A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method

Abstract

This invention relates to the field of adhesives, specifically to a modified polyolefin adhesive for aluminum-plastic composite films and its preparation method. The addition of fillers in this invention reduces the shrinkage rate and coefficient of thermal expansion during the adhesive's curing process, while also increasing its adhesive strength. The addition of a polar thermoplastic phenolic resin enables the adhesive to have a strong bonding effect on the adhered materials. To improve the adhesive's adsorption properties, active substances are introduced, making it easier for the various components within the adhesive to cross-link and firmly bond the adhesive to the strongly polar adhered materials. The modified polyolefin adhesive for aluminum-plastic composite films prepared by this invention has a simple process, is easy to operate, and cures at room temperature with a long shelf life. Furthermore, no surface treatment is required on the adhered materials, making it very convenient to use.

Description

Technical Field

[0001] This invention relates to the field of adhesives, and in particular to a modified polyolefin adhesive for aluminum-plastic composite films and its preparation method. Background Technology

[0002] As the primary packaging material for soft-pack lithium batteries, aluminum-plastic film consists of a substrate, aluminum foil, a sealing layer, and adhesives. Its market size is projected to exceed 100 billion yuan in the next five years. A typical aluminum-plastic film typically has a nylon outer substrate layer, primarily serving to protect against pollution, corrosion, and external damage. The middle layer is an aluminum foil layer, providing waterproofing, barrier properties, and shaping the product. The inner layer is a polypropylene heat-sealing layer, mainly for sealing and bonding, and also serves to separate the aluminum layer from the electrolyte, preventing electrolyte leakage and corrosion of the aluminum foil. The layers are bonded together using adhesives or bonding resins to achieve strong interlayer connections.

[0003] CN202211218901.9: This invention relates to the field of adhesives, specifically to a method for preparing a novel adhesive for aluminum-plastic films. The method uses 3-aminophthalic acid, lithium acrylate, maleimide, toluene, potassium tert-butoxide, neopentyl glycol, ethylene glycol, stabilizer, and catalyst to synthesize a polyester polyol for the adhesive. This polyol is then combined with carborane polyester diol, ethyl acetate, and a curing agent to prepare the novel adhesive for aluminum-plastic films. The adhesive prepared by this invention exhibits excellent adhesion and strong resistance to electrolytes, overcoming the problems of poor long-term resistance to electrolytes and easy peeling of traditional aluminum-plastic composite film adhesives.

[0004] CN202211242704.0: This invention relates to the field of aluminum-plastic composite film technology, specifically to a method for preparing an aluminum-plastic composite film for lithium batteries. The method uses titanium dioxide, methoxy polyethylene oxide acrylate, vinyl guanidine, and nickel acrylate to modify the surface of a polypropylene film. The modified polypropylene film is then irradiated with gamma rays and laminated with nylon / aluminum foil using an adhesive to obtain the aluminum-plastic composite film for lithium batteries. The aluminum-plastic composite film prepared by this invention has high peel strength between the aluminum foil layer and the heat-sealing layer (polypropylene film), improving the barrier properties and electrolyte resistance of the lithium battery soft packaging material, thus enabling the lithium battery to have long-term stability.

[0005] CN201510279341.1 discloses an adhesive for flexible plastic packaging and its preparation method. Addressing the shortcomings of existing adhesives, this invention is prepared from calcium hydroxide, lignin, hydroxypropyl methylcellulose, starch cellulose, esters, polyvinyl alcohol powder, soybean fatty acids, vinyl acetate, plasticizer, dispersant, curing agent, and emulsifier according to a specific preparation method. The adhesive of this invention not only has good stability and fast drying speed during use, but also has a simple preparation process, overcoming the shortcomings of traditional adhesives for flexible plastic packaging and possessing strong practical value.

[0006] However, the adhesives prepared by the aforementioned patents and existing technologies have large shrinkage rates and coefficients of thermal expansion during the curing process, poor adhesion, heat resistance, and wear resistance. The curing conditions and tackiness of the adhesives still need further improvement. Summary of the Invention

[0007] To address the aforementioned technical problems and overcome the shortcomings of existing technologies, this invention provides a modified polyolefin adhesive for aluminum-plastic composite films and its preparation method.

