A non-adhesive thin film and its preparation method

Abstract

This invention relates to the field of membrane materials technology, specifically providing a non-adhesive film and its preparation method. Based on the total thickness of the non-adhesive film, the non-adhesive film, from top to bottom, consists of: 5-20% layer A, 15-30% layer B, 25-40% layer C, 15-30% layer D, and 5-20% layer E. Layers A and E are surface layers primarily composed of low-density polyethylene, while layers B, C, and D are reinforcing layers primarily composed of metallocene polyethylene and linear low-density polyethylene. The film layer design of the five-layer co-extruded film, including the types of raw materials and the amount of components, is optimized to utilize the complementary synergistic effect of low-density polyethylene, metallocene polyethylene, and linear low-density polyethylene, giving the film excellent tensile strength, puncture resistance, tear resistance, and aging resistance, meeting the needs of large-scale agricultural packaging films.

Description

Technical Field

[0001] This invention relates to the field of membrane materials technology, B32B27 / 32, and particularly to a non-adhesive thin film and its preparation method. Background Technology

[0002] With the development of agricultural mechanization, traditional loose cotton pickers are being replaced by automatic baling cotton pickers. These automatic baling cotton pickers roll the picked cotton into cylindrical bales and then wrap them with packaging film, effectively improving harvesting and transportation efficiency. Typically, each bale has a diameter of 2.2-2.4 meters and weighs approximately 2.2 tons, requiring the packaging film to have sufficient tensile strength and elongation properties. Secondly, even in complex operations and transportation processes, the packaging film must possess excellent puncture and tear resistance. Furthermore, the packaged cotton requires a certain sales process, generally remaining in the cotton field for 1-3 months or longer; therefore, the packaging film must also have good anti-aging and UV resistance properties.

[0003] Chinese patent CN117227292B discloses a high-barrier biaxially oriented polyethylene film, its preparation method, and its application. The polyethylene film of this patent includes a substrate layer, a barrier layer, and a puncture-resistant layer. The substrate layer includes low-density polyethylene, metallocene polyethylene, and maleic anhydride-grafted polyethylene with compatibilizer. The barrier layer includes modified polyethylene terephthalate and high-density polyethylene. The puncture-resistant layer includes low-density polyethylene, an elastomer, and nylon resin. This patent utilizes the synergistic effect of elastomer and nylon resin to improve the puncture resistance, tensile strength, and tensile strength of the film material, but it does not focus on the anti-aging performance of the film. Chinese patent CN115926300A discloses a puncture-resistant and tear-resistant PE stretch film and its preparation method. The patent specifies that the carbon number of metallocene polyethylene and linear low-density polyethylene is 6, and it is used in combination with LDPE, polyisobutylene and polyethylene terephthalate to improve the tensile strength, elongation and elongation at break of the film. However, there is still a lot of room for improvement in the above mechanical properties, and it also does not pay attention to the aging resistance of the film. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention first provides a non-adhesive film, comprising a five-layer co-extruded film; in terms of the total thickness of the non-adhesive film, the non-adhesive film from top to bottom is as follows: 5-20% layer A, 15-30% layer B, 25-40% layer C, 15-30% layer D, and 5-20% layer E.

[0005] Furthermore, the thickness of the non-adhesive film is 0.05-0.15 mm, preferably 0.06-0.10 mm, and more preferably 0.075-0.08 mm.

[0006] Furthermore, layers A and E are surface layers primarily composed of low-density polyethylene, while layers B, C, and D are reinforcing layers primarily composed of metallocene polyethylene and linear low-density polyethylene.

[0007] Further, based on the total mass of the A-layer components, the A-layer components include: 75-95% low-density polyethylene, 1-10% anti-aging agent, 1-10% inorganic anti-adhesion agent, and 0.1-6% amide substances.

[0008] Preferably, based on the total mass of the components of layer A, the components of layer A include: 85-95% low-density polyethylene, 3-6% anti-aging agent, 3-5% inorganic anti-adhesion agent, and 1-5% amide substances.

