Ultralow-temperature recyclable liquid washing small package film and preparation process thereof

Abstract

The application belongs to the technical field of packaging film, and particularly relates to an ultralow-temperature recyclable liquid washing small packaging film and a preparation process thereof. The application comprises an MDOPE layer, a VMPE layer and a PE layer connected in sequence, the VMPE layer is composed of a first corona layer, a first intermediate layer and an inner layer connected in sequence, the PE layer is composed of a second corona layer, a second intermediate layer and a heat sealing layer connected in sequence, the first corona layer is connected with the MDOPE layer after an aluminizing process, and the inner layer is connected with the second corona layer. The liquid washing small packaging film has high barrier property, can reduce the loss of moisture of the liquid washing small packaging, the material from the outer layer to the intermediate layer to the inner layer is PE material, the whole film is composed of single PE material, can be recycled for further processing and utilization after use, and greatly reduces the pollution to the environment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of packaging film, and particularly relates to a super-low-temperature recyclable liquid washing small packaging film and a preparation process thereof. BACKGROUND

[0002] In recent years, with the continuous rapid development of the plastic industry, plastic packaging has been widely used. Since the 1970s, plastic packaging materials have greatly facilitated people's lives due to their light weight, high strength, convenience and low cost. However, most plastic packaging materials cannot be naturally degraded, and their packaging waste will form permanent garbage, causing serious pollution to the environment.

[0003] It has been proven that modern society cannot do without plastic. It is better to use materials with better performance-price ratio and use technologies and methods that are more in line with the characteristics of the times to develop degradable plastics and increase the recycling of plastic waste.

[0004] The main packaging materials for liquid washing small packaging on the market are PET / PE / VMPET / PE, PET / VMPET / PE, and PET / PE. The disadvantages are that the moisture resistance is not high, most of the materials are composite materials of polyester and polyolefin, and the film after use is difficult to continue to be recycled and utilized, and the discarded composite film will pollute the environment; and the outer layer uses PET polyester material with a melting point of 245 degrees or above, and the inner layer uses polyethylene resin with a high sealing temperature (above 115 degrees), so the sealing temperature is higher and cannot meet the requirements of high-speed packaging. SUMMARY

[0005] In order to overcome the defects in the prior art, the present application provides a super-low-temperature recyclable liquid washing small packaging film and a preparation process thereof. The packaging film has high moisture resistance, can be heat sealed at low temperature, and the material is single and recyclable.

[0006] To achieve one of the above purposes, the present application adopts the following technical solutions:

[0007] A super-low-temperature recyclable liquid washing small packaging film, which comprises an MDOPE layer, a high-barrier VMPE layer and a super-low-temperature PE layer connected in sequence, the high-barrier VMPE layer is composed of a first corona layer, a first intermediate layer and an inner layer connected in sequence; the super-low-temperature PE layer is composed of a second corona layer, a second intermediate layer and a heat sealing layer connected in sequence; the first corona layer is connected with the MDOPE layer after an aluminizing process, and the inner layer is connected with the second corona layer.

[0008] Preferably, the first corona layer comprises 65-75 parts by mass of the first metallocene polyethylene, 10-20 parts by mass of the EAA (ethylene acrylic acid copolymer) and 10-20 parts by mass of the low density polyethylene; the first intermediate layer comprises 65-75 parts by mass of the first high density polyethylene and 25-35 parts by mass of the low density polyethylene; the inner layer comprises 65-75 parts by mass of the second high density polyethylene, 15-25 parts by mass of the metallocene linear low density polyethylene and 5-15 parts by mass of the low density polyethylene; the second corona layer comprises 70-80 parts by mass of the linear polyethylene and 20-30 parts by mass of the low density polyethylene, the second intermediate layer comprises 55-65 parts by mass of the second high density polyethylene and 35-45 parts by mass of the low density polyethylene, and the heat-seal layer comprises 25-35 parts by mass of the second metallocene polyethylene, 25-35 parts by mass of the metallocene linear low density polyethylene, 30-40 parts by mass of the low density polyethylene, 2-3 parts by mass of the slip agent, 0.5-1.5 parts by mass of the opening agent and 2-3 parts by mass of the silicone masterbatch.