[0008] The technical solution of the present invention to solve the above problems is as follows:

[0009] The first aspect of this method provides a method for preparing a modified polyolefin adhesive for aluminum-plastic composite films:

[0010] S1: By weight, add 20-40 parts of maleic anhydride-grafted polypropylene to the reactor, then add 10-20 parts of ethyl acetate, 65-80 parts of toluene, 10-20 parts of acetone, and 10-20 parts of thermoplastic phenolic resin, and stir continuously until dissolved.

[0011] S2: Heat and stir, then add 10-20 parts of chloroform dropwise until completely dissolved;

[0012] S3: After cooling to room temperature, add 0.1-1 parts filler and 0.1-1 parts antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film.

[0013] As a preferred embodiment of the above technical solution, S2 is heated to 70-80℃.

[0014] As a preferred embodiment of the above technical solution, the stirring rate is 200-500 rpm.

[0015] As a preferred embodiment of the above technical solution, the filler is quartz powder, talc powder, alumina, or titanium dioxide.

[0016] As a preferred embodiment of the above technical solution, the antioxidant is commercially available antioxidant 2246.

[0017] A second aspect of this method provides a method for preparing maleic anhydride-grafted polypropylene:

[0018] By weight, 400-500 parts of polypropylene, 10-20 parts of maleic anhydride, 3-7 parts of high-temperature resistant synergist, 20-40 parts of xylene, and 8-20 parts of initiator are added sequentially to a stirred reactor. The reactor is then placed in an oil bath constant temperature bath, heated, and nitrogen is introduced while stirring to carry out the grafting reaction, thereby obtaining maleic anhydride-grafted polypropylene.

[0019] As a preferred embodiment of the above technical solution, the reaction temperature is 110-130℃ and the reaction time is 130-160min.

[0020] As a preferred embodiment of the above technical solution, the initiator is benzoyl peroxide or dicumyl peroxide.

[0021] A third aspect of this method provides a method for preparing a high-temperature resistant synergist:

[0022] By weight, add 2-5 parts of N,N'-M-phenylene maleic acid amide, 0.03-0.5 parts of aminated cage-like silsesquioxane, 10-18 parts of 1,4-diamino-2,5-divinylbenzene, 3-6 parts of triethylamine, and 100-160 parts of N,N-dimethylformamide to a reaction vessel, heat, and stir to react; remove N,N-dimethylformamide by vacuum distillation to obtain a high-temperature synergist.

[0023] As a preferred embodiment of the above technical solution, the reaction temperature is 70-80℃ and the reaction time is 50-130min.

[0024] Reaction mechanism:

[0025] The N,N'-M-phenylene maleic amide undergoes amino addition reactions with aminated cage-like silsesquioxane and 1,4-diamino-2,5-divinylbenzene, respectively, to obtain an unsaturated high-temperature resistant synergist; then it participates in a grafting reaction to obtain maleic anhydride-grafted polypropylene containing silsesquioxane, thereby improving the high-temperature resistance of the adhesive. Technical effects:

[0026] The present invention provides a modified polyolefin adhesive for aluminum-plastic composite films and its preparation method. Compared with the prior art, the present invention has the following significant advantages:

[0027] 1. The filler is added in this invention to reduce the shrinkage rate and thermal expansion coefficient of the adhesive during the curing process. In addition, the filler can improve the cohesive strength, adhesion and heat resistance of the adhesive, improve the impact toughness and mechanical strength of the adhesive layer, and also improve its hardness, compressive strength and wear resistance, while also increasing its adhesive force.

[0028] 2. The modified polyolefin adhesive for aluminum-plastic composite film prepared by this invention contains a polar substance, thermoplastic phenolic resin, which enables the adhesive to have a strong adhesive effect on the adhered objects.

[0029] 3. In order to improve the adsorption of the adhesive, the present invention introduces active substances, making it easier for the various components in the adhesive to cross-link with each other, and making the adhesive firmly bonded to the strongly polar bonded material.

[0030] 4. The modified polyolefin adhesive for aluminum-plastic composite films prepared by this invention has a simple process and is easy to operate. Furthermore, the adhesive can be cured at room temperature and has a long shelf life. In addition, no surface treatment is required for the adhered material, making it very convenient to use.