[0009] Furthermore, the low-density polyethylene has a melt index of 1.7-2.2 g / 10 min at 190℃ / 2.16 kg, preferably 1.8-2.0 g / 10 min, and more preferably 1.9 g / 10 min.

[0010] Furthermore, the low-density polyethylene has a longitudinal tensile strength ≥24MPa and a transverse tensile strength ≥15MPa.

[0011] In a preferred embodiment, the low-density polyethylene has a longitudinal tensile strength of 26 MPa and a transverse tensile strength of 18 MPa.

[0012] Furthermore, the anti-aging agent includes, but is not limited to, at least one of hindered phenolic compounds, phosphate ester compounds, benzophenone compounds, benzotriazole compounds, and hindered amine compounds.

[0013] Preferably, the anti-aging agent comprises hindered phenolic compounds, benzophenone compounds, and hindered amine compounds, with a mass ratio of 1-4:1-2:0.5-2.

[0014] Furthermore, the hindered phenolic compounds include, but are not limited to, at least one of 2,6-di-tert-butyl-p-cresol, triethylene glycol bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)acrylonitrile, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and triethylene glycol bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate].

[0015] Preferably, the hindered phenolic compound includes pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0016] Furthermore, the phosphate ester compounds include, but are not limited to, at least one of bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate, tris[2,4-di-tert-butylphenyl]phosphite, and bis[2,4-di-tert-butylphenyl] pentaerythritol diphosphite.

[0017] Furthermore, the benzophenone compound includes, but is not limited to, at least one of 2,2'-dihydroxy-4,4'-dimethoxybenzophenone and 2-hydroxy-4-n-octyloxybenzophenone.

[0018] Preferably, the benzophenone compound includes 2-hydroxy-4-n-octyloxybenzophenone.

[0019] Furthermore, the benzotriazole compounds include, but are not limited to, at least one of 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole and 2-(2'-hydroxy-3',5'-dicumylphenyl)benzotriazole.

[0020] Furthermore, the hindered amine compounds include, but are not limited to, at least one of bis-2,2,6,6-tetramethylpiperidinol sebacate and bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.

[0021] Preferably, the hindered amine compound includes bis-2,2,6,6-tetramethylpiperidinol sebacate.

[0022] In a preferred embodiment, the anti-aging agent comprises pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, wherein the mass ratio of the three is 1-4:1-2:0.5-2, more preferably 2:1:1. The film is formulated with pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate as anti-aging agents, with a strictly specified mass ratio of 1-4:1-2:0.5-2, preferably 2:1:1. This combination ensures the film can withstand harsh environments such as prolonged exposure to light, strong ultraviolet light, and large diurnal temperature variations, resulting in an anti-aging lifespan exceeding 12 months. This is likely because the above anti-aging agents can effectively absorb a wider range of ultraviolet light wavelengths and effectively prevent system oxidation. In particular, they exhibit better dispersion performance and dispersion state in specific metallocene polyethylene and linear low-density polyethylene melt systems, ensuring optimal anti-aging properties.

[0023] Furthermore, the inorganic anti-adhesive includes at least one of silica, talc, mica, white clay, and kaolin, preferably silica.

[0024] Furthermore, the amide substances include, but are not limited to, at least one of stearyl ethoxyamide, erucamide, and oleamide.

[0025] Preferably, the amide substance includes stearyl ethoxyamide.

[0026] This application uses 3-5% silica and 1-3% stearyl ethoxylate in layers A and E to reduce the problem of film adhesion and separation after winding. Silica is a commonly used inorganic anti-stick agent, but its addition can affect the film's transparency and the compatibility between layers A / E and layers B / D. The use of a certain amount of stearyl ethoxylate not only solves the film transparency problem but also better prevents film adhesion.

[0027] Furthermore, the composition of layer E is the same as that of layer A.

[0028] Further, based on the total mass of the B-layer component, the B-layer component comprises 60-75% metallocene polyethylene, 15-40% linear low-density polyethylene, 1-8% anti-aging agent, and 0.5-10% coloring resin.

