A high barrier breathable PE packaging film and its preparation process

Abstract

The present invention relates to the technical field of liquid aromatherapy packaging materials, and discloses a high-barrier breathable PE packaging film and a preparation process, using low-density polyethylene resin and metallocene polyethylene resin as raw materials, polyolefin elastomer as a toughening agent, and surface alkylated calcium carbonate as a porogen, through melt blending, extrusion granulation, blow molding and uniaxial stretching process, a low-temperature heat-sealable microporous breathable PE film is prepared, and the low-temperature heat-sealable microporous breathable PE film pretreated by release coating is composited with a barrier composite film to prepare a high-barrier breathable PE packaging film. The present invention provides a new product solution for the contradictory technical requirements of boxed liquid aromatherapy packaging materials that require both high barrier and breathability. When in use, the outer barrier composite film is uncovered, and the inner low-temperature heat-sealable microporous breathable PE film releases aromatherapy gas molecules. When not in use, the barrier composite film achieves the technical effect of light-shielding and blocking.

Description

Technical Field

[0001] The invention relates to the technical field of liquid aromatherapy packaging materials, in particular to a high-barrier breathable PE packaging film and a preparation process thereof. Background Art

[0002] The packaging material of boxed liquid aromatherapy needs to have two contradictory basic functions of light-proof and breathable. The material can be obtained by composite hot-melt processing of breathable polyethylene film and barrier material. Among them, the breathable polyethylene film has the effect of being breathable and liquid-proof. The inorganic filler polymer stretching technology is currently the most common method for preparing breathable polyethylene film. The process of this method is to first fill the inorganic filler (calcium carbonate, silicon dioxide, titanium dioxide, etc.) with polyethylene resin, and then make it into a film by casting or blow molding. Finally, by applying unidirectional or bidirectional stretching to the film, the polymer matrix and the surface of the inorganic filler particles are separated and interconnected micro-channels are developed between the filler particles, thereby forming a microporous breathable polyethylene film.

[0003] However, polyethylene is a non-polar polymer and the surface polarity of inorganic fillers is relatively strong. The two have poor compatibility when mixed. In addition, the surface energy of inorganic fillers is high and they are very easy to agglomerate. Therefore, the surface of inorganic fillers needs to be modified to improve their interfacial forces and interfacial compatibility. Summary of the invention

[0004] In view of the contradictory technical requirements of boxed liquid aromatherapy packaging materials that require both high barrier and breathability, the present invention provides a high barrier breathable PE packaging film and a preparation process. The product design of the high barrier breathable PE packaging film is a two-layer structure, the outer layer is a barrier composite film, and the inner layer is a low-temperature heat-sealed microporous breathable PE film. The outer layer and the inner layer are compounded by a dry compounding process or a solvent-free compounding process;

[0005] When the boxed liquid aromatherapy is in use, just peel off the outer barrier composite film, and the inner low-temperature heat-sealed microporous breathable PE film can achieve the technical function of being breathable and liquid-proof. When the boxed liquid aromatherapy is not in use, the barrier composite film can achieve the technical function of light-proofing.

[0006] The barrier composite film is made by compounding an outer PET film, an intermediate aluminum foil and an inner PET film through a dry compounding process or a solvent-free compounding process. The peel strength between the layers in the outer barrier composite film is controlled at 2-3N / 15mm.

[0007] Before laminating the low-temperature heat-sealed microporous breathable PE film with the barrier-type composite film, it is necessary to undergo a release pre-coating treatment to prevent the lamination from affecting the peeling performance. The peel strength between the low-temperature heat-sealed microporous breathable PE film and the barrier-type composite film is controlled at 0.1-0.3N / 15mm.

