Pe-pa based composite film, manufacturing process and application in bib liquid packaging

Abstract

The application relates to the technical field of BIB liquid packaging material research and development, and discloses a PE-PA-based composite film, a manufacturing process and application in BIB liquid packaging, in particular to the following: a PE-PA compatilizer is synthesized; ring-opening reaction occurs between the epoxy functional group of the PE-PA compatilizer and the amino functional group or the carboxyl functional group at the molecular chain end of a PA resin to obtain a PE-PA compatilizer grafted nylon resin; and physical anchoring occurs between the long-chain alkane structure on the PE-PA compatilizer grafted nylon resin and the molecular chain of a PE resin to obtain a PE-PA alloy master batch; low-density polyethylene resin is used as support layer raw material, the PE-PA alloy master batch is used as functional layer raw material, and metallocene polyethylene resin is used as heat sealing layer raw material; a three-layer co-extrusion blow molding film process is adopted to prepare the PE-PA composite film; and the film product has excellent comprehensive performance and can be used for manufacturing BIB bag bodies.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of BIB liquid packaging material research and development, in particular to a PE-PA-based composite film, a manufacturing process and application in BIB liquid packaging. BACKGROUND

[0002] Driven by consumer demand for beverage packaging, a new type of beverage packaging form has emerged, namely bag-in-box (BIB). The bag-in-box BIB structure includes an outer box, a bag body and a valve. The BIB bag body is made of flexible soft packaging material. Since the bag body is in direct contact with the contents, the flexible soft packaging material used to manufacture the bag body needs to meet the following key performance requirements: extremely high barrier property, excellent mechanical strength, good heat sealing performance, food hygiene and safety, and good flexibility (flexibility allows the inner bag to collapse smoothly when draining, avoiding the formation of a vacuum, allowing the liquid to flow out smoothly, and air cannot be sucked into the bag).

[0003] The PA-PE composite film can fully combine the high strength and high oxygen barrier properties of PA with the excellent heat sealing property, water barrier property, flexibility and safety of PE. Therefore, the PA-PE composite film can meet the core performance requirements of the flexible soft packaging material used to manufacture the BIB bag body.

[0004] However, due to the large difference in molecular polarity, chain structure and viscoelasticity ratio between PE and PA, they belong to a thermodynamically incompatible system. Therefore, the modern packaging industry usually uses a multifunctional adhesive resin combined with a multi-layer co-extrusion technology to overcome the interface peeling and barrier failure problems of the two.

[0005] Research has found that multifunctional adhesive resins cannot fuse two or more incompatible polymers into an alloy material with balanced properties, nor can they improve the impact strength, ductility and thermal stability of the blend by refining the size and stability of the phase morphology.

[0006] Based on this, the present application aims to develop a new type of compatibilizer for improving the interface effect between PE and PA, and thereby composite PE and PA into a new alloy material for manufacturing BIB bag bodies. SUMMARY

[0007] The application develops and prepares a PE-PA compatilizer, which improves the compatibility of PE and PA by physically anchoring the PE phase, chemically bonding the PA phase and improving the PE-PA interface by the synergistic means of rigid organic-inorganic hybrid POSS material, so that the prepared PE-PA alloy material has balanced and stable performance, and accordingly provides a PE-PA composite film, which has very excellent barrier performance and mechanical performance, and the hygiene performance meets the national standard requirements, and can be applied to the BIB liquid packaging field as an inner layer flexible packaging bag material.

[0008] The PE-PA-based composite film is a PE-PA composite film, and the product structure of the PE-PA composite film is sequentially arranged as follows:

[0009] The support layer is prepared from 100wt% low-density polyethylene resin, and the dosage is 20-30 parts by weight;

[0010] The functional layer is prepared from 100wt% PE-PA alloy masterbatch, and the dosage is 40-60 parts by weight;

[0011] The heat-sealing layer is prepared from 100wt% metallocene polyethylene resin, and the dosage is 20-30 parts by weight;

[0012] The PE-PA alloy masterbatch is prepared from 40wt% low-density polyethylene resin, 45-55wt% nylon resin and 5-15wt% PE-PA compatilizer.