[0009] Preferably, the first corona layer comprises 70 parts by mass of the first metallocene polyethylene, 15 parts by mass of the EAA and 15 parts by mass of the low density polyethylene; the first intermediate layer comprises 70 parts by mass of the first high density polyethylene and 30 parts by mass of the low density polyethylene; the inner layer comprises 70 parts by mass of the second high density polyethylene, 20 parts by mass of the metallocene linear low density polyethylene and 10 parts by mass of the low density polyethylene; the second corona layer comprises 75 parts by mass of the linear polyethylene and 25 parts by mass of the low density polyethylene, the second intermediate layer comprises 60 parts by mass of the second high density polyethylene and 40 parts by mass of the low density polyethylene, and the heat-seal layer comprises 30 parts by mass of the second metallocene polyethylene, 30 parts by mass of the metallocene linear low density polyethylene, 34 parts by mass of the low density polyethylene, 2.5 parts by mass of the slip agent, 1 part by mass of the opening agent and 2.5 parts by mass of the silicone masterbatch.

[0010] Preferably, the thickness ratio of the first corona layer, the first intermediate layer and the inner layer is 1:2:1; the thickness ratio of the second corona layer, the second intermediate layer and the heat-seal layer is 1:2:1; and the thickness ratio of the MDOPE layer, the high-barrier VMPE layer and the ultra-low temperature PE layer is 5:9:12.

[0011] Preferably, the brand of the first metallocene polyethylene is AT6410 produced by Dow Chemical Company; the brand of the EAA is Dow Chemical Company's Sure TM AE; the brand of the low-density polyethylene is 2420H produced by Yangzi Petrochemical Company; the brand of the first high-density polyethylene is AT6900 produced by Dow Chemical Company; the brand of the second high-density polyethylene is HD3355F produced by PTT Company in Thailand; the brand of the metallocene linear low-density polyethylene is 2012MA produced by Exxon Company; the brand of the linear polyethylene is F182 produced by Yangzi Petrochemical Company; the brand of the second metallocene polyethylene is KS340T produced by JPE Company; the brand of the slip agent is 10090-K produced by Anqing Company; the brand of the opening agent is AB-20LD produced by Beijing Yalun Company; the brand of the silicone masterbatch is MBSI-002P produced by Dow Corning Company.

[0012] Preferably, the MDOPE layer is prepared by gravure printing of MDOPE film.

[0013] Preferably, the total thickness of the packaging film is 130 microns.

[0014] To achieve the second purpose, the application provides a preparation process of the ultra-low-temperature recyclable liquid washing small packaging film, comprising the following steps:

[0015] S1, weighing each raw material particle of the high-barrier VMPE layer to perform film blowing processing, and then performing vacuum aluminum plating treatment on the first corona layer to obtain the high-barrier VMPE layer;

[0016] S2, weighing each raw material particle of the ultra-low-temperature PE layer to perform film blowing processing to obtain the ultra-low-temperature PE layer;

[0017] S3, preparing the MDOPE layer by gravure printing of MDOPE (uniaxial stretching PE) film; then dry-compositing the MDOPE layer and the high-barrier VMPE layer, and then sequentially performing maturation and cooling to obtain the MDOPE / VMPE composite layer;

[0018] S4, sequentially performing online corona processing and maturation of the MDOPE / VMPE composite layer and the ultra-low-temperature PE layer to obtain the packaging film.

[0019] Preferably, in the film blowing processing in steps S1 and S2, high-pressure online corona treatment is performed to make the surface reach an optical density value of 38 or more; in step S1, the OD value (optical density) of the first corona layer after the vacuum aluminum plating treatment is 2.5.

[0020] Preferably, in step S3, the glue used in dry compounding is a high-ally adhesive prepared from a first main agent, a first curing agent and ethyl ester in a mass ratio of 20:3:30, the first main agent is EA6128A, the first curing agent is EA6128B, and after compounding, it is placed in a curing chamber with a temperature of 50 degrees for 24 hours, then taken out and cooled for 24 hours before secondary compounding, which is the corona online compounding in step S4.

[0021] In step S4, before compounding, the corona machine is turned on and set to a current of 9.8kvA, the MDOPE / VMPE composite layer prepared in step S3 is first subjected to corona treatment, then coated with glue, and then laminated and compounded with the ultra-low temperature PE layer in an oven, after compounding, it is placed in a curing chamber at 50 degrees for 36 hours; the glue used for coating is prepared from a second main agent, a second curing agent and ethyl ester in a mass ratio of 20:4:32, the second main agent is Huateng UK2866A, and the second curing agent is Huateng 2866.