[0008] A high barrier breathable PE packaging film, the product structure of which is a two-layer structure, the outer layer is a barrier composite film with a thickness of 40-60 μm, and the inner layer is a low-temperature heat-sealed microporous breathable PE film with a thickness of 30-50 μm;

[0009] The low-temperature heat-sealed microporous breathable PE film comprises the following raw materials in parts by weight:

[0010] 80-120 parts of low-density polyethylene resin LDPE;

[0011] 5-20 parts of polyolefin elastomer POE;

[0012] 10-30 parts of metallocene polyethylene resin m-LLDPE;

[0013] 30-50 parts of surface alkylated calcium carbonate;

[0014] 5-15 parts of composite additives;

[0015] The preparation method of surface alkylated calcium carbonate is as follows: surface modification treatment of hydroxylated calcium carbonate is performed using an alkyl chain coupling monomer, and a dehydration condensation reaction is carried out between the silanol functional groups obtained by the hydrolysis reaction of the alkyl chain coupling monomer and the hydroxyl functional groups on the surface of the hydroxylated calcium carbonate to obtain the obtained product;

[0016] The alkyl chain type coupling monomer is a monoalkyl chain type coupling monomer or a polyalkyl chain type coupling monomer.

[0017] Preferably, the preparation method of the monoalkyl chain coupling monomer is: an amine-ene addition reaction is carried out between the -NH2 functional group of n-undecylamine and the alkenyl functional group of acryloxymethoxysilane monomer to generate the monoalkyl chain coupling monomer.

[0018] Preferably, the acryloxymethoxysilane monomer is one of 3-acryloxypropyltrimethoxysilane, 3-acryloxypropylmethyldimethoxysilane and (3-acryloxypropyl)dimethylmethoxysilane.

[0019] Preferably, the preparation method of the polyalkyl chain type coupling monomer is: a substitution reaction is carried out between the secondary amine functional group of the monoalkyl chain type coupling monomer and the chlorine functional group of 1-chloroundecane, and the molar ratio of the monoalkyl chain type coupling monomer to 1-chloroundecane is controlled to be 1:(2.1-2.9) to generate a polyalkyl chain type coupling monomer.

[0020] Preferably, the preparation method of the low-temperature heat-sealing microporous breathable PE film is:

[0021] The ingredients are prepared according to the formula of the low-temperature heat-sealed microporous breathable PE film, the formula raw materials are added into a high-speed mixer and mixed evenly, and extruded and granulated by a twin-screw extruder to prepare a microporous breathable PE masterbatch;

[0022] The microporous breathable PE masterbatch was added into a single-screw extruder film blowing machine, and the film was blown into a film by the upward blowing method. Then, the film was fixed on the fixture of an electronic material testing machine for uniaxial stretching to prepare a low-temperature heat-sealed microporous breathable PE film.

[0023] Preferably, the composite auxiliary agent includes 3-8 parts of polyethylene wax, 1-4 parts of zinc stearate and 1-3 parts of antioxidant 1010.

[0024] A preparation process of a high barrier breathable PE packaging film comprises the following steps:

[0025] The outer PET film, the middle aluminum foil and the inner PET film are sequentially bonded together by a high-speed solvent-free laminating machine through a polyurethane adhesive to obtain a barrier composite film;

[0026] A low-temperature heat-sealable microporous breathable PE film is prepared, and a 1-3 wt % silicone release agent solution is evenly coated on the low-temperature heat-sealable microporous breathable PE film using a 5-8 μm coating rod, and the film is baked and dried to obtain a low-temperature heat-sealable microporous breathable PE film pretreated with a release coating;

[0027] A high-barrier breathable PE packaging film is obtained by bonding a low-temperature heat-sealed microporous breathable PE film pretreated by release coating and a barrier composite film together through an adhesive using a high-speed solvent-free laminating machine.

[0028] The method of using the high barrier breathable PE packaging film for packaging liquid aromatherapy is as follows: when the liquid aromatherapy is sealed and not in use, the outer barrier composite film is used to protect the liquid aromatherapy from light and blockage; when in use, the outer barrier composite film is removed, and the aromatherapy gas molecules are released through the inner low-temperature heat-sealed microporous breathable PE film, but the liquid aromatherapy is not penetrated.

