Bonding resin for multi-layer co-extruded high-barrier film, preparation method therefor, and high-barrier film structure
Patent Information
- Application Number
- PCT/CN2024/134212
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-08
- Filing Date
- 2024-11-25
- Publication Date
- 2025-10-02
AI Technical Summary
Existing adhesive resins have poor bonding properties to polyethylene, polypropylene, and PET, leading to delamination problems. PE has poor ink adhesion as a printing layer, and PA is expensive as a printing layer.
A composite adhesive resin of grafted modified polyethylene, styrene block copolymer and ethylene-butylene elastomer is used and prepared by melt extrusion granulation to form a multi-layer co-extruded high-barrier film structure, including a heat-sealing layer, an adhesive layer and a printing layer.
It achieves excellent bonding performance to PET, PA and PE substrates, enhances the toughness and overall mechanical properties of the material, solves the problems of PE de-inking and high PA cost, and provides a high barrier film structure with strong ink adhesion and low cost.
Smart Images
Figure CN2024134212_02102025_PF_FP_ABST
Abstract
Description
Adhesive resin for multi-layer co-extruded high-barrier film, preparation method thereof, and high-barrier film structure Technical Field
[0001] The present application relates to the technical field of adhesive resins, and in particular to an adhesive resin for a multi-layer co-extruded high-barrier film, a preparation method thereof, and a high-barrier film structure. Background Art
[0002] In recent years, the high-barrier composite film industry has developed rapidly, with an increasing number of composite film product types and increasingly stringent performance requirements for composite film products in various fields. Among them, multi-layer co-extruded composite films based on polymer materials have been widely used in food packaging, logistics and transportation, new energy and other fields. Multi-layer composite films are usually prepared using multi-layer co-extrusion technology, such as co-extrusion of suitable inner and outer layers and an intermediate barrier layer. Existing barrier layers are mostly polar materials, which are incompatible with commonly used inner and outer layer structures such as non-polar materials such as ethylene, and have no adhesion to each other. In order to improve the bonding performance between the inner and outer layers and the intermediate barrier layer, adhesive resins are used for bonding between the inner layer and the intermediate barrier layer, and between the outer layer and the intermediate barrier layer.
[0003] However, existing adhesive resins have poor adhesion to polyethylene, polypropylene, and PET, easily causing delamination and other issues, making them unsuitable for use in multilayer composites. Existing printing layers are primarily made of PE or PA. However, PE as a printing layer has poor adhesion to ink, which can easily cause ink bleed, while PA as a printing layer is expensive. Therefore, developing a low-cost adhesive resin that achieves excellent adhesion to various substrates is crucial for the development of composite films. Summary of the Invention
[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
[0005] One purpose of the present application is to provide an adhesive resin for a multi-layer co-extruded high-barrier film, which has good bonding properties to PA, PE and PET, so that the printing layer of the high-barrier film structure can use PET instead of PE or PA, while ensuring strong ink adhesion and low cost.
[0006] Another object of the present application is to provide a method for preparing an adhesive resin for a multi-layer co-extruded high-barrier film.
[0007] Another object of the present application is to provide a high-barrier film structure.
[0008] In a first aspect, the present application provides an adhesive resin for a multi-layer co-extruded high-barrier film, which comprises the following components in parts by weight:
[0009] 20-40 parts of graft modified polyethylene, 20-30 parts of styrene block copolymer, 20-40 parts of polyethylene and 20-30 parts of ethylene-butylene elastomer;
[0010] In the ethylene-butene elastomer, the content of butene as the comonomer is 10% to 30%.
[0011] In a specific embodiment of the present application, the adhesive resin for the multi-layer co-extruded high barrier film includes the following components in parts by weight:
[0012] 25-30 parts of graft modified polyethylene, 20-25 parts of styrene block copolymer, 20-25 parts of polyethylene and 25-30 parts of ethylene-butylene elastomer.
[0013] In a specific embodiment of the present application, the adhesive resin has a melt index of 1 to 6 g / 10 min at 190° C. and 2.16 kg.