[0029] Preferably, based on the total mass of the B-layer components, the B-layer components comprise 65-70% metallocene polyethylene, 20-30% linear low-density polyethylene, 3-5% anti-aging agent, and 3-5% coloring resin.

[0030] Furthermore, the melt mass flow rate of the metallocene polyethylene at 190℃ / 2.16kg is 0.1-2g / 10min, preferably 0.1-0.5g / min.

[0031] Furthermore, the linear low-density polyethylene has a melt flow rate of 0.1-1 g / 10 min at 190°C / 2.16 kg, preferably 0.1-0.3 g / min.

[0032] Furthermore, the components of layer D and layer B are identical.

[0033] Furthermore, based on the total mass of the C-layer components, the C-layer components comprise 65-80% metallocene polyethylene, 10-30% linear low-density polyethylene, and 2-13% coloring resin.

[0034] Preferably, based on the total mass of the C-layer components, the C-layer components comprise 70-75% metallocene polyethylene, 15-25% linear low-density polyethylene, and 6-10% coloring resin.

[0035] Metallocene polyethylene (MCPE) has a high degree of structural regularity and a narrow molecular weight distribution, exhibiting excellent heat resistance, chemical stability, and mechanical properties. However, it is difficult to process, and its flowability and uniformity are not easily controlled during processing. Linear low-density polyethylene (LLDPE) has a longer branch chain length than HDPE but shorter than LDPE, resulting in better heat resistance, impact resistance, tensile strength, and flexural strength. Furthermore, its lower crystallinity can improve the processability shortcomings of MPE. However, it is necessary to strictly define the specific relative content of MPE and LLDPE in each layer structure. Utilizing the complementary synergistic effect of the two, layer structure design, and interlayer compatibility not only solves the processability problem but also optimizes the tensile strength, puncture resistance, and tear resistance of the film.

[0036] Secondly, the present invention provides a method for preparing a non-adhesive film; the preparation method is as follows: each layer of raw material is mixed and then added to an extrusion blown film machine for extrusion and blowing, and the edges are trimmed.

[0037] Furthermore, the extrusion temperature of the A and E layers is 140-180°C.

[0038] Furthermore, the extrusion temperatures of the A and E layers are as follows: Zone 1: 140-160℃, Zone 2: 150-170℃, Zone 3: 160-180℃, Zone 4: 160-180℃.

[0039] Preferably, the extrusion zone temperatures of the A and E layers are: Zone 1: 150±5℃, Zone 2: 160±5℃, Zone 3: 170±5℃, and Zone 4: 170±5℃.

[0040] Furthermore, the extrusion temperature of the B, C, and D layers is 145-200°C.

[0041] Furthermore, the extrusion temperatures of the B, C, and D layers are as follows: Zone 1: 145-165℃, Zone 2: 160-180℃, Zone 3: 170-190℃, and Zone 4: 180-200℃.

[0042] Preferably, the extrusion temperatures of the B, C, and D layers are: Zone 1: 155±5℃, Zone 2: 170±5℃, Zone 3: 180±5℃, and Zone 4: 190±5℃.

[0043] Furthermore, the die temperature of the extrusion blown film machine is 170-200℃.

[0044] Furthermore, the die head temperature of the extrusion blown film machine is as follows: Zone 1: 170-190℃, Zone 2: 180-200℃, Zone 3: 180-200℃, Zone 4: 190-200℃, Zone 5: 190-200℃.

[0045] Preferably, the die head temperature of the extrusion blown film machine is: Zone 1: 180±5℃, Zone 2: 190±5℃, Zone 3: 190±5℃, Zone 4: 195±5℃, Zone 5: 195±5℃.

[0046] Furthermore, the non-adhesive film is used for agricultural packaging, including but not limited to the automatic packing process of cotton harvesters.