[0022] The advantages of the present application are:

[0023] (1) The packaging film prepared by the present application has a low sealing temperature, meets the requirements of high-speed packaging equipment, has high water vapor barrier property, can reduce the loss of moisture of liquid washing small packaging, and the material from the outer layer to the middle layer to the inner layer is PE material, the whole film is composed of single PE material, which can be recycled and processed after use, greatly reducing the pollution to the environment.

[0024] (2) The composite film of the present application has better moisture resistance than the original liquid washing small packaging, can reduce the loss of moisture during the shelf life, and can ensure the quality of the packaged content for a long time; since the inner layer is low-temperature PE, the whole film has a wider heat sealing window, good machine adaptability, good tearing effect, and the customer uses more conveniently, and the whole film is composed of PE resin, which is a single PE material, compared with the original polyester and polyolefin composite packaging, the used film can be recycled and processed.

[0025] (3) In the high-barrier VMPE layer of the present application, the first corona layer: the use of first metallocene polyethylene and EAA can improve the adhesion of the aluminum layer after plating, the adhesion of the aluminum layer is higher, the surface tension decays slowly, and the adhesion of the aluminum layer can be maintained more persistently, the peeling strength after compounding is more persistent and stable, and there is no delamination, reducing the probability of aluminum layer peeling and transferring after compounding;

[0026] The first intermediate layer: the first high-density polyethylene with a density of 0.969g / cm 3The packaging film can provide excellent moisture-proof effect, greatly improve the overall moisture-proof performance of the packaging film, and improve the overall film stiffness, so that the online packaging machine adaptability is better, and the overall processability is better when matched with a certain proportion of low-density polyethylene.

[0027] The inner layer is added with 70wt% of the second high-density polyethylene, which improves the overall density and stiffness of the packaging film and the water-blocking effect, and a certain amount of metallocene linear low-density polyethylene can improve the peeling strength of the composite packaging film.

[0028] (4) In the ultra-low temperature PE layer of the application, the second corona layer uses linear polyethylene with a brand of F182, does not contain slip agent and opening agent, so that the film composite is more firm and is not easy to delaminate;

[0029] The second high-density polyethylene with a brand of HD3355F is added in the second intermediate layer, which can improve the density of the film and the overall moisture-proof performance and stiffness of the composite film, so that the online packaging machine adaptability is better, and the overall processability is better when matched with a certain proportion of low-density polyethylene.

[0030] The inner layer is added with 30wt% of the second metallocene polyethylene with a brand of KS340T, which has a melting point of 60 degrees, can provide a lower heat sealing temperature, and because the outer surface of the packaging film is an MDOPE layer, the heat resistance is poor, and if high-temperature processing is used, the film is easy to scorch and wrinkle, therefore, the ultra-low temperature PE layer is used in the inner layer of the packaging film, which can provide a wider heat sealing processing window, and is matched with metallocene linear low-density polyethylene with a brand of 2012MA and low-density polyethylene with a brand of 2420H, so that the heat sealing temperature of the inner layer (ultra-low temperature PE layer) of the packaging film is 80-85 degrees, and the overall 125 degrees can be completely sealed, the sealing performance is better, and the mechanical performance is better; the opening agent with a brand of AB-20LD and the silicone master batch with a brand of MBSI-002P are added, which can improve the opening property of the packaging film and reduce the occurrence of the packaging film adhesion, and the slip agent with a brand of 10090-K is added, which can reduce the friction coefficient of the film, so that the packaging film runs more smoothly on the packaging machine. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The flowchart of the application is shown. DETAILED DESCRIPTION

[0032] Example 1

[0033] An ultra-low temperature recyclable liquid washing small packaging film, which comprises an MDOPE layer, a high-barrier VMPE layer and an ultra-low temperature PE layer connected in sequence.

[0034] The high-barrier VMPE layer is composed of a first corona layer, a first intermediate layer and an inner layer connected in sequence; the first corona layer comprises 65 parts by mass of a first metallocene polyethylene, 20 parts by mass of EAA (ethylene acrylic acid copolymer) and 15 parts by mass of low-density polyethylene; the first intermediate layer comprises 65 parts by mass of a first high-density polyethylene and 35 parts by mass of low-density polyethylene; and the inner layer comprises 65 parts by mass of a second high-density polyethylene, 25 parts by mass of a metallocene linear low-density polyethylene and 10 parts by mass of low-density polyethylene.