[0014] In a specific embodiment of the present application, the melt index of the ethylene-butene elastomer at 190°C and 2.16 kg is 0.5-7 g / 10 min. Furthermore, the density of the ethylene-butene elastomer is 0.85-0.91 g / cm 3 .
[0015] In a specific embodiment of the present application, the grafting agent in the graft-modified polyethylene is maleic anhydride, and the grafting rate is 0.6% to 1.2%. Furthermore, the graft-modified polyethylene is graft-modified linear low-density polyethylene.
[0016] In a specific embodiment of the present application, the melt index of the grafted modified polyethylene at 190°C and 2.16 kg is 1 to 4 g / 10 min. Furthermore, the density of the grafted modified polyethylene is 0.9 to 0.95 g / cm 3 .
[0017] In a specific embodiment of the present application, the styrene block copolymer is a hydrogenated styrene-butadiene block copolymer.
[0018] In a specific embodiment of the present application, the melt index of the styrene block copolymer at 190°C and 2.16 kg is 1 to 40 g / 10 min. Furthermore, the density of the styrene block copolymer is 0.8 to 1.2 g / cm 3 .
[0019] In a specific embodiment of the present application, the polyethylene is a linear low-density polyethylene. Further, the polyethylene has a melt index of 1 to 4 g / 10 min at 190°C and 2.16 kg; the polyethylene has a density of 0.9 to 0.95 g / cm 3 .
[0020] In a second aspect, the present application provides a method for preparing any one of the above-mentioned adhesive resins, comprising the following steps:
[0021] The components are mixed in proportion and melt-extruded to form granules.
[0022] In a third aspect, the present application provides a high barrier film structure comprising a heat seal layer, a first adhesive layer, a barrier layer, a second adhesive layer and a printing layer arranged in sequence; the first adhesive layer and / or the second adhesive layer is made of any of the adhesive resins described above;
[0023] The barrier layer is a nylon layer, the heat sealing layer is a PE layer, and the printing layer is a PET layer.
[0024] In a specific embodiment of the present application, the total weight of the first adhesive layer and the second adhesive layer is 8% to 20% of the weight of the high barrier film structure.
[0025] Compared with the related art, the beneficial effects of this application are:
[0026] (1) The adhesive resin of the present application has excellent bonding properties through the combination of various components, and has high and long-lasting bonding strength with the specific barrier layer, printing layer and heat seal layer; at the same time, the combination of various components can enhance the toughness of the material and improve the overall mechanical properties of the material;
[0027] (2) The adhesive resin of the present application has excellent bonding properties to the nylon layer, the PET layer and the PE layer, and can obtain a high-barrier film structure with PET as the printing layer and PE as the heat-sealing layer, thereby solving the problem that PE as the printing layer is easy to de-ink and PA as the printing layer is high in cost.
[0028] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0030] FIG1 is a DSC graph of the adhesive resin provided in Example 1 of the present application;
[0031] FIG2 is an infrared spectrum of the adhesive resin provided in Example 1 of the present application. DETAILED DESCRIPTION
[0032] The technical scheme of the present application will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of the present application's embodiments, rather than all of the embodiments, and are only used to illustrate the present application, and should not be considered as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present application. Those who do not specify specific conditions in the embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Those whose reagents or instruments are not specified as manufacturers are conventional products that can be purchased commercially.
[0033] Existing adhesive resins have poor adhesion to PE and PET. Furthermore, existing printing layers are primarily composed of PE and PA. PE is prone to ink decolorization, while PA is expensive to use as a printing layer. Consequently, existing barrier film structures either use a PE layer as the printing layer, which is prone to decolorization and poor adhesion, or a PA layer as the printing layer, which leads to high costs.
[0034] In a first aspect, the present application provides an adhesive resin for a multi-layer co-extruded high-barrier film, which comprises the following components in parts by weight:
[0035] 20-40 parts of graft modified polyethylene, 20-30 parts of styrene block copolymer, 20-40 parts of polyethylene and 20-30 parts of ethylene-butylene elastomer;
[0036] In the ethylene-butene elastomer, the content of butene as the comonomer is 10% to 30%.
