PE-PA-based composite film, manufacturing process and application in BIB liquid packaging

Abstract

The invention relates to the technical field of research and development of BIB liquid packaging materials, and discloses a PE-PA-based composite film, a manufacturing process and an application in BIB liquid packaging, and specifically comprises the following steps: synthesizing a PE-PA compatilizer; the preparation method comprises the following steps: carrying out ring-opening reaction on an epoxy functional group of a PE-PA compatilizer and an amino functional group or a carboxyl functional group at a PA resin molecular chain end to prepare PE-PA compatilizer grafted nylon resin, and carrying out physical anchoring action on a long-chain alkane structure on the PE-PA compatilizer grafted nylon resin and a PE resin molecular chain to prepare the PE-PA alloy master batch; low-density polyethylene resin is used as a raw material of a supporting layer, PE-PA alloy master batch is used as a raw material of a functional layer, metallocene polyethylene resin is used as a raw material of a heat sealing layer, a three-layer co-extrusion blow molding film forming technology is adopted, the PE-PA composite film is prepared, and the film product is excellent in comprehensive performance and can be used for manufacturing a BIB bag body.

Description

Technical Field

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

[0002] Driven by consumer demand for beverage packaging, a new type of beverage packaging has emerged - 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 make the bag body must meet the following key performance requirements: extremely high barrier properties, 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 preventing air from being sucked back 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, water barrier, flexibility and safety of PE. Therefore, the PA-PE composite film can meet the core performance requirements of flexible soft packaging materials used in BIB bag manufacturing.

[0004] However, due to the significant differences between PE and PA in terms of molecular polarity, chain structure and viscoelasticity ratio, the two are thermodynamically incompatible systems. Therefore, the modern packaging industry usually uses multifunctional adhesive resins combined with multi-layer co-extrusion technology to overcome the problems of interfacial delamination and barrier failure between the two.

[0005] The study 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 relative size and stabilizing the phase morphology.

[0006] Based on this, the present invention intends to develop a new compatibilizer for improving the interface effect between PE and PA, and thereby compound PE and PA into a new alloy material for manufacturing BIB bags. Summary of the Invention

[0007] The present invention develops and prepares a PE-PA compatibilizer, which improves the compatibility of PE and PA by physically anchoring the PE phase, chemically bonding the PA phase, and synergistically strengthening the PE-PA interface through a rigid organic-inorganic hybrid POSS material. The prepared PE-PA alloy material has balanced and stable performance. Based on this, a PE-PA composite film is provided. The film has very excellent barrier and mechanical properties, and its hygienic properties meet national standards. The film can be used as an inner layer flexible packaging bag material in the field of BIB liquid packaging.

[0008] A composite film based on PE-PA, wherein the composite film is a PE-PA composite film, and the product structure of the PE-PA composite film is the following layers arranged in sequence: Support layer: The raw material formula is 100wt% low-density polyethylene resin, the dosage is 20-30 parts by weight; Functional layer: The raw material formula is 100wt% PE-PA alloy masterbatch, the dosage is 40-60 parts by weight; Heat seal layer: The raw material formula is 100wt% metallocene polyethylene resin, the dosage is 20-30 parts by weight; The formula of PE-PA alloy masterbatch is: 40wt% low-density polyethylene resin, 45-55wt% nylon resin and 5-15wt% PE-PA compatibilizer; Preferably, the thickness of the PE-PA composite film is 100-150 μm.

[0009] The manufacturing process of the PE-PA based composite film includes the following steps: Step 1: Preparation of PE-PA compatibilizer; Step 2: The epoxy functional group of the PE-PA compatibilizer undergoes a ring-opening reaction with the amino functional group or carboxyl functional group at the end of the PA resin molecular chain to obtain a PE-PA compatibilizer-grafted nylon resin, and the long-chain alkane structure on the PE-PA compatibilizer-grafted nylon resin undergoes a physical anchoring effect with the PE resin molecular chain to obtain a PE-PA alloy masterbatch; Step 3: Prepare the ingredients according to the formula of PE-PA composite film, and put the raw materials of each layer into the hoppers of three single-screw extruders of the three-layer co-extrusion film blowing unit in turn. The molten resin is merged at the head of the die through the diverter, extruded, blown, pulled, cooled and wound through the die to produce PE-PA composite film.