[0047] Beneficial effects

[0048] 1. This application optimizes the film layer design of the five-layer co-extruded film, the types of raw materials and the amount of components in the film layer, so as to utilize the complementary synergistic effect of low-density polyethylene, metallocene polyethylene and linear low-density polyethylene to give the film excellent tensile strength, puncture resistance and tear resistance, etc., tensile strength >30MPa, elongation at break >700%, right angle tear strength >7N, puncture resistance >4.5N, and also gives the film good processability, which can meet the needs of large-scale use of agricultural packaging film;

[0049] 2. This application specifies that the anti-aging agents in the film layer include pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, in a mass ratio of 1-4:1-2:0.5-2, which enables the packaging film to withstand the use environment of long light exposure time, strong ultraviolet rays, and large temperature difference between day and night, and its anti-aging life exceeds 12 months;

[0050] 3. The five-layer co-extruded non-adhesive film of this application has excellent compatibility, which not only makes the film surface more tightly bonded and improves the various properties of the film, but also has excellent film surface smoothness, transparency and uniformity. Detailed Implementation

[0051] Example

[0052] Example 1

[0053] This embodiment provides a non-adhesive film comprising five co-extruded layers; based on the total thickness of the non-adhesive film, the non-adhesive film from top to bottom consists of: 12% layer A, 23% layer B, 30% layer C, 23% layer D, and 12% layer E; the thickness of the non-adhesive film is 0.075 mm.

[0054] Based on the total mass of the components in layer A, the components of layer A include: 90% low-density polyethylene, 4% anti-aging agent, 4% inorganic anti-adhesion agent, and 2% amide substances.

[0055] The low-density polyethylene has a melt index of 1.9 g / 10 min at 190℃ / 2.16 kg, a longitudinal tensile strength of 26 MPa, and a transverse tensile strength of 18 MPa, and was purchased from CNOOC Shell 2420H; the anti-aging agent is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, with a mass ratio of 2:1:1; the inorganic anti-adhesive is silicon dioxide; and the amide is stearyl ethoxyamide.

[0056] Based on the total mass of the B-layer component, the B-layer component comprises 68% metallocene polyethylene, 25% linear low-density polyethylene, 4% anti-aging agent, and 3% coloring resin.

[0057] Based on the total mass of the C-layer components, the C-layer components comprise 72% metallocene polyethylene, 20% linear low-density polyethylene, and 8% coloring resin.

[0058] The metallocene polyethylene described above has a melt flow rate of 0.2 g / min at 190℃ / 2.16 kg and was purchased from Exxon XP6026ML; the linear low-density polyethylene has a melt flow rate of 0.2 g / min at 190℃ / 2.16 kg and was purchased from Borealis FB2230; the coloring resin was purchased from Juchi Plastics UY508.

[0059] The composition of layer E is the same as that of layer A, and the composition of layer D is the same as that of layer B.

[0060] Secondly, this embodiment also provides a method for preparing the non-adhesive film, which is to mix each layer of raw material and then add it to an extrusion blown film machine for extrusion and blown film production, and then trim the edges.

[0061] The extrusion zone temperatures for layers A and E are as follows: Zone 1: 150℃, Zone 2: 160℃, Zone 3: 170℃, Zone 4: 170℃; Screen changer: 175℃, Adapter: 175℃. The extrusion zone temperatures for layers B, C, and D are as follows: Zone 1: 155℃, Zone 2: 170℃, Zone 3: 180℃, Zone 4: 190℃; Screen changer: 190℃, Adapter: 190℃. The die head temperature of the extrusion blown film machine is as follows: Zone 1: 180℃, Zone 2: 190℃, Zone 3: 190℃, Zone 4: 195℃, Zone 5: 195℃.

[0062] Example 2

[0063] This embodiment provides a non-adhesive film comprising five co-extruded layers; based on the total thickness of the non-adhesive film, the non-adhesive film, from top to bottom, consists of: 15% layer A, 25% layer B, 20% layer C, 25% layer D, and 15% layer E; the thickness of the non-adhesive film is 0.080 mm.

[0064] Based on the total mass of the components in layer A, the components of layer A include: 85% low-density polyethylene, 6% anti-aging agent, 5% inorganic anti-adhesive agent, and 4% amide substances.