[0031] 5. The modified polyolefin adhesive for aluminum-plastic composite films prepared by this invention can not only bond aluminum-plastic composite films well, but also be used to bond other materials. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, a detailed description of specific embodiments is provided below. Many specific details are set forth in the following description to provide a thorough understanding of the invention. However, the invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] Example 1

[0035] A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method, comprising the following steps:

[0036] S1: Add 20g of maleic anhydride-grafted polypropylene to the reactor, then add 10g of ethyl acetate, 65g of toluene, 10g of acetone, and 10g of thermoplastic phenolic resin, and stir continuously until dissolved.

[0037] S2: Heat, stir, and add 10g of chloroform dropwise until it is completely dissolved;

[0038] S3: After cooling to room temperature, add 0.1g of filler and 0.1g of antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film.

[0039] The S2 is heated to 70°C.

[0040] The stirring rate is 200 rpm.

[0041] The filler is quartz powder.

[0042] The antioxidant mentioned is commercially available antioxidant 2246.

[0043] The method for preparing maleic anhydride-grafted polypropylene is as follows:

[0044] 400g of polypropylene, 10g of maleic anhydride, 3g of high-temperature synergist, 20g of xylene, and 8g of initiator were added to a stirred reactor in sequence. The reactor was placed in an oil bath constant temperature bath, heated, and nitrogen gas was introduced while stirring to carry out the grafting reaction, thus obtaining maleic anhydride-grafted polypropylene.

[0045] The reaction temperature is 110℃ and the reaction time is 130 min.

[0046] The initiator is benzoyl peroxide.

[0047] The preparation method of the high-temperature resistant synergist is as follows:

[0048] 2g of N,N'-M-phenylene maleic acid amide, 0.03g of aminated cage-like silsesquioxane, 10g of 1,4-diamino-2,5-divinylbenzene, 3g of triethylamine, and 100g of N,N-dimethylformamide were added to a reaction vessel. The mixture was heated and stirred to react. N,N-dimethylformamide was removed by vacuum distillation to obtain a high-temperature resistant synergist.

[0049] The reaction temperature is 70℃ and the reaction time is 50 min.

[0050] Example 2

[0051] A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method, comprising the following steps:

[0052] S1: Add 25g of maleic anhydride-grafted polypropylene to the reactor, then add 14g of ethyl acetate, 70g of toluene, 14g of acetone, and 14g of thermoplastic phenolic resin, and stir continuously until dissolved.

[0053] S2: Heat, stir, and add 14g of chloroform dropwise until it is completely dissolved;

[0054] S3: After cooling to room temperature, add 0.4g of filler and 0.4g of antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film.

[0055] The S2 is heated to 75°C.

[0056] The stirring rate is 300 rpm.

[0057] The filler is talc powder.

[0058] The antioxidant mentioned is commercially available antioxidant 2246.

[0059] The method for preparing maleic anhydride-grafted polypropylene is as follows:

[0060] 440g of polypropylene, 14g of maleic anhydride, 4g of high-temperature synergist, 25g of xylene, and 12g of initiator were added to a stirred reactor in sequence. The reactor was placed in an oil bath constant temperature bath, heated, and nitrogen gas was introduced while stirring to carry out the grafting reaction, thus obtaining maleic anhydride-grafted polypropylene.

[0061] The reaction temperature was 115℃ and the reaction time was 140 min.

[0062] The initiator is benzoyl peroxide.

[0063] The preparation method of the high-temperature resistant synergist is as follows:

[0064] Add 3g of N,N'-M-phenylene maleic acid amide, 0.2g of aminated cage-like silsesquioxane, 13g of 1,4-diamino-2,5-divinylbenzene, 4g of triethylamine, and 110g of N,N-dimethylformamide to a reaction vessel, heat, and stir to react; remove N,N-dimethylformamide by vacuum distillation to obtain a high-temperature resistant synergist.

[0065] The reaction temperature is 75℃ and the reaction time is 80 min.

[0066] Example 3

[0067] A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method, comprising the following steps:

[0068] S1: Add 35g of maleic anhydride-grafted polypropylene to the reactor, then add 18g of ethyl acetate, 75g of toluene, 18g of acetone, and 18g of thermoplastic phenolic resin, and stir continuously until dissolved.