[0010] Preferably, the preparation method of the PE-PA compatibilizer is: A long-chain alkane-structured oleylamine derivative is generated by a nucleophilic substitution reaction between the -NH2 functional group of 1 molar equivalent of oleylamine and the chlorine functional group of 0.91-0.95 molar equivalent of 1-chlorooctadecane; A bis(long-chain alkane structured oleylamine)diamine monomer is generated by a nucleophilic substitution reaction between the -chlorine functional group of 1 molar equivalent of 1,5-dichloropentane and the -NH- functional group of 2.01-2.05 molar equivalents of a long-chain alkane structured oleylamine derivative; Utilizing a nucleophilic substitution reaction mechanism, a quaternization reaction occurs between the tertiary amine group of one molar equivalent of a bis(long-chain alkane structured oleylamine)diamine monomer and the chlorine functional group of 2.05-2.09 molar equivalents of 3-chloropropylheptaisobutyl POSS to generate a bis(long-chain alkane structured oleylamine)POSS-based diamine salt. The olefinic functional groups in the molecular structure of the bis(long-chain alkane structured oleylamine) POSS-based diamine salt are oxidized into epoxy functional groups by organic peracid to generate a PE-PA compatibilizer.

[0011] Preferably, the organic peroxyacid is one of peracetic acid, perbenzoic acid, and m-chloroperbenzoic acid.

[0012] Preferably, the preparation method of the PE-PA alloy masterbatch is: 9-11 parts by weight of nylon resin are dissolved in N,N-dimethylformamide solvent, 1-3 parts by weight of PE-PA compatibilizer are added under nitrogen protection, the temperature is raised to 60-80° C. and stirred for reaction for 4-8 hours, the solvent is removed by rotary evaporation, and the PE-PA compatibilizer-grafted nylon resin is obtained after drying, i.e., long-chain alkane structured POSS type nylon; 4 parts by weight of low-density polyethylene resin and 6 parts by weight of long-chain alkane structured POSS nylon were added into a high-speed mixer and mixed evenly, extruded into granules through a twin-screw extruder, and dried to obtain PE-PA alloy masterbatch.

[0013] Preferably, the temperatures of zones 1-6 of the twin-screw extruder used to prepare the PE-PA alloy masterbatch are: 190-210°C, 210-230°C, 240-260°C, 250-260°C, 260-270°C, and 255-265°C, respectively.

[0014] Preferably, the process parameters of the single screw extruder used to prepare the PE-PA composite film are: Functional layer: The temperatures of zones 1-3 are 190-210°C, 220-240°C, and 260-280°C respectively, and the flow channel temperature is 255-265°C.

[0015] Support layer: The temperatures of zones 1-3 are 110-130°C, 145-155°C, and 160-175°C respectively, and the flow channel temperature is 160-170°C; Heat sealing layer: The temperatures of zones 1-3 are 110-130°C, 140-160°C, and 165-180°C respectively, and the flow channel temperature is 160-170°C.