[0065] The low-density polyethylene has a melt index of 1.9 g / 10 min at 190℃ / 2.16 kg, a longitudinal tensile strength of 26 MPa, and a transverse tensile strength of 18 MPa, and was purchased from CNOOC Shell 2420H; the anti-aging agent is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, in a mass ratio of 1:2:2; the inorganic anti-adhesive is silicon dioxide; and the amide is stearyl ethoxyamide.

[0066] Based on the total mass of the B-layer component, the B-layer component comprises 70% metallocene polyethylene, 20% linear low-density polyethylene, 5% anti-aging agent, and 5% coloring resin.

[0067] Based on the total mass of the C-layer components, the C-layer components comprise 74% metallocene polyethylene, 20% linear low-density polyethylene, and 6% coloring resin.

[0068] The metallocene polyethylene described above has a melt flow rate of 0.2 g / min at 190℃ / 2.16 kg and was purchased from Exxon XP6026ML; the linear low-density polyethylene has a melt flow rate of 0.2 g / min at 190℃ / 2.16 kg and was purchased from Borealis FB2230; the coloring resin was purchased from Juchi Plastics UY508.

[0069] The composition of layer E is the same as that of layer A, and the composition of layer D is the same as that of layer B.

[0070] Secondly, this embodiment also provides a method for preparing the non-adhesive film, which is to mix each layer of raw material and then add it to an extrusion blown film machine for extrusion and blown film production, and then trim the edges.

[0071] The extrusion zone temperatures for layers A and E are as follows: Zone 1: 145℃, Zone 2: 155℃, Zone 3: 165℃, Zone 4: 165℃, Screen changer: 165℃, Adapter: 165℃. The extrusion zone temperatures for layers B, C, and D are as follows: Zone 1: 150℃, Zone 2: 165℃, Zone 3: 185℃, Zone 4: 185℃, Screen changer: 185℃, Adapter: 185℃. The die head temperatures for the extrusion blown film machine are as follows: Zone 1: 175℃, Zone 2: 175℃, Zone 3: 185℃, Zone 4: 190℃, Zone 5: 190℃.

[0072] Example 3

[0073] This embodiment provides a non-adhesive film comprising five co-extruded layers; based on the total thickness of the non-adhesive film, the non-adhesive film from top to bottom consists of: 12.5% ​​layer A, 20% layer B, 35% layer C, 20% layer D, and 12.5% ​​layer E; the thickness of the non-adhesive film is 0.10 mm.

[0074] Based on the total mass of the components in layer A, the components of layer A include: 93% low-density polyethylene, 3% anti-aging agent, 3% inorganic anti-adhesive agent, and 1% amide substances.

[0075] The low-density polyethylene has a melt index of 1.9 g / 10 min at 190℃ / 2.16 kg, a longitudinal tensile strength of 26 MPa, and a transverse tensile strength of 18 MPa, and was purchased from CNOOC Shell 2420H; the anti-aging agent is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, with a mass ratio of 4:1:0.5; the inorganic anti-adhesive is silicon dioxide; and the amide is stearyl ethoxyamide.

[0076] Based on the total mass of the B-layer component, the B-layer component comprises 65% metallocene polyethylene, 29% linear low-density polyethylene, 3% anti-aging agent, and 3% coloring resin.

[0077] Based on the total mass of the C-layer components, the C-layer components comprise 70% metallocene polyethylene, 20% linear low-density polyethylene, and 10% coloring resin.

[0078] The metallocene polyethylene described above has a melt flow rate of 0.2 g / min at 190℃ / 2.16 kg and was purchased from Exxon XP6026ML; the linear low-density polyethylene has a melt flow rate of 0.2 g / min at 190℃ / 2.16 kg and was purchased from Borealis FB2230; the coloring resin was purchased from Juchi Plastics UY508.

[0079] The composition of layer E is the same as that of layer A, and the composition of layer D is the same as that of layer B.

[0080] Secondly, this embodiment also provides a method for preparing the non-adhesive film, which is to mix each layer of raw material and then add it to an extrusion blown film machine for extrusion and blown film production, and then trim the edges.

