CN111055567B - High-strength composite membrane based on PE and preparation method thereof - Google Patents

High-strength composite membrane based on PE and preparation method thereof Download PDF

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CN111055567B
CN111055567B CN202010000376.8A CN202010000376A CN111055567B CN 111055567 B CN111055567 B CN 111055567B CN 202010000376 A CN202010000376 A CN 202010000376A CN 111055567 B CN111055567 B CN 111055567B
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tear strength
elmendorf tear
layer
notched elmendorf
notched
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CN111055567A (en
Inventor
丁海
袁凯红
刘刚
张庆
张宁
花少震
李峰辉
郑泽宇
李发闯
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Hefei Jiuzhou Longteng Scientific And Technological Achievement Transformation Co ltd
Xuzhou Tianrun New Material Technology Co ltd
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Henan Institute of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant

Abstract

The invention discloses a high-strength composite film based on PE, which sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notch Elmendorf tearing strength, the first SBS layer has a second notch Elmendorf tearing strength, the first thermoplastic TPU layer has a third notch Elmendorf tearing strength, the first SEBS layer has a fourth notch Elmendorf tearing strength, the first LDPE layer has a fifth notch Elmendorf tearing strength, the second SBS layer has a sixth notch Elmendorf tearing strength, the second thermoplastic TPU layer has a seventh notch Elmendorf tearing strength, the second SEBS layer has an eighth notch Elmendorf tearing strength and the second HDPE layer has a ninth notch Elmendorf tearing strength, wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value.