[0037] The adhesive resin for multi-layer co-extruded high-barrier films disclosed herein is formulated by graft-modifying polyethylene, a styrene block copolymer, polyethylene, and an ethylene-butylene elastomer, resulting in excellent bonding properties. Research has also shown that the use of an ethylene-butylene elastomer enhances the adhesive resin's adhesion to PET. However, using conventional POE instead of an ethylene-butylene elastomer results in insufficient adhesion to PET, failing to meet barrier film application requirements.
[0038] For example, in different embodiments, the amounts of the components in the adhesive resin for the multi-layer co-extruded high barrier film may be as follows, calculated by weight:
[0039] The amount of graft modified polyethylene can be 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts or a range consisting of any two thereof;
[0040] The amount of the styrene block copolymer can be 20 parts, 22 parts, 25 parts, 28 parts, 30 parts or a range consisting of any two thereof;
[0041] The amount of polyethylene can be 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts or a range consisting of any two thereof;
[0042] The amount of the ethylene-butylene elastomer can be 20 parts, 22 parts, 25 parts, 28 parts, 30 parts or a range consisting of any two of them.
[0043] For example, in various embodiments, the butene content of the ethylene-butene elastomer can be 10%, 15%, 20%, 25%, 30%, or any combination thereof. By regulating the butene content of the ethylene-butene elastomer within the aforementioned range, adhesion to PET, PA, and PE can be maintained.
[0044] In a specific embodiment of the present application, the adhesive resin for the multi-layer co-extruded high barrier film includes the following components in parts by weight:
[0045] 25-30 parts of graft modified polyethylene, 20-25 parts of styrene block copolymer, 20-25 parts of polyethylene and 25-30 parts of ethylene-butylene elastomer.
[0046] In a specific embodiment of the present application, the mass ratio of the styrene block copolymer to the ethylene-butylene elastomer is 1:(0.8-1.25).
[0047] For example, in different embodiments, the mass ratio of the styrene block copolymer to the ethylene-butylene elastomer can be 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.25, or a range consisting of any two thereof.
[0048] In a specific embodiment of the present application, the adhesive resin has a melt index of 1 to 6 g / 10 min at 190° C. and 2.16 kg.
[0049] For example, in different embodiments, the melt index of the adhesive resin at 190°C and 2.16 kg can be 1 g / 10 min, 2 g / 10 min, 3 g / 10 min, 4 g / 10 min, 5 g / 10 min, 6 g / 10 min, or a range consisting of any two thereof. By adjusting the amounts of each component, while taking into account the adhesive properties of the adhesive resin to different substrates, the melt index of the adhesive resin can be ensured within the above range to ensure processing performance.
[0050] In a specific embodiment of the present application, the melt index of the ethylene-butene elastomer at 190°C and 2.16 kg is 0.5 to 7 g / 10 min. Furthermore, the density of the ethylene-butene elastomer is 0.85 to 0.91 g / cm 3 .
[0051] For example, in different embodiments, the melt index of the ethylene-butene elastomer at 190°C and 2.16 kg can be 0.5 g / 10 min, 1 g / 10 min, 1.5 g / 10 min, 2 g / 10 min, 3 g / 10 min, 4 g / 10 min, 5 g / 10 min, 6 g / 10 min, 7 g / 10 min or a range consisting of any two of them, preferably 1.5 to 2.5 g / 10 min.
[0052] For example, in different embodiments, the density of the ethylene-butylene elastomer can be 0.85 g / cm 3 , 0.86g / cm 3 , 0.87g / cm 3 、0.88g / cm 3 , 0.89g / cm 3 , 0.9g / cm 3 , 0.91g / cm 3 Or the range of any two of them, preferably 0.88 to 0.9 g / cm 3 .
[0053] In a specific embodiment of the present application, in the graft-modified polyethylene, the grafting agent is maleic anhydride, and the grafting rate is 0.6% to 1.2%. Furthermore, the graft-modified polyethylene is a graft-modified linear low-density polyethylene.
[0054] For example, in different embodiments, in the graft-modified polyethylene, the grafting rate can be 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.2% or a range consisting of any two thereof.