[0029] Beneficial effects:

[0030] The present invention designs and synthesizes two alkyl chain coupling monomers (single alkyl chain coupling monomer and multi-alkyl chain coupling monomer), and uses the alkyl chain coupling monomers to perform surface modification treatment on hydroxylated calcium carbonate to prepare surface alkylated calcium carbonate;

[0031] With low-density polyethylene resin LDPE and metallocene polyethylene resin m-LLDPE as raw materials, polyolefin elastomer POE as toughening agent, surface alkylated calcium carbonate as porogen, a low-temperature heat-sealable microporous breathable PE film with excellent air-permeable and liquid-impermeable effect is prepared through melt blending, extrusion granulation, blow molding and uniaxial stretching process, and the low-temperature heat-sealable microporous breathable PE film is subjected to release coating pretreatment with a release agent, and the low-temperature heat-sealable microporous breathable PE film pretreated with release coating and a barrier composite film are bonded together by a high-speed solvent-free laminating machine to prepare a high-barrier breathable PE packaging film, and its oxygen permeability is ≤0.001cm 3 / (m 2 •24h•0.1MPa), water vapor transmission rate ≤0.001g / (m 2 • 24h), when the liquid aromatherapy is sealed and not in use, it can effectively ensure the stability of the liquid aromatherapy material and meet the technical requirements for packaging liquid aromatherapy;

[0032] The experimental results show that the peel strength of the low-temperature heat-sealed microporous breathable PE film and the barrier composite film in the high-barrier breathable PE packaging film prepared by the present invention is in the range of 0.1-0.3N / 15mm. When in use, the outer barrier composite film is relatively easy to peel off and will not stick when peeled off, thereby ensuring that the release of aroma gas molecules will not be affected.

[0033] It is also found that the low-temperature heat-sealed microporous breathable PE film in the high-barrier breathable PE packaging film prepared by the present invention achieves the beneficial technical effect of being breathable and liquid-impermeable. DETAILED DESCRIPTION

[0034] The main raw materials used in the present invention are as follows:

[0035] Polyethylene terephthalate resin PET was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., and its brand number is 555;

[0036] Low-density polyethylene resin LDPE was purchased from Jiangsu Rantai Plastics Co., Ltd., and its brand is LD 150DW;

[0037] Polyolefin elastomer POE was purchased from Dongguan Yingxiang Plastic Raw Materials Co., Ltd., and its brand number is 8411;

[0038] Metallocene polyethylene resin m-LLDPE was purchased from Dongguan Jinshixiang Plastic Raw Materials Co., Ltd., and its brand name is SP4020;

[0039] Calcium carbonate powder was purchased from Suzhou Liangde Innovation Powder Sales Co., Ltd., with a particle size of 10-20 μm;

[0040] The polyurethane adhesive was purchased from Guangdong Xinhui Chemical Co., Ltd., and its product number is XH-9802A;

[0041] The silicone release agent, with a viscosity of 8000-16000cps@25°C, was purchased from Guangzhou Qisheng Trading Co., Ltd. Embodiment 1:

[0042] A high barrier breathable PE packaging film, the product structure of which is a two-layer structure, the outer layer is a barrier composite film, and the inner layer is a low-temperature heat-sealed microporous breathable PE film;

[0043] The high barrier breathable PE packaging film is made by compounding a barrier composite film with a thickness of 50 μm and a low-temperature heat-sealing microporous breathable PE film with a thickness of 40 μm through a high-speed solvent-free compounding process;

[0044] The barrier composite film is made by compounding an outer PET film with a thickness of 25 μm, an intermediate aluminum foil with a thickness of 10 μm and an inner PET film with a thickness of 15 μm through a high-speed solvent-free compounding process.