[0035] The ultra-low-temperature PE layer is composed of a second corona layer, a second intermediate layer and a heat-sealing layer connected in sequence; the first corona layer is connected with the MDOPE layer after an aluminizing process, and the inner layer is connected with the second corona layer. The second corona layer comprises 70 parts by mass of linear polyethylene and 30 parts by mass of low-density polyethylene, the second intermediate layer comprises 55 parts by mass of a second high-density polyethylene and 45 parts by mass of low-density polyethylene, and the heat-sealing layer comprises 25 parts by mass of a second metallocene polyethylene, 30 parts by mass of a metallocene linear low-density polyethylene, 40 parts by mass of low-density polyethylene, 2 parts by mass of a slip agent, 1 part by mass of an opening agent and 2 parts by mass of silicone masterbatch.

[0036] As shown in Figure 1 , a preparation process of an ultra-low-temperature recyclable liquid washing small packaging film comprises the following steps:

[0037] S1, the high-barrier VMPE layer is blown into a film according to the above formula, high-pressure online corona treatment is performed in the film blowing process, so that the surface reaches a surface resistance value of 38 or more, and after the film blowing process, high-vacuum aluminizing treatment is performed to plate aluminum on the first corona layer, so that the OD value reaches 2.5.

[0038] S2, the ultra-low-temperature PE layer is blown into a film according to the above formula, high-pressure online corona treatment is performed in the film blowing process, so that the surface reaches a surface resistance value of 38 or more;

[0039] S3, the MDOPE layer is dry compounded with the high-barrier VMPE layer after the MDOPE film is subjected to gravure printing, the adhesive is selected to be a high-adhesion adhesive, the adhesive ratio is main agent (EA6128A) : curing agent (EA6128B) : ethyl ester = 20 : 3 : 30, after the compounding, the MDOPE / VMPE composite layer is prepared by being placed in a curing room at 50 degrees for curing for 24 hours, and then being cooled for 24 hours;

[0040] S4, the second corona is online, before the compounding, open the corona machine, set the current of the corona machine to 9.8kvA, the MDOPE / VMPE composite layer prepared in step S3 is first subjected to corona treatment, then coated with glue, and then subjected to lamination and compounding with the ultra-low temperature PE layer in an oven. The glue ratio is main agent (Huateng UK2866A) : curing agent (Huateng 2866) : ethyl ester = 20:4:32. After compounding, it is placed in a curing room at 50 degrees for 36 hours to obtain a packaging film.

[0041] Example 2

[0042] The packaging film and the preparation method of this example are different from example 1 in the formula of the high barrier VMPE layer and the formula of the ultra-low temperature PE layer, and the others are the same as example 1.

[0043] The formula of the high barrier VMPE layer and the formula of the ultra-low temperature PE layer of the packaging film of this example are respectively:

[0044] In the high barrier VMPE layer, the first corona layer includes 70 parts by mass of the first metallocene polyethylene, 15 parts by mass of the EAA, and 15 parts by mass of the low-density polyethylene; the first intermediate layer includes 70 parts by mass of the first high-density polyethylene and 30 parts by mass of the low-density polyethylene; and the inner layer includes 70 parts by mass of the second high-density polyethylene, 20 parts by mass of the metallocene linear low-density polyethylene, and 10 parts by mass of the low-density polyethylene.

[0045] In the ultra-low temperature PE layer, the second corona layer includes 75 parts by mass of the linear polyethylene and 25 parts by mass of the low-density polyethylene; the second intermediate layer includes 60 parts by mass of the second high-density polyethylene and 40 parts by mass of the low-density polyethylene; and the heat-seal layer includes 30 parts by mass of the second metallocene polyethylene, 30 parts by mass of the metallocene linear low-density polyethylene, 34 parts by mass of the low-density polyethylene, 2.5 parts by mass of the slip agent, 1 part by mass of the opening agent, and 2.5 parts by mass of the silicone master batch.

[0046] Example 3

[0047] The packaging film and the preparation method of this example are different from example 1 in the formula of the high barrier VMPE layer and the formula of the ultra-low temperature PE layer, and the others are the same as example 1.

[0048] The formula of the high barrier VMPE layer and the formula of the ultra-low temperature PE layer of the packaging film of this example are respectively:

[0049] In the high-barrier VMPE layer, the first corona layer comprises 75 parts by mass of first metallocene polyethylene, 10 parts by mass of EAA and 15 parts by mass of low-density polyethylene; the first intermediate layer comprises 75 parts by mass of first high-density polyethylene and 25 parts by mass of low-density polyethylene; and the inner layer comprises 75 parts by mass of second high-density polyethylene, 15 parts by mass of metallocene linear low-density polyethylene and 10 parts by mass of low-density polyethylene.