[0055] In a specific embodiment of the present application, the melt index of the grafted modified polyethylene at 190°C and 2.16 kg is 1 to 4 g / 10 min. Furthermore, the density of the grafted modified polyethylene is 0.9 to 0.95 g / cm 3 .
[0056] For example, in different embodiments, the melt index of the grafted modified polyethylene at 190°C and 2.16 kg can be 1 g / 10 min, 2 g / 10 min, 3 g / 10 min, 4 g / 10 min, or a range consisting of any two thereof, and the density can be 0.9 g / cm 3 , 0.91g / cm 3 , 0.92g / cm 3 , 0.93g / cm 3 、0.94g / cm 3 , 0.95g / cm 3 Or a range consisting of any two of them.
[0057] In a specific embodiment of the present application, the styrene block copolymer is a hydrogenated styrene-butadiene block copolymer (SEBS).
[0058] In a specific embodiment of the present application, the melt index of the styrene block copolymer at 190°C and 2.16 kg is 1 to 40 g / 10 min. Furthermore, the density of the styrene block copolymer is 0.8 to 1.2 g / cm 3 .
[0059] For example, in different embodiments, the melt index of the styrene block copolymer at 190° C. and 2.16 kg can be 1 g / 10 min, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, or a range consisting of any two thereof, and the density can be 0.8 g / cm 3 , 0.9g / cm 3 , 1g / cm 3 , 1.1g / cm 3 , 1.2g / cm 3 Or a range consisting of any two of them.
[0060] In a specific embodiment of the present application, the polyethylene is a linear low-density polyethylene. Furthermore, the polyethylene has a melt index of 1 to 4 g / 10 min at 190°C and 2.16 kg; and a density of 0.9 to 0.95 g / cm 3 .
[0061] For example, in different embodiments, the melt index of polyethylene at 190°C and 2.16 kg can be 1 g / 10 min, 2 g / 10 min, 3 g / 10 min, 4 g / 10 min, or a range consisting of any two thereof, and the density can be 0.9 g / cm 3 , 0.91g / cm 3 , 0.92g / cm 3 , 0.93g / cm 3 、0.94g / cm 3 , 0.95g / cm 3 Or a range consisting of any two of them.
[0062] In a second aspect, the present application provides a method for preparing any one of the above-mentioned adhesive resins, comprising the following steps:
[0063] The components are mixed in proportion and melt-extruded to form granules.
[0064] The melt extrusion can be carried out using a conventional twin-screw extruder. Furthermore, the temperature settings of each temperature zone and die head can be: 150°C, 170°C, 210°C, 220°C or 190°C.
[0065] In a third aspect, the present application provides a high barrier film structure, comprising a heat seal layer, a first adhesive layer, a barrier layer, a second adhesive layer and a printing layer arranged in sequence; the first adhesive layer and / or the second adhesive layer is made of any of the above-mentioned adhesive resins;
[0066] The barrier layer is a nylon layer, the heat sealing layer is a PE layer, and the printing layer is a PET layer.
[0067] The adhesive resin of the present application can ensure excellent bonding performance to PET, PA and PE substrates through the compounding of components and dosage. The adhesive resin of the present application can be used to produce a PET / PA / PE-based multi-layer co-extruded high-barrier film structure, which not only takes into account the bonding performance and meets the requirements of high-barrier films, but also uses PET as the printing layer, has strong ink adhesion, and is low in cost.
[0068] In a specific embodiment of the present application, the total weight of the first adhesive layer and the second adhesive layer is 8% to 20% of the weight of the high barrier film structure.
[0069] For example, in different embodiments, the sum of the weight of the first adhesive layer and the second adhesive layer may be 8%, 10%, 12%, 15%, 18%, 20% or any two thereof of the weight of the high barrier film structure.
[0070] The elongation at break of the adhesive resin of the present application may be ≥680%, such as ≥700%, ≥700%, ≥720%, ≥750%, ≥760%, ≥780%, ≥800%, etc. At the same time, the peel strength of the high-barrier film structure obtained may be ≥4.5N / 15mm, such as ≥4.8N / 15mm, ≥5N / 15mm, ≥5.2N / 15mm, ≥5.5N / 15mm, ≥6N / 15mm, ≥6.2N / 15mm, ≥6.3N / 15mm, etc.