[0045] The low-temperature heat-sealing microporous breathable PE film comprises the following raw materials in parts by weight:

[0046] 100 parts of low-density polyethylene resin LDPE;

[0047] 10 parts of polyolefin elastomer POE;

[0048] 20 parts of metallocene polyethylene resin m-LLDPE;

[0049] 40 parts of surface alkylated calcium carbonate;

[0050] 5 parts of polyethylene wax;

[0051] 3 parts zinc stearate;

[0052] 2 parts of antioxidant 1010;

[0053] The preparation method of surface alkylated calcium carbonate is as follows: surface modification treatment of hydroxylated calcium carbonate is performed using an alkyl chain coupling monomer, and a dehydration condensation reaction is carried out between the silanol functional groups obtained by the hydrolysis reaction of the alkyl chain coupling monomer and the hydroxyl functional groups on the surface of the hydroxylated calcium carbonate to obtain the obtained product;

[0054] Wherein, the alkyl chain type coupling monomer is a monoalkyl chain type coupling monomer or a polyalkyl chain type coupling monomer;

[0055] The chemical structure and preparation method of the monoalkyl chain coupling monomer are described in Experimental Example 1; the chemical structure and preparation method of the polyalkyl chain coupling monomer are described in Experimental Example 2; and the preparation method of hydroxylated calcium carbonate is described in Experimental Example 3. Embodiment 2:

[0056] A preparation process of a high barrier breathable PE packaging film comprises the following steps:

[0057] Step 1, preparing surface alkylated calcium carbonate: 5 g of hydroxylated calcium carbonate, 80 mL of anhydrous ethanol and 20 mL of deionized water are added to a beaker, ultrasonically treated for 10 min, heated to 40° C., 2 g of an alkyl chain coupling monomer and 2 drops of glacial acetic acid are added to the beaker in sequence, stirred for 10 h, centrifuged, repeatedly centrifuged and washed with anhydrous ethanol and deionized water in sequence, and vacuum dried at 100° C. for 2 h to obtain surface alkylated calcium carbonate;

[0058] Step 2, preparing microporous breathable PE masterbatch: adding 100g of low-density polyethylene resin LDPE, 10g of polyolefin elastomer POE, 20g of metallocene polyethylene resin m-LLDPE, 40g of surface alkylated calcium carbonate prepared in step 1, 5g of polyethylene wax, 3g of zinc stearate and 2g of antioxidant 1010 into a high-speed mixer and mixing evenly, extruding and granulating through a twin-screw extruder, and vacuum drying at 80°C for 6h to obtain microporous breathable PE masterbatch;

[0059] The process parameters of the twin-screw extruder were set as follows: the temperatures of zones 1-6 were 170°C, 180°C, 180°C, 185°C, 190°C, and 195°C, respectively, and the rotation speed was 400 r / min;

[0060] Step 3, preparing a low-temperature heat-sealed microporous breathable PE film: adding the microporous breathable PE masterbatch prepared in step 2 into a single-screw extruder film blowing machine, using an upward blowing method to blow mold the film, and then fixing it on a fixture of an electronic material testing machine for uniaxial stretching to obtain a low-temperature heat-sealed microporous breathable PE film;

[0061] The process parameters of the single-screw extruder film blowing machine are as follows: the temperatures of zones 1-3 are 150°C, 170°C, and 185°C, the rotation speed is 30r / min, the pulling speed is 6m / min, the die diameter of the film blowing machine is 65mm, and the blow-up ratio is 2.5; the process parameters of the electronic material testing machine are as follows: the stretching temperature is 75°C, the stretching ratio is 2.6, the stretching rate is 100mm / min, and the heat setting after stretching is 30 min;

[0062] Step 4, preparing a barrier composite film: using a high-speed solvent-free composite machine to sequentially bond the outer PET film, the middle aluminum foil and the inner PET film together with a polyurethane adhesive to obtain a barrier composite film;

[0063] Among them, the process parameters of the high-speed solvent-free laminating machine are set as follows: laminating speed 400m / min, laminating temperature 45°C, cooling temperature 25°C, laminating pressure 0.5MPa, and gluing pressure 0.5MPa;

[0064] Step 5, preparing a high-barrier breathable PE packaging film: first, pre-treating the low-temperature heat-sealable microporous breathable PE film by release coating, using a 6μm coating rod to evenly coat a 2wt% silicone release agent solution (with n-heptane as solvent) on the low-temperature heat-sealable microporous breathable PE film, and baking at 100°C for 10 minutes; then, using a high-speed solvent-free laminating machine to bond the pre-treated low-temperature heat-sealable microporous breathable PE film and the barrier composite film together by a polyurethane adhesive to obtain a high-barrier breathable PE packaging film;