Description

High-strength composite membrane based on PE and preparation method thereof
Technical Field
The invention relates to the technical field of plastic films, in particular to a high-strength composite film based on PE and a preparation method thereof.
Background
Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. In industry, copolymers of ethylene with small amounts of alpha-olefins are also included.
Prior art CN107454870B discloses a split-layer thermoplastic film 20 having the structure A- (B-C) n-B-A, wherein A and C are inelastic layers 22, 26 each having a thickness and each independently comprising at least one polymer composition A and C; b24 is an elastic layer comprising a polymer composition B, n.gtoreq.1, and wherein: the (B-C) n-B containing layers 26, 24 have a combined thickness x, and polymer compositions A and C comprise an inelastic polymer; polymer composition B comprises an elastomeric polymer; and wherein the thickness of C comprises less than or equal to 5% of the total thickness of the film 20, and further wherein the notched elmendorf tear strength of the film 20 is at least 2 times greater than the notched elmendorf tear strength of a comparative thermoplastic film having the structure a-B-a, wherein a and B comprise substantially the same polymer compositions a and B as the thermoplastic film, and wherein the thickness y of the B layer in the comparative thermoplastic film is substantially equal to x.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The object of the present invention is to provide a high strength composite film based on PE which overcomes the drawbacks of the prior art.
To achieve the above objects, the present invention provides a high strength composite film based on PE, which comprises, in order from the inside to the outside, a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer, and a second HDPE layer, wherein the first HDPE layer has a first notched elmendorf tear strength, the first SBS layer has a second notched elmendorf tear strength, the first thermoplastic TPU layer has a third notched elmendorf tear strength, the first SEBS layer has a fourth notched elmendorf tear strength, the first LDPE layer has a fifth notched elmendorf tear strength, the second SBS layer has a sixth notched elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched elmendorf tear strength, the second SEBS layer has an eighth notched elmendorf tear strength, and the second HDPE layer has a ninth notched elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value.
In a preferred embodiment, the first notched Elmendorf tear strength is 130% to 150% of the second notched Elmendorf tear strength.
In a preferred embodiment, the third notched elmendorf tear strength is 140% to 160% of the second notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the first notched elmendorf tear strength.
In a preferred embodiment, the fourth notched Elmendorf tear strength is 110% to 130% of the third notched Elmendorf tear strength.
In a preferred embodiment, the fourth notched Elmendorf tear strength is 120-.
In a preferred embodiment, the fifth notched Elmendorf tear strength is 80% to 90% of the sixth notched Elmendorf tear strength.
In a preferred embodiment, the sixth notched elmendorf tear strength is 80% to 90% of the seventh notched elmendorf tear strength.
In a preferred embodiment, the seventh notched Elmendorf tear strength is 80% to 90% of the eighth notched Elmendorf tear strength.
In a preferred embodiment, the eighth notched elmendorf tear strength is 80% to 90% of the ninth notched elmendorf tear strength.
The invention provides a preparation method of a high-strength composite film based on PE, which is characterized by comprising the following steps: the preparation method of the PE-based high-strength composite membrane comprises the following steps: a high-strength composite film based on PE is formed by a coextrusion process, wherein the high-strength composite film based on PE sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second Ehrlss layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value.
Compared with the prior art, the invention has the following advantages:
PE is a common polymer material, and plastic bags used in daily life are basically made of the PE material, although the PE material is wide in source, low in price and stable in performance. However, it is known that the mechanical properties of the ordinary PE film are poor, and in some occasions requiring high mechanical properties, the ordinary PE film or the ordinary multilayer PE composite film cannot meet the requirements of high mechanical properties. In order to solve the technical problem, many solutions are proposed in the prior art, and documents mentioned in the background art introduce a technical solution, the core of the prior art is to increase the tear strength of the PE film by adding a film layer (i.e. a BCBC structure) with periodic regular repetition in the middle of the PE film layer, and meanwhile, the prior art also finds that the larger the film layer thickness is, the better the film layer thickness is, the larger the elastic film layer thickness is, which may also cause the tear strength of the material to decrease. The prior art provides a good idea for solving the problem of poor mechanical property of the PE film layer, but the prior art also has the following problems: while it is recognized that the addition of an elastic layer can improve film layer performance, this prior art insists on recognizing that a symmetrical structure is required for the film layer, while this prior art recognizes that elastic layer thickness is the most important or even the only factor affecting tear strength. Through research of the inventor of the application, the symmetric structure of the film layer is not beneficial to increasing the mechanical property of the film layer, and the specific asymmetric structure of the film layer (rather than any random asymmetric structure) can increase the performance of the film layer more obviously; furthermore, the inventors have found that the effect of the properties of the film layers is not a choice of film layer thickness, but rather a combination of tear strengths between the individual film layers.
Drawings
Fig. 1 is a schematic structural view of a PE-based high strength composite film according to an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Fig. 1 is a schematic structural view of a PE-based high strength composite film according to an embodiment of the present invention. As shown in the figure, the PE-based high strength composite film of the present invention comprises, in order from the inside to the outside, a first HDPE layer 101, a first SBS layer 102, a first thermoplastic TPU layer 103, a first SEBS layer 104, a first LDPE layer 105, a second SBS layer 106, a second thermoplastic TPU layer 107, a second SEBS layer 108, and a second HDPE layer 109. The preparation method of the PE-based high-strength composite film is a coextrusion process (see CN107454870B for example) which is well known in the art, and the specific process parameters are parameters which are well known in the art and are not described in detail in the application. The elmendorf tear strength can be adjusted by adjusting the molecular weight of the material, by adjusting the layer thickness, or by mixing the two methods.