[0013] Preferably, the thickness of the PE-PA composite film is 100-150μm.

[0014] The manufacturing process of the PE-PA-based composite film comprises the following steps:

[0015] Step one: preparing a PE-PA compatilizer;

[0016] Step two: preparing a PE-PA compatilizer grafted nylon resin by ring-opening reaction of the epoxy functional group of the PE-PA compatilizer with the amino functional group or carboxyl functional group at the molecular chain end of the PA resin, and preparing a PE-PA alloy masterbatch by physical anchoring of the long-chain alkane structure on the PE-PA compatilizer grafted nylon resin with the PE resin molecular chain;

[0017] Step three: according to the formula of the PE-PA composite film, the raw materials of each layer are sequentially fed into the hoppers of the three single-screw extruders of the three-layer co-extrusion film blowing machine set, the molten resins are converged at the die head through the flow divider, and the PE-PA composite film is prepared by extrusion blowing traction, cooling and winding through the die.

[0018] Preferably, the preparation method of the PE-PA compatibilizer is as follows:

[0019] Through nucleophilic substitution reaction of 1 mole equivalent of -NH2 functional group of oleylamine with 0.91-0.95 mole equivalent of chloro functional group of 1-chlorooctadecane, a long-chain alkane structured oleylamine derivative is generated;

[0020] Through nucleophilic substitution reaction of 1 mole equivalent of -chloro functional group of 1,5-dichloropentane with 2.01-2.05 mole equivalent of -NH- functional group of long-chain alkane structured oleylamine derivative, a bis(long-chain alkane structured oleylamine group) diamine monomer is generated;

[0021] Using nucleophilic substitution reaction mechanism, through quaternary amination reaction of 1 mole equivalent of tertiary amine group of bis(long-chain alkane structured oleylamine group) diamine monomer with 2.05-2.09 mole equivalent of chloro functional group of 3-chloropropyl heptaisobutyl POSS, a bis(long-chain alkane structured oleylamine group) POSS-based diamine salt is generated;

[0022] Through oxidation of alkenyl functional group in the molecular structure of bis(long-chain alkane structured oleylamine group) POSS-based diamine salt by organic peroxy acid into epoxy functional group, a PE-PA compatibilizer is generated.

[0023] Preferably, the organic peroxy acid is one of peroxoacetic acid, peroxobenzoic acid, and m-chloroperbenzoic acid.

[0024] Preferably, the preparation method of the PE-PA alloy master batch is as follows:

[0025] Dissolve 9-11 parts by weight of nylon resin in N,N-dimethylformamide solvent, under the action of nitrogen protection, add 1-3 parts by weight of PE-PA compatibilizer, heat to 60-80℃ and stir for 4-8h, remove the solvent by rotary evaporation, and dry to obtain PE-PA compatibilizer grafted nylon resin, i.e. long-chain alkane structured POSS type nylon;

[0026] Mix 4 parts by weight of low-density polyethylene resin and 6 parts by weight of long-chain alkane structured POSS type nylon in a high-speed mixer, extrude and granulate by a twin-screw extruder, and dry to obtain a PE-PA alloy master batch.

[0027] Preferably, the temperature of zone 1-6 of the twin-screw extruder used for preparing the PE-PA alloy master batch is 190-210℃, 210-230℃, 240-260℃, 250-260℃, 260-270℃, and 255-265℃, respectively.

[0028] Preferably, the process parameters of the single-screw extruder used for preparing the PE-PA composite film are as follows:

[0029] Functional layer: 1-3 zone temperature is 190-210℃, 220-240℃, 260-280℃ in turn, the flow channel temperature is 255-265℃.

[0030] Supporting layer: 1-3 zone temperature is 110-130℃, 145-155℃, 160-175℃ in turn, the flow channel temperature is 160-170℃;

[0031] Heat-sealing layer: 1-3 zone temperature is 110-130℃, 140-160℃, 165-180℃ in turn, the flow channel temperature is 160-170℃.