[0065] Among them, the process parameters of the high-speed solvent-free laminating machine are set as follows: laminating speed 200m / min, laminating temperature 40°C, cooling temperature 25°C, laminating pressure 0.35MPa, and gluing pressure 0.40MPa;

[0066] When the alkyl chain coupling monomer is a monoalkyl chain coupling monomer, a low-temperature heat-sealing microporous breathable PE film I is prepared, and the corresponding film product is recorded as a high-barrier breathable PE packaging film I;

[0067] When the alkyl chain coupling monomer is a polyalkyl chain coupling monomer, a low-temperature heat-sealable microporous breathable PE film II is prepared, and its corresponding film product is recorded as a high-barrier breathable PE packaging film II.

[0068] Comparative Example:

[0069] Prepare a conventional PE packaging film, which differs from a high-barrier breathable PE packaging film only in that the conventional PE film is used to replace the low-temperature heat-sealed microporous breathable PE film;

[0070] Among them, the difference between conventional PE film and low-temperature heat-sealed microporous breathable PE film is that surface alkylated calcium carbonate is not used.

[0071] Performance Testing:

[0072] The performance test of the low temperature heat seal type microporous breathable PE film was carried out, and the results are shown in Table 1;

[0073] Table 1 Performance test results of low temperature heat sealable microporous breathable PE membrane

[0074]

[0075] The experimental method of heat seal strength is as follows: according to QB / T 2358-1998 standard, the heat seal test of the sample is carried out using HSG-C heat sealer, the sealing knife area is 15cm×1cm, the heat seal temperature is 100℃, the heat seal pressure is 0.2MPa, and the heat seal time is 2.0s;

[0076] The experimental method of liquid aromatherapy is as follows: first, seal the test cup with a low-temperature heat-sealed microporous breathable PE film sample, then drop 5 mL of liquid aromatherapy (brand: NOVO) onto the low-temperature heat-sealed microporous breathable PE film sample, let it stand for 24 hours, and observe whether there is liquid aromatherapy in the test cup;

[0077] The experimental method for the permeation of aromatherapy gas molecules is as follows: first, add liquid aromatherapy (brand: NOVO) into the test cup, record the initial height of the liquid aromatherapy in the test cup, and then seal the test cup with a low-temperature heat-sealed microporous breathable PE film sample. After 24 hours, observe whether the height of the liquid aromatherapy in the test cup is lower than the initial height.

[0078] The barrier performance of the high barrier breathable PE packaging film was tested, and the results are shown in Table 2;

[0079] Table 2 Barrier performance test results of high barrier breathable PE packaging film

[0080]

[0081] The peeling performance test was carried out on the barrier composite film and the high barrier breathable PE packaging film, and the results are shown in Table 3;

[0082] Table 3 Peeling performance test results of high barrier breathable PE packaging film

[0083]

[0084] The following conclusions can be drawn from the performance test results:

[0085] First: The oxygen permeability of the high barrier breathable PE packaging film product prepared by the present invention is less than 0.001cm 3 / (m 2 •24h•0.1MPa), water vapor transmission rate ≤0.001g / (m 2 • 24h), when the liquid aromatherapy is sealed and not in use, it can effectively ensure the stability of the liquid aromatherapy material and meet the technical requirements for packaging liquid aromatherapy;

[0086] Second: the peel strength of the low-temperature heat-sealable microporous breathable PE film and the barrier composite film in the high-barrier breathable PE packaging film prepared by the present invention is in the range of 0.1-0.3N / 15mm. When in use, the outer barrier composite film is relatively easy to peel off, and no adhesion occurs when peeling off, thereby ensuring that the release of aroma gas molecules will not be affected;

[0087] Third: The low-temperature heat-seal microporous breathable PE film in the high-barrier breathable PE packaging film prepared by the present invention can achieve the beneficial technical effect of being breathable and liquid-tight, and under the low-temperature heat-sealing condition of 100°C, its sealing strength is greater than the technical requirement of JB / T9086-2007 "Plastic Bag Hot Press Sealing Machine" on sealing strength ≥10N / 15mm (material thickness R, 0.04mm≤R<0.08mm).