Example 1
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value. The first notched elmendorf tear strength is 130% of the second notched elmendorf tear strength. The third notched Elmendorf tear strength is 140% of the second notched Elmendorf tear strength. The fourth notched Elmendorf tear strength is 110% of the third notched Elmendorf tear strength. The fourth notched Elmendorf tear strength is 120% of the fifth notched Elmendorf tear strength. The fifth notched Elmendorf tear strength is 80% of the sixth notched Elmendorf tear strength. The sixth notched Elmendorf tear strength is 80% of the seventh notched Elmendorf tear strength. The seventh notched Elmendorf tear strength is 80% of the eighth notched Elmendorf tear strength. The eighth notched Elmendorf tear strength is 80% of the ninth notched Elmendorf tear strength.
Example 2
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value. The first notched elmendorf tear strength is 150% of the second notched elmendorf tear strength. The third notched elmendorf tear strength is 160% of the second notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the first notched elmendorf tear strength. The fourth notched Elmendorf tear strength is 130% of the third notched Elmendorf tear strength. The fourth notched elmendorf tear strength is 140% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength. The fifth notched Elmendorf tear strength is 90% of the sixth notched Elmendorf tear strength. The sixth notched Elmendorf tear strength is 90% of the seventh notched Elmendorf tear strength. The seventh notched Elmendorf tear strength is 90% of the eighth notched Elmendorf tear strength. The eighth notched Elmendorf tear strength is 90% of the ninth notched Elmendorf tear strength.
Example 3
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value. The first notched elmendorf tear strength is 140% of the second notched elmendorf tear strength. The third notched elmendorf tear strength is 150% of the second notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the first notched elmendorf tear strength. The fourth notched Elmendorf tear strength is 120% of the third notched Elmendorf tear strength. A fourth notched elmendorf tear strength is 130% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength. The fifth notched Elmendorf tear strength is 85% of the sixth notched Elmendorf tear strength. The sixth notched Elmendorf tear strength is 85% of the seventh notched Elmendorf tear strength. The seventh notched Elmendorf tear strength is 85% of the eighth notched Elmendorf tear strength. The eighth notched elmendorf tear strength is 85% of the ninth notched elmendorf tear strength.
Comparative example 1
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value. The first notched elmendorf tear strength is 160% of the second notched elmendorf tear strength. The third notched elmendorf tear strength is 170% of the second notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the first notched elmendorf tear strength. The fourth notched Elmendorf tear strength is 120% of the third notched Elmendorf tear strength. A fourth notched elmendorf tear strength is 130% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength. The fifth notched Elmendorf tear strength is 85% of the sixth notched Elmendorf tear strength. The sixth notched Elmendorf tear strength is 85% of the seventh notched Elmendorf tear strength. The seventh notched Elmendorf tear strength is 85% of the eighth notched Elmendorf tear strength. The eighth notched elmendorf tear strength is 85% of the ninth notched elmendorf tear strength.
Comparative example 2
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value. The first notched elmendorf tear strength is 140% of the second notched elmendorf tear strength. The third notched elmendorf tear strength is 150% of the second notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the first notched elmendorf tear strength. The fourth notched Elmendorf tear strength is 140% of the third notched Elmendorf tear strength. A fourth notched elmendorf tear strength is 150% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength. The fifth notched Elmendorf tear strength is 85% of the sixth notched Elmendorf tear strength. The sixth notched Elmendorf tear strength is 85% of the seventh notched Elmendorf tear strength. The seventh notched Elmendorf tear strength is 85% of the eighth notched Elmendorf tear strength. The eighth notched elmendorf tear strength is 85% of the ninth notched elmendorf tear strength.
Comparative example 3
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value. The first notched elmendorf tear strength is 140% of the second notched elmendorf tear strength. The third notched elmendorf tear strength is 150% of the second notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the first notched elmendorf tear strength. The fourth notched Elmendorf tear strength is 120% of the third notched Elmendorf tear strength. A fourth notched elmendorf tear strength is 130% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength. The fifth notched Elmendorf tear strength is 100% of the sixth notched Elmendorf tear strength. The sixth notched Elmendorf tear strength is 100% of the seventh notched Elmendorf tear strength. The seventh notched Elmendorf tear strength is 85% of the eighth notched Elmendorf tear strength. The eighth notched elmendorf tear strength is 85% of the ninth notched elmendorf tear strength.
Comparative example 4
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value. The first notched elmendorf tear strength is 140% of the second notched elmendorf tear strength. The third notched elmendorf tear strength is 150% of the second notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the first notched elmendorf tear strength. The fourth notched Elmendorf tear strength is 120% of the third notched Elmendorf tear strength. A fourth notched elmendorf tear strength is 130% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength. The fifth notched Elmendorf tear strength is 85% of the sixth notched Elmendorf tear strength. The sixth notched Elmendorf tear strength is 85% of the seventh notched Elmendorf tear strength. The seventh notched Elmendorf tear strength is 100% of the eighth notched Elmendorf tear strength. The eighth notched Elmendorf tear strength is 100% of the ninth notched Elmendorf tear strength.
Comparative example 5
The PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer and a second HDPE layer from inside to outside. The notched Elmendorf tear strength of each layer was the same as that set forth in example 3.
Comparative example 6
The sample represented in the second row of table 2 of the documents mentioned in the background art.
Examples 1 to 3 and comparative examples 1 to 6 were subjected to the MD notched tear strength test and the CD notched tear strength test, the test methods being referred to the methods described in CN107454870B in order to ensure comparability of the results. In addition, in order to avoid other misunderstandings caused by different experimental results made at different times, places and environments, the experimental results of the present application are normalized according to embodiment 1.
TABLE 1
Figure BDA0002352923640000111
Figure BDA0002352923640000121
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (2)