[0016] Beneficial effects: The present invention first introduces a long-chain alkane structure by a nucleophilic substitution reaction between oleylamine and 1-chlorooctadecane, then expands the oleylamine and long-chain alkane structure using 1,5-dichloropentane as a molecular extension framework, then introduces a rigid organic-inorganic hybrid POSS group by a quaternization reaction, and finally epoxidizes the alkenyl functional group of oleylamine to prepare a PE-PA compatibilizer. The PE-PA compatibilizer achieves a chemical bonding effect through a ring-opening reaction between the epoxy functional group and the amino functional group or carboxyl functional group at the end of the PA molecular chain. Then, due to the high similarity between the chemical structure of the long-chain alkane structure and the PE molecular chain, the long-chain alkane structure penetrates and diffuses into the amorphous region of PE through thermal motion in the molten state, and entangles and tightly combines with the PE molecular chain to achieve a physical anchoring effect, thereby producing a PE-PA alloy material, and a PE-PA alloy masterbatch is produced from the PE-PA alloy material; PE-PA composite film is prepared by using low-density polyethylene resin as the support layer raw material, PE-PA alloy masterbatch as the functional raw material, and metallocene polyethylene resin as the heat-sealing layer raw material through a three-layer co-extrusion blow molding process. This film product has excellent comprehensive performance and can be used to manufacture BIB bags. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the chemical structural formula of the long-chain alkane structured oleylamine derivative; Figure 2 The chemical structure of a bis(long-chain alkane structured oleylamine)diamine monomer; Figure 3 The chemical structural formula is bis(long-chain alkane structured oleylamine) POSS-based diamine salt; Figure 4 is the chemical structure formula of PE-PA compatibilizer; Figure 5 These are the performance test results of PE-PA composite film. DETAILED DESCRIPTION Example 1:

[0018] A PE-PA composite film I, the product structure of which is: The first layer is a support layer made of 100 wt% low-density polyethylene resin (brand LD 150DW), with an amount of 25 parts by weight; The second layer: a functional layer made of 100wt% PE-PA alloy masterbatch, with an amount of 50 parts by weight; The third layer: a heat seal layer made of 100 wt% metallocene polyethylene resin (brand name SP4020), with an amount of 25 parts by weight; The formula of PE-PA alloy masterbatch is: 40wt% low-density polyethylene resin, 50wt% nylon resin (brand FG170) and 10wt% PE-PA compatibilizer; The synthesis process of PE-PA compatibilizer is as follows: Process 1: Preparation of long-chain alkane structured oleylamine derivatives: Nucleophilic substitution reaction of the -NH2 functional group of 1 molar equivalent of oleylamine with the chlorine functional group of 0.93 molar equivalent of 1-chlorooctadecane to generate long-chain alkane structured oleylamine derivatives, the chemical structure of which is as follows: Figure 1 As shown, the specific preparation steps are as follows: 5.4 g of oleylamine and 50 mL of N,N-dimethylformamide are added to a three-necked flask, stirred at room temperature until completely dissolved, then 50 mL of N,N-dimethylformamide solution containing 5.6 g of 1-chlorooctadecane and 5.6 mL of triethylamine are added to the three-necked flask in sequence, the temperature is raised to 70° C., stirred for reaction for 6 hours, cooled to room temperature, and the solvent is removed by rotary evaporation. The product is washed with deionized water and dried in vacuo at 50° C. for 8 hours to obtain a long-chain alkane structured oleylamine derivative. Process 2, preparation of bis(long-chain alkane structured oleylamine)diamine monomer: a nucleophilic substitution reaction is carried out between the chlorine functional group of 1 molar equivalent of 1,5-dichloropentane and the -NH- functional group of 2.03 molar equivalents of long-chain alkane structured oleylamine derivative to generate a bis(long-chain alkane structured oleylamine)diamine monomer, the chemical structure of which is as follows: Figure 2 As shown, the specific preparation steps are as follows: 5.2 g of a 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 an N,N-dimethylformamide solution containing 0.7 g of 1,5-dichloropentane and 3.7 mL of triethylamine are added to the three-necked flask in sequence, the temperature is raised to 70° C., stirred for reaction for 8 h, cooled to room temperature, and the solvent is removed by rotary evaporation. The mixture is washed with deionized water and dried in vacuo at 50° C. for 8 h to obtain a bis(long-chain alkane structured oleylamine)diamine monomer. Process 3, preparation of bis(long-chain alkane structured oleylamine) POSS-based diamine salt: using the nucleophilic substitution reaction mechanism, the tertiary amine group of 1 molar equivalent of bis(long-chain alkane structured oleylamine) diamine monomer and the chlorine functional group of 2.05 molar equivalents of 3-chloropropyl heptaisobutyl POSS (CAS No. 480438-84-4) undergo quaternization reaction to generate bis(long-chain alkane structured oleylamine) POSS-based diamine salt, whose chemical structure is as follows: Figure 3As shown, the specific preparation steps are as follows: 2.7 g of bis(long-chain alkane structured oleylamine)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 dissolved with 4.4 g of 3-chloropropyl heptaisobutyl POSS is added to the three-necked flask, the temperature is raised to 75° C. and stirred for reaction for 5 h, cooled to room temperature, the solvent is removed by rotary evaporation, and vacuum dried at 50° C. for 12 h to obtain bis(long-chain alkane structured oleylamine)POSS-based diamine salt; Process 4, preparation of PE-PA compatibilizer: Under the oxidative action of organic peroxy acid, the olefinic functional group of the bis(long-chain alkane structured oleylamine) POSS-based diamine salt undergoes epoxidation reaction to generate a PE-PA compatibilizer, the chemical structure of which is as follows: Figure 4 As shown, the specific preparation steps are as follows: 3.0 g of bis(long-chain alkane structured oleylamine) 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 dissolved with 1.5 g of m-chloroperbenzoic acid is added to the three-necked flask, the temperature is raised to 55 ° C, stirred for 12 h, cooled to room temperature, and the solvent is removed by rotary evaporation. The mixture is washed with saturated sodium bicarbonate aqueous solution and deionized water in sequence, and vacuum dried at 50 ° C for 10 h to obtain a PE-PA compatibilizer; Among them, the organic peroxy acid can be selected from one of peracetic acid, perbenzoic acid, and meta-chloroperbenzoic acid; in this embodiment, meta-chloroperbenzoic acid is selected; The nuclear magnetic resonance hydrogen spectrum of PE-PA compatibilizer is characterized as follows: 1 H NMR (CDCl3, 400MHz) δ: 0.81-0.84(t, 4H), 0.89-1.09(m, 124H), 1.24-1.60(m, 126H), 1.85-1.96(m, 14 H), 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 2:

[0019] A preparation process of a PE-PA composite film I comprises the following steps: Step 1, preparing long-chain alkane structured POSS type nylon: through the epoxy functional group of the PE-PA compatibilizer and the terminal amino functional group or the terminal carboxyl functional group on the main chain of the nylon resin, a ring-opening reaction occurs, thereby achieving chemical bonding treatment of the PE-PA compatibilizer to the nylon resin to obtain a long-chain alkane structured POSS type nylon, and its specific preparation steps are: 10g nylon resin and 100mL N, N-dimethylformamide are added to a three-necked flask, heated to 80°C and stirred until completely dissolved, cooled to room temperature, and under nitrogen protection, 10mL of N, N-dimethylformamide solution dissolved with 2g PE-PA compatibilizer is added to the three-necked flask, heated to 70°C and stirred for 6h, the solvent is removed by rotary evaporation, and vacuum dried at 100°C for 10h to obtain a long-chain alkane structured POSS type nylon; Step 2, preparing PE-PA alloy masterbatch: through the physical anchoring effect of the long-chain alkane structure in the long-chain alkane structured POSS type nylon and the molecular chain of the polyethylene resin, the long-chain alkane structured POSS type nylon and the polyethylene resin are compounded to obtain a PE-PA alloy masterbatch, and the specific preparation steps are: 4g of low-density polyethylene resin and 6g of long-chain alkane structured POSS type nylon are added to a high-speed mixer and mixed evenly, extruded and granulated by a twin-screw extruder, and vacuum dried at 60°C for 10h to prepare a PE-PA alloy masterbatch; The process parameters of the twin-screw extruder were set as follows: the temperatures of zones 1-6 were 200°C, 220°C, 250°C, 255°C, 265°C, and 260°C, respectively, and the rotation speed was 400 r / min; Step 3, preparing PE-PA composite film I: according to the formula of PE-PA composite film I, the ingredients are prepared, and the raw materials of each layer are respectively put into the hoppers of three single-screw extruders of the three-layer co-extrusion film blow molding unit. The molten resin is merged at the head of the die through a splitter, extruded through the die head, blown and pulled (the blow-up ratio is controlled at 2.7), cooled and wound to prepare a PE-PA composite film I with a thickness of 120 μm; 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°C, 150°C, and 170°C, respectively; the flow channel temperature is 165°C; and the rotation speed is 30 r / min. The process parameters of the single-screw extruder corresponding to the functional layer were set as follows: the temperatures of zones 1-3 were 200°C, 230°C, and 270°C, respectively; the flow channel temperature was 260°C; and the rotation speed was 50 r / min. Example 3:

[0020] A PE-PA composite film II, the product structure of which differs from the PE-PA composite film I in Example 1 only in that the formula of the PE-PA alloy masterbatch is: 40wt% low-density polyethylene resin, 55wt% nylon resin and 5wt% PE-PA compatibilizer; The preparation process of the PE-PA composite film II is the same as that of the PE-PA composite film II in Example 2. Example 4:

[0021] A PE-PA composite film III, the product structure of which differs from the PE-PA composite film I in Example 1 only in that the formula of the PE-PA alloy masterbatch is: 40wt% low-density polyethylene resin, 45wt% nylon resin and 15wt% PE-PA compatibilizer; The preparation process of the PE-PA composite film III is the same as the preparation process of the PE-PA composite film I in Example 2. Performance Testing

[0022] (1) Barrier performance test: Use the Y110 oxygen permeability tester to test the oxygen barrier performance of the sample in accordance with the standard GB / T 1038.1-2022 "Plastic film and sheeting - Gas permeability test method Part 1: Differential pressure method" and record the oxygen permeability of the sample; use the TC-03 water vapor permeability tester to test the water barrier performance of the sample in accordance with the standard GB / T 1037-2021 "Plastic film and sheeting - Determination of water vapor permeability - Cup weight gain and weight loss method" and record the water vapor permeability of the sample; (2) Mechanical properties test: The tensile properties of the samples were tested using an Instron 5565 universal tensile testing machine in accordance with the standard GB / T 1040.3-2006 “Determination of tensile properties of plastics Part 3: Test conditions for film and sheeting” (sampling was performed along the film blowing direction), and the longitudinal tensile strength of the samples was recorded; the sample size was 150 mm × 20 mm (length × width), and the test speed was 5 mm / min; (3) Heat sealing performance test: The sample was subjected to heat sealing test, with a sealing knife area of ​​15 cm × 1 cm, a heat sealing temperature of 110 °C, a heat sealing pressure of 0.2 MPa, and a heat sealing time of 2.0 s; The heat seal performance of the heat-sealed samples was tested according to QB / T 2358-1998 "Test Method for Heat Seal Strength of Plastic Film Packaging Bags" at a test speed of 300 mm / min and a clamp spacing of 50 mm. The heat seal strength of the samples was recorded. (4) Hygienic performance test: The hygienic performance of the samples was tested in accordance with GB / T 5009.60-2003 "Analytical method for hygienic standards of polyethylene, polystyrene and polypropylene moldings for food packaging". The physical and chemical indicators of the experimental results were based on GB / T 5009.58-2003 "Analytical method for hygienic standards of polyethylene resins for food packaging". The above experimental results are shown in Tables 1-2 and Figure 5 ; Table 1 Performance test results of PE-PA composite film

[0023] 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; 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). The preparation method is as follows: 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, extruded into pellets through a twin-screw extruder, and vacuum-dried at 60°C for 10h to prepare the nylon / polyethylene blend masterbatch; The process parameters of the twin-screw extruder were set as follows: the temperatures of zones 1-6 were 200°C, 220°C, 250°C, 255°C, 265°C, and 260°C, respectively, and the rotation speed was 400 r / min; Table 2 Performance test results of PE-PA composite film II

[0024] By comprehensively analyzing the above experimental results, the following conclusions can be drawn: (1) The PE-PA composite film prepared by the present invention using independently developed compatible components has achieved a significant improvement in barrier properties; (2) The longitudinal tensile strength of the PE-PA composite film prepared by the present invention is significantly greater than the technical requirement of BB / T 0092-2022 "Disposable Liquid Container Bags" for longitudinal tensile strength ≥40 MPa; (3) The longitudinal tensile strength of the PE-PA composite film prepared by the present invention is significantly greater than the technical requirement of JB / T 9086-2007 "Plastic Bag Hot Press Sealing Machine" regarding sealing strength ≥ 15N (material thickness R, 0.08mm≤R<0.18mm); (4) The sanitary properties of the PE-PA composite film prepared by the present invention meet the requirements of national standards and have practical application value.