[0088] Experimental Example 1:

[0089] Preparation of a monoalkyl chain coupling monomer: generating a monoalkyl chain coupling monomer by an amine-ene addition reaction between the -NH2 functional group of n-undecylamine and the alkenyl functional group of an acryloxymethoxysilane monomer;

[0090] The acryloxymethoxysilane monomer is one of 3-acryloxypropyltrimethoxysilane, 3-acryloxypropylmethyldimethoxysilane and (3-acryloxypropyl)dimethylmethoxysilane. In this experimental example, (3-acryloxypropyl)dimethylmethoxysilane is selected, and the chemical structure of the prepared monoalkyl chain coupling monomer is:

[0091] ;

[0092] The specific experimental steps for preparing the monoalkyl chain coupling monomer are as follows: 1.7 g of n-undecylamine and 30 mL of N,N-dimethylformamide are added to a three-necked flask, stirred at room temperature until completely dissolved, then 2.2 mL of (3-acryloxypropyl)dimethylmethoxysilane is slowly added dropwise to the three-necked flask, stirred and mixed at room temperature for 30 min, heated to 40° C. and stirred for 6 h, cooled to room temperature, rotary evaporated to remove the solvent, and vacuum dried to obtain the monoalkyl chain coupling monomer;

[0093] The nuclear magnetic resonance hydrogen spectrum of the monoalkyl chain coupling monomer is characterized as follows: 1 H NMR (DMSO-d6, 400MHz) δ: 0.05 (s, 6H), 0.87-0.92 (m, 5H), 1.26-1.43 (m, 16H), 1.64-1.75 (m, 4H), 2.50-2.53 (t, 2H) ), 2.76-2.81(m, 2H), 2.93-2.98(m, 2H), 3.30-3.36(m, 1H), 3.48(s, 3H), 4.00-4.04(t, 2H).

[0094] Experimental Example 2:

[0095] Preparation of polyalkyl chain coupling monomer: a polyalkyl chain coupling monomer is generated by a substitution reaction between the secondary amine functional group of the monoalkyl chain coupling monomer and the chlorine functional group of 1-chloroundecane, and the molar ratio of the monoalkyl chain coupling monomer to 1-chloroundecane is controlled to be 1:2.5, and the chemical structure thereof is:

[0096] ;

[0097] The specific experimental steps for preparing the polyalkyl chain coupling monomer are as follows: under the protection of nitrogen, 1.9 g of the monoalkyl chain coupling monomer and 30 mL of N,N-dimethylformamide are added to a three-necked flask, stirred at room temperature until completely dissolved, then 2.7 mL of 1-chloroundecane is added dropwise to the three-necked flask, the temperature is raised to 50° C., stirred for reaction for 12 h, cooled to room temperature, the solvent is removed by rotary evaporation, and vacuum dried to obtain the polyalkyl chain coupling monomer;

[0098] The nuclear magnetic resonance hydrogen spectrum of the polyalkyl chain coupling monomer is characterized as follows: 1 H NMR (DMSO-d6, 400MHz) δ: 0.03 (s, 6H), 0.87-0.92 (m, 11H), 1.24-1.37 (m, 48H), 1.56-1.64 (m, 6H), 1.68-1.76 (m, 2H ), 2.78-2.82(t, 2H), 3.39(s, 3H), 3.58-3.61(t, 6H), 3.76-3.80(t, 2H), 4.02-4.06(t, 2H).

[0099] Experimental Example 3:

[0100] Preparation of hydroxylated calcium carbonate: 10 g of calcium carbonate powder and 200 mL of aqueous hydrogen peroxide solution (30 wt%) were added to a round-bottom flask, and the mixture was evenly dispersed by ultrasonication for 10 min. Under mechanical stirring, the mixture was heated to 105 °C and refluxed for 6 h. After cooling, the mixture was centrifuged at 5000 rpm for 5 min, washed three times with deionized water, and dried under vacuum to obtain hydroxylated calcium carbonate.