[0032] Beneficial effects:

[0033] The application firstly introduces long-chain alkane structure by nucleophilic substitution reaction of oleylamine and 1-chlorooctadecane, then expands oleylamine and long-chain alkane structure by taking 1,5-dichloropentane as a molecular expansion framework, then introduces rigid organic-inorganic hybrid POSS group by quaternary ammonium reaction, and finally prepares PE-PA compatibilizer by epoxidation treatment of alkenyl functional group of oleylamine;

[0034] The PE-PA compatibilizer realizes chemical bonding effect by ring-opening reaction of epoxy functional group and amino functional group or carboxyl functional group at the molecular chain end of PA, and then realizes physical anchoring effect by the characteristics of long-chain alkane structure and PE molecular chain chemical structure being highly similar, so that PE-PA alloy material is prepared, and PE-PA alloy master batch is prepared from the PE-PA alloy material;

[0035] The low-density polyethylene resin is used as the supporting layer raw material, the PE-PA alloy master batch is used as the functional raw material, and the metallocene polyethylene resin is used as the heat-sealing layer raw material, so that the PE-PA composite film is prepared by adopting three-layer co-extrusion blow molding process, the film product has excellent comprehensive performance, and can be used for manufacturing BIB bag body. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a chemical structural formula of long-chain alkane structured oleylamine derivative;

[0037] Figure 2 It is a chemical structural formula of bis(long-chain alkane structured oleylamine group) diamine monomer;

[0038] Figure 3 It is a chemical structural formula of bis(long-chain alkane structured oleylamine group) POSS-based diamine salt;

[0039] Figure 4 It is a chemical structural formula of PE-PA compatibilizer;

[0040] Figure 5 The performance test results of the PE-PA composite film. DETAILED DESCRIPTION Example One:

[0041] A PE-PA composite film I, the product structure is:

[0042] The first layer: a support layer prepared from 100wt% low-density polyethylene resin (brand LD 150DW), the amount is 25 parts by weight;

[0043] The second layer: a functional layer prepared from 100wt% PE-PA alloy masterbatch, the amount is 50 parts by weight;

[0044] The third layer: a heat-seal layer prepared from 100wt% metallocene polyethylene resin (brand SP4020), the amount is 25 parts by weight;

[0045] Among them, the formula of PE-PA alloy masterbatch is: 40wt% low-density polyethylene resin, 50wt% nylon resin (brand FG170) and 10wt% PE-PA compatibilizer;

[0046] The synthesis process of PE-PA compatibilizer is as follows:

[0047] Process one, preparation of long-chain alkane structured oleylamine derivative: through nucleophilic substitution reaction of 1 mole equivalent of -NH2 functional group of oleylamine and 0.93 mole equivalent of chlorine functional group of 1-chlorooctadecane, long-chain alkane structured oleylamine derivative is generated, its chemical structure formula is as shown in Figure 1 The specific preparation steps are: 5.4g oleylamine and 50mL N,N-dimethylformamide are added to a three-necked flask, stirred at room temperature until completely dissolved, then 50mL N,N-dimethylformamide solution dissolved with 5.6g 1-chlorooctadecane and 5.6mL triethylamine are added to the three-necked flask in turn, heated to 70℃ and stirred for 6h, cooled to room temperature, removed the solvent by rotary evaporation, washed with deionized water, and vacuum dried at 50℃ for 8h to obtain long-chain alkane structured oleylamine derivative;

[0048] Process two, preparation of bis(long-chain alkane structured oleylamine group) diamine monomer: through nucleophilic substitution reaction of 1 mole equivalent of chlorine functional group of 1,5-dichloropentane and 2.03 mole equivalent of -NH- functional group of long-chain alkane structured oleylamine derivative, bis(long-chain alkane structured oleylamine group) diamine monomer is generated, its chemical structure formula is as shown in Figure 2The specific preparation steps are as follows: 5.2 g of long-chain alkane structured oleylamine derivative and 50 mL of N,N-dimethylformamide are added to a three-necked flask, stirred at room temperature until completely dissolved, then 10 mL of N,N-dimethylformamide solution dissolving 0.7 g of 1,5-dichloropentane and 3.7 mL of triethylamine are sequentially added to the three-necked flask, the temperature is raised to 70°C, and stirring is carried out for 8 h, then the temperature is cooled to room temperature, the solvent is removed by rotary evaporation, washed with deionized water, and vacuum dried at 50°C for 8 h to obtain a bis(long-chain alkane structured oleylamine group) diamine monomer;