1. A PE-based high-strength composite film is characterized in that: the PE-based high-strength composite film sequentially comprises a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer and a second HDPE layer from inside to outside, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value;
and wherein said first notched Elmendorf tear strength is 130% -150% of said second notched Elmendorf tear strength; said third notched Elmendorf tear strength is 140% -160% of said second notched Elmendorf tear strength, and wherein said third notched Elmendorf tear strength is greater than said first notched Elmendorf tear strength; said fourth notched elmendorf tear strength is 110% to 130% of said third notched elmendorf tear strength; the fourth notched elmendorf tear strength is 120-140% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength; said fifth notched elmendorf tear strength is 80% -90% of said sixth notched elmendorf tear strength; said sixth notched elmendorf tear strength is 80% -90% of said seventh notched elmendorf tear strength; said seventh notched elmendorf tear strength is 80% -90% of said eighth notched elmendorf tear strength; the eighth notched elmendorf tear strength is 80% -90% of the ninth notched elmendorf tear strength.
2. A preparation method of a high-strength composite film based on PE is characterized by comprising the following steps: the preparation method of the PE-based high-strength composite membrane comprises the following steps: forming the PE-based high strength composite film using a coextrusion process, wherein the PE-based high strength composite film comprises, in order from inside to outside, a first HDPE layer, a first SBS layer, a first thermoplastic TPU layer, a first SEBS layer, a first LDPE layer, a second SBS layer, a second thermoplastic TPU layer, a second SEBS layer, and a second HDPE layer, wherein the first HDPE layer has a first notched Elmendorf tear strength, the first SBS layer has a second notched Elmendorf tear strength, the first thermoplastic TPU layer has a third notched Elmendorf tear strength, the first SEBS layer has a fourth notched Elmendorf tear strength, the first LDPE layer has a fifth notched Elmendorf tear strength, the second SBS layer has a sixth notched Elmendorf tear strength, the second thermoplastic TPU layer has a seventh notched Elmendorf tear strength, the second SEBS layer has an eighth notched Elmendorf tear strength, and the second HDPE layer has a ninth notched Elmendorf tear strength, wherein the notched Elmendorf tear strength is measured according to ASTM D-1922, and wherein the first-ninth notched Elmendorf tear strengths each have a substantially different value;
and wherein said first notched Elmendorf tear strength is 130% -150% of said second notched Elmendorf tear strength; said third notched Elmendorf tear strength is 140% -160% of said second notched Elmendorf tear strength, and wherein said third notched Elmendorf tear strength is greater than said first notched Elmendorf tear strength; said fourth notched elmendorf tear strength is 110% to 130% of said third notched elmendorf tear strength; the fourth notched elmendorf tear strength is 120-140% of the fifth notched elmendorf tear strength, and wherein the third notched elmendorf tear strength is greater than the fifth notched elmendorf tear strength; said fifth notched elmendorf tear strength is 80% -90% of said sixth notched elmendorf tear strength; said sixth notched elmendorf tear strength is 80% -90% of said seventh notched elmendorf tear strength; said seventh notched elmendorf tear strength is 80% -90% of said eighth notched elmendorf tear strength; the eighth notched elmendorf tear strength is 80% -90% of the ninth notched elmendorf tear strength.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102448723A (en) * 2009-03-31 2012-05-09 陶氏环球技术有限责任公司 Collation shrinkage film having excellent clarity and superior toughness
CN107454870A (en) * 2015-01-09 2017-12-08 克罗佩塑料制品公司 Elastic membrane with increased tear resistance

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070237916A1 (en) * 2006-03-28 2007-10-11 Torben Rasmussen Multilayer film free of halogens which is impermeable to aroma compounds

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102448723A (en) * 2009-03-31 2012-05-09 陶氏环球技术有限责任公司 Collation shrinkage film having excellent clarity and superior toughness
CN107454870A (en) * 2015-01-09 2017-12-08 克罗佩塑料制品公司 Elastic membrane with increased tear resistance

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