[0050] In the ultra-low temperature PE layer, the second corona layer comprises 80 parts by mass of linear polyethylene and 20 parts by mass of low-density polyethylene; the second intermediate layer comprises 65 parts by mass of second high-density polyethylene and 35 parts by mass of low-density polyethylene; and the heat-sealing layer comprises 35 parts by mass of second metallocene polyethylene, 25 parts by mass of metallocene linear low-density polyethylene, 32.5 parts by mass of low-density polyethylene, 3 parts by mass of slip agent, 1.5 parts by mass of opening agent, and 3 parts by mass of silicone masterbatch.

[0051] The particle grades used in Examples 1-3 above are as follows: the grade of the first metallocene polyethylene is AT6410 manufactured by Dow Chemical Company; the grade of EAA is Fiberglass manufactured by Dow Chemical Company. TM AE; Low-density polyethylene grade 2420H produced by Yangzi Petrochemical Company; First high-density polyethylene grade AT6900 produced by Dow Chemical Company; Second high-density polyethylene grade HD3355F produced by PTT Company of Thailand; Metallocene linear low-density polyethylene grade 2012MA produced by ExxonMobil; Linear polyethylene grade F182 produced by Yangzi Petrochemical Company; Second metallocene polyethylene grade KS340T produced by JPE Company; Slip agent grade 10090-K produced by Anpeise Company; Opening agent grade AB-20LD produced by Beijing Yalun Company; Silicone masterbatch grade MBSI-002P produced by Dow Corning Company.

[0052] Comparative Example 1

[0053] PET / PE / VMPET / PE composite film.

[0054] Comparative Example 2

[0055] PET / VMPET / PE composite film.

[0056] The packaging film prepared in Example 2 was subjected to performance tests, as shown in Table 1 below:

[0057]

[0058] As shown in Table 1, the packaging film prepared by this invention has a moisture barrier value (WVTR) < 0.2 g / (㎡·24h) and an oxygen barrier value (OTR) < 10 cm⁻¹. 3The packaging film has a barrier property of 0.1 g / m2*24h*0.1 MPa, a heat-seal initiation temperature of 85 DEG C, and a heat-seal strength of greater than or equal to 25 N / 15 mm, and relative to Comparative Examples 1 and 2, the packaging film prepared by the application has high barrier property, low heat-seal initiation temperature, and high heat-seal strength.

[0059] The packaging film of the application is composed of PE material from the outer layer to the middle layer to the inner layer, and the whole film is composed of single PE material, which is convenient for recycling and creating value.

[0060] The above is only a preferred embodiment of the application, and is not intended to limit the application, and any modification, equivalent replacement and improvement within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An ultra-low temperature recyclable liquid laundry pouch film, characterized in that: The packaging film comprises an MDOPE layer, a high-barrier VMPE layer and an ultra-low temperature PE layer connected in sequence, the high-barrier VMPE layer is composed of a first corona layer, a first intermediate layer and an inner layer connected in sequence; the ultra-low temperature PE layer is composed of a second corona layer, a second intermediate layer and a heat-sealing layer connected in sequence; the first corona layer is connected with the MDOPE layer after an aluminizing process, and the inner layer is connected with the second corona layer. The first corona layer comprises 65-75 parts by mass of a first metallocene polyethylene, 10-20 parts by mass of EAA and 10-20 parts by mass of low-density polyethylene; the first intermediate layer comprises 65-75 parts by mass of a first high-density polyethylene, 25-35 parts by mass of low-density polyethylene; the inner layer comprises 65-75 parts by mass of a second high-density polyethylene, 15-25 parts by mass of a metallocene linear low-density polyethylene and 5-15 parts by mass of low-density polyethylene; the second corona layer comprises 70-80 parts by mass of a linear polyethylene, 20-30 parts by mass of low-density polyethylene, the second intermediate layer comprises 55-65 parts by mass of a second high-density polyethylene and 35-45 parts by mass of low-density polyethylene, and the heat-sealing layer comprises 25-35 parts by mass of a second metallocene polyethylene, 25-35 parts by mass of a metallocene linear low-density polyethylene, 30-40 parts by mass of low-density polyethylene, 2-3 parts by mass of a slip agent, 0.5-1.5 parts by mass of an opening agent and 2-3 parts by mass of silicone masterbatch.