[0081] The extrusion zone temperatures for layers A and E are as follows: Zone 1: 155℃, Zone 2: 165℃, Zone 3: 175℃, Zone 4: 175℃, Screen changer: 175℃, Adapter: 175℃. The extrusion zone temperatures for layers B, C, and D are as follows: Zone 1: 160℃, Zone 2: 175℃, Zone 3: 185℃, Zone 4: 195℃, Screen changer: 195℃, Adapter: 195℃. The die head temperature of the extrusion blown film machine is as follows: Zone 1: 185℃, Zone 2: 195℃, Zone 3: 195℃, Zone 4: 195℃, Zone 5: 195℃.

[0082] Comparative Example 1

[0083] The composition is basically the same as in Example 1, except that, based on the total mass of the components in layer A, layer A comprises: 5% low-density polyethylene and 5% anti-aging agent. The low-density polyethylene was purchased from CNOOC Shell 2420H; the anti-aging agent is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, in a mass ratio of 2:1:1. The composition of layer E is the same as that of layer A.

[0084] The non-adhesive packing film in this comparison model adheres to each other after being folded and rolled up, making it difficult to separate and resulting in packing failure.

[0085] Comparative Example 2

[0086] It is basically the same as Example 1, except that the low-density polyethylene is replaced with high-density polyethylene, which is purchased from ExxonMobil HTA108.

[0087] The non-adhesive packaging film in this comparison exhibits numerous "water ripples" on its surface, which is due to the incompatibility between the high-density polyethylene and metallocene polyethylene layers.

[0088] Comparative Example 3

[0089] It is basically the same as Example 1, except that: based on the total mass of the B layer component, the B layer component includes 55% metallocene polyethylene, 38% linear low-density polyethylene, 4% anti-aging agent, and 3% coloring resin.

[0090] Comparative Example 4

[0091] The results are basically the same as in Example 1, except that the anti-aging agent is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, with a mass ratio of 0.5:3:0.5. Performance testing methods and results are shown in Table 1.

[0092] Table 1

[0093]

[0094]

Claims

1. A non-adhesive film comprising five co-extruded layers, characterized in that, Based on the total thickness of the non-adhesive film, the non-adhesive film, from top to bottom, consists of: 5-20% layer A, 15-30% layer B, 25-40% layer C, 15-30% layer D, and 5-20% layer E; layers A and E are surface layers mainly composed of low-density polyethylene, and layers B, C, and D are reinforcing layers mainly composed of metallocene polyethylene and linear low-density polyethylene; Based on the total mass of the components in layer A, the components of layer A include: 85-95% low-density polyethylene, 3-6% anti-aging agent, 3-5% inorganic anti-adhesion agent, and 1-5% amide substances; The anti-aging agent comprises pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2-hydroxy-4-n-octyloxybenzophenone, and bis-2,2,6,6-tetramethylpiperidinol sebacate, in a mass ratio of 1-4:1-2:0.5-2. The amide is stearyl ethoxyamide; the inorganic anti-adhesive is silicon dioxide. Based on the total mass of the B-layer components, the B-layer components comprise 65-70% metallocene polyethylene, 20-30% linear low-density polyethylene, 3-5% anti-aging agent, and 3-5% coloring resin; Based on the total mass of the C-layer components, the C-layer components comprise 65-80% metallocene polyethylene, 10-30% linear low-density polyethylene, and 2-13% coloring resin; The composition of layer E is the same as that of layer A; The components of layer D and layer B are identical.

2. The non-tacky film according to claim 1, characterized by The metallocene polyethylene has a melt flow rate of 0.1-2 g / 10 min at 190 °C / 2.16 kg.

3. The non-tacky film according to claim 1, wherein The linear low-density polyethylene has a melt flow rate of 0.1-1 g / 10 min at 190℃ / 2.16 kg.

4. The method for preparing a non-adhesive film according to any one of claims 1-3, characterized in that, The preparation method is as follows: each layer of raw material is mixed and then added to an extrusion blown film machine for extrusion and film blowing, and the edges are trimmed; the extrusion zone temperature of the A layer and E layer is 140-180℃; the extrusion zone temperature of the B layer, C layer and D layer is 145-200℃; and the die head temperature of the extrusion blown film machine is 170-200℃.

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