[0049] Process three, preparation of bis(long-chain alkane structured oleylamine group) POSS-based diamine salt: using the mechanism of nucleophilic substitution reaction, by quaternization reaction of 1 mole equivalent of tertiary amine group of bis(long-chain alkane structured oleylamine group) diamine monomer and 2.05 mole equivalents of chlorine functional group of 3-chloropropyl heptaisobutyl POSS (CAS No. 480438-84-4), to generate bis(long-chain alkane structured oleylamine group) POSS-based diamine salt, the chemical structural formula is as shown in Figure 3 The specific preparation steps are as follows: 2.7 g of bis(long-chain alkane structured oleylamine group) diamine monomer and 30 mL of N,N-dimethylformamide are added to a three-necked flask, stirred at room temperature until completely dissolved, then 40 mL of N,N-dimethylformamide solution dissolving 4.4 g of 3-chloropropyl heptaisobutyl POSS is added to the three-necked flask, the temperature is raised to 75°C, and stirring is carried out for 5 h, then the temperature is cooled to room temperature, the solvent is removed by rotary evaporation, vacuum dried at 50°C for 12 h to obtain bis(long-chain alkane structured oleylamine group) POSS-based diamine salt;

[0050] Process four, preparation of PE-PA compatibilizer: under the oxidation of organic peroxy acid, by epoxidation reaction of the alkenyl functional group of bis(long-chain alkane structured oleylamine group) POSS-based diamine salt, to generate PE-PA compatibilizer, the chemical structural formula is as shown in Figure 4 The specific preparation steps are as follows: 3.0 g of bis(long-chain alkane structured oleylamine group) POSS-based diamine salt and 30 mL of chloroform are added to a three-necked flask, stirred at room temperature until completely dissolved, then 20 mL of chloroform solution dissolving 1.5 g of m-chloroperoxybenzoic acid is added to the three-necked flask, the temperature is raised to 55°C, and stirring is carried out for 12 h, then the temperature is cooled to room temperature, the solvent is removed by rotary evaporation, sequentially washed with saturated sodium bicarbonate aqueous solution and deionized water, and vacuum dried at 50°C for 10 h to obtain PE-PA compatibilizer;

[0051] Among them, the organic peroxy acid can be selected from one of peroxoacetic acid, peroxybenzoic acid, and m-chloroperoxybenzoic acid; m-chloroperoxybenzoic acid is selected in this embodiment;

[0052] The proton nuclear magnetic resonance spectrum of the PE-PA compatibilizer is as follows: 1H NMR (CDCI3, 400 MHz) δ: 0.81-0.84 (t, 4H), 0.89-1.09 (m, 124H), 1.24-1.60 (m, 126H), 1.85-1.96 (m, 14H), 2.04-2.11 (m, 4H), 3.23-3.29 (m, 4H), 3.72-3.77 (m, 12H), 3.87-3.90 (t, 4H). Example Two:

[0053] A preparation process of a PE-PA composite film I, comprising the following steps:

[0054] Step one, preparing long-chain alkane structured POSS type nylon: through the ring-opening reaction of the epoxy functional group of PE-PA compatibilizer and the terminal amino functional group or terminal carboxyl functional group on the molecular main chain of nylon resin, the chemical bonding treatment of PE-PA compatibilizer to nylon resin is realized, and long-chain alkane structured POSS type nylon is obtained, and the specific preparation steps are as follows: 10 g of nylon resin and 100 mL of N,N-dimethylformamide are added to a three-necked flask, and the temperature is raised to 80°C for stirring until all are dissolved, and then cooled to room temperature; under the condition of nitrogen protection, 10 mL of N,N-dimethylformamide solution containing 2 g of PE-PA compatibilizer is added to the three-necked flask, the temperature is raised to 70°C for stirring for 6 h, the solvent is removed by rotary evaporation, and then vacuum drying at 100°C for 10 h to obtain long-chain alkane structured POSS type nylon;