[0069] S2: Heat, stir, and add 18g of chloroform dropwise until it is completely dissolved;

[0070] S3: After cooling to room temperature, add 0.8g of filler and 0.8g of antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film.

[0071] The S2 is heated to 75°C.

[0072] The stirring rate is 400 rpm.

[0073] The filler is alumina.

[0074] The antioxidant mentioned is commercially available antioxidant 2246.

[0075] The method for preparing maleic anhydride-grafted polypropylene is as follows:

[0076] 480g of polypropylene, 18g of maleic anhydride, 6g of high-temperature synergist, 35g of xylene, and 16g of initiator were added to a stirred reactor in sequence. The reactor was placed in an oil bath constant temperature bath, heated, and nitrogen gas was introduced while stirring to carry out the grafting reaction, thus obtaining maleic anhydride-grafted polypropylene.

[0077] The reaction temperature is 125℃ and the reaction time is 150 min.

[0078] The initiator is dicumyl peroxide.

[0079] The preparation method of the high-temperature resistant synergist is as follows:

[0080] Add 4g of N,N'-M-phenylene maleic amide, 0.4g of aminated cage-like silsesquioxane, 16g of 1,4-diamino-2,5-divinylbenzene, 5g of triethylamine, and 150g of N,N-dimethylformamide to a reaction vessel, heat, and stir to react; remove N,N-dimethylformamide by vacuum distillation to obtain a high-temperature resistant synergist.

[0081] The reaction temperature was 75℃ and the reaction time was 110 min.

[0082] Example 4

[0083] A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method, comprising the following steps:

[0084] S1: Add 40g of maleic anhydride-grafted polypropylene to the reactor, then add 20g of ethyl acetate, 80g of toluene, 20g of acetone, and 20g of thermoplastic phenolic resin, and stir continuously until dissolved.

[0085] S2: Heat, stir, and add 20g of chloroform dropwise until it is completely dissolved;

[0086] S3: After cooling to room temperature, add 1g of filler and 1g of antioxidant to obtain a modified polyolefin adhesive for aluminum-plastic composite film.

[0087] The S2 is heated to 80°C.

[0088] The stirring rate is 500 rpm.

[0089] The filler is titanium dioxide.

[0090] The antioxidant mentioned is commercially available antioxidant 2246.

[0091] The method for preparing maleic anhydride-grafted polypropylene is as follows:

[0092] 500g of polypropylene, 20g of maleic anhydride, 7g of high-temperature synergist, 40g of xylene, and 20g of initiator were added to a stirred reactor in sequence. The reactor was placed in an oil bath constant temperature bath, heated, and nitrogen gas was introduced while stirring to carry out the grafting reaction, thus obtaining maleic anhydride-grafted polypropylene.

[0093] The reaction temperature was 130℃ and the reaction time was 160 min.

[0094] The initiator is dicumyl peroxide.

[0095] The preparation method of the high-temperature resistant synergist is as follows:

[0096] Add 5g of N,N'-M-phenylene maleic acid amide, 0.5g of aminated cage-like silsesquioxane, 18g of 1,4-diamino-2,5-divinylbenzene, 6g of triethylamine, and 160g of N,N-dimethylformamide to a reaction vessel, heat, and stir to react; remove N,N-dimethylformamide by vacuum distillation to obtain a high-temperature resistant synergist.

[0097] The reaction temperature is 80℃ and the reaction time is 130 min.

[0098] Comparative Example 1

[0099] A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method, comprising the following steps:

[0100] S1: Add 20g of maleic anhydride-grafted polypropylene to the reactor, then add 10g of ethyl acetate, 65g of toluene, 10g of acetone, and 10g of thermoplastic phenolic resin, and stir continuously until dissolved.

[0101] S2: Heat, stir, and add 10g of chloroform dropwise until it is completely dissolved;

[0102] S3: After cooling to room temperature, add 0.1g of filler and 0.1g of antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film.

[0103] The S2 is heated to 70°C.

[0104] The stirring rate is 200 rpm.

[0105] The filler is quartz powder.

[0106] The antioxidant mentioned is commercially available antioxidant 2246.