2. The ultra-low temperature recyclable liquid laundry pouch film according to claim 1, wherein: The first corona layer comprises 70 parts by mass of a first metallocene polyethylene, 15 parts by mass of EAA and 15 parts by mass of low-density polyethylene; the first intermediate layer comprises 70 parts by mass of a first high-density polyethylene, 30 parts by mass of low-density polyethylene; the inner layer comprises 70 parts by mass of a second high-density polyethylene, 20 parts by mass of a metallocene linear low-density polyethylene and 10 parts by mass of low-density polyethylene; the second corona layer comprises 75 parts by mass of a linear polyethylene, 25 parts by mass of low-density polyethylene, the second intermediate layer comprises 60 parts by mass of a second high-density polyethylene and 40 parts by mass of low-density polyethylene, and the heat-sealing layer comprises 30 parts by mass of a second metallocene polyethylene, 30 parts by mass of a metallocene linear low-density polyethylene, 34 parts by mass of low-density polyethylene, 2.5 parts by mass of a slip agent, 1 part by mass of an opening agent and 2.5 parts by mass of silicone masterbatch.

3. The ultra-low temperature recyclable liquid laundry pouch film according to claim 1, wherein: The thickness ratio of the first corona layer, the first intermediate layer and the inner layer is 1:2:1; the thickness ratio of the second corona layer, the second intermediate layer and the heat-sealing layer is 1:2:1; and the thickness ratio of the MDOPE layer, the high-barrier VMPE layer and the ultra-low temperature PE layer is 5:9:

12.

4. The ultra-low temperature recoverable liquid laundry pouch film according to claim 1 or 2, characterized in that: The first metallocene polyethylene is AT6410 produced by Dow Chemical Company; the EAA is Nucrel® AE produced by Dow Chemical Company; the low-density polyethylene is 2420H produced by Yangzi Petrochemical Company; the first high-density polyethylene is AT6900 produced by Dow Chemical Company; the second high-density polyethylene is HD3355F produced by PTT Company in Thailand; the metallocene linear low-density polyethylene is 2012MA produced by Exxon Company; the linear polyethylene is F182 produced by Yangzi Petrochemical Company; the second metallocene polyethylene is KS340T produced by JPE Company; the slip agent is 10090-K produced by Anqing Company; the opening agent is AB-20LD produced by Beijing Yalun Company; and the silicone masterbatch is MBSI-002P produced by Dow Corning Company.

5. The ultra-low temperature recyclable liquid laundry pouch packaging film according to claim 1, wherein: The MDOPE layer is prepared by gravure printing of the MDOPE film.

6. The ultra-low temperature recyclable liquid laundry pouch packaging film according to claim 1, wherein: The total thickness of the packaging film is 130 μm.

7. A process for the preparation of ultra-low temperature recyclable liquid laundry pouch film according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1, weighing each raw material particle of the high-barrier VMPE layer to perform film blowing processing, and then performing vacuum aluminum plating treatment on the first corona layer to obtain the high-barrier VMPE layer; S2, weighing each raw material particle of the ultra-low-temperature PE layer to perform film blowing processing to obtain the ultra-low-temperature PE layer; S3, preparing the MDOPE layer by gravure printing of the MDOPE film, and then dry compounding the MDOPE layer and the high-barrier VMPE layer, and then performing aging and cooling in sequence to obtain the MDOPE / VMPE composite layer; S4, sequentially performing the corona online compounding process and aging on the MDOPE / VMPE composite layer and the ultra-low-temperature PE layer to obtain the packaging film.

8. The process for the preparation of ultra-low temperature recyclable liquid laundry pouch film according to claim 7, characterized in that, In steps S1 and S2, high-pressure online corona treatment is performed during the film blowing processing to make the surface reach an English value of 38 or more; in step S1, the OD value of the first corona layer after the vacuum aluminum plating treatment is 2.

5.

9. The process for the preparation of ultra-low temperature recyclable liquid laundry pouch film according to claim 7, characterized in that, In step S3, the adhesive used in the dry compounding is Gaomeng adhesive, which is prepared from a first main agent, a first curing agent and ethyl ester according to a mass ratio of 20:3:30; in step S4, the adhesive used in the corona online compounding process is prepared from a second main agent, a second curing agent and ethyl ester according to a mass ratio of 20:4:32.

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