[0055] Step two, preparing PE-PA alloy master batch: through the physical anchoring effect of long-chain alkane structure in long-chain alkane structured POSS type nylon and the molecular chain of polyethylene resin, long-chain alkane structured POSS type nylon and polyethylene resin are compounded to obtain PE-PA alloy master batch, and the specific preparation steps are as follows: 4 g of low-density polyethylene resin and 6 g of long-chain alkane structured POSS type nylon are uniformly mixed in a high-speed mixer, and then extruded and granulated by a double-screw extruder, and then vacuum dried at 60°C for 10 h to obtain PE-PA alloy master batch;

[0056] Among them, the process parameters of the double-screw extruder are set as follows: the temperatures of 1-6 zones are 200°C, 220°C, 250°C, 255°C, 265°C and 260°C respectively, and the rotating speed is 400 r / min;

[0057] Step three, preparing PE-PA composite film I: according to the formula of PE-PA composite film I, the raw materials of each layer are respectively put into the hoppers of the three single-screw extruders of a three-layer co-extrusion film blowing machine set, the molten resins are converged at the die head by a flow divider, and then extruded, blown and pulled (the blow-up ratio is controlled at 2.7), cooled and wound to obtain a PE-PA composite film I with a thickness of 120 μm;

[0058] The process parameters of the single screw extruder corresponding to the support layer and the heat sealing layer are set as follows: the temperatures of zones 1-3 are 120℃, 150℃ and 170℃ respectively, the flow channel temperature is 165℃, and the rotating speed is 30r / min;

[0059] The process parameters of the single screw extruder corresponding to the functional layer are set as follows: the temperatures of zones 1-3 are 200℃, 230℃ and 270℃ respectively, the flow channel temperature is 260℃, and the rotating speed is 50r / min. Example Three:

[0060] A PE-PA composite film II, the difference between the product structure and the PE-PA composite film I in Example One is only that the formula of the PE-PA alloy master batch is: 40wt% low density polyethylene resin, 55wt% nylon resin and 5wt% PE-PA compatibilizer;

[0061] The preparation process of the PE-PA composite film II is the same as that of the PE-PA composite film II in Example Two. Example Four:

[0062] A PE-PA composite film III, the difference between the product structure and the PE-PA composite film I in Example One is only that the formula of the PE-PA alloy master batch is: 40wt% low density polyethylene resin, 45wt% nylon resin and 15wt% PE-PA compatibilizer;

[0063] The preparation process of the PE-PA composite film III is the same as that of the PE-PA composite film I in Example Two.

[0064] Performance test:

[0065] (1) Barrier property test: use Y110 oxygen transmission tester to test the oxygen barrier property of the sample according to GB / T 1038.1-2022 "Plastic products - Film and sheet - Determination of gas transmission - Part 1: differential pressure method" standard, and record the oxygen transmission amount of the sample; use TC-03 water vapor transmission tester to test the water barrier property of the sample according to GB / T 1037-2021 "Plastic film and sheet - Determination of water vapor transmission - Cup method of weight gain and weight loss", and record the water vapor transmission amount of the sample;

[0066] (2) Mechanical property test: use Instron 5565 universal tensile testing machine to test the tensile property of the sample according to GB / T 1040.3-2006 "Plastics - Determination of tensile properties - Part 3: test conditions for films and sheets" standard (sample along the blown film direction), and record the longitudinal tensile strength of the sample; wherein the sample size is 150mm x 20mm (length x width), and the test speed is 5mm / min;

[0067] (3) Heat sealing performance test: heat sealing experiment was carried out on the sample, the sealing knife area was 15 cm x 1 cm, the heat sealing temperature was 110°C, the heat sealing pressure was 0.2 MPa, and the heat sealing time was 2.0 s;