[0107] The method for preparing maleic anhydride-grafted polypropylene is as follows:

[0108] 400g of polypropylene, 10g of maleic anhydride, 20g of xylene, and 8g of initiator were added to a stirred reactor in sequence. The reactor was placed in an oil bath constant temperature bath, heated, and nitrogen gas was introduced while stirring to carry out the grafting reaction, thus obtaining maleic anhydride-grafted polypropylene.

[0109] The reaction temperature is 110℃ and the reaction time is 130 min.

[0110] The initiator is benzoyl peroxide.

[0111] Comparative Example 2

[0112] A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method, comprising the following steps:

[0113] S1: Add 20g of maleic anhydride-grafted polypropylene to the reactor, then add 10g of ethyl acetate, 65g of toluene, and 10g of acetone, and stir continuously until dissolved.

[0114] S2: Heat, stir, and add 10g of chloroform dropwise until it is completely dissolved;

[0115] S3: After cooling to room temperature, add 0.1g of filler and 0.1g of antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film.

[0116] The S2 is heated to 70°C.

[0117] The stirring rate is 200 rpm.

[0118] The filler is quartz powder.

[0119] The antioxidant mentioned is commercially available antioxidant 2246.

[0120] The method for preparing maleic anhydride-grafted polypropylene is as follows:

[0121] 400g of polypropylene, 10g of maleic anhydride, 3g of high-temperature synergist, 20g of xylene, and 8g of initiator were added to a stirred reactor in sequence. The reactor was placed in an oil bath constant temperature bath, heated, and nitrogen gas was introduced while stirring to carry out the grafting reaction, thus obtaining maleic anhydride-grafted polypropylene.

[0122] The reaction temperature is 110℃ and the reaction time is 130 min.

[0123] The initiator is benzoyl peroxide.

[0124] The preparation method of the high-temperature resistant synergist is as follows:

[0125] 2g of N,N'-M-phenylene maleic acid amide, 0.03g of aminated cage-like silsesquioxane, 10g of 1,4-diamino-2,5-divinylbenzene, 3g of triethylamine, and 100g of N,N-dimethylformamide were added to a reaction vessel. The mixture was heated and stirred to react. N,N-dimethylformamide was removed by vacuum distillation to obtain a high-temperature resistant synergist.

[0126] The reaction temperature is 70℃ and the reaction time is 50 min.

[0127] Comparative Example 3

[0128] A modified polyolefin adhesive for aluminum-plastic composite films and its preparation method, comprising the following steps:

[0129] S1: Add 20g of maleic anhydride-grafted polypropylene to the reactor, then add 65g of toluene, 10g of acetone, and 10g of thermoplastic phenolic resin, and stir continuously until dissolved.

[0130] S2: Heat, stir, and add 10g of chloroform dropwise until it is completely dissolved;

[0131] S3: After cooling to room temperature, add 0.1g of filler and 0.1g of antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film.

[0132] The S2 is heated to 70°C.

[0133] The stirring rate is 200 rpm.

[0134] The filler is quartz powder.

[0135] The antioxidant mentioned is commercially available antioxidant 2246.

[0136] The method for preparing maleic anhydride-grafted polypropylene is as follows:

[0137] 400g of polypropylene, 10g of maleic anhydride, 3g of high-temperature synergist, 20g of xylene, and 8g of initiator were added to a stirred reactor in sequence. The reactor was placed in an oil bath constant temperature bath, heated, and nitrogen gas was introduced while stirring to carry out the grafting reaction, thus obtaining maleic anhydride-grafted polypropylene.

[0138] The reaction temperature is 110℃ and the reaction time is 130 min.

[0139] The initiator is benzoyl peroxide.

[0140] The preparation method of the high-temperature resistant synergist is as follows:

[0141] 2g of N,N'-M-phenylene maleic acid amide, 0.03g of aminated cage-like silsesquioxane, 10g of 1,4-diamino-2,5-divinylbenzene, 3g of triethylamine, and 100g of N,N-dimethylformamide were added to a reaction vessel. The mixture was heated and stirred to react. N,N-dimethylformamide was removed by vacuum distillation to obtain a high-temperature resistant synergist.

[0142] The reaction temperature is 70℃ and the reaction time is 50 min.