[0071] Example 1
[0072] This embodiment provides an adhesive resin for a multi-layer co-extruded high-barrier film, comprising the following components in parts by weight:
[0073] 30 parts of graft modified polyethylene, 20 parts of styrene block copolymer, 25 parts of polyethylene and 25 parts of ethylene-butylene elastomer;
[0074] The grafted modified polyethylene is maleic anhydride grafted modified linear low-density polyethylene, with a maleic anhydride grafting rate of 0.6%, a melt index of 1.2g / 10min, and a density of 0.92g / cm 3 ;
[0075] The styrene block copolymer is SEBS, with a melt index of 5g / 10min and a density of 0.9g / cm 3 ;
[0076] The polyethylene is linear low-density polyethylene with a melt index of 2g / 10min and a density of 0.92g / cm 3 ;
[0077] Ethylene-butene elastomer is an ethylene-butene copolymer with a melt index of 2g / 10min and a density of 0.89g / cm 3 , the content of comonomer butene is 15%.
[0078] A method for preparing an adhesive resin for a multi-layer co-extruded high-barrier film comprises the following steps:
[0079] After mixing according to the raw material ratio, the mixture is added to a twin-screw extruder for melt extrusion and granulation, and then dried to obtain adhesive resin pellets; wherein, during the melt extrusion, the temperature zones of the twin-screw extruder are set to: zone I 150°C, zone II 170°C, zone III 210°C, zone IV 220°C, and die head 190°C.
[0080] The DSC curve and infrared spectrum of the prepared adhesive resin are shown in Figures 1 and 2, respectively.
[0081] Example 2
[0082] This embodiment refers to the adhesive resin for multi-layer co-extruded high barrier film and its preparation method of Example 1, with the only difference being that the ethylene-butene elastomer is different.
[0083] The ethylene-butene elastomer in this embodiment is an ethylene-butene copolymer with a melt index of 3 g / 10 min and a density of 0.88 g / cm 3 , the content of comonomer butene is 10%.
[0084] Example 3
[0085] This embodiment refers to the adhesive resin for multi-layer co-extruded high barrier film and its preparation method of Example 1, with the only difference being that the ethylene-butene elastomer is different.
[0086] The ethylene-butene elastomer in this embodiment is an ethylene-butene copolymer with a melt index of 5 g / 10 min and a density of 0.86 g / cm 3 , the content of comonomer butene is 30%.
[0087] Example 4
[0088] This embodiment refers to the adhesive resin for multi-layer co-extruded high barrier film and its preparation method of Example 1, with the only difference being that the ethylene-butene elastomer is different.
[0089] The ethylene-butene elastomer in this embodiment is an ethylene-butene copolymer with a melt index of 15 g / 10 min and a density of 0.87 g / cm 3 , the content of comonomer butene is 15%.
[0090] Example 5
[0091] This embodiment refers to the adhesive resin for multi-layer co-extruded high barrier film and its preparation method of Example 1, with the only difference being that the grafted modified polyethylene is different.
[0092] The grafted modified polyethylene in this embodiment is maleic anhydride grafted modified linear low-density polyethylene, with a maleic anhydride grafting rate of 1%, a melt index of 1.8 g / 10 min, and a density of 0.92 g / cm 3 .
[0093] Example 6
[0094] This embodiment refers to the adhesive resin for multi-layer co-extruded high barrier film and the preparation method thereof of Example 1, with the only difference being that the amounts of the components used are different.
[0095] The adhesive resin for the multi-layer co-extruded high-barrier film of this embodiment includes the following components in parts by weight: 25 parts of grafted modified polyethylene, 25 parts of styrene block copolymer, 20 parts of polyethylene, and 30 parts of ethylene-butylene elastomer.
[0096] Example 7
[0097] This embodiment refers to the adhesive resin for multi-layer co-extruded high barrier film and the preparation method thereof of Example 1, with the only difference being that the amounts of the components used are different.
[0098] The adhesive resin for the multi-layer co-extruded high-barrier film of this embodiment includes the following components in parts by weight: 30 parts of grafted modified polyethylene, 25 parts of styrene block copolymer, 25 parts of polyethylene, and 20 parts of ethylene-butylene elastomer.