[0068] According to QB / T 2358-1998 "Plastic Film Packaging Bag Heat Sealing Strength Test Method", the heat sealing performance of the heat sealing sample was tested, the test speed was 300 mm / min, the clamp spacing was 50 mm, and the heat sealing strength of the sample was recorded;

[0069] (4) Hygienic performance test: according to GB / T 5009.60-2003 "Analysis Method for Hygienic Standard of Polyethylene, Polystyrene and Polypropylene Formed Products for Food Packaging", the hygienic performance of the sample was tested, and the physicochemical indexes were tested according to GB / T 5009.58-2003 "Analysis Method for Hygienic Standard of Polyethylene Resin for Food Packaging";

[0070] The above experimental results are shown in Tables 1-2 and Figure 5 ;

[0071] Table 1 Performance test results of PE-PA composite film

[0072]

[0073] Note: The difference between the comparative example and PE-PA composite film I is that nylon / polyethylene blend masterbatch is used instead of PE-PA alloy masterbatch;

[0074] The formula of the nylon / polyethylene blend masterbatch is: 40wt% low density polyethylene resin, 50wt% nylon resin and 10wt% conventional tackifying resin (maleic anhydride grafted polyethylene resin, brand 4288), and the preparation method is: 4g low density polyethylene resin, 5g nylon resin and 1g maleic anhydride grafted polyethylene resin are added to a high-speed mixer and mixed uniformly, then extruded and granulated by a twin-screw extruder, vacuum dried at 60°C for 10h, to obtain the nylon / polyethylene blend masterbatch;

[0075] The process parameters of the twin-screw extruder are set as follows: the temperatures of zones 1-6 are 200°C, 220°C, 250°C, 255°C, 265°C and 260°C respectively, and the rotation speed is 400r / min;

[0076] Table 2 Performance test results of PE-PA composite film

[0077]

[0078] Through comprehensive analysis of the above experimental results, the following conclusions can be drawn:

[0079] (1) The PE-PA composite film prepared from the compatible components independently developed by the application has the beneficial technical effect of significantly improved barrier performance;

[0080] (2) The longitudinal tensile strength of the PE-PA composite film prepared by the application is significantly greater than the technical requirement of the longitudinal tensile strength ≥ 40 MPa in BB / T 0092-2022 "Disposable Liquid Packaging Bag";

[0081] (3) The longitudinal tensile strength of the PE-PA composite film prepared by the application is significantly greater than the technical requirement of the sealing strength ≥ 15 N (material thickness R, 0.08 mm ≤ R < 0.18 mm) in JB / T 9086-2007 "Plastic Bag Hot Press Sealing Machine";

[0082] (4) The sanitary performance of the PE-PA composite film prepared by the application meets the national standard requirements and has practical application value.

Claims

1. A PE-PA based composite film, characterized in that, The composite film is a PE-PA composite film, and the product structure of the PE-PA composite film consists of the following layers arranged sequentially: Support layer: The raw material formula is 100wt% low-density polyethylene resin, and the dosage is 20-30 parts by weight; Functional layer: The raw material formula is 100wt% PE-PA alloy masterbatch, and the dosage is 40-60 parts by weight; Heat-sealing layer: The raw material formula is 100wt% metallocene polyethylene resin, and the dosage is 20-30 parts by weight; The formulation of the PE-PA alloy masterbatch is as follows: 40wt% low-density polyethylene resin, 45-55wt% nylon resin and 5-15wt% PE-PA compatibilizer; The chemical structural formula of the PE-PA compatibilizer is: 。 2. The PE-PA based composite film according to claim 1, characterized in that, The thickness of the PE-PA composite film is 100-150 μm.