Claims

1. A composite film based on PE-PA, characterized in that: The composite film is a PE-PA composite film, and the product structure of the PE-PA composite film is the following layers arranged in sequence: Support layer: The raw material formula is 100wt% low-density polyethylene resin, the dosage is 20-30 parts by weight; Functional layer: The raw material formula is 100wt% PE-PA alloy masterbatch, the dosage is 40-60 parts by weight; Heat seal layer: The raw material formula is 100wt% metallocene polyethylene resin, the dosage is 20-30 parts by weight; The formula of PE-PA alloy masterbatch is: 40wt% low-density polyethylene resin, 45-55wt% nylon resin and 5-15wt% PE-PA compatibilizer; The chemical structure of 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 of the PE-PA based composite film according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: Preparation of PE-PA compatibilizer; Step 2: The epoxy functional group of the PE-PA compatibilizer undergoes a ring-opening reaction with the amino functional group or carboxyl functional group at the end of the PA resin molecular chain to obtain a PE-PA compatibilizer-grafted nylon resin, and the long-chain alkane structure on the PE-PA compatibilizer-grafted nylon resin undergoes a physical anchoring effect with the PE resin molecular chain to obtain a PE-PA alloy masterbatch; Step 3: Prepare the ingredients according to the formula of PE-PA composite film, and put the raw materials of each layer into the hoppers of three single-screw extruders of the three-layer co-extrusion film blowing unit in turn. The molten resin is merged at the head of the die through the diverter, extruded, blown, pulled, cooled and wound through the die to produce 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: A long-chain alkane-structured oleylamine derivative is generated by a nucleophilic substitution reaction between the -NH2 functional group of 1 molar equivalent of oleylamine and the chlorine functional group of 0.91-0.95 molar equivalent of 1-chlorooctadecane; A bis(long-chain alkane structured oleylamine)diamine monomer is generated by a nucleophilic substitution reaction between the -chlorine functional group of 1 molar equivalent of 1,5-dichloropentane and the -NH- functional group of 2.01-2.05 molar equivalents of a long-chain alkane structured oleylamine derivative; Utilizing a nucleophilic substitution reaction mechanism, a quaternization reaction occurs between the tertiary amine group of one molar equivalent of a bis(long-chain alkane structured oleylamine)diamine monomer and the chlorine functional group of 2.05-2.09 molar equivalents of 3-chloropropylheptaisobutyl POSS to generate a bis(long-chain alkane structured oleylamine)POSS-based diamine salt. The olefinic functional groups in the molecular structure of the bis(long-chain alkane structured oleylamine) POSS-based diamine salt are oxidized into epoxy functional groups by organic peracid to generate a PE-PA compatibilizer.

5. The manufacturing process of the PE-PA based composite film according to claim 4, characterized in that: The organic peroxy acid is one of peracetic acid, perbenzoic acid and m-chloroperbenzoic 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: 9-11 parts by weight of nylon resin are dissolved in N,N-dimethylformamide solvent, 1-3 parts by weight of PE-PA compatibilizer are added under nitrogen protection, the temperature is raised to 60-80° C. and stirred for reaction for 4-8 hours, the solvent is removed by rotary evaporation, and the PE-PA compatibilizer-grafted nylon resin is obtained after drying, i.e., long-chain alkane structured POSS type nylon; 4 parts by weight of low-density polyethylene resin and 6 parts by weight of long-chain alkane structured POSS nylon were added into a high-speed mixer and mixed evenly, extruded into granules through 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: 190-210°C, 210-230°C, 240-260°C, 250-260°C, 260-270°C, and 255-265°C, respectively.

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

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

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

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