[0099] Examples 8 to 14
[0100] Examples 8 to 14 provide multi-layer co-extruded high-barrier film structures, comprising a heat-seal layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a printed layer, arranged in sequence. The first and second adhesive layers bond both sides of the barrier layer to one side of the heat-seal layer and the printed layer, respectively. The barrier layer is a PA layer, the heat-seal layer is a PE layer, and the printed layer is a PET layer. The combined weight of the first and second adhesive layers constitutes 15% of the total weight of the high-barrier film structure.
[0101] A multi-layer co-extruded high-barrier film structure was prepared by co-extrusion casting process with a molding speed of 10m / min. The thicknesses of the 5-layer structure were: PE heat sealing layer 25μm, first adhesive layer 15μm, PA barrier layer 20μm, second adhesive layer 15μm and PET printing layer 25μm.
[0102] The first and second adhesive layers in Examples 8 to 14 are made of the adhesive resins in Examples 1 to 7, respectively.
[0103] Comparative Example 1
[0104] Comparative Example 1 refers to the adhesive resin for the multi-layer co-extruded high barrier film and the preparation method thereof of Example 1, except that the grafted modified polyethylene is different.
[0105] The grafted modified polyethylene of Comparative Example 1 is acrylic acid grafted modified linear low-density polyethylene, with an acrylic acid grafting rate of 0.6%, a melt index of 1.8 g / 10 min, and a density of 0.92 g / cm 3 .
[0106] Comparative Example 2
[0107] Comparative Example 2 refers to the adhesive resin for the multi-layer co-extruded high barrier film and the preparation method thereof of Example 1, except that the ethylene-butene elastomer is different.
[0108] The ethylene-butene elastomer of Comparative Example 2 is an ethylene-butene copolymer with a melt index of 5 g / 10 min and a density of 0.89 g / cm 3 , the content of comonomer butene is 8%.
[0109] Comparative Example 3
[0110] Comparative Example 3 refers to the adhesive resin for the multi-layer co-extruded high barrier film and the preparation method thereof of Example 1, except that the ethylene-butene elastomer is different.
[0111] The ethylene-butene elastomer of Comparative Example 3 is an ethylene-butene copolymer with a melt index of 6 g / 10 min and a density of 0.84 g / cm 3 , the content of comonomer butene is 50%.
[0112] Comparative Example 4
[0113] Comparative Example 4 refers to the adhesive resin for the multi-layer co-extruded high barrier film and the preparation method thereof of Example 1, except that an equal weight of ethylene-hexene elastomer is used to replace the ethylene-butene elastomer.
[0114] The ethylene-hexene elastomer of Comparative Example 4 is an ethylene-hexene copolymer with a melt index of 5 g / 10 min and a density of 0.86 g / cm 3 , the content of comonomer hexene is 20%.
[0115] Comparative Example 5
[0116] Comparative Example 5 refers to the adhesive resin for the multi-layer co-extruded high barrier film and the preparation method thereof of Example 1, except that an equal weight of ethylene-octene elastomer is used to replace the ethylene-butene elastomer.
[0117] The ethylene-octene elastomer of Comparative Example 5 is an ethylene-octene copolymer with a melt index of 3.5 g / 10 min and a density of 0.86 g / cm 3 , the content of comonomer octene is 20%.
[0118] Comparative Examples 6 to 10
[0119] Comparative Examples 6 to 10 refer to the multi-layer co-extruded high barrier film structure and preparation method thereof of Example 8, except that different adhesive resins are used to prepare the first adhesive layer and the second adhesive layer.
[0120] The adhesive resin used in the first adhesive layer and the second adhesive layer in the structure of Comparative Example 6 is the adhesive resin in Comparative Example 1;
[0121] The adhesive resin used in the first adhesive layer and the second adhesive layer in the structure of Comparative Example 7 is the adhesive resin in Comparative Example 2;
[0122] The adhesive resin used in the first adhesive layer and the second adhesive layer in the structure of Comparative Example 8 is the adhesive resin in Comparative Example 3;
[0123] The adhesive resin used in the first adhesive layer and the second adhesive layer in the structure of Comparative Example 9 is the adhesive resin in Comparative Example 4;
[0124] The adhesive resin used in the first adhesive layer and the second adhesive layer in the structure of Comparative Example 10 is the adhesive resin in Comparative Example 5.