3. The manufacturing process for the PE-PA based composite film according to any one of claims 1-2, characterized in that, Includes the following steps: Step 1: Preparation of PE-PA compatibilizer; Step 2: PE-PA compatibilizer-grafted nylon resin is prepared by ring-opening reaction between the epoxy functional groups of the PE-PA compatibilizer and the amino or carboxyl functional groups at the ends of the PA resin molecular chain. PE-PA alloy masterbatch is then prepared by physically anchoring the long-chain alkane structure on the PE-PA compatibilizer-grafted nylon resin to the PE resin molecular chain. Step 3: Prepare the raw materials according to the PE-PA composite film formula. Feed each layer of raw materials into the hoppers of the three single-screw extruders of the three-layer co-extrusion film blow molding unit in sequence. The molten resin is collected at the die head by the distributor, and then extruded, blown, drawn, cooled and wound up through the die head to obtain the PE-PA composite film.

4. The manufacturing process of the PE-PA based composite film according to claim 3, characterized in that, The preparation method of the PE-PA compatibilizer is as follows: A long-chain alkane-structured oleylamine derivative is generated by nucleophilic substitution of the -NH2 functional group of 1 molar equivalent of oleylamine with the chlorine functional group of 0.91-0.95 molar equivalent of 1-chlorooctadecane. The -chloro functional group of 1 molar equivalent of 1,5-dichloropentane undergoes a nucleophilic substitution reaction with the -NH- functional group of 2.01-2.05 molar equivalents of long-chain alkane-structured oleamine derivatives to generate a bis(long-chain alkane-structured oleamine)diamine monomer. Utilizing a nucleophilic substitution reaction mechanism, a quaternization reaction is carried out between the tertiary amine group of a 1 molar equivalent bis(long-chain alkane-structured oleamino) diamine monomer and the chlorine functional group of 2.05-2.09 molar equivalents 3-chloropropylheptaisobutyl POSS, generating a bis(long-chain alkane-structured oleamino) POSS diamine salt. The alkenyl functional group in the bis(long-chain alkane-structured oleylamine)POSS diamine salt molecule is oxidized to an epoxy functional group by organic peroxy acid, thus generating a PE-PA compatibilizer.

5. The manufacturing process of the PE-PA based composite film according to claim 4, characterized in that, The organic peroxyacid is one of peracetic acid, peroxybenzoic acid, and m-chloroperoxybenzoic acid.

6. The manufacturing process of the PE-PA based composite film according to claim 3, characterized in that, The preparation method of the PE-PA alloy masterbatch is as follows: Dissolve 9-11 parts by weight of nylon resin in N,N-dimethylformamide solvent, add 1-3 parts by weight of PE-PA compatibilizer under nitrogen protection, heat to 60-80℃ and stir for 4-8 hours, remove solvent by rotary evaporation, and dry to obtain PE-PA compatibilizer grafted nylon resin, namely long-chain alkane structured POSS type nylon. Four parts by weight of low-density polyethylene resin and six parts by weight of long-chain alkane-structured POSS-type nylon were added to a high-speed mixer and mixed evenly. The mixture was then extruded and granulated using a twin-screw extruder and dried to obtain PE-PA alloy masterbatch.

7. The manufacturing process of the PE-PA based composite film according to claim 6, characterized in that, The temperatures of zones 1-6 of the twin-screw extruder used to prepare PE-PA alloy masterbatch are as follows: 190-210℃, 210-230℃, 240-260℃, 250-260℃, 260-270℃, and 255-265℃, respectively.

8. The manufacturing process of the PE-PA based composite film according to claim 3, characterized in that, The process parameters for the single-screw extruder used to prepare PE-PA composite films are as follows: Functional layer: Zones 1-3 have temperatures of 190-210℃, 220-240℃, and 260-280℃ respectively, while the flow channel temperature is 255-265℃.

9. The manufacturing process of the PE-PA based composite film according to claim 8, characterized in that, The process parameters for the single-screw extruder used to prepare PE-PA composite films are as follows: Support layer: Zones 1-3 have temperatures of 110-130℃, 145-155℃, and 160-175℃ respectively, while the flow channel temperature is 160-170℃; Heat sealing layer: Zones 1-3 have temperatures of 110-130℃, 140-160℃, and 165-180℃ respectively, and the flow channel temperature is 160-170℃.

10. The application of the PE-PA based composite film according to any one of claims 1-2, characterized in that, The PE-PA composite film is used to manufacture BIB bags.

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