[0143] Example Evaluation Method:

[0144] 1. Gelization time test:

[0145] The gelation time of the adhesive sample at room temperature was tested using a BK-1 gelation time tester. 0.2 ml of adhesive sample was dropped onto a plate using a syringe. Timing was started after 20 seconds, and then stirring was initiated to spread the adhesive sample evenly on the plate. Stirring was performed 2-3 times per second until stringing or clumping occurred, at which point timing was stopped, and the time was recorded.

[0146] 2. Peel strength test:

[0147] The aluminum-plastic composite film prepared using the adhesives described in Examples 1-4 and Comparative Examples 1-3 was cut into strips with a width of 25±0.5mm and bonded together with glass slides with a width of 25±0.5mm. After 2 hours, the average peel force was tested at a speed of 100mm / min using a universal testing machine. The peel strength was calculated based on the peel force (no less than 5 samples per specimen).

[0148] 3. Heat resistance test:

[0149] The adhesive was applied to the surface of the wood, which was 300mm × 300mm in size. After baking at 80℃ for 5 hours, the wood was removed and cooled to room temperature. The resulting wood was then subjected to a crack rate test.

[0150] The gelation time, peel strength, and cracking rate of the adhesives prepared in the above embodiments and comparative examples are shown in the following test results:

[0151] Table: Test results of gelation time, peel strength, and cracking rate for the above specific implementation schemes

[0152]

[0153]

[0154] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for preparing a modified polyolefin adhesive for aluminum-plastic composite films, comprising the following steps: S1: By weight, add 20-40 parts of maleic anhydride-grafted polypropylene to the reactor, then add 10-20 parts of ethyl acetate, 65-80 parts of toluene, 10-20 parts of acetone, and 10-20 parts of thermoplastic phenolic resin, and stir continuously until dissolved. S2: Heat and stir, then add 10-20 parts of chloroform dropwise until completely dissolved; S3: After cooling to room temperature, add 0.1-1 parts filler and 0.1-1 parts antioxidant to obtain modified polyolefin adhesive for aluminum-plastic composite film; The method for preparing maleic anhydride-grafted polypropylene is as follows: By weight, 400-500 parts of polypropylene, 10-20 parts of maleic anhydride, 3-7 parts of high-temperature resistant synergist, 20-40 parts of xylene, and 8-20 parts of initiator are added to a stirred reactor. The reactor is placed in an oil bath constant temperature bath, heated, and nitrogen is introduced while stirring to carry out the grafting reaction to obtain maleic anhydride grafted polypropylene. The preparation method of the high-temperature resistant synergist is as follows: By weight, add 2-5 parts of N,N''-M-phenylene maleic acid amide, 0.03-0.5 parts of aminated cage-like silsesquioxane, 10-18 parts of 1,4-diamino-2,5-divinylbenzene, 3-6 parts of triethylamine, and 100-160 parts of N,N-dimethylformamide to a reaction vessel, heat, and stir to react; remove N,N-dimethylformamide by vacuum distillation to obtain a high-temperature synergist.

2. The method for preparing a modified polyolefin adhesive for aluminum-plastic composite films according to claim 1, characterized in that: The S2 is heated to 70-80℃.

3. The method for preparing a modified polyolefin adhesive for aluminum-plastic composite films according to claim 1, characterized in that: The stirring speed is 200-500 rpm.

4. The method for preparing a modified polyolefin adhesive for aluminum-plastic composite films according to claim 1, characterized in that: The filler is quartz powder, talc powder, alumina, or titanium dioxide.

5. The method for preparing a modified polyolefin adhesive for aluminum-plastic composite films according to claim 1, characterized in that: The antioxidant mentioned is commercially available antioxidant 2246.

6. The method for preparing a modified polyolefin adhesive for aluminum-plastic composite films according to claim 1, characterized in that: The grafting reaction is carried out at a temperature of 110-130℃ for 130-160 min.

7. The method for preparing a modified polyolefin adhesive for aluminum-plastic composite films according to claim 1, characterized in that: The initiator is benzoyl peroxide or dicumyl peroxide.

8. The method for preparing a modified polyolefin adhesive for aluminum-plastic composite films according to claim 1, characterized in that: The stirring reaction temperature of the high-temperature resistant synergist is 70-80℃, and the reaction time is 50-130 min.

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