[0125] Experimental Example 1
[0126] The melt index and elongation at break of the adhesive resins of Examples 1 to 7 and Comparative Examples 1 to 5 were tested respectively, and the peel strength of the barrier film structures prepared according to Examples 8 to 16 and Comparative Examples 6 to 10 were tested respectively. The test results are shown in Table 1.
[0127] Table 1 Test results of different embodiments and comparative examples
[0128] From the above test results, it can be seen that the adhesive resin of the present application has excellent bonding properties through the combination of various components, and has high, long-lasting and stable bonding strength with specific barrier layers, printing layers and heat-sealing layers; at the same time, the combination of various components can enhance the toughness of the material and improve the overall mechanical properties of the material.
[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An adhesive resin for a multi-layer co-extruded high barrier film, comprising the following components in parts by weight: 20-40 parts of graft modified polyethylene, 20-30 parts of styrene block copolymer, 20-40 parts of polyethylene and 20-30 parts of ethylene-butene elastomer; in the ethylene-butene elastomer, the content of comonomer butene is 10%-30%.
2. The adhesive resin for a multi-layer co-extruded high barrier film according to claim 1, wherein: The invention comprises the following components in parts by weight: 25-30 parts of graft modified polyethylene, 20-25 parts of styrene block copolymer, 20-25 parts of polyethylene and 25-30 parts of ethylene-butylene elastomer.
3. The adhesive resin for a multi-layer co-extruded high barrier film according to claim 1, wherein: The adhesive resin has a melt index of 1 to 6 g / 10 min at 190° C. and 2.16 kg.
4. The adhesive resin for a multi-layer co-extruded high barrier film according to claim 1, wherein: The ethylene-butene elastomer has a melt index of 0.5 to 7 g / 10 min at 190° C. and 2.16 kg; Preferably, the density of the ethylene-butene elastomer is 0.85 to 0.91 g / cm 3 .
5. The adhesive resin for a multi-layer co-extruded high barrier film according to claim 1, wherein: In the graft-modified polyethylene, the grafting agent is maleic anhydride, and the grafting rate is 0.6% to 1.2%; Preferably, the graft-modified polyethylene is a graft-modified linear low-density polyethylene; Preferably, the graft modified polyethylene has a melt index of 1 to 4 g / 10 min at 190° C. and 2.16 kg; Preferably, the density of the grafted modified polyethylene is 0.9 to 0.95 g / cm 3 .
6. The adhesive resin for a multi-layer co-extruded high barrier film according to claim 1, wherein: The styrene block copolymer is a hydrogenated styrene-butadiene block copolymer; Preferably, the styrene block copolymer has a melt index of 1 to 40 g / 10 min at 190° C. and 2.16 kg; Preferably, the density of the styrene block copolymer is 0.8 to 1.2 g / cm 3 .
7. The adhesive resin for a multi-layer co-extruded high barrier film according to claim 1, wherein: The polyethylene is linear low-density polyethylene; Preferably, the polyethylene has a melt index of 1 to 4 g / 10 min at 190°C and 2.16 kg; and a density of 0.9 to 0.95 g / cm 3 .
8. The method for preparing the adhesive resin for a multi-layer co-extruded high-barrier film according to any one of claims 1 to 7, comprising: The components are mixed in proportion and melt-extruded to form granules.
9. A high-barrier film structure comprising a heat-sealing layer, a first adhesive layer, a barrier layer, a second adhesive layer, and a printing layer arranged in sequence; the first adhesive layer and / or the second adhesive layer being made of the adhesive resin according to any one of claims 1 to 7; The barrier layer is a nylon layer, the heat sealing layer is a PE layer, and the printing layer is a PET layer.
10. The high barrier film structure according to claim 9, wherein: The total weight of the first adhesive layer and the second adhesive layer is 8% to 20% of the weight of the high barrier film structure.