure of the aluminum-plastic film prepared by the above process is shown in the figure, and the aluminum-plastic film comprises a first film layer 1, a core layer 2 and a second film layer 3 which are stacked in sequence; the first film layer 1 comprises a nylon adhesive layer 12 attached to the surface of the core layer 2 and a nylon film layer 11 attached to the surface of the nylon adhesive layer 12; the core layer 2 is a passivated aluminum foil layer; the second film layer 3 comprises a modified polypropylene glue layer 31 attached to the surface of the core layer 2 and a modified polypropylene polymer film layer 32 attached to the surface of the modified polypropylene glue layer 31. Among them, the modified polypropylene polymer film layer 32 can be a three-layer structure, each layer structure is composed of a modified polypropylene polymer film, and the ratio of the thickness of each layer in the three-layer structure is 1:8:1.

[0070] In a more specific embodiment, the surface of the second film layer 3 is also covered with a lubricant layer 4; the lubricant layer is composed of 25-80% erucamide and 20-75% ethanol by mass. Specifically, the nylon adhesive layer is composed of 20-40% polyurethane resin, 12-50% isocyanate, and 15-30% ethyl acetate by mass.

[0071] The specific implementation process and beneficial effects of the solution are described below by comparing multiple embodiments.

[0072] Example 1

[0073] An aluminum-plastic film, wherein the processing technology is:

[0074] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0075] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0076] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 70%.

[0077] Among them, the preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring while reacting; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 85°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm to 60°C in a water bath for 4 hours; adding triethylamine of 40% of the volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4.5% of the mass of the reflux condensation reaction solution; the active agent is composed of 88% IPDI and 12% DBTDL by mass percentage. Wherein, the added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0078] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0079] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0080] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0081] Example 2

[0082] An aluminum-plastic film, wherein the processing technology is:

[0083] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0084] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0085] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 70%.

[0086] The preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring while reacting; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 85°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm at 60°C in a water bath for 4 hours; adding 40% triethylamine by volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4.5% of the mass of the reflux condensation reaction solution; the active agent is 88% IPDI. The added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0087] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0088] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0089] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0090] Example 3

[0091] An aluminum-plastic film, wherein the processing technology is:

[0092] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0093] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0094] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 85%.

[0095] Among them, the preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring while reacting; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 85°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm to 60°C in a water bath for 4 hours; adding triethylamine of 40% of the volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4.5% of the mass of the reflux condensation reaction solution; the active agent is composed of 88% IPDI and 12% DBTDL by mass percentage. Wherein, the added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0096] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0097] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0098] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0099] Example 4

[0100] An aluminum-plastic film, wherein the processing technology is:

[0101] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0102] A nylon film is laminated on the surface of the nylon adhesive layer and heated and cured to form the first film layer, wherein the heating temperature for heating and curing is 70° C. and the heating time is 4 hours.

[0103] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 85%.

[0104] The preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring while reacting; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 85°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm at 60°C in a water bath for 4 hours; adding 40% triethylamine by volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4.5% of the mass of the reflux condensation reaction solution; the active agent is 88% IPDI. The added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0105] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0106] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0107] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0108] Example 5

[0109] An aluminum-plastic film, wherein the processing technology is:

[0110] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0111] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0112] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 78%.

[0113] Among them, the preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring while reacting; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 85°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm to 60°C in a water bath for 4 hours; adding triethylamine of 40% of the volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4.5% of the mass of the reflux condensation reaction solution; the active agent is composed of 88% IPDI and 12% DBTDL by mass percentage. Wherein, the added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0114] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0115] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0116] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0117] Example 6

[0118] An aluminum-plastic film, wherein the processing technology is:

[0119] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0120] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0121] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 78%.

[0122] The preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring during the reaction; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 85°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm to 60°C in a water bath for 4 hours; adding 40% triethylamine by volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4.5% of the mass of the reflux condensation reaction solution; the active agent is IPDI. The added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0123] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0124] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0125] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0126] Example 7

[0127] An aluminum-plastic film, wherein the processing technology is:

[0128] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0129] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0130] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 78%.

[0131] Among them, the preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring while reacting; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 80°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm to 65°C in a water bath for 3 hours; adding triethylamine of 40% of the volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4% of the mass of the reflux condensation reaction solution; the active agent is composed of 88% IPDI and 12% DBTDL by mass percentage. Wherein, the added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0132] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0133] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0134] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0135] Example 8

[0136] An aluminum-plastic film, wherein the processing technology is:

[0137] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0138] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0139] The other side of the passivated aluminum foil layer after heating and aging is coated with modified polypropylene glue and then dried to form the modified polypropylene glue layer. The modified polypropylene glue includes modified polypropylene emulsion and organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 78%.