Claims

1. A high barrier breathable PE packaging film, characterized in that: The product structure of the high barrier breathable PE packaging film is a two-layer structure, the outer layer is a barrier composite film with a thickness of 40-60 μm, and the inner layer is a low-temperature heat-sealed microporous breathable PE film with a thickness of 30-50 μm; The low-temperature heat-sealed microporous breathable PE film comprises the following raw materials in parts by weight: 80-120 parts of low-density polyethylene resin LDPE; 5-20 parts of polyolefin elastomer POE; 10-30 parts of metallocene polyethylene resin m-LLDPE; 30-50 parts of surface alkylated calcium carbonate; 5-15 parts of composite additives; The preparation method of surface alkylated calcium carbonate is as follows: surface modification treatment of hydroxylated calcium carbonate is performed using an alkyl chain coupling monomer, and a dehydration condensation reaction is carried out between the silanol functional groups obtained by the hydrolysis reaction of the alkyl chain coupling monomer and the hydroxyl functional groups on the surface of the hydroxylated calcium carbonate to obtain the obtained product; Wherein, the alkyl chain type coupling monomer is a monoalkyl chain type coupling monomer or a polyalkyl chain type coupling monomer; The preparation method of the monoalkyl chain coupling monomer is as follows: an amine-ene addition reaction is carried out between the -NH2 functional group of n-undecylamine and the alkenyl functional group of (3-acryloxypropyl)dimethylmethoxysilane to generate the monoalkyl chain coupling monomer; The preparation method of the polyalkyl chain coupling monomer comprises: a substitution reaction is carried out between the secondary amine functional group of the monoalkyl chain coupling monomer and the chlorine functional group of 1-chloroundecane, and the molar ratio of the monoalkyl chain coupling monomer to 1-chloroundecane is controlled to be 1:(2.1-2.9) to generate the polyalkyl chain coupling monomer.

2. A high barrier breathable PE packaging film according to claim 1, characterized in that: The preparation method of the low-temperature heat-sealing microporous breathable PE film is as follows: According to the formula of low-temperature heat-sealed microporous breathable PE film, the ingredients are prepared, the formula raw materials are added into a high-speed mixer and mixed evenly, and extruded and granulated by a twin-screw extruder to prepare microporous breathable PE masterbatch; The microporous breathable PE masterbatch was added into a single-screw extruder film blowing machine, and the film was blown into a film by the upward blowing method. Then, the film was fixed on the fixture of an electronic material testing machine for uniaxial stretching to prepare a low-temperature heat-sealed microporous breathable PE film.

3. A high barrier breathable PE packaging film according to claim 1, characterized in that: The composite auxiliary agent includes 3-8 parts of polyethylene wax, 1-4 parts of zinc stearate and 1-3 parts of antioxidant 1010.

4. A process for preparing a high barrier breathable PE packaging film according to any one of claims 1 to 3, characterized in that: The following steps are involved: The outer PET film, the middle aluminum foil and the inner PET film are sequentially bonded together by an adhesive using a high-speed solvent-free laminating machine to obtain a barrier composite film; A low-temperature heat-sealable microporous breathable PE film is prepared, and a 1-3 wt % silicone release agent solution is evenly coated on the low-temperature heat-sealable microporous breathable PE film using a 5-8 μm coating rod, and the film is baked and dried to obtain a low-temperature heat-sealable microporous breathable PE film pretreated with a release coating; A high-barrier breathable PE packaging film is obtained by bonding a low-temperature heat-sealed microporous breathable PE film pretreated by release coating and a barrier composite film together through an adhesive using a high-speed solvent-free laminating machine.

5. The use of a high barrier breathable PE packaging film according to any one of claims 1 to 3, characterized in that: The method of using the high barrier breathable PE packaging film for packaging liquid aromatherapy is as follows: When the liquid aroma is sealed and not in use, the outer barrier composite film is used to protect the liquid aroma from light and block it. When in use, the outer barrier composite film is removed and the aroma gas molecules are released through the inner low-temperature heat-sealed microporous breathable PE film, but the liquid aroma is not penetrated.

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