[0140] The preparation method of the modified polypropylene emulsion includes: mixing 25% castor oil and 75% propylene by mass fraction, performing reflux condensation reaction at 70°C for 2.5 hours and adding an active agent, stirring while reacting; adding DMPA and a chain extender to the mixed solution after the above reaction, and further performing a chain extension reaction at 80°C for 2 hours; adding epoxy resin and TMP to the reaction solution, and keeping it warm to 65°C in a water bath for 3 hours; adding 40% triethylamine by volume of the reaction solution after the reaction solution reaches room temperature, adding deionized water and performing high-speed centrifugation at 12000 rpm for 5 minutes; adding ethylenediamine to the solution after centrifugation, and reacting to obtain the modified polypropylene emulsion. Specifically, the organic solvent is composed of 40% butanone and 60% cyclohexane by mass percentage. Specifically, the added mass of the active agent is 4% of the mass of the reflux condensation reaction solution; the active agent is IPDI. The added amount of ethylenediamine is 20% of the volume of the solution after centrifugation.

[0141] A modified polypropylene film is laminated on the surface of the modified polypropylene glue layer to form the second film layer.

[0142] The modified polypropylene particles are heated and melted and then cooled to obtain the modified polypropylene film, wherein the heating temperature of the heating and melting is 210°C.

[0143] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0144] Comparative Example 1

[0145] An aluminum-plastic film, wherein the processing technology is:

[0146] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0147] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0148] The other side of the passivated aluminum foil layer after heating and aging is coated with polypropylene glue and then dried to form the polypropylene glue layer. The polypropylene glue layer includes polypropylene particles and a mixed solution, wherein the mass fraction of the polypropylene particles is 75%; the mixed solution is composed of 45% butanone and 55% cyclohexane by mass percentage. A curing agent is also added to the polypropylene glue layer, and the mass fraction of the curing agent in the polypropylene glue layer is 1.5%, and the curing agent is an epoxy resin.

[0149] A polypropylene film is laminated on the surface of the polypropylene glue layer to form the second film layer.

[0150] The polypropylene particles are heated and melted and then cooled to obtain the polypropylene film, and the heating temperature of the heating and melting is 210°C.

[0151] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0152] Comparative Example 2

[0153] An aluminum-plastic film, wherein the processing technology is:

[0154] The nylon adhesive solution is coated on one side of the passivated aluminum foil layer and then dried to form the nylon adhesive layer, wherein the nylon adhesive layer is composed of 25% polyurethane resin, 45% isocyanate, and 30% ethyl acetate in terms of mass percentage.

[0155] A nylon film is attached to the surface of the nylon adhesive layer and heated to form the first film layer, wherein the heating temperature of the heating and aging is 65° C. and the heating time is 3.5 hours.

[0156] The other side of the passivated aluminum foil layer after heating and aging is coated with polypropylene glue and then dried to form the polypropylene glue layer. The polypropylene glue layer includes polypropylene particles and a mixed solution, wherein the mass fraction of the polypropylene particles is 75%; the mixed solution is composed of 45% butanone and 55% cyclohexane by mass percentage. A curing agent is also added to the polypropylene glue layer, and the mass fraction of the curing agent in the polypropylene glue layer is 1.5%, and the curing agent is an epoxy resin.

[0157] A polypropylene film is laminated on the surface of the polypropylene glue layer to form the second film layer.

[0158] The polypropylene particles are heated and melted and then cooled to obtain the polypropylene film, and the heating temperature of the heating and melting is 210°C.

[0159] The lubricant is coated on the surface of the second film layer and then dried to form a lubricant layer, wherein the lubricant layer is composed of 65% erucamide and 35% ethanol by mass percentage.

[0160] Test Example 1

[0161] Aluminum-plastic film puncture test: The aluminum-plastic films obtained in Examples 1-8 of the present invention and Comparative Examples 1-2 were subjected to puncture tests. A 20 cm long and 0.375 mm cross-sectional area aluminum-plastic film was cut from each example and comparative example. 2 The aluminum-plastic film has a puncture test with a cross-sectional area of ​​0.1 cm 2The puncture needle was used to puncture the film, and the force value of the puncture needle and the deformation value of the aluminum-plastic film were measured. The results are shown in Table 1.

[0162] Table 1

[0163]

[0164] The puncture force of the aluminum-plastic film processed by the technical method in the embodiment of the present application is above 25.4N, and the maximum puncture force is 25.94N. In the actual application process, it has a strong puncture strength; compared with the aluminum-plastic film in comparative example 1 and comparative example 2, the aluminum-plastic film manufactured by the modified polypropylene glue coating process in the technical method of the present application has a significantly greater puncture force. Therefore, the aluminum-plastic film processed by the technical method of the present application has a very good sealing strength in the actual application process.

[0165] The aluminum-plastic film processing technology based on modified polypropylene glue provided in the embodiment of the present invention includes obtaining a first film layer including a passivated aluminum foil layer, a nylon adhesive layer coated on one side of the passivated aluminum foil layer, and a nylon film bonded on the nylon adhesive layer, and then heated and matured in sequence; coating modified polypropylene glue on the other side of the passivated aluminum foil layer and bonding a modified polypropylene film on the surface of the modified polypropylene glue layer to form a second film layer; the modified polypropylene is less mixed with a modified polypropylene emulsion and an organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 65-95%. The above-mentioned aluminum-plastic film processing technology based on modified polypropylene glue can improve the sealing strength and puncture strength of the aluminum-plastic film by preparing a modified polypropylene emulsion, and coating the modified polypropylene glue obtained based on the modified polypropylene emulsion and then bonding the modified polypropylene film, thereby greatly improving the reliability of the aluminum-plastic film in lithium battery products.

[0166] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A process for processing aluminum-plastic film based on modified polypropylene glue, characterized in that: The following steps are involved: Obtaining a first film layer including a passivated aluminum foil layer, a nylon adhesive layer coated on one side of the passivated aluminum foil layer, and a nylon film laminated on the nylon adhesive layer and then heated and aged in sequence; Coating modified polypropylene glue on the other side of the passivated aluminum foil layer and laminating a modified polypropylene film on the surface of the modified polypropylene glue layer to form a second film layer; the modified polypropylene glue includes modified polypropylene emulsion and an organic solvent, wherein the volume fraction of the modified polypropylene emulsion is 65-95%; The preparation method of the modified polypropylene emulsion comprises: mixing 16%-35% castor oil and 65%-84% propylene by mass fraction, performing reflux condensation reaction at 60-90° C. for 1.5-4 hours, adding an active agent, and stirring while reacting; Adding DMPA and a chain extender to the mixed solution after the reaction to further carry out a chain extension reaction; the amount of DMPA added is 2% of the volume of the mixed solution after the reaction; Add epoxy resin and TMP to the reaction solution, and heat it in a water bath to 55-65°C for 2.4-5 hours; After the reaction solution reaches room temperature, add triethylamine in an amount of 20-45% of the reaction solution volume, add deionized water, and centrifuge at 8500-12500 rpm for 3-5 minutes; Ethylene diamine is added to the solution after centrifugation to react and obtain the modified polypropylene emulsion.

2. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1, characterized in that: The organic solvent consists of 35-60% of butanone and 40-65% of cyclohexane in terms of mass percentage.

3. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1 or 2, characterized in that: The active agent is IPDI, and the added mass of the active agent is 2.5-5% of the mass of the reflux condensation reaction solution.

4. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1 or 2, characterized in that: The added mass of the active agent is 2.5-5% of the mass of the reflux condensation reaction solution; the active agent is composed of 75-95% IPDI and 5-25% DBTDL in mass percentage.

5. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1 or 2, characterized in that: After adding the DMPA and the chain extender, the mixed solution is subjected to a chain extension reaction at 75-100° C. for 1.5-2.5 hours.

6. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1 or 2, characterized in that: The amount of ethylenediamine added is 15-35% of the volume of the solution after centrifugation.

7. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1 or 2, characterized in that: The ratio of the added amount of the epoxy resin to the added propylene is 1:(6-9).

8. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1 or 2, characterized in that: The added mass of the TMP is 25-40% of the added mass of the epoxy resin.

9. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1, characterized in that: The surface of the second film layer is also covered with a lubricant layer; the lubricant layer is composed of 25-80% erucamide and 20-75% ethanol in mass percentage.

10. The aluminum-plastic film processing technology based on modified polypropylene glue according to claim 1, characterized in that: The nylon adhesive layer is composed of 20-40% of polyurethane resin, 12-50% of isocyanate and 15-30% of ethyl acetate in terms of mass percentage.

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